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 61 for “"Ion Flux"”.
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WNK Family Kinases and the Regulation of Ion Flux
… genetically linked to a rare type of hypertension. Studies demonstrate that these kinases regulate the activity of a diverse group of proteins that in toto suggest WNKs are involved in ionic homeostasis by means of constitutively regulated endocytosis of ion transporters and channels. The …
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Interstellar helium pickup ion flux variations observed with SOHO/CELIAS
<p>Interstellar pickup ions are formed when neutral atoms freely enter the heliosphere and are subsequently ionized. Once these particles are charged they become a component of the interplanetary plasma and are transported outward with the solar wind (SW). Measurements of these particles give …
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Enhancement of the Negative Ion Flux to Surfaces From Radio-Frequency Processing Discharges
The relative flux of negative ions from rf discharges through CF$\sb4$ and F$\sb2$-He has been studied using mass spectrometry. The negative ion flux impinging on a surface in contact with a glow discharge is usually quite small because of the sheaths formed to contain the more mobile electrons. In …
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Ion flux maps and helicon source efficiency in the VASIMR VX-100 experiment using a moving Langmuir probe array
… paper describes the design, setup, and application of a moving multi-Langmuir probe array that measured and mapped ion flux and plasma source efficiency in a flowing plasma with large (∼1.5 T) external magnetic fields in the VASIMR (Variable Specific Impulse Magnetoplasma Rocket) VX-100 …
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Characterization of neural ion regulation dysfunction during insult and evaluation of micro-opioid receptor activation during simulated ischemia in the pre-botzinger complex
… dependent upon the cells' abilities to maintain ionic homeostasis across their plasma membranes. Even slight alterations in intracellular or extracellular can have a devastating effect on excitability and neural vitality. This thesis investigates several concepts related to ion flux. First, it …
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Mass-spectroscopy and modeling of capacitive coupled hydrogen plasmas
This work presents the characterization of a radio-frequency, capacitively coupled, symmetric, hydrogen plasma. Both steady-state operation and the time-prole of the afterglow when RF power is terminated are investigated. Fluxes of the hydrogen ions, H+ , H+2, H+3, at the grounded electrode are …
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High throughput optical sensor arrays for drug screening
… sensor systems capable of detecting cellular ion flux in multi-well plate format. Optodes are employed as the primary sensors, which are an optically based ion selective polymer. These assays utilize both potassium and sodium selective optodes to provide real time measurements of extracellular …
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Low energy ion beam modification of the titanium silicide (100) reaction
This research investigated the effects of the ion beam assisted deposition process on the interdiffusion and reaction of Ti thin films deposited on Si (100). The analytical techniques employed for the characterization of these thin films included transmission electron microscopy, scanning electron …
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TRPV4 in the Choroid Plexus Epithelium: Pathway Analysis and Implications for Cerebrospinal Fluid Production
… This manifests as a result of either overproduction or underabsorption of CSF leading to increases in pressure, swelling and loss of brain matter. Current treatments for this disease include surgical interventions via the introduction of shunts or endoscopic third ventriculostomy, both of which …
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Reaction Path and Crystallograpy of Cobalt Silicide Formation on Silicon(001) by Reaction Deposition Epitaxy
I show that high-flux low-energy Ar+ ion irradiation during RDE growth dramatically increases the area fraction of untwinned regions from 0.17 in films grown under standard magnetically balanced conditions in which the ratio JAr+/JCo of the incident Ar> to Co fluxes is 1.4 to 0.72 with JAr+/JCo= …
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Skeletal Muscle Energetics and Mechanics: The Effects of Magnesium on Resting and Contracting Muscle as Studied by Phosphorus Magnetic Resonance Spectroscopy
… to the role of magnesium. The accuracy and precision of $\sp{31}$P MRS as a technique for this study was evaluated. A servocontrol system was implemented such that isolated frog skeletal muscles could be made to undergo various isometric or isotonic contractions during acquisition of $\sp{31}$P …
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Nano-cellular microstructure evolution in ion-induced chemical vapor deposition (II-CVD) of copper
A systematic investigation of the microstructure produced in ion-induced chemical vapor deposition (11-CVD) of copper from copper(I)hexafluoroacetylacetonatevinyltrimethylsilane (Cu(I)hfacVTMS) gas precursor is reported. II-CVD involves the ion-driven decomposition of Cu(l)hfacVTMS and subsequent …
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Electrochemically driven mechanical energy harvesting
… chemical potential difference, driving lithium ion flux from the compressed to the tensed electrode to generate electric current. Unbending the device reverses the ion flux, generating electrical current in the opposite direction. The thermodynamic analyses reveal that the ideal …
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Elucidation of Emergent Regional Mechanisms of Heart Muscle Dysfunction in the Mouse Model of Duchenne Muscular Dystrophy
<p>Cardiac dysfunction is a primary cause of mortality in Duchenne Muscular Dystrophy (DMD), potentially related to elevated cytosolic calcium. However, the regional versus global functional consequences of cellular calcium mishandling have not been defined in the whole heart. Here, we elucidate, …
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Transport in Low Pressure Plasma Reactors for Materials Processing
"Ionized metal physical vapor deposition (IMPVD) at pressures of a few mTorr is being increasingly used to deposit diffusion barriers and Cu seed layers into high aspect ratio trenches. Understanding plasma-substrate interactions will be critical to designing the next generation processes as the …
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Energetic Deposition of Niobium Thin Film in Vacuum
… films are expected to be free of solid inclusions commonly seen in solid niobium. For particle accelerators, niobium thin film has the potential to replace the solid niobium in the making of the accelerating structures. In order to understand and improve the superconducting performance of …
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Experimental classification of divertor detachment
… threshold is a major challenge for the operation of future fusion devices such as ITER. For Tungsten, the foreseen ITER divertor target material, the power load must be kept below 5 MW m^2 in continuous operation. This can in ITER only be achieved with the plasma being detached or partially …
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Etching kinetics and surface roughening of polysilicon and dielectric materials in inductively coupled plasma beams
… the feature sidewalls forming anisotropic striations. A clear understanding of the origin and control of sidewall roughening is extremely desirable, particularly at the gate level where variations in line width can adversely impact the electrical performance of the device. In addition, at the …
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Collisionless ion collection by non-emitting spherical bodies in E x B fields
The three-dimensional interaction of a magnetized, collisionless flowing plasma with a non-emitting conducting sphere is solved in the entire range of physically allowed parameters, in the ion-collecting regime. This can be considered as the "spherical Mach probe" problem, establishing how the ion …
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Emission spectroscopy for the study of electric propulsion plasmas
Typical electric propulsion devices rely on the acceleration of highly ionized plasmas to produce thrust at specific impulses unattainable with state-of-the-art chemical systems. This thesis examines the use of a miniaturized Helicon plasma source for an open-ended, electrode-less, cathode-less …
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