1,755 research outputs found
High resolution spectroscopy of H II Galaxies: Structure and Supersonic line widths
We present high resolution echelle spectroscopy of a sample of H II galaxies.
In all galaxies we identify different H(alpha) emitting knots along the slit
crossing the nucleus. All of these have been isolated and separately analyzed
through luminosity and size vs diagnosis plots. We find that in all cases, for
a particular galaxy, the bulk of emission comes from their main knot and
therefore, at least for the compact class galaxies we are dealing with,
luminosity and sigma values measured using single aperture observations would
provide similar results to what is obtained with spatially resolved
spectroscopy. In the size vs plots as expected there is a shift in the
correlations depending on whether we are including all emission in a single
point or we split it in its different emitting knots. The problem of a proper
determination of the size of the emitting region so that it can be used to
determine the mass of the system remains open. From the data set gathered,
using the highest surface brightness points as recently proposed by
Fuentes-Masip et al. (2000), the best luminosity vs correlation turns out to be
consistent with a Virial model.Comment: 14 pages, 4 figures, ApJ accepted. Also available from
http://www.daf.on.br/~etelles/papers/wht.ps.g
Triomensional plasticity using BIEM
This paper presents the application of BIE techniques to elastoplastic three-dimensional problems. Along with the general procedures the needed integrations are described in detail and so is the flow chart of the written program
Stellar Populations Found in the Central kpc of Four Luminous Compact Blue Galaxies at Intermediate Redshift
We investigate the star formation history of the central regions of four
Luminous Compact Blue Galaxies (LCBGs). LCBGs are blue (B-V<0.6), compact
(MU_B<21.5 mag arcsec^-2) galaxies with absolute magnitudes M_B brighter than
-17.5. The LCBGs analyzed here are located at 0.436<z<0.525. They are among the
most luminous (M_B < -20.5), blue (B-V < 0.4) and high surface brightness (MU_B
< 19.0 mag arcsec^-2) of this population. The observational data used were
obtained with the HST/STIS spectrograph, the HST/WF/PC-2 camera and the
HST/NICMOS first camera. We find evidence for multiple stellar populations. One
of them is identified as the ionizing population, and the other one corresponds
to the underlying stellar generation.
The estimated masses of the inferred populations are compatible with the
dynamical masses, which are typically 2--10x 10^9 M_sun. Our models also
indicate that the first episodes of star formation the presented LCBGs
underwent happened between 5 and 7 Gyr ago.
We compare the stellar populations found in LCBGs with the stellar
populations present in bright, local HII galaxies, nearby spheroidal systems
and Blue Compact Dwarf Galaxies. It turns out that the underlying stellar
populations of LCBGs are similar yet bluer to those of local HII galaxies. It
is also the case that the passive color evolution of the LCBGs could convert
them into local Spheroidal galaxies if no further episode of star formation
takes place. Our results help to impose constraints on evolutionary scenarios
for the population of LCBGs found commonly at intermediate redshifts.Comment: 35 pages, 10 Figures. Accepted for publication in AJ. Compile with
pdflatex. Contains png figure
Coping in Transplantated Patients
O desenvolvimento teórico dos Mecanismos de Coping (MC) tem como base uma dialéctica
relacionada com os seus principais factores determinantes: individuais e situacionais (na
base das duas abordagens do coping: disposicional e constitucional).
Actualmente a classificação dos MC mais utilizada é baseada em duas dimensões: coping
focado na emoção, e coping focado na resolução de problemas.
Considera-se essencial que os métodos de classificação dos MC tenham em conta a coexistência de elementos disposicionais estáveis com uma variabilidade situacional dos MC.
São abordados alguns instrumentos de medição de coping, baseados em diferentes pressupostos teóricos.
O coping pode influenciar a saúde através de vários mecanismos (sistema neuroendócrino,
comportamentos relacionados com os riscos para a saúde e adesão terapêutica) e é incluído em dois dos principais modelos teóricos de saúde (Moos & Schaefer e modelo de Leventhal).
Com base numa revisão da literatura, concluiu-se que os estilos de coping mais prevalentes no pré transplante foram: aceitação, coping activo, e procura de suporte, sendo os menos utilizados: auto culpabilização e evitação. No pós transplante o coping activo e procura
de suporte continuam a ser os estilos de coping preferenciais, a par da confrontação,
autoconfiança, recurso à religião e coping focado no problema.
Os estilos de coping (Evasivo, Emotivo, Fatalistico) estão associados a uma menor capacidade de controlo pessoal sobre a doença, a confrontação a uma maior qualidade de vida, o evitamento à redução da qualidade de vida e ao aumento dos níveis de depressão
e a negação ao aumento da não adesão.
A compreensibilidade, a sensação de controlo sobre a doença, os estilos de coping
«relacionados com a expressão dos afectos» e a negação variam ao longo da evolução do
doente transplantado
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