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Search Results: 1 - 10 of 254776 matches for " 李阳 "
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铋系高T_c相晶格反常行为的穆斯堡尔谱研究

科学通报 , 1992,
Abstract: 一、引言 自从A15金属型超导体被发现后,人们一直在探索可能导致高温超导转变温度的超导机制。高T_c氧化物超导体Y-Ba-Cu-O、Bi-Sr-Ca-Cu-O和T1-Ba-Ca-Cu-O的相继问世,使人们对这一中心课题更加关注。为了系统地研究探讨超导机制,人们首先注意到传统超导
从断层岩的角度认识泥岩涂抹及其定量表征――以济阳坳陷东辛油田营32断层为例

地质学报 , 2009,
Abstract: 从断层岩入手,分析了断层岩与断层封闭性的相关性,进一步建立起断层岩纵向类型变化与断层封闭性的关系。根据断层岩的类型及含油气沉积盆地的埋深,把泥岩涂抹类型分为未成岩塑性剪切型泥岩涂抹及成岩脆性研磨型泥岩涂抹。根据岩石纵向流变性,把断层封闭性分为浅层高渗封闭开启段、中层碎裂封闭开启段及下层韧性变形封闭段,并加以对比与剖析。探讨了泥岩涂抹定量表征问题,指出不同泥岩涂抹类型应采取的计算方法及目前研究中存在的问题。对东辛油田营32断层的泥岩涂抹研究表明,该断层南段几个重要含油层位的封闭性不好,导致油气穿越断层,发生了油气再运移,而北段所有含油层位都是封闭的。这说明了同一条断层封闭的差异性及动态性。
一类不确定离散多时滞大系统稳定控制和保成本分析

内蒙古大学学报(自然科学版) , 2015, DOI: 10.13484/j.nmgdxxbzk.20150213
Abstract: 在不确定范数有界的情况下,给出了一类大规模不确定离散多时滞系统的鲁棒稳定性新的充分条件,进一步给出相应的保成本控制.采用lyapunov方法,结合线性和双线性矩阵不等式(lmi和bmi)技术,设计出闭环系统的状态反馈鲁棒控制器,给出保成本凸优化算法流程.最后通过仿真案例验证了该方法的正确性和有效性.
主流媒体多语种新闻传播引导力分析——以KBS多语种新闻为例 Analysis of the Guiding Force of the Main-stream Media's Multilingual News Dissemination:in the Case of KBS Multilingual News

- , 2017,
Abstract: 随着新闻传播引导力作用的凸显,各国媒体新闻纷纷以个性化时效性的输出,为受众提供着日趋完善的信息服务。近期韩国主流媒体KBS在国内外制作的大量有引导力的新闻节目,给各领域受众注入了诸多新闻传播导向元素。通过数据和案例,分析KBS多语种新闻传播研究的背景、KBS多语种新闻传播引导力、KBS提高多语种新闻传播引导力的措施等,认为韩媒KBS多语种新闻传播的引导力是影响受众立场的重要因素
关于差错信息的若干问题探讨
,
图书情报工作 , 2014,
Abstract: ?从信息视角探讨差错信息的内涵及其特征、差错信息对组织发展的负面和正面影响。认为对差错信息进行管理可以最大限度地减轻甚至消除差错带来的不良影响,提出通过培育积极的差错管理文化、化解信息失灵、构建差错报告系统3个措施,增强员工提供差错信息的意愿。指出对差错信息及其管理的研究应成为信息管理学科的新领域。
分数阶导数双边空间微分方程的显式差分解法
Finite Difference Methods for Space-Time Fractional Two-Sided Space Partial Differential Equations
 [PDF]

, 宁平, 陈璐
Operations Research and Fuzziology (ORF) , 2012, DOI: 10.12677/orf.2012.21001
Abstract:
分数阶微分方程作为广义的微分方程,被广泛地应用于物理,信息处理,金融等领域。本文给出了数值求解时间空间分数阶导数的双边空间微分方程的一种显式差分格式,并对其稳定性和收敛性进行了理论分析。
Fractional order differential equations are generalizations of classical differential equations. Now, they are widely used in the fields of physics, information; finance and others. In this paper, an explicit finite difference method for space-time fractional two-sided space partial differential equations is established. Be- sides, the stability and convergence order are analyzed.
农村炉灶对室内空气品质的影响研究
The Impact of Rural Cooking Range on Air Quality
 [PDF]

王哲,, 奇峰, 苏州
Advances in Environmental Protection (AEP) , 2014, DOI: 10.12677/AEP.2014.43010
Abstract:

