History contributions

The examination of individual NP case studies by other investigators, as well as summary results of our pilot research, suggest at least two clinically distinct populations. One subsample of PCP abusers has a developmental history of prenatal and birth complications, e.g., prematurity, anoxia at birth, or low APGAR scores, and of early childhood factors, e.g., CHI with loss of consciousness, febrile illnesses with or without convulsions, or chronic ear infections. These histories contribute to developmental learning and performance disorders. In this group, LD causes academic failure and frustrations, which in turn contribute to the development of psychological and interpersonal problems. 

As noted above, added mass and history contributions can be neglected for large 7, especially at high Re or Rqjs- The motion is then of Type 2, with the fluid responding rapidly to changes in particle velocity. If the history term is neglected and y 1, Eq. (11-33) becomes... 

Note that in this equation t has become the fixed time of the observation of the strain and, for the purposes of integration, can be regarded as a constant. The stress history is accounted for in terms of the dummy integration variable s. The lower limit of integration is taken as -qo, because the complete stress history contributes to the observed strain. The upper limit is t, the time of observation of the strain, because stresses applied after t can have no effect on the observed strain. 

I-beam interference can be just as troublesome in the space above a chimney tray. In one case history contributed by D. W. Reay (334), this interference is believed to have led to severe vapor maldistribution in a refinery vacuum tower (Fig. 8.66). The maldistributed vapor profile was displayed as a carbon deposit on the siuTace of the bottom packing. The deposit formed an annular ring about 5 ft wide that extended about 1 in into the bed. In that case, liquid was known to overflow the chimneys for several months because of an incorrect location of level tappings. This overflow caused liquid entrainment. Some entrained droplets ultimately carbonized on the base of the bed. Had the vapor profile been uniform, entrainment (and therefore deposit laydown) would have been more uniform. It is believed that vapor from the side chimneys was blocked by the beams and preferentially ascended around the periphery. If liquid overflow (down the risers) had been uneven, the maldistribution could have been further aggravated. 

One case history contributed by J. A. Hatfield (1515) describes a methanol-water column, reboiled by live steam injection, which used a non-MB control scheme. The scheme was the same as those in Fig. 16.4a or 5, but there was no automatic temperature control and both steaun injection and reflux were flow-controlled. The operators manually adjusted the set point of these flow controllers to suit a tray temperature. The system performed poorly and the column expereienced upsets and off-spec products. Changing the system to scheme 16.4d eliminated the problems and gave excellent control. 

The most commonly used model is the Boltzmann superposition principle, which proposes that for a linear viscoelastic material the entire loading history contributes to the strain response, and the latter is simply given by the algebraic sum of the strains due to each step in the load. The principle may be expressed as follows. If an equation for the strain is obtained as a function of time under a constant stress, then the modulus as a function of time may be expressed as... 

The lower limit of the summation is taken as — oo since the entire stress history contributes to the response. 

Equation 1 further predicts that the stress depression is independent of strain. As seen in Figure 8, hard elastic polypropylene obeys this relationship (the raw stress depression values were also approximately constant). For hard elastic HIPS under high tension the stress depressions are independent of strain. Below about 25% elongation, however, the stress depression decreases with strain. The effect may be due to a larger fibril diameter at low strains, or an increase in the volume fraction of the fibril phase with elongation. Again, the differences in process history contribute greatly to the differences in strain response. 

Because of technological developments in psycho-photonics, though they are dead, echoes of their life forces can be funneled from the ether (to whence their spirits were dispersed when they died) and enter those holograms. Thus your dead family members can guide you on the code of honor of a warrior and even give you tactical advice. (Note how history contributes to gameplay.)... 

That s because Telan Ku, the founder of their order five centuries ago, discovered Sentia, a form of metal that, like plants, is nurtured by sunlight. He forged the first bio-guns that have been a staple of soldiers ever since. No non-soldier is allowed to own anything made of Sentia. Some of your missions therefore involve protecting the Sentia mines. (Note how history contributes to gameplay.)... 

It s the tradition here for small children to offer soldiers chocolate and bullets. When you shoot a bullet given to you by a child, you can faintly hear children s innocent laughter after it slams into an enemy. (Note how history contributes to gameplay.)... 

There s a well outside of town. In his first major defeat, Ku lost his son and his two closest friends. It is said that he went to that well and cried. When you dip you special sword in that well, it becomes super-charged for awhile. You can move it so fast that you can even use it to stop bullets. (Note how history contributes to gameplay.)... 

Furthermore, the path of his wanderings is marked with guide stones. When you stay on that path, you re much more impervious to weapons wielded by your enemy. (Note how details and history contribute to gameplay.)... 

As Sean O Keefe wrote in his op-ed piece, the Columbia Accident Investigation Board found that NASA s culture and related history contributed as much to the Columbia accident as any technical failure. After a six-month investigation, the board reported the following ... 

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