排序方式： 共有45条查询结果，搜索用时 187 毫秒
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表面物理与化学重点实验室拥有众多的青年科研人员,他们是决定实验室长远发展的关键因素之一.在传统激励机制效果弱化的情况下,应结合青年科研人员特点,树立以人为本的理念,通过有效构建和维护良好的心理契约,实现实验室青年科研人员的人本管理,从而激发和保持他们创新创造的激情. 相似文献
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本文就科技查新工作中存在的一些问题,建议性地提出具体解决方案,以提高我院查新质量。首先论述了我院的查新现状,然后,从人为因素和客观因素两大方面分析了影响我院查新工作质量的主要原因,其中,人为因素包括查新员自身业务素质、客户人为因素两方面,而客观因素则包括数据库资源、工作时间等因素。查新点是贯穿整个科技查新报告的生命线,查新点应该是体现该查新课题的核心内容;本文从两个具体的查新案例着手,描述了确定恰当的查新点分析过程。最后,真对我院查新工作所存在的问题,提出展望。 相似文献
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《Learning and Instruction》2007,17(4):394-404
In CSCL research, collaboration through chat has primarily been studied in dyadic settings. This article discusses three issues that emerged during the development of a multi-dimensional coding procedure for small-group chat communication: (a) the unit of analysis and unit fragmentation, (b) the reconstruction of the response structure and (c) determining reliability without overestimation. Threading, i.e. connections between analysis units, proved essential to handle unit fragmentation, to reconstruct the response structure and for reliability of coding. In addition, a risk for reliability overestimation was identified. Implications for analysis methodology in CSCL are discussed. 相似文献
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用MSC.Marc软件建立螺栓接头的三维接触有限元模型,计算得到了螺栓接头中螺纹段最大等效应力随预紧力的变化曲线、残余预紧力和螺纹段最大等效应力随被连接件所受轴向外力的非线性变化曲线,提出了基于这些曲线设计高强度螺栓接头预紧力和允许外力的方法。 相似文献
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The ratios of depth of penetration (DOP) of different targets under the same penetration condition was investigated according to the dimensionless formula of DOP of different targets penetrated by a non-deformable projectile.Results show that various targets may be equivalent to each other.The applicable range of the equivalence and the feasibility of targets substitution were discussed by integrating the available test data. 相似文献
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采用LS-DYNA3D动力有限元程序对钢球撞击双层带间隙保护板炸药柱的爆炸过程进行了数值模拟分析。分析中采用了流固耦合与动力学接触模式,获得了钢球撞击的临界起爆速度,爆炸产生的峰值压力。研究表明,采取适当的保护措施,炸药制成的部件或装置的安全性能够得到保证。 相似文献
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Conversion efficiency of soft X-ray from 0.35 μm pulse laser-irradiated aluminium planar target at laser intensities 1013–1015 W/cm2 on the Xingguang-II facility (laser energy 5–90 J, focal spot ⊃ Ф 200 μm full width of half maximun (FWHM) 400–800 ps) was measured. A simple model was given to explain soft X-ray conversion
efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower
irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity
around 2×1014 W/cm2, the X-ray conversion efficiency reaches a maximum.
Project suppoted by Shanghai Leading Academic Discipline Foundation (Grant No. T0104), and Science Foundation of Shanghai
Municipal Commission of Education (Grant No. 214680) 相似文献