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排序方式: 共有48条查询结果,搜索用时 15 毫秒
1.
David W. Binkley Sebastian Danicic Mark Harman John Howroyd Lahcen Ouarbya 《Formal Aspects of Computing》2006,18(2):103-119
A formal relationship between program slicing and partial evaluation is established. It is proved that for terminating programs,
a residual program produced by partial evaluation is semantically equivalent to a conditioned slice.
Received May 2002
Revised Octber 2004 and July 2005
Accepted August 2005 by D. J. Cooke 相似文献
2.
Abdellah Benzaouia Ouassima Akhrif Lahcen Saydy 《International journal of systems science》2013,44(4):397-409
This article presents sufficient conditions for the stabilisation of switching discrete-time linear systems subject to actuator saturations. These conditions are obtained by using successively state and output feedback control laws. The obtained results are formulated in terms of linear matrix inequalities (LMIs). The saturating and non-saturating controllers are synthesised for both cases in this work. Three sets of LMIs are presented for output feedback case. Numerical examples are used to illustrate these techniques by using a linear optimisation problem subject to LMI constraints. 相似文献
3.
The microstructure of a heterogeneous SiO2 submitted to a depolymerisation process is studied using Transmission Electron Microscope (TEM), Environmental SEM (ESEM), and X-ray diffraction (XRD). With ESEM the formation of micro domain induced by the dissolution phenomena is shown. XRD shows the formation of a halo that is associated with the formation of amorphous phase. The parameters “position and FWHM” of the halo, enabled us to show the evolution of the disorderly phase when the reaction progresses. The hypothesis of formation of nanoparticles with different structural states was confirmed by the TEM. 相似文献
4.
Touriya Bassidi Mountassir Lahcen Banouni Hicham Nounah Hassan Bouabid Khalid 《Russian Journal of Nondestructive Testing》2020,56(12):1005-1017
Russian Journal of Nondestructive Testing - Ultrasonic measurements were used to characterize the setting process of glass-ionomer dental cement (GIC) and to evaluate the effect of temperature on... 相似文献
5.
Brahim Ben Kabbour Lahcen Zouhri Jacky Mania Jean-Pierre Colbeaux 《Bulletin of Engineering Geology and the Environment》2006,65(4):463-470
In this study, the DASTI method was used to evaluate vulnerability to groundwater pollution in the vicinity of Rabat, western
Morocco. The model is based on the characterization of five intrinsic parameters: unsaturated zone thickness, saturated zone
thickness and lithology, soil texture, topography and hydraulic gradient. A system of classes of the hydrogeological characteristics
was applied to evaluate relative vulnerability to groundwater contamination and a susceptibility map was prepared based on
land use and the vulnerability index map. The study showed the DASTI method (applied using IDRISI software) can serve as a
tool to evaluate vulnerability to pollution and thus facilitate programs to protect groundwater resources.
An erratum to this article can be found at 相似文献
6.
Rob Hierons Mark Harman Chris Fox Lahcen Ouarbya Mohammed Daoudi 《Software Testing, Verification and Reliability》2002,12(1):23-28
This paper describes the use of conditioned slicing to assist partition testing, illustrating this with a case study. The paper shows how a conditioned slicing tool can be used to provide confidence in the uniformity hypothesis for correct programs, to aid fault detection in incorrect programs and to highlight special cases. Copyright © 2001 John Wiley & Sons, Ltd 相似文献
7.
