Дисертації з теми "Protection for Sale"
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Foley, Fiona Lee. "Biting the Clouds: The Aboriginals Protection and Restriction of the Sale of Opium Act, 1897." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/371948.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Queensland College of Art
Arts, Education and Law
Full Text
Streer, Jan. "Die Umsetzung der Verbrauchsgüterkaufrichtlinie im englischen Recht durch die Sale and Supply of Goods to Consumers Regulations 2002 /." Frankfurt am Main [u.a.] : Lang, 2007. http://www.gbv.de/dms/spk/sbb/recht/toc/523584539.pdf.
Повний текст джерелаMarlow, Ilse. "The duties of the estate agent in the sale of residential property and the influence of the Consumer Protection Act 68 of 2008." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/77411.
Повний текст джерелаMini Dissertation (LLM)--University of Pretoria, 2019.
Mercantile Law
LLM
Unrestricted
De, Stadler Elizabeth Briers. "The scope of the application of the Consumer Protection Act 68 of 2008 in the context of the sale of defective goods in comparative perspective." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/27809.
Повний текст джерелаTissot, Stéphanie. "Effectivité des droits des créanciers et protection du patrimoine familial." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM1083/document.
Повний текст джерелаThe right to enforced performance offers creditors legal remedies for forcing defaulting debtors to perform their obligations. However, this relationship of obligation is less a tie between two people as it is a tie between two sets of assets. This explains why obligations are performed in respect of the property of the debtor. Performance should thus be entirely extraneous to the debtor's family situation and concern only the debtor's personal assets. Yet despite the fact that families do not have legal personality, "community property" (patrimoine familial) commonly comes into play. In the broad sense of the term, "community property" is thus necessarily of interest to third-party creditors. Certain property is afforded special protection generally intended to protect the family. In addition to legal protection, contractual protection may also apply. The legislation in this area thus allows for a certain degree of flexibility with respect to private will, even if it ultimately reduces a creditor's claim. This protection thus necessarily conflicts with the creditor's right to performance and raises the question of the legitimacy of the interference it causes. In some cases, the balance is maintained between guaranteeing creditors' ability to exercise their right to enforced performance and ensuring legitimate protection of family assets. In other cases, however, this balance is threatened or even upset, calling the entire tenor and intent of the right to enforced performance into question
Teufel, Anne Julia. "Der finanzierte Verbrauchsgüterkauf im deutschen und französischen Recht : rechtsvergleichende Untersuchung zum Verbraucherschutzrecht bei finanzierten Verträgen /." Baden-Baden Nomos, 2007. http://d-nb.info/989342867/04.
Повний текст джерелаReifner, Claire Anna. "Die Umsetzung der Verbrauchsgüterkaufrichtlinie in Italien und Deutschland /." Frankfurt am Main [u.a.] : Lang, 2007. http://www.gbv.de/dms/spk/sbb/recht/toc/522185894.pdf.
Повний текст джерелаRaftery, Kelley Lynne. "A Comparative Analysis of Wellhead Protection: Virginia and Massachusetts." Virginia Tech, 2002. http://hdl.handle.net/10919/37105.
Повний текст джерела
This paper compares and contrasts the effectiveness of groundwater Wellhead Protection Programs (WHPP) in Virginia and Massachusetts. These states take different management approaches to protect public groundwater drinking sources. Virginia encourages local governments to participate voluntarily in wellhead protection activities. Massachusetts requires all municipal and private suppliers that provide public drinking water to adopt a WHPP. The relative success achieved by Massachusetts and Virginia was evaluated with two measures: percentage of wellhead protection programs implemented and the percentage of state reported drinking water quality violations.
Master of Urban and Regional Planning
Ando, Amy Whritenour. "Endangered species protection and National Forest timber sales : three essays in economics." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10675.
Повний текст джерелаNguyen, Kien Trung. "Etude expérimentale du comportement instable d'un sable silteux : application aux digues de protection." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4709/document.
