 497  recognized for many years and thermal conductivity measurements have been used mainly as indices of blood flow rather than absolute measurement of blood flow. For example, Hertzman et al making estimates of both local tissue perfusion and thermal conductance found these two correlated well with each other but not in a one-to-one ratio. 177. A large computer can easily keep thirty or forty programmers busy. Most of the senior programmers should be mathematical graduates, at any rate when the work is scientific rather then commercial. Some of them should be specialists in the branch of mathematics known as numerical analysis, while others should, if possible, have had previous experience in the particular field of science and technology from which the problems arise. 178. The transistors and diode specified are about the least expensive types on the market. Virtually any generalpurpose transistors and diodes should work as well, if they are more readily available. C10 and C11, as mentioned, extend the upper frequency limit and maintain amplitude at this limit. Their values may have to be altered somewhat for different transistors, even of the type ecommended. 179. In a supplementary test in which a sample of the same serum was incubated with the extract in a final dilution of 1: 10 instead of 1: 100, the divergence at pH 6.0 was even more pronounced. Cholesterol release in this case was essentially complete (33.1 mg per cent) after 1 hour of incubation, whereas, the opalescence produced amounted to only 0.30 optical density units, as compared to 0.5 for the corresponding mixture with the more dilute extract. 180. The guidance employed during the early powered flight of a space vehicle is referred to as injection, boost or ascent guidance. The techniques are almost the same as those used in the guidance of ballistic missiles and they are not described in this paper. Instead, the correction of space trajectories by small impulse-type manoeuvres is discussed, since injection guidance alone would not usually be sufficiently accurate for advanced space nissions. 181. Why are human beings born in a state so immature that it takes 8 to 10 months before the human infant can even crawl, and another 4 to 6 months before he can walk and talk? That a good many years will elapse before the human child will cease to depend upon others for his very survival constitutes yet another evidence of the fact that man is born and remains more immature for a longer period than any other animal. 497 |
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