检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

γMn基合金反铁磁畸变与高阻尼孪晶的形成

上海交通大学学报 2002年第1期36卷 28-31页

作者：邓华铭钟志源张骥华陈树川上海交通大学材料科学与工程学院上海200030 香港城市大学物理和材料科学系

根据反铁磁序引起的点阵畸变与磁长程序参量之间的关系 ,计算了 γMn- cu合金顺磁→反铁磁转变引起的点阵畸变 ,并将计算值与实验数据进行了比较 .通过 γMn- Fe基合金高阻尼特性测定 ,验证了反铁磁序与孪晶高阻尼的关系在其他锰基合金... 详细信息

根据反铁磁序引起的点阵畸变与磁长程序参量之间的关系 ,计算了 γMn- cu合金顺磁→反铁磁转变引起的点阵畸变 ,并将计算值与实验数据进行了比较 .通过 γMn- Fe基合金高阻尼特性测定 ,验证了反铁磁序与孪晶高阻尼的关系在其他锰基合金中同样存在的推测 .讨论了 γMn基合金高阻尼行为的物理本质 .结果表明 ,γMn- cu和 γMn- Fe合金顺磁→反铁磁转变引起的四方畸变均可触发微孪晶的形成。

关键词： γMn基合金反铁磁畸变高阻尼孪晶 γ锰基合金

在线全文

学校读者我要写书评

暂无评论

莢膜組織孢漿菌分離一例報告

微生物学报 1957年第3期 319-323页

作者：鍾之英郭輝玉周烱勳中山医学院微生物学教研组

組織孢漿菌病（Histoplasmosis）的病原,是莢膜組織孢漿菌（Histoplasma capsula-tum）。多侵犯網狀內皮系統,使肝、脾及淋巴結腫大,常形成鼻咽腔及舌部潰瘍。本菌係Darling氏（1906）首先在巴拿馬運河區患類似內臟黑熱病而死亡病人的... 详细信息

組織孢漿菌病（Histoplasmosis）的病原,是莢膜組織孢漿菌（Histoplasma capsula-tum）。多侵犯網狀內皮系統,使肝、脾及淋巴結腫大,常形成鼻咽腔及舌部潰瘍。本菌係Darling氏（1906）首先在巴拿馬運河區患類似內臟黑熱病而死亡病人的肝及脾切片中發現,外觀舆利什曼小體相似。Da Rocha-Lima（1912）會發現本菌能發芽而繁殖,認為是一種真菌,而和隱球菌（c.y.tococci）相近。隨後Hansmann及Schenken二氏（1933）以及DeMonbreum氏（1934）才確實證明本症是一種真菌病,後者並首次將本

关键词：菌落沙保小白鼠斜面

Molecular Dynamics Simulation of Behaviours of Non-Polar Droplets Merging and Interactions with Hydrophobic Surfaces

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2008年第4期5卷 271-281页

作者： y.y. yan c.y. Ji School of the Built Environment University of Nottingham Nottingham NG7 2RD UK

This paper presents a molecular dynamics simulation of the behaviours of non-polar droplets merging and also the fluid molecules interacting with a hydrophobic surface. Such behaviours and transport phenomena are popular in general microchannel flow boiling and two-phase flow. The droplets are assumed to be composed of Lennards-Jones type molecules. Periodic boundary conditions are applied in three coordinate directions of a 3-D system, where there exist two liquid droplets and their vapour. The two droplets merge when they come within the prescribed small distance. The merging of two droplets apart from each other at different initial distances is tested and the possible larger （or critical） non-dimensional distance, in which droplets merging can occur, is discussed. The evolution of the merging process is simulated numerically by employing the Molecular Dynamics （MD） method. For interactions with hydrophobic solid wall, a system with fluid confined between two walls is used to study the wetting phenomena of fluid and solid wall. The results are compared with those of hydrophilic wall to show the unique characteristics of hydrophobic interactions by microscopic methods.