Повний текст джерелаThe constitutive materials of dikes are often silty sands whose mechanical behavior can become unstable at stress states located well under the Mohr-Coulomb plasticity limit criterion. This failure mechanism could explain several dike breaches whose occurrence has not been assigned to conventional mechanisms of dike failure such as internal erosion. The objective of this thesis is to better understand, with respect to the instability phenomenon, the mechanical behavior of a silty sand which is collected in the area adjacent of a breach of the Rhone embankment dike during the flood of 2003, by means of triaxial tests.The test results obtained on clean sand show that this material is very sensitive to the instability phenomenon. The occurrence of the latter can be predicted by an instability curve relating, at the onset of instability, the stress ratio to the state parameter. The analysis of these results suggests that a strong contractiveness of the material is the necessary condition for instability of loose sand and an appropriate direction of stress increment vector is the sufficient condition.The test results obtained on mixtures of sand with fines show that a removal of fine particles caused by an erosion, such as suffusion for example, favors the occurrence of instability in the dikes. Moreover, these results indicate that the equivalent void ratio is a relevant parameter in analyzing the behavior of silty sand. The calculation of the equivalent void ratio requires the determination of the parameter b for which a new formula has been proposed
Semenets, Natasha. "“Girls for sale” : Understanding the difficulties in protecting girls in Nepal from being exploited for prostitution." Thesis, Uppsala universitet, Teologiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384403.
Повний текст джерелаKudrna, Vladimír. "Ochrana spotřebitele na trhu zábavní pyrotechniky." Master's thesis, Vysoká škola ekonomická v Praze, 2009. http://www.nusl.cz/ntk/nusl-77735.
Повний текст джерелаHayes, Jonathan George. "The Methane Range: Coalbed Methane Development, Sage-Grouse protection, and The Ranching Way of Life." The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-12192008-143539/.
Повний текст джерелаHayes, Jonathan George. "The methane range coalbed methane development, sage-grouse protection, and the ranching way of life /." [Missoula, Mont.] : The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-12192008-143539/unrestricted/TheMethaneRange.pdf.
Повний текст джерелаTitle from author supplied metadata. Description based on contents viewed on June 20, 2009. ETD number: etd-12192008-143539. Includes bibliographical references.
Bambacas, Christyana Aspasia. "'The right to feel safe ' : a feminist analysis of protective behaviours programmes /." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09ARM/09armb199.pdf.
Повний текст джерелаEduful, Michael K. "Access to Safe Water Supply: Management of Catchment for the Protection of Source Water in Ghana." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7501.
Повний текст джерелаJacobs, Constanze. "Die Sachmängelgewähr im deutschen und belgischen Kaufrecht nach Umsetzung der Verbrauchsgüterkauf-Richtlinie /." Frankfurt am Main [u.a.] : Lang, 2006. http://www.gbv.de/dms/spk/sbb/recht/toc/515925438.pdf.
Повний текст джерелаFrank, Cornelia. "Access to Safe and Legal Abortion- a Human Right? : A study of the protection for access to Safe and Legal abortion within Public International Law." Thesis, Stockholms universitet, Juridiska institutionen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-182564.
Повний текст джерелаNepal, Prateek. "The Evaluation on the Effectiveness of Shields for Bridge Pier Protection." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613748984550897.
Повний текст джерелаEkwempu, Adaobi Ifeoma. "Safe Chemical Handling by Agrochemical Users in Plateau State, Nigeria." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/7137.
Повний текст джерелаWagner, Cory J. "OUTREACH COORDINATOR FOR THE UNREGULATED CONTAMINANT MONITORING REGULATION: AN INTERNSHIP WITH THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY." Miami University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=miami1073403309.
Повний текст джерелаFidora, Aldo Francesco. "Knowledge and Barriers to Safe Disposal of Pharmaceutical Products Entering the Environment." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/4624.
