Dissertations / Theses on the topic 'Envelope'
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張麗霞 and Lai-ha Freda Cheung. "On envelopes and envelope theorem." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31976505.
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Cheung, Lai-ha Freda. "On envelopes and envelope theorem." Hong Kong : [University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1300573X.
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Parkinson, Jane E. "A novel component of the envelope of extracellular enveloped vaccinia virus." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260015.
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Klingen, Yvonne. "Rhabdovirus Envelope-Switching." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-95283.
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Herrada, Isaline. "Etude des interactions protéine-protéine à l'enveloppe nucléaire." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS278/document.
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Plusieurs publications, parues lors de ma thèse, ont révélé que les protéines de la membrane nucléaireinterne (INM) et plus particulièrement l’émerine, la lamine A, SUN1, l’actine et BAF, jouaient un rôleessentiel dans les propriétés mécaniques du noyau et de la cellule. L’assemblage de l’enveloppenucléaire et les interactions de ces protéines entre-elles sont régulées par des évènements dephosphorylation et d’oligomérisation. Mon objectif était de décrire les évènements moléculairesessentiels à l’assemblage de l’enveloppe nucléaire interne, afin de pouvoir par la suite comprendrecomment l’enveloppe nucléaire répond à un stress mécanique.J’ai dans un premier temps caractérisé les évènements d’oligomérisation et de phosphorylation de laprotéine émerine. J’ai montré que cette protéine était capable de former, in vitro et en cellules, de grosoligomères indispensables à son interaction avec la lamine A. J’ai également observé que desmutations dans l’émerine, aboutissant à la dystrophie musculaire d’Emery-Dreifuss, affectaient lespropriétés d’auto-association de cette protéine.En parallèle, j’ai étudié les interactions entre émerine, lamine, SUN1, actine et BAF in vitro. J’ai pumontrer des interactions directes entre le domaine C-terminal de la lamine A et les protéines émerine,actine et SUN1. Ces trois protéines lient la lamine A sur des surfaces différentes suggérant l’existencede complexes à 3 ou 4 protéines dans la cellule. L’analyse des modes de régulation des interactionsentre ces protéines doit être poursuivie afin de comprendre quels sont les évènements moléculairesessentiels au maintien de l'intégrité nucléaire et à la transmission d’un signal mécanique entre lecytosquelette et le nucléosqueletteDuring my PhD, several papers revealed that the inner nuclear membrane (INM) proteins, andespecially emerin, lamin A, SUN1, actin and BAF, played an essential role in the mechanicalproperties of the nucleus and the cell. The nuclear envelope assembly and the interactions betweenthese proteins are regulated by phosphorylation and oligomerization events. My aim was to describemolecular events essential for inner nuclear envelope assembly as a first step to understand how thenuclear envelope responds to a mechanical stress.I first characterized the oligomerization and phosphorylation states of the protein emerin. I showedthat this protein is capable of forming, in vitro and in cells, large oligomers essential to its interactionwith lamin A. I also observed that several emerin mutations leading to Emery-Dreifuss musculardystrophy impaired the self-association properties of this protein.In parallel, I studied the interactions between emerin, lamin, SUN1, actin and BAF in vitro. I was ableto demonstrate direct interactions between the C-terminal domain of lamin A and the proteins emerin,actin and SUN1. These three proteins bind lamin A on different surfaces suggesting the existence ofcomplexes of 3 or 4 proteins in the cell. Analysis of the mechanisms regulating interactions betweenthese proteins should be pursued in order to understand what are the molecular events responsible forthe maintenance of nuclear integrity and the transmission of a mechanical signal between thecytoskeleton and the nucleoskeleton
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Redwood-Sawyerr, J. A. S. "Constant envelope modulation coding." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356049.
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JUNIOR, ADY CAMBRAIA. "ENVELOPE OF MID-PLANES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25484@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
O Envelope de Retas Médias - ERM consiste da união de três conjuntos invariantes afins: o Affine Envelope Symmetry Set - AESS; o Mid-Parallel Tangents Locus - MPTL; e a Evoluta Afim - EA. O ERM de curvas planas convexas é um assunto que tem sido muito explorado. Porém, não existe na literatura nenhum estudo do ERM para superfícies. Por isso, o objetivo principal desta tese é generalizar o ERM de curvas convexas para superfícies convexas. Para tanto, dividimos a tese em duas partes. A primeira consiste de uma revisão sobre a geometria afim de curvas planas e do estudo do ERM com uma nova abordagem. Na segunda parte realizamos uma breve introdução da geometria afim de hipersuperfícies e a generalização do ERM. Na generalização do ERM, trabalhamos com superfícies, definimos os planos médios e estudamos o que denominamos Envelope de Planos Médios -EPM. Provamos que, o EPM assim como o ERM, é formado por três conjuntos invariantes afins: a Superfície de Centros de 3 mais 3-Cônicas - SC3C; o Mid-Parallel Tangents Surface -MPTS; e a Evoluta de Curvas Médias - ECM.
The Envelope of Mid-Lines - EML consists of the union of three affine invariant sets: the Affine Envelope Symmetry Set - AESS; the Mid-Parallel Tangents Locus - MPTL; and the Affine Evolute. The EML of convex planar curves is a subject that has been very explored. However, there is no study in the literature of the EML for surfaces. Therefore, the main objective of this thesis is to generalize the EML of convex curves to convex surfaces. We divide the writing into two parts. The first part consists of a study of the EML with a new approach. In the second part we consider the EML for surfaces, that we call Envelope of Mid-Planes - EMP. We prove that, the EMP, like the EML, is formed by three affine invariant sets: the Centers of 3 plus 3-Conics Surface - C3CS; the Mid-Parallel Tangents Surface -MPTS; and the Medial Curves Evolute - MCE.
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Hernandez, Gardiol Natalia 1977. "Relational envelope-based planning." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43028.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.Includes bibliographical references (leaves 138-143).
This thesis proposes a synthesis of logic and probability for solving stochastic sequential decision-making problems. We address two main questions: How can we take advantage of logical structure to speed up planning in a principled way? And, how can probability inform the production of a more robust, yet still compact, policy? We can take as inspiration a mobile robot acting in the world: it is faced with a varied amount of sensory data and uncertainty in its action outcomes. Or, consider a logistics planning system: it must deliver a large number of objects to the right place at the right time. Many interesting sequential decision-making domains involve large state spaces, large stochastic action sets, and time pressure to act. In this work, we show how structured representations of the environment's dynamics can constrain and speed up the planning process. We start with a problem domain described in a probabilistic logical description language. Our technique is based on, first, identifying the most parsimonious representation that permits solution of the described problem. Next, we take advantage of the structured problem description to dynamically partition the action space into a set of equivalence classes with respect to this minimal representation. The partitioned action space results in fewer distinct actions. This technique can yield significant gains in planning efficiency. Next, we develop an anytime technique to elaborate on this initial plan. Our approach uses the envelope MDP framework, which creates a Markov decision process out of a subset of the possible state space. This strategy lets an agent begin acting quickly within a restricted part of the full state space, as informed by the original plan, and to judiciously expand its envelope as resources permit. Finally, we show how the representation space itself can be elaborated within the anytime framework.
