期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
温度-压强耦合并行激发主动拆卸结构的设计方法研究
1
作者 刘志峰 詹一飞 +1 位作者 李新宇 成焕波 《中国机械工程》 EI CAS CSCD 北大核心 2014年第18期2484-2489,共6页
目前的主动拆卸结构的拆解一般应用单一物理场激发,在极端环境或意外环境中可能会发生主动拆解,产品可靠性不高,针对此,研究了温度-压强耦合并行激发主动拆卸结构的激发原理和特点,提出了温度-压强耦合并行激发主动拆卸结构的设计方法,... 目前的主动拆卸结构的拆解一般应用单一物理场激发,在极端环境或意外环境中可能会发生主动拆解,产品可靠性不高,针对此,研究了温度-压强耦合并行激发主动拆卸结构的激发原理和特点,提出了温度-压强耦合并行激发主动拆卸结构的设计方法,并通过案例分析,验证了该设计方法的可行性。研究结果表明:应用温度-压强耦合并行激发的主动拆卸结构作为连接单元的产品,其可靠性大幅度提高。 展开更多
关键词 主动拆卸 多场耦合 并行激发 设计方法
下载PDF
High Speed VCSEL-Based Parallel Optical Transmission Modules
2
作者 陈弘达 申荣铉 +4 位作者 裴为华 贾九春 唐君 周毅 许兴胜 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第8期1500-1503,共4页
Design and fabrication of a parallel optical transmitter are reported. The optimized 12 channel parallel optical transmitter,with each channel's data rate up to 3Gbit/s,is designed, assembled, and measured. A top-emi... Design and fabrication of a parallel optical transmitter are reported. The optimized 12 channel parallel optical transmitter,with each channel's data rate up to 3Gbit/s,is designed, assembled, and measured. A top-emitting 850nm vertical cavity surface emitting laser(VCSEL) array is adopted as the light source,and the VCSEL chip is directly wire bonded to a 12 channel driver IC. The outputs of the VCSEL array are directly butt coupled into a 12 channel fiber array. Small form factor pluggable (SFP) packaging technology is used in the module to support hot pluggable in application. The performance results of the module are demonstrated. At an operating current of 8mA, an eye diagram at 3Gbit/s is achieved with an optical output of more than 1mW. 展开更多
关键词 VCSEL parallel optical transmission 12 channel fiber array MODULES
下载PDF
基于光楔的并行受激发射损耗荧光擦除图案产生方法
3
作者 张硕晨 冯继宏 《中国激光》 EI CAS CSCD 北大核心 2020年第2期347-353,共7页
提出了一种基于光楔的全新的并行荧光擦除图案产生方法,使用光楔及配套反光镜来调控损耗光束入射辅助物镜时的物方倾斜角,可充分利用显微物镜的数值孔径,产生出周期更小的并行荧光擦除图案。仿真结果显示:当使用数值孔径为1.4的显微物... 提出了一种基于光楔的全新的并行荧光擦除图案产生方法,使用光楔及配套反光镜来调控损耗光束入射辅助物镜时的物方倾斜角,可充分利用显微物镜的数值孔径,产生出周期更小的并行荧光擦除图案。仿真结果显示:当使用数值孔径为1.4的显微物镜且损耗光波长为760 nm时,所提方法能产生出周期为282.0 nm×283.6 nm的正方形网格状并行荧光擦除图案,能实现更高的成像分辨率。 展开更多
关键词 医用光学 荧光显微镜 并行激发射损耗 荧光擦除图案 光楔 几何光学 数值仿真
原文传递
并行STED显微中光学系统对荧光擦除图案的影响
4
作者 张硕晨 冯继宏 《激光与光电子学进展》 CSCD 北大核心 2020年第9期156-161,共6页
并行受激发射损耗(STED)显微术采用周期性排列的光学格子作为荧光抑制图案并行实现多点荧光擦除,可以有效地提升显微成像的时间分辨率。本文建立了并行STED显微成像系统的简化光学系统模型,在此基础上推导出受光学参数影响的并行荧光擦... 并行受激发射损耗(STED)显微术采用周期性排列的光学格子作为荧光抑制图案并行实现多点荧光擦除,可以有效地提升显微成像的时间分辨率。本文建立了并行STED显微成像系统的简化光学系统模型,在此基础上推导出受光学参数影响的并行荧光擦除图案周期公式,来阐明辅助物镜及显微物镜对该周期的影响机理。由该公式,解出了能产生更小周期并行荧光擦除图案的最优光学参数。数值仿真结果显示,本文方法能产生出周期小至276nm×276nm的正方形网格状并行荧光擦除图案。 展开更多
关键词 显微 荧光显微镜 并行激发射损耗 荧光擦除图案 光学系统参数 数值仿真
原文传递
Comparative analysis of the characteristics of global seismic wave propagation excited by the M_w 9.0 Tohoku earthquake using numerical simulation 被引量:4
5
作者 YAN ZhenZhen ZHANG Huai +1 位作者 FAN XiangTao DU XiaoPing 《Science China Earth Sciences》 SCIE EI CAS 2014年第7期1626-1636,共11页
Giant earthquakes generate rich signals that can be used to explore the characteristics of the hierarchical structure of the Earth’s interior associated with the eigenfrequencies of the Earth.We employ the spectral e... Giant earthquakes generate rich signals that can be used to explore the characteristics of the hierarchical structure of the Earth’s interior associated with the eigenfrequencies of the Earth.We employ the spectral element method,incorporated with large-scale parallel computing technology,to investigate the characteristics of global seismic wave propagation excited by the2011 Mw9.0 Tohoku earthquake.The transversely isotropic PREM model is employed as a prototype of our numerical global Earth model.Topographic data and the effect of the oceans are taken into consideration.Wave propagation processes are simulated by solving three-dimensional elastic wave governing equations with the seismic moment tensor obtained from the Global Centroid Moment Tensor Catalog.Three-dimensional visualization of our computing results displays the nature of the global seismic wave propagation.Comparative analysis of our calculations with observations obtained from the Incorporated Research Institutions for Seismology demonstrates the reliability and feasibility of our numerical results.We compare synthetic seismograms with incorporated and unincorporated ocean models.First results show that the oceans have obvious effects on the characteristics of seismic wave propagation.The peak displacement and peak velocity of P waves become relatively small under the effect of the ocean.However,the effect of the ocean on S-waves is complex.The displacement and velocity of S waves decrease rapidly over time using an unincorporated ocean model.Therefore,the effects of the ocean should be incorporated when undertaking quantitative earthquake hazard assessments on coastal areas.In addition,we undertake comparative analysis on the characteristics of the Earth’s oscillation excited by the 2004 Sumatra-Andaman,2008 Wenchuan,and 2011Tohoku earthquakes that incorporate the effect of the Earth’s gravitational potential.A comparison of the amplitude spectra of the numerical records indicates that energy released by the three big earthquakes is different.Our comparative analysis realizes that the computing results can accurately reproduce some eigenfrequencies of the Earth,such as toroidal modes 0T2 to 0T13and spheroidal modes 0S7 to 0S31.These results demonstrate that numerical simulations can be successfully used to investigate the Earth’s oscillations.We propose that numerical simulations can be used as one of the major tools to further reveal how the Earth’s lateral heterogeneities affect the Earth’s oscillations. 展开更多
关键词 Mw9.0 Tohoku earthquake Sea of Japan numerical simulation global seismic wave propagation Earth's oscillations
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部