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11.
Multimedia Tools and Applications - In modern life, the massive number of vehicles makes it hard for a human being to process its related information. So, it is important to build an automatic... 相似文献
12.
This paper is focusing on the numerical simulation of a swirling flame, resulting from the interaction of multiple fires, evolving in a free and unlimited environment. A typical system, formed by a central fire source surrounded by four heat sources, is used. Since the thermal characteristic of the surrounding sources is the main engine for the rotation of flame, a detailed study is performed by varying the heating flux of these sources. This study shows that an increase of the heating flux of surrounding sources has as a result an intensification of the penetrating air puffs through the openings between the surrounding four heat sources. These puffs tangentially drive the central flame, thus producing a marked improvement on the angular momentum. Moreover, this study shows that the flame height is strongly affected by the flame rotation. Moreover, two different aspects of the flame height evolution are observed from the flow visualization and the thermal and dynamic fields for the different cases studied. 相似文献
13.
Anoire Ben Jdidia Alain Bellacicco Taissir Hentati Maher Barkallah Mohamed Taoufik Khabou Alain Rivier 《中国工程学刊》2019,42(5):377-384
The accurate evaluation of electrical energy demanded by a CNC toolpath during a machining process is essential to determine its efficiency. Actually, the dynamic behavior of cutting forces seems to be neglected by investigators despite its influence on the consumed cutting energy during a face milling operation. This paper aims to investigate the effect of dynamic behavior of the machining system in order to take into account the dynamic response of the cutting forces on the axis feed power prediction. A dynamic cutting power model is developed in order to predict the consumed cutting energy. A parametric study is performed in order to show the impact of cutting conditions on the consumed energy values. The numerical results are compared to experimental ones. 相似文献
14.
Taoufik Saidani Mohamed Atri Lazhar Khriji Rached Tourki 《Journal of Real-Time Image Processing》2016,11(1):63-74
With the augmentation in multimedia technology, demand for high-speed real-time image compression systems has also increased. JPEG 2000 still image compression standard is developed to accommodate such application requirements. Embedded block coding with optimal truncation (EBCOT) is an essential and computationally very demanding part of the compression process of JPEG 2000 image compression standard. Various applications, such as satellite imagery, medical imaging, digital cinema, and others, require high speed and performance EBCOT architecture. In JPEG 2000 standard, the context formation block of EBCOT tier-1 contains high complexity computation and also becomes the bottleneck in this system. In this paper, we propose a fast and efficient VLSI hardware architecture design of context formation for EBCOT tier-1. A high-speed parallel bit-plane coding (BPC) hardware architecture for the EBCOT module in JPEG 2000 is proposed and implemented. Experimental results show that our design outperforms well-known techniques with respect to the processing time. It can reach 70 % reduction when compared to bit plane sequential processing. 相似文献
15.
Mostafa Taoufik Erwan Le Roux Jean Thivolle-Cazat Christophe Copéret Jean-Marie Basset Barry Maunders Glenn J. Sunley 《Topics in Catalysis》2006,40(1-4):65-70
Silica and alumina supported tantalum and tungsten hydrides were tested in alkane metathesis, for comparison of their catalytic
properties. In propane metathesis [W]–H/Al2O3 proves to be twice more efficient than the usual [Ta]–H/SiO2 catalyst which is still better than [Ta]–H/Al2O3 and [W]–H/SiO2. Tungsten based catalysts lead to a narrower distribution in the products selectivity and to a higher amount of linear products
than [Ta]–H/SiO2. [W]–H/Al2O3 is also a better catalyst than [Ta]–H/SiO2 for butane metathesis but is less efficient with ethane. Whereas the results in the case of propane or butane can involve
the higher initial activity and a lower deactivation of the tungsten catalyst, in the case of ethane, mechanistic or kinetic
aspects can be envisaged in particular concerning the difficulty to dehydrogenate ethane into ethylene. 相似文献
16.
Lassâad Walha Yassine DrissMohamed Taoufik Khabou Tahar FakhfakhMohamed Haddar 《Mechanism and Machine Theory》2011,46(7):986-997
This paper investigates the nonlinear dynamic behavior of an automotive clutch coupled with a helical two stage gear system. The nonlinear dynamic model is simulated by twenty seven degrees of freedom and including three types of nonlinearity: dry friction path, double stage stiffness and spline clearance. The utility of the proposed nonlinear model is illustrated by the industrial need to clearly identify the dynamic behavior of mechanical elements (shafts, bearings, gears, flywheel, pressure plate, hub of the clutch…) and reduce vibration. The governing nonlinear time varying motion equation formulated is resolved by the analytic Runge Kutta method.Then the modeling of the eccentricity defect located on the gear and the flywheel of the clutch is done. The effect of this defect on the nonlinear dynamic behavior of the system is investigated. 相似文献
17.
18.
Taoufik Bouezmarni Jeroen V.K. Rombouts 《Computational statistics & data analysis》2010,54(2):245-261
The Gaussian kernel density estimator is known to have substantial problems for bounded random variables with high density at the boundaries. For independent and identically distributed data, several solutions have been put forward to solve this boundary problem. In this paper, we propose the gamma kernel estimator as a density estimator for positive time series data from a stationary α-mixing process. We derive the mean (integrated) squared error and asymptotic normality. In a Monte Carlo simulation, we generate data from an autoregressive conditional duration model and a stochastic volatility model. We study the local and global behavior of the estimator and we find that the gamma kernel estimator outperforms the local linear density estimator and the Gaussian kernel estimator based on log-transformed data. We also illustrate the good performance of the h-block cross-validation method as a bandwidth selection procedure. An application to data from financial transaction durations and realized volatility is provided. 相似文献
19.
Hedi Sakli Hafedh Benzina Taoufik Aguili Jun Wu Tao 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(8):877-883
This paper is an analysis of rectangular waveguide completely full of ferrite magnetized longitudinally. The analysis is based
on the formulation of the transverse operator method (TOM), followed by the application of the Galerkin method. We obtain
an eigenvalue equation system. The propagation constant of some homogenous and anisotropic waveguide structures with ferrite
has been obtained. The results presented here show that the transverse operator formulation is not only an elegant theoretical
form, but also a powerful and efficient analysis method, it is useful to solve a number of the propagation problems in electromagnetic.
One advantage of this method is that it presents a fast convergence. Numerical examples are given for different cases and
compared with the published results. A good agreement is obtained. 相似文献
20.