检索结果-内蒙古大学图书馆

China Welding 2006年第3期15卷 55-58页

作者：张利国姬书得杨建国方洪渊李雅范 Institute of Astronautical Technology Shenyang Institute of Aeronautical Engineering State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology

Concept of duster banding heat source model is put forward for the problem of overmany increment steps in the process of numerical simulation of large welding structures, and expression of cluster banding heat source model is deduced based on energy conservation law. Because the expression of cluster banding heat source model deduced is suitable for random weld width, quantitative analysis of welding stress field for large welding structures which have regular welds can be made quickly.

关键词： cluster banding heat source numerical simulation welding residual stress

来源：评论

学校读者我要写书评

暂无评论

Theoretical study and numerical simulation of the stress fields of the Al_2O_3 joints brazed with composite filler materials

引用

China Welding 2006年第3期15卷 74-78页

作者：杨建国姬书得方洪渊 State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Institute of Astronautical Technology Shenyang Institute of Aeronautical Engineering

Non-linear finite element code MSC. Marc was utilized to analysis the field of stress of the Al2O3 joints brazed with composite filler materials. The properties of the filler materials were defined by using the mixing law, method of Mori-Tanaka and theory of Eshelby to ensure the accuracy and reliability of results of finite element method （FEM）. The results show stress in brazed beam is higher than that in base material. The maximal stress can be found in the interface of joint. And the experimental results show that the shear strength of joints increases from 93.75 MPa （ Al2O3p Ovol. % ） to 135.32 MPa （ Al2O3p 15vol. % ） when composition of titanium is 3wt% in the filler metal.

关键词： composite filler materials brazed joints finite element method residual stress

来源：评论

学校读者我要写书评

暂无评论

Powder injection molding of Fe-Ni soft magnetic alloys

引用

Rare Metals 2006年第z1期25卷 440-444页

作者： DUAN Bohua QU Xuanhui QIN Mingli GUO Shibo State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal UniversityNanchang 330013China

With miniaturization and complication of the shape of electronic devices in recent years,powder injection molding(PIM)seems to be a suitable process for fabricating the higher performance soft magnetic *** this paper,high quality Fe-50Ni soft magnetic alloy was fabricated by PIM with carbonyl iron and nickel,and the effect of sintering process on its microstructure and magnetic properties were *** mechanical and magnetic properties can be obviously improved by increasing the sintering temperature or using the hydrogen atmosphere instead of high vacuum,which causes by the increase of grain size and the *** the optimum sintering conditions,the PIM Fe-50Ni soft magnetic alloy with high properties are obtained,whose relative density,tensile strength,B_(m),H_(c),μ_(m)are 97%,465 MPa,1.52 T,16.62 A·m^(-1),42.5 mH·m^(-1),respectively.

关键词： powder injection molding soft magnetic alloy sintering

来源：评论

学校读者我要写书评

暂无评论

Cover Picture: Macromol. Mater. Eng. 6/2006

引用

Macromolecular Materials and engineering 2006年第6期291卷

作者： Huaiguo Tang Qing Qi Youping Wu Guihua Liang Liqun Zhang Jun Ma Beijing Institute of Aeronautical Materials Beijing 100029 China The Key Laboratory for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing 100029 China Centre for Advanced Materials Technology School of Aerospace Mechanical & Mechatronic Engineering The University of Sydney NSW 2006 Australia

Cover: The picture on the cover shows the reinforcement effect of starch on the mechanical properties and thermal property of styrene‐butadiene‐rubber. With mechanical strength comparable to carbon black, the reinforced rubber has the advantage of low dynamic heat rise and the renewable starch source. Further details can be found in the article by H. Tang, Q. Qi, Y. Wu, G. Liang, L. Zhang, * and J. Ma * on page 629.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Anti-thrombotic effect of amorphous hydrogenated carbon (a-C:H) films: influence of electron structure

Anti-thrombotic effect of amorphous hydrogenated carbon (a-C...

