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关键词： 海水淡化产业   工程中心   国家   膜分离   主任   环保   教授   制造技术  

摘要： 《海水淡化科技发展＂十二五＂专项规划》中,将反渗透海水淡化膜及组器制造技术、海水预处理膜及连续膜过滤装置开发两项技术,列为＂十二五＂期间国家重点发展的核心技术与关键装备,目的是推动海水淡化产业的进一步发展。国内海水淡化膜的研发和生产的唯一单位蓝星集团,该公司拥有两条反渗透膜生产线,年生产能力达到700万平米膜面积。

关键词： Virtual engineering   energy optimisation   reconfiguration   discrete event simulation  

摘要： Increasing the cost of electricity and the global obligations for efficient use of energy have added additional pressure to industrial companies in an already challenging market. Manufacturing companies are adopting methods to have a greater agility to respond quicker to the market dynamics and varying demands by changing production configurations. In recent years, deploying virtual engineering design approaches and extensive simulation methods have facilitated an early insight into how a system may perform, in advance of the physical build. However, the impact of system reconfiguration on the cost of energy consumption is typically unknown. Much research has been carried out on the development of new energy-efficient drives (e. g. motors and actuators) and also the possibility of turning off the drives when idle to save energy. However, in this article, the authors propose a new method of energy saving for engineering production lines by fine tuning the low level device motions to optimise energy consumption. An integration method between virtual engineering design and simulation modelling is proposed, and as a result a simulation method for energy optimisation is developed. In this article the method of interpreting virtual design data for use in simulation modelling of a production assembly line in an automotive industry is discussed. Furthermore, a developed algorithm for optimising energy usage based on adjusting dynamic properties of the system components (e. g. accelerations, torque and mass) is discussed and the result of implementing the concept in an experimental application in the powertrain industry is reported.

关键词： Time-cost-environment   Trade-off   Construction project   Fuzzy   Genetic algorithm  

摘要： This paper presents a discrete time cost environment trade-off problem for large-scale construction systems with multiple modes under fuzzy uncertainty. A multi-objective decision making model is established in which the total project duration is regarded as a fuzzy variable. To deal with the uncertainty, the fuzzy numbers in the model are defuzzified by using an expected value operator with an optimistic pessimistic index. The objective functions are to minimize the total project cost, project duration, crashing cost, and environmental impact. Furthermore, a fuzzy-based adaptive-hybrid genetic algorithm is developed to find feasible solutions. The one-point crossover and repairing strategy for mutations are designed to avoid infeasible solutions. Finally, the Jinping-II Hydroelectric Project is used as a practical example to demonstrate the practicality and efficiency of the model. Results and a sensitivity analysis are presented to highlight the performance of the optimization method, which proves to be very effective and efficient compared to other algorithms. Crown Copyright (C) 2012 Published by Elsevier Ltd. APM and IPMA. All rights reserved.

关键词： Solar energy conversion  

摘要： Colloidal quantum-confined semiconductor nanoheterostructures (SNHs) that are composed of multiple component materials in rationally designed spatial arrangements are promising light harvesting and charge separation materials for solar energy conversion. SNHs can be engineered to exhibit type I, quasi-type II and type II carrier localization, affecting their photophysical properties and photochemical performances. Unlike bulk semiconductor heterostructures, the electron and hole energy levels and spatial distributions in SNHs can be continuously tuned by adjusting the material dimension through the quantum confinement effect, providing additional control of their properties through wavefunction engineering. In this article, we review recent progress in using wavefunction engineering to control the absorption and emission spectra, single and multiple exciton dynamics and charge transfer properties of SNHs (core/shell QDs and dot-in-rod nanorods) as well as to improve their performance as light harvesting and charge separation materials for solar energy conversion.

关键词： 变压吸附装置   气体分离技术   四川天一科技股份有限公司   高新技术企业   分离工程   中国科学院   国家科技部   评审认定  

摘要： 四川天一科技股份有限公司（天科股份，股票代码600378）是国家科技部和中国科学院评审认定的高新技术企业。公司下属的变压吸附分离工程研究所是专业从事变压吸附（简称PSA）气体分离技术的研究、工程技术开发、工程设计、工程承包的机构。公司已建成投产各类变压吸附装置1000多套，其中建成投产变压吸附提纯氢气装置近600套。

关键词： 高速公路   旧桥护宽   旧桥改造  

摘要： 高速公路旧桥改造项目是改扩建工程中相对复杂的内容。以正在进行的湖北省黄(石)黄(梅)高速公路赤东湖中桥扩宽工程为例,分析旧桥扩宽项目较可行的设计理念和相关工程管控。

关键词： CHEMORECEPTORS   OLFACTORY nerve   NERVOUS system   PROTEINS   NEURONS  

摘要： Some chemoreceptors of the trace amine-associated receptor (TAAR) family detect innately aversive odors and are proposed to activate hardwired olfactory circuits. However, the wiring of TAAR neurons, the regulatory mechanisms of Taar gene choice, and the subcellular localization of TAAR proteins remain unknown. Here, we reveal similarities between neurons expressing TAARs and odorant receptors (ORs), but also unexpected differences. Like ORs, TAARs seem to be monoallelically expressed and localized both in cilia, the site of odor detection, and in axons, where they may participate in guidance. TAAR neurons project to discrete glomeruli predominantly localized to a confined bulb region. Taar expression involves different regulatory logic than OR expression, as neurons choosing a Taar5 knockout allele frequently express a second Taar without silencing the deleted allele. Moreover, the epigenetic signature of OR gene choice is absent from Taar genes. The unique molecular and anatomical features of the TAAR neurons suggest that they constitute a distinct olfactory subsystem.

关键词： 四川天一科技股份有限公司   变压吸附装置   气体分离技术   高新技术企业   分离工程   中国科学院   国家科技部   评审认定  

摘要： 四川天一科技股份有限公司（天科股份，股票代码600378）是国家科技部和中国科学院评审认定的高新技术企业。公司下属的变压吸附分离工程研究所是专业从事变压吸附（简称PSA）气体分离技术的研究、工程技术开发、工程设计、工程承包的机构。公司已建成投产各类变压吸附装置1000多套，

关键词： 化工分离工程   教学实践   应用型人才  

摘要： 依据化工分离工程课程的特点,以培养应用型人才为教学目标,本文分析了教学环节中存在的突出问题,并结合教学实践,在教学内容、实验和科研等方面进行了一系列的改革,激发学生的学习兴趣,培养了学生的实践能力。

关键词： lithium-ion batteries   polydimethylsiloxane   polymethylmethacrylate   carbon nanotubes   block copolymers  

摘要： Flexible energy-storage devices have attracted growing attention with the fast development of bendable electronic systems. However, it still remains a challenge to find reliable electrode materials with both high mechanical flexibility/toughness and excellent electron and lithium-ion conductivity. This paper reports the fabrication and characterization of highly porous, stretchable, and conductive polymer nanocomposites embedded with carbon nanotubes (CNTs) for application in flexible lithium-ion batteries. The systematic optimization of the porous morphology is performed by controllably inducing the phase separation of polymethylmethacrylate (PMMA) in polydimethylsiloxane (PDMS) and removing PMMA, in order to generate well-controlled pore networks. It is demonstrated that the porous CNT-embedded PDMS nanocomposites are capable of good electrochemical performance with mechanical flexibility, suggesting these nanocomposites could be outstanding anode candidates for use in flexible lithium-ion batteries. The optimization of the pore size and the volume fraction provides higher capacity by nearly seven-fold compared to a nonporous nanocomposite.