Configuring ETRN on the Server and the Client Essay

To set up ETRN, you need to configure the server and the client separately. The ISP usually configures the server side. The setup is simple if your ISP is using Exchange Server. Go to the Connections tab of the IMS property sheet. Under Message delivery, click E-Mail Domain. Add the customer’s domain name and select the Queue messages for ETRN check box, as you see inScreen 1. If you don’t check this box, the ISP server will immediately attempt to deliver messages even though the ETRN client is offline. Checking this box prevents unsuccessful retries and nondelivery reports (NDRs) back to the originator. ISPs that don’t use Exchange Servers can configure the Sendmail utility for ETRN capability. The ETRN client requires more complex configuration. First, configure when the ETRN client sends mail. If you’re using RAS, be sure you’ve configured the RAS client and a phone book entry pointing to your ISP before you begin. From Exchange Server, go to the IMS property sheet to configure your connector for ETRN dial-up. From the Dial-up Connections tab, which Screen 2 shows, choose the appropriate remote access entry from the Available connections window. Next, decide on a schedule for calling your ISP. As Screen 2 shows, you have several options, including transferring mail at specific intervals or whenever mail is queued up. Note that you don’t explicitly define when to close the connection. The IMS terminates the connection depending on the setting in the Time-out after X min window. This parameter refers to idle time; the connection closes after the number of minutes you specify have passed. Your ISP must be able to dequeue your inbound mail within this period, or the connection will close prematurely. The connection might close if the dequeue process doesn’t proceed in a timely fashion after you’ve established the connection with the ISP. You can accommodate a slow start of the dequeuing process by increasing the time value. You configure logon validation for the dial-up connection by clicking Logon Information on the Dial-up Connectors tab. On the screen that opens, enter your username, password, and domain (if appropriate). This information (which your ISP gives you) provides the credentials for ETRN to match against the server and provides security between the two servers. To configure ETRN to let your ISP send your mail to you, click Mail Retrieval to get to the screen that you see in Screen 3. Click Retrieve mail using ETRN. To specify the proper Internet domain, you can use the Routing property page (from the IMS property sheet) or hard-code your domain names by selecting Use these domains and entering domains in the window. The latter option signals the ISP to dequeue messages from this domain only. If you’ve defined subdomains, precede the domain name with an at (@) character to collect mail for all domains. Subdomains let you partition companies into operating units with separate email addresses. For example, the NCR.com Internet domain has several subdomains, such as daytonoh.NCR.com and columbiasc.NCR.com. If your ISP has defined separate hosts for inbound and outbound messages, you can select Send ETRN to specified host instead of outbound mail host and define the IP address of the inbound host. If your service provider uses the TURN command instead of ETRN, you can click Issue TURN after delivering outbound mail. If you use this option, your ISP might need to authenticate your identity, if the ISP has this functionality. You can configure these credentials (e.g., name and password) on the Security tab of the IMS property sheet. This authentication usually uses the AUTH LOGIN ESMTP extension to send the account and password on the outbound connection. If your ISP uses UNIX instead of Exchange Server, you can use the UNIX Sendmail application to dequeue messages from the ISP’s SMTP gateway for delivery to the ETRN client. To configure Sendmail, select Custom command to invoke a script that uses the Sendmail function. You enter the script in the window next to the option. For instance, the remote shell command (Rsh) causes Sendmail to run at the service provider after you’ve established a connection. For example, the syntax  Rsh I isp.com l logonalias â€Å"/user/lib/sendmail q R NCR.com† starts the remote shell, then connects to a service provider called ISP.com. The logon alias starts the shell at the ISP (this alias must match the rhosts file on the ISP). The rest of the command executes the remote shell and sends the queue to the specified domain (NCR.com). The final step in the client portion of ETRN setup is to configure your server to queue mail in the IMS for later transfer to your ISP via ETRN. On the IMS Connections tab, which Screen 4 shows, selectForward all messages to host under Message Delivery, and then enter your ISP’s IP address. Check the Dial using check box, and be sure the correct RAS phone book entry appears in the adjacent window.

