Bond graphs for thermal energy transport and entropy flow

The transport of thermal energy in thermodynamics is described as the product of entropy flow and of the absolute temperature, in analogy to the volume flow and pressure in oil hydraulics and to electric charge flow (= current) and voltage in electronics. Bond graphs are shown to be especially suitable to describe the splitting of applied thermal energy into internal energy and external mechanical work. Transformers and the 0- and 1-junctions of Paynter can illustrate various entropy flow processes, including Carnot engines and heat exchangers. Entropy flow in heat conduction is distinguished from entropy convection, or transport by moving mass, where the entropy/temperature characteristic or equation of state is important. Irreversibilities are represented by impedance transformers reducing temperature and increasing entropy flow but conserving power.     

从序时词语的基准看动意词语的着眼点

动词本身就具有时量属性,基准可以显现动词时量属性实现的语法,语义的规则。对“动－序组列”格式中动意词语作基准的着眼点的种类的分析,不仅可以揭示着眼点造成的岐义,而且有助于揭示动意词语的非基准用法,这除了说明动作有不同的着眼点外,还充实了起始点逆向漂移的类型,以此增强语用的解释力,更好地指导语言的运用。     

A Review of: “Introduction to Reference Sources in the Health Sciences. 5th Ed. Huber,Jeffrey T.; Boorkman,Jo Anne; and Blackwell,Jean, eds.”

Smart boards, also known as interactive whiteboards (IWBs), are large, interactive, touch-sensitive displays that are mainly used for presentation or educational purposes. While some may not consider this an emerging technology today, changes in the design and capabilities challenge that line of thinking. This column will explain what a smart board is, provide a brief history about it, and describe where it is currently used and why it might be a technology to consider having in a library today.     

波普尔的反归纳主义及其失误

波普尔认为，科学知识即理论内容的增长是科学进步最为重要的标志。然而，科学理论的内容丰富程度与逻辑概率之间正好是反变关系。因此，科学的目标不是追求理论的高概率，而是追求理论的低概率；不是追求理论的可证实性，而是追求理论的可证伪性。既然归纳推理是确立结论真实性或概然性的推理，所以归纳推理是与科学目标背道而驰的，因而应当将它从科学方法论中清除出去。然而，当波普尔引入“逼真性”概念以后，他的验证方法便不可能是完全演绎的，而是或多或少地含有归纳的成分。此外，他把塔尔斯基的真理论作为逼真性概念的理论基础也是错误的。     

从美国电子媒体势力演变过程看新老媒体竞争(上)

正在走向市场经济的中国媒介产业 ,报刊 ,广播 ,电视以及新兴的网络媒体 ,如何在日益激烈的广告和受众的竞争中占据有利地位 ,并在竞争中协调合作、共同发展 ,是一个紧迫的课题。美国在这方面起步早 ,经验和教训也多 ,日本中央大学综合政治系教授山口秀夫以一个亚洲研究人员看美国新老媒体竞争演化的视角 ,对之进行了详尽的分析 ,相信会给我们一些启发。