Повний текст джерелаStoeber, Michael. "Beschaffenheitsgarantien des Verkäufers /." Berlin : Duncker & Humblot, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014717578&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Повний текст джерелаYu, Zhao. "Corrosion and protections of Somaloy® components." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188951.
Повний текст джерелаSrisomwong, Rung, and n/a. "The protection of pre-registration rights in land: a comparative study of gazumping in Australian and other juridictions." University of Canberra. Law, 2005. http://erl.canberra.edu.au./public/adt-AUC20060725.124549.
Повний текст джерелаBahadir, Aydan. "Development Of The Eu Asylum Policy:preventing The Access To Protection." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605209/index.pdf.
Повний текст джерелаs territories. To this aim, after giving a general account of the development of EU Asylum competence, the thesis will extensively deal with the pre-entry and the post-entry access prevention measures which act to serve to this access prevention strategy. Under pre-entry access prevention measures, the thesis will deal with the visa requirement, carrier sanctions and other complementary tools which prevent the protection seekers from ever arriving at the EU territory. Under the post-entry access prevention mechanisms the thesis will analyze the &lsquo
safe third country&rsquo
and &lsquo
host third country&rsquo
implementations and readmission agreements which aim to divert the protections seekers summarily out of the EU territories. In analyzing these policies, the thesis will try to demonstrate how EU Member States try to shirk their non-refoulment obligation, which is the heart of the refugee protection regime, through applying legitimate deemed means.
Tarek, El-bashiti. "Trehalose Metabolism In Wheat And Identification Of Trehalose Metabolizing Enzymes Under Abiotic Stress Conditions." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1102482/index.pdf.
Повний текст джерела#945
-D-glucopyranosyl-1,1-&
#945
-D-glucopyranoside) is a non reducing disaccharide of glucose that occurs in a large variety of organisms, ranging from bacteria to invertebrate animals, where it serves as an energy source or stress protectant. Until recently, only few plant species, mainly desiccation tolerant &
#8216
resurrection&
#8217
plants, were considered to synthesize trehalose. Although most plant species do not appear to accumulate easily detectable amounts of trehalose, the discovery of genes for trehalose biosynthesis in Arabidopsis and in a range of crop plants suggests that the ability to synthesize trehalose is widely distributed in the plant kingdom. In this study, three wheat cultivars (Triticum aestivum L.) Tosun, Bolal (stress tolerant) and Ç
akmak (stress sensitive) were analysed for the presence of trehalose. Using gas chromatography-mass spectrometry (GC-MS) analysis, trehalose was unambiguously identified in extracts from seeds and seedlings of three different wheat cultivars (Bolal, Tosun and Ç
akmak). The trehalose amount was quantified by high performance liquid chromatography connected with refractory index detector. Effects of drought and salt stress on trehalose contents of wheat cultivars were studied at seedling level and trehalose analysis was achieved both on shoot and root tissues. It was found that trehalose had accumulated under salt and drought stress conditions in all wheat cultivars. The highest trehalose accumulation was detected in roots of Bolal cultivar under drought stress condition. Furthermore, trehalose metabolizing enzymes
trehalose-6-phosphate synthase (TPS) and trehalase enzyme activities were measured in roots and shoots of Bolal and Ç
akmak cultivars under control, salt and drought stress conditions. The most interesting results that we found that TPS activity sharply increased under stress conditions. The activity of TPS in roots under drought stress condition was the highest and reached to 3-4 times of its activity under control condition. The increase in the activity of TPS showed parallelism with trehalose accumulation under stress condition. Trehalase activity in Bolal cultivar decreased under both salt and drought stress conditions, however there was no significant change in trehalase activity of Ç
akmak variety.
Jeloschek, Christoph. "Examination and notification duties in consumer sales law how far should we go in protecting the consumer?" München Sellier, Europ. Law Publ, 2004. http://deposit.ddb.de/cgi-bin/dokserv?id=2674711&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаJeloschek, Christoph. "Examination and notification duties in consumer sales law : how far should we go in protecting the consumer? /." München : Sellier European Law Publ, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2674711&prov=M&dokv̲ar=1&doke̲xt=htm.
