Efeito da irrigação sobre o rendimento de grãos de duas cultivares de trigo em três épocas de semeadura.

bitstream/item/66141/1/CPAO-PESQ.-AND.-4-80.pd

Zoneamento para o cultivo do arroz irrigado em Mato Grosso do Sul.

bitstream/item/24417/1/COT2005116.pdfDocumento on-line

Faculty Perceptions Regarding Developmental Education: A Phenomenological Study

In this study, a transcendental phenomenological approach was used to explore faculty members’ experiences with and perceptions of developmental education. This study was conducted at a small, open-access university in the Midwest and included the experiences and perspectives of faculty who teach developmental education courses, as well as those who teach non-developmental education courses at this university. Five non-developmental education faculty and four developmental education faculty were interviewed. The interviews were transcribed and a phenomenological reduction approach was used to analyze the data. Results from the analysis process were used to write a textural description of the non-developmental education and developmental education faculty’s experiences with developmental education. Faculty perceptions and experiences were compared to see if both faculty groups had a shared experience with developmental education

Development of the electroweak phase transition and baryogenesis

We investigate the evolution of the electroweak phase transition, using a one-Higgs effective potential that can be regarded as an approximation for the Minimal Supersymmetric Standard Model. The phase transition occurs in a small interval around a temperature T_t below the critical one. We calculate this temperature as a function of the parameters of the potential and of a damping coefficient related to the viscosity of the plasma. The parameters that are relevant for baryogenesis, such as the velocity and thickness of the walls of bubbles and the value of the Higgs field inside them, change significantly in the range of temperatures where the first-order phase transition can occur. However, we find that in the likely interval for T_t there is no significant variation of these parameters. Furthermore, the temperature T_t is in general not far below the temperature at which bubbles begin to nucleate.Comment: 26 pages, 7 figures; typos corrected, reference adde

Elaboração das curvas de congelação e dependência entre a depressão do ponto de congelamento e a atividade de água em sucos de fruta

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High Temperature Matter and Gamma Ray Spectra from Microscopic Black Holes

The relativistic viscous fluid equations describing the outflow of high temperature matter created via Hawking radiation from microscopic black holes are solved numerically for a realistic equation of state. We focus on black holes with initial temperatures greater than 100 GeV and lifetimes less than 6 days. The spectra of direct photons and photons from $\pi^0$ decay are calculated for energies greater than 1 GeV. We calculate the diffuse gamma ray spectrum from black holes distributed in our galactic halo. However, the most promising route for their observation is to search for point sources emitting gamma rays of ever-increasing energy.Comment: 33 pages, 13 figures, to be submitted to PR

Calculation of the emergent spectrum and observation of primordial black holes

We calculate the emergent spectrum of microscopic black holes, which emit copious amounts of thermal ``Hawking'' radiation, taking into account the proposition that (contrary to previous models) emitted quarks and gluons do not directly fragment into hadrons, but rather interact and form a photosphere and decrease in energy before fragmenting. The resulting spectrum emits copious amount of photons at energies around 100MeV. We find that the limit on the average universal density of black holes is not significantly affected by the photosphere. However we also find that gamma ray satellites such as EGRET and GLAST are well suited to look for nearby black holes out to a distance on the order of 0.3 parsecs, and conclude that if black holes are clustered locally as much as luminous matter, they may be directly detectable.Comment: 10 pages, Latex, submitted to PR

Black Hole Chromosphere at the LHC

If the scale of quantum gravity is near a TeV, black holes will be copiously produced at the LHC. In this work we study the main properties of the light descendants of these black holes. We show that the emitted partons are closely spaced outside the horizon, and hence they do not fragment into hadrons in vacuum but more likely into a kind of quark-gluon plasma. Consequently, the thermal emission occurs far from the horizon, at a temperature characteristic of the QCD scale. We analyze the energy spectrum of the particles emerging from the "chromosphere", and find that the hard hadronic jets are almost entirely suppressed. They are replaced by an isotropic distribution of soft photons and hadrons, with hundreds of particles in the GeV range. This provides a new distinctive signature for black hole events at LHC.Comment: Incorporates changes made for the version to be published in Phys. Rev. D. Additional details provided on the effect of the chromosphere in cosmic ray shower