16 research outputs found
Overdamped van Hove function of atomic liquids
Using the generalized Langevin equation formalism and the process of
contraction of the description we derive a general memory function equation for
the thermal fluctuations of the local density of a simple atomic liquid. From
the analysis of the long-time limit of this equation, a striking equivalence is
suggested between the long-time dynamics of the atomic liquid and the dynamics
of the corresponding \emph{Brownian} liquid. This dynamic equivalence is
confirmed here by comparing molecular and Brownian dynamics simulations of the
self-intermediate scattering function and the long-time self-diffusion
coefficient for the hard-sphere liquid.Comment: 4 Figures, 23 page
Una Aplicación de la Teoría de Juegos Cooperativos a la Descomposición de la Pobreza en México
El presente artículo estima la descomposición de la variación en la pobreza en México aplicando algunos resultados derivados de la teoría de juegos cooperativos. En particular, se utiliza el enfoque del valor Shapley (Shapley 1953) para estimar la contribución del crecimiento, la distribución del ingreso y los precios en la descomposición. La disminución observada en la familia P_alpha de medidas de pobreza durante el periodo 2000-2008 se asocia principalmente al componente crecimiento. Sin embargo, la distribución del ingreso y la inflación tuvieron un papel preponderante en la dinámica de la pobreza para los subperiodos 2000-2002 y 2006-2008, respectivamente.Pobreza, Descomposición, Valores de Shapley
A simulational and theoretical study of the spherical electrical double layer for a size-asymmetric electrolyte: the case of big coions
Monte Carlo simulations of a spherical macroion, surrounded by a
size-asymmetric electrolyte in the primitive model, were performed. We
considered 1:1 and 2:2 salts with a size ratio of 2 (i.e., with coions twice
the size of counterions), for several surface charge densities of the
macrosphere. The radial distribution functions, electrostatic potential at the
Helmholtz surfaces, and integrated charge are reported. We compare these
simulational data with original results obtained from the Ornstein-Zernike
integral equation, supplemented by the hypernetted chain/hypernetted chain
(HNC/HNC) and hypernetted chain/mean spherical approximation (HNC/MSA)
closures, and with the corresponding calculations using the modified
Gouy-Chapman and unequal-radius modified Gouy-Chapman theories. The HNC/HNC and
HNC/MSA integral equations formalisms show good concordance with Monte Carlo
"experiments", whereas the notable limitations of point-ion approaches are
evidenced. Most importantly, the simulations confirm our previous theoretical
predictions of the non-dominance of the counterions in the size-asymmetric
spherical electrical double layer [J. Chem. Phys. 123, 034703 (2005)], the
appearance of anomalous curvatures at the outer Helmholtz plane and the
enhancement of charge reversal and screening at high colloidal surface charge
densities due to the ionic size asymmetry.Comment: 11 pages, 7 figure
Dynamic equivalence between atomic and colloidal liquids
We show that the kinetic-theoretical self-diffusion coefficient of an atomic
fluid plays the same role as the short-time self-diffusion coefficient D_S in a
colloidal liquid, in the sense that the dynamic properties of the former, at
times much longer than the mean free time, and properly scaled with D_S, will
indistinguishable from those of a colloidal liquid with the same interaction
potential. One important consequence of such dynamic equivalence is that the
ratio D_L/ D_S of the long-time to the short-time self-diffusion coefficients
must then be the same for both, an atomic and a colloidal system characterized
by the same inter-particle interactions. This naturally extends to atomic
fluids a well-known dynamic criterion for freezing of colloidal liquids[Phys.
Rev. Lett. 70, 1557 (1993)]. We corroborate these predictions by comparing
molecular and Brownian dynamics simulations on (soft- and hard-sphere) model
systems, representative of what we may refer to as the "hard-sphere" dynamic
universality class
Margarita de Sossa, Sixteenth-Century Puebla de los Ángeles, New Spain (Mexico)
Margarita de Sossa’s freedom journey was defiant and entrepreneurial. In her early twenties, still enslaved in Portugal, she took possession of her body; after refusing to endure her owner’s sexual demands, he sold her, and she was transported to Mexico. There, she purchased her freedom with money earned as a healer and then conducted an enviable business as an innkeeper. Sossa’s biography provides striking insights into how she conceptualized freedom in terms that included – but was not limited to – legal manumission. Her transatlantic biography offers a rare insight into the life of a free black woman (and former slave) in late sixteenth-century Puebla, who sought to establish various degrees of freedom for herself. Whether she was refusing to acquiesce to an abusive owner, embracing entrepreneurship, marrying, purchasing her own slave property, or later using the courts to petition for divorce. Sossa continued to advocate on her own behalf. Her biography shows that obtaining legal manumission was not always equivalent to independence and autonomy, particularly if married to an abusive husband, or if financial successes inspired the envy of neighbors