检索结果-南通市图书馆

实时三维超声心动图评估三尖瓣下移畸形解剖矫治术后右室重构的临床价值

在线全文

学校读者我要写书评

暂无评论

临床超声医学杂志 2024年第6期26卷 454-459页

作者：刘倩倩葛滨李静惠万琳媛王婧金孟红中国医学科学院阜外医院超声影像中心北京市100037 中国医学科学院阜外医院磁共振影像科北京市100037

目的探讨实时三维超声心动图(RT-3DE)评估三尖瓣下移畸形(EA)解剖矫治术后右室重构的临床应用价值。方法选取在我院行外科解剖矫治术的22例EA患者,根据Carpentier分型分为A-B型组(10例)、C型组(6例)和D型组(6例),比较各组术前和术后6个... 详细信息

目的探讨实时三维超声心动图(RT-3DE)评估三尖瓣下移畸形(EA)解剖矫治术后右室重构的临床应用价值。方法选取在我院行外科解剖矫治术的22例EA患者,根据Carpentier分型分为A-B型组(10例)、C型组(6例)和D型组(6例),比较各组术前和术后6个月RT-3DE及心脏磁共振(CMR)检查结果的差异。采用Pearson相关分析法分析RT-3DE与CMR所测右室舒张末容积指数(RVEDVi)及右室射血分数(RVEF)的相关性。结果RT-3DE检查显示,各组术前左室射血分数、RVEF及术后6个月RVEF比较差异均有统计学意义(均P<0.05);22例EA患者术后6个月三尖瓣反流程度较术前减轻,RVEF和RVEDVi均减小,差异均有统计学意义(均P<0.05)。CMR检查显示,22例EA患者术后6个月RVEDVi较术前减小,差异有统计学意义(P<0.05)。相关性分析显示,术前RT-3DE与CMR所测RVEDVi呈高度正相关(r=0.908,P=0.012),两种方法所测术后RVEDVi无相关性(r=0.522,P=0.184);RT-3DE与CMR所测术前和术后RVEF分别呈高度、中度正相关(r=0.818、0.564,均P<0.05)。结论RT-3DE可准确评估EA患者右室容积和功能,在术后右室重构评估中具有重要的临床应用价值。

关键词：超声心动描记术,三维,实时三尖瓣下移畸形心脏磁共振右室重构

The component-activity interrelationship of cobalt-based bifunctional electrocatalysts for overall water splitting:Strategies and performance

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 453-474页

作者： Mingjie Sun Riyue ge Sean Li Liming Dai Yiran Li bin Liu Wenxian Li School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong Kong SAR 999077China School of Materials Science and Engineering University of New South WalesSydneyNew South Wales 2052Australia UNSW Materials&Manufacturing Futures Institute UNSW SydneyNew South Wales 2052Australia School of Chemical Engineering University of New South WalesSydneyNew South Wales 2052Australia

Cobalt-based electrocatalysts take advantage of potentially harmonizable microstructure and flexible coupling effects compared to commercial noble metal-based catalytic ***,conventional water electrolysis systems based on cobalt-based monofunctional hydrogen evolution reaction(HER)or oxygen evolution reaction(OER)catalysts have certain shortcomings in terms of resource utilization and *** contrast,cobalt-based bifunctional catalysts(CBCs)have attracted much attention in recent years for overall water splitting systems because of their practicality and reduced preparation cost of *** review aims to address the latest development in CBCs for total *** main modification strategies of CBCs are systematically classified in water electrolysis to provide an overview of how to regulate their morphology and electronic ***,the catalytic performance of CBCs in total-hydrolysis is summarized according to the types of cobalt-based phosphides,sulfides and oxides,and the mechanism of strengthened electrocatalytic ability is emphasized through combining experiments and theoretical *** efforts are finally suggested to focus on exploring the dynamic conversion of reaction intermediates and building near-industrial CBCs,designing advanced CBC materials through micro-modulation,and addressing commercial applications.

