نتایج جستجو برای: 20th
تعداد نتایج: 17554 فیلتر نتایج به سال:
At the beginning of the 20th century descendants of the early European settlers who first colonized the coasts of Virginia, the Carolinas, and Georgia were established throughout the region. Most all of the native people had been displaced. Cotton was king. The mature forests were being . the southern world, wavered and then toppled. Demand for the South’s cotton declined due to new competition...
[1] A new monthly volcanic forcing dataset is included in a coupled GCM for a more physically consistent treatment of the stratospheric sulfate aerosol history from explosive volcanism. The volcanic forcing is different from previous versions in that there is an individual evolution of the aerosol for each event. Thus the seasonal and latitudinal dependence of the volcanic aerosol can affect gl...
FORM. In the most general sense: shape (contour, the variation of some attribute of a thing in space or time), and structure (the disposition of parts, relations of part to part, and of part to whole). In music, shape is the result of changes in some attribute or parameter of sound, in time, while structure has to do with various relations between sounds and sound-configurations, at the same or...
In 1997, 6 years after the World Wide Web became accessible to the public, the Proceedings of the National Academy of Sciences launched its website, heralding our entry into the Internet age and the expeditious dissemination of our scientific content worldwide (see Infographic). Toward the end of the last millennium, we redesigned the website to improve user experience and rebranded the journal...
If you talk about the end of one century and the beginning of the next you have two choices, both of them difficult. One is to survey the mathematics over the past hundred years; the other is to predict the mathematics of the next hundred years. I have chosen the more difficult task. Everybody can predict and we will not be around to find out whether we were wrong. But giving an impression of t...
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