Hydraulic Machines

30 CHAPTER 5 TURBINES 5. 1 Introduction Hydraulic turbines are the machines which use the energy of water and convert it to mechanical energy. The mechanical energy developed by a turbine is used in running an electric generator which is directly coupled to the shaft of the turbine. The electric generator thus develops electric power, which is known as hydro-electric power. 5. 2 Elements of Hydraulic Power Plants Fig. 5. 1 General Layout of a Hydraulic Power Plant 31 Fig. 5. 1 shows a general layout of hydraulic power plant, in which an artificial storage reservoir formed by constructing a dam has been shown. 5. 3General Classification of Turbines Turbines are hydraulic machines that convert energy into rotating mechanical energy which in turn generators to produce electrical energy. Originally developed from the water wheels, hydraulic turbines are the prime mortars of importance in modern water power development. According to their hydraulic action, turbines are broadly divided int o two classes. (1) Impulse Turbine: Impulse turbines are more efficient for high heads. At the inlet to the turbine runner, pressure head can be completely converted into kinetic head in the form of a jet of water issuing from one or more nozzles.The free jet will be at atmospheric pressure before as well as after striking the vanes. The turbines are regulated by nozzles which may be a simple straight flow type or a deflector type. The impulse turbines are commonly represented by Pelton Wheels. Turgo turbine is also an impulse turbine but with different buckets, when compared with pelton. Turgo and cross flow turbines are relatively new developments in this class. The main advantages of these turbines are: †¢ They can be easily adopted to power variation with almost constant efficiency. †¢The penstock overpressure and the runner overspeed control are easier. †¢ The turbine enables an easier maintenance. †¢ Due to the jet the manufacturer of these turbines impose a better solid particle control, conducting, consequently, to a lower abrasion effect. (2) Reaction Turbine: A turbine can be made to rotate under the action of water flowing under pressure through the runner. In such turbines the penstocks, the inlet passage to the runner, passage between the runner vanes, all form a continuous passage for the flow under a pressure which continuously decreases from inlet to outlet.The turbine runner directly converts both kinetic energy as well as the pressure energy into mechanical energy. Reaction turbines are represented in modern practice by two principal types: the Francis turbine where the flow is directed radial to the runner axis and the Propeller type 32 where the flow is axial to the runner axis. Propeller turbines may be fixed blade or adjustable blade types. Kaplan turbine has adjustable blades. The main advantages of these turbines are: †¢ It needs lesser installation space. †¢ It provides a greater net head and a better prot ection against downstream high flood levels. It can have greater runner speed. †¢ It can attain greater efficiencies for high power values. In order to distinguish different turbines, the hydraulically salient features like pressure, head, flow direction and magnitude, speed and power etc. The general classification of hydraulic turbines is illustrated in Fig. 5. 2. Hydraulic Turbines Impulse Turbines Pelton Turgo Reaction Turbines Cross-Flow Fixed -Blade Propeller Kaplan Francis Tubular Deriaz Bulb Fig. 5. 2 General Classification of Turbines 5. 4 Number of Units It is normally cost effective to have a minimum number of units at a given small ydropower installation. Multiple units may, however, be necessary from the operational point of view so that even one unit breaks down or is in the routine maintenance, the power generation can be achieved to a certain extent. The efficiency curves of turbines show that the 33 efficiency of power generation from hydraulic turbines conside rably decreases at low flow ratios or power ratios. In multiple units, it is possible to maintain the higher efficiency even in low flows and the low loads by running a certain number of the units at a time depending upon the available discharge and the load demand.Multiple units thus, make the most effective use of water where the flow as well as the load variations are significant. 5. 5 Limits of Use of Turbine Types The selection of best turbines for any particular small hydropower site depends on the site characteristics, the dominant beings the head and the available flow. There are some limits on the range of these parameters in the selection of turbines. Each turbine type is best suited to a certain range of pressure head and the flow rate. For instance, Pelton wheels operate with low flows discharged under great pressures where as Propeller turbines are effective in high flows under low heads.Francis turbines fall in the medium category covering a wide range of different hea ds and discharges. The common practice of SHP systems is to develop standard unit sizes of equipment that will operate over a range of heads and flows. Either charts or nomographs are used to select appropriate units for site specific application. One such chart showing the head-flow range of normal SHP schemes applicable to each type of turbine is given in Fig5. 3. The graph also indicates the approximate power generation for each combination of the head and the discharge applicable to SHP schemes. Fig. . 3 Head-Flow Ranges for Different Turbines 34 5. 6 Pelton Wheel Pelton wheel is well suited for operating under high heads. A pelton turbine has one or more nozzles discharging jets of water which strike a series of buckets mounted on the periphery of a circular disc. The runner consists of a circular disc with a number of buckets evenly spaced round its periphery. The buckets have a shape of a double semi-ellipsoidal cups. The pelton bucket is designed to deflect the jet back thro ugh 165 ° which is the maximum angle possible without the return jet interfering with the next bucket.Fig. 5. 4 Pelton bucket General arrangement of a pelton wheel is shown in the Fig. 5. 5. For SHP schemes, Pelton wheels are easier to fabricate and are relatively cheaper. The turbines are in general, not subjected to the cavitation effect. The turbines have access to working parts so that the maintenance or repairs can be effected in a shorter time. Fig. 5. 5 General Arrangement of a Pelton Wheel 35 Traditionally, micro hydro pelton wheels were always single jet because of the complexity and the cost of flow control governing of more than one jet.Advantages of multi-jet: -Higher rotational speed -Smaller runner -Less chance of blockage Disadvantages of multi-jet: -Possibility of jet interference on incorrectly designed systems -Complexity of manifolds 5. 7 Francis Turbine Francis turbine is a mixed flow type, in which water enters the runner radially at its outer periphery and le aves axially at its center. Fig. 5. 6 illustrates the Francis turbine. The runner blades are profiled in a complex manner and the casing is scrolled to distribute water around the entire perimeter of the runner.The water from the penstock enters a scroll case which completely surrounds the runner. The purpose of the scroll case is to provide an even distribution of water around the circumference of the turbine runner, maintaining an approximately constant velocity for the water so distributed. The function of guide vane is to regulate the quantity of water supplied to the runner and to direct water on to the runner at an angle appropriate design. A draft tube is a pipe or passage of gradually increasing cross sectional area which connects the runner exit to the tail race. Fig. 5. 6 Francis Turbine 36 . 8 Kaplan Turbine It is an axial flow turbine which is suitable for relatively low heads. From Fig. 5. 7, it will be seen that the main components of Kaplan turbine such as scroll casi ng, guide vanes, and the draft tube are similar to those of a Francis turbine. Fig. 5. 7 5. 9 Kaplan Turbine Specific Speed The specific speed of any turbine is the speed in r. p. m of a turbine geometrically similar to the actual turbine but of such a size that under corresponding conditions it will develop 1 metric horsepower when working under unit head. Ns = NP H5/ 4 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 1) where Ns = specific speedP = power in HP 5. 10 Characteristic Curves The turbines are generally designed to work at particular values of H,Q,P,N and ? o which are known as the designed conditions. It is essential to determine exact behaviour of the turbines under the varying conditions by carrying out tests either on the actual turbines or on their small scale models. The results of these tests are usually graphically represented and the resulting curves are known as characteristic curves. 37 -constant head characteristic curves -constant speed characteristic curves -constan t efficiency characteristic curvesIn order to obtain constant head characteristics curves the tests are performed on the turbine by maintaining a constant head and a constant gate opening and the speed is varied by changing the load on the turbine. A series of values of N are thus obtained and corresponding to each value of N, discharge Q and the output power P are measured. A series of such tests are performed by varying the gate opening, the head being maintained constant at the previous value. From the data of the tests the values of Qu, Pu, nu and ? o are computed for each gate opening. Then with Nu as abscissa the values ofQu, Pu and ? o for each gate opening are plotted. The curves thus obtained for pelton wheel and the reaction turbines for four different gate openings are shown in Fig. 5. 8. Fig. 5. 8 Constant head characteristics for Pelton wheel and reaction turbines 38 5. 11 Cavitation in turbines When the pressure in any part of the turbine reaches the vapour pressure of the flowing water, it boils and small bubbles of vapour form in large numbers. These bubbles are carried along by the flow, and on reaching the high pressure zones these bubbles suddenly collapse as the vapour condenses to liquid again.The alternate formation and collapse of vapour bubbles may cause severe damage to the surface which ultimately fails to fatigue and the surface becomes badly scored and pitted. This phenomenon is known as cavitation. In order to determine whether cavitation will occur in any portion of the turbine, D. Thomas has developed a dimensionless parameter called Thomas'cavitation factor ? which is expressed as ?= Ha ? Hv ? Hs H †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 2) where Ha = atmospheric pressure head Hv = vapour pressure head Hs = suction pressure head For Francis turbines: Critical cavitation factor ? c = 0. 625 (Ns/444)2 †¦Ã¢â‚¬ ¦.. (5. 3) For Propeller turbines: ? c = 0. 28 + [ Example 5. 1 1 Ns 3 ( )] 7. 5 444 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (5. 4) Est imate the maximum height of straight conical draft tube of a 18000 h. p. Francis turbine running at 150 r. p. m under a net head of 27 m. The turbine is installed at a station where the effective atmospheric pressure is 10. 6 m of water. The draft tube must sink at least 0. 77 m below the tail race. Ns = NP H5/ 4 = 327 39 ?c = 0. 625 (Ns/444)2 = 0. 339 Cavitation factor ? = Ha -Hv -Hs H Ha -Hv = 10. 6 m, H =27 m 0. 339 = 10. 6 -Hs 27 Hs = 1. 45 m Max length of the draft tube = 1. 45 + 0. 7 = 2. 22 m 5. 12 Governing of Turbines All the modern turbines are directly coupled to the electric generators. The generators are always required to run at constant speed irrespective of the variations in the load. This constant speed N of the generator is given by the expression N= 60 f p †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (5. 5) where f = frequency (usually 50) p = numbers of pairs of poles 5. 13 Water Hammer A gate or valve at the end of the penstock pipe controls the discharge to the turbine. As s oon as this governor regulated gate opening is altered, the pipe flow has to be adjusted to the new magnitude of flow.In doing so, there are rapid pressure oscillations in the pipe, often accompanied by a hammering like sound. Hence this phenomenon is called as water hammer. 5. 14 Jet Speed The velocity of flow of the jet depends upon the total net head H at the base of the nozzle and is given by the nozzle equation: v = C v ? 2gH where the discharge coefficient velocity of the nozzle is taken as 0. 95. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 6) 40 5. 15 Bucket speed V= ? DN 60 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 7) The bucket speed should be half of the jet speed. In practice, losses in the turbine cause the maximum efficiency to occur at slightly less than a half, typically 0. 46. V =0. 6 v 5. 16 Design of Pelton Wheel Runner diameter: Runner diameter can be found out from the rpm equation. D= 38 ? H N †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. (5. 8) where N = runner speed(rpm) H = net head Nozzle diameter: The nozzle diameter is given by the nozzle equation: d = 0. 54 ? Q 0. 5 1 ? 0. 25 H n jet †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. (5. 9) Jet ratio: Jet ratio D/d is a size parameter for the turbine. It has a value in a range of 10 to 24. For the high efficiency Pelton wheel design, the ratio of the runner diameter to the nozzle should be more than 9. Number of buckets: The number of buckets required for the efficient operation of the Pelton turbine is calculated as:N buc = 0. 5 ? D + 15 d †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (5. 10) In practice, the selection and the detail design of the turbine units are carried out by the manufactures based on the model performances. 41 Example 5. 2 Powerhouse is equipped with a vertical shaft pelton turbine. The generator is provided with 6 pairs of poles. Design discharge is 1. 4 m3/s and net head is 425 m. The turbine will provide 6500 hp. Take coefficient of nozzle as 0. 95. Determine (a) the specific speed (b) velocity of jet (c) jet diameter (d) pitch circle diameter of the wheel (e) number of buckets (a) N= 60 f p = 60 x 50/6 = 500 rpmNs = = NP H5/ 4 500 6500 4255 / 4 = 20. 9 Use single jet pelton turbine (b) velocity of jet v = C v ? 2gH = 0. 95 ? 2Ãâ€"9. 81Ãâ€"425 = 86. 75 m/s (c) jet diameter d = 0. 54 ? = 0. 54 ? Q 0. 5 1 ? 0. 25 H n jet 1. 4 0. 5 425 0. 25 ? = 0. 14 m =14 cm 1 1 42 (d) pitch circle diameter D= 38 ? H N = 1. 57 m (e) Number of buckets N buc = 0. 5 ? N buc = 0. 5 ? D + 15 d 1. 57 + 15 0. 14 = 20. 6 = 21 5. 17 Work done of Pelton Wheel In turbines, the water flows on to the runner, which itself is rotating with a certain speed. The water flows over the runner and leaves the runner at its outlet point.We can speak of absolute velocity of water before it flows in the runner, the relative velocity of water w. r. t the runner and again the absolute velocity of water after it has left the runner. In order to ascertain the relationship between these velocities, the velocity vector diagram prove to be very useful. Fig. 5. 9 shows the velocity triangles at the tips of the bucket of a pelton wheel. At the outlet tip velocity triangles are different depending upon the magnitude of u corresponding to which it is slow, medium or fast runner. Inlet velocity diagram VVri Vai =Vwi 43 Outlet velocity diagram V Vwo ? ? Vfo Vro Vao Fig. 5. 9 Velocity triangles V = bucket velocity Vai = absolute velocity of jet at inlet tip Vai = Cv 2 gH1 Vao = absolute velocity of jet at outlet tip Vri = relative velocity of jet at inlet = Vai-V Vro = relative velocity of jet at outlet = k. Vri Vwi = velocity of whirl at inlet =Vai Vwo = velocity of whirl at outlet = V-VroCos ? Vfo = velocity of flow at outlet Mass/sec m =? Q =? a Vai=? ?/4 d2 Vai †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 11) Workdone on the bucket/sec (power developed by turbine) P = m (Vwi -Vwo) V †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 12)Maximum hydraulic efficiency ? h max = 1 (1 + kCos? ) 2 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(5. 13) The hydraulic efficiency is maximum when the bucket speed is equal to half of the velocity of jet. 44 Example 5. 3 The head available at entrance to the nozzle supplying a pelton wheel is 300 m and the coefficient of velocity for the nozzle is 0. 98. The wheel diameter is 1. 8 m and the nozzle diameter is 125 mm. The buckets deflect the jet through 165 °. Assuming the relative velocity of the jet is reduced by 16%, calculate the theoretical speed in rev per min for the maximum hydraulic efficiency.What is the hydraulic efficiency when running at this speed, and what is the power developed? Deflection angle =165 ° = (180- ? ) ? = 15 ° k = 0. 84 hf hn H'=Vai2/2g H For max hydraulic efficiency V/Vai =0. 5 Vai = Cvv2gH1 = 75 m/s V =Vai/2 = 37. 5 m/s V =? DN/60 N =60V/? D = 398 rpm ?hmax = 1/2 (1+ k Cos ? ) = 90. 55 % mass/sec = m = ? Q = ? ?/4 d2 Vai = 920 kg/sec H1 45 Inlet diagram: V Vri From velocity diagram Vwi = Vai =75 m/s Vri = Vai- V =37. 5 m/s Vwi = Vai Outlet diagram: Vwo = V -Vro Cos ? V = V – k Vri Cos ? Vwo Vro Power = m V ( Vwi -Vwo) = 234600 Watts Vao =7 m/s 46 CHAPTER 6CENTRIFUGAL PUMP 6. 1 Introduction Centrifugal pumps are classified as rotodynamic type of pumps in which dynamic pressure is developed which enables the lifting of liquids from a lower to a higher level. The basic principle on which a centrifugal works is that when a certain mass of liquid is made to rotate by an external force, it is thrown away from the central axis of rotation and a centrifugal head is impressed which enable it to rise to a higher level. Now, if more liquid is constantly made available at the centre of rotation, a continuous supply of liquid at a higher level may be ensured.Since in these pumps the lifting of the liquid is due to centrifugal action, these pumps are called ‘centrifugal pumps'. 6. 2 Advantages of centrifugal pumps over reciprocating pumps The main advantage of a centrifugal pump is that its discharging capacity is very much greater than a reciprocating pump which can handle relatively small quantity of liquid only. A centrifugal pump can be operated at very high speeds without any danger of separation and cavitation . The maintenance cost of a centrifugal pump is low and only periodical check up is sufficient .But for a reciprocating pump the maintenance cost is high because the parts such as valves etc. , may need frequent replacement. 6. 3 Component Parts of a Centrifugal Pump The main component parts of a centrifugal pump are: -impeller -casing -suction pipe -delivery pipe 47 Fig. 6. 