• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 9
  • 3
  • 2
  • 2
  • 2
  • 1
  • Tagged with
  • 17
  • 5
  • 4
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 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.
11

Návrh databáze pro připojení systému SAP jako zdroje dat pro webovou aplikaci / Database design for connecting SAP as a data source for a Web application

MARHOUN, Lukáš January 2016 (has links)
The thesis deals with connecting SAP ERP system via local database system MS SQL Server using the tools SAP BI, data synchronization between systems and advanced usage of T-SQL language for preparing data for web applications and reports written in PHP. The thesis contains a brief overview of the SAP system and the possibility of connecting to the SAP system. The general principles of described solution can be used in conjunction with other systems and programming languages.
12

Die Neuausrichtung der Bundeswehr – Position und Opposition

Bald, Detlef, Scheler, Wolfgang, Schreiber, Wilfried, Sylla, Horst, Woit, Ernst 13 May 2019 (has links)
Reformstau 1969 und 2010, Bw-Reformkonzept, Bundeswehr und außenpolitische Handlungsfähigkeit Deutschlands, Armee im Einsatz, Berufsarmee, Struktur und Ausrüstung der Bundeswehr, internationale Dimension, sicherheitspolitische Reformalternativen.:Autorenbeiträge: Detlef Bald, Chancen für eine große Reform? Zur Legitimation der Militärreform 2010. Wolfgang Scheler, Der neue Auftrag der Bundeswehr und die Frage seiner Legitimation. Ernst Woit Der professionelle Kämpfer als neues Leitbild der Bundeswehr. Arbeitskreis Darmtädter Signal, Positionspapier des Arbeitskreises Darmstädter Signal (AkDS) zur Bundeswehrreform der Regierung Merkel. Wilfried Schreiber, Thesen: Zur internationalen Dimension der Neuausrichtung der Bundeswehr. Ansätze für eine alternative Sicherheitspolitik.
13

Approximating Probability Distributions Using Moments

Davis, Charles Shaw 04 1900 (has links)
<p> We study the problem of finding approximate significance points of random variables whose exact distributions are unknown or extremely complicated . We consider the case where at least the first three moments, and possibly the lower or upper endpoint of the distribution are known. </p> <p> The methods of approximation studied include the Johnson system of transformations, Pearson curves, Pearson curves with known lower terminal, Cornish-Fisher expansions and the approximation a+bW, where W is chi-squared with p degrees of freedom . A new three-moment approximation of the form (cW)^k, with W as defined above, is also considered. These methods of approximation are discussed, with special attention to fitting procedures and computer implementation. </p> <p> The methods of approximation are compared, with respect to ease of application and accuracy of approximation, over a wide variety of exact distributions. The accuracy of each approximation is discussed and guidelines are given for determining which of several approximations should be used in a particular case. </p> / Thesis / Master of Science (MSc)
14

Níveis profundos associados a vacância e nitrogênio em diamante / Deep levels associated with vacancy and nitrogen in diamond

Alves, Horacio Wagner Leite 05 July 1985 (has links)
Neste trabalho estudamos a estrutura eletrônica de defeitos pontuais em diamante , os quais introduzem níveis profundos na faixa proibida deste material. Utilizamos o modelo de aglomerado molecular dentro de dois formalismos: o Método do Espalhamento Múltiplo X (MS- X), que é um método de primeiros princípios e o método \"Complete Neglect of Differential Overlap\" (CNDO/ BW), que é semi-empírico. Foi empregado um tratamento adequado para os orbitais de superfície em cada um dos dois formalismos . Foram estudados dois sistemas: o Nitrogênio substitucional e a vacância simples. Para o Nitrogênio, analisamos as possíveis distorções associadas a este centro, procurando interpretar os resultados experimentais. A vacância simples mostrou-se ser um sistema bastante semelhante à vacância simples em Silício: em ambos os casos observa - se uma distorção Jahn-Teller. O modelo adotado mostrou- se capaz de descrever satisfatoriamente as estruturas eletrônicas dos dois centros estudados, fornecendo resultados quantitativos que são comparados com a experiência . / In this work we studied the electronic structure of point defects in diamond. To do this we used the molecular cluster model within two formalisms: the first-principles X Scattered wave method MS-X ) and the semiempirical Complete Neglect of Differential Overlap (CNOO/BW) method. In each case, an adequate surface orbitals treatment was utilized. We studied the following systems: the substitutional Nitrogen and the simple neutral vacancy. For the substitutional Nitrogen. We analyzed the possible distortion related to this center trying to interprete the experimental results. For the simple neutral vacancy in diamond. The results showed to be similar to the simple Silicon vacancy picture: In both cases we observed a Jahn-Teller distortion (lowering the symmetry of the center). The adopted model showed to be able to describe satisfactorily their electronic structures, and quantitative results are given, which are compared with the experimental data.
15

Níveis profundos associados a vacância e nitrogênio em diamante / Deep levels associated with vacancy and nitrogen in diamond

