Home OALib Journal OALib PrePrints Submit Ranking News My Lib FAQ About Us Follow Us+
 Title Keywords Abstract Author All

Publish in OALib Journal

ISSN: 2333-9721

APC: Only \$99

Submit

2019 ( 247 )

2018 ( 6358 )

2017 ( 6585 )

2016 ( 7072 )

Search Results: 1 - 10 of 329816 matches for " 王强 "
 Page 1 /329816 Display every page 5 10 20 Item
 Pure Mathematics (PM) , 2013, DOI: 10.12677/PM.2013.36055 Abstract: 本文在分析了三次样条插值里三转角算法的基础上，对第二种边界条件的情形进行了推广，研究了此情形下任意两插值点二阶导数已知的样条函数的解法。文章的最后，通过一个例子，说明了此计算方法。>In this article, based on analysis of three turning angles algorithm of cubic spline interpolation, the cubic spline interpolation is generalized on the condition of the second boundary. The methods are presented on the condition that the second derivative of arbitrary two nodes is given. At the end of the article, this cal- culation method is illustrated through an example.
 Modern Physics (MP) , 2013, DOI: 10.12677/MP.2013.31005 Abstract: 毛细管放电软X射线激光或极紫外光刻光源研究中等离子体的电离价是一个重要的参量，它决定光源的波长。依据毛细管放电的特点以及参考文献中提供的数据推导出毛细管放电氩等离子体电离价的经验公式。利用国内首台毛细管放电极紫外光刻光源演示装置研究了氩等离子体的光谱，实验表明峰值~28 kA的脉冲电流对30 Pa氩气放电或峰值~34 kA的脉冲电流对40 Pa氩气放电都产生了Ar7+。而公式计算出30 Pa和40 Pa时分别需要24.4~39 kA和32.7~52.3 kA的峰值电流。这说明经验公式具有一定的实用意义。 Ionized degree of Ar plasma in capillary discharge soft X-ray laser or Extreme Ultraviolet Lithographic (EUVL) source research was an important parameter which determined the wavelength of the plasma source. According to the characteristics of capillary discharge and the data from literature, we deduced an experiential expression of ion-ized degree of Ar plasma in capillary discharge by analogy method. With the first set of capillary discharge EUVL source demonstrative device in China, the spectra of Ar plasma was studied. It was found from experiment that either 30 Pa Ar gas discharged by peak pulse current of -28 kA or 40 Pa Ar gas discharged by peak pulse current of -34 kA could produce Ar7+ ion. While the simulating results showed that it was necessary for the 30 Pa and 40 Pa Ar gas to be ionized to Ar7+ ion by peak pulse current of 24.4 - 39 kA and 32.7 - 52.3 kA respectively. These results proved that the experien- tial expression had some definite practical significance.
 Modern Physics (MP) , 2013, DOI: 10.12677/MP.2013.31004 Abstract: Ar气气压是毛细管放电软X光激光研究中的关键参量，其对激光的产生机理和输出等发挥重要的作用。本文通过系统地研究Ar气气压对激光输出的影响，发现当Ar气气压从38 Pa升高到65 Pa时，激光信号的最大输出值确实从~17 V提高到~18.4 V。但前提条件是适当地增大预脉冲电流，并适当地延长预–主脉冲延时，使主脉冲电流能够更充分地利用良好的预电离等离子体状态，获得增益系数较大的激光介质。这些研究工作对进一步优化放电参量，提高激光的输出功率等具有重要的意义。 Ar pressure was such a key parameter in capillary discharge soft X-ray laser research that it played important role in generating mechanism and output and so on of laser. Through systemic investigation of the impact of Ar pressure on laser output in this article, it was found that the maximum output of laser signal had really been increased from ~17 V to ~18.4 V when Ar pressure went up from 38 Pa to 65 Pa. But the prerequisite was to increase the pre-current pulse and to prolong the delay time between pre- and main-current pulse properly which could make the main-current pulse utilize the better state of pre-ionized plasma adequately and obtain the laser medium with larger gain coefficient. These research works had important significance in optimizing the discharge parameter further and improving the output power of laser and so on.
