检索结果-南通市图书馆

Engineering unique vesicle structured tin phosphides@P/N co-doped carbon anode for high-performance sodium/lithium-ion batteries

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

Rare Metals 2022年第5期41卷 1496-1503页

作者： Shui-Xin Xia yu-hua yan Hao Sun Jun-He yang Shi-You Zheng School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China

Vesicle structured Sn_(4)P_(3)@P/N co-doped carbon nanocomposites(Sn_(4)P_(3)@PNC)were facilely prepared via in situ low temperature synthesis and investigated as anodes for sodium/lithium-ion ***_(4)P_(3)@PNC exhibit... 详细信息

关键词： stability. lithium performance

Synthesis of novel redox calix[4]arene derivative with 1,3-substituted large conjugated ferrocene bridge

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第9期20卷 1039-1041页

作者： Bi Qiong Hong Fa Fu yang Hong yu Guo yan hua Wang Xian Feng Chai College of Chemistry and Materials Fufian Normal University Fuzhou 350007 China

A novel redox calix[4]arene derivative with 1,3-substituted large conjugated ferrocene bridge was designed and synthesized in high yield. Its structure was characterized by element analysis, IR, ESI-MS, NMR spectrum, etc. The primary study of cyclic voltammetry showed it possessed excellent reversible electrochemistry response property. 2009 Fa Fu yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Calixarene Ferrocene Synthesis Cyclic voltammetry

A Retrospective Study of Culture-confirmed Mycobacterial Infection among Hospitalized HIV-infected Patients in Beijing, China

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2018年第6期31卷 459-462页

作者： ZHAO Xiu Ying ZENG Zhao Ying hua Wen Hao yu yan hua GUO Cai Ping ZHAO Xiu Qin DONG Hai yan LIU Jie WAN Kang Lin Beijing Tsinghua Changgung Hospital School of Clinic Medicine Tsinghua University Department of Clinical Laboratory Beijing Friendship Hospital Capital Medical University Beijing Di'tan Hospital Capital Medical University Beijing You'an Hospital Capital Medical University National Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention State Key Laboratory for Infectious Disease Prevention and Control

A retrospective analysis was performed in two major HIV/AIDS referral hospitals in Beijing to evaluate the prevalence of Mycobacterium tuberculosis（MTB） and non-tuberculous mycobacterial（NTM） infections in HIV-infected patients. A total of 627 patients＇ data were reviewed, and 102（16.3%） patients were diagnosed with culture-confirmed mycobacterial infection, including 84 with MTB, 16 with NTM, and 2 with both MTB and NTM. The most frequent clinical complication by mycobacterial infection was pulmonary infection（48/102, 47.1%）. The overall rates of multidrug-resistant TB（MDR-TB） and extensively drug-resistant TB（XDR-TB） were 11.9% and 3.4%, respectively. This study underlines the urgent need to intensify screening for mycobacteria coinfection with HIV and to prevent the spread of drug-resistant TB among HIV-infected patients.

关键词： HIV China A Retrospective Study of Culture-confirmed Mycobacterial Infection among Hospitalized HIV-infected Patients in Beijing

The correlation between molecular structure parameters of O-ethyl N-isopropyl phosphoro(thioureido)thioates and their retention data in RP-HPLC

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1993年第1期11卷 76-80页

作者： WANG,Qin-Sun GAO,Ru-yu yanG,hua-Zheng yan,Bing-Wen National Laboratory.of Elemento-Organic Chemistry,Nankai University,Tianjin 300071 National Laboratory of Elemento‐Organic Chemistry Namkai University Tianjin 300071

A retention prediction system(RPS)of seven O-ethyl N-isopropyl phosphoro(thioureido)- thioates in reversed phase HPLC was *** system is based on the solvent selectivity triangle *** molecular structure parameters(hydrophobicity Ⅱ,substituent length L, and substituent maximum width B_5)were used to describe the quantitative structure-retention relation- *** these quantitative relationships,the retention behaviours of other eight homologs for different mobile phase composition were *** predicted values were consistent with the measured values within relative error of 10%,which means that it is possible to apply the reported method to predict retention values for qualitative purposes for different mobile phase compositions.

