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Showing 1 to 20 of 638 for “"Lifetimes"”.
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Lifetimes of Excitons in Cuprous Oxide
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-19T19:15:39Z No. of bitstreams: 1 Jang_Joon.pdf: 10079899 bytes, checksum: 98598584fa2b6ebd1cc4d1b1b3954f26 (MD5)
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Recombination lifetimes in gamma-irradiated silicon
The small-signal recombination lifetimes of minority carriers were measured as a function of temperature in silicon before and after irradiation at room temperature by cobalt 60 gamma rays. The resistivity of the boron doped samples ranged between 10 and 5000 ohm-cm, and the resistivity of the …
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Minority carrier lifetimes in germanium on silicon heterostructures
… photoconductance measured effective lifetimes for all structures ranged from 2x103 - 2x104 cm/s. Thicker directly deposited epi-Ge samples indicated that recombination at the Ge-Si interface dominated the effective lifetime. Hydrogen passivation stability of Si and Ge surfaces in air …
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Development of an Optical System for Measuring Fluorescence Lifetimes
This project presents the design of a cost-effective, portable, and simplified fluorescence detection system for measuring fluorescence lifetime decay as an alternative to the available methods currently in use. There are multiple systems available to detect fluorescence of a sample, but they …
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Measurement of the lifetimes of B meson mass eigenstates
… of ... allows the extraction of separate lifetimes for the mass eigenstates, ... and ..., in the ... system. The two lifetimes are combined to extract the width difference, ..., between the two eigenstates. This quantity is extremely useful for over-constraining the Unitarity Triangle and …
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Lifetimes of states in 19Ne above the 15O+ alpha threshold
… release in the CNO cycles is limited by the long lifetimes of 14O and 15O. In explosive stellar scenarios such as X-ray bursts, the energy output is very large, suggesting a breakout from the CNO cycles. 15O(α,γ)19Ne is the first reaction that breaks out of the CNO cycle. Nuclear structure …
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Modeling Ambient Temperature Affected Photovoltaic Inverter IGBT Lifetimes With Rainflow Analysis
… the modeling performed towards estimating lifetimes of IGBTs in PV inverters. Specifically, ambient temperature, solar irradiance, and load demand for a duration of a year were considered in modeling for a chosen integrated gate bipolar transistor (IGBT) from International Rectifier. Two …
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Radiative and predissociative lifetimes of the A²Σ⁺ state of OH
… an interrupted rf discharge through water vapor. Lifetimes are reported for rotational states up to K = 29 and K = 20 in the v = 0 and v = 1 vibrational levels respectively and on the unresolved levels of v =2. A predissociation, previously predicted from relative intensity measurements, resulting …
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Electron beam sizes and lifetimes at MAX II and MAX III
… how measurements of the electron beam sizes and lifetimes were used to investigate and improve the performance of MAX III and to evaluate a change in the MAX II vacuum system. MAX II was the first synchrotron light source to install nonevaporable getter (NEG)-coated dipole vacuum chambers. They …
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Lifetimes of Excited States in Alkali-Halide Crystals Containing F-Centers
Made available in DSpace on 2015-05-12T17:12:31Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6302924.PDF: 4052441 bytes, checksum: a5654db56170e5f0f09a9a9ccad1236d (MD5) Previous issue date: 1962
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Generalization of the BTK Theory to the Case of Finite Quasiparticle Lifetimes
A generalization to the BTK theory is developed based on the fact that the quasiparticle lifetime is finite as a result of the damping caused by the interactions. For this purpose, appropriate self-energy expressions and wave functions are inserted into the strong coupling version of the Bogoliubov …
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The model lifetimes, band intensities, growth scenarios and atmospheric implications of substitute chlorofluorocarbons
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Improved lifetimes and synchronization behavior in multi-grid inertial electrostatic confinement fusion devices
… use of a single cathode grid causes short ion lifetimes and operation at high device pressure for simple ion generation both fundamentally limit the efficiency of these devices. Several improvements, including operation at much lower pressure with ion guns and the use of multiple cathode grids, …
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Sequential estimation of optimal age replacement policies when distribution of lifetimes is phase type.
… (unplanned). In this thesis, the distribution of lifetimes is a known, increasing failure rate phase type distribution. To find the optimal age of replacement, the parameters of the underlying phase type distribution must be estimated. An optimal age sequential estimation procedure is developed. …
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Structure-Composition Relationships and Their Influence on Long Luminescent Lifetimes in Persistent Luminescent Phosphors
… methods to improve the long luminescent lifetimes of known persistent luminescent phosphors (PLPs) and the extension of these materials into medical diagnostic applications. However, the PLPs available today have a limited range of emission wavelengths, low efficiency, and lack chemically …
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A trigger study of CP-violation and lifetimes in Bs → J/ψφ decays in ATLAS
The CP-violating phase φ_s is measured in B_s → J/ψφ decays, using data from the 2010 to 2012 run periods of the ATLAS detector at the LHC at CERN. This measurement potentially provides a means to falsifying the standard model, known to provide insufficient levels of CP-violation to account for the …
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Semi-Empirical Lifetimes for High-Energy Rydberg States of ¹³³Cs Neutral Cesium in a Blackbody Radiation Field
Natural and effective lifetimes have been calculated semi-empirically for high-energy excited states of neutral Cesium, using wave functions obtained through direct inward numerical integration of the Schrödinger equation with a central potential modeled by applying a Norcross polarizability …
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