试论李白诗中"玉"的文化意蕴

玉文化是中国传统文化的一部分.李白爱玉,并常写玉.在李白诗中,玉是权力、地位的象征,是德行、信义、才华的象征.是幸福祥瑞的象征,是美好事物的代名词.写玉,为李白诗歌增添了独特的魅力.     

浅谈继电保护装置自动测试系统的研究和设计

继电保护已涉及到电力系统的各主要环节.发电、输电、变电、配电、小到设备的元件保护、达到设备以及输电线路保护.电力系统自动化程度的不断发展和提高,给继电保护提出更加严峻的目标和要求.继电保护是电力系统自动化的重要组成部分,是电力系统三防中重要防线之一,是保证系统安全、可靠稳定运行的坚强后盾.微机化、网络化、智能化.测量、保护、通讯、控制一体化是继电保护未来发展的主要方向和目标.     

薄板自动上料机的设计

薄板自动上料机是薄板壳体部件成型加工的首道工序.是一种用途广泛的设备.目前,我国有很我各种壳板部件生产线,大多数是近年来进口的,各种生产线的上料机构的结构形式也很多.这里介绍的是一种结构紧凑、造价低、效率高、简捷实用的上料机.该机在处理吸料、提升、送进及检测重板等方面都有独到之处.可以为有关设计人员作参考.以便为我国能自主设计、制造有关的自动化生产线提供一点借鉴.     

论人大个案监督--以司法[1]的性质为视角

人大是否有权或应当对法院进行个案监督,是一个争议较大的问题.司法是一种由第三方独立地、中立地裁判争议的行为.独立、中立、被动是司法的特性.从本质上讲,司法是判断,是一种认识.它必须是由经过严格法律专业训练的人,按严格的法律程序才能进行的一种工作.因此,从司法的性质讲,权力机关不应当对法院进行个案监督,而应当在宪法和法律的范围内,立足宇宏观的、一般的、事后的监督.     

大学文化的载体和构成

文化是观念形态,它是不能独立存在的,而必须以某种感性存在物为自身的承担者,这种感性存在物就是文化载体.文化研究的任务就是要揭示文化附着于各种载体中的观念内容.文字和语言、器物和硬技术、组织设施、人及其活动等,是文化的四种主要载体.这些载体,既是一般文化的载体,同时也是大学文化的载体.一切文化都是观念内容与感性载体的统一.就大学文化的观念内容来看,大学文化的主要构成要素有:大学精神、大学理念、大学制度和大学品格.     

也谈干部作风建设

作风是一个永恒的话题,是一个常抓常新的灵魂工程.不同时期、不同环境、不同人群,不同形势下,干部作风表现形式是有差异的.优良作风感染人,不良作风传染人.因此,干部作风建设要与时俱进,常抓不懈.     

扎实推进基层建设促进企业协调发展

基层是生产、经营、科研的基本单元,是企业全部工作和竞争力的基础.要建设一支领导班子坚强,支部作用突出、员工素质优良、管理科学规范的铁队伍,就必须有一个高素质的领导班子.提高员工素质是基层建设的根本.开展“安全环保基础年”活动,着力提高基层基础管理工作.坚持以人为本,培育和谐发展的基层文化.     

关于军事工程院校实施素质教育的思考

本文以素质教育为出发点,全面论述了军事工程院校人才培养模式.提出了军事工程院校学员的素质包括政治素质、工程素质、军事素质、人文素质、身心素质.在这些素质中政治素质是灵魂,工程素质是主体,军事素质、人文素质、身心素质是基础.军事工程院校要全面发展素质教育,创造素质教育的环境.     

论人生的纯朴

人生是真善美的统一.单就美来说,是真与善的统一.这种统一是精神与践行统一的人生状态,其本质是纯朴的资质.而要实现人生的纯朴,就要正确对待“真诚与面具”、“骄傲与谦虚”、“外表与内心”等方面的关系,把握好心、行、身三者综合而内外充实的人格美.     