1 Component part of a centrifugal pump 6. 4 Workdone by the Impeller The expression of the workdone by the impeller of a centrifugal pump on the liquid flowing through it may be derived in the same way as for a turbine. The liquid enters the impeller at its centre and leaves at its periphery. Fig. 6. shows a portion of the impeller of a centrifugal pump with one vane and the velocity triangles at the inlet and outlet tips of the vane. V is absolute velocity of liquid, u is tangential velocity of th e impeller, Vr is relative velocity of liquid, Vf is velocity of flow of liquid, and Vw is velocity of whirl of the liquid at the entrance to the impeller. Similarly V1,u1,Vr1,Vf1 and Vw1 represent their counterparts at the exit point of the impeller. 48 Fig. 6. 2 Velocity triangles for an impeller vane ? = the impeller vane angle at the entrance ? = the impeller vane angle at the outlet = the angle between the directions of the absolute velocity of entering liquid and the peripheral velocity of the impeller at the entrance ? = the angle between the absolute velocity of leaving liquid and the peripheral velocity of the impeller at the exit point Work done per second by the impeller on the liquid may be written as Work done = W ( Vw1 u1 – Vw u) ————-(6. 1) g where W kg of liquid per second passes through the impeller. Since the liquid enters the impeller radially ? = 90 and hence Vw = 0. Thus equation (6. 1) becomes Work done = W (Vw1u1) —â⠂¬â€Ã¢â‚¬â€Ã¢â‚¬â€-(6. ) g 6. 5 Head of a Pump The head of a centrifugal pump may be expressed in the following two ways: (a) Static head (b) Manometric head (or total head or gross head) 49 Fig. 6. 3 Head on a centrifugal pump (a) Static Head Static head is the vertical distance between the liquid surfaces in the pump and the tank to which the liquid is delivered by the pump. Static head (or lift) Hs = hs + hd where hs = static suction lift hd = static delivery lift †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (6. 3) 50 (b) Manometric Head Manometric head is the total head that must be produced by the pump to satisfy external requirements.If there are no energy losses in the impeller and the casing of the pump, then the manometric head Hm will be equal to the energy given to the liquid by the V ? 1u1 g impeller, i. e Hm = . But if losses occur in the pump then V ? 1u1 ? losses of head in the pump g †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (6. 4) Applying Bernoulli’s equation between the points, O at the liqui d surface in the pump and 1 in the suction pipe just at the inlet to the pump (i. e. , at the centre line of the pump), the following expression is obtained if the liquid surface in the sump is taken as datum. 0= p s Vs2 + + hs + h f s ? 2g ps Vs2 ? [ + hs + h fs ] 2g ? †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. (6. 5) where ps is the pressure at point l ; Vs is the velocity of flow in the suction pipe ; hs is the suction lift and hfs is the head loss in the suction pipe which includes the head loss due to friction and the other minor losses. It may however be pointed out that if the pump is situated below the level of the liquid surface in the sump, hs will be negative. Equation (6. 5) indicates that at the inlet to the pump there is always a suction or vacuum pressure developed which will be recorded by the vacuum gauge provided at this point as shown in Fig. . 3. The head expressed by equation (6. 5) is called the suction head of the pump. Also, applying Bernoulli’s equation between points 1 and 2, which is just at the outlet of the impeller and is assumed to be at the same level as point 1, then since the impeller imparts a head equal to (Vw1u1/g) to the liquid the following expression is obtained: p s V s2 V? 1u1 p 2 V12 + + = + + hLi ? 2g g ? 2g †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. (6. 6) where p2 is the pressure and V1 is the absolute velocity of the liquid leaving the impeller and hLi is the loss of head in the impeller. 51 6. Specific Speed of Centrifugal Pumps In order to compare the performance of different pumps, it is necessary to have some term which will be common to all centrifugal pumps. The term used for this purpose is the specific speed. The specific speed of a centrifugal pump is the speed at which the specific pump must run to deliver unit quantity against unit head, the efficiency being the same as the actual pump. Ns = NQ H 3/ 4 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(6. 7) where Ns= specific speed N = rotational speed(rpm) H = total head 6. 7 Performance of Pumps- Charact eristic CurvesA pump is usually designed for one speed, flow rate and head in actual practice, the operation may be at some other condition of head on flow rate, and for the changed conditions, the behaviour of the pump may be quite different. Therefore, in order to predict the behaviour and performance of a pump under varying conditions, tests are performed and the results of the tests are plotted. The curves thus obtained are known as the characteristic curves of the pump. The following three types of characteristic curves are usually prepared for the centrifugal pumps : a) Main and operating characteristics. (b) Constant efficiency or Muschel curves . (c) Constant head and constant discharge curves. Main and Operating Characteristics In order to obtain the main characteristic curves of a pump it is operated at different speeds. For each speed the rate of flow Q is varied by means of a delivery valve and for the different values of Q the corresponding values of manometric head Hm, shaft H. P. , P , and overall efficiency ? are measured or calculated. The same operation is repeated for different speeds of the pump. Then Q v/s Hm ; Q v/s P and Q v/s ? urves for different speeds are plotted, so that three sets of curves, as shown in Fig. 6. 4 are obtained, which represent the 52 main characteristics of a pump. The main characteristics are useful in indicating the performance of a pump at different speeds. During operation a pump is normally required to run at a constant speed, which is its designed speed, (same as the speed of the driving motor). As such that particular set of main characteristics which corresponds to the designed speed is mostly used in the operations of a pump and is, therefore, known as the operating characteristics.A typical set of such characteristics of a pump is shown in Fig. 6. 5 Fig. 6. 4 Main characteristics of a centrifugal pump Fig. 6. 5 Operating characteristic curves of a centrifugal pump 53 6. 8 Parallel or Series Operation of Pu mps Pumps in series Centrifugal pumps generate a relatively low head delivering a fairly high rate of discharge. Normally a pump with a single impeller can be used to deliver the required discharge against a maximum head of about 100 m. But if the liquid is required to be delivered against a still larger head then it can be done by using two or more pumps in series. Fig. 6. 6 Three stage centrifugal pumpIf the required head is more than that can be provided by one pump, the pumps are connected in series. The same discharge passes through both pumps but the head developed by one pump add the other. The total head developed is obtained by adding together the value of the head of each pump corresponding to the relevant discharge. Pumps in Parallel The multi-stage pumps or the pumps in series as described earlier are employed for delivering a relatively small quantity of liquid against very high heads. However, when a large quantity of liquid is required to be pumped against a relativel y small head, then it may 4 not be possible for a single pump to deliver the required discharge. In such cases two or more pumps are used which are so arranged that each of these pumps working separately lift the liquid from a common sump and deliver it to a common collecting pipe through which it is carried to the required height Fig. 6. 7. Since in this case each of the pumps deliver the liquid against the same head, the arrangement is known as pumps in parallel. If Q1, Q2, Q3†¦.. , Qn are the discharging capacities of n pumps arranged in parallel then the total discharge delivered by these pumps will beQt = (Q1+Q2+Q3+†¦Ã¢â‚¬ ¦+Qn) †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. (6. 8) If the discharging capacity of all the n pumps is same, equal to Q , then the total discharge delivered by these pumps will be Qt = nQ Fig. 6. 7 Two centrifugal pumps arranged in parallel 55 A centrifugal pump, having four stages in parallel, delivers 11m3/min of Example 6. 1 liquid against a head of 24. 7m , the diameter of the impeller being 225mm and the speed 1700 rpm. A pump is to be made up with a number of identical stages in series, of similar constriction to those in the first pump, to run at 1250 rpm, and to deliver 14. 5 m3/min, against a head of 248m.Find the number of stages required for the second pump. 1st Pump 2nd Pump Q = 11m3/min Q = 14. 5m3/min H = 24. 7 m H = 248 m N = 1700 rpm N =1250 rpm D = 225 mm Specific speed N s = NQ H 3/ 4 Q for one pump = 11/4 = 2. 75 m3/min Ns = 1700 2. 75 24. 7 3 / 4 = 254 For 2nd pump, with identical stages in series i. e multi-stage pump, if each stage is similar to those of each stage is similar to those of the first pump. The specific speed of each stage Ns = 254 Ns = 254 = NQ H 3/ 4 1250 14. 5 H 3/ 4 H = 49. 64 m Total head required = 248 m No of stages required = 248/49. 64 = 5 stages 56 CHAPTER 7DIMENSIONAL ANALYSIS, HYDRAULIC SIMILITUDE AND MODEL INVESTIGATION 7. 1 Dimensional Analysis Dimensional analysis is a mathematical method of obtaining the equations, changing units, determining a convenient arrangement of variable of a physical relation. In an equation expressing a physical relationship between quantities, absolute numerical and dimensional equality must exit. In general, all such physical relationships can be reduced to the fundamental quantities of mass M, length L and time T. It is a based on the assumption that the phenomenon can be expressed by a dimensionally homogeneous equation, with certain variable.The dimensional analysis is widely used in research work for developing design criteria and also for conducting model tests. 7. 2 Dimensions and Units All physical quantities are measured by comparison. This comparison is always made with respect to some arbitrarily fixed value for each independent quantity, called dimension(e. g. , length, mass, time, etc. ). Since there is no direct relationship between these dimensions, they are called fundamental dimensions. Some other quantities such as area , volume, velocity, force etc. can not be expressed in terms of fundamental dimensions and thus may be alled derived dimensions. There are two systems for fundamental dimensions namely FLT (i. e force, length, time) and MLT (i. e. , mass, length, time). One common system employed in dimensional analysis is the M,L,T system. Table is a listing of some of the quantities used in fluid flow, together with their symbols and dimensions. 57 Quantity Symbol Dimensional Form Length l L Time t T Mass m M Velocity v L T-1 Acceleration a L T-2 Force F M L T-2 Pressure P M L-1 T-2 Discharge Q L3 T-1 Power P M L2 T-3 W,E M L2 T-2 Density ? M L-3 Dynamic viscosity  µ M L-1 T-1 Kinematic viscosity ? L2 T-1 Surface tension M T-2 Work,energy 7. 3 Methods of Dimensional Analysis The methods of dimensional analysis are: -Buckingham's ? theorem -Ralyeigh's method Buckingham's ? Theorem If there are ‘n' variables in a dimensionally homogeneous equation, and if these variables contain ‘m' fu ndamental dimensions such as (M,L,T) , they may be grouped into (nm) non-dimensional independent ? terms. Mathematically, if a variable x1 depends upon independent variables x2, x3,x4, †¦. ,xn, the functional equation may be written as x1 = f (x2, x3, x4, †¦. , xn) The equation may be written in its general form as 58 f1 ( x1, x2, x3,†¦Ã¢â‚¬ ¦. xn) = C In this equation there are ‘n' variables. If there are ‘m' fundimental dimensions, the according to ? theorem f2 ( ? 1,? 2,? 3,†¦.. , ? n-m ) = C1 e. g Q = f (d,H, µ,? ,g) f1 (Q, d, H,  µ, ? , g) = C n = 6; m = 3; (n-m) = 3 f2 ( ? 1, ? 2, ? 3) = C1 Procedure 1. First of all, write the functional relationship with the given data. 2. Then write the equation in its general form. 3. Choose ‘m' repeating variables and write separate expressions for each term. Every ? term will contain the repeating variables and one of the remaining variables. The repeating variables are written in exponential form . 4.With the help of the principle of dimensional homogeneity, find out the values of the exponents by obtaining simultaneous equations. 5. Substitute the value of these exponents in the ? term. 6. After the ? terms are obtained, write the functional relation in the required form. e. g Q = f ( d, H,  µ, ? , g) f1 (Q, d, H,  µ, ? , g) =C n = 6 , m = 3 , (n-m) = 3 f2 (? 1,? 2,? 3)=C1 Choose ? , g, d as repeating variable, ?1 = ? a1 gb1 dc1 Q ? 2 = ? a2 gb2 d c2 H ? 3 = ? a3 gb3 dc3  µ 59 Selection of Repeating Variable 1. The variables should be such that none of them is dimensionless. 2. No two variables should have the same dimensions. . Independent variables should be as far as possible, be selected as repeating variable. ? > fluid property ? > flow characteristics l > geometric characteristics Example 7. 1 A V-notch weir is a vertical plate with a notch angle ? cut into the top of it and placed across an open channel. The liquid in the channel is backed up and forced to flow through the notch. The discharge Q is some function of the elevation H of upstream liquid surface above the bottom of the notch. In addition it depends upon gravity and upon the velocity of approach Vo to the weir. Determine the form of discharge equation: ?V ? Q = gH 5/2 f ? ,? ? ? gH ? ? ? Q = f (H, g , Vo , ? ) f1 ( Q, H ,g ,Vo, ? ) = C Choose g and H as repeating variables n = 5; n-m =3 ; m=2 ?1 = Ha1 gb1 Q = (L)a1 (LT-2)b1 L3 T-1 ?2 =Ha2 gb2 Vo = (L)a2 (LT-2)b2 LT-1 ?3 = ? (M)o (L)o (T)o = (L)a1 (LT-2)b1 L3 T-1 a1+b1+3 =0 ? a1 = -5/2 -2b1-1 =0 ? b1 = -1/2 ?1 = H-5/2 g-1/2 Q = Q vg H 5/2 (M)o (L)o (T)o = (L)a2 (LT-2)b2 L T-1 a2 = -1/2 60 b2 = -1/2 ?2 =H-1/2 g-1/2 Vo= Vo vgH Q f2 ( gH 5/ 2 Q gH 5/ 2 , Vo ,? gH ) = C1 Vo ,? gH ) Vo ,? gH ) =f( Q = gH 5/2 f ( Example 7. 2 Q = VD 2 f [ Prove that the discharge over a spillway is given by the relation gD H ,] V D where V= velocity of flowD = depth of throat H = Head of water g = Acceleration due to gravity Q= f (V,D,H,G) f1 (Q,V,D,H ,G) = C Choose V and D as repeating variables n = 5, m =2, n-m =3 ?1= Va1 Db1 Q = (LT-1)a1 (L)b1 (L3T-1) ?2 = Va2 Db2 H = (LT-1)a2 (L)b2 (L) ?3 = Va3 Db3 g = (LT-1)a3 (L)b3 (LT-2) M0L0T 0 = (LT-1)a1 (L)b1 (L3T-1) 0 = -a1-1 ; a1 = -1 0 = a1+b1+3 ; b1= -2 ?1 = V -1 D -2 Q 61 ?1 = Q VD2 M0L0T 0 =(LT-1)a2 (L)b2 (L) 0 = -a2 a2+b2+1 =0 ; b2 = -1 ?2 = V0 D-1 H = H/D M0L0T 0 = (LT-1)a3 (L)b3 (LT-2) 0 = -a3-2 ; a3 = -2 0 = a3+b3+1 ; b3 =1 ?3 = V-2 D g gD V = f2 ( gD H , )=0 VD 2 D V Q VD 2 Q , = f( gD H ,) V D Q = VD 2 f ( 7. 4 D H ,) V D HYDRAULIC MODELS Hydraulic models, in general, may be either true models or distorted models. True models have all the significant characteristics of the prototype reproduced to scale (geometrically similar) and satisfy design restrictions (kinematic and dynamic similitude). Model-prototype comparisons have clearly shown that the correspondence of behaviour is often well beyond expected limitations, as has been attested by the successful operation of many s tructures designed from model tests. 7. 5 Hydraulic Similitude To know the complete working and behaviour of the prototype, from its model, there hould be a complete similarity between the prototype and its scale model. This similarity is 62 known as hydraulic similitude. From the subject point of view, the following three types of hydraulic similitude are important. (1) Geometric similitude (2) Kinematic similitude (3) Dynamic similitude GEOMETRIC SIMILITUDE The model and the prototype are identical in shape, but differ only in size. (The ratios of all the corresponding linear dimensions are equal) . Let L = Length of the prototype B = Breadth of the prototype D = Depth of the prototype l,b,d = corresponding values of the model L Linear ratio Lr =Area ratio Ar = ( Volume ratio Vr = ( l = BD = bd L B D )2 = ( )2 = ( )2 l b d L B D ) 3 = ( ) 3 = ( )3 l b d KINEMATIC SIMILITUDE The model and the prototype have identical motions. ( The ratios of the velocities at corresponding points a re equal) Let V1 = velocity of liquid in prototype at point 1 V 2 = velocity of liquid in prototype at point 2 v1,v2 = corresponding values of the model Velocity ratio Vr = V1 V2 = = †¦.. v1 v 2 DYNAMIC SIMILITUDE The model and prototype have identical forces. (The ratios of the corresponding forces acting at corresponding points are equal). F Force ratio Fr = 1 = f1 F2 †¦.. f2 63 7. 6 CLASSIFICATION OF MODELS (1) Undistorted model (2) Distorted model Undistorted model A model which is geometrically similar to the prototype is known as undistorted model. Distorted model Model does not have complete geometric similarity with the prototype, is known as distorted model. 7. 7 Comparison of an Undistorted Model and the Prototype If the model is to be overall similar to the prototype, then all the three similarities (i. e, geometric, kinematic, dynamic ) should exist. But this is not possible in actual practice, as it is difficult to exist two types of similarities simultaneousl y.In general, and undistorted model of a prototype is made keeping in view the geometric similarity only and the remaining similarities are then compared for the scale ratio. 7. 8 Velocity of Water in Prototype for the Given Velocity of an Undistorted Model Consider an undistorted model geometrically similar to a proposed prototype like a weir, dam, spillway etc. Let h = head of water over the model v = velocity of water at a point in the model H,V = corresponding values for the prototype 1/s = scale ratio of the model to the prototype Velocity of water in the model v = Cv v2ghVelocity of water on the corresponding point in the prototype V = Cv v2gH C v 2 gh v = = V C v 2 gH h 1 = H s V = v vs Example 7. 3 The velocity at a point on a spillway model of a dam is 1. 3m/sec for a prototype of model ratio 1:10. What is the velocity at the corresponding point in the prototype? 64 Velocity in the model v = 1. 3 m/s Model ratio, 1/s = 1/10 s = 10 Velocity in the prototype V = v vs V =1. 3 x v10 = 4. 11 m/sec 65 References: 1. Hydraulics and Fluid Mechanics P. N. Modi and S. M. Seth 2. Hydraulics, Fluid Mechanics and Hydraulic Machines R. S. Khurmi 3. Fluid Mechanics Victor L. Streeter

