منابع مشابه
Comparison of Species Diversity of Natural and Man-made Gaps at Different Physiographic Conditions in Siahkal Forests of Gilan Province
<p</pThis study was conducted to compare regeneration density and biodiversity indices in the natural and man-made gaps in the Tutaki forests of Siahkal in Gilan province. Data were collected from 60 gaps (including 30 natural and 30 man-made gaps). The results of species composition indicated that three tree species including Diospyros lotus L., Carpinus betulus L. and Alnus glutinosa L. in bo...
متن کاملConservation Ecology: Mammalian herbivores in the boreal forests: their numerical fluctuations and use by man
Within the boreal zone, there are about 50 native mammalian herbivore species that belong to the orders Artiodactyla, Rodentia, and Lagomorpha. Of these species, 31 occur in the Nearctic and 24 in the Palaearctic. Only six species occur in both regions. Species of the family Cervidae have probably been, and still are, the most important group for man, as they provide both meat and hides. Pelts ...
متن کاملA new philosophy of man and humanism
The theoretical basis for the new philosophy was laid by the American philosopher James Joseph Dagenais (1923-1981), who came to the conclusion that philosophical anthropology is not a science, but a domain unto itself, and that a philosophy of man can only come about as a joint undertaking of all sciences, in which the object of study must be man himself. The final explanation of man lies outs...
متن کاملResearch on Hybrid Ray-tracing at 2.4 GHz in Man- Made Forests
The shadow of diffraction, which account for the growth of trees based on wireless sensors and automatic acquisition of environmental information, were presented to meet the requirements for a wireless sensor network in a forest. there’s a necessity to avoid the dead zone of signal diffraction when laying wireless sensor in the forest, the integration of SBR and UTD is applied to study the impa...
متن کاملThe Establishment of Field Intensity Model of Wireless Telemetry Signal in Man-made Forests
On the basis of the configuration characteristics of man-made forests, the spread model of wireless sensor signal in man-made forests has been simplified according to electromagnetic wave theory and Fermat principle. The man-made forests is decomposed into independent medium with four layers, the spread model is simplified into free space model, attenuation screen model and absorption screen mo...
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ژورنال
عنوان ژورنال: Nature
سال: 1949
ISSN: 0028-0836,1476-4687
DOI: 10.1038/164687a0