(cont) This approach balances the need to respond to time-pressure and to produce the most robust policies possible. We present experimental results in some synthetic planning domains and in a simulated military logistics domain.
by Natalia Hernandez Gardiol.
Ph.D.
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Thompson, Steve C. "Constant envelope OFDM phase modulation /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3208635.
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Macaulay, Gavin John. "Wave envelope elements for acoustics." Thesis, University of Canterbury. Mechanical Engineering, 1994. http://hdl.handle.net/10092/5574.
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This thesis develops and extends a method for modelling acoustical propagation in unbounded domains. This wave envelope method is ideally suited for inclusion into existing acoustic finite element formulations. Results are presented for test cases which show close agreement between the wave envelope results and analytical results. Basis function interpolation in the wave envelope elements can be varied from order 2 to order 10, allowing for modelling of complicated pressure fields solely with wave envelope elements. The system to be solved consists of three frequency independent matrices, allowing easy generation of frequency response data. For large systems a frequency response calculation can consume considerable CPU time and a modal decomposition procedure using Ritz vectors is presented that can significantly reduce computation times, with minimal loss in accuracy. The use of Ritz vectors was also found to give better results than the full solution from some situations.
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Xiao, Naiyuan. "Energy-efficiency building envelope technologies." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17697.
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In recent years, the excessive emission of greenhouse gas CO2, it causing globalwarming, already poses a serious threat to human survival. The problem catches theattention all over the world, and promoting the development of building energyefficiency. In order to the sustainable development of human beings, in 1992 theUnited Nations framework convention on climate change (UFCCC) organizationpublished the Kyoto protocol. In the Kyoto protocol, the European countriescommitted that during 2008 and 2012 they would reduce the amount of greenhouseemissions to 8% compare to 1990.[2] Building envelope technologies can helphouseholder reduce the energy consumption use in the building. Building envelopetechnologies used in the project Brogåden – Alingsås which save the energyconsumption from 204 kWh/ m2a to 95 kWh/ m2a in Sweden. While the cost just838SEK/m² or 8% of the total building costs. In China the envelope technologies usedin the project student apartment in Shandong building university save the energyconsumption about 72% compare with the old student apartments.
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Hooper, Jack Charles. "Vertical landing flight envelope definition." Thesis, Luleå tekniska universitet, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80717.
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This paper will investigate the development of a landing footprint for a re-entry vehicle. Vehicles can re-enter the atmosphere with a range of orientations, velocities and flight path angles. The central question is whether a vehicle with any combination of these states can be brought to an acceptable landing condition at a particular landing site and with a particular landing speed. To aide in this investigation several models must be implemented, including that of the atmosphere, the vehicles, the Earth, and the aerodynamics. A detailed analysis of the aerodynamic model will be treated, and the equations of motion subject to these aerodynamic laws will then be compared to results from existing atmospheric reentry software. The principles of optimization will then be employed to generate the footprint of landable states, based on maximum and minimum possible downrange distances, for two vehicle concepts.
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Bouchnak, Imen. "Biogénèse du chloroplaste : Voies d'import alternatives." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAV074.
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Le chloroplaste est un composant majeur de la cellule végétale. Cet organite est le fruit d’une endosymbiose, survenue entre une cellule eucaryote et une cyanobactérie. Ainsi, 95% des gènes codant pour les protéines plastidiales ont été transférés vers le génome nucléaire au cours de l’évolution. En conséquence, la plupart des protéines chloroplastiques sont aujourd’hui codées par le noyau, synthétisées dans le cytosol sous forme de précurseurs dotés d’une une extension N-terminale clivable (le "peptide de transit") et ensuite importées sans les chloroplastes via le système TOC/TIC (Translocons localisés au niveau des membranes externe et interne de l'enveloppe des chloroplastes). Jusqu'à récemment, toutes les protéines destinées aux compartiments chloroplastiques internes étaient censées posséder une séquence d’adressage N-terminale clivable et engager la machinerie d’import général TOC/TIC. Cependant, des études récentes reposant sur des approches protéomiques ont révélé l’existence de plusieurs protéines chloroplastiques dépourvues de la séquence additionnelle clivable. La première évidence de telles protéines dites non canoniques a été fournie par notre équipe, étudiant le protéome de l’enveloppe du chloroplaste d’Arabidopsis, qui a conduit à l’identification d’une protéine quinone oxidoréductase homologue nommée « ceQORH ». Bien que dépourvues de peptide de transit clivable, il s’est avéré que ces protéines sont capables de rejoindre les compartiments chloroplastiques internes. D’autre part, il a été également montré que l’import de ces protéines dans le chloroplaste n’est pas médiée par la machinerie de translocation générale TOC/TIC. De plus, il s’est avéré que ces protéines ont la particularité d’être multilocalisées dans les cellules de différents tissus de la feuille. Cependant, les mécanismes moléculaires qui contrôlent la localisation sub-cellulaire de telles protéines chloroplastiques non canoniques demeurent encore inconnus. Pour mieux caractériser fonctionnellement les composantes des systèmes d’import alternatifs de protéines chloroplastiques non canoniques, nous avons adopté une approche directe qui reposait sur des techniques biochimiques combinant le crosslink chimique, la purification par affinité et la spectrométrie de masse. Cette stratégie nous a permis d’identifier un partenaire, impliqué dans le contrôle de l’adressage de la protéine ceQORH dans le chloroplaste. Alternativement, nous avons réalisé une bio-analyse du protéome de l’enveloppe du chloroplaste et qui nous a permis de revisiter la composition du protéome de l’enveloppe du chloroplaste. Afin d’expliquer la localisation sub-cellulaire variable de la protéine ceQORH, les membres de l’équipe ont émis l’hypothèse d’une interaction probable de cette protéine avec un partenaire cytosolique. Dans la dernière partie de cette étude, nous avons validé l’interaction, in planta, entre ceQORH et son partenaire par une approche génétique qui portait sur l’analyse de l’impact de l’absence de ce dernier sur la régulation de la localisation sub-cellulaire de la protéine ceQORHChloroplasts are a major component of plant cells. Their origin traces back to a cyanobacterial ancestor that was engulfed by an ancient eukaryotic cell and eventually integrated as an organelle during evolution. As a result, more than 95% of the ancestral cyanobacterial genes were transferred to the host cell nucleus. Proteins encoded by these relocated genes need to return to internal chloroplast compartments. This import is mainly achieved by the general TOC/TIC machinery located at the chloroplast surface. Until recently, all proteins destined to chloroplast were believed to possess an N-terminal and cleavable chloroplast targeting peptide, and to engage the TOC/TIC machinery. However, recent studies have revealed the existence of several non-canonical preproteins, lacking cleavable transit peptides. The first evidence for such ‘non-canonical’ chloroplast proteins was provided by our team studying the Arabidopsis chloroplast envelope proteome, leading to the identification of a quinone oxidoreductase homologue termed « ceQORH ». Furthermore, a few such proteins were demonstrated to use alternative targeting pathways, independent of the TOC/TIC machinery. To better characterize components of such alternative targeting machineries, a targeted study combining affinity purification and mass spectrometry aiming to identify alternative receptors at the chloroplast surface has been performed. This study allowed us to identify new “partner” involved in the control of chloroplast targeting of ceQORH protein. Alternatively, we also revisited the chloroplast envelope proteome composition and initiated a gene candidate approach. In addition, some non-canonical proteins are shared by plastids and other cell compartments. However, molecular mechanisms controlling subcellular localization of these non-canonical plastid proteins remain unknown. In order to explain the variable subcellular localization of ceQORH protein, our team hypothesized a probable interaction of ceQORH with a cytosolic partner. In the last part of this study, we validated the interaction between ceQORH and its partner in planta by a genetic approach analyzing the impact of the absence of the cytosolic partner on the regulation of the sub-cellular localization of ceQORH protein
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Bhargava, Anvita. "Investigation de la relation entre les éléments structuraux de la membrane nucléaire interne et l'infection par le VIH." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLT013.
