200,531 research outputs found
John Mandel interview
No full textInterview with John Mandel, a survivor of Nazi Holocaust of the Jews, by Charlene Green. The transcript is prepared from the interview and European spellings regularized for consistency.An interview with John Mandel, a Holocaust survivor, conducted by Charlene Green. John Mandel was born in 1927? in Munkacs, Czechoslovakia. After the Hungarian annexation of the area in 1938, John and his family suffered increasing persecution in the Hungarian regime. The family was deported to Birkenau in May 1944. John's mother, sister and two younger brothers were gassed upon arrival and John was separated from his father and another brother when he was transferred to Auschwitz I. After about seven months in Auschwitz I, John was transferred to Mauthausen then to Melk and finally to Ebensee (both sub-camps of Mauthausen), where he was liberated by the American Army in spring, 1945. After liberation, John went to the Displaced Persons Camp at Gabersee and in 1946, he emigrated to the United States.https://deepblue.lib.umich.edu/bitstream/2027.42/50625/3/mandel4.wavhttps://deepblue.lib.umich.edu/bitstream/2027.42/50625/4/mandel3.wavhttps://deepblue.lib.umich.edu/bitstream/2027.42/50625/5/mandel2.wavhttps://deepblue.lib.umich.edu/bitstream/2027.42/50625/6/mandel1.wavhttps://deepblue.lib.umich.edu/bitstream/2027.42/50625/8/Mandel.pd
Generalized Lins-Mandel spaces and branched coverings of S3
No full textLins-Mandel spaces are 3-manifolds represented by "highly-symmetric" edge-coloured graphs. The paper describes the topological structure of Lins-Mandel spaces in terms of branched coverings of the 3-sphere and illustrates generalizations of these spaces
Phase-unlocked Hong-Ou-Mandel interferometry
No full textThere is a fundamental dimensional mismatch between the Hong-Ou-Mandel (HOM) interferometer and two-photon (2P) states: while the latter are represented using two temporal (or spectral) dimensions, the HOM interferometer allows access to only one temporal dimension. We introduce a linear 2P interferometer containing two independent delays spanning the 2P state. By “unlocking” the fixed phase relationship between the interfering 2P probability amplitudes in a HOM interferometer, one of these probability amplitudes now serves as a delay-free 2P reference against which the other beats, thereby resolving ambiguities in 2P state identification typical of HOM interferometry and extending its utility to a large family of 2P states
Influence of channel mixing in fermionic Hong-Ou-Mandel experiments
No full textWe consider an electronic Hong-Ou-Mandel interferometer in the integer quantum Hall regime, where the colliding electronic states are generated by applying voltage pulses (creating for instance levitons) to ohmic contacts. The aim of this work is to investigate possible mechanisms leading to a reduced visibility of the Pauli dip, i.e., the noise suppression expected for synchronized sources. It is known that electron-electron interactions cannot account for this effect and always lead to a full suppression of the Hong-Ou-Mandel noise. Focusing on the case of filling factor ?=2, we show instead that a reduced visibility of the Pauli dip can result from mixing of the copropagating edge channels, arising from tunneling events between them
Hong-Ou-Mandel characterization of multiply charged Levitons
No full textWe review and develop recent results regarding Leviton excitations generated in topological states of matter – such as integer and fractional quantum Hall edge channels – and carrying a charge multiple of the electronic one. The peculiar features associated with these clean and robust emerging excitations can be detected through current correlation measurements. In particular, relevant information can be extracted from the noise signal in generalized Hong-Ou-Mandel experiments, where Levitons with different charges collide against each other at a quantum point contact. We describe this quantity both in the framework of the photo-assisted noise formalism and in terms of a very interesting and transparent picture based on wave-packet overlap
Periodic solutions to a cahn hilliard willmore equation in the plane
No full textIn this paper we construct entire solutions to the phase field equation of Willmore type in the Euclidean plane, where W(u) is the standard double-well potential . Such solutions have a non-trivial profile that shadows a Willmore planar curve, and converge uniformly to as . These solutions give a counterexample to the counterpart of Gibbons' conjecture for the fourth-order counterpart of the Allen-Cahn equation. We also study the x (2)-derivative of these solutions using the special structure of Willmore's equation.Project Geometric Variational Problems from Scuola Normale Superiore
MIUR Bando PRIN
2015KB9WPT001
Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)
MA 6290/2-1
Fondo Basal CMM-Chile
Fondecyt
317011
Multi-step estimators of the between-study variance: A new relationship with the Paule-Mandel estimator
No full textA wide variety of estimators of the between-study variance are available in random-effects meta-analysis. Many, but not all, of these estimators are based on the method of moments. The DerSimonian-Laird estimator is widely used in applications, but the Paule-Mandel estimator is an alternative that is nowadays recommended to be used. Recently, DerSimonian and Kacker have developed two-step moment based estimators. We extend these two-step estimators so that multiple (more than two) steps are used. We establish the surprising result that multi-step estimators tend towards the Paule-Mandel estimator as the number of steps becomes large. Hence, the iterative scheme underlying our new multi-step estimator provides a hitherto unknown relationship between the two-step estimators and Paule-Mandel estimator. Our analysis suggests that two-step estimators are not necessarily distinct estimators in their own right, instead they are quantities that are closely related to the the usual iterative scheme that is used to calculate the Paule-Mandel estimate. Two-step estimators are perhaps best conceptualized as approximate Paule-Mandel estimators
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