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： P. Yang G.J. Wan H. Sun Y.X. Leng N. Huang Y. Leng P.K. Chu Department of Physics and Materials Science City University of Hong Kong Kowloon Hong Kong China Key Laboratory of Surface Modifcation of Artijicial Organs Laboratory of Advanced Material Processing of Chinese Education Ministry Southwest Jiaotong University Chengdu China Department of Mechanical Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

Summary form only given. In this work, we focus on the relationship between the electron structure and wettability of amorphous hydrogenated carbon (a-C:H) and its blood compatibility. A series of films with different electron structure and wettability were fabricated using plasma immersion ion implantation-deposition (PIII-D), followed by annealing in vacuum between 200-600/spl deg/C. They were characterized by Raman, elastic recoil detection (ERD) and atomic force microscopy (AFM). The physical properties and surface characteristics of the films including the carrier concentration and mobility, resistivity and band gap were also examined. The thrombogenesis of the films was evaluated employing in vitro platelet adhesion tests. The results were correlated with the biological data to elucidate the blood compatibility mechanism of a-C:H films. The platelet adhesion and activation of a-C:H is affected by annealing. It is believed that the possible factors affecting blood compatibility are the adhesion energy of blood plasma, band gap, carrier type and concentration. Improving the electronic structure of a-C:H films is critical to the abatement of platelet activation.

关键词： Amorphous materials Electrons Blood Adhesives Plasma immersion ion implantation Annealing Atomic force microscopy Photonic band gap Plasma properties Conductivity

来源：评论

学校读者我要写书评

暂无评论

Operational systems, logistics engineering and technology insertion

引用

NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

来源：评论

学校读者我要写书评

暂无评论

Affordability, logistics R&D and fleet systems

引用

NAVAL ENGINEERS JOURNAL 1996年第3期108卷 199-213页

作者： Schulte, DP Skolnick, A He has supported the development and operation of several naval systems including advanced component selection for Trident II fire control and navigation systems. He served as branch manager of the Surface Ship ASW Combat System Branch which acted as the acquisition engineering agent for the AN/SQQ-89 Surface Ship Anti-Submarine Warfare Weapon System. He was then selected to manage the Module Engineering Department which provided engineering support to numerous naval systems including the AN/BSY-1 Submarine Combat System and the Trident II fire control and navigation system. He then served as the deputy program manager for NAVSEA Progressive Maintenance (2M/ATE). He holds a B.S. degree in Electrical Engineering from Purdue University and currently is pursuing a Maste's degree in Public Environmental Affairs at Indiana University—Purdue University Indianapolis. He served at Applied Physics Laboratory/The Johns Hopkins University in missile development then aboard USS Boston (CAG-1) and played leading roles in several weapon system developments (Regulus Terrier Tartar Talos) inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. He led the Navy's High Energy Lasers and Directed Energy Weapons development efforts. He was vice president advanced technology at Operations Research Inc. and vice president maritime engineering at Defense Group Inc. before starting SSC in 1991. Dr. Skolnick holds a B.S. degree in Mathematics and Economics Queens College an M.A. degree in Mathematics and Philosophy Columbia University an M.S. degree in Electrical/Aeronautical Engineering U.S. Naval Postgraduate School and a Ph.D. in Electrical Engineering and Applied Mathematics from Polytechnic University in New York. He is the author of many published papers on engineering design issues source selection procedures and large-scale complex technology problems

The Fleet continues to require high performance systems that can operate with dependability in the seas' unforgiving environments and under hostile action. Those demands are not new. What has changed is the urgent priority formerly assigned to national defense issues. The arguments for continued superpower military strength are now roiled in politics along with unsettled budgets and uncertain force level projections. Current expectations revolve about indefinite fiscal and operational issues (difficult funding constraints and broadband threats). In the actual event of ''doing more with less,'' a practical response is to apply the creative power available from sound engineering judgement and the crucible of experience to the immediate needs of the Fleet. The attempt to shorten the path between advanced development effort and Fleet use has been tried occasionally in the past, often, without exemplary results. The Sustainable Hardware and Affordable Readiness Practices (SHARP) program, is a generic R&D effort under OpNav sponsorship that has been working steadily on sensible solutions to product engineering problems. Armed today with fast-time, large-scale computation abilities and modern tools for technical problem solving coupled with specialized engineering knowledge, it has been refreshed and is underway satisfying existing Fleet needs. The relationship between fully responsive engineering services and current operational needs is always demanding. The connection between advanced engineering development (6.3 category funds) and immediate Fleet usage brings added complexity and challenge, both technical and organizational. Illustrative examples of affordable engineering solutions to ''retain, revise, replace or retire'' questions are presented within the context of both Fleet realities and budgetary limitations. The discussion covers legacy system support, civil/military considerations and Fleet maintenance issues. It describes the substantial and critical payoffs i