Повний текст джерелаAlmario, David R. "The Ability of the U.S. Military’s WBGT-based Flag System to Recommend Safe Heat Stress Exposures." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7727.
Повний текст джерелаHerre, Johnny. "Ersättningar i köprätten : särskilt om skadeståndsberäkning." Doctoral thesis, Handelshögskolan i Stockholm, Rättsvetenskap (RV), 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:hhs:diva-1416.
Повний текст джерелаAl-Shenawa, Amaal Abdallah Ali. "Effectiveness of Fillers for Corrosion Protection of AISI-SAE 1018 Steel in Sea Salt Solution." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984141/.
Повний текст джерелаAl-Ansari, Mae. "Masked in the Protective Act: Women, Public Housing & the Construction of ''Modern/National'' Identities in Kuwait." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479817691274608.
Повний текст джерелаGadt, Jeff W. "Hydrogeology and Hydrochemistry of the East-Central Portion of The Salt Lake Valley, Utah, as Applied to Wellhead Protection in a Confined To Semiconfined Aquifer." DigitalCommons@USU, 1994. https://digitalcommons.usu.edu/etd/6781.
Повний текст джерелаWilson, Jessica P. "Source Water Protection Planning in Ohio: Assessing the Integration of Land Use Planning and Water Management for Safe and Sustainable Public Drinking Water Sources." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593616149140822.
Повний текст джерелаWinkle, Thomas Michael [Verfasser], Klaus [Akademischer Betreuer] Bengler, Eric [Gutachter] Hilgendorf, and Klaus [Gutachter] Bengler. "Requirements to develop safe automated vehicles: A dilemma between innovation and consumer protection / Thomas Michael Winkle ; Gutachter: Eric Hilgendorf, Klaus Bengler ; Betreuer: Klaus Bengler." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1236692241/34.
Повний текст джерелаLudwig, Johannes. "Präventive Sicherungsmaßnahmen für Kulturgüter auf der Grundlage des humanitären Völkerrechts und die Fortentwicklung durch das Konzept der Safe Havens." Beiträge des UNESCO-Lehrstuhls für Internationale Beziehungen, 2019. https://tud.qucosa.de/id/qucosa%3A33836.
Повний текст джерелаRouèche, Emilie. "Influence des paramètres de vibrations sur la rhéologie d'un milieu granulaire : Application au remplissage des fusibles." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2005. http://tel.archives-ouvertes.fr/tel-00012118.
Повний текст джерелаBeesetty, Pavani. "Role of bax, ibpA, ibpB and cspH Genes in Protecting CFT073 (Uropathogenic Escherichia coli) Against Salt and Urea Stress." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1364042868.
Повний текст джерелаBotha, Werner. "Investigating the Sherwin Williams Sales Model : towards developing a similar model in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/97279.
Повний текст джерелаENGLISH ABSTRACT: Retailing is a common modern day phenomenon for which there are many angles of research widely and easily available. Retailing in the context of the global paint and coatings industry however, is a more specified and unique field of study of which resources for research are few. Having had the opportunity of a first-hand close-up inside look into, not only one of the world’s leading paint and coatings companies, but also the global leader in company-owned paint and coatings retailing. This global leader not only led to the origin of my research, but also rekindled the passion within for the global paint and coatings industry and trade. Prior to my employment by PPG, towards the end of 2013, I intentionally embarked on a journey with The Sherwin Williams Company during 2011 to 2013, in collaboration with my current employer at the time, Duraline paints, who afforded me the opportunity only a few people had or ever will.. During the course of four years, I had the opportunity to not only meet a series of wonderful people across the various segments, as well as internal departments of the Sherwin Williams Company globally. Additionally I also had the opportunity to visit the company’s headquarters, 101 Prospector Avenue, Cleveland, Ohio, on numerous occasions whilst staying in close proximity for the duration of the training and strategic planning sessions, in preparation to duplicate the SHW in South Africa. During my involvement with The Sherwin Williams Company, it was evident that the backbone of the company’s sales model, was the consistency as well as continuous growth of the Paint Stores Group; which is the leading North American retail segment of SHW. Since 2011, in an effort to establish the best method of implementation of this sales model in South Africa, various concepts were explored from several angles. It became evident that much research was required to establish feasibility of the SHW sales model in South Africa. Preliminary research however, would have had to be conducted of what the SHW sales model entailed and how it would benefit the company in being a global leader, thereby also exploring the possibility of it being an industry best practice as foundation to what was precisely required to be implemented in South Africa, prior to establishing feasibility in South Africa. The preliminary research became the primary and sole focus of this research project, not only fulfilling the research needs as explained above, but also to serve as evidence of what I perceived the SHW company and the Paint Stores Group to be whilst dealing with the company.
