UNIPOL气相聚乙烯反应器块料生成热历史研究

本文采用热分析(DSC)的方法对UNIPOL气相流化床聚乙烯反应器块料生成过程所经历的热历史进行了详细测试与对比分析。结果发现,在反应器排产线性低密度聚乙烯LLDPE DFDA-7042时,DSC曲线上出现了多重熔融峰,其一次升温熔融峰值和熔融焓值均高于对应粉料的,表明块料经历了更为复杂的熔融再结晶过程,结晶更为完善;而在排产高密度聚乙烯HDPE DMDA-8007时,DSC曲线上只有一个完整的熔融峰,其一次升温熔融峰值和熔融焓值与对应粉料的基本相同,表明块料未经历复杂的熔融再结晶热历史过程。不同牌号块料经历的热历史不同,反映了其结块机理的不同。使用不同催化剂生产DFDA-7042时产生的块料均经历了复杂的熔融再结晶过程。通过对块料形成过程热历史的追溯,加深了对块料形成机理的认识。     

1,1-二氘代-3,6,9,12-四氧代-1-二十四烷醇的合成

二缩三乙二醇在金属钠存在下与溴代十二烷反应生成3，6，9－三氧代－二十烷醇，收率86％；该醇与氯乙酸甲酯反应生成3，6，9，12－四氧化二十四烷酸甲酯，收率60％，3，6，9，12－四氧代二十四烷酸甲酯与氘代铝锂氢在乙醚中反应生成1，1－二氘代－3，6，9，12－四氧代－1－二十四烷醇，收率95％。     

高压直流连续波光阴极注入器中电子束流发射度研究

 高平均功率自由电子激光研究中，电子束质量是关键。针对高平均功率自由电子激光目标参数，提出了直流高压连续波光阴极注入器，给出了注入器的束流动力学过程。为了降低输出束流横向发射度，采用特殊结构设计的静电加速腔，加速电压1MV，最大加速梯度10MV/m。用PARMELA程序进行了粒子动力学模拟，电子束束团电荷为0.5nC，束团长度10ps时，注入器输出束流归一化发射度均方根值为5.8mm·mrad。     

固载氧化剂在有机合成中的应用

对近15年来主要的固载氧化剂在有机合成中的应用进行了综述。参考文献71篇。     

流动相组成对有机硒手性化合物拆分的影响

 在自制的涂敷型纤维素 三 (3,5 二甲基苯基氨基甲酸酯 ) (CDMPC)手性固定相上拆分了一些结构相似的有机硒手性化合物 ,详细考察了三元流动相对手性拆分的影响 ,并探讨了溶质分子与手性固定相相互作用的模式。实验结果表明 :在二元流动相中加入极少量的质子性改性剂 (醇 )或非质子性改性剂 (乙腈 ) ,可使溶质的保留和手性拆分发生较大的变化。     

Bayesian joint quantile regression for mixed effects models with censoring and errors in covariates

In this paper, we discuss Bayesian joint quantile regression of mixed effects models with censored responses and errors in covariates simultaneously using Markov Chain Monte Carlo method. Under the assumption of asymmetric Laplace error distribution, we establish a Bayesian hierarchical model and derive the posterior distributions of all unknown parameters based on Gibbs sampling algorithm. Three cases including multivariate normal distribution and other two heavy-tailed distributions are considered for fitting random effects of the mixed effects models. Finally, some Monte Carlo simulations are performed and the proposed procedure is illustrated by analyzing a group of AIDS clinical data set.     

Fluorescent Characteristics of Rheumatoid Arthritis Patients Blood Lymphocytes

A fluorescent probe, ABM, aminoderivative of benzanthrone, synthesized in the Department of Organic Chemistry of the Riga Technical University (Latvia), has been successfully used to characterize changes in the structural and functional properties of cell membranes during different pathologies. In the present study the physicochemical properties and the functional activity of the peripheral blood mononuclear cells (lymphocytes—Ly) in patients with rheumatoid arthritis (RA) were studied using the ABM probe. Intensity of the ABM fluorescence in the celi suspension, functional activity of the ly anisotropy of the membranes differ patients with different titres of rheumatoid factor in blood. Patients with seropositive RA had decreased proliferative activity and lower number of iy in blood plasma indicating greater alterations of the immunoregulating processes in these patients as compared to patients with seronegative RA. In the latter the Ly deficiency is compensated to some extent by increased proliferation activity of these cells. The ABM fluorescence intensity correlated not only with membrane anisotropy (r = 0.97, but also with the proliferation activity of the Ly (r = 0.98). The above parameters correlated with the clinical manifestations of the disease. The results indicate that the fluorescent probe ABM is useful for screening the physicochemical status of Ly membranes and the proliferation activity of these cells in RA patients.     

应用Saha方程计算氩等离子体的Hugoniot物态方程

应用Saha模型加Debye-Huckel修正计算氩等离子体的Hugoniot物态方程,温度在10000-30000K之间,压力在0.0133-0.166GPa范围内,非理想参数Γ≈0.38.实验值和理论计算结果符合较好,说明Saha模型加Debye-Huckel修正能较好描述该热力学条件下氩等离子体的热力学行为.     

膜基萃取中钕、钐的传质及界面反应动力学

采用自制聚偏氟乙烯中空纤维膜吕,在HEH／EHP煤油体系不,对钕,钐的萃取及界面反应进行了研究。结果表明,膜器中的萃取反应与液－液萃取相同,可视为准一级反应。考察了料液酸度,萃取剂浓度,钕,钐离子浓度与萃取速率的关系,获得了相应的反应级数,根据界面反应动力学,得到了动力学方程,速率常数及钕,钐的分离系数。