检索结果-南通市图书馆

Synthesis and Crystal Structure of an Adipate-bridged Dinuclear Cadmium(Ⅱ)Polymer with 2-Methylpyrazino[2,3-f][1,10]-phenanthroline(mpphen)Terminal Ligands

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2010年第7期29卷 1015-1020页

作者： CUI Yun-Cheng xu yao-yang HUANG Yan-Ju LIU Li-Hui LV Ming WANG Xiao-Mei WANG Jia-Jun Chemistry Department of Jilin Normal University Siping Jilin 136000 China

A metal-organic coordination polymer, [Cd（C15H10N4）（C6H8O4）]2n （1, C15H10N4： 2-methyl-pyrazino-[2,3-f][1,10]-phenanthroline （mpphen）, C6H8O4： adipate）, was synthesized via hydrothermal synthesis. The polymer was characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. X-ray diffraction shows that 1 is a cadmium polymer constructed by adipate-bridged dmuclear clusters, and each adipate connects two clusters to form a two-dimen- sional planar structure. Crystal data for 1： monoclinic, space group C2/c, a = 22.403（9）, b = 16.039（6）, c = 13.808（6） A, β= 125.262（6）°, V = 4051（3） A3, Mr = 502.79, Dc = 1.649 g/eraa, μ（MoKa） = 1.114 mm^-1, F（000） = 2016, Z = 8, the final R = 0.0509 and wR = 0.1054 for 1509 observed reflections （I 〉 2σ（I））.

关键词： 2-methyl-pyrazino[2,3-f] -phenanthroline Cd coordination polymer,hydrothermal synthesis crystal structure

Effectiveness of Glaucoma Diagnostic Parameters from Spectral Domain-Optical Coherence Tomography of Myopic Patients

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2018年第15期131卷 1819-1826页

作者： Yuan Fang Han-Qiao Zhang Rong-Hua Qiao xu-yang yao Ying-Zi Pan Mei Li Department of Ophthalmology Peking University First Hospital Beijing 100034 China Department of Ophthalmology Beijing Tsinghua Changgung Hospital Beijing 102218 China

Background： Currently, spectral-domain optical coherence tomography （SD-OCT） appears to be a new type of glaucoma diagnostic tool. Thus, this study aimed to evaluate the effectiveness of glaucoma diagnostic parameters from SD-OCT of patients with different severities of myopia. Methods： This was a cross-sectional study. A total of 248 participants （248 eyes） were enrolled, including 51 cases in the early primary open-angle glaucoma group, 79 cases in the control group （0.50 D to -0.50 D, excluding -0.50 D）, 47 cases in the low-myopic group （-0.50 to -3.00 D, excluding -3.00 D）, 43 cases in the moderate-myopic group （-3.00 to -6.00 D, excluding -6.00 D）, and 28 cases in the high-myopic group （≤-6.00 D）. All participants were examined using the Humphrey visual field test and SD-OCT. The SD-OCT parameters of the retinal nerve fiber layer （RNFL） and ganglion cell complex were analyzed statistically using the receiver operating characteristic curve and area under the curve （AUC）. Results： The AUC showed that the best parameters for the control and low-myopic groups were the inferior and inferior temporal RNFL thicknesses （AUC 〉0.94）, respectively; for the moderate- and high-myopic groups, the best parameter was the temporal low RNFL thickness （AUC, 0.926 and 0.896, respectively）. The AUC of the inferior parameters of the moderate-myopic group （0.864） was lower, ranked 15^th among all RNFL parameters. When the sensitivity was fixed at 85%, the specificity of the inferior, superior, inferior temporal, and superior temporal quadrants was higher （〉80%） in the control and low-myopic groups, while they were lower （20 60%） for the moderate- and high-myopia groups. The green color based on the OCT database was also less for the high-myopic group compared with that of other groups （P 〈 0.05）. Conclusions： Glaucoma diagnostic parameters from SD-OCT were not clinically effective for the moderate- and high-myopic groups. The specificities were low. The moderate- and high-myopic grou

