2,284 research outputs found
Luteal function in jennies following PGF2alpha treatment 3 days after ovulation
No full textNative PGF2a and its analogs have been used in the horse mare to manipulate ovarian activity, primarily as luteolytic agents toinduce estrus. Despite numerous studies on the effects of these luteolysins in the mare, to date only a single investigation has beenconducted in the jenny. The aim of this study was to evaluate the response of the corpus luteum (CL) to a single dose of PGF2a given3 days (72 h) after ovulation and to establish the plasma progesterone (P4) profile from pre-treatment to post-treatment ovulation inthe Martina Franca donkey. Twenty-two jennies were ultrasonographically monitored and treated 72 h after the detection ofovulation with 0.075 mg i.m. of R-cloprostenol. From the day of ovulation until ovulation post-treatment, blood was collected dailyfor P4 determination by enhanced luminescence immunoassay. All the jennies except one, exhibited behavioral signs of PGF2ainducedestrus within 4 days of treatment lasting 5.4 1.16 days. Post-treatment ovulation was also hastened, reducing theinterovulatory interval (9.6 days). In response to treatment, plasma P4 concentrations fell to estrus levels and then remained constantuntil the next ovulation in all but the non-responding animal. Our findings indicate that PGF2a treatment on Day 3 post-ovulationcauses the functional regression of the CL in the jenny, reflected both by the rapid induction of estrus and ovulation and by an abruptdrop in circulating P4 concentrations.[...
RATS: an Italian project for exoplanets transit search
No full textThe automatic photometric pipeline provides a real time images reduction and directly the light curves of object in the field within the RATS project (RAdial Velocities Transit Search). The light curves themselves will be analyzed in order to catch light dimming due to a transit. For this purpose, the algorithm needs as input files a list of fits images taken at Schmidt Telescope of Asiago (INAF, Italy), a reference master list of stars and three files with the optional parameters for the DAOPHOT photometry package (Stetson 1987, PASP, 99, 191). The master list is previously obtained from a photometric characterization of the field (for more details: http://www.rats.it and Claudi et al. 2006, in Observatoire de Haute Provence Colloquium, Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies, 22-25 August 2005, eds. Arnold, L., Bouchy, F. and Moutou, C., 350)
Citrato e fruttosio nel plasma seminale di stallone e caratteristiche del materiale seminale
No full textFrédérique Amselle. Virginia Woolf et les écritures du moi : le journal et l’autobiographie
No full textOf the many, often tremendous, U-turns in literary theory and criticism since the infamous “death of the author”, the most challenging is perhaps the recent shift of focus from mainstream, finished, commercially successful works to memoirs, correspondence, first drafts and diaries. The result has not of course been a return to a pre-structuralist “life and times” approach to an artist and their work, but a focus on the various ways in which secondary or marginal writings can be seen to contri..
Search for b→u transitions in B±→[K∓π±π0]DK± decays
No full textWe present a study of the decays B±→DK± with D mesons reconstructed in the K+π-π0 or K-π+π0 final states, where D indicates a D0 or a D̅ 0 meson. Using a sample of 474×10^6 BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we measure the ratios R±≡Γ(B±→[K∓π±π0]DK±)/Γ(B±→[K±π∓π0]DK±). We obtain R+=(5-10+12(stat)-4+2(syst))×10-3 and R-=(12-10+12(stat)-5+3(syst))×10-3, from which we extract the upper limits at 90% probability: R+<23×10-3 and R-<29×10-3. Using these measurements, we obtain an upper limit for the ratio rB of the magnitudes of the b→u and b→c amplitudes rB<0.13 at 90% probability
Search for b --> u Transitions in B^{+-} --> [K^{-+} pi^{+-} pi0]_D K^{+-} Decays
No full text9 pages, 11 postscript figures, submitted to Physical Review DWe present a study of the decays B^{+-} --> D K^{+-} with D mesons reconstructed in the K+pi-pi0 or K-pi+pi0 final states, where D indicates a D0 or a anti-D0 meson. Using a sample of 474 million BBbar pairs collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC we obtain R^{+} = (5^{+12}_{-10}(stat) ^{+2}_{-4}(syst))\times10^{-3} and R^{-} = (12^{+12}_{-10}(stat) ^{+3}_{-5}(syst))\times10^{-3}, from which we extract the upper limits at 90% probability: R^+ u and b --> c amplitudes r_B<0.13 at 90% probability
