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1
Som, Rita. « Studies on the resistance of tea plants against Glomerella Cingulata (Stoneman) Spauld & ; ·Schrenk with Special Reference to the Involvement of Defense Enzymes ». Thesis, University of North Bengal, 2008. http://hdl.handle.net/123456789/908.
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Das, Gouri. « Studies on the Brown Blight disease of tea Camellia sinensis L. (O.) Kuntze cause by Glomerella cingulata (stoneman) Spauld. & ; Schrenk. and its interaction with phylloplane microorganisms ». Thesis, University of North Bengal, 1995. http://hdl.handle.net/123456789/1088.
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Eloy, Ygor Raphael Gomes. « Hole of hydrogen peroxide on the interaction of [Vigna unguiculata (L.) Walp] with the fungus Colletotrichum gloesporioides (Penz.) Penz. & ; Sacc. [Teleomorpho Glomerella cingulata (Stonem.) Spauld. & ; Von Schrenk] ». Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6471.
Texte intégralRésumé :
FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgicoCowpea is an important legume of the Northeast of Brazil and its yield is affected by Colletotrichum fungi. These fungi are known to occur on and cause disease anthracnose on the broad range of plants. In addition, the rapid and transient accumulation of reactive oxygen species, termed âoxidative burstâ, is one of the earliest observable reaction of plant cells to microbial infection. As plant H2O2 is believed to have direct antimicrobial effects on pathogens it was raised the hypothesis that alteration of H2O2 concentrations by pharmacological compounds could confer differences in susceptibility of the cowpea genotype BR-3-Tracuateua to C. gloeosporioides attack. Thus, seeds were germinated on humid Germitest paper and after four days seedlings were transferred to hydroponic solution. Eight days later, the primary leaves were excised, infiltrated with glucose oxidase (GO+G), salicylic acid (AS), catalase (CAT) and diphenyleneiodonium chloride (DPI) transferred to Petri dishes and inoculated with 2.0 x 105 spores mL-1 fungal suspension on the adaxial surface. After, leaves were placed in darkness and collected at 12, 24, 48 and 72 hours. By GO+G and SA leaf treatments showed 144.96 and 186.05 nmol H2O2 g-1 fresh mass (FM), respectively, and the fungus presented a subcuticular, intramural necrotrophic strategy, forming secondary hyphae associated with a quick spread and a rapid killing of the host cells. On the leaves treated with SA, it was observed lipid peroxidation and the absence of melanized appresoria. However, CAT and DPI treatment leaves presented 55.50 nmol H2O2 g-1 FM and the fungus showed hemibiotrophic infection-type, with globular vesicles and primary and secondary hyphae formation. All results suggest that despite H2O2 influenced directly the fungal infection process-type it does not confer resistance of cowpea to C. gloeosporioides.
FeijÃo-de-corda à um importante legume presente na regiÃo Nordeste do Brasil e sua produÃÃo à afetada por fungos do gÃnero Colletotrichum. Estes fungos sÃo conhecidos por causar antracnose em uma grande variedade de plantas. AlÃm disso, o acÃmulo rÃpido e transiente de espÃcies reativas de oxigÃnio, nomeado de âoxidative burstâ, à uma das primeiras reaÃÃes observÃveis em cÃlulas de plantas diante infecÃÃo microbiana. Como H2O2 produzido por plantas à considerado por apresentar efeitos antimicrobianos diretos, foi levantada a hipÃtese que alteraÃÃes nas concentraÃÃes de H2O2 por substÃncias farmacolÃgicas poderiam conferir diferenÃas na susceptibilidade do genÃtipo de feijÃo-de-corda, BR-3-Tracuateua, ao ataque do fungo C. gloeosporioides. Deste modo, sementes foram germinadas em papÃis Germistest umedecidos e, depois de 4 dias, plÃntulas foram transferidas para soluÃÃo hidropÃnica. Passados oito dias, as folhas primÃrias foram cortadas, infiltradas com glucose oxidase (GO+G), Ãcido salicÃlico (AS), catalase (CAT) e cloreto de difenilenoiodÃnio (DPI), transferidas para placas de Petri e inoculadas com suspensÃo do fungo ajustada para concentraÃÃo de 2,0 x 105 esporos mL-1. Em seguida, as folhas foram mantidas no escuro e foram coletadas em 12, 24, 48 e 72 horas. Folhas tratadas com GO+G e AS mostraram 144,96 e 186,05 nmol H2O2 g-1 de massa fresca (MF), respectivamente, e o fungo apresentou estratÃgia subcuticular, intramural necrotrÃfica, formando hifas secundÃrias associadas com Ãgil crescimento e rÃpida morte das cÃlulas hospedeiras. Nas folhas tratadas com AS, foi observada peroxidaÃÃo de lipÃdios e ausÃncia de apressÃrios melanizados. Contudo, folhas tratadas com CAT e DPI apresentaram 55,50 nmol H2O2 g-1 MF e, o fungo, mostrou modo de infecÃÃo hemibiotrÃfico, com vesÃculas globulares e formaÃÃo de hifas primÃrias e secundÃrias. Todos os resultados sugerem que, apesar do H2O2 tenha influenciado diretamente o modo de infecÃÃo do fungo, este nÃo conferiu resistÃncia no feijÃo-de-corda ao C. gloeosporioides.
4
Eloy, Ygor Raphael Gomes. « Papel do peróxido de hdrogênio na interação do feijão-de-corda [Vigna unguiculata (L.) Walp] com o fungo Colletotrichum gloesporioides (Penz.) Penz. & ; Sacc. [Teleomorfo Glomerella cingulata (Stonem.) Spauld. & ; Von Schrenk] ». reponame:Repositório Institucional da UFC, 2007. http://www.repositorio.ufc.br/handle/riufc/18868.
Texte intégralRésumé :
ELOY, Ygor Raphael Gomes. Papel do peróxido de hdrogênio na interação do feijão-de-corda [Vigna unguiculata (L.) Walp] com o fungo Colletotrichum gloesporioides (Penz.) Penz. & Sacc. [Teleomorfo Glomerella cingulata (Stonem.) Spauld. & Von Schrenk]. 2007. 158 f. Dissertação (Mestrado em Bioquímica) - Universidade Federal do Ceará, Fortaleza-CE, 2007.Submitted by Eric Santiago (erichhcl@gmail.com) on 2016-07-19T11:58:23Z No. of bitstreams: 1 2007_dis_yrgelooy.pdf: 1787072 bytes, checksum: bcc6cf1a3dc36c9e16fb8e0e1485b9e0 (MD5)
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Made available in DSpace on 2016-08-02T20:27:21Z (GMT). No. of bitstreams: 1 2007_dis_yrgelooy.pdf: 1787072 bytes, checksum: bcc6cf1a3dc36c9e16fb8e0e1485b9e0 (MD5) Previous issue date: 2007
Cowpea is an important legume of the Northeast of Brazil and its yield is affected by Colletotrichum fungi. These fungi are known to occur on and cause disease anthracnose on the broad range of plants. In addition, the rapid and transient accumulation of reactive oxygen species, termed ‘oxidative burst’, is one of the earliest observable reaction of plant cells to microbial infection. As plant H2O2 is believed to have direct antimicrobial effects on pathogens it was raised the hypothesis that alteration of H2O2 concentrations by pharmacological compounds could confer differences in susceptibility of the cowpea genotype BR-3-Tracuateua to C. gloeosporioides attack. Thus, seeds were germinated on humid Germitest® paper and after four days seedlings were transferred to hydroponic solution. Eight days later, the primary leaves were excised, infiltrated with glucose oxidase (GO+G), salicylic acid (AS), catalase (CAT) and diphenyleneiodonium chloride (DPI) transferred to Petri dishes and inoculated with 2.0 x 105 spores mL-1 fungal suspension on the adaxial surface. After, leaves were placed in darkness and collected at 12, 24, 48 and 72 hours. By GO+G and SA leaf treatments showed 144.96 and 186.05 nmol H2O2 g-1 fresh mass (FM), respectively, and the fungus presented a subcuticular, intramural necrotrophic strategy, forming secondary hyphae associated with a quick spread and a rapid killing of the host cells. On the leaves treated with SA, it was observed lipid peroxidation and the absence of melanized appresoria. However, CAT and DPI treatment leaves presented 55.50 nmol H2O2 g-1 FM and the fungus showed hemibiotrophic infection-type, with globular vesicles and primary and secondary hyphae formation. All results suggest that despite H2O2 influenced directly the fungal infection process-type it does not confer resistance of cowpea to C. gloeosporioides.