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Competition in Smartphone Markets - Essay Example For example, Samsung manufactures and sell its products, no other company can make Samsung products. This gives the company a chance to be in the monopolistic competition market. Development of monopolistic competitors in markets is driven by the profits that other firms are making in the market. Firms can make high profits normally called super normal profits based on the brands of their products that make the customers to be loyal to them. The following model shows monopolistic firms making super normal profits (Arnold, 2010). Super normal profits made by monopolistic competitors are indicated by the rectangle PXYZ. The super normal profits arise because the firm is making products of quantity OQ where the profit is at a maximum. This is indicated by the intersection of MC and MR where MR=MC. The price of the products is shown by OP and this is dictated by the demand curve AR. The intersection of MR and MC gives an equilibrium price XQ. The equilibrium price is greater than the ave rage cost indicated by YQ. The supernormal profits are indicated by XY that is the difference between XQ and YQ. To get the total super normal profits, XY is multiplied by PX and the result is the area of the shaded region. Clear analysis of the above graph shows that the price charged (P) is above the average cost (Arnold 2011). The above representation when integrated on one of the smartphones firms will attract other firms to the market. This is because it is free to enter into the market and the firms are motivated by the profits which a firm in the market is making because the graph is sloping downward. The entrance of other firms to the market makes changes in the economic model. In this analysis Apple, the Smartphone maker of the iPhone, is used as a monopolistic competitor in... Super normal profits made by monopolistic competitors are indicated by the rectangle PXYZ. The super normal profits arise because the firm is making products of quantity OQ where the profit is at a maximum. This is indicated by the intersection of MC and MR where MR=MC. The price of the products is shown by OP and this is dictated by the demand curve AR. The intersection of MR and MC gives an equilibrium price XQ. The equilibrium price is greater than the average cost indicated by YQ. The supernormal profits are indicated by XY that is the difference between XQ and YQ. To get the total super normal profits, XY is multiplied by PX and the result is the area of the shaded region. Clear analysis of the above graph shows that the price charged (P) is above the average cost (Arnold 2011). The above representation when integrated on one of the smartphones firms will attract other firms to the market. This is because it is free to enter into the market and the firms are motivated by the profits which a firm in the market is making because the graph is sloping downward. The entrance of other firms to the market makes changes in the economic model. In this analysis Apple, the Smartphone maker of the iPhone, is used as a monopolistic competitor in the market. The profit which is made by the company is shown on the graph. The profit is just for a short-run. In the long-run, other competitors enter the market.

