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OALib Journal期刊

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Itinerari Musicali con la Wiild
Elisabetta Nanni
Form@re : Open Journal per la Formazione in Rete , 2013,
Abstract: La Wiild, acronimo di Wiimote Lavagna Digitale, è uno strumento didattico che utilizza il telecomando della Wii, il famoso gioco della Nintendo, insieme a un software libero, rendendolo così estremamente versatile. Non vincolato a software proprietario, il suo utilizzo è legato alla capacità dell’insegnante di ripartire dalla didattica, dalle risorse selezionate e dall’epistemologia di ogni singola disciplina, trovando così nel proprio contesto un ruolo per le tecnologie. Il contributo presenta ipotesi di lavoro per l’educazione musicale nella scuola secondaria di primo grado che si sviluppano sia attraverso lo studio del rapporto suono/segno con affinità pittoriche e successiva codificazione grafica, sia attraverso un’attività di laboratorio in cui co-costruire percorsi storico-musicali. La Wiild diventerà davvero utile ed efficace nel momento in cui, affiancando le risorse selezionate dal docente, verrà utilizzata senza essere notata, giocando un ruolo di strumento tecnologico normale e trasparente .
Delia Ana Fanego (a cura di), Quebrantos. Historias del exilio argentino en Italia. Prologo di Juan Gelman, Ediciones Fabro Buenos Aires, 2010 (rese a) Delia Ana Fanego (a cura di), Quebrantos. Historias del exilio argentino en Italia. Prologo di Juan Gelman, Ediciones Fabro Buenos Aires, 2010 (recensione)
Susanna Nanni
Confluenze. Rivista di Studi Iberoamericani , 2011,
Abstract:
The Hydrogen Atom: a Review on the Birth of Modern Quantum Mechanics
Luca Nanni
Physics , 2015,
Abstract: The purpose of this work is to retrace the steps that were made by scientists of XX century, like Bohr, Schrodinger, Heisenberg, Pauli, Dirac, for the formulation of what today represents the modern quantum mechanics and that, within two decades, put in question the classical physics. In this context, the study of the electronic structure of hydrogen atom has been the main starting point for the formulation of the theory and, till now, remains the only real case for which the quantum equation of motion can be solved exactly. The results obtained by each theory will be discussed critically, highlighting limits and potentials that allowed the further development of the quantum theory.
Revisiting the Majorana Relativistic Theory of Particles with Arbitrary Spin
Luca Nanni
Physics , 2015,
Abstract: In 1932 Ettore Majorana published an article proving that relativity allows any value for the spin of a quantum particle and that there is no privilege for the half integer spin. The Majorana idea was so innovative for the time that the scientific community understood its importance only towards the end of the thirties. This paper aims to highlight the depth of the scientific thought of Majorana that, well in advance of its time, opened the way for modern particle physics and introduced for the first time the idea of a universal quantum equation, able to explain the behavior of particles with arbitrary spin and of any nature, regardless the value of their speed. It will be analyzed in detail and made explicit all the steps that lead to the physical mathematical formulation of the Majorana theory. A part of these steps require basic knowledge of quantum physics but not for this should be regarded as trivial since they show the physical meaning hidden into the structure of the equation. Moreover, the explicit method for the construction of the infinite matrices will be given, by which the infinite components of the wave functions representing the fundamental and excited states of the particle are calculated.
A New Derivation of the Time-Dependent Schr?dinger Equation from Wave and Matrix Mechanics
Luca Nanni
Physics , 2015,
Abstract: An alternative method is proposed for deriving the time dependent Schroedinger equation from the pictures of wave and matrix mechanics. The derivation is of a mixed classical quantum character, since time is treated as a classical variable, thus avoiding any controversy over its meaning in quantum mechanics. The derivation method proposed in this paper requires no ad hoc assumption and avoids going through a second-order differential equation that can be reduced to the well known time-dependent Schroedinger equation only postulating a complex wavefunction with an exponential time dependence, as did by Schroedinger in its original paper of 1926.
