oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

9 ( 1 )

2018 ( 166 )

2017 ( 219 )

2016 ( 240 )

自定义范围…

匹配条件: “ Ali Labriji” ,找到相关结果约18298条。
列表显示的所有文章,均可免费获取
第1页/共18298条
每页显示
Impact of Eating Habits and Lifestyle on the Oral Health Status of a Casablanca’s Academic Population  [PDF]
Houriya Mestaghanmi, Ali Labriji, Imane M’Touguy, Fatima Zahra Kehailou, Said Idhammou, Nabil Kobb, Fatema Zahra Mahfoud, Ahmadaye Ibrahim Khalil, Souad El Amrani
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104967
Abstract:
Introduction: Bad eating habits can have serious impact on oral health. Objec-tives: To study the impact of eating habits and dental hygiene practices on the dental status of students. Methods: Cross-sectional study of 400 students aged 17 and more, from the Ben M’Sik Sciences Faculty. A questionnaire on the so-cio-economic level of the parents, the eating habits, the means of hygiene and the oral health status has been filled in anonymously by the respondents. Uni-variate and multivariate descriptive and comparative analyzes were per-formed by the software SPSS 21. Results: The population’s average age is 20 ± 1.59 years old consisted of 55% of boys and 45% of girls. The breakfast is consumed by 67% of students. 39.58% respondents consume sweetened drinks during the meals and 60% at the end of meals and 66% are snacking during the day. 92% of students say they brush their teeth. The brushing time varies between 1 and 3 minutes. 37% of students do never consult a dentist and 63% in case of dental problems. The prevalence of caries is 66%. There is a positive association between the prevalence of tooth decay and certain eating habits (sweet things consumption (p = 0.08), cakes (p = 0.018) and chocolate (p = 0.019) outside of meals). However, this correlation is negative, when the consumption of these foods is done during meals (p > 0.74). On the other hand, there was no correlation between alcohol consumption and presence of caries (p = 0.172), tobacco consumption (p = 0.319), and socioeconomic status parents (p = 0.733). Conclusion: Oral hygiene and regular monitoring by a dentist with healthy eating habits can have a significant impact on the oral status of students.
Modelling the spread of HIV-AIDS in Morocco
Mohamed El Hia,O. Balatif,H. Ferjouchia,E. Labriji
International Journal of Computer Science Issues , 2012,
Abstract: In this article, we propose a non-linear mathematical model with a variable size population to study the spread of HIV/AIDS in Morocco. We estimate the parameters that include this model based on real data. An estimation of the basic reproductive number R0 and some numerical simulations that provide insights into the future of HIV/AIDS in Morocco are also presented in this study.
Optimal control applied to the spread of influenza A(H1N1)
M. El hia,O. Balatif,J. Bouyaghroumni,E. Labriji
Applied Mathematical Sciences , 2012,
Abstract:
Ultrastructural Identification of the Basal-Granulated Cells in the Duodenum of Albino Rat  [PDF]
Ali Hassan A. Ali
Open Journal of Gastroenterology (OJGas) , 2014, DOI: 10.4236/ojgas.2014.47041
Abstract: The fine structure of the crypt epithelium of the duodenal mucosa in albino rats was studied to represent the types and distribution of the basal-granulated or endocrine cells. Twenty male animals were used. Perfusion-fixation was made and samples of duodenal mucosa were taken and processed to prepare epon-embedded specimens for examination by a transmission electron microscope. Cells containing membrane-bound granules were seen in the crypt epithelium. They were identified to be basal-granulated cells. Six different types of such cells were demonstrated. All of the cells were of the closed type. The possible functional significance of these closed cell types was discussed. Correlation among the distributions of such cells in the intestine of albino rat might enable the physiologists, internists and other research workers to study several biologically active peptides with well-established functions other than those which have long been investigated.
A Primal-Dual Simplex Algorithm for Solving Linear Programming Problems with Symmetric Trapezoidal Fuzzy Numbers  [PDF]
Ali Ebrahimnejad
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.26089
Abstract: Two existing methods for solving a class of fuzzy linear programming (FLP) problems involving symmetric trapezoidal fuzzy numbers without converting them to crisp linear programming problems are the fuzzy primal simplex method proposed by Ganesan and Veeramani [1] and the fuzzy dual simplex method proposed by Ebrahimnejad and Nasseri [2]. The former method is not applicable when a primal basic feasible solution is not easily at hand and the later method needs to an initial dual basic feasible solution. In this paper, we develop a novel approach namely the primal-dual simplex algorithm to overcome mentioned shortcomings. A numerical example is given to illustrate the proposed approach.
Application of Linear Model Predictive Control and Input-Output Linearization to Constrained Control of 3D Cable Robots  [PDF]
Ali Ghasemi
Modern Mechanical Engineering (MME) , 2011, DOI: 10.4236/mme.2011.12009
Abstract: Cable robots are structurally the same as parallel robots but with the basic difference that cables can only pull the platform and cannot push it. This feature makes control of cable robots a lot more challenging compared to parallel robots. This paper introduces a controller for cable robots under force constraint. The controller is based on input-output linearization and linear model predictive control. Performance of input-output linearizing (IOL) controllers suffers due to constraints on input and output variables. This problem is successfully tackled by augmenting IOL controllers with linear model predictive controller (LMPC). The effecttiveness of the proposed method is illustrated by numerical simulation.
A Study on Wear Resistance, Hardness and Impact Behaviour of Carburized Fe-Based Powder Metallurgy Parts for Automotive Applications  [PDF]
Ali Emamian
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.38073
Abstract: In order to study the mechanical and triboloical properties of powder metallurgy (PM) parts under different process parameters, the specimens were used in pack carburizing processes. These specimens made from industrial test pieces were carburized in a powder pack for about two to five hours at a temperature of about 850?C - 950?C. The effects of austenitization and quenching are investigated on some specimens. Also the wear tests are performed by means of a pin-on-disc tribotester using roll bearing steel as the counterface material. The results indicate that by appropriate selection of process parameters, it is possible to obtain high wear resistance along with moderate toughness. It is concluded that surface treatments increases the wear resistance and performance of PM parts in service conditions. By increasing the role of PM in industry which resulted from their ability to produce the complex shapes, high production rate, and dimension accuracy of final products, they need to be heat treated. Carburizing method was selected as a surface hardening method for PM parts. Results of wear and hardness show considerable enhancement in mechanical properties of PM parts.
Influence of Ferric and Ferrous Iron on Chemical and Bacterial Leaching of Copper Flotation Concentrates  [PDF]
Ali Ahmadi
International Journal of Nonferrous Metallurgy (IJNM) , 2012, DOI: 10.4236/ijnm.2012.13006
Abstract: The effects of ferrous and ferric iron as well as redox potential on copper and iron extraction from the copper flotation concentrate of Sarcheshmeh, Kerman, Iran, were evaluated using shake flask leaching examinations. Experiments were carried out in the presence and absence of a mixed culture of moderately thermophile microorganisms at 50?C. Chemical leaching experiments were performed in the absence and presence of 0.15 M iron (ferric added medium, ferrous added medium and a mixture medium regulated at 420 mV, Pt. vs. Ag/AgCl). In addition, bioleaching experiments were carried out in the presence and absence of 0.1 M iron (ferric and ferrous added mediua) at pulp density 10% (w/v), inoculated bacteria 20% (v/v), initial pH 1.6, nutrient medium Norris and yeast extract addition 0.02% (w/w). Abiotic leaching tests showed that the addition of iron at low solution redox potentials significantly increased the rate and extent of copper dissolution but when ferric iron was added, despite a higher initial rate of copper dissolution, leaching process stopped. Addition of both ferrous and ferric iron to the bioleaching medium levelled off the copper extraction and had an inhibitory effect which decreased the final redox potential. The monitoring of ferrous iron, ferric iron and copper extraction in leach solutions gave helpful results to understand the behaviour of iron cations during chemical and bacterial leaching processes.
Nitrification of Reactively Magnetron Sputter Deposited Ti-Cu Nano-Composite Thin Films  [PDF]
Ali Rahmati
Soft Nanoscience Letters (SNL) , 2013, DOI: 10.4236/snl.2013.31004
Abstract:

