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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers

Arvelius, Johan January 2005 (has links)
<p>DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kiruna during the years 1997-2000.</p><p>The general interest in long-lived stratospheric tracers is to study the general global circulation of air in the stratosphere and the exchange between the stratosphere and troposphere. In the study of chemical ozone depletion in the stratosphere, long-lived tracers serve as an important reference to distinguish between the variations in ozone of dynamical and chemical origin.</p><p>This thesis focuses on calibrations and quality assessment of the measurements made with the third version of the DESCARTES instrument based at IRF. Two different general approaches to make calibrations are discussed. Uncertainty estimations for both of these methods are made and the results are tested by laboratory methods and by comparisons to other instruments, including comparisons between two versions of DESCARTES. Analyzed and calibrated flight data for all successful flights are presented.</p><p>The basic principle of the instrument is to chemically adsorb a number of tracers (in practice only CFC-11 is measured) in an adsorption bed of Carboxen in a micro trap through which the sampled air is driven by a pump. After recovery the adsorbed species in the trap is desorbed by electrical heating of the trap and analysed by gas chromatography.</p><p>The resulting estimated mixing ratios from the instrument are directly dependent on the adsorption of the sampled species being quantitative in the traps. Laboratory experiments are described using two traps in series, where the performance of the first is tested by sampling the breakthrough by the second. A model is developed to recreate these tests in order to be able to compensate for breakthrough during flights. The model showed that the adsorption in the traps is not explained by simple chromatographic theory and the results allow us only to give an estimation of the uncertainty due to breakthrough.</p> / <p>DESCARTES är ett lätt ballongburet provtagningsinstrument för stratosfäriska spårgaser. Det är utvecklat vid universitetet i Cambridge. DESCARTES-teamet vid Institutet för rymdfysik (IRF) i Kiruna har under åren 1997-2000 genomfört 33 flygningar med två olika versioner av instrumentet från nordliga latituder.</p><p>Det generella intresset av långlivade stratosfäriska spårgaser är att studera den globala cirkulationen i stratosfären och utbytet av luft mellan stratosfären och troposfären. För studier av den kemiska ozonnedbrytningen i stratosfären spelar långlivade spårgaser en avgörande roll som referens för att skilja mellan variation i ozonkoncentrationen av kemiskt och dynamiskt ursprung.</p><p>Denna avhandling fokuserar på kalibrering och kvalitetssäkring av mätningar gjorda med den tredje versionen av DESCARTES-instrumentet hemmahörande vid IRF. Två i grunden olika kalibreringsförfaranden för instrumentet behandlas. Osäkerhetsuppskattningar är gjorda för båda dessa metoder och resultaten är prövade i laboratorietester. Dessutom jämförs resultaten från två versioner av DESCARTES och andra instrument. Analyserade data från samtliga lyckade flygningar presenteras.</p><p>Den grundläggande principen för instrumentet är att pumpa luftprover genom en fälla som innehåller en bädd av det kemiska adsorptionsmaterialet Carboxen, som adsorberar ett antal spårgaser. När instrumentet hämtats tillbaka efter en flygning gasas de adsorberade ämnena i fällan ut genom att fällan upphettas på elektrisk väg. De utgasade ämnena analyseras med gaskromatografi. I praktiken kan endast CFC-11 analyseras.</p><p>Den slutgiltiga bestämningen av blandningsförhållandet från instrumentet är direkt beroende av att adsorptionen i fällorna för de ämnen man vill undersöka är fullständig. En serie laboratorieexperiment har genomförts där två likadana fällor kopplats efter varandra. På så sätt har tillförlitligheten av den första fällan kunnat studeras genom att uppmäta hur mycket som bryter igenom till den andra fällan. En modell har utvecklats för att förstå resultatet av dessa tester och kunna kompensera för eventuella genombrott vid provtagning under flygningar. Modellen visade att adsorptionen i fällorna inte kan förklaras med enkel kromatografisk teori. Resultaten ger endast möjlighet att bedöma osäkerheten i mätningarna till följd av risken för genombrott.</p>
32