Farley, Céline. "The promotion of safe behaviours at the community level : evaluation of a bicycle helmet-wearing campaign among 5- to 12-year-old children /." Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-685-5/.
Повний текст джерелаRootman, Lemmer. "Same sex families' resilience processes associated with family identity." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/60980.
Повний текст джерелаDissertation (MEd)--University of Pretoria, 2016.
Educational Psychology
MEd
Unrestricted
Shammo, Johannes Hanna, and Saad Faris Asaad Betti. "Skyddsutrustningen och logistikens påverkan på effektiviteten och olyckshändelserna." Thesis, KTH, Byggteknik och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260328.
Повний текст джерелаЗубро, А. Б., та A. B. Zubro. "Cовершенствование механизмов гражданской защиты населения муниципального образования : магистерская диссертация". Master's thesis, б. и, 2021. http://hdl.handle.net/10995/98037.
Повний текст джерелаDuring the research, civil protection was analyzed the population of the municipality of the city of megion; clarified concepts:"civil protection", "mechanism of civil protection of the population";defined the role and place of civil protection in the city of megion, the main whose function is to protect the city's population from the destructive impact of negative phenomena of natural and technogenic origin; analysis of civil protection the population of the city showed the main problematic issues concerning civil protection of the population; a project to improve mechanisms of civil protection of the population.
Johnsson, Lovisa. "Dataskyddsförordningens tillämplighet vid personuppgiftshantering i molntjänster : En studie av Dataskyddsförordningen, utifrån perspektivet användande av molntjänster." Thesis, Linköpings universitet, Affärsrätt, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-137192.
Повний текст джерелаEntekhabi, Saleh [Verfasser], and Sven [Akademischer Betreuer] Otto. "Novel protective function of an isoprenoid, geranylgeraniol (GGOH), in human bone cells treated with zoledronate: an in vitro study / Saleh Entekhabi ; Betreuer: Sven Otto." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1206877901/34.
Повний текст джерелаFaraj, Essalhin. "Le contrat électronique." Thesis, Paris 1, 2016. http://www.theses.fr/2016PA01D076.
Повний текст джерелаE-commerce activities and the legal frame that results from them raise many relevant questions. Especially those related to the consumer protection at the moment of conclusion and implementation of the contract.In this study we analyzed the legal regulations that govern electronic contracts in order to establish correlations with common law regulation. We noticed that E-contracts are also subject to legal rules framed by the obligations of the seller and the buyer such as delivery, reception, payment, signature of the contract, the right to withdrawal, etc.E-contracts constitute an issue of international controversy. The rules of competences of jurisdiction and the applicable laws are especially disputed.We concluded that the legal value of electronic contracts depends to a great extent on the legal value of the electronic writing and signature
Monteiro, Nivaldo Aparecido Pedro. "Crimes e relação de consumo: aplicabilidade do processo penal em empreendimentos gastronômicos." Pontifícia Universidade Católica de São Paulo, 2013. https://tede2.pucsp.br/handle/handle/6245.
