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Abstract: It was studied by us that new technologies using strong pulsed magnetic field and electric current were applied to refine metal's solidified structure.These technologies improved remarkably the solidified structure of LY12 aluminum alloy and mad
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文摘:提出了用强脉冲磁场和电流细化金属凝固组织的新工艺.与未经磁场或电流处理的凝固样品相比，强脉冲电磁场能够显著地改善LY12铝合金的凝固组织，使晶粒明显细化、球化,电磁场的强度愈强，这种改善效果愈明显.对该新工艺的细化机理进行了理论分析，同时，指出了实验中的新现象和新问题. |
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Abstract: It was verified through experiment and measurement that there was growth phenomenon taking place with nodular iron castings after graphitizing annealing at low temperature.The emergence mechanism and reason of the “ annealing growth nature” was
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文摘:通过试验和测试，证实了球铁件经低温石墨化退火后存在的生长现象，并对这种“退火生长性”产生的机理及原因进行探讨，提出了防止措施。 |
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Abstract: It's an important problem to determine the stability of zero solutions of linear neutral differential equation. A simple judgment on this problem is given.
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摘要:线性中立微分方程的一个重要问题是其零解渐进稳定性。文章给出一个简便的稳定性判断准则。 |
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Abstract: Iterative learning control is an effective approach to the control of processes that are repetitive in nature.In this paper,an open-closed-loop PI-type iterative learning control scheme for the precise tracking control of a class of discrete non
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文摘:对于具有重复运动性质的对象，迭代学习控制是一种有效的控制方法.针对一类离散非线性时变系统在有限时域上的精确轨迹跟踪问题，提出了一种开闭环PI型迭代学习控制律.这种迭代律同时利用系统当前的跟踪误差和前次迭代控制的跟踪误差修正控制作用.给出了所提出的学习控制律收敛的充分必要条件，并采用归纳法进行了证明.最后用仿真结果对收敛条件进行了验证. |
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Abstract: Judicial proof authentication at court is a litigation procedure during which judges attest the truth of the case at court.
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文摘:法官当庭认证是法官当庭认证案件事实的一种诉讼活动。 |
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Abstract: Knowledge is not only an endogenous variable, but also an exogenous variable, which is the base to understand the characteristic of the increasing or decreasing return of hi-tochnology in knowlodgc-bascd cconomy.
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文摘:知识既是内生变量，又是外生变量，这是理解高科技知识报酬递增与递减特点的基础。 |
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Abstract: Large quantities of spheric silver colloidal particles, which were protected by poly vinyl pyrrolidone (PVP),can be converted into flake silver powders using photoinduced method.
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摘要：将银溶胶用适当的保护剂保护后，置于一定波长的可见光下进行辐照可以得到纳米级片状银粉。 |
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Abstract: Large time delay exists in complicated practical processes.For example,in FCCU (Fluidized Catalytic Cracker Unit) reactor-regenerator,the feed is preheated through heat exchanging from fractional column slurry,thus results in large time delay.A
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文摘:实际的复杂工业过程，往往具有大的时滞，例如：炼油厂催化裂化装置的反应再生系统，其原料油预热通过油浆换热实现，因此时滞特别大.本文针对这一类大的时滞过程，设计了以动态矩阵控制为核心算法的预测控制系统，运行实践表明：这一控制方案比原PID控制在控制质量上有较大提高. |
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Abstract: Large volume hyperbaric oxygen tank for medical usage was successfully constructed in our hospital according to “Regulatory and Safe Regime of Oxygen Tank for Medical Usage” by administration.
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文摘:我院为首批根据国家《医用氧舱安全管理规定》最新标准通过新建高压氧舱验收的单位之一。 |
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Abstract: Latest progress in oil refining catalyst techniques abroad was reviewed, including FCC, hydrofining, hydrotreating, hydrocracking and catalytic reforming catalysts, with emphasis on new products of some representative producers of oil refining c
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文摘:以国外炼油催化剂生产具有代表性的大公司推荐的新产品为例，综述了催化裂化、加氢精制、加氢处理、加氢裂化和催化重整五类石油炼制催化剂的技术发展近况，并列举了部分应用实例。 |
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Abstract: Layout forms of irrigation canal system can be generally classified as three categories: series-wound canal system, equivalent shunt-wound canal system and nonequivalent shunt-wound canal system.
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文摘:灌溉渠系的布置形式一般可分为串联渠系、等效并联渠系和非等效并联渠系，对这3种灌溉渠系水利用系数进行了理论研究。 |