Feijão-de-corda é um importante legume presente na região Nordeste do Brasil e sua produção é afetada por fungos do gênero Colletotrichum. Estes fungos são conhecidos por causar antracnose em uma grande variedade de plantas. Além disso, o acúmulo rápido e transiente de espécies reativas de oxigênio, nomeado de ‘oxidative burst’, é uma das primeiras reações observáveis em células de plantas diante infecção microbiana. Como H2O2 produzido por plantas é considerado por apresentar efeitos antimicrobianos diretos, foi levantada a hipótese que alterações nas concentrações de H2O2 por substâncias farmacológicas poderiam conferir diferenças na susceptibilidade do genótipo de feijão-de-corda, BR-3-Tracuateua, ao ataque do fungo C. gloeosporioides. Deste modo, sementes foram germinadas em papéis Germistest® umedecidos e, depois de 4 dias, plântulas foram transferidas para solução hidropônica. Passados oito dias, as folhas primárias foram cortadas, infiltradas com glucose oxidase (GO+G), ácido salicílico (AS), catalase (CAT) e cloreto de difenilenoiodônio (DPI), transferidas para placas de Petri e inoculadas com suspensão do fungo ajustada para concentração de 2,0 x 105 esporos mL-1. Em seguida, as folhas foram mantidas no escuro e foram coletadas em 12, 24, 48 e 72 horas. Folhas tratadas com GO+G e AS mostraram 144,96 e 186,05 nmol H2O2 g-1 de massa fresca (MF), respectivamente, e o fungo apresentou estratégia subcuticular, intramural necrotrófica, formando hifas secundárias associadas com ágil crescimento e rápida morte das células hospedeiras. Nas folhas tratadas com AS, foi observada peroxidação de lipídios e ausência de apressórios melanizados. Contudo, folhas tratadas com CAT e DPI apresentaram 55,50 nmol H2O2 g-1 MF e, o fungo, mostrou modo de infecção hemibiotrófico, com vesículas globulares e formação de hifas primárias e secundárias. Todos os resultados sugerem que, apesar do H2O2 tenha influenciado diretamente o modo de infecção do fungo, este não conferiu resistência no feijão-de-corda ao C. gloeosporioides.
5
Friedman, Peter C. « Spared the Technicolor ». ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2073.
Texte intégral
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Požela, Juras. « Partinė spauda Lietuvos politinėje komunikacijoje ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20110709_151350-85106.
Texte intégralRésumé :
Magistro darbo objektas – partinė spauda Lietuvos politinėje komunikacijoje. Darbo tikslas – išsiaiškinti partinės spaudos tendencijas politinėje komunikacijoje, atsakyti į klausimą kodėl jos atsisakoma ir kokios atsiranda alternatyvos. Pagrindiniai darbo uždaviniai – politinės komunikacijos vystymosi tendencijas, politinės komunikacijos sąveiką, išnagrinėti politinio dalyvavimo savivaldoje ypatumus. Iškelto tikslo buvo siekiama analizuojant politinės komunikacijos teorinį istorinį kontekstą, vystymosi tendencijas, nagrinėjant politikos sampratą Lietuvoje ir partinę spaudą, jos kitimą. Pirmoje magistro darbo dalyje nagrinėjau politinės komunikacijos teorinę dalį, žiniasklaidos, kaip politinės komunikacijos tarpininko tarp valdžios ir visuomenės, vaidmenį. Antroje darbo dalyje nagrinėju politikos ir politinių partijų specifiką. Didelis dėmesys skiriamas XX amžiaus pradžios Lietuvos partinei žiniasklaidai. Trečioje darbo dalyje buvo atliktas tyrimas, kuriuo buvo siekiama išsiaiškinti partijų požiūris į partinę spaudą. Rašant darbą buvo naudoti tyrimo metodai: - teorinėje darbo dalyje naudotas literatūros analizės ir sintezės metodas; - praktinėje darbo dalyje naudotas ekspertų apklausos metodas. Darbas gali būti įdomus ir naudingas žiniasklaidos priemonėms, politinėms partijoms, taip pat studentams, besidomintiems politine komunikacija, partine spauda ir viešosios informavimo priemonių vaidmeniu.Nowadays information and communication technologies plays an increasingly role in all the fields of the life. This concerns changes in the systems of mass media and political communication as well. The main role in political communication belongs to the mass media so for this reason it is very important to analyse its impact and transformations. In my master thesis I am exploring political press in Lithuanian political communication. Usually political communication is analysed as application of political marketing and political advertising during political campaigns. Objective of the diploma thesis is political press in Lithuanian political communication. The aim of the work is to detect tendencies of evolution of the political communication and party press, its impact to political daily agenda, peciuliarity of political participation in the governance. I reached the aim of the work by analysing theoretical and historical context of the political communication and political press, tendencies of evolution, role of the mass media in formulating opinion for publics. In the first part of the thesis I analysed theory of the political communication, roles of the mass media as the mediator of communication between the government and society. The second part of the thesis is dedicated to specify the role of the political parties in the structure of governance, its specifics. As well as to answer how it influences every day life of the society. Big part of the second part of the... [to full text]
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Tamaliūnaitė, Ingrida. « Paslaugų kokybės valdymas. UAB „SPAUSK“ atvejis ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130205_161049-79994.
Texte intégralRésumé :
Šiuolaikinėmis ypatingai didelės konkurencijos sąlygomis, kai rinka persotinta prekių ir paslaugų, daugelis įprastinių konkurencinių strategijų praranda savo poveikį, vis daugiau įmonių pradeda spręsti paslaugų kokybės užtikrinimo klausimą. Paslaugų sektoriuje labiausiai kreiptinas dėmesys yra į kokybišką aptarnavimą, nes tai didelia dalimi nulemia vartotojo apsisprendimą pasinaudoti ar ne teikiamomis paslaugomis. Didelis vartotojų pasitenkinimo lygis nulemia didesnį vartojimą.In case of highly competitive market saturated of products and services, usual marketing strategies lose their efficiency. Companies reaction is implementing a new strategy based on solving the issues related to the “warranty’ service quality”. It is essential in the service sector to focus guaranteeing high standarts of services, which is to a large extend determinated by the user’s wish whether or not to benefit of these services. A high level of customer’s satisfaction usualy leads to higher consumption.
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Groves, G. W. « Scheduling evenly spaced routes in networks ». Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/16055.
Texte intégral
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Hägglöf, Christina. « Spaced learning i naturkunskapsundervisning på gymnasieskolan ». Thesis, Linnéuniversitetet, Institutionen för utbildningsvetenskap (UV), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-49674.