试论旋转机械振动故障诊断技术

旋转机械是指主要功能是由旋转运动完成的机械.如离心式风机、电动机、汽轮机等.旋转机械发生故障的明显特征是机器运行中有异常的振动和噪声,其振动信号从幅域、频域和时域反映了机器的故障信息.旋转机械振动诊断是故障诊断技术中非常重要的一个方面.因此,加强对旋转机械振动故障的诊断是节省维修费用,提高企业经济效益的重要手段.     

Fractal analysis of thermal conduction of loose coal

For deep mining engineering,heat transfer of coal mass is a vital factor in the thermal environment of coal mines.In order to study the thermal conduction mechanism,we obtained gray images of coal mass microstructure by scanning samples with a digital microscope.With the use of Matlab,these gray images were transformed into binary images,which were then transformed into a corresponding matrix consisting only of the values 0 and 1.According to the calculation method of box-counting dimension,we calculated the fractal dimension of the loose coal to be approximately 1.86.The thermal conductivity expressions of loose coal were derived based on the simulation method of thermal resistance.We calculated the thermal conductivity of loose coal by using a fractal model and compared the calculated values with our experimental data.The results show that the test data show an encouraging agreement with the calculated values.Hence fractal theory is a feasible method for studying thermal conductivity of loose coal.     

煤巷高冒区松散煤体自然发火的数值模拟研究

巷道高冒区自燃火灾，不仅严重影响到采掘工作面的安全生产，而且威胁到矿工们的生命安全．通过对煤巷高冒区特点和影响煤炭自燃因素的分析，根据多孔介质流体动力学、传热和传质理论，建立了高冒区松散煤体自然发火过程三维数学模型．以旗山煤矿高冒区为例，用有限元法进行了数值求解，得到高冒区渗流速度场、温度场和氧浓度场的分布，在此基础上划分出最易自然发火的区域，分析了高冒区自然发火的机理．结果表明：高冒区松散煤体漏风强度随孔隙率的增大而增加；高冒区松散煤体的中部区域存在最易自然发火区，是现场防治高冒区自然发火的重点区域．现场试验数据验证了数值模拟结果的合理性．     

极松散细砂岩顶板下放煤工艺散体试验研究

为了优化不同煤矸块度条件下的放煤工艺参数，在实测分析顶煤破断块度分布特点的基础上，采用散体模型试验的方法对煤层顶板为极松散细砂岩条件下的放煤工艺进行了研究。分析了不同放煤步距、顶煤块度对放煤过程中煤矸砂流动形态、混矸程度的影响．给出了不同煤矸块度每件下的放煤步距选取原则．研究表明，加大放煤步距，顶煤运移流动的范围变大，流动断面内速度梯度变小，有利于控制细砂的下窜速度．试验结果表明，放煤步距采用三采一放有利于控制顶板极松散细砂岩，降低放出顶煤的合砂率．     

Damage statistical mechanics model of top coal in steep top caving coal

Damage statistical mechanics model of horizontal section height in the top caving was constructed in the paper. The influence factors including supporting pressure, dip angle and characteristic of coal on horizontal section height were analyzed as well. By terms of the practice project analysis, the horizontal section height increases with the increase of dip angle β and thickness of coal seam M. Dip angle of coal seam β has tremendous impact on horizontal section height, while thickness of coal seam M has slight impact. When thickness of coal seam is below 10m, horizontal section height increases sharply. While thickness exceeds 15m, it is not major factor influencing on horizontal section height any long.     

低透气性煤层松动爆破增透机理数值模拟研究

运用RFPA2D—Flow固气耦合系统模拟了松动爆破抽放低透气性煤层内瓦斯的过程,解释了爆破松动是增加低透气性煤层透气性的有效途径,本文对松动爆破前后抽放过程中煤层内瓦斯压力和瓦斯渗流场的变化规律进行了数值模拟对比,为进一步理解瓦斯抽放、松动爆破增透机理等提供理论基础和科学依据。     

Estimation of Loose Status of Jigging Bed Based on Adaptive Neuro-Fuzzy Inference System

In the separation process with a jig washer, an accurate on-line measurement of loose status of a jigging bed is essential for a successful control of coal quality and loose status is difficult to measure on-line directly in industrial process situations. So a soft-sensor technology is needed for this purpose. The soft-sensor model is developed in the experiment by an adaptive neuro-fuzzy inference system （ANFIS） which has a remarkable ability of learning and generalization. Based on the analysis of the technologic mechanism of jigging bed, the structure of the ANFIS is established to build the soft-sensor model of loose status estimation. The ANFIS is trained by a hybrid learning algorithm. Finally, the simulation results and comparison analysis are presented, which indicate that the ANFIS has better abilities of learning and generalization than the RBF and the BP networks. Thus, it is possible that the loose status of the jigging bed can be estimated on-line bv using ANFIS.     

