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Search Results: 1 - 10 of 118096 matches for " T. Lehner "
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Numerical simulation of a macroscopic quantum-like experiment: oscillating wave packet
L. Nottale,T. Lehner
Physics , 2006,
Abstract: We simulate the transformation of a classical fluid into a quantum-like (super)-fluid by the application of a generalized quantum potential through a retro-active loop. This numerical experiment is exemplified in the case of a non-spreading oscillating wave packet in a harmonic potential. We find signatures of a quantum-like behavior which are stable against various perturbations.
Character expansion method for supergroups and extended superversions of the Leutwyler-Smilga and Berezin-Karpelevich integrals
C. Lehner,T. Wettig,T. Guhr,Y. Wei
Physics , 2008, DOI: 10.1063/1.2940572
Abstract: We introduce an extension of the character expansion method to the case of supergroups. This method allows us to calculate a superversion of the Leutwyler-Smilga integral which, to the best of our knowledge, has not been calculated before. We also use the method to generalize a previously calculated superversion of the Berezin-Karpelevich integral. Our character expansion method should also allow for the calculation of other supergroup integrals.
Evaluation of process management of postpartum hemorrhage due to uterine atony  [PDF]
Iris Holzer, Rainer Lehner
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.37093

Objective: To evaluate the management process and the guidelines for management of postpartum hemorrhage due to uterine atony at the General Hospital Vienna, Medical University Vienna. Material and Methods: A retrospective analysis was carried out on all 24 cases of postpartum hemorrhage due to uterine atony with an estimated blood loss of more than 800 mL, in which standardized guidelines were obtained. We included all women who gave birth at the General Hospital of Vienna, the Medical University Vienna, during the period from January 1st 2003 and December 31st 2009 and who suffered blood loss 800 mL at minimum due to uterine atony. Results: The guidelines were in use for 14% - 71%. The average blood loss of the 24 cases with uterine atony was 1342 mL. Conclusion: The management process of postpartum hemorrhage due to uterine atony deviates from the hospital’s guidelines in many cases.

Implications of Organ Allocation on Waitlist Time for Liver Transplantation in Children and Adolescents – Review on the Past 10 Years in the Eurotransplant Region
E.-D. Pfister,T. Becker,F. Lehner,U. Baumann
Transplantationsmedizin , 2011,
Abstract: Liver transplantation (LTx) has developed into an established therapy also in children and adolescents. In pediatric patients, numbers of transplantations, age distribution of patients as well as underlying diseases for LTx have remained constant since many years and there is also no increase to be expected as to the indications for pediatric LTx. Whereas splitting of livers, an established surgical therapy modality to provide two recipients with a new organ, is not performed in all divisable organs, mortality of children waiting for a liver transplant remains a critical topic. Waitlist time of a maximum of 3 months as required by law is largely exceeded. In the medium term, we cannot abstain from a split liver transplant program in order to provide adequate care for terminally ill pediatric liver patients and to optimally use divisable donor organs. Therefore, models of cooperation between centres with and without split organ programs have to be developed and sufficient time, staff and financial resources have to be dedicated to this project.
GENTLE/4fan - A package of Fortran programs for the description of e+ e- annihilation into four fermions
D. Bardin,D. Lehner,A. Leike,T. Riemann
Physics , 1996,
Abstract: We describe the program package gentle/4fan, which consists of the Fortran codes gentle\_4fan.f, 4fan.f, and gentle\_nc\_qed.f and is devoted to the description of e+ e- annihilation into four fermions. The codes are based on the semi-analytical approach. Initial state QED corrections are taken into account. The program versions, which are described here were used in the 1995 workshop `Physics at LEP~2'.
Topology and chiral random matrix theory at nonzero imaginary chemical potential
C. Lehner,M. Ohtani,J. J. M. Verbaarschot,T. Wettig
Physics , 2009, DOI: 10.1103/PhysRevD.79.074016
Abstract: We study the effect of topology for a random matrix model of QCD at nonzero imaginary chemical potential or nonzero temperature. Non-universal fluctuations of Dirac eigenvalues lead to normalization factors that contribute to the $\theta$-dependence of the partition function. These normalization factors have to be canceled in order to reproduce the $\theta$-dependence of the QCD partition function. The reason for this behavior is that the topological domain of the Dirac spectrum (the region of the Dirac spectrum that is sensitive to the topological charge) extends beyond the microscopic domain at nonzero imaginary chemical potential or temperature. Such behavior could persist in certain lattice formulations of QCD.
Semi-Analytical Approach to Four-Fermion Production in $e^+ e^-$ Annihilation
D. Bardin,M. Bilenky,D. Lehner,A. Olchevski,T. Riemann
Physics , 1994, DOI: 10.1016/0920-5632(94)90670-X
Abstract: A study of the semi-analytical approach to four-fermion production in $e^+ e^-$ annihilation is presented. We classify all possible four-fermion final states and present results of new calculations for the `basic' processes with the $WW,ZZ$, and $ZH$ off-shell production together with some examples of `background' processes. The Initial State Radiative corrections are included for the basic processes. Several numerical examples are given in the energy range from LEP2 up to $\sqrt{s}=1$ TeV.
Semi-Analytical Approach to Off-Shell W and Z Pair Production
D. Bardin,D. Lehner,A. Leike,T. Riemann
Physics , 1996,
Abstract: We give a short review of the results for four fermion production, which have been obtained by the semi-analytical approach. The angular degrees of freedom (typically five or more) are integrated over analytically while the integrations over invariant fermion pair masses (typically two or more) remain to be performed by numerical methods. In addition to doubly resonating cross sections from virtual two boson production, QED corrections and background contributions were determined. However, a large variety of final state topologies has not been treated so far.
Evidence of a cyclonic regime in a precessing cylindrical container
W. Mouhali,T. Lehner,J. Léorat,R. Vitry
Physics , 2014,
Abstract: We report experimental observations obtained by particule image velocimetry (PIV) of the behavior of a flow driven by rotation and precession of a cylindrical container. Various hydrodynamical regimes are identified according to the value of the control parameter which is the ratio of the precession frequency to the rotation frequency. In particular when this parameter is increased from small values, we have observed an induced differential rotation followed by the apparition of permanent cyclonic vortices.
The normal distribution is $\boxplus$-infinitely divisible
Serban T. Belinschi,Marek Bozejko,Franz Lehner,Roland Speicher
Mathematics , 2009, DOI: 10.1016/j.aim.2010.10.025
Abstract: We prove that the classical normal distribution is infinitely divisible with respect to the free additive convolution. We study the Voiculescu transform first by giving a survey of its combinatorial implications and then analytically, including a proof of free infinite divisibility. In fact we prove that a subfamily Askey-Wimp-Kerov distributions are freely infinitely divisible, of which the normal distribution is a special case. At the time of this writing this is only the third example known to us of a nontrivial distribution that is infinitely divisible with respect to both classical and free convolution, the others being the Cauchy distribution and the free 1/2-stable distribution.
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