Search for R-parity violation with a anti-U anti-D anti-D coupling at x**(1/2) = 189-GeV
No full textSearches for pair production of gauginos and squarks in e(+)e(- ) collisions at a centre-of-mass energy of 189 GeV have been performed on data corresponding to an integrated luminosity of 158 pb(-1) collected by the DELPHI detector at LEP. The data were analyzed under the assumption of non-conservation of R- parity through a single dominant (U) over bar(D) over bar(D) over bar coupling between squarks and quarks. Typical final states contain between 4 and 10 jets with or without additional leptons. No excess of data above Standard Model expectations was observed. The results were used to constrain domains of the MSSM parameter space and derive limits on the masses of supersymmetric particles. The following mass limits at 95% CL were obtained from these searches: neutralino mass: m([([chi])over tilde]1)(0) greater than or equal to 32 GeV; chargino mass: m([([chi])over tilde]1)(+) greater than or equal to 94 GeV; stop and sboctom mass (indirect decay) with DeltaM gt 5 GeV: m((t) over tilde1) greater than or equal to 74 GeV for Phi (mix) = 0 rad, m((t) over tilde1) greater than or equal to 59 GeV for Phi (mix) = 0.98 rad, m((b) over tilde1) greater than or equal to 72 GeV for Phi (mix) = 0 rad. The angle phi (mix) is the mixing angle between left and right handed quarks
Search for b -> u transitions in B- -> DK- and D*K- decays
No full textWe report results from an updated study of the suppressed decays We report results from an updated study of the suppressed decays B- -> DK- and B- -> D*K- followed by D -> K+ pi(-), where D-(*()0) indicates a D-(*()0)or a (D) over bar (()*()0) meson, and D* -> D pi(0) or D* -> D gamma. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle gamma due to interference between the b -> c transition B- -> D-(*K-)0(-) followed by the doubly Cabibbo-suppressed decay D-0 -> K+ pi(-), and the b -> u transition B- -> (D) over bar (()*()0) K- followed by the Cabibbo-favored decay (D) over bar (0) -> K+ pi(-). We also report an analysis of the decay B- -> D-(*())pi(-) with the D decaying into the doubly Cabibbo-suppressed mode D -> K+ pi(-). Our results are based on 467 x 10(6) Gamma(4S) -> BB- decays collected with the BABAR detector at SLAC. We measure the ratios R-(*()) of the suppressed ([K+ pi(-)](D)K- / pi(-)) to favored ([K+ pi(-)](D)K- / pi(-)) branching fractions as well as the CP asymmetries A(()*()) of those modes. We see indications of signals for the B- -> DK- and B- -> D-D pi 0(()*()) K- suppressed modes, with statistical significances of 2.1 and 2.2 sigma, respectively, and we measure: R-DK = (1.1 +/- 0: 6 +/- 0.2) x 10(-2); A(DK) = -0.86 +/- 0: 47(-0.16)(+0.12), R-(D pi 0)K* = (1.8 +/- 0: 9 +/- 0: 4) x 10(-2); A ((D pi 0)K)* = +0.77 +/- 0: 35 +/- 0.12; R-(D gamma)K* = (1.3 +/- 1.4 +/- 0.8) x 10(-2); A((D gamma)K)* = +0.36 +/- 0: 94(-0.41)(+0.25), where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio r(B) equivalent to vertical bar A(B- -> (D) over bar 0K(-))/A(B- -> (DK-)-K-0)vertical bar = (9.5(-4.1)(+5.1))%, with r(B) D*K- we find r(B) equivalent to vertical bar A(B- -> 0K(-))/A(B- -> (DK-)-K-0)vertical bar = (9.6(-5.1)(+3.5))%, with r(B)* < 15.0% at 90% confidence level
A wrinkling model based on material modification for isotropic and orthotropic membranes
No full textThe intrinsic inability to withstand compression is a challenge in numerical simulation of a membrane with the finite element method. Basically there are two possibilities to deal with this problem. On the one hand wrinkles would be detected in detail by a refined mesh of shell elements once a bending formulation is used. On the other hand this problem is computed on a coarser mesh of membrane elements augmented with a wrinkling model, which considers effects of unresolved deformation patterns. This contribution focuses on the material modification approach, which is considered as a member of the latter. Within this category, works in [P. Contri, B.A. Schrefler, A geometrically nonlinear finite element analysis of wrinkled membrane surfaces by a no-compression material model, Commun. Appl. Numer. Methods 4 (1988) 5–15; X. Liu, C.H. Jenkins, W.W. Schur, Large deflection analysis of pneumatic envelopes using a penalty parameter modified material model, Finite Elements Anal. Des. 37 (2001) 233–251; X. Liu, Fine scale analysis of wrinkled membrane, Int. J. Numer. Comput. Engrg. Sci. 1 (2) (2000) 1017–1038; R. Rossi, M. Lazzari, R. Vitaliani, E. Onate, Simulation of light-weight membrane structures by wrinkling model, Int. J. Numer, Methods Engrg. 