检索结果-南通市图书馆

Chinese Physics Letters 2011年第6期28卷 137-140页

作者： WANG Jing ZHANG Xiao-Min HAN Wei li fu-quan ZHOU li-Dan FENG Bin XIANG Yong Research Center of Laser fusion China Academy of Engineering PhysicsMianyang 621900

We report the experimental investigation of a stimulated rotational Raman scattering effect in long air paths on SG-III TIL,with a 1053 nm,20-cm-diameter,linearly polarized,3 ns flat-topped laser *** intense speckle pattern of near field with thickly dotted hot spots is observed at the end of propagation with an intensity-length product above 17 TW/*** Stokes developing from the scattering of the laser beam by quantum fluctuations is characterized by a combination of high spatial frequency *** observed speckle pattern with small-diameter hot spots results from the combination of the nonlinear Raman amplification and the linear diffraction propagation effect of the Stokes with a noise pattern arising from the spontaneous Raman scattering.A new promising suppression concept based on the special characteristic of the Stokes,called active and selective filtering of Stokes,is proposed.

关键词： speckle filtering intense

Optical terminal analysis of a multigrating tiled compressor in a PW-class CPA-laser

维普期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第1期21卷 254-259页

作者： Yang Yu-Chuan Luo Hui Wang Xiao li fu-quan Huang Xiao-Jun Jing Feng College of Optoelectric Science and Engineering National University of Defense TechnologyChangsha 410073China Research Center of Laser fusion China Academy of Engineering PhysicsMianyang 621900China

In the highest-power chirped-pulse amplification lasers, the pulse must be stretched in time, amplified, compressed in a grating compressor and subsequently focused by off-axis parabola to obtain a high peak power. In the optical terminal, the temporal and spatial effects of mismatched multigrating tiled compressor on the far-field pulse are critical factors to be analysed. In this paper, a k-space raytracing model is proposed for the temporal and spatial analyses of possible errors in a four-grating single-pass tiled compressor. The results show that the last grating affects mainly the partial focal spot, while the middle two gratings affect the temporal waveform, and the partial focal spot needs much higher error control than that in the temporal domain in a picosecond pulse compression.

关键词： high-power chirped-pulse amplification lasers optical terminal multigrating tiled com-pressor off-axis parabola

Effect of Air Gap on Dual-Tripler Broadband Third-Harmonic Generation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第2期27卷 135-137页

作者：韩伟王芳王礼全贾怀庭王伟李富全冯斌向勇李恪宇钟伟 Research Center of Laser fusion China Academy of Engineering Physics Mianyang 621900

We experimentally study the effect of the air gap on conversion efficiency and the spectrum of generated third-harmonic pulses in the dual-tripler broadband third-harmonic generation scheme. The experimental results are in good agreement with predictions that the 4-cm air gap is equivalent to a full cycle of phase mismatch among the three interacting pulses （i.e. the fundamental, second-harmonic and third-harmonic pulse）. The experimental results also show that the spectrum of the third-harmonic pulse is sensitive to the air gap. We also point out that the air gap effect can be ignored when the dual-tripler system is located in 1000 Pa atmosphere. These results will guide the design of the broadband third-harmonic generation system in high power lasers.

关键词： Chinese climate network complex systems small world community

Low Noise Readout Circuit for Biosensor SoC

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 2008年第2期14卷 69-74页

作者： PAN Yin-song KONG Mou-fu li Xiang-quan WANG li Key Lab of Ministry of Education of Photoelectric Technique and System Chongqing University Chongqing 400030 CHN

Presented is a low noise interface circuit that is tuned to the needs of self-assembly monolayers biosensor SoC. The correlated double sampling(CDS) unit of the readout circuit can reduce 1/f noise, KTC noise and fixed noise of micro arrays effectively. The circuit is simulated in a 0.6 μm/level 7 standard CMOS process, and the simulated results show the output voltage has a good linearity with the transducing current of the micro arrays. This is a novel circuit including four amplifiers sharing a common half-circuit and the noise reducing CDS unit. It could be widely used for micro array biosensors.

关键词： readout circuit SoC low noise biosensor

A Theoretical Studies on the Thermolysis Mechanism of α-Aminonitrile

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1992年第4期8卷 480-482页

作者： HONG San-guo and li fu-quan (Department of Chemistry, Jiangxi Normal University, Nanchang, 330027)fu Xiao-yuan (Department of Chemistry, Beijing Normal University, Beijing, 100875)

Introduction α-Aminonitrile(or aminoacetonitrile) is a kind of reactive bioorganic molecules, and it may exist in insterstellar clouds. its importance lies in that a-aminonitrile may play a role in the generation of large carbon-nitrogen chain molecules. By means of flash vacuum thermolysis and gas-solid reaction (FVT-GSR) tech-nique, Guillemin, et al., studied the thermolysis of a-aminonitrile, they considered that the elimination of HCN (shown as following) is a key step in many reactions of α-

关键词： Thermolysis α-Aminonitrile Transition state IRC path

在线全文

学校读者我要写书评

暂无评论

什叶派与巴林政治变局

西北大学学报（哲学社会科学版） 2014年第1期44卷 64-69页

作者：李福泉西北大学中东研究所陕西西安710069

巴林以什叶派为主力的抗议活动具有多种特点,造成了重大影响。巴林逊尼派少数统治什叶派多数的"国情"决定了其抗议活动的教派特征,什叶派日益强烈的权利诉求是巴林政治变革的最大动力。由于多种因素的作用,巴林什叶派问题的解决必定要... 详细信息

