非线性DEDS的周期时间配置与凝着色图

对于用极大极小函数描述的非线性离散事件动态系统(DEDS)，提出一种凝着色图方法。用该方法证明了不同周期时间的数日等于凝点的数日。在此基础上给出了能用状态反馈(独立)配置周期时间的充要条件，解决了与传统线性控制系统极点配置问题完全对应的问题。将该结果应用于线性DEDS，得到了配置域及缩短的周期时间。     

采用BETHSY自然循环实验数据对CATHARE2 V1.5qR6程序的评价

采用BETHSY自然循环实验数据对CATHARE2 V1.5qR6进行了评价.结果表明CATHRE2V1.5程序能较好地预测试验装置单相自然循环条件下的热工水力现象,对单相自然循环向两相自然循环的转变以及两相自然循环向回流冷凝运行方式的转变发生时的一回路水装量预测也比较准确,但对于两相自然循环及回流冷凝运行方式下系统的一些主要热工水力参数预测欠佳.评价结果表明,与许多国际性大型热工水力分析程序一样,CATHARE2V1.5qR6程序对剧烈两相流动的预测能力仍有待改进和完善.     

四氢噻喃并吡喃衍生物的合成及反应机理

利用四氢噻喃-3，5-二酮与查尔酮的缩合反应合成出2，4-二苯基-5-氧代四氢噻喃并[4，3－d]v-吡喃，并探讨了其反应机理，提出了反应历程．     

调湿建材应用于辐射供冷房间的可行性

本文从分析辐射供冷形式入手,指出目前影响辐射供冷推广的关键因素:室内空气相对湿度和结露.讨论了调湿建材的调湿原理,分析了调湿建材应用于辐射供冷房间调节室内湿度以保证供冷系统正常使用的可能性.提出了在设计时应注意的湿平衡曲线、配合装修、配合置换通风等几个问题.     

Research on the effect of Reynolds correlation in natural convection film condensation

Film condensation is a vital phenomenon in the nuclear engineering applications,such as the gas-steam pressurizer design,and heat removing on containment in the case of postulated accident.Reynolds number in film condensation can be calculated from either the mass relation or the energy relation,but few researches have distinguished the difference between them at present.This paper studies the effect of Reynolds correlation in the natural convection film condensation on the outer tube.The general forms of the heat transfer coefficient correlation of film condensation are developed in different flow regimes.By simultaneously solving a set of the heat transfer coefficient correlations with Remass and Reenergy,the general expressions for Remass and Reenergy and the relation between the corresponding heat transfer coefficients are obtained.In the laminar and wavefree flow regime,Remass and Reenergy are equivalent,while in the laminar and wavy flow regime,Remass is much smaller than Reenergy,and the deviation of the corresponding average heat transfer coefficients is about 30％ at the maximum.In the turbulent flow regime,the relation of Remass and Reenergy is greatly influenced by Prandtl number.The relative deviation of their average heat transfer coefficients is the nonlinear function of Reynolds number and Prandtl number.Compared with experimental results,the heat transfer coefficient calculated from Reenergy is more accurate.     

防水透气膜水蒸气透过性能和不透水性在应对建筑结露问题的功用及性能测试

为合理把握防水透气膜的防水和透气性能,从结露现象的本质入手分析了防水透气膜在应对建筑结露问题的作用机制,并从试验测试和生产工艺的角度提出了防水透气膜的性能控制要点。     

Port reduction in parametrized component static condensation: approximation and a posteriori error estimation

We introduce a port (interface) approximation and a posteriori error bound framework for a general component‐based static condensation method in the context of parameter‐dependent linear elliptic partial differential equations. The key ingredients are as follows: (i) efficient empirical port approximation spaces—the dimensions of these spaces may be chosen small to reduce the computational cost associated with formation and solution of the static condensation system; and (ii) a computationally tractable a posteriori error bound realized through a non‐conforming approximation and associated conditioner—the error in the global system approximation, or in a scalar output quantity, may be bounded relatively sharply with respect to the underlying finite element discretization. Our approximation and a posteriori error bound framework is of particular computational relevance for the static condensation reduced basis element (SCRBE) method. We provide several numerical examples within the SCRBE context, which serve to demonstrate the convergence rate of our port approximation procedure as well as the efficacy of our port reduction error bounds. Copyright © 2013 John Wiley & Sons, Ltd.     

八氯甲基笼型倍半硅氧烷的合成及表征

以氯甲基三氯硅烷为原料,甲醇、氯仿和石油醚为混合溶剂,在浓盐酸和无水三氯化铁为催化剂的条件下水解缩合制备了八氯甲基笼型倍半硅氧烷(CM-POSS)。利用FT-IR、GPC、1 H-NMR、29Si-NMR和XRD等技术对产物的结构进行了表征,并通过TGA研究了其热稳定性。结果表明产物为八氯甲基笼型倍半硅氧烷,且热稳定性良好。     

直接法合成月桂酰基甲基牛磺酸钠

以月桂酸和N-甲基牛磺酸钠为原料,经直接缩合一步反应合成了月桂酰基甲基牛磺酸钠。考察了直接法缩合工艺中反应温度、反应时间、催化剂种类和用量、投料比、溶剂用量等对反应的影响。结果表明,优化反应条件为:月桂酸与N-甲基牛磺酸钠投料摩尔比为1.3∶1,催化剂硼酸用量为月桂酸质量的2%,溶剂用量为月桂酸质量的40%,215℃反应6 h。在上述条件下,N-甲基牛磺酸钠的转化率可达95%以上,粗产品经重结晶及干燥处理后纯度可达98%以上。     

Synthesis and characterization of MQ silicone resins

MQ silicone resins, which represent a broad range of hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q), were synthesized by reaction of water glass with hexamethyldisiloxane. The optimum reaction time and the optimal reaction temperature is 30 min and 30–40°C, respectively. Concentrated hydrochloric acid is the best one among those catalysts tested. In large-scale experiments (420–1680 mL), the favorable feeding order is catalyst first, and then water glass, the mixture of hexamethyldisiloxane and ethanol last and most MQ silicone resin was observed. The structure of MQ silicone resin was characterized by FT-IR and GPC spectra. The MQ silicone resin shows narrow molecular weight distribution and the number average molecular weight of MQ silicone resin is 2917. The silicone pressure sensitive adhesive prepared from as-synthesized MQ resin has good tack (29#) and 180° peel adhesion (5.630N/20 mm). © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012