氨浸 - 碳化法制活性氧化锌

对以菱锌矿为原料，用硫化碱为除杂剂，二氧化碳为沉锌剂的活性氧化锌制备方法进行了研究，重点考察了除杂和碳化沉锌过程的工艺条件，实验得出，除杂时硫化碱加入量为理论量的120％较好；碳化沉锌终点定在pH值为8时较为适宜；碳化时采用较低的温度，较高的二氧化碳浓度和较高的空塔气速（0．04－0．05m/s)为宜。     

洁净钢制备技术的研究现状及发展

介绍了洁净钢制备技术研究现状,包括生产工艺、钢中杂质元素(S、P、O、N、H)的去除和非金属夹杂物的控制,对于洁净钢的未来发展趋势也进行了展望。     

提高洗煤厂对标管理的探讨

从对标管理实施的前提条件、步骤和注意的几个问题等方面对对标管理进行了简要的说明.     

成庄矿瓦斯综合治理措施探讨

针对成庄矿煤层瓦斯含量高并有煤与瓦斯突出危险性的问题,实施了地面煤层气井抽放、井下区域性预抽、通风系统优化改造和提升瓦斯抽采系统能力等综合治理措施,应用结果表明,成庄矿2004-2010年,在绝对瓦斯涌出量增大了78.11％、相对瓦斯涌出量增大了27.74％的情况下,风排瓦斯量仅增大了6.35％,抽采瓦斯量增大了197.05％,大幅度降低瓦斯事故发生概率的同时瓦斯抽采效果显著提高.     

Fabrication of Densely Packed AlN Nanowires by a Chemical Conversion of Al2O3 Nanowires Based on Porous Anodic Alumina Film

Porous alumina film on aluminum with gel-like pore wall was prepared by a two-step anodization of aluminum, and the corresponding gel-like porous film was etched in diluted NaOH solution to produce alumina nanowires in the form of densely packed alignment. The resultant alumina nanowires were reacted with NH₃ and evaporated aluminum at an elevated temperature to be converted into densely packed aluminum nitride (AlN) nanowires. The AlN nanowires have a diameter of 15–20 nm larger than that of the alumina nanowires due to the supplement of the additional evaporated aluminum. The results suggest that it might be possible to prepare other aluminum compound nanowires through similar process.     

羟丙基瓜尔胶的性能及其在牙膏中的应用

羟丙基瓜尔胶是由天然瓜豆粉经化学改性（引入水溶性非离子基团）的非离子型粘合剂，它具有优良的耐盐性，良好的触变性，以及能适应较宽pH值范围的特性，属于非牛顿流体中的假塑性类型，用它制成的牙膏可以改变它的流体性能而膏体表面光亮。细腻，成条性好，是一种很好的牙膏粘合剂。     

Manganese-based catalyst for NO removal at low temperatures: thermodynamics analysis and experimental validation

Abstract

Selective catalytic reduction of nitrogen oxides with loaded urea is a novel method for removing NO under excess oxygen and low temperature conditions. In present work, a comprehensive thermodynamic study for NO removal is executed based on the Gibbs free energy change. This research mainly includes the detailed analyses of NO removal mechanism, the feasibility analyses for manganese as the active element and the experimental study for synthesized manganese-based catalyst (preparation, characterization and performance test). The catalyst in present study can reach 82% NO conversion and near 98% N₂ selectivity at 50?°C, which validates the correctness of the thermodynamic calculations.     

Mechanism behind the Size Effect Phenomenon

Size effect (SE) on quasi-brittle fracture of concrete and concretelike heterogeneous materials has been commonly demonstrated by the influence of specimen size D on the transition from strength-dominant fracture to toughness-dominant fracture for geometrically similar specimens with a common initial-crack/specimen-size ratio, i.e., a0/D = constant. Under such a condition, size D appears to be the single controlling parameter for SE. In this study, we clarify that the primary source of quasi-brittle fracture, the presence of a large fracture process zone (FPZ) in front of a crack-tip, does not follow the condition of geometry similarity even for geometrically similar specimens. This suggests that the role of FPZ is not clearly explained for SE. Therefore, this study emphasizes the interaction between FPZ and the nearest specimen/structure boundary, and the consequent SE phenomenon. The deficiencies associated with the common SE models developed by Bazant and his coworkers are discussed through comparisons with the analysis on the boundary and FPZ interaction, or the boundary effect. It is shown that quasi-brittle fracture and the transition from strength-dominant fracture to toughness-dominant fracture can occur even if specimen/structure size D is constant, i.e., size D is not the dominant factor for SE.