碳纳米管担载纳米银及其电催化甲醇氧化的研究

以水溶性离聚物聚（苯乙烯磺酸钠-co-丙烯酸）（PSA）接枝多壁碳纳米管为模板,制备了碳纳米管担载纳米银（AgNP@MWNT）,研究了在碱性条件下对甲醇氧化的电催化作用。结果表明接枝在MWNT表面的离聚物PSA有效地控制了AgNP在MWNT表面以2～4nm的尺寸均匀担载,促进了AgNP与MWNT之间的界面相互作用。制备的Ag@MWNT在水中能够稳定地均匀分散,在碱性条件下可有效地电催化甲醇氧化,抗甲醇中毒性能良好。     

下二门地区重矿物特征与物源分析

探索多物源储集砂体的物源对油气勘探与开发具有重要的意义.重矿物分析是区分不同物源体系的重要手段之一.利用泌阳凹陷下二门地区57口钻井的重矿物测试资料,采用重矿物组合类型、ZTR指数分析等方法判别了下二门地区沉积物物源方向.研究表明,下二门地区存在3支物源,分别为东部下二门物源、东南部梨树凹物源和北部侯庄物源.     

适应高速移动的一种无线传输技术分析

针对高速移动性,特别是在高速铁路的背景下,分析了高速移动条件下信道的特性,提出在单载波频域均衡技术(SC-FDE)的基础上,设计合理的帧结构对抗快速时变信道的影响,加入空间分集和频率分集获得分集增益,从而进一步对抗衰落。仿真结果表明,采用SC-FDE技术能够有效地支持分集接收,解决高速移动带来的信道快衰落问题,提高高速移动环境中的通信质量。     

煤矿高温作业防护措施探讨

介绍我国的矿井高温现状,阐述矿下高温对工人身体健康的影响.引入WBGT指数的高温作业分级标准对矿井高温进行评价,并参照此标准建议矿方除了采用人工制冷措施之外,应结合有利条件,对工人采取相应的高温防护措施.     

Studies on mechanical properties of dispersing intercalated silane montmorillonite in low density polyethylene matrix

In order to understand and improve these soft and weak mechanical properties of Low Density Polyethylene (LDPE), we add a silane modifier (Nanocor I.31PS) Montmorillonite (MMT) as reinforcement material, inserted with two kinds of different surfactant (thermoplastic polyolefin elastomers (TPO) or Maleic Anhydride (MA)), the layer distance and hydrophobia are all best; to join the pieces of LDPE together, making it possess polarization. After that, we use a Plastograph-Mixer by the twin-screw mixed method to obtain standard shaped specimens of Polymer-Clay Nanocomposites (PCN) to prepare HDPE/MMT nanocomposite pellets. By adding the different weight percentages (1, 3, and 5 wt.%) of MMT, and 2:1 ratio of MA (or TPO) and MMT, the layer distance of MMT and mechanical property of nanocomposites were investigated.The chemical structure and polymer morphology of these as-synthesized PCN specimens were characterized by wide-angle powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, we prepare these experimental specimens in order to probe into its mechanical properties. These tests used are: layer distance of PCN, tensile, impact, shore-hardness, wearing tests, and so on.In addition, we use XRD to make the characterization analysis, compare it to scatter and layer-distance. It is found that when increasing the TPO into the MMT, layer-distance at 1 wt.% MMT increases from 2.11 nm to 3.14 nm.It is found that these specimens that graft the TPO have the following results: In the tensile test, the MMT weight percentage of 1 wt.% has the best result, increased by 3.08%. In the impact test, the MMT 3 wt.% strengthens by 11.53%. In the hardness test, the MMT 5 wt.% strengthens the effect by 2.60%. In the wearing tests, the MMT 5 wt.% strengthens the effect by 6.98%.In addition, the specimens that graft the MA have the following results: In the tensile test, the MMT 1 wt.% strengthens by 5.39%. In the impact test, the MMT 3 wt.% strengthens by 19.71%. In the hardness test, the MMT 5 wt.% strengthens by 10.85%. In the wearing tests, the MMT 5 wt.% strengthens the effect by 44.19%.     

Synergistic manipulation of micro-nanostructures and composition: anatase/rutile mixed-phase TiO2 hollow micro-nanospheres with hierarchical mesopores for photovoltaic and photocatalytic applications

The construction of nanocrystals with controllable composition and desirable micro-nanostructures is a well-known challenge. A combination of favorable composition and optimized micro-nanostructures can enhance the performance of a material significantly. Using TiO(2) as an example, we demonstrate here a facile approach to prepare anatase/rutile mixed-phase TiO(2) hollow micro-nanospheres with hierarchical mesopores. Our strategy relies on polymer-assisted assembly of ～ 5 nm nano-building blocks into three-dimensional hierarchical hollow micro-nanospheres in a mixed alcohol-water solution. This superior micro-nanostructure endows the sample with hierarchical mesopores and a high surface area of 106 m(2) g(-1). We also show that, due to the synergetic effects of the mixed-phase composition and the micro-nanostructures, the sample exhibited significantly improved photovoltaic performance and similar photocatalytic performance compared with the commercial Degussa P25. These results suggested that our sample has great potential for future photovoltaic and photocatalytic applications.     

可溶性聚吡咯甲烯衍生物的制备与表征

采用逐步分子设计思想,制备了一种溶解性、成膜性优良的聚{（3-丙酰基）吡咯-[2,5-二（对十四烷氧基苯甲烯）]}（PPPDTBE）,并对PPPDTBE的分子结构和性能进行表征与分析。热失重曲线显示,PPPDTBE的热分解过程分为两个阶段,分别对应丙酰基和对十四烷氧基苯基的分解。紫外-可见吸收光谱表明,PPPDTBE氯...     

同步发电机励磁的神经网络控制

提出了一种改进的神经网络学习算法，对拟合静态模型，其误差的收敛阶可达１．６１８，基于同步发电机可控硅励磁自并励非线性模型的仿真研究表明，该算法控制性能优良。     

基于圆柱源理论模型的U型埋管换热器的模拟研究

分析了圆柱热源(热汇)理论模型,运用圆柱源理论对太阳能-土壤源联合运行热泵系统进行连续20d运行的状况进行模拟,得出联合运行模式较单独土壤源运行模式节能8%~10%,可为圆柱源理论模型应用和太阳能-土壤源热泵运行模式的选择提供参考。引入“负荷集合”思想对圆柱热源(热汇)理论模型进行改进,使其适合于对土壤源热泵的全年运行进行模拟,模拟过程更为快捷。     

西藏4kW风/光互补发电系统优化设计

根据在西藏一个实际村庄的风、光资源和负载特性，利用美国可再生能源实验室开发的混合发电系统性能模拟软件“Ｈｙｂｒｉｄ２”，模拟并比较了在该村庄利用风／蓄、风／光／蓄、光／蓄系统解决其基本生活用电的技术经济可行性。模拟结果指出，风／光／蓄混合发电系统是该村庄最适合的发电系统。文中还对风／光／蓄发电系统进行了优化设计。通过改变风资源数据，利用“Ｈｙｂｒｉｄ２”模拟和优化设计不同风速时的发电系统，结果显示在西藏那曲地区利用风／光混合发电系统解决无电村庄居民的供电问题是可行的。