• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 15
  • 5
  • 4
  • 3
  • 3
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 44
  • 5
  • 5
  • 5
  • 5
  • 5
  • 5
  • 4
  • 4
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 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

Space Object Detection and Monitoring Using Persistent Wide Field of View Camera Arrays

Fitzgerald, Garrett 13 July 2022 (has links)
No description available.
32

The impact of solar geometry on architectural strategies

Salazar Del Pozo, Andres 19 February 2018 (has links)
Designing architecture is related to producing vast amounts of information based on constraints, experience or common sense, and at the same time, those designs are assisted by specialized software, but, are the results of those processes giving you advantage or are they leading you in the wrong way? For example, should you include shading elements or less glazing? Should you change the shape of the building or improve envelope specifications? This research is a start to understand how to approach to design problems related to solar geometry, recognize which variables are worth modifying, reduce potential of error when iterating, and take truly advantage of the output delivered by modeling tools. / Master of Architecture
33

Apprentissage supervisé de données symboliques et l'adaptation aux données massives et distribuées / Supervised learning of Symbolic Data and adaptation to Big Data

Haddad, Raja 23 November 2016 (has links)
Cette thèse a pour but l'enrichissement des méthodes supervisées d'analyse de données symboliques et l'extension de ce domaine aux données volumineuses, dites "Big Data". Nous proposons à cette fin une méthode supervisée nommée HistSyr. HistSyr convertit automatiquement les variables continues en histogrammes les plus discriminants pour les classes d'individus. Nous proposons également une nouvelle méthode d'arbres de décision symbolique, dite SyrTree. SyrTree accepte tous plusieurs types de variables explicatives et à expliquer pour construire l'arbre de décision symbolique. Enfin, nous étendons HistSyr aux Big Data, en définissant une méthode distribuée nommée CloudHistSyr. CloudHistSyr utilise Map/Reduce pour créer les histogrammes les plus discriminants pour des données trop volumineuses pour HistSyr. Nous avons testé CloudHistSyr sur Amazon Web Services (AWS). Nous démontrons la scalabilité et l’efficacité de notre méthode sur des données simulées et sur les données expérimentales. Nous concluons sur l’utilité de CloudHistSyr qui , grâce à ses résultats, permet l'étude de données massives en utilisant les méthodes d'analyse symboliques existantes. / This Thesis proposes new supervised methods for Symbolic Data Analysis (SDA) and extends this domain to Big Data. We start by creating a supervised method called HistSyr that converts automatically continuous variables to the most discriminant histograms for classes of individuals. We also propose a new method of symbolic decision trees that we call SyrTree. SyrTree accepts many types of inputs and target variables and can use all symbolic variables describing the target to construct the decision tree. Finally, we extend HistSyr to Big Data, by creating a distributed method called CloudHistSyr. Using the Map/Reduce framework, CloudHistSyr creates of the most discriminant histograms for data too big for HistSyr. We tested CloudHistSyr on Amazon Web Services. We show the efficiency of our method on simulated data and on actual car traffic data in Nantes. We conclude on overall utility of CloudHistSyr which, through its results, allows the study of massive data using existing symbolic analysis methods.
34

Mezinárodní dobrovolnictví a jeho role v profesním a osobnostně sociálním rozvoji / International volunteering and its role in the professional, personal and social development

Čapková, Šárka January 2014 (has links)
This diploma thesis investigates international volunteering in the context of professional, personal and social development of young volunteers. In the theoretical part, definition, history, forms and subjects involved are presented, together with the impacts and ethical questions related to the field. Next, the professional, personal and social development is defined and international volunteering is put in light as a source of important skills. The empirical part is concerned with one specific form of international volunteering - workcamps. Firstly, organisation INEX-SDA, which sends hundreds of youngsters to workcamps each year, is introduced. Next, methodology and results of an original qualitative research focused on the role of workcamps in workcamp-participants' lifes are discussed. The results suggest that workcamps have various impacts on and connectedness with the participants' development, the professional as well as the personal and social. By some, the workcamp's impact on their life and development is perceived as subtle, while others see significant effects, workcamps had on their life and skills. Whole spectrum of skills and values that can be acquired on workcamps is revealed and described in relation to career and personal life. Key words international volunteering, international...
35

