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Search Results: 1 - 10 of 297487 matches for " J. Felde "
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Study of wavelength-shifting chemicals for use in large-scale water Cherenkov detectors
M. Sweany,A. Bernstein,S. Dazeley,J. Dunmore,J. Felde,R. Svoboda,M. Tripathi
Physics , 2011, DOI: 10.1016/j.nima.2011.10.064
Abstract: Cherenkov detectors employ various methods to maximize light collection at the photomultiplier tubes (PMTs). These generally involve the use of highly reflective materials lining the interior of the detector, reflective materials around the PMTs, or wavelength-shifting sheets around the PMTs. Recently, the use of water-soluble wavelength-shifters has been explored to increase the measurable light yield of Cherenkov radiation in water. These wave-shifting chemicals are capable of absorbing light in the ultravoilet and re-emitting the light in a range detectable by PMTs. Using a 250 L water Cherenkov detector, we have characterized the increase in light yield from three compounds in water: 4-Methylumbelliferone, Carbostyril-124, and Amino-G Salt. We report the gain in PMT response at a concentration of 1 ppm as: 1.88 $\pm$ 0.02 for 4-Methylumbelliferone, stable to within 0.5% over 50 days, 1.37 $\pm$ 0.03 for Carbostyril-124, and 1.20 $\pm$ 0.02 for Amino-G Salt. The response of 4-Methylumbelliferone was modeled, resulting in a simulated gain within 9% of the experimental gain at 1 ppm concentration. Finally, we report an increase in neutron detection performance of a large-scale (3.5 kL) gadolinium-doped water Cherenkov detector at a 4-Methylumbelliferone concentration of 1 ppm.
Thought Experiment to resolve the Black Hole Information Paradox
Kay zum Felde
Physics , 2014,
Abstract: We propose a combination of two mechanisms that can resolve the black hole information paradox. The first process is that the black hole shrinks by a first order transition, since we assume the entropy is discontinuous. The black hole disappears. The second type of processes conserves unitarity. We assume that within the black hole micro-reversible quantum mechanical processes take place. These are ordinary particle processes, e.g. the decay of an electron and a positron into two photons.
Novel Zagreb Indices-Based Inequalities with Particular Regard to Semiregular and Generalized Semiregular Graphs
Tamás Réti,Imre Felde
Mathematics , 2015,
Abstract: Topological relations between three degree-based invariants of a connected graph G are investigated. We present novel inequalities including M1(G), M2(G) and F(G), and show that in all cases equality holds if G is a regular or a semiregular graph. Additionally, the notion of so called weakly semiregular graphs is introduced, they are considered as a possible generalization of traditional bidegreed semiregular graphs. Based on the use of Zagreb indices based graph irregularity indices, for purposes of fullerene stability prediction, comparative tests have been performed on a finite set of dual graphs of C40 fullerene isomers. By using the findings obtained, the traditional concept of graph irregularity characterization has been critically reevaluated.
Characterization of the Hamamatsu R11780 12 inch Photomultiplier Tube
J. Brack,B. Delgado,J. Dhooghe,J. Felde,B. Gookin,S. Grullon,J. R. Klein,R. Knapik,A. LaTorre,S. Seibert,K. Shapiro,R. Svoboda,L. Ware,R. Van Berg
Physics , 2012, DOI: 10.1016/j.nima.2013.02.022
Abstract: Future large water Cherenkov and scintillator detectors have been proposed for measurements of long baseline neutrino oscillations, proton decay, supernova and solar neutrinos. To ensure cost-effectiveness and optimize scientific reach, one of the critical requirements for such detectors are large-area, high performance photomultiplier tubes (PMTs). One candidate for such a device is the Hamamatsu R11780, a 12" PMT that is available in both standard and high quantum efficiency versions. Measurements of the single photoelectron response characteristics, relative efficiencies of the standard and high quantum efficiency versions, a preliminary measurement of the absolute quantum efficiency of the standard quantum efficiency version, and a two-dimensional scan of the relative efficiency across the photocathode surface are presented in this paper. All single photoelectron investigations were made using a Cherenkov light source at room temperature at a gain of 1*10^7. These results show that the R11780 PMT is a excellent candidate for such large optical detectors, including the peak-to-valley ratios greater than 2, transit time spreads around 1.3 ns, and late-pulsing probabilities less than 5%.
