نتایج جستجو برای: noble gas
تعداد نتایج: 252530 فیلتر نتایج به سال:
Introduction The noble gas xenon exerts neuroprotective effects after various insults, but availability of xenon is limited. Helium and argon are readily available noble gases, but the results of studies using helium as neuroprotective measure are mixed, and the effects of argon are less well studied. In a recent cardiac arrest (CA) study, 70% argon (in O2) administered for 1 hour post CA impro...
The formation of an excess of dissolved gas (“excess air”) in quasi-saturated media was studied by analyzing and interpreting dissolved noble gas concentrations in laboratory column experiments. Using quartz sand filled columns of 1 m length, two different experimental designs were realized. In the first, groundwater recharge was simulated by a unidirectional vertical water flow through the col...
Horizontal drilling and hydraulic fracturing have enhanced unconventional hydrocarbon recovery but raised environmental concerns related to water quality. Because most basins targeted for shale-gas development in the USA have histories of both active and legacy petroleum extraction, confusion about the hydrogeological context of naturally occurring methane in shallow aquifers overlying shales r...
Surface and Subsurface Geochemical Monitoring of an EOR-CO2 Field: Buracica, Brazil — This paper presents a surface and subsurface geochemical survey of the Buracica EOR-CO2 field onshore Brazil. We adopted a methodology coupling the stable isotopes of carbon with noble gases to investigate the adequacy of geochemical monitoring to track deep fluid leakage at the surface. Three campaigns of CO2...
This report summarizes some useful data on the transport characteristics of gas mixtures which are required for detection of charged particles in gas detectors. The requirements for high luminosity tracking are stringent and different at low and high momenta, representing a compromise between a fast gas mixture, small diffusion properties and having a small Lorentz angle, but high primary ioniz...
Introduction: A confusingly large number of noble gas components has been found in meteorites, based on distinct compositions, origins, carrier phases, or release characteristics [1]. The discovery that the carriers of the primordial noble gases survive acid treatment [2] led to the identification of several circumstellar grain types [3]. The oxidisable carbonaceous carrier “phase Q”, however, ...
High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effects. In this paper, results of recent gas jet disruption mitigation experiments on Alcator C-Mod an...
AANA Journal ß October 2010 ß Vol. 78, No. 5 387 Discovered in 1898 by British chemists, xenon is a rare gas belonging to the noble gases of the periodic table. Xenon is used in many different ways, from high-intensity lamps to jet propellant, and in 1939, its anesthetic properties were discovered. Xenon exerts its anesthetic properties, in part, through the noncompetitive inhibition of N-methy...
Purpose: Hyperpolarized noble gas magnetic resonance imaging (MRI) provides a way to map both functional and structural pulmonary information. Specifically in asthmatics, inhaled hyperpolarized gas MRI has been used to evaluate bronchoconstriction (methacholine-challenge [MCh]) and bronchodilation (salbutamol), showing ventilation defects that respond to MCh and salbutamol [1]. Fourier decompos...
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