Texte intégralRésumé :
Man har sedan länge förstått att lärande gynnas repetition och pauser däremellan, menvarför detta har en positiv effekt på långtidsminnet har varit okänt. Försök på råttor harvisat att repetition är viktigt för att förstärka kommunikationen vid synapser som ärviktiga för minnesbildning och att pauser är nödvändiga för att de proteiner som stärkersynapsen ska hinna bildas och verka.Med stöd i detta har man utvecklat en undervisningsteknik som kallas spaced learning,där undervisningsmaterialet presenteras tre gånger, separerat av pauser inkluderande enorelaterad aktivitet. Studier där denna teknik har testats på elever har visat att teknikenhar god effekt på elevernas kunskap, utvärderat med flervalsfrågor, jämfört medkontrollgruppens undervisning och att tekniken lämpar sig väl för att sammanfatta faktaefter en kurs inför prov.Eftersom metoden är relativt ny är mängden och fullständigheten av insamlade data omspaced learnings effekt begränsad. De resultat som finns baseras framförallt påhögstadieelever i England och utvärderingen grundar sig på flervalsfrågor, vilket gör detsvårt att mäta analytiska förmågor.Den mindre studie som presenteras i detta arbete skiljer sig från tidigare studier genomatt eleverna är äldre. I försöket analyseras gymnasieelever till skillnad frånhögstadieelever vilket endast undersökts tidigare i en mindre svensk studie. Ingen av detidigare studierna har heller använt samma undervisande lärare och samma elever, vilketeventuellt kan påverka resultatet. Studien syftar också även till att mäta mer analytiskaförmågor hos eleverna genom att efterfråga förklaringar och motiveringar iprovfrågorna.Resultaten från denna mindre studie antyder att spaced learning ökar elevernaskunskaper, både angående enkla faktakunskaper och mer analyserande kunskaper, påkort sikt. När längre tid har passerat så tycks den procentuella minskningen avprovresultaten vara lika stor oavsett om spaced learning eller traditionell undervisninghar används. Spaced learning fungerade väl i klassrummet och de elever som uttalade sigom metoden uppskattade upplägget.
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Roy, Pulakesh. « Fractionally Spaced Blind Equalizer Performance Improvement ». Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31048.
Texte intégralRésumé :
Blind equalization schemes are used to cancel the effects of a channel on the received signal when the transmission of a training sequence in a predefined time slot is not possible. In the absence of a training sequence, blind equalization schemes can also increase the throughput of the overall system. A general problem with blind adaptation techniques is that they have poor convergence properties compared to the traditional techniques using training sequences. Having a multi-modal cost surface, blind adaptation techniques may force the equalizer to converge to a false minimum, depending on the initialization. The most commonly used blind adaptation algorithm is the Constant Modulus Algorithm (CMA). It is shown by simulation that a logarithmic error equation can make CMA converge to a global minimum, if a differential encoding scheme is used. The performance of CMA with different error equations is also investigated for different channel conditions.
For a time varying channel, the performance of an equalizer not only depends on the convergence behavior but also on the tracking property, which indicates the ability of an equalizer to track changes in the channel. The tracking property of a blind equalizer with CMA has been investigated under different channel conditions. It is also shown that the tracking property of a blind equalizer can be improved by using a recursive linear predictor at the output of the equalizer to predict the amplitude of the equalizer output. The predicted value of the amplitude is then used to adjust the instantaneous gain of the overall system.
A recursive linear predictor is designed to predict a colored signal without having a priori knowledge about the correlation function of the input sequence. The performance of the designed predictor is also investigated by predicting the envelope of a flat fading channel under constant mobile velocity and constant acceleration conditions.Master of Science
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Lang, Judy Brenda. « The growth characteristics of sparid otoliths ». Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005129.
Texte intégralRésumé :
The periodicity of formation of growth increments in the otoliths of South African sparids was validated by the oxytetracycline labelling technique. Intramuscular injections of oxytetracycline at a dosage of 250mg/kg marked the otoliths of laboratory held juvenile sparids, while a dosage range of 50 - 100mg/kg oxytetracycline, injected intramuscularly, marked adult sparids in the field. Laboratory held, larval sparid otoliths were marked by immersion for 24hrs a solution of 100-150mg/l alizarin complexone. Both daily (microstructural) and annual (macrostructural) growth increments were identified in the otoliths. The micro incremental pattern of deposition in the sparid otoliths conformed to the general pattern of otolith structure. Sparid otoliths consisted of a central opaque nucleus composed of multiple primordia. surrounding this nucleus were daily increments which decreased in width as the distance from the nucleus increased. Both check rings and subdaily increments were visible throughout the otolith. Minor environmental changes did not affect micro incremental deposition. Narrow opaque and wide hyaline annual growth zones were identified in sectioned sparid otoliths. Scanning electron microscope analysis of the annual growth zones revealed that microincrements within the opaque zone were narrowly spaced with prominent discontinuous phases. This resulted in the greater optical density and higher protein content of the zone. The hyaline zone was composed of widely spaced daily increments with prominent incremental phases accounting for the translucent nature of this zone. Opaque zone formation in the otoliths of many South African sparids was found to occur primarily during periods of reproductive activity and was shown to be indicative of slow otolith growth. The hyaline zone was formed after the spawning season, representative of fast otolith growth. The results of this study have resolved much of the controversy surrounding the rate of growth and time of formation of the opaque and hyaline growth zones in South African sparid otoliths.
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Menfi, Giuseppe. « Revisione meccanica dell'articolazione di spalla PROMAS 6 ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15670/.
Texte intégralRésumé :
In questo elaborato è descritta l’attività, svolta presso l’Area Ricerca e Formazione del Centro Protesi INAIL, di revisione meccanica dell’articolazione protesica di spalla PROMAS-6. Questo lavoro si inserisce all’interno di un progetto di ricerca più ampio, in collaborazione con il campus Bio-medico di Roma, per la realizzazione di una protesi di arto superiore per disarticolazione di spalla. Il progetto di tesi nasce dalla necessità di sostituire l’attuale gruppo di motoriduzione della spalla con una versione che presenti un sistema di irreversibilità, in modo da poter ridefinire il design della spalla medesima, alleggerendone il peso e ricavando lo spazio necessario per l’alloggiamento di una batteria e della scheda elettronica. Sono stati realizzati due prototipi del motoriduttore: uno contenente un NBDM (Non-Back-Drivible-System) ed una versione alternativa nella quale è stato utilizzato un riduttore cicloidale in sostituzione dello stadio di riduzione presente nella versione originale. Per la progettazione dei prototipi è stato utilizzato il software CAD Autodesk Inventor Professional, il quale consente di progettare, visualizzare e simulare una rappresentazione digitale del prodotto finale. I componenti dei motoriduttori sono stati realizzati con stampante 3D in modo da verificarne l’efficacia e poter confrontarne, preliminarmente, le prestazioni. Successivamente, sulla base dei disegni tecnici tradizionali sono stati fabbricati, presso un’officina meccanica specializzata, i componenti necessari per la realizzazione del prototipo contenente l’NBDM. Infine, la nuova versione del motoriduttore è stata comparata con quella esistente priva del freno servendosi di un banco prova per articolazioni protesiche attive sviluppato all’interno del Centro Protesi.
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Shorter, Nicholas. « HEURISTIC 3D RECONSTRUCTION OF IRREGULAR SPACED LIDAR ». Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3201.
Texte intégralRésumé :
As more data sources have become abundantly available, an increased interest in 3D reconstruction has emerged in the image processing academic community. Applications for 3D reconstruction of urban and residential buildings consist of urban planning, network planning for mobile communication, tourism information systems, spatial analysis of air pollution and noise nuisance, microclimate investigations, and Geographical Information Systems (GISs). Previous, classical, 3D reconstruction algorithms solely utilized aerial photography. With the advent of LIDAR systems, current algorithms explore using captured LIDAR data as an additional feasible source of information for 3D reconstruction. Preprocessing techniques are proposed for the development of an autonomous 3D Reconstruction algorithm. The algorithm is designed for autonomously deriving three dimensional models of urban and residential buildings from raw LIDAR data. First, a greedy insertion triangulation algorithm, modified with a proposed noise filtering technique, triangulates the raw LIDAR data. The normal vectors of those triangles are then passed to an unsupervised clustering algorithm – Fuzzy Simplified Adaptive Resonance Theory (Fuzzy SART). Fuzzy SART returns a rough grouping of coplanar triangles. A proposed multiple regression algorithm then further refines the coplanar grouping by further removing outliers and deriving an improved planar segmentation of the raw LIDAR data. Finally, further refinement is achieved by calculating the intersection of the best fit roof planes and moving nearby points close to that intersection to exist at the intersection, resulting in straight roof ridges. The end result of the aforementioned techniques culminates in a well defined model approximating the considered building depicted by the LIDAR data.M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Song, Sanquan 1980. « Fractionally spaced equalization for high-speed links ». Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/64588.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 115-119).
