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Search Results: 1 - 10 of 144996 matches for " F. Lombardi "
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Repairing VLSI/WSI Redundant Memories with Minimum Cost
Huang Weikang,F.Lombardi
计算机科学技术学报 , 1990,
Abstract: A new approach to repair memory chips with redundancy is proposed.This approach s based on the minimization of the repair cost.Algorithms for cost driven repair are presented.The algorithms can be executed either on -line(concurrently with the testing of the memory),or off-lin(at completion of testing).Analytical expressions for the repair cost under both circumstances are given.The presented algorithms are also perfect in the sense that they can correctly diagnose a repairable/unrepairable memory and find the optimal repair-solution.
Synchronous-scan fluorescence and the complexation of copper (II) ions by humic substances
Lombardi, Ana T;Jardim, Wilson F;
Journal of the Brazilian Chemical Society , 1997, DOI: 10.1590/S0103-50531997000400004
Abstract: two fluorescence bands were detected using synchronous-scan fluorescence on samples of terrestrially derived humic substances (lex/lem 380/398, 440/458 nm) without the addition of copper. a third band (lex/lem 502/520 nm) was detected after severe quenching of the second band (lex/lem 440/458 nm) caused by additions of copper. a more energetic band (lex/lem 333/351 nm) is present in marine dom, but absent in the terrestrial material. the effects of copper on both the intensity and shape of the synchronous-scan fluorescence spectra and this technique’s potential use as a tracer are discussed.
Compensation of CO2 emissions by air travels: an example
Lombardi F,Lasserre B,Marchetti M
Forest@ , 2011, DOI: 10.3832/efor0652-008
Abstract: In recent years, several aircraft companies launched awareness campaigns, offering to their passenger the opportunity to known and also calculate their own per-capita CO2 emissions related to the flight they are going to make. Such campaigns permits to the passenger to pay a volunteer contribution in order to compensate their CO2 emissions. In this short communication, some programs undertaken by airline companies are showed. These initiatives are all characterized by a common denominator: the achievement of concrete, proved and verifiable results to compensate the aircraft CO2 emissions. Moreover, also a concrete case is reported as example: it is useful to show which is the per capita CO2 emission for a sample flight in Europe and, quantitatively, the amount of compensation measurements. Finally, this communication highlights on how the estimates of such measurements are usually miscalculated, considering that the capability of forest ecosystems to store CO2 are often underestimated.
Errata Corrige - Compensation of CO2 emissions by air travels: an example
Lombardi F,Lasserre B,Marchetti M
Forest@ , 2011, DOI: 10.3832/efor0667-008
Abstract: We publish upon authors’ request the following corrigendum to the commentary previously issued on Forest@, volume 8, year 2011, pp. 45-48. - doi: 10.3832/efor0652-008.
A Diffusion Model for Classical Chaotic Compound Scattering
F. Leyvraz,M. Lombardi,T. H. Seligman
Physics , 2000, DOI: 10.1016/S0167-2789(01)00305-0
Abstract: We consider the classical map proposed previously to be the exact classical analogue of Rydberg Molecules calculated with the approximations relevant to the multi-channel quantum defect theory. The resulting classical map is analyzed at energies above the threshold for the Rydberg electron. At energies very near to this threshold we find the possibility of bounded motion for positive energy due to conserved tori as well as the possibility of forming a compound system, i.e. a system where the particle is trapped for long times before emerging again to the continuum. The compound scattering displays unusual features for short time behavior. A diffusion model explains these features.
On the comparison between MASS and G-SCIDAR techniques
E. Masciadri,G. Lombardi,F. Lascaux
Physics , 2013, DOI: 10.1093/mnras/stt2194
Abstract: The Multi Aperture Scintillation Sensor (MASS) and the Generalized-Scintillation Detection and Ranging (Generalized SCIDAR) are two instruments conceived to measure the optical turbulence (OT) vertical distribution on the whole troposphere and low stratosphere (~ 20 km) widely used in the astronomical context. In this paper we perform a detailed analysis/comparison of measurements provided by the two instruments and taken during the extended site testing campaign carried out on 2007 at Cerro Paranal and promoted by the European Southern Observatory (ESO). The main and final goal of the study is to provide a detailed estimation of the measurements reliability i.e dispersion of turbulence measurements done by the two instruments at different heights above the ground. This information is directly related to our ability in estimating the absolute value of the turbulence stratification. To better analyse the uncertainties between the MASS and the GS we took advantage of the availability of measurements taken during the same campaign by a third independent instrument (DIMM - Differential Imaging Motion Monitor) measuring the integrated turbulence extended on the whole 20 km. Such a cross-check comparison permitted us to define the reliability of the instruments and their measurements, their limits and the contexts in which their use can present some risk.
