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 37 for “"hydrogen ions"”.
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Hydrogen concentration and temperature affect the 1/f resistance noise in niobium films
"The 1/f resistance fluctuations of thin Nb films was studied from 60 K to 400 K. The resistance noise came from hydrogen ions and other defects placed in the films during sputtering. Hydrogen ions cause three types of 1/f noise at different temperatures. The noise is related to internal friction …
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Hydrogen concentration and temperature affect the 1/f resistance noise in Nb films
"The 1 /f resistance fluctuations of thin Nb films was studied from 60 K to 400 K. The resistance noise came from hydrogen ions and other defects placed in the films during sputtering. Hydrogen ions cause three types of 1/f noise at different temperatures. The noise is related to internal friction …
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Protons and Potentials: How Neurotransmission Influences and is Influenced by pH Transients
Protons, hydrogen ions, are essential to biological functions, contributing to energy metabolism, protein transport, protein modulation, and ion homeostasis. While usually tightly controlled by systemic and cellular processes, free hydrogen ions can overwhelm endogenous buffering during …
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Spectroscopic investigations of new glass-ionomer dental cements
… intensities of signals arising from chromium ions in the aluminium oxide matrix as a function of reaction time.;Different conventional cements were prepared by mixing Fuji II glass with various polyacids. Emission spectra were collected and analyzed. The differences of the setting reactions …
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Geochemistry and Microbiology of Extremely Alkaline (Ph > 12) Ground Water in the Calumet Slag -Fill Aquifer
… have long believed that highly alkaline conditions are poorly supportive of microbial life, in part because an environment lacking in hydrogen ions (H+) is likely to interfere with the proton motive force, and with the need to maintain a circum-neutral intracellular pH (Horikoshi and Akiba, …
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Computational mass transfer moduling of flow through a photocatalytic oxygen generator
… decomposition of water into dissolved oxygen and hydrogen ions. The dissolved oxygen is then transported into a volume of gaseous nitrogen through a diffusion process. A pair of parallel microfluidic channels is employed to expedite the oxygen transport by reducing diffusion lengths, and thereby …
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The effect of oxidation-reduction potential on the outgrowth, toxin production, and chemical inhibition of Clostridium botulinum type A spores
… continuous measurement of Eh and pH and connections for the exchange and mixing of prepurified nitrogen and anaerobic carbon dioxide. Strict anaerobic procedures and prepurified media were utilized to facilitate controlled conditions. In the electrode vessel the media were poised at the …
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Novel Electrochemical Methods for Acidity Monitoring: Theory, Design and Application
… which predicted that the accumulation of hydrogen ions near the electrode is the possible limiting factor for the performance of this design in unbuffered media. To develop a pH-monitoring technology for unbuffered media, Chapter 4 reports on the design, fabrication and testing of …
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Fabrication and Characterization of Narrow-Stripe Quantum Well Laser Diodes
… lasers will be needed in tomorrow's applications. These lasers can only be realized through the application of new device processing techniques, designed to restrict current, carrier, and/or photon flow through the lasing cavity. This work aims to evaluate a non-conventional stripe laser …
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Some factors affecting anion retention in acid soils
… pH, time of equilibration, and the effect of anions themselves in the anion retention in an acid red soil. It was found that chloride was held much less tightly than sulfate by soils. It was also noted that more sulfate was retained at higher concentration. A time factor was also noted in this …
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Modeling the effects of proton irradiation [on] CIGS solar cells
… harsh on photovoltaic devices. Solar protons (hydrogen ions) cause large numbers of vacancies, which act as recombination centers at deep levels and can create compensating defects that reduce the acceptor concentration at shallow levels in semiconductors. This in turn, can reduce the output …
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Effect of aluminum oxyhydroxide coatings on the performance of limestone drains
… the transport, and thus neutralization, of hydrogen ions (H+) derived from acid mine drainage. I used mixed flow reactor experiments to investigate the effect of Al coatings on the diffusion of H+ to the surface of limestone and to quantify how those Al coatings affect the limestone …
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STABILITY OF UPGOING AURORAL ION BEAMS AT 33 R(E) (PLASMA, MAGNETOSPHERE, WAVE-PARTICLE INTERACTIONS)
<p>Simultaneous upflowing hydrogen and oxygen beams of ionospheric origin are seen at altitudes near 3.3 R(,e) in the auroral zone by the DE-1 satellite. The beam observations indicate that, in addition to bulk acceleration, substantial heating in both hydrogen and oxygen has taken place either …
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Hydrogen overvoltage on titanium
<p>"The hydrogen overvoltage has been defined as the difference between the potential of the working electrode (cathode) and the theoretical reversible value for the same solution. This definition brings out the difficulty involved in the measurement of the "theoretical reversible potential for the …
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Modeling Ganymede's Interaction with the Jovian Magnetosphere: Ionospheric Outflow and the Juno PJ34 Flyby
Using a hybrid model (kinetic ions, fluid electrons), we provide a three-dimensional model of Ganymede’s interaction with the Jovian magnetosphere and the moon’s ionospheric outflow. We also provide context for plasma and magnetic field observations from Juno's PJ34 flyby of Ganymede on 07 June …
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New insights in impact ionization and in time-of-flight mass spectroscopy with micrometeoroid detectors by improved impact simulations in the laboratory
… type and on the impact speed. Alkaline ions (Na, K) dominate the mass spectra at low impact speeds. For higher impact speeds appear target ions (Rh), projectile material related ions and hydrogen ions (H). The systematics of characteristic atomic and molecular ion species in the mass …
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The Gastrointestinal Absorption of Lead
… transport of environmentally relevant concentrations of the lead cation has been investigated using the everted sac preparation. Only a small percentage of lead was transported into the serosal compartment but there was a rapid and massive uptake on to the tissue. There was no Significant …
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Characteristics of a Multipole Volume H-Plasma
… characteristics of a plasma in which negative hydrogen ions are formed by volume processes. The ultimate object was to aid in understanding the mechanisms of volume H⁻ production, so enabling the output of this type of device to be optimised for use in the fusion programme. The study entailed …
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Studies into the ion exchange and intercalation properties of AlH2P3O10•2H2O
This thesis describes investigations performed into the ion exchange and intercalation properties of aluminium triphosphate, AlH\(_2\)P\(_3\)O\(_{10}\)•2H\(_2\)O (AlTP). Materials synthesised were characterised using a variety of techniques, including powder neutron and X-ray diffraction, Rietveld …
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