关键词： Glaucoma: Myopia Nerve Fibers Open Angle Retina

Müller cells are activated in response to retinal outer nuclear layer degeneration in rats subjected to simulated weightlessness conditions

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 2116-2128页

作者： Yuxue Mu Ning Zhang Dongyu Wei Guoqing yang Lilingxuan yao Xinyue xu yang Li Junhui xue Zuoming Zhang Tao Chen Aerospace Clinical Medical Center School of Aerospace MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Aviation Medicine Xijing HospitalAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Emergency Medicine Wuhan No.1 HospitalWuhanHubei ProvinceChina Third Regiment School of Basic MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina Fourth Regiment School of Basic MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina

A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain ***,we established an animal model of weightlessness via tail suspension to examine the pathological changes and molecular mechanisms of retinal damage under *** 4 weeks of tail suspension,there were no notable alterations in retinal function and morphology,while after 8 weeks of tail suspension,significant reductions in retinal function were observed,and the outer nuclear layer was thinner,with abundant apoptotic *** investigate the mechanism underlying the degenerative changes that occurred in the outer nuclear layer of the retina,proteomics was used to analyze differentially expressed proteins in rat retinas after 8 weeks of tail *** results showed that the expression levels of fibroblast growth factor 2(also known as basic fibroblast growth factor)and glial fibrillary acidic protein,which are closely related to Müller cell activation,were significantly *** addition,Müller cell regeneration and Müller cell gliosis were observed after 4 and 8 weeks,respectively,of simulated *** findings indicate that Müller cells play an important regulatory role in retinal outer nuclear layer degeneration during weightlessness.

关键词： glial fibrous acidic protein gliosis Müller cells nerve growth factor neural differentiation neurodegeneration proteomic retinal degeneration retinal outer nuclear layer simulated weightlessness

在线全文

学校读者我要写书评

暂无评论

多点激励下高烈度区接触网系统地震响应分析

浙江大学学报（工学版） 2018年第8期52卷 1575-1582页

作者：徐军李英民杨旭尧胡晓平重庆大学土木工程学院重庆400045 中铁电气化局宝鸡器材有限公司陕西宝鸡721000

以某高烈度区电气化铁路接触网系统为研究对象,建立考虑材料非线性和几何非线性特性的三维柱-线有限元模型.采用SMIQKE-II软件合成与规范反应谱相吻合的空间相关地震动时程,基于相对位移法进行接触网系统在一致激励、相干激励、行波激... 详细信息

以某高烈度区电气化铁路接触网系统为研究对象,建立考虑材料非线性和几何非线性特性的三维柱-线有限元模型.采用SMIQKE-II软件合成与规范反应谱相吻合的空间相关地震动时程,基于相对位移法进行接触网系统在一致激励、相干激励、行波激励和多点激励下的非线性时程分析,对比研究系统关键部件在不同地震激励模式下的响应规律.结果表明,多点激励明显放大接触网系统的地震响应,对接触线横向位移响应的放大最为显著,对支柱底部应力的放大相对较小;接触网系统地震响应的放大程度主要取决于激励方式与视波速的大小;为了得到接触网系统各关键部件的最不利地震响应,应该综合考虑多点激励的影响和场地条件,以选择合适的视波速进行抗震分析.

关键词：接触网多点激励地震响应高烈度区行波效应电气化铁路

Prognostic role of diabetes mellitus in hepatocellular carcinoma patients after curative treatments:a meta-analysis

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2011年第4期10卷 346-355页

作者： Wei-Min Wang,yang xu,Xin-Rong yang,yao-Hui Wang,Hai-Xiang Sun and Jia Fan Institute of Biomedical Sciences,Fudan University,Shanghai 200032,China Key Laboratory of Carcinogenesis and Cancer Invasion,Ministry of Education,and Liver Cancer Institute,Zhongshan Hospital,Fudan University,Shanghai 200032,China Fudan University Shanghai Cancer Center,Shanghai 200032,China Institute of Biomedical Sciences Fudan University Shanghai 200032 China Key Laboratory of Carcinogenesis and Cancer Invasion Ministry of Education and Liver Cancer Institute Zhongshan Hospital Fudan University Shanghai 200032 China Fudan University Shanghai Cancer Center Shanghai 200032 China

