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Search Results: 1 - 10 of 34718 matches for " Peter Wolf "
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Meson vacuum phenomenology in a three-flavor linear sigma model with (axial-)vector mesons: investigation of the U(1)_A anomaly term
Kovacs, Peter;Wolf, Gyorgy
High Energy Physics - Phenomenology , 2013,
Abstract: Zero temperature properties of an (axial-) vector meson extended linear sigma model are discussed, concerning on the possible different realizations of the axial anomaly term. The different anomaly terms are compared with each other on the basis of a chi^2 minimalization process. It is found that there is no essential difference among the different realizations. This means that any of them can be equally used from phenomenological point of view.
The Proof of the Pudding is in the Eating – doch woraus besteht eigentlich der Pudding? Ein funktionierendes "Un-Konferenz"-Konzept auf der Suche nach seinen theoretischen The Proof of the Pudding is in the Eating—but What was the Pudding in the First Place? A Proven Unconferencing Approach in Search of Its Theoretical Foundations La prueba del postre está al comerlo, pero fue el postre el primer plato? Un enfoque demostrado de no-conferencia en busca
Patricia Wolf,Peter Troxler
Forum : Qualitative Social Research , 2008,
Abstract: Dieser Artikel beschreibt, wie "Un-Konferenzen" zur Vision sozialer Ver nderungen durch performative Sozialforschung beitragen. Wir gehen dabei davon aus, dass die Teilnahme an Konferenzen, das Zusammenkommen von Menschen und das Zusammentragen von Gedanken integrale Bestandteile von Forschung sind. Das Potenzial, Lernprozesse m glich zu machen und damit sozialen Wandel zu unterstützen, haben jedoch allein jene Konferenzen, die ohne die Rituale von Macht, Status und Hierarchie auskommen und darum "Un-Konferenzen" genannt werden. Wir entwickeln aus der Reflektion sozialwissenschaftlicher Theorien ein theoretisches Modell für Un-Konferenzen. Dieses Modell zeigt auf, wie Un-Konferenzen individuelle und soziale Lernprozesse unterstützen, indem sie strukturelle Koppellungen zwischen unterschiedlichen gesellschaftlichen Subsystemen herstellen und mit geeigneten Methoden systematisch Wissenstransformation erm glichen. Anhand des funktionierendem Un-Konferenz-Konzeptes "unBla" (i.S. von "das BlaBla entfernen") erkl ren wir, wie die theoretischen Prinzipien von Un-Konferenzen in der Praxis umgesetzt werden und was Ergebnisse einer Un-Konferenz sein k nnen. 1) W rtlich etwa: Beweisen kann man den Pudding nur, indem man ihn isst. Bedeutung hnlich zu "Probieren geht über Studieren". URN: urn:nbn:de:0114-fqs0802614 This article outlines how unconferencing contributes to the vision of a performative social science that aims at stimulating social change. The authors argue that conference participation is an integral part of research and has the potential to support social change by enabling learning processes. They then develop an unconferencing model from the theoretical reflection of different theories from social science which reveals that unconferences support individual and social learning processes through enabling knowledge transformation as well as through creating structural links between societal sub systems. Using the example of an elaborated unconferencing concept called UnBla (i.e., to remove the blah-blah) which has proven to work well, the authors explain how the theoretical principles of unconferencing are applied in reality and what the outcomes of unconferences can be. URN: urn:nbn:de:0114-fqs0802614 Este artículo aborda como la no-conferencia contribuye a la visión de la ciencia social preformativa que persigue estimular el cambio social. Los autores argumentan que la participación en conferencia es una parte integral de la investigación y tiene el potencial de apoyar el cambio social al permitir procesos de aprendizaje. Desarrollan en consecuencia
An optical clock with neutral atoms confined in a shallow trap
Pierre Lemonde,Peter Wolf
Physics , 2005,
Abstract: We study the trap depth requirement for the realization of an optical clock using atoms confined in a lattice. We show that site-to-site tunnelling leads to a residual sensitivity to the atom dynamics hence requiring large depths (50 to $100 E\_r$ for Sr) to avoid any frequency shift or line broadening of the atomic transition at the $10^{-17}-10^{-18}$ level. Such large depths and the corresponding laser power may, however, lead to difficulties (e.g. higher order light shifts, two-photon ionization, technical difficulties) and therefore one would like to operate the clock in much shallower traps. To circumvent this problem we propose the use of an accelerated lattice. Acceleration lifts the degeneracy between adjacents potential wells which strongly inhibits tunnelling. We show that using the Earth's gravity, much shallower traps (down to $5 E\_r$ for Sr) can be used for the same accuracy goal.
