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Dynamic Transducer for Sound A dynamic transducer is a coil-and-magnet device that translates mechanical vibration into varying electrical current, and can also do the reverse The most common examples are the dynamic microphone and the dynamic speaker Figure 30-1 shows a functional diagram of a dynamic transducer A diaphragm is attached to a coil that is mounted so it can move back and forth rapidly along its axis A permanent magnet is placed inside the coil Sound waves cause the diaphragm to move; this moves the coil, which causes fluctuations in the magnetic field within the coil The result is ac output from the coil, having the same waveform as the sound waves that strike the diaphragm If an audio signal is applied to the coil, it generates a magnetic field that produces forces on the coil This causes the coil to move, pushing the diaphragm back and forth, creating acoustic waves in the surrounding medium Electrostatic Transducer for Sound An electrostatic transducer takes advantage of the forces produced by electric fields Two metal plates, one flexible and the other rigid, are placed parallel to each other and close together (Fig 30-2) In an electrostatic pickup, incoming sound waves vibrate the flexible plate This produces small, rapid changes in the spacing, and therefore the capacitance, between the two plates A dc voltage is

Kerberos is an involved authentication protocol developed at MIT. Microsoft s implementation of Kerberos debuted with the advent of Active Directory (AD) in Windows Server 2000. There are many detailed Knowledge Base articles, white papers, blogs, and webcasts on the subject. Many of these resources are referenced at the end of the chapter if you need a more detailed explanation of Kerberos delegation. This section focuses on what you need to understand before you talk with your Windows admin, so that you can get her support and cooperation in implementing a Kerberos delegation solution.

If the number of documents is already 5 or more, the condition evaluates as false and the code inside the loop doesn t run at all

Microsoft Product Support Services has indicated that when troubleshooting Kerberos delegation issues with customers, the bulk of problems commonly revolves around service principle names (SPNs). An SPN is a registration in Active Directory that enables the user to locate a service in an Active Directory domain. The SPN is made up of a few basic parts:

applied between the plates As the interplate capacitance varies, the electric field intensity between them fluctuates This produces variations in the current through the primary winding of the transformer Audio signals appear across the secondary In an electrostatic emitter, fluctuating currents in the transformer produce changes in the voltage between the plates This results in electrostatic field variations, pulling and pushing the flexible plate in and out The motion of the flexible plate produces sound waves Electrostatic transducers can be used in most applications where dynamic transducers are employed Advantages of electrostatic transducers include light weight and good sensitivity The relative absence of magnetic fields can also be an asset in certain situations

In this example, you create a script that uses a repeat while loop to make sure the user enters a code in the dialog box (see Figure 9-2) that prompts him or her for it This example is simplistic, in that you would normally check the code further (for example, to make sure that it s valid, or at least that it s the right length), but it lets you put the repeat while loop into action Follow these steps to create the script:

1 2 3 4

The service being provided The computer hosting the service The port number (if you aren t using the service s default port) The user or computer account context that the service is running

Piezoelectric Transducer for Sound and Ultrasound Figure 30-3 shows a piezoelectric transducer This device consists of a crystal of quartz or ceramic material, sandwiched between two metal plates When sound waves strike one or both of the plates, the metal vibrates This vibration is transferred to the crystal The crystal generates weak electric currents when subjected to this mechanical stress Therefore, an ac voltage develops between the two metal plates, with a waveform similar to that of the sound If an ac signal is applied to the plates, it causes the crystal to vibrate in sync with the current The metal plates vibrate also, producing an acoustic disturbance Piezoelectric transducers can function at higher frequencies than can dynamic or electrostatic transducers For this reason, they are favored in ultrasonic applications, such as intrusion detectors and alarms

1 In AppleScript Editor, press z-N or choose File | New to create a new script 2 Type a set statement that declares a variable named employee_code and sets its value

Now that we have an idea what an SPN is, let s look at the ones we ll need to create. Someone with Domain Admin or Enterprise Admin privileges creates an SPN by using

setspn.exe. Setspn ships with Windows Server 2008, but for Windows Server 2003 it s part of the Windows Server 2003 Service Pack 2 32-bit Support Tools package, which is available from http://www.microsoft.com/downloads.

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I don t provide the direct link to the support tools mentioned in this section because they would be long hyperlinks, and when new service packs come out in the future, it s best you use the latest files. Use the search bar /www.micosoft.com/Downloads to find the most upat the top of http:/ to-date version for your edition of Windows Server 2003.