共查询到20条相似文献,搜索用时 15 毫秒
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CraigA. Wheeler AlanW. Roberts MarkG. Jones 《Particle & Particle Systems Characterization》2004,21(4):340-347
Belt conveyors are used extensively in the mining and mineral processing industries to transport bulk solid. As industry demands arise and conveying technology improves, belt conveyor installations are becoming progressively longer and belt speeds significantly faster. With longer conveying distances it becomes increasingly important to accurately calculate the motion resistances at the design stage, with the view of minimising these resistances to improve the efficiency of the installation. The motion resistances that occur along the length of the conveyor are known as the main resistances and include the belt and bulk solid flexure resistance, the rotational resistance of the idler rolls and the indentation rolling resistance of the conveyor belt. 相似文献
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Yoshio Hoei 《Journal of Macromolecular Science: Physics》2014,53(9):1497-1504
Literature stress-strain data of filler-unfilled networks, observed in uni and biaxial deformation modes, were comparatively characterized using Hoei's finite extensibility tube model and Meissner and Matějka's primary finite extensibility tube model excluding their empirical correction term for the finite extensibility. As a result of this analysis, the former model was found to be able to more advantageously describe the stress-strain behaviors over the entire range of strain without needing the empirical correction term. 相似文献
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从几何光学出发,推导了毛细管干涉仪的从柱面透镜到接收屏的光线的光程.对光线追迹模拟,结果表明毛细管干涉仪的干涉条纹的形成可用双光束的干涉来解释.从柱面不同位置入射的两条光线可能具有相同的光程,而且从柱面透镜不同位置出发的两条光线可能到达接收屏的同一点,当它们满足相干条件时,就会形成干涉条纹.建立了干涉条纹的计算机模拟程序, 模拟了毛细管中液体折射率、毛细管内径、外径对干涉条纹的影响. 结果表明实验中应使用薄壁毛细管, 由于干涉条纹对柱面透镜到毛细管之间的距离非常敏感, 为提高精度, 建议在实验中用已知折射率的标样来确定这一距离. 相似文献
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Rafael I. Nepomechie 《Journal of statistical physics》2003,111(5-6):1363-1376
There is an approach due to Bazhanov and Reshetikhin for solving integrable RSOS models which consists of solving the functional relations which result from the truncation of the fusion hierarchy. We demonstrate that this is also an effective means of solving integrable vertex models. Indeed, we use this method to recover the known Bethe Ansatz solutions of both the closed and open XXZ quantum spin chains with U(1) symmetry. Moreover, since this method does not rely on the existence of a pseudovacuum state, we also use this method to solve a special case of the open XXZ chain with nondiagonal boundary terms. 相似文献
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简述了脉冲管制冷机研究现状和存在的问题 ,介绍了低温中心建立的脉冲管制冷机动态参数实验系统。通过对一典型脉冲管制冷机的动态参数的实验数据测量 ,分析了动态压力和质量流量之间的振幅和相位关系 ,首次在实验中发现了存在于脉冲管制冷机内部的直流现象 (DC-Flow)。指出该直流分量是脉冲管制冷机的一种损失 ,揭示了多路旁通进气方式可减小直流损失 ,提高脉冲管制冷机的效率。并从理论上分析了产生直流现象的根本原因 ,给出了直流分量的具体数值和大小。 相似文献
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在75%和96%两个不同的稀释度下,测量了乙烯/氧气/氩气混合气的着火延迟时间,实验当量比为1,压力为1.3-3.0 atm,温度为1092-1743 K.实验结果表明,着火延迟时间的对数与温度倒数呈良好的线性关系,在两个稀释度下,着火延迟时间随着温度增加而减少.通过回归分析,得到了乙烯着火关联式.计算得乙烯着火延迟在96%稀释度时是75%稀释度的5倍.采用分子硬球碰撞模型,计算了不同稀释度下,乙烯与氧分子的碰撞次数,在96%稀释度下,乙烯与氧气分子碰撞次数为1.53×1029/(s·cm3),而在75%稀释度下,该碰撞次数增加为5.99×1030/(s·cm3),约为前者40倍,而着火延迟时间的差异在两条件下仅为5倍的关系,可能由于位阻因子的影响所致. 相似文献
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介绍了小型化的内泵浦管状Nd:YAG激光器的设计及初步实验结果,斜效率达2.73%,得到了近3J的脉冲能量输出。 相似文献
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全玻璃真空太阳能热水器强化换热机理分析 总被引:1,自引:0,他引:1
本文应用Ansys Fluent软件对加装导流板全玻璃真空太阳能热水器内自然对流流场进行三维数值模拟计算,并与实验进行对比分析,通过改变导流板长度和位置改善热水器内的流动和换热。结果表明,与无导流板结构相比较,加装导流板后管内涡流消失,流体流动稳定,有利于管内自然对流,增强了换热效果,水箱内温度分层效果明显,有助于提高换热效率;同时得出导流板长度最佳选择范围为1.4~1.6 m,导流板加装在玻璃管中间位置与距管中间位置偏下1/2之间范围内更有助于换热。 相似文献
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No Heading The flux tube solution in the Euclidean spacetime with the color longitudinal electric field in the SU(2) Yang-Mills-Higgs theory with broken gauge symmetry is found. Some arguments are given that this flux tube is a pure quantum object in the SU(3) quantum theory reduced to the SU(2) Yang-Mills-Higgs theory. 相似文献
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D. A. Yarotsky 《Journal of statistical physics》2008,130(5):957-981
It has been observed that in the isotropic spin-1 chain a transition in the asymptotic properties of the correlation function
(commensurate-incommensurate transition) occurs at the AKLT point. We propose a simple random-walk-type argument, explaining
this transition. Also, we consider a modification of the AKLT model, for which this argument can be turned into a rigorous
proof. 相似文献
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