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Lors d'une infection par le virus de l'immunodéficience humaine (VIH), le virus traverse l'enveloppe nucléaire (EN) pour s’intégrer dans le génome de l'hôte. Le VIH accède au noyau à travers les complexes des pores nucléaires (CPN). Cependant, le mécanisme sous-jacent n'est pas entièrement compris. Il a été récemment décrit par plusieurs groupes dont le nôtre, que SUN1 et SUN2, protéines structurales de la membrane nucléaire interne, jouent un rôle dans l'import nucléaire du VIH. Ces travaux ont montré que la modulation des niveaux d’expression de SUN1/2 inhibe l'infection par le VIH, révélant que le virus dépend d'un taux optimal de protéines SUN dans les cellules. La surexpression de SUN dans divers types cellulaires n'a pas d'impact sur la viabilité cellulaire, mais provoque une déformation du noyau et des invaginations de l’EN.Nous observons que la surexpression de SUN1 et SUN2 conduit à une réduction de l'infection par le VIH-1 et le VIH-2 dans les cellules HeLa, ainsi que dans des cellules cibles du VIH, les macrophages primaires dérivés de monocytes et les cellules T CD4+. Nous avons validé aussi que les protéines SUN et la Cyclophiline A (CypA) interagissent fonctionnellement dans l'infection par le VIH.Une spécificité a été observée : SUN1 réprime plus fortement le VIH-1 tandis que SUN2 inhibe préférentiellement le VIH-2. Ces activités spécifiques antivirales sont orientées par les domaines N-terminaux des SUN, qui interagissent avec les lamines. Toutefois, les lamines endogènes ne sont pas nécessaires à l'activité antivirale médiée par SUN.En utilisant les cellules knock down de lamine A/C comme contrôle positif de la déformation nucléaire, aucune corrélation entre la déformation et l'infection n'a été trouvée. L’absence de lamine A/C, contrairement à la surexpression de SUN1/2, ne montre aucun effet antiviral.De plus la surexpression de SUN1 a révélé des propriétés uniques des noyaux : une mobilité réduite de la chromatine et une signature de réparation de l’ADN réduite. L’induction exogène de dommage à l'ADN est bénéfique pour l'infection par le VIH-1 (mais pas le VIH-2). Néanmoins, cette induction dans les cellules qui surexpriment SUN1 n’influence pas l’infection du VIH-1.Ainsi nos résultats suggèrent un rôle de SUN1 dans la modulation de la dynamique nucléaire, en lien étroit avec les voies de réparation de l'ADN, qui conduit à la régulation de l'infection productive du VIH-1During infection by Human Immunodeficiency Virus (HIV), the virus crosses the nuclear envelope (NE) to invade the host genome. HIV gets access to the nucleus by passing through the nuclear pore complex (NPC). However, the underlying mechanism is not fully understood. It was recently described that SUN1 and SUN2, structural proteins of the inner nuclear membrane, play a role in the nuclear import of HIV. Modulating the levels of SUN1 or SUN2 inhibits HIV infection, revealing that the virus depends on a sweet-spot of SUN protein levels in cells. Intringuigly, increasing SUN protein levels in various cell types doesn’t impact cell viability but causes deformation of the nucleus and ruffling of the NE.We observed that overexpression of SUN1 and SUN2 led to reduced infection by both HIV-1 and HIV-2 in HeLa cells, primary monocyte-derived macrophages and CD4+ T cells, with the last two being physiologically relevant HIV target cells. We further validated that SUN proteins and Cyclophilin A (CypA) functionally interact in HIV infection.A strain-specific selectivity was observed in the fact that SUN1 shows stronger restriction of HIV-1 while SUN2 preferentially inhibits HIV-2. These preferential antiviral activities were mapped to the N-terminal, lamin-binding domains of SUN proteins. However, endogenous lamins are not required for SUN-mediated antiviral activity.By using lamin A/C knock down cells as a positive control of nuclear deformation, no simplistic correlation between deformation and infection was found: The absence of lamin A/C, unlike SUN1/2 overexpression, showed no anti-viral activity. Instead, we identified properties that were unique to SUN1 overexpressing nuclei: reduced chromatin mobility and a reduced DNA damage signature. We find that induction of exogenous DNA damage is beneficial for HIV-1 infection (but not HIV-2) in cells. This is not the case for SUN1 overexpressing cells where additional damage does not lead to increased infection, suggesting that SUN1 modulates HIV infection downstream of the DNA damage events.Overall our results suggest a role of SUN1 in modulation of nuclear dynamics, with subsequent interplay with the DNA damage pathway, that leads to control of productive HIV-1 infection
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Wang, Feipeng. "High efficiency linear envelope tracking and envelope elimination and restoration power amplifier for WLAN OFDM applications." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3238429.
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Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed January 4, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 126-131).
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Garnier, Marie. "Characterisation of membrane domains in nuclear envelope assembly : composition, structure and dynamics of nuclear envelope remnants." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444070.
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Garnier, Marie. "Characterisation of membrane domains in nuclear envelope formation : composition, structure and dynamics of nuclear envelope remnants." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13457.
