Home  About us  Contact
 

Global Dynamics (global + dynamics)

Distribution by Scientific Domains
Physics and Astronomy40%
Humanities and Social Sciences40%

Selected Abstracts

Theological Ethics and Global Dynamics in the Time of Many Worlds.

THE HEYTHROP JOURNAL, Issue 1 2007
By William Schweiker
No abstract is available for this article. [source]

Complex dynamics in one-dimensional CNNs

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 1 2006
István Petrás
Abstract The effect of boundary conditions on the global dynamics of cellular neural networks (CNNs) is investigated. As a case study one-dimensional template CNNs are considered. It is shown that if the off-diagonal template elements have opposite sign, then the boundary conditions behave as bifurcation parameters and can give rise to a very rich and complex dynamic behaviour. In particular, they determine the equilibrium point patterns, the transition from stability to instability and the occurrence of several bifurcation phenomena leading to strange and/or chaotic attractors and to the coexistence of several attractors. Then the influence of the number of cells on the global dynamics is studied, with particular reference to the occurrence of hyperchaotic behaviour. Copyright © 2006 John Wiley & Sons, Ltd. [source]

The resonant structure of Jupiter's Trojan asteroids , I. Long-term stability and diffusion

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 4 2006
P. Robutel
ABSTRACT We study the global dynamics of the jovian Trojan asteroids by means of the frequency map analysis. We find and classify the main resonant structures that serve as skeleton of the phase space near the Lagrangian points. These resonances organize and control the long-term dynamics of the Trojans. Besides the secondary and secular resonances, that have already been found in other asteroid sets in mean motion resonance (e.g. main belt, Kuiper belt), we identify a new type of resonance that involves secular frequencies and the frequency of the great inequality, but not the libration frequency. Moreover, this new family of resonances plays an important role in the slow transport mechanism that drives Trojans from the inner stable region to eventual ejections. Finally, we relate this global view of the dynamics with the observed Trojans, identify the asteroids that are close to these resonances and study their long-term behaviour. [source]

The kinetic power of jets magnetically accelerated from advection-dominated accretion flows in radio galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: LETTERS (ELECTRONIC), Issue 1 2010
Shuang-Liang Li
ABSTRACT There is a significant non-linear correlation between the Eddington ratio (Lbol/LEdd) and the Eddington-scaled kinetic power (Lkin/LEdd) of jets in low luminosity active galactic nuclei (AGNs). It is believed that these low luminosity AGNs contain advection-dominated accretion flows (ADAFs). We adopt the ADAF model developed by Li & Cao, in which the global dynamics of ADAFs with magnetically driven outflows is derived numerically, to explore the relation between the bolometric luminosity and the kinetic power of jets. We find that the observed relation, , can be well reproduced by the model calculations with reasonable parameters for ADAFs with magnetically driven outflows. Our model calculations are always consistent with the slope of the correlation independent of the values of the parameters adopted. Compared with the observations, our results show that over 60 per cent of the accreted gas at the outer radius escapes from the accretion disc in a wind before the gas falls into the black holes. The observed correlation between the Eddington-scaled kinetic power and Bondi power can also be qualitatively reproduced by our model calculations. Our results show that the mechanical efficiency varies from 10,2 to10,3, which is roughly consistent with that required in AGN feedback simulations. [source]

Milk Teeth and Jet Planes: Kin Relations in Families of Sri Lanka's Transnational Domestic Servants

CITY & SOCIETY, Issue 1 2008
MICHELE R. GAMBURD
Abstract This essay examines the confluence of local and global dynamics, exploring how transnational migration affects and is affected by gender roles, kinship relations, intergenerational obligations, and ideologies of parenthood. Journeying to the Middle East repeated on two-year labor contracts, many of Sri Lanka's migrant housemaids leave behind their husbands and children. Women's long-term absences reorganize and disrupt widely accepted gendered attributions of parenting roles, with fathers and female relatives taking over household tasks. Migrants say that economic difficulties prompt migration, and assess commitment to kin in financial terms. The government also benefits from remittances. Nevertheless, stakeholders (villagers, politicians, and the national media) worry about the social costs born by children. Drawing on interviews with the adult children of migrant mothers in four extended families in the Sri Lankan coastal village of Naeaegama, I examine the long-term effects of transnational labor migration on local households. The case studies do not support media claims that children suffer abuse and neglect in their mothers' absence, but do in part support survey information on reduced education, shifting marriage patterns, and paternal alcohol consumption. [source]