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 24 for “"falloff"”.
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Automated Estimation of ISIP and Friction Losses in Hydraulic Fracture Treatment Falloff Data
… friction loss from hydraulic fracture treatment falloff data. It illustrated friction loss estimations for 270 stages in 16 shale gas wells drilled from the same pad. The resulting estimates reflect a combination of formation and well completion variations. However, the effort required to analyze …
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Dynamic photon painting
… quality of radiosurgery is to increase the dose falloff rate from high dose regions inside the tumor to low dose regions of nearby healthy tissues and structures. Currently, most radiosurgeries rely on focusing a number of external radiation beams to create a sharp dose falloff. As the number of …
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Degradation of proton and carbon Bragg peaks due to density inhomogeneities
… neglect degradation of the sharp distal dose falloff (Bragg peak, BP) caused by inhomogeneous tissue. There is no appropriate model of this effect - which in turn allowed reduction of related dose deposition uncertainties. This thesis develops a comprehensive analytical model of the …
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Inclusive pion production at large and small transverse momentum in a model of hadrons
… at ISR is in part due to the faster off-shell falloff of exclusive channels relative to inclusive ones; 3) the steeper falloff at Fermilab energies is accounted for in a natural way; and 4) there is a threshold in XL = 2PT/[S] beyond which the spectrum is dominated by fragments of the incident …
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Assessment of the use of prompt gamma emission for proton therapy range verification
… to more effectively exploit the sharp distal falloff in the dose distributions of protons. METHOD & MATERIALS: A model of a cylindrical Lucite phantom with a monoenergetic proton beam and an annular array of ideal photon tallies arranged orthogonal to the beam was developed using the Monte …
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Investigation of the Pressure Dependence of SO3 Formation
… K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 …
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Measurement of transverse spin asymmetries in polarized proton-proton collisions, and the realization of new electromagnetic calorimeters for forward physics
… data for pT >3 GeV/c are consistent with a 1/pT falloff. A constant asymmetry at high pT is excluded at the two sigma level. At mid-rapidity, precision asymmetries for neutral pions and η mesons are measured. These asymmetries are consistent with zero, and are expected to place bounds on the …
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Development of upper limb customized non- isomorphic VR interact ions for reaching, grabbing, and placing objects
… modes (Normal, Object translation, and Falloff). The study focuses on the impacts on time and task completion, upper body lean, reach, engagement and presence levels within VEs. The results indicate that upper limb customized non-isomorphic 3DUIs are acceptable, engaging, and overall …
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Integrated pressure-dependence in automated mechanism generation : a new tool for building gas-phase kinetic models
… capture the effects of pressure-dependence and falloff - even though these effects are important in almost every gas-phase system of interest to engineers and designers. Pressure-dependent reactions cannot be included using simple rate rules. Until now they presented an unresolved quandary for …
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Universality in the Equilibration of Quenched Yukawa One Component Plasmas
… a 1/r potential with an additional exponential falloff with length scale 1/κ expressed in units of the average interparticle spacing. This model is used to approximately describe a wide range of physical systems, especially strongly coupled plasmas; i.e., those which have Γ≥1, where Γ is the …
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Black hole singularities in the framework of gauge/string duality
… hole singularity is encoded in the exponential falloff of finite-temperature correlators at large imaginary frequency. We also find a UV/UV connection that governs physics inside the horizon. For the case the bulk theory lives in 5 dimensions the dual theory is an SU(N) Yang-Mills theory on a …
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Exploring wellbore and reservoir temperature profiles in fluid circulation and production operations
… which provide a required recipe to studying the falloff and build-up temperature record of transient temperature test"--Abstract, page iv.</p>
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Characterizing Locust Anemotaxis: The Impact of Sensory Perturbations on Flight Behavior
… in rotation in a rear locust, with a notable falloff in this interaction beyond 2 cm of horizontal proximity; however, it remains inconclusive whether the rear locust is repelled by or attracted to the front locust.</p> <p>Overall, these findings provide insights into the complex integration …
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Evaluation of diagnostic fracture injection test (DFIT) and rate transient analysis (RTA) in Hereford field, northern DJ Basin
… hydraulic fracture stages and interpreted the falloff data from such tests to obtain effective fracture permeability of the stimulated reservoir volumes. Finally, I evaluate the production data of legacy wells using rate transient analysis (RTA).
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Range Adaptive Proton Therapy For Prostate Cancer
Purpose: The rapid distal falloff of a proton beam allows for sparing of normal tissues distal to the target. However proton beams that aim directly towards critical structures are avoided due to concerns of range uncertainties, such as CT number conversion and anatomy variations. We propose to …
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Radical-molecule reaction dynamics in the low temperature regime.
… 90 to 550 K. The reaction, OH + N02, displayed falloff behavior in the pressure range studied here, so recommendation of the absolute low pressure rate coefficient awaits further pressure dependent study. The purely bimolecular reaction, OH + HBr, has been studied at temperatures between 76 and …
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Thermochemistry and kinetic analysis on radicals of acetaldehyde + O2, allyl radical + O2 and diethyl and chlorodiethyl sulfides
… for k(E) and master equation analysis for falloff. A mechanism for pyrolysis and oxidation of acetaldehyde and its' corresponding radicals is constructed. The competition between reactions of radicals of acetaldehyde with O_2 versus unimolecular decomposition is evaluated versus temperature …
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Computational thermochemistry of hydrocarbons, oxygenates, cyclic alkanes, and furans
… analysis and master equation for falloff and stabilization.
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Transport Properties of Divertor Edge Plasmas Measured with Multi-Spectral Imaging
… codes will underestimate the radial temperature falloff length. This is shown to be true in a comparison of Tₑ measurement to simulations performed with the SOLPS-ITER code. This brings into question the validity of the assumption of diffusive heat transport in the far CFR.
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Experiment, thermodynamic properties and modeling on combustion of methyl tert-butyl ether : isobutane and isobutene and thermodynamic properties of chloro alkanes and alkenes
… energy (k(E)) and master equation analysis for falloff is used to calculate rate constants as function of pressure and temperature. Rate constants for HO_2 radical addition to carbon-carbon double bond calculated at CBS q//MP2(full)/6-3 IG(d) and CBS-q//B3LYP/6-3 IG(d) levels of theory show …
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