Analysis of Sun/Moon Gravitational Redshift tests with the STE-QUEST Space Mission
Peter Wolf,Luc Blanchet
Physics , 2015,
Abstract: The STE-QUEST space mission will perform tests of the gravitational redshift in the field of the Sun and the Moon to high precision by frequency comparisons of clocks attached to the ground and separated by intercontinental distances. In the absence of Einstein equivalence principle (EP) violation, the redshift is zero up to small tidal corrections as the Earth is freely falling in the field of the Sun and Moon. Such tests are thus null tests, allowing to bound possible violations of the EP. Here we analyze the Sun/Moon redshift tests using a generic EP violating theoretical framework, with clocks minimally modelled as two-level atoms. We present a complete derivation of the redshift (including both GR and non-GR terms) in a realistic experiment such as the one envisaged for STE-QUEST. We point out and correct an error in previous formalisms linked to the atom's recoil not being properly taken into account.
Distance Geometry in Quasihypermetric Spaces. I
Peter Nickolas,Reinhard Wolf
Mathematics , 2008,
Abstract: Let $(X, d)$ be a compact metric space and let $\mathcal{M}(X)$ denote the space of all finite signed Borel measures on $X$. Define $I \colon \mathcal{M}(X) \to \R$ by \[I(\mu) = \int_X \int_X d(x,y) d\mu(x) d\mu(y),\] and set $M(X) = \sup I(\mu)$, where $\mu$ ranges over the collection of signed measures in $\mathcal{M}(X)$ of total mass 1. The metric space $(X, d)$ is quasihypermetric if for all $n \in \N$, all $\alpha_1, ..., \alpha_n \in \R$ satisfying $\sum_{i=1}^n \alpha_i = 0$ and all $x_1, ..., x_n \in X$, one has $\sum_{i,j=1}^n \alpha_i \alpha_j d(x_i, x_j) \leq 0$. Without the quasihypermetric property $M(X)$ is infinite, while with the property a natural semi-inner product structure becomes available on $\mathcal{M}_0(X)$, the subspace of $\mathcal{M}(X)$ of all measures of total mass 0. This paper explores: operators and functionals which provide natural links between the metric structure of $(X, d)$, the semi-inner product space structure of $\mathcal{M}_0(X)$ and the Banach space $C(X)$ of continuous real-valued functions on $X$; conditions equivalent to the quasihypermetric property; the topological properties of $\mathcal{M}_0(X)$ with the topology induced by the semi-inner product, and especially the relation of this topology to the weak-$*$ topology and the measure-norm topology on $\mathcal{M}_0(X)$; and the functional-analytic properties of $\mathcal{M}_0(X)$ as a semi-inner product space, including the question of its completeness. A later paper [Peter Nickolas and Reinhard Wolf, Distance Geometry in Quasihypermetric Spaces. II] will apply the work of this paper to a detailed analysis of the constant $M(X)$.
Distance Geometry in Quasihypermetric Spaces. III
Peter Nickolas,Reinhard Wolf
Mathematics , 2008,
Abstract: Let $(X, d)$ be a compact metric space and let $\mathcal{M}(X)$ denote the space of all finite signed Borel measures on $X$. Define $I \colon \mathcal{M}(X) \to \R$ by \[ I(\mu) = \int_X \int_X d(x,y) d\mu(x) d\mu(y), \] and set $M(X) = \sup I(\mu)$, where $\mu$ ranges over the collection of signed measures in $\mathcal{M}(X)$ of total mass 1. This paper, with two earlier papers [Peter Nickolas and Reinhard Wolf, Distance geometry in quasihypermetric spaces. I and II], investigates the geometric constant $M(X)$ and its relationship to the metric properties of $X$ and the functional-analytic properties of a certain subspace of $\mathcal{M}(X)$ when equipped with a natural semi-inner product. Specifically, this paper explores links between the properties of $M(X)$ and metric embeddings of $X$, and the properties of $M(X)$ when $X$ is a finite metric space.
Distance Geometry in Quasihypermetric Spaces. II
Peter Nickolas,Reinhard Wolf
Mathematics , 2008,
Abstract: Let $(X, d)$ be a compact metric space and let $\mathcal{M}(X)$ denote the space of all finite signed Borel measures on $X$. Define $I \colon \mathcal{M}(X) \to \R$ by \[ I(\mu) = \int_X \int_X d(x,y) d\mu(x) d\mu(y), \] and set $M(X) = \sup I(\mu)$, where $\mu$ ranges over the collection of signed measures in $\mathcal{M}(X)$ of total mass 1. This paper, with an earlier and a subsequent paper [Peter Nickolas and Reinhard Wolf, Distance geometry in quasihypermetric spaces. I and III], investigates the geometric constant $M(X)$ and its relationship to the metric properties of $X$ and the functional-analytic properties of a certain subspace of $\mathcal{M}(X)$ when equipped with a natural semi-inner product. Using the work of the earlier paper, this paper explores measures which attain the supremum defining $M(X)$, sequences of measures which approximate the supremum when the supremum is not attained and conditions implying or equivalent to the finiteness of $M(X)$.
