Results 71 to 80 of about 441,091 (198)

Research and Application of Hydraulic Punching Pressure Relief Antireflection Mechanism in Deep “Three-Soft” Outburst Coal Seam

Shock and Vibration, 2021
To solve the problems of gas predrainage in deep seams with “three softs” and low-air permeability, hydraulic punching pressure relief antireflection technology is proposed on the basis of the research background of gas predrainage technology in Lugou ...
Beifang Gu, Yanling Wu
doaj   +1 more source

The Benchmark Ultracool Subdwarf HD 114762B: A Test of Low-Metallicity Atmospheric and Evolutionary Models

, 2009
We present a near-infrared spectroscopic study of HD 114762B, the latest-type metal-poor companion discovered to date and the only ultracool subdwarf with a known metallicity, inferred from the primary star to be [Fe/H] = -0.7.
Allard, Baraffe, Baraffe, Bessell, Bessell, Borysow, Brendan P. Bowler, Brott, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burrows, Butler, Carpenter, Chabrier, Chabrier, Chanamé, Cushing, Cushing, Cushing, Cushing, Cutri, Dahn, Dahn, di Benedetto, Dupuy, Epchtein, Fuhrmann, Fulbright, Gautier, Golimowski, Gonzalez, Goto, Hauschildt, Heiter, Henry, Jao, Jones, Jones, Kirkpatrick, Lachaume, Lada, Laws, Leggett, Leinert, Liu, Lord, Lépine, Lépine, Lépine, Lépine, López-Morales, Markwardt, McElwain, McElwain, McLean, Michael C. Cushing, Michael C. Liu, Ng, Patience, Paulson, Perryman, Potter, Press, Rayner, Riaz, Richer, Richer, Sadakane, Saumon, Saumon, Schweitzer, Skrutskie, Thévenin, Tinney, Tsuji, Tsuji, Valenti   +81 more
core   +1 more source

Review of experimental and theoretical status of the proton radius puzzle [PDF]

, 2017
The discrepancy between the measured Lamb shift in muonic hydrogen and expectations from electron-proton scattering and regular hydrogen spectroscopy has become known as the proton radius puzzle, whose most "mundane" resolution requires a $> 5 \sigma ...
Hill, Richard J.
core   +2 more sources

Double Unloading Gas Control Technology for Fracturing Soft Coal Seams in Overlying Key Strata

Applied Sciences
Based on the ‘three highs and one low’ geological conditions of high gas pressure, high gas content, high ground stress, and low permeability in deep coal seams, this study proposes a dual method of hydraulic fracturing of key layers of overlying rock ...
Jun Xie, Feng Li, Zhengxu Yan, Jingjing Huo   +3 more
doaj   +1 more source

Extract a directionally-dependent effective capillary radius in porous membranes for wicking prediction in lateral flow assays

Materials Today Communications
This study introduces a computational framework for determining a directionally-dependent effective pore radius in porous membranes, enabling precise predictions of capillary-driven wicking behavior, particularly in lateral flow assays (LFAs), a type of medical rapid test widely used for point-of-care testing.
Willfried Kunz, Alexander Spreinat, Christian H. Maack, Andrea Ernst, Jennifer Niessner, Britta Nestler   +5 more
openaire   +2 more sources

Higher dimensional Numerical Relativity: code comparison [PDF]

, 2014
The nonlinear behavior of higher dimensional black hole spacetimes is of interest in several contexts, ranging from an understanding of cosmic censorship to black hole production in high-energy collisions.
Cardoso, Vitor, Gualtieri, Leonardo, Herdeiro, Carlos, Okawa, Hirotada, Shibata, Masaru, Sperhake, Ulrich, Witek, Helvi, Zilhao, Miguel   +7 more
core   +3 more sources

Triton charge radius to next-to-next-to-leading order in pionless effective field theory [PDF]

, 2015
The triton point charge radius is calculated to next-to-next-to-leading order (NNLO) in pionless effective field theory $(\mathrm{EFT}(\ensuremath{\pi}\phantom{\rule{-0.6em}{0ex}}/))$, yielding a prediction of $1.14\ifmmode\pm\else\textpm\fi{}0.19$ fm ...
Jared Vanasse
semanticscholar   +1 more source

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Energy Science & Engineering, 2019
Gas disasters are a major factor influencing safe production in mines: Gas extraction can reduce the gas content in coal seams, providing a guarantee of safer production.
Pan Wei, Changwen Huang, Xuelong Li, Shoujian Peng, Yanan Lu   +4 more
doaj   +1 more source

Permeability enhancement of deep hole pre-splitting blasting in the low permeability coal seam of the Nanting coal mine. [PDF]

PLoS ONE, 2018
To solve the hidden danger of high methane and low permeability gas in the coal mining process, potentially affecting the safety production in an orderly way, we propose the use of deep hole blasting technology to improve the permeability of the coal ...
Zhengyi Ti, Feng Zhang, Jin Pan, Xiaofei Ma, Zheng Shang   +4 more
doaj   +1 more source

Chandra Confirmation of a Pulsar Wind Nebula in DA 495

, 2008
As part of a multiwavelength study of the unusual radio supernova remnant DA 495, we present observations made with the Chandra X-ray Observatory. Imaging and spectroscopic analysis confirms the previously detected X-ray source at the heart of the ...
F. Camilo, Fruscione A., Gotthelf E. V., Hester J. J., Kothes R., R. Kothes, S. Safi‐Harb, T. L. Landecker, Z. Arzoumanian, Zavlin V. E.   +9 more
core   +1 more source