注凝析油开采稠油的地质工艺

在西西伯利亚俄罗斯油田开展了注凝析油开发稠油的研究，现场实验结果表明，注入25%的凝析油，可使其混合液粘度达到原高粘油粘度的1/60，以俄罗斯油田为例，探讨了注凝析油矿场试验的可行性，预测了凝析油的用量和可能产出的油量，并对原油外输提出了一系列更换工艺设备的要求。     

Tb0.3Dy0.7(Fe1-xAlx)1.95合金的结构、磁致伸缩性能和自旋重取向研究

本文系统研究了室温下Tb0.3Dy0.7(Fe1-xAlx)1.95(x=0,0.05,0.1,0.15,0.2,0.25,0.3,0.35)合金中金属Al替代Fe对晶体结构、磁致伸缩、内禀磁致伸缩、各向异性和自旋重取向的影响.结果发现,x＜0.4时,Tb0.3Dy0.7(Fe1-xAlx)1.95完全保持MgCl2立方Laves相结构,晶格常数a随Al含量x的增加而增大.磁致伸缩测量发现,随着替代量x的增多磁致伸缩减小,x＞0.15时超磁致伸缩效应消失;x＜0.15时磁致伸缩在低场下(H≤40kA/m)有小幅增加,高场下迅速减小,而且易趋于饱和,说明添加少量Al有助于减小磁晶各向异性.内禀磁致伸缩λ111随[111]替代量x的增加大幅度降低.穆斯堡尔效应表明,Tb0.3Dy0.7(Fe1-xAlx)1.95合金的易磁化方向随成份和温度在{110}面逐渐偏离了立方晶体的主对称轴,即自旋重取向.室温下,当x=0.15时,Tb0.3Dy0.7(Fe1-xAlx)1.95合金中出现了少量非磁性相;x＞0.15时,合金完全呈顺磁性.     

Measurement and Correlation for Solubility of (S)-(+)-2,2-Dimethyl-cyclopropane Carbox Amide in Different Solvents

1 INTRODUCTION (S)-(+)-2,2-dimethylcyclopropane carbox amide [(+)-DMCPCA, Fig.1] is a key intermediate of Cilas- tatin, an inhibitor of dehydropeptidase-I. As the syner- gist of imipenem (an antibiotic drug), cilastatin is widely used in clinical applications and has prosper- ous prospects[1]. In industrial manufacture[2―6], as the optical intermediate, the chemical and optical purity of (+)-DMCPCA would affect the quality of cilastatin. So, the separation and purification are impo…     

In vitro comparison of hepatic metabolism of 9cis-11 trans and 10trans-12cis isomers of CLA in the rat

Hepatic metabolism of the two main isomers of CLA (9cis-11 trans, 10trans-12cisCb>18∶2b>) was compared to that of oleic acid (representative of the main plasma FA) in 16 rats by using the in vitro method of incubated liver slices. Liver tissue samples were incubated at 37°C for 17h under an atmosphere of 95% Ob>2b>/5%COb>2b> in a medium supplemented with 0.75 mM of FA mixture (representative of circulating nonesterified FA) and with 55 μM [1-¹⁴C]9cis-11 trans Cb>18∶2b>, [1-¹⁴C]10trans-12cis Cb>18∶2b>, or [1-¹⁴C]oleate. The uptake of CLA by hepatocytes was similar for both isomers (9%) and was three times higher (P<0.01) than for oleate (2.6%). The rate of CLA isomer oxidation was two times higher (49 and 40% of incorporated amounts of 9cis-11 trans and 10trans-12 cis, respectively) than that of oleate (P<0.01). Total oxidation of oleate and CLA isomers into [¹⁴COb>2b>] was low (2 to 7% of total oxidized FA) compared to the partial oxidation (93 to 98%) leading to the production of [¹⁴C] acid-soluble products. CLA isoemrs escaping from catabolism were both highly desaturated (26.7 and 26.8%) into conjugated 18∶3. Oleate and CLA isomers were mainly esterified into neutral lipids (30%). They were slowly secreted as parts of VLDL particles (<0.4% of FA incorporated into cells), the extent of secretion of oleate and of 10trans-12 cis being 2.2-fold higher than that of 9cis-11 trans (P<0.02). In conclusion, this study clearly showed that both CLA isomers were highly catabolized by hepatocytes, reducing their availability for peripheral tissues. Moreover, more than 25% of CLA escaping from catabolism was converted into conjugated 18∶3, the biological properties of which remain to be elucidated.     

Effects of conjugated linoleic acid isomers on the hepatic microsomal desaturation activities in vitro

The influence of individual conjugated linoleic acid (CLA) isomers on the Δ6 desaturation of linoleic and α-linolenic acids and on the Δ9 desaturation of stearic acid was investigated in vitro, using rat liver microsomes. The Δ6 desaturation of 18∶2n−6 was decreased from 23 to 38% when the ratio of 9cis,11trans-18∶2 to 18∶2n−6 increased from 0.5 to 2. The compound 10trans,12cis-18∶2 exhibited a similar effect only at the highest concentration. The Δ6 desaturation of α-linolenic acid was slightly affected by the presence of CLA isomers. The sole isomer to induce an inhibitory effect on the Δ9 desaturation of stearic acid was 10trans,12cis-18∶2.     

轻型商用车驾驶室声场特性分析

建立了驾驶室的三维有限元模型,并进行了结构模态分析;建立了驾驶室声学有限元模型以及声固耦合模型,通过对其声学模态及耦合模态进行分析,对驾驶室声场有了初步了解.对驾驶室进行谐响应分析,得到位移结果文件,为后续声场分析提供了边界条件。利用Sysnoise声学软件计算驾驶员耳旁声压曲线,并进行声学灵敏度分析,深入研究引起驾驶室内噪声的原因。采用边界元法分析了驾驶室各板件声学贡献,确定了地板为声学贡献量最大的板件。在以上研究的基础上,通过加强地板刚度对驾驶室进行修改。