نتایج جستجو برای: show that firstly
تعداد نتایج: 6580073 فیلتر نتایج به سال:
In this work firstly ZnO nanoparticles were synthesized via a simple precipitation method. At the second step titanium dioxide and silicon dioxide shell were synthesized on the core. For preparation ZnO-TiO2-SiO2 the sol product was calcinated at 500 ºC for 2h. Properties of the product were examined by X-raydiffraction pattern (XRD), scanning electron microscope (SEM) and Fourier transform inf...
In this paper, our purpose is twofold. Firstly, the tensor andresiduum operations on $L-$nested systems are introduced under thecondition of complete residuated lattice. Then we show that$L-$nested systems form a complete residuated lattice, which isprecisely the classical isomorphic object of complete residuatedpower set lattice. Thus the new representation theorem of$L-$subsets on complete re...
This paper presents a modified digital image watermarking method based on nonnegative matrix factorization. Firstly, host image is factorized to the product of three nonnegative matrices. Then, the centric matrix is transferred to discrete cosine transform domain. Watermark is embedded in low frequency band of this matrix and next, the reverse of the transform is computed. Finally, watermarked ...
Pressure control valve (PCV) is implemented in internal combustion engine to regulate crankcase pressure. In this study, the performance of a diaphragm PCV valve is investigated numerically and experimentally. Firstly, numerical simulation is carried out using commercial code to predict the flow and pressure distribution inside the valve. Furthermore, downstream and upstream pressure of the val...
Résumé. La finalité de ce papier est d'analyser l'apport de techniques de fouille de données textuelles à une méthodologie de construction d'ontologie à partir de textes. Le domaine d’application de cette expérimentation est celui de l’accidentologie routière. Dans ce contexte, les résultats des techniques de fouille de données textuelles sont utilisés pour orienter la construction d’une ressou...
the aim of this study is investigating the effect of teaching “metacognitive strategies” on the way which scientific information retrieval workes by the using of google scholar searching machine on the students of ms in the psycology & education faculty of allameh tabatabayi university in 2007-2008 academic year. the statistical community was the students of ms in psychology & education facult...
abstract: research purpose: the purpose of this research is to identify academic databases assessment factors and criteria at law and political science majors. the necessity of this research is to distinguish academic databases assessment factors and criteria and to identify the most important ones and rank them in order to select an appropriate database according to students’ and faculty memb...
periodic noises are unwished and spurious signals that create repetitive pattern on images and decreased the visual quality. firstly, this paper investigates various methods for reducing the effects of the periodic noise in digital images. then an adaptive optimum notch filter is proposed. in the proposed method, the regions of noise frequencies are determined by analyzing the spectral of noisy...
RÉSUMÉ. Le déploiement est maintenant considéré comme une activité à part entière du cycle de vie du logiciel. Les grandes entreprises souhaitent pouvoir automatiser cette étape tout en prenant en compte les caractéristiques de chaque machine cible. Pour répondre à ces besoins, nous avons défini un environnement de déploiement : ORYA (Open enviRonment to deploY Applications). Cet environnement ...
RÉSUMÉ. Dans plusieurs domaines comme l’aéronautique, l’outillage et l’automobile, l’usinage des pièces se fait de plus en plus sur des centres d’usinage à grande vitesse. Aujourd’hui, l’offre pour l’achat de ces centres d’usinage est très étendue. Cette situation pose le problème du choix judicieux et objectif répondant aux besoins industriels qu’il faut bien exprimer. Le choix reste difficile...
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