蜂窝纸板综合性能的研究

通过对几种蜂窝纸板的可比性试验,分别得出其强度值。在此基础上,经过对试验数据的分析及处理,做出了综合性能二维曲线,从理论和试验上得出蜂窝纸板具备的优势及综合性能最优时的厚度和内径。     

High-Performance Directional Metallopolyamides. II. Optical Spectroscopic Studies of Metal Chelation

The chelating interaction between metal ions and 4,4-disubstituted-2,2-bipyridyl-containing high-performance polymeric ligands prepared from 2,2-bipyridyl-4,4-dicarboxylic acid and a series of primary aromatic diamines was investigated by optical spectroscopy. Optical spectroscopic studies of the chelation of ruthenium ions by the 2,2-bipyridyl-containing polyamides revealed the formation of distinct ruthenium(II) complexes [Ru^II(poly)L₄] ( _max=530 nm), [Ru^II(poly)₂L₂] ( _max=584 nm), and [Ru^II(poly)₃]²⁺ ( _max=476 nm), while iron(II) ions formed only one complex ( _max=569 nm). The diverse functional features of the polymer repeat unit directly influences the chelation of metal ions.     

Application of a sensorial response model to the design of an oral liquid pharmaceutical dosage form

In this paper, we discuss the application of a compartmental model to study the sensorial response, in terms of taste intensity versus time, in an oral solution for pharmaceutical use. The numerical model was developed from sensorial response curves obtained by a panel of three trained individuals. Parameter identification was carried out by means of a least-squares procedure that obtained the linear coefficients in the model by solving an exact linear least-squares problem conditional on the values of the nonlinear parameters for each iteration. Thus, nonlinear estimation was done in terms of the first-order kinetic parameters only, and ill-conditioning of the Hessian matrix present in these models was solved. Results of modeling for a set of formulations were used to determine the effects of various ingredients (sweeteners and an essence) on a baseline unflavored formulation of acetaminophen in a mixture of cosolvents. The first moment of the area under the curve of taste intensity versus time was found to be the best global indicator of taste for the purpose of product design. It was found that a mixture of sweeteners and an essence was the most efficient way of masking the bitter taste of this active ingredient.     

Dislocation emission criterion for a wedge crack under mixed mode loading

Dislocation emission criterion for a wedge crack under mixed mode loading was investigated using Airy stress function. The order of singularity at the wedge crack tip due to remote loading was found to vary with the loading mode. The plastic zones for plane stress and plane strain were studied based on von Mises' and Tresca criteria. The dislocation emission criterion was examined for both loading modes. The mechanism of crack propagation was believed to be controlled by dislocation emission. Under an action of Mode I loading, the wedge tip movement occurred when a pair of edge dislocations of Burgers vectors be ⁱ and –be ^–i were emitted from the wedge tip where b and were the magnitude of Burgers vector and the angle between the positive x axis and the line connecting from the tip to dislocation. Similarly, under an action of Mode II loading, the wedge crack tip moved as soon as either an edge dislocation of Burgers vector along the x direction was emitted from its tip or a pair of edge dislocations of Burgers vectors be ⁱ and be ^–i were emitted from the wedge tip. The conventional mechanism of crack propagation based on the energy release rate was not expected to occur. The calculated results for a few special cases were presented and compared with those reported in the literature.     

Generalized stress intensity factors in the interaction between two fibers in matrix

To evaluate the mechanical strength of fiber reinforced composites it is necessary to consider singular stresses at the end of fibers because they cause crack initiation, propagation, and final failure. The singular stress is expressed by generalized stress intensity factors defined at the corner of fibers. As a 2D model an interaction between rectangular inclusions under longitudinal tension is treated in this paper. The body force method is used to formulate the problem as a system of singular integral equations with Cauchy-type or logarithmic-type singularities, where the unknown functions are the densities of body forces distributed in infinite plates having the same elastic constants as those of the matrix and inclusions. In order to analyze the problem accurately, the unknown functions are expressed as piecewize smooth functions using two types of fundamental densities and power series, where the fundamental densities are chosen to represent the symmetric stress singularity of 1/r ^1– ₁ and the skew-symmetric stress singularity of 1/r ^1– ₂. Then, generalized stress intensity factors at the end of inclusions are systematically calculated for various locations, spacings and elastic modulus of two rectangular inclusions in a plate subjected to longitudinal tension.     

紫外灭菌灯灭菌无效空间的分析与处理

对直管式紫外灭菌灯灭菌无效空间进行了分析，在此基础上提出了一种新型通用灯架及使用方法，给出了灭菌空间的分析数据。     

非对称载荷作用的Griffith裂纹问题的Fourier积分变换解法

本文使用Ｆｏｕｒｉｅｒ积分变换，对非对称载荷作用下的Ｇｒｉｆｆｉｔｈ裂纹问题进行了研究。利用裂纹两侧的位移和应力联结条件，将问题归结为一组带Ｃａｕｃｈｙ核的奇异积分方程，通过Ｃａｕｃｈｙ反演求得了问题的精确解，在此基础上．给出了其应力强度因子的表达式。该结果可作为基本解用于求解一般裂纹系问题。     

阎地拉图红铁矿选矿工艺研究

对阎地拉图红铁矿进行了焙烧磁选、强磁选、重选及重选－强磁选四种选矿工艺的试验研究，结果表明，用螺旋溜槽选别＋０．０７４ｍｍ粒级，用强磁选别－０．０７４ｍｍ粒级的重选－强磁选方案可得到品位为５１．００％、回收率为７２．３０％的综合铁精矿。该方案投资少，生产成本低，适合现厂的实际。     

动力学在香蕉涂膜保鲜中应用的研究

本文研究了香蕉涂膜前后呼吸反应的动力学过程；建立了香蕉呼吸强度Ｒ＿（ｃｏ＿２）、气体渗透系数Ｐ＿ｇ与温度Ｔ、二氧化碳浓度Ｙ、时间τ、薄膜厚度δ之间的动力学方程式；根据实验测试数据确定了方程式中的常数Ｋ＿１、Ｋ＿２、Ｋ＿（ｃｏ＿２），、Ｅ和ｂ。分析了可食用ＣＡＳＰ保鲜薄膜的特性和对香蕉的保鲜效果。从而选择和控制了香蕉的最佳保鲜条件。     

从梳理度看梳棉工艺路线之确定

本文分析了影响梳理度的诸因素,并从确保梳理度的角度出发,论证了目前国产梳棉机的工艺路线以高速度,强分梳,小速比、较轻定量为宜。