Perceptions of residential grab bars among community dwelling seniors

Thrall, Patti L. 04 June 2012 (has links)
Despite the perceived importance of grab bars to facilitate aging-in-place and healthy aging, many community-dwelling older adults do not have them installed. The aim of this study was to investigate predictors of grab bar installation among well-educated community dwelling seniors. Data was collected quantitatively through an electronic survey of Oregon residents 50 years of age and older. The research analysis was completed using logistic regression with SPSS and qualitative analysis for the open questions. / Graduation date: 2012
33

Calibration and quality assessment of DESCARTES : grabsampler for stratospheric tracers

Arvelius, Johan January 2005 (has links)
DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kiruna during the years 1997-2000. The general interest in long-lived stratospheric tracers is to study the general global circulation of air in the stratosphere and the exchange between the stratosphere and troposphere. In the study of chemical ozone depletion in the stratosphere, long-lived tracers serve as an important reference to distinguish between the variations in ozone of dynamical and chemical origin. This thesis focuses on calibrations and quality assessment of the measurements made with the third version of the DESCARTES instrument based at IRF. Two different general approaches to make calibrations are discussed. Uncertainty estimations for both of these methods are made and the results are tested by laboratory methods and by comparisons to other instruments, including comparisons between two versions of DESCARTES. Analyzed and calibrated flight data for all successful flights are presented. The basic principle of the instrument is to chemically adsorb a number of tracers (in practice only CFC-11 is measured) in an adsorption bed of Carboxen in a micro trap through which the sampled air is driven by a pump. After recovery the adsorbed species in the trap is desorbed by electrical heating of the trap and analysed by gas chromatography. The resulting estimated mixing ratios from the instrument are directly dependent on the adsorption of the sampled species being quantitative in the traps. Laboratory experiments are described using two traps in series, where the performance of the first is tested by sampling the breakthrough by the second. A model is developed to recreate these tests in order to be able to compensate for breakthrough during flights. The model showed that the adsorption in the traps is not explained by simple chromatographic theory and the results allow us only to give an estimation of the uncertainty due to breakthrough. / DESCARTES är ett lätt ballongburet provtagningsinstrument för stratosfäriska spårgaser. Det är utvecklat vid universitetet i Cambridge. DESCARTES-teamet vid Institutet för rymdfysik (IRF) i Kiruna har under åren 1997-2000 genomfört 33 flygningar med två olika versioner av instrumentet från nordliga latituder. Det generella intresset av långlivade stratosfäriska spårgaser är att studera den globala cirkulationen i stratosfären och utbytet av luft mellan stratosfären och troposfären. För studier av den kemiska ozonnedbrytningen i stratosfären spelar långlivade spårgaser en avgörande roll som referens för att skilja mellan variation i ozonkoncentrationen av kemiskt och dynamiskt ursprung. Denna avhandling fokuserar på kalibrering och kvalitetssäkring av mätningar gjorda med den tredje versionen av DESCARTES-instrumentet hemmahörande vid IRF. Två i grunden olika kalibreringsförfaranden för instrumentet behandlas. Osäkerhetsuppskattningar är gjorda för båda dessa metoder och resultaten är prövade i laboratorietester. Dessutom jämförs resultaten från två versioner av DESCARTES och andra instrument. Analyserade data från samtliga lyckade flygningar presenteras. Den grundläggande principen för instrumentet är att pumpa luftprover genom en fälla som innehåller en bädd av det kemiska adsorptionsmaterialet Carboxen, som adsorberar ett antal spårgaser. När instrumentet hämtats tillbaka efter en flygning gasas de adsorberade ämnena i fällan ut genom att fällan upphettas på elektrisk väg. De utgasade ämnena analyseras med gaskromatografi. I praktiken kan endast CFC-11 analyseras. Den slutgiltiga bestämningen av blandningsförhållandet från instrumentet är direkt beroende av att adsorptionen i fällorna för de ämnen man vill undersöka är fullständig. En serie laboratorieexperiment har genomförts där två likadana fällor kopplats efter varandra. På så sätt har tillförlitligheten av den första fällan kunnat studeras genom att uppmäta hur mycket som bryter igenom till den andra fällan. En modell har utvecklats för att förstå resultatet av dessa tester och kunna kompensera för eventuella genombrott vid provtagning under flygningar. Modellen visade att adsorptionen i fällorna inte kan förklaras med enkel kromatografisk teori. Resultaten ger endast möjlighet att bedöma osäkerheten i mätningarna till följd av risken för genombrott.
34

