基于功能-行为-结构情景设计的未预见发现构造模型驱动产品创新

分析描述性设计和情景设计的两种方法。未预见发现(Unexpected discovery,UXD)是一种驱动产品创新的科学认知设计过程。在情景类比设计过程中,通过寻找UXD来实现产品创新设计。建立功能—行为—结构(Function-behaviour-structure,FBS)模型和UXD分析模块,将情景设计与所建立的设计模块有机地结合在一起,实现产品的创新。介绍情景设计与非情景设计对FBS和UXD的影响。水龙头与房门的情景类比实例,验证了情景设计用于产品创新是行之有效的。     

纹理传递在lαβ色彩空间中的实现*

比较了lαβ色彩空间与其他颜色模型的特点,阐述了lαβ色彩空间在图像处理中的应用,包括颜色传递技术和图像类比技术。     

数据采集与处理系统芯片-ADuC845及应用

随着嵌入式系统的发展，模拟信号处理单元与MCU正逐步融为一体，数据采集与处理系统芯片-ADuC845是这一融合的具体体现和产物。现对ADI公司的ADuC845芯片及其特性、应用作详细介绍。     

物理化学教学中之授课技巧

本文介绍了作者经过多年物理化学教学实践探索出的一些比较成熟的针对物理化学课程特点的授课技巧,包括引子、比喻等多种手段,目的是将理论性很强的知识点尽量讲解得通俗易懂,使较为枯燥的物理化学知识变得比较生动有趣.     

横掠椭圆钉头管换热及流阻特性的实验研究

利用热质比拟原理及萘升华技术 ,对空气横掠椭圆钉头管时的对流换热及流阻特性进行了研究。对管面上及椭圆钉头上的对流换热系数分别进行了测量 ,通过计算得到总体换热系数及流动阻力的实验关联式。实验结果表明 ,椭圆钉头管的对流换热系数高于光管 ,在实验规定的雷诺数范围内 ,椭圆钉头管的流阻小于圆形钉头管 ,有时也低于光管     

山区深厚抛填土地基的沉降分析及建议

随着城市化建设发展;开山填沟等方式在西南山区比较普遍;势必会形成大量的抛填土场地;抛填土场地的沉降性能是工程建设比较关注的问题;通过钻探、波速测试等原位测试手段;采用工程类比分析;计算了工程场地的变形模量及后期可能的变形;同时与相关工程监测成果进行了比较分析;计算结果虽大于监测值;但不影响工程整体判断;综合分析得出均匀性较好的石质抛填土在填土年限大于5年的情况下;在对浅表层地基土进行适量的处理后;可作为电力线路铁塔基础场地使用;研究成果可作为同类工程计算分析借鉴。     

Proof by analogy in mural

An important advantage of using a formal method of developing software is that one can prove that development steps are correct with respect to their specification. Conducting proofs by hand, however, can be time consuming to the extent that designers have to judge whether a proof of a particular obligation is worth conducting. Even if hand proofs are worth conducting, how do we know that they are correct? One approach to overcoming this problem is to use an automatic theorem proving system to develop and check our proofs. However, in order to enable present day theorem provers to check proofs, one has to conduct them in much more detail than hand proofs. Carrying out more detailed proofs is of course more time consuming. This paper describes the use of proof by analogy in an attempt to reduce the time spent on proofs. We develop and implement a proof follower based on analogy and present an example to illustrate its characteristics. The example shows that even when the follower fails to complete a proof, it can provide a hint that enables the user to complete a proof.     

新型高可靠性甲烷传感器设计

介绍一种采用低功耗AT89LV51单片机构成的高精度、低功耗、高可靠性、智能型新型煤矿井下甲烷传感器。甲烷传感器采用数字芯片，显著提高了甲烷检测精度，减小了仪表体积，同时采用了XICOR公司的SPI接口的看门狗和X5045芯片，使系统更加稳定可靠。与PC机通信可建立井下环境数据库，便于井下工人随身携带，而且预防了安全事故的发生。     

浅析扎哈·哈迪德设计思想之衍变及形式语言之逻辑

该文试以扎哈·哈迪德的各时期主要作品为线索,浅略地探究其设计思想的形成及衍变过程,并通过对其主要设计方法的归纳探究扎哈·哈迪德形式语言的逻辑性。     

Effects of the dimensions of upward- and downward-facing vertical cavities on natural convection

The mass transfer due to natural convection in open upward- and downward-facing vertical cylindrical cavities was measured experimentally for Rayleigh numbers (Ra_Lw) ranging from 2.57 × 10⁸ to 1.04 × 10¹⁰ for various diameters and heights. Mass transfer was measured using a sulfuric acid–copper sulfate electroplating system and the limiting current technique. The results of preliminary natural convection experiments using horizontal circular disks were in good agreement with predictions based on existing correlations for horizontal surfaces. The Sherwood numbers (Sh_Lw) for upward-facing cylindrical cavities were higher than those for downward-facing ones. Cavity dimension affected mass transfer rate. Total mass transfer rates measured in cavities were compared with ones calculated using horizontal and vertical correlations for the same areas to delineate flow interactions in the cavities. For both cavity orientations, diameter had a stronger effect for lower cavity heights. In upward-facing cavities, the total mass transfer rate was increased due to the secondary flow generated by the negative pressure formed by two ascending flows from the bottom plate and the vertical inner wall. In downward-facing cavities, flow interaction impaired the mass transfer rate. Empirical correlations for upward- and downward-facing vertical cylindrical cavities were derived based on the test results.