Повний текст джерелаThis research aims to demonstrate that the Criminal Code and the Consumer Protection (Law 8.078/90) are many times ignored by owners, employees and customers of gastronomic ventures. Since July 2010, all the shops and services in the country are required to keep available for consultation with clients the Code of Consumer Protection, in a conspicuous and easily accessible. The study will classify the probable frauds committed by eating establishments and identifying the penalties that should be imposed on the author in case of noncompliance with the law. Will be checked also the possible use of the Code of Criminal Procedure, Law No. 12.403, of May 4, 2011 amending the provisions of Decree-Law No. 3,689, of October 3, 1941, relating to procedural arrest, bail, temporary freedom and other precautionary measures beyond the application of adequate alternative measures that guide the ways to prevent and deter these crimes, increasing their effectiveness in protecting the consumer. It is also necessary to apply the Criminal Code against any illegal practices committed by entrepreneurs in this sector, that hurt consumer relations and thus identify the standards applicable to food establishments that may charge penalties when these entrepreneurs are not observed
Esta pesquisa tem como objetivo demonstrar que o Código Penal e o Código de Defesa do Consumidor (Lei 8.078/90) são por muitas vezes ignorados por proprietários, funcionários e clientes de empreendimentos gastronômicos. Desde julho de 2010, todos os estabelecimentos comerciais e de prestação de serviços do país estão obrigados a manter disponíveis para a consulta dos seus clientes o Código de Defesa do Consumidor, em local visível e de fácil acesso. O estudo irá classificar as prováveis fraudes cometidas por estabelecimentos de alimentação e identificar as penas que devem ser impostas ao autor no caso de descumprimento da lei. Será verificada também a possível utilização do Código de Processo Penal, da Lei nº 12.403, de 4 de maio de 2011 que altera dispositivos do Decreto-Lei nº 3.689, de 3 de outubro de 1941, relativos à prisão processual, fiança, liberdade provisória e demais medidas cautelares além da aplicação das medidas alternativas adequadas, que norteiam os caminhos para evitar e deter estes crimes, alcançando sua eficácia na proteção do consumidor. É necessário também aplicar o Código Penal contra eventuais práticas ilegais cometidas pelos empresários desse setor, que ferem as relações de consumo e assim identificar as normas aplicáveis aos estabelecimentos de alimentação que podem imputar sanções penais aos empreendedores quando tais não forem observadas
Boige, François. "Caractérisation et modélisation électrothermique compacte étendue du MOSFET SiC en régime extrême de fonctionnement incluant ses modes de défaillance : application à la conception d'une protection intégrée au plus proche du circuit de commande." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0084/document.
Повний текст джерелаNowaday, the challenge of the transition to carbon-free energy involves a systematic use of electrical energy with power electronics at the heart of the exchanges. To meet the challenges, power electronics requires increasingly high-performance devices to provide a high level of integration, high efficiency and a high level of reliability. Today, the power transistor, of the MOSFET type, made of silicon carbide (SiC) is a breakthrough technology that allows us to meet the challenges of integration and efficiency through their low level of loss and high switching speed. However, their limited reliability and low robustness at extreme operating conditions such as repetitive short-circuits are now hindering their expansion in industrial applications. In this thesis, an in-depth study of the short-circuit behaviour of an exhaustive set of commercial devices, describing all the structural and technological variants involved, was carried out on a specific test bench developed during the thesis, in order to quantify their short-circuit resistance. This study highlighted both generic and singular properties of SiC semiconductors for every Mosfet version such as a dynamic gate leakage current and a failure mode by a short-circuit grid-source leading, under certain conditions of use and for certain Mosfet structures, to a self-blocking drain-source. A systematic research of the physical understanding of the observed mechanisms was carried out by an approach combining an internal technological analysis of the failed devices and a fine electrothermal modelling. A compact electrothermal modeling extended to failure mode consideration has been established and implemented in circuit software. This model was confronted with numerous experimental results describing a short-circuit cycle up to failure. This model offers an interesting analytical support and also helps the design of protection circuits. Thus, as an application, a driver equipped with a digital processing part has been designed and validated in detection mode for several short-circuit scenarios but also potentially for the detection of the degradation of the power component grid. Other more exploratory work has also been carried out in partnership with the University of Nottingham to study the impact of repeated pulse short-circuit regimes on the aging of parallel chips with dispersions. The propagation of a first failure mode from a "weak" device was also studied. This work paves the way for the design of intrinsically safe and available converters by taking advantage of the atypical and original properties of SiC semiconductors and Mosfet in particular
Maia, Josemir Moura. "RestriÃÃo de crescimento induzida por estresse salino como uma estratÃgia de defesa oxidativa em raÃzes de feijÃo-caupi." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1818.
