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Search Results: 1 - 10 of 105775 matches for " 施文 "
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测地声模连续谱参量激发过程的数值研究
Numerical Study of the Parametric Excitation of the Geodesic Acoustic Mode Continuum by Drift Wave
 [PDF]

余俊,
Applied Physics (APP) , 2012, DOI: 10.12677/APP.2012.23017
Abstract:

为了验证Yu和Dong给出的解析结果的合理性,用数值计算的方法对离子温度为非均匀的等离子体中测地声模连续谱的非线性激发过程进行了研究。数值计算的结果表明,漂移波边带模的径向结构分布图与简谐振荡都很接近,这说明Yu和Dong对参量激发方程的解析求解的出发点是合理的。对于一定的离子温度分布,在一定共振频率的条件下,测地声模连续谱的增长率与漂移波的振幅的平方成正比,这和Yu和Dong给出的相关的解析结果的结论一致。根据所求出的漂移波边带模的径向分布,可以计算出测地声模的径向结构分布。计算的结果表明,测地声模连续谱的振幅在共振点附近具有最大值。
The growth rate of the geodesic acoustic mode and the radial structures of the sideband drift waves and the geodesic acoustic modes continuum are studied as a parametric process in the tokamak plasmas with a non-uniform ion temperature profile for which the non-uniform part of the inherent geodesic acoustic mode frequency takes the form of sin function. It is shown that the radial structures of the drift wave sideband are close to the harmonic function, the en- ergies of the geodesic acoustic modes are mainly localized around the resonant points of the parametric excitations, and the growth rate is proportional to the square of the amplitude of the pump wave, which indicates that the corresponding analytical results is reasonable.

鼠心钠素基因的化学合成

科学通报 , 1988,
Abstract: 心钠素(Atrialnatriureticfactor)是最近几年发现的存在于哺乳动物心脏等器官中的一种多肽激素,它具有强大的利钠、利尿、舒张血管和降低血压的作用,因此,它在治疗高血压和心功能不全方面可能有着重要意义。本文报道了用化学方法合成鼠心钠素基因。
一种基于共同向量结合2DPCA的人脸识别方法
, 鹏飞
自动化学报 , 2009, DOI: 10.3724/SP.J.1004.2009.00202
Abstract: ?提出了一种基于共同向量结合2维主成分分析(2-dimen-sionalprincipalcomponentanalysis,2DPCA)的人脸识别方法.共同向量由图像通过Gram-Schmidt正交变换而求得,具有该类图像共同不变的性质.原始图像与该类共同向量之间的差分向量通过2DPCA处理,依据最小距离测试得到识别结果.实验在ORL和Yale人脸数据库进行测试,结果表明本文提出的方法有较好的识别性能.
八角莲及其近缘属植物叶表面的电镜扫描观察
张敏,
中国中药杂志 , 1998,
Abstract: 目的:以扫描电镜观察八角莲及其近缘植物叶表面特征,用于鉴定。方法:对7种八角莲属植物及2种近缘植物的叶表面特征,以电镜扫描方法进行观察。结果:9种植物上下表皮的电镜扫描特征均不同,并列出检索表及照片。结论:电镜扫描结果可用于鉴别八角莲及其近缘植物。
双波长紫外光谱法测定双J酸中J酸

分析化学 , 1988,
Abstract: 染料中间体双J酸中混有J酸,J酸的存在对最终染料的色光产生明显影响。A.A.Rafael用纸层析分离-紫外荧光鉴别-萃取-分光光度法测定J酸和双J酸混合物。J.H.Knox用高效液相色谱法分离J酸和双J酸。本文提出双波长紫外光谱法测定双J酸中J酸,该方法具有不经分离,简便、快速等优点。
无线电数传系统中微机应用的探讨

电力系统自动化 , 1987,
Abstract:
可光固化星形超支化聚酯的合成与表征

高分子学报 , 1997,
Abstract: 描述了基于季戊四醇和1,2,4苯三甲酸酐,经由甲基丙烯酸缩水甘油酯和甲基丙烯酸酐改性的系列超支化聚酯的“发散”合成方法,即合成反应从“中心核”开始,逐步向外扩展,控制链增长,每个分子形成具有大约8,12和16个甲基丙烯酸酯双键的超支化臂。这种星形聚酯分子具有三维球状结构,不会产生分子链间的缠结,在辐射固化涂层和粘合剂等领域具有广阔的应用前景.
一次右旋风暴三维结构分析
全?
气象 , 1979, DOI: 10.7519/j.issn.1000-0526.1979.03.014
Abstract:
2017年全国中考体育测试全景研究
An Overall Research of Chinese Physical Test for 2017 Senior High School Entrance Exam


- , 2018, DOI: 10.19582/j.cnki.11-3785/g8.2018.08.014
Abstract: 摘要:采用文献资料法、数据收集法、数理统计法 、对比分析法对2017年全国70座不同层次城市中考体育测试项目、评分标准、分值构成、政策依据等方面做对比分析,以期全面解读全国中考体育测试概貌,探寻科学、合理中考体测构架。研究结果表明:1).每一座城市中考体测政策的发布机构均为教育行政部门——体卫艺处(科);2).全国所有城市均把体育测试成绩纳入中考总成绩中,纳入分值最低20分,最高80分,占中考总分比例在5%-10%之间;3).中考体测涉及到的测试项目男生有51项,常用10项,女生有51项目,常用10项;4).各地基本参照《国家学生体质健康标准(2014年修订)》选项目、定分值;5).横向比较各城市间满分、及格标准差异非常大;6).一般选用的测试方法是必测+选测;7).有约58.57%的城市通过一次性中考体育测试给出中考体育分数,有32.85%的城市按照平时+统考相结合的方式给出学生最终中考体育成绩,8.57%的城市给出等级评价。
Abstract: By using the methods of literature review, data collection and statistics, this paper makes a contrastive analysis and a full picture on sports test items, grading standards, the composition of scores, policy basis and so on in 2017 of 70 different levels Chinese cities, tries to comprehensively interpret the national sports test profile and explore the scientific and rational frame of sports test of senior high school entrance exam. Results: 1) The issuing institution of each city's examination and measurement policy for sports test of senior high school entrance exam is the education administrative department, that is Sports Health and Art Education Division (Section); 2) all the Chinese cities take the sports test results into the total score of senior high school entrance exam, with a range from the lowest scores of 20 points and the highest of 80 points, accounting for 5% -10% of the total scores of the senior high school entrance exam; 3) there are 51 items for male students, of which 10 are commonly used items, and 51 items for females, of which 10 are commonly used items; 4) all the tests basically pick items and settle scores according to the National Students' Physical Health Standards (revised in 2014); 5) the full marks and pass standards among all the cities are differed; 6) the generally test includes compulsory test plus optional test; 7) about 58.57% cities give sports examination scores through the one-time test, 32.85% cities giving final score through a combination of at-school routine test and the sports test, and 8.57% cities give a level rating
一种改进的动物线粒体DNA提取方法
,立明
动物学研究 , 1993,
Abstract: 线粒体DNA(mtDNA)已被广泛用于动物群体遗传学和进化生物学的研究,并取得了许多有意义的结果。有效的mtDNA提取方法无疑是开展这方面研究的前提。关于动物mtDNA的提取方法,国内外已有不少报导。概括起来,可分为:1)氯化铯超速离心法,2)柱层析法,3)DNase法,4)碱变性法。本文报道了一种改进的碱变性提取法,与其它方法相比,具有应用范围广、简便、经济等优点。
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