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11.
The declination of the dependability requirements of the complex systems is one of the most critical processes of systems conception as well as systems engineering. We consider that these dependability requirements must be globally considered at the complete system level if they are to be respected before being allocated on the components of the system. Our approach is based on a three-dimensional decomposition model of the system whose purpose is to describe the way in which the system operates in order to deduce its dysfunction that serves as a basic support for the declination of the dependability requirements. The proposed method is applied to a nitric acid cooling system before being introduced into a chemical reactor. 相似文献
12.
P. Vicente A. Raymond M. Kamal Saadi B. Couzinet M. Kubisa W. Zawadzki B. Etienne 《Solid-state electronics》1996,40(1-8):109-112
Interband photoluminescence from asymmetric modulation-doped GaAs---GaAlAs quantum wells in the presence of a magnetic field has been investigated. The free-carrier Landau level excitations as well as transitions between magneto-donor and free hole states have been observed. Experiments with tilted magnetic field provide strong evidence for the existence of conduction electrons bound to ionized magneto-acceptors, characterized by discrete energies above the conduction band Landau levels. The observations are compared with the theory. 相似文献
13.
Asbjørn Klerke Souheil Saadi Maja Bøg Toftegaard Anders Theilgaard Madsen Jane H. Nielsen Søren Jensen Ole Hansen Claus Hviid Christensen Ulrich J. Quaade 《Catalysis Letters》2006,109(1-2):7-12
The catalytic activity of PtRu colloid nanoparticles for CO oxidation is investigated in microfabricated reactors. The measured
catalytic performance describes a volcano curve as a function of the Pt/Ru ratio. The apparent activation energies for the
different alloy catalysts are between 21 and 117 kJ/mol, which agree well with literature. The size distribution of the colloid
nanoparticles is determined from STM and TEM, from which an average size of the colloid nanoparticles of 2.2±0.5 nm is determined. 相似文献
14.
César Augusto Aguirre ;Guillermo Jorge Berri ;Armando Benito Brizuela ;Emiliana Elisabet Orcellet 《机械工程与自动化:英文版》2014,(11):887-899
This work shows the comparison between the results of wind and temperature simulation and data weather measurements in low layers near Gualeguaychfi City, Argentine, for 12 h in January 1, 2011. The model ARPS (advanced regional prediction system) with two options in the boundary conditions is used. In such conditions, wave-radiating open (radiative) with relaxation to the initial state were used while otherwise used absorbing boundary conditions data forced from MBLM (meso-scale boundary layer model) operational forecasters used by the National Weather Office. The results of both simulations are compared with data measured by three weather stations located around of the Uruguay River. As both simulations are initialized using the same data, there is a better agreement between the values obtained by forcing the boundary conditions for which are using "radiative" boundary conditions after 2 h physical time from the start of the simulation. 相似文献
15.
Photocatalytic hydrogen evolution over CuCrO2 总被引:1,自引:0,他引:1
We have been studying the technical feasibility of a photochemical H2 evolution based on a dispersion of CuCrO2 powder in aqueous electrolytes containing various reducing agents (S2−, and ). The title oxide combines a fair resistance to corrosion with an optimal band gap Eg of 1.32 eV. The intercalation of a small amount of oxygen should be accompanied by a partial oxidation of Cu+ into Cu2+ implying a p-type semiconductivity. The S2− oxidation inhibits the photocorrosion and the H2 evolution increases parallel to polysulfides formation. Most of H2 is produced when p-CuCrO2 is connected to n-Cu2O formed in situ. H2 liberation proceeds mostly on CuCrO2 while the oxidation of S2− takes place over Cu2O surface and the hetero system Cu2O/CuCrO2 is optimized with respect to some physical parameters. The photoactivity is dependent on preparation conditions and lowering the synthesis temperature through nitrate route leads to an increase in specific surface area Ssp. The photoelectrochemical H2 production is a multistep process where the rate determining step is the arrival of electrons at the interface because of their low mobility. Prolonged irradiation (>80 min) leads to a pronounced decrease of the photoactivity; the tendency toward saturation is due to the undesired back reduction of polysulfides in a closed system and to their strong absorption in the visible region (λmax = 520 nm). 相似文献
16.
