A fully coupled (two-way), transient, thermal-mechanical finite-element procedure is developed to model conventional gas metal arc welding (GMAW) butt-joining process. Two-way thermal-mechanical coupling is achieved by making the mechanical material model of the workpiece and the weld temperaturedependent and by allowing the potential work of plastic deformation resulting from large thermal gradients to be dissipated in theform of heat.

关键词：钢铁；AISI1005；有限元模型；气体保护金属极弧焊；对接焊接；结构演化

查看摘要 索取原文[17页]

A new method of determination of C parameter of Larson-Miller equation was introduced.For 15CrMo steel,the optimal value of parameter C in the equation was derived.The reliability of the obtained results was analyzed.

关键词：钢铁；拉森米勒方程；15crmo钢；参数确定

查看摘要 索取原文[4页]

The corrosion failure analysis of an SA210 steel used in high pressure evaporator tube is conducted by XRD,SEM,OM.The result shows that the corrosion products in the inner wall of the steel tube is Fe3O4,mainly caused by the residual water in the evaporator tube corroding its inner wall with oxygen after the hydrostatic test of the boiler,finally leading to the corrosion leak of the tube.

关键词：钢铁；SA210钢管；高压蒸发器；气热回收锅炉；氧腐蚀

查看摘要 索取原文[5页]

This paper presents the design of an intelligent fire truck,which is based on the STC89C51 signal chip and realizes tracing,obstacle avoidance,alarm,putting out a fire and so on.The truck uses a model car chassis as a frame,STC89C51 as a microcontroller and including DC motor,flame detector,infrared tracing module with some other circuits.The truck has taken advantage of all the chips and the comprehensive performances in each part reasonably,and the intelligent fire truck can work very well.

关键词：汽车；消防车；STC89C51；跟踪；避障

查看摘要 索取原文[4页]

The self-balanced two-wheel Cars are often devised in various competitions,and are involved in this direction in many large games.Based on the Freescal Semiconductor XS128 series single-chip microcomputer as the core controller,with the gyroscope and angle sensor to achieve two-wheel Car self balance,the self-balanced two-wheel structure,the balance principle and the control algorithm are introduced emphatically,and the self-balanced two-wheel car is finally completed through repeated testing.

关键词：汽车；双轮自平衡车；单片机；XS128；控制算法

查看摘要 索取原文[5页]

We conducted a vehicle analysis to assess the feasibility of thermoelectric technology for waste heat recovery and conversion to useful electrical power and found that eliminating the 500 W of electrical power generated by the alternator corresponded to about a 7increase in fuel economy (FE) for a small car and about 6for a full size truck.We obtained critical vehicle level information for these driving cycles that enabled a highlevel design and performance analysis of radiator and exhaust gas thermoelectric subsystems for several potential vehicle platforms, and we identified the location and geometric envelopes of the radiator and exhaust gas thermoelectric subsystems.

关键词：汽车；热电转换；废热回收；尾气；燃料经济

查看摘要 索取原文[42页]

Ferritic stainless steels are promising candidates for IT-SOFC interconnect applications due to their low cost and resistance to oxidation at SOFC operating temperatures.To potentially extend interconnect lifetime and improve performance, a variety of surface treatments were performed on AISI 441 ferritic stainless steel coupons prior to application of a protective spinel coating.

关键词：钢铁；尖晶石；表面处理；不锈钢；互连材料；料电池

查看摘要 索取原文[13页]

This presentation describes the results of the demonstration of a non-flow-through PEM fuel cell as part of a power system on the SCARAB rover at the NASA Glenn Research Center. A 16-cell non-flow-through fuel cell stack from Infinity Fuel Cell and Hydrogen, Inc. was incorporated into a power system designed to act as a range extender by providing power to the SCARAB rover s hotel loads. The power system, including the non-flow-through fuel cell technology, successfully demonstrated its goal as a range extender by powering hotel loads on the SCARAB rover, making this demonstration the first to use the non-flow-through fuel cell technology on a mobile platform.

关键词：资源与环境；燃料电池；氢原子；负载（力）；利用技术

查看摘要 索取原文[26页]

The U.S. military is currently fitting amputees with state-of-the- art prosthetic devices. In addition to walking and changing direction on a variety of surfaces, amputees must be able to manage uneven terrain, crowded environments, stairs, ramps, and hills. The largest problem for a lower extremity amputee is falls. Among individuals with a lower extremity amputation, 52reported having fallen in the previous 12 months, 49reported being fearful of falling, and 65had low balance confidence scores. Falling history and balance confidence are associated with reduced mobility capability and social activity. As a result, lower extremity amputees with limited balance and stability are at risk for diminished quality of life. The goal of this research effort is to rehabilitate lower extremity amputees to reduce falls using a novel training method. In this first year of the research effort, we have developed a novel experimental method to induce unexpected trips to amputees under controlled laboratory conditions. We have identified objective biomechanical variables that are causally related to the success or failure in avoiding a fall after a trip, objective tests to quantify functional outcomes, and a subject-specific questionnaire to determine if the training method is effective. Enrollment has begun. Our target is to deliver a quantitatively derived, deployment-ready, advanced gait rehabilitation system that can improve functional outcomes and/or shorten the time required for injured servicemen and women to return to active duty or to a productive civilian life.

关键词：医药；康复技术；截肢；复健；军事人员

查看摘要 索取原文[6页]

The overall aim is to conduct preliminary evaluations of new rehabilitation strategies and new functional assessment methods for homonymous hemianopia (HH) and spatial neglect (SN), disabling visual and cognitive perception conditions that commonly occur as a result of severe traumatic brain injury (TBI) and stroke. Both HH and SN prevent detection of objects on the affected side, resulting in unsafe walking and driving. Using realistic tasks in virtual environments representative of everyday mobility challenges we are evaluating a novel optical device expansion prism (EP) glasses - combined with a new computerized perceptual-motor training regimen in helping people with HH and SN detect and avoid obstacles on the affected side. In the first year we have made good progress in developing the training software and preparing the functional assessments, and have started recruitment. Specifically, we (1) obtained all necessary IRB approvals; (2) made excellent progress in developing and testing the training program and training task suite; (3) made excellent progress in preparing the functional assessments in the driving simulator and virtual mall that will be used to evaluate performance without and without the prism glasses before and after training; (4) evaluated mobile eye tracking technologies that will be used for an outdoor walking task; (5) began recruitment; (6) collected pre-pilot data from participants who did not meet the study criteria, and (7) enrolled 3 participants for the main pilot study. Results from the first participant who has completed the protocol are promising showing significantly improved detection rates and collision judgments with the EP-glasses after training.

关键词：医药；康复技术；创伤性脑损伤；功能恢复训练；损伤评估

查看摘要 索取原文[12页]