检索结果-南通市图书馆

Mineral formation on dentin induced by nano-bioactive glass

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第9期27卷 1509-1514页

作者： Xu-yan Sheng Wei-Yu Gong Qing Hu Xiao-feng Chen yan-mei dong Department of Cariology and Endodontology Peking University School and Hospital of Stomatology School of Materials Science and Engineering Jingdezhen Ceramic Institute National Engineering Research Center for Tissue Restoration and Reconstruction South China University of Technology

The object of this study was to evaluate the effect of bioactive glass （BG） size on mineral formation on dentin surfaces. Totally demineralized dentin discs were treated using BG suspensions with different particle sizes： i.e., microscale bioactive glass （m-BG）, submicroscale bioactive glass （sm-BG） and nanoscale bioactive glass （n-BG）. Field-emission scanning electron microscopy and 3D profile measurement laser microscopy were used to observe the surface morphology and roughness. It was found that all BG particles could promoted mineral formation on dentin surfaces, while plug-like depositions were observed on the dentin discs treated by n-BG and they were more acid-resistant. The present results may imply that n-BG has potential clinical application for dentin hypersensitivity treatment.

关键词： Bioactive glass Dentin hypersensitivity Mineralization Nano Sol-gel method

A stochastic user equilibrium model solving overlapping path and perfectly rational issues

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2021年第5期28卷 1584-1600页

作者： yan dong-mei GUO Jian-hua Intelligent Transportation System Research Center Southeast UniversityNanjing 211189China

Traffic assignment has been recognized as one of the key technologies in supporting transportation planning and *** better address the perfectly rational issue of the expected utility theory(EUT)and the overlapping path issue of the multinomial logit(MNL)model that are involved in the traffic assignment process,this paper proposes a cumulative prospect value(CPV)-based generalized nested logit(GNL)stochastic user equilibrium(SUE)*** proposed model uses CPV to replace the utility value as the path performance within the GNL model *** equivalent mathematical model is provided for the proposed CPV-based GNL SUE model,which is solved by the method of successive averages(MSA).The existence and equivalence of the solution are also proved for the equivalent *** demonstrate the performance of the proposed CPV-based GNL SUE model,three road networks are selected in the empirical *** results show that the proposed model can jointly deal with the perfectly rational issue and the overlapping path issue,and additionally,the proposed model is shown to be applicable for large road networks.

关键词： stochastic user equilibrium cumulative prospect theory generalized nested logit method of successive averages

在线全文

学校读者我要写书评

暂无评论

弹性半平面问题的变形扰动磁场

北京工业大学学报 2006年第4期32卷 295-300,320页

作者：秦飞闫冬梅北京工业大学机械工程与应用电子技术学院北京100022

为计算机械应力引起的扰动磁场,从磁弹性问题的线性理论出发,导出了结构变形引起的扰动磁场的定解方程和边界条件．采用傅里叶变换方法对受集中力作用半平面问题的变形扰动磁场进行了求解,并对空气中的扰动磁场强度分布及量级进行了讨... 详细信息

为计算机械应力引起的扰动磁场,从磁弹性问题的线性理论出发,导出了结构变形引起的扰动磁场的定解方程和边界条件．采用傅里叶变换方法对受集中力作用半平面问题的变形扰动磁场进行了求解,并对空气中的扰动磁场强度分布及量级进行了讨论．结果表明,空气中扰动磁场的法向强度和切向强度分布特征明显不同,法向强度关于力作用点对称分布,并且在力作用点处达到最大,而切向强度关于力作用点反对称分布,并且在力作用点处有突变;地磁环境下,磁场对位移的影响可以忽略不计;扰动场强与外力成正比．

关键词：磁弹性地磁变形扰动磁场傅里叶变换

Expressions of the γ_2 chain of laminin-5 and secreted protein acidic and rich in cysteine in esophageal squamous cell carcinoma and their relation to prognosis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2011年第1期30卷 69-78页

作者： Li-yan Xue Shuang-mei Zou Shan Zheng Xiu-Yun Liu Peng Wen yan-Ling Yuan dong-mei Lin Ning Lu Department of Pathology Cancer Institute/Hospital Peking Union Medical College Chinese Academy of Medical Sciences Beijing 100021 P. R. China