A metalloid Ti13Cu87 target was sputtered by reactive DC magnetron sputtering at various substrate temperatures in an Ar-N2 mixture ambient. The sputtered species were condensed on Si (111), glass slide and Potsssium bromide (KBr) substrates. The as-deposited films were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), optical spectrophotometry and four point probe technique. The as-deposited films present composite structure of nano-crystallite cubic anti-ReO3 structure of Ti inserted Cu3N (Ti:Cu3N) and nano-crystallite face centre cubic (fcc) structure of Cu. The titanium atoms and sequential nitrogen excess form a solid solution within the Cu3N crystal structure and accommodate in crystal lattice and vacant interstitial site, respectively. Depending on substrate temperature, unreacted N atoms interdiffuse between crystallites and their (and grain) boundaries. The films have agglomerated structure with atomic Ti:Cu ratio less than that of the original targets. A theoretical model has been developed, based on sputtering yield, to predict the atomic Ti:Cu ratio for the as-deposited films. Film thickness, refractive index and extinction coefficient are extracted from the measured transmittance spectra. The films’ resistivity is strongly depending on its microstructural features and substrate temperature.

An Automata-Based Approach to Pattern Matching  [PDF]
Ali Sever
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.43036
Abstract: Due to its importance in security, syntax analysis has found usage in many high-level programming languages. The Lisp language has its share of operations for evaluating regular expressions, but native parsing of Lisp code in this way is unsupported. Matching on lists requires a significantly more complicated model, with a different programmatic approach than that of string matching. This work presents a new automata-based approach centered on a set of functions and macros for identifying sequences of Lisp S-expressions using finite tree automata. The objective is to test that a given list is an element of a given tree language. We use a macro that takes a grammar and generates a function that reads off the leaves of a tree and tries to parse them as a string in a context-free language. The experimental results indicate that this approach is a viable tool for parsing Lisp lists and expressions in the abstract interpretation framework
第1页/共18298条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.