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In an earlier paper (1978), Gottfried presented a method for combining distribution data for float-sink coal-cleaning devices into a single generalized distribution curve which, for a given device and feed size, is independent of specific gravity of separation. A non-linear, exponential-type equation was utilized to represent the generalized distribution curve, along with the corresponding generalized probable error. Distribution data for six common coal-cleaning devices have previously been treated by this method.This paper is an extension of two previous studies (Gottfried, 1978, 1980). The method described above is applied to three different float-sink coal-cleaning devices: Baum jig (replacing previously reported results), Batac jig and Dynawhirlpool separator. Results for the Baum jig and Batac jig reflect a two-stage separation process, with a set of generalized distribution curves obtained for each stage and another set for the overall separation. Several different feed size fractions are given for each vessel. 相似文献
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In jigging, amplitude and frequency of pulsation, and feed characteristics are the most important process parameters. Effects of these parameters on particle segregation during jigging are studied and explained through experimental as well as numerical means by drawing parallel to liquid/solid fluidization process. This is permissible because jigging could also be viewed as a repetitive process of fluidization and defluidization. Unlike a normal fluidization process, in jigging, particle segregation takes place under rapid rate of change of water velocity. The rate of change of water velocity is decided by the maximum water velocity of the jig cycle, which in turn is controlled primarily by the amplitude. Experimental evidence of the role of maximum water velocity on jigging is given. Next, the feed to the jig that varies in both size and density is conceived as a mixture of many density variant binary systems. This way, the effect of feed characteristic is conveniently analyzed through several indicators of the binary feed namely size ratio, volume fraction, and particle size. Finally, the effect of frequency is studied by considering the particles in the jig bed analogous to tuned mass dampers. This concept is used to explain the preferential segregation of particles at certain jig frequency. 相似文献
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D. Puhan 《Contributions to Mineralogy and Petrology》1984,87(1):98-99
Exsolved magnesian calcite grains containing rods of dolomite were etched to remove the calcite matrix and investigated with a scanning electron microscope. The rods were found to be composed of small rhombohedral dolomite crystals. The single rhombohedrons are stacked with the threefold axis subparallel in all rods of the exsolved host crystal. The curvature of exsolution rods in the host is due to a step by step displacement of the single rhombohedrons. 相似文献
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In the tails of dromaeosaurid dinosaurs and rhamphorhynchid pterosaurs, elongate osteological rods extend anteriorly from the chevrons and the prezygapophyses. These caudal rods are positioned in parallel and are stacked dorsoventrally. The fully articulated and three-dimensionally preserved caudal series of some dromaeosaurid specimens show that individually these caudal rods were flexible, not rigid as previously thought. However, examination of the arrangement of the caudal rods in cross-section indicates that the combined effect of multiple