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The Effect of Chitosan on Hydroxyapatite Precipitation
Hatim Zineb,Bakasse Mina,Kheribech Abdelmoula,Abida Fatima,Bourouisse Abderrahim 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The process of coprecipitation of biocomposite hydroxyapatite/chitosan from aqueous solution at low temperature in alkali environnement was examined. We have shown that initially we have the formation of amorphous octocalcium phosphates and the transferring from OCP to amorphous calcium phosphate , and then from TCP to calcium-deficient hydroxyapatite and hydroxyapatite . The transformation of ACP to HAP was inhibited in the presence of chitosan. The result suggests that there is an affinity binding between ACP and chitosan and subsequently blocking the active growth site of ACP.
Hatim Machrafi 한국물리학회 2017 Current Applied Physics Vol.17 No.6
A new analytical mathematical model is developed, describing a cooled photovoltaic-thermoelectric hybrid system. The thermoelectric material is a nanocomposite where the model takes into account size-dependent non-local thermoelectric properties from an extended thermodynamic point of view. The photovoltaic device powers also the cooling system. The model determines first the optimum thickness of the photovoltaic device, then studies the influence of several size-related parameters on the thermoelectric efficiency (also related to the figure of merit) and finally, coupled to a cooling device, the overall efficiency. For the photovoltaic part, the model is applied to two materials, mono-crystalline and poly-crystalline silicon. The thermoelectric part of the model is applied to an n-leg nanocomposite made out of Sb2Te3 nanoparticles in a Bi2Te3 matrix and of a p-leg nanocomposite made out of Bi2Se3 nanoparticles in a Bi2Te3 matrix. An optimal total photovoltaic device size has been found to be around 127 mm and 1.25 mm for the mono- and poly-crystalline silicon, respectively, leading to efficiencies up to 20%, depending on photovoltaic recombination characteristics. With the cooling device, the overall efficiency was increased by up to an additional 10% (an increase of almost 50%), leading to overall efficiencies around 25%.
Relevance as Effort and Reward: A translation & interpreting perspective
( Basil Hatim ) 한국통역번역학회 2006 FORUM Vol.4 No.2
L`objectif general de ce propos est de demontrer la valeur pratique de sensibiliser les traducteurs et les interpretes a la notion de ? pragmatique ?. La Pragmatique est definie en tant que l`echange langagier effectif avec les ? objectifs ? pour lesquels le texte ou l`enonce ont ete utilises. Le present propos met l`accent sur le role precis de la ? pertinence ? dans la production et la reception d`un texte. La pertinence est une notion pragmatique en rapport avec la communication basee sur le principe de ? l`effort et la recompense ? ou en d`autres termes le fait d`atteindre le maximum d`effet avec le minimum d`effort. L`analyse d`une variete d`exemples de textes d`appui en Arabe et en Anglais permettrait de conclure que la competence pragmatique est un element principal dans l`operation de traduction et d`interpretation.
ESSENTIAL SPECTRUM OF A WEIGHTED GEOMETRIC REALIZATION
Khalid Hatim,Azeddine Baalal 경남대학교 수학교육과 2021 Nonlinear Functional Analysis and Applications Vol.26 No.4
In this present article, we construct a new framework that's we call the weighted\textbf{\ }%geometric realization of $2$ and $3$-simplexes. On this new weightedframework, we construct a nonself-adjoint $2$-simplex Laplacian $L$ and a self-adjoint $2$-simplex Laplacian $N$. We propose general conditions toensure sectoriality for our new nonself-adjoint $2$-simplex Laplacian $L$. We show the relation between the essential spectra of $L$ and $N$. Finally, we prove the absence of the essential spectrum for our $2$-simplexLaplacians $L$ and $N$.
Harianawala, Husain Hatim,Kheur, Mohit Gurunath,Apte, Sanjay Krishnaji,Kale, Bharat Bhanudas,Sethi, Tania Sanjeev,Kheur, Supriya Mohit The Korean Academy of Prosthodonitics 2014 The Journal of Advanced Prosthodontics Vol.6 No.6
PURPOSE. Translucency and colour stability are two most important aspects for an aesthetic dental restoration. Glass ceramic restorations are popular amongst clinicians because of their superior aesthetic properties. In the last decade, zirconia has generated tremendous interest due to its favorable mechanical and biological properties. However, zirconia lacks the translucency that lithium disilicate materials possess and therefore has limitations in its use, especially in esthetically demanding situations. There has been a great thrust in research towards developing translucent zirconia materials for dental restorations. The objective of the study was to evaluate and compare the transmittance of a translucent variant of zirconia to lithium disilicate. MATERIALS AND METHODS. Two commercially available zirconia materials (conventional and high translucency) and 2 lithium disilicate materials (conventional and high translucency) with standardized dimensions were fabricated. Transmittance values were measured for all samples followed by a microstructural analysis using a finite element scanning electron microscope. One way analysis of variance combined with a Tukey-post hoc test was used to analyze the data obtained (P=.05). RESULTS. High translucency lithium disilicate showed highest transmittance of all materials studied, followed by conventional lithium disilicate, high translucency zirconia and conventional zirconia. The difference between all groups of materials was statistically significant. The transmittance of the different materials correlated to their microstructure analysis. CONCLUSION. Despite manufacturers' efforts to make zirconia significantly more translucent, the transmittance values of these materials still do not match conventional lithium disilicate. More research is required on zirconia towards making the material more translucent for its potential use as esthetic monolithic restoration.