Now showing items 1-10 of 140
Microstructural characterization of Ti-added ultra-low carbon interstitial-free steel submitted by drawing test
(Electron Microscopy 1998, Vol 2, 1998-01-01) [Trabalho apresentado em evento]
Código computacional para análise de sistemas de cogeração com turbinas a gás
(1998) [Tese de doutorado]
Este trabalho apresenta as fases do desenvolvimento de um programa computacional elaborado com a finalidade de selecionar, dimensionar e especificar sistemas de cogeração com turbinas a gás, buscando satisfazer as demandas ...
ANOMALIES IN CURVED SPACETIME AT FINITE TEMPERATURE
(Physical Review D, 1992-12-15) [Artigo]
We discuss the problem of the breakdown of conformal and gauge symmetries at finite temperature in curved-spacetime background, when the changes in the background are gradual, in order to have a well-defined quantum field ...
HEAT-KERNEL EXPANSION AT FINITE TEMPERATURE
(Physical Review D, 1992-01-15) [Artigo]
We show how the zero-temperature result for the heat-kernel asymptotic expansion can be generalized to the finite-temperature one. We observe that this general result depends on the interesting ratio square-root tau/beta, ...
Conservation laws for non-potential operators
(Revista Brasileira de Ciencias Mecanicas/Journal of the Brazilian Society of Mechanical Sciences, 1999-12-01) [Artigo]
A study was developed in order to build a function M invariant in time, by means of Hamiltonian's formulation, taking into account the equation associated to the problem, showing that starting from this function the equation ...
THE PARTITION-FUNCTION FOR AN ANYON-LIKE OSCILLATOR
(Journal of Physics A: Mathematical and General, 1995-01-07) [Carta]
We compute the partition function of an anyon-like harmonic oscillator. The well known results for both the bosonic and fermionic oscillators are then re-obtained as particular cases of our function. The technique we employ ...
Study of the mechanical stability of HMDSN plasma polymerized thin films.
(Abstracts of Papers of the American Chemical Society, 1997-04-13) [Resumo]
Relations between two-dimensional models from dimensional reduction
(Physical Review D: Particles, Fields, Gravitation and Cosmology, 1998-12-15) [Artigo]
In this work we explore the consequences of dimensional reduction of the 3D Maxwell-Chern-Simons and some related models. A connection between topological mass generation in 3D and mass generation according to the Schwinger ...
Thermoeconomic analysis: A criterion for the selection of cogeneration systems
(American Society of Mechanical Engineers, Advanced Energy Systems Division (Publication) AES, 1996-12-01) [Artigo]
The economical viability of three cogeneration schemes as supplying alternatives for a hypothetical industrial process has been studied. A cost appropriation method based on Valero's studies (1986) has been used. This ...
Theoretical investigation of the electronic structure and absorption spectra of carbon cluster nanotubes
(Nanostructured Materials, 1994-01-01) [Artigo]
Electronic and optical properties of recently discovered single-shell carbon cluster nanotubes are studied through a semiempirical INDOCI method. The calculations are performed within the cluster model and include up to ...