基于ZigBee和LabVIEW的矿井瓦斯监测系统设计

针对传统煤矿瓦斯监控系统的不足,提出了一种采用ZigBee无线传感器网络与虚拟仪器技术相结合的煤矿瓦斯监测方案,采用ZigBee无线通信技术构建无线传感器网络,利用LabVIEW 2009作为开发环境,设计出上位机监测系统软件。通过实验验证,该系统具有可行性、良好的稳定性、低功耗、易于维护等特点。     

基于ZigBee与谓词Petri网的煤矿安全预警系统设计

针对我国煤矿安全监测系统建设成本较高、有线布线困难、许多煤矿生产区安全设备落后的问题，设计了一套基于ZigBee与谓词Petri网的煤矿安全预警系统。该系统搭建ZigBee无线网络对煤矿井下各种环境参数进行实时监测，通过通信模块上传至云平台记录、储存、处理数据；并结合谓词Petri网构建煤矿安全预警报警模型，提高了报警准确性，有效保障了井下作业人员的安全。     

基于无线传感网络的煤矿井温湿度监控系统设计

针对ZigBee的技术特点和煤矿开采区域对空气参数的要求,将基于ZigBee的无线传感网络技术应用于煤矿企业矿井环境监控领域,提出一种智能化、精确化的矿井环境温湿度监控系统设计方案。该系统以CC2530芯片为核心设计了无线传感网络的硬件平台,结合ZigBee协议栈和模糊PID控制算法设计系统软件流程,实现对目标监测区内的温度和湿度等矿井环境信息进行快速、可靠的远程采集和传输,并进行精确控制。     

ZigBee无线传感器网络在瓦斯监测系统中的应用

基于ZigBee技术的低成本、低功耗、可以自动组网等特点,提出了一种基于ZigBee的煤矿瓦斯监测系统设计方案,阐述了系统的软、硬件设计思想和实现方法。     

基于ZigBee通信的煤矿机车定位与状态监测研究

开发了基于ZigBee通信的井下机车定位和监测系统,有效解决了煤矿作业定位精度低、通信质量不高等问题。通过在巷道和机车布置ZigBee节点,根据参考节点和盲节点定位机车位置,利用ZigBee无线收发控制,实现井下机车的远程监控。     

锦界煤矿中ZigBee人员定位系统的研究与应用

井下人员定位系统是保障井下人员生命安全的重要系统,系统具有对井下人员实时定位,监测井下的工作环境等功能,对锦界煤矿ZigBee人员定位系统进行分析,详细介绍了其采用的ZigBee无线通信技术,着重讨论了基于信号飞行时间的测距算法,并对整套系统的设计原理及拓扑结构进行论述。     

基于ZigBee的煤矿高压开关柜无线监测系统设计

针对煤矿井下的工作环境,设计了一种基于ZigBee的煤矿高压开关柜无线监测系统,文章介绍了系统的整体结构、硬件和软件设计。系统通过无线通信的方式,将各个高压开关柜的温度信号传输到CPU进行分析、处理和存储,通过串口通信方式传输给上位机,以便于提醒工作人员。系统不仅实现了对高压开关柜工作状态的实时监测,还可对故障的发生起到预警作用。     

基于CAN总线与ZigBee的瓦斯实时监测及预警系统设计

针对当前瓦斯实时监测工作存在的被动局面,结合当前的无线传输技术,提出一种基于CAN+ZigBee的瓦斯实时监测系统。系统中,以ZigBee+CC2530作为采集节点,完成巷道内空气湿度、风速、瓦斯浓度等的采集,并通过ZigBee路由节点将数据传输给后台监控主机。最后通过多源信息融合技术和GA-SVM完成对瓦斯浓度的预测。以某煤矿巷道作为研究对象,对其瓦斯浓度的实际值与测量值进行对比,得到其两者变化趋势大致吻合,验证了方案的可行性。     

基于无线传感器网络技术在煤矿安全系统中应用研究

文章主要讲述了在煤矿安全领域的监测系统中运用GPRS无线通讯网络和ZigBee形成以数据通讯网络为基础的无线传感器网络(WSN)的设计、体系结构原理、和煤矿中安全监测系统方面的利用。     

基于物联网的煤矿井下机车进站预报系统设计

针对目前煤矿井下机车报站系统存在数字化程度低、主要依赖人员现场操作、布线复杂等缺点,采用ZigBee技术,设计了煤矿井下机车进站预报系统,准确监测井下机车运行状态参数,通过信号站防爆显示屏及时了解机车位置及到站时间,为煤矿运输安全管理提供强有力的技术保障。     

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     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

2014 second batch of rare earth quota released

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