一种求解W(s)=0的有效算法

复变函数的幅角原理[1]给出了方程W（s）=0的根存在的充分和必要条件，但如何有效地确定这些根，还需要进一步探索。本文给出一种在复域解决这一问题的数值方法─—正交搜索法。该方法利用解析函数保角映射的特性，通过沿复变量s的实部和虚部交替搜索，逐步逼近和达到所求方程的根．该方法不需计算任何导数，直观、简便，且能在计算机上自动完成。应用该方法解决某工程问题，获得了满意的结果．     

阶梯式变厚度圆板轴对称弯曲的初参数解

应用广义函数推出阶梯式变厚度圆板轴对称弯曲的微分方程，并应用初参数和Ｗ算符来表述和求解该微分方程。给出了算例。     

电磁场非均匀正交各向异性媒质中的有限元法

针对非均匀正交各向异性媒质中的电磁场问题，给出了相应的约束方程和定解条件；对边值问题及其变分问题的等价性进行了证明。在此基础上建立了相应的有限元方程，并用非均匀正交各向异性媒质中的有限元方程进行了编程计算。     

求解结构动应力有限元方法的新探讨

利用常规有限元方法，结合数值计算方法对振型函数进行［Ｌ］算子的微分计算，从而可方便迅速的得到了复杂结构动应力响应，通过算例计算表明该方法具有较高的精度，较一般的动态有限元具有通用性强、计算简单等特点     

Adsorption isotherms of pigments from alkali-refined vegetable oils with clay minerals

Adsorption isotherms of pigments from alkali-refined oils (rapeseed, soybean, wheatgerm, safflower, corn, cottonseed and sunflower) were measured to investigate the applicability of the Langmuir and Freundlich equations and to elucidate the adsorption characteristics of pigments on sepiolites and standard activated clay. The Freundlich equation was more applicable to the experimental adsorption isotherms. The equilibrium amount adsorbed, acidity, pore size distribution and inflection of the Freundlich isotherms could be explained by assuming that pigments were adsorbed on the stronger acid sites in smaller pores at low concentration, and then in the larger ones when the concentration increased. The amount adsorbed increased with a rise in adsorption temperatures from 70 to 110°C, and the heat of adsorption was below 10 kcal/mol. The results indicate that pigments were physically adsorbed on the acid sites activated at higher adsorption temperatures.     

Effect of various packaging materials on storage stability of refined,bleached, deodorized palm oil

Refined, bleached, deodorized palm oil (RBD palm oil) was packaged in lacquered metal cans (LMC), green glass bottles (GGB), amber glass bottles (AGB), clear glass bottles (CGB), clear plastic bottles (CPB) and sealed polyethylene film (POLET), and stored in direct sunlight (40 ± 1°C) or in darkness (27 ± 1°C). Measurements of free fatty acid (FFA), peroxide value and anisidine value, at 14-day intervals for a period of 98 days, were used to assess the stability of the oil towards hydrolytic and oxidative deterioration. Total oxidation values for packaged oils stored in direct sunlight showed that LMC gave the greatest protection against oxidative deterioration, followed by GGB and AGB. POLET offered the least protection to the oil against oxidative deterioration, while CPB and CGB proved superior to POLET but inferior to GGB and AGB. For storage in the dark, LMC, AGB and GGB gave the greatest protection to RBD palm oil against oxidative deterioration, with no significant statistical differences between them, while CPB, CGB and POLET followed in that order, with significant differences between their respective abilities to protect the oil against oxidative deterioration. Oils packaged in CPB gave the highest FFA levels (statistically significant). The investigations clearly indicated that LMC is superior to all other tested packaging materials in offering maximum protection to RBD palm oil against hydrolytic and oxidative deterioration. Amber and green glass bottles could serve as viable alternatives to LMC, while CGB and CPB could be tolerated as suitable packaging systems for RBD palm oil. However, the study also clearly showed that POLET is unsatisfactory for use as packaging material for RBD palm oil.     

Considerations in estimating Nitrogen Recovery Efficiency by the difference and isotopic dilution methods

Nitrogen Recovery Efficiencies (NRE) as calculated by the Isotopic dilution technique or the difference method are subject to errors under different conditions. The assumptions underlying these methods and the conditions and factors that must be considered while using these methods have been discussed. Majority of the reports suggest that the difference method gives higher values than the isotopic dilution technique. Results of a pot experiment show the importance of accounting the N held in roots for estimating NRE by either of the methods. Although the isotopic dilution technique has been invariably more precise, it was not necessarily representing the true NRE value. Contrary to some earlier reports, it was observed that Added Nitrogen Interaction (ANI) occurred even in field experiments. Guidelines are provided to assist researchers in assessing the validity of using isotopic or difference method in a given situation. For conditions where the NRE values obtained by either of the methods are influenced by ANI, a method of correcting the NRE values has been suggested, to arrive at the most probable value.     

平板塑件瞬态传热解析解及其在冷却分析中的应用

简要介绍了建立冷却分析数学模型的两种方法，指出了循环迭代模型的不足，推导了平板塑件瞬态传热解析解，找出循环平均热流与边界温度的线性关系表达式，并将它应用于注塑冷却分析，建立了冷却分析的迭代模型，取代原来的循环迭代模型，从而取消了原冷却分析中的中间迭代计算，有效地减少了冷却分析的迭代次数，提高了运算效率。另外，循环迭代求解平板塑件温度场采用的是有限差分法，即近似数值解，而迭代模型采用的是解析解，从理论上讲结果更精确，所以对提高计算结果的精度有一定的改善作用。     

沸石的碱处理溶解

晶体的溶解与晶体的生长存在着密切的联系，详细研究沸石晶体的溶解行为将有助于更好的理解沸石晶体的生长机理。鉴于目前对沸石晶体的碱处理溶解行为的研究尚处于初始阶段，所以从沸石碱溶解的几点关键内容出发，如沸石的硅铝比对沸石碱处理的影响，焙烧“活化”后沸石的碱处理溶解行为的变化，沸石与其无定形前驱物的溶解性差异以及沸石的溶解机理和溶解动力学方程方面，综述了有关沸石碱处理溶解研究方面的最新动态。     

Application of the general rate model with the Maxwell-Stefan equations for the prediction of the band profiles of the 1-indanol enantiomers

The adsorption isotherm data of R- and S-1-indanol and of their racemic mixture on cellulose tribenzoate were measured by frontal analysis. These experimental data were fitted to the single-component and the modified competitive Bilangmuir isotherms. The overloaded elution profiles of bands of the pure enantiomers and of the racemic mixture were calculated for different sample sizes, using the best competitive isotherm model and the General Rate Model of chromatography coupled with the generalized Maxwell-Stefan equation that describes the surface diffusion flux. The calculated and the experimental profiles were found to be in excellent agreement in all cases. The parameters of the model of the mass transfer kinetics were derived from the band profiles obtained for the pure enantiomers. The same values of these parameters give an excellent prediction of the profiles of multicomponent bands. The new model described here allows a satisfactory interpretation of the competitive mass transfer kinetics.