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21.
2LEV-D2P4: a package of high-performance preconditioners for scientific and engineering applications
Alfredo Buttari Pasqua D’Ambra Daniela di Serafino Salvatore Filippone 《Applicable Algebra in Engineering, Communication and Computing》2007,18(3):223-239
We present a package of parallel preconditioners which implements one-level and two-level Domain Decomposition algorithms
on the top of the PSBLAS library for sparse matrix computations. The package, named 2LEV-D2P4 (Two-LEVel Domain Decomposition
Parallel Preconditioners Package based on PSBLAS), currently includes various versions of additive Schwarz preconditioners
that are combined with a coarse-level correction to obtain two-level preconditioners. A pure algebraic formulation of the
preconditioners is considered. 2LEV-D2P4 has been written in Fortran~95, exploiting features such as abstract data type creation,
functional overloading and dynamic memory management, while providing a smooth path towards the integration in legacy application
codes. The package, used with Krylov solvers implemented in PSBLAS, has been tested on large-scale linear systems arising
from model problems and real applications, showing its effectiveness. 相似文献
22.
Ambra Giovannelli Erika M. Archilei Giuseppina Di Lorenzo Coriolano Salvini Muhammad A. Bashir Giuseppe Messina 《国际能源研究杂志》2021,45(1):355-378
For power production, the emerging technologies of supercritical carbon dioxide (S‐CO2) cycles show potential advantages if compared to conventional plants. The current bottleneck in exploiting such cycles is the development of novel components such as turbomachines and heat‐exchangers. This paper focuses on the layout arrangement and machinery design of a novel power‐block for a 10 to 15 MW supercritical carbon dioxide plant. The applied design procedure involves 0D and 1D models implemented using an in‐house Fortran code, and 3D computational fluid dynamics ( CFD) analyses using ANSYS‐CFX. Novel configurations of the power block were designed, starting with the same primary thermal source. At nominal conditions, expected overall output powers from 13.2 to 16.2 MW were found. Finally, some qualitative considerations were included in the discussion to compare the analysed arrangements. 相似文献
23.
Luis Kosteski Ricardo Barrios D’Ambra Ignacio Iturrioz 《International Journal of Fracture》2012,174(2):139-161
The crack propagation simulation is still an open problem in the mechanical simulation field. In the present work this problem
is analyzed using a version of truss-like Discrete Element Method, that here we called DEM. This method has been used with
success in several applications in solid mechanical problems where the simulation of fracture and fragmentation is relevant.
The formulation of DEM explaining the way the process of rupture could be simulated in consistent form is showed. Also are
described details about how the dynamical fracto-mechanical stress intensity factors are computed. The main aim of this paper
is to show the ability of this method in simulating fracture and crack propagation in solids, for this, three examples with
different levels of complexity are analyzed. The obtained results are presented in terms of the variation of dynamic stress
intensity factor in the fracture process, the stress map and geometric configuration on different steps in the simulation
of the fracture process, the crack speed and the energetic balance during all the process. These results are compared with
experimental and numerical results obtained by other researchers and published in recognized scientific papers. Final commentaries
about the performance of the version of lattice model considered are carried out. 相似文献
24.
Pasqua DAmbra Marco Danelutto Daniela di Serafino Marco Lapegna 《Parallel Computing》2002,28(12):1637-1662
In this paper we provide a view of the design and development activity concerning advanced environments for parallel and distributed computing. We start from assessing the main issues driving this research track, in the areas of hardware and software technology and of applications. Then, we identify some key concepts, that can be considered as common guidelines and goals in the development of modern advanced environments, and we come up with a “classification” of these environments into two main classes: programming environments and problems solving environments. Both classes are widely discussed, in light of the key concepts previously outlined, and several examples are provided, in order to give a picture of the current status and trends. 相似文献
25.
Tramice A Arena A De Gregorio A Ottanà R Maccari R Pavone B Arena N Iannello D Vigorita MG Trincone A 《ChemMedChem》2008,3(9):1419-1426
The biological activities of a series of mono- and oligosaccharides (beta-xylosides and alpha-glucosides) of 9-fluorenylmethanol were investigated together with mono-beta-galactoside and beta-glucoside of this aglycone, produced by biocatalytic routes. By using marine glycoside hydrolases and inexpensive donors such as maltose or xylan, access to mono-alpha-glucoside or mono-beta-xyloside of 9-fluorenylmethanol was obtained. Additionally, interesting polyglycoside derivatives were isolated. Biological testing indicated that in vitro treatment with these carbohydrate derivatives may influence the balance of cytokines in the environment of human peripheral blood mononuclear cells (PBMC), restricting the harmful effect of herpes simplex type 2 replication. In fact, these carbohydrate derivatives tested in WISH cells did not show any significant antiviral activity. 相似文献
26.
