聚3-羟基丁酸酯-聚乙二醇共混改性微球的制备

以聚3-羟基丁酸酯(PHB)和聚乙二醇(PEG)共混物为原料,采用复乳化-溶剂蒸发技术制备微球.通过FTIR、DSC和SEM等手段研究了在微球基材中引入PEG对最终微球组成、结构以及表面形貌的影响.结果表明,通过该工艺可以在微球的基材中引入PEG,从而降低PHB结晶相的规整度;随着PEG/PHB质量比变化,微球结构和表面形貌差别明显,最优质量比为14时,微球的得率达到36.1%,微球表面呈多孔状态,内部为微球嵌套结构,预期可以达到较好的控释效果.     

文化富思特——富思特制漆(北京)有限公司董事长郭祥恩解读企业文化真谛

几次作为听众,聆听了富思特制漆(北京)有限公司董事长郭祥恩关于“推动精细化管理,打造精英化团队”的精彩演讲;在富思特成立十周年之际,又不经意间拜读了《富思特2005时代的音符》——一本耐人寻味的小册子。无论是郭总慷慨激昂的演讲,还是充满哲理的字里行间,无不透露着一股浓浓的文化氛围。而对于作为富思特公司决策者的郭祥恩,更能感觉到他是一位充满智慧与激情的文化引领者。论及企业文化,人们并不陌生,大至实力强大的世界级顶尖公司,小至名不见经传的小企业,都会有自己的企业文化,有自己的文化架构。但把文化作为一种信念、一种价值观…     

探讨未来发展战略 引领行业健康发展——“首届中国涂料行业高层论坛”在博鳌隆重召开

2006年11月30日,在富有南国风情的海南博鳌,各方人士及业届精英齐聚一堂,迎来了中国涂料行业的盛会——首届中国涂料行业高层论坛。这是中国涂料行业的盛事,它标志着中国发展史上一个战略转型期的到来。此次论坛由中国涂料工业协会和中华制漆(深圳)有限公司联合主办。特邀原化工部副部长、中国石油和化学工业协会名誉会长谭竹洲,海南省副省长姜斯宪,全国政协常委徐展堂先生,海南省政协副主席洪寿祥,中国涂料工业协会理事长王擢到会并致辞。中国涂料工业协会常务副理事长杨桓、副秘书长黄添源、专家委员会主任刘登良也出席了会议,有来自国内…     

Porous TiC Ceramics Derived from Wood Template

A porous TiC ceramic with a woodlike structure was prepared from wood template through tetrabutyl titanate vacuum-infiltration. The tetrabutyl titanate was first decomposed to TiO₂, and then in-situ reaction between TiO₂ and carbon template took place in the cellular wall at high sintering temperature. The original structure of wood was retained. In addition, the dimensional shrinkage of the pores after the removal of the residual carbon was different according to the difference of the wood density.     

湿法制造热塑性片材的工艺技术研究Ⅰ.热塑性片材概论

本文介绍了玻璃纤维毡增强热塑性片材（GMT）的特点，分类及制造工艺；阐述了湿法即介质悬浮法制造热塑性片材的工艺流程及专用设备。     

Estimation of the particle diffusivity in a liquid-solids fluidized bed based on a stochastic model

A simple method was developed for estimating the particle diffusivity or mixing coefficient in a liquid-solids fluidized bed from the variance (dispersion) of the number of particles in a given section of the bed during relaxation in the bed expansion. This variance was estimated from the pressure drop history above the location of the pressure sensor recorded continuously after the stepwise disturbance in the velocity of the fluidizing medium. The method has been verified by comparing the particle diffusivities obtained by the present method with the available data obtained by other methods.     

TRANSIENT ANALYSIS OF CRYSTALLIZATION: EFFECT OF THE SIZE DEPENDENT GROWTH RATE

The dynamics of the crystal size distribution in a continuous mixed suspension, mixed product removal crystallizer is modeled stochastically. The model is fairly general in that it involves a size-dependent growth rate function: this size-dependent growth rate as a possible cause of deviation on the behavior of the crystallizer from that of an idealized or simplified counterpart has been investigated based upon the model.     

Stochastic modeling of segregation in a motionless mixer

The mixing of particles with different characteristics is generally accompanied by segregation which prevents the particles from attaining the randomly mixed state. A discrete steady-state Markov chain model was employed to model the axial segregation of solid particles in a motionless mixer. Three systems containing particles of different sizes and/or densities were studied. One step transition probabilities of the model were experimentally determined. The model can predict the concentration profiles, the degrees of mixedness, and the equilibrium states of these particle systems blended by passing the particles through a motionless mixer. Experimental results are in good agreement with those predicted from the model.     

Optimal synthesis of process systems Necessary condition for optimal system and its use in synthesis of systems

The necessary condition for the optimal process system structure which includes both the optimal interconnection and optimal design of processing units is derived in terms of the structural parameters. The structural parameters are essentially splitting factors of process streams connecting processing units. The necessary condition requires the structural parameters and the design vectors to satisfy the weak maximum condition of the Hamiltonian type scalar functions. On the basis of the condition, a search method, evolutionary search for optimal structure (ESOS), for attaining the optimal structure starting from a simple structure is developed and its convergence is proved. An example of synthesizing a reactor-separator system illustrates its use.