软模板法合成多级孔沸石分子筛及其催化性能研究进展

详细介绍了软模板法合成多级孔沸石分子筛及其催化性能。合成多级孔沸石分子筛的软模板主要包括两种类型,一种是含多季铵基团的烷基季铵盐;另一种是双亲有机硅表面活性剂。对采用这两种表面活性剂合成多级孔沸石分子筛的方法以及得到的材料结构特性进行了综述。进一步讨论了这两种方法得到的分子筛的催化性能。关于这些材料的催化性能研究主要有三方面内容:有机大分子化合物合成的活性和选择性,生物质催化热解特性和大分子化合物合成中抗积炭失活性能。     

近熔点挤出等规聚丙烯的微结构与力学性能的关系

分别在近熔点附近（167℃）和完全熔融温度（190℃）下挤出制备等规聚丙烯（iPP）片材。拉伸试验结果表明：在167℃挤出的iPP,其屈服强度比在190℃时挤出的提高了15.8%;拉伸强度和杨氏模量均有一定程度的提高。采用二维广角X射线衍射（2D-WAXD）、示差扫描量热法（DSC）和扫描电子显微镜（SEM）对微结构进行表征,并讨论了微结构与力学性能的关系。     

复杂条件下采空区积水探放技术研究

针对东庞矿21004工作面煤层瓦斯含量大且松软、采空区积水量大、水位高差大、疏放水难度较大的问题,通过对其水文、地质及瓦斯条件进行综合分析,研究制订了一套安全可行的疏放水方案,有效的将工作面积水疏放,保证上巷安全掘进,为今后复杂条件下采空区积水的探放提供经验。     

Development and Study of Applications Combining Nanopowder Imprint Lithography and Array-Type UV-Curing Technology for Micro-Lens Molding

This study developed creative imprinting technology, combining nano-imprint lithography and array-type UV-curing technology. It used nanopowders as the method to transmit imprint force, and integrated technical features, such as soft lithography, light-curing resistant and gas-assisted imprint technology, in order to study the development of technological processes of micro-lens array manufacturing, and mature the application and technology of nano-imprinting. According to research results, SUS 304 stainless steel sheet with a micro-hole array could be smoothly fabricated into an original micro-lens array mold upon gas-assisted micro-hot embossing. At the same time, a micro-lens array structure with a complementary external form could be precisely remolded and reproduced by PDMS. Complete molding of micro-lens could be effectively achieved by combining imprints of gas-assisted lithography developed in this study, and even UV-NIL. The effective imprinting area and reproducibility of transfer printing could be greatly improved when a micro-lens contacts perfectly with a substrate surface. Moreover, since PDMS soft molds have short remolding times, and are easily feathered during manufacturing, production costs could be effectively reduced through features such as, low surface free energy, resistant to adhering to the mold during imprinting, and collocation of gas-assisted nanopowder imprinting of micro-structural processes.     

Electromagnetic Field-Aided Magnetic Soft Mold Reverse Imprinting Technology Applied in Microstructure Replication

This paper proposes an advanced microstructure embossing replication technology that combines an electromagnetic-field-aided magnetic soft mold and a reverse imprinting technology to replicate microstructure. The main advantage of this technology is low pressure, low cost, and quick and easy forming. The entire imprinting process can be completed at room temperature using a ultraviolet (UV) curing technique. This study applied a compound casting technique to fabricate a magnetic poly(dimethylsiloxane) (PDMS) soft mold, with an electromagnetic chuck for even imprinting pressure, and reverse imprinting molding technology. Microstructure cavity of the mold was fully filled with photoresist before imprint replication, and improved microstructure transfer ratio. Examination of the results showed that, the magnetic PDMS soft mold integrated electromagnetic-field-aided reverse imprinting process developed by this study, can successfully replicate microstructure at room temperature, low pressure, and avoid deformation and residual stress problems due to heating and cooling.     

提纯回用氢网络的夹点变化规律

在氢系统中引入提纯装置可以经济有效地提高氢气的回用率,是氢系统中广泛采用的方法。但引入提纯回用过程可能会影响氢系统的夹点位置,还可能使氢系统出现多夹点。由于夹点对系统性能的分析与优化具有极其重要的作用,而夹点位置的变化则会影响到用氢过程的匹配。在氢夹点技术的基础上,通过图示分析法,研究了在不同提纯产品浓度下提纯回用过程的夹点变化规律和趋势,对于考虑提纯回用的氢网络集成具有重要的意义。     

HEAT AND MASS TRANSFER IN STAGNATION-POINT FLOW OF A POLAR FLUID TOWARDS A STRETCHING SURFACE IN POROUS MEDIA IN THE PRESENCE OF SORET,DUFOUR AND CHEMICAL REACTION EFFECTS

This work is focused on the numerical solution of steady boundary-layer stagnation-point flow of a polar fluid towards a stretching surface embedded in porous media in the presence of the effects of Soret and Dufour numbers and first-order homogeneous chemical reaction. The governing boundary-layer equations of the problem are formulated and transformed into a self-similar form. The obtained equations are solved numerically by an efficient, iterative, tri-diagonal, implicit finite-difference method. Both assisting and opposing flow conditions are considered. Comparisons of the present numerical results with previously published work under limiting cases are performed and found to be in excellent agreement. Representative results for the fluid velocity, angular velocity, temperature, and solute concentration profiles as well as the local heat and mass transfer rates for various values of the physical parameters are displayed in both graphical and tabular forms.     

Cloud Point Extraction of Parabens Using Non-Ionic Surfactant with Cylodextrin Functionalized Ionic Liquid as a Modifier

A cloud point extraction (CPE) process using non-ionic surfactant (DC193C) to extract selected paraben compounds from water samples was investigated using reversed phase high performance liquid chromatography (RP-HPLC). The CPE process with the presence of β-cyclodextrin (βCD) functionalized ionic liquid as a modifier (CPE-DC193C-βCD-IL) is a new extraction technique that has been applied on the optimization of parameters, i.e., pH, βCD-IL concentration and phase volume ratio. This CPE-DC193C-βCD-IL method is facilitated at 30 °C, showing great losses of water content in the surfactant-rich phase, resulting in a high pre-concentration factor and high distribution coefficient. The developed method CPE-DC193C-βCD-IL did show enhanced properties compared to the CPE method without the modifier (CPE-DC193C). The developed method of CPE-DC193C-βCD-IL gives an excellent performance on the detection of parabens from water samples with the limit of detection falling in the range of 0.013–0.038 μg mL⁻¹. Finally, the inclusion complex formation, hydrogen bonding, and π–π interaction between the βCD-IL, benzyl paraben (ArP), and DC 193C were proven using ¹H NMR and 2D NOESY spectroscopy.     

三甘醇脱水效果的影响因素分析

为了提高三甘醇脱水的脱水效果,有必要分析各种因素对脱水效果的影响。利用HYSYS软件对处理量为100×10^4Nm^3／d的三甘醇脱水装置进行模拟计算,分析结果显示吸收塔的吸收温度越低、三甘醇贫液浓度越高、三甘醇循环量越大、吸收塔塔板数越多,则脱水效果越好,外输干气水露点越低。‘