Автор: Jun Ye, Steven T.Cundiff
Издательство: Springer
Год издания: 2005
isbn: 0387237909
Количество страниц: 374
Язык: english
Формат: PDF
Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in 10**14.Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology.” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics.
Автор: John McDonald
Издательство: Getty Publications
Год издания: 1996
isbn: 0892364157
Количество страниц: 120
Язык: english
Формат: PDF
If you can't get to Egypt anytime soon, take John McDonald's informative tour of beloved Queen Nefertari's tomb, which has only been open to the public since 1995. The beautifully structured House of Eternity is replete with full-color photographs of the contrasting desert landscape, the elaborate tomb, and the paintings. Included are explanations of the hieroglyphs and artwork, plus interesting snippets from Nefertari's culture. For example, the queen's own status wasn't enough to make her powerful in the afterlife. The magical chapter 17 from the Egyptian Book of the Dead contains a spell that is painted on Nefertari's tomb walls to assure her transformation from playing senet, to becoming a "ba" bird, then finally worshipping a lion-headed god. To ensure success, the spell ends right at the doorway that marks the burial chamber. Most souls were believed to experience the judgment of Osiris--not so with Nefertari, whose tomb contains no mention of this trial. In fact, most of the gods seem to be greeting Nefertari and urging her through the many passages to Necropolis, the city of the dead. Although the annexes are not open to the public, McDonald has included a photograph and discussion of the only evidence of Nefertari in mummified form.
Автор: Mary Meghan Ryan
Издательство: Bernan Press
isbn: 1598883046
Количество страниц: 579
Язык: english
Формат: PDF
In earlier editions, this publication analyzed some of the issues that were then being addressed: the decline in employment in the manufacturing sector, the high unemployment rates for young minorities, the cost of health care services and prescription drugs, the changing pension plans, the specter of inflation as a result of the rise in fuel prices, the impact of changing technology on the educational and occupational requirements of industry, and the impact of immigration on the structure of the labor force. The dramatic aging of the labor force is a major factor in current discussions about the cost of health care and changing pension plans. Policy decisions on these questions are still relevant today. Other issues include the stagnation of real wages despite an increase in productivity, which has led to concern that this trend indicates a lack of progress in improving the standard of living of workers.
Издательство: ООО «Юлис»
Год издания: 2010
Количество страниц: 32
Язык: русский
Формат: DJVU
Непоседа – журнал для детей дошкольного и младшего школьного возраста. В этом номере вас ждёт увлекательное путешествие, познавательные истории, сказки, кроссворды, лабиринты, раскраски, вырезалки и многое другое…
Автор: Jack Spielvogel
Издательство: Charles Scribner's Sons
Год издания: 2006
isbn: 0618532943
Количество страниц: 668
Язык: english
Формат: PDF
Medieval and Early Modern Times (Discovering Our Past) is a California middle school world history program organized chronologically, and co-authored by National Geographic and Jackson Spielvogel. The textbook's engaging narrative and outstanding visuals transport students back in time. As co-author, National Geographic ensures that students understand the influence of geography on historical events. The result is a standards-based program with important geography skills embedded in every lesson.
Автор: Соболева Н. А.
Издательство: Наука
Год издания: 1991
isbn: 5-02-008568-5
Количество страниц: 240
Язык: русский
Формат: PDF
Данная книга посвящена изучению русских средневековых печатей. В монографии исследуются памятники русской сфрагистики, преимущественно Северо-Восточной Руси XIV-XV вв. Составлен каталог печатей-оттисков XIV-XV вв., фотографически воспроизведены более 100 печатей.
Автор: Савицкий Г.А.
Издательство: Стройиздат
Год издания: 1972
Количество страниц: 110
Язык: русский
Формат: DJVU
В книге изложены основные вопросы расчета сооружений различного назначения на ветровую нагрузку. Даются общие сведения о структуре ветра и регламентированные данные о ветровой нагрузке, которые не ограничиваются только материалами, изложенными в Строительных нормах и правилах. На основе кратких сведений из гидродинамики рассматриваются сопротивления потоку простых по форме тел, трубчатых, решетчатых и специальных конструкций, мачт и башен. Раздел аэродинамической устойчивости привлекает внимание к вибрации конструкций при ветре. Книга рассчитана на инженеров-проектировщиков, которым приходится учитывать в расчетах ветровую нагрузку на сооружения и специальные конструкции.
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