检索结果-南通市图书馆

Modulating of MoSe_(2)functional plane via doping-defect engineering strategy for the development of conductive and electrocatalytic mediators in Li-S batteries

在线全文

学校读者我要写书评

暂无评论

Journal of energy Chemistry 2022年第12期75卷 512-523,I0013页

作者： Mohammed A.Al-Tahan Yutao Dong Aml e.Shrshr Xiyang Kang Hui Guan Yumiao Han Zihao Cheng Weihua Chen Jianmin Zhang College of Chemistry Zhengzhou UniversityZhengzhou 450001HenanChina College of Science Henan Agricultural UniversityZhengzhou 450002HenanChina Chemistry Department Faculty of ScienceAl-Azhar UniversityAssiut 71524Egypt

The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)*** functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has been designed and applied in Li-S batteries to develop the functional separator and multi-layer sulfur *** cell with a functional separator exhibits a retention capacity of 462 m ah g^(-1)after the 1000th at 0.5 C and 516 m ah g^(-1)after the 600th at 0.3 *** at low electrolyte conditions(7.0μL_(mgsulfur)^(-1)and 15μL_(mgsulfur)^(-1))under high sulfur loadings(3.46 mg cm^(-2)and 3.73 mg cm^(-2)),the cell still presents high reversible discharge capacities 679 and 762 m ah g^(-1)after 70 cycles,***,at sulfur loadings up to 8.26 and 5.2 mg cm^(-2),the cells assembled with the bi-layers sulfur cathode and the tri-layers sulfur cathode give reversible capacities of 3.3 m ah cm^(-2)after the 100th cycle and 3.0 m ah cm^(-2)after the 120th cycle,*** research not only demonstrates that the FeMoSe_(2)@r GO functional plane is successfully designed and applied in Li-S batteries with superior electrochemical performances but also paves the novel way for developing a unique multi-layer cathode technique to enhance and advance the electrochemical behavior of Li-S cells at a high-sulfur-loading cathode under lean electrolyte/sulfur(e/S)ratio.

关键词： Lithium-sulfur batteries Modified separator Fe-MoSe_(2)@rGO Multi-layers cathode Defect engineering

在线全文

学校读者我要写书评

暂无评论

女性睡眠困难、睡眠时间与高血压风险

中华高血压杂志 2023年第10期31卷 996-996页

作者： Haghayegh S Strohmaier S Hamaya R eliassen ah Willet WC Rimm eB Schernhammer e 赵狄(摘译) 郑武洪(审校) 不详

睡眠不足与高血压的发病率正在全球范围引起警觉。本研究探讨女性睡眠困难、睡眠时间与高血压风险的关系。方法:对护士健康研究2(Nurses’ Health Study 2,NHS2)的66 122例参加者前瞻性随访16年,每2年评估一次高血压发病率。所有参加者... 详细信息

睡眠不足与高血压的发病率正在全球范围引起警觉。本研究探讨女性睡眠困难、睡眠时间与高血压风险的关系。方法:对护士健康研究2(Nurses’ Health Study 2,NHS2)的66 122例参加者前瞻性随访16年,每2年评估一次高血压发病率。所有参加者基线时(2001年)无高血压。采用Cox比例风险模型评估与睡眠困难、睡眠时间相关的高血压发生风险比(hazard ratios,HRs)和95%CI。结果:随访期间发生高血压25 987例。

关键词： Cox比例风险模型高血压发病率睡眠时间睡眠不足睡眠困难护士健康全球范围

Long-term spaceflight and the cardiovascular system

在线全文

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2020年第4期3卷 284-291页

作者： Nicholas A.Vernice Cem Meydan ebrahim Afshinnekoo Christopher e.Mason The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine Weill Cornell Medicine1305 York AvenueNew YorkNY 10021USA Department of Physiology and Biophysics Weill Cornell Medicine1300 York AvenueNew YorkNY 10021USA The WordQuant Initiative for Quantitative Prediction Weill Cornell Medicine1300 York AvenueNew YorkNY 10021USA The Feil Family Brain and Mind Research Institute Weill Cornell Medicine1300 York Avenue New YorkNY 10021USA

