نتایج جستجو برای: century
تعداد نتایج: 112802 فیلتر نتایج به سال:
I became an undergraduate at Dartmouth College in 1933. The freshman course in physics was given by G.F. Hull who with E.L. Nichols, the founder of the Physical Review, was the first, with P. Lebedev in Russia to measure the pressure of light. (The world would learn sometime later about the diabolical importance of the pressure of light in enabling the hydrogen bomb.) Hull was a Canadian who ha...
In the century since Einstein’s anno mirabilis of 1905, our concept of the Universe has expanded from Kapteyn’s flattened disk of stars only 10 kpc across to an observed horizon about 30 Gpc across that is only a tiny fraction of an immensely large inflated bubble. The expansion of our knowledge about the Universe, both in the types of data and the sheer quantity of data, has been just as drama...
LEWIS THOMAS, The youngest science, Oxford University Press, 1983, 8vo, pp. viii, 276, £3.95 (paperback). Now in paperback, these are the reminiscences of the career of a successful, kindly, drily humorous, medical scientist. His most attractive trait is that of enjoyment. The son of a Flushing general practitioner, he moves through life, to Harvard, various residencies, Guam and Okinawa during...
Downloaded: 30 May 2012 IP address: 148.88.176.155 In his excellent introductory essay, Mayer not only discusses the theatrical history, nature, and function of the plays, but also their ideological significance both in Britain and America. He sees them as a response to many of the cultural and social anxieties of the age: the crisis of religious faith, the rise of feminism, the emergence of cl...
design of the first digital computer, in the hands of John Von Neumann, was strongly influenced by this work of 1943. Von Neumann himself rejected logic as the key to human thinking. Something much more like thermodynamics, he speculated, is needed. And in 1947—only just under half a century ago—Pitts and McCulloch published “How We Know Universals: The Perception of Auditory and Visual Forms.”...
The purpose of this volume is to provide a capsule view of the relationship of the behavioral and social sciences to pubIic health as we enter the 2 1st century. Historically, the genealogical tree of Western medicine often is traced to Hippucrates, who held a holistic concept of health and disease: “Health depends upon a state of equilibrium among the various internal factors which govern the ...
Every aspect of the accounting profession is being pervasively affected by advances in information technology (IT). IT shifts power from producers (such as accountants and auditors) to consumers (such as investors, creditors, and other information users). Present and potential users of accounting and auditing services have increasing needs for relevant, reliable, and timely information, and IT ...
خاک مراتع ذخیرهگاه مهم جهانی کربن بوده و هرگونه تغییر در این ذخیرهگاه تأثیر زیادی بر انتشار دیاکسیدکربن به اتمسفر و گرمایش جهانی دارد. ظرفیت این ذخیرهگاه به وسیله روابط متقابل پیچیده بین عوامل متنوعی مانند اقلیم، خصوصیات خاک، نوع پوششگیاهی و اقدامات مدیریتی کنترل میشود. مدلهای کربن برای فهمیدن اثر این فاکتورها بر کربن خاک در بلندمدت نقش مهمی دارند. مدلهای کربن باید به طور صحیح در منطق...
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