As high-speed links enter the multi-Gb/s era, equalization and clock recovery designs become much more challenging. For conventional links, these two loops are separate with different performance metrics, resulting in sub-optimal performance. Fractionally spaced equalization (FSE) inherently unifies these two functions, and therefore is proposed for joint equalization and synchronization in this thesis. At the system level, this thesis introduces new adaptation techniques for both mesochronous and plesiochronous applications. For mesochronous systems, the divergence issue of the low-cost sign-sign least-mean-square (SSLMS) adaptive algorithm is solved by using update conditioning to effectively increase the quantization resolution. For plesiochronous systems, a digitally-controlled bit-skipping scheme is proposed for frequency offset compensation. At the circuit level, the voltage-time conversion technique is redesigned to build highspeed, linear and energy-efficient FSE filter taps, which are scalable to advanced technology nodes. All the information is processed by linear current integration, with all integrated currents independent of the channel voltages, avoiding the non-linear voltage-current transformation. Based on different voltage-to-time converter designs, two proof-of-concept FSE implementations have been fabricated in a 90-nm CMOS process. The first implementation is a 2-way interleaved 2-tap FSE, operating at 4.0 Gb/s, with 2.0 pJ/bit energy-efficiency and 4.3 bits of linearity, showing immunity to the sampling phase. Operating at higher rates (6.25 Gb/s), the second implementation is designed as a 4-way interleaved 2-tap FSE with a 1-tap DFE, which achieves 3.6 pJ/bit energy-efficiency and over 4.0 bits of linearity, demonstrating the convergence of the modified sign-sign least-mean-square (M-SSLMS) algorithm. A third implementation has been designed with on-chip coefficient adaptation loop and bit-skipping scheme for plesiochronous systems.
by Sanquan Song.
Ph.D.
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Kovac, Arne. « Wavelet thresholding for unequally time-spaced data ». Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/2088715a-7792-4032-bb76-83e3b0389b94.
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ZHANG, SHIQIAO. « THE ANALYSIS OF UNEQUALLY SPACED TIME SERIES ». University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1172507478.
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Johnston, Wesley James. « Nonlinear optics in Bragg-spaced quantum wells ». Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/826.
Texte intégralRésumé :
Bragg spaced quantum wells represent a unique class of resonant photonic materials, wherein a photonic bandgap is created by the periodic spacing of quantum wells and the associated variation in the complex susceptibility (index and absorption) of the material. Interest in BSQWs has grown in the past decade due to their large ultrafast nonlinearities and the corresponding large ultrafast reflectivity changes and transmissivity. These nonlinearities are of particular interest in areas of communication technology, where ultrafast all-optical logic components have become increasingly in demand. This research will further investigate BSQWs and the for the first time effects of spin-dependent nonlinear excitation on their photonic band structures. It will also investigate how these effects can be used in all-optical polarization switching and tunable optical buffer (slow light) applications.
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Johansson, Boel, et Marie Karlsson. « Beslutstödssystem för trafikplanering : från sparad tid till framtid ». Thesis, University West, Department of Economics and Informatics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-499.
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Robeson, Isaac J. « A departure regulator for closely spaced parallel runways ». Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42783.
Texte intégralRésumé :
Increased efficiency at airports is necessary to reduce delays and fuel consumption. Many of the busiest airports in the nation have at least one pair of closely spaced parallel runways (CSPRs), defined by a separation of less than 2500 ft, with one runway dedicated to arrivals and the other to departures. CSPRs experience a large decrease in capacity under instrument conditions because they can no longer operate independently. In order to mitigate this decrease in capacity and to increase efficiency, proposed herein is a departure regulator for runways so configured, along with a plan of study to investigate the effects of this regulator.
The proposed departure regulator makes use of data from precision tracking systems such as ADS-B to issue automated or semi-automated departure clearances. Assuming sequential departure separations are sufficient for clearance, the regulator will automatically issue, or advise the controller to issue, the departure clearance as soon as the arrival on the adjacent runway has descended below its decision height. By issuing the departure clearance earlier, the departure regulator reduces the gap between a pair of arrivals that is required to clear a departure. By decreasing the gap, the regulator increases the number of opportunities where a departure clearance can be issued, given a particular arrival stream.
A simulation models the effects of the regulator and quantifies the resulting increases in capacity. The simulation results indicate that all forms of the regulator would provide significant gains of between 14% and 23% in capacity over the current operating paradigm. The results also indicate that the capacity gains are greatest at high arrival rates. Therefore, implementation of the departure regulator could significantly decrease the congestion at many major airports during inclement weather.
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Životkevičiūtė, Violeta. « Vilniaus periodinė spauda ir visuomenė 1797 - 1832 metais ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050610_143651-35737.
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The Vilnius press at the beginning of the 19th century was made of four types of news media: political and satirical newspapers, scientific and cultural journals. Each type of news media had specific kind of information. Political newspapers informed about political and military events of Russia Empire and foreign countries. News from Lithuania was rare and considered mostly Vilnius city. Scientific news media was made of three type’s journals: 1) propagated different kind of sciences. This type of scientific journal aimed to propagate science not only for clerisy, but for wider reader’s auditory; 2) informed about scientific work of Vilnius and foreign universities; 3) journals set for medicine. There were two satirical newspapers in Vilnius. Their main aim was to criticize the faulty way of life of nobility and officers. Cultural news media published fiction, history article, informed about cultural life of Vilnius and charity.
The educated society wished to have tribune to propagate their ideas. That was the main reason for establishing new kinds of news media. And that is why Vilnius press allows knowing valuables of educated society of Lithuania. It is one of the main sources to know what kind of man’s life was standard. It is also the main source to know the forms of cultural life of Vilnius. But the goals of publishers did not check out with the goals of readers. That is one of the reasons why the Vilnius press had small number of readers. The others reasons were small... [to full text]
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Nayfeh, Samir Ali. « Nonlinear dynamics of systems involving widely spaced frequencies ». Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040426/.
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Žiemys, Robertas. « Edukologinių problemų aptartis 1918-1940 m. Lietuvos pedagoginėje spaudoje ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20140626_192955-88969.