caudal rods did provide substantial rigidity in the dorsoventral, but not in the lateral, plane. The results of digital muscle reconstructions confirm that dromaeosaurids and rhamphorhynchids also shared greatly reduced caudofemoral muscles in the anterior tail region. The striking similarities between the tails of dromaeosaurids and rhamphorhynchids suggest that both evolved under similar behavioral and biomechanical pressures. Combined with recent discoveries of primitive deinonychosaurs that phylogenetically bracket the evolution of dromaeosaurid caudal rods between two arboreal gliding/flying forms, these results are evidence that the unique caudal morphologies of dromaeosaurids and rhamphorhynchids were both adaptations for an aerial lifestyle. 相似文献
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在大管桩内定位施工嵌岩锚杆,是我省首次用来加固码头栈桥的一种可行办法。在下定位装置及锚杆施工工艺过程中,对锚杆进行抗拔试验,其抗拔力达到设计要求,说明本次施工工艺是成功的,为提高码头桥墩的抗技力,又开辟了一条新路,这无疑是很有现实意义的。 相似文献
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胶结颗粒接触力学特性测试装置研制 总被引：5，自引：2，他引：3
为验证天然结构性砂土离散元模拟中接触模型及其参数的合理性,设计了一套用于理想胶结颗粒成型及实现不同加载条件下接触力学特性测试装置。通过胶结颗粒成型装置在两大小相同的铝棒间形成具有特定几何尺寸的胶结物,随后,采用一系列辅助加载装置实现简单及复杂加载条件下胶结颗粒接触力学特性的测试。试验结果表明：该装置可用于胶结颗粒在不同加载条件下接触力学特性的测试,实测胶结颗粒接触力学响应与天然砂土离散元中接触模型基本相符,且其抗剪和抗扭强度均随着法向压力的增大而增大,在三维应力空间中胶结颗粒强度包线呈椭圆抛物面状。 相似文献
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Magnetite whiskers and platelets in the ALH84001 Martian meteorite: evidence of vapor phase growth 总被引：1，自引：0，他引：1
Nanometer-sized magnetite crystals associated with carbonates in fracture zones within Martian meteorite ALH84001 have been examined using analytical transmission electron microscopy. Some of the the crystals exhibit distinctive morphologies: filamentary rods and ribbons, and platelets. The rods and ribbons are elongated along the crystallographic [100] and [111] directions. Some of the rods contain microstructural defects indicating that they grew by spiral growth about screw dislocations. Platelets are flattened along the [100] and [110] directions. These unique morphologies and microstructures constrain the growth conditions of magnetite. The whiskers and platelets most likely formed in the temperature range 500–800°C by direct condensation from a vapor or precipitation from a supercritical fluid, and their properties are inconsistent with a biogenic origin. 相似文献
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高效、低耗冲击式凿岩钎具——工业炸药发明后困扰世界采掘工业的百年难题 总被引：4，自引：0，他引：4
15 0年前瑞典诺贝尔父子继中国火药之后, 发明了硝化甘油胶质炸药用于修路与采矿, 引发了导致社会财富高速增长的“真正意义的工业革命”.192 3年德国施律泰尔发明WC -Co硬质合金, 迅速形成了硬质合金切削刃具和硬质合金凿岩钎具两大产业, 使机械和采掘工业飞速发展, 被誉为“工业的牙齿”.迄今, 现代化的凿岩爆破技术, 已成为人类向岩石圈索取资源和向地下开拓生存与发展空间的主要手段.其中, 用在岩矿石中冲击凿孔的凿岩钎具, 是人类所有机械工具中受力条件最苛刻、使用寿命最短、基础工业必备、技术含量很高的大量消耗性工具.研制长寿命冲击凿岩钎具, 已成为全球采掘工业高效、低耗凿岩必须解决的新世纪重大工程技术难题.这需要凿岩、爆破、岩石破碎、矿业、材料、冶金、钢铁、机械、物理、化工、电子、数学、力学、生物(仿生) 等各方面专家的长期通力合作.建设以“新型硬质合金钎具”和“长寿命冲击凿岩钎杆”为标志的有中国特色的现代化凿岩钎具工业, 是我国新一代“资源-高科技-外向型”民族工业一个具有战略意义的新生长点 相似文献
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土体粒间胶结是建立天然结构性土本构模型的决定性因素之一,将胶结颗粒理想化为两铝棒,在指定位置处形成胶结。采用水泥作为胶结材料,对胶结颗粒进行了一系列简单加载试验（包括拉伸、压缩、压剪、压扭）和复杂应力路径试验,并与蒋明镜等所做的环氧树脂胶结试验进行对比。结果表明：胶结材料对胶结颗粒的力学性能存在一定影响,但基本规律符合蒋明镜等所提出的理想颗粒间胶结模型。水泥胶结抗拉强度低于环氧树脂胶结抗拉强度,但延性相对较好,抗压特性均呈塑性软化现象;二者的抗剪强度初始均随法向压力的增加而增大,当法向压力超过一定值时,又随法向压力的增加而减小（该压力称为界限法向压力）,但水泥胶结的界限法向压力明显高于环氧树脂胶结,扭转试验规律与剪切试验规律类似。在三维应力空间中（法向压力-扭矩-剪力）水泥胶结的强度包线呈橄榄球状,环氧树脂胶结强度包线呈水滴状。 相似文献