While early investigations into the physiological effects of spaceflight suggest the body’s ability to reversibly adapt,the corresponding effects of long-term spaceflight(>6months)aremuch less *** exposure to microgravity and radiation yields profound effects on the cardiovascular system,including a massive cephalad fluid translocation and altered arterial pressure,which attenuate blood pressure regulatory mechanisms and increase cardiac ***,central venous pressure decreases as a result of the loss of venous *** stimulation of baroreceptors by the cephalad shift results in an approximately 10%–15%reduction in plasma volume,with fluid translocating from the vascular lumen to the *** possible increases in cardiac workload,myocyte atrophy and notable,yet unexplained,alterations in hematocrit have been *** is postulated to result from shunting of protein synthesis from the endoplasmic reticulum to the mitochondria via mortalin-mediated *** data are scarce regarding their causative agents,arrhythmias have been frequently reported,albeit sublethal,during both Russian and American expeditions,with QT interval prolongation observed in long,but not short duration,*** of the heart to the proton and heavy ion radiation of deep space has also been shown to result in coronary artery degeneration,aortic stiffness,carotid intima thickening via collagen-mediated action,accelerated atherosclerosis,and induction of a pro-inflammatory *** return,long-term spaceflight frequently results in orthostatic intolerance and altered sympathetic responses,which can prove hazardous should any rapidmobilization or evacuation be required,and indicates that these cardiac risks should be especially monitored for future missions.

关键词： microgravity cardiovascular system spaceflight aerospace medicine

利用偏最小二乘回归方法(PLS)解析、优化钢铁生产流程的各限制性环节

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

南方金属 2011年第6期 17-22页

作者：顾云松阿中马鞍山钢铁股份有限公司安徽马鞍山243000

介绍了分析复杂系统规律的第二代多元统计分析方法——偏最小二乘回归(PLS)的原理和技术特点,利用国内第一款在excel中实现PLS的软件——PeW(PLS+excel+Word)对钢铁流程之一的烧结工序限制性环节——影响烧结矿低温还原粉化指数RDI的因... 详细信息

介绍了分析复杂系统规律的第二代多元统计分析方法——偏最小二乘回归(PLS)的原理和技术特点,利用国内第一款在excel中实现PLS的软件——PeW(PLS+excel+Word)对钢铁流程之一的烧结工序限制性环节——影响烧结矿低温还原粉化指数RDI的因素进行了分析.此技术提供了一种模型简单有效,物理意义清晰明确的分析工具,可以打开错综复杂,影响因素交叉重叠这一看不见的钢铁生产各流程黑箱,指导操作调整,指引改造升级,为解析、优化钢铁生产流程的各限制性环节提供了一个很好的手段.

关键词：偏最小二乘回归方法(PLS) 解析优化钢铁流程限制性环节

在线全文

学校读者我要写书评

暂无评论

纺织品在生物机电材料封闭关节中的应用

国际纺织导报 2005年第3期33卷 81-83页

作者： W.Scheibner M.Feustel U.Mhring L.Zentner C.Schilling H.witte 翁鸣图林根纺织研究所伊尔梅瑙技术大学

概述了纺织品在生物机电工程材料封闭关节中的应用,这是德国伊尔梅瑙技术大学和图林根纺织研究所的共同研究项目。将来的研发工作将集中在编织技术上,因为它可以产生微型结构而不必使用小型工具。

关键词：纺织品材料封闭关节生物机电工程工程材料应用关节封闭机电生物编织技术

Surface N Balances in Agricultural Crop Production Systems in China for the Period 1980-2015

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2008年第3期18卷 304-315页

作者： SUN Bo SHeN Run-Ping A. F. BOUWMAN Institate of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Nanjing University of Information Science and Technology Nanjing 210044 （China） National Institute for Public Health and the environment P. O. Box 303 3720 AH Bilthoven （The Netherlands）

Surface nitrogen （N） balances for China＇s crop production systems was estimated using statistical data collected from 1980 to 2004 at the national and provincial scale and from 1994 to 1999 at the county level. There was a surplus N balance throughout these periods, but the surplus was nearly stable in recent years. Projections using nonseasonal Box-Jenkins model or exponential models show that the N surplus for the total cultivated land in China was likely to increase from 142.8 kg ha^-1 in 2004 to 168.6 kg ha 1 in 2015. The N balance surplus in the more developed southeastern provinces was the largest, and was slightly less in the central region, which caused the nitrate pollution in the ground water. The N surplus was much less in the western and northern provinces because of lower synthetic fertilizer inputs. The region with high N risk includes Beijing Municipality and Jiangsu, Zhejiang, Fujian, Guangdong, Hubei, and Shandong provinces for 2002-2004. The projections suggested that 15 provinces （or municipalities） in the middle and southeastern part of China except Jiangxi and Shanxi provinces would become the high-risk region by 2015. The level of economic development, transportation, and labor force condition had an important effect on the N balance surplus at the county level, but the last two factors showed remarkable impact at the provincial level. To decrease the nonpoint pollution （Npp） risk from crop production, the authors suggested to reduce the target level for national grain self-sufficiency to 90%-95% and change the regional structure of grain production by moving some of the future grain production from the high Npp risk areas of eastern China to parts of the central and western provinces where the Npp risk was much less.

