基于捷联惯性导航的井下机车精确定位系统

针对目前矿井电机车运输信、集、闭系统仍存在逻辑功能不够完善,不能准确反映电机车的运行速度和行车方向数据通讯可靠性差以及系统不具备语音通讯功能等问题,采用捷联惯性导航技术引入到机车定位系统中,能更多提供导航和制导信息,提高其容错能力。该机车定位系统通过在义煤集团某矿的试验,证明了实用性,也便于机车管理。     

液压胀管的原理及应用

液压胀管是近二十年国外发展的新方法,经过研究实践,我们对液压胀管有了初步的认识,液压胀管比传统的机械胀管有很大的优越性,有推广的价值。     

Web service composition algorithm based on TOPSIS

Independent quality of service(QoS)registration center is difficult to monitor QoS with lots of requests in Internet environment with a large number of services and lots of service requests.It is able to reduce the load and decrease the failure rate by using multiple QoS registration centers to monitor QoS of some services with lots of requests.In addition,the heterogeneous QoS data close to user’s habitual expression and adapts to the environment with complexity and uncertainty.This paper introduces a novel Web service composition algorithm based on technique for order preference by similarity to an ideal solution(TOPSIS)(WSCA_TOPSIS)to solve the above difficulties for the first time.WSCA_TOPSIS can support multiple decision-makers and heterogeneous QoS data.It includes three main steps:normalizing decision matrix,evaluating alternatives synthetically and evaluating group alternatives synthetically.Other contributions of the paper include a novel algorithm of aggregating QoS and a set of experiments that demonstrate the benefits and effectiveness of our approach.Experimental results show that the proposed algorithm can better support Web service composition with heterogeneous QoS data and multiple decision-makers.     

Experimental Analysis on the Variable Polarity Plasma Arc Pressure

Arc pressure is one of the key factors for variable polarity plasma arc(VPPA) and welding pool formation. In this paper, VPPA pressure is measured by pressure transducer and U-tube barometer methods, and advantages and disadvantages of the two methods are compared. The effects of welding parameters, including with straight polarity(SP) current, reverse polarity(RP) current, time ratio of SP to RP, plasma gas flow rate, on VPPA pressure are investigated by using an orthogonal design. The experimental results indicate that the influencing degree of the welding parameters are in the order of plasma gas flow rate, SP current, time ratio of SP to RP, RP current. These results are important to researches of VPPA welding process and its mechanism. The physics behavior of VPPA is taken into account when the above influence mechanisms are analyzed. Firstly, according to the mechanism of the cooling compression to the arc, the compression to VPPA is enhanced with the increase of plasma gas flow, so the VPPA pressure would increase obviously. Secondly, although the temperature of VPPA is as a function of the welding current, the radius of VPPA is also enhanced. So the effects of SP current on VPPA pressure are inferior to the effects of plasma gas flow. Thirdly, VPPA pressure increases as a function of time ratio of SP to RP because the frequency of welding current influences the arc pressure to the some degree; Finally, the RP intervals are farther less than the SP intervals, so the influence to the pressure is minimal.     

无汞碱性Zn／MnO2电池锌粉生产工艺研究

叙述了一种无汞碱性Zn／MnO2电池合金锌粉工业化的制备工艺。该工艺主要包括合金元素预合金化、中频感应熔炼、雾化制粉、脱水干燥筛分和物理气相沉积(PVD)。用该工艺制备的产品其性能指标达到国外同类产品水平。     

Fatigue Property of Nano-grained Delaminated Low-carbon Steel Sheet

Tension-tension fatigue life tests on nano-grained delaminated low-carbon steel sheet under different fatigue loads are carried out to study the fatigue properties of the steel.The three-dimensional microstructures of the steel are observed by TEM.In addition,the morphology of the fatigue fracture of the specimen under different loads is observed by SEM.The results show that micro-cracks form on the weak interface of the nano-grained steel under low-stress conditions,which hinders the propagation of the main cracks and reduces the fatigue crack propagation rate,resulting in the extending fatigue life of the steel.     

汽油罐铝合金浮筒失效分析

新建汽油罐在水压实验后铝合金浮筒表面出现严重腐 蚀和穿孔，为了弄清浮筒腐蚀原因，利用宏观检验方法和微观检验方法，从多方面对浮筒失效原因进行了综合分析和研究.结果表明：浮筒产生腐蚀与穿孔主要是由于浮筒铝合金材料在水溶液中产生晶间腐蚀引起的.     

变换炉的制造与检验

本文介绍某公司50万吨/年甲醇项目关键设备变换炉炉体的主要设计参数及结构、制造,综合论述了该设备的主要制造工艺和试验要点,并对该设备的制造难点及解决方法作了详细的阐述。     

预加氢反应器的制造和检验

介绍了预加氢反应器的典型结构,分析了制造难点,有针对性地提出了解决难点的特殊工艺方案。其积累的制造经验,对类似设备的制造有一定的参考价值。     

冀东中生代凹陷与辽西中生代凹陷在地质上的差异

冀东、辽西是“燕山运动”的发祥地,两区同处于燕辽沉降带中,在地质上是可类比的,但在中生代火山岩凹陷区的形态、构造、地层等诸方面都存差异。差异的分界是凌源一杨杖子断裂。这些差异对矿产资源的寻找和地质单元的划分都有影响。