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Search Results: 1 - 10 of 388633 matches for " 王晓慧 "
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效应代数的局部E-自同构
Local E-Automorphisms on Effect Algebras
 [PDF]

张海燕,
Pure Mathematics (PM) , 2012, DOI: 10.12677/PM.2012.23024
Abstract: 本文证明了维数大于等于3的可分Hilbert空间H的效应代数E(H)上的每个满的2-局部E-自同构是E-自同构以及Jordan代数Bs(H)上线性满的2-局部E-自同构是Jordan自同构,并且都具有\"\"的形式,其中U是酉算子或反酉算子。
In this paper, it is proved that each su
颞下颌关节弹响与咀嚼肌功能紊乱相关性研究
Association between Articulation Mandibularis Clicking and Masticatory Muscles Functional Exercise
 [PDF]

素梅, , 杨建军
Hans Journal of Biomedicine (HJBM) , 2016, DOI: 10.12677/HJBM.2016.64005
Abstract:
目的:比较咀嚼肌功能锻炼和超短波理疗治疗颞下颌关节弹响的效果。探讨颞下颌关节弹响发生的可能机制。方法:选择128例弹响患者,随机分为实验组和对照组,每组64例。实验组行咀嚼肌功能锻炼,对照组行超短波理疗,疗程两周,随访3个月。比较两种方法的治疗效果。结果:2周后,实验组的64例患者弹响全部消失,总有效率100%;对照组的64例患者33例弹响消失,20例弹响次数减少,11例弹响次数无改变,总有效率82.81%,两组结果有显著性差异(P < 0.05),3个月后,治疗组随访率95.31%,对照组随访率93.75%,治疗组总有效率100%,对照组总有效率66.67%,两组结果有显著性差异(P < 0.05),3月后对照组治疗总有效率下降(P < 0.05)。结论:咀嚼肌功能锻炼治疗颞下颌关节弹响的效果优于超短波理疗,咀嚼肌功能锻炼治疗颞下颌关节弹响的疗效显著。
Objective: To compare the clinical therapeutic efficacy of masticatory muscles functional exercise and ultra-short wave therapy, and investigate a possible pathological mechanism about articulation mandibularis clicking. Methods: 128 patients with articulation mandibularis clicking were selected and divided into two groups (experimental group and control group) of 64 patients each randomly. Patients in experimental group were taught to do masticatory muscles functional exercise for 2 weeks. Patients in control group were treated with ultra-short wave therapy for 2 weeks and 3-month follow-up. The therapeutic effects of the two methods were compared. Results: After 2 weeks, symptoms of articulation mandibularis clicking disappeared in 64 patients of experimental group and 33 patients of control group; the total effective rate was 100%; 20 patients in control group showed improvement of their symptoms and 11 patients in control showed no improvement. The total effective rate was 82.81%. There were significant differences between the two groups (P < 0.05). After 3 months, the follow-up rate of the treatment group and the control group was 95.31% and 93.75%, respectively; the total effective rate of treatment group and the control group was 100% and 66.67%, respectively. There were significant differences between the two groups (P < 0.05), and we could see lower therapeutic effect in control group after 3 months (P < 0.05). Conclusions: Masticatory muscles functional exercise could cure articulation mandibularis clicking effectively and it’s a more effective way when compared with ultra-short wave therapy.
文化霸权、教育控制与女性解放——对近代中国教会女学的历史考察

华东师范大学学报(教育科学版) , 2012,
Abstract: 教会女学是中国近代女学重要的组成部分,其在中国历经了三个发展阶段。教会女学的设置目的既与普通教会学校有相同之处又有殊异之处;教会女学建构了显性宗教课程和隐性英美文化场域用以进行教育控制,但女传教士群体对课程进行了“知识加工”;其客观上对中国女性的主体建构进行了一定的启蒙和引导。
雷达遥感在热带林经营中的应用

世界林业研究 , 2005,
Abstract: 随着全球热带雨林面积的急剧减少,对热带林的经营管理日益得到人类的关注。雷达系统以其全天候、全天时、穿透性等功能成为支持森林可持续经营中信息采集的重要工具。文中介绍了用现有技术做雷达影像分析,以及这些技术应用于全球水平、国家水平和森林经营单位水平的森林资源评价和森林资源监测的潜力。
基于战争游戏思想的五力模型分析方法

图书情报工作 , 2011,
Abstract: ?论述五力模型分析方法可以有效检验企业产业环境,针对企业如何运用此方法,提出利用战争游戏方式。实施过程包括准备、实施和汇总三阶段,实施中应注意人员合作、代表性企业确定、专家协调及结果分析等问题。并辅以真实案例,对五力模型分析方法进行阐述,力图促进基于战争游戏思想的五力模型分析方法在企业竞争情报分析中的有效运用。
基于四角模型的战争游戏法分析框架研究

