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These equations are valid at the frequency fo for which the line length measures 1 4 wavelength Sometimes, the word wavelength is replaced by the lowercase Greek letter lambda ( ), so you will occasionally see the length of a quarter-wave section denoted as (1 4) or 025 Neglecting line losses, the preceding relations hold at all odd harmonics of fo, that is, at 3fo, 5fo, 7fo, and so on At other frequencies, a quarter-wave section of line does not act as a transformer Instead, it behaves in a complex manner that is beyond the scope of this discussion Quarter-wave transmission-line transformers are most often used in antenna systems, especially at the higher frequencies, where their dimensions become practical A quarter-wave matching section should be made using unbalanced line if the load is unbalanced, and balanced line if the load is balanced A disadvantage of quarter-wave sections is the fact that they work only at specific frequencies But this is often offset by the ease with which they are constructed, if radio equipment is to be used at only one frequency, or at odd-harmonic frequencies

Apart from internships, many students find part-time jobs that offer both pay and experience Though these jobs often pay minimum wage, this work experience is very important to prospective employers Former employers can give important recommendations for full-time jobs after graduation That an individual is reliable, works well with coworkers, and has initiative is what any prospective employer wants to hear Many on-campus jobs can be obtained through student financial aid and job-placement services On every college campus are job boards and campus newspapers listing job openings Graduate assistantships are available to qualified students Computer and information majors will get more than their share of these positions if they can show expertise with computers and communications technology even though some part-time jobs will be in data entry Any opportunity for work experience prior to graduation should be considered because of the strength it lends to the job search for that first, very important, full-time job

And he goes on: The name is shorthand for Asynchronous JavaScript + XML, and it represents a fundamental shift in what s possible on the Web Ajax isn t a technology It s really several technologies, each flourishing in its own right, coming together in powerful new ways Ajax incorporates:

Problem 18-5 Suppose an antenna has a purely resistive impedance of 100 It is connected to a 1 4-wave section of 75- coaxial cable What is the impedance at the input end of the section Use the formula from above:

standards-based presentation using XHTML and CSS; dynamic display and interaction using the Document Object Model; data interchange and manipulation using XML and XSLT; asynchronous data retrieval using XMLHttpRequest; and JavaScript binding everything together

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R in = Z o2/R out = 752/100 = 5625/100 = 56

In other words, Ajax is an umbrella term for techniques you use to make web applications look like desktop applications Here s how it works: In the browser, code written in a scripting language most frequently, JavaScript, which 2 is all about watches what information the user wants, such as what term they re searching for in Google Suggest When, or even before, the user needs that information, the JavaScript code communicates with the web server behind the scenes to fetch that information without causing a page refresh in the browser That is, the way Ajax fetches data from the server is invisible to the user The JavaScript code uses a special object built into the browser an XMLHttpRequest object to open a connection to the server and download data from the server That data is often in XML format (the x in Ajax stands for XML), but it can be just plain text, as you re going to see When the data that the user needs has been downloaded behind the scenes, the JavaScript code uses that data to update the display in the browser For example, in the earlier Google Suggest example, JavaScript was responsible for fetching, behind the scenes, the suggestions Google made and then displaying those suggestions in the drop-down list box after they were downloaded You re not restricted to using drop-down list boxes with Ajax You can do just about anything to display or report on the downloaded data, using JavaScript, because browsers support dynamic HTML, which means changes you make in the page are updated instantly in the browser without having to refresh the page You can update the text in the web page, for example, or change its size or color to bring the user s attention to new text You can chat with friends and have their comments appear in the web page in real time You can even use Ajax, together with dynamic HTML, to download and display images corresponding to the information the user wants For example, you might draw graphs of business stock performance on the server and then download and display them using Ajax and dynamic HTML all without a page refresh Imagine how cool that looks: the user can select the stocks they want to chart, and the graph on the page changes to match, all with the feel of a desktop, not Internet, application.