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L'enveloppe nucléaire (EN) est reformée durant chaque mitose du cycle cellulaire et durant la fécondation par un mécanisme de jusion membranaire. Un système développé sur les oursins permet la reproduction de l'événement biologique in vitro et conserve des domaines membranaires naturels essentiels à la formation de l'EN. Ces domaines sont appelés "nuclear envelope remnants" (NER) et sont localisés aux pôles du noyau de sperme. Pour permettre la caractérisation des NER, des nano-technologies complémentaires ont été adaptées au système d'étude. La microscopie électronique et la spectrométrie de masse couplée à l'HPLC ont montré que les NER sont des membranes doubles enrichies en cholestérol et en phosphoinositoles polyphosphorylés et polyinsaturés mais dépournuesde spingomyéline. Une nouvelle méthode d'incorporation a permis l'investigation de la fluidité des NER par RMN du deutérium. Cette étude a démontré que les NER, malgré leur haute teneur en cholestérol, sont des membranes relativement désordonnées.
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Unnikrishnan, Suraj. "Adaptive Envelope Protection Methods for Aircraft." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11478.
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Carefree handling refers to the ability of a pilot to operate an aircraft without the need to continuously monitor aircraft operating limits. At the heart of all carefree handling or maneuvering systems, also referred to as envelope protection systems, are algorithms and methods for predicting future limit violations. Recently, envelope protection methods that have gained more acceptance, translate limit proximity information to its equivalent in the control channel. Envelope protection algorithms either use very small prediction horizon or are static methods with no capability to adapt to changes in system configurations. Adaptive approaches maximizing prediction horizon such as dynamic trim, are only applicable to steady-state-response critical limit parameters. In this thesis, a new adaptive envelope protection method is developed that is applicable to steady-state and transient response critical limit parameters. The approach is based upon devising the most aggressive optimal control profile to the limit boundary and using it to compute control limits. Pilot-in-the-loop evaluations of the proposed approach are conducted at the Georgia Tech Carefree Maneuver lab for transient longitudinal hub moment limit protection. Carefree maneuvering is the dual of carefree handling in the realm of autonomous Uninhabited Aerial Vehicles (UAVs). Designing a flight control system to fully and effectively utilize the operational flight envelope is very difficult. With the increasing role and demands for extreme maneuverability there is a need for developing envelope protection methods for autonomous UAVs. In this thesis, a full-authority automatic envelope protection method is proposed for limit protection in UAVs. The approach uses adaptive estimate of limit parameter dynamics and finite-time horizon predictions to detect impending limit boundary violations. Limit violations are prevented by treating the limit boundary as an obstacle and by correcting nominal control/command inputs to track a limit parameter safe-response profile near the limit boundary. The method is evaluated using software-in-the-loop and flight evaluations on the Georgia Tech unmanned rotorcraft platform- GTMax. The thesis also develops and evaluates an extension for calculating control margins based on restricting limit parameter response aggressiveness near the limit boundary.
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Batty, William. "Envelope function calculations for bandstructure engineering." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843469/.
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In this thesis we describe the calculation of the electronic subband structures of semiconductor quantum wells and superlattices in the Envelope Function Approximation. We show how the results of these calculations demonstrate the possibility for improvement of long-wavelength semiconductor laser device characteristics by bandstructure engineering. We present calculations for proposed strained layer and (111)-grown laser structures. We describe the observation of the pressure dependence of the light-hole mass in a quantum well within the framework of our calculational scheme, perform calculations for SiGe superlattices and give analytic results for quantum well, valence band-edge, effective masses in a 2-band (heavy-hole/light-hole) model.
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He, Runtao. "Characterization of dengue virus envelope protein." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24745.pdf.
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Kruithof, Nico Gerard Hugo. "Envelope surfaces surface design and meshing /." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/292152264.
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Nelson, Paul Christian. "Physiological correlates of temporal envelope perception." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.
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Valli, Peter John Spencer. "SIV envelope evolution and virus virulence." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/83987.
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Benton, Mary Catherine. "An examination of energy envelope theory." Diss., Wichita State University, 2009. http://hdl.handle.net/10057/2373.
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The current study experimentally examined the effectiveness of the Energy Envelope
Theory in explaining the relationship between chronic fatigue syndrome patients’ energy levels
and fatigue within the context of four non-pharmacological treatment conditions. Seventy-four
patients were randomly assigned to one of four treatment conditions: cognitive-behavior therapy
with graded activity, anaerobic exercise, cognitive therapy, and a control condition. Results of
the study suggest that while no one treatment was more effective in reducing fatigue, the most
effective treatment for keeping patients within their energy envelope was cognitive-behavior
therapy with graded activity. In addition, while Energy Envelope Theory may provide
conceptual value, particular components, namely perceived energy, had more predictive power
and was associated with reduced fatigue and greater quality of life.Thesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Psychology
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Jeshen, Ingrid Karin. "Metabolite transporters in the chloroplast envelope." Diss., Ludwig-Maximilians-Universität München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-161859.
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Horn, Joe. "Flight envelope limit detection and avoidance." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/12435.
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Forte, Serene E. "Envelope Determinants of HIV-1 Cytopathicity." eScholarship@UMMS, 1998. http://escholarship.umassmed.edu/gsbs_diss/190.
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In vivo infection with HIV-1 is typically characterized by progressive clinical and immunological deterioration associated with a decrease in CD4 T-cells. The mechanism of CD4 T-cell depletion in vivo and its role in HIV-1 pathogenesis and development of AIDS is not well understood.
My research has focused on understanding the mechanism or mechanisms by which HIV-1 induces cell death. To address this aim, a panel of primary HIV-1 isolates were characterized in vitro for replication kinetics, syncytium formation, and cytopathic effects. From this panel two viral isolates, one from patient A and the other patient D, were selected for further evaluation. Patient A was asymptomatic with absolute CD4 cell count of 2302 at the time of virus isolation and remains so nine years later. Patient D was symptomatic with absolute CD4 cell count of 64 and has subsequently died from AIDS. Both of these patients maintained high viral load in vivo. When the viruses were examined in vitro, they also replicated to high titers. However, there were dramatic differences regarding the induction of cell death by HIV-1 isolates. Viruses obtained from patient A did not induce cell death although they replicated to high titers. In contrast, viruses obtained from patient D were extremely cytopathic in PBMCs with comparable viral replication. Therefore, viral replication alone does not predict the single-cell killing capacity of primary HIV-1 isolates. HIV-1 viruses isolated from an individual with normal CD4 T-cell numbers and an individual with CD4 T-cell depletion replicated to equivalent levels in primary CD4 T-cells. However, the virus isolated from the symptomatic individual induced cell death and the virus isolated from the asymptomatic individual was non-cytopathic in vitro.
