利用流态化CVD技术在超细Al2O3粒子表面包覆SnO2薄膜的模型化研究

A theoretical treatment of simulating the morphology and content of SnO2 film coated on ultrafine Al2O3 particles in fluidized bed by chemical vapor deposition (CVD) was developed. The present model accounted for chemical reaction, coagulation, film coating, nucleation coating and gas entrainment of the coating process, which made it possible to predict the quality and quantity of the film coated. By means of Tenanor's method, the model was calculated numerically. Part of the numerical results were compared with the experimental data.     

车用智能化预紧式安全带综合试验台设计

分析了传统汽车安全带的缺点,设计了智能化预紧式安全带试验台系统.该试验台由预警传感器、安全带卷收系统和基于MC9S12DP256的核心控制器组成.重点介绍了安全带卷收系统的优化设计和控制器的电路设计.设计的试验台通过对传感器预警信号的处理能够提前预知危险的发生并控制安全带收紧,实现了安全带主动预紧的功能,满足了主动安全的需要.     

Wall sheeting diagnosis in fluidized beds based on chaos analysis of acoustic emission signals

A novel method, based on acoustic emission （AE） techniques, for detecting agglomeration in fluidized beds is presented. Particle size characteristics are determined based on the principle that AE signals with different frequency band energies are emitted when particles of different sizes impact an internal wall. By applying chaotic analysis to the AE signals, the malfunction coefficients are well defined. Agglomeration in the fluidized bed can then be detected by the sudden variation of malfunction coefficients. AE signals were investigated in a laboratory scale heated fluidized bed and an industrial polyethylene flu- idized bed. Experimental data showed that the malfunction coefficients increased with the growth of agglomeration. The results indicated that agglomeration in fluidized beds can be predicted and diagnosed effectively and precisely using AE techniques based on chaotic analysis.     

花坛在城市景观中的应用

对花坛的概念、作用、分类进行了介绍,提出了植物选择、色彩搭配和花坛维护等在花坛造景中应注意的问题,以期为花坛在城市景观中的应用提供借鉴.     

模拟移动床色谱分离手性药物的研究进展

手性药物对映体分离理论与应用技术在药物及生命科学研究领域中占有极为重要的位置,是当前制药工业和生物技术发展的尖端研究课题。模拟移动床色谱已被国际上公认为制备规模拆分手性药物的最有效手段。介绍了模拟移动床色谱数学模型和数值分析方法的最新进展。     

步进式冷床的结构分析及其现场维护

介绍了特钢厂800轧线大棒步进式冷床的结构形式及工作原理。总结了该装置使用以来由于设备安装缺陷而产生的故障,并对部分改进方案的实施性、可靠性进了的分析,并采取了相应的改进措施。     

Hydrodynamics and oxygen transfer in a novel extra-loop fluidized bed bioreactor

In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5 -3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor （CSTR） mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. KLa could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, KL~ value was increased. The amount of carrier complex influence on KLa. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800 1 000 g carrier loading （pouzzolane） or 600 g PVC. Under gas/liquid ratio of 0.8% -5.2%, KLa was （0.62-1.37）×10^-2· s^-1.     

关于我国发展循环经济几个问题的探讨

我国的资源和环境承载力将不可能支持未来经济的高速发展。因此,必须正视存在问题,加强政府宏观调控,完善政策、法律、法规体系,依靠技术进步,提高公众参与水平,推进清洁生产,切实转变现有的发展模式,大力发展循环经济。     

西部地区图书馆资源共享的探索与实践——以甘肃省图书馆为例

西部地区图书馆在信息资源的结构、内容、地域配置等方面存在不足。甘肃省图书馆在拓展服务功能、提高资源使用效率等方面进行了有益的尝试,具有其实践意义。由此,西部地区图书馆应强化各级图书馆的延伸服务功能、加快基层文化阵地建设、充分依托文化共享工程、构建西部图书馆信息服务网络。     

A MINI－CAPACITANCE PROBE FOR MEASURING THE LOCAL VOID FRACTION IN GAS－SOLID FLUIDIZED BEDS

ＡＭＩＮＩ－ＣＡＰＡＣＩＴＡＮＣＥＰＲＯＢＥＦＯＲＭＥＡＳＵＲＩＮＧＴＨＥＬＯＣＡＬＶＯＩＤＦＲＡＣＴＩＯＮＩＮＧＡＳ－ＳＯＬＩＤＦＬＵＩＤＩＺＥＤＢＥＤＳＧｕｉＫｅｔｉｎｇ（归柯庭）ＨａｎＪｉｔｉａｎ（韩吉田）ＳｈｉＭｉｎｇｈｅｎｇ（施明恒）（Ｄｅ...