关键词： Warships

来源：评论

学校读者我要写书评

暂无评论

A CAPABLE, AFFORDABLE 21ST-CENTURY DESTROYER

引用

NAVAL ENGINEERS JOURNAL 1993年第3期105卷 213-223页

作者： LEVEDAHL, WJ The Author:is the assistant for technology in the Machinery Research and Development Dictorate of the Naval Surface Warfare Center Carderock Division Annapolis Md. After a 50-mission tour as a P-51 Mustang pilot he received a B.S. in general engineering from MIT and was elected to Sigma Xi. He subsequently studied gas turbines and aeronautical engineering at the Federal Polytechnic Institute in Zurich Switzerland and as a National Science Foundation fellow he received his Doktor Ingenieur at the Technical University of Aachen Germany. He conducted basic research in combustion at the National Bureau of Standards and was head of advanced core design at the Knolls Atomic Power Laboratory (General Electric) during the 1950s when the currently used reactor cores were designed. He then joined Combustion Engineering as chief project physicist in the design of central-station reactors. Subsequently he became manager of research at Martin Marietta involved largely in direct energy conversion for outer space. In 1970 he joined the Annapolis Laboratory to establish the Superconductive Electric Propulsion Program and in 1974 assumed his present position. He has received the Distinguished Flying Cross the Meritorious Civilian Service Award 10 patents and is the author of many technical papers.

A simple tumblehome hull of 4500LT lightship displacement carries 1200LT of military payload 6000NMi at 20kts with inherently-low acoustic, infrared, and radar signatures, and with superior seakeeping, without seawater ballast. Its two intercooled, recuperated turbines replace the seven simple-cycle engines of a comparably-armed conventional destroyer and consume 59% less fuel;both ships share a 30kt sustained speed at 80% power. Use of stern flaps permits carrving more fuel;range is doubled to 12,000 NMi. Two removable, prealigned and pretested steerable propulsor modules are attached to the stern after construction and are pierside replaceable without drydocking;each includes a steerable pod aligned to the water inflow. Contrarotating tractor propellers are driven by a pretested integrated capsule which comprises seals, thrust bearings, contrarotating ringring bicoupled epicyclic gears, and an alternating-current electric motor. A streamlined strut connects each pod rigidlv to a vertical steerable barrel which contains the individually-replaceable propulsor auxiliaries. Two power modules are removable and are mounted in the helicopter hangar. Each module comprises a 26,400 HP intercooled regenerated gas turbine, a 3 Mw ship-service generator, and a propulsion generator with a second high-voltage winding for electrothermal guns.

关键词：

来源：评论

学校读者我要写书评

暂无评论

REMOTE-SENSING OF surface SHIP WAKES

引用

NAVAL ENGINEERS JOURNAL 1992年第3期104卷 245-258页

作者： GRIFFIN, OM PELTZER, RD REED, AM BECK, RF Dr. Owen M. Griffin:is a senior research engineer in the Center for Advanced Space Sensing of the Naval Research Laboratory in Washington D.C. He received a B.S.M.E. degree in 1963 from the New Jersey Institute of Technology and an M.S.M.E. and a Ph.D. in mechanical engineering from the University of Notre Dame. Dr. Griffin has been employed at NRL since J 968. His areas of research interest are fluid dynamics naval hydrodynamics fluid/structure interactions and remote sensing. Dr. Rodney D. Peltzer:is a research engineer in the Center for Advanced Space Sensing at the Naval Research Laboratory. He graduated from the University of Rhode Island in 1978 with a B.S. in mechanical and ocean engineering and received his Ph.D. in aerospace and ocean engineering from Virginia Tech. Dr. Peltzer joined the staff of the Naval Research Laboratory in 1982. He is currently involved in research in the fields of ship wake hydrodynamics and remote sensing. Dr. Arthur M. Reed:is a staff naval architect in the Naval Hydrodynamics Division of the Ship Hydrodynamics Department of the David Taylor Research Center. In 1969 he received a B.S.E. in naval architecture and marine engineering and a B.S. in applied mathematics from the University of Michigan. He received an MS. and a Ph.D. in naval architecture and marine engineering also from Michigan. He joined the staff of David Taylor Research Center in 1974 and his research interests include wave resistance resistance and propulsion added resistance in waves advance surface ship propulsors and surface ship wakes. Dr. Robert F. Beck:is professor and chair of naval architecture and marine engineering at the University of Michigan. He has B.S.E. degrees from the University of Michigan in both naval architecture & marine engineering and aeronautical & astronautical engineering. He received a S.M. professional degree and a Ph.D. from MIT and joined the University of Michigan faculty in 1972 after a one year postdoctoral fellowship at the University of Adelaide. His primary inte

