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Search Results: 1 - 10 of 284275 matches for " 张荣 "
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循环动荷载下路基红粘土安定行为研究
Study on Shakedown Behavior of Subgrade Red Clay under Cyclic Loading
 [PDF]

廖化,
Advances in Geosciences (AG) , 2013, DOI: 10.12677/AG.2013.33026
Abstract:
本文根据设计改装的循环动单轴压缩试验,通过不同含水率、不同轴向应力水平、不同循环加载次数及不同应力加载路径的试验,研究路基红粘土的安定行为、迟滞行为以及塑性力学行为等。结合能量耗散的分析,探讨了路基土在循环动载荷作用下的力学行为发展规律,分析了影响循环荷载作用下路基红粘土力学行为的主要因素,从变形机理上探讨土的应力应变关系以及塑性变形模式,能明确界定红粘土路基在循环荷载下的临界应力状态范围及所容许的塑性应变,可有效的预测路面随荷载次数累积的车辙,以减少因车辆所造成的车辙破坏,为红粘土路基改良及路面厚度设计提供参考依据,提升路面管理的效能。
This paper describes the shakedown, hysteretic and plastic behavior of cohesive subgrade soil under cyclic loading. Based on the energy dissipation principle, the various mechanic behaviors of subgrade red clay are discussed by repeated loading test. The test was performed in various conditions of subgrade soil. Different moisture content, stress level, the number of repeated loading and stress path are taken into account during the test. According to the test results, the factors that contribute to various mechanic behaviors of subgrade soil are analyzed in detail. In addition, the study presents a discussion on stress-strain relation and plastic deformation model of subgrade red clay with deformation principle. The mechanism of permanent deformation is explained in light of shakedown and hysteretic behavior.
发挥内部审计职能优化公司治理结构

财会月刊 , 2006,
Abstract: 一、内部审计在公司治理中的作用  1.对董事会的服务职能。法人治理结构的一个显著特征就是经营权与所有权相分离,董事会是公司内部控制系统的核心。目前,我国很多上市公司建立了董事会、监事会,但在实际运行中,真正的法人治理结构并未建立,董事会的监控和指导作用严重弱化。面对日益变化的环境,企业内部审计可以利用其对企业相关政策和内部经营较为熟悉的优势,对发现的问题予以披露并提出整改建议,为董事会的决策提供依据。同时内部审计可利用其接触面广的特点,及时把有关部门的困难、问题和意见公正地反馈给董事会,发挥其沟通上下级的作用。在对下属企业实施审计的过程中,应就其经营和管理方面存在的问题提出审计建议,使股东及其他利益团体的利益真正受到保护。
南京大学张荣副校长在庆祝施士元先生百岁寿辰暨文集发布会上的讲话

现代物理知识 , 2007,
Abstract: 二○○七年九月十九日尊敬的施先生亲属,尊敬的各位来宾、各位校友,老师们、同学们:大家上午好!今天我们齐聚一堂,共同庆祝施士元先生的百岁寿辰,并庆祝施先生的文集《施士元———回忆录及其他》的出版。首先,请允许我代表南京大学党委和行政,向施先生表示最诚挚的敬意和最衷心的祝贺!向前来参加庆祝活动的施先生的亲属们、向各位嘉宾和校友们表示最热烈的欢迎!施先生是我国著名的核物理学家,是我国最早从事核谱学研究的学者之一,学术造诣精深、科研成就卓越。作为居里夫人唯一的中国物理学学生,施先生在巴黎大学镭研究所工作期间,与居里夫…
地铁深基坑施工对邻近高压铁塔的影响

重庆交通大学学报(自然科学版) , 2011, DOI: 10.3969/j.issn.1674-0696.2011.supp2.030
Abstract: :?采用有限元数值分析方法,模拟地铁深基坑开挖对邻近高压铁塔的影响,提出合理的基坑设计方案、铁塔加固措施和施工方法。
水质权重综合指数对水源水评价的探讨

中国公共卫生 , 1989,
Abstract: ?水质权重综合指数法(WQIK),是依据水质指标的不同分别权重(即理化类指标权重、有机污染类指标权重、毒理类指标权重)。本文介绍的方法适用于毒理指标超标的水源水的评价。现介绍如下:1评价模式的建立1.1监测项目的分类监侧项目按《生活饮用水水质标准》的分类分别权重,即将感官性状和一般化学指标划归为理化类权重,毒理学指标划为毒理类权重(建议放射性指标也划归此类),细菌学指标及NH4-N}NO2-N,COD等划归为有机污染类权重。
基于串联型自抗扰控制器的逐次求精法