Andrea Speltini Andrea Scalabrini Federica Maraschi Michela Sturini Ambra Pisanu Lorenzo Malavasi Antonella Profumo 《International Journal of Hydrogen Energy》2018,43(32):14925-14933
Chemically modified g-C3N4 for the photocatalytic H2 evolution from water was explored. Bulk g-C3N4 was treated in hot HNO3 aqueous solution to obtain the oxidized material (o-g-C3N4), tested in water containing glucose as model water-soluble sacrificial biomass, using Pt as co-catalyst, under simulated solar light. The behaviour of o-g-C3N4 was studied in relation with catalyst amount, Pt loading, glucose concentration. Results showed that H2 production is favoured by increasing glucose concentration up to 0.1 M and Pt loading up to 3 wt%, and it resulted strongly enhanced using small amount of o-g-C3N4 (0.25 g L?1). o-g-C3N4 possesses superior photocatalytic activity (~26-fold higher) compared to pristine g-C3N4, with H2 evolution further improved by ultrasound-assisted exfoliation and evolution rates up to ca. 1370 μmol h?1 per gram of catalyst, with excellent reproducibility (RSD < 6%, n = 3). Significant production was observed also in river water and seawater, with results far better (up to ca. 2500 μmol g?1 h?1) compared to commercial AEROXIDE® P25 TiO2 under natural solar light. 相似文献
27.
Call for papers papers on engineering of complex real-time computer control systems 相似文献
28.
Ambra Molesini Author Vitae Alessandro Garcia Author Vitae 《Journal of Systems and Software》2010,83(5):711-722
Design of stable software architectures has increasingly been a deep challenge to software developers due to the high volatility of their concerns and respective design decisions. Architecture stability is the ability of the high-level design units to sustain their modularity properties and not succumb to modifications. Architectural aspects are new modularity units aimed at improving design stability through the modularization of otherwise crosscutting concerns. However, there is no empirical knowledge about the positive and negative influences of aspectual decompositions on architecture stability. This paper presents an exploratory analysis of the influence exerted by aspect-oriented composition mechanisms in the stability of architectural modules addressing typical crosscutting concerns, such as error handling and security. Our investigation encompassed a comparative analysis of aspectual and non-aspectual decompositions based on different architectural styles applied to an evolving multi-agent software architecture. In particular, we assessed various facets of components’ and compositions’ stability through such alternative designs of the same multi-agent system using conventional quantitative indicators. We have also investigated the key characteristics of aspectual decompositions that led to (in)stabilities being observed in the target architectural options. The evaluation focused upon a number of architecturally-relevant changes that are typically performed through real-life maintenance tasks. 相似文献
29.
FRP Confinement of Tuff and Clay Brick Columns: Experimental Study and Assessment of Analytical Models 总被引:3,自引:0,他引:3
Marco Di Ludovico Claudio D’Ambra Andrea Prota Gaetano Manfredi 《Canadian Metallurgical Quarterly》2010,14(5):583-596
In recent years, fiber-reinforced polymer (FRP) wrapping effectiveness has been clearly confirmed especially with reference to concrete structures. Despite evident advantages of FRP based confinement on members subjected to compressive overloads due to static or seismic actions, the use of such technique in the field of masonry has not been fully explored. Thus, to assess the potential of confinement of masonry columns, the present paper shows the results of an experimental program dealing with 18 square cross sections (listed faced tuff or clay brick) masonry scaled columns subjected to uniaxial compression load. In particular, three different confinement solutions have been experimentally analyzed in order to evaluate and compare the effectiveness of uniaxial glass FRP, carbon FRP, and basalt FRP laminates wrapping. The main experimental outcomes are presented and discussed in the paper considering mechanical behavior of specimens, axial stress-axial strain relationships, and effective strains at failure on the reinforcement. Test results have showed that the investigated confining systems are able to provide significant gains both in terms of compressive strength and ductility of masonry columns. Results of the presented experimental activity along with data available in the literature have been finally used to assess the reliability of the main existing analytical models; refined equations have been then proposed to minimize the scattering between theoretical predictions and experimental available data. 相似文献
30.
Alexandra Barau Vitaly Budarin Agneta Caragheorgheopol Rafael Luque Duncan J. Macquarrie Ambra Prelle Valentin S. Teodorescu Maria Zaharescu 《Catalysis Letters》2008,124(3-4):204-214
Various mesoporous silica supported Pd materials were prepared by different methodologies in order to control and optimize the metal nanoparticle sizes for catalytic applications. The catalytic activities (conversion, mol% and selectivity to methyl-cinnamate) of the supported palladium catalysts were investigated in the Heck reaction under microwave irradiation using various haloarenes. Pd materials prepared by co-precipitation exhibited a very poor activity in the Heck reaction compared to that of Pd impregnated samples. Impregnated materials prepared without the use of a specific reducing agent had comparable activities to those of APTS-NaBH4 reduced Pd materials, validating the simplicity of the methodology. High selectivities to methylcinnamate were obtained for all materials. 相似文献