A bed of ochre : mortuary practices and social structure of a maritime archaic Indian society at Port au Choix, Newfoundland /

Jelsma, Johan, January 2000 (has links)
Thesis (D.Lett.)--Rijksuniversiteit Groningen, 1961. / Includes bibliographical references.
35

Enjeux fonciers et développement "durable" au Mali / Land issues and sustainable development in Mali

Chene-Sanogo, Alima 20 December 2012 (has links)
Faire du Foncier un fait économique total, et du capital le moteur du développement, c’est donner un blanc-seing à la marchandisation de la terre. Faut-il vraiment que le Mali cède ses terres agricoles et ses ressources foncières pour accéder au développement? Pour quel développement ? Le développement exige-t-il le sacrifice de l’agriculture familiale paysanne et des méthodes traditionnelles séculaires de gestion du foncier ? Depuis son accession à la souveraineté nationale en 1960, le Mali, pays pauvre de l’Afrique au Sud du Sahara cherche à atteindre mais en vain un essor économique, social et industriel et cela par tous les moyens, à l’exception de la mise en place d’un modèle endogène de développement. Dans cette quête, il a dû souscrire au modèle de développement dominant qui n’est autre que celui capitaliste, fragilisé depuis toujours et présentement par les conséquences de ses limites à savoir la succession des crises alimentaire, sociale environnementale financière. Si ce revers du capitalisme a eu des effets sociaux importants dans les pays du sud, il a également conduit certains pays émergents et auteurs de capitaux à s’accaparer des ressources naturelles des pays les plus pauvres. Pris en tenaille entre la préservation de ses spécificités socio-écologiques sur le plan foncier et son envie d’atteindre le développement durable, le Mali voit dans la marchandisation des ressources foncières à grande échelle une véritable aubaine. Ainsi, il va adapter son cadre juridico-politique d’accès aux ressources foncières (au risque de décalage, d’incohérence et de flou entre ses stratégies politiques et la réalité foncière) afin d’attirer de nouveaux acteurs. Il prend par la même occasion le risque d’exposer son peuple aux conséquences prévisibles (la spoliation des droits fonciers coutumiers, l’accroissement de la pauvreté rurale et des inégalités, la destruction de l’agriculture familiale…) de ce passage sans transition à une économie mondialisée alors que les enjeux fonciers bien maîtrisés se révèlent être une véritable stratégie de gestion équilibrée de tout développement et surtout du développement durable. / Making the land issue a total economic phenomenon and capital the driving force of development equates to giving free rein to the commodification of the land. Is it really necessary for Mali to sell off its agricultural land and its land resources to access development? For what development? Does development demand that family-run small farming operations and age-old, traditional land management methods be sacrificed? Ever since the country attained national sovereignty in 1960, Mali ‒ a poor country in sub-Saharan Africa ‒ has been seeking in vain to achieve rapid economic, social and industrial development by all the means available, with the exception of the deployment of an endogenous development model. In that quest, Mali has had to subscribe to the dominant development model which is none other than the capitalist model, made vulnerable as it always has been and still is at present by the consequences of its limitations, namely the succession of food, social, environmental and financial crises. If the downside of capitalism has had far-reaching social effects in the southern countries, it has also led certain emerging countries and providers of capital to grab the natural resources of the poorest countries. Caught between preserving its socioeconomic specificities in land terms and its desire to achieve sustainable development, Mali regards the large-scale commodification of its land resources as a real windfall. It is thus going to adapt its legal and political system of access to land resources ‒ at the risk of seeing a blurring of vision, discrepancy and inconsistency between its political strategies and the reality of the land issue ‒ in order to attract new stakeholders. In so doing, Mali runs the risk of exposing its people to the foreseeable consequences of the changeover without transition to a globalized economy, including notably the despoliation of customary law land rights, increased rural poverty and inequality, and the destruction of family-run farming operations, whereas proper control of the land issue is shown to be a true strategy for the balanced management of any development and above all of sustainable development.
36

