The majority of the Middle Cambrian Wheeler Formation in the Drum Mountains was deposited during a single 3rd order sequence. Superimposed onto this sequence are three indistinct 4th order cycles and twenty distinct 5th order cycles. These higher order cycles were likely deposited within short intervals of geologic time (204 to 405 ky). The lower sequence boundary zone occurs within the Swasey Formation. The Transgressive Surface is the contact between the Swasey and Wheeler Formations. The Maximum Flooding Surface is located near the top of the lower Wheeler Formation, which also approximates the base of the Ptychagnostus atavus range zone. The upper sequence boundary is marked by stromatolites, which occur near the top of the upper member of the Wheeler Formation in the Drum Mountains. Deposition of the Wheeler Formation in the Drum Mountains was controlled by eustacy and tectonics. Local normal faulting associated with Middle Cambrian postrifting thermal subsidence may have caused some of the 5th order cycles. The cycles and surfaces defined in this stratigraphic analysis, and the base of the Ptychagnostus atavus and P. gibbus range-zones, can be used to correlate strata occurring in other localities in the eastern Great Basin. In addition, this study enables the evaluation of the effect of tectonics (faulting) versus global eustacy on the sedimentary regime occurring within the Middle Cambrian House Range Embayment.

The Middle Cambrian Wheeler Formation is interpreted as having been deposited in the shallow ramp and deeper basin environments of the House Range embayment (HRE), presumably, during a single third-order sequence. In the Drum Mountains, the Wheeler Formation (295 m thick) is dominated by proximal and distal ramp deposits; at Ma~um Pass, the Wheeler Formation (190m thick) is dominated by basinal shale deposits. The Wheeler Formation contains only one biozone marker; the first appearance of Ptyhagnostus atavus. Lack of other chronostratigraphic markers and distinctive stratal patterns in the basinal facies makes correlation along this ramp-to-basin transect difficult. Therefore, carbon-isotope stratigraphy and total organic carbon analysis were tested for their utility as intra basinal correlation tools. 813Ccarbonate isotope values range from -1.7% to 0.07%o (PDB) at Marjum Pass and -1.1% to 1.4% (PDB) in the Drum Mountains; previously reported 813Ccarbonate values in the Great Basin for this time interval range between -2% to 2% (PDB). Both localities show small-scale isotope variability, however, this variability is thought to be the result of local isotopic effects and was not used for correlation. TOC values obtained from both sections increase upsection, define a distinct peak, then decrease upsection. These peaks are associated with shale facies and occur near the maximum flooding surface in both sections, indicating that the TOC results could be used for correlation between sections. The lithologic cyclicity recognized in the shallow-water deposits at the Drum Mountains locality have also been recognized in the deeper-water deposits at Ma~um Pass. At each locality the meter-scale cycles shallow upward and display similar stacking patterns. Because cyclicity is preserved in both sections and the total stratigraphic thickness and cycle thickness decrease toward the embayment-controlling fault, it is probable that the cyclicity was the result of small-scale eustatic changes in sea level rather than episodic tectonism. This ramp-to-basin correlation also supportS the validity of P. atavus as a global biostratigraphic marker. The first appearance of Ptydnagostus atavus has been found below the interpreted maximum flooding surface and was coeval with transgression in both localities, indicating that its appearance was likely synchronous.

no / Over the last century there have been a number of proposals to ground both local and cosmic arrows of time: from the Second law to the Growing Block Universe, from Decoherence to Earman’s time-direction heresy. The latter proposal rejects the traditional association of the Second law of thermodynamics with arrows of time. But it seems that notions like entropy and related notions – phase space volumes and typicality – are not easily banned from discussions of temporal arrows. A close reading of Eddington’s thinking on these questions reveals that his views underwent a considerable development. In particular Eddington abandoned his identification of the arrows of time with the increase in entropy and began to see the Second law as a criterion for temporal arrows. In the process, Eddington also developed an argument against Loschmidt’s reversibility objections, in terms of an expanding universe. This latter argument brings his contribution close to contemporary thinking in terms of Liouville’s theorem, the topology of phase space and typicality arguments. Their reliability to deliver arrows of time will therefore be considered. Are there arrows of time? This question is related to the epistemological views of both Eddington and Wheeler. They insisted on the role of inferences in scientific thinking. Physical reality was to be inferred from data (Eddington) or information (Wheeler) about the physical universe. The paper will conclude that the arrows of time are equally to be regarded as conceptual inferences from various physical criteria – not just entropy – which the universe makes available to us.

FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico / Wormholes sÃo estruturas exÃticas que podem ligar regiÃes longÃnquas do espaÃo e por isso sÃo bastante visados como objeto de pesquisa. Pode-se mostrar que buracos negros possuem modos de vibraÃÃo amortecidos, os chamados de modos quase-normais. Esses modos sÃo responsÃveis por irradiar as ondas gravitacionais para espaÃo. Isso se deve ao fato de pequenas perturbaÃÃes na mÃtrica poderem ser descritas pelas equaÃÃes de Einstein, em forma de equaÃÃes de onda. Esse comportamento à semelhante para wormholes, onde devemos encontrar um potencial de Regge-Wheeler associado a equaÃÃo de onda. Nosso objetivo nesse trabalho serà tentar ver se à possÃvel encontrarmos um potencial do tipo Regge-Wheeler para um wormhole, que se supÃem ser sustentado pela matÃria escura na regiÃo dos halos galÃcticos. E por consequÃncia, verificarmos se à possÃvel determinar modos quase-normais usando o mÃtodo WKB, para esse wormhole em particular. / Wormholes are exotic structures that can connect distant regions of space and therefore are highly targeted as a research object. It can be shown that black holes have damped vibration modes, The so-called quasi-normal modes. These modes are responsible for radiating gravitational waves to space. This is due to the fact that small disturbances in the metric can be described by Einsteinâs equations, in the form of wave equations. This behavior is similar for wormholes, where we must find a Regge-Wheeler potential associated with the wave equation. Our goal in this work will be to see if it is possible to find Regge-Wheeler potential for a wormhole, Which are supposed to be sustained by dark matter in the region of galactic halos. And consequently, Verify if it is possible to determine quasi-normal modes using the WKB method, for that particular wormhole.

OLIVEIRA, R. dos. Wormhole do halo central da galáxia e modos quase-normais. 2017. 79 f. Dissertação (Mestrado em Física) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2017. / Submitted by Giordana Silva (giordana.nascimento@gmail.com) on 2017-04-12T22:32:15Z No. of bitstreams: 1 2017_dis_roliveira.pdf: 2016508 bytes, checksum: b13e51c1946445379ebd0aa6da75f18b (MD5) / Approved for entry into archive by Giordana Silva (giordana.nascimento@gmail.com) on 2017-04-12T22:32:44Z (GMT) No. of bitstreams: 1 2017_dis_roliveira.pdf: 2016508 bytes, checksum: b13e51c1946445379ebd0aa6da75f18b (MD5) / Made available in DSpace on 2017-04-12T22:32:44Z (GMT). No. of bitstreams: 1 2017_dis_roliveira.pdf: 2016508 bytes, checksum: b13e51c1946445379ebd0aa6da75f18b (MD5) Previous issue date: 2017 / Wormholes are exotic structures that can connect distant regions of space and therefore are highly targeted as a research object. It can be shown that black holes have damped vibration modes, The so-called quasi-normal modes. These modes are responsible for radiating gravitational waves to space. This is due to the fact that small disturbances in the metric can be described by Einstein’s equations, in the form of wave equations. This behavior is similar for wormholes, where we must find a Regge-Wheeler potential associated with the wave equation. Our goal in this work will be to see if it is possible to find Regge-Wheeler potential for a wormhole, Which are supposed to be sustained by dark matter in the region of galactic halos. And consequently, Verify if it is possible to determine quasi-normal modes using the WKB method, for that particular wormhole. / Wormholes são estruturas exóticas que podem ligar regiões longínquas do espaço e por isso são bastante visados como objeto de pesquisa. Pode-se mostrar que buracos negros possuem modos de vibração amortecidos, os chamados de modos quase-normais. Esses modos são responsáveis por irradiar as ondas gravitacionais para espaço. Isso se deve ao fato de pequenas perturbações na métrica poderem ser descritas pelas equações de Einstein, em forma de equações de onda. Esse comportamento é semelhante para wormholes, onde devemos encontrar um potencial de Regge-Wheeler associado a equação de onda. Nosso objetivo nesse trabalho será tentar ver se é possível encontrarmos um potencial do tipo Regge-Wheeler para um wormhole, que se supõem ser sustentado pela matéria escura na região dos halos galácticos. E por consequência, verificarmos se é possível determinar modos quase-normais usando o método WKB, para esse wormhole em particular.