 Journal of Security and Safety Technology (JSST) , 2013, DOI: 10.12677/JSST.2013.12002 Abstract: 在实际工程设计中，多数结构工程设计人员并未重视高层建筑结构嵌固端的选择。这样往往会造成材料浪费，也会给高层建筑结构留下隐患。对于高层建筑结构嵌固端的定义，部分结构设计人员也存在误区，认为是力学嵌固，其实应为强度嵌固。规范对地下一层顶板作为嵌固端明确了要求。本文对三种地下室平面面积型式不同的高层建筑结构嵌固端做了初步的探讨，得出了一般情况下，不同地下室平面型式嵌固端的位置，并得出了地上一层与相关范围地下一层侧向刚度比是衡量地下一层顶板能否作为高层建筑结构嵌固端的关键。In the practical engineering design, structural engineering staffs did not attach importance to fixed end of high-rise building structure. This will cause material waste, and will also leave hidden troubles to the high-rise building structure. Some of the structural designers have mistakes in the definition of fixed end of the tall building, who regard them as mechanics embedment, but in fact it should be strength-mounted. Specification makes requirements clearly about the roof of the underground layer as embedding end. In this paper, three basement flat area types of high-rise building structure embedded end have been studied. It comes to conclusions 1) there are different embedding positions in different basement flat forms under normal circumstances, and 2) the lateral stiffness ratio of ground floor with the relevant range of underground floor is the key to measure whether the basement roof can be used as a high-rise building structure embedded fixed end.
 王强 地理科学进展 , 1996, Abstract: 1 概述 包括人为因素在内的土地覆盖与土地利用变化比较实例分析能够说明几个不同的任务: 1)在土地覆盖与土地利用中将生物物理与人为作用两个方面结合起来; 2)勾划出全球土地利用现状和动态的最终目录框架; 3)在全球土地分类和建立土地覆盖模型工作中,要考虑分析人为因素的影响; 4)为决定在未来全球土地覆盖与土地利用变化经验研究工作中,世界上什么地区应该优
 王强 第四纪研究 , 1991, Abstract: The present paper summarized preliminarily the geological events at 2.50 Ma B.P.inChina.These events include the following:the Qinghai-Xizang (Tibet) Plateau was upliftingas the Indian Plate was underthrusting the Eurasian one,i.e.the start of the 4th Episode ofHymalaya Movement at the same time,the Sanggan-Fenwei fault depression zone in NorthChina and the Tan (cheng)-Lu(jiang) fault system in East China,which all have a trend ofNNE direction,were rising as the extruding effects of North America Plate,the stratigraphichiatus with different degrees occurred on the marginal areas of the two tectonic units;theloess accumulation had occurred;up to now the mammalian fauna of 2.50—1.80 Ma B.P.havenot been determined in north China,it seems to be that there was a discontinued fauna sequen-ce;microclass-aerolite occurred near the boundary between loess and Pliocene red soil in Luo-chuan section of Shaanxi Provinces as well as the horizons of the same time at the boreholes inthe eastern plain of Beijing,it appears that there was the occurrence of astronomical activity;in the northern part of Huaihe River Plain of Anhui Province,the juncture area of the nor-thern