The discovery of high-Tc superconductivity-unexpected discovery, unconventional behaviour
A. Andreone,A. Barone,F. Lombardi,F. Tafuri
Iranian Journal of Physics Research , 2006,
Abstract: A brief review on some peculiar properties of high temperature superconductors (HTS) is presented. Twenty years after the discovery, it appears more and more clear that the behaviour of this new class of materials is remarkably different from what have been re-classified as “conventional” superconductors. In the following we will focus our attention on the study of two phenomena, namely the Josephson effect and the Meissner effect, where the unconventional nature of superconductivity in HTS offers exciting perspectives both for the understanding of the underlying mechanism, so far still unknown, and for the large potential of applications in different areas of superconducting electronics.
Intelligent approach for optimal modeling of manufacturing systems
V. Gecevska,F. Cus,F. Lombardi,V. Dukowski
Journal of Achievements in Materials and Manufacturing Engineering , 2005,
Abstract: Purpose: This paper proposes a methodology for analysis and modeling of machining conditions by optimal determination of the cutting parameters in multi-pass NC machining operations.Design/methodology/approach: This paper proposes optimal determination of the cutting parameters by using a deterministic method (DM) and a genetic algorithm (GA). In the research, it is created the complex mathematical model for design of the cutting condition for machining process. In next phase, it is created a numerical algorithm for optimization and its developed software called OPTIMAD (Optimization of Milling and Drilling), by using DM. Also, it is created software, caled GAMO (Genetic Algorithm for Machining Operation), as a GA program modul based of the elementary pseudo-code for GA, with using the MatLAB program language and C++ developed rutines.Findings: Modeling of optimal cutting parameters, as a part of process planning, enables generating of manufacturing data and knowledge representation in machining process plan. Verification of optimized cutting parameters in real machining condition has done confirmation for design of cutting parameters by virtual modelling, using optimization methodologies OPTIMAD and GAMO.Research limitations/implications: The optimization approach is proposed and its uses optimization of mathematical model using a classic and heuristic methods. In this research, GA based optimization method and deterministic optimization method are developed and there implementations into real manufacturing process are analyzed.Practical implications: Use of proposed aproach resulted in improved productivity and efficiency of machining process where the cutting conditions are designed by OPTIMAD and GAMO softwares. In the future, this results will be integrated in computer system for process planning.Originality/value: The paper describes a method for eliminating the need for using the extensive user intervention in CAM processes, during determination of cutting parameters.
Nonleptonic Cabibbo Favoured $B$-Decays and $CP$-Asymmetries for Charmed Final Hadron States in Isgur and Wise Theory
F. Buccella,F. Lombardi,G. Miele,P. Santorelli
Physics , 1993, DOI: 10.1007/BF01498623
Abstract: The Cabibbo allowed non-leptonic $B$-decays in two hadrons are studied, within the factorization hypothesis, in the framework of Isgur and Wise theory for the matrix elements of the $\Delta B=-\Delta C=\pm 1$ weak currents. The $SU(2)_{HF}$ symmetry relates $|\Delta B|=1$ to $|\Delta C|=1$ currents, which have been measured in the semileptonic strange decays of charmed particles. By assuming colour screening and allowing for $SU(3)$ invariant contributions from the annihilation terms with charmed final states one is able to comply with the present experimental knowledge.\\ The $CP$ violating asymmetries in neutral $B$ decays are given for charmed final states in terms of the $K-M$ angles. With the central values found for the annihilation parameters there is a destructive (constructive) interference between the direct and annihilation terms in the Cabibbo allowed (doubly forbidden) amplitudes for the decays into $D^{0}(D^{*0})\pi^0$ and $D^0\rho^0$ so that they may be of the same order. This would imply large asymmetries, for which however our present knowledge on the amplitudes does not allow to predict even their sign.\\ We have better confidence in our predictions for the charged final states than the neutral ones and can draw the conclusion that the detection of the corresponding asymmetries requires, at least, $10^6$ tagged neutral $B$-particles.
''Active'' Teleportation of a Quantum Bit
S. Giacomini,F. Sciarrino,E. Lombardi,F. De Martini
Physics , 2002, DOI: 10.1103/PhysRevA.66.030302
Abstract: We report the experimental realization of the ''active'' quantum teleportation (QST) of a one-particle entangled qubit. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing a 8m optical delay line and a single-photon triggered fast Electro-Optic Pockels cell. A large value of teleportation ''fidelity'' was attained: F = (90 +/- 2)%. Our work follows the line recently suggested by H. W. Lee and J. Kim, Phys. Rev. A 63, 012305 (2000) and E.Knill, R.Laflamme and G.Milburn Nature 409: 46 (2001).
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