Lanový drapák / Grab Dredger

Kubánek, Jan January 2009 (has links)
When soluting the contruction of a grab dredger we will deal with suitable solution with reference to its using and capacity, possibilites of its setting in low temperatures and incidental aplication of the exchangeable abrasion - resistant mouldings. There will be made a calculation of forces taking effect on a grab dredger and a check calculation of the chosen structural parts.
37

Accumulation et résistance aux Philippines : conflits fonciers dans les hautes-terres du Negros Oriental

Litalien, Simon 01 1900 (has links)
No description available.
38

Key Labour Market Issues and Decent Work in Developing and Emerging Countries

Ostermeier, Martin 14 July 2020 (has links)
No description available.
39

Postcolonial biblical interpretation in the context of the Democratic Republic of the Congo : selected texts from Joshua 1-12

Bwalya, Laishi 11 1900 (has links)
The present research has been aimed at investigating how imperialism and colonialism are located both in the biblical text (cf. Joshua 1-12) and in present day interpretive postcolonial contexts such as that of the Democratic Republic of the Congo. An investigation was made of the unequal power dynamics at play between the Israelites who are depicted as mercilessly conquering the indigenous peoples of Canaan in the name of the deity, and the Canaanites. How were/ are such power dynamics played out in the Katangese, Democratic Republic of the Congo’s context in the relations between the then colonizers, that is, the Belgians as well as the neo-colonial African rulers and the Congolese peoples? It is argued that the Belgians assumed the role akin to that of the Israelite invaders as they mercilessly invaded the “promised land”, that is, the Democratic Republic of the Congo, ending with the brutal extermination of African peoples justified on biblical precedents. A conclusion is made that within the context of postcolonial biblical interpretation, the conquest narrative of Joshua 1-12 is one of the most traumatic stories in which violence is committed by one nation on another in the name of the deity. Postcolonial biblical criticism was found to be an appropriate approach in assisting the researcher to navigate through violent biblical texts with a view to coming up with a transformative reading of the texts in the (Katangese) context of the Democratic Republic of the Congo. / Old Testament and Ancient Near Eastern Studies / D. Litt. et Phil. (Biblical Studies)
40

"Zur Einscharrung der Cadaver"

Laubsch, Christoph 06 June 2018 (has links) (PDF)
"Zur Einscharrung der Cadaver" befasst sich als erste wissenschaftliche Arbeit mit den Begräbnispraktiken und den Begräbnisorten der anatomischen Einrichtungen in Dresden von 1748 bis 1864. Dabei konnte festgestellt werden, dass es sich bei den Begräbnissen um keine ehrvollen christlichen Bestattungen handelte und wo sich diese ehemaligen Bestattungsplätze im heutigen Stadtbild präzise verorten lassen. Die Ergebnisse zu den Begräbnispraktiken sind zudem Erkenntnisse, welche deutschland-, ja sogar weltweit bisher einmalig sind und weitere Fragen eröffnen.

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