为解决传统模块化生产系统(Modular Production System,MPS)教学实验设备投入费用高、可拆装性差、实验时间受限等问题,本研究以UG软件为建模工具,基于MakeReal3D平台设计并开发了MPS虚拟仿真实验系统。该系统具有设备认知、模块化系统...为解决传统模块化生产系统(Modular Production System,MPS)教学实验设备投入费用高、可拆装性差、实验时间受限等问题,本研究以UG软件为建模工具,基于MakeReal3D平台设计并开发了MPS虚拟仿真实验系统。该系统具有设备认知、模块化系统搭建、虚拟拆装、生产工艺仿真等多种功能,完整再现MPS实验过程。MPS虚拟仿真实验系统3D沉浸式的交互模式,激发了学生的学习兴趣,加强了学生对专业知识的理解,培养了学生的动手能力和实践能力。展开更多
The installation of plunger-type wave makers in experimental tanks will generally include a gap between the back of the wedge and the wall of the tank.In this study,we analyze the influence of this gap on the wave mak...The installation of plunger-type wave makers in experimental tanks will generally include a gap between the back of the wedge and the wall of the tank.In this study,we analyze the influence of this gap on the wave making performance of the plunger using two-dimensional(2 D)CFD calculations for a range of nearly linear wave conditions and compare the results with both experimental measurements and linear potential flow theory.Three wedge-shaped profiles,all with the same submerged volume,are considered.Moreover,the generated waves are compared with the predictions of linear potential flow theory.The calculations are made using the commercial ANSYS FLUENT finite-volume code with dynamic meshes to solve the Navier-Stokes equations and the volume of fluid scheme to capture the air-water interface.Furthermore,the linear potential flow solution of Wu(J Hydraul Res 26:481-493,1988)is extended to consider an arbitrary profile and serve as a reference solution.The amplitude ratios of the generated waves predicted by the CFD calculations compare well with the predictions of linear potential flow theory for a simple wedge,indicating that viscous effects do not influence this ratio for small-amplitude motions in 2 D.By contrast,significant higher harmonic components are produced by larger amplitude motions.Also,the simple wedge is found to produce the smallest spurious higher harmonic content in the far-field wave.展开更多
Curriculum design is an aspect of education profession which focuses on developing curricula for students.Educators will take many factors in consideration when design a curriculum.In practical teaching,teacher as dec...Curriculum design is an aspect of education profession which focuses on developing curricula for students.Educators will take many factors in consideration when design a curriculum.In practical teaching,teacher as decision makers to design an appropriate curricu lum and teaching activities play an important part in the whole teaching and learning.Many classroom teachers are working with students of different levels of ability,and they need to be able to adjust the curriculum to keep all of the students engaged and learning.It may also be necessary to change the pace of a curriculum to deal with problems as they arise.The essay analyse five parts in designing the curriculum as a teacher decision maker and get a conclusion according to the whole analysis course.展开更多
“Client/Server数据库”一词很容易使人联想到那种大量重任在肩的用户使用的、高性能的关系数据库产品。这种想法也许要改变了。现在,Claris公司向FileMaker Pro的用户提供了一种更为轻松的Client/Server计算模式:一种便于使用的、非...“Client/Server数据库”一词很容易使人联想到那种大量重任在肩的用户使用的、高性能的关系数据库产品。这种想法也许要改变了。现在,Claris公司向FileMaker Pro的用户提供了一种更为轻松的Client/Server计算模式:一种便于使用的、非关系型数据库产品FileMaker Pro 3.0Server for Windows NT。 FileMaker Pro 3.0 Server软件来自于目前正在使用的Macintosh版本,可运行于Windows NT 3.51或更新的版本上。与Macintosh版本相同,它扩展了FileMaker Pro对多用户的支持能力:支持最多100个并发用户和最多可打开100个文件。展开更多
文摘为解决传统模块化生产系统(Modular Production System,MPS)教学实验设备投入费用高、可拆装性差、实验时间受限等问题,本研究以UG软件为建模工具,基于MakeReal3D平台设计并开发了MPS虚拟仿真实验系统。该系统具有设备认知、模块化系统搭建、虚拟拆装、生产工艺仿真等多种功能,完整再现MPS实验过程。MPS虚拟仿真实验系统3D沉浸式的交互模式,激发了学生的学习兴趣,加强了学生对专业知识的理解,培养了学生的动手能力和实践能力。
文摘The installation of plunger-type wave makers in experimental tanks will generally include a gap between the back of the wedge and the wall of the tank.In this study,we analyze the influence of this gap on the wave making performance of the plunger using two-dimensional(2 D)CFD calculations for a range of nearly linear wave conditions and compare the results with both experimental measurements and linear potential flow theory.Three wedge-shaped profiles,all with the same submerged volume,are considered.Moreover,the generated waves are compared with the predictions of linear potential flow theory.The calculations are made using the commercial ANSYS FLUENT finite-volume code with dynamic meshes to solve the Navier-Stokes equations and the volume of fluid scheme to capture the air-water interface.Furthermore,the linear potential flow solution of Wu(J Hydraul Res 26:481-493,1988)is extended to consider an arbitrary profile and serve as a reference solution.The amplitude ratios of the generated waves predicted by the CFD calculations compare well with the predictions of linear potential flow theory for a simple wedge,indicating that viscous effects do not influence this ratio for small-amplitude motions in 2 D.By contrast,significant higher harmonic components are produced by larger amplitude motions.Also,the simple wedge is found to produce the smallest spurious higher harmonic content in the far-field wave.
文摘Curriculum design is an aspect of education profession which focuses on developing curricula for students.Educators will take many factors in consideration when design a curriculum.In practical teaching,teacher as decision makers to design an appropriate curricu lum and teaching activities play an important part in the whole teaching and learning.Many classroom teachers are working with students of different levels of ability,and they need to be able to adjust the curriculum to keep all of the students engaged and learning.It may also be necessary to change the pace of a curriculum to deal with problems as they arise.The essay analyse five parts in designing the curriculum as a teacher decision maker and get a conclusion according to the whole analysis course.
文摘“Client/Server数据库”一词很容易使人联想到那种大量重任在肩的用户使用的、高性能的关系数据库产品。这种想法也许要改变了。现在,Claris公司向FileMaker Pro的用户提供了一种更为轻松的Client/Server计算模式:一种便于使用的、非关系型数据库产品FileMaker Pro 3.0Server for Windows NT。 FileMaker Pro 3.0 Server软件来自于目前正在使用的Macintosh版本,可运行于Windows NT 3.51或更新的版本上。与Macintosh版本相同,它扩展了FileMaker Pro对多用户的支持能力:支持最多100个并发用户和最多可打开100个文件。
文摘传奇摇滚偶像Joan Jett成为史上首位参与Gibson电子吉他签名款设计制作的女音乐人、世界顶级乐器制造商和乐器制作工艺的领先者Gibson吉他近日发布了一款与传奇摇滚乐手Joan Jett共同设计与创作的签名吉他-Joan Jett Signature Melody Maker。此款吉他是对Jett此前在《I Love Rock N’RoⅡ》以及《Do You Wanna Touch Me》等单曲中所使用演奏的Melody Maker的致敬。同时,也标志着Gibson电子吉他签名款首次与一位女性音乐人的成功合作。