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Business Continuity Management - Risk Management - Essay Example There are generally two types of risks that businesses face, the first is the risk of natural calamities and the second is the entrepreneurial risk. Here we are going to discuss the second type of risk factors of Royal Bank of Scotland. The second risk is the risk associated with the business functions, operations and the strategic decisions of the management. The concept of enterprise risk management arises in this scenario. Enterprise risk management is the process that affects the board of directors and other top level management of the organisation (Sadgrove, 2005, p. 3). The enterprise risk management process includes identification of and management of the risks that arises within the organisation. Enterprise risk management has many significant benefits, but at the same time few limitations also exists. It is many depended on the judgment of the human resource (Casualty Actuarial Society, 2003). So this signifies that if the human resource that is the employees or the manageme nt commits errors, then that might affect the measures taken for risk measurement. Apart from this, clash of decisions or view points between two individuals might also result in overriding the decisions of the management (Committee of Sponsoring Organizations of the Treadway Commission, 2004, p.5). The Business continuity management strategies is the core business function of any organisation for understanding the risk and also for designing the risk assessment measures. Business Continuity management helps the management to identify the difference between the problems and the risks. Crisis management and crisis communication are also involved in business continuity management because the risk faced by the organisations is generally for sudden crisis situations. Crisis is basically the unstable situations that may take place related to political, economical or social affair. So crisis management deals with management of risk of uncertainties. Business continuity policies or plans i nvolve the utilisation of resources to eliminate or transfer the risk that the organisations face during crisis situations (Blyth, 2009, Crisis Management). The process of risk management should be continuous and effective. It is the function of the business continuity management process to address the risk factors and understand the type of risks or crisis that the organisation is facing or about to face. This study would also deal with organisational crisis situations of Royal Bank of Scotland (RBS). It is one of the renowned banks in the world. RBS had a strong culture for risk management and controlling the activities for financial strength. The RBS was literally brought to its knees by the top level management of the organisation. The report of the Financial Services Authorities (FSA) stated that the crisis of the organisation was due to the deficiencies of the management and the organisational environment and culture of RBS before the crisis. The policies were liberal and they were not even revised for the betterment of the organisation (Barkho, 2011, p. 44). Crisis Management and Crisis Communication Crisis management and crisis communication are often used as interchangeable words in organisations, but there is little distinction between these two events. The crisis management basically deals with the reality part of any crisis that occurs in the organisation, while crisis communicat

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Workplace policies and practices. DreamWorks Animation - Essay Example This paper considers six policies and practices which contribute to the high level of employee engagement that exists in the company: commitment to the highest quality, diversity in recruitment, coaching and mentorship, a relaxed and â€Å"fun environment to stimulate creativity, and flexible teamwork. DreamWorks Animation is company that many creative people aspire to work for, and perhaps the most attractive feature about this organization is that it is simply the best in the industry. This high quality image brings a sense of pride to all of its employees but it also brings with it extremely high expectations in times of quality of work and adherence to tight deadlines. The company attracts the brightest and best employees because of its profile as a leading and innovative animated movie producer and so long as it maintains this position it will make them want to stay and achieve even more success. The company webpages show also a real commitment to diversity in the workforce, si nce the faces of leading employees are male and female, and different in terms of age and ethnic origins also. It is a young company with an international flavour. This diversity is useful to the company because it matches the global audiences for the company products, but there is also evidence this mix encourages innovative thinking and exchange of ideas. The different social and cultural backgrounds of the staff make for a stimulating and rich working environment. The company’s philosophy makes a big statement about this point, and it is clearly one of the company’s overarching and strategic aims to have unity in diversity: â€Å"In this friendly, open and collaborative environment, people of globally diverse talent and backgrounds push creative boundaries and enjoy an easy camaraderie. We attract a globally diverse group of artists, technologists, production and support staff who come together†¦Ã¢â‚¬  (DreamWorks Website). This commitment to be inclusive mea ns that the prevailing atmosphere is open and all staff are able to participate freely in company activities without fear of prejudice or inequality. Mutual respect marks the ethical tone of the company and this in turn leads to a more committed and contented workforce. Employee engagement begins at the point where people are recruited into the company. Vacancies are advertised on the company webpage, and of course the company requires very specific and certified skills in most of its employee roles. Experience is also needed in this industry, along with new ideas that are current in the youth cultures of the present time. Locating the right mix of talent and experience is difficult in animation, and DreamWorks takes a long term view of this task. It is commendable to note that there are outreach efforts in colleges and universities to draw in talent from all parts of society, including state as well as private educational institutions. In 2005, for example, the company started off an Outreach program to attract graduates who had no experience in the industry, but could demonstrate talent in their university work: â€Å"the goal of this program was to seed the next generation of creative and technical leadership at the Studio, and also to offset the rapidly rising salary rates for experienced talent.† (Newspeak.com case study, 2011) Some such ventures are little more than public relations stunts, but the company reports that 165 entry level graduates were hired, and 93% were retained, and 8 individuals were considered â€Å"

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Water pollution in China Essay Example | Topics and Well Written Essays - 1250 words

