Chaves, M., Galaktionov, V. A.
Local oscillatory and other properties of source-type solutions of doubly nonlinear sixth-order parabolic thin film equations are studied.
Renormalization of a modified gravity with a quadratic Riemann tensor term (2008)
We consider a modified form of gravity, which has an extra term quadratic in the Riemann tensor. This term mimics a Yang-Mills theory. The other defining characteristic of this gravity is having the...
Chaves, M., Cardoso, A., Almeida, C.
Abstract of the article referenced in the citation field. Original in Portuguese.
Chaves, M., Cardoso, A., Almeida, C.
O resumo do artigo que é referido no campo da citação. Original em Português.
Chaves, M., Cardoso, A., Almeida, C.
Resumen de artículo referido en la cita bibliográfica. Original en Portugués.
Poster Submission Title: Preservation of bistability in the reduction of an apoptosis model (2008)
Steffen Waldherr, Thomas Eissing, Madalena Chaves, S. Waldherr, T. Eissing, M. Chaves, ...
Contact
Minimal Blow-up Asymptotics of Quasilinear Heat Equations (2007)
M. Chaves, Victor A. Galaktionov
We study the asymptotic properties of blow-up solutions u = u(x; t) 0 of the quasilinear heat equation u t = (k(u)u x ) x ; x > 0; t 2 (0; 1); where k(u) is a smooth nonnegative function, with a...
Universal decay of scalar turbulence (2007)
Chaves, M., Eyink, G., Frisch, U., Vergassola, M.
The asymptotic decay of passive scalar fields is solved analytically for the Kraichnan model, where the velocity has a short correlation time. At long times, two universality classes are found, both...
J. Math. Biol. DOI 10.1007/s00285-008-0230-y Mathematical Biology (2007)
Madalena Chaves, Anirvan Sengupta, Eduardo D. Sontag, M. Chaves, A. Sengupta
Geometry and topology of parameter space: investigating measures of robustness in regulatory networks
Explaining schism in American protestant denominations, 1890-1990 (2004)
The remarkable degree of religious diversity in the United States is produced more through schisms and mergers occurring to preexisting denominations than through foundings of new religious groups....
Organizational consolidation in American protestant denominations, 1890-1990 (2004)
The religious sector in the United States is distinctive for the degree to which institutional change occurs not through the birth and death of organizations, but through mergers and schisms...
Yang-Mills theories using only extended fields (vectorial and scalar) as gauge fields (2003)
A few years ago H. Morales and the author introduced a type of generalized derivative that contained both vector and scalar boson fields. Here it is shown how to construct a full-fledged generalized...
An introduction to generalized Yang-Mills theories (2001)
In generalized Yang-Mills theories scalar fields can be gauged just as vector fields in a usual Yang-Mills theory, albeit it is done in the spinorial representation. The presentation of these...
Universal decay of scalar turbulence (2000)
Chaves, M., Eyink, G., Frisch, U., Vergassola, M.
The asymptotic decay of passive scalar fields is solved analytically for the Kraichnan model, where the velocity has a short correlation time. At long times, two universality classes are found, both...
Grand unification using a generalized Yang-Mills theory (1999)
Generalized Yang-Mills theories have a covariant derivative that employs both scalar and vector bosons. Here we show how grand unified theories of the electroweak and strong interactions can be...
The Standard Model and the Generalized Covariant Derivative (1999)
The generalized covariant derivative, that uses both scalar and vector bosons, is defined. It is shown how a grand unified theory of the Standard Model can be constructed using a generalized...
This paper has been withdrawn by the author because the conclusions reached in it are incorrect.
Programs with Stringent Performance Objectives Will Often Exhibit Chaotic Behavior (1999)
Software for the resolution of certain kind of problems, those that rate high in the Stringent Performance Objectives adjustment factor (IFPUG scheme), can be described using a combination of game...
Some mathematical considerations about generalized Yang-Mills theories (1998)
Generalized Yang-Mills theories are constructed, that can use fields other than vector as gauge fields. Their geometric interpretation is studied. An application to the Glashow-Weinberg-Salam model...
A Charged Inflaton leaves Behind a Fractal Primeval Structure of Electromagnetic Fields (1998)
The inflaton field is assumed to possess electric charge. The effect of the charge upon inflation is studied using a parameter \omega_0 that acts as a measure of the quantity of inflaton present. It...
Chess Pure Strategies are Probably Chaotic (1998)
It is odd that chess grandmasters often disagree in their analysis of positions, sometimes even of simple ones, and that a grandmaster can hold his own against an powerful analytic machine such as...
Unification of SU(2)xU(1) Using a Generalized Covariant Derivative and U(3) (1998)
A generalization of the Yang-Mills covariant derivative, that uses both vector and scalar fields and transforms as a 4-vector contracted with Dirac matrices, is used to simplify and unify the...
Boson metastable ground states with spontaneous symmetry breaking (1997)
We show that a system of bosons in a T=0 quantum field theory can present metastable ground states with spontaneous symmetry breaking, even in the absence of an imaginary mass term. This gives a...
The role of abscisic acid and water relations in drought responses of subterranean clover (1997)
Socias, X., Correia, M.J., Chaves, M., Medrano, H.
The role of water relations and abscisic acid (ABA) in the responses to drought were studied in a mediterranean forage crop, Trifolium subterraneum L. under field conditions. Soil and plant water...
Abadía, Armando, Cadahia, C., Casado, M., Chaves, M., Lachica, M., Lasala, M., ...
21 páginas, 8 tablas.-- Los autores forman "La Comisión de Métodos Analíticos del Instituto Nacional de Edafología y Agrobiología José M.ª Albareda.
Chaves, M, Smith, M W, Williamson, R C
The ability of adapting ileal enterocytes to express different digestive enzymes in their brush border membranes was tested in young female Wistar rats (n = 72) receiving 60% proximal small bowel...