Thesis (D.A.)--Illinois State University, 2000. / Title from title page screen, viewed July 31, 2006. Dissertation Committee: Louis G. Perez (chair), Lawrence W. McBride, Sharon S. MacDonald. Includes bibliographical references (leaves 340-370) and abstract. Also available in print.

This thesis deals with Burrows-Wheeler transform (BWT) and possibilities of acceleration of this transform on graphics processing unit (GPU). Methods of compression based on BWT are introduced, as well as software libraries CUDA and OpenCL for writing programs for GPU. Parallel variants of BWT are implemented, as well as following steps necessary for compression, using CUDA library. Amount of compression of used approaches are tested and parallel versions are compared to their sequential counterparts.

No description available.

No description available.

Activated carbon is an adsorbent that is commonly used for removing organic contaminants from air due to its abundant pores and large internal surface area. This thesis is concerned with the static adsorption capacity and adsorption kinetics for single and binary organic compounds on different types of activated carbon. These are important parameters for the design of filters and for the estimation of filter service life. Existing predictive models for adsorption capacity and kinetics are based on fundamental “hard” knowledge of adsorption mechanisms. These models have several drawbacks, especially in complex situations, and extensive experimental data are often needed as inputs. In this work we present a systematic approach that can contribute to the further development of predictive models, especially for complex situations. The approach is based on Multivariate Data Analysis (MVDA), which is ideally suited for the development of soft models without incorporating any assumptions about the mathematical form or fundamental physical principles involved. Adsorption capacity and adsorption kinetics depend on the properties of the carbon and the adsorbate as well as experimental conditions. Therefore, to make general statements regarding adsorption capacity and kinetics it is important for the resulting models to be representative of the conditions they will simulate. Accordingly, the first step in the investigations underlying this thesis was to select a minimum number of representative and chemically diverse organic compounds. The next steps were to study the dependence of the derived affinity coefficient, β, in the Dubinin-Radushkevich equation on properties of organic compounds and to establish a new, improved model. This new model demonstrates the importance of adding descriptors for the specific interaction with the carbon surface to the size and shape descriptors. The adsorption capacities of the same eight organic compounds at low relative pressures were correlated with compound properties. It was found that different compound properties are important in the various stages of adsorption, reflecting the fact that different mechanisms are involved. Ideal adsorbed solution theory (IAST) in combination with the Freundlich equation was developed to predict the adsorption capacities of binary organic compound mixtures. A new model was proposed for predicting the rate coefficient of the Wheeler-Jonas equation which is valid for breakthrough ratios up to 20%. Finally, it was shown that the Wheeler-Jonas equation can be adapted to describe the breakthrough curves of binary mixtures. New models were proposed for predicting its parameters, the adsorption rate coefficients, and the adsorption capacities for both components of the binary mixture. Thus, multivariate data analysis can not only be used to assist in the understanding of adsorption mechanisms, but also contribute to the development of predictive models of adsorption capacity and breakthrough time for single and binary organic compounds.