نتایج جستجو برای: in 1931 since then
تعداد نتایج: 17020479 فیلتر نتایج به سال:
any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...
Classification of C. diphtherice into gravis, mitis and intermedins groups according to their cultural and other biological character is well known (Anderson et al. 1931). A perusal of literature shows that serological classification of C. diphtheria?, though known since 1896 has been placed on a sound footing only recently by Hewitt (1947a) in England and Ferris (1950) in Australia after a tho...
One of the basic principles of dimensional metrology is that a part dimension changes with temperature because of thermal expansion. Since 1931 industrial lengths have been defined as the size at 20 °C. This paper discusses the variety of standard temperatures that were in use before that date, the efforts of C.E. Johansson to meet these variations, and the effort by the National Bureau of Stan...
THE BALANCED CURRENT AMPLIFIER A NEW PARADIGM FOR THE 21ST CENTURY In 1931 Loy Barton, a research worker employed by David Sarnoff , unearthed the paradigm that has dominated all electronic power amplifiers used for audio reproduction and industrial power to this present day. Many incremental additions have embellished Loy’s original invention since its inception. The embellishments have many n...
This paper estimates the standard and tax-adjusted market risk premiums in New Zealand using historical data between 1931-2002 and a variant of the Siegel (1992) methodology. Similar to Siegel we present evidence that real bond yields in New Zealand were low over the period 1931-2002 and this may bias upwards an Ibbotsontype estimate of the market risk premium. Using an estimate for the histori...
It is one of the salient features of an intuitionistic philosophy of mathematics that it denies the possibility that there may be infinite coincidences in mathematics: if a sentence is true, it can only be because there is a finitely expressible reason for it. The same view was expressed from a different standpoint by Hilbert in 1924 when he asserted that in mathematics there is ignorabimus. It...
introduction: for some time now the field of medical education has been criticized by many of its stakeholders. countless debates have been presented in the literature regarding the quality of medical education research, adequacy of methodological rigor, and other concerns. methods: at present, the views expressed have largely come from physicians and individuals with less familiarity with educ...
A British soldier, aged 24, was admitted to hospital on 31st March, 1935, complaining of ' fits Past history.?The patient has 8i years' service in India.In 1931 he was admitted to hospital for pneumonia and was treated for tapeworm during convalescence. He states that at Bareillv he had his first ' fit' while playing football. This was attributed to cardiac irritability of adolescence." Ever si...
charles dickens was a voracious reader even in his childhood. his early reading of seventeenth- and eighteenth-century picaresque fiction greatly influenced his writing style. his first novel, the pickwick papers, is a tale of rogues and swindlers, adventures and quests, satire and comedy, and innocence and experience. oliver twist, dickens’ second novel, is a young boy’s progress through a cor...
Since the earliest attempt by Klinger in 1931 to describe the systemic vasculitis subsequently characterized in 1936 by Wegener as Wegener's granulomatosis, this disorder has been reported to present in a number of differing fashions. No previous description relates Wegener's presenting as a seizure disorder, and no reports of MRI of the brain in such patients exists. We relate such a case, alo...
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