检索结果-南通市图书馆

Anatomic Correlates of Mitral Systolic Anterior Motion in Transposition of the Great Arteries Following Atrial Switch Operation

引用

Congenital Heart Disease 2023年第3期18卷 267-277页

作者： Norman Aiad Mark V.Sherrid Adam j.Small Youssef elnabawi jodi Feinberg Leon Axel Ralph Mosca T.K.Susheel Kumar Michael Argilla Dan G.halpern Cardiovascular Division Leon H.Charney Division of CardiologyNYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Department of Cardiovascular Disease Medical SchoolThe University of MinnesotaMinneapolisUSA The Lillehei Heart Institute MinneapolisMNUSA Radiology Department NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Cardiothoracic Surgery Department NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Pediatric Cardiology Division NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Department of Internal Medicine NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA

Introduction:We sought to investigate whether the development of sub-pulmonic systolic anterior motion(SAM)may be inherent to the anatomy of the the mitral valve(MV)or affected by external factors,such as a dilated right ventricle or chest abnormalities in d-looped transposition of the great arteries post atrial switch operation(d-TGA/AtS).Methods:Analysis was performed of clinical and cardiac imaging studies acquired on 19 adult patients with d-TGA/AtS(age 42±6 years old,56%male)between 2015–*** data included mitral apparatus anatomy,and CT/MRI data included biventricular dimensions,function,and Haller index(HI)for pectus ***:Patients with leaflet SAM(n=6)compared to patients without SAM(n=13)had higher MV protrusion height(2.3±0.5 vs.1.5±0.4 cm,p≤0.01)and longer anterior MV leaflet length(3.1±0.4 cm vs.2.6±0.3 cm p≤0.05),when compared to those ***/MRI showed higher sub-pulmonic left ventricular ejection fraction(LVeF)in the SAM group(71%±8%vs.54%±7%,respectively).RV size and function,significant chest deformity(HI>3.5),presence of a ventricular lead pacemaker,and septal thickness did not play a role in development of ***:An elongated mitral apparatus is associated with the development of SAM,and the development of left ventricular outflow tract obstruction(LVOTO),in d-TGA/*** hyperkinesia is associated with *** RV dimensions,septal thickness,and degree of chest deformity did not differ significantly between subjects with SAM and those without.

关键词： d-loop transposition of the great arteries mustard operation senning operation systolic anterior motion of the mitral valve echocardiography cardiac MRI

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

GUIDeD WAVeS IN MULTILAYeReD PLATeS: AN IMPROVeD ORTHOGONAL POLYNOMIAL APPROACH

引用

Acta Mechanica Solida Sinica 2014年第5期27卷 542-550页

作者： jiangong Yu j.e.Lefebvre L.elmaimouni School of Mechanical and Power engineering Henan Polytechnic University Department of Civil engineering University of Siegen Univ Lille Nord de France F-59000 Lille France UVHC IEMN-DOAE F-59313 Valenciennes Cedex 9 France CNRS UMR 8520 F-59650 Villeneuve d’Ascq France eRSITA Faculte Polydisciplinaire d’Ouarzazate Univ. Ibn Zohr 45000 Ouarzazate Morocco LMTI Faculte des Sciences d’Agadir Universite Ibn Zohr BP 28/S Agadir Morocco

Conventional orthogonal polynomial approach can solve the multilayered plate only when the material properties of two adjacent layers do not change significantly. This paper de- veloped an improved orthogonal polynomial approach to solve wave propagation in multilayered plates with very dissimilar material properties. Through numerical comparisons among the exact solution, the results from the conventional polynomial approach and from the improved poly- nomial approach, the validity of the improved polynomial approach is illustrated. Finally, it is shown that the conventional polynomial approach can not yield correct continuous normal stress profiles. The improved orthogonul polynomial approach has overcome this drawback.

关键词： multilayered plate orthogonal polynomial dispersion curves stress profiles

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

Copper hydrometallurgy—current status, preliminary economics, future direction and positioning versus smelting

引用

中国有色金属学会会刊：英文版 2004年第3期14卷 560-568页

作者： j. Peacey GUO Xian-jian e. Robles Hatch Associates Ltd. Hatch Associates Ltd. Hatch Ingenierosy Consultores Ltda. 2800 Speakman Drive Mississauga Ontario L5K 2R7 Canada2800 Speakman Drive Mississauga Ontario L5K 2R7 CanadaSan Sebastian 2839 Piso 9 Las Condes Santiago 6760226 Chile

The heap leaching of oxide copper ores with copper cathode recovery by solvent extraction and electro-winning is now well established as a low-cost method of copper recovery. This technology has recently been applied successfully to mixed oxide and chalcocite ores, notably in Chile at Cerro Colorado, Quebrada Blanca and Zaldivar. Currently, there are significant development efforts underway to try to extend heap leaching to chalcopyrite ores. The success of heap leaching/SX/eW has also led to a revival in the development of hydrometallurgical processes to recover copper from chalcopyrite and other copper concentrates. The current status of copper hydrometallurgy is reviewed and the most commercially attractive potential applications are explored. The advantages and disadvantages of the hydrometallurgical treatment of chalcopyrite concentrates and its preliminary economics are compared with those for the current best practices in copper smelting and refining.

