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Search Results: 1 - 10 of 59 matches for " Wyler "
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Que censura?
Wyler, Lia;
DELTA: Documenta??o de Estudos em Lingüística Teórica e Aplicada , 2003, DOI: 10.1590/S0102-44502003000300007
Abstract: those who do research in the area of translation history can profit from a knowledge of brazilian history and its methodology as well as from the authors who comment on different periods of their special interest. this knowledge can help them identify the effects of censorship and the development of translations produced during the vargas era (1939-53) which marks the industrialization of translation in brazil.
Que censura?
Wyler Lia
DELTA: Documenta??o de Estudos em Lingüística Teórica e Aplicada , 2003,
Abstract: Os pesquisadores na área de História da Tradu o podem se beneficiar do conhecimento de História do Brasil e sua metodologia, bem como dos autores que comentam o período de seu interesse. No que tange a Era Vargas (1930-53), marco fundador da tradu o industrial brasileira, esse conhecimento lhes permitirá perceber com maior facilidade os efeitos da censura e seus desdobramentos nas tradu es produzidas à época e mesmo em outras épocas.
CP violation, the CKM matrix and New Physics
Daniel Wyler
Physics , 2001,
Abstract: Loop corrections for physics beyond the Standard Model are computed. DWe discuss the influence of new physics on CP-violating observables. Assuming the standard model gives a correct description of tree level processes, we show how a consistent procedure can determine the parameters of the standard model and check its validity also in loop induced processes. A method to include new physics in a systematic way is sketched.
Molecular and cellular basis of hepatic fibrogenesis in experimental schistosomiasis mansoni infection
Wyler, David J.;
Memórias do Instituto Oswaldo Cruz , 1992, DOI: 10.1590/S0074-02761992000800017
Abstract: morbidity in schistosomiasis mansoni occurs primaryly as a result of the complications of hepatic fibrosis. yet, the pathogenesis of schistosomal hepatic fibrosis is poorly understood. the fact that hepatic egg granuloma is the hallmark of this infection suggests a potential role for granulomatous inflamation in hepatic fibrogenesis. our studies in a murine schistosomiasis model indicate that hepatic granuloma cells secrete a variety of fibrogenic cytokines that may initiate the scarring process. among these cytokines, we identified a novel protein that we designated fibroplast stimulating factor-1 (fsf-1). fsf-1 is a lymphokine that can stimulate fibroplast growth and matrix synthesis. a notable feature of hepatic fibrosis in this model is that production of fsf-1 and other granuloma-derived fibrogenic cytokines is down-regulated in chronic infection, an event that may be under immunological control. the spontaneous reduction of fsf-1 secretion presumably accounts for reduced scar formation late in infection of mice. in the context of relevant clinical studies, our findings engender the hypothesis that symmer's fibrosis may develop in a small suppopulation of individuals as a result of immunogenetically-determined dysregulation of fibrogenic cytokine production.
Astro Unparticle Physics
Freitas, A.;Wyler, D.
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/1126-6708/2007/12/033
Abstract: We investigate the effects of all flavor blind CP-conserving unparticle operators on 5th force experiments, stellar cooling, supernova explosions and compare the limits with each other and with those obtainable from collider experiments. In general, astrophysical bounds are considerably stronger, however they depend strongly on the dimension d_U of the unparticle operator. While for d_U=1, 5th force experiments yield exceedingly strong bounds, the bounds from stellar and supernova cooling are more comparable for d_U=2, with stellar cooling being most restrictive. Bounds on vectorial unparticle couplings are generally stronger than those on scalar ones.
Unitary Background Gauges and Hamiltonian approach to Yang--Mills Theories
A. Dubin,D. Wyler
Physics , 1995,
Abstract: A variety of unitary gauges for perturbation theory in a background field is considered in order to find those most suitable for a Hamiltonian treatment of the system. We select two convenient gauges and derive the propagators $D_{\mu\nu}$ for gluonic quantum fluctuations immersed in background configurations. The first one is a unitary generalization of the usual Coulomb gauge in QED which preserves the decoupling of two propagating polarizations from the instantaneous one. The second possibility is the axial light cone gauge which remains ghost free also in the presence of a background. Applications of the formalism to the spectrum and dynamics of QCD at the confinement scale, such as hybrid states, are briefly discussed.
Exploring CP Violation with $B_c$ Decays
Robert Fleischer,Daniel Wyler
Physics , 2000, DOI: 10.1103/PhysRevD.62.057503
Abstract: We point out that the pure ``tree'' decays $B_c^\pm\to D^\pm_s D$ are particularly well suited to extract the CKM angle $\gamma$ through amplitude relations. In contrast to conceptually similar strategies using $B^\pm\to K^\pm D$ or $B_d\to K^{\ast0} D$ decays, the advantage of the $B_c$ approach is that the corresponding triangles have three sides of comparable length and do not involve small amplitudes. Decays of the type $B_c^\pm\to D^\pm D$ -- the $U$-spin counterparts of $B_c^\pm\to D^\pm_s D$ -- can be added to the analysis, as well as channels, where the $D^\pm_s$- and $D^\pm$-mesons are replaced by higher resonances.
CP Violation, Neutrino Mixing and the Baryon Asymmetry
W. Buchmuller,D. Wyler
Physics , 2001, DOI: 10.1016/S0370-2693(01)01211-4
Abstract: We study neutrino masses and mixings based on the simplest SO(10) mass relations and the seesaw mechanism. We find that the requirement of large neutrino mixings determines the relative magnitude of the heavy Majorana neutrino masses in terms of the known quark mass hierarchy. This leads to specific predictions for the structure of the neutrino mixing matrix, the light neutrino masses, CP violation in neutrino oscillations, neutrinoless double b-decay and the baryon asymmetry.
Constraints on the Universal Contact Interaction
Wilfried Buchmuller,Daniel Wyler
Physics , 1997, DOI: 10.1016/S0370-2693(97)00734-X
Abstract: Forces beyond those of the standard model may manifest themselves at low energies as four-fermion contact interactions. If these new forces are independent of colour and flavour quantum numbers including baryon and lepton number, then all low energy constraints, arising from quark-lepton universality, flavour-changing neutral currents and atomic parity violation are evaded. This is due to the global U(45) symmetry which the standard model exhibits in the limit of vanishing gauge and Yukawa couplings. The corresponding contact interaction is a unique current-current interaction. Constraints from LEP2 imply that this universal contact interaction cannot be the origin of the recently observed high-$Q^2$ events at HERA.
Counting contact terms in $B\to Vγ$ decays
Alexander Khodjamirian,Daniel Wyler
Physics , 2001,
Abstract: We clarify the origin and cancellation of contact terms in the weak annihilation amplitudes contributing to $B\to V \gamma$. It is demonstrated that the photon emission from the final-state quarks vanishes in the chiral limit of massless quarks. The contact terms in the QCD light-cone sum rule evaluation of the weak annihilation amplitudes are also discussed.
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