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1918 - 1940 m. Lietuvos pedagoginė spauda vykdė komunikacinę funkciją švietimo srityje, informavo skaitytojus apie visas pedagoginiame pasaulyje vykstančias problemas ir naujienas, stengėsi reaguoti į visus mokyklą, mokytojus ir mokinius liečiančius einamojo momento klausimus. Nagrinėjamo laikotarpio Lietuvos pedagoginė spauda gali būti ir vienas pagrindinių šaltinių, analizuojant ugdymo mokslo brandą Lietuvoje. Darbo tikslas – išanalizuoti pedagoginės minties sklaidą 1918 - 1940 m. Lietuvos pedagoginėje spaudoje. Uždavinai: 1. Aptarti Lietuvos pedagoginės spaudos atsiradimo aplinkybes; 2. Išnagrinėti pagrindines 1918 - 1940 m. Lietuvos pedagoginėje spaudoje gvildentas ugdymo problemas. Metodas istorinis chronologinis – skirtas 1918-1940 metų edukacinės spaudos raidos ir savitumo analizei Bibliografiniai tyrimai leido išsiaiškinti nagrinėjamo laikotarpio pedagoginės raštijos autorius ir jų darbus, susipažinti su jų straipsniais ir nustatyti darbų vertingumą ugdymo mokslui. Nagrinėjamų straipsnių analizė baigiama ieškant bendrybių. Tam buvo naudojamas apibendrinimo metodas. Šiuo darbu nebuvo siekiama aprėpti visų ugdymo mokslo veikėjų ir jų straipsnių, bet pasirinkti ryškiausi atstovai, rašę įvairiais pedagogikos klausimais cituojami tarpukario laikotarpio pedagoginėje spaudoje, taip pat nagrinėjamu laikotarpiu į ugdymo mokslą įnešę kažką naujo. Cituojamais šaltiniais siekiama atskleisti bei išryškinti ugdymo mokslo problematiką ir ją aptarti. Analizuojant minimo laikotarpio... [toliau žr. visą tekstą]In 1918-1940 in the field of education the communicative function was being carried by the pedagogical press of Lithuania, readers were informed about the problems and news in pedagogy, in addition, there was a try to react to all the current affairs related to schools, teachers and students. Analysing the maturity of educational science in Lithuania during the consideration period, the pedagogical press of Lithuania may be considered as one of the main sources. The aim of this work is to analize the spread of pedagogical thought in the pedagogical press of Lithuania in the period of 1918-1940. Goals: 1. To discuss the circumstances of the origin of the pedagogical press in Lithuania. 2. To analyse the main educational problems examined in the pedagogical press of Lithuania of 1918-1940. Historical-chronological method was applied to analyse the development and the distinction of the educational press of 1918-1940. Bibliographical researches revealed the authors and their works on pedagogy of the analysed period, to survey their articles, and to assess the worth of their works to educational science. The analysis of articles is concluded by the search of commonalities. For this purpose, the method of generalization was applied. There was no aim to cover all the persona of educational science and their articles, but the most distinct representatives, who wrote on pedagogical topics and were quoted in the pedagogical press of the interwar period, and ones who brought... [to full text]
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Brašiškienė, Deimantė. « Tarpukario spaudos Šiauliuose raida : „Momentas“, „Mūsų momentas“, „Įdomus mūsų momentas“ ». Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100903_125442-24106.
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Tarpukariu (1918–1940 m.) Lietuvos vyriausybė labai pradėjo rūpintis kultūra ir švietimu, o tai lėmė periodinės spaudos suklestėjimą, ypač laikraščių ir savaitraščių. 1928–1940 m. Šiauliuose buvo leidžiami bulvarinio pobūdžio savaitraščiai „Momentas“ (1928–1930), kurio vyriausiasis redaktorius buvo Jurgis Janulaitis, „Mūsų momentas“ (1930–1933) ir „Įdomus mūsų momentas“ (1933–1940), kurių vyriausiasis redaktorius buvo Bronius Buišas. Šie leidiniai ir yra darbo tyrimo objektas. Savaitraščiai buvo tiriami naudojant aprašymo, interpretacinį ir lyginamąjį metodus. Ištirti šie minėtų leidinių numeriai: „Momento“ (1928 m. 1–25; 1929 m. 1, 3–7, 13, 29, 41, 43; 1930 m. 1numeriai), „Mūsų momento“ (1930 m. 1–25, 35; 1932 m. 42–51 numeriai), „Įdomaus mūsų momento“ (1933 m. 9, 16, 25–30; 1934 m. 3–13, 42, 43, 51; 1935 m. 2, 16; 1936 m. 15, 28; 1937 m. 35; 1938 m. 5, 29; 1939 m. 41; 1940 m. 1 numeriai).
Tai buvo bulvarinės spaudos periodiniai leidiniai, kuriuose daugiausia vietos užėmė kriminalų, aferų, sensacijų, žymių žmonių asmeninio gyvenimo aprašymai. Taip pat savaitraščiuose publikuota straipsnių apie svarbesnius Lietuvos ir pasaulio kultūrinius įvykius ir renginius.
Savaitraščiai „Momentas“, „Mūsų momentas“, „Įdomus mūsų momentas“ turėjo nuolatines rubrikas, kuriose buvo spausdinama panašaus turinio informacija. „Momentas“ turėjo šias rubrikas: „Kronika“, „Juokų“ skiltis, „Įvairenybės“, „Gyvenamųjų dienų apžvalga“. „Mūsų momente“ publikuotos rubrikos: „Juokų“ skiltis, „Sportas“... [toliau žr. visą tekstą]Between the wars (1918–1940) Lithuanian Government was taking more care of culture and education, which led to periodical prospering, especially of newspapers and weekly. In 1928–1940 gutter weekly “Momentas” (1928–1930), chief editor Jurgis Janulaitis, “Mūsų momentas” (1930–1933) and “Įdomus mūsų momentas” (1933–1940) chief editor Bronius Buišas were published. These publications are subject of this paper. The weekly were analysed using description, interpretation and comparative methods. Listed issues were analysed. They were gutter periodicals, where most place was taken by criminal news, affair, sensation, famous people personal life descriptions. They also publicised articles about significant Lithuanian and world cultural events. The weekly “Momentas”, “Mūsų momentas”, “Įdomus mūsų momentas” had permanent columns with similar information. “Momentas”: Chronicle, Jokes, Various, Review of living days, “Mūsų momentas”: Jokes, Sports, “Įdomus mūsų momentas” included new columns Here and abroad, For free hour, Our scout corner, News for women. The weekly were regional periodicals: most articles were about Šiauliai city and regional events, actualities, news. Readers also were offered news from Lithuania and the world, but not so abundantly. Gutter weekly “Momentas”, “Mūsų momentas”, “Įdomus mūsų momentas” publicized literal creations as well. Mostly it was popular beletristics: satires (Cingu-Lingas “Ko trūksta Šiauliams”), sentimental low artistic level poems, criminal... [to full text]
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Haider, Waheed, et haiderw@connellhatch com. « INPLANE RESPONSE OF WIDE SPACED REINFORCED MASONRY SHEAR WALLS ». Central Queensland University. Centre for Railway Engineering, 2007. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20070421.130337.
Texte intégralRésumé :
Wide spaced reinforced masonry (WSRM) walls that contain vertical reinforced cores at horizontal spacing up to 2000mm are commonly used in high wind zones of Australia although their inplane shear resistance is not well understood. This thesis aims at providing better insight into the behaviour of WSRM walls subjected to inplane lateral loading through experimental and numerical investigations.
The interactions between the unreinforced masonry (URM) panels and vertical reinforced cores are first determined using an elastic finite element analysis and the potential failure paths hypothesized. The hypotheses are then validated using a series of full-scale WSRM and Non-WSRM wall tests under monotonic and cyclic lateral loading by keeping the spacing between the vertical reinforced cores as the main design variable. Load-displacement response of these shear walls indicates that the current classification of the WSRM in AS3700 (2001) as those walls containing vertical reinforced grouted cores at 2000mm maximum spacing is appropriate.
A finite element model (FEM) based on an explicit solution algorithm is developed for predicting the response of the masonry shear walls tested under static loading. The FEM has adopted macroscopic masonry failure criteria and flow rules, damaged plasticity model for grout and tension-only model for reinforcing bars reported in the literature, and predicted crack opening and post-peak load behaviour of the shear walls. By minimising the kinetic energy using appropriate time scaling, the FEM has provided reasonable and efficient prediction of load flow, crack patterns and loaddisplacement curves of the shear walls. The FEM is further validated using full-scale tests on WSRM walls of aspect ratios and pre-compression different to that tested before.
The validated FEM is used to examine the appropriateness of the prescriptive design details for WSRM concrete masonry shear walls provided in AS3700 (2001) allowing for a large scatter in material properties. It is shown that the inplane shear capacity formula provided in AS3700 (2001) for squat WSRM shear walls is non-conservative.