Previous studies have shown that the expressions of the γ2 chain of laminin-5 and secreted protein acidic and rich in cysteine (SPARC) play important roles in oncogenesis and the development of carcinoma. To assess the expressions of laminin-5 γ2 chain and SPARC in esophageal squamous cell carcinoma (SCC), and to clarify the prognostic significance of the expressions of laminin-5 γ2 chain and SPARC in esophageal SCC, we detected the expressions of laminin-5 γ2 chain and SPARC in cancer tissue and corresponding normal mucosa from 116 patients with advanced (stages II-IV) esophageal SCC using the tissue microarray-based immunohistochemistry and analyzed the correlation of the expressions with clinicopathologic characteristics and survival. We found that in normal esophageal tissues, laminin-5 γ2 chain was expressed in the basement membrane, whereas in esophageal SCC tissues, laminin-5 γ2 chain was expressed in the cytoplasm of carcinoma cells, with a positive rate of 72.4%. SPARC was not detected in normal esophageal mucosa, but was expressed in stromal fibroblasts in 84.6% of esophageal SCC cases and in cancer cells in 7.8% of esophageal SCC cases. There was a significant correlation between laminin-5 γ2 chain and stromal SPARC expression in esophageal SCC (Spearman's rho = 0.423, P < 0.001). The expressions of both laminin-5 γ2 chain and stromal SPARC were correlated with survival (P = 0.032 and P = 0.034, respectively). In stage-II esophageal SCC, the expression of laminin-5 γ2 chain was significantly correlated with survival (P = 0.023), while the expression of SPARC was not significantly correlated with survival (P = 0.154). Patients with elevated levels of laminin-5 γ2 chain and SPARC expressions had a poorer prognosis than did those lacking elevated levels of laminin-5 γ2 chain expression and/or elevated levels of SPARC expression (P = 0.001). In stage-II esophageal SCC, patients with elevated levels of laminin-5 γ2 chain and SPARC expressions had a poorer prog

关键词：层粘连蛋白鳞状细胞癌食管癌半胱氨酸分泌蛋白链表预后蛋白表达

美国先前学习成果与远程大学学分的转化路径探析

在线全文

学校读者我要写书评

暂无评论

职业技术教育 2013年第20期34卷 89-92页

作者：董衍美吉林工程技术师范学院吉林长春130052

美国在先前学习成果认证方面发展相对成熟,其先前学习成果与远程大学学分的转化路径主要有挑战考试、建立学力档案、企业培训项目、专业证书和军事培训项目。这些路径既能满足美国成人接受高等教育的需求,又能节省时间、费用,还能使他... 详细信息

美国在先前学习成果认证方面发展相对成熟,其先前学习成果与远程大学学分的转化路径主要有挑战考试、建立学力档案、企业培训项目、专业证书和军事培训项目。这些路径既能满足美国成人接受高等教育的需求,又能节省时间、费用,还能使他们获得自我提升的机会。其对我国成人教育的启示是:建立成人教育机构之间的学分转化体系,鼓励普通高校开设优质的远程学位教育,颁布相关政策法规,规范成人教育与普通高等教育衔接的管理。

关键词：美国先前学习成果远程大学学分转化路径

An Artificial Intelligence‑Assisted Flexible and Wearable Mechanoluminescent Strain Sensor System

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 217-231页

作者： yan dong Wenzheng An Zihu Wang dongzhi Zhang College of Control Science and Engineering China University of Petroleum(East China)Qingdao 266580People’s Republic of China

The complex wiring,bulky data collection devices,and difficulty in fast and on-site data interpretation significantly limit the practical application of flexible strain sensors as wearable *** tackle these challenges,this work develops an artificial intelligenceassisted,wireless,flexible,and wearable mechanoluminescent strain sensor system(AIFWMLS)by integration of deep learning neural network-based color data processing system(CDPS)with a sandwich-structured flexible mechanoluminescent sensor(SFLC)*** SFLC film shows remarkable and robust mechanoluminescent performance with a simple structure for easy *** CDPS system can rapidly and accurately extract and interpret the color of the SFLC film to strain values with auto-correction of errors caused by the varying color temperature,which significantly improves the accuracy of the predicted strain.A smart glove mechanoluminescent sensor system demonstrates the great potential of the AIFWMLS system in human gesture ***,the versatile SFLC film can also serve as a encryption *** integration of deep learning neural network-based artificial intelligence and SFLC film provides a promising strategy to break the“color to strain value”bottleneck that hinders the practical application of flexible colorimetric strain sensors,which could promote the development of wearable and flexible strain sensors from laboratory research to consumer markets.