The Metabolic Physiology of Planarian Flatworms

Lewallen, Melissa A 08 1900 (has links)
Using a high throughput closed respirometry method to measure oxygen consumption, I determined metabolic rates in asexual and sexual Schmidtea mediterranea and Girardia dorotocephala, as a function of temperature, taxon, stressors, reproductive mode, age, regeneration, and specific dynamic action. This study has shown that oxygen consumption can reliably be measured in planaria using optode closed respirometry, and also provided a reliable method for measuring wet mass in planaria, which has been a challenge to researchers in the past. This research revealed that oxygen consumption in S. mediterranea is 1.5-2.1X greater in the sexual strain over the asexual strain at 13-18°C. Within the sexual strain, oxygen consumption is 1.5 -2.2X greater in sexually mature adults over the sexually immature groups (hatchlings, juveniles, and regenerating sexuals). Furthermore, I was able to quantify differences in sexual morphology between these groups exhibiting significant differences in oxygen consumption. The results of this research supports a theory of higher metabolic costs with sexual maturity in S. mediterranea. Therefore, this study has established sexual and asexual S. mediterranea as simple, yet attractive models for investigating energetic costs between sexual and asexual phenotypes. This research also provided quantitative values for specific dynamic action in planaria, with a maximum increase in oxygen consumption of 160% induced by feeding, as well as metabolic relationships in planaria involving temperature, age, and regeneration. These values establish planaria as one of the simplest animal models in which common metabolic patterns, such as SDA and poikilothermic temperature sensitivity, have been demonstrated. Therefore, this research has contributed to the overall knowledge of the basic physiology in this animal, providing the framework for future metabolic studies in planaria involving environmental factors, reproduction, regeneration, development, and aging. Information from this study may supplement interpretation and understanding of modern cellular, molecular, and genomic studies in planaria.
36

Síntesis y caracterización avanzada de materiales zeolíticos mediante el empleo de nuevos agentes orgánicos directores de estructura

