Search results for "Stability"

THE STABILITY, RISK AND PERFORMANCE OF COOPERATIVE BANKS

2013

In a market economy, tradition, stability and performance of cooperative banks, namely science and art of leadership, management, organization and their administration become major facets in promoting and improving cooperative banks, at the microeconomic level, to which we provide a coherent set of concepts, principles, methods and management techniques, their knowledge contributing to the viability and practical implementation, modernization and development of cooperative banks to increase their profitability and competitiveness in heightened risk conditions on local, national and even global markets. In the context of major changes in Romanian society, the action of the forces inside the …

The Lorenz system : hidden boundary of practical stability and the Lyapunov dimension

2020

On the example of the famous Lorenz system, the difficulties and opportunities of reliable numerical analysis of chaotic dynamical systems are discussed in this article. For the Lorenz system, the boundaries of global stability are estimated and the difficulties of numerically studying the birth of self-excited and hidden attractors, caused by the loss of global stability, are discussed. The problem of reliable numerical computation of the finite-time Lyapunov dimension along the trajectories over large time intervals is discussed. Estimating the Lyapunov dimension of attractors via the Pyragas time-delayed feedback control technique and the Leonov method is demonstrated. Taking into accoun…

Analysis of stability against falling by movement simulation in human walking

2014

Rapid self-healing and anion selectivity in metallosupramolecular gels assisted by fluorine-fluorine interactions.

2017

Simple ML2 [M = Fe(II), Co(II), Ni(II)] complexes obtained from a perfluoroalkylamide derivative of 4-aminophenyl-2,2′,6,2′-terpyridine spontaneously, yet anion selectively, self-assemble into gels, which manifest an unprecedented rapid gel strength recovery, viz. self-healing, and thermal rearrangement in aqueous dimethyl sulfoxide. The key factor for gelation and rheological properties emerges from the fluorine–fluorine interactions between the perfluorinated chains, as the corresponding hydrocarbon derivative did not form metallogels. The perfluoro-terpyridine ligand alone formed single crystals, while its Fe(II), Co(II) or Ni(II) complexes underwent rapid gelation leading to highly enta…

Analytical approach for the problems of dynamics and stability of a moving web

2015

Problems of dynamics and stability of a moving web, modelled as an elastic rod or string, and axially travelling between rollers (supports) at a constant velocity, are studied using analytical approaches. Transverse, longitudinal and torsional vibrations of the moving web are described by a hyperbolic second-order partial differential equation, corresponding to the string and rod models. It is shown that in the framework of a quasi-static eigenvalue analysis, for these models, the critical point cannot be unstable. The critical velocities of one-dimensional webs, and the arising non-trivial solution of free vibrations, are studied analytically. The dynamical analysis is then extended into t…

After essentially contested concepts

2012

Tutkielmassani tarkastelen W.B. Gallien teoriaa essentiaalisesti kiistettävistä käsitteistä. Gallien vuonna 1956 julkaiseman merkittävän artikkelin ”Essentially Contested Concepts” jälkeen teoria essentiaalisesti kiistettävistä käsitteistä on saanut osakseen laajaa huomiota keskenään hyvinkin erilaisista lähtökohdista asiaa lähestyviltä teoreetikoilta. Gallien alkuperäisen teorian tosiasiallista sovellutusalaa ja tarkoitusta koskevien kiistojen lisäksi jotkut kommentoijista ovat pyrkineet muuttamaan ja uudistamaan ko. teoriaa, jotta Gallien alkuperäinen oivallus pystyttäisiin turvaamaan, siinä missä toiset tutkijat ovat tyrmänneet koko projektin lähtökohdiltaan jo vääräksi. Näiden kontribuu…

Effects of the foot evolution on the behaviour of slow-moving landslides

2011

The paper presents a time-dependent 2D numerical model which has been developed with the purpose of highlighting the effects of the slope foot evolution on the behaviour of slow-moving landslides. The model allows to quantitatively analyse how foot mass variations can influence the stability and the movement rates of the landslide. The landslide body is modelled as composed of two rigid blocks sliding on two different planes and interacting through a common boundary, which position is assumed fixed during the analysis. A finite difference approach is used to discretize the time. For each time increment, changes in model parameters are allowed, including variations in shearing resistances, g…

Ground instability in the old town of Agrigento (Italy) depicted by on-site investigations and Persistent Scatterers data

2012

We combine on-site investigations with the interpretation of satellite Persistent Scatterers (PS) to analyse ground instability in the historic town of Agrigento, Italy. Geological and geomorphologic surveys, together with geostructural and kinematic analyses, depict the deformational patterns of the northwestern sector of the town, previously documented by extensive literature available for the neighbouring Valley of the Temples. The geological and geomorphologic maps are reconstructed by combining bibliographic studies, field surveys and aerial stereo-interpretation. ERS-1/2 PS data reveal deformation velocities up to 18–20 mm yr<sup>−1</sup> in 1992–2000 over the Addolorata l…

Analysis of the energy balance closure over a FLUXNET boreal forest in Finland

2010

Abstract. The imbalance in the surface energy budget, when using eddy-covariance techniques to measure turbulent fluxes, is still an unresolved problem. Important progresses have been reported in recent years identifying potential reasons for this lack of energy balance closure. In this paper we focus on the data collected in a FLUXNET boreal forest site in Sodankylä, Finland. Using one month half-hourly data, an average Energy Balance Ratio (EBR) of 0.72 is obtained. The inclusion of the heat storage terms in the energy budget yields an improvement of about 6% in the total closure. The sensitivity of the energy balance closure to the turbulence intensity is analysed in terms of the frictio…

Advanced radar-interpretation of InSAR time series for mapping and characterization of geological processes

2011

Abstract. We present a new post-processing methodology for the analysis of InSAR (Synthetic Aperture Radar Interferometry) multi-temporal measures, based on the temporal under-sampling of displacement time series, the identification of potential changes occurring during the monitoring period and, eventually, the classification of different deformation behaviours. The potentials of this approach for the analysis of geological processes were tested on the case study of Naro (Italy), specifically selected due to its geological setting and related ground instability of unknown causes that occurred in February 2005. The time series analysis of past (ERS1/2 descending data; 1992–2000) and current…