关键词：炼铜湿法冶金熔炼过滤 SX/eW 经济分析

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

Glycine-nitrate auto-combustion synthesis and magnetic properties of nanocrystalline NdAl_(x)Fe_(1-x)O_(3) perovskites

引用

journal of Rare earths 2023年第1期41卷 108-115页

作者： e.A.Nforna Hj.M.Ngantchou j.N.Ghogomu Department of Fundamental Science Higher Technical Teacher Training CollegeUniversity of BamendaP.O.Box 39BambiliCameroon Department of Chemistry Faculty of SciencesUniversity of DoualaP.O.Box 24157DoualaCameroon Department of Chemistry The University of BamendaP.O.Box 39BambiliCameroon Department of Chemistry University of DschangP.O.Box 67DschangCameroon

The effect of substitution of Fe^(3+) by Al^(3+) on the structure and magnetic properties of NdAl_(x)Fe_(1-x)O_(3) perovskite nano-powders(x=0.0,0.1,0.2,0.3,0.4,and 0.5) prepared by the glycine-nitrate auto-combustion method was *** samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SeM),Fourier transform infrared spectroscopy(FT-IR),and energy dispersive X-ray spectroscopy(eDX).The magnetic properties of the samples were investigated using a vibrating sample magnetometer(VSM).The X-ray results for all samples reveal the formation of an orthorhombic perovskite phase(space group Pbnm) with no secondary *** crystallite sizes of the nanoparticles are found to decrease with increasing Al content,and are in the range of 53-38 *** images show spherical nanoparticles with *** FT-IR spectra confirm the presence of metal oxygen *** M-H loop of the pristine NdFeO_(3) sample is antiferromagnetic in the a b plane with weak ferromagnetism in the *** AI inclusions in the pristine polycrystal thereby creating magnetic vacancies is seen to influence the magnetic *** magnetic dilution results in enhanced magnetisation at low Al content;x=0.1,0.2(saturation magnetisation being 2.08 and 2.05 emu/g,respectively) compared to the pristine sample with a saturation magnetisation of 1.43 emu/g due to increased exchange *** dilution with nonmagnetic dopant induces the phase transition from weak ferromagnetic to paramagnetic depending on the impurity *** coercive field for NdFeO_(3) is found to be equal to 1950 Oe and decreases with *** findings lay a ground work for research in tuning magnetic properties and in spintronics with potential applications in data storage,switches and electronic devices.

关键词： Anti-ferromagnetism Weak ferromagnetism Orthorhombic NdAl_(x)Fe_(1-x)O_(3) Perovskite nanopowders Magnetic dilution

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

COMPOSITION AND RHeOLOGY OF POLYAMIDe-6 OBTAINeD BY USING BI-AND TRI-FUNCTIONAL COUPLING AGeNTS

引用

Chinese journal of Polymer Science 2013年第1期31卷 58-70页

作者： j.j.M. Slot e. van Ruymbeke P.A.M. Steeman Materials Science Centre DSM Research Department of Mathematics and Computer Science Eindhoven University of Technology

A statistical approach is developed, based on a Monte Carlo method, in order to determine the statistical composition of a polyamide-6 sample composed of caprolactam （an AB-type monomer） and of a di-acid （A2 type） or a tri- acid （A3 type） as coupling agents. For this composition, the linear theological behavior of these systems is predicted using a tube-based theory. This allows us to show that while coupling agents of type A2 can be seen as flow improver, the effect of branching agents of type A3, depending on the synthesis recipe and the conversion level, can lead either to an increase or to a decrease of the viscosity. By adding specific amount of these agents, we also show that it is possible to obtain materials with the same zero-shear viscosity but with different shear thinning behavior. Furthermore, the polydispersity of linear samples of the same average number molecular weight, Mn, is discussed in function of the amount of A2 monomers they contain. Ranging from 2 to 1.5, this difference in polydispersity is expected to have a significant influence on the processing behavior of such materials.

关键词： Polyamide-6 Random branching Statistical composition Rheology Monte Carlo Tube theory.

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

Annual variation of adult survival of a south-temperate House Wren population in Argentina

引用

Avian Research 2024年第2期15卷 229-237页

作者： Gustavo j.Fernandez Mariana e.Carro Paulo e.Llambías Grupo de Investigacion en ecofisiología de Fauna Silvestre INIBIOMA-CONICETAsentamiento Universitario San Martín de los Andes(AUSMA)Universidad Nacional Del ComahuePasaje de la Paz 235(8370)San Martín de los AndesNeuquenArgentina Grupo de Investigacion de Biología de Aves IADIZA CCT-MendozaUniversidad Nacional de CuyoAvenida RuizLeal s/n Parque General San Martin5500MendozaArgentina

Identifying factors affecting the survival of individuals is essential for understanding the evolution of life-history traits and population *** numerous studies on this subject in north-temperate environments,there is a lack of equivalent studies at similar latitudes in the ***,we used a 14-year dataset of capture,banding,and resighting to estimate the annual variation in the apparent adult survival probability of a south-temperate population of House Wrens(Troglodytes aedon bonariae).We evaluated temporal variation in sur-vival and the effect of environmental(climatic)and demographic variables(adult abundance,total number of fledglings produced during each breeding season)on survival *** found that the probability of adult survival decreased as the abundance of breeding adults *** density-dependent effect could be related to the resident lifestyle of southern House Wrens,which could determine an intense competition for territories and resources that ultimately would affect their survival.