Management of fibromyalgia syndrome – an interdisciplinary evidence-based guideline
H?user, Winfried,Arnold, Bernhard,Eich, Wolfgang,Felde, Eva
GMS German Medical Science , 2008,
Abstract: The prevalence of fibromyalgia syndrome (FMS) of 1–2% in the general population associated with high disease-related costs and the conflicting data on treatment effectiveness had led to the development of evidence-based guidelines designed to provide patients and physicians guidance in selecting among the alternatives. Until now no evidence-based interdisciplinary (including patients) guideline for the management of FMS was available in Europe. Therefore a guideline for the management of fibromyalgia syndrome (FMS) was developed by 13 German medical and psychological associations and two patient self-help organisations. The task was coordinated by two German scientific umbrella organisations, the Association of the Scientific Medical Societies in Germany AWMF and the German Interdisciplinary Association of Pain Therapy DIVS. A systematic search of the literature including all controlled studies, systematic reviews and meta-analyses of pharmacological and non-pharmacological treatments of FMS was performed in the Cochrane Library (1993–12/2006), Medline (1980–12/2006), PsychInfo (1966–12/2006) and Scopus (1980–12/ 2006). Levels of evidence were assigned according to the classification system of the Oxford-Centre for Evidence Based Medicine. Grading of the strengths of recommendations was done according to the German program for disease management guidelines. Standardized procedures were used to reach a consensus on recommendations. The guideline was reviewed and finally approved by the boards of the societies involved and published online by the AWMF on april 25, 2008: http://www.uni-duesseldorf.de/AWMF/ll/041-004.htm. A short version of the guideline for patients is available as well: http://www.uni-duesseldorf.de/AWMF/ll/041-004p.htm. The following procedures in the management of FMS were strongly recommended: information on diagnosis and therapeutic options and patient-centered communication, aerobic exercise, cognitive and operant behavioural therapy, multicomponent treatment and amitriptyline. Based on expert opinion, a stepwise FMS-management was proposed. Step 1 comprises confirming the diagnosis and patient education and treatment of physical or mental comorbidities or aerobic exercise or cognitive behavioural therapy or amitriptyline. Step 2 includes multicomponent treatment. Step 3 comprises no further treatment or self-management (aerobic exercise, stress management) and/or booster multicomponent therapy and/or pharmacological therapy (duloxetine or fluoxetine or paroxetine or pregabalin or tramadol/aminoacetophen) and/or psychotherapy (hypnot
Application of JM -Test in 3D simulation of quenching
B. Smoljan,N. Toma?i?,D. Iljki?,I. Felde
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: Simulation of hardness distribution in quenched steel specimen has been investigated using 3D numerical formulation. Structural mesh has been used in numerical simulation. Numerical calculations of hardness distribution in specimen made of high hardenability steel have been performed in order to define appropriate steel for manufacturing of machine part. Possibility of application of numerical model based on experimental results in steel quenching has been investigated.Design/methodology/approach: Numerical simulation of the steel quenching is consisted of computation of cooling curve during the quenching and prediction of hardness at specimen points after the quenching. Hardness at specimen points is estimated by the conversion of cooling time results to hardness. Conversion is provided by the relation between cooling time and distance from the quenched end of Jominy-specimen. In this way the numerical simulation has been combined with experimental Jominy-test.Findings: Structure transformation and hardness distribution can be successfully estimated based on time, relevant to structure transformation. Relevant time for quenching results for most structural steels is cooling time from 800 to 500 C (t8/5).Research limitations/implications: Since high hardenability of investigated steel there are limits in application of original Jominy-specimen in simulation of quenching of steels. The modified Jominy-test enables cooling time, t8/5 higher than Jominy-test.Practical implications: The simulation of quenching based on modified Jominy-test can be applied for steels with higher hardenability. This method of simulation is especially suitable for tools and dies steels. 3D numerical simulation of quenching is more confident in practical implementation and provides more information than 2D formulation.Originality/value: Using the results of simple experimental test, i.e., modified Jominy-test in numerical modeling of steel quenching it is possible to achieve better results of hardness simulation.
Comparative analysis of techniques for diagnos-tics of phase singularities
Felde Ch.V.,Polyanski P.V.,Bogatyryova H.V.