62 (15) (2005) 2127–2153; R. Rossi, E. Onate, Convergence of the modified material model for wrinkling simulation of light-weight membrane structures, in: E. Onate, B. Kröpin (Eds.), Textile Composites and Inflatable Structures (Structural Membranes 2003), CIMNE, 2003; R. Rossi, Light Weight Structures: Structural Analysis and Coupling Issues, Ph.D. Diss., The university of Bologna, 2005] are attractive because their wrinkling models on a coarse grid are simple and intuitive. The basic idea of this model is as follows: whenever compression occurs in a membrane, the corresponding components of the constitutive tensor in the direction of the compressive stress are penalized to weaken the compressive stiffness of the membrane. However, such abrupt change causes inevitably an unphysical oscillation of stress redistribution. Therefore, an algorithm to stabilize this oscillation is required. The first objective of this paper is to give a systematic verification of a wrinkling model based on the material modification approach by means of an analogy between wrinkling and plasticity. The second one is to include this model in a static analysis for both isotropic and orthotropic membranes. This model holds following advantages: it is computationally inexpensive and virtually able to reproduce the exact stress field, caused by wrinkling, on a macroscopic scale. To the author’s knowledge applications of a material modification approach with orthotropic materials are scarcely available. This paper demonstrates the potential of the model by means of numerical examples, compared to ones in literature
Otimização de sistemas de atendimento emergenciais utilizando a teoria das filas e diagrama de voronoi ponderado
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-graduação em Engenharia de ProduçãoEste trabalho trata do problema de localização ótima de Estações de Emergência, localizadas no Corpo de Bombeiros, em que é necessário calcular o número de ambulâncias em cada estação, para atender a população de uma determinada região. Esse procedimento é realizado por meio da teoria das filas, devendo-se, para isso, considerar: o tempo médio de deslocamento da ambulância até a ocorrência, o número de chamadas diárias extremas para cada estação e também o tempo de espera na fila. O tempo médio de deslocamento é calculado pela teoria dos valores extremos, em que se considera somente o maior valor observado em cada dia. O tempo de espera, na fila, deve ser atribuído pelos administradores, podendo ser maior ou menor, dependendo, muitas vezes, de recursos financeiros. Neste trabalho, é considerado um tempo de espera, na fila, de um minuto e, para o deslocamento, de quatro minutos, num total de cinco minutos, podendo esse valor ser alterado para outras situações. Pelo diagrama de Voronoi multiplicativo por pesos, é realizada a divisão da área em estudo, nesse caso, a cidade de Curitiba-PR, onde há nove estações de emergência, sendo que cada ponto de estação será considerado como centro gerador de regiões. A otimização das colocações das estações é realizada com os modelos contínuos minmax e minmaxmin por meio do método simplex, em que é otimizado cada ponto de localização da Estação do Corpo de Bombeiros. A abordagem permite calcular, para um determinado conjunto de dados, o número suficiente de ambulâncias sem que haja limitação com relação à quantidade de unidades, o que dispensa o uso de simulação. Sendo assim, a metodologia apresentada é um instrumento que pode ser aplicado para qualquer região, desde que se tenham os dados relativos às ocorrências e os tempos de deslocamento, registrados num período considerado. Os algoritmos e software utilizados demonstraram uma boa performance para os modelos usados, contribuindo para a melhoria do sistema e rapidez no atendimento emergencial
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