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Skowratananont, K. « Adaptive algorithms for blind equalisation of fractionally spaced channels ». Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325352.
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Rostron, James P. « Electron and energy transfer in closely-spaced molecular dyads ». Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423720.
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Liu, Xiangwei 1976. « Spectrum of some regular graphs with widely spaced modifications ». Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8224.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2001.Includes bibliographical references (p. 71-72).
This thesis has two parts. The first part studies the spectrum of a family of growing trees, we show that the eigenvalues of the adjacency matrix and Laplacian matrix have high multiplicities. As the trees grow, the graphs of those eigenvalues approach a piecewise-constant "Cantor function", which is different from the corresponding properties of the infinite tree. The second part studies the effect of "widely spaced" modifications on the spectrum of some type of structured matrices. We show that by applying those modifications, new eigenvectors that are localized near the components that correspond to the modified rows appear. By knowing the approximate form of those eigenvectors, we also determine a very close (and simple) approximation to the eigenvalues, and then we show that this approximation is indeed the limit as the matrix grows.
by Xiangwei Liu.
Ph.D.
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Vines, Roger. « MISSILE ANTENNA PATTERNS FOR WIDELY-SPACED MULTI-ELEMENT ARRAYS ». International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605040.
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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, NevadaMultiple discrete antennas distributed around the circumference of a large missile and driven by one transmitter are sometimes used to radiate telemetry omnidirectionally. But driving discrete antennas separated by several wavelengths around the missile body with a single transmitter can result in an antenna pattern with deep nulls in the roll plane. Varying the relative signal phase or amplitude among the signals driving the antennas as well as the polarization of the antennas can be used to change the nulls in an attempt to decrease the null depth. In this paper the effects of phase, amplitude, and polarization on the roll-plane pattern are examined and measurement data presented.
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Liang, Hong. « Adaptive Fourier Analysis For Unequally-Spaced Time Series Data ». Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27722.
Texte intégralRésumé :
Fourier analysis, Walsh-Fourier analysis, and wavelet analysis have often been used in time series analysis. Fourier analysis can be used to detect periodic components that have sinusoidal shape; however, it might be misleading when the periodic components are not sinusoidal. Walsh-Fourier analysis is suitable for revealing the rectangular trends of time series. The flaw of the Walsh-Fourier analysis is that Walsh functions are not periodic. The resulting Walsh-Fourier analysis is more difficult to interpret than classical Fourier analysis. Wavelet analysis is very useful in analyzing and describing time series with gradual frequency changes. Wavelet analysis also has a shortcoming by giving no exact meaning to the concept of frequency because wavelets are not periodic functions. In addition, all three analysis methods above require equally-spaced time series observations.
In this dissertation, by using a sequence of periodic step functions, a new analysis method, adaptive Fourier analysis, and its theory are developed. These can be applied to time series data where patterns may take general periodic shapes that include sinusoids as special cases. Most importantly, the resulting adaptive Fourier analysis does not require equally-spaced time series observations.Ph. D.
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Baggett, Benjamin Matthew Wall. « Optimization of Aperiodically Spaced Antenna Arrays for Wideband Applications ». Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32532.
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Over the years, phased array antennas have provided electronic scanning with high gain and low sidelobe levels for many radar and satellite applications. The need for higher bandwidth as well as greater scanning ability has led to research in the area of aperiodically spaced antenna arrays. Aperiodic arrays use variable spacing between antenna elements and generally require fewer elements than periodically spaced arrays to achieve similar far field pattern performance. This reduction in elements allows the array to be built at much lower cost than traditional phased arrays.
This thesis introduces the concept of aperiodic phased arrays and their design via optimization algorithms, specifically Particle Swarm Optimization. An axial mode helix is designed as the antenna array element to obtain the required half power beamwidth and bandwidth. The final optimized aperiodic array is compared to a traditional periodic array and conclusions are made.Master of Science
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Roy, Bimal Chandra. « Compression of equally spaced digital elevation model (DEM) data / ». The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487335992902427.
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Skon, Luke C. « Expanding De Novo Repeat Search to Multiple Spaced Seeds ». Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1527860222418868.
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Ramalingam, Madhan Raj. « Cadmium zinc telluride solar cells by close spaced sublimation ». [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000408.
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Emery, Rebecca Brinck. « Spaced Versus Massed Practice in L2 German Listening Comprehension ». BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6295.
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Students often have a difficult time understanding native speakers of their target language. This thesis examines two theories that may help students better understand NSs: spaced versus massed practice and the use of technology to enhance input. The study had the students of four sections of German 101 at BYU, divided into a spaced practice group that watched authentic German videos five minutes a day, six days a week for seven weeks and a massed practice group that watched authentic German videos for half an hour, one day a week for seven weeks, then gave them an immediate and a delayed listening comprehension posttest to see which improved more, along with several surveys to learn more about extraneous variables and the student experience with the activity. The results showed no significant difference between the two groups, but this is likely due to the many limitations of the study. The two biggest limitations were that of the 75 potential participants, only 13 allowed for their information to be used and had usable information, and that all of those 13 participants did too well on both posttests to be able to differentiate between them, so no conclusions were able to be drawn from this study.
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Tsai, Liren. « SHOCK WAVE STRUCTURE AND SPALL STRENGTH OF LAYERED HETEROGENEOUS GLASS/POLYMER COMPOSITE ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1138377998.
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Woeckener, Nichole Lynn. « Spaced Retrieval Training to Assist in Wayfinding for Long-Term Care Residents with Dementia ». The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343161078.
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Lusini, Edoardo. « Comportamento e stabilità della spalla destra della diga di Ridracoli ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Trouver le texte intégralRésumé :
La diga di Ridracoli è una diga ad arco-gravità impostata su un ammasso di fondazione costituito da una alternanza ritmica di strati di arenaria e marna. La formazione di cunei di roccia sulle spalle rappresenta uno dei meccanismi di collasso maggiormente significativi per questa tipologia costruttiva. Tipicamente i problemi di stabilità in roccia vengono trattati con i metodi dell’equilibrio limite (LEM) lungo piani di discontinuità predefiniti e quindi approfonditi con analisi numeriche più complesse agli elementi finiti (FEM) o agli elementi distinti (DEM).
L’obiettivo di questa tesi è quello di riprendere ed integrare le analisi di stabilità del progetto esecutivo, limitatamente all’ammasso affiorante in spalla destra. Tra le forze agenti, oltre al peso proprio, figurano le componenti orizzontale e verticale dell’azione sismica pseudostatica, la spinta esercitata dalla diga, le sottospinte idrauliche e l’azione trasmessa dai numerosi tiranti alloggiati sulla spalla. Nell’ambito della tesi sono state condotte analisi LEM sia piane e sia tridimensionali ottenendo i coefficienti di sicurezza sia in fase di scavo sia con diga in esercizio sotto varie combinazioni delle forze instabilizzanti. In particolare, si è cercato di definire l’effetto del sistema di tiranti di ancoraggio posto in opera in fase di scavo sulla stabilità della spalla della diga in esercizio. Quindi si sono svolte analisi FEM limitatamente alla condizione di scavo e all’approssimazione piana del problema per verificare l’applicabilità del modello elasto-plastico Jointed Rock e l’utilizzo di interfacce piane per rappresentare specifici giunti di strato attraverso il programma FEM 2D Plaxis®.
Questo studio contribuisce a incrementare il livello di conoscenza circa le condizioni di stabilità della spalla e pone le basi per la futura implementazione di un modello FEM tridimensionale della porzione di ammasso oggetto di studio.
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Shahbazian, Mehdi. « Multiresolution denoising for arbitrarily spaced data contaminated with arbitrary noise ». Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/843064/.
