Physicochemical principles behind the preparation of high-purity arsenic compounds from lewisite detoxification products

High-purity arsine suitable for the growth of gallium arsenide-based epitaxial heterostructures has been prepared by processing a lewisite detoxification product: hydrolytic sodium arsenite. The proposed method involves the dissolution of hydrolytic sodium arsenite in water; electrolysis of the solution, resulting in the formation of arsenic acid and sodium hydroxide, which is subsequently used to absorb released chlorine; electrochemical arsine synthesis from the arsenic acid; and arsine purification by fractionation to a level of 99.9999%.     

计量供热多水泵并联管网的调试与运行

本文列举了多水泵并联供热管网运行调试用到的基本理论和计算公式,对一个住宅小区供热外网初步测试数据进行了分析,发现系统失调度过大并提出改进意见。并对改进后的系统,根据实测数据做出系统真实的管网阻力特性曲线,以及单台水泵和3台水泵并联的运行特性曲线,最后得到了水泵运行工作点。经最后调试,使系统的水力平衡和热力平衡满足了计量供热的要求。     

New Approach to Obtain Neutral Ester of Phosphoric Acid: Tris(2-chloroisopropyl) Phosphate

A new method to obtain neutral ester of phosphoric acid: tris(2-chloroisopropyl) phosphate is introduced. An air–ozone mixture is used as an oxidant. The efficiency of this method to obtain tris(2-chloroisopropyl) phosphate is experimentally proved. The parameters of the required equipment and the regime of the technological process are estimated to industrially fulfill the process. The performed studies form the base for the realization of resource-saving, energy-conscious and low-waste technology for the industrial production of tris(2-chloroisopropyl) phosphate.

     

对于我省推行项目管理新模式——代建制的几点思考

本文对代建制概念和意义作了深入具体的分析;阐述了代建制与我省现有建设制度的区别与利弊,提出实现工程各阶段管理目标的方法,总结了我省实行代建制现况的经验得失并提出相应建议和思考。     

供热锅炉的节能运行与经济效益

本文通过对典型事例的分析计算,总结了锅炉房节能运行的方法。提出了在采暖系统设计中科学计算以及锅炉房运行中科学管理是节省初投资和节约能源消耗的必然途径。     

数学形态学多结构元素的道路提取

提出了一种从遥感图像中提取道路的有效算法。该算法在数学形态学的基础上,针对图像中噪声和边缘形态的不同选择不同的结构元素进行道路边缘提取。实验表明,该算法具有良好的道路提取能力。     

Up-scaled Teer-UDP850/4 Unbalanced Magnetron Deposition System Used for Mass-Production of CrTiAIN Hard Coatings

CrTiAIN hard coatings[1]have been developed withdesired properties of high hardness,high toughness,high thermal stability(oxidation resistance at hightemperature),good adherence to substrate,extremewear resistance and excellent cutting performance.Initially,the deposition of Teer-CrTiAIN coatingswas performed in small batch of a medium researchUDP450/4system.As the coatings have continuouslyincreased commercial interesting especially in cuttingand forming tools,the deposition is now up-sc…     

某混凝土柱施工偏移事故的处理

以某住宅楼钢筋混凝土柱施工偏移事故的处理为例,对钢筋混凝土结构特殊节点的施工、监理及时进行了总结,为今后类似工程施工监理提供经验和借鉴。     

用德拜极化电池模拟双电层电容器性能的测试技术研究

德拜极化电池作为一种双电层电容器模型的评估。其电路元件与发生在DLC内的化学反应有关，其参数值可通过DLC的交流阻抗测量并应用采用非线性最小二乘法定位技术的计算机程序加以处理来获得。研究了在不同直流偏置电平和制造过程中的电路元件值的差异，并将德拜极化电池在缓慢放电和脉冲负载中的性能与实际电路以及采用经典等效电路模拟的结果进行了对比。