关键词： agriculture China driving force nonpoint pollution risk surface nitrogen balance

Numerical Simulation of the Tip Aerodynamics and Acoustics Test

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2016年第2期25卷 153-160页

作者： F Tejero e P Doerffer O Szulc J L Cross The Szwalski Institute of Fluid-Flow Machinery Polish Academy of Sciences. Fiszera 14 80-231 Gdansk Poland NASA Ames Research Center (retired) Moffett Field CA USA

The application of an efficient flow control system on helicopter rotor blades may lead to improved aerodynamic performance. Recently, our invention of Rod Vortex Generators(RVGs) has been analyzed for helicopter rotor blades in hover with success. As a step forward, the study has been extended to forward flight conditions. For this reason, a validation of the numerical modelling for a reference helicopter rotor(without flow control) is needed. The article presents a study of the flow-field of the ah-1G helicopter rotor in low-, medium- and high-speed forward flight. The CFD code FLOWer from DLR has proven to be a suitable tool for the aerodynamic analysis of the two-bladed rotor without any artificial wake modelling. It solves the URANS equations with LeA(Linear explicit Algebraic stress) k-ω model using the chimera overlapping grids technique. Validation of the numerical model uses comparison with the detailed flight test data gathered by Cross J. L. and Watts M. e. during the Tip Aerodynamics and Acoustics Test(TAAT) conducted at NASA in 1981. Satisfactory agreements for all speed regimes and a presence of significant flow separation in high-speed forward flight suggest a possible benefit from the future implementation of RVGs. The numerical results based on the URANS approach are presented not only for a popular, low-speed case commonly used in rotorcraft community for CFD codes validation but preferably for medium- and high-speed test conditions that have not been published to date.

关键词： ah-1G TAAT helicopter rotor forward flight chimera overlapping grid

Patterns of dairy manure management in China

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological engineering 2017年第3期10卷 227-236页

作者： Li Chenyan Qiao Wei Roland W.Melse Li Lujun Fridtjof e.de Buisonjé Wang Yajing Dong Renjie Biomass engineering Center College of EngineeringChina Agricultural UniversityBeijing 100083China Wageningen University&Research centre Wageningen Livestock ResearchWageningen 6700AHthe Netherlands College of Water Resources&Civil engineering China Agricultural UniversityBeijing 100083China State Key Laboratory of Animal Nutrition Beijing Engineering Technology Research Center of Raw Milk Quality and Safety ControlCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China College of Animal Science and Technology China Agricultural UniversityBeijing 100193China

The dairy industry in China is rapidly developing,particularly in terms of the upscaling of dairy ***,nutrient-rich manure brings challenges to the sustainability of the dairy *** study investigated and reviewed the patterns of dairy manure management in China,and the results indicate that dairy manure could be used as an organic fertilizer because of its high organic nutrient content and low metal ***,legislation prohibits the application of untreated(raw)dairy *** existing technology for handling animal slurry is the separation into a liquid and a solid manure *** solid fraction can be used as compost and bedding materials,and it has limited environmental ***,the emissions from the storage of liquid manure need further *** cycle of manure production,collection,transportation,separation and storage can only be closed if the nutrients are eventually applied to grass and arable land according to crop ***,distribution of knowledge on nutrient levels,crop needs and nutrient management plans,supported by legislation on maximum application standards,is *** this way,an environmentally friendly development of dairy manure management might be possible.

关键词： dairy manure manure handling pattern legislation nutrient recycling emissions

初中数学教师新课程实施情况及影响因素研究——以成都市龙泉驿区导学讲评式教学为例

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

数学教育学报 2019年第6期28卷 21-26页

作者：赵文君莫雅慈曹一鸣四川师范大学数学科学学院四川成都610068 香港大学教育学院香港999077 北京师范大学数学科学学院北京100875

对成都市龙泉驿区导学讲评式教学跟踪调查6年,基于16位教师64节课堂录像的编码分析及两位教师访谈的分析研究表明:导学讲评式教学的实施情况较好,绝大部分教师的课堂教学方式发生了转变,表现为课堂中学生参与水平明显提高;影响教师导学... 详细信息

对成都市龙泉驿区导学讲评式教学跟踪调查6年,基于16位教师64节课堂录像的编码分析及两位教师访谈的分析研究表明:导学讲评式教学的实施情况较好,绝大部分教师的课堂教学方式发生了转变,表现为课堂中学生参与水平明显提高;影响教师导学讲评式教学实施情况的因素包括教师对改革理念的态度和理解、领导的期望、同事的合作、学生情况、考试和教学进度的压力等.课程改革中,要将新课程理念转化为具有较强可操作性的教学指导;要缓解部分教师对新课程实施的消极态度.

关键词：初中数学教师新课程实施导学讲评式教学教师专业发展