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排序方式: 共有66条查询结果,搜索用时 15 毫秒
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Mokhtar Guissous Yveline Le Dréau Hasna Boulkhroune Toufik Madani Jacques Artaud 《Journal of the American Oil Chemists' Society》2018,95(3):267-281
Differences in triacylglycerol, fatty acid, squalene, and tocopherol compositions were demonstrated between 8 varieties of virgin olive oils (Aberkane, Aguenaou, Aharoun, Aimel, Bouchouk Guergour, Bouichret, Chemlal, and Sigoise) from Petite Kabylie area, north eastern Algeria. Fatty acid and triacylglycerol morphotypes characterized each variety. A principal component analysis, based on triacylglycerol, fatty acid, and squalene compositions, differentiates between varieties. Minor fatty acids and squalene, usually not taken into account individually in authentication studies, are strongly involved in this differentiation, whereas the discriminant power of tocopherols is weak. Soft Independent Modeling of Class Analogy classification using chemical compositions as variables showed a high potential to authenticate the varietal origin of Algerian virgin olive oils. 相似文献
3.
Toufik Sadi Robert W. Kelsall Neil J. Pilgrim 《Journal of Computational Electronics》2007,6(1-3):35-39
We present results from the simulation of the electrothermal behaviour of submicron wurtzite GaN/AlGaN High Electron Mobility
Transistors (HEMTs). The simulator uses an iterative procedure which couples a Monte Carlo simulation with a fast Fourier
series solution of the Heat Diffusion Equation (HDE). The results demonstrate the dependence of the extent of the thermal
droop observed in the Ids-Vds characteristics and the device peak temperature on the device bias. The paper also investigates the effect of the inclusion
of thermal self-consistency on the device microscopic properties and studies the dependence of the device electrothermal characteristics
on the type of substrate material used. 相似文献
4.
Toufik Chergui Salah Larbi Amor Bouhdjar 《Renewable & Sustainable Energy Reviews》2010,14(5):1410-1418
The purpose of the work presented in this study is related to heat transfer and airflow modelling analysis in solar chimneys, according to some dominant parameters. A typical case of application is given in this study. It consists in analyzing a natural laminar convective heat transfer problem taking place in a chimney. Heat transfer and fluid dynamic aspects of the airflow, through an axis symmetric system in a dimensionless form, with well defined boundary conditions is thus examined. Results are related to the temperature distribution and the velocity field in the chimney and in the collector, determined by solving the energy equation, and the Navier–Stokes equations, using finite volume method. The numerical code based on this modelling is validated through the Vahl Davis benchmark solution for natural convection and to other authors for other cases. 相似文献
5.
Rizwan Ul Haq Zakia Hamouch S.T. Hussain Toufik Mekkaoui 《International Journal of Hydrogen Energy》2017,42(24):15925-15932
Main objective of this frame work is to establish the modeling and simulation of mix convection flow along a vertically heated sheet filled with water. Two important mechanisms: magneto-hydrodynamics and porous medium are also considered within the restricted domain of the fluid flow. Temperature is controlled with the wall temperature and then mathematical model is constructed in the form of PDEs. To determine the similarity solution results are obtained via two different techniques. Numerically solutions are obtained with the help of shooting technique and then validate with the help of optimal homotopy analysis method (OHAM). Obtained analytical and numerical results are validated graphically. Effect of emerging parameters are plotted for velocity and temperature profiles. It is found that for mixed convection parameter velocity profile depicts the increasing behavior for various values of power index m. However, for velocity profile shows the decreasing behavior with respect the parameter m. Temperature distribution in the restricted domain depicts the decreasing behavior for both m and . 相似文献
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Philippe Stempflé Toufik Djilali Richard Kouitat Njiwa Marthe Rousseau Evelyne Lopez Xavier Bourrat 《Tribology Letters》2009,35(2):97-104
Sheet nacre is a natural biocomposite with a multiscale structure including a mineral phase of calcium carbonate (97 wt.%)
and two organic matrices (3 wt.%). The mineral phase is constituted by an arrangement of CaCO3 biocrystal nanograins (ca 40 nm in size) drowned in an “intracrystalline” organic matrix (4 nm thick) in order to form a
microsized flat organomineral aragonite platelet. These platelets are themselves surrounded by an “intercrystalline” organic
matrix (40 nm thick) building up a very tough materials. This microarchitecture referred to as “bricks and mortar” nacre structure,
is mainly studied for the creation of new organic/inorganic hybrid materials. Currently, only little is known about the nacre
mechanical behaviour under dynamical loading and more particularly under tribological conditions which involve shocks and
thermal effects simultaneously. This paper brings out the thermal-induced damage mechanisms effect on the wear of sheet nacre
by the assessment of the thermal component of the friction with a scanning thermal microscope. Results reveal that the mean
contact pressure is the main driving force involved in the degradation of the organic constituents. For the lowest mean contact
pressure (<0.4 MPa), wear is rather weak because the friction-induced thermal component is not sufficient for degrading the
organic matrices. In contrast, beyond 0.4 MPa, the friction-induced contact temperature rises up over the melting point of
the organic matrices, and may even reach the temperature of the aragonite–calcite phase transformation increasing dramatically
the wear of sheet nacre. 相似文献
8.
Toufik Boubekeur Karim Ezziane El-Hadj Kadri 《Journal of Adhesion Science and Technology》2013,27(24):2741-2756
The study of the hydration kinetics appears as a prerequisite for understanding the physical and mechanical phenomena that control the behavior of cementitious materials. This research is based on monitoring the evolution of the degree of hydration for ordinary cement and those containing 10% of limestone powder, 20% of natural pozzolana or 30% of the blast furnace slag under high temperatures. The results provide a better understanding the effect of cure temperature on the hydration kinetics and understand the contribution of mineral additions on improving the cement properties. A new model proposed gives the satisfaction results for predicting in later age the heat of hydration of cements blended kept under constant temperatures. The latter has a wider appreciation of the results, where it gives correlation coefficients very close of unity. This justifies the reliability of this new model proposed. 相似文献
9.
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
10.
Toufik Sadi Robert W. Kelsall Neil J. Pilgrim 《Electron Devices, IEEE Transactions on》2007,54(2):332-339
In this paper, we present results from the simulation of submicrometer Si/SiGe modulation-doped field-effect transistors (MODFETs) using an electrothermal Monte Carlo method. The relationships between the thermal droop effect observed in the electrothermal Id -Vds characteristics of the devices and the microscopic properties of electron transport and the temperature profiles are studied. The effects of varying the effective semiconductor die dimensions and the thickness of the SiGe buffers on the electrothermal behavior of the devices are also investigated. A comparison of the electrothermal performance of the simulated Si/SiGe MODFET with that of a GaAs-based HEMT is also carried out 相似文献