Sala Gascón, Andrés 03 October 2022 (has links)
[ES] Las zeolitas han destacado por sus aplicaciones en procesos catalíticos y de adsorción/separación de gases de alto impacto industrial. Esto es debido a que presentan propiedades de tamiz molecular como consecuencia de sus estructuras microporosas y, además es posible ajustar sus propiedades catalíticas variando su composición química, presencia de defectos estructurales, tamaño promedio de cristal, etc. Hasta el momento se han reconocido 255 estructuras zeolíticas diferentes, pero la obtención de zeolitas con nuevas estructuras es un aspecto muy relevante dentro de la ciencia de materiales ya que permite ampliar el rango de aplicaciones de estos materiales. Por ello, el objetivo fundamental de esta tesis doctoral es la obtención de nuevos materiales zeolíticos, empleándose para ello, cationes orgánicos que actuarán como agentes directores de estructura (ADEs) en la cristalización de zeolitas. Así, se ha estudiado el empleo cationes derivados de biciclopirrolidina como ADEs sintetizados mediante reacciones orgánicas de cicloadición [3+2]. Estos ADEs han sido efectivos en la síntesis de zeolitas, obteniéndose diversos sólidos microporosos cuya preparación había sido descrita anteriormente con otros cationes orgánicos. Sin embargo, uno de los cationes empleados ha dado lugar a la cristalización de una nueva zeolita, denominada ITQ-69, que presenta un sistema tridireccional de canales rectos, de poro pequeño (8 x 8 x 8 R) y ausencia de cavidades. Este material ha sido efectivo en la separación selectiva de propileno de propano en su forma de germanosilicato. La síntesis de zeolitas quirales, es sin duda el objetivo más ambicioso propuesto. En esta tesis se ha explorado el empleo de derivados de azúcares como parte fundamental en la síntesis de ADEs. En concreto, se ha explorado la isomanida como unidad sintética quiral en la preparación de dicationes quirales. Cuando la isomanida se combina con la presencia de imidazolios (altamente selectivos hacía la estructura STW) se ha obtenido un material STW en forma de germanosilicato. Este sólido cristaliza formando cristales de tamaño suficientemente grande como para realizar estudios de difracción de Rayos X en monocristal, y determinar el exceso enantiomérico de distintas preparaciones. En todos los casos, se obtiene cristales S-STW homoquirales enantimórficamente puros, constituyendo el primer ejemplo de obtención selectiva quiral de una zeolita reportado hasta la fecha. En esta parte de la tesis, también se obtuvieron zeolitas con topología STW empleando ADEs no quirales. Algunos de estos sólidos, se evaluaron en la separación de hidrocarburos con diferentes grados de ramificación (zeolita STW puramente silícea) y en la reducción selectiva de NO con propano (zeolita Al-STW intercambiadas con Cu). Finalmente, se han estudiado diferentes cationes organofosforados como ADEs. La elevada estabilidad de estos cationes en el medio de síntesis, ha permitido la obtención de una nueva zeolita, ITQ-70, que presenta un elevado grado de defectos de conectividad y una muy baja densidad de red. La estructura de la zeolita ITQ-70 presenta un sistema de supercavidades con ventanas interconectadas de acceso a las mismas (20 x 20 x 18 R) y cristaliza con un grupo de simetría proquiral. / [CAT] Zeolites are well-known for their industrial applications. The presence of pores of molecular dimensions forming a structured channels system confers them the property of performing as a molecular sieve. This characteristic of zeolites, combined with the possibility of modifying their chemical composition, structural defects, average crystal size, etc., provides them with exceptional properties for catalytic and separation processes. Up to now, 255 different zeolitic structures have been compiled. However, obtaining zeolites with new structures remains an important challenge in materials science and broadening their applications. Therefore, the main objective of this doctoral thesis is the obtention of new zeolitic materials using organic cations as structure-directing agents (SDAs) in the crystallization process. Thus, the use of bicyclopyrrolidine-derived cations as ADEs, synthesized by organic cycloaddition reactions [3+2], has been studied. Several microporous solids whose preparation had been previously described using other organic cations have been obtained by utilizing these bicyclopyrrolidine-derived cations as ADEs. In addition, the crystallization of a new zeolite, ITQ-69, has been reached. This structure presents a tridirectional system of straight small pore size channels (8 x 8 x 8 R) and the absence of cavities. ITQ-69, in its germanosilicate form, has been proved to be significantly effective for the separation of propylene from propane. Obtaining chiral zeolite is undoubtedly one of the most ambitious objectives proposed in the field of zeolite synthesis. In this thesis, sugar derivatives have been specifically considered as starting molecules for the synthesis of chiral ADEs. Particularly, the synthesis of dicationic ADEs starting from isomannide as a chiral synthetic unit has been explored. When isomannide was combined with imidazole (highly selective towards the STW structure), a STW-structure