and southern climatic zones in China,as well as the Yanqing Basin,Beijing,at 2.50 MaB.P.the pollen of subtropical vegetation increased abruptly;in the terrestrial ostracod faunaCyprinotus formalis Schneider and Ilyocypris qingxuensis Wang disappeared for non-ecologi-cal reason.In the world at this time the paleo-oceanological situation have many changes andthe vegetation,mammalian fauna and tectonic movement also have great changes in manyareas.The thermal system in the world came to the phase with short period (100000—150000a) oscillation.From the long geological cycle it can be seen that the climatic situation since 2.50 Ma B.P.might be the inevitable outcome in the evolutional process of the Earth;from the short geolo-gical cycle it can be seen that the geological events at 2.50 Ma B.P.are the outcome of platemovement,change of magnetic field and geoid change.But the determination of energy sys-tem can only be obtainel from the solar system.According to the astronomical principle it canbe convinced that there are many factors affecting the atmosphere circulation.At the westerlyin the North Hemisphere the distribution of the average troughs and ridges might have formedat 2.50 Ma B.P.,providing a base for the formation of monsoon;as in the lacustric,glacialand loess sequences it had been determined that the climatic change was related with the solarradiation,so that it has been convinced that the Earth's track had changed.The cycle,seasonand tensile angle of the Planetary Synod also play important role for the time,cycle andrange of the temperature changes.The geological events at 2.50 Ma B.P.marked the Earth had come to a phase when the re-lationship between the Earth and the Solar became closer;frequent changes with large ampli-tude is the reflection of the frequent changes of the entire Solar
 王强 第四纪研究 , 1999, Abstract: 随着末次冰消期以来气候转暖，海平面上升，地下水水位亦随之上升，自裸露的内陆架向滨海平原依次形成湿地，生长挺水、湿生植物（主要是芦苇、香蒲），后又被人侵的海水淹没，遂成为海侵层序的基底泥炭。泥炭明显呈黑色（照片1），易于辨别。在渤海西岸随67个钻孔钻探，笔者已在7个钻孔泥炭层中见丽蚌tomprotulasp．壳体（照片2），巨极少见海相微体生物，表明泥炭为滨海平原淡水湿地沼泽沉积，极少受到海水影响。泥炭最厚20cm左右，除在海侵边缘区见其中含大量植物根系外，大多泥炭因多泥质而较坚硬，仅在筛洗后见植物根系碎片。由于各孔…
 王强 科学通报 , 2000, Abstract: 研究发现北大别山中酸性灰色片麻岩中存在ａｄａｋｉｔｅ型岩石，其地球化学特征表现同Ａ１２Ｏ３，Ｓｒ，Ｓｒ／Ｙ和Ｌａ／Ｙｂ，低Ｙ，Ｙｂ和Ｓｃ，Ｓｒ正异常，铕正异常或微弱负异常，北大别山ａｄａｋｉｔｅ型灰色片麻岩由俯冲大洋板片融形成，已有的研究表明大别山灰色片麻岩主要分布于大别山且形成于印支期前，因此北大别山ａｄａｋｉｔｅ型灰色片麻岩的存在扬子和华北板块印支期碰撞前存在大洋板片的俯冲，洋壳是向北大别山下
 王强 中国科学 地球科学 中国科学 地球科学 , 2002, Abstract: ？通过对扬子地块东部与Cu-Au等金属成矿有关的燕山期侵入体岩进行元素和同位素地球化学研究,揭示出:(ⅰ)扬子地块东部许多与金属成矿有关的侵入岩为埃达克质岩,它们可能主要由玄武质下地壳物质在增厚的条件下熔融形成,玄武质岩浆的底侵作用可能为这些岩石的形成提供了热量:(ⅱ)高压(1.2～4.0GPa)、高温(850～1150℃)的下地壳环境不仅有利于流体的产生,而且也有利于埃达克质岩浆的产生.形成于高压高温条件下的埃达克质岩浆不仅能够携带大量流体和Cu-Au等成矿金属物质,而且易于将这些物质带到地壳浅处,有利于Cu-Au等金属矿床的形成.
 王强 法学家 , 2012, Abstract: 建构包涵罪量因素的犯罪构成体系，涉及罪量因素在犯罪论体系中的定位问题。罪量因素难以整体作为处罚条件；只有行为获利等不法中立的罪量因素，应当作为犯罪成立的第四要件——真正的客观处罚条件；而丢失枪支不报、滥用职权等罪中的“严重后果”、“重大损失”，是可罚违法程度的表征，属于不法构成要素，只是此类后果与行为之间客观关联上的特殊性，而无法还原为典型的危害结果，对此类后果只须有认知预见，无须考虑意志因素，即可认定故意成立，因而是一种非典型的不法构成要素；其余绝大多数罪量因素均可还原为身份、行为、结果等典型的不法构成要素。罪量构成要素在事实和价值层面的特性，使它区别于可罚的违法性等理论和罪体构成要件要素。
 Page 1 /329816 Display every page 5 10 20 Item