Results 61 to 70 of about 441,091 (198)

Study on influence of superimposed effect of gas extraction in downhole drilling

Meitan kexue jishu
In order to better reveal the change of effective extraction radius and the influence of extraction superposition effect on the extraction effect in the process of coal seam gas extraction, a three-dimensional coal seam gas-solid coupling model is ...
Jun LIU, Peng LU, Zhikuan LIU, Min SU
doaj   +1 more source

Rotating models of young solar-type stars : Exploring braking laws and angular momentum transport processes

, 2016
We study the predicted rotational evolution of solar-type stars from the pre-main sequence to the solar age with 1D rotating evolutionary models including physical ingredients.
Amard, Louis, Bouvier, Jérôme, Charbonnel, Corinne, Gallet, Florian, Palacios, Ana   +4 more
core   +3 more sources

Machine Learning Techniques for Stellar Light Curve Classification [PDF]

, 2018
We apply machine learning techniques in an attempt to predict and classify stellar properties from noisy and sparse time series data. We preprocessed over 94 GB of Kepler light curves from MAST to classify according to ten distinct physical properties ...
Hinners, Trisha, Tat, Kevin, Thorp, Rachel   +2 more
core   +2 more sources

Optimization and Application of Drilling Parameters Based on Gas–Solid Coupling Simulation

Applied Sciences
The layout of directional high-level long boreholes in fracture zones for extracting pressure-relieved gas from goaf is a key technology to address the gas concentration exceedance in upper corners.
Zhiguo Ge, Guochao Yan, Shaoqi Kong, Baodong Zong, Huizhi Liu, Jinjing Huang, Gaochuan Guo   +6 more
doaj   +1 more source

Ultra-High-Pressure Hydraulic Slitting Pressure Relief and Penetration Enhancement Technology and Equipment for Soft Coal Seams

Geofluids, 2022
There is a “bottleneck effect” in the extraction process of ordinary boreholes. It is crucial to enhance the permeability of the boreholes. In this paper, a set of ultra-high-pressure water jet-based drilling and slotting integrated equipment was ...
Xingang Niu, Yi Zhao, Ke Li, Yongjiang Zhang   +3 more
doaj   +1 more source

Atomic Parity Nonconservation: Electroweak Parameters and Nuclear Structure

, 1992
There have been suggestions to measure atomic parity nonconservation (PNC) along an isotopic chain, by taking ratios of observables in order to cancel complicated atomic structure effects.
A. Krasznahorkay, A. M. Martensson Pendrill, B. D. Serot, B. Zeidmann, C. Bouchiat, C. de Jager, C. J. Batty, C. Monroe, C. Olmer, D. B. Kaplan, D. C. Kennedy, D. London, E. D. Commins, E. N. Fortson, E. N. Fortson, E. N. Fortson, E. N. Fortson, F. Garcias, G. Feinberg, G. R. Satchler, G. W. Hoffmann, J. Achtzehnter, J. Ashman, J. D. Walecka, J. Dechargé, J. F. Donnoghue, J. F. Donnoghue, J. Friedrich, L. Ray, L. Ray, L. Wilets, L. Wilets, M. A. Bouchiat, M. A. Bouchiat, M. A. Bouchiat, M. A. Bouchiat, M. A. Bouchiat, M. Beiner, M. C. Noecker, M. M. Sharma, M. Peskin, P. Aufmuth, P. G. Reinhard, P. Quentin, P. Sandars, R. C. Thompson, R. L. Jaffe, S. A. Blundell, S. J. Pollock, S. Weinberg, T. T. S. Kuo, T. W. Donnelly, V. A. Dzuba, V. A. Dzuba, W. D. Meyers, W. Marciano   +55 more
core   +2 more sources

Potentials and Limits of Bose-Einstein Interferometry [PDF]

, 1999
We complete the introduction of Yano-Koonin-Podgoretskii (YKP) parametrization of the correlation function by deriving the corrections to the correlation radii which arise from releasing the popular smoothness approximation and approximation of setting ...
Heinz, Ulrich, Tomasik, Boris
core   +2 more sources

Self-force with (3+1) codes: a primer for numerical relativists

, 2009
Prescriptions for numerical self-force calculations have traditionally been designed for frequency-domain or (1+1) time-domain codes which employ a mode decomposition to facilitate in carrying out a delicate regularization scheme. This has prevented self-
Detweiler, Steven, Diener, Peter, Tichy, Wolfgang, Vega, Ian   +3 more
core   +1 more source

Numerical study of coal reservoir and borehole parameters evaluation considering temperature and multi-borehole superposition effects

Scientific Reports
To reveal the effects of temperature on the effective extraction radius and coal reservoir parameters during gas extraction in bedding boreholes, a hydraulic-mechanical coupling model (HM) and a thermal–hydraulic-mechanical coupling model (THM) for ...
Nan Fan, Yonggang Qiao, Changhua Liu, Aiguo Wang, Cunbao Deng, Xi Chen   +5 more
doaj   +1 more source

Numerical simulation on gas drainage and borehole arrangement parameters of bedding borehole in a coal mine

Gong-kuang zidonghua, 2018
Based on comprehensive consideration of gas flow inertia and slippage effect, a gas drainage flow model was established. Based on engineering background of 12150 coal face of the No.15 coal seam in Songhe Coal Mine, the distribution law of gas pressure ...
ZHANG Bo, XIE Xionggang, XU Shiqing
doaj   +1 more source