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Search Results: 1 - 10 of 167678 matches for " E. Caden "
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Quantum Mechanical Reflection Resonances
Erica Caden,Robert Gilmore
Physics , 2006,
Abstract: Resonances in the reflection probability amplitude r(E) can occur in energy ranges in which the reflection probability R(E)=|r(E)|^2 is 1. They occur as the phase phi(E) defined by r(E) = t*(E)/t(E) = 1e^{i 2phi(E)} undergoes a rapid change of pi radians. During this transition the phase angle exhibits a Lorentzian profile in that d(phi(E))/dE ~= 1/[(E-E_0)^2+(hbar*gamma/2)^2]. The energy E_0 identifies the location of a quasi-bound state, gamma measures the lifetime of this state, and t(E) is a matrix element of the transfer operator. Methods for computing and measuring these resonances are proposed.
High Order Harmonics in Light Curves of Kepler Planets
Caden Armstrong,Hanno Rein
Physics , 2015, DOI: 10.1093/mnrasl/slv112
Abstract: The Kepler mission was launched in 2009 and has discovered thousands of planet candidates. In a recent paper, Esteves et al. (2013) found a periodic signal in the light curves of KOI-13 and HAT-P-7, with a frequency triple the orbital frequency of a transiting planet. We found similar harmonics in many systems with a high occurrence rate. At this time, the origins of the signal are not entirely certain. We look carefully at the possibility of errors being introduced through our data processing routines but conclude that the signal is real. The harmonics on multiples of the orbital frequency are a result of non-sinusoidal periodic signals. We speculate on their origin and generally caution that these harmonics could lead to wrong estimates of planet albedos, beaming mass estimates, and ellipsoidal variations.
Studying Neutrino Directionality with Double Chooz
Erica Caden,for the Double Chooz collaboration
Physics , 2012,
Abstract: The first results from Double Chooz with 100 days of data measured $\sin^2(2\theta_{13}) = 0.086 \pm 0.051$. Backgrounds contribute significantly to the systematic uncertainty budget. Using the incoming neutrino directionality we will attempt to further separate the inverse beta decay signal from backgrounds. The CHOOZ experiment completed a similar analysis and found that the neutrino source can be located to within a cone of half-aperture of 18 degrees at the 68% C.L. We study the possible improvement of this result by Double Chooz.
The water extract of Coleus barbatus Benth decreases gastric secretion in rats
Fischman, Lygia A.;Skorupa, L. A.;Souccar, Caden;Lapa, A. J.;
Memórias do Instituto Oswaldo Cruz , 1991, DOI: 10.1590/S0074-02761991000600032
Abstract: coleus barbatus (labiatae) benth is popularly used in brazil "for the healing of liver and stomach diseases". the water extract (we 1 to 10 g/kg, p.o.) of stem and leaves given to rats and mice did not induce signs of intoxication. preveious treatment of mice with we (1 g/kg, p.o.) shortened the sleeping time induced by pentobarbital (50 mg/kg, i.p.) by 37 por cento, althoyugh the extract alone did not increase the spontaneous activity nor did it induce hyperexcitability. in mice we (2 g/kg, p.o.) increased the intestinal transit of charcoal by 30 por cento, while reduced gastric secretions ion rats treated with we (2g/kg intraduodenal) 3,9 ± 1.0 to 0.5 ± 0.2 ml/4h, respectively). the treatment also reduced the total acid secretion from 34.4 ± 11.0 to 2.7 ± 0.5 meq/l and raisedgastric ph from 2.2 ± 0.3 to 6.5 ± 0.8. treatment with we (2g/kg, p.o.) protected against gastric ulcers induced by stress (5.3 ± 1.6 and 1.5 ± 0.5 ulcers/cm2), but did nor protect against indonethacin induced ulcers. the results show that the water extract of c barbatus benth produces mild stimulation of thecentral nervous system and increases intestinal movements. the extract also reduces gastric secretion indicating an antidyspeptic activity, and protects against gastric ulcers induced by stress.
Inhibition of gastric secretion by a water extract from Baccharis triptera, Mart
Gamberini, Maria T.;Skorupa, L. A.;Souccar, Caden;Lapa, Antonio J.;
Memórias do Instituto Oswaldo Cruz , 1991, DOI: 10.1590/S0074-02761991000600031
Abstract: baccharus triptera mart, is a widespread compositae used in brazilian folk medicine to treat gastrointestinal disturbances, rheumatic disease, mild fever, diabetes and as an anti-helminthic. water extract of small branches of the plant (we) administered to mice and rats (0.1 to 2 g/kg, p.o) did not alter spontaneous motor activity, sleeping time induced by barbiturates or the tailflick response in mice. the extract decreased by 40 por cento the number of writhings induced by 0.8 por cento scetic acid, i.p., but did not influence paw edema induced by carrageenan or dextran in rats we (2g/kg, p.o.) decreased the intestinal transit of charcoal in mice by 20//. gastric secretion in pylorus ligated rats was reduced after treatment with we (1 and 2 g/kg. i.p. or intraduodenal and the gastric ph was raised. the extract (1 g/kg, p.o.) prevented gastric ulcers induced in rats by immobilization at 4oc, but not those induced by indomethacin (10 mg/kg, s.c.). the results indicate that we may relieve gastrointestinal disorders by reducing acid secretion and gastrointestinal hiperactivity. neither analgesic nor anti-inflammatory activities were detectable.
