Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 81 for “"nitrogen gas"”.
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Sources And Controls Of Reactive Nitrogen Gas Emissions From A Mojave Desert Ecosystem
… work considerably expands our understanding of gaseous nitrogen (N) loss dynamics in arid ecosystems, a process that directly affects longterm N bioavailability and the release of chemically important gas species into the atmosphere. Chapter one focuses on identifying controls over biological …
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Improving Fried Product and Frying Oil Quality Using Nitrogen Gas in A Pressure Frying System
… This study investigated the feasibility of using nitrogen gas as a substitute for steam in the pressure frying system. The effects of various process conditions (source of pressure, frying temperature and pressure) on fried product and frying oil qualities were evaluated. Frying experiments were …
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A study of the physical adsorption of nitrogen gas on polished 347 stainless steel at very low pressures
… involves the study of the physical adsorption of nitrogen gas on a polished 347 stainless steel surface in the 1 x 10⁻⁹ to 1 x 10⁻⁷ torr pressure region. Characterization studies on the polished 347 stainless steel surface were also conducted utilizing a scanning electron microscope to determine …
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An experimental study of the rotational distribution of N₂⁺B (v) states excited by electron beam impingement upon helium and nitrogen gas mixtures
… may be induced by various methods, including gas discharges, flowing afterglows and electron beams. The first negative nitrogen bands, N₂⁺(B²Σᵤ⁺- X²Σ<sub>g</sub>⁺), have been observed with relatively high intensity from small quantities of nitrogen in helium, also induced by such methods. …
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Influence of low nitrogen gas pressures (< 1.0 MPa) and additives on the nitridation, formation and densification of B and O-SiAlON ceramics produced by reaction bonding and silicothermal reduction
… reduction techniques under different nitrogen pressures. These two methods which use Si and/or halloysite clay in place of Si3N4 in the starting mixture represent a cost efficient alternative to the traditional liquid phase sintering typically employed to produce SiAlONs. The influence …
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Application of Edible Coatings in Maintaining Crispness of Breaded Fried Foods
… 9=like extremely). Two pressure sources (nitrogen gas and steam naturally released from the food material) were used to determine their effects on product crispness, texture, pressed juice, moisture content, fat content and color. Products fried with nitrogen gas as the pressurizing medium …
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The effect of oxidation-reduction potential on the outgrowth and chemical inhibition of Clostridium botulinum type E spores
… tubing for the exchange and mixing of various gases (i.e. prepurified nitrogen, anaerobic carbon dioxide, hydrogen, oxygen) were utilized. Prereduced media and anaerobic procedures were employed to insure controlled conditions and reproducible results. Eh measurements were made of Trypticase …
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The effect of temperature on denitrification kinetics and biological excess phosphorus removal in nutrient removal activated sludge systems in temperate climates (12°C - 20°C)
… sludge plants that incorporate biological nitrogen removal. From earlier research, Casey et al. (1992a) showed that the cause for AA filament proliferation lay in the denitrification behaviour of the N removal systems. They hypothesized that filamentous and floe-forming organisms have …
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The biological removal of phosphorus at the Clark County Sanitation District wastewater treatment plant
… evidenced by very low nitrate levels, produced nitrogen gas that lifted microbes into the clarifier effluent. Weak denitrification allowed for the release of Ortho-P from the microbes into the clarifier effluent. Moderate amounts of denitrification stalled phosphorus release and did not lift …
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Liquid Argon scintillation light quenching due to Nitrogen impurities : measurements performed for the MicroBooNE vertical slice test
… measures late light quenching as a function of nitrogen gas impurity concentration in the liquid argon. We nd marginal evidence for a third component and further steps are identified to improve upon this study. Our late light quenching measurement also agrees with previously published results in …
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Use of acoustic emission to study deformation of mild steel in hydrogen and nitrogen environments
… from one side with either hydrogen or nitrogen was recorded and analyzed. It was found that during monotonic pressurization of disks in nitrogen gas, more cumulative counts were recorded than for similar disks pressurized in hydrogen gas. Possible signatures of the "births" of cracks …
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The Broom Creek Formation (Permian), in southwestern North Dakota: depositional environments and nitrogen occurrence
… logs, the accumulation and distribution of nitrogen gas within the Broom Creek Formation was determined. A volumetric calculation of mapped reserves resulted in an estimate of 2.3 trillion cubic feet (65 billion cubic meters) of nitrogen gas in place. The occurrence of nitrogen in the Broom …
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A Mathematical Model of a Denitrification Metabolic Network in Pseudomonas aeruginosa
… causes microbial production of the greenhouse gas nitrous oxide from denitrification. Complete denitrification is a microbial process of reduction of nitrate to nitrogen gas via nitrite, nitric oxide, and greenhouse gas nitrous oxide. After scanning the microbial community in Lake Erie, …
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Reactive magnetron deposition and characterization of ZrN thin films for decorative and field emission applications
… varying conditions of power, pressure, argon and nitrogen gas flow rates as well as temperature, and were characterized by SEM/EDX, AFM, Colour photospectrometer, RBS and resonant RBS. The films were found to be transparent and semiconducting. They tended to absorb oxygen. The films were found to …
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Investigation of a hydrogen production process through aluminum and water chemical reaction
… a fine size aluminum powder of 149 microns, and nitrogen gas as the medium to facilitate the spraying of the aluminum powder. In order to remove the oxide layer, this thesis study utilized sodium hydroxide as the reaction promoter. The various experimental conditions implemented during the …
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New Mass Spectrometry Approaches to Investigate Proteins and Protein Interactions
… the non-covalent protein interactions into the gas-phase environment of a mass spectrometer. MS is frequently coupled liquid chromatography (LC), which is an analytical technique that is used to separate proteins or peptides before they enter the mass spectrometer. LC can improve the sensitivity …
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Experimental study of drying of a porous medium at sub-residual saturations
… section was maintained at room temperature and gas flow initiated. Four other cases were started initially with heating up the porous medium with no flow, and then letting nitrogen gas flow through the test-section after a steady-state temperature distribution had been reached (denoted in what …
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Nozzle Flow with Vibrational Nonequilibrium
<p>Flow of nitrogen gas through a converging-diverging nozzle is simulated. The flow is modeled using the Navier-Stokes equations that have been modified for vibrational nonequilibrium. The energy equation is replaced by two equations. One equation accounts for energy effects due to the …
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