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Search Results: 1 - 10 of 146385 matches for " B. Hansen "
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Numerical Investigation of the System-Matrix Method for Higher-Order Probe Correction in Spherical Near-Field Antenna Measurements
Thorkild B. Hansen
International Journal of Antennas and Propagation , 2012, DOI: 10.1155/2012/493705
Abstract: The system-matrix method for higher-order probe correction in spherical near-field scanning is based on a renormalized least-squares approach in which the normal matrix closely resembles the identity matrix when most of the energy of the probe pattern resides in the first-order modes. This method will be “stressed-tested” in the present paper by employing probes for which up to 49% of the pattern energy resides in the higher-order modes. The condition number of the resulting normal matrix will be computed, and its “distance” from the identity matrix displayed. It is also shown how the condition number of the normal matrix can be further reduced.
Correlation and Capacity Calculations with Reference Antennas in an Isotropic Environment
Thorkild B. Hansen
International Journal of Antennas and Propagation , 2012, DOI: 10.1155/2012/540649
Abstract: A reverberation chamber is a convenient tool for over-the-air testing of MIMO devices in isotropic environments. Isotropy is typically achieved in the chamber through the use of a mode stirrer and a turntable on which the device under test (DUT) rides. The quality of the isotropic environment depends on the number of plane waves produced by the chamber and on their spatial distribution. This paper investigates how the required sampling rate for the DUT pattern is related to the plane-wave density threshold in the isotropic environment required to accurately compute antenna correlations. Once the plane-wave density is above the threshold, the antenna correlation obtained through isotropic experiments agrees with the antenna correlation obtained from the classical definition, as has been proven theoretically. This fact is verified for the good, nominal, and bad reference antennas produced by CTIA. MIMO channel capacity simulations are performed with a standard base station model and the DUT placed in a single-tap plane-wave reverberation chamber model. The capacity curves obtained with the good, nominal, and bad reference antennas are clearly distinguishable.
Danielsen: Edb i hverdagen / Caprani & Sandemose: Datahjemmet / Jacobsen: Edb-teknologi-samfund 1-4 / Holst m.fl.: N.I.T - problem og l sning / Andersen m.fl.: Edb i gymnasiet / Obel m.fl.: Grundkursus i Datal re / Dybkj r m.fl.: Informatik og data
Svend B?gh Hansen
MedieKultur : Journal of Media and Communication Research , 1986,
Abstract:
Asynkron e-l ring: Skriften p nettet?
Stig B?rsen Hansen
Dansk Universitetspaedagogisk Tidsskrift , 2008,
Abstract: Indl ggets to f rste afsnit pr senterer Marx som ophav til en meget indflydelsesrig tradition inden for teknologifilosofien. Dern st vises, hvordan Marx’ analyse af teknologi kan bidrage til belysningen af IT-baserede l reprocesser, hvor der her fokuseres p asynkron e-l ring. For det f rste fremh ves teknologiens centrale rolle i et mods tningsfyldt forhold mellem brugere af teknologi og arbejdsgivere. Forestillingen om en konomisk motiveret deprofessionalisering er her central. Dern st stilles der med udgangspunkt i Langdon Winners t nkning sp rgsm lstegn ved den opfattelse af teknologisk udvikling, der ofte synes at ligge til grund for diskussionen af IT p universiteterne.
If You Know Something, Say Something: Young Children's Problem with False Beliefs
Mikkel B. Hansen
Frontiers in Psychology , 2010, DOI: 10.3389/fpsyg.2010.00023
Abstract: Whether young children understand that others may hold false beliefs is a hotly debated topic in psychology and neuroscience. Much evidence suggests that children do not pass this milestone in their understanding of other people until the age of 5 years. Other evidence suggests that they understand already in their second year. This study proposes a novel account of the logic of conversations about certain mental states. By modifying the discourse accordingly, children passed three false belief tasks at 3 years of age while they failed standard false belief tasks. The results support the view that even young children construe other people in adult-like psychological terms.
Development of a Non-Destructive Evaluation Method (Nde) for Adhesively Bonded Grp Pipe Connections Offshore Développement d'une méthode de contr le non destructif (CND) pour les connections collées de canalisations en PRV en offshore
Boye Hansen A.,Asdal B.
