微量Ag对Al-Cu-Mg合金显微组织与力学性能的影响

研究了Ag元素对Al-8Cu-0．5Mg合金显微组织、室温及高温力学性能的影响。结果表明：均匀分布在铝基体{001}面和{111}面上共存的θ′和Ω（成分为Al2Cu）沉淀相能对含Ag合金起强化作用；而不含Ag的合金只有θ′一种沉淀相。含Ag合金中小尺寸以及近间距的θ′和Ω沉淀相提高了室温及高温下合金的屈服强度和拉伸强度。然而，与不含Ag的合金相比，由于这种小尺寸及近间距的θ′和Ω沉淀相在变形过程中具有与基体的内在不相容性，含银合金的伸长率降低。     

ET-DecNT数控电极在LF炉中的应用

阐述了方坯LF炉ET-DecNT全数字控制电极的结构及特点。该控制系统的使用,简化了操作程序,使设备加热曲线稳定,精炼炉的钢水喷溅量少,缩短了钢水的处理周期,实现了高效、低耗、优质和多品种的最佳化生产。     

Operations on logic functions and variables through sign Haar spectra

A non-linear transform, called “sign Haar transform” has recently been introduced. The transform is unique and converts binary/ternary vectors into ternary spectral domain. Recursive definitions for the calculation of sign Haar transform are developed. Essential properties of logic functions and variables in the spectral domain of a quantized transform based on Haar functions are presented. Sign Haar transform has the smallest computational cost of all the quantized transforms. The properties of logic functions are listed for two different codings of incompletely specified functions.     

湖南浏阳永和海泡石作涂料添加剂的研究

该区出产的海泡石粘土呈灰白色，土质细腻，比重小，在水中不易受强电解质的影响，经粉碎和适当的漂白材料后加入涂料中，可明显改善涂料悬浮体系的稳定性，提高涂层的耐洗擦性和耐水性，与石灰膏配合使用，可制成成本与１０６涂料相当，而耐洗擦性大大优于１０６涂料的新内墙涂料，其耐洗擦性可达２０００次以上。     

广钢电炉粉尘分析及治理利用探讨

对广州钢铁厂含铅锌电炉粉尘进行了分析测定，提出将电炉粉尘用作水泥生产铁质校正料的设想，并进行了可行性试验。     

The Influence of Nitrogen and Boron Implant into Silicon Substrate on the Phase and Internal Stress of c-BN Films

Cubic boron nitride(c-BN) film was deposited on a Si (100) substrate by the RF-magnetron sputtering.The mainly problems for fabrication of c-BN films are the low purity and high intrinsic compressive stress. In order to solve the two problems, the c-BN film with the buffer interlayer was deposited on the substrate which had been implanted with nitrogen and/or boron ions. The results show: the implantation of nitrogen ions can obviously increase c-BN content and reduce the internal stress slightly; while the implantation of boron shows no obvious improvement to the content of c-BN, which can reduce the internal stress in the film obviously. In addition, it is suggested that the implantation of nitrogen and boron shows the best result, which not only can increase the content of c-BN, but also reduce the internal stress in the c-BN film obviously.     

A Study of the Effect of Aluminium on the Mechanochemical Reduction of Hematite by Graphite

The effect of addition of small amounts of aluminium on mechano‐chemical reduction of hematite by graphite was studied. Various amounts of aluminium (0 to 10%) were added to a hematite‐graphite mixture, in which C/O ratio was 1:1. The hematite‐graphite‐aluminium mixtures were then subjected to ball milling followed by heating up reduction. The heating up reduction was carried out in Ar atmosphere, using TG‐DTA device. In TG‐DTA experiments, samples were heated by a constant heating rate of 10 °C/min from room temperature up to 1100 °C and maintained for 30 minutes at this temperature. To clarify the reactions which took place during milling and heating up reduction, the samples were subjected to XRD examinations. It was found that the heat generated during exothermic reaction of aluminothermic reduction of hematite promoted the endothermic reaction of carbothermic reduction. In the course of heating up reduction, the carbothermic reaction occurred just after aluminothermic reaction. Increasing of aluminum content from 0 to 10% in 2 hours ball milled samples decreased the temperature of carbothermic reaction from 1020 °C to about 860 °C. The further ball milling of the samples up to 5 and 10 hours, for the samples containing 10 and 5% aluminium respectively, caused the decrease of the temperature of aluminothermic and carbothermic reactions to around the melting point of aluminium.     

Influence of V2O5 Addition on Reduction of NO by C3H6 over Pt/V2O5/Al2O3 Monolithic Catalyst

Pt/V2O5/Al2O3 and Pt/Al2O3 monolithic catalysts were prepared by wet impregnation method, and the influence of V2 O5 addition on the catalytic activity for NO reduction by C3 H6 under lean burn condition was investigated in detail.The results show that Pt/V2O5/Al2O3 has better activity of NO reduction than Pt/Al2O3 , adding V2O5 to Pt catalyst makes the temperature window of NO reduction shift further to a lower temperature region.The activity of NO reduction decreases and there is a similar degree of deactivation over the two catalysts in the presence of SO2 in feed gas.Moreover, adding V2 O5 to Pt catalyst resulted in improvement of resistance to SO2 oxidation, which decreases the emission of sulfate particulate.Thermal aging treatment counteractes the promoting effect of V2O5 on NO reduction.     

Tool addition strategies for flexible manufacturing systems

The allocation of tools to machines determines potential part routes in flexible manufacturing systems. Given production requirements and a minimum feasible set of tools, the decision of how to fill vacant slots in tool magazines to maximize routing flexibility is shown to be a minimum cost network flow problem for the cases when routing flexibility is a function of the average workload per tool aggregated over tool types, or of the number of possible routes through the system. A linear programming model is then used to plan a set of routes for each part type so as to minimize either the material handling requirement or the maximum workload on any machine. The impact of these tool addition strategies on the material handling and workload equalization is investigated and computational results presented. The advantage of the overall approach is computational simplicity at each step and the ability to react to dynamic changes.This article is based upon work supported by the National Science Foundation under Grants No. DMC 85–44993 and DDM 92–15432.This work was done by the author while visiting the SIE Department of the University of Arizona.     

Polymer grafted multiwalled carbon nanotubes via facile in situ solution radical polymerisation

A facile strategy to graft polymers onto the surfaces of multiwalled carbon nanotubes (MWCNTs) was developed via the free radical addition process in the solution radical polymerisation of styrene in presence of the MWCNTs without any pretreatment so that the length of the original MWCNTs remained unchanged. The polystyrene grafted MWCNTs were characterised with Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis (TGA) and transmission electron microscopy techniques. The effect of the amount of the initiator added and of the polymerising temperature on the percentage of grafting (PG%) and conversion of monomer (C%) were calculated from the TGA results. It was found that the maximum PG% of 15.6% was achieved with 0.5% initiator added and the higher polymerising temperature favoured the grafting polymerisation. The proposed method is expected to be extended to other vinyl monomers and offers another diverse way for the sidewall functionalisation of MWCNT.