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Although you could provide a different logical view of your physical data tables using LINQ to SQL, there is more of an expectation that your LINQ to SQL objects will more closely resemble the underlying database tables. LINQ to SQL includes a tool, the Object Relational (O/R) Designer, which will assist us in creating the go-between classes. You can take a quick peek at Figure 17-2 to see what it looks like, but I warn you, it s no Rembrandt. Still, it does a respectable job at making the needed database link. The O/R Designer is drag-and-drop simple, and is suitable for databases that aren t too terribly large. If you need to create the link classes for a database that has, say, hundreds of tables, you should read up on the SqlMetal.exe tool that comes with Visual Studio. You ll find full details in the MSDN documentation that comes with Visual Studio. Using LINQ to SQL is done in five easy steps. You can follow along in a new Windows Forms project if you want: 1. Add a new dbml file. This file actually, a few files that Visual Studio displays as one describes your data context, the master class that contains link code for each database table that you will use in your application. To create this file from a Visual Studio project, use the Project Add New Item menu command to display the Add New Item form. From the Data category, select the LINQ to SQL Classes template, change the name of the file to Library.dbml from the default, and click the Add button (see Figure 17-1).

In the power cycles so far considered the high-temperature, high-pressure gas expands in a turbine (steam power plant, gas turbine) or in the cylinders of an Otto or Diesel engine with reciprocating pistons In either case, the power becomes available through a rotating shaft Another device for expanding the hot gases is a nozzle Here the power is available as kinetic energy in the jet of exhaust gases leaving the nozzle The entire power plant, consisting of a compression device and a combustion chamber, as well as a nozzle, is known as a jet engine Since the kinetic energy of the exhaust gases is directly available for propelling the engine and its attachments, jet engines are most commonly used to power aircraft There are several types of jet-propulsion engines based on different ways of accomplishing the compression and expansion processes Since the air striking the engine has kinetic energy (with respect to the engine), its pressure may be increased in a diffuser The turbojet engine (usually called simply a jet engine) illustrated in Fig 813 takes advantage of a diffuser to reduce the work of compression The axial-flow compressor completes the job of compression, and then the fuel is injected and burned in the combustion chamber The hot combustion-product gases first pass through a turbine where the expansion provides just enough power to drive the compressor The remainder of the expansion to the exhaust pressure is accomplished in the nozzle Here, the velocity of the gases with respect to the engine is increased to a level above that of the entering air This increase in velocity provides a thrust

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(force) on the engine in the forward direction If the compression and expansion processes are adiabatic and reversible, the turbojet-engine cycle is identical to the ideal gas turbine cycle shown in Fig 812 The only differences are that, physically, the compression and expansion steps are carried out in devices of different types A rocket engine differs from a jet engine in that the oxidizing agent is carried with the engine Instead of depending on the surrounding air for burning the fuel, the rocket is selfcontained This means that the rocket can operate in a vacuum such as in outer space In fact, the performance is better in a vacuum, because no 'thrust' is required to overcome friction forces In rockets burning liquid fuels the oxidizing agent (eg, liquid oxygen) is pumped from tanks into the combustion chamber Simultaneously,fuel (eg, hydrogen, kerosene) is pumped into the chamber and burned The combustion takes place at a constant high pressure and produces high-temperatureproduct gases that are expanded in a nozzle, as indicated in Fig 814 In rockets burning solid fuels the fuel (organic polymers) and oxidizer (eg, ammonium perchlorate) are contained together in a solid matrix and stored at the forward end of the combustion chamber

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