关键词： Annual variation CjS Density-dependence Survival Troglodytes aedon bonariae

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

Finite cell method compared to h-version finite element method for elasto-plastic problems

引用

Applied Mathematics and Mechanics(english edition) 2014年第10期35卷 1239-1248页

作者： A.ABeDIAN j.PARVIZIAN A.DSTeR e.RANK Department of Mechanical engineering Daneshpajoohan Higher Education Institute Department of Mechanical engineering Isfahan University of Technology Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10) Technische Universitt Hamburg-Harburg Lehrstuhl fr Computation in engineering Fakultt fr Bauingenieur-und Vermessungswesen Technische Universitt Mnchen

The finite cell method （FCM） combines the high-order finite element method （FeM） with the fictitious domain approach for the purpose of simple meshing. In the present study, the FCM is used to the Prandtl-Reuss flow theory of plasticity, and the results are compared with the h-version finite element method （h-FeM）. The numerical results show that the FCM is more efficient compared to the h-FeM for elasto-plastic problems, although the mesh does not conform to the boundary. It is also demonstrated that the FCM performs well for elasto-plastic loading and unloading.

关键词： finite cell method (FCM) h-version finite element method (h-FeM),Prandtl-Reuss quadtree octree

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

Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface

引用

Nano Research 2020年第1期13卷 145-150页

作者： Dogan Kaya Richard j.Cobley Richard e.Palmer Department of electronics and Automation Vocational School of AdanaCukurova University01160CukurovaAdanaTurkey Nanoscale Physics Research Laboratory School of Physics and AstronomyUniversity of BirminghamEdgbastonBirminghamB152TTUK College of engineering Swansea UniversityBay CampusFabian WaySwanseaSA18ENUK

Understanding the atomistic formation of oxide layers on semiconductors is important for thin film fabrication,scaling down conventional devices and for the integration of emerging research ***,the initial oxidation of Si(111)is studied using the scanning tunneling *** to the complete saturation of the silicon surface with oxygen,we are able to probe the atomic nature of the oxide layer *** establish the threshold for local manipulation of inserted oxygen sites to be+3.8 *** by combining imaging with local atomic manipulation are we able to determine whether inserted oxygen exists beneath surface-bonded oxygen sites and differentiate between sites that have one and more than one oxygen atom inserted beneath the *** to the creation of the thin oxide film we observe a flip in the manipulation rates of inserted oxygen sites consistent with more oxygen inserting beneath the silicon surface.

关键词： scanning tunneling microscopy(STM) local manipulation Si(111) oxidation

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

Predicting Interdiffusion in High Temperature Coatings

引用

Tsinghua Science and Technology 2005年第6期10卷 704-708页

作者： j. e. Morral Department of Materials Science and engineering Ohio State University Columbus Ohio 43210 USA

Interdiffusion can be a major cause of failure in coated parts that see service at elevated temperatures. Ways to measure the extent of interdiffusion and mathematical equations for predicting these measures are given. The equations are based on the error function solution to the diffusion equation and do not take into account variations of the diffusivity with composition. Also, when the substrate of the coating is multiphase, the equations do not take into account the precipitate morphology, but do take into account that precipitates can act as sinks or sources of solute as the average composition of the substrate varies. The equations are meant to be alloy design tools that indicate how changing substrate or coating chemistry will reduce the extent of interdiffusion.

关键词： interdiffusion high temperature coatings multicomponent diffusion multiphase diffusion coating design

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

SURFACe TReATMeNT OF POLY (eTHYLeNe TeRePHTHALATe) FABRIC WITH POLYeTHYLeNeIMINe

引用

Chinese journal of Polymer Science 1997年第4期15卷 311-318页

作者： O.j.ATeIZA I.HOLMe j.e.McINTYRe Department of Textile Industries The University of Leeds Leeds LS2 9JT UKDepartment of Textile Industries The University of Leeds Leeds LS2 9JT UKDepartment of Textile Industries The University of Leeds Leeds LS2 9JT UK

A branched polyethyleneimine (BPeI) was applied to poly(ethylene terephthalate)(PeT) fabric to improve its surface moisture absorption so that the fabric becomes lessliable to retention of electrostatic charg. The durability of this treatment was assessed bywashing and followed by measurement of charge development on the fabric. The treatedsamples showed improved surface wetting compared to the untreated. The results areconsistent with attachment of the BPeI to the PeT surface by a cross-linking mechanism.

关键词： Surface modification Polyester Antistatic Polyethyleneimine treatment

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：