检索结果-南通市图书馆

Novel heating-and deformation-induced phase transitions and mechanical properties for multicomponent Zr_(50)M_(50),Zr_(50)(M,Ag)_(50)and Zr_(50)(M,Pd)_(50)(M=Fe,Co,Ni,Cu)amorphous alloys

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 Materials Science & Technology 2022年第9期104卷 109-118页

作者： J.Ding A.Inoue F.l.Kong S.l.Zhu Y.l.Pu E.Shalaan A.A.Al-Ghamdi A.l.Greer School of Materials Science and Engineering Tianjin UniversityTianjin 300072China International Institute of Green Materials Josai International UniversityTogane 283-8555Japan Institute of Massive Amorphous Alloy Science China University of Mining TechnologyXuzhou 221116China Department of Physics King Abdulaziz UniversityJeddah 22254Saudi Arabia MISiS National University of Science and TechnologyMoscow 119049Russia School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Multicomponent alloys of Zr_(50)M_(50),Zr_(50)(M,Ag)_(50)and Zr_(50)(M,Pd)_(50)(M=Fe,Co,Ni,Cu)can be melt-spun to obtain amorphous *** maximum thickness for fully amorphous ribbons varies with composition in the range 34-53μ*** contrast,fully amorphous ribbons are not obtainable for binary Zr_(50)Ni_(50)or ternary Zr_(50)(Ni,Cu)_(50)***-induced crystallization occurs through:two stages of amorphous[am]→[~(am')+B2]→[B2+B33]for Zr_(50)M_(50);and[am]→[am'+B2]→[B2+AgZr]for Zr_(50)(M,Ag)_(50);and a single stage of[am]→[B2]for Zr_(50)(M,Pd)_(50),while no B2 phase is formed for the binary and ternary Zr_(50)Q_(50)(Q=Ni or/and Cu)***-spun amorphous ribbons have good bending ***,Zr_(50)M_(50)ribbons in tension show 0.22-0.28%plastic elongation and work-hardening(the yield stress is~820 MPa,the fracture stress is~1200 MPa).When cold-rolled at room temperature to 30%reduction in thickness,Zr_(50)M_(50)ribbons show 10%increase in hardness,while retaining good bending ***-rolling induces precipitation of spheroidal B2 and irregular B33 particles,while deformation in tension induces B2,B33 and also plate-like monoclinic *** B2 and B33 particles form by polymorphic transformation,and include a high density of internal *** novel deformationinduced precipitation has not been recognized for any Zr_(50)Q_(50)binary or ternary *** new multicomponent systems are encouraging for future progress as structural amorphous alloys.

关键词： Multicomponent Microstructure Mechanical properties Phase transition Amorphous alloy

A Reinvestigation of the Physical Properties of Pismis 3 based on 2MASS Photometry

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2008年第3期8卷 362-368页

作者： Tadross A.l. National Research Institute of Astronomy and Geophysics 11421-HelwanCairoEgypt

As a continuation of a series of work, we aim to refine and re-determine the physical parameters of previously rarely or un-studied open star clusters with good quality CMDs using Near-IR JHK photometry. Here we present a morphological analysis of the 2MASS database （the digital ＂Two Micron All Sky Survey＂） for the open cluster Pismis 3. Some of the physical parameters are estimated for the first time, and some others, re-determined.

关键词： techniques photometric -- Galaxy open clusters and associations -- stars luminosity function -- stellar clusters individual Pismis 3

在线全文

学校读者我要写书评

暂无评论

西安地区犬和猫肿瘤流行现状与防治对策

动物医学进展 2025年第1期46卷 128-134页

作者：白佳秀吕子颖段学鹏韩永荣郭抗抗吕长荣西北农林科技大学动物医学院陕西杨凌712100 海南大学热带农林学院海南海口570228 西北农林科大西安动物医院陕西西安710065

通过对西北农林科大西安动物医院4年7个月共收治的西安地区7399例(犬4813例,猫2586例)犬和猫病例中308例肿瘤的分析,发现犬、猫肿瘤发病率分别为5.96%和0.81%;最常发的肿瘤有乳腺肿瘤、恶性淋巴瘤、脂肪瘤、肥大细胞瘤与肛周腺瘤。犬发... 详细信息

通过对西北农林科大西安动物医院4年7个月共收治的西安地区7399例(犬4813例,猫2586例)犬和猫病例中308例肿瘤的分析,发现犬、猫肿瘤发病率分别为5.96%和0.81%;最常发的肿瘤有乳腺肿瘤、恶性淋巴瘤、脂肪瘤、肥大细胞瘤与肛周腺瘤。犬发病品种以贵宾犬、牧羊犬与金毛犬居多,分别占24.64%、12.56%和11.59%;小型犬发病率最高,占51.57%。老龄犬多发,但9岁以下犬发病率也高达33.45%。发病季节集中在冬春季节。发病部位以乳腺和皮肤最多,分别占29.27%和21.95%。雌性犬、猫发病率分别为58.19%和42.86%,雄性犬、猫发病率分别为41.81%和57.14%;未绝育雌性犬、猫更易发生乳腺肿瘤与泌尿生殖道肿瘤,未去势雄性犬、猫更易发生肛周肿瘤。组织活检与组织病理学结果显示良性肿瘤占58.51%,恶性肿瘤占41.49%。

关键词：肿瘤犬猫流行现状防治对策

An Alternative to Free Entropy for Free Group Factors

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2003年第3期19卷 419-472页

作者： MichalDOST/~l DonHADWIN Mexicka4 Praha10CZ-10100CzechRepublic DepartmentofMathematics UniversityofNewHampshireDurhamNH03824-3591USA

In this paper we define a very simple invariant η(V^-) for a k-tuple V^-of unitaries in a finite factor von Neumann algebra, and we show how this invariant can replace free entropy in many of the important applications. We also introduce a notion of metric free entropy and some related *** include proofs, using η, of the theorems of liming Ge and of D. Voiculescu, respectively, on the primeness of and on the absence of Cartan snbalgebras in the noncommutative free group factors.