本研究以辽宁省营口市一户农村家庭为研究对象,利用MCH-383SD CO2浓度/温、湿度记忆仪对其夏季室内外空气品质进行连续监测,以二氧化碳评价分指数对炉灶使用前后对人舒适感的影响进行评价,研究农村炉灶对室内空气品质的影响并探讨其改善方法。研究结果表明:农村炉灶的使用降低了室内空气品质,且不同房间受到的影响各异;通过对示踪气体CO2浓度与换气次数的线性拟合,得出其具有良好的线性相关性,基于本研究提出改善农村住宅室内空气品质的措施
This research targets a rural family in Yingkou City, Liaoning Province, utilizing MCH-383SD carbon dioxide concentration/temperature, humidity monitor to constantly monitor its Indoor Air Quality (IAQ) in summer, evaluates the influence of using stove on human comfort using evaluation of sub-indices of CO2, and studies the impact of rural cooking range on air quality and discusses the approaches to improve the air quality. The result indicates that the utility of rural cooking range decreases indoor air quality and the impact on it varies from house to house; meanwhile, a good linear dependence between the concentration of

考虑网络时延的水电站网络化AGC系统模型研究
Study of Networked AGC System Model in Hydropower Station Considering Network Delay
 [PDF]

王波,, 延频
Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.46032
Abstract:
介绍了网络化AGC系统的结构以及网络时延的特性,讨论了传统水电站AGC系统的模型。通过对网络时延模型及其仿真模块的分析,建立了考虑网络时延的新AGC系统模型。运用MATLAB/Simulink软件进行仿真模拟,结果表明采用网络时延的新模型对网络时延具有较好的控制性能,可以达到较为满意的控制效果。
The structure and the network delay characteristics of networked AGC system are introduced and the models of traditional hydropower station AGC system are discussed in detail. Based on the analysis of network delay model and its simulation module, a new AGC system model considering network delay is proposed. Simulating by using MATLAB/Simulink software shows that the new model can achieve satisfactory control effect, which has a good control of network delay.
基于Zedboard的WLI图像缩放算法的硬件设计
Hardware Design of WLI Image-Zooming Algorithm Based on Zedboard
 [PDF]

许世, 董航,
Computer Science and Application (CSA) , 2015, DOI: 10.12677/CSA.2015.56025
Abstract:
本文选择了一种新颖的图像缩放算法进行FPGA硬件实现。该算法基于奇偶分解的思想,具有复杂度低、硬件需求小和缩放效果良好等突出优点。首先利用MATLAB对该算法进行了功能验证,然后用缩放耗时、PSNR、边缘模糊等级和脉冲噪声等指标评估基于该算法图像处理效果。与传统时域算法作对比,对比结果表明该算法在处理效果和运算速度上的优异性。基于Zedboard开发板,运用Vivado HLS高级综合工具将算法的C程序综合成硬件IP,并搭建了包含ARM处理器和VGA等模块的软硬协同验证系统。实验验证了图像缩放算法硬件设计的正确性和实用性。
A novel zoom algorithm is researched and further realized by a FPGA board. The algorithm is of low complexity, low hardware requirements, and wonderful zoom result thanks to even-odd de-composition method. First, function of the algorithm was verified by MATLAB. Second, zoom results of pictures were evaluated using PSNR, time consuming, edge fuzzy grade, and impulse noise. Compared to the conventional algorithm in the time domain, the even-odd decomposition method has advantages on zoom quality and computational efficiency. Based on Zedboard, we wrote C program of WLI image zoom algorithm and used high level synthesis tool Vivado HLS to generate the IP from the program. Then, a software and hardware co-verification system was constructed including modules such as ARM processor, VGA controller. Finally, hardware design of the zoom algorithm using even-odd decomposition method was proved correct by experiments.
4种神经心理学量表在阿尔茨海默病早期诊断中的应用比较研究
 ,小凤
重庆医科大学学报 , 2014,
Abstract: 目的:评估4种神经心理学量表在阿尔茨海默病(Alzheimer’sdisease,AD)早期诊断中的应用价值。方法:对109例受试者:AD组24例、轻度认知功能损害(mildcognitiveimpairment,MCI)组40例、正常认知(normalcognition,NC)组45例,采用记忆及执行功能筛查量表(memoryandexecutivescreening,MES)、听觉词语学习测试华山版(auditoryverballearningtest-Huashanversion,AVLT-H)、简易智能状态量表(mini-mentalstateexamination,MMSE)、蒙特利尔认知评估量表(Montrealcognitiveassess-mentscale,MoCA)4种量表测试,对测试结果进行比较分析。结果:每种量表评分在3组间均具有统计学差异(P<0.01);AVLT-H短延迟回忆及长延迟回忆与文化程度无显著相关性(P>0.05);以MES评分80分为临界值诊断MCI的敏感度及特异性分别为95.6%和75.0%,AVLT-H长延迟回忆取4分为临界值诊断MCI的敏感度及特异性最高(100.0%和99.84%)。结论:MES及AVLT-H对AD早期具有很高的诊断价值且不受文化程度影响。
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