It is known that HIV-1 exists in the host as a group of related viruses known as quasispecies. This diversity allows the virus a broad spectrum of genotypes which result in multiple phenotypic properties. It follows then that a single viral isolate may contain a number of variants which differ in their ability to form syncytia, cell tropism, replication kinetics, as well as cytopathic potential. To address this, biological clones were obtained from each of the patients viral quasispecies and characterized for replication and cytopathicity. These clones, GC6 8-4 (isolated from patient A) and HC4 (isolated from patient D) maintained the same viral phenotype as the parental virus. In other words, HIV-1 biological clone GC6 8-4 was non-syncytium inducing (NSI) and non-cytopathic in vitro. In contrast, HIV-1 biological clone HC4 was syncytium inducing (SI) and cytopathic in vitro.
It has been reported that the envelope gene of HIV-1 contains the major determinants of HIV-1 induced CD4 T-cell depletion (17). To understand what may be responsible for the differences in cytopathic behavior between the biological clones, GC6 8-4 and HC4 (42), I analyzed their envelope genes. Chimeric viruses were constructed by switching env regions from V2 through V3 of the biological clones with the corresponding region from the molecular clone NL4-3. These HIV-1 chimeric viruses exhibited similar replication kinetics as well as syncytium inducing abilities. The chimeric virus containing the env region of biological clone, GC6 8-4, was NCP in the single cell killing assay, while the chimeric virus containing the env region of biological clone, HC4, was CP in the single cell killing assay. These studies suggest the presence of a cytopathicity determinant which maps to the envelope region downstream from V2 and through V3 (Stu I at position 6822 to Nhe I at position 7250 based on NL4-3 sequence (101)).
28
Mika, Frank J. "Fast envelope correlation for passive ranging." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26541.
Full text
29
Nabil, Azza. "Performance modelling for advanced envelope systems." Thesis, De Montfort University, 2002. http://hdl.handle.net/2086/4328.
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30
Hall, Philip David. "The structure of common-envelope remnants." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690023.
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31
Byland, Rahel. "Trafficking of primate lentiviral envelope proteins." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445339/.
Full textAbstract:
The assembly of enveloped viruses requires the correct trafficking of the viral envelope or membrane proteins to the site of virus assembly. To understand the molecular and cellular mechanisms in human immunodeficiency virus envelope protein (Env) trafficking, I analysed the activities of putative endocytosis signals in the cytoplasmic domain of Env. Morphological and biochemical analysis of HxB2 Env as well as CD4-Env chimeras revealed two functional endocytosis motifs, the membrane proximal GY712XX0 motif and the C-terminal dileucine motif. Both of these motifs work with equivalent efficiency and show no obvious additive effect. RNAi knock down experiments show that endocytosis mediated by both signals is at least partly dependent on the clathrin pathway and the clathrin adaptor AP-2. Motifs of the Yxx0 type have been implicated in transport to the late endosome and HIV has been reported to assemble on membranes of this compartment. I studied the intracellular itineraries of HIV Env and found clear evidence of trafficking through early endosomes. However, no obvious colocalisation with CD63 or LAMP-1 was observed. Further analysis suggested that Env is transported to an endosomal compartment positive for the tetraspanin CD81, a compartment that has recently been recognised as the site of HIV assembly in macrophages. Env was targeted to this compartment independently of other viral components in HeLa cells as well as in macrophages. In order to identify other cellular components interacting with Env and the machinery responsible for Env incorporation into virions I performed yeasts- hybrid assays. I found that Vps37B, a component of ESCRT-I, which is required for HIV assembly, can interact with both HIV and SIV Env cytoplasmic tails, and that the ubiquitin E3-ligase WWP2 binds SIV Env. These findings may enable us to establish a molecular mechanism for the incorporation of Env into budding HIV particles.
32
Kwiatkowski, jerzy. "Moisture in buildings air-envelope interaction." Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0012/these.pdf.
Full textAbstract:
L'humidité relative de l'air est un des paramètres les plus importants ayant une influence sur le confort, la qualité de l'air intérieur et aussi sur la performance énergétique et la durabilité des enveloppes. Les matériaux qui adsorbent et désorbent l’humidité peuvent être utilisés pour modérer l’amplitude des variations de l’humidité relative et ainsi améliorer le climat intérieur et diminuer les consommations énergétiques. Le transfert de masse dans les matériaux hygroscopiques, même si il est pris dans les simulations dynamiques des bâtiments, il est simplifié. Négliger le transport de vapeur d'eau entre l'air et le matériel, ou appliquer des simplifications peut entraîner de graves erreurs dans l'estimation de l'humidité de l'air. L’objectif de ce travail de thèse est d’examiner les paramètres influençant l’échange hygrique entre l’air intérieur et les matériaux de construction dans des conditions normales d’utilisation. Ce travail a été divisé en deux parties : expérimentale et numérique. Comme les propriétés hygrique des matériaux ont un impact important sur les transferts de masse, des mesures détaillées de la perméabilité à la vapeur et de l’isotherme de sorption ont été effectué. Aussi les coefficients convectifs de transfert de masse ont été mesurés. Le critère d’absorption de masse a montré que le taux de celui-ci ne dépend pas seulement du matériel et des revêtements, mais aussi de la température et le mouvement d’air intérieure. L’expérimentation sur l’évaporation de l’eau sur la surface libre d’un liquide a montré que le coefficient convectif de transfert de masse dépend du potentiel de transfert. Il a été présenté que pour les petites différences dans le taux d'humidité relative, le coefficient de transport est plus petit. Les mesures du coefficient convectif de transfert de masse à partir d'un matériau mince hygroscopique ont montré que la valeur du coefficient ne dépend pas seulement de la différence dans le potentiel de transfert, mais aussi du niveau de potentiel. Pour la même différence, les coefficients convectifs de transfert ont des valeurs inférieures pour des faibles niveaux d'humidité relative. Il a également été montré que le coefficient convectif de transfert de masse a des valeurs inférieures pour les échantillons en position verticale que dans la position horizontale. Dans la dernière partie de cette thèse, un nouveau modèle numérique Humi-mur, pour les simulations du flux massique échangé entre l’air et le matériau a été développé et présenté. Le modèle permet une représentation précise des propriétés hygriques : la perméabilité à la vapeur d’eau et l’isotherme de sorption. L’aspect pratique du modèle l'Humi-mur a été présenté. Les résultats montrent que le tampon d'humidité dans les matériaux peut améliorer la perception de la qualité de l'air et empêcher la croissance microbiologique à la surface de l'enveloppe du bâtiment. Il a également été souligné que négliger les effets d'hystérésis de sorption sur les flux d'humidité peut entraîner de graves erreurs dans les calculsThe aim of this thesis was to study the mass exchange between indoor air and material. The influence of several factors on moisture transfer has been verified. Also the convective mass transfer dependency on the relative humidity condition and position of the material has been checked. Finally, a new module with the sorption hysteresis model, Humi-mur, for calculations of mass flow exchanged between indoor air and material has been developed, validated and integrated into the whole building simulation tool TRNSYS. This powerful tool was used to simulate a realistic room under real climatic conditions. The tests on mass uptake have shown that the rate of mass uptake depends not only on the material and coatings but also, some relationships between mass flux and air movement and temperature have been found. The experiment on water evaporation from a free liquid surface showed that the convective mass transfer coefficient depends on the driving potential value. It was presented that for the smaller difference in the relative humidity the transport coefficient is smaller. The measurements of the convective mass transfer coefficient from a thin hygroscopic material showed that the value of the coefficient depends not only on the difference in the driving potential but also on the level of the driving potential. For the same difference the convective transport coefficient has lower values for a lower level of relative humidity. It was also shown that the convective mass transfer coefficient has lower values for samples in a vertical position than in a horizontal position. Finally, the practical use of the Humi-mur model has been presented. The results show that moisture buffering materials can improve perceived indoor air quality and prevent microbiological growth at the surface of the building envelope. It was also pointed out that neglecting the effect of sorption hysteresis on moisture flux can lead to errors in calculations
33
Vasiliauskaite, Ieva. "Structural characterization of viral envelope glycoproteins." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066507/document.
