Science Letters:On the critical radius in generalized Ostwald ripening     

王勤波  ROBERT Finsy  徐海波  李希 《Journal of Zhejiang University. Science. B》2005,6(8)

INTRODUCTION A polydisperse precipitate produced by nuclea-tion in a metastable supersaturated solution is far from thermodynamic equilibrium, i.e. a state of minimal free energy. A decrease of free energy is accom-plished by a coarsening of the precipitate which es-sentially reduces the surface free energy with respect to the surrounding solution. The process is called Ostwald ripening and is a direct consequence of the Kelvin effect (Adamson and Gast, 1997), that is the higher solubi…  相似文献   

Enhancing the quality metric of protein microarray image     

王立强  倪旭翔  陆祖康  郑旭峰  李映笙 《浙江大学学报(A卷英文版)》2004,5(12):1621-1628

The novel method of improving the quality metric of protein microarray image presented in this paper reduces impulse noise by using an adaptive median filter that employs the switching scheme based on local statistics characters; and achieves the impulse detection by using the difference between the standard deviation of the pixels within the filter window and the current pixel of concern. It also uses a top-hat filter to correct the background variation. In order to decrease time consumption, the top-hat filter core is cross structure. The experimental results showed that, for a protein microarray image contaminated by impulse noise and with slow background variation, the new method can significantly increase the signal-to-noise ratio, correct the trends in the background, and enhance the flatness of the background and the consistency of the signal intensity.  相似文献   

Effect of particle loading on heat transfer enhancement in a gas-solid suspension cross flow     

周劲松  骆仲泱  高翔  倪明江  岑可法 《浙江大学学报(A卷英文版)》2002,3(4):381-386

Heat transfer between gas-solid multiphase flow and tubes occurs in many industry processes, such as circulating fluidized bed process, pneumatic conveying process, chemical process, drying process, etc. This paper focuses on the influence of the presence of particles on the heat transfer between a tube and gas-solid suspension. The presence of particles causes positive enhancement of heat transfer in the case of high solid loading ratio, but heat transfer reduction has been found for in the case of very low solid loading ratio (M _s of less than 0.05 kg/kg). A useful correlation incorporating solid loading ratio, particle size and flow Reynolds number was derived from experimental data. In addition, thek-∈ two-equation model and the Fluctuation-Spectrum-Random-Trajectory Model (FSRT Model) are used to simulate the flow field and heat transfer of the gasphase and the solid-phase, respectively. Through coupling of the two phases the model can predict the local and total heat transfer characteristics of tube in gas-solid cross flow. For the total heat transfer enhancement due to particles loading the model predictions agreed well with experimental data. Project supported by National Natural Science Foundation for Distinguished Young Scholars (No. 50025618)  相似文献   

使用FIR互补结构的分支滤波器     

江太辉 《五邑大学学报(社会科学版)》1987,(2)

本文讨论互补滤波器的原理,导出FIR互补结构的分支滤波器的实现方法,并给出设计实例。  相似文献   

40Ar15+轰击金属表面的X射线发射谱     

许振武  郭秋芬  张小安 《咸阳师范学院学报》2005,20(6):18-20

报道了利用兰州重离子加速器国家实验室ECR离子源引出的全裸Ar15 离子与Be和Mo固体表面相互作用产生的X射线实验测量结果。结果发现,同样条件下,对于较重的靶原子容易激发其外壳层特征X射线,产额很高。  相似文献   

单块电流传输器实现的Q增强二价滤波器     

梁荣新  王跃英 《茂名学院学报》1992,(1)

本文提出了一种用单块有源CCⅡ实现的新型有源网络,它可以实现二阶高通、低通和带通滤波器,其特点是电路的W。和Q值可分别由两个接地元件独立调节。  相似文献   

浅析中国古代文论现代转换的视角问题     

白晶玉 《鞍山师范学院学报》2008,10(5)

中国古代文论现代转换的视角应该建立在接受与过滤的基础上。在目前的文化语境下,我们应将更多的目光关注在过滤上。这是由三方面决定的:一、中国古代文论自身特点决定的;二、当代文论的发展要求的;三、文艺学建构的历史性要求决定的。过滤的方式我们则应采取比较与对话的途径和他者视角来实现。  相似文献   

格蕴涵代数的布尔滤子     

吴明慧  徐扬 《毕节学院学报》2011,29(4):1-5

提出布尔滤子的概念,研究它的一些基本性质,得到由布尔滤子所诱导的商代数是布尔代数的结论,同时给出了判定布尔滤子的等价条件,得到格蕴涵代数中布尔滤子与关联滤子一致的结论。  相似文献   

Optimal choice of parameters for particle swarm optimization   总被引：26，自引：0，他引：26  

张丽平  俞欢军  胡上序 《浙江大学学报(A卷英文版)》2005,6(6):528-534

INTRODUCTION Particle swarm optimization (PSO) is one of the evolutionary computational techniques. Since its introduction (Kennedy and Eberhart, 1995; Eberhart and Kennedy, 1995; Eberhart et al., 1996), PSO has attracted much attention from researchers around the world. It is a population-based search algorithm and is initialized with a population of random solutions, called particles. Each particle in PSO moves over the search space at velocity dynamically adjusted according to th…  相似文献   

Prediction of wall deposition behaviour in a pilot-scale spray dryer using deposition correlations for pipe flows     

KOTA K LANGRISH T.A.G 《浙江大学学报(A卷英文版)》2007,8(2):301-312

INTRODUCTION Abbott (1990) reported that wall deposition inspray dryers may pose a potential fire risk and com-promise hygiene requirements, and reduce productquality and yield. Spray dryer hazards include igni-tion of explosible dust clouds, dust deposits, bulkpowder deposits and flammable vapour. Kieviet(1997) noted that wall deposition affected the resi-dence time distribution of particles, and particularlythat an important factor in determining residencetimes with high wall deposition…  相似文献