منابع مشابه
Narrow-beam tube
1. PURPOSE AND DESCRIPTION The narrow beam tube 06950.00 is used in conjunction with the pair of Helmholtz coils 06960.00 to study the behaviour of an electron beam in a magnetic field normal to the electron trajectory, which is made visible by the fluorescence of the insert gas with which the tube is filled. The tube has an axial scale shaped like a ladder, whose metal 'rungs' are given a coat...
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The application of directional antennas in wireless ad hoc networks brings numerous benefits, such as increased spatial reuse and mitigated interference. Most MAC protocols with directional antennas are based on the RTS/CTS mechanism which works well in wireless ad hoc networks using omni-directional antennas. However, RTS/CTS frames cannot mitigate the interference completely. Besides, they al...
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Two 60 Narrow-Beam Trisector Cell (NBTC) frequency reuse plans, 1x(3+1) and 2x(3+1), that employ Channel Alternation and Rotation (CAR) scheme are presented. In CAR, each cell type is allocated one extra channel set that allows network designer to rotate and alternate channels according to nearest front lobe interference avoidant strategy to enhance co-channel interference ratio (C/I) and allow...
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Fast realistic rendering of objects in scattering media is still a challenging topic in computer graphics. In presence of participating media, a light beam is repeatedly scattered by media particles, changing direction and getting spread out. Explicitly evaluating this beam distribution would enable efficient simulation of multiple scattering events without involving costly stochastic methods. ...
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Stereotactic radiosurgery (SRS) using external beams of radiation has become an important method of treatment of small intracranial lesions such as arteriovenous malformations, benign or malignant primary tumours and isolated metastases. In this technique, a high dose of radiation is delivered to the stereotactically localized lesion, the adjacent normal brain tissue being minimaly irradiated.
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ژورنال
عنوان ژورنال: Nature
سال: 1996
ISSN: 0028-0836,1476-4687
DOI: 10.1038/384513a0