应用刚塑性有限单元法研究静液挤压的工艺参数

应用刚塑性有限单元法对静液挤压圆棒时的主要工艺参数——变形量、模角和摩擦系数对变形过程的影响进行了分析。考虑了材料的加工硬化,经计算与实验比较表明了两者吻合良好。     

尿液中可卡因及其代谢物的检测研究

使用一种简便而快速的电喷雾-液质联用方法对尿液中可卡因和苯甲酰芽子碱的定性定量分析进行实验研究.结果表明在8.325×10-8~3.294×10-6mol/L的范围内呈线性关系.尿液样品用固相萃取柱净化,无需衍生化就可以直接进样分析,并使用等梯度分离条件和选择离子模式进行数据采集,结果满意.     

液环式氯气泵排气口始角的确定

作者在分析现有液环式氯气泵结构参数的基础上,以理论公式计算排气口始角Φ_2,并提出如何确定Φ_2值的几点看法。     

丙酮—正丙醇二元系等压汽液平衡研究

本文以一种循环式平衡釜,测定了在730毫米汞柱压力下的丙酮——正丙醇体系的汽液平衡数据。用Herrington提出的积分法和Van Ness等推荐的点校验法,对所测的实验数据进行了恒压下热力学一致性校验。并用Van Laar、Margules和Wilson方程进行了热力学关联,三方程拟合精度都好。     

实验型液固萃取器的探索

通过对恒压滴液漏斗提取装置与索氏提取器在相同条件下的提取效率进行对比试验，结果表明：恒压滴液漏斗提取装置与索氏提取器相比具有提取效率高，部件不易损坏，加料和排液易操作，装置的各个部件用途广等优点，因此，它是一种较为理想的实验型液固苹取器。     

Solid-Liquid State Bonding of Si3N4 Ceramics with Ceramic-Modified Brazing Alloy

Solid-liquid state bonding of Si3N4 ceramics with TiN-modified Ag-Cu-Ti brazing alloy was used to enhance joint strength. The effects of the TiN particles on the microstructures, interfacial reactions, and room-temperature properties of the joints were investigated. The results show that the TiN particles are generally well dispersed in the Ag-Cu eutectic base and the interface between them is both clean and compact. Changes in the TiN volume fractions from 0 to 20% exert no noticeable effect on the interfacial reaction between Ag-Cu-Ti and the substrates. Other bonding parameters being constant, the TiN volume fraction in the filler material plays a key role in the joint properties. For TiN volume fractions below 20%, the joints are reinforced, especially joints with 5% and 20% TiN. The average shearing strength of joints with 5% TiN is 200.8 MPa, 30% higher than that of joints with no TiN (154.1 MPa). However, for TiN volumes fractions above 20%, the joint strengths decrease.     

四甲苯物系固液平衡测定

利用差示扫描量热法,测定均四甲苯+连四甲苯、均四甲苯+偏四甲苯和偏四甲苯+连四甲苯3个二元体系及均四甲苯+连四甲苯+偏四甲苯三元体系的固液平衡数据,并用Ott方程进行数据关联,绘制以上各体系的二元及三元相图。结果表明,所测物系均为简单低共熔物系。