ANSYS软件在调节阀阀芯型线设计中的应用

调节阀中不同阀芯型线可得到不同的流量特性。本文用ANSYS程序中的FLOTRAN CFD对几种阀芯型线在各开度下构成的阀道结构模型进行分析，得出不同阀芯在各开度下的流量系数。从而得到符合不同工况下的流量特性曲线，该方法可帮助解决阀芯型线设计，缩短设计和加工周期。     

褐煤气化技术评述

移动床、流化床和气流床等煤气化技术都可应用于褐煤气化,褐煤的煤种特征对不同的煤气化技术有不同的适应性,不同的煤气化技术对褐煤气化前的处理有不同的要求。主要从煤种特征、不同炉型对入炉煤的要求方面,就当前典型的煤气化技术应用于褐煤气化的情况进行了评述。并对褐煤地下气化技术进行了简单介绍。     

石膏对不同水泥胶凝性能的影响

石膏是水泥体系的一个重要组分,而不同的石膏对不同的水泥体系的影响也是相当复杂的.本文采用二水石膏和煅烧石膏对不同的水泥体系进行较系统的试验,并从机理上分析不同石膏类型及掺量对不同水泥体系的影响,研究结果表明,不同类型和掺量的石膏对不同水泥体系的增强作用是不同的,同时煅烧石膏比二水石膏更大程度地降低了水泥体系的流动度,优...     

Quantum-chemical description of the active sites for the selective oxidation of hydrocarbons

Different aspects of quantum chemical modelling of catalytic systems are discussed. Further, the electronic structure of various V_nO_m clusters representing the vanadium pentoxide (010) surface is studied and the reactivity of different surface oxygen sites with respect to adsorption of hydrogen as well as propylene is examined. Results of ab initio HF and DFT calculations are compared with those of the semiempirical INDO-type method. It is found that the different quantum chemical methods lead to the same qualitative results. Satisfactory convergence in cluster properties is achieved for clusters of ten vanadium atoms. The saturation of dangling bonds by hydrogen atoms does not influence the properties of the oxygen centers significantly. Among different oxygen centers the oxygens bridging two bare vanadium atoms are most negatively charged. Hydrogen binds to all inequivalent oxygen sites with the strongest binding occurring for oxygens bridging two vanadium atoms. INDO cluster studies for propylene adsorption/reaction on V₂O₅ (010) show that different approaches of the molecule to the surface yield different surface complexes which can then react to form different products.     

硅橡胶海绵材料孔隙结构对力学性能的影响

采用不同方法制备了两种密度且孔隙率相近、孔隙结构不同的硅橡胶海绵材料,表征了其孔隙结构的差异,研究了两种孔隙结构明显不同的硅橡胶海绵材料力学性能的差异。结果表明。硅橡胶海绵材料的孔隙结构对拉伸强度、拉断伸长率、压缩应力应变及压缩应力松驰等力学性能有较大的影响。     

有色阻燃异径聚酯FDY热收缩率的探讨

以阻燃聚酯切片与高色牢度色母粒为原料,制备了有色阻燃异径聚酯全拉伸丝(FDY),重点探讨了工艺条件对其热收缩性能的影响。结果表明:在试验范围内,有色阻燃异径聚酯FDY的热收缩率较有色普通异径聚酯FDY的高;拉伸温度对有色阻燃异径聚酯FDY热收缩率的影响很小,而定形温度与纺丝速度对其影响较大,且有色阻燃异径聚酯FDY的热收缩率随定形温度的升高而下降,随纺丝速度的降低而降低。     

二维磁畴结构形成的蒙特卡洛方法研究

采用含长程相互作用以及各向异性能的哈密顿,应用蒙特卡罗方法对二维结构系统在不同参数下的磁结构进行了计算和模拟,发现系统的微观磁结构与长程交换耦合系数密切相关,在不同作用下系统呈现了不同的磁畴结构。     

Investigating the effect of texture on the performance of color difference formulae

To predict the perceived color differences, the effect of the surface texture on the performance of the color difference formulae was investigated. To this end, knitted polyester fabrics with eight different textures were prepared. The fabrics were dyed by seven dyestuffs in five different depths. The selected pairs from the five samples with different depths in each hue covered small to large color differences. The assessed pair of samples had the same texture and hue, but different depths. A panel of 23 observers assessed the color differences of the pairs by gray scale method. The results showed that for the textile samples with different texture structures, the CIEDE2000 (2:1:1) performed the best followed by CMC (2:1:1), CIE94 (2:1:1), and CIELAB with approximately same performance. In addition, the magnitude of color difference influenced the ability of the formulae to predict the visual assessments and the best performance obtained for medium color differences. The comparison between eight different texture groups indicated that the texture structures of the pairs significantly affected the performance of the color difference formulae. For instance, the PF/3 measures obtained for the eight texture groups by CIEDE2000 (2:1:1) color formula could be varied between 21.98 and 33.37 PF/3 units. © 2009 Wiley Periodicals, Inc., Col Res Appl, 2010.     

Effect of the Porous Structure of a Catalyst on the Rate of Its Deactivation in the Claus Reaction

The effect produced by the content of different size pores and the diameter of a catalyst grain on the deactivation rate has been estimated based on the experimental data on the conversion of H₂S in the Claus reaction. Catalysts with different pore size distributions have been used for analysis. Deactivation has been shown to occur in different fashions for a fine catalyst fraction and catalyst grains. A mathematical model that describes the process of deactivation has been proposed.     

