高能核-核碰撞Drell-Yan过程K因子常数性的研究

在高能核 -核碰撞Drell Yan过程考虑湮没项和康普顿散射项的基础上 ,利用双重Q2 重标度模型 ,分别计算了碳、钙、铁、锡与其自身的核 -核碰撞 .结果表明 ,对于不同的x1值 ,K因子随x2 的变化很不相同 ;同时 ,K因子变化的幅度是随核素A不同而发生微弱变化的 ,在特定的x1,x2 取值有限范围内它不能近似取为常数 .

SPH方法中常数一致性核函数的建立及公式化

施加边界条件的不足是SPH方法的一个棘手问题,因为在结构边界外没有颗粒的存在,使得在边界处核函数的单位特性不能得到满足。施加"伪"颗粒是目前通用的一种方法,但是对于不规则结构和复杂几何边界,确定这些"伪"颗粒非常困难。本文讨论通过使用满足常数一致性的核函数来改善边界的不足。文章首先通过三种方法推导了满足常数一致性条件的核函数及其函数梯度的表达式,发现了两个不同分母式的表达,分析了满足常数一致性的修正核函数的数学特性。开展了二维和三维的算例比较,结果发现使用修正的核函数对边界条件有明显改善,对计算精度和稳定性也有显著提高。

微胶囊膜厚对渗透性常数的影响

本文采用光学显微镜二次聚焦法测定出微胶囊膜厚,通过理论公式计算出微胶囊渗透性常数,从而揭示出微胶囊膜厚对渗透常数的影响规律。结果表明:在实验范围内,甲醛用量、复凝聚次数、芯料用量、搅拌速度、乳化时间等工艺条件发生变化时微胶囊的膜厚均对渗透性常数起着重要作用。

芳香性常数A——芳香性判据之一

本文计算了41个化合物的芳香性常数A,与REPE值比较的结果,进一步证明其可作为芳香性的判据.

线性一致逼近中的广义强单一性常数及其计算

对线性最佳一致逼近，引入广义强单一性常数，研究其特性并得到一个方便的计算方法．该常数已用于估计（ 未知的真正） 最佳逼近与已计算得到的最佳逼近（ 由于计算机的舍入误差，故实际计算得到的仅是拟交错最佳逼近） 之间的误差．

非线性一致逼近中域上的局部强单一性常数

在局部Haar条件和其他一般条件下,把Bartelt和Henry的关于逼近域的线性一致逼近强单一性常数的连续性定理推广到非线性局部一致逼近.同时。

电场对负性介电常数各向异性的小分子胆甾相液晶的作用

介绍和总结了在边界条件影响很大的受限胆甾相和聚合物分散小分子胆甾相液晶(PDCLC)两种情况下 ,外电场对负性介电常数各向异性的小分子胆甾相液晶的作用。前者的研究通过在不变的螺距 p情况下改变液晶盒厚度d与外电场电压值E ,发现了规律性变化的液晶相的相态结构。而对PDCLC的研究中 ,通过平行和垂直于电场方向的观察 ,得到了胆甾相变化与外加电压的具体关系 。

废水生物处理中基质亲和性常数的测定方法探讨

介绍了废水生物处理中基质亲和性常数(Ks值)的测定方法:间歇进水法、连续流恒化器法、无限稀释法和间歇进水改进法,并对这4种方法的测定原理、方法以及优缺点进行了比较,讨论了各自的适用范围。分别采用4种方法对生物处理含酚废水的Ks值进行了测定。结果表明:经过长期驯化的活性污泥具有较好的苯酚亲和性,其Ks值约为0.06mg/L。间歇进水法不适用于测定低Ks值的情况,连续进水法的测定时间较长,对于混合培养体系也不适用,无限稀释法和间歇进水改进法均能快速准确地测定Ks值,后者操作更为简便。

碱金属双原子基团振动力常数、非谐性常数及谐振动波数间的关系

基团（离子及分子）的红外光谱及拉曼光谱波数变化复杂．寻找其变化规律性，并从基团的物理化学特性加以阐述，是研究工作的一个重要方面．我们找到了某些碱金属双原子基因谐振动波数及非谐性常数的规律性变化．由谐振动波数计算得力常数。发现力常数具有规律性变化（个别例外）。为常数变化、谐振动波数变化及非谐性常数变化基本上是平行的。

硼族元素双原子基团的振动力常数、非谐性常数及谐振动波数之间的关系

分析了某些硼族元素双原子基团谐振动波数及非谐性常数的变化规律;由谐振动波数计算得到振动力常数,发现力常数的数值呈规律性变化;且力常数、谐振动波数以及非谐性常数的变化,基本上具有相关性。

钙调素与细胞膜上Ca^（2＋）－ATP_（ase）结合域之间亲和性常数的测算

钙调素（Ｃａｌｍｏｄｕｌｉｎ，ＣａＭ）是一种多功能的酶调节物。Ｃａ２＋－ＣａＭ复合物可激活Ｃａ２＋－ＡＴＰａｓｅ，并触发Ｃａ２＋从细胞内移出或进入肌浆网内，以维持细胞内钙的平衡。Ｃａ２＋－ＣａＭ与Ｃａ２＋－ＡＴＰａｓｅ之间的相互作用可用亲和性常数来衡量。本文应用ＢＣＡ方法测定钙调素的浓度，应用ＳＤＳ－ＰＡＧＥ电泳技术测定钙调素的分子量，再用钙调素滴定ＤＣ２０Ｗ，同时测定相应的荧光，从而决定出两者相互作用的亲和性常数。

