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 156 for “"time dependence"”.
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Time dependence in fine-particle systems
The time dependent behaviour of the magnetisation of a non interacting ensemble of Stoner-Wohlfarth fine particles has been investigated. The particles typically represent the elongated single domain ferromagnetic particles that have widespread application in the magnetic recording industry. The …
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Time-dependence in Markovian decision processes.
… processes with an emphasis on incorporating time-dependence into the system dynamics. When considering such decision processes, we provide value equations that apply to a large range of classes of Markovian decision processes, including Markov decision processes (MDPs) and semi-Markov …
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Time-dependence of ionization and excitation by intense, short electric pulses
In this thesis studies of time-dependent electric pulse ionization and excitation of atomic systems (the hydrogen atom and its negative ion) are performed. Unidirectional (half-cycle) pulses are considered, as well as oscillating (up to several-cycle) pulses. The time scale of the pulses considered …
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Time dependence of nonlinear flow dynamics of near hard sphere suspensions
… of frequency and strain. The volume fraction dependence of experimentally observable characteristic time scales are reported- the longest relaxation time and two cross over times: the first denoting the end of the low frequency terminal region where the linear storage modulus first exceeds the …
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An Experimental Study of the Time Dependence of the Beta Energy Spectrum From Uranium-235 Fission Fragments
Made available in DSpace on 2014-12-09T19:52:18Z (GMT). No. of bitstreams: 1 6607763.pdf: 4018690 bytes, checksum: 6b0649452ef81906e1a88d6d6914fd7f (MD5) Previous issue date: 1966
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Prognostic factors in soft tissue sarcoma. Tissue microarray for immunostaining, the importance of whole-tumor sections and time-dependence.
… Finally, prognostic factors were found to be time-dependent, and most factors lost their prognostic value after 2 years, whereas LR was a strong prognostic factor for metastasis whenever it occurred.
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Part I. Time Dependence of Moessbauer Transmission. Part Ii. Sign of the Nuclear Quadrupole Interaction From Polarized Gamma-Gamma Angular Correlations
Made available in DSpace on 2015-05-12T17:12:23Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6101619.PDF: 3171139 bytes, checksum: 97c30b5aaf5703c4993e27fb4b673c98 (MD5) Previous issue date: 1961
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Healing of defects in a two-dimensional granular crystal
… quantify the size of the defect at prescribed time intervals. This procedure was repeated ninety-four times in order to collect data on a range of misorientations. In some cases, the misorientation angle varied significantly during healing so both initial misorientation and time averaged …
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Application of surface thermal lens technology combined with polarization to the study of polymers
… the STL signal response to the samples. No time dependence in the STL signals of both Zeonex and acrylic was observed when the probe beam was unpolarized, but time dependence of the signals was observed when the probe beam was polarized. Zeonex showed the most significant signal changes …
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Relaxation dynamics in heme proteins
… of lower tiers will dominate the observational time scale. This thesis addresses the following questions: (i) What is the energy landscape of a protein? How does the landscape depend on the environment such as pH and viscosity, and how can it be connected to specific structural parts? (ii) What …
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Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle
… as measured at the surface of the Earth on the time-scale of months to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated. Vigorous discussion has surrounded these phenomena since they were first suggested to have been of global scale, of short duration …
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Factors affecting the fracture energy of a structural adhesive
… rate·to specimen preparation. The rate and time dependence of the adhesive were then investigated using the TDGB specimen. The fractured surfaces were also studied using scanning electron microscopy to determine the mechanisms of failure.
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On the Variability of the Fine Structure Constant
This thesis addresses the issue of the time variability of the fine structure constant, alpha. Recent claims of a varying alpha are set against the established standards of quantum electrodynamical theory and experiments. A study of the feasibility of extracting data on the time dependence of alpha …
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Native Oxides on Aluminum-Bearing Iii-V Semiconductors With Applications to High-Performance Laser Diodes
… is investigated by examining the temperature and time dependence of various Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As and In$\sb{0.5}$(Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$)$\sb{0.5}$P samples.
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A comparison of CP violation in the decays K0 → π+ π- and K-0 → π+ π-
The time dependence of the decay rates K0 -+- TI and -K0 - +- ~ TI was measured in order to test the validity of current formulations of OP violations. An enriched kaon beam at Argonne National Laboratory was used to produce KO (ft) by charge exchange of 850 MeV/c K+ (K-) on complex nuclei. …
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Long-lived states induced by extended illumination of carbonmonoxy-myoglobin
… that extend over many orders of magnitude in time. The bound and unbound states of the system have different spectroscopic signatures and the kinetics of recombination can be measured by monitoring the time dependence of the absorption spectrum of the sample after photodissociation.
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Fast photoemissive probes for shock compression spectroscopy
… is encapsulated in the silica microspheres, the time dependence of the shock-induced intensity loss matched the redshift almost exactly. Since it is easier to make intensity-change measurements rather than spectral-shift measurements, the dye-doped silica microspheres are a significant …
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Large strain time-dependent behavior of elastomeric materials
… investigation a new constitutive model for the time-dependence of unfilled elastomers has been developed. The foundation of the model is that the mechanical behavior can be decomposed into two parts: an equilibrium network corresponding to the state that is approached in long time stress …
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Semiklassische Beschreibung des Spin-Boson-Modells
… in a magnetic field of arbitrary <br>time-dependence is considered. Defining the path integral as the limit <br>of a Wiener regularized expression, the semiclassical approximation <br>leads to a continuous minimal action path with jumps at the <br>endpoints. The resulting semiclassical …
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Measurement and kinetic analysis of complex ion-molecule reactions influenced by multiple electronic surfaces.
… reactions (SPIDRR) technique measures the time dependence of product formation in ion-molecule reactions and is applied here to elucidate the mechanism of several ion-molecule systems. Moreover, the role of the transition metal /metal oxide ion's electronic structure toward chemical …
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