重庆大学学报 , 2000, DOI: 10.11835/j.issn.1000-582X.2000.05.034
Abstract: 利用模型补偿自抗扰控制器辨识系统参数,对于低阶系统取得了满意的辨识效果。但在用上述方法进行高阶系统参数的辨识时,还存在扩张状态观测器参数不易调整的问题。笔者将串联型扩张状态观测器构成的自抗扰控制器运用于参数辨识的逐次求精法,能有效地辨识出系统的参数。特别是在辨识高阶系统参数时,具有扩张状态观测器在数易调的优点。
香砂六君子汤合黄芪建中汤加减治疗慢性胃炎76例

中国中医药信息杂志 , 2007,
Abstract:
基于AIS数据的船舶异常行为检测方法
Abnormal Vessel Behavior Detection Based on AIS Data
 [PDF]

树波, 唐强
Artificial Intelligence and Robotics Research (AIRR) , 2015, DOI: 10.12677/AIRR.2015.44004
Abstract:
船舶行为检测是海事监控和管理的重要内容,它对于船舶安全航行、港口正常作业生产、海洋环境保护和防止各种水上非法活动具有重要意义。随着越来越多的船舶安装了AIS系统,大量AIS数据的积累为研究船舶运动规律和进行船舶异常行为检测提供了新的途径。本文对近年来AIS数据在船舶异常行为检测方面的研究进展和所取得的成果进行总结和评述,分析了现有方法存在的问题和面临的挑战,指出了AIS数据在船舶异常行为检测方面的主要研究方向。
Maritime behavior detection is critical for maritime surveillance and management. It is important for ship’s safe sailing, normal production at ports, marine environmental protection, water illegal activities prevention and so on. With more and more AIS systems are installed on board, massive amounts of AIS data have been accumulated, which provides us with promising ways to investigate the law of ship motions and the detection of abnormal behaviours. In this paper, various algorithms used for detecting abnormal behaviours of ship are reviewed and commented, and the challenge of researchers in this field faced is then pointed out, in the end, the perspectives in this realm are also proposed.
基于贝叶斯网络的船舶引航风险预警
Risk Warning for Ship Pilotage Based on Bayesian Networks
 [PDF]

树波, 唐强
Modeling and Simulation (MOS) , 2016, DOI: 10.12677/MOS.2016.52006
Abstract: 船舶引航是水上交通运输的重要环节,它对于船舶安全进表出港、港口正常作业、环境保护和提升国家港口形象等方面具有重要意义。船舶引航是一个复杂的过程,它与人、船舶和环境等各种因素密切相关,研究各种因素对引航安全的影响以及这些因素之间的相互关系,动态识别船舶引航风险,有利于及时采取措施,确保船舶安全进出港。本文提出一种用于船舶引航风险预警的贝叶斯网络模型,通过文献调研和对专家进行深度访谈,利用专家知识和文献资料的信息确定网络的拓扑结构和相关参数。用SamIam软件建模并对一些船舶引航案例进行分析,结果表明本文的贝叶斯网络能够对船舶引航过程的相关风险做出正确的预警,具有实际应用的价值。
Ship pilotage is an important process of marine traffic transportation, as it is critical to in-and-out port ships, port operations, environmental protection and the image of national port. The pilotage is a complicated process, which is involved with human, vessel and environment. Investigating the elements that influence the safety of ship pilotage, and the relationship among these elements will help to take appropriate measures for safety pilotage. In this study, we developed a Bayesian net-work for pilotage risk warning based on literature investigation and deep interview with experts. The structure and parameters of the network were determined from expert knowledge. The vali-dation experiments were conducted on SamIam and a dozen of real pilotage cases were used to test our network. The experimental results show that the proposed network can correctly predict the risk in case of dangers and is promising for practical application.
等效刚度法在车体垂向振动频率计算中的应用研究
Application of Equivalent Stiffness in Vertical Vibration Frequency of Car Body
 [PDF]

张萌, 硕韶, 孙海
Open Journal of Acoustics and Vibration (OJAV) , 2016, DOI: 10.12677/OJAV.2016.43005
Abstract:
本文采用等效刚度法,将铁道车辆车体这种复杂结构等效为等截面梁;应用弯曲变形能相等的原理,结合车体特征,并引入了相关修正系数,得到了车体的等效惯性矩Ie。以铁木辛柯梁的振动频率计算公式为依据,并在长度方向上对车体的面积及剪切形状系数进行了修正,得到了最终的计算公式。将简单车体及某型高速车体的参数代入公式,并将计算得到的结果与有限元结果进行了对比,证明了计算方法的可靠性,为车体垂弯频率的计算提供一种参考计算方法。
The railway vehicle car-body can be equivalent to the uniform beam with a method of equivalent stiffness. Equivalent inertia moment Ie can be calculated with bending strain energy equality the-ory and a related coefficient according to car-body structure. With the Timoshenko beam theory and some models, a final formula is obtained. A simple car-body model and a high-speed car-body model are calculated with above method, and there are acceptable errors between analytical and finite element results, which is a reference method for car-body design.
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