论陶瓷艺术美学研究的理论思路

试图对20世纪以来的陶瓷艺术美学研究进行简单的梳理,阐述其赖以进行的理论基础和方法,揭示其规律,总结其得失,为现代陶艺的美学研究和理论建构做一个铺垫。     

配电线路设计中的问题与新型断路器的开发

分析了配电线路中应用短延时断路器存在的问题和解决途径，提出了配电线路设计对变电所出线断路器接地保护的要求，对四极断路器的开发和应用进行了探讨。     

汽车制造中非标准设备的设计

以汽车发动机装配线物料随线设备的设计为例,以“积木式设计方法”为中心,以CAD／CAE为实现手段,对汽车行业非标准设备的设计方法作研究,总结规律及方法,旨在促进汽车行业非标设备国产化的进程。     

定态法、数值积分应用于H_2和Br_2间反应机理中的问题

将定态近似法在603K、1003K、1403K不同程度地用于H_2+Br_2→2HBr反应,计算出c—t数据。在603K左右对[H]、[Br]均可用定态法处理,在1003K左右只能对[H]用定态法处理,在1403K左右只有在较高转化率下才能对[H]用定态法处理。当可以使用定态法时,必须使用有关近似公式,才可顺利进行数值积分,否则因步长不能放大,难以实现。     

一类线性不确定系统控制器设计的参数空间方法

讨论了线性不确定系统控制器的设计问题.首先将不确定系统表述成多模形式,然后用参数空间方法解决了多模系统控制器的设计问题.提出了一种新的方法——网格法,它较 Ackermann 等人提出的方法更加简单,可方便地求出三阶和三阶以上系统满足—稳定性的参数空间.最后将此方法成功地用于设计实例中.     

大型硫磺制酸装置的风机选型探讨

介绍了离心式风机和轴流式风机的结构、性能曲线、调节方法及调节性能,论述了各自的适用范围并比较了利弊。考虑到静叶片调节轴流式风机流量大、调节性能好、阻力增大时对风机流量影响小,建议在大型硫磺制酸装置中使用。     

启发式教学法在有机化学“羧酸及其衍生物”教学中的应用

本文介绍了启发式教学法在有机化学＂羧酸及其衍生物＂课堂教学中的应用。在总结前期学习内容的基础上,针对羧酸分子中羰基活泼性,α-氢的活泼性及酸性等问题,我引导学生从比较甲酸与甲醛和甲醇分子结构入手,紧紧围绕甲酸分子结构中介于碳-氧双键与碳-氧单键之间的碳-氧键长,分析甲酸分子结构的特点,定性地解答甲酸与甲醛和甲醇化学性质的差异性,加深了学生对羧酸结构与化学性质的认识,提高了学生的学习积极性,取得了良好的教学效果。     

Solution‐reprocessable microporous polymeric adsorbents for carbon dioxide capture

Solution‐processable microporous polymers are promising materials for CO₂ capture because of their low synthetic cost and high processability. In this work, we for the first time systematically evaluate the feasibility of two microporous polymers, namely PIM‐1 and its hydrolyzed form hPIM‐1, as adsorbent materials for postcombustion CO₂ capture. By conducting ternary CO₂/N₂/H₂O breakthrough experiments, PIM‐1 demonstrates several promising features: moderate CO₂ working capacity, low water vapor uptake capacity, good moisture resistance, and easy regeneration process. In addition, we have pioneeringly studied the multiple‐cycle CO₂ adsorption–desorption induced relaxation effect on soft PIM‐1 polymers. Through a simple dissolution–precipitation approach, PIM‐1 can restore its BET surface area, CO₂ uptake capacity, and pore‐size distribution. The solution reprocessability of PIM‐1 demonstrated in this study distinguishes it from other rigid adsorbents and thus offers a new insight for the future design of economically‐viable and facilely regenerable adsorbents. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3376–3389, 2018     

Robust Simulation of Counterflow Moving Bed Dryers

Abstract

In this work, a robust and accurate strategy for simulating counterflow moving bed dryers is presented. A complete pseudo-transient phenomenological model for the process has been developed and the variable time is used as a continuation parameter. The desired solution is the final steady-state reached by the model. The code DASSL is used to perform the integration of the differential algebraic equation system and consistent initialization is achieved via a direct technique. The computational effort is surprisingly small comparing to those reported in the literature. Reasonable concordance between simulated and experimental results has been observed even though the mathematical model contains no adjustable parameters. Convergence problems have not been observed for all tested operating conditions, including those pointed by other authors as particularly difficult. The mathematical tool built is capable of making accurate predictions about the behavior of the equipment in affordable computing time and hence this constitutes an invaluable tool to study counterflow moving bed drying.     

Simulation study and kinetic parameter estimation of underground coal gasification in Alberta reservoirs

A new method is developed for the estimation of chemical reaction kinetics at high-pressure underground coal gasification from the field produced gas composition. This method combines a developed numerical forward model and field data to investigate uncertain parameters. The forward model is developed on the basis of a unique porous media approach that combines the effects of heat, mass transport, and chemical reactions to simulate the underground coal gasification in three-dimensional basis. The chemical reaction kinetics, that is limited to low pressure, is upscaled based on the available experimental data. A comprehensive sensitivity analysis is carried out to estimate the reaction kinetics and investigate the effect of various parameters, such as pressure, temperature, and reaction environment, on the produced gas composition. The novelty of the developed method is in its applicability as well as its ability to generate the chemical reaction kinetics that corresponds to the field under study. The advantage of the proposed technique is that the sensitivity of the model to different kinetic parameters can be investigated by a graphical method.