Texte intégralRésumé :
Denoising is an essential ingredient of any data processing task because real data are usually contaminated by some amount of uncertainty, error or noise. The ultimate objective in this study is to handle the multiresolution denoising of an arbitrarily spaced multidimensional data set contaminated with arbitrary noise. Denoising is closely related to function estimation from noisy samples, which is best achieved by complexity control in a structured function space. Multiresolution analysis and wavelets provide a suitable structured space for function estimation. However, conventional wavelet decompositions, such as the fast wavelet transform, are designed for regularly spaced data. Furthermore, the projection and lifting scheme approaches for dealing with irregular data cannot be easily extended to higher dimensions and their application to denoising is not straightforward. In contrast, the least squares wavelet decomposition offers a method for direct decomposition and denoising of multidimensional irregularly spaced data. We show that the frequently applied level by level multiresolution least squares wavelet decomposition suffers from gross interpolation error in the case of irregularly spaced data. The simultaneous least squares wavelet decomposition, with careful wavelet selection, is proposed to overcome this problem. Conventional wavelet domain denoising techniques, such as global and level dependent thresholding, work well for regularly spaced data but more sophisticated coefficient dependent thresholding is required for irregularly spaced data. We propose a new data domain denoising method for Gaussian noise, referred to as the Local Goodness of Fit (LGF) algorithm, which is based on the local application of the conventional goodness of fit measure in a multiresolution structure. We show that the combination of the simultaneous least squares wavelet decomposition and the LGF denoising algorithm is superior to the projection and coefficient dependent thresholding and can handle arbitrarily spaced multidimensional data contaminated with independent, but not necessarily identically distributed, Gaussian noise. For denoising of data contaminated with outliers and/or non-Gaussian long tail noise, the decomposition methods based on mean estimation are not robust. We develop a new robust multiresolution decomposition, based on median estimation in a dyadic multiresolution structure, referred to as the Interpolated Block Median Decomposition (IBMD). The IBMD method overcomes the limitations of existing median preserving transforms and can handle multidimensional irregularly spaced data of arbitrary size. Thresholding methods for the coefficients of robust median preserving decompositions are currently limited to regular data contaminated with noise drawn independently and identically from a known symmetric distribution. To overcome these serious limitations, we develop a fundamentally new data domain robust multiresolution denoising procedure, called the Local Balance of Fit (LBF) algorithm, which is based on local balancing of the data points above and below the denoised function in a dyadic multiresolution structure. The LBF algorithm, which was inspired by the intuitive denoising style carried out by a human operator, is a distribution free method that can handle any arbitrary noise without a priori knowledge or estimation of the noise distribution. The combination of the robust IBMD decomposition and the LBF denoising algorithm can effectively handle a wide spectrum of denoising applications involving multidimensional arbitrarily spaced data contaminated with arbitrary and unknown noise. The only limitation is that the noise samples must be independent or uncorrelated.
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Queen, Jessica Jean. « Synthesis and Characterization of Phenyl-Spaced Nitronyl Nitroxide Semiquione Complexes ». NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-03252004-161928/.
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The study of magnetic materials has become of more interest now that these materials can be utilized in electronics. In the Shultz group we study the fundamentals of high spin biradicals for an understanding of their electronic nature. Past group members have synthesized a new high-spin biradical that combines two different spin containing units: a semiquinone and a nitronyl nitroxide. The work described here is a continuation of the characterization of the phenyl-spaced nitronyl nitroxide semiquinone zinc complex. New EPR studies were performed on the complex to complete the characterization of this high-spin biradical. New synthetic methods of the complex were also explored. Furthermore, a new tris-pyrazolyl borate ancillary ligand was pursued for this semiquinone complex that can be used in future semiquinone complexes.
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Shorter, Nicholas. « UNSUPERVISED BUILDING DETECTION FROM IRREGULARLY SPACED LIDAR AND AERIAL IMAGERY ». Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3965.
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As more data sources containing 3-D information are becoming available, an increased interest in 3-D imaging has emerged. Among these is the 3-D reconstruction of buildings and other man-made structures. A necessary preprocessing step is the detection and isolation of individual buildings that subsequently can be reconstructed in 3-D using various methodologies. Applications for both building detection and reconstruction have commercial use for urban planning, network planning for mobile communication (cell phone tower placement), spatial analysis of air pollution and noise nuisances, microclimate investigations, geographical information systems, security services and change detection from areas affected by natural disasters. Building detection and reconstruction are also used in the military for automatic target recognition and in entertainment for virtual tourism. Previously proposed building detection and reconstruction algorithms solely utilized aerial imagery. With the advent of Light Detection and Ranging (LiDAR) systems providing elevation data, current algorithms explore using captured LiDAR data as an additional feasible source of information. Additional sources of information can lead to automating techniques (alleviating their need for manual user intervention) as well as increasing their capabilities and accuracy. Several building detection approaches surveyed in the open literature have fundamental weaknesses that hinder their use; such as requiring multiple data sets from different sensors, mandating certain operations to be carried out manually, and limited functionality to only being able to detect certain types of buildings. In this work, a building detection system is proposed and implemented which strives to overcome the limitations seen in existing techniques. The developed framework is flexible in that it can perform building detection from just LiDAR data (first or last return), or just nadir, color aerial imagery. If data from both LiDAR and aerial imagery are available, then the algorithm will use them both for improved accuracy. Additionally, the proposed approach does not employ severely limiting assumptions thus enabling the end user to apply the approach to a wider variety of different building types. The proposed approach is extensively tested using real data sets and it is also compared with other existing techniques. Experimental results are presented.Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
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Snow, Richard. « Life history of juvenile alligator gar (Atractosteus spatula) in Oklahoma ». Thesis, Oklahoma State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1561714.
Texte intégralRésumé :
Daily ring formation has been validated for a variety of fish species, but there is little known information or data on ageing young of year Alligator Gar (Atractosteus spatula). Artificially spawned Alligator Gar fry with a known spawn date, hatch date, and swim-up date were stocked into two ponds at Tishomingo National Fish Hatchery and reared from 9 to 91 days post-hatch. Up to 10 individuals were sampled each week, and age in days was estimated from counts of presumptive daily rings in the otoliths (sagittae, lapilli, and astericsi). Mean daily ring count and known age were closely related to swim-up (sagitta r2 = 0.98, lapillus r2 = 0.99, asteriscus r2 = 0.93) indicating that daily ring deposition occurred in the otoliths of Alligator Gar 2 days after swim-up. Daily increment counts were accurate through 73 (sagitta), 86 (lapillus), however accuracy for asteriscus was very low throughout 86 days from swim-up. Age-bias plot for the lapillus visually showed no bias between readers. The resulting regression of ring counts against known age (age = -0.96 + 1.03*estimated age) was applied to wild caught Alligator Gar collected in the summer of 2013 from Lake Texoma, Oklahoma, to estimate spawn dates. Spawn dates seem to coincide with rising pool elevation of Lake Texoma and water pulses of tributaries.
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Erichsen, Helle Kirstein. « Characterisation of the spared nerve injury model of neuropathic pain / ». Cph. : The Danish University of Pharmaceutical Scienes, Department of Pharmacology, NeuroSearch, Kongl. Carolinska Medico Chirurgiska Institutet, 2003. http://www.dfh.dk/phd/defences/Hellekirsteinerichsen.htm.
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Greenaway, Ann. « Close-Spaced Vapor Transport for III-V Solar Absorbing Devices ». Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23185.
Texte intégralRésumé :
Capture of the energy in sunlight relies mainly on the use of light-absorbing semiconductors, in solar cells and in water-splitting devices. While solar cell efficiency has increased dramatically since the first practical device was made in 1954, production costs for the most-efficient solar absorbers, III-V semiconductors, remain high. This is largely a result of use of expensive, slow growth methods which rely on hazardous gas-phase precursors. Alternative growth methods are necessary to lower the cost for III-V materials for use in solar cells and improve the practicality of water-splitting devices.