矿区煤矸石充填复垦的材料确定与标高设计

为科学确定煤矸石充填复垦的材料和标高，以徐州矿区为例，采用现场试验和实验室分析测定相结合的方法，研究了煤矸石的地球化学性能和有毒元素状况，分析了煤矸石孔隙度计算的理论和方法，建立了煤矸石充填超高计算的数学模型，提出了煤矸石充填标高确定的数学方法．结果表明：徐州矿区煤矸石可作为煤矿塌陷地的充填复垦材料，煤矸石地球化学组成中SiO2的质量分数平均为54．66％，使得煤矸石具有一定的硬度，煤矸石的Hg，Cd，Pb，As和F等有毒元素含量不超标；煤矸石充填复垦的实际充填高度应为设计充填高度的1．3649倍．     

Mechanical mechanism of overlying strata breaking and development of fractured zone during close-distance coal seam group mining

This study mainly investigates the mechanical mechanism of overlying strata breaking and the development of fractured zones during close-distance coal seam group mining in the Gaojialiang coal mine. First,a mechanical model for the second ‘‘activation" of broken overlying strata is established, and the related mechanical ‘‘activation" conditions are obtained. A recursive formula for calculating the separation distance of overlying strata is deduced. Second, a height determining method for predicting the height of fractured zones during close-distance coal seam group mining is proposed based on two values, namely,the separation distance and ultimate subsidence value of overlying strata. This method is applied to calculate the fractured zone heights in nos. 20107 and 20307 mining faces. The calculated results are almost equal to the field observation results. Third, a modified formula for calculating the height of a waterflowing fractured zone is proposed. A comparison of the calculated and observed results shows that the errors are small. The height determining method and modified formula not only build a theoretical foundation for water conservation mining at the Gaojialiang coal mine, but also provide a reference for estimating the height of water-flowing fractured zones in other coal mines with similar conditions.     

Oxidative heat release intensity in coal at low temperatures measured by the hot-wire method

Directly measuring the oxidative heat release intensity at low temperatures is difficult at present. We developed a new method based on heat conduction theory that directly measures heat release intensity of loose coal at low temperatures. Using this method, we calculated the oxidative heat release intensity of differently sized loose coals by comparing the temperature rise of the coal in nitrogen or an air environment. The results show that oxidation heat release intensity of Shenhua coal sized 0-15 mm is 0.001～0.03 W/m3 at 30～90℃ and increases with increasing temperature. The heat release intensity at a given temperature is larger for smaller sized coal. The temperature effect on heat release intensity is muted as the coal size increases. At lower temperature the change in heat release intensity as a function of size becomes smaller. These results show that the test system is usable for practical applications and is easy to operate and is capable of measuring mass samples.     

Optimization of transport passage with dragline system in thick overburden open pit mine

According to the characteristics of opencast coal resources and dragline technology system application in China, the structure and shifting step of transport passage are optimized in this paper. Typical coal transport passage is analyzed in aspects such as the internal dump occupation, dragline operation efficiency, coal transport distance, upper stripping distance and shifting quantities. The middle passage should be given priority in thick overburden open pit mine because the dragline system is only responsible for part stripping task. According to characteristics of middle passage, the transport passage is divided into parallel climbing, vertical climbing and horizontal transport. In addition, the transport passage structure optimization model and shifting distance optimization model are established in this paper. The case study in Heidaigou open pit mine shows that, the parallel climbing height is accounted for about 60% of the total height, and reasonable shifting distances of the first mining area and the second mining area are 240 and 320 m. Sensitivity analysis shows that, the total passage height has important influence on the shifting step, so it is with the stripping height and passage construction cost to the passage structure.