巴林以什叶派为主力的抗议活动具有多种特点,造成了重大影响。巴林逊尼派少数统治什叶派多数的"国情"决定了其抗议活动的教派特征,什叶派日益强烈的权利诉求是巴林政治变革的最大动力。由于多种因素的作用,巴林什叶派问题的解决必定要经历一个漫长的过程。

关键词：巴林什叶派政治变局

在线全文

学校读者我要写书评

暂无评论

伊拉克哈希姆王朝的什叶派政策及其影响

史学集刊 2015年第2期 10-17页

作者：李福泉陕西师范大学历史文化学院陕西西安710119

奥斯曼帝国解体后,什叶派曾试图主导伊拉克的政治走向,但英国殖民者却扶持费萨尔为代表的逊尼派阿拉伯人执掌伊拉克政权,致使什叶派在国家的初次权力分配中处于极为不利的境地。1921年,哈希姆王朝建立后,伊拉克政府打击什叶派乌里玛,削... 详细信息

奥斯曼帝国解体后,什叶派曾试图主导伊拉克的政治走向,但英国殖民者却扶持费萨尔为代表的逊尼派阿拉伯人执掌伊拉克政权,致使什叶派在国家的初次权力分配中处于极为不利的境地。1921年,哈希姆王朝建立后,伊拉克政府打击什叶派乌里玛,削弱什叶派圣城的影响,收买什叶派部落酋长,消除波斯人势力,进而巩固了逊尼派阿拉伯人对国家的主导权,致使什叶派彻底边缘化。哈希姆王朝的政策塑造了逊尼派阿拉伯人支配什叶派的权力结构,不利于伊拉克的社会整合,成为日后教派矛盾的潜在诱因。

关键词：伊拉克哈希姆王朝什叶派

在线全文

学校读者我要写书评

暂无评论

中东什叶派“新月”的形成及其影响

宁夏社会科学 2011年第1期 74-78页

作者：李福泉西北大学中东研究所陕西西安710069

伊战后,伴随着什叶派主导伊拉克政权,中东形成了从伊朗延伸至黎巴嫩的什叶派"新月"。共同的宗教信仰为什叶派"新月"提供了认同基础,伊战后新形势下美国和逊尼派的威胁与压力则是其成型的根本原因。什叶派"新月"改变了中东两大教派的力... 详细信息

伊战后,伴随着什叶派主导伊拉克政权,中东形成了从伊朗延伸至黎巴嫩的什叶派"新月"。共同的宗教信仰为什叶派"新月"提供了认同基础,伊战后新形势下美国和逊尼派的威胁与压力则是其成型的根本原因。什叶派"新月"改变了中东两大教派的力量对比关系,提高了什叶派的战略地位和政治影响,导致波斯与阿拉伯民族争夺的加剧,致使地区政治进一步教派化。什叶派"新月"的形成是中东地缘政治中的一个重大事件,标志着中东国际关系进入了新一轮的变动期。

关键词：中东什叶派新月逊尼派伊朗

Inquiry into Problems of Farmers' Employment under the Condition of Land Transfer

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2011年第5期3卷 22-27页

作者： JIN li-fu,RAN Shuang-quan College of Humanities,Jiangsu University,Zhenjiang 212013,China

This paper emphasizes the urgency of solving the problems of farmers' employment under the condition of land transfer,indicating that solving the problems of farmers' employment is the necessary requirement of land transfer,the actual requirement of constructing well-off society comprehensively,and the objective requirement of transforming developmental *** characteristics of the problems of farmers' employment under the condition of land transfer are as follows:the rural surplus labor forces increase,and the ubiquitous unemployment is urgent;the employment room of farmers is narrow,and the structural unemployment is serious;the ability of farmers' employment is poor,and recessive unemployment has a large proportion;the situation of farmers' employment is not so sanguine,and the policy unemployment is *** paper points out the causes of farmers' employment problems under the situation of land transfer as follows:in terms of analysis of subjective factors,farmers' self-employment ability is yet to be underpinned;in terms of analysis of objective factors,the relevant mechanism of government is ***,corresponding countermeasures and suggestions are put forward as follows:establish the mechanism of farmer traceability analysis under the condition of land transfer;strengthen the training of farmers' skills;reinforce the publicity and education of farmers' employment concept;promote the process of urbanization and construct the employment vehicle of farmers;adjust the industrial structure in rural areas and expand the internal employment in rural areas;improve macro regulation and improve the employment environment for farmers.

关键词： Land transfer Farmer The problems of employment Ch

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中东世俗化的阶段及特点

宁夏社会科学 2010年第1期 75-79页

作者：李福泉西北大学中东研究所陕西西安710068

中东世俗化进程大致经历了四个阶段。19世纪到一战,为世俗化的起源时期;一战到二战,为大规模推进时期;二战到20世纪70年代,为深化时期;20世纪70年代末至今,为"反复"时期。中东世俗化有四大特点:第一,外力驱动,被迫进行;第二,政府自上而... 详细信息

中东世俗化进程大致经历了四个阶段。19世纪到一战,为世俗化的起源时期;一战到二战,为大规模推进时期;二战到20世纪70年代,为深化时期;20世纪70年代末至今,为"反复"时期。中东世俗化有四大特点:第一,外力驱动,被迫进行;第二,政府自上而下强制推动;第三,世俗化的结果是伊斯兰教的国家化;第四,历经反复与挫折,面临重重困难。如何协调和平衡宗教与世俗的关系,依然是中东国家所面临的一个重大难题。

关键词：中东世俗化伊斯兰教土耳其