material in the form of germanosilicate was obtained. This solid crystallizes forming sufficiently large crystals to perform single-crystal X-ray diffraction studies and determine the enantiomeric excess of different preparations. In all cases, enantiomorphically pure homochiral S-STW crystals are obtained, constituting the first reported example of chiral selective synthesis of a zeolite. Zeolites with STW structure were also obtained using non-chiral ADEs. The properties of these microporous solids were evaluated in the separation of hydrocarbons with different branching, in the form of purely siliceous STW, and in the selective reduction of NO with propane using Cu-exchanged Al-STW zeolites. Finally, different organophosphorus cations have been studied as ADEs. The high stability of these cations in the zeolites crystallization medium has allowed the isolation of a new zeolite, ITQ-70, which presents a high number of connectivity defects and a very low lattice density. The structure of the ITQ-70 zeolite possesses a super-cavity system with interconnected access windows (20 x 20 x 18) and crystallized with a prochiral symmetry group. / [EN] Les zeolites han destacat per les seues aplicacions en processos catalítics i processos d'adsorció/separació de gasos d'alt impacte industrial. Açò és degut al fet que presenten propietats de tamís molecular a conseqüència de les seues estructures microporoses i, a més és possible ajustar les seues propietats catalítiques variant la seua composició química, presència de defectes estructutals, grandària del cristall, etc. Fins al moment es reconeixen 255 estructures zeolítiques diferents, però l'obtenció de zeolites amb noves estructures és un aspecte molt rellevant dins de la ciència de materials, ja que permet ampliar el rang d'aplicacions d'aquests materials. Per tant, l'aspecte fonamental d'aquesta tesi doctoral és l'obtenció de nous materials zeolítics empleant cations orgànics que actuaran com a agents directors d'estructura (ADEs) en la cristal·lització de zeolites. Així, s'ha explorat l'us de cations derivats de biciclopirrolidina com ADEs sintetitzats mitjançant reaccions orgàniques de cicloadició [3+2]. Aquests ADEs han sigut efectius en la síntesis de zeolites, obtenint-se diversos sòlids microporosos, la preparació dels quals havia sigut descrita anteriorment amb altres cations orgànics. No obstant, un dels cations empleats ha donat lloc a la cristal·lització d'una nova zeolita, denominada ITQ-69, que presenta un sistema tridireccional de canals rectes, porus xicotets (8 x 8 x 8 R) i absència de cavitats. Aquest material ha sigut efectiu en la separació selectiva de propilé de propà en la seua forma de germanosilicat. Dins de la síntesi de zeolites, la síntesi de zeolites quirals, és sens dubte un dels objectius més ambiciosos proposats. En aquesta tesi s'ha explorat l'ús de derivats de sucres com a part fonamental en la síntesi de ADEs. En concret, s'ha explorat la isomanida com a unitat sintètica quiral en la preparació de dications quirals. Quan la isomanida es combina amb la presència de imidazolios (altament selectius feia l'estructura STW) s'ha obtingut un material STW en forma de germanosilicato. Aquest sòlid cristal·litza formant cristalls de grandària prou gran com per a realitzar estudis de difracció de Raigs X en monocristall, i determinar l'excés enantioméric de diferents preparacions. En tots els casos, s'obté cristalls S-STW homoquirals enantimórficament purs, constituint el primer exemple d'obtenció selectiva quiral d'una zeolita reportat fins a la data. En aquesta part de la tesi, també es van obtindre zeolites amb topologia STW empleant ADEs no quirals. Alguns dels materials STW es van avaluar les propietats d'aquests sòlids microporosos en la separació d'hidrocarburs amb diferents graus de ramificació amb STW purament silici i en la reducció selectiva de NO amb propà empleant zeolites Al-STW intercanviades amb Cu. Finalment, s'han estudiat diferents cations organofosforats com ADEs. L'elevada estabilitat d'aquests cations en el mitjà de cristal·lització de zeolites ha permés aïllar una nova zeolita, ITQ-70, que presenta un elevat grau de defectes de connectivitat i una molt baixa densitat de xarxa. L'estructura de la zeolita ITQ-70 té un sistema compost per supercavitats amb finestres interconnectades d'accés a les mateixes (20 x 20 x 18) i cristal·litza amb un grup de simetria proquiral. / Al Ministerio de Economía, Industria y Competitividad por concederme la Beca BES-2016-078684 que ha permitido la realización de esta tesis doctoral, junto a la ayuda económica proporcionada en los proyectos MAT2015-71842 y RTI2018-101784-B-100. A la Generalitat Valenciana su financiación a través del proyecto PROMETEO/2021/07 y por último a la Universidad Politécnica de Valencia (UPV), al Consejo Superior de Investigaciones Científicas (CSIC) y al Instituto de Tecnología Química (ITQ) por proporcionar las instalaciones y equipamiento necesarios para llevar a cabo el trabajo de investigación. / Sala Gascón, A. (2022). Síntesis y caracterización avanzada de materiales zeolíticos mediante el empleo de nuevos agentes orgánicos directores de estructura [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/186873 / TESIS
37

