谈谈C5的综合利用

本文简单地介绍了C5的产量和现状。主要讨论了C5综合利用，其中包括C5生产TAME、石油树脂、叔戊醇、加氢制戊烷、在超强酸条件合成金刚烷和某厂利用C5流程图。C5资源的合理利用不仅是有效利用石油资源的组成部分，也是改善产品结构，提高产品质量、增加企业效益的重要途径之一。     

Synthesis and surface characterization of poly(methyl methacrylate)‐block‐polydimethylsiloxane copolymers from macroazoinitiator

Poly(methyl methyacrylate)‐block‐polydimethylsiloxane (PMMA‐b‐PDMS) copolymers with various compositions were synthesized with PDMS‐containing macroazoinitiator (MAI), which was first prepared by a facile one‐step method in our lab. Results from the characterizations of X‐ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM) showed that the copolymer films took on a gradient of composition and more PDMS segments enriched at the film surfaces, which then resulted in the low surface free energy and little microphase separation at the film surfaces. By contrast, transmission electron microscopy (TEM) analysis demonstrated that distinct microphase separation occurred in bulk. Slight crosslinking of the block copolymers led to much steady morphology and more distinct microphase separation, in particularly for copolymers with low content of PDMS. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Structure and properties of nitrile rubber (NBR)–clay nanocomposites by co‐coagulating NBR latex and clay aqueous suspension

Nitrile rubber (NBR)–clay nanocomposites were prepared by co‐coagulating the NBR latex and clay aqueous suspension. Transmission electron microscopy showed that the silicate layers of clay were dispersed in the NBR matrix at the nano level and had a planar orientation. X‐ray diffraction indicated that there were some nonexfoliated silicate layers in the NBR–clay nanocomposites. Stress–strain curves showed that the silicate layers generated evident reinforcement, modulus, and tensile strength of the NBR–clay nanocomposites, which were significantly improved with an increase in the amount of clay, and strain‐at‐break was higher than that of the gum NBR vulcanizate when the amount of clay was more than 5 phr. The NBR–clay nanocomposites exhibited an excellent gas barrier property; the reduction in gas permeability in the NBR–clay nanocomposites can be described by Nielsen's model. Compared with gum NBR vulcanizate, the oxygen index of the NBR–clay nanocomposites increased slightly. The feasibility of controlling rubber flammability via the nanocomposite approach needs to be evaluated further. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3855–3858, 2003     

新农村建设规划过程中的问题与对策探析——以都昌县新农村建设为例

建设社会主义新农村,要坚持规划先行,在当前新农村建设的过程中,合理地进行村庄建设规划具有重要的意义。本文就都昌县目前农村建设的现状及新农村建设规划过程中出现的相关问题进行探析,并对都昌县新农村建设提出了可行性的对策。     

循环经济在赣州矿产资源开发与管理中的研究

如何利用赣州矿产资源优势发展本地经济,节约资源开采,充分利用现有资源,实现资源的循环利用,保持生态环境的良好发展具有重要意义。本文分析介绍了循环经济、赣州矿产资源及开发利用现状,并提出了实现矿业循环经济的具体措施。     

自激多谐振荡器的电路仿真与应用

本文着重介绍了自激多谐振荡器的电路仿真过程。首先阐明了对称的自激多谐振荡器的工作原理;其次应用电路仿真软件Multisim10对自激多谐振荡器进行了简捷的仿真分析;最后以脉冲信号发生器为例说明了自激多谐振荡器的应用问题。     

Effect of puerarin on the P13K pathway for glucose transportation and insulin signal transduction in adipocytes

To explore the effect of puerarin on insulin receptor (IR), insulin receptor substrate-1 (IRS-1) and protein expression of protein kinase B(PKB) in the P13K pathway of the glucose consumption, transportation and insulin signal transduction in 3T3-L1 adipocytes with insulin resistance. The insulin resistance 3T3-L1 adipocytes model was established by free fatty acid induction. The model cells were managed with puerarin in different concentrations. Glucose consumption was detected with glucose oxidase method, glucose transportation rate was determined by 2-deoxy-3H glucose ingesting method, and the IR, IRS-1 and PKB expression were determined by Western blot. Glucose consumption and transportation were significantly decreased in the model adipocytes, but increased after treated with puerarin (P<0.01). Moreover, the level of tyrosine phosphorylation of IR subunit β was higher in the puerarin treated groups, and that of IRS-1 was higher in the group treated with low dose puerarin than that in the model group. The 3T3-L1 adipocytes of insulin resistance model could be induced by free fatty acid successfully, puerarin could promote the glucose utilization in them to alleviate the insulin resistance, which may be related with the action in advancing the tyrosine phosphorylation of IR and IRS-1.     

核电三级设计计划编制分析

核电作为安全、稳定、高效的清洁能源,在世界范围内近年来呈现出快速发展的趋势。目前国家全力以赴推进三代核电建设,因为设计是建设的龙头,因此制定一个科学的、详尽的、切实可行的三级设计计划,对核电站的设计、乃至整个建设工作非常重要和必要。对采购、施工、调试均有举足轻重的影响。     

对高职大学生心理危机干预工作的思考

随着社会的发展,大学生心理危机干预工作日显重要。文章分析了大学生心理危机的几大影响因素,进而从完善心理健康工作领导机制,切实加强心理健康教育,强化心理危机预警机制,及早有效实施心理危机干预,落实心理危机跟踪反馈机制等几个方面阐述了高职大学生心理危机干预工作,对有效地控制学生心理危机事件,减少因学生心理危机造成的生命损失,促进校园和谐稳定有着积极作用。     

影响我国外汇储备适度规模因素的实证分析

针对当前世界经济现状及我国面对的国际经济环境,就我国当前的外汇储备规模相对过大这一现实问题进行了研究.在对我国外汇储备规模的影响因素进行实证研究中发现,从其影响因素着手加强我国外汇储备的管理,可提高其使用效率.运用统计软件Eviews5.O设计影响因素回归模型,就我国外汇储备规模的影响因素的统计数据进行定量回归分析并结合实际情况进行了理论分析.从实证角度揭示中国外汇储备的适度规模,从而确定影响我国外汇储备规模的主次因素,最后得出了相应结论.