Water pollution in China - Essay Example In recent yearsï ¼Å'the world has been shocked at China’s rate of economic development. It was almost as if it happened overnight because all of a sudden China was a super-power in terms of its financial power. This has mostly been due to its several industries in the country which beside providing income for the people and revenue for the government, this has also come at a hefty price- pollution. The factories and production plants emit harmful gases and wastes which in turn pollute the environment. China’s environmental pollution problems have become a major concern around the world mostly because of its dense population, estimated at around 1 billion. Water pollution in particular is a very serious problem in China. To put this into perspective, China had an estimated 50, 000 rivers unfortunatley more than half of those rivers have since disappeared. A report from the Ministry of Environmental Protection indicates that, â€Å"Up to 40 percent of China’s riv ers were seriously polluted† and â€Å"20 percent were so polluted their water quality was rated too toxic even to come into contact with.† (Yongqiang, 2013). Water pollution not only threatens human health and development, but also jeopardizes China’s economic development plans (Economy, 2013). It is reported that water shortages cause an estimated loss of U.S. $11.2 billion (120 billion yen), while the its impact on human health has been approximated at U.S. $3.9 billion (41.73 billion yen per year). There has been a debate as to whether pollution should be dealt with austerely mainly because it will involve taking draconian measures against companies found liable. This will have a negative economic impact in the country. So the real debate is whether China wants to forego its economic development and in turn focus on eradicating pollution. This paper will look into the water pollution issue at length while seeking to answer whether economic development should be at the peril of the environment and humanity. The author is of the view that economic development should not be pursued at all costs. There are limits as to how far one can/should go in order to make profits. Currently in China there is no line to be crossed and companies are taking advantage of this. Pollution This refers to the contamination of air, water, or soil by substances which are harmful to living organisms. These substances may differ and they contaminate at varying degrees depending on their concentration. Ex amples of substances that may contaminate include; chemicals, waste (human and industrial) etc. These substances may also be referred to as pollutants. Water is very essential to not only human life, but also animal and plant life. In order for all these lives to be sustained, water is required but not just any water but clean and fit for consumption water. The quality of water which is declining at a very fast pace is mostly affected by human activities (Taylor, 2013). Some of the factors attributed to this include; population growth, the rise of urbanization, industrial production, among other factors. Industries are the largest source of water pollution and it is reported that several sources of water have a certain contamination level from industrial waste and chemicals (Spector, 2013). The management of waste water is a global challenge affecting various regions of the world. The existing sanitation- both industrial and municipal water treatment infrastructure is overloaded, th ey then seep directly into the environment thus contaminating the groundwater sources. Reports indicate that every day, approximately two million tons of sewage is discharged into the planet’s various water bodies- oceans, lakes and rivers. Currently, there are systems in place which have been set up to deal with such however they have thus far been unable to support the growing population and urbanization. Pursuing Economic Development at all costs Most companies have argued that focusing on pollution as

Entrepreneurship Essay Example | Topics and Well Written Essays - 1500 words - 10

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The impact and the influence of multiculturalism in Australia towards Essay

The impact and the influence of multiculturalism in Australia towards Anglo-Indian people - Essay Example It is currently often utilized to refer to the reality that a great deal of citizens in Australia possess, and identify several cultural or racial upbringings. Globalization creates a propagation of hyphenated, multinational characteristics (Lofgren & Sarangi 2009). Undeniably, it is nowadays reasonably conventional to falsify and keep multi-ethnic distinctiveness and adopt both national and intercontinental associations. Nonetheless, the countless dissertations of multiculturalism comprehend these contemporary characteristics in conflicting means. Anglo-Indians, or Eurasians, as they were identified in the nineteenth century, are the â€Å"mixed race† descendants of British colonialism in India and are seen by some to be paradigms of neo-liberal cosmopolitanism (Lofgren & Sarangi 2009). Snubbed by both Indian and British Societies, the experts in the arts, literature and sciences had minimal reason to focus to this very small community until rather lately. This paper aspires to identify the impact and influence of Multiculturalism in Australia towards Anglo-Indian people. It will begin with the reason why sudden interest on these very small community developed. It will also discuss the characteristics of Anglo-Indians in comparison to other races. In addition, it will explore the variety of effects that took place after multiculturalism was introduced in Australia following the demolition of the White Australia policy, particularly its consequences. It also deems to outweigh and tackle the benefits over the disadvantages of Multiculturalism in Australia. Point 1: The rationale behind the abrupt concern in the Anglo-Indian community Obsession of globalization, cosmopolitanism and post-modernism in their own ways Mixed races specifically Anglo-Indians embody qualities of variability, liminality and indemnity Establishes new challenges in formulating theories regarding mixed race subjects The need to address several post-structural critiques of essentialis m and subject centeredness arise The significance of unraveling the policies that shaped Australian population today Point 2: The Anglo-Indian population A minority group People of mixed descent Follows a significantly Western lifestyle They are Christians Speaks English as their primary language Observes European social customs Largely diasporic Never accepted as a member of the Indian and British communities Viewed as sexually promiscuous, alcoholic, indolent and morally corrupt individuals according to Indian popular culture and colonial fiction Recently known as the â€Å"Good Australians† Point 3: The effects of the demolition of the White Australia policy and the promotion of Australian multiculturalism The migration of many mixed races, specifically Anglo-Indians, to Australia The perception of Anglo-Indians as unwanted and unwelcomed non-Europeans by several sectors of the Australian population Anglo-Indians established a threat to Australian unanimity Intermarriage w as discouraged The rise of the desire to have a distinct political depiction Dispute against the National Government regarding encouragement of integration The adoption of the â€Å"non-discriminatory† policy in Australia Cross fertilization enriched the Australian society A more internationalist perspective for Australia The concept that Anglo-Indians are examples of contemporary multiculturalism The promotion of Anglo-Indi

Philippine Poetry Essay Example for Free

Philippine Poetry Essay Even before the foreign invaders came to the Philippines, the Filipinos already had their own cultural traditions, folklore, mythologies and epics. There were substantial writings by early natives that Jesuit historian Fr. Pedro Chirino noted: All of the islanders are much given to reading and writing. And there is hardly a man, much less a woman who did not read and write. Epics are stories that are written in poetic form. They are usually described to display such tremendous vitality, color and imagination. Epic stories are tales about love and adventures of native heroes. The heroes adventures are usually about how they become endowed with powers from the gods, battle monsters, triumph over formidable armies, ride the wind, travel on flying shields and protect the earliest communities of the islands. Through the years, epic poems have grown and matured. Early historians like Padre Colin, Joaquin Martinez de Zuniga and Antonio Pigafetta have all attested to the existence of these epics. At the arrival of Don Miguel Lopez de Legaspi in 1565, it was reported, the natives presented him with a dramatic play. During festivities and special occasions, epic poems and songs area performed. Most often, these epic poems (folk epics or ethno-epics) were titled after the names of the hero involved, except for some which carry traditional titles like the Kalinga Ulalim; the Sulod Hinilawod; the Maranao Darangan; or the Bicol Ibalon. Old Time History, as stories about folk heroes of long ago are referred to, is used to study the lifestyle and beliefs of the people of that time. They were also referred to as lost, because they were soon forgotten by natives influenced heavily by Spanish and western colonization. It has been said that during the early days of the Spanish intrusions, the priests destroyed all existing records of paganism, as well as all forms of writing and art work regarding the ancient Philippine folk heroes. This has been proven to be false due to the fact that the early epic poetry is still known and used at present as reference in studies of the past especially the lifestyle, love and aspirations of the early Filipinos. This valuable inheritance from the past must be preserved for this can be used as a proof for national identity. It is from these that a Filipino can feel heroic, truly pulsating with splendor of a magnificent and authentic cultural force. Being composed of thousands of islands, it is no wonder that the country is rich in culture and tradition with various influences in different parts of the nation. As a result, the Philippines has become a melting pot of nations and is a source of a rich variety of culture and stories. The following are some examples of the epic poetry found in the country.

