منابع مشابه
Spectral analysis of flowers used by nectar-feeding birds in an urban area in Southeastern Brazil.
The objective of this study was to determine the spectral characteristic of nectar-producing flowers visited by nectarivorous birds in urban areas. This study was carried out in the central area of the city of Taubaté, in the northeast of the State of São Paulo. The sample areas included green areas, such as squares and parks, and the vegetation of streets and avenues. Twelve plant species were...
متن کاملcontrol of the optical properties of nanoparticles by laser fields
در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولHabitat suitability modeling of water birds and waders in Hamun wetland by by Maximum Entropy model
Climate change and human activities have increased negative pressure on natural ecosystems. Wetlands are such ecosystems that widely affected by these negative changes. Birds as a part of wildlife in a wetland have damaged by destruction of wetlands, so, a large group of them, are at risk of extinction. Habitat destruction in wetlands in arid and semi-arid areas has more negative effects on the...
متن کاملTowards the Narrative Intertextuality in Poetic Narratology: An Intertextual Analysis of Lawrencian Birds, Beasts and Flowers
For a long time, there have been the mountainous discussions about intertexuality in the field of novelist narrative studies by scholars from China and western countries in their academic practices in terms of the in-textual responses from a novelist narrative text to another produced either by the same writer or by different novelists based on the academic focus of the textual influences from ...
متن کاملAnt mimicry by Passiflora flowers?
Mutualism between plants and the ants that defend them from herbivory is a well-known phenomenon. Because of ant aggression, ant mimicry as a defense against predation is very common in the animal kingdom, and has already been suggested as a type of visual anti-herbivory defensive coloration in leaves and stems of several plant species. Many Passiflora species have dark dots and short stripes o...
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ژورنال
عنوان ژورنال: Nature
سال: 1877
ISSN: 0028-0836,1476-4687
DOI: 10.1038/016476b0