The research goal of this dissertation is two-fold: to expand the capabilities of close-spaced vapor transport, an alternative growth method for III-Vs to demonstrate its compatibility with current technologies; and to explore the fundamental chemistry of close-spaced vapor transport as a growth method for these materials. This dissertation surveys plausibly lower-cost growth methods for III-V semiconductors (Chapter II) and presents in-depth studies on the growth chemistry of two ternary III-Vs: GaAs1-xPx (Chapter III) and Ga1-xInxP (Chapter IV). Finally, the growth of GaAs microstructures which could be utilized in a water-splitting device is studied (Chapter V).
This dissertation includes previously published and unpublished co-authored material.2019-01-09
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Ostapenko, Marina. « Kitataučių vaizdinys Lietuvos regioninėje spaudoje (dienraščiuose „Šiaulių kraštas“ ir „Klaipėda“) ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070816_160231-81644.
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Šiame magistro darbe aptariamas kitataučių vaizdinys Lietuvos masinėse informavimo priemonėse (spaudoje). Spaudos tyrimas paremtas 82 straipsnių, kuriuose kalbama apie kitataučius, analize, jie spausdinti 2004, 2005 metų sausį regioninėse Lietuvos dienraščiuose „Klaipėda“ ir „Šiaulių kraštas“.
Tyrime taikyta hermeneutinė, kokybinė ir kiekybinė turinio (content) analizė, paremta pagrįstosios teorijos (grounded theory) atvirojo kodavimo procedūromis.
Tiriamuoju laikotarpiu abiejuose dienraščiuose pasirodydavo po vieną ar net kelis straipsnius apie kitataučius per dieną. Tai reiškia, kad tiriamuoju laikotarpiu kitataučių tema žiniasklaidoje (regioniniuose laikraščiuose) yra nuolatinė. „Šiaulių krašte“ straipsnių apie kitataučius daugiau nei trečdaliu daugiau nei „Klaipėdoje“. Lyginant 2004 ir 2005 metų sausio mėnesio straipsnius, pastebėta jų daugėjimo tendencija vėlesniais metais.
Kitataučių temoms aprašyti dažniausiai naudojami vidutinio dydžio (0,5-1 puslapio) straipsniai. Didžioji dauguma straipsnių apie kitataučius yra iliustruota 1 ir daugiau nuotraukų. Ir „Šiaulių krašto“, ir „Klaipėdos“ dienraščių 1-ajame puslapyje buvo išspausdinti 22 straipsniai apie kitataučius.
Kitataučiai „Klaipėdoje“ ir „Šiaulių krašte“ daugiausiai pristatomi, kalbant apie jų gyvenamąsias vietas (nuo valstybės iki namų erdvės), žmogiškuosius faktorius (tokius kaip charakterio bruožai, išorė), jų socialinius ryšius – vyro ir moters santykius, santykius šeimoje, vestuvių ypatybes.
Aptiktos ir... [toliau žr. visą tekstą]In this master degree paper we discuss about foreigners portrait in Lithuanian mass media (newspapers). The research of the mass media discourse of foreigners was based on 82 articles about people from other countries (not Lithuanians), which were found in period 2004, 2005 January, and were taken from two daily newspapers – two big regional newspapers – „Klaipėda“ and „Šiaulių kraštas“. In this research combined approaches of hermeneutic, qualitative and quantitative content analysis, based on procedures of open and axel coding of grounded theory was used. In two Lithuanian periodic newspapers (2004, 2005 January) was published 1 article or more than 1 article about foreigners in a day, it means that foreigners theme in Lithuanian mass media is steady. Also was found, that regional daily newspaper of Šiauliai gives attention to foreigners' theme third more than regional daily newspaper of Klaipėda. Tendency of articles number increasing in period 2004, 2005 January was noticed. Size of the biggest part of articles was 0,5-1 pages, most of articles was illustrating article (had 1 or more photos), and 22 articles were on the first newspapers' page. The biggest part of articles headings and subheadings talk about foreigners' places to live (from country till home spread), their characters, how do they look like, their connections in families, connections between man and woman, wedding ceremonies. Foreigners in two Lithuanian daily newspapers mostly are presented in... [to full text]
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Xu, Quan. « Dynamic Adhesion and Self-cleaning Mechanisms of Gecko Setae and Spatulae ». Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407812/.
Texte intégralRésumé :
Geckos can freely climb on walls and ceilings against their body weight at speed of over 1ms-1. Switching between attachment and detachment seem simple and easy for geckos, without considering the surface to be dry or wet, smooth or rough, dirty or clean. In addition, gecko can shed dirt particles during use, keeping the adhesive pads clean. Mimicking this biological system can lead to a new class of dry adhesives for various applications. However, gecko’s unique dry self-cleaning mechanism remains unknown, which impedes the development of self-cleaning dry adhesives. In this dissertation we provide new evidence and self-cleaning mechanism to explain how gecko shed particles and keep its sticky feet clean. First we studied the dynamic enhancement observed between micro-sized particles and substrate under dry and wet conditions. The adhesion force of soft (polystyrene) and hard (SiO2 and Al2O3) micro-particles on soft (polystyrene) and hard (fused silica and sapphire) substrates was measured using an atomic force microscope (AFM) with retraction (z-piezo) speed ranging over 4 orders of magnitude. The adhesion is strongly enhanced by the dynamic effect. When the retraction speeds varies from 0.02 µm/s to 156 µm/s, the adhesion force increases by 10% ~ 50% in dry nitrogen while it increases by 15%~70% in humid air. A dynamic model was developed to explain this dynamic effect, which agrees well with the experimental results. Similar dynamic enhancement was also observed in aqueous solution. The influence of dynamic factors related to the adhesion enhancement, such as particle inertia, viscoelastic deformations and crack propagation, was discussed to understand the dynamic enhancement mechanisms. Although particles show dynamic enhancement, Gecko fabrillar hair shows a totally different trend. The pull off forces of a single gecko seta and spatula was tested by AFM under different pull-off velocities. The result shows that both the spatula and the seta have a rate independent adhesion response in normal retraction, which is quite different from micro-particles. Further research indicated the shape of the contact area was a key factor to the dynamic effect. In order to verify this hypothesis, artificial gecko spatula made of glass fibers was nanofabricated by a focus ion beam (FIB) and tested by AFM. These manmade spatulae also show a rate independent adhesion response. The dynamic adhesion of a single gecko seta and spatula were simulated with finite element analysis and the results also confirm the rate independent phenomena.. In conclusion, self-cleaning is induced by dynamic effect during gecko locomotion. The relative dynamic adhesion change between particles and seta makes it possible for gecko to shed the dirt particles while walking.Finally, the fatigue property of gecko seta was examined with the atomic force microscope under cyclic attachment/detachment process, mimicking gecko running. The adhesion force versus cycles has been tested and evaluated. Fatigue mechanism of gecko seta was also analyzed based on the experimental findings.
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Zangheri, Lorenzo. « Studio di un modello matematico parametrizzato per la generazione di superfici di spalle formatrici per macchine automatiche ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6514/.
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Bell, Amy Helen. « Nought were we spared, British women poets of the Great War ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq24956.pdf.
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Fabris, Ian. « Effects of closely-spaced buildings on dispersion of stack exhaust gases ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ34360.pdf.
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Lütkemeyer, Christian. « Konzeption eines Fractionally-Spaced Entzerrers mit quantisierter Rückkopplung und Noise-Whitening / ». Düsseldorf : VDI-Verl, 1999. http://www.gbv.de/dms/bs/toc/270561633.pdf.
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Rao, Atluri Neela. « Synthesis of unequally spaced and non-uniformly excited linear antenna arrays ». Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61715.
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