关键词： The correlation between molecular structure parameters of O-ethyl N-isopropyl phosphoro thioureido)thioates and their retention data in RP-HPLC data

Silk damping in scalar-induced gravitational waves: a novel probe for new physics

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： yan-Heng yu Sai Wang Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

A Study on the Public Awareness of Hierarchical Medical System in Taiwan

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Health 2019年第4期11卷 361-370页

作者： yu-hua yan Chih-Ming Kung Chen-Luan Lu Superintendent Office Tainan Municipal Hospital (Managed by Show Chwan Medical Care Corporation) Taiwan Department of Information Technology and Communication Shih Chien University Kaohsiung Campus Taiwan Medical Affairs Office Tainan Municipal Hospital (Managed by Show Chwan Medical Care Corporation) Taiwan

The purpose of hierarchical medical system is to lead in terms of improving efficiency, differentiating healthcare services and promoting labor division by changing the healthcare seeking behavior. The purpose of this research aims to discuss the public awareness of hierarchical medical system in Taiwan for the reference of health policy makers. We obtained our research data using a questionnaire survey;the total number of qualified patients was 1340. This research finds that more subjects agreed to the hierarchical medical system and medical referral system, but many people still disagreed with changes to their healthcare seeking choices due to policy promotion. Subtle changes, therefore, are observed that imply a crisis in terms of the trust in healthcare. The healthcare seeking behavior will not change if there is a difference between the medical awareness of patients and policy implementation, and the government needs to be concerned with this result when making policies.

关键词： Public Awareness Hierarchical Medical System National Health Insurance Primary Health Care

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

四维欧氏空间中的广义常斜坡曲面

东北大学学报（自然科学版） 2021年第2期42卷 300-304页

作者：于延华贾琨东北大学理学院辽宁沈阳110819

利用曲面位置向量的正交分解式研究四维欧氏空间中的一类广义常斜坡曲面(即曲面的单位位置向量和单位平均曲率向量的内积为常数的曲面).首先将曲面的位置向量分解为切部分和法部分,然后对具有法平行和法部分是平均曲率向量特性的广义常... 详细信息

利用曲面位置向量的正交分解式研究四维欧氏空间中的一类广义常斜坡曲面(即曲面的单位位置向量和单位平均曲率向量的内积为常数的曲面).首先将曲面的位置向量分解为切部分和法部分,然后对具有法平行和法部分是平均曲率向量特性的广义常斜坡曲面分别进行研究,得到了在这两类特殊情况下广义常斜坡曲面的存在性及其分类.讨论了当分解式的法部分完全位于曲面的平均曲率向量方向时,广义常斜坡曲面满足的表达式及相关性质,并证明了在这种情况下曲面可以选取曲率网作为参数,并且此时广义常斜坡面为一类特殊的曲面——陈氏面.最后给出了这些曲面的一些例子,并画出了在三维空间上的投影.

关键词：广义常斜坡曲面法平行陈氏面四维欧氏空间内积

在线全文

学校读者我要写书评

暂无评论

等仿射曲线收缩流的Harnack不等式

东北大学学报（自然科学版） 2022年第1期43卷 147-152页

作者：于延华金伶东北大学理学院辽宁沈阳110819

在仿射空间中研究了基于等仿射曲线收缩流的一族闭凸等仿射曲线的Harnack不等式.首先,根据仿射空间中等仿射曲线的几何演化性质定义一类新的闭凸等仿射曲线Harnack量,进而得到该Harnack量满足的几何演化方程.其次,利用最大值原理证明Har... 详细信息

在仿射空间中研究了基于等仿射曲线收缩流的一族闭凸等仿射曲线的Harnack不等式.首先,根据仿射空间中等仿射曲线的几何演化性质定义一类新的闭凸等仿射曲线Harnack量,进而得到该Harnack量满足的几何演化方程.其次,利用最大值原理证明Harnack量为非负,即给出闭凸等仿射曲线的Harnack不等式,并得到Harnack量中参数的相应约束条件.然后,利用新定义的Harnack量进一步研究了闭凸等仿射曲线的Hamilton’s Harnack不等式.最后基于闭凸等仿射曲线Harnack不等式和柯西-施瓦兹(Cauchy-Schwarz)不等式推导出了经典的Harnack不等式.

关键词：仿射空间等仿射曲线曲线收缩流 Harnack不等式

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

三维欧氏空间中主法线曲面的结构函数

东北大学学报（自然科学版） 2018年第2期39卷 301-304页

作者：于延华岳立冬东北大学理学院辽宁沈阳110819

在三维欧氏空间中,主法线曲面作为特殊的非可展直纹面具有良好的代数和几何性质.运用微分几何的方法研究主法线曲面的结构函数.根据三维欧氏空间中不可展直纹面的定义和标准方程,给出曲线的主法线曲面的定义和标准方程.从主法线曲面的... 详细信息

在三维欧氏空间中,主法线曲面作为特殊的非可展直纹面具有良好的代数和几何性质.运用微分几何的方法研究主法线曲面的结构函数.根据三维欧氏空间中不可展直纹面的定义和标准方程,给出曲线的主法线曲面的定义和标准方程.从主法线曲面的定义和标准方程出发,得到主法线曲面的结构函数之间满足的关系,以及曲线的主法线曲面的结构函数、准线和腰曲线三者之间的联系.讨论Mannheim曲线和一般螺线的主法线曲面,得到Mannheim曲线的主法线曲面是其侣线的副法线曲面,一般螺线的主法线曲面是正螺面.

关键词：三维欧氏空间非可展直纹面主法线曲面结构函数腰曲线