2009国际混凝土设备展会预览

国际混凝土设备展览会将于2009年迎来其35周年的生日。Steve Skinner介绍了参加2009年2月在美国拉斯维加斯展览会的新产品。     

CEA总裁兼CEO——Shapiro评论美消费电子领域热门事件

CEA总裁兼CEO最近在关注一些热门事件,其中包括消费电子制造工厂——中国给美国经济带来的挑战和数字电视的转换本月初,CEA举行了为期两天的华盛顿论坛,第一天主要讨论自由贸易,第二天则围绕2009年2月将实行的高清数字电视转换事件,进行讨论。     

Tweeter的CEO谈新模式以及未来

乔治·格拉诺夫,Tweeter的总裁兼首席执行官(左),出席了他的第一场PRO(渐进零售商组织)小组的春季会议,向供应商介绍一个新的商业模式,此     

Towards a framework of clean energy technology receptivity

Technology invention, innovation and transfer have been a constant of human evolution. Facing humanity is the threat of anthropogenic climate change, the solution to which is to reduce the rate at which greenhouse gasses (GHGs) are building up in the atmosphere and to deal with the impacts of climate variability and change. To deal with the global crisis requires technology invention, innovation and transfer and changes in behaviour that reduce the GHGs intensity of energy services. Meanwhile, the poverty reduction and development agenda are being shaped by the Millennium Development Goals, which slowly appears to be gaining buy-in. The question is how will the accelerated receipt of cleaner energy technologies can be successfully achieved in marginalised communities in developing countries? The paper considers a range of drivers, case studies and projects that are being undertaken as early Clean Development Mechanism experiments under the banner of the International SouthSouthNorth Group. It discusses the drivers of technology transfer and starts to unpack the elements of successful receptivity through selection and ownership of the newly introduced environmentally safe technologies (ESTs) for the provision of energy services.     

Scenario-focused development method for a pen-based user interface: model and applications

Pen-based user interface (PUI) has drawn significant interest, owing to its intuitiveness and convenience. While much of the research focuses on the technology, the usability of a PUI has been relatively low since human factors have not been considered sufficiently. Scenario-centric designs are ideal ways to improve usability. However, such designs possess some problems in practical use. To cope with these design issues, the concept of “interface scenarios” is proposed in to facilitate the interface design, and to help users understand the interaction process in such designs. The proposed scenario-focused development method for PUI is coupled with a practical application to show its effectiveness and usability.     

RPC and REST: Dilemma, Disruption, and Displacement

Technologists act as if the REST vs. RPC debate is purely technical, but technology choices are never really quite so black and white. This column examines the non-intuitive theories and evidence behind Clayton Christensen's innovator's dilemma to explore technology life cycles, discuss what makes different customers choose different technologies, and consider how different types of innovation affect the evolution of integration products.     

Characterization of nanocellulose‐ reinforced shape memory polyurethanes

BACKGROUND: Shape memory polymers are capable of fixing a transient shape and of recovering their original dimensions by the application of an external stimulus. Their major drawback is their low stiffness compared to smart materials based on metals and ceramics. To overcome this disadvantage, nanocellulose was utilized as reinforcement. RESULTS: Composites were prepared by casting stable nanocellulose/segmented polyurethane suspensions. The heat of melting of the polyurethane soft segment phase increased on cellulose addition. Composites showed higher tensile modulus and strength than unfilled films (53% modulus increase at 1 wt% nanocellulose), with higher elongation at break. Creep deformation decreased as cellulose concentration increased (36% decrease in 60‐minute creep by addition of 1 wt% nanocellulose). The nanocomposites displayed shape memory properties equivalent to those of the neat polyurethane, with recoveries of the order of 95% (referred to second and further cycles). CONCLUSIONS: It is possible to markedly improve the rigidity of shape memory polymers by adding small amounts of well‐dispersed nanocellulose. However, this improvement did not have substantial effects on the material shape fixity or recovery. Shape memory behavior seems to continue to be controlled by the polymer properties. Copyright © 2007 Society of Chemical Industry     

处理器设计的谬误（1）

本系列深度分析文章将调查13种不成功的处理器种群,探索了造成每一个处理器种群死亡的主要设计错误。每一个主要设计错误还用一个或几个例子来阐述。