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排序方式： 共有542条查询结果，搜索用时 15 毫秒
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Alison McQuillan Andreas Gaich Arturo Maldonado Glen Byng Markus P?tsch Michael Kostadinovski Michael Tucker Neil Bar Rully Rachmatullah Thamer Yacoub 《矿业科学技术学报(英文版)》2020,30(5):651-658
Slope failures are an inevitable aspect of economic pit slope designs in the mining industry. Large open pit guidelines and industry standards accept up to 30% of benches in open pits to collapse provided that they are controlled and that no personnel are at risk. Rigorous ground control measures including real time monitoring systems at TARP(trigger-action-response-plan) protocols are widely utilized to prevent personnel from being exposed to slope failure risks. Technology and computing capability are rapidly evolving. Aerial photogrammetry techniques using UAV(unmanned aerial vehicle) enable geotechnical engineers and engineering geologists to work faster and more safely by removing themselves from potential line-of-fire near unstable slopes. Slope stability modelling software using limit equilibrium(LE) and finite element(FE) methods in three dimensions(3D) is also becoming more accessible, user-friendly and faster to operate. These key components enable geotechnical engineers to undertake site investigations,develop geotechnical models and assess slope stability faster and in more detail with less exposure to fall of ground hazards in the field. This paper describes the rapid and robust process utilized at BHP Limited for appraising a slope failure at an iron ore mine site in the Pilbara region of Western Australia using a combination of UAV photogrammetry and 3D slope stability models in less than a shift(i.e. less than 12 h). 相似文献
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Barış Demirbay; 《Polymer Engineering and Science》2024,64(1):119-129
The present study article aims to clarify the effect of colloidal polystyrene (PS) latexes with a broad particle size distribution on film formation kinetics of multi-walled carbon nanotube (MWCNT)-added polymer nanocomposites by considering theoretical film formation models. Experimentally, light transmitted from nanocomposite films, each having different weight fractions of MWCNT, was recorded at different annealing temperatures via UV–Visible spectrophotometry. Optical data set was then theoretically elaborated by taking into account void closure and Prager-Tirrell models. Activation energies of viscous flow (ΔH) and backbone motion for reptating PS chains (ΔEB), minimum film formation (T0) and healing (Th) temperatures were then computed from optical data. Experimental results revealed that ΔH required for void closure phenomenon remained unaffected by both nanofiller and size distribution of latexes. On the other hand, it was found that ΔEB for backbone motion promoted upon the addition of nano-fillers into latex particles. Our experimental findings suggested that film formation from MWCNT-added latex films with a broad particle size distribution mainly originates from void closure mechanism since ΔH for viscous flow suppresses ΔEB acquired for backbone motion of repeating PS chains to a great extent. 相似文献
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Flax has a short fiber length that makes the control of fiber orientation in the composite structure very difficult, which leads to composites with inferior mechanical properties. In order to overcome this difficulty, thermally bonded roving (TBR) with a novel structure where the flax fibers are in a twistfree state and are highly oriented to the roving axis have been developed. In this study, the influence of flax/polypropylene (PP) based TBR structures on their unidirectional (UD) composite properties has been explored. In total, five sets of TBR samples with varying the flax contents (40, 50, and 60 wt% levels) and with varying degrees of flax and PP fiber mixing by changing the number of drawing passages (two times, four times, and six times) have been produced in a specially designed machine. The produced TBR samples are consolidated in a compression molding machine and the resultant unidirectional composites are tested for tensile, flexural, and impact properties. It has been observed that the tensile, flexural, and impact properties of the composite samples improve with increasing flax content and with increasing flax and PP fiber mixing in the roving structure. The present composite samples exhibit better mechanical properties compared to those reported for flax/PP composites in literature. It is mainly due to better fiber orientation and fiber‐matrix distribution in the present composite samples. 相似文献
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Maxim Shoshany Hanan Spond Doron E. Bar 《International journal of remote sensing》2019,40(17):6737-6751
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J. Fornell S. González E. Rossinyol S. Suriñach M.D. Baró D.V. Louzguine-Luzgin J.H. Perepezko J. Sort A. Inoue 《Acta Materialia》2010,58(19):6256-6266
Fe36Co36B19.2Si4.8Nb4 bulk glassy rods were synthesized by copper mould casting. The effects of annealing treatments on the microstructure, elastic and mechanical properties of this alloy are investigated. Annealing below the glass transition temperature induces the formation of atomic clusters with pseudo-tenfold symmetry with a close relationship to the Fe23B6 phase. Annealing at sufficiently high temperatures promotes the formation of stable Fe2B and FeB phases and Fe(Co) solid solution. The as-cast alloy exhibits ultra-high hardness (H > 14 GPa), high reduced Young’s modulus (Er > 200 GPa) and good wear resistance. These properties are further enhanced after thermal treatments (H > 18 GPa and Er > 260 GPa are achieved in the fully crystallized sample). The mechanical hardening is accompanied with an increase of the elastic recovery and a decrease of the Poisson’s ratio. The different microstructural mechanisms responsible for these annealing-induced changes in mechanical and elastic properties are discussed. 相似文献
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Doğuş Özkan Yaman Erarslan Egemen Sulukan Levent Kara M. Alper Yılmaz M. Barış Yağcı 《Tribology Letters》2018,66(4):152
In this study, ~?3.5 µm thick multilayer titanium alumina nitride (TiAlN), alumina titanium nitride (AlTiN), and alumina chromium nitride (AlCrN) coatings were deposited on the H13 steel surface by cathodic arc physical vapor deposition (CAPVD) method. The tribological performance of the coatings was evaluated by a tribometer at boundary lubrication condition. Then, coating surfaces were observed by optical microscope, optical profilometer, and atomic force microscope to evaluate the morphological changes, wear volumes, and tribofilm thickness. Also, scanning electron microscopy (energy dispersive X-ray) and X-ray photoelectron spectrometry analyses were applied to coating surfaces for the tribochemical evolution of the tribofilm. Results showed that AlCrN coating performed the best tribological behavior at boundary lubricated condition, when compared to TiAlN and AlTiN coatings and it can be used as a wear resistant cam tappet coating in internal combustion engines. 相似文献