منابع مشابه
extensions of some polynomial inequalities to the polar derivative
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15 صفحه اولZiegler Wax Embryo Models
Three-dimensional anatomical models have long been essential to the learning of science and lend a sense of ?control? to those practicing in the field. As the development of embryology [4] grew in importance during the late 1800s, so did the need for models to show intricate details of embryos. Embryologists such as Wilhelm His [5], Ernst Haeckel [6], and Oscar Hertwig all initially constructed...
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A project of an expedition towards planet Venus, which is carried out in two stages, is considered. At the first stage, a space train, consisting of a locomotive and a tank with working substance, delivers onto Venus orbit the landing capsule with the Venus plane and the Venus rover, as well as the tank-container with liquid hydrogen, which is used subsequently for return of the expedition onto...
متن کاملFood intakes, energy expenditures and faecal excretions of men on a polar expedition.
The British North Greenland Expedition (Lewis & Masterton, 1955a, b) provided an opportunity to study the food intake and energy expenditure of men in a cold environment. The expedition, consisting of twenty-five men, left London on 8 July 1952 to spend 2 years in an unexplored area of mountains and glaciers situated some 800 miles from the North Pole. Their explorations included a geological a...
متن کاملSleep during an Antarctic summer expedition: new light on "polar insomnia".
Sleep complaints are consistently cited as the most prominent health and well-being problem in Arctic and Antarctic expeditions, without clear evidence to identify the causal mechanisms. The present investigation aimed at studying sleep and determining circadian regulation and mood during a 4-mo Antarctic summer expedition. All data collection was performed during the continuous illumination of...
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ژورنال
عنوان ژورنال: Nature
سال: 1908
ISSN: 0028-0836,1476-4687
DOI: 10.1038/077544b0