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Items 1-20 di 35
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A study on iron-chalcogenides superconductors: from samples preparation to physical properties
(Universita degli studi di Salerno, 2017-03-14)In the scientific community there is a great interest to explore new superconducting materials suitable for high field applications in order to meet the needs of industrial claims. In this framework, newly discovered ... -
Accurate mesurements of spectroscopic line parameters of atmospheric relevant molecules
(Universita degli studi di Salerno, 2017-07-14)This thesis deals with the development of frequency-stabilized laser absorption spectrometers in the near-infrared to perform precision measurements on molecular spectra of atmospheric interest, such as acetylene and carbon ... -
An insight into gravitational microlensing and the search for exoplanetary systems
(Universita degli studi di Salerno, 2015-04-30)Nature always offers astonishing shows to the humankind. Gravitational lensing is one of the most intriguing effects which can be observed, and the astrophysical applications of such a phenomenon span from particle physics ... -
Constraining models of extended theories of gravity with terrestrial and astrophysical experiments
(Universita degli studi di Salerno, 2015-04-30)In this Thesis we report a general review of Extended Theories of Gravity and the fundamental aspects of General Relativity. We show the technicality of development of field equation with respect to Newtonian, Post-Newtonian ... -
Crystal growth and physical properties of helimagnetic oxides
(Universita degli studi di Salerno, 2017-07-13)This work is focused on two helimagnetic materials: Ba2CuGe2O7 and Cu3Nb2O8. Recent studies report a number of interesting anisotropic proper- ties [1, 2, 3]. Ba2CuGe2O7 melilite oxide shows a complex magnetic behaviour, ... -
Detailed study of local and regional seismicity recorded by the underground UNDERSEIS array at Gran Sasso (Central Italy)
(Universita degli studi di Salerno, 2011-05-13)In this work I analyzed seismic data recorded by two arrays installed in the area of Mt. Gran Sasso (Central Italy), one located at 1.4 km depth (UNDERSEIS), and the other at surface (Fontari). The aim is to compare the ... -
Dissipation, mixing and two level system in quantum field theory
(Universita degli studi di Salerno, 2012-04-30)In this dissertation we discuss several aspects of a two level system (qubit) in the context of quantum mechanics and quantum field theory. The presence of geometrical phases in the evolution of a qubit state is shown. We ... -
Electric transport properties of S/F hybrids: weak and inhomogenous ferromagnet
(Universita degli studi di Salerno, 2012-03-30)Superconductivity (S) and ferromagnetism (F) are competing phases whose coexistence is unlikely to occur. Exceptions require a non−uniform profile both for the pairing and the magnetization, as in the case of the FFLO state ... -
Exact solutions in general relativity and alternative theories of gravity: mathematical and physical properties
(Universita degli studi di Salerno, 2011-06-06)In this thesis, we discuss several subjects connected with the framework of GR, in order to characterize astrophysical compact objects. The main purpose is to provide simple models describing gravitational fields generated ... -
Flavor mixing in quantum field theory and quantum information
(Universita degli studi di Salerno, 2011-05-10)After reviewing the formalism for describing flavor mixing, both in Quantum Mechanics and Quantum Field Theory, some consequences along three different directions are studied. First, it is proposed that flavor mixing can ... -
Graphene and carbon nanotubes in transistors, diodes and field emission devices
(Universita degli studi di Salerno, 2017-03-22)Since their discovery, graphene and carbon nanotubes have been playing an important role in nanoscience and nanotechnology thanks to their extraordinary physical and chemical properties. With silicon-based electronics ... -
Graphene/silicon Schottky diode
(Universita degli studi di Salerno, 2020-02-10)In this works we fabricated four graphene/silicon heterojunctions, which differ for structure and substrate type, and performed electrical and optical characterization. The first device was realized by depositing a layer ... -
The ground deformations: tools, methods and application to some Italian volcanic regions
(Universita degli studi di Salerno, 2012-06-13)The objective of this thesis is the study of slow deformation of the soil as a result of intrusion of magma inside the magmatic chambers of some volcanoes located in Southern Italy. In particular, the Mt. Vesuvius and Campi ... -
Improvements in the acoustical modelling of traffic noise prediction: theoretical and experimental results
(Universita degli studi di Salerno, 2011-04-21)Traffic acoustical noise is one of the most important component of the urban environmental pollution in densely populated areas all over the world. A very recent ACI-Censis study [1] on Italian urban areas shows that car ... -
Influence of grains on the electromagnetic ac response of superconducting materials
(Universita degli studi di Salerno, 2016-04-20)Type II superconducting materials are technologically interesting since they are characterized by the existence of a superconducting phase even after the penetration of the magnetic field inside them. In fact, while type ... -
Interface effects in superconducting heterostructures
(Universita degli studi di Salerno, 2016-04-14)This work debates a theoretical investigation of the interfacial effects about heterostructures with normal metals and superconductors. At the beginning we will introduce the basic physical phenomena our calculations deal ... -
Interplay of spin-orbital correlations and structural distortions in Ru- and Cr- based perovskite systems
(Universita degli studi di Salerno, 2012-07-02)The transition metal oxides are emerging as the natural playground where the intriguing effects induced by electron correlations can be addressed. Since the s electron of the transition metals are transferred to the oxygen ... -
Investigation of the groundwater-river interaction, using Radon-222 as a natural tracer, in a karst Mediterranean environment like in the case study of the Bussento river basin
(Universita degli studi di Salerno, 2010-04-27)The naturally-occurring radionuclides have proven to be powerful tools for assessing the time dependency of GSI processes. The radionuclide 222Rn (referred to as radon) has the advantage of being a radioactive noble gas, ... -
Josephson junctions, quantum interference devices and applications in the field of dark matter search
(Universita degli studi di Salerno, 2016-04-13)In questa Tesi di Dottorato, io e il mio supervisor, il Prof. Roberto De Luca, abbiamo analizzato alcuni particolari dispositivi superconduttori, le giunzioni Josephson e gli SQUIDs (Superconducting Quantum Interference ... -
Magnetic orbital and transport properties in LaMnO3 based based heterostructures
(Universita degli studi di Salerno, 2011-05-13)This thesis work deals with the magnetic, orbital and transport properties of (LaMnO3)2N(SrMnO3)N digital superlattices and of LaxMnO3-d thin films, both deposited by molecular beam epitaxy (MBE) technique on SrTiO3 ...
