TA15钛合金钨极氩弧焊焊接接头损伤容限性能研究     

WANG Li-fa  LIU Jian-zhong  KANG Qing-yun 《实验室研究与探索》2007,(10)

为了分析研究焊缝、热影响区、母材的损伤容限性能差异,对TA15钨极氩弧焊焊缝、热影响区和焊接母材分别进行了断裂韧度试验和疲劳裂纹扩展速率试验,试验结果表明:焊缝、热影响区、焊接母材的断裂韧度值差别不大;三个应力比下(R=0.5,0.06,-1)氩弧焊热影响区裂纹扩展速率均较母材及焊缝的稍高,这种现象在正应力比下的低速扩展区更明显些;焊缝裂纹扩展速率一般稍低于母材。  相似文献   

明代法政体制述论   总被引：2，自引：0，他引：2  

刘长江 《四川师范大学学报(社会科学版)》2005,32(6):109-114

中国封建法政体制至明代臻于完善。明朝中央司法机关正式以三法司相称，司法审判中，实行刑部审理、大理寺复核、都察院监督的三法司会审制度。这实质上是一种权力的制约，旨在防止刑部独揽审判权。而在实际运作过程中，司法权受到皇权、后妃勋戚及行政长官等的掣肘，尤其是明中后期厂卫的干扰，致使法政体制遭到严重破坏，导致“明代大案多枉”。  相似文献   

浅议侵犯商业秘密罪的罪过形式   总被引：2，自引：0，他引：2  

黄磊 《和田师范专科学校学报》2005,25(2):41-42

本文从商业秘密的特殊性出发，针对学界关于侵犯商业秘密罪的罪过形式的不同理解，认为过失也是侵犯商业秘密罪的一种罪过形式，同时提出自己的建议。  相似文献   

校企联合,共建电子商务实验中心模式探讨     

熊小江 《闽西职业技术学院学报》2004,6(4):69-71

为培养优秀的电子商务专业应用型人才,在电子商务专业中广泛加强实践教学显得十分重要,我们应该构建校内模拟实验室以及校外实验基地的电子商务实验中心;通过校企联合共建电子商务实验中心,达到资源共享、优势互补,充分发挥校企各自的核心竞争力,走共赢之路。  相似文献   

利用Marthematica软件改善高等数学教学效果的实践   总被引：1，自引：0，他引：1  

刘雄伟  李建平  胡小荣 《中国教育技术装备》2007,(4):17-19

现代化的教育理念、教育手段和教学素材对传统的高等数学教学产生了深刻影响,我们在新编的学历教育合训教材中尝试将高等数学教学内容、数学建模的思想和方法以及Mathematica软件进行有机的整合。本文介绍了如何充分利用Mathematica软件来激发学生的学习兴趣、改普教学效果的一些具体做法。实践证明,在Mathe- matica软件支持下,可以大大提高高等数学教学质量。  相似文献   

现浇楼梯施工缝预留及支模工法     

刘春雷  张素琴 《石家庄铁路职业技术学院学报》2006,5(3):73-76

介绍现浇楼梯施工缝预留及支模工法的特点、适用范围、工艺原理及施工工艺流程。  相似文献   

膝关节转动速度及其与短跑速度的相关分析     

申伟华  唐京武 《湘潭师范学院学报(社会科学版)》1989,(6)

本文采用光电记时法对人体膝关节转动速度进行测定,并在此基础上对膝关节转动速度与短跑速度进行了相关分好。研究结果表明:(l)、两膝关节转动速度存在着明著的差异(p<0.01),(2)、膝关节转动速度在男女之间存在着明显的差异(p<0.01),(3)、膝关节转动速度与短跑速度存在着相关关系(r=-0.341—-5.38,p<0.01)。  相似文献   

Kinetics of throwing arm joints and the trunk motion during an overarm distance throw by skilled Japanese elementary school boys     

Yasuto Kobayashi  Michiyoshi Ae  Akiyo Miyazaki  Norihisa Fujii  Akira Iiboshi  Hideki Nakatani 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(3):314-328

The purpose of this study was to investigate joint kinetics of the throwing arms and role of trunk motion in skilled elementary school boys during an overarm distance throw. Throwing motions of 42 boys from second, fourth, and sixth grade were videotaped with three high-speed cameras operating at 300 fps. Seven skilled boys from each grade were selected on the basis of throwing distance for three-dimensional kinetic analysis. Joint forces, torques, and torque powers of the throwing arm joints were calculated from reconstructed three-dimensional coordinate data smoothed at cut-off frequencies of 10.5–15 Hz and by the inverse dynamics method. Throwing distance and ball velocity significantly increased with school grade. The angular velocity of elbow extension before ball release increased with school grade, although no significant increase between the grades was observed in peak extension torque of elbow joint. The joint torque power of shoulder internal/external rotation tended to increase with school grade. When teaching the overarm throw, elementary school teachers should observe large backward twisting of trunk during the striding phase and should keep in mind that young children, such as second graders (age 8 years), will be unable to effectively utilise shoulder external/internal rotation during the throwing phase.  相似文献   

The effect of translational and rotational traction on lower extremity joint loading     

John W. Wannop  Darren J. Stefanyshyn 《Journal of sports sciences》2016,34(7):613-620

Previous studies have linked footwear traction to lower extremity non-contact injury; however, these studies mainly focussed on rotational traction exclusively. While studies have shown that increases in traction lead to increases in joint loading, represented by joint moments, these studies failed to determine how the individual components of rotational and translational traction affect joint loading. Therefore, this study investigated how each component of traction independently affects lower extremity joint loading. Traction testing was performed using a robotic testing machine on three shoes that had independent alterations of translational and rotational traction. All testing was conducted on a sample piece of artificial turf. Kinematic and kinetic data were then collected on 10 athletes performing two cutting movements in each shoe condition. As rotational and translational traction were independently altered, decreased rotational traction led to significant decreases in transverse and frontal plane joint loading at the ankle and knee joints, while increases in translational traction led to increases in frontal plane joint loading at the ankle and knee joints. Increases in joint loading in the transverse and frontal planes are one of the possible mechanisms of lower extremity non-contact injury. Both translational and rotational traction can independently alter the joint loading.  相似文献   

坚持走联合办学之路，实现学校跨越式发展     

田象生 《鸡西大学学报》2002,2(3):7-7,23

高职高专院校要办出特色，办出质量，实现跨越式发展，就必须坚持走联合办学之路，充分调动企事业单位，部门参与办学的积极性，建立稳定的联合办学关系，实现办学双方的共同发展。  相似文献