微型胶囊的渗透性能研究

本文导出了测定微型胶囊渗透性常数的公式,实验结果与理论分析有较好的一致性。并且根据所导出的公式,研究了复凝聚法中,芯料用量及芯料分子结构与微型胶囊渗透性常数的关系。结果表明,微型胶囊的渗透性常数随着芯料用量的增加而增加;不同分子结构的芯料的渗透性常数的大小,由其分子量和分子结构中所含基团的性质决定。

界面缩聚法微型胶囊的渗透性能

根据前文导出的理论公式研究了界面缩聚法中单体用量、乳化剂用量、乳化时间及反应时间对微型胶囊渗透性能的影响规律。实验结果表明,所导出的公式不仅适用于含非水溶性芯料的微型胶囊,也适用于含水溶性芯料的微型胶囊;在实验范围内,微型胶囊渗透性常数随着单体用量比的变化出现一个极小值,随着乳化剂用量的增加出现一个极大值;乳化时间延长,微型胶囊的渗透性常数减小;反应时间延长,微型胶囊的渗透性常数也减小。

常系数线性差分方程通解的显式表示

将 n阶常系数线性差分方程化为矩阵形式 ,利用 Frobenius矩阵求得特解的显式表示 ,进而求得它的通解的显式表示 ,该通解不涉及不定方程求非负解问题 ,并给出用二项式系数表示广义 Fibonacci数列解的关系式 .

工程机械构件非线性振动的数值仿真及实验研究

利用等效线性化的方法分析了工程机械结构的间隙非线性振动问题。计算模型采用工程机械中常见的带间隙和初载偏移的非线性系统，给出了这类系统的等效刚度和幅频特性。

First-principle calculations of ductile CeAg intermetallic compound

The first-principle calculations were performed to investigate the structural,mechanical,electronic and thermal properties of the binary ductile intermetallic compound CeAg with B2（CsCl） structure.The calculated value of lattice constant a0 for CeAg with generalized gradient approximation is 3.713-,which is in better agreement with experimental data than local spin density approximation.The negative energy of formation implies that CeAg with B2 structure is thermodynamically stable phase.The greater separation between the d bands of Ce and Ag results in weaker bond hybridization of Ce d—Ag d,which prevents formation of directional covalent bonding.The three independent elastic constants（C11,C12 and C44） are derived and the bulk modulus,shear modulus,elastic modulus,anisotropy factor,and Poisson ratio are determined to be 57.6 GPa,15.8 GPa,43.4 GPa,3.15 and 0.374,respectively.The elastic constants meet all the mechanical stability criteria.The value of Pugh＇s criterion is 3.65.The ductility of CeAg is predicted if Pugh＇s criterion is greater than 1.75.Furthermore,the variations of volume,bulk modulus,heat capacity,and thermal expansion coefficient with temperature and/or pressure were calculated and discussed.

Theoretical prediction of effective elastic constants for new intermetallic compound porous material

Based on microstructure analysis of the new Ti-A1 intermetallic compound porous material, a micromechanics model of heterogeneous Plateau porous structure was established and calculation formulas of elastic constants （including effective elastic modulus, effective shear elastic modulus and effective Poisson ratio） were derived by the energy method for this porous material. Calculation results show that both the effective elastic modulus and effective shear elastic modulus increase with the increase of the relative density while the effective Poisson ratio decreases. Compared with the currently-existing hexagonal honeycomb model and micromechanics model of composite materials, the micromechanics model of heterogeneous Plateau porous structure in this study is more suitable for characterizing the medium-density porous material and more accurate for predicting the effective elastic constants of the medium-density porous material. Moreover, the obtained explicit expressions of the effective elastic constants in term of the relative density rather than the microstructural parameters for the uniform and regular Plateau porous structure are more convenient to engineering application.

Biaxial tensile properties and elastic constants evaluation of envelope material for airship

This paper presents an experimental study to determine the tensile properties of the envelope fabric Uretek3216L under biaxial cyclic loading.First the biaxial cyclic tests were carefully carried out on the envelope material to obtain the stress-strain data and the corresponding nonlinearity and orthotropy of the material were analyzed. Then for some determination options with different stress ratios the least squares method minimizing the strain terms was used to calculate the elastic constants from the experimental data.Finally the influences of the determination options with different stress ratios and the reciprocal relationship on the elastic constants were discussed.Results show that the orthotropy of the envelope material can be attributed to the unbalanced crimp of their constitutive yarns in warp and weft directions and the elastic constants vary noticeably with the determination options as well as the normalized stress ratios.In real design practice it is more reasonable to use constants determined for specific stress states in particular stress ratios depending on the project＆#39;s needs.Also calculating the structures with two limitative sets of elastic constants instead of using only one set is recommendable in light of the great variety of the constant＆#39;s values.

The algorithm of 3D multi-scale volumetric curvature and its application

To fully extract and mine the multi-scale features of reservoirs and geologic structures in time/depth and space dimensions, a new 3D multi-scale volumetric curvature （MSVC） methodology is presented in this paper. We also propose a fast algorithm for computing 3D volumetric curvature. In comparison to conventional volumetric curvature attributes, its main improvements and key algorithms introduce multi-frequency components expansion in time-frequency domain and the corresponding multi-scale adaptive differential operator in the wavenumber domain, into the volumetric curvature calculation. This methodology can simultaneously depict seismic multi-scale features in both time and space. Additionally, we use data fusion of volumetric curvatures at various scales to take full advantage of the geologic features and anomalies extracted by curvature measurements at different scales. The 3D MSVC can highlight geologic anomalies and reduce noise at the same time. Thus, it improves the interpretation efficiency of curvature attributes analysis. The 3D MSVC is applied to both land and marine 3D seismic data. The results demonstrate that it can indicate the spatial distribution of reservoirs, detect faults and fracture zones, and identify their multi-scale properties.