The Research and Application of ATM Testing

The Research and Application of ATM Testing     

Study on Theory and Methods of Telecommunication Tariff

Study on Theory and Methods of Telecommunication Tariff     

Research of Homodyne Optical Fiber Communication System and Asociated Technologies

ｅｃａｕｓｅｉｔｈａｓｔｈｅａｄｖａｎｔａｇｅｓｏｆｈｉｇｈｓｅｎｓｉｔｉｖｉｔｙ，ａｎｄｉｔｉｓｅａｓｙｔｏｄｅｍｏｄｕｌａｔｅａｎｄｃｏｎｖｅｎｉｅｎｔｔｏｓｅｌｅｃｔｉｎＦＤＭｓｙｓｔｅｍ，ｔｈｅｃｏｈｅｒｅｎｔｏｐｔｉｃａｌｆｉｂｅｒｃｏｍｍ...     

Theories on Solving the Travelling Salesman Problem Based on Artificial Neural Network and Their Applications

ＮＰｈａｒｄｐｒｏｂｌｅｍｓｈａｖｅａｐｐｅａｒｅｄｉｎｍａｎｙａｒｅａｓ．Ｉｎｔｈｉｓａｒｔｉｃｌｅ，ｉｔｉｓｄｉｓｃｕｓｅｄｈｏｗｔｏｓｏｌｖｅｔｈｉｓｋｉｎｄｏｆｐｒｏｂｌｅｍｓｕｓｉｎｇａｒｔｉｆｉｃｉａｌｎｅｕｒａｌｎｅｔｗｏｒｋ—Ｈｏｐ...     

沥青混凝土的三轴试验及其应力应变特性

以沥青混凝土为心墙的砂卵石坝,近来在国内外发展颇快,特别是在七十年代,一个比一个高的这类心墙坝不断出现。诸如英国的麦杰脱坝,高56米,西德的小金齐坝,高77米,香港高岛二座分别高达90米和107米的蓄水坝,都是在七十年代的中后期建筑的,奥地利的芬斯特坝,坝高149米,亦在施工中。位     

Alpha(1) adrenoceptor subtype selectivity. 3D-QSAR models for a new class of alpha(1) adrenoceptor antagonists derived from the novel antipsychotic sertindole

Receptor-binding affinities for the alpha(1) adrenoceptor subtypes alpha(1a), alpha(1b) and alpha(1d) for a series of 39 alpha(1) adrenoceptor antagonists derived from the antipsychotic sertindole are reported. The SAR of the compounds with respect to affinity for the alpha(1a), alpha(1b) and alpha(1d) adrenoceptor subtypes as well as affinity obtained by an alpha(1) assay (rat brain membranes) were investigated using a 3D-QSAR approach based on the GRID/GOLPE methodology. Good statistics (r(2)=0.91-0.96; q(2)=0.65-0.73) were obtained with the combination of the water (OH2) and methyl (C3) probes. The combination of steric repulsion and electrostatic attractions explain the affinities of the included molecules. The adrenergic alpha(1a) receptor seems to be more tolerant to large substituents in the area between the indole 5- and 6-positions compared to the adrenergic alpha(1b) and alpha(1d) receptor subtypes. There seems to be minor differences in the position of areas in the alpha(1b) receptor compared to alpha(1a) and alpha(1d) receptors where electrostatic interaction between the molecules and the receptor (OH2 probe) contribute to increased affinity. These observations may be used in the design of new subtype selective compounds. In addition, the model based on biological data from an alpha(1) assay (rat brain membranes) resembles the model for the alpha(1b) adrenoceptor subtype.     

对蔗渣刨花板生产线的几项技术改造

对蔗渣刨花板生产线的几项技术改造广西大桥糖厂碎料板分厂张旭窗我厂刨花板生产线是选用××机械厂生产的设备，以甘蔗渣为原料，设计能力为年产一方立方米，１９９１年６月建成投产。经三个月的试产，发现此生产线存在一些问题；一是生产能力只达到设计能力的；二是设备...     

Preparation of MWNTs/Al<Subscript>2</Subscript>O<Subscript>3</Subscript> composites and their mechanical and electrical properties

Since their discovery by Iijima[1], carbon nanotubes (CNTs) have been the focus in novel materials research. Theoretical and experimental studies show[2-9] that CNTs have extraordinary mechanical and electrical properties. Krishnan et al.[2] have reported that the mean value of Young’s modulus of single-wall nanotubes (SWNTs) is 1.25 TPa. Yu et al.[3] measured Yang’s modulus of multi-wall nanotubes (MWNTs) between 270 and 950 GPa and breaking strength between 11 and 63 GPa. The ele…     

The Advantage of Sensor Sealing Laser Welding

Laser Welding Inevitably Applied in Sensor Production Certain kinds of sensors such as pressure sensor, temperature sensor, optic-electronic sensor etc. utilize welding seal according to different application environment. With precision components and IC which is isolated by inert gas inside, these sensors should be sealed and able to resist the pressure. So the welding process must avoid distortion and harm to the components and IC.