163,983 research outputs found
Intrinsic paramagnetic Meissner effect due to s-wave odd-frequency superconductivity
No full textIn 1933, Meissner and Ochsenfeld reported the expulsion of magnetic flux-the diamagnetic Meissner effect-from the interior of superconducting lead. This discovery was crucial in formulating the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity. In exotic superconducting systems BCS theory does not strictly apply. A classical example is a superconductor-magnet hybrid system where magnetic ordering breaks time-reversal symmetry of the superconducting condensate and results in the stabilization of an odd-frequency superconducting state. It has been predicted that under appropriate conditions, odd-frequency superconductivity should manifest in the Meissner state as fluctuations in the sign of the magnetic susceptibility, meaning that the superconductivity can either repel (diamagnetic) or attract (paramagnetic) external magnetic flux. Here, we report local probe measurements of faint magnetic fields in a Au=Ho=Nb trilayer system using low-energy muons, where antiferromagnetic Ho (4.5 nm) breaks time-reversal symmetry of the proximity-induced pair correlations in Au. From depth-resolved measurements below the superconducting transition of Nb, we observe a local enhancement of the magnetic field in Au that exceeds the externally applied field, thus proving the existence of an intrinsic paramagnetic Meissner effect arising from an odd-frequency superconducting state.Peer reviewe
Karol Meissner. A Doctor and Benedictist
No full textO. Karol Meissner (właściwie Wojciech Meissner) brał udział w powstaniu warszawskim. Był lekarzem, benedyktynem, rozwijał również poradnictwo dotyczące małżeństw i rodziny, współtworzył katolicką naukę dotyczącą podstaw moralnych życia małżeńskiego. Wykładał psychologię na Katolickim Uniwersytecie Medycznym. Działał też na rzecz odbudowy klasztoru benedyktynów w Lubiniu.Friar Karol Meissner took part in the Warsaw uprising. He was a doctor and Benedictin. He was one of the creator of Catholic marriage guidance and family counseling. He was University lecturer at The John Paul II (The Second) Catholic University of Lublin. He taught psychology. He contributed to reconstruction of Benedictines abbey in Lubiń
Profess Meissner and student
No full textPhotograph of School of Science; Physics; Professor Karl W. Meissner; Robert D. Van Veld, Research Associate; August 4, 1955;College of SciencePhysic
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Origin and regenerative potential of vertebrate mechanoreceptor-associated stem cells
No full textWidera D, Hauser S, Kaltschmidt C, Kaltschmidt B. Origin and regenerative potential of vertebrate mechanoreceptor-associated stem cells. Anatomy Research International. 2012;2012:1-9.Meissner corpuscles and Merkel cell neurite complexes are highly specialized mechanoreceptors present in the hairy and glabrous skin, as well as in different types of mucosa. Several reports suggest that after injury, such as after nerve crush, freeze injury, or dissection of the nerve, they are able to regenerate, particularly including reinnervation and repopulation of the mechanoreceptors by Schwann cells. However, little is known about mammalian cells responsible for these regenerative processes. Here we review cellular origin of this plasticity in the light of newly described adult neural crest-derived stem cell populations. We also discuss further potential multipotent stem cell populations with the ability to regenerate disrupted innervation and to functionally recover the mechanoreceptors. These capabilities are discussed as in context to cellularly reprogrammed Schwann cells and tissue resident adult mesenchymal stem cells
Portrait of Mac Meissner
No full textMeissner, Mac--Portrait. A man in a dark suit and tie.https://mavmatrix.uta.edu/specialcollections_wdsmithphotography/8365/thumbnail.jp
Portrait of Mac Meissner
No full textMeissner, Mac--Portrait in Chaplain\u27s Uniform. A man wearing a religious uniform.https://mavmatrix.uta.edu/specialcollections_wdsmithphotography/8366/thumbnail.jp
Decision of the G-BA for the mandatory Introduction and Implementation of Acute Pain Management Concepts - Significance and Perspectives of the Anesthesiology Field
No full textDecision of the G-BA for the mandatory Introduction and Implementation of Acute Pain Management Concepts - Significance and Perspectives of the Anesthesiology Field
No full textValue-At-Risk Optimal Policies for Revenue Management Problems
No full textConsider a single-leg dynamic revenue management problem with fare classes controlled by capacity in a risk-averse setting. The revenue management strategy aims at limiting the down-side risk, and in particular, value-at-risk. A value-at-risk optimised policy offers an advantage when considering applications which do not allow for a large number of reiterations. They allow for specifying a confidence level regarding undesired scenarios. We state the underlying problem as a Markov decision process and provide a computational method for computing policies, which optimise the value-at-risk for a given confidence level. This is achieved by computing dynamic programming solutions for a set of target revenue values and combining the solutions in order to attain the requested multi-stage risk-averse policy. Numerical examples and comparison with other risk-sensitive approaches are discussed
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