AVM/蒙脱石复合材料的制备及吸水保水性能的研究

通过乙酸乙烯酯／顺丁烯二酸酐（ＶＭ）共聚树脂的碱解，制备了水溶性的碱解ＶＭ树脂（ＡＶＭ）．用ＣａＣｌ２将ＡＶＭ水溶与蒙脱石水悬浮体共凝胶，制备了ＡＶＭ／蒙脱石复合材料．吸水性和保水性测试结果证示：当ＣａＣｌ２用量为１０％，蒙脱石用量为１５％时，复合材料的吸水性和保水性最好．粒度测试结果表示蒙脱石在水中的粒径为０．７５μｍ，属于超微细分散．ＳＥＭ照片显示，ＡＶＭ／蒙脱石复合材料具有疏松的凝胶结构．     

2-Join decomposition lattices

In this paper we characterize principal element lattices and Dedekind domains in terms of 2-join decomposition lattices. Received March 2, 1999; accepted in final form July 10, 2000.     

脊形掺铒Al2O3光波导放大器级联特性的模拟计算

利用有限元法分析了脊形掺铒Al₂O₃光波导放大器内信号光和抽运光的场模式分布、速率方程求解铒离子五能级系统的粒子数分布.数值模拟了光波导净增益与信号光功率的关系和多个放大器级联的净增益特性.结果表明：级联系统存在着净增益亏损.低掺铒浓度的光波导作前级放大器的组合方式,级联系统总净增益最大.     

Market Power Issues in Bid-Based Hydrothermal Dispatch

The objective of this work is to investigate market power issues in bid-based hydrothermal scheduling. Initially, market power was simulated with a single stage Cournot–Nash equilibrium model. In this static model the equilibrium was calculated analytically. It was shown that the total production of N strategic agents is smaller than the least-cost solution by a factor of (N/(N+1)). Market power analysis for multiple stages was then carried through a stochastic dynamic programming scheme, where the decision in each stage and state is the Cournot–Nash equilibrium of a multi-agent game. Case studies with data taken from the Brazilian system are presented.     

1.6Cell光阴极微波电子枪冷测及初步高功率实验研究

介绍了清华大学加速器实验室BNL/KEK/SHI型1.6cell微波枪调谐以及老练的初步结果. 调谐过程中, 测量了耦合孔尺寸与外部品质因数之间的关系; 给出了0模和π模的频率、单腔频率以及场分布. 目前, 该微波电子枪正在进行高功率微波老练, 给出了该枪初步的微波老练的情况及测量结果.     

态|Ψ_n~((2))〉_q的广义非线性等阶N次方H压缩效应

构造了一种新型的多模叠加态 |Ψ(2 )n 〉q=C(R)n |{ -i Z*j }〉q+C(0 )n |{ 0 j}〉q;并首次详细地研究了此量子态的等阶 N次方 H压缩特性 .大量的计算和分析表明 :态 |Ψ(2 )n 〉q是一种多模典型的非经典光场 ;还发现了“相似压缩”等现象     

Spectral Gap for Stable Process on Convex Planar Double Symmetric Domains

We study the semigroup of the symmetric α-stable process in bounded domains in R ². We obtain a variational formula for the spectral gap, i.e. the difference between two first eigenvalues of the generator of this semigroup. This variational formula allows us to obtain lower bound estimates of the spectral gap for convex planar domains which are symmetric with respect to both coordinate axes. For rectangles, using “midconcavity” of the first eigenfunction (Bañuelos et al., Potential Anal. 24(3): 205–221, 2006), we obtain sharp upper and lower bound estimates of the spectral gap.     

Gap functions and global error bounds for differential variational–hemivariational inequalities

This paper concerns with the study of a differential variational–hemivariational inequality (DVHVI, for short) in infinite-dimensional Banach spaces. We first introduce the new concept of gap functions for the variational control system of (DVHVI). Then, we consider two kinds of gap functions which are regularized gap function and Moreau–Yosida regularized gap function, respectively, and examine the relevant properties of the gap functions. Moreover, two global error bounds which depend implicitly on the regularized gap function and the Moreau–Yosida regularized gap function, accordingly, are obtained. Finally, in order to illustrate the applicability of the theoretical results, we investigate a coupled dynamic system which is formulated by a nonlinear reaction–diffusion equation described by a time-dependent nonsmooth semipermeability problem.     

Effect of ultrasonic power on the stability of low-molecular-weight oyster peptides functional-nutrition W1/O/W2 double emulsion

Ultrasonic-assisted treatment is an eco-friendly and cost-effective emulsification method, and the acoustic cavitation effect produced by ultrasonic equipment is conducive to the formation of stable emulsion. However, its effect on the underlying stability of low-molecular-weight oyster peptides (LOPs) functional-nutrition W₁/O/W₂ double emulsion has not been reported. The effects of different ultrasonic power (50, 75, 100, 125, and 150 W) on the stability of double emulsions and the ability to mask the fishy odor of LOPs were investigated. Low ultrasonic power (50 W and 75 W) treatment failed to form a well-stabilized double emulsion, and excessive ultrasound treatment (150 W) destroyed its structure. At an ultrasonic power of 125 W, smaller particle-sized double emulsion was formed with more uniform distribution, more whiteness, and a lower viscosity coefficient. Meanwhile, the cavitation effect generated by 125 W ultrasonic power improved storage, and oxidative stabilities, emulsifying properties of double emulsion by reducing the droplet size and improved sensorial acceptability by masking the undesirable flavor of LOPs. The structure of the double emulsion was further confirmed by optical microscopy and confocal laser scanning microscopy. The ultrasonic-assisted treatment is of potential value for the industrial application of double emulsion in functional-nutrition foods.