Full textAbstract:
Les glycoprotéines virales sont impliquées dans les deux principales étapes d’entrée des virus enveloppés dans leurs cellules hôtes : l’attachement des virus aux récepteurs cellulaires et la fusion des membranes virale et cellulaire. Je me suis d’abord attachée à l’étude structurale de la principale glycoprotéine, E2, de deux hépacivirus : la forme B du virus GB (GBV-B) et le virus de l’hépatite C (HCV). Mes tentatives de cristallisation de l’ectodomaine de la protéine E2 du GBV-B sont restées vaines, mais l’analyse des propriétés de ses fragments a suggéré un rôle de son extrémité C-terminale dans la liaison à son récepteur. En parallèle, j’ai co-cristallisé un peptide synthétique correspondant à la principale boucle de liaison de E2 à son récepteur, avec un fragment d’anticorps dirigé contre cette boucle. Etonnament, le peptide forme une hélice , en nette contradiction avec la conformation étendue adoptée dans un fragment du cœur de E2. Associé à des données biochimiques, cela suggère une flexibilité inattendue de cette région de l’ectodomaine d’E2. Dans un second temps, je me suis intéressée à la glycoprotéine F des baculovirus. J’ai résolu la structure du trimère d’un fragment tryptique de F dans sa conformation post-fusion. Cette structure a validé une prédiction selon laquelle la protéine F était une protéine de fusion de classe I homologue à celle des paramyxovirus. La protéine F des baculovirus est ainsi le premier exemple d’une protéine de fusion de classe I encodée par un virus à ADN. Mes résultats confortent donc l’hypothèse que toutes les protéines F ont un ancêtre commun et suggèrent un lien évolutif intéressant entre les virus à ADN, à ARN et leurs hôtesViral glycoproteins are responsible for the two major steps in entry into host cells by enveloped viruses: 1) attachment to cellular receptor/s and 2) fusion of the viral and cellular membranes. My thesis concentrated first on the structural analysis of the major envelope glycoprotein E2 of two hepaciviruses: GB virus B (GBV-B) and hepatitis C virus (HCV). Crystallization of the GBV-B E2 ectodomain remained unsuccessful, but the characterization of truncated versions of E2 suggested an important role of its C-terminal moiety in receptor binding. In parallel, I co-crystallized a synthetic peptide mimicking HCV E2 with an antibody fragment directed against the major receptor-binding loop of E2 that is targeted by broadly neutralizing antibodies. The structure unexpectedly revealed an α-helical peptide conformation, which is in stark contrast to the extended conformation of this region observed in the structure of an E2 core fragment. Together with further biochemical evidence this suggests an unanticipated structural flexibility within this region in the context of the soluble E2 ectodomain. Secondly, I focused on the structural analysis of the baculovirus glycoprotein F. I determined the crystal structure of the post-fusion trimer of a trypsin-truncated F fragment. This structure confirmed previous predictions that baculovirus F protein adopts a class I fusion protein fold and is homologous to the paramyxovirus F protein. Baculovirus F is therefore the first class I fusion protein encoded by a DNA virus. My results support the hypothesis that F proteins may have a common ancestor and imply interesting evolutionary links between DNA and RNA viruses and their hosts
34
Topaloslu, Birol. "Solar Envelope And Form Generation In Architecture." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1042704/index.pdf.
Full textAbstract:
This thesis analyses the issue of solar access in environmentally sensitive attitudes to architecture. The primary intention of the study is to scrutinize the relationship between solar access and building form (volume) and investigate the efficiency of solar control on / by this form by means of &lsquosolar envelope&rsquo
technique which is, first, defined by Knowles and developed in different ways in the last 30 years. Solar envelope in Knowles&rsquo
terms can be defined as the building volume resulting from shadow casting restrictions and must be recognized as a both theoretical and technical method in the form generation of any building. Similar to the concept of maximum developable volume allowed under height restrictions or floor area ratios, solar envelope is, rather, defined by solar access concerns. This method is applicable on single buildings as well as dense urban areas (residential and mix use areas) and is a supportive tool in the form generation in any stage of design. Buildings constructed without exceeding the abstract solar envelope that is constructed on the basis of solar access will be successful in the means of passive solar and low-energy design. Such a success will supply a sustainable development, which is globally discussed as a result of environmental and energy crisis. The aim of this thesis is to represent the method of constructing solar envelope, in case study, with its fundamental aspects and tools. Odtü
kent residences will be the objects of this study. Results of this application will be tested with shadow maps and evaluations both for the existing situation and the proposed envelopes will be developed.
35
Li, Nannan. "Characterization of two chloroplast envelope membrane proteins." Diss., Ludwig-Maximilians-Universität München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-157880.
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Yu, Ian-Ling, and University of Lethbridge Faculty of Arts and Science. "Functional analysis of two baculovirus envelope proteins." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2008, 2008. http://hdl.handle.net/10133/680.
