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The runoff of the Huanghe contains a great amount of suspended load and forms the high-density underflows (hyperpycnal currents) at the river mouth. The sediments over the subaqneous delta are mainly transported by the underflow. The sediment texture gradually get fining seawards, which relates to the attenuation of the hyperpycnal currents and hypopycnal plumes. Being hydraulically equivalent to the medlum-silt-sized quartz, which is the dominant component in the sediments, the clastic mica concentrates on the delta. The maximum thickness of the subaqueous delta is about 16m and the period of accumulation lasted from 12 to 16 years, therefore its sedimentary rate ranges from 110 to 130 cm/a. 相似文献
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In this paper, slow and fast light of a signal pulse of nanosecond duration are achieved in the same experimental device by using band-pass filters to tailor the spectra of spontaneous Brillouin scattering (SPBS) coming from 50 km single-mode optical fibers (SMF) as the pump light. The phase matching condition of slow and fast light is satisfied by changing wavelengths of band-pass filters .In our experiment, we obtain the tunable delay time for various signal pulses range from 1 ns to 20 ns. By increasing the power of the pump field to 16 mW, a 1 ns signal pulse is delayed 1.5 ns and is advanced 1.0 ns respectively, while the signal pulse almost has no distortion. The experiment has demonstrated that larger relative pulse delay of slow and fast light can be obtained in the same experimental setup when pump power is lower. 相似文献
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由完全正常化缔合勒让德函数构成的球谐级数式,在接近两极时,超高阶次(如超过2500阶次)缔合勒让德函数值的递推计算,达到极大的数量级(超过10的数千次方),产生下溢,这导致一般递推方法失效.本文就缔合勒让德函数的4种常用递推算法,分别进行改进以增加数值稳定性并延缓下溢.最后对由改进算法获得的勒让德函数,结合Horner求和技术,给出计算超高阶球谐级数部分和式的方法. 相似文献
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考虑质量失误与延期交货问题的供应链博弈分析 总被引:12,自引:0,他引:12
质量成本和延期交货成本是供应链企业签订契约时需要重点考虑的问题。本考虑在存在质量失误与延期交货问题的情形下,两层次供应链中供应商和制造商的博奔关系模型,证明了最优解以及相应罚金的存在性,井分析了质量水平、延期交货与罚金之间的关系。 相似文献
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针对鱼雷声自导测试信号源中的目标辐射信号模拟问题,集中探讨窄带噪声的生成及其通道间时延控制算法。首先研究窄带噪声实时生成算法,基于线性同余法生成均匀噪声,以其作为查询噪声池的地址,产生宽带噪声,并通过带通滤波得到窄带噪声。为保证模拟目标的方位角精度,精确控制各个通道的时延量,提出适用于宽带信号的延时滤波算法,基于多采样率信号处理技术,通过对噪声信号进行插值、延迟、选抽、滤波等操作,提高时延控制精度。结合算法原理分析,得到延时滤波的简化算法。数字仿真表明,提出算法适用于窄带信号实时生成,时延控制精度高。 相似文献
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WANG Guoping 《Chinese Journal of Lasers》1996,5(5):475-480
InfluenceofPost-bakingandDelayingProcessesonDichromatedHolograms:TheirMechanismWANGGuoping(DepartmentofPhysics,WuhanUniversit... 相似文献
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** Email: pturner{at}clarkson.edu Symmetric level-index arithmetic was introduced to overcomethe problems of overflow and underflow in the floating-pointsystem. The purpose of this paper is to improve the algorithmperformance of SLI arithmetic by introducing an approximationscheme using Taylor's expansion. Following a brief summary ofthe SLI system and its algorithm for addition/subtraction, thededuction and analysis of Taylor approximation are presented.Also some results from numerical experiments and timing comparisonson possible implementations show the advantage of the approximationmethod. 相似文献
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