Search results for "Instability"
showing 10 items of 724 documents
The interplay of emotional instability, empathy, and coping on prosocial and aggressive behaviors
2012
Abstract Mediating and moderating effects of socioemotive traits and coping styles on aggression and prosocial behaviors were examined. A sample of 1557 students from Spain (53% male, M age = 13.12) completed self-report instruments of coping, empathy, emotional instability, physical aggression, and prosocial behaviors. Structural equation analysis showed support for two mediation models but little support for moderation. Emotional instability positively predicted emotion-focused coping, which in turn, positively predicted aggression. In contrast, empathy positively predicted problem-focused coping, which in turn, positively predicted prosocial behaviors. Moreover, problem-focused coping po…
Emociones, estilos de afrontamiento y agresividad en la adolescencia
2012
Este estudio analiza la relación entre las estrategias de afrontamiento y las emociones para determinar en qué medida son procesos relacionados con la conducta agresiva. Se parte del supuesto de que en la agresividad influyen los mecanismos de afrontamiento en la resolución de problemas y el manejo de las emociones: inestabilidad emocional (falta de autocontrol ante situaciones que producen tensión) o empatía (sentimientos orientados al otro que tiene un problema o necesidad). Se ha evaluado una muestra de 1.557 niños y niñas, con un rango de edad entre 12 y 15 años, escolarizados en primer ciclo de Educación Secundaria Obligatoria (ESO) en 36 Centros escolares de la Comunidad Valenciana, s…
Vínculos familiares e inclusión social. Variables predictoras de la conducta prosocial en la infancia
2018
The purpose of this study was to investigate the relationship between prosocial behavior and family environment variables (attachment to the mother and father and abandonment by the mother and father), personal variables (emotional instability, aggression, and coping strategies), and variables that relate to the immediate social environment (peer acceptance and rejection). This study also examined the predictors of prosocial behavior. Prosocial behavior is a personal protective factor that encourages positive relationships between peers and promotes personal and social adjustment behaviors (Mikolajewski, Chavarria, Moltisanti, Hart & Taylor, 2014). A study with a sample of 1,447 chi…
The transient gravitational-wave sky
2013
Interferometric detectors will very soon give us an unprecedented view of the gravitational-wave sky, and in particular of the explosive and transient Universe. Now is the time to challenge our theoretical understanding of short-duration gravitational-wave signatures from cataclysmic events, their connection to more traditional electromagnetic and particle astrophysics, and the data analysis techniques that will make the observations a reality. This paper summarizes the state of the art, future science opportunities, and current challenges in understanding gravitational-wave transients.
Orbital instabilities and spin-symmetry breaking in coupled-cluster calculations of indirect nuclear spin–spin coupling constants
2009
Abstract The effect of orbital instabilities is investigated for spin-symmetry breaking perturbations, namely the Fermi-contact (FC) and spin–dipole (SD) contributions to the indirect nuclear spin–spin coupling constants. For the CO and N 2 molecules the FC and SD contributions have been calculated and orbital-stability analyses for various interatomic distances have been carried out. This includes calculations at the Hartree–Fock self-consistent field (HF-SCF), coupled-cluster (CC) singles and doubles (CCSD), CC3, CCSD(T), CCSDT-4, CC singles, doubles, and triples (CCSDT) levels, and for the first time also at the CC singles, doubles, triples, and quadruples (CCSDTQ) level of theory. For c…
Influence of spatial delay on the modulational instability in a composite system with a controllable nonlinearity.
2017
A theoretical investigation of the modulational instability (MI) in a composite system with a nonlocal response function is presented. A composite system of silver nanoparticles in acetone is chosen, whose nonlinearity can be delicately varied by controlling the volume fraction of the constituents, thus enabling the possibility of nonlinearity management. A pump-probe counterpropagation configuration has been assumed, and the interplay between the competing nonlinearities and the nonlocalities in the MI dynamics is systematically explored. A different class of nonlocalities have been considered, and the study reveals that the nonlocality critically depends on the kind of nonlocal function. …
The electron gas with a strong pairing interaction: Three particle correlations and the Thouless instability
2000
We derive simplified Faddeev type equations for the three particle T-matrix which are valid in the Hubbard model where only electrons with opposite spins interact. Using the approximation of dynamical mean field theory these equations are partially solved numerically for the attractive Hubbard model. It is shown that the three particle T-matrix contains a term vanishing $\sim T^2$ at the Thouless (or BCS) instability where the two-particle T-matrix diverges. Based on the three particle term we further derive the low density - strong coupling extension for the two-particle vertex function. We therefore understand our equations as a step towards a systematic low density expansion from the wea…
Le due crisi: crisi del capitalismo e crisi ambientale. Una soluzione sostenibile?
2015
Le due crisi in titolo sono due facce di una stessa medaglia; e il tema verrà trattato su questa rivista in due parti divise solo al fine di agevolare la lettura. Nella Parte I si evidenzia come la crisi ambientale derivi dal generale rapporto di predazione e spoliazione delle risorse naturali, caratteristico del modo capitalistico di produzione e consumo; ancor più devastante nella sua attuale fase “iperliberista”. I danni sociali della crisi economica sono drammaticamente evidenti alla maggior parte dell’opinione pubblica – la critica alle attuali teorie e modelli economici sarà oggetto della Parte II – mentre le altrettanto drammatiche conseguenze della crisi ambientale faticano a diveni…
Cross-diffusion effects on stationary pattern formation in the FitzHugh-Nagumo model
2022
<p style='text-indent:20px;'>We investigate the formation of stationary patterns in the FitzHugh-Nagumo reaction-diffusion system with linear cross-diffusion terms. We focus our analysis on the effects of cross-diffusion on the Turing mechanism. Linear stability analysis indicates that positive values of the inhibitor cross-diffusion enlarge the region in the parameter space where a Turing instability is excited. A sufficiently large cross-diffusion coefficient of the inhibitor removes the requirement imposed by the classical Turing mechanism that the inhibitor must diffuse faster than the activator. In an extended region of the parameter space a new phenomenon occurs, namely the exis…
Observation of instability of faceted crystals in lipid monolayers
1998
Abstract The morphological instabilities of two-dimensional hexagonal crystals in lipid monolayers are studied. Fluorescence microscopy indicates that beyond a critical size the faceted crystal develops into dendrites with unusual tip growth behavior, which is not consistent with the current theory of dendritic growth. The morphological transitions in relation to the driving force for two-dimensional crystal growth are also studied.