介置、转置、原置、重置与并置——上海石库门公共消费空间重塑对里弄社区空间的影响

将上海石库门里弄置于20世纪90年代以来上海实施的三轮"旧改"背景中进行分析。通过比较已有改造模式,认为当下石库门里弄改造主要分为介置、转置、原置、重置与并置五种方式。通过分析五个实例在改造前后社区消费能级的变化,指出这五种方式所采用的空间改造策略会对石库门社会空间组织模式的整体性产生影响,更有可能改变原有空间模式与周边地区的相互关系。指出石库门里弄街区具有"商业-社区"共生体的性质,认为在消费主义时代这种共生关系应由简单的二元共生演化为复合的二元共生。最后对五种改造方式进行综合评析,旨在从目前"非拆即保"的极端改造中寻求更多的可行之道。     

Effect of Adsorbent Diameter on the Performance of Adsorption Refrigeration

Adsorbents are important components in adsorption refrigeration. The diameter of an adsorbent can af-fect the heat and mass transfer of an adsorber. The effect of particle diameter on effective thermal conductivity was investigated. The heat transfer coefficient of the refrigerant and the void rate of the adsorbent layer can also affect the effective thermal conductivity of adsorbents. The performance of mass transfer in the adsorber is better when pressure drop decreases. Pressure drop decreases with increasing permeability. The permeability of the adsorbent layer can be improved with increasing adsorbent diameter. The effect of adsorbent diameter on refrigeration output power was experimentally studied. Output power initially increases and then decreases with increasing diameter under different cycle time conditions. Output power increases with decreasing cycle time under similar diameters.     

采用静电记录的高速印刷机

本文叙述了用绝缘文字板和静电记录纸高速记录输入数字信息的方法,并根据这种方法的设计和实验结果,制造了速度为125行/秒(4000个符号/秒)的实验装置。由此证实,以每秒30,000个符号的速度进行记录是可能的。