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Hold-on control

The effect of the disturbance on the controlled variable These models can be based on steady-state or dynamic analysis. The performance of the feedforward controller depends on the accuracy of both models. If the models are exac t, then feedforward control offers the potential of perfect control (i.e., holding the controlled variable precisely at the set point at all times because of the abihty to predict the appropriate control ac tion). However, since most mathematical models are only approximate and since not all disturbances are measurable, it is standara prac tice to utilize feedforward control in conjunction with feedback control. Table 8-5 lists the relative advantages and disadvantages of feedforward and feedback control. By combining the two control methods, the strengths of both schemes can be utilized. [Pg.730]

The control transformer to be selected may have a rating nearest to the maximum hold-on VA burden so calculated and must be suitable to feed the required inrush current at the p.f. so calculated without affecting its regulation.. So long as these two points fall below the inrush curve of the control transformer, its regulation... [Pg.467]

While the above comparison (or similar comparisons for other oxidants) of the amount of oxidant required for different oxidants may hold under controlled laboratory conditions, the actual amount and type of oxidant that is necessary for the treatment of MTBE or other oxygenates at a given site will depend on numerous factors beyond the amount of contaminant present including... [Pg.1025]

The New Order for France" demanded a secret Farben hold on all patents. They were bidding, without any stretch of imagination, to control the economy of the whole continent. They could grab a process, register it secretly, release its benefits as they pleased. Upon the patent would depend the granting of licenses. On licenses would depend the flow of goods between countries. [Pg.293]

To put oneself in an emeritus, or no-responsibility role, is more difficult for some than for others. Many fail. For example, some individuals (perhaps without knowing it) mess up their retirement years by holding on to family responsibilities to fill a void that they cannot fill from normal retirement activities. Others continue to provide unneeded emotional and financial support to maintain control. Still others fear that if they do not continue to provide support (whatever form it may take), they will lose their children s love—which may or may not be there in the first place. [Pg.168]

There is also heightened concern that a bioterrorist could release smallpox, a disease that has been eradicated from the globe since at least 1980. Officially, only two places on Earth still maintain viable smallpox virus in cold storage Novosibirsk, Russia and Atlanta, Georgia, at the Centers for Disease Control and Prevention (CDC). Some unconfirmed reports allege that other countries, however, including North Korea and perhaps others, still hold on to smallpox virus specimens. Could a terrorist release smallpox, and how would it affect a mostly immunologically naive population ... [Pg.376]

Bicycloheptene I was found to rearrange to II at 307° with greater than 95% stereoselectivity to the predicted exo-l-d II. This rearrangement, of course, requires rotation about the C-6—C-7 bond as carbon-7 moves across the face of the cyclopentene ring to carbon-3. The stereo-chemically more comfortable path (no rotation about the C-6—C-7 bond) is symmetry-forbidden. That the rearrangement proceeds with a methylene rotation in preference to the smooth, unhindered 1,3-migration illustrates the depth of control that molecular orbital symmetry conservation holds on transforming molecules. [Pg.294]

Spectroscopic data obtained from spectroelectrochemical experiments require careful and case-specific analysis. The Fe /Fe redox couple has a unique role in diflferent iron-containing proteins. It is hypothesised that the mammalian iron-transport protein transferrin uses the Fe /Fe redox couple as a switch that controls the time and site-specific release of iron, while other iron-containing proteins, such as myoglobin, are able to hold on to iron in both oxidation states. Therefore, it is very important to evaluate the protein and its interaction with both the oxidised and reduced states of iron and accordingly develop a data-analysis model. The spectroelectrochemical response of an iron binding protein can be ideal Nernstian, non-Nernstian resulting from coupled... [Pg.38]

Conjunction The past has a strong hold on you. You may suffer from self-doubt as a result of a less-than-warm relationship with your mother. Fortunately, you wield the weapon of self-control. Common sense helps you focus your feelings in a positive way. [Pg.182]

Non-adjacent sets of data can be entered at the wizard window offering confirmation of the ranges of cells with data for the chart. Click on the right black arrow, select the first set of data, hold the control button down and select the other sets. If you know the end cell address, simply select a few cells, then amend the last address to the proper one, which procedure avoids the need to select over large areas. [Pg.6]


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See also in sourсe #XX -- [ Pg.183 ]

See also in sourсe #XX -- [ Pg.180 ]




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