图书情报工作 , 2009,
Abstract: ?针对如何在战争游戏中模拟竞争对手问题,提出战争游戏法分析框架概念。结合战争游戏法分析框架特性,建议将四角模型作为战争游戏法的分析框架。辅以真实案例,对四角模型分析框架的内涵及实施过程进行阐述,并针对四角模型实施中应注意问题加以介绍,最后点明四角模型作为战争游戏法分析框架的限制条件,力图促进战争游戏法在企业竞争情报分析中的有效运用。
菲并咪唑衍生物的化学结构与其热学性质的关系 Relationship between Thermal Properties and Their Chemical Structure in Phenanthroimidazole-Based Material  [PDF]
李继新,,志明
Material Sciences (MS) , 2013, DOI: 10.12677/ms.2013.34031
Abstract: 菲并咪唑衍生物由于优异的热力学性能,在制备深蓝光、双极性、高效率的蓝光材料方面逐渐受到关注。本文在本课题组和多个课题组的研究成果基础上,以1,2-二苯基–菲并咪唑作为菲并咪唑衍生物结构的模型化合物,通过改变咪唑环的1,2号位取代基的位置、结构与链接方式,来研究其对玻璃化转变温度和热分解温度的变化影响规律。分析结果显示,玻璃化转变温度除了随分子空间位阻增大而降低,随共轭程度、平面性的增大而升高外,菲并咪唑的2号位取代对其影响更显著;而热分解温度基本上随着分子质量、共轭程度、分子平面性的增大而增加。这些为高热学稳定的菲并咪唑材料设计提供一定参考。 Phenanthroimidazole and its derivatives have attracted more and more attention in preparing bipolar and high-efficiency saturated blue emitters due to their excellent thermal properties. To discuss the effect on the glass transi- tion temperature and thermal decomposition temperature originating from the chemical structure change in phenan- throimidazole-based material, such as the linked position and different substituent groups, 1,2-diphenyl-phenan- thro[9,10-d]-imidazole is chosen as a model compound based on the current results. By tuning the substituent structure and linked mode in the imidazole ring 1,2-position, some regularities are revealed. The analysis results show that the Tg decreases with the increase of the molecular steric and rises with the increases of conjugated degree and planarity, simultaneously, 2-position of imidazole ring plays a more important role in all substituent positions. The Td is enhanced with the increase of molecular weight, conjugation and molecular planarity. All of these would provide some valuable suggestions for the design of phenanthroimidazole-based materials with excellent thermal properties.
电气化铁路电能质量问题分析
Analysis of Power Quality Issues of Electrified Railway System
 [PDF]

金浩, 徐龙, 冯磊,,, 徐永海
Advances in Energy and Power Engineering (AEPE) , 2016, DOI: 10.12677/AEPE.2016.41001
Abstract:
电气化铁路具有高速化、重载化、能源利用率高、经济效益好等优点。但电气化铁路牵引负荷属于大功率非线性单相负荷,接入电网后会对给其供电的电力系统带来谐波、三相不平衡等电能质量问题,不利于公用电网安全、经济运行。本文首先介绍了电气化铁路接入电网电能质量特性,主要对电气化铁路牵引负荷引起的两大主要电能质量问题谐波和负序进行详细分析;然后对电气化铁路接入电网后产生的谐波、负序对电力系统各环节的影响进行了总结;最后对目前常用的改善公用电网电能质量措施进行分类,为电气化铁路接入电网电能质量评估、治理提供参考依据。
Railway electrification has advantages such as high speed, heavy load, high energy utilization and good economic benefits. But the traction load of electrified railway is a high power, single phase and nonlinear load, its access to the grid will bring about power quality problems such as harmonics, three-phase imbalance which go against safe and economic operation of power system. Firstly after electrified railway connects to power system the characteristics of power quality are introduced in this paper. The main problems, harmonic and negative sequence caused by the traction load of electrified railway, are analyzed in detail. Then, the influence of harmonic and negative sequence on power system is summarized. Finally, the current measures to improve the power quality of the utility grid are classified. A reference is provided for the power quality evaluation and treatment after the electrified railway connects to power system.
输气管道腐蚀的最优灰色组合预测模型
,
腐蚀科学与防护技术 , 2009,
Abstract: 在不等时距序列灰色预测的基础上,提出了适用于输气管道腐蚀的不等时距最优组合灰色预测模型.首先,选用两种模型精度较高的不等时距灰色预测方法建立了输气管道腐蚀预测的单项模型,然后,利用最小二乘意义下的模型误差最小化方法确定出各单项灰色预测模型的权重,建立了最优组合预测模型.此预测模型综合利用了参与组合的各单一模型的有效信息,因而可以更加客观地反映输气管道腐蚀变化趋势.通过实例对比分析结果表明,此模型预测精度较高,可以作为输气管道腐蚀预测的有效工具.
煤的显微构造及其储集性能
,
煤田地质与勘探 , 1998,
Abstract: 利用扫描电子显微镜研究煤中微米级构造变形,揭示了煤的显微构造变形现象,如裂隙,角砾,碎粒,糜棱质,滑移面等。这些显微构造直接影响着的储集性能,裂隙和角砾的增加了煤中的大孔和中孔,提高了有效孔隙率;碎粒和糜棱质增加了煤的比表面积和甲烷吸附量,同时也有充填孔隙,堵塞通道的作用。研究显微构造在理论上可为煤层气生,储,运机理研究提供微观依据;在应用上可成为煤层气资源评价和开采的指标之一。
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