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Search Results: 1 - 10 of 624292 matches for " MáTYáS "
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Migratory, Genetic and Phenetic Response Potential of Forest Tree Populations Facing Climate Change
MáTYáS, Csaba
Acta Silvatica & Lignaria Hungarica , 2006,
Abstract: Forest trees are especially vulnerable to climatic oscillations due to their long lifespan. Outof the possible mechanisms of acclimation and adaptation, natural selection and migration will play asubordinate role because of the relatively high speed of expected changes. Phenotypic plasticity retainson the other hand primary importance. Analysis of common garden experiments and of healthmonitoring data indicate that response across the distribution area will be differentiated. The lowlatitude,low elevation periphery is especially threatened, while growth in the northern part of rangeswill accelerate (in case moisture conditions will remain favourable). Comparing the velocity ofpredicted changes and the constraints of the buffering mechanisms of species for adaptation, it isobvious that human interference will be essential for the maintenance of ecosystem stability. Forestgenetic and ecology research results have to be synthesised to better elucidate the requirements ofstability and response of forest ecosystems under predicted climatic conditions.
The Application of Joint Inversion in Geophysical Exploration  [PDF]
ákos Gyulai, Mátyás Krisztián Baracza, éva Eszter Tolnai
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.42026

The paper presents a short overview about the application of joint inversion in geophysics. It gives also an alternative explanation for the term of different data sets and discusses what types of inversion procedures can be considered as joint inversion. Nowadays there are no standard standpoints using the appellation joint inversion. What is joint inversion? Based on the information matrix an answer could be given for this question what could be regarded as various types of data sets that are inverted simultaneously. We would like to expand the explanationthat is professed by many researchersof the method that regards only the simultaneous inversion of data sets based on different physical parameters as joint inversion.

Geometrical origin of chaoticity in the bouncing ball billiard
L. Mátyás,I. F. Barna
Physics , 2010, DOI: 10.1016/j.chaos.2011.10.002
Abstract: We present a study of the chaotic behavior of the bouncing ball billiard. The work is realised on the purpose of finding at least certain causes of separation of the neighbouring trajectories. Having in view the geometrical construction of the system, we report a clear origin of chaoticity of the bouncing ball billiard. By this we claim that in case when the floor is made of arc of circles - in a certain interval of frequencies - a lower bound for the maximal Ljapunov can be evaluated by sem-ianalitical techniques.
Pulsed Electrochemical Deposited Nano-Iron for Water Treatment  [PDF]
éva Fazakas, Mátyás-Karácsony Zsuzsanna, Richárd Bak, Lajos K. Varga
American Journal of Analytical Chemistry (AJAC) , 2017, DOI: 10.4236/ajac.2017.83014
Abstract: The application of nanotechnology in drinking water treatment and pollution cleanup is promising, as demonstrated by a number of field-based (pilot and full scale) and bench scale studies. In recent years, the use of zero-valent iron (ZVI) for the treatment of toxic contaminants in groundwater and wastewater has received wide attention and encouraging treatment efficiencies have been documented. In this review, nanoscale iron was prepared by pulse electrodeposition of nano iron by chemical reduction of iron chloride and iron sulfate. Our research focuses on iron nanoparticles preparation and its use for aqueous Cr(VI) reduction. The Cr(VI) reduction by the nFe0 prepared by electrochemical and blasting method at neutral pH were carried. The results show that blasting-nFe0 show lower reaction than the electrochemical-nFe0. It is because the blasting-nFe0 surface contains more Fe2O3 than the other one.
Charged black holes: Wave equations for gravitational and electromagnetic perturbations
Zoltán Perjés,Mátyás Vasúth
Physics , 2002, DOI: 10.1086/344572
Abstract: A pair of wave equations for the electromagnetic and gravitational perturbations of the charged Kerr black hole are derived. The perturbed Einstein-Maxwell equations in a new gauge are employed in the derivation. The wave equations refer to the perturbed Maxwell spinor $\Phi_0$ and to the shear $\sigma$ of a principal null direction of the Weyl curvature. The whole construction rests on the tripod of three distinct derivatives of the first curvature $\kappa$ of a principal null direction.
Forests at the limit: evolutionary – genetic consequences of environmental changes at the receding (xeric) edge of distribution. Report from a researcher workshop
MáTYáS, Csaba,FADY, Bruno,VENDRAMIN, Giovanni G.
Acta Silvatica & Lignaria Hungarica , 2009,
Effects of Simulated Forest Cover Change on Projected Climate Change – a Case Study of Hungary
GáLOS, Borbála,JACOB, Daniela,MáTYáS, Csaba
Acta Silvatica & Lignaria Hungarica , 2011,
Abstract: Climatic effects of forest cover change have been investigated for Hungary applying theregional climate model REMO. For the end of the 21st century (2071–2100) case studies have beenanalyzed assuming maximal afforestation (forests covering all vegetated area) and completedeforestation (forests replaced by grasslands) of the country. For 2021–2025, the climatic influence ofthe potential afforestation based on a detailed national survey has been assessed. The simulationresults indicate that maximal afforestation may reduce the projected climate change through coolerand moister conditions for the entire summer period. The magnitude of the simulated climate changemitigating effect of the forest cover increase differs among regions. The smallest climatic benefit wascalculated in the southwestern region, in the area with the potentially strongest climate change. Thestrongest effects of maximal afforestation are expected in the northeastern part of the country. Here,half of the projected precipitation decrease could be relieved and the probability of summer droughtscould be reduced. The potential afforestation has a very slight feedback on the regional climatecompared to the maximal afforestation scenario.
Gravitational waveforms from a Lense-Thirring system
János Majár,Mátyás Vasúth
Physics , 2006, DOI: 10.1103/PhysRevD.74.124007
Abstract: The construction of ready to use templates for gravitational waves from spinning binaries is an important challenge in the investigation of detectable gravitational wave signals. Here we present a method to evaluate the gravitational wave polarization states for inspiralling compact binaries in the extreme mass ratio limit. We discuss the effects caused by the rotation of the central massive object for eccentric orbits in the Lense-Thirring approximation and give the formal expressions of the polarization states including higher order corrections. Our results are in agreement with existing calculations for the spinless and circular orbit limits.
Gravitational waveforms for finite mass binaries
Mátyás Vasúth,János Majár
Physics , 2007, DOI: 10.1142/S0217751X07036488
Abstract: One of the promising sources of gravitational radiation is a binary system composed of compact stars. It is an important question how the rotation of the bodies and the eccentricity of the orbit affect the detectable signal. Here we present a method to evaluate the gravitational wave polarization states for inspiralling compact binaries with comparable mass. We consider eccentric orbits and the spin-orbit contribution in the case of one spinning object up to 1.5 post-Newtonian order. For circular orbits our results are in agreement with existing calculations.
Modeling bound-to-continuum terahertz quantum cascade lasers: The role of Coulomb interactions
Christian Jirauschek,Alpár Mátyás,Paolo Lugli
Physics , 2011, DOI: 10.1063/1.3276160
Abstract: Based on an ensemble Monte Carlo analysis, we show that Coulomb interactions play a dominant role in bound-to-continuum terahertz quantum cascade lasers and thus require careful modeling. Coulomb interactions enter our simulation in the form of space charge effects as well as Coulomb scattering events. By comparison to a full many-subband Coulomb screening model, we show that simplified approaches produce considerable deviations for such structures. Also the spin dependence of electron-electron scattering has to be adequately considered. Moreover, we demonstrate that iterative Schr\"{o}dinger-Poisson and carrier transport simulations are necessary to correctly account for space charge effects.
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