Managing resource sharing in selected Seventh-day Adventist tertiary institutions in Sub-Saharan Africa: problems and prospects

Adeogun, Margaret Olufunke 30 November 2004 (has links)
Universities in the new millennium find themselves in a knowledge-driven economy that is challenging them to produce a qualified and adaptable work force if they are to contribute to societal development. Owing to the structural change in the economy, entrepreneurs require high level scientists, professionals and technicians who not only have the capability to create and support innovations by adapting knowledge to local use but also people with managerial and lifelong learning skills. Such are they who can accelerate changes and make organizations more productive and efficient in the services they render. Consequently, universities in Sub-Saharan Africa are challenged to transform learning so as to produce graduates who have both knowledge and competencies. Such a system will create a balance between university education and the changing labour market. Satisfying these new educational demands are only possible through research and unhindered access to global information resources. Paradoxically, some private university libraries, because of limited funding, find themselves fiscally constrained in the provision of unhindered access to global stores of information particularly at a time of exponential growth both in number and cost of information resources. This had led libraries to re-examine resource sharing as a viable option to meeting the new demands placed on universities. It is for the reasons above that this study examines the practice, problems and prospects of resource-sharing in selected Seventh-day Adventist university libraries in Sub-Saharan Africa. It examines scientifically the causes of poor sharing practices that are unique to each library, the situational and environmental factors that can enhance resource sharing. It provides also research-based information that will help to determine the best ways by which each library can have greater access to information resources. There are proposals for resolving the problems, and there are recommendations for dealing with the matter on a more permanent basis. The study advances resource-sharing model called Consortium of Adventist University Libraries in Africa (CAULA) as a resource sharing network for Seventh-day Adventist libraries in Africa. The organizational structure for CAULA are outlined and discussed. The proposed cooperation is not only sustainable but also structured to provide efficiency and greater regional cooperation of SDA libraries in Sub-Saharan Africa. / Information Science / DLITT ET PHIL (INF SCIENCE)
38

The centrality of Jesus Christ in God's acts of creation, reconciliation, renewal and fulfilment : the views of John Calvin and Ellen G White

Jones, Patrick Patrese 05 1900 (has links)
In John Calvin and Ellen G White’s sense making approaches God’s act of redemption and reconciliation in and through Jesus Christ takes the centre stage in the foursome of God’s acts expressed in the biblical historical timeline as creation, reconciliation in Jesus Christ, renewal through the Holy Spirit and fulfilment at the end of time. While the 16th century Calvin emphasised God’s acts of creation and reconciliation in Christ more than God’s acts of renewal and fulfilment, the 19th century White’s emphasis was more on God’s acts of reconciliation in Christ and fulfilment at the end of time than on creation and renewal through the Spirit. With all the differences in their sense making approaches their central perspectival focus in their writings, sayings and doings is the way God and humanity, heaven and earth are closely connected in a unity without being fused and mixed in Jesus Christ. Their central christological theme of ‘God staying God’ and ‘human staying human’ in an interactional substantialist sense in Christ designates the great alternative view that differs on the one hand, from the view of the trans-substantialist option in which the human being Christ Jesus is in a sacramental-sacred way transformed into ‘a divine human being’ –, and on the other hand, the view of the consubstantialist option in which the human being Jesus is permeated and diffused by his divinity, thereby becoming ‘the human God.’ Calvin and White in their reflection operating within the realm of divine historicity that is staying within the biblical historical timeline from Genesis to Revelation were viewed by many as not theologians in the real sense of the word. Calvin and may be to a greater extent White worked and contributed to the new and emerging field of Faith Studies in which a theologian or theorist of faith cannot reflect on God, human beings or the natural cosmic world in three separate avenues as was commonly the case with speculative and scholastic theologies in history. White’s Faith Studies contribution is in the global arena of theology where the omnipresent ‘–logies’ of mainline church theologies such as Christology, Ecclesiology, Pneumatology and Eschatology hold sway.
39

Caractérisation des aérosols par inversion des données combinées des photomètres et lidars au sol.