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Biaxial compressional tests with two types of stress paths were carried out on an assembly of round bars, which can be crushed to investigate the breakage and deformation mechanisms of granular materials at the mesoscale. The following was found experimentally: (1) upon loading, the crushable rods slide, rotate and break, and finally the breakage band forms for the two types of stress paths and different stress states; and (2) for the axial loading stress path, the round rods mainly fail in the vertically split mode and laterally crushed mode. However, for the lateral unloading stress path, the round rods fail with the combination mode of locally crushed and vertically split. 相似文献
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Mineralogy and Petrology - Monohydrocalcite, CaCO3·H2O, forms a P31 structure composed of composite rods in which a spiral arrangement of Ca ions is accompanied by spiral arrangements of CO3... 相似文献
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本文以东庞矿北井9400采区2#煤层奥灰含水层区域注浆改造一期工程ZKxx3孔施工为例,详细介绍了水平分支孔定向钻探施工设计、钻探施工工艺、主要技术措施等。实践证明,该定向钻探技术能够探查奥陶灰岩含水层区域中的断层、陷落柱等构造的导水通道和富水层段,超前注浆充填奥陶系灰岩上部溶隙和裂隙,封堵断层等构造薄弱区段,扩大加固面积,实现由井下局部治理向地面区域治理煤层底板奥灰水害。由超前探测向掘前治理转变,在时空上达到了区域超前防治水害的目的,取得了显著的经济及环境效益。 相似文献
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Jean‐Yves Delenne Moulay Saïd El Youssoufi Fabien Cherblanc Jean‐Claude Bnet 《国际地质力学数值与分析法杂志》2004,28(15):1577-1594
We investigate the stress–strain behaviour and failure of a cohesive granular material both by experiments and numerical simulations. The material is an assembly of aluminium rods glued together by means of an epoxy resin. The behaviour of cohesive bonds (force–displacement relationship, failure conditions) is characterized by performing simple loading tests (tension/compression, shear…) on a couple of rods. Then, this local behaviour is introduced in a numerical code based on a discrete element method in order to perform numerical compression tests on large samples. The validation of this approach was the main goal of the present investigation that is essentially achieved by a direct comparison between the numerical results and similar experimental tests. As a basic application, we derive the macroscopic cohesion and friction characteristics of random cohesive materials by systematic numerical simulations in a biaxial geometry. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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KAZIMIERZ WIIKOWSKI 《Boreas: An International Journal of Quaternary Research》1989,18(4):357-358
A new simple method of using a stretching device to stabilize coring rods in deep water is described. The method can be used for sediment coring with rod-operated samplers in lakes of a water depth down to 30–40 m. 相似文献
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The Snake River iron ore deposit, in the northern Yukon, Canada, is an enormous, potentially valuable natural resource. Conservative estimates indicate that the deposit contains some thirty thousand million tons of ore. Unfortunately the chemical quality of the mine-run ore falls significantly below established industrial specifications, in particular the phosphorus content is not acceptable. Previous mineralogical examination of the deposit has indicated that the gangue constituents are finely disseminated throughout the ore.An outline is given for the selective agglomeration of the ore to concentrate the phosphorus minerals during grinding. The ground ore is then further treated to agglomerate selectively the iron fraction, which can then be separated from the remaining gangue constituents by differential settling. Successful beneficiation has been achieved on both the crude Snake River ore and a jig concentrate, with some concentrates assaying 69.0% Fe and <0.03% P (iron-ore specification is 0.07% P max.). The effects of various parameters on efficiency of separation are discussed. 相似文献