Повний текст джерелаA presente tese propÃs testar a hipÃtese de que a reduÃÃo no comprimento de raÃzes de feijÃo-caupi, tratadas com NaCl, pode està relacionada com mudanÃas na atividade de enzimas antioxidantes intracelulares e apoplÃsticas. Isto seria relacionado ao aumento e/ou controle da concentraÃÃo de espÃcies reativas oxigÃnio por mecanismos enzimÃticos que controlam o crescimento. O trabalho foi subdividido em 5 capÃtulos independentes e interligados. O primeiro capÃtulo trata de uma revisÃo teÃrica do tema abordado na tese justificando-a e colocando em evidÃncia a relevÃncia cientÃfica do trabalho. Esta revisÃo trata de todos os aspectos abordados na tese, alÃm de temas conexos como a descriÃÃo das vias sinalizaÃÃo ativadas sobre estresse salino e algumas molÃculas sinalizadoras. No capÃtulo 2, avaliou-se o efeito do NaCl no comprimento da raiz, conteÃdo relativo de Ãgua (CRA), teor de massa seca, concentraÃÃo de Na+ e relaÃÃo K+/Na+ alÃm da atividade de dismutase de superÃxido (SOD), peroxidase de ascorbato (APX), peroxidase de fenÃis (POX) e catalase (CAT) nas cultivares PÃrola (sensÃvel) e PitiÃba (resistente) de feijÃo-caupi, contrastantes quanto à resistÃncia ao estresse salino e oxidativo no estÃdio de germinaÃÃo. Este trabalho possibilitou concluir que embora as cultivares apresentem grau de sensibilidade diferenciado ao NaCl e estresse oxidativo, no estÃdio de germinaÃÃo, essas caracterÃsticas nÃo sÃo mantidas no estÃdio fisiolÃgico de plantula. AlÃm disso, os parÃmetros avaliados nÃo foram capazes de determinar diferenÃas contrastantes entre as duas cultivares que pudessem classificÃ-las como resistente e/ou susceptÃvel ao sal. No intuito de compreender melhor os mecanismos antioxidantes das cultivares estudadas e avaliar se a concentraÃÃo de NaCl interfere na reposta das mesmas, no capÃtulo 3 determinou-se comprimento radicular, CRA e concentraÃÃo de Na+, alÃm das atividades de SOD, APX, CAT e POX em raÃzes de plÃntulas tratadas com 0; 25; 50; 75 e 100 mM de NaCl durante dois dias. Este capÃtulo possibilitou concluir que a resposta no crescimento e na atividade de enzimas antioxidantes à dependente da dose e da cultivar. Ademais, verificou-se que um sistema envolvendo a atividade de POX poderia estar associado tanto à manutenÃÃo dos nÃveis de H2O2 quanto à reduÃÃo no comprimento radicular. Para determinar se os mecanismos antioxidantes sÃo dependentes do tempo de exposiÃÃo ao NaCl, no capÃtulo 4, raÃzes de feijÃo-caupi da cultivar PitiÃba foram tratadas com 0; 50 e 100 mM de NaCl durante 0; 24; 48; 72 e 96 horas. Neste capÃtulo, demonstrou-se que a reduÃÃo no comprimento radicular, depende da dose e do tempo de exposiÃÃo ao NaCl e que os efeitos sÃo acompanhados por um acÃmulo de Na+ nos tecidos, embora isto nÃo leve a uma peroxidaÃÃo de lipÃdeos. Este capÃtulo tambÃm levantou dÃvidas com relaÃÃo ao envolvimento das enzimas SOD, APX, CAT e POX durante o crescimento. Para contribuir com a elucidaÃÃo desses mecanismos o capÃtulo 5 envolveu pelo menos 3 experimentos onde as plÃntulas de feijÃo-caupi foram expostas a perÃodos de estresse de curta e longa duraÃÃo. Nestes experimentos foram relacionados o metabolismo das espÃcies reativas de oxigÃnio de apoplasto com a atividade de oxidase de NADPH (NOX), SOD apoplÃstica e POX de parede celular. Uma explicaÃÃo plausÃvel para uma relaÃÃo entre o estresse oxidativo e o estresse salino à que a resposta antioxidante pode simular parcialmente uma resposta hipersensitiva. As enzimas NOX, SOD apoplÃstica e POX de parede apresentaram um aumento de atividade precedido de uma explosÃo oxidativa. Adicionalmente o H2O2 pode funcionar como sinalizador celular de estresse e ser coadjuvante na lignificaÃÃo da parede.
