山西煤炭资源整合后的企业文化建设问题分析

分析了资源整合后煤炭企业在经营思想与管理模式、价值理念、企业形象、人力资源管理方面的文化冲突,并有针对性地提出了“容、合、和、顺”的发展思路及解决对策.     

综采工作面可靠性分析

应用可靠性理论对综采工作面进行分析,进而找到影响可靠性的因素,提出改善系统可靠性的意见,从而达到提高矿井的产量,增加经济效益的目的。该文从人-机系统可靠性、环境系统可靠性、综采工艺系统可靠性、供电系统可靠性、支架-围岩系统可靠性等方面对综采工作面的可靠性分析做了综述。     

时滞和相关性观测条件下的红外目标状态估计方法

着重对红外跟踪系统目标状态估计过程中存在的观测量滞后和相关性问题进行研究。在目标跟踪过程中,脱靶量信号的滞后导致目标量测位置和真实值间是有误差的,进而通过状态估计得到的目标参数也是不准确的,另外观测量的相关性也降低了估计效果的准确性。对于以上问题,首先利用观测重组技术对时滞观测序列进行重组,将其转化为变结构无时滞观测系统,并在此基础上提出了一种时滞椭球集员估计算法(Delayed ellipsoidal set filter,DESF)。仿真实验结果表明,DESF算法可以有效克服观测序列相关性的影响,同时系统跟踪性能较不考虑观测延迟的情况也有显著提高。     

热处理对SiO2薄膜折射率和吸收特性的影响分析

采用离子束溅射技术,在熔融石英基底上制备了SiO2薄膜,并通过椭偏光谱法和表面热透镜技术研究了热处理对其光学特性的影响。热处理对离子束溅射SiO2薄膜折射率影响较大,随着热处理温度增加,SiO2薄膜折射率先减小后增大,当热处理温度为550 ℃时,折射率达到最小。经过热处理后,SiO2薄膜的弱吸收均得到了降低,在2 ppm(1 ppm=10-6)左右,当热处理温度为550 ℃时,获得的SiO2薄膜弱吸收最小仅为1.1 ppm。实验结果表明:采用合适的热处理温度,能大大改善离子束溅射SiO2薄膜的折射率和吸收特性。     

Carbon Nanotube‐Encapsulated Noble Metal Nanoparticle Hybrid as a Cathode Material for Li‐Oxygen Batteries

Although Li‐oxygen batteries offer extremely high theoretical specific energy, their practical application still faces critical challenges. One of the main obstacles is the high charge overpotential caused by sluggish kinetics of charge transfer that is closely related to the morphology of discharge products and their distribution on the cathode. Here, a series of noble metal nanoparticles (Pd, Pt, Ru and Au) are encapsulated inside end‐opened carbon nanotubes (CNTs) by wet impregnation followed by thermal annealing. The resultant cathode materials exhibit a dramatic reduction of charge overpotentials compared to their counterparts with nanoparticles supported on CNT surface. Notably, the charge overpotential can be as low as 0.3 V when CNT‐encapsulated Pd nanoparticles are used on the cathode. The cathode also shows good stability during discharge–charge cycling. Density functional theory (DFT) calculations reveal that encapsulation of “guest” noble metal nanoparticles in “host” CNTs is able to strengthen the electron density on CNT surfaces, and to avoid the regional enrichment of electron density caused by the direct exposure of nanoparticles on CNT surface. These unique properties ensure the uniform coverage of Li₂O₂ nanocrystals on CNT surfaces instead of localized distribution of Li₂O₂ aggregation, thus providing efficient charge transfer for the decomposition of Li₂O₂.     

