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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.
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Showing 131 to 139 of 139 (0.036 seconds)| 131 |
Gescheiterte Innovationen : Fehlschläge und technologischer Wandel /Bauer, Reinhold. January 2006 (has links) (PDF)
Helmut-Schmidt-Univ., Habil.-Schr.--Hamburg, 2004. / Literaturverz. S. [324] - 351.
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Analyse der Wirkung des technischen Wandels auf die Politik am Beispiel der Gen- und Biotechnologie /Saalbach, Klaus-Peter. January 2008 (has links)
Zugl.: Osnabrück, Univ., Habil.-Schr., 2007.
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Kampf der Paradigmen : die Literatur zwischen Geschichte, Biologie und Medizin : Flaubert, Zola, Fontane /Bender, Niklas. January 2009 (has links)
Freie Universität Berlin, Diss., 2007.
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Three step modelling approach for the simulation of industrial scale pervaporation modulesSchiffmann, Patrick 07 February 2014 (has links)
The separation of aqueous and organic mixtures with thermal separation processes is an important and challenging task in the chemical industry. Rising prices for energy, stricter environmental regulations and the increasing demand for high purity chemicals are the main driving forces to find alternative solutions to common separation technologies such as distillation and absorption. These are mostly too energy consumptive and can show limited separation performance, especially when applied to close boiling or azeotropic mixtures. Pervaporation can overcome these thermodynamic limitations and requires less energy because only the separated components need to be evaporated. This separation technology is already well established for the production of anhydrous solvents, but not yet widely distributed in the chemical and petrochemical industry due to some crucial challenges, which are still to overcome.
Besides the need of high selective membranes, the development of membrane modules adapted to the specific requirements of organoselective pervaporation needs more research effort. Furthermore, only few modelling and simulation tools are available, which hinders the distribution of this process in industrial scale.
In this work, these issues are addressed in a combined approach. In close collaboration with our cooperation partners, a novel membrane module for organophilic pervaporation is developed. A novel technology to manufacture high selective polymeric pervaporation membranes is applied to produce a membrane for an industrially relevant organic-organic separation task. A three step modelling approach ranging from a shortcut and a discrete to a rigorous model is developed and implemented in a user interface. A hydrophilic and an organophilic membrane are characterised for the separation of a 2-butanol/water mixture in a wide range of feed temperature and feed concentration in order to establish a generally valid description of the membrane performances. This approach is implemented in the three developed models to simulate the novel membrane module in industrial scale. The simulations are compared to the results of pilot scale experiments conducted with the novel membrane module. Good agreement between simulated and experimental values is reached.
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Business Cycle Models with Embodied Technological Change and Poisson ShocksSchlegel, Christoph 28 May 2004 (has links)
The first part analyzes an Endogenous Business Cycle model with embodied technological change. Households take an optimal decision about their spending for consumption and financing of R&D. The probability of a technology invention occurring is an increasing function of aggregate R&D expenditure in the whole economy. New technologies bring higher productivity, but rather than applying to the whole capital stock, they require a new vintage of capital, which first has to be accumulated before the productivity gain can be realized. The model offers some valuable features: Firstly, the response of output following a technology shock is very gradual; there are no jumps. Secondly, R&D is an ongoing activity; there are no distinct phases of research and production. Thirdly, R&D expenditure is pro-cyclical and the real interest rate is counter-cyclical. Finally, long-run growth is without scale effects. The second part analyzes a RBC model in continuous time featuring deterministic incremental development of technology and stochastic fundamental inventions arriving according to a Poisson process. In a special case an analytical solution is presented. In the general case a delay differential equation (DDE) has to be solved. Standard numerical solution methods fail, because the steady state is path dependent. A new solution method is presented which is based on a modified method of steps for DDEs. It provides not only approximations but also upper and lower bounds for optimal consumption path and steady state. Furthermore, analytical expressions for the long-term equilibrium distributions of the stationary variables of the model are presented. The distributions can be described as extended Beta distributions. This is deduced from a methodical result about a delay extension of the Pearson system.
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Künstliche Intelligenz: Strategie für den Freistaat Sachsen06 December 2023 (has links)
Künstliche Intelligenz – kaum ein Schlagwort prägt derzeit die Faszination für die digitale Zukunft ebenso wie die Diskussion, wie uns KI helfen kann, unsere Zukunft gut und nachhaltig zu gestalten. KI hat nicht nur als Schlagwort Einzug in unsere gesellschaftlichen Debatten gehalten. Vielmehr kommen wir im täglichen Leben immer mehr mit KI-Anwendungen in Kontakt, bewusst oder unbewusst. Was hat das für Folgen für jede einzelne bzw. jeden einzelnen von uns? Wie wirkt sich der (vermeintliche) Siegeszug von Algorithmen und den darauf aufbauenden Anwendungen und Produkten auf unser Leben aus? Ist KI etwas, was einfach »geschieht«, ohne dass wir es aufhalten können? Oder können wir diese neue Technologie verstehen und gestalten?
Redaktionsschluss: 01.09.2021
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Schutz von technischen Massnahmen im Urheberrecht : die WIPO-Internetabkommen und deren Umsetzung in den Vereinigten Staaten, der Europäischen Union und der Schweiz /Girsberger, Michael. January 2007 (has links) (PDF)
Diss. Univ. Luzern, 2006. / Buchhandelsausg. der Diss. Luzern, 2006. Bibliogr.
