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目的 对无张力疝修补和传统疝修补术中作一对比分析,总结其优缺点.方法 对我院开展的无张力疝修补术组和传统疝修补手术组作一回顾性分析,观察手术时间、术后并发症、复发率及住院时间.结果 无张力疝修补术较传统疝修补术手术时间及住院时间短,术后并发症少,复发率低.结论 无张力疝修补较传统疝修补更符合人体解剖,是较先进的疝修补术式. 相似文献
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文章对PLC自动控制系统可靠性问题进行了较深入的探讨,提出了提高系统可靠性运行的方法.这些方法对提高系统的可靠性有积极的参考意义. 相似文献
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目的 对无张力疝修补和传统疝修补术作一对比分析,总结其优缺点.方法 对我院开展的无张力疝修补术组和传统疝修补手术组作一回顾性分析,观察手术时问、术后并发症、复发率及住院时间.结果 无张力疝修补术较传统疝修补术手术时间及住院时间短,术后并发症少,复发率低.结论 无张力疝修补较传统疝修补更符合人体解剖,是较先进的疝修补术式. 相似文献
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微波无溶剂条件下,3-硝基苯甲醛和乙酰乙酸酯进行缩合反应,反应时间较传统方法大大缩短,而且收率达到或超过了传统方法. 相似文献
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Fred Gelbard 《Aerosol science and technology》2013,47(2):399-412
A new “moving-sectional” method is presented to solve the dynamics of multicomponent aerosol particle growth by vapor condensation in a closed system. The method controls numerical diffusion and stiffness by adapting the method of characteristics to a sectional representation of the aerosol. An exact solution for a closed system is presented, and the “moving-sectional” method gives excellent agreement when tested against this solution. Four cases are presented to demonstrate the importance of the solute, Kelvin, and latent heat effects. 相似文献
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A simple and versatile method for the decoration of CVD grown graphene with metal nanoparticles is presented. The mechanism of nanoparticle formation is galvanic displacement resulting in physically adsorbed clusters. The single layer graphene obtained by this method can be easily transferred. Integration onto a gas sensing transducer is presented as proof of concept. 相似文献
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利用有限体积法(FVM)对双极坐标系下变系数二阶流体在内管做轴向往复运动的偏心环空中非定常流的控制方程进行了离散,其中时间积分方案采用全隐式,再利用交替方向隐式方法(ADIP)对离散方程组进行了数值求解;通过对视为变系数二阶流体的不同质量分数的聚丙烯酰胺(HPAM)水溶液在内管做轴向往复运动的偏心环空中的非定常流动实验,在相同条件下,在利用该方法数值求解上述控制方程后得到速度场的基础上,结合流量公式,将数值计算得到的流量与实测流量进行了比较,并将比较的吻合程度与其它方法得到的吻合程度进行了对比。结果表明:本文所给数值计算方法是正确的;利用本文方法数值计算得到的流量与实测流量的吻合程度比另外两种方法更好,且数值计算步骤较为简便、计算速度较快。 相似文献
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本文提出了一种基于波动方程理论的合成震源记录逆时偏移方法,从双程无反射波动方程出发,实现了声波在数值空间的逆时延拓。提出了两种适用于逆时偏移的成像条件:零时刻成像条件和互相关成像条件,并在互相关成像条件的基础上就速度变化界面的低频假象问题提出了一种改进的成像条件:Pothyn Vector成像条件,文中所给模型的试算结果进一步说明了这三种成像条件的有效性和实用性。 相似文献
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James W. Gentry 《加拿大化工杂志》1970,48(4):451-455
A new method for the numerical solution of a stagewise process is presented. The method consists of total linearization of all the equations in the distillation process, using the method of quasi-linearization. The resulting equations form a block-band matrix which can be readily solved by a method developed by the author. The method used for obtaining convergence is presented. The method has been tested for both binary and multi-component systems. The method has been compared with the Amundson-Pontinen method for a five component mixture. The method gives more rapid convergence. Numerical experiments indicate that the vapor and liquid flow rates are more stringent requirements than the bubble point. 相似文献
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A computational scheme is presented for the calculation of molecular weight distribution in styrene polymerization initiated
by a binary initiator system. In this paper, the method of finite molecular weight moment is presented by calculation of the
polymer chain length distribution. This method is compared with the method of integrating an infinite number of polymer population
balance equations. The results of the two methods show a reasonably good agreement. It is possible to produce polymer having
the same molecular weight distribution. 相似文献
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一种新的测量数据校正方法—两步法 总被引:1,自引:0,他引:1
测量数据中所含的测量误差是影响化工过程监控质量的重要因素之一。本文提出一种新的测量数据校正方法—两步法,用于将难以求解的非线性校正问题转化为线性校正的问题,从而使得数据校正过程大为简化。文中还导出了两步法应用于反应器测量数据校正的公式。 相似文献