Ukrainian Journal of Physical Optics , 2008,
Abstract: A comparative analysis of several techniques used for diagnostics of phase singularities in the optical vortex beams and fields is per-formed. Both the advantages and shortcomings of implementation and application of those techniques are discussed
Reactor electron antineutrino disappearance in the Double Chooz experiment
Y. Abe,C. Aberle,J. C. dos Anjos,J. C. Barriere,M. Bergevin,A. Bernstein,T. J. C. Bezerra,L. Bezrukhov,E. Blucher,N. S. Bowden,C. Buck,J. Busenitz,A. Cabrera,E. Caden,L. Camilleri,R. Carr,M. Cerrada,P. -J. Chang,P. Chimenti,T. Classen,A. P. Collin,E. Conover,J. M. Conrad,J. I. Crespo-Anadón,K. Crum,A. Cucoanes,M. V. D'Agostino,E. Damon,J. V. Dawson,S. Dazeley,D. Dietrich,Z. Djurcic,M. Dracos,V. Durand,J. Ebert,Y. Efremenko,M. Elnimr,A. Etenko,M. Fallot,M. Fechner,F. von Feilitzsch,J. Felde,D. Franco,A. J. Franke,M. Franke,H. Furuta,R. Gama,I. Gil-Botella,L. Giot,M. Goger-Neff,L. F. G. Gonzalez,M. C. Goodman,J. TM. Goon,D. Greiner,N. Haag,C. Hagner,T. Hara,F. X. Hartmann,J. Haser,A. Hatzikoutelis,T. Hayakawa,M. Hofmann,G. A. Horton-Smith,A. Hourlier,M. Ishitsuka,J. Jochum,C. Jollet,C. L. Jones,F. Kaether,L. N. Kalousis,Y. Kamyshkov,D. M. Kaplan,T. Kawasaki,G. Keefer,E. Kemp,H. de Kerret,Y. Kibe,T. Konno,D. Kryn,M. Kuze,T. Lachenmaier,C. E. Lane,C. Langbrandtner,T. Lasserre,A. Letourneau,D. Lhuillier,H. P. Lima Jr,M. Lindner,J. M. López-Castan?,J. M. LoSecco,B. K. Lubsandorzhiev,S. Lucht,D. McKee,J. Maeda,C. N. Maesano,C. Mariani,J. Maricic,J. Martino,T. Matsubara,G. Mention,A. Meregaglia,T. Miletic,R. Milincic,H. Miyata,Th. A. Mueller,Y. Nagasaka,K. Nakajima,P. Novella,M. Obolensky,L. Oberauer,A. Onillon,A. Osborn,I. Ostrovskiy,C. Palomares,I. M. Pepe,S. Perasso,P. Perrin,P. Pfahler,A. Porta,W. Potzel,J. Reichenbacher,B. Reinhold,A. Remoto,M. Rohling,R. Roncin,S. Roth
Statistics , 2012, DOI: 10.1103/PhysRevD.86.052008
Abstract: The Double Chooz experiment has observed 8,249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power x detector mass x livetime) exposure using a 10.3 cubic meter fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of theta13 = 0 is 8,937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin^2 2{\theta}13 = 0.109 \pm 0.030(stat) \pm 0.025(syst). The data exclude the no-oscillation hypothesis at 99.8% CL (2.9{\sigma}).
First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment
Double Chooz Collaboration,Y. Abe,C. Aberle,J. C. dos Anjos,M. Bergevin,A. Bernstein,T. J. C. Bezerra,L. Bezrukhov,E. Blucher,N. S. Bowden,C. Buck,J. Busenitz,A. Cabrera,E. Caden,L. Camilleri,R. Carr,M. Cerrada,P. -J. Chang,P. Chimenti,T. Classen,A. P. Collin,E. Conover,J. M. Conrad,J. I. Crespo-Anadón,K. Crum,A. Cucoanes,M. V. D'Agostino,E. Damon,J. V. Dawson,S. Dazeley,D. Dietrich,Z. Djurcic,M. Dracos,V. Durand,J. Ebert,Y. Efremenko,M. Elnimr,A. Erickson,M. Fallot,M. Fechner,F. von Feilitzsch,J. Felde,V. Fischer,D. Franco,A. J. Franke,M. Franke,H. Furuta,R. Gama,I. Gil-Botella,L. Giot,M. G?ger-Neff,L. F. G. Gonzalez,M. C. Goodman,J. TM. Goon,D. Greiner,N. Haag,S. Habib,C. Hagner,T. Hara,F. X. Hartmann,J. Haser,A. Hatzikoutelis,T. Hayakawa,M. Hofmann,G. A. Horton-Smith,M. Ishitsuka,J. Jochum,C. Jollet,C. L. Jones,F. Kaether,L. N. Kalousis,Y. Kamyshkov,D. M. Kaplan,T. Katori,T. Kawasaki,G. Keefer,E. Kemp,H. de Kerret,T. Konno,D. Kryn,M. Kuze,T. Lachenmaier,C. E. Lane,T. Lasserre,A. Letourneau,D. Lhuillier,H. P. Lima Jr,M. Lindner,J. M. López-Casta?o,J. M. LoSecco,B. K. Lubsandorzhiev,S. Lucht,D. McKee,J. Maeda,C. N. Maesano,C. Mariani,J. Maricic,J. Martino,T. Matsubara,G. Mention,A. Meregaglia,M. Meyer,T. Miletic,R. Milincic,H. Miyata,Th. A. Mueller,Y. Nagasaka,K. Nakajima,P. Novella,M. Obolensky,L. Oberauer,A. Onillon,A. Osborn,I. Ostrovskiy,C. Palomares,I. M. Pepe,S. Perasso,P. Perrin,P. Pfahler,A. Porta,W. Potzel,G. Pronost,J. Reichenbacher,B. Reinhold,A. Remoto
Physics , 2012, DOI: 10.1103/PhysRevD.86.112009
Abstract: We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor.
