基于长带状煤矿巷道的无线传感器网络LEACH路由协议的改进

在矿井中部署无线传感器网络可以提高通信的安全性。针对传统无线传感器网络路由协议应用在煤矿中存在的缺点,在深入分析LEACH协议应用在长带状煤矿巷道中不足的基础上,将LEACH协议进行了改进,优化了簇首选择与分簇算法,采用改进的最小跳数路由算法使簇首通过多跳方式与汇聚节点通信,减少了节点能量消耗,使其更加适合长带状煤矿巷道中的要求,经过仿真实验验证了新协议的性能优越性。     

基于串行现场总线协议的煤矿胶带运输监控系统设计及应用

提出了一种适用于煤矿胶带运输监控系统的串行现场总线通信协议。首先介绍了现场总线协议标准,并针对煤矿胶带运输系统的特点,对协议进行分析得出该协议应满足简洁性、可靠性、实时性等要求的结论。然后详细介绍了该协议体系结构设计,提高协议可靠性的机制、策略和协议有限状态机。该协议在煤矿胶带运输监控系统应用中取得了较好的效果,结果证明设计完全满足要求。     

一种基于Zigbee的适用于煤矿井下无线传感的路由协议研究

针对目前煤矿井下缺乏一种有效的基于Zigbee的无线传感路由协议的现状,在TinyOS Beaconing路由协议的基础上,借鉴AODV协议的设计思想,提出了一种应用于煤矿井下的改进型TinyOS Beaconing协议-TinyOS Beaconing for Mine,并结合煤矿井下无线传感网络的实际布局情况,对节点查询算法、局部节点能量调整算法和路由维护算法进行了详细设计,并在此基础上对该无线路由协议及其他协议进行了对比仿真测试,仿真测试的结果表明,改进后的路由协议具有协议结构简单、路由表小,能量消耗小,数据通信可靠性高,网络生存时间长等特点,适合在煤矿井下使用。     

远程连接协议在煤矿井下带式输送机综合保护装置中的应用

介绍一种基于PLC的煤矿井下带式输送机综合保护装置,该装置相互通讯采用远程连接协议,可以实现多条带式输送机的集中控制。详细介绍了远程连接协议的软硬件实现方法。该装置性能稳定可靠,通讯功能强大,已在多个煤矿投入运行。     

基于CANopen的煤矿压力在线监测系统

以煤矿井下液压支架压力在线监测系统为研究对象,介绍了监测系统的设计,包括系统的整体构成、节点的硬件设计以及CAN通信模块设计等。通过对CANopen协议结构和特点的分析,详细阐述了CANopen协议在压力在线监控系统中的实现过程,包括节点的数据定义、对象字典的建立、程序流程等。最后通过在煤矿现场应用的情况,验证了监测系统的设计合理、稳定、可靠。     

基于非均匀分簇的虚拟MIMO在煤矿巷道“热区”的研究

针对煤矿巷道的特殊地理环境,分析LEACH协议和多跳虚拟MIMO为何会形成"热区"问题,提出一种多跳非均匀分簇(MU-V-MIMO)算法,介绍基于此算法的模型传输过程及能耗分析;通过MATLAB仿真,运用MU-V-MIMO算法的虚拟MIMO在网络总能耗和传感器网络生命周期等性能优于LEACH协议,更适合应用于煤矿巷道。     

EtherNet/IP协议在煤矿大数据中的应用

介绍了工业控制领域的一种广泛使用的工业以太网EtherNet/IP协议,并将其标准和协议推广扩展到煤矿井下设备。通过建立标准的EtherNet/IP协议数据映射点表,实现了煤矿井下设备通讯标准的统一。最后对比分析国内外数据,提出一种通过EtherNet/IP智能网关将煤矿井下不同设备不同协议集成到Internet的方案,实现煤矿井下设备的数据采集、传输、监控、存储和共享,为数据库建立奠定基础。     

桥式转载机转弯装置研究与应用

介绍了在纳林庙煤矿2~#井煤矿生产过程中,通过改进桥式转载机输送带转弯装置,提高了煤矿生产效率,并且逐步向其他煤矿推广。     

无线传感器网络LEACH路由协议的改进

分布式无线传感器网络结合无线网络通信技术可实现煤矿采空区沉陷监测,而无线传感器网络的路由协议是研究重点,因此,基于无线传感器网络LEACH路由协议的设计思想,以增强网络通信能力,减少冗余数据传输为目标,针对已有的LEACH改进算法提出一种改进的分层路由协议算法。主要体现在被迫簇首的引入和根据连续时间内单位节点监测变量的数据相关性,减少冗余数据的传输量。对2种LEACH协议的改进算法的网络生存时间进行了对比仿真,证明该改进算法在延长网络生存期方面的有效性。     

煤矿井下变电所无人值守的安全管理

主要介绍了目前广泛应用在煤矿井下变电所无人值守的一种全新的监控系统,其在应用之后发挥出来巨大的作用,另外主要对煤矿井下变电所无人值守的安全管理展开了分析与研究。我国现在煤矿企业随着社会的不断进步和经济的快速发展得到了很大程度上的发展,与此同时对煤矿开采过程中的安全管理和监控工作提出了更高的要求。开展煤矿井下变电所无人值守的监测工作关系到整个煤矿开采工作的安全问题,因此工作人员必须对监控系统的应用案例进行学习然后对安全管理工作进行不断地改进和完善。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。