Combinatorial approach to study the effect of acrylic polyol composition on the properties of crosslinked siloxane-polyurethane fouling-release coatings

The effect of acrylic polyol composition on the properties of crosslinked siloxane-polyurethane coatings was explored. An acrylic polyol library was synthesized using batch solution polymerization and characterized using high-throughput gel permeation chromatography (Rapid-GPC) and differential scanning calorimetry (DSC). Siloxane-polyurethane coatings were prepared from 3-aminopropyl-terminated poly(dimethylsiloxane) (PDMS), the acrylic polyols and a polyisocyanate crosslinker. The siloxane-acrylic-polyurethane coatings were tested for mechanical and physical properties. The siloxane-polyurethane coatings had a systematic variation in glass transition temperature and had water contact angles ranging from 95° to 100°. Many of the coatings also showed a low-force of release in the pseudo-barnacle pull-off adhesion test. Performance testing of the fouling-release properties of the siloxane-polyurethane coatings on array panels with algae, namely the diatom Navicula and sporelings (young plants) of the green seaweed Ulva was also conducted. Presented at the 2006 FutureCoat! conference, sponsored by the Federation of Societies for Coatings Technology, in New Orleans, LA, on November 1–3, 2006.     

两平移一转动并联机器人的控制研究

结合中医传统推拿手法,设计了一种两平移一转动的三自由度的并联机构中医推拿机器人.该机器人不仅能模拟中医推拿常用的几种手法,而且结构简单、位置分析求解容易、解耦性强,易于实时控制.在硬件控制回路中,采用模块化处理,使得机器人组装简便,可移植性好,便于错误排查.在软件设计时,运用VC 6.0多线程技术,实现了远程实时监控的功能.其控制界面简洁、友善、操作方便,不易出错,符合医用界面的要求.     

超声变幅杆的动态性能分析

根据变截面杆纵向振动的波动方程,推导悬链形超声变幅杆的频率方程,应用有限元法对变幅杆进行模态分析,得到共振频率、横向振动频率、位移节点、放大系数等重要参数。与理论计算值比较表明,有限元法可获得很高精度。     

Computer modelling of tool loads and press/tool deflections in multistage forging

A mathematical model of the deflections arising during forging in a multistage press provides the basis for the development of a computer package which can be used to predict the dimensional changes in workpieces occurring at each stage, due to a change at any one stage and individual tool loads and total press load for any given set of conditions. The program can be used to speed up tool setting times by enabling the correct shut-heights for each forming stage to be determined without trial and error. It can be used also to investigate the effects of changes (either deliberate or unintentional) in process conditions such as: lubrication, billet volume or hardness, on the dimensions of the finish forged component. The program has been validated by comparing its output with the results of experiments comprising: single-stage, two-stage and three-stage forging undertaken on a vertical crank press.     

水产工厂化养殖智能监控系统

研制了一套工厂化水产养殖多环境因子智能监控系统。该系统采用图像处理和专家系统的方法对鱼病进行自动诊断和早期预报，采用移动GPRS无线通讯技术和互联网技术进行远程数据采集和监控。试验结果表明，该系统操作方便，人机界面友好，能实时监控鱼池中的多环境因子和在线鱼病诊断。     

家用水冷空调器与风冷空调器运行性能比较

本文旨在探讨水冷空调器在住宅中使用的节能潜力。设计了分体式风冷和水冷空调器性能的测试实验台,实验研究在不同的室内负荷和室外干球温度、相对湿度条件下,水冷空调器与风冷空调器的性能和节能效果比较。     

Treatment of brackish produced water using carbon aerogel-based capacitive deionization technology

Capacitive deionization (CDI) with carbon-aerogel electrodes represents a novel process in desalination of brackish water and has merit due to its low fouling/scaling potential, ambient operational conditions, electrostatic regeneration, and low voltage requirements. The objective of this study was to investigate the viability of CDI in treating brackish produced water and recovering iodide from the water. Laboratory- and pilot-scale experiments were conducted to identify ion selectivity, key operational parameters, evaluate desalination performance, and assess the challenges for its practical applications. The performance of the CDI technology (CDT) system tested was consistent throughout the laboratory- and field-scale experiments. Deterioration of the carbon-aerogel electrodes was not observed during testing. The degree of ions adsorbed to the carbon aerogel (in mol/g aerogel) during treatment of brackish water was dependent upon initial ion concentrations in the feed water with the following selectivity I>Br>Ca>alkalinity>Mg>Na>Cl. The preferential sorption of iodide revealed merit to efficiently recover iodide from brackish water even in the presence of dominant co-ions. The research findings derived from this study identified parameters that merit further improvements regarding design and operation, including modification of pore-size distribution of aerogel, development of high capacitance and low-cost electrode materials, reducing the dead volume after regeneration and rinsing, minimizing energy consumption, and maximizing system recovery.     

乌鞘岭隧道三维地应力场多元有限元 回归拓展分析

 采用三维有限元多元回归分析方法,基于有限测点的地应力量测结果,拓展分析隧道区原始宏观地应力场。建立隧道区两个大规模三维计算模型,通过有限元分析软件ANSYS对重力、水平挤压和剪切等4种工况的构造应力场分别进行计算。编制三维地应力场多元回归分析计算机软件MEBA以及与ANSYS的接口程序MEBAC,实现地应力场的多元回归拓展分析,着重分析乌鞘岭隧道岭脊地段的复杂应力状况、应力值的宏观大小和规律,特别是F4,F5,F6,F7断层及其附近的应力状况。宏观地应力场的分析结果表明,乌鞘岭隧道宏观地应力场的主应力方向为N21.2°E,与隧道轴线的夹角为38.2°,断层区隧道衬砌具有纵向挤压和横向受力不对称的特点。区段地应力值高,在隧道轴线位置,最大垂直地应力为32.10 MPa,垂直于隧道轴线方向最大水平地应力为21.72 MPa。宏观地应力场的分析结果对工程的动态设计与施工具有重要参考价值。     

‘Never Mind All That Environmental Rubbish,Get On With Your Architecture’

Could the primacy of green architecture in recent years be eroding the discipline? Is it reducing architecture to a mere ‘environmental techno-science’? Penelope Dean argues for a revised environmental agenda that is driven by ideas and concepts rather than subservient technologies. Copyright © 2009 John Wiley & Sons, Ltd.     

A land use model of the effects of eco-labeling in coffee markets

International non-profit organizations have started to implement eco-labeling for credence attributes programs aimed to inform consumers about environmentally sound or “sustainable” production standards for various products. Using coffee labeled as “shade grown” or “bird friendly” as an example, this paper describes the impact such labeling programs may have on local land use patterns in coffee producing regions. Shade grown coffee farms should provide a variety of external benefits, including the preservation of biodiversity, carbon sequestration, the prevention of soil erosion and aquifer recharge. Those externalities, however, are not expected to have observable land use impacts unless they are capitalized in the coffee market. The prospect of market capitalization of externalities suggests the extension of the conventional von Thünen model to the calculation of social location rent. Using the maximization of social location rent as a criterion allows the externality effect to play a direct role in market-based land use allocation of land between eco-labeled shade grown coffee production and other activities.