Search results for "CONSERVATION"

Magnetic fields in heavy ion collisions: flow and charge transport

2020

At the earliest times after a heavy-ion collision, the magnetic field created by the spectator nucleons will generate an extremely strong, albeit rapidly decreasing in time, magnetic field. The impact of this magnetic field may have detectable consequences, and is believed to drive anomalous transport effects like the Chiral Magnetic Effect (CME). We detail an exploratory study on the effects of a dynamical magnetic field on the hydrodynamic medium created in the collisions of two ultrarelativistic heavy-ions, using the framework of numerical ideal MagnetoHydroDynamics (MHD) with the ECHO-QGP code. In this study, we consider a magnetic field captured in a conducting medium, where the conduc…

Effect of Demand Side Management on the Operation of PV-Integrated Distribution Systems

2020

In this new era of high electrical energy dependency, electrical energy must be abundant and reliable, thus smart grids are conducted to deliver load demands. Hence, smart grids are implemented alongside distributed generation of renewable energies to increase the reliability and controllability of the grid, but, with the very volatile nature of the Distributed Generation (DG), Demand Side Management (DSM) helps monitor and control the load shape of the consumed power. The interaction of DSM with the grid provides a wide range of mutual benefits to the user, the utility and the market. DSM methodologies such as Conservation Voltage Reduction (CVR) and Direct Load Control (DLC) collaborate i…

A multi-domain approach for smoothed particle hydrodynamics simulations of highly complex flows

2018

Abstract An efficient and accurate method is proposed to solve the incompressible flow momentum and continuity equations in computational domains partitioned into subdomains in the framework of the smoothed particle hydrodynamics method. The procedure does not require any overlap of the subdomains, which would result in the increase of the computational effort. Perfectly matching solutions are obtained at the surfaces separating neighboring blocks. The block interfaces can be both planar and curved surfaces allowing to easily decompose even geometrically complex domains. The smoothing length of the kernel function is maintained constant in each subdomain, while changing between blocks where…

Modelling urban networks sustainable progress

2019

In this paper, we analyse the relations between thermodynamics and city networks: an increase in the complexity and the organized information in such urban systems leads to less demand for resources and less social entropy, which overall makes them more efficient and stable. The goal of this study is to propose a method to measuring city networks sustainable progress based on statistical models, derived from Eurostat databases and NASA satellite images, and capable of analyzing different conceptual scenarios of urban development in Europe. The obtained probability-based indices enable us to evaluate the dynamics of city networks in terms of three components of sustainable progress – economi…

On the correction of conserved variables for numerical RMHD with staggered constrained transport

2015

Despite the success of the combination of conservative schemes and staggered constrained transport algorithms in the last fifteen years, the accurate description of highly magnetized, relativistic flows with strong shocks represents still a challenge in numerical RMHD. The present paper focusses in the accuracy and robustness of several correction algorithms for the conserved variables, which has become a crucial ingredient in the numerical simulation of problems where the magnetic pressure dominates over the thermal pressure by more than two orders of magnitude. Two versions of non-relativistic and fully relativistic corrections have been tested and compared using a magnetized cylindrical …

La patrimonialización de la naturaleza. Génesis, transformaciones y estado actual

2014

En este artículo realizamos una aproximación general a la sociogénesis de la conservación moderna y pública de la naturaleza. Para ello distinguimos tres etapas . La primera estar á marca da por la búsqueda del anhelado paraíso perdido: a finales del siglo XIX y principios del XX, el paisaje concentrará valores identitarios, patrióticos y nacionalistas . La segunda se caracteriza por la expansión de las áreas protegidas y la multiplicación de instituciones, agentes y figuras proteccionistas en el contexto de una crisis ambienta l creciente. Y la tercera, desplegada en las dos últimas décadas, viene definida por la entrada de un nuevo modelo de conservación participativa a la vez que se prod…

Gestión y liderazgo del talento: las claves del éxito empresarial

2021

Desde hace ya unas décadas, se está trabajando con profundidad en la investigación científica sobre la evidencia en las empresas de la gestión del talento. A nivel profesional, ya han sido muchas organizaciones las que han dado el salto cualitativo hacia una nueva manera de enfocar los recursos humanos (RR. HH.). Principalmente porque esta nueva perspectiva está más vinculada tanto al negocio como a los objetivos empresariales, además de ser más aceptada por la mayoría de los profesionales. Desde los orígenes de la guerra del talento por Mckinsey hasta la actualidad, la investigación está analizando el papel de la gestión del talento en los resultados organizativos. En este sentido, Luna (2…

Results of efforts made for in situ and ex situ conservation of Abies nebrodensis (Pinaceae) in Sicily

2013

Species richness and abundance of butterflies in natural and drained mires in Finland

2012

[Introduction] Approximately half of Finnish peatlands have been drained for forestry. However, there is considerable variation regionally, and in particular in southern southern half of Finland ca 80-90 % of the original mire area has been ditched. Drainage was most intensive in 1960s and 1970s, but ditching has gradually decreased since that. Drainage has extensive effects on flora and fauna of mire habitats (Laine & al. 1995b, Aapala & Lappalainen 1998a, Aapala & Lappalainen 1998b, Vasander 1998, Heikkilä & al. 2002). Restoration of drained mires has began relatively recently and the research based knowledge of the ecological effects of the restoration are still forthcoming. Nevertheless…

Community Turnover of Wood-Inhabiting Fungi across Hierarchical Spatial Scales

2014

For efficient use of conservation resources it is important to determine how species diversity changes across spatial scales. In many poorly known species groups little is known about at which spatial scales the conservation efforts should be focused. Here we examined how the community turnover of wood-inhabiting fungi is realised at three hierarchical levels, and how much of community variation is explained by variation in resource composition and spatial proximity. The hierarchical study design consisted of management type (fixed factor), forest site (random factor, nested within management type) and study plots (randomly placed plots within each study site). To examine how species richne…