Results 171 to 180 of about 333,470 (211)

Gas Quenching with Controllable Heat Extraction

Materials Science Forum, 2007
High pressure gas quenching became a modern way of quenching finally machined engineering components,having many advantages compared to quenching in liquid quenchants.The main shortcoming of this technology is the problem of achieving adequate hardness in the core of bigger workpieces,because of inadequate quenching intensity.Due to the possibility to ...
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Extraction, Territory, and Inequalities: Gas in the Bolivian Chaco

Canadian Journal of Development Studies / Revue canadienne d'études du développement, 2010
Conflicts over extractive industry have emerged as one of the most visible and potentially explosive terrains for struggles over distribution, territory, and inequality in the Andes. We explore these relationships in Bolivia, focusing on gas extraction in the Chaco region of the southeastern department of Tarija.
Bebbington, Denise Humphreys, Bebbington, Anthony J.   +1 more
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Unconventional oil and gas extraction and animal health

Environ. Sci.: Processes Impacts, 2014
This perspectives article discusses the authors' views of the impacts of unconventional oil and gas extraction on animal health and food safety.
M, Bamberger, R E, Oswald
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Understanding Oil and Gas Extraction Worker Fatalities through the Fatalities in Oil and Gas Extraction Database

SPE Health, Safety, Security, Environment, & Social Responsibility Conference - North America, 2017
Abstract The U.S. oil and gas extraction (OGE) industry fatality rate (25.0 deaths per 100,000 workers) remains well above the rate for all U.S. workers (3.7 per 100,000 workers), and in 2014, the U.S. Bureau of Labor Statistics (BLS) recorded an all-time high of 144 OGE worker deaths (BLS, 2015; Mason et al. 2015). OGE is a complicated,
Sophia Rid, Kyla Retzer
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Extraction procedures in gas chromatographic determination of pesticides

Journal of Analytical Chemistry, 2016
Pesticides are necessary for increasing agricultural productivity; however, their enormous use contaminates air, water and food. Among various organic pesticides, organochlorine pesticides (OCPs) are most persistent; and though their use is banned, they are still used illegally.
null Yang Farina, Pauzi Bin Abdullah, Nusrat Bibi   +2 more
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Gas flow to a vertical gas extraction well in deformable MSW landfills

Journal of Hazardous Materials, 2009
Active gas control systems are commonly used in municipal solid waste (MSW) landfills and the design of such systems requires thorough understanding of the gas flow pattern. A model is developed to predict the two-dimensional radial transient gas flow to a vertical gas extraction well in deformable MSW landfills.
Li, Yu, Francisco, Batlle, Jesús, Carrera, Antonio, Lloret   +3 more
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Acid Gas Extraction of Pyridine from Water

Industrial & Engineering Chemistry Research, 1999
Pyridine was extracted from aqueous solutions initially containing 5 or 15 wt % pyridine by using liquid or supercritical carbon dioxide at 10 MPa as a solvent in a mechanically agitated countercurrent extraction column. The lowest pyridine concentration in the raffinate was 0.06 wt %, whereas the pyridine concentration in the extract was 86−94 wt ...
Jauhiainen, Olli, Laitinen, Antero
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Gas Chromatography–Mass Spectrometry of Biofluids and Extracts

2015
Gas chromatography-mass spectrometry (GC-MS) has been widely used in metabonomics analyses of biofluid samples. Biofluids provide a wealth of information about the metabolism of the whole body and from multiple regions of the body that can be used to study general health status and organ function.
Abdul-Hamid M, Emwas, Zeyad A, Al-Talla, Yang, Yang, Najeh M, Kharbatia   +3 more
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Supercritical Gas Extraction of Coal

1988
The fundamentals of supercritical gas extraction is briefly described, and a review of the recent investigations of the factors controlling the supercritical gas extraction of coal is presented.
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From Gas to Gas: Fundamentals of Static Headspace Extraction-Gas Chromatography

LCGC International
Headspace sampling is one of the staple sample introduction techniques for gas chromatography (GC) because it involves the injection of samples already in the vapor phase into the instrument. In this installment, we discuss the fundamentals of headspace extraction, including static versus dynamic extraction, establishing equilibrium in the vial ...
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