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Technology-based transformation in automotive supply chain: Role of organizational developmentYakoob, Rahima 10 February 2022 (has links)
Innovation, digitalization, technology disruption, fast to market are commonly used terms in the technology industry. However, in today’s world, these terms are used to define the state of art of the automotive industry. The onset of innovative vehicle models and the technology-driven vehicle manufacturing in the automotive industry offers many opportunities and an equivalent amount of challenges. Therefore, how an organization reacts to the ongoing technology discontinuities and how an organization transforms its business model to adapt to the changes to
sustain in the industry are becoming significant factors in evaluating its strategic value and determining its success. This doctoral research titled ‘Technology-Based Transformation in Automotive Supply Chain – Role of Organizational Development aims to investigate the critical factors of technology-based transformation in the automotive industry using the automotive supply chain as the research set-up to demonstrate the ongoing transformation. This doctoral research further strives to conceptualize an organizational development framework that seamlessly enables organizations to manage technology-based transformation.
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The Darwinian revolution as a knowledge reorganizationZacharias, Sebastian 24 February 2015 (has links)
Die Dissertation leistet drei Beiträge zur Forschung: (1) Sie entwickelt ein neuartiges vierstufiges Modell wissenschaftlicher Theorien. Dieses Modell kombiniert logisch-empiristische Ansätze (Carnap, Popper, Frege) mit Konzepten von Metaphern & Narrativen (Wittgenstein, Burke, Morgan), erlaubt so deutlich präzisiere Beschreibungen wissenschaftlicher Theorien bereit und löst/mildert Widersprüche in logisch-empiristischen Modellen. (Realismus vs. Empirismus, analytische vs. synthetische Aussagen, Unterdeterminiertheit/ Holismus, wissenschaftliche Erklärungen, Demarkation) (2) Mit diesem Modell gelingt ein Reihenvergleich sechs biologischer Theorien von Lamarck (1809), über Cuvier (1811), Geoffroy St. Hilaire (1835), Chambers (1844-60), Owen (1848-68), Wallace (1855/8) zu Darwin (1859-1872). Dieser Vergleich offenbart eine interessante Asymmetrie: Vergleicht man Darwin mit je einem Vorgänger, so bestehen zahlreiche wichtige Unterschiede. Vergleicht man ihn mit fünf Vorgängern, verschwinden diese fast völlig: Darwins originärer Beitrag zur Revolution in der Biologie des 19.Jh ist klein und seine Antwort nur eine aus einer kontinuierlichen Serie auf die empirischen Herausforderungen durch Paläontologie & Biogeographie seit Ende des 18. Jh. (3) Eine gestufte Rezeptionsanalyse zeigt, warum wir dennoch von einer Darwinschen Revolution sprechen. Zuerst zeigt eine quantitative Analyse der fast 2.000 biologischen Artikel in Britannien zwischen 1858 und 1876, dass Darwinsche Konzepte zwar wichtige Neuerungen brachten, jedoch nicht singulär herausragen. Verlässt man die Biologie und schaut sich die Rezeption bei anderen Wissenschaftlern und gebildeten Laien an, wechselt das Bild: Je weiter man aus der Biologie heraustritt, desto weniger Ebenen biologischen Wissens kennen die Rezipienten und desto sichtbarer wird Darwins Beitrag. Schließlich findet sich sein Beitrag in den abstraktesten Ebenen des biologischen Wissens: in Narrativ und Weltbild – den Ebenen die Laien rezipieren. / The dissertation makes three contributions to research: (1) It develops a novel 4-level-model of scientific theories which combines logical-empirical ideas (Carnap, Popper, Frege) with concepts of metaphors & narratives (Wittgenstein, Burke, Morgan), providing a new powerful toolbox for the analysis & comparison of scientific theories and overcoming/softening contradictions in logical-empirical models. (realism vs. empiricism, analytic vs. synthetic statements, holism, theory-laden observations, scientific explanations, demarcation) (2) Based on this model, the dissertation compares six biological theories from Lamarck (1809), via Cuvier (1811), Geoffroy St. Hilaire (1835), Chambers (1844-60), Owen (1848-68), Wallace (1855/8) to Darwin (1859-1872) and reveals an interesting asymmetry: Compared to any one of his predecessors, Darwins theory appears very original, however, compared to all five predecessor theories, many of these differences disappear and it remains but a small original contribution by Darwin. Thus, Darwin’s is but one in a continuous series of responses to the challenges posed to biology by paleontology and biogeography since the end of the 18th century. (3) A 3-level reception analysis, finally, demonstrates why we speak of a Darwinian revolution nevertheless. (i) A quantitative analysis of nearly 2.000 biological articles reveals that Darwinian concepts where indeed an important theoretical innovation – but definitely not the most important of the time. (ii) When leaving the circle of biology and moving to scientists from other disciplines or educated laymen, the landscape changes. The further outside the biological community, the shallower the audience’s knowledge – and the more visible Darwin’s original contribution. After all, most of Darwin’s contribution can be found in the narrative and worldview of 19th century biology: the only level of knowledge which laymen receive.
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