Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 516 for “"Ingenieurwissenschaften"”.
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Synthese von Gold(I)-Dithioharnstoff-Methansulfonat und dessen Anwendungsmöglichkeiten
… wurden an der Hochschule Mittweida, Fakultät Ingenieurwissenschaften, bei Prof. Köster, Professur Fertigungs- und Oberflächentechnik, durchgeführt. Dabei zeigte sich, dass eine für technische Anwendungen geeignete galvanische Abscheidung von Gold aus Gold(I)-Dithioharnstoff-Methansulfonat aus …
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Antennenmodellierung mit Diagrammsynthese zur Systemanalyse von konformen Gruppenantennen
The present work deals with theoretical principles of antenna modelling and pattern synthesis methods for antenna arrays on arbitrarily shaped surfaces including numerical and experimental results for selected exemplary geometries. A novel antenna modelling method is presented which is based on …
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Verlustleistungs-Modellierung exemplarischer Schlüsselkomponenten der hochratigen digitalen Signalverarbeitung
With the continuous exponential growth in complexity and the increasing performance potential of highly integrated CMOS circuits, the power dissipation of such circuits has become one of the most serious design problems. This is not limited to obvious applications, such as hand-held and …
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Experimentelle Untersuchungen zur bimanuellen Koordination als transiente Kopplung bei der Richtungsspezifikation
The accurate execution of bimanual movements is important for almost all work. At the same time, there is only a limited amount of appropriate and possible combinations. Limitations arise from the task itself, but the human movement system also causes limitations. They might be due to its …
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Numerische Untersuchung unterschiedlicher Mischeinrichtungen zur Minimierung der Stickoxidemission
During the development of burners, the main aim is to reduce the harmful emission. In this work, the numerical investigations of different kind of mixing apparatus were made to reduce the NOx-emission during the combustion of oil. The air-stages, fuel-distributions and the fuel-vaporization are …
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Schnellbewertung der Erdbebengefährdung von Gebäuden
The first objective of this Dissertation is to develop a method for the seismic vulnerability assessment in three Levels (Level I-III) in the framework of the Eurocode 8. The application of this method to a building enables the user to quantify the expected building damage for different seismic …
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Physical modeling of the singing voice
This thesis deals with the physical modeling of the parts of the voice organ relevant for voice generation plus techniques for the measurement of acoustic voice properties. An introduction to characteristics of the voice signal is followed by a literature survey of existing approaches for the most …
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Beschleunigter Stoffaustrag aus Reaktordeponien
Water recycling to the landfill body today is tested or already applied on a large scale in order to control and to accelerate the biodegradation processes within the reactor “landfill“. Targeted water recycling to the landfill body aims at accelerated decomposition of all degradable material …
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PVD-Schichten in Verdrängereinheiten zur Verschleiß- und Reibungsminimierung bei Betrieb mit synthetischen Estern
Hydrostatic pumps and motors are essential components of hydraulic systems. They transform mechanical energy into hydraulic energy and vice versa. Hydrostatic displacement units and their standard fluids based on mineral oils have been developed to a high technical standard. The fluids in this case …
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Simulation von Verbrennungsprozessen mit einem stochastischen Partikel-Modell
A new method for the simulation of combustion processes is developed that includes fluctuations. The simulation of reaction-diffusion-systems is extended by the variables temperature and velocity so that heat release by the chemical reactions as well as a flowfield can be represented. The model is …
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Einfluß des Spannungszustandes während des hydraulischen Tiefungsversuchs auf das Umformverhalten von Blechwerkstoffen
In this thesis a new measuring method for a new method of measuring for the stress strain curve under multi axial stress condition was developed and by means of this special measuring gadget the influence on the forming behaviour und hardening behaviour was investigated. Especially the availability …
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Radial mass transfer enhancement in bubble train flow
Compared with single-phase laminar pipe flow, two-phase bubble-train flow shows a significantly increased rate of mass transfer between liquid and wall. The present work is a study of this effect over a wide range of the governing variables. The problem has been numerically simulated and …
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Erstarrung einer technischen Al-Si-Mg-Legierung in Silica-Aerogelformen
The Observation, detection and control of the form filling and solidification process of metal melts is of great importance for the development of optimized gating systems and perfectly designed microstructures in modern casting technology. In the casting process metal melts are usually poured into …
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Modellierung der Auswirkungen von Störlichtbögen in elektrischen Anlagen
An internal arc in electrical systems is a rare event. However, if it arises, it can endanger persons apart from the interruption of the power supply and the damage of electrical apparatus. For the control of its effects, in particular the modelling of the pressure development in its environment, …
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Regelungsstrategien für permanentmagnetische Direktantriebe mit mehreren Freiheitsgraden
Multi-dimensional motion control in robots and machine tools are often realized by connecting several rotational or linear one-dimensional drives in series. This thesis describes a new electrical drive concept for permanent magnet direct drives with multiple degrees of freedom. As an example, a …
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Untersuchungen zur Realisierung von Corecatchern
Ensuring a reliable energysupply while at the same time following economical and ecological interests is one of the major challenges of modern energy politics. As CO2-emissions are held responsible for world wide climate changes international authorities demand reduction of those. Facing growing …
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Untersuchung von 4-Wirbelsystemen zur Minimierung von Wirbelschleppen und ihre Realisierung an Transportflugzeugen
A numerical approach for assessing the potential of 4-vortex wakes concerning an alleviation of the wake vortex hazard is presented. The first step of the numerical approach comprises the systematic investigation of 4-vortex topologies representing generic farfield vortex wakes. Once a …
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Raumakustik - Interaktion visueller und auditiver Wahrnehmungen
The subjective impression of space on people is determined by different elements. Important roles are played by architectural elements such as shape, size, colours, lighting and etc. In addition the acoustics can supplement this determination especially at use some types of the spaces, in which …
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