منابع مشابه
Recovering the Vestiges of Primeval Europe: Archaeology and the Significance of Stone Implements, 1750–1800
For the antiquaries of the seventeenth and eighteenth centuries who studied the few broken monuments and obscure artifacts that survived from the earliest periods of human history there was a dawning realization that these remote epochs were not as inaccessible as had previously been believed. This attitude was mirrored in geological research where natural historians were using fossils and geol...
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Little is known about the gap pattern of primeval beech forests, since large-scale studies with continuous coverage are lacking. Analyses of forest structural patterns have benefitted from advances in remote sensing, especially with the launch of satellites providing data of submetric ground resolution. These developments can strongly advance our knowledge of natural forest dynamics and disturb...
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Having initially welcomed more than a million refugees and forced migrants into Europe between 2015 and 2016, the European Union’s (EU’s) policy has shifted toward externalising migration control to Turkey and Northern Africa. This goes against the spirit of international conventions aiming to protect vulnerable populations, yet there is widespread indifference toward t...
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A detailed examination of the Killing equations in Robertson– Walker coordinates shows how the addition of matter and/or radiation to a de Sitter Universe breaks the symmetry generated by four of its Killing fields. The product U = a2 Ḣ of the squared scale parameter by the time-derivative of the Hubble function encapsulates the relationship between the two cases: the symmetry is maximal when U...
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ژورنال
عنوان ژورنال: Nature
سال: 1880
ISSN: 0028-0836,1476-4687
DOI: 10.1038/022400a0