溶剂萃取法制备碳酸盐的热力学讨论

向金属氯化物(Ⅰ)的水溶液中通入CO_2气体,以期制备相应的碳酸盐和酸式碳酸盐,在常温常压下,体系的△G>0,反应几乎是不可能的。向反应体系中加入有机溶剂(S),使生成的HCl即被萃取,可促进Ⅰ的继续转化。分析计算表明,S对HCl必须有很强的萃取能力,其K_萃须在10~5以上。研究了加入有机溶剂N_(235)前后,体系的热力学状态、函数及其变化。加入N_(235)后,K_萃值增大了5个数量级。考察了温度、时间和通气次数对系统热力学性质的影响。根据反应的耦合原理和热力学分析,提出萃取剂选择的原则。结合实验数据的估算说明:溶剂萃取法由Ⅰ和CO_2制备碳酸盐的工艺路线是可行的。     

基于预处理模糊Petri网与改进遗传算法的电网故障诊断方法

为了提升电网复杂故障时的态势感知能力,提出了基于预处理模糊Petri网与改进遗传算法的电网故障诊断方法.首先,基于层次化、动态建模的思想,在建立元件一般故障诊断模型的基础上,引入浮动库所、浮动弧、浮动变迁的概念来合理的体现主保护、断路器以及后备保护之间的逻辑关系,建立了元件复杂故障时的诊断模型;其次,挖掘故障信息源的特性进行预处理,依据故障类型动态建立相应Petri网诊断模型;再次,利用改进的遗传算法对模型中的参数进行了训练、优化;最后,探讨了该Petri网故障诊断模型的容错性、通用性.对算例系统仿真的结果表明:该方法突出了故障诊断过程的层次性、可理解性,提升了诊断模型的透明性、改善了诊断模型的易维护性,在电网复杂故障的情况下诊断结果仍具有较高的准确度,并呈现有较好的容错性.     

极近距离煤层采空区下扩切巷与支护方式

四台矿综采三队12#8733面为极近距离煤层采空区下内错布置工作面,层间距仅0.9～2.0 m,文章介绍了在该条件下综采设备稳装期间及采煤机扩切巷的工艺、工序及支护的措施,对类似条件下工程施工具有一定参考价值。     

双单摆振动示波装置

双、单摆振动示波装置是在“双、单摆,双弹簧振子振动示波”装置的基础上,经过5年来的教学实践,进一步研制成的一种新仪器.它只用“双、单摆振动示波”一套装置就可以将参考圆、振动的合成、李萨如图形、耦合振动等有关机械振动的现象无一遗漏地演示出来.不失为一套好的演示教学仪器.     

Fabrication of PEDOT/PSS-ZnO nanowire by self-assembly method under vacuum condition

Poly(3,4-ethylenedioxythiophene) (PEDOT) has at- tracted much attention due to its high conductivity, excel- lent environmental stability and chemical processabil- ity[1,2]. PEDOT/PSS dispersion is a water-soluble system using poly(styrene sulfonic acid) (PSS) as the doping counterion during polymerization. The inclusion of PSS results in better solubility and processability to the PE- DOT/PSS aqueous dispersion[3, 4]. Recently, synthesis of one-dimensional (1D) multifunc- tional co…     

钼钒砷三元杂多酸催化性能的研究

本文合成了四个钼钒砷三元杂多酸:Hx[AsVnMo12-noy]ZH2O=1-4,简记Vn。经元素分析,pH电位滴定,差热热重分析、红外等确定了结构组成。用程序升温还原(TPR)研完了它们分别与H2和CO反应的氧化催化性能,发现,随钒取代增多,活性降低。在微型反应器中,考查了V1和V3对叔丁醇生成甲基丙烯醛的催化作用,发现V1活性高于V3,选择性则是V3高于V1。即随钒取代增多,活性降低,选择性提高。     

A Multi-Agent Approach for Solving Traveling Salesman Problem

The traveling salesman problem （TSP） is a classical optimization problem and it is one of a class of NP- Problem. This paper presents a new method named multiagent approach based genetic algorithm and ant colony system to solve the TSP. Three kinds of agents with different function were designed in the multi-agent architecture proposed by this paper. The first kind of agent is ant colony optimization agent and its function is generating the new solution continuously. The second kind of agent is selection agent, crossover agent and mutation agent, their function is optimizing the current solutions group. The third kind of agent is fast local searching agent and its function is optimizing the best solution from the beginning of the trial. At the end of this paper, the experimental results have shown that the proposed hybrid ap proach has good performance with respect to the quality of solution and the speed of computation.     

Effect of addition of poly（ethylene glycol） on electrical conductivity of poly（3,4-ethylenedioxythiophene）-poly（styrenesulfonate） hybrid

By mixing various concentrations of poly (ethylene glycol), a series of poly(3,4-ethylenedioxythiophene)-poly(styeenesuffonate) composite thin films were prepared.The electrical conductivity of the PEDOT-PSS/PEG thin films was measured by the four-pcobe method. Experimental results showed that the inclusion of poly(ethylene glycol) influenced the electrical conductivity of PEDOT-PSS film significantly. With the increase of PEG concentrations, the electrical conductivity sharply increased to reach a maximum and then slowly decreased down. Furthermore, the PEG molecular weight and environment temperature also played important roles on the electrical conductivity of PEDOT-PSS/PEG thin films. A good linear relationship was found between in σDC and T^-1/2 within the entire temperature range detected.     

Coal mine blasting caps refused to burst cause analysis and prevention

在煤矿井下爆破过程中,受井下客观环境条件影响,经常出现雷管拒爆导致的个别丢炮或成组丢炮现象.为了有效地遏制丢炮现象,文章探讨了煤矿井下爆破中丢炮的主要影响因素,并给出相应的预防措施,对有效杜绝拒爆、漏炮有一定的借鉴意义.