In the present thesis, the hypothesis that the salt-induced impairment of root growth is due to changes in the symplastic and apoplastic antioxidant enzyme activity was investigated. Root growth impairment may be related to the enhancement and/or the control of the reactive oxygen species by enzymatic systems involved in growth regulation. This work was divided into five interconnected chapters. The first is a theoretical review of the approached subject and includes the scientific relevance of this study. This review details the oxidative mechanisms involved in root growth regulation under salinity, besides the signaling pathways activated under salt stress and related signaling molecules. In the chapter 2, the PÃrola (sensitive) and PitiÃba (resistant) cultivars showing contrasting responses to salt stress at germination were evaluated during the seedling stage. Four-day-old seedlings were exposed to 100 mM NaCl for two days and it was determined the root length, dry weight, relative water content (RWC), Na+ content, K+/Na+ ratio and the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), phenol peroxidase (POX) and catalase (CAT). The obtained results were insufficient to categorize the tested cultivars as sensitive or resistant to salt stress at the seedling stage. The effect of the external NaCl concentration on the antioxidant responses in the studied cultivars was investigated in the chapter 3. It was assessed the root lenght, RWC, Na+ content and the activity of SOD, APX, CAT, and POX in seedlings treated with 0; 25; 50; 75 and 100 mM NaCl during two days. The root growth impairment was more pronounced in the PitiÃba cultivar under 100 mM NaCl. Additionally, it was verified that a metabolic network involving the POX activity could be associated with the maintenance of H2O2 levels and the root growth restriction. In the chapter 4, a time-course of the antioxidant responses were assessed in the PitiÃba cultivar. Then, the seedlings were exposed to 0, 50 and 100 mM NaCl during 0; 24; 48; 72; and 96 h and the same variables determined in the previous experiment were evaluated again. It was demonstrated that the root length reduction depends on the NaCl concentration and the time of exposure. Although the root Na+ content could suggest Na+ toxicity, no lipid peroxidation was detected. The involvement of SOD, APX, CAT, and POX activity in root growth regulation was minutely investigated in the chapter 5. Thus, the seedlings were exposed to salt stress in short- and long-term experiments. The reactive oxygen species metabolism in the apoplastic fraction was associated with the activity of NADPH oxidase (NOX), apoplastic SOD and cell wall POX. It is possible that oxidative stress and salt stress are interconnected as the antioxidant response could mimic the hypersensitive reaction. NOX, apoplastic SOD and cell wall POX showed enhanced activity preceding an oxidative burst. Additionally, H2O2 could act as an extracellular signal triggered by stress and play a role in cell wall strengthening.