珠江三角洲设计产业现状及前景预测

准确地说,“珠江三角洲”已不再是一个纯粹意义上的地理概念,在中国市场经济稳定发展的今天,它早已成为“活跃的民营经济”的代名词。在广东经济发展过程中,珠三角一直扮演着十分重要的角色,自上世纪80年代以来,其国内生产总值一直占广东省国内生产的70％以上。珠三角经济的迅速腾飞有以下一些特点：     

基于ADS的低频电子元器件建模技术研究

针对国产元器件模型库缺乏的问题,在ADS软件的基础上,对不同低频电子元器件的建模方法进行了详细的介绍,重点阐述了元器件几种建模方法和具体实施步骤,并介绍了新建模型的封装和验证。该建模方法也可用于其他软件平台上的元器件建模。     

A New Ferroelectric Phase of YMnO3 Induced by Oxygen‐Vacancy Ordering

Manganese oxides are good candidates of strongly correlated electron materials due to the uniqueness of electronic structure of manganese and the mobility of oxygen among lattice sites under external impacts. Here, we used electron beam as the excitation source to explore the structural evolution of YMnO₃ and identified a new phase under the radiation of electron beam in the transmission electron microscope. Analyses of the electron energy‐loss spectra reveal that this phase originates from ordered oxygen vacancy. We applied the first principles calculation to pick out the optimized stable structure with a lower polarization, and verified its correctness by electron diffraction and image simulations. Analyses of density of states indicate that weak Y–O covalence is favorable for the existence of ferroelectricity, supporting the electrostatic nature of ferroelectricity in the YMnO₃.     

Perfluorosulfonated ionomers membranes: Melt‐processing and characterization for ion exchange applications

Perflurosulfonated ionomers membranes with different ionic‐exchange capacity were successfully fabricated via melt‐extruding and casting of their –SO₂F precursors. A systematical investigation of the thermal stability, crystallinity, and rheological properties of the precursors was performed to secure their optimized processing conditions. The tensile properties of acid‐form membranes are found to increase with base‐hydrolysis time, where a tensile strength of 38.2 MPa is readily obtained after 24 h's base‐hydrolysis. The content of –SO₂F or –SO₃H containing side‐chains plays an important role in the thermal stability, rheological, and mechanical properties of the precursor or the acid‐form membranes. The strong ionic interactions, attributed to the –SO₃H groups, lead to decreased crystallinity and tensile strength for different IEC membranes. The acid‐form membranes exhibit good proton conductivity and low methanol crossover in comparison with reference Nafion membrane. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39944.     

煤化工用水及废水处理分析

概述了煤化工高能耗、高污染、高耗水的产业特点,从工艺、意识、来源分析了造成产业特点的原因。为了减少煤化工废水中有毒害物质的含量,介绍了常用的废水处理方法,展望了煤化工用水及废水处理发展趋势。     

Synthesis and optimization of high-performance amine-based polymer for CO2 separation

Membrane technology features inspiring excellence from numerous separation technologies for CO₂ capture from post-combustion gas. Polyvinylamine (PVAm)-based facilitated transport membranes show significantly high separation performance, which has been proven promising for industrial scale-up. However, commercialized PVAm with low molecular weight and excessive crystallinity is not available to prepare high-performance membranes. Herein, the synthesis process of PVAm was optimized by regulating polymerization and acidic hydrolytic conditions. The membranes based on PVAm with a molecular weight of 154 kDa and crystallinity of 11.37% display high CO₂ permeance of 726 GPU and CO₂/N₂ selectivity of 55 at a feed gas pressure of 0.50 MPa. Furthermore, we established a PVAm synthesis reactor with an annual PVAm solution (1%(mass)) capacity of over 7000 kg and realized the scaled-up manufacture of both PVAm and composite membranes.     

基于包容性的城市慢行交通综合导视交互设计研究

针对城市慢行交通系统的导视进行了研究,提出了基于包容性理念的综合导视系统的设计概念,设计过程包括了原型测试、行人动线研究、互动导视系统的设计等内容。     

智能建筑智能化系统工程实施中的问题及对策的探讨

随着当前经济的发展,智能建筑在建筑中使用率在不断提升。随着智能化建筑的广泛应用,在工程实施的过程中会产生很多的问题。要针对所产生的问题采取相关的措施,以提高智能建筑的施工质量。     

自行式高空作业平台工业设计研究

以北京京城重工机械有限责任公司产品GTBZ系列高空作业车的转动平台外观造型设计为例,说明了应用计算机辅助工业设计技术,实现高空作业车外观造型设计的设计程序以及其关键技术与方法,阐述了产品结构设计与外形设计同步进行的并行设计思想,并且说明了在计算机三维环境中实现产品的模拟真实感表现的相关内容,根据产品形象设计原理及产品外观的语意学规律,完成了高空作业车的转动平台外观设计和整车的色彩设计。