منابع مشابه
The Alexander von Humboldt-Foundation
The Alexander von Humboldt Foundation promotes academic cooperation between excellent scientists and scholars from abroad and from Germany. To this end, it grants more than 700 research fellowships and research awards annually. These allow scientists and scholars from all over the world to come to Germany to work on a research project they have chosen themselves together with a host and collabo...
متن کاملA. Von Humboldt Fellow.
We derive the kinematical constraints which characterize the decay of any massless particle in flat spacetime. We show that in perturbation theory the decay probabilities of photons and Yang-Mills bosons vanish to all orders; the decay probability of the graviton vanishes to one-loop order for graviton loops and to all orders for matter loops. A general power counting argument indicates in whic...
متن کاملAlexander von Humboldt Professorship Research Project : Foundations and Architectures for the Next Generation of Wireless Networks
Millimeter-wave (mm-Wave) cellular systems are a promising option for a very high data rate communication because of the large bandwidth available at mm-Wave frequencies. To compensate the large path-loss exponent in the mmWave range of the spectrum, directional beamforming with a large antenna gain at both the user side and base-station side is necessary; this boost the signal-to-noise ratio t...
متن کامل[Considerations on the concepts of nature, space, and morphology in Alexander von Humboldt and on the genesis of modern physical geography].
The article discusses how Alexander von Humboldt developed the concepts of nature, space, and morphology in his works and impacted the shaping of modern physical geography. Influenced by Kant's ideas in Critique of judgment and also by the writings of Goethe and Schelling, Humboldt devised a new interpretation and representation of nature on Earth's surface, wherein the concept of space is esse...
متن کاملTexts and the Construction of Popular Perceptions: The Writings of Alexander von Humboldt and Justo Sierra and the Rise and Fall of Mexicoâ•Žs Legendary Wealth
Popular perceptions of Mexico’s natural wealth changed dramatically over the course of the national period (1820s to the present). During Mexico’s first half-century of independent existence (1820s-1870s), nationals and foreigners sang praise to Mexico’s immense natural riches, maintaining Mexico was a cornucopia, which the geographical shape of the country vividly demonstrated. From the late 1...
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ژورنال
عنوان ژورنال: Hispanic American Historical Review
سال: 1964
ISSN: 0018-2168,1527-1900
DOI: 10.1215/00182168-44.3.394