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An Example of Zo in Practice In rigorous terms, the ideal characteristic impedance for a transmission line is determined according to the nature of the load with which the line works For a system having a purely resistive impedance of a certain number of ohms, the best line Zo value is that same number of ohms If the load impedance is much different from the characteristic impedance of the transmission line, excessive power is wasted in heating up the transmission line Imagine that you have a so-called 300- frequency-modulation (FM) receiving antenna, such as the folded-dipole type that you can mount indoors Suppose that you want the best possible reception Of course, you should choose a good location for the antenna You should make sure that the transmission line between your radio and the antenna is as short as possible But you should also be sure that you purchase 300- TV ribbon It has a value of Zo that has been optimized for use with antennas whose impedances are close to 300 + j0

Table 3-6

In general, employers in information fields regard the possession of specific skills a more important qualification than educational background Such skills as written and verbal communications, work experience, and knowledge of both the functions of the business and the technology used in the company are very important This is not to say that grade point average and course work are not scrutinized also The point is that most employers care more about what you can do for their company than what you know, so in both the resume and the interview, job seekers should focus on the skills they possess and the value of these skills to the company College students can gain marketable experience through internships, part-time jobs, and involvement in campus activities

Now that we have an XMLHttpRequest object, what do we do with it You can start by opening it, which lets you configure it in preparation for connecting to the server and downloading data

Impedance matching is the process of making sure that the impedance of a load (such as an antenna) is purely resistive, with an ohmic value equal to the characteristic impedance of the transmission line connected to it This concept will be discussed in more detail in the next chapter

When ajaxhtml first loads in the browser, it tries to create an XMLHttpRequest object When the user clicks the button to fetch data from the server using Ajax, the getData function is called, and the first thing it does is check whether an XMLHttpRequest object was created successfully:

In an ac circuit, electrical conductance works the same way as it does in a dc circuit Conductance is symbolized by the capital letter G It was introduced in Chap 2 The relationship between conductance and resistance is simple: G = 1/R The standard unit of conductance is the siemens The larger the value of conductance, the smaller the resistance, and the more current will flow Conversely, the smaller the value of G, the greater the value of R, and the less current will flow

<script language = "javascript"> var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } function getData(dataSource, divID) { if(XMLHttpRequestObject) { } } </script>