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Search Results: 1 - 10 of 198170 matches for " Tripolt N "
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Diabetes mellitus und endotheliale Dysfunktion
Tripolt N,Sourij H
Journal für Klinische Endokrinologie und Stoffwechsel , 2010,
Abstract: Diabetes mellitus Typ 2 betrifft heute bereits ca. 300 Millionen Menschen weltweit und die Prognosen für die n chsten Jahre sagen noch einen deutlichen Anstieg voraus. Das Risiko für kardiovaskul re Ereignisse ist bei Typ-2-Diabetikern deutlich gesteigert und stellt somit die Haupttodesursache in diesem Patientenkollektiv dar. Die endotheliale Dysfunktion ist eine frühe Stufe auf dem Weg zum atherothrombotischen Ereignis und ein potenziell reversibler Zustand. Dieser Artikel soll einen überblick über die Pathogenese, die M glichkeiten der Messung sowie die therapeutischen Optionen zur Verbesserung der Endothelfunktion bei Diabetikern geben.
Flow equations for spectral functions at finite external momenta
Ralf-Arno Tripolt,Lorenz von Smekal,Jochen Wambach
Physics , 2014, DOI: 10.1103/PhysRevD.90.074031
Abstract: In this work we study the spatial-momentum dependence of mesonic spectral functions obtained from the quark-meson model using a recently proposed method to calculate real-time observables at finite temperature and density from the Functional Renormalization Group. This non-perturbative method is thermodynamically consistent, symmetry-preserving and based on an analytic continuation from imaginary to real time on the level of the flow equations for 2-point functions. Results on the spatial-momentum dependence of the pion and sigma spectral function are presented at different temperatures and densities, in particular near the critical endpoint in the phase diagram of the quark-meson model.
Spectral functions from the functional renormalization group at finite temperature and density
Ralf-Arno Tripolt,Nils Strodthoff,Lorenz von Smekal,Jochen Wambach
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.09.061
Abstract: We present a viable method to obtain real-time quantities such as spectral functions or transport coefficients at finite temperature and density within a non-perturbative Functional Renormalization Group approach. Our method is based on a thermodynamically consistent truncation of the flow equations for 2-point functions with analytically continued frequency components in the originally Euclidean external momenta. We demonstrate its feasibility by calculating the mesonic spectral functions in the quark-meson model at different temperatures and quark chemical potentials, in particular around the critical endpoint in the phase diagram of the model.
Finite-Temperature Spectral Functions from the Functional Renormalization Group
Ralf-Arno Tripolt,Nils Strodthoff,Lorenz von Smekal,Jochen Wambach
Physics , 2013,
Abstract: We present a method to obtain spectral functions at finite temperature from the Functional Renormalization Group. Our method is based on a thermodynamically consistent truncation of the flow equations for 2-point functions with analytically continued frequency components in the originally Euclidean external momenta. For the uniqueness of this continuation at finite temperature we furthermore implement the physical Baym-Mermin boundary conditions. Results are presented for mesonic spectral functions obtained from a two-flavor quark-meson model.
Spectral Functions for the Quark-Meson Model Phase Diagram from the Functional Renormalization Group
Ralf-Arno Tripolt,Nils Strodthoff,Lorenz von Smekal,Jochen Wambach
Physics , 2013, DOI: 10.1103/PhysRevD.89.034010
Abstract: We present a method to obtain spectral functions at finite temperature and density from the Functional Renormalization Group. Our method is based on a thermodynamically consistent truncation of the flow equations for 2-point functions with analytically continued frequency components in the originally Euclidean external momenta. For the uniqueness of this continuation at finite temperature we furthermore implement the physical Baym-Mermin boundary conditions. We demonstrate the feasibility of the method by calculating the mesonic spectral functions in the quark-meson model along the temperature axis of the phase diagram, and at finite quark chemical potential along the fixed-temperature line that crosses the critical endpoint of the model.
