Search results for "Ham"
showing 10 items of 2612 documents
$PT$-symmetric graphene under a magnetic field
2016
We propose a $PT$-symmetrically deformed version of the graphene tight-binding model under a magnetic field. We analyze the structure of the spectra and the eigenvectors of the Hamiltonians around the $K$ and $K'$ points, both in the $PT$-symmetric and $PT$-broken regions. In particular we show that the presence of the deformation parameter $V$ produces several interesting consequences, including the asymmetry of the zero-energy states of the Hamiltonians and the breakdown of the completeness of the eigenvector sets. We also discuss the biorthogonality of the eigenvectors, which {turns out to be} different in the $PT$-symmetric and $PT$-broken regions.
Volume I. Introduction to DUNE
2020
Journal of Instrumentation 15(08), T08008 (1-228) (2020). doi:10.1088/1748-0221/15/08/T08008
Effects of Sanctions, Moral Beliefs, and Neutralization on Information Security Policy Violations Across Cultures
2020
A principal concern of organizations is the failure of employees to comply with information security policies (ISPs). Deterrence theory is one of the most frequently used theories for examining ISP violations, yet studies using this theory have produced mixed results. Past research has indicated that cultural differences may be one reason for these inconsistent findings and have hence called for cross-cultural research on deterrence in information security. To address this gap, we formulated a model including deterrence, moral beliefs, shame, and neutralization techniques and tested it with the employees from 48 countries working for a large multinational company. peerReviewed
La teoria della vergogna reintegrativa di Braithwaite
2021
Riflessione sulla teoria elaborata da John Braithwaite nota con il nome di teoria della vergogna reintegrativa (reintegrative shaming) che rappresenta l’esempio teoria integrata generale (che si rivolge dunque a più condotte criminali) e di tipo «fianco a fianco» (side-by-side). Reflection on the theory developed by John Braithwaite known as the theory of reintegrative shaming which represents the example general integrated theory (which therefore addresses several criminal conducts) and of the "side-by-side" type (side-by -side).
Direct Measurement of Mammographic X-Ray Spectra with a Digital CdTe Detection System
2012
In this work we present a detection system, based on a CdTe detector and an innovative digital pulse processing (DPP) system, for high-rate X-ray spectroscopy in mammography (1–30 keV). The DPP system performs a height and shape analysis of the detector pulses, sampled and digitized by a 14-bit, 100 MHz ADC. We show the results of the characterization of the detection system both at low and high photon counting rates by using monoenergetic X-ray sources and a nonclinical X-ray tube. The detection system exhibits excellent performance up to 830 kcps with an energy resolution of 4.5% FWHM at 22.1 keV. Direct measurements of clinical molybdenum X-ray spectra were carried out by using a pinhole…
Instrumentation for time-of-flight elastic recoil detection analysis
2016
Time-of-flight elastic recoil detection is an ion beam based method to analyze the elemental composition of thin film samples at different depths. In order to improve the mass resolution and to enable kinematic correction a position sensitive gas ionization chamber energy detector was constructed. This detector along with pre-existing timing detectors were connected to a modern fully digitizing data acquisition setup. This thesis describes the design of these instruments, including all aspects from the mechanical design of the gas ionization detector to the algorithm and software development of the digitizing acquisition setup. The performance of the system has been studied with measurements …
Effective Hamiltonians in Nonrelativistic Quantum Electrodynamics
2021
In this paper, we consider some second-order effective Hamiltonians describing the interaction of the quantum electromagnetic field with atoms or molecules in the nonrelativistic limit. Our procedure is valid only for off-energy-shell processes, specifically virtual processes such as those relevant for ground-state energy shifts and dispersion van der Waals and Casimir-Polder interactions, while on-energy-shell processes are excluded. These effective Hamiltonians allow for a considerable simplification of the calculation of radiative energy shifts, dispersion, and Casimir-Polder interactions, including in the presence of boundary conditions. They can also provide clear physical insights int…
«Men for oss er det én Gud, Faderen» : et kritisk blikk på Richard Bauckhams kristologi
2012
Author's version of an article in the journal: Teologisk Tidsskrift. Also available from the publisher at: http://www.idunn.no/ts/tt/2012/01/art06 The article consists of two parts: Part one seeks to demonstrate (contra Bauckham) that Jewish monotheism in the Second Temple period was of a flexible character. It argues that Jewish writers in this period could attribute «divine functions» to figures beside God, while still feeling committed to «one God». The Jewish monotheism of this period was therefore not constituted by functions or characteristics, but rather by the exclusive worship of the one God. Part two argues that Paul describes Jesus with a high position beside God, while still fee…
La peine de mort dans la doctrine de Jeremy Bentham
2010
International audience
Efficiencies of the drift chambers in the EMMA experiment
2013
Cosmic rays are high-energy subatomic particles which travel almost at the speed of light all over the space. The shape of the cosmic ray energy spectrum is measured experimentally, but it is not perfectly understood. The slope of the spectrum at high energies is constant up to the knee energy (about 10^15 eV) where the slope steepens. The knee has been tried to be explained by several models which aim to describe the origin and the acceleration mechanisms of the cosmic ray. The stars and the shockwaves from supernova explosions are believed to be at least a part of cosmic ray evolution. The cosmic rays were found in the early 20th century and they have been studied with several methods. Wh…