排序方式: 共有31条查询结果,搜索用时 15 毫秒
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小区信息综合查询系统是大连分公司自主研发的信息查询工具,该系统以网页的形式进行访问,可通过小区名、小区号、网元号、CGI等信息进行查询,查询结果包含了频率信息、硬件信息、性能信息、告警信息、干扰信息和直放站信息等常用数据。 相似文献
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通过利用标准简正波程序KRAKEN计算本地简正波解及耦合矩阵, 进一步发展了求解水平变化波导中声场的全局矩阵耦合简正波方法(Luo et al., "A numerically stable coupled-mode formulation for acoustic propagation in range-dependent waveguides," Sci. China-Phys. Mech. Astron. 55, 572 (2012)), 使得该方法可以处理具有可穿透海底及随深度变化声速剖面等实际问题, 并提供声场的完全双向解. 本文还给出了双层波导中耦合矩阵的解析表达式, 并利用其验证了本方法中耦合矩阵数值算法的精度. 最后, 利用改善后的全局矩阵耦合简正波模型(DGMCM)计算了美国声学学会(ASA)提出的可穿透楔形波导标准问题, 将所得数值解与参考解比较, 结果表明DGMCM方法可以精确处理水平变化波导中声传播实际问题.
关键词:
耦合简正波理论
全局矩阵方法
可穿透楔形波导 相似文献
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Sound propagation in a wedge-shaped waveguide with perfectly reflecting boundaries is one of the few range-dependent problems with an analytical solution, and hence provides an ideal benchmark for a full two-way solution to the wave equation. An analytical solution for the sound propagation in an ideal wedge with a pressure-release bottom was presented by Buckingham and Tolstoy [Buckingham and Tolstoy 1990 J. Acoust. Soc. Am. 87 1511]. The ideal wedge problem with a rigid bottom is also of great importance in underwater acoustics. We present an analytical solution to the ideal wedge problem with a perfectly reflecting bottom, either rigid or pressure-release, which may be used to provide a means for investigating the sound field in depth-varying channels, and to establish the accuracy of numerical propagation models. Closed-form expressions for coupling matrices are also provided for the ideal waveguides characterized by a homogeneous water column bounded by perfectly reflecting boundaries. A comparison between the analytical solution and the numerical solution recently proposed by Luo et al. [Luo W Y, Yang C M and Zhang R H 2012 Chin. Phys. Lett. 29 014302] is also presented, through which the accuracy of this numerical model is illustrated. 相似文献
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牛磺酸与对苯醌的荷移反应 总被引:1,自引:0,他引:1
用分光光度法研究牛磺酸与对苯醌的荷移反应.实验表明,牛磺酸与对苯醌在pH 8.5的三酸缓冲溶液中,90℃水浴加热20min,可生成稳定的荷移络合物.荷移络合物的组成比为2∶1,最大吸收波长λmax=339nm,表观摩尔吸光系数ε=5.9×104L/mol·cm,在4-180μg/mL的范围内符合比耳定律,回收率在96.... 相似文献
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主要介绍了高速串行总线在传输介质高频衰减较大的情况下采用的这两种补偿技术,并介绍了这两种补偿技术的原理与优缺点。结合其优缺点,给出了如何正确使用这两种补偿技术的方法。 相似文献
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