我国综合性文献光盘数据库的比较研究   总被引：6，自引：0，他引：6  

何建新 《中国图书馆学报》1997,23(1)

我国综合性文献光盘数据库的比较研究●何建新ＡＢＳＴＲＡＣＴＡｃｏｍｐａｒａｔｉｖｅｓｔｕｄｙｉｓｃｏｎｄｕｃｔｅｄｏｎｔｈｅｔｗｏｋｉｎｄｓｏｆｄｏ－ｍｅｓｔｉｃｃｏｍｐｒｅｈｅｎｓｉｖｅｏｐｔｉｃａｌｄｉｓｃｄａｔａｂａｓｅｓ：ｔｈｅ＂ｄａｔａｂａ...  相似文献   

论转型期我国政府诚信建设     

赵丽 《四川职业技术学院学报》2009,19(2)

政府诚信问题是转型期中国的一大突出问题.由于受传统人治观念的影响、政府职能转变不到位、各种体制与制度及法律不健全等原因,目前我国政府诚信状况不容乐观.政府诚信建设是建立和完善整个社会诚信体系的核心,对转型期的中国来说,已迫在眉睫.因此需要从管理理念、法制保障、宣传教育、监督制约以及政府建设等诸多方面加强政府诚信建设.  相似文献   

Characterization of a-Si:H/SiN multilayer waveguide polarization using an optical pumping application—LED   总被引：1，自引：1，他引：0  

Mohd Saiful Dzulkefly Zan  Isamu Kato  Mohammad Syuhaimi Ab-Rahman  Seri Mastura Mustaza 《浙江大学学报(A卷英文版)》2009,10(10):1421-1427

This paper describes the fabrication of a waveguide and the analysis of its polarization characteristics by applying light-emitting diode （LED） pumping lights to its surface. By using double tubed coaxial line （DTCL） microwave plasma chemical vapor deposition （MPCVD） equipment, an a-Si：H/SiN multilayer waveguide was fabricated whose thickness could be controlled at nanometer order. The main structural material of the waveguide sample consisted of a combination of layers of amorphous silicon hydrogen and silicon nitrate. Once the sample was ready, another major objective of the experiment was to analyze the polarization characteristics of the fabricated waveguide. The idea of the experiment was to analyze how the waveguide reacts when three types of LED （blue, yellow, and red） are radiated onto its surface. The results showed that the fabrication of the a-Si：H/SiN sample is successful. Most effective transmission results, which accord with the polarization characteristics analysis, were obtained.  相似文献   

In-vivo retinal imaging by optical coherence tomography using an RSOD-based phase modulator     

Ling Wang  Zhi-hua Ding  Guo-hua Shi  Yu-dong Zhang 《浙江大学学报(A卷英文版)》2009,10(4):607-612

Fourier-domain rapid scanning optical delay line （RSOD） was introduced for phase modulation and depth scanning in a time-domain optical coherence tomography （TD-OCT） system. Investigation of parameter optimization of RSOD was conducted. Experiments for RSOD characterization at different parameters of the groove pitch, focal length, galvomirror size, etc. were performed. By implementing the optimized RSOD in our established TD-OCT system with a broadband light source centered at 840 nm with 50 nm bandwidth, in vivo retina imaging of a rabbit was presented, demonstrating the feasibility of high-quality TD-OCT imaging using an RSOD-based phase modulator.  相似文献   

论杜牧“以才学为诗”     

彭笑远 《毕节学院学报》2009,27(3)

安史之乱后,盛唐诗风不复存在,大诗人杜甫开"诗世界",即开创"宋调"先声;中唐韩愈进行诗歌解构,颠覆盛唐诗已有的艺术规范;晚唐杜牧继承杜甫、韩愈开创的新诗风,并在诗歌创作中加以实践,成为了开"宋调"的另一位大诗人.宋人严羽概括的"以文为诗"、"以才学为诗"、"以议论为诗"等宋型诗要素在他诗歌创作中已有明显的表现.其"以才学为诗"主要表现为:在诗中大量用典;在自己诗中加注;好在诗中用奇字僻词,化用经学语句.杜牧"以才学为诗"的形成.与其个性、家学、时代有着密切关系,并对后世产生了深远影响.  相似文献   

