高压下氢化锂晶体中的离子间力与结合能公式的原子分子设计

本文提出一种利用材料Hugoniot数据研究高压下离子晶体中微观离子状态及其离子间排斥作用势的新方法。对氢化锂晶体进行研究时,我们得到Li~+和H~-离子之间排斥作用势函数,结果表明文献〔1〕中提出的离子压缩效应具有客观性。     

季铵盐-α-羟基异丁酸体系中稀土的柱上萃取层析

本文报导稀土元素的柱上萃取层析的新体系,固定相为季铵盐(N-263),流动相为α-HIBA-LiNO_3溶液。验证了纸上层析和柱上层析的关系,测定了相邻元素的分离因数在1.8至2.9之间,并在阶梯式变更LiNO_2-α-HIBA浓度的情况下成功地分离了总量为380微克的14个稀土元素,所用柱子的尺寸为φ3.3×125mm。     

预氧化对石油焦物理活化的作用

Activated carbon was prepared from pretreated petroleum coke by the vapor activation. The effect of pretreatment process on activation performance of coke was studied by low temperature N₂ adsorbtion-desorption and XRD. The results show that when the temperature is increased, coke loses volatiles with obvious volume contraction, resulting in decline in coke activation performance, the activated carbon obtained from carbonization coke after treatment at 650 ℃ is with a higher degree of graphitization, while pores below 1.5nm are disappeared. The oxidation pretreatment would modify the micro-structure of the coke and make the graphitization degree of coke decline. The activation performance of coke is improved greatly by air-oxidation pretreatment due to the formation of a mass of pore in coke with specific surface area about 146 m²·g^-1, and the surface area of activated carbon is considerably increased. The specific surface area of the activated carbon from air-oxidated coke reached 499m²·g^-1. Nitric acid pretreatment also had effect on improving activating performance of the petroleum coke.     

带红系增强子的人βE-珠蛋白基因在转基因小鼠中的表达

本文以我国人中常见的异常血红蛋白E(HbE,β26Glu→Lys,G→A)的β珠蛋白基因为外源基因,用显微注射法制备了人βE-基因的转基因小鼠系。得到的一只整合有16拷贝5′HS2βE重组体的转基因小鼠具有典型的转基因小鼠特征。证实人βE-基因在转基因鼠中的高水平表达需有红系特异性增强子(5′HS2)的存在;说明5′HS2结构对异常珠蛋白基因(βE-)在转基因鼠中的表达也具有明显的增强作用。单一位点整合过多5′HS2βE拷贝平均表达水平(12.1％)明显低于较少拷贝整合的平均表达水平(79.7％),对其发生机制进行了讨论。βE-珠蛋白肽链在转基因鼠中可形成新的血红蛋白四聚体。     

高压下铁、镍、铜的电阻随压力的变化规律

利用我们建立的实验方法,分别测量了铁、镍、铜的电阻随压力的变化规律,压力达42GPa.在低压区所得结果与国外所报道的符合得相当好.在高压区还首次观测到铁(32—34GPa)、镍(28.8GPa)电阻变化的异常现象.     

氢氧混合物爆燃转变为爆轰的时间测量

本文用自制的红外探测仪,测量了氢氧混合物在爆炸激波管中经电火花点火后,由爆燃转变为爆轰(DDT)的时间。为研究可燃物的爆炸特性提供了一种简易的测量方法。