Multiple layer design for mass data transmission against channel congestion in IoT

Internet of Things (IoT) is well studied from many aspects; however, data transmission in a large‐scale constructed IoT network is still an open topic. In this paper, the problems of channel congestion caused by mass data transmission are discussed respectively from different perspectives. Then, a multiple layer solution is proposed, pointing to each layer including data processing architecture, data dimension reduction, data abandon protocol, and spectrum sharing. In the architecture layer, a combined scheme with cloud computing and sea computing is introduced. Context awareness and granular computing is exploited to implement the data dimension reduction. And cognitive protocol is involved with type of service, which drops certain data to guarantee the entire network connectivity. Then, a principal–agent theory based two‐step game model is proposed with the consideration of cooperation and price coefficient, which affect the secondary user's choice and primary user's profit. Some incomplete information is assumed as random variables so that certainty equivalent is introduced in the model. A simple scenario shows how the data dimension reduction works and how simulations for data abandon protocol and spectrum sharing test the two parts, respectively. Copyright © 2012 John Wiley & Sons, Ltd.     

TD—LTE系统Reed—Muller译码的仿真及FPGA实现

主要基于FPGA实现TD—LTE系统中的Reed—Muller译码,包括Reed—Muller译码的介绍、方案的构成、FPGA实现流程、以及实现结果分析。并在Virtex-6芯片上,进行了仿真、综合、板级验证。实现结果表明,该Reed—Muller译码算法应用到TD—LTE射频一致性测试仪表中具有良好的高效性和可靠性。     

钙化焙烧法脱除二次铝灰中氮的试验研究

针对二次铝灰中氮化铝导致的铝及其化合物浸出效果不佳的问题,采用钙化焙烧法处理二次铝灰。重点研究配料比、焙烧温度、焙烧时间对二次铝灰脱氮率的影响。结果表明,钙化焙烧法可快速降低二次铝灰中氮化铝含量,可将二次铝灰中不利于浸出的氮化铝和氧化铝转变成易于浸出的12CaO·7Al2O3。最佳脱氮工艺参数条件:配料比为mCaO:m铝灰=0.4、焙烧温度900℃、焙烧时间300min,在此条件下二次铝灰的脱氮率为85.25%。研究结果可为钙化焙烧法提高二次铝灰中铝及其化合物的浸出率提供参考。     

“放管服”背景下加强油气监管的思考与建议

自然资源部在油气监管领域落实"放管服"改革,通过推行油气信息公示制度,使监管过程更加公开,油气矿业权人诚信自律程度加强,政府监管效能得以提高,但仍存在无法实现完全随机抽取检查人员、未完成法定最低勘查投入不足情况比较突出、内部管理信息共享不够等问题。油气监管面临诸多新形势和新要求,包括生态文明建设要求加强绿色勘查开采监管,油气上游放开带来监管主体更加多元,新实行的油气探采合一制度要求加强勘探开发过程监管,国家关于加强信用监管的要求。油气监管现状与新要求在监管制度、监管力量、监管成果使用、信息化支撑等方面还存在差距,为更好地适应新要求,持续加强油气勘查开采监督管理,提出完善油气监管制度体系顶层设计,加强油气探采合一制度下勘查开采过程和重要节点监管,培育油气监管专业机构并加大科技手段使用,推进信用监管和分类监管,构建联合监管和服务相结合的新模式等政策建议。     

井巷工程超出矿区范围问题及处置措施研究

井巷工程超出矿区范围问题影响矿产资源开发秩序和安全生产。问卷调查和实地调研表明,该问题具有一定普遍性,亟需出台统一的政策整体解决。该问题的形成既有自然资源主管部门没有井下监管队伍、矿区总体规划与矿业权设置工作各行其是、将空间利用事项与矿产资源管理事项不合理捆绑管理等体制层面的根源性原因,也有地表条件限制等客观原因、采矿权人依法开矿意识不强工作不严谨等主观原因,矿业权管理主要环节对井巷工程布设空间需求考虑不足等管理原因。解决该问题要实事求是,疏堵结合,宽严相济。要着眼当下,对存量问题,针对基本情形分类处置;要着眼预防,根据成因和难点,建立预防机制;要着眼长远,针对根源性问题,从流程上合理再造,从体制上彻底理顺。