Nassif Moussa Daou, David January 2012 (has links)
Aerosols are small, micrometer-sized particles, whose optical effects coupled with their impact on cloud properties is a source of large uncertainty in climate models. While their radiative forcing impact is largely of a cooling nature, there can be significant variations in the degree of their impact, depending on the size and the nature of the aerosols. The radiative and optical impact of aerosols are, first and foremost, dependent on their concentration or number density (an extensive parameter) and secondly on the size and nature of the aerosols (intensive, per particle, parameters). We employed passive (sunphotmetry) and active (backscatter lidar) measurements to retrieve extensive optical signals (aerosol optical depth or AOD and backscatter coefficient respectively) and semi-intensive optical signals (fine and coarse mode OD and fine and coarse mode backscatter coefficient respectively) and compared the optical coherency of these retrievals over a variety of aerosol and thin cloud events (pollution, dust, volcanic, smoke, thin cloud dominated). The retrievals were performed using an existing spectral deconvolution method applied to the sunphotometry data (SDA) and a new retrieval technique for the lidar based on a colour ratio thresholding technique. The validation of the lidar retrieval was accomplished by comparing the vertical integrations of the fine mode, coarse mode and total backscatter coefficients of the lidar with their sunphotometry analogues where lidar ratios (the intensive parameter required to transform backscatter coefficients into extinction coefficients) were (a) computed independently using the SDA retrievals for fine mode aerosols or prescribed for coarse mode aerosols and clouds or (b) computed by forcing the computed (fine, coarse and total) lidar ODs to be equal to their analog sunphotometry ODs. Comparisons between cases (a) and (b) as well as the semi-qualitative verification of the derived fine and coarse mode vertical profiles with the expected backscatter coefficient behavior of fine and coarse mode aerosols yielded satisfactory agreement (notably that the fine, coarse and total OD errors were <~ sunphotometry instrument errors). Comparisons between cases (a) and (b) also showed a degree of optical coherency between the fine mode lidar ratios.
40

Das neue Kontaktmodell mit endlicher Reibung in Creo Simulate 3.0 : Theorie und Anwendung ; Vergleich mit dem reibungsfreien und unendlich reibungsbehafteten Kontaktmodell / The New Contact with Finite Friction Feature in Creo Simulate 3.0 : Theory and Application ; Comparison with the Friction-Free and Infinite Friction Contact Models

Jakel, Roland 22 July 2016 (has links) (PDF)
Der Vortrag beschreibt die zugrunde liegende Theorie und die Softwarefunktionalität des in PTC Creo Simulate 3.0 eingeführten Kontaktmodells mit endlicher Reibung und vergleicht dieses mit den bis Creo Simulate 2.0 exklusiv verwendeten Kontaktmodellen (ideal reibungsfrei und unendlich reibungsbehaftet). An zwei Modellbeispielen (ein von zwei Bremsbacken geklemmtes Bremsschwert und ein verschraubtes Schwungrad) wird versucht, die Funktionsweise des neuen Modells zu demonstrieren. Wegen aktueller Qualitätsprobleme der Software wird die Brauchbarkeit der Kontaktmodelle für den Anwender bewertet (Stand Creo 3.0 M080 / Creo 2.0 M200) und umfangreiches Feedback an den Softwarehersteller PTC gegeben. / The presentation describes the underlying theory and software functionality of the finite friction contact model introduced with PTC Creo Simulate 3.0. It is being compared with the friction-free and infinite friction contact model used exclusively until Creo Simulate 2.0. It is being tried to demonstrate the mode of operation of the new model with help of two examples: A brake sword clamped by two brake pads and a bolted flywheel. Because of actual software quality problems, the usability of the contact model for the user is being rated (status Creo 3.0 M080 / Creo 2.0 M200). Furthermore, comprehensive feedback is given to the software developer PTC.

Page generated in 0.0223 seconds