检索结果-南通市图书馆

Thermo-kinetic characteristics on stabilizing hetero-phase interface of metal matrix composites by crystal plasticity finite element method

引用

Journal of Materials science & Technology 2024年第2期169卷 53-67页

作者： Y.B.Zhang s.J.song F.Liu state Key Laboratory of solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical&Testing center Northwestern Polytechnical UniversityXi’an 710072China

Using dislocation-based constitutive modeling in three-dimension crystal plasticity finite element(3D CPFE)simulations,co-deformation and instability of hetero-phase interface in different material systems were herein studied for polycrystalline metal matrix composites(MMCs).Local stress and strain fields in two types of 3layer MMCs such as fcc/fcc Cu-Ag and fcc/bcc Cu-Nb have been predicted under simple compressive ***,more severe strain-induced interface instability can be observed in the fcc/bcc systems than in the fcc/fcc systems upon refining to metallic nanolayered composites(MNCs).By detailed analysis of stress and strain localization,it has been demonstrated that the interface instability is always accompanied by high-stress concentration,i.e.,thermodynamic characteristics,or high strain prevention i.e.,kinetic characteristics,at the hetero-phase *** then follows that the thermodynamic driving forceG and the kinetic energy barrier Q during dislocation and shear banding can be adopted to classify the deformation modes,following the so-called thermo-kinetic *** by inserting a high density of high-energy interfaces into the Cu-Nb composites,such thermo-kinetic integration at the hetero-phase interface allows a successful establishment of MMCs with the high△G-high Q deformation mode,which ensures high hardening and uniform strain distri-bution,thus efficiently suppressing the shear band,stabilizing the hetero-phase interface,and obtaining an exceptional combination in strength and *** hetero-phase interface chosen by a couple of thermodynamics and kinetics can be defined as breaking the thermo-kinetic correlation and has been proposed for artificially designing MNCs.

关键词： Thermodynamics and kinetics Physics-based constitutive modeling Hetero-phase interface Crystal plasticity finite element

来源：

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

Hydrogen sulfide ameliorates vascular calcification induced by vitamin D3 plus nicotine in rats

引用

Acta Pharmacologica sinica 2006年第3期27卷 299-306页

作者： sheng-ying WU~(2,6) Chun-shui PAN~3 Bin GENG~3 Jing ZHAO~3 Fang YU~3 Yong-zheng PANG~3 Chao-shu TANG~4 Yong-fen QI~(3,4,5) ~2Institute of cardiovascular Disease,Peking University First Hospital.Beijing 100034 ~3Department of Physiology and Pathophysiology,Peking University Health science center,Beijing 100083,China,~4Key Laboratory of Molecular cardiovascular science,Ministry of Education,Beijing 100083,China 2Institute of cardiovascular Disease Peking University First Hospital Beijing 100034 China 3Department of Physiology and Pathophysiology Peking University Health Science Center Beijing 100083 China 3Department of Physiology and Pathophysiology Peking University Health Science Center Beijing 100083 China 3Department of Physiology and Pathophysiology Peking University Health Science Center Beijing 100083 China 3Department of Physiology and Pathophysiology Peking University Health Science Center Beijing 100083 China 3Department of Physiology and Pathophysiology Peking University Health Science Center Beijing 100083 China 4Key Laboratory of Molecular cardiovascular science Ministry of Education Beijing 100083 China 4Key Laboratory of Molecular cardiovascular science Ministry of Education Beijing 100083 China

Aim:To investigate the role of the endogenous cystathionine γ-synthase(CsE)/hydrogen sulfide(H2s)pathway in vascular calcification in ***:A ratvascular calcification model was established by administration of vitamin D3 plusnicotine(VDN).The amount of CsE and osteopontin(OPN)mRNA was deter-mined by using semi-quantitative reverse-transcription polymerase chain *** calcium content,45Ca2+accumulation and alkaline phosphatase(ALP)activitywere measured.H,s production and CsE activity were ***:yonKossa staining produced strong positive black/brown staining in areas amongthe elastic fibers of the medial layer in the calcified *** calcium content,45Ca2+accumulation and ALP activity in calcified arteries increased by 6.77-,1.42-,and 1.87-fold,respectively,compared with *** expression of the OPNgene was upregulated(Pssion of the CsE gene was ***,calcium content,45Ca2+uptake and ALP activity in the VDN plus NaHsgroup was lower than that in the VDN *** content of calcium and45Ca2+accumulation and activity of ALP in the aorta were 34.8%,40.75% and 63.5% lowerin the low-dosage Naris group than in the VDN group,respectively(Psition of45Ca2+and activity of ALP was 83.9%,37.8 % and 46.2% lower in the aorta in the high-dosage Naris group than in theVDN group,respectively(Pssion of the OPN gene ***:The production of H,s,and CsE activity were de-creased and CsE gene expression was downregulated in rats with vascularcalcification.H2s can ameliorate vascular calcification,suggesting that the H2s/CsE pathway plays a regulatory role in the pathogenesis of vascular calcification.

