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term therefore applies a simple phase shift of ei N t to the field envelope E t , which in the frequency domain corresponds to a frequency translation of N . With a time-varying carrier density, the first term leads to so-called phase-amplitude coupling, where changes in the amplitude of the field cause changes in the carrier density which in turn lead to changes in the instantaneous frequency of the laser. We shall see later that this phase-amplitude coupling can be more explicitly accounted for through the use of the alpha factor . The second term in the E-field equation accounts for amplification through stimulated emission, quantified by the optical gain term G n , and for attenuation due to the cavity losses, 0 . The final term in the E-field equation is the important addition made by Lang and Kobayashi: the inclusion of the effect of the feedback of a time-delayed proportion of the optical field. The coupling coefficient is given by: = c 1 R2 R3 /R2 = 2 l (2.2)

Keyboards are conventional input devices. Microcomputer keyboards have all the keys that typewriter keyboards have plus others unique to computers. People who always thought typing was an overrated skill will find themselves slightly behind in the Digital Age, since learning to use a keyboard is still probably the most important way of interacting with a computer. Users who have to use the hunt-and-peck method waste a lot of time. Fortunately, there are software programs available that can help you learn to type or improve your typing skills. You are probably already familiar with a computer keyboard. As the use of computer keyboards has become widespread, so has the incidence of various hand and wrist injuries. Accordingly, keyboard manufacturers have been giving a lot of attention to ergonomics, which is the study of the physical relationships between people and their work environment. Various attempts are being made to make keyboards more ergonomically sound in order to prevent injuries.

From De nition 6.1 we see that if F1 and F2 are, respectively, the distribution functions for random variables X and X + c, where c is a constant, then d(F1 ,F2 ) = |c|. In fact, by the de nition of naturally induced random variables, we have F2 = F1 (t) + c in this case. If F1 is a distribution of a random variable X and F2 concentrates on a constant c, then by Lemma 6.1, [d(F1 ,F2 )]2 =

The exec call is standard. It causes the current program image for the process to be replaced by the executable file specified in the call. Other arguments specify the contents of the argv array (the command line arguments ) and, if desired, the envp environment vector. You can use the fork-exec calls to manipulate processes; you could even build a network-based server that combined these calls with socket accept calls. Usually, the simpler system call is sufficient for the kinds of tasks that you want a Perl program to offload onto a child process. Perl has an alternative to the basic system call. This backticks construct is essentially the same as system except that it allows the output from the child process to be captured by the calling program. When a child process is launched (via fork or system), it shares stdin, stdout and stderr with its parent process. As the parent process waits for the child, any output to stdout simply comes back to the terminal controlling the parent Perl process (if parent and child run concurrently, their outputs are intermingled). Sometimes what you want is for the parent Perl process to be able to process the child s outputs. So you can have a statement in a Perl program like:

The Higher Frequency the Radio Band the Greater the Capacity!

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Team members sometimes work on several projects simultaneously. Under these conditions, there may be conflicts among priorities, especially if they are working under different project managers. To minimize such conflicts, team members should be asked to let project managers know about scheduling conflicts in advance. Team members may then be reassigned to different tasks. Team members should be given detailed instructions, and participation should be encouraged from the beginning. Their input should be solicited. Let the members propose solutions and assist in implementation. Active participation will motivate the project team. When the ideas are good, the entire project benefits.

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10: Taken as Read: Teaching Reading Lessons ........................................... 139 11: Write or Wrong Teaching Writing Lessons.......................................... 157 12: What Accent Teaching Pronunciation.................................................. 171 13: Setting Their Tongues Wagging: Speaking and Discussion ................. 183 14: In One Ear, Out the Other: Learning To Listen ..................................... 195

Listing 1.19 An XSD Schema for the customer letter (CustomerLetter02.xsd). (Continued)