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Showing 1 to 20 of 96 for “"gas mixture"”.
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Separating a Gas Mixture Into Its Constituent Analytes Using Fica
… becomes significantly more complicated when a mixture of analytes is presented to the sensor array. Conventional methods that are employed in gas mixture identification are plagued by several design issues like: complexity, scalability, and flexibility. This thesis derives and develops a novel …
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An experimental investigation of thermal diffusion in a binary gas mixture
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1964.
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Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen
The use of a sulfur dioxide - oxygen gas mixture to selectively remove manganese from other metals, such as cobalt and nickel, from leach solutions is kinetically favourable and inexpensive. However, this technology for precipitating manganese has not been used commercially, mainly due to a lack of …
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In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions
… two methods described herein will be an in-situ gas sensor using Raman Spectroscopy and considerations for a laser-induced breakdown spectroscopic method geared towards in-situ analysis of hydrothermal vents. </p> <p> Chapter 1 will describe a novel, yet simple gas sensor that utilizes a …
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ΕΞΑΤΜΙΣΗ ΑΜΜΩΝΙΑΣ ΣΕ ΥΔΡΟΓΟΝΟ 25 BAR
… AND TRANSPORT PROPERTIES OF THE NH3/H2 GAS MIXTURE AS WELLAS THE EVAPORATION PROCESS OF NH3 IN NH3/H2 ATMOSPHERE THAT TAKES PLACE IN NEUTRAL GAS ABSORPTION REFRIGERATION UNITS. THE DATA OBTAINED ARE USED TO CALCULATE THE "PSYCHROMETRIC PROBLEM" AND THE EVAPORATION PROCESS WITHIN AN …
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Prandtl-Meyer expansion of an ionizing monatomic gas
The Prandtl-Meyer flow of a pure, monatomic gas, including the effects of ionization and recombination, has been numerically calculated. Expressions describing the thermodynamic state of the gas mixture were obtained from statistical mechanics, the components making up the mixture being considered …
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Optical properties of nanostructured silicon-rich silicon dioxide
… sputtering from a Si target in an O2/Ar gas mixture. The film stoichiometry was controlled by varying the power applied to the Si target or changing the percentage of 02 in the gas mixture. A deposition model is presented which incorporates the physical and chemical aspects of the …
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Mass Transfer of Alkane Solvents-CO2-Heavy Oil Systems in the Absence and Presence of Porous Media Under Reservoir Conditions
… due to heat loss to over- and under-burdens, gas injection is considered to be an effective alternative. One of the major mechanisms associated with gas injection is the molecular diffusion of dissolved gas(es) which reduce the viscosity of heavy oil while inducing oil swelling. Physically, …
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Dynamics of High- and Low -Pressure Plasma Remediation
… (UV) lighting sources was also studied. The mixture Xe/Cl2 ≈ 99/1 was found to be an optimum gas mixture for the generation of the XeCl*. Higher applied voltage improves both the intensity and efficiency of UV photon generations. The strong attachment at high Cl2 concentration (e.g., ≥5%) …
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Predictable Reactive Ion Etching of Gallium-Arsenide and Aluminum - Gallium-Arsenide in Hydrogen-Chloride/argon Radio Frequency Discharges
… has been studied as a function of RF power, gas mixture, and applied bias. The bias voltage, defined as the difference between the substrate and the time averaged plasma floating potentials, was found to best predict the etch rate. The etch rate of AlGaAs was equivalent to that of GaAs. …
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Calculation of thermodynamic properties of gas mixtures at high temperatures
Thermodynamic properties are calculated for mixtures of ideal gases in equilibrium for temperatures up to 15,000° K. Results for air and a model Mars atmosphere are given. The equilibrium composition of a gas mixture at a given temperature and pressure is determined by minimizing the Gibbs free …
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Effect of oxygen and carbon dioxide tensions on release of sugars from peanut roots under gnotobiotic conditions
… experiments were conducted. In all three, N₂ gas was metered to the roots of six plants in each of two isolator chambers. In addition, in the first study, roots of six plants in each of two isolator chambers received a gas mixture composed of 21% O₂, 10% CO₂, and 69% N₂; in the second study, …
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Selective Reduction of Laterite Ore
… < 53 μm was studied at 700-1000 ℃ in the CO-CO2 gas mixture containing 20-70 vol% CO; the gas flow rate varied in the range 350- 1050 mL/min. Reduced ore was leached in the Br-CH3OH solution to extract metallic Ni, Co and Fe, which amount was determined using ICP-AES analysis. The project also …
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The effects of theophylline on the in vitro respiratory response to hypoxia
… fluid (aCSF), equilibrated with a hyperoxic gas mixture (95% O_2, 5% CO_2) as a control, and anoxic mixture (0% O_2, 5% CO_2, 95% N_2) to create severe hypoxia at the tissue level. Using suction electrodes, extracellular population activities of respiratory neurons is recorded from brainstem …
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An Investigation into the Relative Effectiveness of CO2 and Hydrocarbon Gas as an EOR Injectant for a Marginal Onshore USA Sandstone Reservoir
… CO2 supply is not always easily available, and gas transportation costs may be prohibitive especially for marginal assets. The shale boom has flooded the market with natural gas, with an accompanying drop in gas prices. The relative abundance of hydrocarbon gas warrants investigation into the …
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The molecular design of a new solvent for the absorption of carbon dioxide
Gas absorption, the removal of one or more constitutents from a gas mixture, is widely used in chemical processes. In many gas absorption processes, the gas mixture is already at high pressure and in recent years organic solvents have been developed for the process of physical absorption at high …
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Photoluminescence quenching of organic thin films by transparent conductive oxides
… the oxygen content in the Ar/C)2 sputtering gas mixture, we find that the energy transfer distance decreases from 10--25 A for 0% 02 to less than 2 A for 10% 02. Our experimental results suggest that because excess oxygen reduces oxygen vacancies and defect electronic states in SnO2, it leads …
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A comparative study of the ventilatory responses of the golden hamster, Mesocricetus auratus and the laboratory rat, Rattus norvegicus, under hypercapnic and/or hypoxic gas mixtures
… auratus</i>) to different ambient respiratory gas concentrations with those of the white rat (<i>Rattus norvegicus</i>). Total body plethysmography was used to measure tidal volume (V<sub>T</sub>), respiratory frequency (R<sub>f</sub>), and minute volume (V<sub>E</sub>). The respiratory gases …
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Experimental determination of the volumetric properties for the system CO₂-CH₄-N₂ at 100-1000 bars and 50-300°C
… earth; therefore, thermochemical data on these gas species and their mixtures find application in geochemical modeling of crustal fluids in a wide variety of geologic environments. However, volumetric data for gaseous mixtures are scarce, particularly at high pressures and temperatures. In this …
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