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Search Results: 1 - 10 of 144763 matches for " 高伟敏 "
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PRESENT SITUATION AND PROTECTION METHODS OF CO2 CORROSION
CO2腐蚀的研究现状及其控制措施

李晓,
腐蚀科学与防护技术 , 2009,
Abstract: The corrosion mechanism,influential factors and protection methods were reviewed in this paper,with emphases on the existing problems of CO2 induced corrosion and its protection,namely,the influence of the existent corrosion products on the corrosion mechanism and on the corrosion protection by corrosion inhibitors.
CO2腐蚀的研究现状及其控制措施
李晓,
腐蚀科学与防护技术 , 2009,
Abstract: 综述了CO2腐蚀的机理、影响因素及所采取的防护措施.重点归纳和阐明了当前对CO2腐蚀研究及防护中存在的问题,即腐蚀产物层的存在对腐蚀机理和添加缓蚀剂防腐时所带来的影响.
地球物理勘探方法在工程勘察中的综合应用
,焕平,
西北地质 , 2010,
Abstract: 简要阐述了目前在铁路、公路等工程勘察中广泛应用的浅层折射地震层析及高密度电法两种物探勘探手段的工作方法原理。通过在新建兰新铁路勘察项目中的综合应用实例,说明只要在工作中选择合适的观测参数和解释方法,结合钻孔等相关地质资料,对相对较浅的地质构造、水文地质、小断裂构造及不良地质现象的分布、形态及规模等均可进行较为详细勘察。加上两种方法成果相互验证,不仅提高了勘察精度及可靠性,同时也为铁路、公路等建设施工提供了可靠依据。
?广义动态系统观测器的参数化
,吴亚军,
天津大学学报(自然科学与工程技术版) , 2003,
Abstract: ?通过使用受限等价变换,研究了广义动态系统观测器的构造问题,提出了观测器参数化新的表达形式,并分析了其结构机理,最后给出了一个数值例子*得到的观测器参数化结果可用于解决广义动态系统最优h2/h∞滤波问题以及鲁棒观测器的设计问题.已知的正常系统的相应结果可以作为本文结果的特殊形式.
求解tsp问题的一种改进的+进制mimic算法
郝承,
计算机科学 , 2012,
Abstract: 十进制mimic算法是基于mimic二进制编码算法思想的可用来求解tsp的离散分布估计算法。着重考虑该算法在较大规模"i'sp问题上的算法缺陷,对其编码方式和概率模型进行了改进,提出了新的个体生成策略,在初始化种群阶段使用了贪心算法,在进化过程中引入了杂交算子、变异算子、映射算子、优化算子等演化算子,采用了动态调整方法来确定优势群体的规模。以上改进使得算法在小种群解大规模"i'sp问题的情况下仍可保持种群的多样性。实验结果表明,改进算法在求解规模、求解质量和寻优速度上都有明显提高。
自发走神和有意走神及其与元认知的关系
刘兆,,罗湘齐
- , 2017,
Abstract: 摘要: 走神包括有意走神和自发走神两种类型,而元认知对二者的影响可能不同。研究使用两维度走神量表和元认知-30量表,对国内部分高校学生的走神和元认知(元认知信念、元认知加工和认知自信判断)进行调查,结果显示:(1)走神包括有意走神和自发走神两种类型;(2)失控和危险感既可以预测自发走神也可以预测有意走神,但认知自信只能预测自发走神,认知的自我意识只能预测有意走神。说明元认知对自发走神和有意走神的影响存在差异。
Abstract: Recent research has demonstrated that mind wandering can be subdivided into spontaneous and deliberate types. The former involves spontaneous, involuntary and uncontrollable process, and the latter is often characterized as a deliberate, intentional and controllable process. According to the standard view of interaction between mind wandering and metacognition, metacognition serves to correct the wandering mind, suppressing spontaneous thoughts and bringing attention back to more “worthwhile”’ tasks. This view is based on the state level. However, to date, no attempts have been made to evaluate the relationship between metacognition and these subtypes of mind wandering at trait level. The aim of this study was to investigate the effect of metacognition on spontaneous and deliberate mind wandering. A survey was conducted online by a total sample of 197 college students. They completed two questionnaires. One is the Mind Wandering Scale, which consist of a Deliberate Mind Wandering Scale (MW-D) and a Spontaneous Mind Wandering Scale (MW-S) (Carriere, Seli, & Smilek, 2013). The other scale is the Metacognition Questionnaire-30 (MCQ-30), which was based on the longer original version of the same instrument (Cartwright-Hatton & Wells, 1997).The MCQ-30 measures beliefs about thinking and thinking processes on five subscales(positive beliefs, uncontrollability and danger, cognitive confidence, need to control thoughts, and cognitive self-consciousness). A confirmatory factor analysis was calculated to test the common method variance. Results indicated that the single-factor model was not suitable, making sure the study is accurate enough in terms of common method variance. The results showed that: (1) the confirmatory factor analysis yielded a two-component solution, indicated that two factors of mind wandering( c2/df=1.98,RMSEA=0.073,TLI=0.97,CFI=0.98) were best captured by a distinction between spontaneous mind wandering and deliberate, willful mind wandering. (2) Metacognition was positively correlate with MW-D,and MW-S. Two factor of metacognition( cognitive confidence,uncontrollability and danger) were both correlate with MW-D and MW-S. (3)A stepwise multiple regression analysis was conduct to evaluate the unique contributions of each metacognition factor to the subtypes of mind wandering. A dissociation between mind-wander
The Safety Management of Web Site ASP
Web网站ASP的安全管理

