共查询到20条相似文献,搜索用时 826 毫秒
1.
2.
程晋宽 《机械工业高教研究》2007,(4):28-30
隐喻是对现实的观念表达,在大学成为“超级市场”后,大学管理面临着一些新挑战。随着大学管理观念的转变,政府要加强对大学的管理权力,大学管理要民主化和科学化,建立咨询和协调机构,服务教育顾客。 相似文献
3.
The existence of thermocline changes the acoustic structure and effects the direction of the sound rays.This paper analyzes the working process of the active sonar,and the mathematical models.The detection probability of the active sonar under thermocline is studied.First,the detection distance without thermocline is estimat-ed,then the effect of thermocline's depth and sound velocity changes on detecting submarine probability are discussed,and based an this,the effects of the sea condition on searching submarine probability is discussed,lastly the distance of active sonar is calculated under ther-mocline. The results indicate that under thermocline,the distance of the active sonar becomes obvious short,and with the sea condition becoming rough,the effect is more clear. 相似文献
4.
5.
模拟电子技术网上教学中的动画制作 总被引:1,自引:0,他引:1
Macromedia Flash MX是一款多媒体动画制作软件.目前,Flash已成为一种网上二维动画事实标准.在教学领域中,多媒体教学的介入,更是以其丰富的内容、生动的画面、巧妙的链接组合、多采的演示效果,激发了学生的求知热情.如果与Internet相连,则可以轻易将Flash MX教学课件上传,不但便于网上的教学,还便于学术的交流.在模拟电子教学中,应用Flash MX制作的多媒体教学课件,不仅可以激发学生的求知热情,而且还可以使在传统教学中学生不易理解的内容,通过Flash MX教学课件对其有一个感性认识.文中介绍了Flash MX教学课件的制作方法. 相似文献
6.
柴油机三大偶件是整个系统的关键部件,磨损之后严重影响柴油机的工作性能。通过实验,分别测量三大偶件磨损后柴油机的供油量和供油压力波形,并对三大偶件对柴油机的供油量和供油压力的影响作了定性分析,为柴油机燃油系统的故障诊断提供了一个可靠的方法和依据。 相似文献
7.
花键轴齿形成形中齿根开裂的研究 总被引:1,自引:0,他引:1
应用有限元分析软件,对花键轴的齿形成形过程进行模拟.通过研究应力分布,证实齿根开裂现象的发生,找到齿根开裂的原因.通过分析断裂因子的分布和变化,预测可能发生开裂的位置.结合六齿矩形花键轴实际成形情况进行模拟计算,获得了入模半锥角的较佳取值范围. 相似文献
8.
9.
傅立叶变换近红外分析汽油辛烷值模型优化研究 总被引:2,自引:0,他引:2
利用傅立叶变换红外谱仪进行汽油样品辛烷值(RON)测定,采用仪器配备的软件进行模型优化,使用11种光谱预处理方法和不同的谱区组合,计算机自动处理优化过程并评价优化数据,50个汽油样品优化后得到最佳结果,光谱预处理方法为一阶导数,谱区范围为6100.4-4999.1cm^-1。得到的内部交互验证相关系数R2=99.05%和均方差RMSECV=0.167,优化后的结果说明,该方法完全能满足测试误差要求,从而为近红外模型优化提供参考。 相似文献
10.
The forward radiation shielding of the CMS detector is developed for the LHC by the Institute for High-Energy Physics. The efficiency of this shielding is analyzed on the basis of the results of numerical simulation. The computed particle-flux densities are compared to those of the ideal model of the shielding. The secondary-radiation field near the detector is investigated with different configurations of the shielding. Measures for reinforcing the shielding of the detector's experimental zone are proposed. The possibilities of improving the shielding structure and the composition of its materials are discussed. 相似文献
11.
瞿军晖说,“主机企业尤其是龙头主机企业本身已拥有特定的品牌形象,正因此,其在进行二手业务开拓时就存在一定的品牌主观性和局限性,不具备第三方平台所拥有的公信力。第三方平台的诞生为主机企业和用户构建了一个实现共赢的合作空间。” 相似文献
12.
13.
我国的民营企业发展到今天这个地步,已是经过市场大浪的淘洗,存者能够经历风吹浪打,败者已随潮流而退,民营科技型企业则是一支生力军,成为推动科技进步和促进社会主义市场经济发展的一支重要力量。分析了民营企业的现状、企业家的现状、企业管理、企业文化等,为新介入衡器行业的民营企业的发展提供了一个参考的模式,以促进其整体素质的提升。 相似文献
14.
JT-6-19推焦车在推焦杆推焦进退过程中,出现不同程度的震动.分析推焦杆推焦中的各种因素及受力情况,找出主要因素,减小水平度公差,减小震动. 相似文献
15.
在土地开发整理项目管理中,四川省苍溪县财政局充分发挥财政投资管理职能,狠抓土地开发整理项目资金及财务管理,提高了土地开发整理项目资金的最大效益,保证了土地开发整理项目健康、有序地运行. 相似文献
16.
17.
18.
19.
20.
The periodicity of the physiological flow has been the major interest of analytic research in this field up to now. Among
the mechanical forces stimulating the biochemical reaction of endothelial cells on the wall, the wall shear stresses show
the strongest effect to the biochemical product. The objective of present study is to find the effects of velocity waveform
on the wall shear stresses and pressure distribution along the artery and to present some correlation of the velocity waveform
with the clinical observations. In order to investigate the complex flow phenomena in the bifurcated tube, constitutive equations,
which are suitable to describe the rheological properties of the non-Newtonian fluids, are determined, and pulsatile momemtum
equations are solved by the finite volume prediction. The results show that pressure and wall shear stresses are related to
the velocity waveform of the physiological flow and the blood viscosity. And the variational tendency of the wall shear stresses
along the flow direction is very similar to the applied sinusoidal and physiological velocity waveforms, but the stress values
are quite different depending on the local region. Under the sinusoidal velocity waveform, a Newtonian fluid and blood show
big differences in velocity, pressure, and wall shear stress as a function of time, but the differences under the physiological
velocity waveform are negligibly small. 相似文献