关键词： Cobalt Bifunctional electrocatalysis Water splitting Modification strategies Electrocatalytic performances

在线全文

学校读者我要写书评

暂无评论

气-液两相流喷嘴内部流场仿真及参数优化

金川科技 2024年第1期 1-7,14页

作者：张朋史铭闫泽鹏李明瑞王瑛葛正斌金川集团矿山工程分公司北京科技大学土木工与资源工程学院

为提高矿山井下防尘技术,优化喷雾雾化效果及除尘能力,本文依据实际参数建立了喷嘴的物理模型进行了数值模拟。结果表明:气体进入混合腔后会形成回旋气流从而与液体发生碰撞,产生一次破碎雾化效果,而喷嘴的喷出口较小导致喷雾口流速极... 详细信息

为提高矿山井下防尘技术,优化喷雾雾化效果及除尘能力,本文依据实际参数建立了喷嘴的物理模型进行了数值模拟。结果表明:气体进入混合腔后会形成回旋气流从而与液体发生碰撞,产生一次破碎雾化效果,而喷嘴的喷出口较小导致喷雾口流速极大形成对水雾的二次破碎效果,有助于降低喷雾粒度;气压增大,喷嘴中部的速度场逐渐呈现出涡旋的状态,有助于提高雾化效果;水压增大,大部分的水由出水口进入混合腔后直接由喷嘴出口喷出,对喷嘴的雾化效果起到消极作用。

关键词：喷雾雾化效果数值模拟

火电机组热力系统与设备损分布通用矩阵模型

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

东南大学学报（自然科学版） 2009年第5期39卷 1043-1048页

作者：葛斌张俊礼殷戈东南大学能源与环境学院南京210096

为了揭示系统部件损分布进而探讨机组节能潜力,在深入分析各部件流特性的基础上,提出了火电机组热力系统与设备损分布的通用矩阵模型.将整个热力系统分为5个控制体,针对每一控制体建立质量平衡与平衡方程,再按各控制体流方向... 详细信息

为了揭示系统部件损分布进而探讨机组节能潜力,在深入分析各部件流特性的基础上,提出了火电机组热力系统与设备损分布的通用矩阵模型.将整个热力系统分为5个控制体,针对每一控制体建立质量平衡与平衡方程,再按各控制体流方向依序相连各控制体级模型构成机组矩阵模型.与已有的回热系统损分布矩阵相比,新建模型可量化评价系统中每一过程(或设备)的热力性能,并全面反映系统及各辅助系统的影响.实例结果表明,热力系统中不可逆性主要来源于锅炉,其损率达50.28%.所建模型准确便捷,适用于各类火电机组;损分布规律清晰,有利于挖掘各设备(或过程)的节能潜力;可为火电机组优化设计及经济运行提供有效工具.

关键词：火电机组热力系统与设备 损分布通用矩阵模型

基于geO数据库生物信息学筛选动脉粥样硬化铁死亡关键基因和实验验证

在线全文

学校读者我要写书评

暂无评论

现代检验医学杂志 2024年第5期39卷 112-119页

作者：魏星陈芊颖龚厚文许锋成韩立明葛斌龚大彩成都医学院第三附属医院/成都市郫都区人民医院检验科成都611730 成都医学院第三附属医院/成都市郫都区人民医院心内科成都611730 成都医学院第三附属医院/成都市郫都区人民医院超声科成都611730 成都医学院检验学院成都610500

目的利用生物信息学方法,筛选动脉粥样硬化(atherosclerosis,AS)铁死亡关键基因,并分析关键基因的生物学功能,以便深入了解AS发病机制。方法从geO(gene expression omnibus)数据库下载AS基因表达谱芯片数据集GSE100927,以P1|为条件筛选A... 详细信息

