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地下矿山采场顶板厚度数值模拟研究艾显恒1,谢建兵2,3,朱和玲31. 云南驰宏锌锗股份有限公司2. 金诚信矿业建设集团有限公司3. 中南大学摘 要:通过结构力学解析法对顶板沉降量的计算,估算出能维持顶板稳定的厚度取值范围,运用FLAC3D软件建立了开采环境再造采场数值模型,并对不同厚度顶板进行模拟计算,揭示了顶板厚度对采场稳定性,应力分布以及顶板沉降量的影响规律,表明了塑性区,应力扰动范围以及沉降量都随着顶板厚度的增加而减小,且减小的幅度趋缓.以顶板沉降量为判据,模拟结果得出,顶板厚度是6m时的最大沉降量为......
地下矿山采场顶板厚度数值模拟研究艾显恒1,谢建兵2,3,朱和玲31. 云南驰宏锌锗股份有限公司2. 金诚信矿业建设集团有限公司3. 中南大学摘 要:首先用结构力学解析法计算对顶板沉降量,估算出能维持顶板稳定的厚度取值范围;然后运用FLAC3D软件建立了开采环境再造采场数值模型,并对不同厚度顶板进行模拟计算,揭示了顶板厚度对采场稳定性,应力分布以及顶板沉降量的影响规律.模拟结果得出,顶板厚度是6 m时的最大沉降量为6.376 cm,可满足矿山安全要求;同时,兼顾顶板施工工艺,构筑成本,得出顶板的最小安全厚度宜......
with -?N-NH as SC is the lowest. Key words: heterocycle; ferromagnetic coupling unit; biradical molecule 1 Introduction The design and the synthesis of organic molecules with very high-spin ground states... into two components: a spin-containing (SC) fragment which provides the unpaired electron and a ferromagnetic coupling (FC) unit which is connected with radical centers ferromagnetically.  ......
Coupling leaching of sphalerite concentrate PENG Peng(彭 鹏)1, 2, XIE Hui-qin(谢惠琴)1, LU Li-zhu(卢立柱)1 (1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China; 2. Engineering Command Institute of Chemical Defence, Beijing 102205, China) Abstract: Coupling process of sphalerite concentrate leaching in H2SO4-HNO3 and tetrachloroethylene extracting of sulfur......
Theoretical and experimental investigation on giant magnetoresistive materials with amorphous ferromagnetic layer WEN Qi-ye(文岐业), ZHANG Huai-wu(张怀武), SONG Yuan-qiang(宋远强), JIANG Xiang-dong(蒋向东... semiclassical model was extended for amorphous layer based magnetic sandwiches by considering that the mixed layers exist between the ferromagnetic and nonmagnetic layer. The calculated results agree......
of ferromagnetic metal fine fibers by organic gel-thermal reduction process CAO Kai(曹 凯), SHEN Xiang-qian(沈湘黔), JING Mao-xiang(景茂祥), ZHOU Jian-xin(周建新) (School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China) Abstract: The organic gel-thermal reduction process was used for the preparation of ferromagnetic metal Ni, Co and Fe fine fibers from the raw materials......
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and In sites is suggested to prefer the ferromagnetic coupling. In contrast to the case of Ni2Mn1+ySn1-y (y=0.25), when substitution of Co for Ni with x=0.25, the P state of Ni2-xCoxMn1+ySn1-y (x... interaction from anti-ferromagnetism to ferromagnetism. Total energy difference between paramagnetic and ferromagnetic austenite plays an important role in magnetic transition of Ni-Co-Mn-Sn......
Size and shape effects on Curie temperature of ferromagnetic nanoparticles CAO Ling-fei(曹玲飞)1, XIE Dan(谢 丹)2, GUO Ming-xing(郭明星)3, H.S. Park1, T. Fujita1 1. School of Engineering, University...; Abstract: A simplified model was developed to describe the Curie temperature suppression of ferromagnetic nanoparticles. Based......
and ferromagnetic in Mn-doped anatase TiO2 nanowires LI Hong-mei(李红梅)1, 2, LIU Min(刘敏)1, 2, ZENG Yang-su(曾阳素)1, 2, HUANG Tong-cheng(黄同成)1, 2 1. Department of Information Engineering, Shaoyang University... that the samples are composed of Ti, Mn and O. According to magnetization measurements, all samples show ferromagnetic behavior, but only the undoped TiO2 NWs are completely ferromagnetic......