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Showing 1 to 20 of 121 for “"530 Physik"”.
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Numerische Simulation mechanischer Wellen in dreidimensionalen elastisch-plastischen Festkörpern mit Diskontinuitätsflächen und Rissen
Thickness effects on fracture mechanical parameters for dynamically loaded three-dimensional elastic-plastic solids with material interfaces and cracks are considered. The corresponding system of hyperbolic partial differential equations is numerically solved with an explicit finite volume scheme. …
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Muon pair production in electron-proton collisions
Events containing pairs of isolated muons at high invariant masses have been detected at HERA with the H1 detector in a data sample corresponding to an integrated luminosity of 70.9 1/pb of electron(positron)-proton scattering at centre of mass energies of 318 GeV. The results are well described by …
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Numerische Untersuchung zur Aeroelastik dünner Platten
Numerical simulations of nonlinear elastic plates in transonic Euler and Navier-Stokes flows are presented. Von Kármán and Reissner-Mindlin type plate equations are applied to model the plate dynamics. The DLR FLOWer code is used to compute the flow field, while two independent structural methods, …
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Pulsed Laser Deposition von Er:ZBLAN-Schichten für den Aufbau eines integrierten Wellenleiterlasers im grünen Spektralbereich
A production of laser active Er:ZBLAN thin films (1um) with pulsed laser deposition (PLD) on MgF2 substrates is presented in this dissertation. Er:ZBLAN films with low droplet density (<10 per 100x100um2) were produced with PLD for the first time. Optical properties (absorption- and emmision …
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Entwicklung eines automatischen Gitterdeformationsalgorithmus zur Strömungsberechnung um komplexe Konfigurationen auf Hexaeder-Netzen
Topic of the Thesis is the automation and the efficiency increase of a new algorithm for the deformation of computational grids for numerical fluid flow simulation and its application to complex configurations. At the beginning an analysis of different methods for grid deformation, that are …
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Thermodynamik von Fullerenen aus statistisch mechanischen Rechnungen
In this work phase equillibrium calculations between solid, liquid and gaseous phases of higly symmetrical many center molecules and fullerenes are presented. The calculations are performed on a theoretical model basis: For the liquid and gaseous side virial-expansion and pertubation theory are …
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Measurement of the proton structure function F 2 at low kappa and low Q 2 with H 1 detector at HERA
A measurement of the proton structure function F_2(x,Q^2) with four-momentum transfer squared Q^2 between 0.08 GeV^2 and 0.35 GeV^2 and with Bjorken x in the range of 1.2*10^-6<x<5.8*10^-5 is presented. The analysis is based on data recorded in the end of 1999 by the H1 detector at the HERA ep …
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Jets in photoproduction at HERA
Dijet and three-jet cross sections as functions of various jet observables are measured in photoproduction using the H1 detector at HERA. The data sample comprises e + p data collected from 1995-97 with an integrated luminosity of 34.9 pb -1. Jets are found using the inclusive k algorithm with a …
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Bau einer heizbaren Ultraschalldüse zur mikrowellenspektroskopischen Untersuchung schwerflüchtiger Substanzen im Molekularstrahl
Within the scope of this work a new heatable molecular beam nozzle has been developed which is able to evaporate substances with low vapor pressure. With this nozzle low vapor pressure substances can be measured with the high resolution and high sensitivity of the molecular beam Fouriertransform …
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Suche nach Kontakt-Wechselwirkungen und Gravitoneffekten in der tief-inelastischen Streuung bei HERA
Neutral current events in deep inelastic scattering at HERA taken with the H1 detector are examined with respect to standard model expectations. The measured inclusive cross section ds/dQ2 for Q2>200 GeV2 in reactions e±p-->e±X is analysed in terms of contact interactions or graviton effects in …
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Beeinflussung viskoser Strömungseffekte in Hyperschall-Einläufen
For the performance of air-breathing hypersonic space planes, the proper design of the inlet system is of great importance. One of the dominating flow phenomena inside such hypersonic inlets is the mutual interaction of oblique shocks with boundary layers, often leading to a separation of the …
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Untersuchung der Relaxation elastischer Spannungen durch Helium-Implantation und thermische Behandlung in Si 1-x Ge x / Si-Heterostrukturen
The present work is investigating the relaxation of elastic stresses in Si1-xGex/Si-heterostructures after helium implantation and thermal annealing. Particular attention is directed onto the interplay of helium diffusion and the nucleation and movement of dislocation loops leading to the …
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Einspieluntersuchungen von Verbundwerkstoffen mit periodischer Mikrostruktur
In the present work, the shakedown behaviour of composite materials with periodic microstructure is investigated. For this, a general static shakedown theorem is given and proven taking into account the effects of limited linear kinematical hardening and plastic ductile damage. A general procedure …
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Numerische Untersuchung abgelöster Düsenströmungen
The numerical investigation of nozzle flows is introduced as an alternative and addition to the experiment. In the beginning, an overview of today's understanding of separated nozzle flow is given. Before the problem is attacked numerically, the computational method used is described in detail and …
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Ein Messsystem zur Bestimmung von Partikeltemperaturen in Druckkohlenstaubflammen
The subject of this work is the design of a measuring system for determining particle temperatures in a pressurised pulverised coal combustion chamber. Method of measurement is the two colour pyrometrie. Particles heat radiation is collected with a glass fibre and detected in an optical unit. Data …
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