基于OpenGL的三维图形绘制和3D建模     

杨键  陈利学  龚捷 《教育技术导刊》2009,8(7):168-170

介绍了利用OpenGL实现三维图形绘制的基本编程框架和方法,对OpenGL中光照、材质、投影等关键技术的应用方法进行了重点阐述。简要介绍了利用3D Studio Max构建复杂模型,以降低用OpenGL构造复杂模型难度、减少建模工作量的方法。  相似文献   

Effects of bicycle frame ergonomics on triathlon 10-km running performance     

Ian Garside  Dominic A. Doran 《Journal of sports sciences》2013,31(10):825-833

It is perceived that, during the triathlon or duathlon, cycling with a steep (>76°) rather than a shallow (?76°) frame geometry might attenuate the fatigue associated with progression from the cycle to run disciplines and improve subsequent 10-km running performance. This is based on anecdotal testimony from athletes purporting to have experienced improved performance; no empirical evidence exists. To evaluate this view, eight male triathletes completed a counterbalanced, 40-km cycle ride at two frame geometries (73° and 81°) at ~70% VO 2peak . Immediately after completion of each 40-km cycle, a self-paced 10-km treadmill time trial was undertaken, during which physiological, kinematic and performance variables were measured. The 10-km run performance (mean - s : 42:55 - 4:19 vs 46:15 - 4:52 min; P ? 0.01) and combined cycle and run performance (1:45:49 - 5:45 vs 1:50:33 - 6:08; P ? 0.001) were faster in the 81° than the 73° condition. Improvements in performance were most prominent during the first 5 km of the run (21:41 - 2:15 vs 24:15 - 2:31 min in the 81° and 73° conditions respectively). These improvements were not evident during the second 5 km of the run. No differences in physiological variables were noted, although heart rate, stride length and stride frequency were increased during the 81° condition ( P ? 0.05). Modifying frame geometry from a seat tube angle of 73° to 81° improves 10-km running and combined cycle plus run performance. These improvements in performance might relate to alterations during the cycling phase, which minimizes the 'residual effect' of this (i.e. the adverse changes in substrate availability, thermoregulatory, cardiovascular and biomechanical factors felt immediately after transition from cycling to running) and attenuates negative changes in physiological and kinematic responses during the 10-km run.  相似文献   

光无源接入网络发展方向     

罗杰 《大众科技》2013,(4):31-33

FTTH是宽带接入网发展的必然趋势,OFDM-PON作为一种容量大,成本低、安全性高、易于管理的接入网技术,被认为是高速、安全接入的一种最佳解决方案,文章介绍了当前的GPON、EPON、WDM-PON和OFDM-PON的原理及优缺点,综合考虑应用场景和未来需求情况下提出OFDM-PON将会是接入网的最佳解决方案。  相似文献   

Effect of processing parameters on the electromagnetic radiation emission during plastic deformation and crack propagation in copper-zinc alloys     

KUMAR Rajeev  MISRA Ashok 《浙江大学学报(A卷英文版)》2006,7(11):1800-1809

INTRODUCTION The physics of plastic deformation and crack propagation at atomic level is complex but is essential for the development of new materials. This requires an understanding of the atomic level phenomena associated with the plastic deformation. In this con- text, emission of electromagnetic radiation (EMR) during plastic deformation and crack propagation in metals and alloys, and generation of transient mag- netic fields during crack initiation in ferromagnetic materials are rep…  相似文献   

Nanophotonics and negative ε materials     

THYLN Lars  BERGLIND Eilert 《浙江大学学报(A卷英文版)》2006,7(1)

  相似文献