目的利用生物信息学方法,筛选动脉粥样硬化(atherosclerosis,AS)铁死亡关键基因,并分析关键基因的生物学功能,以便深入了解AS发病机制。方法从geO(gene expression omnibus)数据库下载AS基因表达谱芯片数据集GSE100927,以P1|为条件筛选AS的差异基因,并与铁死亡数据集Ferroptosis基因取交集,筛选出AS铁死亡相关基因,并进行基因本体(GO)功能注释和京都基因与基因组百科全书(KEGG)富集分析,随后通过STRING在线分析工具联合Cytoscape可视化软件挖掘在AS生物学过程中发挥关键作用的基因,并采用AS数据集GSE9874作为验证集,验证关键基因的表达,最后,收集2023年1~3月所在医院心血管内科30例AS确诊患者血液样本作为实验组,同时收集20例健康志愿者血液样本作为对照组,提取样本RNA,采用实时荧光定量PCR(quantitativereal time polymerase chain reaction,qRT-PCR)方法对筛选基因验证。结果采用生物信息学方法共筛选出10个AS铁死亡相关差异基因。GO功能富集分析结果表明,差异基因主要涉及炎症、细胞凋亡、氧化应激等生物学过程,KEGG通路富集分析表明差异基因主要涉及铁死亡、HIF-1信号通路、白细胞经内皮细胞迁移通路等。蛋白互作网络筛选出7个基因构建的关键模块,分别是FTL,SLC40A1,CYBB,NCF2,HMOX1,DPP4和ALOX5,采用GSE9874进行验证,最终筛选出ALOX5,DPP4,FTL,SLC40A1,NCF2等5个关键基因;qRT-PCR对临床样本中关键基因表达检测显示,相对于对照组,AS组血液中表达上调的基因有DPP4(t=1.795,P=0.046),FTL(t=2.218,P=0.029),SLC40A1(t=2.859,P=0.009);表达下调的基因有ALOX5(t=8.039,P<0.001),NCF2(t=11.867,P<0.001),差异具有统计学意义;实验结果与生物信息学分析结果一致。亚组分析发现斑块组DPP4表达高于内膜增厚组,差异具有统计学意义(t=2.843,P=0.036)。结论通过生物信息学筛选出AS铁死亡关键基因ALOX5,DPP4,FTL,SLC40A1和NCF2,可能成为AS诊断治疗的潜在靶点,为AS的临床诊疗提供新的思路。

关键词：生物信息学铁死亡动脉粥样硬化差异表达基因实时荧光定量PCR

Surface Deposition of Ni（OH）2 and Lattice Distortion Induce the Electrochromic Performance Decay of NiO Films in Alkaline Electrolyte

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第3期7卷 261-271页

作者： Kejun Xu Liuying Wang Chaoqun ge Long Wang bin Wang Zhuo Wang Chuanwei Zhang Gu Liu Xi'an Research Institute of High Technology School of Material Science and Engineering Zhengzhou University School of Mechanical Engineering Xi'an University of Science and Technology

NiO,an anodic electrochromic material,has applications in energy-saving windows,intelligent displays,and military ***,its electrochromic mechanism and reasons for its performance degradation in alkaline aqueous electrolytes are complex and poorly understood,making it challenging to improve NiO thin *** studied the phases and electrochemical characteristics of NiO films in different states （initial,colored,bleached and after 8000 cycles） and identified three main reasons for performance ***,Ni（OH）2is generated during electrochromic cycling and deposited on the NiO film surface,gradually yielding a NiO@Ni（OH）2core-shell structure,isolating the internal NiO film from the electrolyte,and preventing ion ***,the core-shell structure causes the mode of electrical conduction to change from first-to second-rder conduction,reducing the efficiency of ion transfer to the surface Ni（OH）***,Ni（OH）2and NiOOH,which have similar crystal structures but different b-axis lattice parameters,are formed during electrochromic cycling,and large volume changes in the unit cell reduce the structural stability of the thin ***,we clarified the mechanism of electrochromic performance degradation of NiO films in alkaline aqueous electrolytes and provide a route to activation of NiO films,which will promote the development of electrochromic technology.