BACKGROUND:The prognostic role of diabetes mellitus (DM) coexisting with hepatocellular carcinoma (HCC) remains *** clarify its impact on survival in HCC patients after curative treatments,a meta-analysis was *** SOURCES:Eligible studies were identified through multiple search strategies in the databases PubMed (MEDLINE),EMBASE,the Cochrane Library and ACP Journal Club between January 1950 and March *** studies fulfilled the inclusion criteria,and data were aggregated comparing overall survival and recurrence-free survival in HCC patients according to DM ***:The pooled hazard ratios (HRs) estimate for overall survival was 1.34 (95% CI,1.18-1.51;P<0.0001) and for recurrence-free survival was 1.48 (95% CI,1.00-2.18;P<0.0001),showing a worse survival for HCC with coexisting ***,the patients with DM had a shorter survival time in HCV-related HCC (HR=1.71;95% CI,1.10-2.66;P=0.016),while HBV-related cases were not significantly different (HR=1.29;95% CI,0.69-2.40;P=0.182).Meanwhile,the coexistence of DM impaired overall survival in HCC patients with a small tumor burden (HR=1.63;95% CI,1.25-2.12;P<0.0001).CONCLUSION:HCC patients with coexisting DM have a shorter survival time and a higher risk for tumor recurrence after curative treatments,while the precise value should be defined in more clinical trials with consistent methodology,especially prospective studies.

关键词： hepatocellular carcinoma diabetes mellitus prognostic factors survival meta-analysis

Unveiling the superior hydrogen evolution reaction activity of 1T-2H MoS_(2)heterointerface by on-chip microdevices

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 149-156页

作者： Bowen Liu Junjie Xiong Shuaishuai xu Xinying Luo Wenyan yao Shigang Liu Yuting Du Qinghua Zhang yang Gao Bin Wang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology(NCNST)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The identification and clarification of active sites of MoS_(2)have long been the focus of research efforts in hydrogen evolution reaction(HER).In this study,we constructed phase transition-induced 1T-2H MoS_(2)heterojunction via lithium intercalation and evaluated the HER activity using on-chip electrocatalytic microdevices(OCEMs).The heterojunction achieved an overpotential of only 226 mV at a cathodic current density of 10 mA/cm^(2),outperforming the basal planes of 1T and 2H MoS_(2).Furthermore,density functional theory(DFT)calculations demonstrated that the charge redistribution occurs at the 1T-2H MoS_(2)interface with electrons transferring from 1T to 2H MoS_(2),and the interfacial S atom at the top site of 1T MoS_(2)presents the smallest overpotential of 0.37 ***,the interference from highly active edge sites was avoided by precisely exposing specific active areas,quantitatively revealing the catalytic activity order of different types of in-plane MoS_(2)active *** work enables a systematic investigation of the HER activity of various active sites in MoS_(2),laying the foundation for quantitative analysis of activity in other lowdimensional materials.

关键词： on-chip microdevice phase transition heterojunction MoS_(2) hydrogen evolution reaction(HER)

新型高温合金718Plus的性能特点、航空应用和发展趋势

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

材料导报 2017年第19期31卷 72-79页

作者：王妙全田成刚南洋徐瑶杨国宝童锦艳中国航发商用航空发动机有限责任公司上海201108

718Plus合金凭借其优异的力学性能、较高的耐温能力、良好的加工性和适宜的制造成本,有效填补了IN718和Waspaloy合金之间长期以来存在的合金空白,逐渐应用于高性能航空发动机零部件制造。详细阐述了新型高温合金718Plus的性能特点,包括... 详细信息

718Plus合金凭借其优异的力学性能、较高的耐温能力、良好的加工性和适宜的制造成本,有效填补了IN718和Waspaloy合金之间长期以来存在的合金空白,逐渐应用于高性能航空发动机零部件制造。详细阐述了新型高温合金718Plus的性能特点,包括化学成分、析出相、热处理制度和力学性能等。此外,还总结了718Plus合金的制造成本和航空应用情况。