关键词： hydrogen sulfide cystathionine-lyase vascular calcification mRNA

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

seasonal water storage change of the Yangtze River basin detected by GRACE

引用

science China Earth sciences 2006年第5期49卷 483-491页

作者： HU Xiaogong1, CHEN Jianli1,2, ZHOU Yonghong1, HUANG Cheng1 & LIAO Xinhao1 1. center for Astro-geodynamics Research, shanghai Astronomical Observatory, national Astronomical Observatories, shanghai 200030, China 2. center for space Research, University of Texas at Austin, 3925 W. Braker Lane, suite 200, Austin, TX78750, UsA 1. center for Astro-geodynamics Research Shanghai Astronomical Observatory National Astronomical Observatories Shanghai 200030 China 2. center for space Research University of Texas at Austin 3925 W. Braker Lane Suite 200 Austin TX 78750 USA

Us-Germany co-sponsered satellite gravimetry mission GRACE (Gravity Recovery And Climate Experiment), launched in March 2002, has been producing monthly time series of Earth gravity models up to degree and order of 120. The GRACE mission consists of two identical satellites flying on an almost polar orbit with an altitude of about 300-500 km and satelite-to-satellite ranging of about 220 km. Thanks to the payloads of space-borne GPs receivers, accelerometers and high-precision K-band satelite-to-satellite ranging mesurements, GRACE gravity models are expected to achieve more than one order of magnitude of improvement over previous models at spatial scales of a few hundred kilometers or larger. Recovery of surface mass re-distribution based on GRACE’s time-varying gravity models is applied to studies in solid Earth geophysics, oceanography, climatology and geodesy. At secular time scales, GRACE is expected to provide valuable information on global ice changes, whose variations have profound influences on global climate, and in particular, on sea level changes. At seasonal time scales, GRACE is expected to reveal surface water changes with an ac- curacy of less than 1 cm, or ocean bottom pressure changes with an accuracy of less than 1 mbar (1 mbar =102 Pa). These surface mass redistribution measurements would impove our understanding of the global and regional mass and energy cycles that are critical to human life. Using 15 GRACE monthly gravity models covering the period from April 2002 to December 2003, this study compares seasonal water storage changes recovered from GRACE data and hydrology models at global and regional scales, with particular focus on the Yangtze River basin of China. Annual amplitude of 3.4 cm of equivalent water height change is found for the Yangtze River basin with maximum in spring and Autumn, agreeing with two state-of-the-art hydrology models. The differences between GRACE re- sults and model predictions are less than 1-2 cm. We conclude

关键词： GRACE, earth gravity, water storage, Yangtze River basin.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

引用

第五届亚洲儿科研究大会

作者： Jia Hou~1 Yonghao Gui~1 Yuexiang Wang~2 Houyan song~2 1.cardiovascular center Children’s Hospital of Fudan University 2.national Key Laboratory of Molecular Medicine Fudan University 201102 cardiovascular center Children''s Hospital of Fudan University National Key Laboratory of Molecular MedicineFudan University 201102

＜正＞Objectives To set up a model of retinal dehydrogenase type 2（raldh2） gone knock-down zebrafish embryos, and to study the effect of insufficient retinoid acid（RA） signaling on early embryonic cardiac developm...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Immunomodulatory effects and mechanisms of plant alkaloid tetrandrine in autoimmune diseases

引用

Acta Pharmacologica sinica 2002年第12期23卷 40-48页

作者： LAI Jenn-HaungRheumatology/Immunology and Allergy, Department of Medicine, Tri-service General Hospital, national Defense Medical center, Taipei, Taiwan, China Rheumatology/Immunology and Allergy Department of Medicine Tri-Service General Hospital National Defense Medical Center Taipei Taiwan China