关键词： molecular dynamics simulation mist flow droplets merging hydrophobic wetting

Ionic Liquid Mediated Synthesis of Lath Shaped cuO Micro-Assembles as Extremely Stable Anode Material for Lithium-Ion Batteries

在线全文

学校读者我要写书评

暂无评论

chinese Journal of chemistry 2017年第8期35卷 1299-1304页

作者： Man Wang Ruguang Ma ying Liu c.y. chung yonghong Deng Zhouguang Lu Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China State Key Laboratory of High Performance ceramics and Superfine Microstrueture Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China Department of Physics and Materials Science City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China

A novel lath-shaped cuO microassemble consisting of well-c.y.talized ultrafine nanoc.y.tals was prepared by an ionothermal method with the assistance of ionic liquids （ILs, 1-butyl-3-methylimidazolium tetrafluoroborate）. As anode material of lithium ion batteries, the ILs-cuO exhibits high specific capacity, durability and good rate per- formance, superior to bare cuO. At a high current density of 1000 mA·g^-1, after 100 cycles, ILs-cuO still retains a discharge capacity of 483.2 mAh·g^-1. The improved electrochemical performances could be ascribed to the unique microscale lath-shape cuO assembles composed of ultrafine nanostructure.

关键词： lithium ion batteries anode lath-shaped cuO micro-assembles ionic liquid

cyclic stress-controlled tests on offshore clay

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

Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 376-381页

作者： S.y. Thian c.y. Lee Department of civil Engineering Jalan Ikram-UnitenUniversiti Tenaga NasionalKajang43000Malaysia

One of the main concerns in cyclic behavior of soft clay is gradual degradation with the progression of loading cycle.A series of cyclic constant-volume direct simple shear(cDSS) loading tests was performed on Malaysia offshore clay to study its undrained *** testing program consists of stresscontrolled tests with cyclic shear ratio ranging from 0.34 to 0.83 at different overconsolidation ratios(OcRs).For a given cyclic stress ratio in stress-controlled tests,the accumulated cyclic strain and pore water pressure increase with elevated number of *** heavily overconsolidated clay specimens,the negative cyclic pore water pressure is generated followed by positive cyclic pore water pressure as cyclic tests *** post-cyclic strength of offshore clay specimens is reduced by undrained cyclic stresscontrolled loading.

关键词： Offshore clay cyclic degradation Undrained cyclic loading Shear strength Pore pressure Overconsolidation ratio(OcR)

PREDIcTION FOR FORMING LIMIT OF AL2024T3 SHEET BASED ON DAMAGE THEORy USING FINITE ELEMENT METHOD

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2006年第2期19卷 174-180页

作者： Tang c.y. Fan Jianping Tsui c.P. Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong China School of civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China

This paper presents the application of anisotropic damage theory to the study of forming limit diagram of A12024T3 aluminum alloy sheet. In the prediction of limiting strains of the aluminum sheet structure, a finite element cell model has been constructed. The cell model consists of two phases, the aluminum alloy matrix and the intermetallic cluster. The material behavior of the aluminum alloy matrix is described with a fully coupled elasto-plastic damage constitutive equation. The intermetallic cluster is assumed to be elastic and brittle. By varying the stretching ratio, the limiting strains of the sheet under biaxial stretching have been predicted by using the necking criterion proposed. The prediction is in good agreement with the experimental findings. Moreover, the finite element cell model can provide information for understanding the microscopic damage mechanism of the aluminum alloy. Over-estimation of the limit strains may result if the effect of material damage is ignored in the sheet metal forming study.

关键词： forming limit diagram (FLD) anisotropic damage finite element method (FEM) limit strain localized necking elasto-plastic deformation

creeping fat and gut microbiota in crohn’s disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 16-23页

作者： Ana EV Quaglio Daniéla O Magro Marcello Imbrizi Ellen cS De Oliveira Luiz c Di Stasi Ligia y Sassaki Verum Ingredients Botucatu Technology ParkBotucatu 18605-525São PauloBrazil Department of Surgery Faculty of Medical SciencesState University of CampinasCampinas 13083-970São PauloBrazil Department of Gastroenterology Faculty of Medical SciencesUniversity of CampinasCampinas 13083-970São PauloBrazil Department of Internal Medicine Medical SchoolSão Paulo State UniversityBotucatu 18618-686São PauloBrazil Department of Biophysics and Pharmacology Institute of BiosciencesSão Paulo State UniversityBotucatu 18618-689São PauloBrazil