A genetic approach for building different alphabets for peptide and protein classification
Loris Nanni, Alessandra Lumini
BMC Bioinformatics , 2008, DOI: 10.1186/1471-2105-9-45
Abstract: The new approach has been tested in three peptide classification problems: HIV-protease, recognition of T-cell epitopes and prediction of peptides that bind human leukocyte antigens. The tests demonstrate that the idea of training a pool classifiers by reduced alphabets, created using a Genetic Algorithm, allows an improvement over other state-of-the-art feature extraction methods.The validity of the novel strategy for creating reduced alphabets is demonstrated by the performance improvement obtained by the proposed approach with respect to other reduced alphabets-based methods in the tested problems.In the literature several feature extraction approaches [1] have been proposed for the representation of peptides (e.g orthonormal encoding, n-grams, ...); some of them have been used for building ensembles of classifiers based on the perturbation of features (i.e. each classifier is trained using a different feature set). Nanni and Lumini in [2] proposed to build an ensemble of classifiers where each classifier is trained using a different physicochemical property of the amino acids, the selection of the best physicochemical properties to be combined is performed by Sequential Forward Floating Selection [3]; the same feature extraction is also used in [4] to train a machine learning approach for protein subcellular localization. A system for the recognition of T-cell epitopes is presented in [5] based on the combination of two Support Vector Machines (SVM). The first SVM is trained using the information on amino acid positions, while the second SVM is trained using information extracted from the sparse indicator vector and the BLOSUM50 matrix.In particular, in [6] it is proposed an ensemble of SVM classifiers where each classifier is trained using a different N-peptide composition with reduced amino acid alphabets for larger values of N. The authors report that the ensemble of SVMs outperforms a stand-alone SVM trained using the well-known 2-peptide composition with th
Preface - 4 th COST 539 Workshop “Fabrication, Properties & Applications of Electroceramic Nanostructures”
Paolo Nanni,Biljana Stojanovi?
Processing and Application of Ceramics , 2009,
Abstract:
Il Badalone di Filippo Brunelleschi e l’iconografia del navigium tra Guido da Vigevano e Leonardo da Vinci. In appendice: Il privilegio del Badalone (trascrizione e note storico-archivistiche)
Romano Nanni,Veronica Vestri
Annali di Storia di Firenze , 2011,
Abstract: Nel giugno 1421 le autorità di Firenze concessero a Filippo Brunelleschi un privilegium per sfruttare i diritti di uso di un nuovo tipo di imbarcazione che il grande architetto aveva inventato, il badalone. Varie ipotesi sono state fatte riguardo le caratteristiche di questo naviglio, ma determinare con esattezza cosa sia stato il badalone non è facile, a causa della mancanza di documentazione eloquentemente descrittiva. Qui si avanzano alcune congetture intorno al suo uso e caratteristiche. Da una parte una rilettura degli archivi dell’Opera del Duomo di Firenze, particolarmente dei documenti relazionabili all’impresa del Brunelleschi e alla navigazione dell’Arno nelle diverse stagioni dell’anno; e, dall’altra parte, un’indagine sulla tradizione iconografica della navigazione dal Medio Evo al primo Rinascimento, ci consentono di identificare meglio i problemi a cui l’invenzione brunelleschiana intendeva rispondere, suggerendo altre ipotesi sull’identità del badalone.
When Fingerprints Are Combined with Iris - A Case Study: FVC2004 and CASIA
Alessandra Lumini,Loris Nanni
International Journal of Network Security , 2007,
Abstract: This paper presents novel studies on fusion strategies for personal identification using fingerprint and iris biometrics. The purpose of our paper is to investigate whether the integration of iris and fingerprint biometrics can achieve performance that may not be possible using a single biometric technology. Moreover we are interested in evaluating the correlation among the best state of art algorithms for fingerprint verification presented at FVC2004. We show that the fusion among some competitors of FVC2004 permits a drastically reduction of the performance. Particularly interesting is the result obtained by combining the competitors of FVC2004 and an IRIS matcher in terms of EER (the most used parameter in the evaluation of real identification systems), significantly lower than for other approaches. This indicates that the intrinsic error of the system is very low and tends to 0 for some of the tests carried out. The results of this paper confirm that a multimodal biometric can overcome some of the limitations of a single biometric resulting in a substantial performance improvement.
Short-term stress: the case of transport and slaughter
Leonardo Nanni Costa
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2009.s1.241
Abstract: Short-term stressors such as transport and slaughter include psychological and physical stimuli that might be aversive for the animals. Restraint, manipulation and sudden change lead to fear, or psychological stress, while hunger, thirst, fatigue, injury and extreme thermal conditions are considered as physical stresses. Animal responses to these stimuli include behavioural and physiological changes devoted to coping with adverse situations. If the recovery or the adaptation fails, the consequences can be extremely serious, ranging from weight loss and death to impaired carcass and meat quality. As the stress during transport and slaughter is unavoidable, only the knowledge of the physiological and behavioural needs of the animals during all procedures from pre-transport handling to stunning, together with the correct use of the facilities for handling and transportation, can minimize the intensity and the duration of stress. The final goal is to improve transport and slaughter conditions for the animal and, as a consequence, animal welfare and meat quality.
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