Recently, there has been much interest in the remote sensing of surface ship wakes using synthetic aperture radar (SAR). Ship wake signatures obtained using a SAR have several prominent features such as a dark trailing centerline region, bright-line images aligned at some angle to the ship's path, and sometimes the distinctive Kelvin ship wave pattern. The origins of these features are not well understood. Many different theories are available to explain one or more of the features. These theories are often in conflict and no difinitive answers are yet available. Much analytical and numerical research, and both laboratory and full-scale experiments are presently underway in order to develop proper explanations for these features. This paper first describes in some detail the distinctive features of SAR images. Then actual examples from early SEASAT SAR images, the JOWIP/Georgia Straight and SIR-B experiments, and the recent ONR remote sensing experiments are given. The observed radar image morphology includes dark centerline wake features, narrow-V bright line features, and Kelvin wave manifestations.

关键词： Flow of Fluids

来源：评论

学校读者我要写书评

暂无评论

RETROFITTING OF BULBOUS BOWS ON UNITED-STATES NAVY AUXILIARY AND AMPHIBIOUS WARSHIPS

引用

NAVAL ENGINEERS JOURNAL 1984年第6期96卷 40-51页

作者： CHUN, SK HOUGH, JJ ENGLE, AH FUNG, SC Stephen K. Chunis a graduate of the Maritime College of the State University of New York class of 1981 from which he received a B.E. degree in naval architecture and his license as a Third Assistant Engineer from the U.S. Coast Guard. Since graduation he has worked for the U.S. Navy as a naval architect with the Hull Form and Hydrodynamics Performance Division (SEA 55W3) of the Naval Sea Systems Command. Currently he is the task leader for hydrodynamic design for the DDG-51. He is also responsible for bulbous bow and appendage design for surf ace ships. Mr. Chun is a member of ASNE SNAME and ASE. Jeffrey J. Hough:is currently a naval architect with the Hull Form and Hydrodynamic Performance Division (SEA 55VV3) of the Naval Sea Systems Command (NA VSEA). In his current capacity he is a member of the Surface Ship Hydrodynamics Branch and is the divisional coordinator for computer supported design (CSD) technical director for the hull form design system (HFDS) Hull Engineering Group (SEA 55) assistant coordinator for CSD SEA 55 CSD coordinator for the DDG-51 contract design and SEA 55W3 project engineer for aircraft carrier/aviation support ship hydrodynamics. Mr. Hough received his B.S.E. degree in naval architecture and marine engineering in 1978 and his M.S.E. degree in naval architecture and marine engineering in 1979 from the University of Michigan. He began his career with the U.S. Navy in 1979 as an Engineer-in-Training in the Ship Design and Integration Directorate of NAVSEA. Prior to his current assignment Mr. Hough was the technical director responsible for the hull form and hydrodynamics energy conservation program and technical specialist for design practices for resistance and powering margins and hull form geometry. A member of ASNE since 1979 Mr. Hough is also a member of SNAME ASE and the U.S. Naval Institute. Allen H. Engleis a naval architect with the Hull Form Design and Performance Division of the Naval Sea Systems Command. He received his B.S. degree in engineering science from th

To meet energy conservation goals of the U.S. Navy, its attention has been focused on ways to reduce individual ship total resistance and powering requirements. One possible method of improving ship powering characteristics is by modifying existing individual ship hulls with the addition of bulbous bows. This paper will identify the merits of retrofitting bow bulbs on selected U.S. Navy auxiliary and amphibious warfare ships. A procedure for performing a cost-benefit analysis will be shown for candidate ship classes. An example of this technique for an amphibious warfare ship will also be provided. A brief discussion of future methods to be used for bulbous bow design such as application of systematic model test data and numerical hydrodynamic techniques will be given.

关键词： NAVAL VESSELS

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：