Full textAbstract:
Budded virions of AcMNPV can enter a variety of non-host cells, a characteristic likely
due to the presence of GP64, an envelope protein found on a small subset of
baculoviruses. Results show that AcMNPV's tropism for vertebrate cells can be restricted
- a prerequisite for using AcMNPV for targeted in vivo gene delivery - by replacing the
gp64 gene with SeF from SeMNPV. Unlike the relatively well characterized GP64
protein, the significance and function of the F homolog (Ac23, a pathogenicity factor), is
poorly understood. How Ac23 might contribute to the faster speed of kill was examined
by comparing occlusion bodies and occlusion-derived virions (ODV) of Ac23null mutant
viruses with control viruses at the ultrastructural level. The results show that Ac23null
mutant produces a significantly higher percentage of ODVs with single or lower number
of nucleocapsids than controls, suggesting Ac23 may play a role in multicapsid
envelopment of ODVs.xiii, 101 leaves : ill. (some col.) ; 28 cm. --
37
Tyrrell, Jonathan Charles Anthony. "Computational nonlinear optics beyond the envelope approximation." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439000.
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Fitzpatrick, L. M. "Transport of sugars across the chloroplast envelope." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599063.
Full textAbstract:
The aim of the work described in this thesis was to investigate the role and importance of the glucose transporter in the chloroplast envelope. I believed that further characterisation would contribute to our knowledge of transitory starch degradation at night, and to the control of carbon partitioning. I have supplied tracer quantities of [U-14C]glucose and [U-14C]glycerol in the dark to leaves selected from a diverse range of species, and demonstrated that the net flux in the cytosol, during starch degradation in the dark, is glycolytic, so that a gluconegoenic flux from triose-phosphates to sucrose does not occur. This provides evidence that a flucose transporter, rather than the phosphate translocator, is active in the chloroplast envelope for the synthesis of sucrose, and suggests that glucose transport across the chloroplast envelope is found throughout the plant kingdom. I have demonstrated, using the technique of silicon oil centrifugation, that chloroplasts of wild-type Arabidopsis thaliana and tobacco take up glucose but do not take up maltose from the external medium, that glucose transport in Arabidopsis is unaffected by ATP. I have also shown, by pre-labelling starch with 14CO2, that wild-type Arabidoposis chloroplasts export glucose, but not maltose, during starch degradation in the dark. These results imply that maltose is not an important final product of starch degradation in these species. I used transgenic tobacco plants, with altered levels of the triose-phosphate translocater and little impact on carbon fixation, to investigate the role of hexose transport in carbon partitioning. Careful measurements of phosphate and glucose uptake in chloroplasts of antisense and wild-type plants revealed that there was no alteration in glucose uptake, and that the endogenous wild type capacity may be sufficiently high to account for a compensatory flux in glucose transport. I hypothesised that a mutant of Arabidopsis (sex1), with chloroplasts deficient in glucose transport and accumulating starch, did so through increased starch synthesis at night. To support this, I found no differences in the maximal catalytic activities of amylases, starch phosphorylase, phosphoglucomutase, glucokinase and phosphofructokinase (ATP) in chloroplasts isolated from dark-acclimated leaves of sex1 and the wild type.
39
Richards, S. "The identification of epidermal cell envelope precursors." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382554.
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Batrakou, Dzmitry G. "Nuclear envelope transmembrane proteins in differentiation systems." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/9981.
Full textAbstract:
Historically, our perception of the nuclear envelope has evolved from a simple barrier isolating the genome from the rest of a cell to a complex system that regulates functions including transcription, splicing, DNA replication and repair and development. Several recent proteomic studies uncovered a great variety of nuclear envelope transmembrane proteins (NETs). Diseases associated with several nuclear envelope proteins, mostly NETs, affect many tissues e.g. muscle, adipose tissue, skin, bones. Many NETs of the inner nuclear membrane have been shown to interact with chromatin, suggesting that their influencing gene expression might explain NET roles in disease. This work is focused on finding novel interactions of NETs with chromatin. First, SUN2 post-translational modifications were analysed and the effect of phosphomimetic and phospho-null mutants on heterochromatin and the cytoskeleton was tested by overexpression. However, no obvious changes were found. Second, several tissue-preferential NETs were tested in an adipocyte differentiation system. NET29 changed chromosome 6 position in pre-adipocytes. This matched changes in chromosome positioning that occur during adipocyte differentiation when NET29 is normally induced. Post-translational modifications of NET29 are likely to play a vital role in this process because a phospho-null mutant dominantly blocked chromosome repositioning. The effect of over-expression and down-regulation of NET29 on transcription was tested and results suggest that NET29 negatively regulates expression of myogenic genes during adipogenesis. This thesis is split into six chapters. Chapter I is an overview of the nuclear envelope, adipogenesis and chromatin remodelling, Chapter II is a detailed description of methods used in this study. Chapter III focuses on post-translational modifications of SUN2, as well as trials to identify novel partners of SUN2. Chapter IV and V deal with a novel nuclear envelope transmembrane protein and its role in adipogenesis. Finally, the last chapter includes a discussion and recommended future directions.
41
Cunha, Vinícius Magalhães. "Envelope de cargas em interiores de aeronaves." Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3404.
Full textAbstract:
O objetivo deste trabalho é gerar um envelope de cargas oriundas de diversos ítens de interiores (monumentos), com o intuito de criar uma configuração interna única, capaz de cobrir todos os pontos críticos da estrutura interna (piso) de uma aeronave, respeitando, ainda, todos os requisitos de certificação aplicáveis para a categoria de aeronaves de transporte de 70 passageiros. A distribuição dos monumentos na fuselagem é divida por zonas. Cada zona possui uma série de monumentos capazes de serem montados e cada monumento possui uma série de insertos possíveis de serem montados em sua configuração interna (fornos, cafeteiras, aquecedores, etc.), de acordo com a necessidade de cada cliente. Desta forma, do ponto de vista de estruturas de interiores, cada configuração é única e necessita, portanto, de uma análise estrutural específica. A partir dos resultados deste trabalho (envelope de todas as opções disponíveis) será possível analisar uma "super-configuração", substanciando todas as opções atualmente disponíveis para os clientes. Rapidez na certificação estrutural de uma nova configuração, economia de mão-de-obra de engenharia e facilidade para mudanças de configurações internas para as aeronaves da frota estão entre os principais benefícios deste trabalho.
42
Abler, Craig Bennett 1975. "Spectral envelope estimation for transient event detection." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47690.
Full textAbstract:
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.Includes bibliographical references (p. 133-134).
A Nonintursive Load Monitor (NILM) is a device that determines the operating schedule of electric loads by properly locating and identifying transient events in the spectral envelopes of the current waveform measured at the utility service entry. The spectral envelopes of the current waveform are the coefficients of its time varying Fourier series representation and as such can be estimated by low-pass filtering the current mixed with appropriate basis sinusoids. Spectral envelope estimators have been termed pre-processors. In this thesis, two pre-processors were designed. The first utilizes magic sine waves as the basis functions instead of sinusoids. The second is a digital pre-processor developed on a digital signal processor. The digital design was used in complete NILM platforms and its performance is analyzed to determine the quality of the envelopes produced. Finally, avenues for further work on the digital pre-processing unit are suggested.
by Craig Bennett Abler.
