排序方式： 共有81条查询结果，搜索用时 46 毫秒
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理论分析了子午光线通过直锥形塑料光纤的光线传输原理,模拟计算了直锥形光纤的锥角α、光纤中心轴线夹角θ(m)与反射次数m三者的变化关系.通过重力垂直拉锥实验制作了大芯径直锥形塑料光纤,并得出相关的实验结论. 相似文献
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建立基于SAN技术的存储网络 总被引：7，自引：0，他引：7
刘书香 《北京工业职业技术学院学报》2005,4(1):49-52
各种网络应用服务的飞速发展,促进了以SAN(存储区域网)为代表的网络存储技术的发展.分析了SAN的部署架构及其技术特点,在此基础上讨论了在企业生产环境中如何将SAN存储技术与传统的NAS技术结合,构建可扩展的存储环境. 相似文献
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ZHOU Kun LIN Jian-zhong 《浙江大学学报(A卷英文版)》2007,8(7):1021-1025
A non-stretchable fiber rotation in planar flows has been solved. The fiber will rotate periodically or run to the asymptotical direction decided by a discriminant defined in the paper involving the fiber aspect ratio and the flow characteristics. Subsequently the fiber orientation distribution is derived directly without the bother of solving the Fokker-Planck equation. The research clearly indicates the overall configuration of a fiber rotation movement in planar flows. 相似文献
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针对烽火通信股份有限公司光通信行业进行专利竞争情报分析。文章首先对烽火通信的专利竞争环境进行
分析,包括全国和武汉市的光通信行业专利情况。在专利数据检索的基础上,通过对烽火通信光通信领域专利信息的
数据整理,对其年度专利申请量、专利类型、有效专利和专利发明人进行分析;然后对比分析其在武汉地区和全国范
围内的重要竞争对手的竞争环境和专利现状,得出烽火通信在光通信领域的技术领先地位等基本结论。 相似文献
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The configuration of the novel three-stage L-band erbium-doped fiber amplifier with very large and flat gain and very low noise figure presented in this paper uses the forward ASE (amplified spontaneous emission) from the first section of the EDF (erbium-doped fiber) and the backward ASE from the third section of the EDF (both serve as the secondary pump sources of energy) to pump the second EDF. To improve the pump efficiency, the power of the pump is split into two parts (with a ratio of e.g. 2:7). The characteristics of this L-band EDFA are studied on the basis of the Giles Model with ASE. 相似文献
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The structural features of fiber suspensions are dependent on the fiber alignment in the flows. In this work the orientation
distribution function and orientation tensors for semi-concentrated fiber suspensions in converging channel flow were calculated,
and the evolutions of the fiber alignment and the bulk effective viscosity were analyzed. The results showed that the bulk
stress and the effective viscosity were functions of the rate-of-strain tensor and the fiber orientation state; and that the
fiber suspensions evolved to steady alignment and tended to concentrate to some preferred directions close to but not same
as the directions of local streamlines. The bulk effective viscosity depended on the product of Reynolds number and time.
The decrease of effective viscosity near the boundary benefited the increase of the rate of flow. Finally when the fiber alignment
went into steady state, the structural features of fiber suspensions were not dependent on the Reynolds number but on the
converging channel angle.
Projects (No. 19925210) supported by the National Natural Science Foundation of China 相似文献