Oil & Gas Science and Technology , 2006, DOI: 10.2516/ogst:1995012
Abstract:
Europeanization and Domestic Parliamentary Adaptation A Comparative Analysis of the Bundestag and the House of Commons
Troels B. Hansen,Bruno Scholl
European Integration Online Papers , 2002,
Abstract: The aim of the article is to explain the institutional development of the parliamentary scrutiny systems in Germany and the UK on the basis of existing Europeanization frameworks. So far these attempts have con-centrated on policy specific analyses or on the development of governmental or administrative structures. There has been no attempt to explicitly link the evolving discussion on the role of national Parliaments and the development of scrutiny structures to the theoretical debate about Europeanization and domestic change. We will apply a strict top down approach taking on board key notions of the Europeanization literature such as misfit, mediating factors or domestic change. However, in order to grasp the various dynamics at work we had to specify the existing frameworks. The rather undefined concept of 'misfit' between the European and national level is divided into three sub-categories: constitutional, functional and cultural misfit. This allows for a more differentiated analysis of how the various mediating factors exerted their influence on the development of the domestic institutions. Drawing on explanatory models from sociological as well as ra-tional choice institutionalism we argue that cultural factors such as the attitude towards European Integra-tion account for the longer term developments of the scrutiny systems whereas formal mediating institutions such as national Governments or Courts are responsible for the more abrupt changes.
Europeanization and Domestic Parliamentary Adaptation A Comparative Analysis of the Bundestag and the House of Commons
Troels B. Hansen,Bruno Scholl
European Integration Online Papers , 2002,
Abstract: The aim of the article is to explain the institutional development of the parliamentary scrutiny systems in Germany and the UK on the basis of existing Europeanization frameworks. So far these attempts have con-centrated on policy specific analyses or on the development of governmental or administrative structures. There has been no attempt to explicitly link the evolving discussion on the role of national Parliaments and the development of scrutiny structures to the theoretical debate about Europeanization and domestic change. We will apply a strict top down approach taking on board key notions of the Europeanization literature such as misfit, mediating factors or domestic change. However, in order to grasp the various dynamics at work we had to specify the existing frameworks. The rather undefined concept of 'misfit' between the European and national level is divided into three sub-categories: constitutional, functional and cultural misfit. This allows for a more differentiated analysis of how the various mediating factors exerted their influence on the development of the domestic institutions. Drawing on explanatory models from sociological as well as ra-tional choice institutionalism we argue that cultural factors such as the attitude towards European Integra-tion account for the longer term developments of the scrutiny systems whereas formal mediating institutions such as national Governments or Courts are responsible for the more abrupt changes.
Extremely Correlated Fermi Liquids: Self consistent solution of the second order theory
Daniel Hansen,B. Sriram Shastry
Physics , 2012, DOI: 10.1103/PhysRevB.87.245101
Abstract: We present detailed results from a recent microscopic theory of extremely correlated Fermi liquids, applied to the t-J model in two dimensions. We use typical sets of band parameters relevant to the cuprate superconductors. The second order theory in the parameter \lambda is argued to be quantitatively valid in the overdoped regime for 0 < n < 0.75 (n is the particle density). The calculation involves the self consistent solution of equations for an auxiliary Fermi liquid type Greens function and an adaptive spectral weight, or caparison factor, described in recent papers by Shastry (Refs. (1) and (5)). We present the numerical results at low as well as high T at various low to intermediate densities in the normal phase with emphasis placed on features that are experimentally accessible. We display the momentum space occupation function m(k), various energy dispersions locating the peaks of spectral functions, the optical conductivity, relaxation rates for quasiparticles, and the electronic spectral functions along various directions in the Brillouin zone, and with typical additional elastic scattering. The line-shapes have an asymmetric shape and a broad background that is seen in experiments near and beyond optimal hole doping, and validate approximate recent recent versions of the theory. The results display features such as the high energy kink, and provide an in depth understanding of its origin and dependence on band parameters.
Memory Effects and Scaling Properties of Traffic Flows
B. -S. Skagerstam,A. Hansen
Physics , 2006, DOI: 10.1209/epl/i2005-10291-y
Abstract: Traffic flows are studied in terms of their noise of sound, which is an easily accessible experimental quantity. The sound noise data is studied making use of scaling properties of wavelet transforms and Hurst exponents are extracted. The scaling behavior is used to characterize the traffic flows in terms of scaling properties of the memory function in Mori-Lee stochastic differential equations. The results obtained provides for a new theoretical as well as experimental framework to characterize the large-time behavior of traffic flows. The present paper outlines the procedure by making use of one-lane computer simulations as well as sound-data measurements from a real two-lane traffic flow. We find the presence of conventional diffusion as well as 1/f-noise in real traffic flows at large time scales.
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