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完成了19F+27Al深部非弹性碰撞产物的角分布测量.初步分析了反应产B,C,N,O,F,Ne,Na,Mg和Al的实验室系角分布,展现出深部非弹性反应机制的特点,显示了反应系统随时间的演化过程. Angular distributions of fragments produced in the deep inelastic collision of~(19)F+~(27)Al have been measured for incident energy of 114 MeV at θ_(lab)= 9~(o), 24~(o), 40~(o), 55~(o), 70~(o) and 85~(o). Angular distributions of dissipative products B, C, N, O, F, Ne, Na, Mg and Al are analyzed to provide an evolution process of the intermediate dinuclear system formed in the reaction. 相似文献
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大埋深粘土三轴高压卸载变形与强度特征 总被引:1,自引:0,他引:1
以取自山东巨野矿区埋深近 4 30~ 6 0 0m的深部粘土样为例 ,分析测试了土的常规物理力学性质参数。考虑该埋深土的天然应力水平及其在煤矿建井开挖中的卸载应力变化 ,在三轴伺服仪上 ,进行三向等压分别达 11MPa、12MPa、14MPa下的卸除围压、保持轴压的三轴高压卸载试验 ,分析了深部粘土三轴高压卸载变形和强度特点 ,得到了相关力学参数。成果丰富了土的高压卸载力学性研究 ,并为巨野矿区煤矿立井建设提供了工程地质基础参数 相似文献
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乔正明 《数学的实践与认识》2017,(5):284-288
巷道围岩变形是煤矿开采普遍存在的问题,巷道开挖过程中围岩会出现破裂现象.主要探讨模糊灰色系统的深部巷道围岩变形预测模型及应用,通过分析模糊数学理论、灰色理论,给出模糊灰色系统预测新陈代谢模型. 相似文献
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In this paper we investigate the influence of microstructure on the CH4 adsorption behavior of deep coal. The coal microstructure is characterized by N2 adsorption at 77 K, scanning electron microscopy (SEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FT-IR). The CH4 adsorptions are measured at 298 K at pressures up to 5.0 MPa by the the volumetric method and fitted by the Langmuir model. The results show that the Langmuir model fits well with the experimental data, and there is a positive correlation with surface area, pore volume, ID/IG, and CH4 adsorption capacity. The burial depth also affects the methane adsorption capacity of the samples. 相似文献
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Zahra Ahmadi Ganjeh S. Farhad Masoudi 《中国物理C(英文版)》2014,(10):131-136
Neutron beam optimization for accelerator-based Boron Neutron Capture Therapy(BNCT) is investigated using a ^7Li(p,n)^7Be reaction. Design and optimization have been carried out for the target, cooling system,moderator, filter, reflector, and collimator to achieve a high flux of epithermal neutron and satisfy the IAEA criteria.Also, the performance of the designed beam in tissue is assessed by using a simulated Snyder head phantom. The results show that the optimization of the collimator and reflector is critical to finding the best neutron beam based on the ^7Li(p,n)^7Be reaction. Our designed beam has 2.49×109n/cm^2 s epithermal neutron flux and is suitable for BNCT of deep-seated brain tumors. 相似文献
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采用MTS815岩石材料力学试验机,在温度28℃条件下,对重庆市万盛区某煤矿深部掘进巷道灰岩进行了三轴蠕变试验,对不同偏应力水平下该巷道灰岩的蠕变特性进行了分析。结果表明,蠕变试验的曲线显示该灰岩蠕变具有非线性特征,其蠕变特性随着围压的增加而更加明显。对深部灰岩的蠕变模型进行初步探讨,回归得出深部灰岩在不同应力水平下蠕变应变随时间变化的Burgers蠕变方程。分析表明,Burgers模型能较好地反映该深部灰岩的蠕变规律。该模型所确定的本构关系可以作为该深部灰岩蠕变本构模型来预测其蠕变发展。 相似文献
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本文用三维有限单元法模拟计算了深部闭锁断层周围的应力场、形变场,分析了它们的时空变化特征。认为:活断层周围的水平应力在断层附近略有减小;由断层闭锁引起的应力增强区和相对减弱区在其两侧反对称分布,闭锁区周围较大范围内应力增强,比断层端部更能积累巨大的弹性应变能而孕育较强地震;地壳应力、形变的逆向变化可能与震源孕育过程的不同阶段相联系。 相似文献