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When you re using the make command to create a folder, you also use the with properties parameter to provide essential information for the folder you re creating The essential nugget of information you need to give AppleScript is the name item If you don t provide a name for the new folder, Mac OS X obligingly gives it the default name of untitled folder for you (If that name is already taken which does happen, especially if you mess around with scripts Mac OS X uses untitled folder 2, untitled folder 3, or the next available name) The following example creates a folder named Test Folder on the Desktop:

.

Summary

This example creates a folder named Sample Files within the Temp subfolder of the user s Documents folder The Documents folder is a standard Mac OS X system folder, but you will need to create the Temp subfolder (or verify that it already exists) if you want to make this example work on your Mac

PowerShell is an automation engine Microsoft is now building into all of its major products. The data in SQL Server can be accessed using scripts or cmdlets shipping with SQL Server 2008. SMO-based scripts can be used to administer all versions since SQL Server 2000. PowerShell providers enable us to administer and configure SQL Server. The new policy management features can also be accessed from PowerShell.

Weak-Signal Amplifiers versus Power Amplifiers Some RF amplifiers are designed for weak-signal work The front end, or first amplifying stage, of a radio receiver requires the most sensitive possible amplifier Sensitivity is determined by two factors: the gain, which has already been discussed here, and the noise figure, a measure of how well a circuit can amplify desired signals while generating a minimum of electronic noise All bipolar transistors or FETs create some white noise because of the movement of the charge carriers among the atoms In general, JFETs produce less noise than bipolar transistors Gallium arsenide FETs, also called GaAsFETs (pronounced gasfets ), are the least noisy of all The higher the frequency at which a weak-signal amplifier is designed, the more important the noise figure gets This is because there is less atmospheric noise at the higher radio frequencies, as compared with the lower frequencies At 18 MHz, for example, the airwaves contain much atmospheric noise, and it doesn t make any difference if the receiver introduces a little noise itself But at 18 GHz, atmospheric noise is almost nonexistent, and receiver performance depends critically on the amount of internally generated noise Weak-signal amplifiers almost always use resonant circuits This optimizes the amplification at the desired frequency, while helping to cut out noise on unwanted frequencies A typical tuned GaAsFET weak-signal RF amplifier is diagrammed in Fig 24-9 It is designed for operation at about 10 MHz Broadband PAs At RF, a PA can be either broadband or tuned The main advantage of a broadband PA is ease of operation, because it does not need tuning The operator need not worry about critical adjustments, nor bother to change them when changing the frequency However, broadband PAs are slightly less efficient than tuned PAs Another disadvantage of broadband PAs is the fact that they will amplify any signal in the design frequency range, whether or not this is desired For example, if some earlier stage in a radio transmitter is oscillating at a frequency different from the intended signal frequency, and if this undesired energy falls within the design frequency range of the broadband PA, it will be amplified The result will be unintended RF emission from the radio transmitter Such unwanted signals are called spurious emissions Figure 24-10 is a schematic diagram of a typical broadband PA The NPN bipolar transistor is a power transistor It will reliably provide several watts of continuous RF power output over a range of frequencies from 15 MHz through 15 MHz The transformers are a critical part of this circuit They must be designed to work efficiently over a 10:1 range of frequencies Tuned PAs A tuned RF power amplifier offers improved efficiency compared with broadband designs Also, the tuning helps to reduce the chances of spurious signals being amplified and transmitted over the air Another advantage of tuned PAs is that they can work into a wide range of load impedances In ad-.