16,160 research outputs found
Aspectos na produĆ§Ć£o de novilhos jovens.
Esta publicaĆ§Ć£o traz informaƧƵes sobre a produĆ§Ć£o de novilhos apresentando os seguintes tĆ³picos: limitaƧƵes e perspectivas do desempenho dos sistemas de produĆ§Ć£o de gado de corte; AnĆ”lise econĆ“mica de sistemas alternativos de produĆ§Ć£o de novilho precoce em comparaĆ§Ć£o com sistemas tradicionais; Sistemas de produĆ§Ć£o de novilho precoce; ExploraĆ§Ć£o do crescimento; Formas de manipulaĆ§Ć£o do crescimento; Alimentos Concentrados; ManipulaĆ§Ć£o do crescimento atravĆ©s da restriĆ§Ć£o alimentar; ManipulaĆ§Ć£o do crescimento atravĆ©s de alimentaĆ§Ć£o em creep feeding; ImplicaƧƵes.bitstream/item/54347/1/doc94-producaodenovilhosjovens.pd
Extension of Tycho catalog for low-extinction windows in the galactic bulge
We present in this work secondary catalogs up to based on
the Tycho reference frame (ESA, 1997) for 12 selected low-extinction fields
towards the galactic bulge. The observations have been performed with the
Askania-Zeiss Meridian Circle equiped with a CCD camera, located at the
Abrah\~ao de Moraes Observatory (Valinhos, Brazil) and operated by the
Institute of Astronomy and Geophysics, S\~ao Paulo University. The presented
catalog, though not complete, has been designed to help in intensive search
programmes (e.g. microlensing and variable searches) and therefore the selected
standards have a high astrometric and photometric ( band, approximately)
quality. The mean precisions obtained were in , 0.013'' in
, 0.030 for the standard deviation in magnitude and 0.0042 for the
magnitude when weighted with the error bars in each night (in the mean, 42
stars for the catalog of each window). Tables B.1 to B.12 are also available in
eletronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr
(130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html.Comment: 16 pages, 6 figures, A&A Latex style. Published in A&A
Stellar variability in low-extinction regions towards the Galactic Bulge
Intensive monitoring of low-extinction windows towards the galactic bulge has
provided in the last years valuable information for studies about the dynamics,
kinematics and formation history of this part of the galaxy, mainly by
characterizing the bulge stellar populations (Paczy\'nski, 1996). Since 1997,
we have been conducting an intensive photometric-astrometric survey of the
galactic bulge, with the monitoring of about 120000 stars in 12 windows
uniformly distributed in galactic latitude and longitude (Blanco & Terndrup,
1989 e Blanco, 1988) never before submitted to this kind of survey. For this
purpose, we have used the IAG/USP CCD Meridian Circle of the Abrah\~ao de
Moraes Observatory. The main objective of this work is the identification and
classification of variable objects. In this work we present the set up and
development of the necessary tools for a project like this and the posterior
analysis of our data. We briefly describe the construction of a program to
organize and detect variables among the observed stars, including real time
alerts (for variations greater than 0.3 magnitudes). The preliminary analysis
after the processing of 76 nights of observation yielded 479 variable stars,
from which 96.7 % of them are new. We discuss the preliminary classification of
this variables, based on: a) the observed amplitude of variation; b) the shape
of light curve; c) the expected variable classes among our data and d) the
calculated periods, whenever possible. Finally, we discuss the future
perspectives for the project and for the applications and analysis of the
discovered variable stars.Comment: 10 pages, 14 figures. Accepted by A&A
AvaliaĆ§Ć£o social e ambiental de tecnologias da Embrapa: Sistema Ambitec-Agro.
Resumo: AplicaĆ§Ć£o do Sistema Ambitec-Agro - software composto por um conjunto de planilhas que integram critĆ©rios e indicadores ambientais e sociais na avaliaĆ§Ć£o de tecnologias -, para comparar os impactos ambientais da transiĆ§Ć£o agroecolĆ³gica da produĆ§Ć£o de carne bovina convencional para orgĆ¢nica em unidades de produĆ§Ć£o no Brasil
Combining exclusive semi-leptonic and hadronic B decays to measure |V_ub|
The Cabibbo-Kobayashi-Maskawa matrix element |V_ub| can be extracted from the
rate for the semi-leptonic decay B -> pi + l + antineutrino_l, with little
theoretical uncertainty, provided the hadronic form factor for the B -> pi
transition can be measured from some other B decay. In here, we suggest using
the decay B -> pi J\psi. This is a color suppressed decay, and it cannot be
properly described within the usual factorization approximation; we use instead
a simple and very general phenomenological model for the b d J\psi vertex. In
order to relate the hadronic form factors in the B -> pi J\psi and B -> pi + l
+ antineutrino_l decays, we use form factor relations that hold for
heavy-to-light transitions at large recoil.Comment: Latex, 7 pages, no figure
Genetic gain in an improvement program of irrigated rice in Minas Gerais.
An evaluation of the genetic improvement programme of irrigated rice of Minas Gerais (Brazil) estimated the genetic gain obtained in the 90s. Grain yield data of the advanced comparative trials of cultivars and lines of continuously flooded rice, conducted from 1990-91 to 2000-01, were used. The estimate of the genetic gain was obtained by the methodology of the adjusted means proposed by Breseghello (1998). The mean annual genetic gain in the 90s was 42.45+or-17.89 kg ha-1 (0.7% per year). The improvement programme proved auspicious for the development of lines that outmatched the controls. The mean of the cultivars released in the 90s did however not outstrip the mean of the elite lines, which were the genotypes with the highest means in this study and will be further evaluated in the ongoing programme
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