浅谈“无板起跳”训练法对提高业余跳远运动员助跑速度利用率的作用

在跳远技术教学训练中,阶段性采用取消跳板跳远的训练方法,消除运动员起跳前减速上板起跳的错误条件反射,提高速度利用率,从而最大限度地提高跳远成绩。     

Triphasic vascular effects of thiol compounds and their oxidized forms on dog coronary arteries

The vascular effects of 2-mercaptoethanol, cysteamine, L-cysteine, glutathione (GSH), cystamine and oxidized GSH (GSSG) on the isometric tension of isolated dog coronary arterial strips were examined, and these effects were compared with the triphasic response induced by dithiothreitol (DTT); a rapid and weak contraction (phase A), an intervening slow relaxation (phase B) and a slowly-developing strong contraction (phase C) which we previously reported. The responses of the arteries induced by 2-mercaptoethanol, cysteamine and L-cysteine consisted of phases A, B and C. The order of contractile potency (ED₅₀ of phase C) was DTTL-cysteine>2-mercaptoethanolcysteamine, while the order of relaxant potency (ED₅₀ of phase B) was DTT>cysteamine2-mercaptoethanol. GSSG and cystamine mainly produced relaxation, which corresponded to phase B. The phase C contraction was specific to the reduced forms of thiols, except for GSH, which produced only relaxation. The participation of endothelial cells was not essential for the contracting or relaxing effects of the thiol compounds. The phase C contraction was depressed by W-7, a calmodulin antagonist, while phase A was not. Therefore calmodulin-dependent protein kinases may participate in phase C, not in phase A.     

应用重心原理改进单纯形法的搜索方向

对多元无约束最优化单纯形法提出新的改进,反射点、延伸点及收缩点在沿通过“重心”的线上被寻找。给出了新方法的具体计算步骤。算例结果表明,该方法优于中心法。     

Linux设备驱动开发方法及应用实例

介绍了基于LKM(linuxkernelmodel)的Linux设备驱动开发方法,完成了THIPC-7462测控模板的驱动程序,并讲述了其在THMR-V视觉临场感遥控系统上的具体应用.     

教师要树立科学的学生观

学生观是教师对学生所持的基本认识,是教师教育观念的核心要素。教师的学生观来自理论和实践,不同的学生观对学生的发展影响不同。树立科学的学生观,是正确处理师生关系的基础,是实现教育创新的突破口。     

多通道微位移报警装置

介绍了以89C52为核心的多通道微位移报警装置的整体结构、工作原理及检测系统的软硬件设计．微处理器实时检测多路传感器的位移值，超过设定的值时系统进行报警，并通过通信接口将检测数据上传至计算机，同时利用计算机的多媒体优势进行报警．实际运行结果表明：该系统稳定性好，精确度高，达到了预期的性能指标要求．     

圆纬机电子选针器下位机控制系统的研究与实践

本文以PC104为上位机，89C51单片机为下位机的主从两级控制系统的电子选针硬软件设计。重点阐述了下位机存储管理程序和电子选针过程的数据读取程序的设计。系统经调试运行满足圆纬机电子选针的要求，实现了多路电子选针的目的。     

《庄子》文学观探源

“人”、“物”、“道”标示了庄子哲学观的生存论、生态论、宇宙论三个环节，“人与文”、“物与文”、“道与文”是庄子从其哲学观出发，审视并揭示文学起源的三重维度。与此相应，庄子形成了其独具特色的生存论、生态论及宇宙论的文学观。从生存论出发，文学是对生存的诗性观照，是真人自由生命的映射；从生态论出发，文学是对物性的体认及回归；从宇宙论出发，文学是对宇宙情怀的书写，是向大道的归藏，是天与心的交融。在文学的三维书写中，庄子揭示了文学的本质就是见证生命的自由。     

开放性尘源粉尘运动轨迹的数值计算

在对粉尘颗粒在大气中受力状况进行分析的基础上 ,采用颗粒随机轨道模型对尘源表面的粉尘在大气中的运动轨迹进行了数值计算 ,再现了野外现场观测的现象 ,从而证明了数值计算的可靠性 .利用ParticleSourceinCell算法 ,计算了由开放性粉尘造成的大气含尘质量分数 ,为定量预测露天矿粉堆料对环境造成的污染提供了依据 .     

Dielectric and Structural Properties of SrTiO_3 Thin Films Grown by Laser Molecular Beam Epitaxy

Dielectric and Structural Properties of SrTiO_3 Thin Films Grown by Laser Molecular Beam Epitaxy[1]Hao J H,Gao J,Wang Z,et al.Interface structure and phase of epitaxial SrTi O3(110)thin fil ms grown directly on silicon[J].Appl Phys Lett,2005,87:131908. [2]Hao J H,Gao J,Wang HK.SrTi O3(110)thin fil ms grown directly on different oriented silicon substrates[J].Appl Phys A,2005,81:1233. [3]Aki mov I A,Sirenko A A,Clark A M,et al.Electric-field-induced soft-mode hardening in SrTi O3fil ms[J].Phys Rev Lett...