Amir Parnianifard Muhammad Saadi Manus Pengnoo Muhammad Ali Imran Sattam Al Otaibi Pruk Sasithong Pisit Vanichchanunt Tuchsanai Polysuwan Lunchakorn Wuttisittikulkij 《计算机、材料和连续体(英文)》2021,68(1):569-587
With every passing day, the demand for data traffic is increasing, and this urges the research community not only to look for an alternating spectrum for communication but also urges radio frequency planners to use the existing spectrum efficiently. Cell sizes are shrinking with every upcoming communication generation, which makes base station placement planning even more complex and cumbersome. In order to make the next-generation cost-effective, it is important to design a network in such a way that it utilizes the minimum number of base stations while ensuring seamless coverage and quality of service. This paper aims at the development of a new simulation-based optimization approach using a hybrid metaheuristic and metamodel applied in a novel mathematical formulation of the multi-transmitter placement planning (MTPP) problem. We first develop a new mathematical programming model for MTPP that is flexible to design the locations for any number of transmitters. To solve this constrained optimization problem, we propose a hybrid approach using the radial basis function (RBF) metamodel to assist the particle swarm optimizer (PSO) by mitigating the associated computational burden of the optimization procedure. We evaluate the effectiveness and applicability of the proposed algorithm by simulating the MTPP model with two, three, four and five transmitters and estimating the Pareto front for optimal locations of transmitters. The quantitative results show that almost maximum signal coverage can be obtained with four transmitters; thus, it is not a wise idea to use higher number of transmitters in the model. Furthermore, the limitations and future works are discussed. 相似文献
17.
Hamid Mohamadi Jafar Habibi Mohammad Saniee Abadeh Hamid Saadi 《Pattern recognition》2008,41(5):1824-1833
In this paper, the use of simulated annealing (SA) metaheuristic for constructing a fuzzy classification system is presented. In several previous investigations, the capability of fuzzy systems to solve different kinds of problems has been demonstrated. Simulated annealing based fuzzy classification system (SAFCS), hybridizes the learning capability of SA metaheuristic with the approximate reasoning method of fuzzy systems. The objective of this paper is to illustrate the ability of SA to develop an accurate fuzzy classifier. The use of SA in classification is an attempt to effectively explore and exploit the large search space usually associated with classification problems, and find the optimum set of fuzzy if–then rules. The SAFCS would be capable to extract accurate fuzzy classification rules from input data sets, and applies them to classify new data instances in different predefined groups or classes. Experiments are performed with eight UCI data sets. The results indicate that the proposed SAFCS achieves competitive results in comparison with several well-known classification algorithms. 相似文献
18.
Mhand Hifi Stephane NegreRachid Ouafi Toufik Saadi 《Computers & Industrial Engineering》2012,62(1):177-189
In this paper, we solve the two-staged two-dimensional cutting problem using a parallel algorithm. The proposed approach combines two main features: beam search (BS) and strip generation solution procedures (SGSP). BS employs a truncated tree-search, where a selected subset of generated nodes are retuned for further search. SGSP, a constructive procedure, combines a (sub)set of strips for providing both partial lower and complementary upper bounds. The algorithm explores in parallel a subset of selected nodes following the master-slave paradigm. The master processor serves to guide the search-resolution and each slave processor develops its proper way, trying a global convergence. The aim of such an approach is to show how the parallelism is able to efficiently solve large-scale instances, by providing new solutions within a consistently reduced runtime. Extensive computational testing on instances, taken from the literature, shows the effectiveness of the proposed approach. 相似文献
19.
Integration of DEM, ETM+, Geologic, and Magnetic Data for Geological Investigations in the Jifara Plain, Libya 总被引:1,自引:0,他引:1
Saadi N.M. Aboud E. Watanabe K. 《Geoscience and Remote Sensing, IEEE Transactions on》2009,47(10):3389-3398
We used an integrated approach to constrain the geological structure of the Jifara Plain in northwest Libya. The analysis of surface data, including a digital elevation model (DEM), Landsat Enhanced Thematic Mapper Plus images, and geologic maps, was combined with subsurface data, including well logs and magnetic data. The DEM data were used for the identification of geological lineaments in the study area. The interpretation and analysis of the lineaments indicate that the Jifara Plain is controlled by three main fault systems, trending northwest-southeast, east-west, and northeast-southwest. The three trends represent the remnants of reactivated structures that formed under the stress regimes generated during the tectonic evolution of North Africa. The magnetic data reveal three northwest- and northeast-trending sedimentary basins in the study area. The depth of the basement inside the main basin ranges from 1 to 5 km. The results indicate that the Jifara Basin is shallower than the surrounding basins. The integration of the results reflects different periods of tectonic activity in the Jifara Plain and the adjacent Jabal Nafusah. 相似文献
20.