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Search Results: 1 - 10 of 300673 matches for " 张雨晴<br>CHEN Jiang "
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现代口腔美学因素分析
Analysis of Current Esthetic Factors in Oral Science.

陈江, 张雨<br>CHEN Jiang, ZHANG Yu-qing.
- , 2018, DOI: 10.13701/j.cnki.kqyxyj.2018.10.001
Abstract: 摘要 随着患者需求的发展,口腔修复已由功能性修复转向口腔功能性美学修复。虽然国内的口腔医师已逐渐树立口腔美学观念,但由于颌面部组成复杂,其中美学区牙列与牙龈解剖结构微妙、口内结构与唇部的动态关系难以把握,正侧貌的参考线角较多,使得口腔美学的临床应用极为困难,口腔修复难以达到理想的美学效果。本文通过对颌面美学影响因素进行重点分类系统阐述,拓展口腔美学修复的临床应用
Weights-directly-determined and Structure-adaptively-tuned Neural Network Based on Chebyshev Basis Functions
一种权值直接确定及结构自适应的Chebyshev基函数神经网络

ZHANG Yu-nong,CHEN Yu-long,JIANG Xiao-hua,ZENG Qing-dan,ZOU A-jin,<br>张雨,陈裕隆,姜孝华,曾庆淡,邹阿金
计算机科学 , 2009,
Abstract: A model of neural network based on Chebyshev basis functions was presented to remedy the drawbacks exi-sting in conventional BP neural networks,such as,slow learning rate,local minima,and difficulties in determining optimal structure.The values of the weights in such a neural network can be quickly determined by the proposed weights-direct-determination method.The structure of such a neural network canalso be adjusted automatically according to the required precision.Theoretical analysis and simulation resu...
OBSERVATION OF MICROCRACKS PATTERNS IN WESTERLY GRANITE SPECIMENS STRESSED IMMEDIATELY BEFORE FAILURE BY UNIAXIAL COMPRESSIVE LOADING
Westerly花岗岩试样单轴压缩破坏瞬时微裂纹观察

CHEN Youqing,<br>陈友
岩石力学与工程学报 , 2008,
Abstract: Microcrack development patterns in Westerly granite specimens stressed immediately before their ultimate failure by uniaxial compressive loading are observed using the fluorescent method proposed by Nishiyama and Kusuda(1994). Applying this method,the microscopic crack growth patterns,such as cleavage cracks within feldspar grains and intracrystalline cracks in quartz grains,and the wide-area distributions of these cracks are simultaneously confirmed with accuracy and ease. As a result of the observations,the elongated contiguous cracks estimated to have a direct impact on the final failure of granite are identified;and these cracks are roughly classified into three types. It is inferred that these three types of cracks do not develop at the same time;and each type has a different mechanism of generation. The mechanism of crack development under uniaxial compression is suggested to occur as follows. Firstly,many microcracks running parallel to the loading direction are induced by loading. Next,long cracks are induced by the elongation and coalescence of these microcracks located near the sides of the specimen. Then,the sides move outward due to further loading,generating the fault plane. The cracks within the relatively less damaged remaining parts are linked and propagated;and finally,these cracks induce the failure of specimen.
Sigmoid function-based layered multicast with intra-layer rate adjustment
基于sigmoid函数的层内速率调节的分层组播

