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Abstract: A novel strip-coil-baffle structure used to enhance heat transfer and support the tube bundle for a tube-shell heat exchanger is proposed.The new structure can sleeve the tubes in bundle alternatively to create a vortex flow in a heat exchanger.
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文摘:介绍了一种用于强化管壳式换热器壳侧传热和支撑管束的螺旋折流片新型结构,该结构是对换热器管子相间地套上螺旋折流片以产生旋涡流动.研究模型是在正方形布置的4个管子中的2个对角管子套上螺旋折流片后形成的通道,利用FLUENT软件对该上述四管通道模型的流场和温度分布情况进行了数值模拟;分析了四管通道模型中螺旋折流片对强化传热和流动阻力随雷诺数的变化关系的影响.算例结果显示该新型结构可比相同尺寸的光管通道中的情形传热系数提高约40﹪～55﹪,同时也将伴随较高的流动阻力.可以相信螺旋折流片式换热器将会在许多工业 |
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Abstract: A number of different approaches have been used to assess bioavailability of Zinc in the feedstuff.The article introduced the basic princiles concerned in the present study,together with an indication of their major advantages or disadvantages.T
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文摘:本文扼要地介绍了目前评定饲料锌生物利用率的方法的基本原理以及这些评定方法的优缺点，并总结了使用不同方法所得出的评定结果，以供畜牧工作者参考。 |
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Abstract: A numerical model which can evaluate the movement of each individual occupant is developed,the model which divides a building setting into planar grids can described the position of each occupant at any point of time.The movement speed and direc
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文摘:将建筑物在平面上划分成能反映人员具体位置的几何坐标网格，根据不同人员在不同网格内的移动特性确定其移动速度，建立了描述人员疏散过程的数学模型，用场模拟的方法可以准确得到建筑物疏散时间和人员疏散轨迹，其仿真结果与国外同类软件对比具有较好的精度。 |
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Abstract: A numerical simulation on a flat plate,which has free coming flow at infinite distances-has been pro-cessed with pseudo-spectral methods.Boundary layer equations are dispersed with pseudo-spectral matrix di-rectly and computed.The results are co
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文摘:本文对平板在自由来流情况下的层流边界层用伪谱方法进行了数值模拟,直接用伪谱矩阵方法对边界层方程进行离散并编程计算,与经典结果相比较,发现本文结果较好,下一步研究工作有了可靠的基础。 |
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Abstract: A open enterprise management information system has four characters：generality,adaptability,compatibility and friendly interface.Based on AIBAS system,it describes that the prerequisites of open system are：open system model,structure,advanced de
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文摘:以AIBAS系统为例，论述了开放式系统应该具备的前提条件为：开放式系统模型，开放式系统结构，先进的系统开发工具，面向多企业功能的参考模型，面向对象的关系型数据库系统，业务应用程序接口，用户友好的操作界面。 |
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Abstract: A paint vapour treatment by means of blowing and drawing ventilation in an airtight workroom is suggested in the article.
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文摘:提出在密闭喷漆作业间，采用吹吸式通风法对作业间的漆雾进行治理的方案。 |
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Abstract: A piezoelectric resonance-conveying machine is developed by using homemade piezoelectric ceramic chips,and the structural parameters of its main parts is optimized and researched.A intelligent and multifunctional power supply to drive resonance-
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文摘:用国产压电陶晶片研制出压电式振动给料器，并对其主要部件结构参数进行了优化研究，还研制出驱动压电式振动给料器的智能化多功能电源，该压电式振动给料器由于具有多项优良品质可望成为振动给料器的换代产品。 |
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Abstract: A practical staining method for counting polyhedra (PIBs) in nucleopolyhedrovirus insecticide was developed.
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文摘:本文介绍了一种直接检测病毒杀虫剂产品中多角体数量的染色计数方法。 |
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Abstract: A previously proposed approximate quasi-static theoretical method is employed herein to examine the deformation and perforation of a simply-supported circular plate struck by a flat-faced projectile at normal incidence.Based on the principle of
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文摘:采用准静态近似理论方法分析简支圆板在平头弹丸正撞下的变形和穿透.首先基于虚功原理得到了静态荷载位移关系,并将其用于预测低速冲击下圆板的能量吸收能力.当考虑了材料的应变率敏感性,并且不发生绝热剪切冲塞破坏的前提下,理论预测和实验结果吻合良好. |
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Abstract: A principle of linear CCD prism spectrometer system used to measure colors is presented.The spectrum sensitivity of the system is measured and its test and verify is finished in experiment.The reasons for error of the system is analyzed and impr
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文摘:介绍了用于颜色测量的线阵CCD棱镜光谱仪系统的工作原理，测出了系统的光谱灵敏度并作了实验验证，对系统的误差原因及改进措施进行了分析。 |
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Abstract: A probability calculation formula used for the cavity dimension of injection mold is derived on the basis of analysing the variation rule of plastic shrinkage rate, and a quantitative relation among the variation of plastic shrinkage rate, plast
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文摘:在分析塑料收缩率波动规律的基础上，导出了注塑模成型零件工作尺寸的概率计算公式，讨论了塑料收缩率波动范围、塑件尺寸公差、制造公差以及修模裕磨量之间的关系。 |
