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  • Artikel  (1.329)
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  • Springer  (1.329)
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  • 2015-2019  (1.221)
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  • 1
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    Climate change vulnerability to agrarian ecosystem of small Island: evidence from Sagar Island, India (2017)
    Springer
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    Publikationsdatum: 2017-03-19
    Beschreibung: The present study assessed climate change vulnerability in agricultural sector of low-lying Sagar Island of Bay of Bengal. Vulnerability indices were estimated using spatially aggregated biophysical and socio-economic parameters by applying principal component analysis and equal weight method. The similarities and differences of outputs of these two methods were analysed across the island. From the integration of outputs and based on the severity of vulnerability, explicit vulnerable zones were demarcated spatially. Results revealed that life subsistence agriculture in 11.8% geographical area (2829 ha) of the island along the western coast falls under very high vulnerable zone (VHVZ VI of 84–99%) to climate change. Comparatively higher values of exposure (0.53 ± 0.26) and sensitivity (0.78 ± 0.14) subindices affirmed that the VHV zone is highly exposed to climate stressor with very low adaptive capacity (ADI= 0.24 ± 0.16) to combat vulnerability to climate change. Hence, food security for a population of 〉22 thousands comprising 〉3.7 thousand agrarian households are highly exposed to climate change. Another 17% area comprising 17.5% population covering 20% villages in north-western and eastern parts of the island also falls under high vulnerable (VI= 61%–77%) zone. Findings revealed large spatial heterogeneity in the degree of vulnerability across the island and thus, demands devising area specific planning (adaptation and mitigation strategies) to address the climate change impact implications both at macro and micro levels.
    Print ISSN: 0177-798X
    Digitale ISSN: 1434-4483
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Springer
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  • 2
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    Viscous dissipation in 2D fluid dynamics as a symplectic process and its metriplectic representation (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . Dissipation can be represented in Hamiltonian mechanics in an extended phase space as a symplectic process. The method uses an auxiliary variable which represents the excitation of unresolved dynamics and a Hamiltonian for the interaction between the resolved dynamics and the auxiliary variable. This method is applied to viscous dissipation (including hyper-viscosity) in a two-dimensional fluid, for which the dynamics is non-canonical. We derive a metriplectic representation and suggest a measure for the entropy of the system.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 3
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    Is there a resting frame in the universe? A proposed experimental test based on a precise measurement of particle mass (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . According to the Special Theory of Relativity, there should be no resting frame in our universe. Such an assumption, however, could be in conflict with the Standard Model of cosmology today, which regards the vacuum not as an empty space. Thus, there is a strong need to experimentally test whether there is a resting frame in our universe or not. We propose that this can be done by precisely measuring the masses of two charged particles moving in opposite directions. If all inertial frames are equivalent, there should be no detectable mass difference between these two particles. If there is a resting frame in the universe, one will observe a mass difference that is dependent on the orientation of the laboratory frame. The detailed experimental setup is discussed in this paper.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 4
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    Scattering of position-dependent mass Schrödinger equation with delta potential (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . The scattering of the position-dependent mass Schrödinger equation due to both single Dirac delta and double Dirac delta potentials has been investigated. We have obtained the reflection as well as transmission coefficients and current density for both potentials. Moreover, we have studied the Ramsauer-Townsend effect with the position-dependent mass in quantum mechanics.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 5
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    Dynamics of solitons to the ill-posed Boussinesq equation (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . In this paper, we analyze the dynamic behavior of the ill-posed Boussinesq equation (IPBE) that arises in nonlinear lattices and also in shallow water waves. Some solitary wave solutions are obtained by using the solitary wave ansatz method and the Bernoulli sub-Ode. By applying the technique of nonlinear self-adjoint, a quasi self-adjoint substitution for the IPBE is constructed. The classical symmetries of the equation are constructed. Then, we used along with the obtained nonlinear self-adjoint substitution to construct a set of new conservation laws (Cls).
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 6
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    Quantum tunneling from the charged non-rotating BTZ black hole with GUP (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . In the present paper, the quantum corrections to the temperature, entropy and specific heat capacity of the charged non-rotating BTZ black hole are studied by the generalized uncertainty principle in the tunneling formalism. It is shown that quantum corrected entropy would be of the form of predicted entropy in quantum gravity theories like string theory and loop quantum gravity.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 7
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    A semiclassical extended electron model (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . The self-energy of a given charge distribution is the energy required to assemble the distribution by bringing in the constituent charges from infinity. Particularly, for a pointlike distribution ( e.g. , a classical electron) the self-energy is infinity. Thus a modification of the Coulomb potential is required in order to have a finite value for this energy. Here we present a model for a charged particle consisting of a potential well together with a combination of Coulomb and Yukawa-like potentials. This leads us to finding an approximate value attributed to its self-energy. We subsequently discuss the non-relativistic electron-electron scattering problem.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 8
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    Construction of the energy matrix for complex atoms (2017)
    Springer
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    Publikationsdatum: 2017-03-21
    Beschreibung: . We report the fine structure analysis of the even configurations system of atomic terbium in the complete set of \( 4{\rm f}^{N}\) -core states. For the purpose of the huge matrix diagonalization, we propose the methods utilizing the personal computer clusters and, alternatively, the Microsoft Azure cloud computing. The implementation of these approaches is presented.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 9
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    Application of the Legendre wavelets method to the parallel plate flow of a third grade fluid and forced convection in a porous duct (2017)
    Springer
    Details
    Publikationsdatum: 2017-03-21
    Beschreibung: . A method based on Legendre wavelets is presented in this paper to discuss the flow of a third grade fluid between parallel plates and the forced convection in a porous duct. The flow problems are modeled in terms of integral equations which are then solved by the Legendre wavelets method. The comparison between present results and the existing solutions shows that the Legendre wavelets method is a powerful tool for solving nonlinear boundary value problems. We hope this method can be used for solving many interesting problems arising in non-Newtonian fluids.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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  • 10
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    Numerical investigation of the heat transfer of a ferrofluid inside a tube in the presence of a non-uniform magnetic field (2017)
    Springer
    Details
    Publikationsdatum: 2017-02-10
    Beschreibung: . In this article, a three-dimensional numerical investigation is performed to study the effect of a magnetic field on a ferrofluid inside a tube. This study comprehensively analyzes the influence of a non-uniform magnetic field in the heat transfer of a tube while a ferrofluid (water with 0.86 vol% nanoparticles (Fe 3 O 4 ) is let flow. The SIMPLEC algorithm is used for obtaining the flow and heat transfer inside the tube. The influence of various parameters, such as concentration of nanoparticles, intensity of the magnetic field, wire distance and Reynolds number, on the heat transfer is investigated. According to the obtained results, the presence of a non-uniform magnetic field significantly increases the Nusselt number (more than 300%) inside the tube. Also, the magnetic field induced by the parallel wire affects the average velocity of the ferrofluid and forms two strong eddies in the tube. Our findings show that the diffusion also raises as the concentration of the nanoparticle is increased.
    Digitale ISSN: 2190-5444
    Thema: Physik
    Publiziert von Springer
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