提高等离子体裂解煤制乙炔收率的方案研究

将反应体系的温度升高到升华点以上 ,是提高等离子体裂解煤制乙炔收率的必由之路 .采用最小自由能方法研究了煤的 C- H- O热力学平衡体系 ,在此基础上提出了一种以煤层气甲烷为冷却剂的等离子体裂解煤制乙炔方案 ,初始反应体系的温度在 40 0 0 K以上 .理论的计算和分析结果表明 ,这种方案可获得较高的乙炔收率 ,而单位质量乙炔的比能耗很低 ,具有很好的经济效益和环境效益 .     

湿法腈纶生产的含腈废水处理实验研究

采用不同方法对湿法腈纶废水进行预处理，比较了它们的处理效果和特点。研究中使用的菌种预处理方法达到了理想的效果，废水中大分子有机污染物被迅速、高效地分解为挥发性脂肪酸和氨氮等，为后续的接触氧化以及反硝化创造了良好的条件，COD和TKN的总去除率分别为92％和85％，最终出水达到或优于行业二级排放标准。     

高聚合度聚氯乙烯的加工性能

本文对高聚合度聚氯乙烯(H-PVC)的发展及其优异的物理机械性能作了简要介绍;着重分析了H-PVC的加工性能和表征方法,并讨论了分子特性和颗料特性及加工组成、加工条件对加工性能的影响,提出了改进H-PVC加工性能的方法。     

不饱和酸结构对不饱和聚酯树脂固化行为的影响

通过IR分析了用顺酐和反酸与聚酯合成不饱和聚酯树脂的反应机理,讨论了二种树脂体系固化放热曲线不同的原因。     

On the nature of the active state of silver during catalytic oxidation of methanol

Under the applied high reaction temperatures (900 K) the Ag surface is restructured and a tightly held oxygen species is formed on the surface (O) apart from O atoms dissolved in the bulk (O). Methanol oxidation to formaldehyde proceeds through this O species as demonstrated by application of a variety of spectroscopic techniques.     

Oxidative coupling of methane on silver catalysts

Bulk silver catalysts were found to be active for the oxidative coupling of methane to ethane and ethylene if operated under oxygen-limited conditions at atmospheric pressure and at temperatures above 1020 K. The addition of small amounts of sodium phosphate as promoter increases markedly the C₂ selectivity (to values above 90%) and yield (>10%) by efficient suppression of reaction steps leading to total oxidation. Further improvement of the yields might be achieved by more appropriate reactor design.     

Estimation of future water resources of Xiangjiang River Basin with VIC model under multiple climate scenarios

Variation trends of water resources in the Xiangjiang River Basin over the coming decades have been investigated using the variable infiltration capacity(VIC) model and 14 general circulation models'(GCMs') projections under the representative concentration pathway(RCP4.5) scenario. Results show that the Xiangjiang River Basin will probably experience temperature rises during the period from 2021 to2050, with precipitation decrease in the 2020 s and increase in the 2030 s. The VIC model performs well for monthly discharge simulations with better performance for hydrometric stations on the main stream of the Xiangjiang River than for tributary catchments. The simulated annual discharges are significantly correlated to the recorded annual discharges for all the eight selected target stations. The Xiangjiang River Basin may experience water shortages induced by climate change. Annual water resources of the Xiangjiang River Basin over the period from 2021 to 2050 are projected to decrease by 2.76% on average within the range from-7.81% to 7.40%. It is essential to consider the potential impact of climate change on water resources in future planning for sustainable utilization of water resources.     

注塑模微机CAD系统

本文介绍了一个微机上运行的注塑模ＣＡＤ系统，此系统主要解决了四个难点，浇注系统设计，冷却系统分析，型腔，型芯的曲面造型设计，装配图和零件工作图的设计绘制，经厂家实际运用证明，该系统使用方便，结果正确，能提高设计效率，降低生产成本。     

Variational Tree Synthesis

Modelling trees according to desired shapes is important for many applications. Despite numerous methods having been proposed in tree modelling, it is still a non‐trivial task and challenging. In this paper, we present a new variational computing approach for generating realistic trees in specific shapes. Instead of directly modelling trees from symbolic rules, we formulate the tree modelling as an optimization process, in which a variational cost function is iteratively minimized. This cost function measures the difference between the guidance shape and the target tree crown. In addition, to faithfully capture the branch structure of trees, several botanical factors, including the minimum total branches volume and spatial branches patterns, are considered in the optimization to guide the tree modelling process. We demonstrate that our approach is applicable to generate trees with different shapes, from interactive design and complex polygonal meshes.     

用金属有机化合物制备铁电薄膜：工艺及进展

本文概述了以金属有机化合物为原料制备铁电薄膜的工艺过程、工艺特点及最新研究进展，着重介绍了金属有机物化学气相溶积（ＭＯＣＶＤ），金属有机物热分解（ＭＯＤ）以及溶胶－凝胶（Ｓｏｌ－Ｇｅｌ）三种制备技术在铁电薄膜制备领域中的应用。