Finite Quasihypermetric Spaces
Peter Nickolas,Reinhard Wolf
Mathematics , 2009,
Abstract: Let $(X, d)$ be a compact metric space and let $\mathcal{M}(X)$ denote the space of all finite signed Borel measures on $X$. Define $I \colon \mathcal{M}(X) \to \R$ by $I(mu) = \int_X \int_X d(x,y) d\mu(x) d\mu(y)$, and set $M(X) = \sup I(mu)$, where $\mu$ ranges over the collection of measures in $\mathcal{M}(X)$ of total mass 1. The space $(X, d)$ is \emph{quasihypermetric} if $I(\mu) \leq 0$ for all measures $\mu$ in $\mathcal{M}(X)$ of total mass 0 and is \emph{strictly quasihypermetric} if in addition the equality $I(\mu) = 0$ holds amongst measures $\mu$ of mass 0 only for the zero measure. This paper explores the constant $M(X)$ and other geometric aspects of $X$ in the case when the space $X$ is finite, focusing first on the significance of the maximal strictly quasihypermetric subspaces of a given finite quasihypermetric space and second on the class of finite metric spaces which are $L^1$-embeddable. While most of the results are for finite spaces, several apply also in the general compact case. The analysis builds upon earlier more general work of the authors [Peter Nickolas and Reinhard Wolf, \emph{Distance geometry in quasihypermetric spaces. I}, \emph{II} and \emph{III}].
Management of Unsuspected Gallbladder Cancer in the Era of Minimally Invasive Surgery  [PDF]
Patrick Wolf, Puneet Bhargava, Carlos Pellegrini, Peter C. Wu
Journal of Cancer Therapy (JCT) , 2010, DOI: 10.4236/jct.2010.13024
Abstract: Gallbladder cancer is the most common malignant tumor of the biliary tract and often diagnosed incidentally during laparoscopic cholecystectomy for gallbladder disease. This underscores the importance of considering the diagnosis of gallbladder cancer when confronted with atypical findings and understanding cancer management guidelines that may impact patient outcome. Potentially curable early stage gallbladder lesions are often missed during preoperative workup and discovered incidentally during difficult cholecystectomy or afterwards on pathologic diagnosis. We will review current strategies to diagnose early stage disease and discuss clinical management issues to optimize the outcome of patients with gallbladder cancer.
Effectiveness and tolerability of a fixed-dose combination of olmesartan and amlodipine in clinical practice
Peter Bramlage, Wolf-Peter Wolf, Thomas Stuhr, et al
Vascular Health and Risk Management , 2010, DOI: http://dx.doi.org/10.2147/VHRM.S13441
Abstract: tiveness and tolerability of a fixed-dose combination of olmesartan and amlodipine in clinical practice Original Research (3930) Total Article Views Authors: Peter Bramlage, Wolf-Peter Wolf, Thomas Stuhr, et al Published Date August 2010 Volume 2010:6 Pages 803 - 811 DOI: http://dx.doi.org/10.2147/VHRM.S13441 Peter Bramlage1, Wolf-Peter Wolf2, Thomas Stuhr2, Eva-Maria Fronk3, Wolfhard Erdlenbruch2, Reinhard Ketelhut4, Roland E Schmieder5 1Institute for Cardiovascular Pharmacology and Epidemiology, Mahlow; 2Daiichi Sankyo Deutschland GmbH, Munich, Germany; 3Daiichi Sankyo Europe GmbH, Munich, Germany; 4Department of Sports Medicine, Universit tsklinikum Berlin; 5Department of Nephrology and Hypertension, University Hospital of Erlangen, Germany Objectives: To assess the efficacy and tolerability of a fixed-dose combination of olmesartan and amlodipine in an unselected population of patients in primary care and to compare the results with recent randomized controlled trial evidence. Methods: A multicenter, noninterventional, noncontrolled observational study with 8241 hypertensive patients seen by 2187 physicians in daily practice. Blood pressure (BP) reduction, comorbid disease, pharmacotherapy, and tolerability were documented over a 12–18-week observational period. Results: Patients had a mean age of 62.8 ± 11.8 years (48.1% female), and 74.8% had at least one comorbid risk factor or condition. In total, 51.3% received olmesartan-amlodipine 20/5 mg, 30.6% received 40/5 mg, and 17.9% received 40/10 mg at baseline, mostly because of lack of efficacy on prior antihypertensive therapy (73.8%). BP at baseline was 161.8 ± 16.6/93.6 ± 10.2 mmHg (39.8% had Grade 2 hypertension), and the observed BP reduction was -29.0 ± 17.1/-13.5 ± 10.9 mmHg (P < 0.0001), with a significant correlation between BP at baseline and BP reduction (Spearman’s Rho -0.811 for systolic BP and -0.759 for diastolic BP). BP reduction appeared to be dependent on dose and prior antihypertensive therapy, but not on age, gender, body mass index, duration of hypertension, or the presence of diabetes. At the final visit, 69.4% (4.3% at baseline) were controlled (<140/90 mmHg). Adverse drug reactions were observed in 2.76% of the study population; 94.25% of these adverse drug reactions were judged as nonserious events, and 31.5% of all adverse drug reactions reported were peripheral edema. Conclusion: The fixed-dose olmesartan-amlodipine combination was effective and well tolerated in an unselected population of patients in primary care practice. These results confirm prior randomized controlled trial evidence.
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