CHEN Qing,<br>陈
计算机应用 , 2007,
Abstract: Instead of re-layering and re-allocating sending rates, multi-rate multicast with intra-layer rate adjustment distributes layer's sending rate into fixed intervals and adjusts the actual layer's sending rate within its interval according to the selected delegate of the layer group. The synthesized probability formula based on sigmoid function was proposed for delegate selection. Two factors determine whether the current feedback receiver can be selected or not. One is the relative difference between feedback rate and current layer sending rate, the other is the approximate rate distribution of receivers within this layer group. Simulation results show that SFBLM can meet most of receivers' demand within a layer group, and it is TCP friendly.
Monte carlo simulation of magnetization and coercivity of free magnetic clusters
Huang Zhi-Gao,Chen Zhi-Gao,Jiang Li-Qin,Ye Qing-Ying,Wu Qing-Yun,<br>黄志高,陈志高,蒋丽钦,,吴青云
中国物理 B , 2006,
Abstract: Based on Monte Carlo method, the oscillatory behaviour of the average magnetic moment as a function of the cluster sizes and the temperature dependences of magnetic moment with different sizes have been studied. It is found that the oscillations superimposed on the decreasing moment are associated with not only the geometrical structure effects but also the thermal fluctuation. The hystereses and thermal coercivities for free clusters with zero and finite uniaxial anisotropies have been calculated. The simulated thermal dependence of the coercivity is consistent with the experimental result, but does not fit the Tα law in the whole temperature range. It is evident that an easy magnetization direction and an anisotropy resulting from the spin configurations exist in the free clusters with the pure exchange interaction, which is also proved by the natural angle and energy distribution of clusters. A systematic theoretical analysis is also made to establish the relationship between natural angle and coercivity.
致密碎屑岩裂缝性储层预测方法综述
张雨,王志章
科技导报 , 2010,
Abstract: 致密碎屑岩裂缝性油气藏储量在低渗透储层总储量中占很大比例。致密碎屑岩裂缝性储层成为油气勘探开发研究的重要对象。当前,致密碎屑岩裂缝性油气藏勘探开发的最大难点在于如何对储层裂缝的发育程度和分布范围进行预测。准确进行裂缝预测对致密碎屑岩裂缝性储层的油气开发具有重要意义。本文对致密碎屑岩裂缝预测的方法进行了系统分析,从地质分析法、曲率法及构造应力场模拟、地震裂缝识别技术、测井裂缝识别技术和生产动态分析法5个方面对当前致密碎屑岩裂缝预测的主要研究方法现状进行了详细阐述,简要描述了各种方法的优缺点和应用条件;结合当前科学技术总体进展,指出致密碎屑岩裂缝预测研究的两个方面的发展趋势单一的裂缝预测技术需要不断创新、综合多种方法各自的优势进行系统预测。
Cultural Limitations of the Fundamental Attribution Error
基本归因错误的文化局限性

Li Chen,Chen Wuqing,<br>李陈,陈午
心理科学进展 , 2006,
Abstract: 基本归因错误曾被社会心理学家认为是人类普遍具有的一种归因倾向,然而,文化心理学的研究却发现:不同文化脉络中的人表现出不同的归因倾向,确切地说,归因实际上会受到文化的影响,即便是所谓的基本归因错误亦具有文化局限性.进而言之,文化心理学的研究打破了以往心理学中关于人们的基本认知过程和方式具有文化普遍性的思维定式.由此看来,心理学研究只有立足于一定的社会文化脉络,才能更好地理解和把握人类的心理和行为.
Development and Application of PTSD and IES in Survivors after Disaster
灾后民众创伤后应激障碍(PTSD)与事件冲击量表(IES)的发展和应用

WU Kan-Kan,ZHANG Yu-Qing,Peter Tianzhi Chen,<br>吴坎坎,张雨
心理科学进展 , 2009,
Abstract: 本文简单回顾了国际上在创伤后应激障碍研究中较常使用的自评测量工具——事件冲击量表(IES)及其修改版(IES-R)和儿童版CRIES的发展和应用。并综合报道了在四川绵竹运用IES-R对956名受灾群众进行的测查结果。推论,5·12汶川地震后,将有大约一半的幸存者在一到两个月出现PTSD的主要症状,并具有比较显著的性别差异:女性的分数普遍高于男性,建议及早进行心理危机干预。
苏里格气田苏x井区盒8段砂体识别及含气性预测研究
张雨,王志章,张娜
天然气地球科学 , 2011,
Abstract: ?苏里格气田苏x井区盒8段储层非均质性强,常规预测方法效果差。为了进行研究区砂体识别及含气性预测,提出了一种综合叠前及叠后2类储层预测技术优势的联合预测方法。首先,应用叠后地震属性分析及岩性随机反演方法,进行了盒8段砂体识别,在此基础上,结合沉积特征分析确定了研究区盒8段的沉积微相展布规律;其次,借助地震子波吸收系数分析、avo分析及叠前弹性参数反演3种方法得到含气性分析成果,在剖面上进行了异常点段的含气性解释;最后,综合盒8期沉积微相的平面分布特征及剖面上的含气性分析成果,对研究区含气有利区进行了综合评价。实际钻井结果表明:该联合预测方法较好地克服了单一常规预测方法的不足,有效地降低了预测结果的不确定性,取得了较佳的预测效果,为进一步的勘探开发部署提供了更为可靠的依据。
Convergence Properties Analysis of Gradient Neural Network for Solving Online Linear Equations
梯度神经网络实时求解线性方程组之收敛性分析(英文)

ZHANG Yu-Nong CHEN Zeng-Hai CHEN Ke,<br>张雨,陈增海,陈轲
自动化学报 , 2009,
Abstract: A gradient neural network (GNN) for solving online a set of simultaneous linear equations is generalized and investigated in this paper. Instead of the earlier-presented asymptotical convergence, global exponential convergence could be proved for such a class of neural networks. In addition, superior convergence could be achieved using power-sigmoid activation-functions, compared with using linear activation-functions. Computer-simulation results substantiate further the above analysis and efficacy of such neural networks.
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