Analgesic activity of a triterpene isolated from Scoparia dulcis L. (vassourinha)
Freire, Sonia M. F.;Torres, Luce M. B.;Roque, Nidia F.;Souccar, Caden;Lapa, Antonio J.;
Memórias do Instituto Oswaldo Cruz , 1991, DOI: 10.1590/S0074-02761991000600034
Abstract: analgesic and anti-inflammatory activities of water (we) and ethanolic (ee) extracts of scoparia dulcis l. were investigated in rats and mice, and compared to the effects induced by glutinol, a triterpene isolated by purification of ee. oral adminsitration (p.o.) of either we or ee (up to 2 g/kg) did not alter the normal spontaneous activity of mice and rats. the sleeping time induced by sodium pentobarbital (50 mg/kg, i.p.) was prolonged by 2 fold in mice pretreated with 0.5 g/kg ee, p.o. neither extract altered the tail flick response of mice in immersion test, but previous administration of ee (0.5 g/kg, p.o.) reduced writhings induced by 0.8% acetic acid (0.1 ml/10 g, i.p.) in mice by 47% ee (0.5 and 1 g/kg, p.o.) inhibited the paw edema induced by carrageenan in rats by respectively 46% and 58% after 2 h, being ineffective on the paw edema induced by dextran. no significant analgesic or anti-edema effects were detected in animals pretreated with we (1 g/kg, p.o.). administration of glutinol (30 mg/kg, p.o.) reduced writhing induced by acetic acid in mice by 40% and the carrageenan induced paw edema in rats by 73%. the results indicate that the analgesic activity of s dulcis l. may be explained by explained by an anti-inflammatory activity probably related to the triterpene glutinol.
Pharmacological screening of Ageratum conyzoides L. (mentrasto)
Yamamoto, Lucia A.;Soldera, Janete C.;Emim, José A. S.;Godinho, Rosely O.;Souccar, Caden;Lapa, Antonio J.;
Memórias do Instituto Oswaldo Cruz , 1991, DOI: 10.1590/S0074-02761991000600033
Abstract: the pharmacological activities of a water extract (we) of ageratum conyzoides l, a plant populary known for its analgesic and anti-inflamatory properties, were studied in vivo and in vitro preparations. oral administration (p.o.) of the water extract (we, 0.1 to 5 g/kg) to rats and mice induced quietness and reduced the spontaneous motility. the sleeping time induced by sodium pentobarbital (50 mg/kg, i.p.) in mice was not altered by previous treatment with we (2 g/kg, p.o.). the same treatment did not influence the paw edema induced by carrageenan or dextran, nor did it reduce the chronic paw edema induced by complete freund's adjuvant or formaldehyde in rats. the tail flick response in immersion test and writhings induced by 0.8%acetic acid in mice were not altered by we either. in isolated guinea-pig ilea we (0.4 to 4 mg/ml) did not alter the ec50 values of histamine or acetylcholine, but reduced the maximal response to the agonists by 20 to 50%. we (0.01 to 10 mg/ml) produced tonic contractions of the ileal smooth muscle proportional to the doses, reaching a maximum of 75% relatively to the maximum obtained with histamine. those contractions were blocked by diphenhydramine (10 nm) and reduced by 32% in presence of atropine (10 nm). the results indicated that oral treatment of rodents with a. conyzoides l neither reduced the inflammatory edema nor did it decrease the reaction to pain stimuli. in vitro the extract presented an unexpected histamine-like activity characteristic of a partial agonist. the results did not confirm the popular medicinal indications of the plant.
Antinociceptive and antiinflammatory activities of the aqueous extract and isolated Cuphea carthagenensis (Jacq.) J. F. Macbr.
Fernandes, Francis Rigolo;Santos, André Luis dos;Arruda, Ana Maria Soares de;Vasques-Pinto, Luciana de Miranda C.;Godinho, Rosely Oliveira;Torres, Luce Maria Brand?o;Lapa, Antonio José;Souccar, Caden;
Revista Brasileira de Farmacognosia , 2002, DOI: 10.1590/S0102-695X2002000300027
Abstract: the aqueous extract (ae) and isolated fraction (ppt-3) of cuphea carthagenensis (jacq.) j. f. macbr (sete-sangrias) were tested using models of nociception and inflammation in mice. oral administration (p.o.) of the ae (10 to 100 mg/kg) and fraction ppt-3 (0.1 to 10 mg/kg) reduced the acetic acid-induced writhing in mice by 40 to 50% and by 46 to 70% of control, respectively. at the same doses ae and ppt-3 did not affect the tail flick response. fraction ppt-3 also reduced the carrageenininduced paw edema, but at a dose 1000 times higher than that inducing antinociception. the results indicated the presence in the plant of antinociceptive constituents devoid of antiinflammatory activity, with actions apparently mediated by non-opioid mechanisms.
Precision Muon Reconstruction in Double Chooz
Double Chooz collaboration,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. Cucoanes,E. Damon,J. V. Dawson,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 no,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,M. Obolensky,L. Oberauer,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,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: 10.1016/j.nima.2014.07.058
Abstract: We describe a muon track reconstruction algorithm for the reactor anti-neutrino experiment Double Chooz. The Double Chooz detector consists of two optically isolated volumes of liquid scintillator viewed by PMTs, and an Outer Veto above these made of crossed scintillator strips. Muons are reconstructed by their Outer Veto hit positions along with timing information from the other two detector volumes. All muons are fit under the hypothesis that they are through-going and ultrarelativistic. If the energy depositions suggest that the muon may have stopped, the reconstruction fits also for this hypothesis and chooses between the two via the relative goodness-of-fit. In the ideal case of a through-going muon intersecting the center of the detector, the resolution is ~40 mm in each transverse dimension. High quality muon reconstruction is an important tool for reducing the impact of the cosmogenic isotope background in Double Chooz.
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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