School System Essay Example for Free

School System Essay I. Introduction In this chapter, the researchers would like to propose an automated billing system in AMA Computer Learning Center (ACLC) College of Gapan City, Nueva Ecija. In our generation so many things are different. The advent of technology has changed the way we live, work and spends leisure time. Computer was considered the lifeblood of society; they are everywhere. And the advancement in discoveries, both in hardware and software, keep coming, day in and day out. Technology changes and improves at a rapid pace and companies and institutions have cope with it. This is because as the latest knowledge of development in computer technology grows people’s standard increase. They seek and crave for better and more efficient ways to accomplish tedious task. The group of Companies was built upon the dream of the late Amable M. Aguiluz Sr. (AMA), Auditor General and National Treasurer during the term of President Diosdado Macapagal, to build an institution that would provide world-class education to Filipino y0uth. That dream bore fruit on October 20, 1980 when his son Dr. Amable R. Aguiluz V. (ARA), established the AMA Institute of Computer Studies and blazed the trail for popular computer education in the country. Originally located along Show Boulevard, the pioneering school offered EDP Fundamentals, Basic Programming and Technology Career courses. In June 1981, AMA Computer College (AMACC) was launched offering a four-year degree course in BS Computer Science – the first to be offered in the country. From only 13 students, the population of AMACC surged to 600 in 1983 and to 1985. To meet the growing demand for computer courses, AMACC established its first campus in Makati in 1983. A second campus followed in 1986 in project 8, Quezon City. In 1987, AMA Computer Learning Center (ACLC) was established to offer short courses in computer programming and two-year technical vocational courses. Today, there are today more than 100 learning centers nationwide. In the same year, AMA Basic Education was formed to offer courses elementary, high school and eventually pre-school education. Now known as the St. Augustine International School, its branches are located in Metro Manila, Laguna, Cebu, and Davao. In 1996, AMA set up the AMA Telecommunications and Electronics Learning Center (AMATEL) – the country’s first-ever telecommunications school. It is now called AMA International Institute of Technology (AIIT). In 1998, ABE International Business was established to offer courses in Hotel and Restaurant Management (HRM), Business Administration and computer-related courses. Today, ABE has several branches nationwide. ABE is an international school affiliated with ABE in the United Kingdom. It offers not just local, but also international diploma and international practicum program. The AMA school network also expanded overseas with branches in Los Angeles, California; Manama; Bahrain; Bangladesh; China; and Hong Kong. In 2000, AMAES launched its most ambitious expansion program with no less than 14 branches being set up nationwide. To help it graduates finds employment, AMA established in the same year its own manpower placement agency called INFOTECH Professional Services Inc. The year 2002 saw AMA expanding into maritime education, medicine, nursing, care-giving and allied health courses. Now, the Norwegian maritime Academy (NMA), the AMA school of Medicine (ASM), and the St. Augustine School of Nursing (SASN) are making a mark in their respective fields with IT-based curricula. AMA Education System (AMAES) – the umbella for AMA schools, currently boasts of more than 200 branches nationwide and in key foreign cities. It has proudly produced more than 150,000 professionals who have been gainfully employed locally and overseas. On August 20, 2002, AMA was granted University status by the Commission on Higher Education (CHED) – a well-earned tribute to the first ISO-certificated computer educational Institution in the Philippines. Founding Chairman Dr. Amable R. Aguiluz V was installed as the first AMA University president. The billing system throughout the school has relied on pens and papers. The information of the students with regards to their billings, school fees, projected additional expenses, and other expenses within the year are done computing using pens and papers, they have a computer to encode the billing information, using the V-Look UP and Microsoft Office Excel 2007. Due to manual usage, they noticed that certain problems cannot be avoided like data redundancies, missing records of the students. Furthermore, some could not be able to handle the massive volume of the students. Under the old manual billing scenarios, getting rid of paper improves efficiency, reduces human errors and allow information to flow to their system without a time consuming data input process. And also a higher student turnaround as enrollees will be saved faster. And as the population of ACLC continues to grow, many difficulties in handling their billing in a manual process and one of the solution in this problem is to make their manual billing into a computerized system. With this, the proponent of this research sought to find the way to facilitate all the students billing records â€Å"an automated billing system† to replace the manual operations. The developer wants to improve especially to meet the needs of ACLC, also through this system, billing information is easily obtained hence, school tends to rely less in manual operations. II. Statement of the Problems The proponents would like to develop the ACLC to address the following problems of their school in terms of their billing system. 1. How the proposed enrollment system will help the school? 2. What are the advantages and disadvantages of the current manual enrollment to the proposed enrollment system? 3. How the proposed system helps the daily operations of the school? 4. How can ACLC come up to the solution that may possibly solve their manual enrollment process? 5. Who are those beneficiaries of the proposed billing system? 6. What are the difference in using the current and the proposed system? III. Objectives of the Study Creating a computerized enrollment system of ACLC is the main objective of the study. The following are the specific goals: 1. To develop the system that will minimize the processing time in accessing records, and calculating fees of students. 2. To provide a proper computer-based database for ACLC. 3. To build a user-friendly system that produces accurate and error-free data results. 4. To monitor the integration of the different operations, which includes billing data, database system, and payments, it is a need for computerization. 5. To secure all the billings, payments, fees of the students. 6. To lighten the load of the staff in accessing records. 7. To improve their billing system. IV. Scope and Delimitation The study covers the billing process in ACLC (AMA Computer Learning System). The centered on means of speeding up the billing report, computation of transactions of billing. This study will be a great help in converting the manual system to computerized system for great speed retrieval. The system developed in such way that the company will be able to obtain the following: Maintain the complete files in computerized form, prepare billing report in an easiest way, updates record time to time. The proposed system has the limitations, does not include time to time printing of transactions and does not retrieve data if have power interruption. V. Significance of the Study In the development of the study, the main goal of the developer is to develop a program that could be beneficial to as many people as possible. The computerized billing system is developed to provide constructive significance to the following: The Registrar – Student registration or enrolling will going to be much easier because of the proposed system, saving student files and adding subjects is convenient and faster. The Cashier To make their work easy and also they could handle all the billings of the students without time consuming data input process and can make the computation of every transaction in the easiest way. The Proponents the development of the system challenges the programming skills of the researchers whereby searching for a new programming platform to make the common and simple program through a more sophisticated and advance approach. Students they will accommodate in a short period of time during setting up their bill immediately. Management of the School – it helps to organize and supervise its company especially the students who give fund to operate the school properly in the process of giving correct billing. Parents – it helps them to know the total bill and load that their sons or daughters have for the whole semester and they are enrolled VI. Hypothesis of the Study The researchers will provide some predictions about the proposed billing system: 1. The proposed enrollment system will upgrade its manual enrollment process into an automated enrollment system. 2. It will lessen the works of the staff/ personnel through the help of proposed billing system. 3. The proposed system helps in minimizing the time and efforts and gives a convenient, more accurate, reliable, and there would be a consistent operations and procedures. 4. Through the help of proposed system, it will decrease the data handling errors of the students in their billings and information. 5. The proposed enrollment system could be the answer to the problems of the school in processing their billings. 6. The proposed enrollment system can change the current data management more efficient, secured, save more space for the office, handle or search student information easier and lessen data reiteration.

