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greater weight to an area in the center of the viewfinder that makes up about 10 percent of the entire frame. Spot metering concentrates on an even smaller area about 1 to 2 percent dead in the middle of the viewfinder for precision metering when it s important that the exposure match exactly a specific part of your subject matter. For example, you may decide that it s crucial to get the highlight from a model s hair exactly right, and all other light in the frame is subservient to the hair lighting.

chemical equation shows that as a chemical reaction takes place, reactants are changed into products. The reaction rate of a chemical reaction is often expressed as the change in concentration of a reactant or a product in a unit amount of time. In this activity, the reaction rate will be calculated from the amount of time it takes for a given amount of magnesium (Mg) to react completely with hydrochloric acid (HCl).

These factors do force users to select passwords that are less easy to guess; however, in doing so they also tend to increase the likelihood of users forgetting passwords. Users typically respond to forced password rotations by devising a family of similar passwords to circumvent the annoyance of having to remember five different passwords, particularly if they are all used for the same system. Conventional password policies operate by placing additional burdens on administrators and (presumably) valid users, and in some cases the extra burdens have no measurable benefit. While it is obviously desirable to change the password for a user whose password is known to have been compromised, the benefit of changing pass-

print 'Content-Type: text/plain' print '' print 'Here's Johnny!'

When an event handler is added, add is called and a reference to the handler (contained in value) is put into the first unused (that is, null) element of evnt. If no element is free, then an error is reported. (Of course, throwing an exception when the list is full would be a better approach for real-world code.) Since evnt is only three elements long, only three event handlers can be stored. When an event handler is removed, remove is called and the evnt array is searched for the reference to the handler passed in value. If it is found, its element in the array is assigned null, thus removing the handler from the list. When an event is raised, OnSomeEvent( ) is called. It cycles through the evnt array, calling each event handler in turn. As the preceding example shows, it is relatively easy to implement a custom eventhandler storage mechanism if one is needed. For most applications, though, the default storage provided by the non-accessor form of event is better. The accessor-based form of event can be useful in certain specialized situations, however. For example, if you have a program in which event handlers need to be executed in order of their priority and not in the order in which they are added to the chain, then you could use a priority queue to store the handlers.

For composite beams, plastic hinges form at midspan and for continuous beams at supports. Visible tension yielding occurs in the bottom ange and at the continuous supports at the top ange accompanied by cracking at the surface of the slab. In prestressed concrete beams, collapse may occur due to principal tensile stress at anchorages or breakage of the corroded strands.

DMT uses multiple narrow band carriers, all transmitting simultaneously in a parallel transmission mode. Each of these carriers carries a portion of the information being transmitted. These multiple discrete bands, or in the world of frequency division multiplexing, subchannels, are modulated independently of each other using a carrier frequency located in the center of the frequency being used. These carriers are then processed in parallel form. In order to process the multicarrier frequencies at the same time, a lot of digital processing is required. In the past, this was not economically feasible, but integrated circuitry has made this more feasible. The American National Standards Institute (ANSI) selected DMT with the use of 256 subcarriers, each with the standard 4.3125 kHz bandwidth. These subcarriers can be independently modulated with a maximum of 15 bits/second/Hz. This allows up to 60 Kbps per tone used. Figure 16-5 shows the use of the frequency spectrum for the combination of voice and two-way data transmission. In this representation, voice is used in the normal 0 4 kHz band on the lower end of the spectrum (although the lower 20 kHz are provided). Separation is allowed between the voice channel and the upstream data communications, which operates between 20 kHz and 130 kHz. Then a separation is allowed between the upstream and the downstream channels. The downstream flow uses between 140 kHz and 1 MHz. As shown in this drawing, the separation allows for the simultaneous up and down streams and the concurrent voice channel. It is on this spectrum that the data rates are sustained. Each of the subchannels operates at approximately 4.3125 kHz and a separation of 4.3125 kHz between channels is allocated.

FIGURE 24-4

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Support for unicast, multicast, and broadcast traffic Multiple (three) classes of service Increase usable bandwidth beyond those of existing technologies Provide weighted fairness between all the stations on the ring Automatic topology and station discovery and capability for plug and play Robust frame transmission:

You could have stopped sooner, expressing only one thought. This approach would create a sixteen-word sentence:

Figure 6-49 The Data Point Attributes dialog box allows users to assign colors and shapes to various dimension members.