关键词： Mechanoluminescent Strain sensor Flexible Deep learning Wireless

省级区域获取中央财政转移支付的影响因素研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

云南财经大学学报 2016年第6期32卷 33-42页

作者：董艳梅云南财经大学财政与经济学院昆明650221

从理论分析得出影响中央财政转移支付规模的因素可分为非制度性因素和制度因素,采用12个指标构建的面板模型计量结果显示,各个地方的自然条件、经济水平、公共服务支出需求是影响中央转移支付大小的关键因素,但与中央转移支付同方向变... 详细信息

从理论分析得出影响中央财政转移支付规模的因素可分为非制度性因素和制度因素,采用12个指标构建的面板模型计量结果显示,各个地方的自然条件、经济水平、公共服务支出需求是影响中央转移支付大小的关键因素,但与中央转移支付同方向变化的结果表明其不代表公平的性质;1994年实行的新财政体制包含着改变中央财权弱化格局的导向和制度安排,其制度的不完善性恰恰正向影响了中央转移支付的大小;另外,地方政府是否为边疆省份、少数民族多寡和区域的安全性等政治考量也是影响中央转移支付的重要因素。

关键词：转移支付地方条件非制度因素制度因素

中央转移支付对欠发达地区的财力均等化效应研究

在线全文

学校读者我要写书评

暂无评论

经济理论与经济管理 2013年第10期33卷 61-70页

作者：董艳梅云南财经大学财政与经济学院昆明650221

财力均等化是中央转移支付的最基本目标,是落后地区实现公共服务均等化的基础。本文选取了尽量能反映区域特点的13个指标,对我国的省级行政辖区做了发达地区、中等发达地区和欠发达地区的划分,把研究的视角聚焦于欠发达地区。通过变异... 详细信息

财力均等化是中央转移支付的最基本目标,是落后地区实现公共服务均等化的基础。本文选取了尽量能反映区域特点的13个指标,对我国的省级行政辖区做了发达地区、中等发达地区和欠发达地区的划分,把研究的视角聚焦于欠发达地区。通过变异系数指标对比了中央转移支付对三大区域的财力均等化效应,结论显示,欠发达地区的财力均等化不仅没有得到改善,其间的财力差距反而被不断拉大。欠发达地区受中央转移支付财力均等化效应不显著的原因可能与中央转移支付制度设计的导向不清和欠发达地区畸形依赖专项转移支付有关。

关键词：欠发达地区财力均等化转移支付

在线全文

学校读者我要写书评

暂无评论

一个阿贝尔积分根的数目的下界(英文)

浙江大学学报（理学版） 2013年第3期40卷 249-254页

作者：严冬梅吕大梅南通大学理学院数学系江苏南通226007

霍尔普夫分支是动力系统分支理论中一个重要的部分,几乎所有的问题都和非退化中心附近的极限环的数目以及扰动相关.本文研究了一个近哈密尔顿系统x=H(x,y)y(1+x)+εP(x,y),y=-H(x,y)x(1+x)+εQ(x,y),其中H(x,y)=y2/2+x2k/(2... 详细信息

霍尔普夫分支是动力系统分支理论中一个重要的部分,几乎所有的问题都和非退化中心附近的极限环的数目以及扰动相关.本文研究了一个近哈密尔顿系统x=H(x,y)y(1+x)+εP(x,y),y=-H(x,y)x(1+x)+εQ(x,y),其中H(x,y)=y2/2+x2k/(2k),k≥1.通过利用霍尔普夫极限环分支理论,得到相应的阿贝尔积分孤立零点的最大个数的下界,由此给出了最大数目极限环的下界.

关键词：阿贝尔积分下界极限环