The Effect of Fluctuations on the QCD Critical Point in a Finite Volume
Ralf-Arno Tripolt,Jens Braun,Bertram Klein,Bernd-Jochen Schaefer
Physics , 2013, DOI: 10.1103/PhysRevD.90.054012
Abstract: We investigate the effect of a finite volume on the critical behavior of the theory of the strong interaction (QCD) by means of a quark-meson model for two quark flavors. In particular, we analyze the effect of a finite volume on the location of the critical point in the phase diagram existing in our model. In our analysis, we take into account the effect of long-range fluctuations with the aid of renormalization group techniques. We find that these quantum and thermal fluctuations, absent in mean-field studies, play an import role for the dynamics in a finite volume. We show that the critical point is shifted towards smaller temperatures and larger values of the quark chemical potential if the volume size is decreased. This behavior persists for antiperiodic as well as periodic boundary conditions for the quark fields as used in many lattice QCD simulations.
Spectral Functions from the Functional Renormalization Group
Jochen Wambach,Ralf-Arno Tripolt,Nils Strodthoff,Lorenz von Smekal
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.04.027
Abstract: In this article we wish to present a new method to obtain spectral functions at finite temperature and density from the Functional Renormalization Group (FRG). The FRG offers a powerful non-perturbative tool to deal with phase transitions in strong-interaction matter under extreme conditions and their fluctuation properties. Based on a thermodynamically consistent truncation we derive flow equations for pertinent two-point functions in Minkowski space-time. We demonstrate the feasibility of the method by calculating mesonic spectral functions in hot and dense hadronic matter using the quark-meson model as a simple example.
Implementation of a Higher Quality dc Power Converter  [PDF]
N. N. Barsoum
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.22012
Abstract: Many single and three-phase converters are well developed, and covered up in most of electric markets. It is used in many applications in power systems and machine drives. However, an exact definite output signal from the dc side still not recognized. The waveforms of output voltage and current demonstrate an imperfect dc signal and constitute losses, harmonic distortion, low power factor, and observed some ripples. An approximately perfect rectifier bridge is the aim of this research. Perhaps it gives the ability to identify the parameters of the converter to obtain, as much as possible, a perfect dc signal with less ripple, high power factor and high efficiency. Design is implemented by simulation on Power Simulator PSIM, and practically, a series regulator LM723 is applied to provide regulating output voltage. Comparisons of both simulation and hardware results are made to observe differences and similarities.
Estimation of Sensitivity of the DS/AHP Method While Solving Foresight Problems with Incomplete Data  [PDF]
N. Pankratova, N. Nedashkovskaya
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.41011
Abstract:

The paper provides mathematical analysis of sensitivity of different combination rules in the DS/AHP method when an alternative is added to the set of decision alternatives while solving foresight problems. Different cases of rank reversals are defined and two sets of conditions for these cases using the method DS/AHP are considered. Rank reversals are illustrated when the DS/AHP method is used to solve practical problem of critical technologies of energy conservation and power efficiency evaluation in Ukraine. It is shown that the DS/AHP method is not sensitive to exclusion (or addition) of an irrelevant decision alternative from (or to) the set of decision alternatives.

Computation of the Genetic Code: Full Version  [PDF]
N. N. Kozlov
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.510008
Abstract: One of the problems in the development of mathematical theory of the genetic code (summary is presented in [1], the detailed—to [2]) is the problem of the calculation of the genetic code. Similar problem in the world is unknown and could be delivered only in the 21st century. One approach to solving this problem is devoted to this work. For the first time a detailed description of the method of calculation of the genetic code was provided, the idea of which was first published earlier [3]), and the choice of one of the most important sets for the calculation was based on an article [4]. Such a set of amino acid corresponds to a complete set of representation of the plurality of overlapping triple gene belonging to the same DNA strand. A separate issue was the initial point, triggering an iterative search process all codes submitted by the initial data. Mathematical analysis has shown that the said set contains some ambiguities, which have been founded because of our proposed compressed representation of the set. As a result, the developed method of calculation was reduced to two main stages of research, where at the first stage only single-valued domains were used in the calculations. The proposed approach made it possible to significantly reduce the amount of computation at each step in this complex discrete structure.
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