Surface Movement Regularity of Super-Wide Mining Face With Top-Coal Caving

No.4326 super-wide panel of Wangzhuang Coal Mine ( in which the fully-mechanized top-coal caving longwall mining method was used) was monitored for dynamic characteristic of surface movement. The dynamic surface movement in and after mining was predicted by using the Mining Subsidence Prediction System. The results indicate that after mining, the surface above the super-wide panel reaches a state of full subsidence, making the No.309 national highway above the panel be located on the flat bottom of the subsidence basin so that the influence of mining activity in both sides of 4326 panel on the national highway is the smallest.     

Microstructure and magnetic properties of granularFePt/(FePt)_(27)Ti_(73) films for ultrahigh-density recording media

1　INTRODUCTIONThe increasing demand for the areal density inmagnetic recording has driven the recording bit tosmaller dimensions, and it is necessary to decreasegrain size to 8 nm to achieve the areal density of155 Gb/cm2. However, with such small grainsize, the grain magnetization becomes thermallyunstable because of superparamagnetic limitation.In order to overcome the thermal instability, highanisotropy is most necessary because high magne tocrystalline anisotropy …     

欧洲一体化进程对当代欧美关系的影响

近年来欧美关系的变化成为国际政治领域最值得关注的问题之一。欧美关系的新变化将深刻影响未来国际格局的形成。欧洲一体化是集经济一体化、政治一体化、社会规范化、文化均质化于一身的综合性进程，随着一体化的深入发展与冷战的结束，欧盟已成为欧洲地区重要的政治力量，欧美关系也逐渐发生变化。自身力量的增强使得欧盟谋求更大的政治影响，试图建立与美国的平等地位。目前，欧洲正日益成为一种平衡美国单极霸权的力量。欧美关系成为影响世界格局的重要变量。     

Effect of Heat-treatment Temperature on HA-coated Titanium Materials

1Introduction Currently,Titaniumalloyiswidelyusedassubsti tutefordamagedteethandboneduetoitssuperiorme chanicalpropertiesandbiocompatibilitybutitisnotbio activeanditselasticmoduluscouldnotmatchtothatof naturalbone(theelasticmodulusoftitaniumis110GPa andth…     

Low pressure synthesis of boron nitride with(C2H5)2O·BF3 and Li3N precursor

Cubic boron nitride(c-BN) was synthesized through benzene thermal method at a lower temperature of 300 ℃ by selecting liquid(C2H5)2O·BF3 and Li3N as reactants. Hexagonal boron nitride(h-BN) and orthorhombic boron nitride(o-BN) were also obtained. The samples were characterized by X-ray powder diffractometry and Fourier transformation infrared spectroscopy. The results show that all the BF3, BCl3 and BBr3 in the same family compounds can react with Li3N to synthesize BN since the strongest bond of B-F can be broken. Compared with BBr3, liquid (C2H5)2O·BF3 is cheaper, less toxic and more convenient to operate. Li3N not only provides nitrogen source but also has catalytic effect on accelerating the formation of c-BN at low temperature and pressure.     

人力资源管理中人才甄选的灰色多层次评价

把灰色系统理论和层次分析法，运用到人才甄别活动中，为人才甄别提供了一种计算简单、评价精度高的模型。     

La1-xCaxMnO3纳米单晶丝的制备及磁热效应研究

采用化学共沉淀法和热处理的方法制备了La1-xCaxMnO3(x=0.3,0.4,0.5)系钙钛矿型氧化物(LCMO),经XRD确定样品为钙钛矿型结构。TEM分析表明样品直径约为40nm的枝节状纳米丝,用△Tad-T测量仪测量了△Tad-T。与块状样品相比居里温度的波峰变宽,绝热磁温变降低。     

中国铝板带箔加工设备现状及发展方向

本文对中国铝板、带、箔材的主要生产设备概况作了全面的介绍，并对其发展趋势作了展望。截止到2004年底，中国铝板带箔主要生产设备台数及其生产能力(包括预计投产项目)如下：半连续铸造机26台，生产能力850kt／a；双辊式铸轧机170台(其中引进13台)，生产能力1400kt／a；带坯热轧机18台，生产能力1080kt／a；块片式二辊热轧机125台，生产能力650kt／a；现代化四辊与六辊冷轧机108台(含可轧单零箔的带／箔轧机)，生产能力2100kt／a；二辊冷轧机300台，生产能力450kt／a；可轧单零箔的冷轧机46台，箔材生产能力230kt／a；四辊铝箔轧机62台，生产能力240kt／a；二辊铝箔轧机112台，生产能力80kt／a；在建的热轧生产线11条，生产能力2670kt／a。2010年中国的铝箔产量预计将达到850kt／a，从而超过美国的产量位居世界首位；同期，中国轧制产品(FRP)产量将达到5500kt，稍高于美国。     

碳化法生产拟薄水铝石工业实践

介绍我厂拟薄水铝石的生产实践和工艺技术改造。     

船舶冷库单片机变频控制节能装置

根据世界能源现状,针对制冷循环的特点和船舶冷库制冷环境的特殊性,本文设计了一套通过单片机实现变频式能量调节的节能装置,并通过实验证明了将其应用于实际生产中的可行性.