Search results for "function"

Sosiaalisen elämän kehykset : kampus-ohjelman opiskelijoiden sosiaalinen asema tuetussa aikuisopiskelussa ja vapaa-ajalla

2012

Time-dependent quantum transport in nanosystems : a nonequilibrium Green's function approach

2016

A time-dependent extension to the Landauer–Büttiker approach to study transient quantum transport in arbitrary junctions composed of leads and conducting devices is developed. The nonequilibrium Green’s function approach is employed for describing the charge and heat transport dynamics. The importance of the developed method is that it provides a closed formula for the time-dependent density matrix in both electronic and phononic systems. In the electronic case the nonequilibrium conditions are due to a switch-on of a bias voltage in the leads or a perturbation in the junction whereas in the phononic case the central region of interest is coupled to reservoirs of di erent temperatures. In b…

Scattering of Co-Current Surface Waves on an Analogue Black Hole

2018

We report on what is to our knowledge the first scattering experiment of surface waves on an accelerating transcritical flow, which in the analogue gravity context is described by an effective spacetime with a black-hole horizon. This spacetime has been probed by an incident co-current wave, which partially scatters into an outgoing countercurrent wave on each side of the horizon. The measured scattering amplitudes are compatible with the predictions of the hydrodynamical theory, where the kinematical description in terms of the effective metric is exact.

Circular economy and agritourism: a sustainable behavioral model for tourists and farmers in the post-COVID era.

2023

Introduction: In recent years, issues related to environmental and ecosystem protection have been given greater consideration than in the past. The goal of adopting sustainable development models is vigorously pursued in the European Union and is reflected concretely in the new Common Agricultural Policy 20232027. The circular economy can certainly be an emerging economic response that can eectively replace growth models centered on a linear view. Agriculture and tourism are two crucial sectors where the “green transition” should be encouraged to help achieve sustainability goals through economic circularity. Agritourism’s activity may be relevant in contributing to a behavioral change based…

Development and changes in the industrial function of a city with reference to the conception of sustainable development (a study case of Opole)

2015

The principal goal of the paper is to identify the influence of the industrial sphere on the development of and changes in a city, according to rules of sustainable development. The first part of the article is devoted to industrial objects and area which have existed for about 20 years and are characterized by huge changes. It is important to answer the questions: how changes in the case of an obsolete industrial area are related to social and environmental spheres, and what should be done in the case of a negative influence of the industrial sphere on the other two. Furthermore, it is important to identify the performance and actions which are taken by the local government in this context…

Agri-food Clusters as an Opportunity for Development of Border Rural Areas

2016

Cooperation within the framework of euroregions of the European Union is an answer to challenges posed by global economy and not merely an instrument to reduce negative external effects which exist in peripheral areas. In the long-term perspective, cooperation should serve to: ensure stability of natural capital, dissemination of knowledge and innovation as well as break the convention of simple industrialization thanks to the feedback of network economy. The sole meeting point of the three processes is a territory, the delineation of which should be executed by social actors capable of identifying resources that are available on it. The authors of the article present the justification of t…

Representing compact sets of compact operators and of compact range vector measures

1987

Stationary and Nontationary Response Probability Density Function of a Beam under Poisson White Noise

2011

In this paper an approximate explicit probability density function for the analysis of external oscillations of a linear and geometric nonlinear simply supported beam driven by random pulses is proposed. The adopted impulsive loading model is the Poisson White Noise , that is a process having Dirac’s delta occurrences with random intensity distributed in time according to Poisson’s law. The response probability density function can be obtained solving the related Kolmogorov-Feller (KF) integro-differential equation. An approximated solution, using path integral method, is derived transforming the KF equation to a first order partial differential equation. The method of characteristic is the…

Spontaneous Raman Scattering Spectrum of Gaseous IrF6 in the Ground Electronic State

1996

On the spectrum of semi-classical Witten-Laplacians and Schrödinger operators in large dimension

2005

We investigate the low-lying spectrum of Witten–Laplacians on forms of arbitrary degree in the semi-classical limit and uniformly in the space dimension. We show that under suitable assumptions implying that the phase function has a unique local minimum one obtains a number of clusters of discrete eigenvalues at the bottom of the spectrum. Moreover, we are able to count the number of eigenvalues in each cluster. We apply our results to certain sequences of Schrodinger operators having strictly convex potentials and show that some well-known results of semi-classical analysis hold also uniformly in the dimension.