高校科技产业发展模式研究

高等院校在科技研究方面具有明显优势 ,在如何将高校的科技研究优势转化为现实生产力方面 ,本文通过对比分析高校科技产业模式 ,探讨了在市场经济条件下高校应选择的合理产业模式 ,提出高校科技产业发展的思路     

Mathematical Model of Fluid Flow and Solidification in Mold Region of Continuous Slab Casting

To simulate the phenomena in the mold region of continuous casting by coupling fluid flow and solidification, a three-dimensional mathematical model has been developed based on the K-ε turbulence equations and the SIMPLER algorithm. A pseudo source term was introduced into the energy equation to account for the latent heat and kinetic energy. The fluid flow in the mushy zone was calculated by defining the fluid viscosity as a function of the solid fraction in the mushy zone. Fine meshes in the solid region improve convergence and reduce iteration time. Comparison of the fluid flow and temperature distribution with and without solidification shows that although the solid shell in the mold is thin, it still greatly affects the flow pattern. The numerical results obtained provide details of the fluid flow and solidification phenomena which can be used to optimize the nozzle structure and other process parameters in continuous casting.     

盐湖地区侵蚀性离子在混凝土中的扩散及其相互作用

采用化学分析方法探索了盐湖环境的Na+,K+,Mg2 +,SO42 - 和Cl- 离子在混凝土和钢筋混凝土结构中的扩散规律 ,并用XRD ,DTA TG和SEM EDAX方法研究了侵蚀性离子与混凝土之间的相互作用机理 .结果表明 ,Mg2 +和SO42 - 离子在混凝土中呈现出不同的分布规律 ,Na+,K+和Cl- 离子的扩散速度大小顺序为 :VCl- >VNa+ ≈VK+ .盐湖侵蚀性离子渗入混凝土后 ,一部分吸附于孔隙内表面 ,结晶成食盐NaCl和光卤石KCl·MgCl2 ·6H2 O ;另一部分与水化产物发生化学腐蚀 ,形成石膏CaSO4·2H2 O ,南极石CaCl2 ·6H2 O和氢氧化镁Mg(OH) 2 ;还有一部分与CSH凝胶发生 3种相互作用 :吸附于凝胶粒子表面 ,进入凝胶结构形成含水硅酸钙镁 (C1 -xMx) 1 .1 5- 1 .70 SH(x =0 .2 2～ 0 .39)和碱硅凝胶 (C1 -xNx) 1 .85- 1 .60SH(x=0 .39～ 0 .63) .     

半线性椭圆边值问题的一般迭代法

针对一类半线性椭圆边值问题，给出一种一般迭代数值方法，收敛性定理，误差估计，最后给出一算例，证明该方法是可行的。     

Static and Metadynamic Recrystallization of Low Carbon Steels During Mechanical Deformation

Static and metadynamic recrystallization models were developed with the coefficients determined by multiple nonlinear regression analyses to describe microstructure evolution in low carbon steels.The effects of initial grain size, deformation temperature, strain, and strain rate on the austenitic recrystallized volume fraction and grain size were studied using a Gleeble machine. The results show that deformation reduces the grain size when the recrystallized volume fraction is large. The static recrystallized volume fraction increases with increasing deformation temperature, strain, and strain rate, and decreasing initial grain size. The grain size during metadynamic recrystallization is independent of the deformation strain and the initial grain size. The recrystallized volume fraction, the grain size, and the grown grain size calculated by the correlations are consistent with the measured values.     

一类具有非线性接触率的种群力学流行病模型分析

对一类具有非线性接触率的种群力学流行病模型，分析了模型平衡点的稳定性，得到了疾病消除平衡点和疾病传染平衡点全局渐近稳定的充分条件，结果表明控制人口增长有利于预防与控制流行病的蔓延。     

分割小包装冷却肉的保鲜技术

采用乳球菌肽(Nisin)、GNa液、有机酸等复合保鲜剂，对分割鲜猪肉进行保鲜处理，在0～4 ℃冷藏条件下结合真空包装，研究其保鲜效果.结果表明：多种保鲜剂的配合使用能明显增长分割鲜猪肉的保鲜时间，用Nisin 0.05%+乙酸0.2%+乳酸0.1%+抗坏血酸3.0%复合剂处理样品并结合真空包装为最佳保鲜方案.     

城市单路口交通的两级模糊控制及其仿真

在Ｐａｐｐｉｓ法的基础上,提出城市单路口交通的两级模糊控制方法,计算机仿真表明,其结果令人满意。     

内坐标形式的相互作用两体系的振转动能算符

利用角动量方法推导了一种新的内坐标形式的相互作用两个体系的振动能算符。同时对该逄法的应用进行了讨论。     

辽东半岛的幔源He渗漏

研究了辽东半岛温泉气体的Ｈｅ浓度和Ｈｅ同位素的组成特征。＾３Ｈｅ／＾４Ｈｅ值分布于０．１４－０．７２Ｒａ之间,Ｈｅ同位素组成与Ｈｅ浓度和＾４Ｈ３／＾２０Ｎ比值呈现线性相关,表明有少量地幔Ｈｅ抵达地表。温泉气体的＾３Ｈｅ／＾４Ｈｅ值与研究区的大地热流呈现相似的空间分布特征,说明两者具有一定的成因关系。