Autoimmune diseases characterized by activation of immune effector cells and damage of target organs are currently treated with a combination of several disease-modifying antirheumatic drugs (DMARDs) that preserve different immunomodulatory mechanisms. such a combination treatment strategy not only provides synergistic effects but also reduces side effects from individual drug. Tetrandrine (Tet), purified from a creeper stephania tetrandra s Moore, is a bis-benzylisoquinoline alkaloid and has been used to treat patients with silicosis, autoim-mune disorders, and hypertension in China’s mainland for decades. The accumulated studies both in vitro and in vivo reveal that Tet preserves a wide variety of immunosuppressive effects. Importantly, the Tet-mediated immu-nosuppressive mechanisms are evidently different from some known DMARDs. The synergistic effects have also been demonstrated between Tet and other DMARDs like FK506 and cyclosporin. These results highlight Tet a very potential candidate to be consid

关键词： tetrandrine T-lymphocytes autoimmune diseases alkaloids

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

semantic theory of finite lattice-valued propositional logic

引用

science China(Information sciences) 2010年第10期53卷 2022-2031页

作者： PAN XiaoDong 1,2 & XU Yang 2 1 school of Maths, southwest Jiaotong University, Chengdu 610031, China 2 Intelligent Control Development center, southwest Jiaotong University, Chengdu 610031, China 1. school of Maths Southwest Jiaotong University Chengdu 610031 China2. Intelligent Control Development Center Southwest Jiaotong University Chengdu 610031 China

Based on the methodology of Pavelka’s fuzzy propositional logic, in this paper, by combining L-fuzzy set and classical two-value propositional logic theory, a kind of graded semantic theory in lattice-valued propositional logic based on finite lattice implication algebras is established. The notions of L-tautology and L-contradiction are introduced, and several theorems about the relations among different kinds of L-tautologies are given. From the viewpoint of uncertainty reasoning, the notion of satisfiability with certain level for a set of formulas is also defined. On this basis, the semantic consequence operation concerning a set of formulas is proposed, and the properties of semantic consequence operation and the consistency of fuzzy information are discussed.

关键词： lattice-valued propositional logic semantic theory L-tautology consistency lattice implication algebra

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in China’s climate change study in the 20th century

引用

Journal of Geographical sciences 2004年第S1期 5-13页

作者： ZHAI Panmao1,2, CHAO Qingchen1,2, ZOU Xukai1,2(1. Laboratory for Climate studies, China Meteorological Administration, Beijing 100081, China 2. national Climate center, China Meteorological Administration, Beijing 100081, China)

studies on the 20th century climate change in China have revealed that under the background of global warming over the past century, climate in China has also experienced significant change with mean annual temperature increased by about 0.5 oC. More reliable results for the latter part of the 20th century indicate that the largest warming occurred in Northwest China, North China and Northeast China, and the warming in winter is most significant. Although no obvious increase or decrease trends were detected for mean precipitation over China in the past half century, regional differences are very distinct. In the middle and lower reaches of the Yangtze River, precipitation increased, while that in the Yellow River Basin markedly decreased. studies suggest that climate change in China seems to be related not only with the internal factors such as ENsO, PDO, and the others, but also with the anthropogenic effects such as greenhouse gas emissions, and land use. The future climate change studies in China seem to be important in narrowing understanding the nature of China's climate change and its main causes, since it is significant for projection and for impact assessment of climate change in the future.

关键词： th century climate change China

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

婴幼儿重点呼吸道病毒感染性疾病预防指南

引用

中国妇幼卫生杂志 2024年第5期15卷 1-6页

作者：国家卫生健康委妇幼健康中心中华预防医学会儿童保健分会徐韬邓继岿印根权郑东旖王琳不详国家卫生健康委妇幼健康中心深圳市儿童医院广州医科大学附属妇女儿童医疗中心清华大学第一附属医院首都儿科研究所附属儿童医院

呼吸道病毒是婴幼儿群体中常见的感染性病原体,其所导致的发病和死亡给家庭和社会造成巨大的疾病负担。一般性预防措施和疫苗、单克隆抗体等特异性预防手段的结合,能有效阻止呼吸道病毒传播,降低婴幼儿的患病风险。目前,公众对婴幼儿等... 详细信息