关键词： 718Plus合金 γ′相力学性能制造成本航空应用

基于自适应鲁棒反演的固体动能拦截器姿态跟踪控制

在线全文

学校读者我要写书评

暂无评论

固体火箭技术 2016年第5期39卷 715-722页

作者：杨旭姚晓先张皎刘源翔北京理工大学宇航学院北京100081

针对固体动能拦截器姿控发动机推力恒定、分散式布局控制力矩的强耦合特性及系统模型存在不确定特点的拦截器姿态稳定跟踪控制问题,提出了一种基于自适应鲁棒反演的新型姿态控制器设计方法。充分考虑姿态控制系统中三通道及姿控推力间... 详细信息

针对固体动能拦截器姿控发动机推力恒定、分散式布局控制力矩的强耦合特性及系统模型存在不确定特点的拦截器姿态稳定跟踪控制问题,提出了一种基于自适应鲁棒反演的新型姿态控制器设计方法。充分考虑姿态控制系统中三通道及姿控推力间的相互耦合关系,建立了姿态控制耦合模型,利用反演及滑模方法设计了实际与虚拟控制量。通过自适应方法对系统内各通道间的耦合及不确定项进行估计及补偿,提高了姿态控制的精度。基于PWPF调制方法,将设计的连续控制量解算成可直接用于姿态控制的脉冲控制量,实现了拦截器的数字变推力控制。仿真结果表明,所设计的姿态控制算法在参数摄动及存在不确定干扰的情况下,仍满足姿态稳定跟踪要求。

关键词：动能拦截器变推力控制 PWPF调制器不确定性

Clinicopathological differences between patients with schistosomal appendicitis and non schistosomal appendicitis:A retrospectively study of past ten years

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第2期13卷 24-32页

作者： Xiao-Yi Wang yao Hao Zi-Jian Wang Xiu-Liang xu Jiang-Hua yang Department of Infectious Diseases The First Affiliated of Wannan Medical CollegeWuhu 241001Anhui ProvinceChina

BACKGROUND Chronic schistosomiasis causes multiple organ and multiple system diseases,especially the digestive *** eggs are mainly deposited in the stomach,liver and colorectal,but a few eggs are deposited in the appendix and cause *** present,there are few studies on schistosomal *** To explore the differences in epidemiological,clinical and pathological characteristics between schistosomal appendicitis and non-schistosomal appendicitis over the past decade in order to assess the impact of schistosomiasis on *** The differences of general data,clinical data and laboratory examination data of patients with appendicitis from October 2013 to October 2023 were retrospectively *** patients were divided into two groups for *** were 136 patients in schistosomal appendicitis group and 5418 patients in non-schistosomal appendicitis *** Schistosomal appendicitis accounted for 2.45%of all patients with appendicitis,and the annual proportion in the past decade was 2.2%,2.9%,1.8%,1.9%,3.4%,3.1%,1.9%,1.6%,3%,2.6%,*** prevalence of schistosomal appendicitis was middle-aged and elderly males,with an average age of 61.73±15.335 *** main population of non-schistosomal appendicitis was middle-aged men,with an average age of 35.8±24.013 years(P<0.001).The distribution of pathological types of appendicitis was different between the two groups(P<0.001).The incidence of acute suppurative appendicitis in non-schistosomal appendicitis was higher than that in schistosomal appendicitis[odds ratio(OR)=0.504;95%confidence interval(CI):0.349-0.728;P<0.001].The proportion of acute attack of chronic appendicitis in schistosomal appendicitis was higher than that in non-schistosomal appendicitis(OR=2.614;95%CI:1.815-3.763;P<0.001).The proportion of schistosomal appendicitis patients complicated with colorectal cancer was higher than that of nonschistosomal appendicitis patients(OR=5.087;95%CI:1.427-

关键词： Schistosomal appendicitis Schistosomiasis Appendix Colorectal cancer Clinicopathological characteristics