Horacio Wagner Leite Alves 05 July 1985 (has links)
Neste trabalho estudamos a estrutura eletrônica de defeitos pontuais em diamante , os quais introduzem níveis profundos na faixa proibida deste material. Utilizamos o modelo de aglomerado molecular dentro de dois formalismos: o Método do Espalhamento Múltiplo X (MS- X), que é um método de primeiros princípios e o método \"Complete Neglect of Differential Overlap\" (CNDO/ BW), que é semi-empírico. Foi empregado um tratamento adequado para os orbitais de superfície em cada um dos dois formalismos . Foram estudados dois sistemas: o Nitrogênio substitucional e a vacância simples. Para o Nitrogênio, analisamos as possíveis distorções associadas a este centro, procurando interpretar os resultados experimentais. A vacância simples mostrou-se ser um sistema bastante semelhante à vacância simples em Silício: em ambos os casos observa - se uma distorção Jahn-Teller. O modelo adotado mostrou- se capaz de descrever satisfatoriamente as estruturas eletrônicas dos dois centros estudados, fornecendo resultados quantitativos que são comparados com a experiência . / In this work we studied the electronic structure of point defects in diamond. To do this we used the molecular cluster model within two formalisms: the first-principles X Scattered wave method MS-X ) and the semiempirical Complete Neglect of Differential Overlap (CNOO/BW) method. In each case, an adequate surface orbitals treatment was utilized. We studied the following systems: the substitutional Nitrogen and the simple neutral vacancy. For the substitutional Nitrogen. We analyzed the possible distortion related to this center trying to interprete the experimental results. For the simple neutral vacancy in diamond. The results showed to be similar to the simple Silicon vacancy picture: In both cases we observed a Jahn-Teller distortion (lowering the symmetry of the center). The adopted model showed to be able to describe satisfactorily their electronic structures, and quantitative results are given, which are compared with the experimental data.
16

Implicit Least Squares Kinetic Upwind Method (LSKUM) And Implicit LSKUM Based On Entropy Variables (q-LSKUM)

Swarup, A Sri Sakti 07 1900 (has links)
With increasing demand for computational solutions of fluid dynamical problems, researchers around the world are working on the development of highly robust numerical schemes capable of solving flow problems around complex geometries arising in Aerospace engineering. Also considerable time and effort are devoted to development of convergence acceleration devices, for reducing the computational time required for such numerical solutions. Reduction in run times is very vital for production codes which are used many times in design cycle. In this present work, we consider a numerical scheme called LSKUM capable of operating on any arbitrary distribution of points. LSKUM is being used in CFD center (IIsc) and DRDL (Hyderabad) to compute flows around practical geometries and presently these LSKUM based codes are explicit- It has been observed already by the earlier researchers that the explicit schemes for these methods are robust. Therefore, it is absolutely essential to consider the possibility of accelerating explicit LSKUM by making it LSKUM-Implicit. The present thesis focuses on such a study. We start with two kinetic schemes namely Least Squares Kinetic Upwind Method (LSKUM) and LSKUM based on entropy variables (q-LSKUM). We have developed the following two implicit schemes using LSKUM and q-LSKUM. They are (i)Non-Linear Iterative Implicit Scheme called LSKUM-NII. (ii)Linearized Beam and Warming implicit Scheme, called LSKUM-BW. For the purpose of demonstration of efficiency of the newly developed above implicit schemes, we have considered flow past NACA0012 airfoil as a test example. In this regard we have tested these implicit schemes for flow regimes mentioned below •Subsonic Case: M∞ = 0.63, a.o.a = 2.0° •Transonic Case: M∞ = 0.85, a.o.a = 1.0° The speedup of the above two implicit schemes has been studied in this thesis by operating them on different grid sizes given below •Coarse Grid: 4074 points •Medium Grid: 8088 points •Fine Grid: 16594 points The results obtained by running these implicit schemes are found to be very much encouraging. It has been observed that these newly developed implicit schemes give as much as 2.8 times speedup compared to their corresponding explicit versions. Further improvement is possible by combining LKSUM-Implicit with modern iterative methods of solving resultant algebraic equations. The present work is a first step towards this objective.
17

Trajectory and channeling effects in the scattering of ions off a metal surface - Probing the electronic density corrugation at a surface by grazing axial ion channeling

Robin, Abel 25 November 2003 (has links)
The presented work investigates planar and axial channeling effects in ion-surface collisions. Therefore, energy loss and charge state distributions depending on the crystalline surface direction are recorded and analyzed. Several additional scattering parameters, like the primary energy, the outgoing charge state, the scattering angle, and the angle of incidence are varied. Multi-peak structures in the energy spectra are observed under axial channeling conditions and attributed to different trajectory classes. Using combined trajectory and inelastic energy loss calculations we are able to unambiguously assign the different peaks in the energy spectra to the different types of trajectories found in the calculations. By this, we investigate the electronic density corrugation at different metal surfaces. Die vorliegende Arbeit untersucht den Einfluß von axialem und planarem Channeling auf den Energieverlust von oberflächengestreuten Ionen. Es werden Energieverlustspektren und Ladungsverteilungen in Abhängigkeit der Parameter Primärenergie, gestreuter Ladungszustand, Streuwinkel, Einfallswinkel und der azimuthalen Ausrichtung der Oberfläche gemessen. Im Fall von axialem Channeling beobachten wir in den Energiespektren eine Multi-Peak Struktur. Diese läßt sich auf unterschiedliche Teilchentrajektorien zurückführen. Zusammen mit theoretischen Berechnungen des inelastischen Energieverlustes kann eine eindeutige Zuordnung zwischen dem gemessenen Energieverlust und der dazugehörigen Trajektorienart gemacht werden. Diese Technik erlaubt es uns, die elektronische Dichtekorrugation an Oberflächen zu studieren.

Page generated in 0.0171 seconds