基于Solid Edge软件的虚拟装配及运动仿真

介绍了Solid Edge软件装配模块的主要功能，以油泵主要部件为对象进行虚拟装配设计，并进行了干涉检查，实现了运动仿真。     

RTOS在数字化焊接电源中的应用前景

定义了嵌入式操作系统，分析了在数字化焊接电源中采用RTOS(Real Time Operating System)的必要性。结合焊接电源的特点，阐述了在数字化焊接电源的开发中引入RTOS的优点，探讨了数字化焊接电源开发中应用RTOS的可行性。分析表明，RTOS在数字化焊接电源中具有广阔的应用前景。     

LaNi4.5Al0.5储氢合金固溶相的密度泛函研究

基于密度泛函理论,采用全势线性缀加平面波方法（FLAPW）,研究LaNi4.5Al0.5储氢合金固溶相α-LaNi4.5Al0.5H0.5和α-LaNi4.5Al0.5H1.0中H原子的占位、态密度和电子密度,分析了H原子的加入对固溶体电子结构和稳定性的影响。结果表明：从能量角度计算得到α-LaNi4.5Al0.5H0.5中H原子最可能占据靠近Al的6m位,α-LaNi4.5Al0.5H1.0中的两个H原子最可能占据6m和4h＊位;随着H原子的增加,晶胞主要沿着c轴方向膨胀;Al和Ni,H之间的相互作用是合金含氢固溶体保持稳定的主要因素;态密度图中低能量区域的态密度越大固溶体越稳定;如果EF处于带隙的底部,则体系较稳定。计算结果与已有的实验结果非常一致。     

New attachment for controlling gas flow in the HVOF process

During the decade, the high-velocity oxyfuel (HVOF) process proved to be a technological alternative to the many conventional thermal spray processes. It would be very advantageous to design a nozzle that provides improved performance in the areas of deposition efficiency, particle in-flight oxidation, and flexibility to allow deposition of ceramic coatings. Based on a numerical analysis, a new attachment to a standard HVOF torch was modeled, designed, tested, and used to produce thermal spray coatings according to the industrial needs mentioned above. Performance of the attachment was investigated by spraying several coating materials including metal and ceramic powders. Particle conditions and spatial distribution, as well as gas phase composition, corresponding to the new attachment and the standard HVOF gun, were compared. The attachment provides better particle spatial distribution, combined with higher particle velocity and temperature. The original version of this article was published as part of the ASM Proceedings, Thermal Spray 2003: Advancing the Science and Applying the Technology, International Thermal Spray Conference (Orlando, FL), 5–8 May, 2003, Basil R. Marple and Christian Moreau, Ed., ASM International, 2003.     

基于虚拟技术的超声检测培训系统

利用虚拟技术构建虚拟超声检测培训系统VUTS,对其功能、结构和实现方法进行了介绍。在VUTS界面上,鼠标即超声仪按钮和探头,具有强大的交互性和可视化,为直接在计算机上培训超声检测人员提供了手段。     

空气弹簧系统的计算机虚拟设计

随着计算机科学的迅猛发展和工程力学有限元分析理论的不断成熟,空气弹簧的设计和开发由早期主要依靠试验和实际运用中得到的数据来改进转向了计算机虚拟设计与试验相结合的渠道上来.本文运用CAD软件建立了空气弹簧系统的三维立体模型,通过有限元分析,建立了空气弹簧系统的有限元模型,并进行了垂向力学特性分析,其结果与试验结果相一致,为空气弹簧的设计和制造提供了有益的参考.     

基于MATLAB的手臂康复机器人仿真研究

手臂康复机器人通过牵引患肢按规定轨迹运动,以锻炼肌肉、恢复运动功能,实现手臂康复训练.该机器人采用极坐标形式,由电机驱动各关节协调控制实现手臂的平面运动,该机器人可以在水平面和垂直面进行手臂运动锻炼.建立了基于MATLAB的手臂康复机器人控制模型,基于虚拟现实技术进行了仿真,仿真结果说明系统达到了预期效果.     

中国植物空间分异规律

以省级行政区为分析单元,借助ArcGIS空间分析功能对中国行政分区图、中国森林覆盖率图、中国植物区系图、中国植被分区图进行叠加分析。通过对同一植被分区下分析单元数据进行整合,给出全国不同植物区系、植被分区、森林覆盖率信息。采用二阶聚类综合判别法,提取中国植被分区总体信息,探求植被空间分异规律,发现一类、二类、三类植被的比例为30∶37∶23,反映出植被的区域分布特性较强;四类植被比例大致占10%,反映出大区域内部的局地小生境造成的植被分布的整体差异。另外,一类植被多分布在中高纬度地带,二类植被贯穿中国全纬度,三类植被多分布在低纬度地带。     

A Comparison of learning gains when using a 2D simulation tool versus a 3D virtual world: An experiment to find the right representation involving the Marginal Value Theorem

The use of three-dimensional Virtual Worlds in the classroom offers the promise of engaging and authentic learning experiences. Given the effort and investment involved in the creation of these worlds, more studies are needed which measure the learning gains. In particular, greater understanding is needed concerning what aspects of the technology are beneficial for learning what sort of content and in what context. We conducted two experimental studies involving 129 biology students over a two-year period that sought to make a contribution towards this understanding. Our study compared the knowledge of students after a traditional classroom lecture about a biological theorem known as Marginal Value Theorem, with their knowledge after they were exposed to simulations of two-dimensional models developed in NetLogo and three-dimensional models developed in Unity3D. Perhaps due to cognitive overload and distractors in the virtual world, it appears that the two-dimensional NetLogo model delivered better learning outcomes.