ChenMin GaoHuawei,
,

现代图书情报技术 , 2002,
Abstract: ASP technology is one kind of new technology developing the dynamic Web site at present, and extensive used in the development of various specialization Web sites. How of manage ASP's application procedure in order to avoid suffering attacking and destroys is an important question the people must faced with. How the Web site of use ASP's technology carries on the various limits of authority to manage, and how to adopt the safe various safe leak of measure jam, and eliminates the technology method of safe hidden trouble has been expounded by this article.
表面状态和处理对涂层下A3钢腐蚀和涂层失效的影响
徐永祥,严川,
腐蚀科学与防护技术 , 2003,
Abstract: 采用模拟大气腐蚀装置,用挂片法研究了不同表面处 理和表面状态、不同湿度对涂层失效的影响.通过对基体金属的腐蚀形貌观察,微区元素分析,并结合傅利叶变换红外光谱(FTIR),研究了金属在涂层下的腐蚀产物和涂层结构的变化.同时探讨了金属在涂层下的腐蚀和涂层失效机理.
一种高效的域间证书路径构建算法
,海英,杨义先
北京邮电大学学报 , 2006, DOI: 10.13190/jbupt.200605.28.shiwm
Abstract: 域间证书路径的构建是一个非常复杂的过程,至今还没有一种非常有效的算法。针对此问题本文基于图论的理论思想提出了一种高效的证书路径构建算法,与其它同类算法相比,该算法使域间的证书路径构建更加简单、高效,且具有很强的扩展性。此外,该算法也适用于其它的信任模型。
飞机侧壁部件装配调姿机构的设计与分析
马政,李卫东,,
北京航空航天大学学报 , 2014,
Abstract: 分析了等曲率和变曲率2类飞机侧壁部件的几何特点以及对柔性装配调姿的功能需求,设计了一种新型的面向大型飞机侧壁部件数字化装配的柔性工装机构;该机构基于精密三坐标定位器对侧壁部件进行装配调姿,可等效为6自由度并联机构,通过4条支撑臂对侧壁部件进行夹持;定位器呈前后2排、前低后高布局,能够实现对侧壁部件空间6自由度位姿调整;对工装机构进行了位姿反解,根据侧壁部件的初始位姿和目标位姿反向求解出各支撑臂的关节变量,并利用计算机仿真模型进行了验证,证明了反解算法的正确性,为侧壁部件调姿运动的精确控制奠定了基础.
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