S.B.and M.Eng.
43
Narayanamurthi, Manohar. "All-pole spectral envelope modeling of speech /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9956457.
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Tseng, Chien H. "Iterative algorithms for envelope-constrained filter design." Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/1957.
Full textAbstract:
The design of envelope-constrained (EC) filters is considered for the time-domain synthesis of filters for signal processing problems. The objective is to achieve minimal noise enhancement where the shape of the filter output to a specified input signal is constrained to lie within prescribed upper and lower bounds. Traditionally, problems of this type were treated by using the least-square (LS) approach. However, in many practical signal processing problems, this "soft" least-square approach is unsatisfactory because large narrow excursions from the desired shape occur so that the norm of the filter can be large and the choice of an appropriate weighting function is not obvious. Moreover, the solution can be sensitive to the detailed structure of the desired pulse, and it is usually not obvious how the shape of the desired pulse should be altered in order to improve on the solution. The "hard" EC filter formulation is more relevant than the "soft" LS approach in a variety of signal processing fields such as robust antenna and filter design, communication channel equalization, and pulse compression in radar and sonar. The distinctive feature is the set of inequality constraints on the output waveform: rather than attempting to match a specific desired pulse, we deal with a whole set of allowable outputs and seek an optimal point of that set.The EC optimal filter design problems involve a convex quadratic cost function and a number of linear inequality constraints. These EC filtering problems are classified into: discrete-time EC filtering problem, continuous-time EC filtering problem, and adaptive discrete-time EC filtering problem.The discrete-time EC filtering problem is handled using the discrete Lagrangian duality theory in combination with the space transformation function. The optimal solution of the dual problem can be computed by finding the limiting point of an ordinary differential equation given in terms of the gradient flow. Two iterative algorithms utilizing the simple structure of the gradient flow are developed via discretizing the differential equations. Their convergence properties are derived for a deterministic environment. From the primal-dual relationship, the corresponding sequence of approximate solutions to the original discrete-time EC filtering problem is obtained.The continuous-time EC filtering problem (semi-infinite convex programming problem) is handled using the continuous Lagrangian duality theory and Caratheodory's dimensionality theory. Several important properties are derived and discussed in relation to practical engineering requirements. These include the observation that the continuous-time optimal filter via orthonormal filters has the structure of a matched filter in cascade with another filter. Furthermore, the semi-infinite convex programming problem is converted into an equivalent finite dual optimization problem, which can be solved by the optimization methods developed. Another issue, which relates to the continuous-time optimal filter design problem, is the design of robust optimal EC filters. The robustness issue arises because the solution of the EC filtering problem lies on the boundary of the feasible region. Thus, any disturbance in the prescribed input signal or errors in the implementation of the optimal filter are likely to result in the output constraints being violated. A detailed formulation and a corresponding design method for improving the robustness of optimal EC filters are given.Finally, an adaptive algorithm suitable for a stochastic environment is presented. The convergence properties of the algorithm in a stochastic environment are established.
45
Tseng, Chien H. "Iterative algorithms for envelope-constrained filter design." Curtin University of Technology, Australian Telecommunications Research Institute, 1999. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10453.
Full textAbstract:
The design of envelope-constrained (EC) filters is considered for the time-domain synthesis of filters for signal processing problems. The objective is to achieve minimal noise enhancement where the shape of the filter output to a specified input signal is constrained to lie within prescribed upper and lower bounds. Traditionally, problems of this type were treated by using the least-square (LS) approach. However, in many practical signal processing problems, this "soft" least-square approach is unsatisfactory because large narrow excursions from the desired shape occur so that the norm of the filter can be large and the choice of an appropriate weighting function is not obvious. Moreover, the solution can be sensitive to the detailed structure of the desired pulse, and it is usually not obvious how the shape of the desired pulse should be altered in order to improve on the solution. The "hard" EC filter formulation is more relevant than the "soft" LS approach in a variety of signal processing fields such as robust antenna and filter design, communication channel equalization, and pulse compression in radar and sonar. The distinctive feature is the set of inequality constraints on the output waveform: rather than attempting to match a specific desired pulse, we deal with a whole set of allowable outputs and seek an optimal point of that set.The EC optimal filter design problems involve a convex quadratic cost function and a number of linear inequality constraints. These EC filtering problems are classified into: discrete-time EC filtering problem, continuous-time EC filtering problem, and adaptive discrete-time EC filtering problem.The discrete-time EC filtering problem is handled using the discrete Lagrangian duality theory in combination with the space transformation function. The optimal solution of the dual problem can be computed by finding the limiting point of ++an ordinary differential equation given in terms of the gradient flow. Two iterative algorithms utilizing the simple structure of the gradient flow are developed via discretizing the differential equations. Their convergence properties are derived for a deterministic environment. From the primal-dual relationship, the corresponding sequence of approximate solutions to the original discrete-time EC filtering problem is obtained.The continuous-time EC filtering problem (semi-infinite convex programming problem) is handled using the continuous Lagrangian duality theory and Caratheodory's dimensionality theory. Several important properties are derived and discussed in relation to practical engineering requirements. These include the observation that the continuous-time optimal filter via orthonormal filters has the structure of a matched filter in cascade with another filter. Furthermore, the semi-infinite convex programming problem is converted into an equivalent finite dual optimization problem, which can be solved by the optimization methods developed. Another issue, which relates to the continuous-time optimal filter design problem, is the design of robust optimal EC filters. The robustness issue arises because the solution of the EC filtering problem lies on the boundary of the feasible region. Thus, any disturbance in the prescribed input signal or errors in the implementation of the optimal filter are likely to result in the output constraints being violated. A detailed formulation and a corresponding design method for improving the robustness of optimal EC filters are given.Finally, an adaptive algorithm suitable for a stochastic environment is presented. The convergence properties of the algorithm in a stochastic environment are established.
46
Vojta, Aleksandar. "Protein Translocon at the Outer Envelope of Chloroplasts." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-62766.
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Varela, Mariana. "Biology of the envelope glycoproteins of sheep betaretroviruses." Thesis, Connect to e-thesis, 2008. http://theses.gla.ac.uk/117/.
Full textAbstract:
Thesis (Ph.D.) - University of Glasgow, 2008.Ph.D. thesis submitted to the Faculty of Veterinary Medicine, University of Glasgow, 2008. Includes bibliographical references. Print version also available.
48
Olliff, Derrick K. "Characterizing the failure envelope of a conductive adhesive." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19093.
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Bealle, John McComb. "The building envelope as a double-sided skin." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/23431.
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Grassitelli, Luca [Verfasser]. "Instabilities in the envelope of stars / Luca Grassitelli." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1124540288/34.
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