纸上色层分离重量法测定铌铁合金中铌的改进

以国标《GB3654．1—83》方法为基础，试样采用氢氟酸、硝酸溶解后，适当调整展开剂配制比例，将其加大HF的浓度，降低HNO，的浓度，使用效果良好，缩短了密闭展开时间，提高了分析速度。     

聚丙烯／滑石粉复合材料的等温结晶动力学

用差示扫描量热法(DSC)研究聚丙烯(PP)及PP／滑石粉复合材料的等温结晶过程。用Avrami方程全面分析PP／滑石粉的等温结晶动力学，并由此获得相关的动力学参数；用Kissinger方程研究滑石粉对PP／滑石粉复合材料结晶活化能的影响。研究表明：加入滑石粉后明显提高PP／滑石粉复合材料的结晶速率和结晶度；证明滑石粉能促进PP材料的结晶，并在PP结晶过程中起到异相成核作用。PP／滑石粉复合材料的等温结晶过程属于典型的异相成核机理。     

乌溪江水电厂AGC功能的实现

介绍乌溪江水力发电厂AGC的设计原则、运行方式及功能实施,并对AGC试验过程中出现的问题进行详细探讨。图1幅。     

Bubble size measurement in three-phase system using photograph technology

A special experiment setup was designed to observe the interaction between bubbles and particle in flotation cell and to analyze the bubble characteristics such as bubble size, distribution and bubble-loading efficiency. Bubbles in water-gas system and three-phase system were measured. The results indicate that with the current setup the bubbles as small as 10μm can be easily distinguished. The average size of the bubbles generated under the given conditions in two-phase system is 410μm at frother concentration of 0. 004%, which is in good correspondence with the results of other works. The effect of frother on bubble size was probed. Increasing frother concentration from 0 to 0. 004% causes a reduction of bubble size from 700 to 400μm. The bubble loading efficiency was reported. The result indicates that the fine particle is more easily entrapped than the coarse particle. Some factors, which have effect on measurement accuracy were discussed. The aeration speed has a significant effect on the accuracy of results, if it surpasses 30 mL/s, and the image becomes unclear due to the entrapment of fine particle. Another factor, which can affect observing results, is the sampling position. At a wrong sampling position, the images become unclear.     

长输燃气管道泄漏主要原因及防范措施

以义马-郑州长输燃气管道为例,分析了长输燃气管道泄漏的主要原因,探讨了管道燃气泄漏的防范措施.     

解读空间中的权力

在空间实践中,权力有时需要被强调,有时则需要极力避免。本文主要从权力的空间表述,权力与空间的对话,以及权力空间典型分析等三方面对空间中的权力进行解读,探讨空间权力产生的机制及其影响因素,为不同的空间设计实践提供一定的理论依据。     

矿物颗粒溶液化学行为与其表面性质

本文从溶液化学的角度,阐述矿物颗粒溶液化学行为与其表面性质的关系及其对浮选的影响,如矿物的溶解、表面电性、表面化学性质、疏水一一亲水性质、分散与絮凝行为,建立起系统的浮选溶液化学理论。     

一水硬铝石与高岭石、叶蜡石和伊利石浮选分离中晶体结构的作用

测量了高岭石、伊利石、叶蜡石和一水硬铝石在阳离子捕收剂反浮选时的润湿性和动电行为。通过分析矿物的晶体结构,对测量结果进行了解释。根据矿物的晶格参数计算了矿物的零电点,计算的零电点值与试验测得的等电点值有很好的吻合。等电点测量值和零电点计算值的减小顺序为:一水硬铝石>高岭石>伊利石>叶蜡石,这与Al-O断裂键数目以及Al-O断裂键数目与Si-O断裂键数目的比值减小顺序基本一致。阳离子捕收剂在矿物表面上的吸附作用主要为静电作用。反浮选分离含铝硅酸盐矿物和一水硬铝石获得了满意的结果。     

钢铁产品圆形拉伸试样加工刀具的改进

针对目前圆形拉伸试样车削操作繁琐、进给量小、切削力大、刀具消耗大及加工效率低等问题,不能满足钢厂钢铁产品快速检验、降低检验成本的要求,对原来的切削加工刀具进行了改进。将原来的75°偏刀改为60°尖刀,取消了原来的90°右偏刀,将宽刃修光刀改造为切断刀,将圆弧刀增加修光刃代替宽刃修光刀与圆弧刀。应用实践表明,改进后的刀具使用更方便,不仅能提高试样的加工质量和加工效率,还能减少加工消耗、降低检验成本。