Improved measurements of the neutrino mixing angle $θ_{13}$ with the Double Chooz detector
Y. Abe,J. C. dos Anjos,J. C. Barriere,E. Baussan,I. Bekman,M. Bergevin,T. J. C. Bezerra,L. Bezrukov,E. Blucher,C. Buck,J. Busenitz,A. Cabrera,E. Caden,L. Camilleri,R. Carr,M. Cerrada,P. -J. Chang,E. Chauveau,P. Chimenti,A. P. Collin,E. Conover,J. M. Conrad,J. I. Crespo-Anadón,K. Crum,A. S. Cucoanes,E. Damon,J. V. Dawson,J. Dhooghe,D. Dietrich,Z. Djurcic,M. Dracos,M. Elnimr,A. Etenko,M. Fallot,F. von Feilitzsch,J. Felde,S. M. Fernandes,V. Fischer,D. Franco,M. Franke,H. Furuta,I. Gil-Botella,L. Giot,M. G?ger-Neff,L. F. G. Gonzalez,L. Goodenough,M. C. Goodman,C. Grant,N. Haag,T. Hara,J. Haser,M. Hofmann,G. A. Horton-Smith,A. Hourlier,M. Ishitsuka,J. Jochum,C. Jollet,F. Kaether,L. N. Kalousis,Y. Kamyshkov,D. M. Kaplan,T. Kawasaki,E. Kemp,H. de Kerret,D. Kryn,M. Kuze,T. Lachenmaier,C. E. Lane,T. Lasserre,A. Letourneau,D. Lhuillier,H. P. Lima Jr,M. Lindner,J. M. López-Casta?o,J. M. LoSecco,B. Lubsandorzhiev,S. Lucht,J. Maeda,C. Mariani,J. Maricic,J. Martino,T. Matsubara,G. Mention,A. Meregaglia,T. Miletic,R. Milincic,A. Minotti,Y. Nagasaka,Y. Nikitenko,P. Novella,L. Oberauer,M. Obolensky,A. Onillon,A. Osborn,C. Palomares,I. M. Pepe,S. Perasso,P. Pfahler,A. Porta,G. Pronost,J. Reichenbacher,B. Reinhold,M. R?hling,R. Roncin,S. Roth,B. Rybolt,Y. Sakamoto,R. Santorelli,A. C. Schilithz,S. Sch?nert,S. Schoppmann,M. H. Shaevitz,R. Sharankova,S. Shimojima,D. Shrestha,V. Sibille,V. Sinev,M. Skorokhvatov,E. Smith,J. Spitz,A. Stahl,I. Stancu,L. F. F. Stokes,M. Strait,A. Stüken,F. Suekane
Physics , 2014, DOI: 10.1007/JHEP10(2014)086
Abstract: The Double Chooz experiment presents improved measurements of the neutrino mixing angle $\theta_{13}$ using the data collected in 467.90 live days from a detector positioned at an average distance of 1050 m from two reactor cores at the Chooz nuclear power plant. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties with respect to previous publications, whereas the efficiency of the $\bar\nu_{e}$ signal has increased. The value of $\theta_{13}$ is measured to be $\sin^{2}2\theta_{13} = 0.090 ^{+0.032}_{-0.029}$ from a fit to the observed energy spectrum. Deviations from the reactor $\bar\nu_{e}$ prediction observed above a prompt signal energy of 4 MeV and possible explanations are also reported. A consistent value of $\theta_{13}$ is obtained from a fit to the observed rate as a function of the reactor power independently of the spectrum shape and background estimation, demonstrating the robustness of the $\theta_{13}$ measurement despite the observed distortion.
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