关键词： FREE groups AlGEBRA

Existence for a Class of Non-Newtonian Fluids with a Nonlocal Friction Boundary Condition

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

Acta Mathematica Sinica,English Series 2006年第2期22卷 523-534页

作者： l.CONSIGlIERI Department of Mathematics and CMAF Sciences Faculty of University of Lisbon 1749-016 Lisboa Portugal

We deal with a variational inequality describing the motion of incompressible fluids, whose viscous stress tensors belong to the subdifferential of a functional at the point given by the symmetric part of the velocity gradient, with a nonlocal friction condition on a part of the boundary obtained by a generalized mollification of the stresses. We establish an existence result of a solution to the nonlocal friction problem for this class of non-Newtonian flows. The result is based on the Faedo-Galerkin and Moreau Yosida methods, the duality theory of convex analysis and the Tychonov-Kakutani-Glicksberg fixed point theorem for multi-valued mappings in an appropriate functional space framework.

关键词： Non-Newtonian fluids Coulomb and nonlocal friction

Acoustic Velocities and Elastic Properties of Pyrite (FeS2) to 9.6 GPa

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2010年第5期21卷 792-800页

作者： Matthew l Whitaker Mineral Physics Institute Stony Brook University Geodynamics Research Center Ehime University

Ultrasonic interferometry was utilized in conjunction with synchrotron-based X-ray diffraction and X-radiographic imaging to determine the compressional and shear wave velocities and unlt-cdl volumes of pyrite （FeS2） at room temperature and pressures up to 9.6 GPa. Fitting all of the experimental volume and velocity data to third-order finite-strain equations yielded the adiabatic zero-pressure bulk and shear moduli and their first pressure derivatives： Ks0=138.9（7） GPa, Go=U2.3（3） GPa, （δKS0/δP）T=KS0＇=6.0（1）, （δG0/δP）T=G0＇=3.0（〈1）, where the numbers in parentheses represent the 1δ uncertainty in the last significant digit. These results are in good agreement with several previous static compression studies on this material but differ quite strongly from the results obtained via first principles calculations. This study presents the first direct measurement of the bulk shear properties of this material.

关键词： mineral physics ultrasonic interferometry high pressure iron sulfide elastic property equation of state.

IN SITU TEM OBSERVATION OF AMORPHOUS Nd_(x)Fe_(1-x)THIN FIlMS AND THEIR CRYSTAllIZATION

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 1993年第11期6卷 387-392页

作者： lÜ Manqi WAGENDRISTEl A State Key laboratory of Rapidly Solidified and Non-Equilibrium Alloys International Centre for Meterials PhysicsInstitute of Metal ResearchAcademia SinicaShenyangChina Institut fur Anwend Physik Technische Universitat in WienAustria

The room temperature stability and crystallization of amorphous Nd_xFe_(1-x)thin films with x=0.06—0.90,prepared by flash evaporation at 77 K,were investigated by X-ray diffraction and TEM *** amorphous Nd_xFe_(1-x)films are stable at room temperature when 0.19long the surface of film as very thin flakes and become thick only at relatively high *** complete crystallization,the Nd_xFe_(1-x)films with xl Nd,but no NdFe2,a phase expected to occur by phase diagram.

关键词： amorphous film Nd-Fe film crystallization

The evolution and refinements of varicocele surgery

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2016年第2期18卷 171-178,J0002页

作者： Joel l Marmar Director of Men's Health Services Planned Parenthood of Southern New Jersey 317 S. Broadway Camden NJ 08103 USA.

Varicoceles had been recognized in clinical practice for over a century. Originally, these procedures were utilized for the management of pain but, since 1952, the repairs had been mostly for the treatment of male infertility. However, the diagnosis and treatment of varicoceles were controversial, because the pathophysiology was not clear, the entry criteria of the studies varied among centers, and there were few randomized clinical trials. Nevertheless, clinicians continued developing techniques for the correction of varicoceles, basic scientists continued investigations on the pathophysiology of varicoceles, and new outcome data from prospective randomized trials have appeared in the world＇s literature. Therefore, this special edition of the Asian Journal of Andrology was proposed to report much of the new information related to varicoceles and, as a specific part of this project, the present article was developed as a comprehensive review of the evolution and refinements of the corrective procedures.

关键词： antegrade sclerosis laparoscopic varicocelectomy microsurgical varicocelectomy percutaneous embolization varicocelectorny

Hua's Theorem on Five Almost Equal Prime Squares

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

Acta Mathematica Sinica,English Series 2006年第3期22卷 907-916页

作者： Guang Shi l Department of Mathematics Shandong University

In this paper we sharpen Hua＇s result by proving that each sufficiently large integer N congruent to 5 modulo 24 can be written as N=p1^2＋p2^2＋p3^2＋p4^2＋p5^2,with │pj-√N/5│≤U=N^1/2-1/28＋ε,where pj are primes.

关键词： Additive theory of prime numbers Circle method iterative method