关键词： alkaline electrolyte electrochromism NiO film performance attenuation mechanism

回转窑冷却机支承装置中滚动轴承的设计和探讨

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

轻金属 2008年第6期 22-27页

作者：葛斌中国铝业河南分公司氧化铝一厂河南郑州450041

论述了滚动轴承在回转窑冷却机支承装置中的设计计算方法,在计算Fr时,对一般设计中的计算方法进行了修正和改进,省略了筒体斜度、托轮及轴自重的影响,引入偏心负荷系数、现场受力系数的概念,使计算更为简明合理;结合笔者的设计实践,举... 详细信息

论述了滚动轴承在回转窑冷却机支承装置中的设计计算方法,在计算Fr时,对一般设计中的计算方法进行了修正和改进,省略了筒体斜度、托轮及轴自重的影响,引入偏心负荷系数、现场受力系数的概念,使计算更为简明合理;结合笔者的设计实践,举例印证了设计计算的方法。

关键词：滚动轴承摩擦系数径向荷载轴向荷载

Engineering and understanding SnS_(0.5)Se_(0.5)@N/S/Se triple-doped carbon nanofibers for enhanced sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 226-230页

作者： Fanjun Kong Yixin ge Shi Tao Zhengqiu Yuan Chen Lu Zhida Han Lianghao Yu bin Qian School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Far East Holding Group Co. Ltd.Yixing 214200China

Tin-based chalcogenides have attracted tremendous attention as an anode material for sodium storage owing to their unique structure and high theoretical capacity. Unfortunately, the large volume change and poor conductivity lead to sluggish reaction kinetics and poor cycling performance. Herein, SnS_(0.5)Se_(0.5)nanoparticles coupled with N/S/Se triple-doped carbon nanofibers(SnS_(0.5)Se_(0.5)@NSSe-C) are designed and synthesized through electrospinning and annealing process. Benefiting from the synergistic effects of SnS_(0.5)Se_(0.5)and NSSe-C, the SnS_(0.5)Se_(0.5)@NSSe-C nanofibers exhibit a high reversible capacity and ultralong cycle life at higher current density for sodium-ion batteries. Furthermore, the sodium storage mechanism and electrochemical reaction kinetics of the SnS_(0.5)Se_(0.5)@NSSe-C composite are characterized by the in-situ measurements. The theoretical calculations further reveal the structural advantages of SnS_(0.5)Se_(0.5)@NSSeC composite, which exhibits a high adsorption energy of Na+. This work can provide a novel idea for the synthesis of ternary tin-based chalcogenides and is beneficial for the investigation of their reaction kinetics.

关键词： SnS_(0.5)Se_(0.5) Carbon nanofibers Doping Density functional theory Sodium ion batteries

High-entropy catalysts for electrochemical water-electrolysis of hydrogen evolution and oxygen evolution reactions

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2024年第3期18卷 265-290页

作者： Simiao SHA Riyue ge Ying LI Julie M.CAIRNEY Rongkun ZHENG Sean LI bin LIU Jiujun ZHANG Wenxian LI School of Materials Science and Engineering Shanghai UniversityShanghai 200444China School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu 241000China Australian Centre for Microscopy and Microanalysis School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney NSW 2006Australia School of Physics The University of SydneySydney NSW 2006Australia School of Materials Science and Engineering UNSW Materials&Manufacturing Futures InstituteUniversity of New South WalesSydney NSW 2052Australia College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China

High entropy materials (HEMs) have developed rapidly in the field of electrocatalytic water-electrolysis for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) due to their unique properties. In particular, HEM catalysts are composed of many elements. Therefore, they have rich active sites and enhanced entropy stability relative to single atoms. In this paper, the preparation strategies and applications of HEM catalysts in electrochemical water-electrolysis are reviewed to explore the stabilization of HEMs and their catalytic mechanisms as well as their application in support green hydrogen production. First, the concept and four characteristics of HEMs are introduced based on entropy and composition. Then, synthetic strategies of HEM catalysts are systematically reviewed in terms of the categories of bottom-up and top-down. The application of HEMs as catalysts for electrochemical water-electrolysis in recent years is emphatically discussed, and the mechanisms of improving the performance of electrocatalysis is expounded by combining theoretical calculation technology and ex-situ/in situ characterization experiments. Finally, the application prospect of HEMs is proposed to conquer the challenges in HEM catalyst fabrications and applications.

关键词： high-entropy electrocatalysis synthetic methods water-electrolysis hydrogen and oxygen evolutions