Results 191 to 200 of about 105,637 (251)
Deep Underground Science and Engineering, EarlyView.This study proposes an eco‐friendly coal permeability enhancement technique by utilizing mine waste gangue as an abrasive in high‐pressure water jets. Integrating erosion experiments with smoothed particle hydrodynamics‐finite element method coupled simulations, the research study elucidates the flow field dynamics and a nonlinear solid–liquid ...
Qingxiang Wang +4 more
wiley +1 more source
Modeling proppant transport and settling in a 3D propagating fracture
Deep Underground Science and Engineering, EarlyView.A versatile multiphysics tool is presented for simulating the complex processes involved in hydraulic fracturing treatments. The model couples fracture opening and propagation, variable‐density slurry flow, and proppant particle transport within the multiphysics object‐oriented simulation environment framework, based on two‐phase mixture equations and ...
Robert Egert +2 more
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Deep Underground Science and Engineering, EarlyView.This study proposes an exponentially‐constrained Gaussian mixture model (EcGMM) to quantify vertical fracture heterogeneity in stratified roof strata. The model integrates a piecewise exponential decay term capturing global stress dissipation with Gaussian components representing localized fracture intensification at lithological interfaces.
Huiqing Yuan +5 more
wiley +1 more source
Hammering Away – Influence of Hammer Weights on Positional Hammering Accuracy in Virtual Reality
International Journal of Human–Computer InteractionJens V. Rüppel +9 more
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Injury, 1987
Fifty-five patients who had received an intraocular foreign body as a result of using a hammer were identified during a 4-year period. Of these, 36 had suffered the injury while at work and 19 while undertaking do-it-yourself activities at home. None had been wearing suitable protection.
P, Owen, S J, Keightley, A R, Elkington
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Fifty-five patients who had received an intraocular foreign body as a result of using a hammer were identified during a 4-year period. Of these, 36 had suffered the injury while at work and 19 while undertaking do-it-yourself activities at home. None had been wearing suitable protection.
P, Owen, S J, Keightley, A R, Elkington
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Stochastics and Dynamics, 2008
We show that, with high probability, the undamped, nonlinear inverted pendulum may be "stabilized" over bounded time-intervals if subjected to random shocks.
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We show that, with high probability, the undamped, nonlinear inverted pendulum may be "stabilized" over bounded time-intervals if subjected to random shocks.
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Transactions of the American Institute of Electrical Engineers, 1922
The power hammer has been in use for a long time and there are now on the market many types of power-operated hammers which may be roughly classed according to the nature of the power as follows: Pneumatic, steam, motor and pulley; cam or crank, and electropneumatic drives.
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The power hammer has been in use for a long time and there are now on the market many types of power-operated hammers which may be roughly classed according to the nature of the power as follows: Pneumatic, steam, motor and pulley; cam or crank, and electropneumatic drives.
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Human Resource Management, 1993
AbstractThis article reviews salient features of the foregoing articles contained in this special issue of Human Resource Management. The 360‐degree feedback movement constitutes an important new technology in the practice of human resource management.
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AbstractThis article reviews salient features of the foregoing articles contained in this special issue of Human Resource Management. The 360‐degree feedback movement constitutes an important new technology in the practice of human resource management.
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Increasing the durability of hammers in hammer mills
Metallurgist, 1959At sintering plants which process fused sinter, the l imestone is ground in hammer mills. The coarse l i m e stone entering the mil l is reduced by fr ict ion with the beater (hammers) and the fine fraction passes through the grate into a special bunker.
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