ECR微波放电氩离子输运过程的研究

建立了电子回旋共振（ＥＣＲ）微波放电等离子体中离子输运过程的蒙特卡罗模型，考虑了离子与中性原子的电荷交换碰撞和弹性碰撞，以及精确依赖于离子能量的电荷交换和动量转移截面，模拟了源于氩气ＥＣＲ微波放电的氩离子向衬底输运的过程，得到与实验报道相符的模拟结果。     

高分子聚合物和流体的减阻

本文综述了高分子聚合物减阻剂的研究发展过程、减阻剂的应用及有效的聚合物减阻剂等情况。     

化学气相沉积聚合制备羧基取代聚对亚苯基二亚甲基及其性能研究

用化学气相沉积(CVD)聚合法制备了羧基取代聚对亚苯基二亚甲基(PPX-carb)膜,采用FTIR和元素分析的方法证实了其化学结构.对膜溶解性和抗化学氧化性能的研究表明PPX-carb膜仍具有优异的耐溶剂性和抗化学氧化性能.对PPX-carb膜热性能的研究表明羧基的引入使得膜的玻璃化转变温度降低,室温柔性增强,动态力学阻尼性能增大,与聚对亚苯基二亚甲基(PPX)相比引入了羧基的PPX-carb热稳定性有所下降,热降解起始温度比PPX低,但主链降解温度比PPX反而高出约80℃.此外,羧基的引入使得膜的亲水性能大幅度提高,水汽渗透性能也有所提高.     

Using Gamma-Radiation for Drug Releasing from MWNT Vehicle

A drug delivery system via multi-walled carbon nanotube （MWNT） vehicle was synthesized in aqueous solution. MWNTs were first noncovalently functionalized with chitosan oligomers （CS） with a molecule weight of 4000-6000, making MWNTs water-soluble, and then a cancer ancillary drug tea polyphenols （TP） was conjugated mainly via the hydrogen bond between CS and TP molecules, making MWNTs efficient vehicle for drug delivering. The release of drug molecules can be realized by pH variation and γ-radiation, leading to new methods for controlling drug release from carbon nanotubes carrier. Due to the high penetrability of γ-rays, γ-radiation shows up new opportunities in controlled drug release, possibly facilitating the future cancer treatment in vivo.     

关于颗粒悬浮机理和悬浮动的讨论

从分析气体分子的悬浮和静水中Ｂｒｏｗｎ微粒的悬浮之机理出发，论述了重力场中粒子（分子、微粒等）的悬浮不一定需要其它外力，粒子本身的任何形式的无规则运动，达到一定强度后都能使粒子弥散悬浮．河流中的泥沙颗粒和气（水）力输送管道中的颗粒的悬浮也主要靠颗粒物的无规则运动．作用于颗粒的升力和其它力可改变颗粒悬浮沿高度的分布，但仅用这些力（若无任何无规则运动）无法解释颗粒的弥散悬浮状态．讨论了颗粒对流动阻力的双重作用：支持颗粒悬浮的湍流脉动因引入颗粒而削弱，这是颗粒的减阻作用；颗粒增阻的一个主要机制是，流体给予颗粒的水平动量在颗粒一壁面碰撞中不断地损失．用悬浮动概念解释颗粒引起的增阻是不正确的．     

Special issue on conveying and handling of particulate solids–Challenges of discrete element simulation,application and calibration

<正>A series of international Conveying and Handling of Particulate Solids(CHoPS)conferences was initiated in Herzliya,Israel in 1995and has since proceeded with six successive conferences held in Jerusalem(1997),the Dead Sea(2000),Budapest(2003),Sorrento(2006),Brisbane(2009)and Friedrichshafen(2012).The conference series covers processes involving particulate solids,for example     

室温水汽对Au/TiO2上光催化分解臭氧的影响

 采用沉积-沉淀法制备了Au/TiO2光催化剂,并用紫外-可见漫反射光谱和X射线光电子能谱对其进行了表征,详细考察了室温水汽的引入对Au/TiO2光催化分解臭氧活性的影响. 结果表明,同干燥状态时相比,室温引入水汽后催化剂活性较低,并且较快地达到了稳定值. 催化剂的O 1s和Au 4f的XPS分析结果表明,水汽的存在导致TiO2的表面结构发生变化,进而使金-载体之间的相互作用力减弱. 这是导致催化剂活性下降的主要原因.     

FACTORS AFFECT THE RELEASE OF PSEUDOEPHDRINE HYDROCHLORIDE FROM THE UNCOATED CATION EXCHANGE RESIN—BASED DRUG DELIVERY SYSTEM IN VITRO

In this paper,it was investigated that the effect of parameters such as the ionic strength,pH.counter-ion type of release medium,particle size.and cross linkage of cation exchange resin on the release of model drug pseudoephedrine hydrochloride(PE) from uncoated drug-resin complex.The drug-resin complex was pepared by the reaction of PE with strongly acidic cation exchange resin(001&#215;4,001&#215;7,001&#215;14） .The result showed that the loading of PE increased with the increase of temperatures.The release of PE from drug-resin complex at 37℃ was monitored in vitro.From the experiments,it was found that the release rate of PE depends on the pH.comosition of the releasing media,increased at lower pH media or with increase of ionic strength of media.Moreover,the release rate of PE was inversely proportional to the cross-linkage and particle size of the cation exchange resin.     

消除水汽吸收峰干扰的红外光谱测量方法

红外光谱测量时,水汽吸收潜带常掩蔽重要的样品光谱信息.克服水汽干扰的方法有真空技术、干燥气体吹扫技术、样品穿梭技术、光谱差减技术和水汽补偿湿度滴定方法等.该文重点评述了新近发展的用于除去水汽噪音的湿度滴定法.不同于以往方法,该方法允许水汽带在光谱采集前期出现,并根据水汽吸收带的大小和正负方向,适时向光谱仪样品室通入干燥...