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How the Junction Works When the N-type material is negative with respect to the P type, as in Fig 19-4A, electrons flow easily from N to P The N-type semiconductor, which already has an excess of electrons, receives more; the P-type semiconductor, with a shortage of electrons, has some more taken away The N-type material constantly feeds electrons to the P type in an attempt to create an electron balance, and the battery or power supply keeps robbing electrons from the P-type material This condition is illustrated in Fig 19-5A, and is known as forward bias Current can flow through the diode easily under these circumstances When the battery or dc power-supply polarity is switched so the N-type material is positive with respect to the P type, the situation is called reverse bias Electrons in the N-type material are pulled toward the positive charge pole, away from the P-N junction In the P-type material, holes are pulled toward the negative charge pole, also away from the P-N junction The electrons are the majority carriers in the N-type material, and the holes are the majority carriers in the P-type material The charge therefore becomes depleted in the vicinity of the P-N junction, and on both sides of it, as shown in Fig 19-5B This zone, where majority carriers are deficient, is called the depletion region A shortage of majority carriers in any semiconductor substance means that the substance cannot conduct well Thus, the depletion region acts like an electrical insulator This is why a semiconductor diode will not normally conduct when it is reverse-biased A diode is, in effect, a one-way current gate usually! Junction Capacitance Some P-N junctions can alternate between conduction (in forward bias) and nonconduction (in reverse bias) millions or billions of times per second Other junctions are slower The main limiting.

20050213075957/www.gate.net/~ddata/utilities/simil.c). This is the version I used as a starting point for the .NET implementation I m presenting here. The purpose of Simil is to calculate a similarity between two strings.

If your script needs to work with an object the user has selected in the active document, use the selection object For example, if you have the user select some text and then run a script to manipulate it, the script will need to work with the selection object You can also create your own selection by using the select command for example, your script may need to highlight text or another object so that the user can gaze on it with fascination or (more usefully) do something with it The selection object represents the selection or insertion point in the active document If something one or more characters, for example is selected, the selection object returns that selection; if nothing is selected, the selection is considered to be collapsed to an insertion point, and the selection object returns that instead

The Simil algorithm looks for the longest common substring, and then looks at the right and left remainders for the longest common substrings, and so on recursively until no more are found. It then returns the similarity as a value between 0 and 1, by dividing the sum of the lengths of the substrings by the lengths of the strings themselves. Table 1 shows an example for two spellings of the word Pennsylvania. The algorithm finds the largest common substrings lvan, and then repeats with the remaining strings until there are no further common substrings.

P-N junction At B, reverse bias of the same junction Solid black dots represent electrons White dots represent holes Arrows indicate direction of charge-carrier movement

Subtotal Length of original strings Simil = 16/24

Before you do anything to the selection, it s a good idea to check which kind of selection it is This helps you avoid awkward surprises, such as inserting text over priceless content that the user has selected, or trying to check the spelling of a non-text object Table 14-3 explains Word s different types of selections

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factor is the capacitance at the P-N junction during conditions of reverse bias As the junction capacitance of a diode increases, maximum frequency at which it can alternate between the conducting state and the nonconducting state decreases The junction capacitance of a diode depends on several factors, including the operating voltage, the type of semiconductor material, and the cross-sectional area of the P-N junction If you examine Fig 19-5B, you might get the idea that the depletion region, sandwiched between two semiconducting sections, can play a role similar to that of the dielectric in a capacitor This is true! In fact, a reverse-biased P-N junction actually is a capacitor Some semiconductor components, called varactor diodes, are manufactured with this property specifically in mind The junction capacitance of a diode can be varied by changing the reverse-bias voltage, because this voltage affects the width of the depletion region The greater the reverse voltage, the wider the depletion region gets, and the smaller the capacitance becomes