纳米铜粉在乙醇溶液中的团聚规律

研究了纳米铜粉在乙醇溶液中团聚的影响因素及其规律。结果表明:随着静止时间的延长,纳米铜粉的团聚粒径逐渐增大,粒径的分布范围先是增大,当团聚达到动态平衡后又逐渐变小;当团聚达平衡状态时,纳米铜粉的平均粒径随其质量分数的增加而增大,但当质量分数达到一定值时平均团聚粒径就达到极限;纳米铜粉在悬浊液中的团聚速率随纳米铜粉质量分数的增大而增大。     

东山瘦煤灰熔聚气化工艺特点

本文介绍了东山瘦煤在Ф１ｍ灰熔聚流化床粉煤气化装置上的试验运行及其工艺特点。试验结果表明：该煤种在灰熔聚和细粉循环的条件下，控制反应温度在１０８０±１０℃和表压０．３ＭＰａ下能达到稳定连续操作。     

Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment

Agglomerated nanocrystalline ZrO2-8%Y2O3 powder prepared by spray drying was heat-treated in air at temperatures from 1 200 ℃ to 1 400 ℃ for 2 h. Scanning electron microscopy was used to examine the changes of particle size and morphology, and X-ray diffraction was used to analyze the change of constituent phases before and after the high temperature heat treatment. Nano-particle growth behavior was also investigated. The results show that the major constituent phase of the agglomerated nanocrystalline powder is tetragonal, and non-uniform growth of the nano-particles occurs while the heat treatment temperature reaches 1 300 ℃. This non-uniform growth phenomenon is related with the inhomogeneous distribution of Y2O3 in ZrO2. Nano-particles grow into micron particles through the mechanisms of gradual merging of nano-particles in some areas and sudden merging ofnano-particles in other areas.     

顺丁橡胶生产中凝聚效果的影响因素探讨

主要讨论在顺丁橡胶生产过程当中,凝聚釜搅拌、挡板、胶液及蒸汽喷嘴和凝聚釜操作温度、压力,胶含量,水胶比,胶粒大小以及汽提剂对橡胶胶液凝聚的影响,分析和讨论各因素的相互制约作用关系,并提出了一些合理化的建议。     

全密度聚乙烯装置振动筛堵孔机理与解决对策

目前,潮湿细粒物料的堵塞筛孔是筛分作业中经常遇到的难题,造成筛孔堵塞的因素有很多。本文论述了国内线性低密度聚乙烯装置挤压机组中振动筛在实际筛分过程中经常出现的多种问题,主要针对筛孔堵塞这一问题作出了详细的分析,由于物料特性、物料表面水分的含量以及筛网结构等原因造成筛分过程中物料容易黏附在筛网上或者一些筛孔被粒径大或形状不规则的物料颗粒堵塞,导致筛分效率下降,甚至有时候需要停机进行清理,严重影响了筛分作业的顺利进行。为了解决这一问题,对振动筛筛网结构进行优化设计,通过提高振动筛的振动强度来减缓筛网的堵塞情况,提高筛分效率,同时采用弹簧装置降低振动筛带来的噪声,体现了环保要求。并指出了标准化、系列化、通用化、低噪声是细粒难筛物料筛分机械的发展趋势。     

BB肥生产及产品粉化、潮解、结块原因分析

介绍了BB肥生产流程的特点、BB肥对原料要求，以及我公司前期BB肥生产的产品出现潮解、粉化、结块等质量问题，并从内在和外在两方面对产生这些质量问题原因进行了详细分析，同时提出改善措施，有效地提高我公司BB肥产品质量．增加了市场竞争力。     

Role of stabilizers on agglomeration of debris during micro-electrical discharge machining

Micro-electrical discharge machining (µ-EDM) as an advanced mechanical micro-machining method has been widely used in the generation of micro-features by removing debris through melting and evaporation phenomena, and during this time some amount of debris is dispersed in the dielectric medium. These debris are treated as unwanted materials and later will be disposed of from the system. But, after critical evaluation of the debris through transmission electron microscope (TEM), it is found that the debris are agglomerated and in the size range of 40–600?nm (mean size: 242?nm). This makes curious to search for any alternatives to overcome the agglomeration to result into ultrafine particles in the range of nanometres. In the present article, an attempt has been made to incorporate ultrasonication during machining process and also resorted to use stabilizers. As per chemistry aspect of metallic aluminium particles, Poly Ethylene Glycol (PEG), Bael Gum (BG) and ACacia Gum (ACG) stabilizers are used along with deionized (DI) water and studied their effect individually on the interaction between the nucleated nanoparticles. The characterization results reveal that using PEG, BG and ACG, the debris of aluminium generated are in the size range of 45–500?nm (mean size: 196?nm), 25–70?nm (mean size: 45?nm) and 3–30?nm (mean size: 10?nm), respectively. ACG stabilizer was found to be strongly reduce the agglomeration resulting in excellent stable dispersion of the colloidal aluminium nanoparticles. The nature of colloidal samples was studied by ultraviolet–visible (UV–vis) spectroscopy after 2 weeks of their generation. Furthermore, thermal conductivity and viscosity properties are ascertained, and the heat transfer effect has also been studied experimentally using a developed thermal management system. The obtained results are presented in the article.     

长株潭城市群构建过程中的行政区划调整

行政区划调整是推进城市群一体化进程不可忽视的一个重要手段。在长株潭城市群的构建过程中,长株潭城市群的行政区划不断地调整以适应经济体制的改革,适应区域一体化的需要,适应建设"两型"社会的要求,推动着长株潭城市群的发展。随着长株潭城市群的发展,长株潭城市群的行政区划还将不断地调整。     

Production technology and agglomeration for Japanese prefectures during 1991–2000*

We analyse the seemingly unrelated regression (SUR) models with spatial dependencies from a Bayesian point of view and estimate the parameters of the models using a Markov chain Monte Carlo (MCMC) method. Further, we analyse the production technology and the economics of agglomeration in Japanese prefectures from 1991 to 2000, simultaneously taking into account spatial and serial correlation. Model comparison is done via log‐marginal likelihoods, and it is found that the spatial error SUR model is the best model and that the economics of agglomeration and spatial heterogeneity decreased over this decade. Resumen. Analizamos modelos de ecuaciones aparentemente no relacionadas (SUR, siglas en inglés) con dependencias espaciales desde un punto de vista bayesiano y estimamos los parámetros de los modelos utilizando el método de Monte Carlo basado en cadenas de Markov (MCMC). Además, analizamos la tecnología de la producción y las economías de aglomeración en prefecturas japonesas desde 1991 a 2000, teniendo en cuenta simultáneamente la correlación espacial y serial. La comparación de modelos se realiza mediante verosimilitud log‐marginal, y se encontró que el error espacial del modelo SUR es el mejor modelo y que las economías de aglomeración y la heterogeneidad espacial disminuyeron durante esta década.      

青岛市产业结构升级空间策略研究

一个城市要想持续保持较强的竞争力,产业结构升级是永恒的主题.通过"产业梯度转移"、"企业生产转包"和园区集聚,可以进一步优化青岛产业的空间布局,同时促进青岛产业结构升级,使青岛经济保持较强的竞争力,并有利于实现城乡协调发展.