In this article,we explored the role of adipose tissue,especially mesenteric adipose tissue and creeping fat,and its association with the gut microbiota in the pathophysiology and progression of crohn’s disease(cD).cD is a form of inflammatory bowel disease characterized by chronic inflammation of the gastrointestinal tract,influenced by genetic predisposition,gut microbiota dysbiosis,and environmental *** microbiota plays a crucial role in modulating immune response and intestinal inflammation and is associated with the onset and progression of ***,visceral adipose tissue,particularly creeping fat,a mesenteric adipose tissue characterized by hypertrophy and fibrosis,has been implicated in cD pathogenesis,inflammation,and *** bacteria from the gut microbiota may translocate into mesenteric adipose tissue,contributing to the formation of creeping fat and influencing cD *** creeping fat may be a protective barrier against bacterial invasion,its expansion can damage adjacent tissues,leading to *** gut microbiota through interventions such as fecal microbiota transplantation,probiotics,and prebiotics has shown potential in managing ***,more research is needed to clarify the mechanisms linking gut dysbiosis,creeping fat,and cD progression and develop targeted therapies for microbiota modulation and fat-related complications in patients with cD.

关键词： creeping fat Mesenteric adipose tissue Gut microbiota crohn’s disease Inflammatory bowel disease

Revisiting the intraseasonal,interannual and interdecadal variability of tropical cyclones in the western North Pacific

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

Atmospheric and Oceanic Science Letters 2018年第2期11卷 198-208页

作者： LI Richard c.y. ZHOU Wen city University of Hong Kong Shenzhen Research Institute Shenzhen China School of Energy and Environment Guy Carpenter Asia-Pacific Climate Impact Center City University of Hong Kong Hong Kong China

This paper reviews the recent progress and research on the variability of tropical cyclones(Tcs) at different time scales. Specific focus is placed on how different types of external forcings or climatic oscillations contribute to Tc variability in the western North Pacific(WNP). At the intraseasonal scale, recent advances on the distinctive impacts of the Madden–Julian Oscillation(MJO), the Quasi-biweekly Oscillation, and the asymmetric MJO modulation under different El Ni?o–Southern Oscillation(ENSO) states, as well as the influences of the Pacific–Japan teleconnection, are highlighted. Interannually, recent progress on the influences of the ENSO cycle, different flavors of ENSO, and impacts of Indian Ocean warming is presented. In addition, the uncertainty concerning interdecadal Tc variations is discussed, along with the recently proposed modulation mechanisms related to the zonal sea surface temperature gradient, the North Pacific Gyre Oscillation, and the Pacific Decadal Oscillation(PDO). It is hoped that this study can deepen our understanding and provide information that the scientific community can use to improve the seasonal forecasting of Tcs in the WNP.

关键词： Tropical cylones intraseasonal oscillation ENSO Pacific-Japan teleconnection

coercivity Enhancement of Nd-Fe-B Thin Film Magnets through Dy Surface Diffusion Process

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第9期27卷 826-830页

作者： c.y. you J. Zhu N. Tian Z.X. Lu State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

The Dy capping layer was deposited at different temperatures on the Nd-Fe-B thin films to investigate the mechanism of the coercivity enhancement through the Dy surface diffusion. The highest coercivity of 2005 kA/m （25.2 kOe） was obtained at the Dy deposition temperature of 460℃, which was significantly higher than the value of 1297 kA/m （16.3 kOe） without Dy capping layer. By performing the transmission electron microscopy （TEM） analysis, it was found that some of the grain boundaries were enriched with Nd element, which could be partly ascribed to the promotion by the Dy surface diffusion. In comparison to the evolution of the spin reorientation temperature of Nd2Fe14B phase after the deposition of the Dy capping layer, it is concluded that structural modification plays a significant role in the coercivity enhancement due to the Dy surface diffusion.

关键词： Nd-Fe-B thin film coercivity enhancement Dy layer Microstructure