Origins Of English Figurative Idioms English Language Essay

Origins Of English Figurative Idioms English Language Essay Idiom is the combination of lexical items and has its own meaning which is different from the particular individual lexical items and this figurative expression is usually understood by the native speakers because figurative idiom expression is likely to be named as the conventional scene in the their mind that serves in the speech community. Similarity, idioms are consisted as a special set of lexical items due not only to their structure elements, but also they specify a unique set of behavior when used in very language discourse. Fernando argues that the concreted phrases and the arrangement pairs in idiomatic are recognized by the usage and with its stabilized structure and limited variation. To expand the explanation, idioms can be formed a word such as nevertheless, a phrase such as in favor of, and also a sentence such as the coast is clear. According to Boers definition of figurative idiom, whose meaning is barely inferred by its literal meaning of its constituent elements. Therefore, from the semantic point of view, the expression of a figurative idiom cannot be understood from its individual parts. Structurally an idioms usually includes a series of words, any parts of its meanings cannot be replaced. Figurative idioms, it is a matter of extraordinary rather than ordinary languages. Base on Lakoff and Johnson explanation, idioms are also known as the metaphor that serves as a device of poetic imagination and the rhetorical flourish dedicates for most languages. Moreover, figurative expressions are not merely bundles of word combination; however it is a phrase that ordinarily invented to one situation that inferred to another, making an implicit comparison. Another scholar Tang explains figurative idioms unsurprisingly have been coined with the name of its meaning. Ultimately, the figurative interpretation of every idiom evokes the metaphorical expressions. As the manifestation of conceptual metaphor was introduced, Z. Kovecses conceptualizes metaphors are realized in other than linguistic ways. For example, literary works are constructed in their fully in term of conceptual metaphors such as Chaucers The Cantebury tales, Buyams The Pilgrim Progress or Frosts poem The Road not Taken are associated around the LIFE IS A JOURNEY metaphor. As result, although there is always a difference in every definition of figurative idiom, yet they all have the similar description to explain idioms have the obvious characteristics of semantic incorporated and structural stability. 2.1) Culture context Language structure is the most typical feature of cultural aspects that such relationship particularly found in the lexicon. As Wierzbicka lists out the best evidence for reality of cultures can associate the meanings of words that eventually provides ways of living, speaking, thinking, and feeling which are broadly shared in every particular society. In addition, the Polish anthropologist Malinnowsky is the first founder of the context theory thinks that discourse and context are mutually hanging closely together, the language environment is essential to understand language.(à ¢Ã¢â€š ¬Ã‚ ¦) Meanwhile, Boers and Stengers declare the significant of cultural figurative expression has been emphasized much recent research. Gibbs study claims that idioms are established in all languages and several types of idioms are cultural elements. Wierzbicka states that most of figurative idioms are cultural artifacts, reflecting the aspects the creation of figurative idioms which are formed by cultural elements. Thus, Inchaurralde mentions particular lexical units are linked with cultural lexical scripts, which are associated to a certain cultural background. Furthermore, Lennon points out language and culture are important to idioms because it could reflect the transformation in conceptualization of the universe and the relationship between the universe and the mankind. The Chinese Linguist Hu Zhunaglin has divided the cultural context into three types: linguistics context, situational context, and cultural context. Most importantly, the cultural context refers the involvement of social, economic, cultural, political background, and religions contexts occur in communities that would value the standard of a certain language. Dobrovolskij and Piirainen comes out with an idea to describe the different types of cultural phenomena are interrelated with conventional figurative units. This means that culturally marked lexis has focused on cross-cultural similarity and the variation across in the conceptualization of emotions. Another issue that Lakoff and Johnson discuss about whether all cultures have the same conceptual of the world. Base on Issac simplification, every figurative expression has a certain class of metaphors seems to be universal. However some cultural specifications also occur in conceptual metaphor, in other word, different culture have a different set of value systems that might result in different interaction to certain expression from others cultures. For example, in Shakespeares period, the food egg is to characterize people behavior or attitude, for instance, She is a good egg means that she is a nice person. In Chinese, there is record in the literature work egg transcript to mandarin Dan also symbolizes to a person behavior and attitude. The Mandarin word huai dan signifies as bad person. These two different cultural context has shared the same particular meaning of the phrase is directed and extended to describe people who seen to be decent person. Although English and Chinese utilize the food egg to imply the same target expression, on the other hand, the English expression good egg is to indicate a nice person, however the Chinese expression to indicate a nice person no longer utilizes egg to imply the meaning rather than change the whole word into hao ren instead of hao dan. 2.2) Idiom and culture Language has been always the carrier of culture and most important idioms that almost invariably to have their roots in a particular language. Another researcher Ronald Langacker argues that language is instrument and module of culture, speakers take part in a discourse situation, their cultural aspects are related to their acts of behavior and conversation. Moreover, Paul Friedrich calls the connection between language and culture as linguaculture. The conceptual of linguaculture is described as a domain of experience that fuses and intermingles the vocabulary, many semantic aspects of grammar, and the verbal aspects of culture; both grammar and culture have underlying structure while they are constantly being used and constructed by actual people on the ground. (à ¢Ã¢â€š ¬Ã‚ ¦) As an important part of language and culture, particular source domain of metaphorical expression may not be equally salient across cultures. (à ¢Ã¢â€š ¬Ã‚ ¦) Meanwhile, few researches have been introduced on the cultural features in the present study that lead Boers and Stengers to investigate on the composition of idiom and culture. They explore weather domain that track most in English figurative idioms. The weather domain is commonly associated to English figurative idioms because talking about the weather is a very basic and frequently topic in Britain because it is notoriously variable and unpredictable. However, the weather lexical units can be implemented through meaning extension to other domains such as economy and feeling, for example, when a financial storm struck down Wall Street, traders sought shelter in the dollar and Alex feels the chill of economic downturn. As result, the sentence illustrates the weather domain to a situation and feeling to indicate the seriousness on how Englishmen see weather as well as the economic phenomena. Boers, Demecheleer, and Eyckmans suggest that there are two complementary methods to estimate the two linguistic communities differ with respect to relate salience of a source domain. One method is to investigate the comparison of both languages such as English and Dutch idioms, that English idioms has much broader selection of expressions converted from card games and gambling such as to over play ones hand, to play with stacked deck, the chips are downà ¢Ã¢â€š ¬Ã‚ ¦ Another much more straight forward example is the domain of sports, popularity of certain sports may coin widely across cultural aspects. Baseball for instance, is much more popular in the United States than in European, for sure it is evidently that American produces more baseball figurative expression such as I had a date with Alice yesterday night, unfortunately I cant even get to first base with her; Three strike and youre out. Similarity, British English hold a source domain in cricket such as Bat on a sticky wicket, Hit someone for six. Besides, Englishmen also like to have horse racing eventually contributes to figurative expressions as well such as A dark horse, Hear it from the horse mouth. The another method is to detect cross-cultural variation done by researcher Alice Deignan results that the source domain of sailing is reflected more often in English than in French discourse. For examples, running tight ship, talking the wind out of someones sails, when you ship comes in, clear the decks, and many more. Boers and Demecheleer suggests that French figurative discourse is more likely flavoured by the source domain of food and cooking. Alice Deignan concludes that the cultural aspects and figurative idioms are considered indirect ones in the sense that cultures of the past and present reflect most of idioms and Boers sums up that even native speakers lack of awareness towards the origin of the idiom they use. 2.3) Origins of English Figurative Idioms According to Smith (1971), generally universal origins of idioms can be divided into six main cultural aspects. 2.3.1) From daily life Smith suggests that most idioms develop from daily life are linked with particular occupations such as many phrases that related to navy have been invented by the sailors as well as the athletes use phrases related to sports. Most of the idioms were invented and they are concise, oral dialect and vivid, and are closely associated to our life. Soon enough those idioms were used by the people in the daily life to indicate certain expressions. Such figurative expressions are useful and eventually it has been evolved from common dialogue to conventional language which those idioms are commonly use such as to share and woe, strike the iron whole it is hot, a pot of money, to take the bread out of someones mouth and many more. 2.3.2) From ancient myths, legends and fables Some English figurative idioms were influenced by the Ancient Greek and Roman civilization. From example, idioms such as Midas touch, the apple of discord, sour grape, pandoras box, trojon horse, etc are derived from Greek myths and legends which are widely used in writing. 2.3.3) From religion Religion stands an important role in contributing the source of idioms. In early western countries, traditionally, Christianity has always been the main religion, many sources of idioms are regularly used in verbal dialogue are mainly came from the bible such as judass kiss, olive branch, much cry and little wool, turn the other cheek, cast peals before swine, and writing on the wall. 2.3.4) From classical literature Apart from the religion contributes most of the source of idioms, classical literature is indentified as a main source of idioms. During Renaissance period, Shakespeares master pieces have been on e of the most important source of idioms in English language. For examples, pound of life, give the devil his due all come from Shakespeares plays. Besides, the famous Greek epic poem the Iliad also gives numerous contributions to the English idioms such as screw up ones courage, Achilles heel. In addition, one of the most famous English idioms the ugly duckling is from the Andersons fairy tales. 2.3.5) Form occupation Nevertheless, idioms are not only formed by social daily interaction, religions, historical background, and literature works, but also certain idioms are associated by the occupation as well. The United Kingdom is a country with high capability in sailing around the world, therefore, they are many idioms that related to navy such as ships in the night, to rock the boat, plain sailing and carry too much guns. Thus contrary, China is a large nation with agricultural aspects of production and process which have become the centralization of forming idioms that related to agricultural elements and those idioms have been passing on by farmers from generation to generation. 2.3.6) From Sports Sports domain also demonstrates the important source of idioms. Liu discusses that most of the English figurative idioms in American are derived from sports, business, and driving. However, the Chinese idioms are more likely from eating, family, and Chinese opera ultimately play and important roles in Chinese society that have pluralized many figurative idioms. United States has shown there are more baseball- based figurative idioms such as first base, three strike and youre out, while cricket is more popular in United Kingdom that formed their English figurative idioms such as bat on a sticky wicket, hit someone for six, etc. As result, these six types of domains can trace the origin of idioms which have a very specific cultural context.

The Guardian vs. The Mirror :: Papers

The Guardian vs. The Mirror I am doing an investigation into the statistical differences between the daily tabloid newspapers, and the weekly broadsheet newspapers. My overall hypothesis is that the daily tabloid papers - here represented by the Saturday edition of The Mirror, a daily tabloid - make an easier read than the more comprehensive broadsheet - here represented by the Guardian, a weekly broadsheet - To reach a conclusion, I plan to test three hypothesise in specific area. I will use a range of sampling methods, and presentation of data, in order to form valid conclusions. Planning 1 - My hypothesis is that the number of letters per word will be greater in the Guardian than in the Mirror. Number of letters - I will count the number of letters in every fourth word. In order to make my calculations accurate enough to reach a valid conclusion, I must collect a minimum of twenty pieces of data from each newspaper. I was planning to collect data from fourth word, in the first sentence on each page. However, if my second hypothesis is correct, then the sentences in the Guardian will be longer than those in The Mirror. This would corrupt the results, as some would be more accurate than others. So, I have decided to take the fourth and the eighth word from the first article on each page. The sections of each paper I have chosen are twenty-five pages long, so this will provide more than enough data to support any conclusion I reach, and should incorporate all sections of each newspaper. I will display my results in a data frequency chart. Then I will use averages and histograms, to compare the results and draw my conclusion. 2 - My second hypothesis is that the number of words per sentence will be fewer in The Mirror than in the Guardian. Number of words - I'll count the number of words in the first sentence, on each page. In order to make my calculations accurate enough to reach a valid

Freeport, Bahamas :: essays research papers

For those who like to relax, fish, water sports like snorkeling and jet skiing, I have the perfect place- Freeport, Bahamas is divided into sections that represent different parts of the world, each with its own collection of shops and restaurants. Blessed with the perfect location, less than 100 miles off the coast of Florida; the perfect climate, averaging a little over 75 degrees; and the perfect environment, with crystal clear turquoise blue waters and pearly white sandy beaches. Because the weather is warm all year, makes Freeport a great spot for tourism. I went there for spring break to get away from the cold weather of Chicago. I could not imagine at the time how relaxing a place could be. I received an invitation to go from my girlfriend, she told me that her cousin family had a time share there and invited her along and told her she could invite someone of her own. The Florida natives call these tourists "Snowbird" or "blue-hairs." Th ese tourists really do earn these unsavory titles because they all drive five miles an hour. This makes the locals crazy. After the snowbirds leave, all of the summer tourists arrive. These are usually families driving mini-vans with ten bratty kids wh o are all out of school for the summer. Just imagine that you are sitting on the beach, smelling the salt air, and feeling the cool breeze. The sun is slowly melting into the ocean and the sky is the shade of bright purple that can only be seen at dusk. It has been a long, hot day in the sun, and it feels nice to finally let it end. This is what living in Freeport, Bahamas is all about. The resort has only two chalets, each one situated on one side of the lake. There are many tow-days contests taking place here. The participants are from many different countries and they come here to have fun and do what they like and know best: extreme ski and snowboard. Snowboard is relatively a new extreme sport in Romania, but there already are many kids who practice it. Parties where everyone is having a good time and creating a friendly atmosphere, one would say specific to this place follow the contests. The party lasts till late in the night, when a peaceful silence covers the mountains.