呼吸道病毒是婴幼儿群体中常见的感染性病原体,其所导致的发病和死亡给家庭和社会造成巨大的疾病负担。一般性预防措施和疫苗、单克隆抗体等特异性预防手段的结合,能有效阻止呼吸道病毒传播,降低婴幼儿的患病风险。目前,公众对婴幼儿等弱势群体呼吸道疾病预防的关注度日益提高。国家卫生健康委妇幼健康中心、中华预防医学会儿童保健分会组织专家制定本指南,旨在增强各级医疗卫生机构医务人员对婴幼儿呼吸道病毒感染性疾病的预防意识和专业技能,促进其积极采取综合防控措施,推广有效的创新技术和预防手段,以实现对婴幼儿广泛、高效和长期的保护,提升儿童远期健康水平。

关键词：婴幼儿呼吸道感染流感病毒呼吸道合胞病毒疫苗单克隆抗体

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Corrosion Measurements of Reinforcing steel by Different Electrochemical Techniques

引用

Journal of Materials science & Technology 1995年第6期11卷 447-451页

作者： s.M.Morsy (Metallurgy Dept. Nuclear Research center, Atomic Energy Authority, Cairo, Egypt) I.Z.selim (Physical Chemistry Dept., national Research center, Dokki, Cairo, Egypt)s. H. Tantawi (Building Research Institute, Dokki, Cairo, Egypt) Atomic Energy Authority Cairo Egypt

Electrochemical techniques of the corrosion measurements of reinforcing steeI in concrete have been evaluated. These techniques include half-cell potential measurements, impressed voltage method, impressed current method and potentiostatic polarization technique. The results of corrosion behaviour of the steel in both 5%NaCl and 5%MgsO4 show that each electrochemical technique provides some information about the condition of the steel bar or the corrosivity of the environment being evaluated, yet none provides a complete data regarding the corrosion resistance of reinforcing steel in aggressive media

关键词： Corrosion Measurements of Reinforcing steel by Different Electrochemical Techniques

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

中国百日咳诊疗与预防指南(2024版)

引用

中华医学杂志 2024年第15期104卷 1258-1279页

作者：中华医学会感染病学分会儿科感染学组国家卫生健康委能力建设和继续教育儿科专委会感染组中国临床实践指南联盟方法学专委会国家儿童医学中心(上海) 国家传染病医学中心曾玫邵祝军张文宏夏君蔡洁皓陈明亮冯天行姚开虎不详复旦大学附属儿科医院感染传染科国家儿童医学中心(上海)上海200032 中国疾病预防控制中心传染病预防控制所北京102206 复旦大学附属华山医院感染科国家传染病医学中心上海200040 宁波诺丁汉大学GRADE中心宁波315100 复旦大学附属儿科医院感染传染科复旦大学附属闵行医院检验科上海临床研究中心儿科首都医科大学附属北京儿童医院北京市儿科研究所感染与微生物研究室国家儿童医学中心(北京)

百日咳再现是全球性的公共卫生问题,2018—2022年我国国内百日咳报告发病率接近20世纪80年代末的报告水平。实际上,我国的百日咳发病率被严重低估,主要因为国内尚未全面建立百日咳主动监测工作,不典型百日咳病例在临床上容易被漏诊,许... 详细信息

百日咳再现是全球性的公共卫生问题,2018—2022年我国国内百日咳报告发病率接近20世纪80年代末的报告水平。实际上,我国的百日咳发病率被严重低估,主要因为国内尚未全面建立百日咳主动监测工作,不典型百日咳病例在临床上容易被漏诊,许多医疗机构未开展百日咳的实验室诊断;同时,我国还面临百日咳鲍特菌对一线抗菌药物大环内酯类高度耐药的临床问题。为了更好地指导和规范我国百日咳病例的临床诊疗、监测和防控工作,由感染病学、流行病学、免疫规划及指南方法学专家组成指南制订小组,从实践角度提出有关百日咳诊断、治疗、预防,尤其是疫苗免疫策略的12个临床问题,经过研究问题构建、证据检索和综合、证据评价以及证据到推荐意见讨论,制订推荐意见和实施建议,为从事百日咳诊疗和防控的临床医师、微生物实验室专业人员、医院感染控制专业人员以及公共卫生领域从事传染病防控和免疫规划的专业人员提供参考。

关键词：百日咳诊断治疗预防疫苗接种

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：