高活性氧化镍对搪瓷气泡结构的影响

本文研究了不同的烧成时间,添加活性氧化镍后搪瓷底釉的气泡结构所产生的变化,并对活性氧化镍作用机理作了一定的探讨,它有助于搪瓷均匀气泡结构的形成。     

稠油热采井口光杆密封装置的研究与应用

针对克拉玛依619区稠油开采中井口普遍出现跑油的问题，分析了跑油的原因，提出了根治跑油的办法，并设计制造出不同类型的井口密封装置及密封材料，试验研究表明，根据不同工况选择不同的装置及密封材料对筒油热采井口是行之有效的。     

基于共注成型原理的多色仪表盖注塑模具设计

介绍了共注成型工艺及设备工作原理,并将其应用于多色仪表盖的成型与模具设计中。通过对塑件材料及结构的工艺性分析,采用多色多模清色注塑方式,布置一模六腔两个模位两个不同的浇注系统,实现1个成型周期中多种色彩塑料3个塑件的同时注射,并利用转盘机构与偏心顶出机构实现先后两个模位成型多色仪表盖并顺利脱模的过程。     

硝酸钠卤水沸点变化的研究

本文系统研究了新疆罗布泊硝酸钠矿生产硝酸钠过程中获得的含硝酸钠卤水的沸点在不同组成、不同压力下的变化。结果表明．压力降低．含硝酸钠卤水的沸点也降低。     

不同牌号聚乙烯-应力应变曲线简析

材料的脆性韧性断裂行为转变,可以通过应力-应变曲线状态进行区分,也可延伸为对材料结构的判断。本文对不同牌号聚乙烯进行3种不同拉伸速率的拉伸实验,通过对应力-应变曲线进行分析,对不同牌号聚乙烯的结构特性进行初步对比判断。     

聚丙烯熔融接枝改性研究

采用熔融接枝的方法,研究了多组分体系下不同单体熔融接枝聚丙烯的性能。结果表明:在共单体苯乙烯、引发剂和聚丙烯相同的条件下,接枝物的极性均较未接枝的聚丙烯极性增加;不同单体所得接枝物的接枝率不同;熔体流动速率的降低使接枝物的加工性能有不同程度的下降。接枝物极性增加的趋势依次按接枝单体MAH、MMA、GMA递增。接枝物的偏光显微镜分析表明,接枝支链的生成可以促进聚丙烯的异相成核,使晶粒细化。     

流速对磁场阻垢效果的影响

利用双道的实时监测系统,通过监测碳酸钙过饱和溶液中的pH和Ca2 浓度在析晶过程中的变化,系统的研究了不同流速下磁场的阻垢效果.准确、可重复的试验数据表明,磁场对碳酸钙过饱和溶液有阻垢效果,并且不同流速下磁场的阻垢效果不同.同时试验结果还表明在磁处理时间恒定的条件下,在0～6 m/s的流速范围内,溶液通过磁场的流速越高磁处理的阻垢效果越强.     

电去离子膜堆不同运行方式的探讨

对电去离子膜堆制备高纯水的不同运行工艺进行大量的试验研究。电去离子作为高纯水制备领域的新技术．在运行工艺上还有很多需要进一步探讨的方面。作者简单介绍了电去离子技术的原理,并就电去离子膜堆在运行过程中其浓水的排放方式、入水水质的影响、膜堆的强制再生以及膜堆的连续运行等方面进行了详细的工艺研究。     

On the Structure of Triglycerides in the Liquid State and Fat Crystallization

Based on X-ray diffraction and Raman spectroscopy studies of trimyristin, a structure of triglycerides in the liquid state is proposed. The order in the melt is quite constant, even if the temperature is raised as much as 40° C above the melting point. The homologue series of simple triglycerides, together with 1-monomyristin and 1,2-dimyristin have been studied with the same techniques. The order of different segment in the hydrocarbon chains varies when different chain length, i. e. a long chain is more disordered at the methyl endgroup plane compared with a short one. The crystallization of triglycerides is also discussed based on diffraction pattern versus temperature studies. Due to different cooling rates and different chain length a melt can crystallize not only in α but directly in β' or β.     

单种强黏结性肥煤的配煤实验及黏结指数变化分析

将半焦、焦粉、主焦煤以不同的比例,配入新疆焦煤集团强黏结性肥煤中,进行黏结性实验,实验结果表明,焦煤和经低温干馏处理过的半焦在配入比例5%以内时,配合煤的黏结指数并未遵循低于最高黏结指数的一般规律;不同温度干馏的半焦其配合煤的黏结指数不同。通过实验验证,强黏结性的肥煤对无黏结性的半焦会产生非常强的黏结性,这对于动力煤的半焦的配煤炼焦具有一定的实践意义。     

丙烯酸聚氨酯夜光涂料的工艺研究

制备了以丙烯酸聚氨酯为基料的夜光涂料,系统研究了不同种类、不同粒度的夜光粉,以及不同颜色底材,不同涂膜厚度等因素对涂膜发光性能的影响。