Electrical and Seismic Tomography Used to Image the Structure of a Tailings Pond at the Abandoned Kettara Mine, Morocco 总被引:1,自引:1,他引:0
Meriem Lghoul Teresa Teixidó José Antonio Pe?a Rachid Hakkou Azzouz Kchikach Roger Guérin Mohammed Jaffal Lahcen Zouhri 《Mine Water and the Environment》2012,31(1):53-61
The Kettara site (Morocco) is an abandoned pyrrhotite ore mine in a semi-arid environment. The site contains more than 3 million tons of mine waste that were deposited on the surface without concern for environmental consequences. Tailings were stockpiled in a pond, in a dyke, and in piles over an area of approximately 16?ha and have generated acid mine drainage (AMD) for more than 29?years. Geophysical methods have been used at the Kettara mine site to determine the nature of the geological substrate of the tailings pond, the internal structure of the mine wastes, and to investigate the pollution zones associated with sulphide waste dumps. Electrical resistivity tomography (ERT) and seismic refraction data were acquired, processed, and interpreted; the results from ERT and seismic refraction were complementary. A topographical survey of the tailings disposal area was also undertaken to estimate the volume of wastes and quantify the AMD process. Two-dimensional inverse models were used to investigate the geophysical data and indicated alteration zones at depth. It was determined that the material could be classified into three categories: tailings, with low resistivity (5?C15??? m) and low velocity (500?C1,800?m/s); altered, black shales, with intermediate resistivity (20?C60??? m) and velocity (2,000?C3,500?m/s), and; materials with high resistivity and velocity (>60????m and >4,000?m/s, respectively), including unaltered shales associated with quartzite seams. The low-resistivity zone generates AMD, which migrates downward through fractures and micro-fractures. The substrate is composed of broken and altered shale, which facilitates AMD infiltration. 相似文献
8.
The interaction of surface radiation with laminar and turbulent natural convection in differentially heated vertical cavities, filled with air and of large aspect ratio (greater than 10), is analyzed in this study. The k ? ωSST turbulence model is used for the formulation of the convection fluid flow and heat transfer, while the governing equations are discretized by the finite-volume method. As an extension of the scarce previous studies, more realistic conditions with a wide range of parameters are considered in the performed simulations. The presented results show the effect of surface radiation on streamlines, isotherms, turbulent kinetic energy, and temperature and vertical velocity profiles, as well as on local and on average convective and radiative heat transfer. Globally, it is found that surface radiation has a weak effect on the dynamic and thermal fields in the major part of the cavity; however, some influence in the upper and lower zones of the cavity is observed. For design purposes, accurate correlations are developed for average convective and radiative Nusselt numbers that cover emissivity of surfaces between 0 and 1, cold wall temperature ranging from 263 K to 303 K, temperature difference between vertical walls ranging from 5 K to 40 K, width of the cavity between 2.5 cm and 7.5 cm, and height of the cavity between 0.25 m and 6 m (this leads to a Rayleigh number ranging from 103 to 2 × 106 and an aspect ratio between 10 and 80). 相似文献
9.
Groundwater interaction in the coastal environment: hydrochemical,electrical and seismic approaches 总被引:1,自引:0,他引:1
Lahcen Zouhri Erick Carlier Brahim Ben Kabbour El Arbi Toto Christian Gorini Barbara Louche 《Bulletin of Engineering Geology and the Environment》2008,67(1):123-128
The heterogeneous Plio-Quaternary coastal aquifer of the Mamora Basin is the most significant reservoir of Morocco. It is
composed of sandstones, conglomerates, limestones and more or less argillaceous sands. The increase in the requirements for
water in this area requires further information on the relations between the geometry of the aquifer and the salinity of the
water. A hydrochemical analysis was undertaken and highlighted three zones of high mineralization. A geophysical approach
allowed the determination of the principal aquifer levels, the localization of the various types of water (fresh, brackish
and salt) and the geometry of the aquifer base. The results obtained by these two approaches provide a better image of the
phenomena governing the groundwater flows and their interactions
相似文献
10.
Mountassir Lahcen Bassidi Touriya Nounah Hassan 《Russian Journal of Nondestructive Testing》2021,57(7):525-540
Russian Journal of Nondestructive Testing - The bones elastic characterization using the nondestructive technique based on the propagation of the ultrasonic waves well studied in this paper. The... 相似文献