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Search Results: 1 - 10 of 1083 matches for " Giancarlo Cicero "
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Ab initio Study of Misfit Dislocations at the SiC/Si(001) Interface
Giancarlo Cicero,Laurent Pizzagalli,Alessandra Catellani
Physics , 2007, DOI: 10.1103/PhysRevLett.89.156101
Abstract: The high lattice mismatched SiC/Si(001) interface was investigated by means of combined classical and ab initio molecular dynamics. Among the several configurations analyzed, a dislocation network pinned at the interface was found to be the most efficient mechanism for strain relief. A detailed description of the dislocation core is given, and the related electronic properties are discussed for the most stable geometry: we found interface states localized in the gap that may be a source of failure of electronic devices.
Theoretical investigations of a highly mismatched interface: the case of SiC/Si(001)
Laurent Pizzagalli,Giancarlo Cicero,Alessandra Catellani
Physics , 2007, DOI: 10.1103/PhysRevB.68.195302
Abstract: Using first principles, classical potentials, and elasticity theory, we investigated the structure of a semiconductor/semiconductor interface with a high lattice mismatch, SiC/Si(001). Among several tested possible configurations, a heterostructure with (i) a misfit dislocation network pinned at the interface and (ii) reconstructed dislocation cores with a carbon substoichiometry is found to be the most stable one. The importance of the slab approximation in first-principles calculations is discussed and estimated by combining classical potential techniques and elasticity theory. For the most stable configuration, an estimate of the interface energy is given. Finally, the electronic structure is investigated and discussed in relation with the dislocation array structure. Interface states, localized in the heterostructure gap and located on dislocation cores, are identified.
A New Physical Interpretation of Archimedes’ Principle  [PDF]
Giancarlo Cavazzini
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61020
Abstract: The interpretation of the equilibrium of a solid body floating on the surface of a liquid body is well known as the “Archimedes’ Principle”. Presently, the equilibrium of the solid body is interpreted as the result of the concurrence of two mechanical actions which are equivalent and opposite: the “weight” of the body, directed downwards, and the “Archimedes’ force” having a magnitude equivalent to the weight of the volume of liquid displaced by the volume of the body immersed in the liquid, directed upwards. We show arguments proving that this interpretation is not a correct physical interpretation. The same arguments show that a new different interpretation is a correct one. The new interpretation is based on the hypothesis that the “weight” of a body immersed in a body-medium is proportional to the volume of the body immersed in the body-medium and to the difference in density between the matter of the body and the matter of the body-medium. Accordingly, if a body is completely immersed in a body-medium, there is only one mechanical action on the body. This action may be downwards or upwards, or its magnitude may be zero. In this last case, the body is in equilibrium within the body-medium.
Representa??o, retrato e drama
Araujo, Cicero;
Lua Nova: Revista de Cultura e Política , 2006, DOI: 10.1590/S0102-64452006000200008
Abstract: the article elaborates on two artistic metaphors to search for contrasting modes of thinking on political representation. the metaphors suggest two very distinctive ideals of the good political order - despite a certain trend of the traditional political lexicon to mix them up - and make their own impacts on what to expect from the authorities? practices of representation.
Apresenta o
Araujo Cicero
Lua Nova: Revista de Cultura e Política , 2003,
On the second Hamming weight of some Reed-Muller type codes
Cicero Carvalho
Mathematics , 2013,
Abstract: We study affine cartesian codes, which are a Reed-Muller type of evaluation codes, where polynomials are evaluated at the cartesian product of n subsets of a finite field F_q. These codes appeared recently in a work by H. Lopez, C. Renteria-Marquez and R. Villareal and, in a generalized form, in a work by O. Geil and C. Thomsen. Using methods from Gr\"obner basis theory we determine the second Hamming weight (also called next-to-minimal weight) for particular cases of affine cartesian codes and also some higher Hamming weights of this type of code.
Large-Scale Structure Formation via Quantum Fluctuations and Gravitational Instability  [PDF]
Fernando Porcelli, Giancarlo Scibona
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.56058

This is a review of the status of the universe as described by the standard cosmological model combined with the inflationary paradigm. Their key features and predictions, consistent with the WMAP (Wilkinson Microwave Anisotropies Probe) and Planck Probe 2013 results, provide a significant mechanism to generate the primordial gravitational waves and the density perturbations which grow over time, and later become the large-scale structure of the universe—from the quantum fluctuations in the early era to the structure observed 13.7 billion later, our epoch. In the single field slow-roll paradigm, the primordial quantum fluctuations in the inflaton field itself translate into the curvature and density perturbations which grow over time via gravitational instability. High density regions continuously attract more matter from the surrounding space, the high density regions become more and more dense in time while depleting the low density regions. At late times the highest density regions peaks collapse into the large structure of the universe, whose gravitational instability effects are observed in the clustering features of galaxies in the sky. Thus, the origin of all structure in the universe probably comes from an early era where the universe was filled with a scalar field and nothing else.

A Small WWII Italian Bunker in Heraclea Minoa (Sicily)  [PDF]
Giancarlo T. Tomezzoli
Advances in Anthropology (AA) , 2015, DOI: 10.4236/aa.2015.53013
Abstract: In this article, a WWII small Italian bunker evocative of the emotions caused to the Sicilian population by the WWII terminated 70 years ago was presented. It is a bunker of type T Monoarma (i.e. bunkers for a single weapon), indicated also as type Ispettorato, and located on the Sicilian seashore, near the archaeological site of the ancient Greek city of Heraclea Minoa.
The German Base “the Bank” at M?rs-érigné (Anjou-FR)  [PDF]
Giancarlo T. Tomezzoli
Archaeological Discovery (AD) , 2016, DOI: 10.4236/ad.2016.41004
Abstract: In general, history, structure and life in the German military bases in France during the period of the Occupation are not well known because of the past military secrecy and the present lack of surviving witnesses and relevant documentation. However, in the case of the German base at M?rs-Erigné, much information is now available through the researches of Mr. Suquet and my ascertainment on the terrain of the preservation state of its vestiges following the memory duty proposed by Mr. Suquet.
The “Fliegerhorst” of Neubiberg (Munich-Germany)  [PDF]
Giancarlo T. Tomezzoli
Archaeological Discovery (AD) , 2016, DOI: 10.4236/ad.2016.42006
Abstract: The investigation of the organization, evolution and preservation state of the Neubiberg airfield near Munich (Bavaria-Germany), now at seventy years after the conclusion of the World War II, reveals that its preservation state is good but menaced by the installation of sport facilities and the possible further expansion of the areas of the municipalities of Neubiberg, Unterhaching and of the Federal Army University. On 1991 at the end of the military operations, the airfield has not resumed its original role of sport airfield that is the reason of its construction. This would have ensured its operative survival and the survival of a landing place for aircrafts in distress.
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