OALib Journal期刊

ISSN: 2333-9721



匹配条件: “ Nabil Kobb” ,找到相关结果约608条。
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
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.
Improving Rule Base Quality to Enhance Production Systems Performance  [PDF]
Nabil Arman
International Journal of Intelligence Science (IJIS) , 2013, DOI: 10.4236/ijis.2013.31001
Abstract: Production systems have a special value since they are used in state-space searching algorithms and expert systems in addition to their use as a model for problem solving in artificial intelligence. Therefore, it is of high importance to consider different techniques to improve their performance. In this research, rule base is the component of the production system that we aim to focus on. This work therefore seeks to investigate this component and its relationship with other components and demonstrate how the improvement of its quality has a great impact on the performance of the production system as a whole. In this paper, the improvement of rule base quality is accomplished in two steps. The first step involves re-writing the rules having conjunctions of literals and producing a new set of equivalent rules in which long inference chains can be obtained easily. The second step involves augmenting the rule base with inference short-cut rules devised from the long inference chains. These inference short-cut rules have a great impact on the performance of the production system. Finally, simulations are performed on randomly generated rule bases with different sizes and goals to be proved. The simulations demonstrate that the suggested enhancements are very beneficial in improving the performance of production systems.
Product Ethnicity between the Hammer of Identity and the Anvil of Globalization  [PDF]
Jeddi Nabil, Zaiem Imed
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.31011

With the globalization of markets, the multinational production made obvious great strides marked by the proliferation of hybrid or bi-national products. In this context which supported the dissolution of identity of several products’ categories and called in question the weight of origin labels about the consumer behavior purchase. Beyond these reflections, this article proposed to wonder about the relation between globalization and product ethnicity, by analyzing the apparent effects of the current context of globalization on the establishment of stereotypic country-products associations by the consumers. Also, the question which is directed to the development and the presentation of this research is the following one: to what extend does the current context of globalization enable us to call in question the phenomenon of product ethnicity?

On Slide Mode Control of Chaotic Rikitake Two-Disk Dynamo—Chaotic Simulations of the Reversals of the Earth’s Magnetic Field  [PDF]
Ahmad Harb, Nabil Ayoub
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2014, DOI: 10.4236/ijmnta.2014.33015

The modern nonlinear theory, bifurcation and chaos theory are used in this paper to analyze the dynamics of the Rikitake two-disk dynamo system. The mathematical model of the Rikitake system consists of three nonlinear differential equations, which found to be the same as the mathematical model of the well-known Lorenz system. The study showed that under certain value of control parameter, the system experiences a chaotic behaviour. The experienced chaotic oscillation may simulate the reversal of the Earth’s magnetic field. The main objective of this paper is to control the chaotic behaviour in Rikitake system. So, a nonlinear controller based on the slide mode control theory is designed. The study showed that the designed controller was so effective in controlling the unstable chaotic oscillations.

A Model for FeSiMg Alloy Production by Reduction Technique  [PDF]
Saeed Nabil Saeed Ghali
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.109067
Abstract: Ferrosilicon magnesium is basic foundry alloys used for the production of ductile cast iron. Magnesium content plays an important role in the produced alloy grades from dolomite ore. The focus of the present work is to simulate mathematical model to predict magnesium content in the ferrosilicon magnesium, which produced by silicothermic reduction of calcined dolomite. The basic assumptions of this model are: constant low viscosity of molten charge, the reaction is irreversible of second order and the reaction is isothermal. The reaction is based on the following equation: 2MgO+2Si →Mg2Si+SiO2 The results of previous work was found to be in a good coincidence with the predicted values by the model [Mg]=(MgO0)[Si0][eKt[(MgO0)-[Si0]]-1]/ (MgO0)[eKt[(MgO0)-[Si0]]-[Si0]] where [Mg] is the concentration of magnesium metal in ferrosilicon magnesium alloy in mol/L. [Si0] and (MgO0) are the initial concentration of silicon and magnesium oxide in charge in mol/L, while t is time in second, K is the reaction rate constant ( 3.26588x10-7 L Sec-1 mol-1). The predicted values are greater than the experimental values; this may be attributed to the use of concentration instead of the activity. The predicted values of magnesium content in ferrosilicon magnesium alloy are in a good agreement with the experimental results obtained in previous work at low viscosity.
Mechanisms of the Deterioration of the Wall Reliefs at Shenhur Temple, Upper Egypt and Concepts for Conservation  [PDF]
Nabil A. Bader
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.511071
Abstract: The Roman Period temple of Isis at Shenhur was built and enhanced amid the rule of Augustus (30 BCE-14 CE) through that of Trajan (98-117 CE). It was built of two sorts of local limestone and decorated with reliefs. Examination of conservation state uncovered that it was collapsed and only partly preserved and it disposed of some still buried rooms. The temple is exposed to different deteriorations processes created by internal and external stresses because of the mineral composition of the building materials, atmosphere variables, salts crystallization and groundwater. In this study, the deterioration problems of the wall reliefs were examined for the aim of its conservation. For this purpose, the chemical, physical and structural characterization were performed by means of X-Ray Diffraction (XRD) and observation of thin section by transmitted light optical microscopy (LOM), polarized microscope, Scanning Electron Microscope (SEM) attached with EDX and thermogravimetric (DTA & TGA). Additionally, microbiological study and chemical analyses of ground water were carried out. Results demonstrated that the deterioration of Shenhur was because of the forceful activity of the environment agents and soluble salts such as chlorides and sulphates. These results and information allowed that the identification of the types of salts and deterioration features might be used in the future for conservation purposes.
Concircular π-Vector Fields and Special Finsler Spaces  [PDF]
Nabil L. Youssef, Amr Soleiman
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.32040

The aim of the present paper is to investigate intrinsically the notion of a concircular π-vector field in Finsler geometry. This generalizes the concept of a concircular vector field in Riemannian geometry and the concept of concurrent vector field in Finsler geometry. Some properties of concircular π-vector fields are obtained. Different types of recurrence are discussed. The effect of the existence of a concircular π-vector field on some important special Finsler spaces is investigated. Almost all results obtained in this work are formulated in a coordinate-free form.

A rare bladder cancer - small cell carcinoma: review and update
Nabil Ismaili
Orphanet Journal of Rare Diseases , 2011, DOI: 10.1186/1750-1172-6-75
Abstract: Small cell carcinoma of the bladderPoorly differentiated neuroendocrine carcinoma of the bladderSmall cell carcinoma of the bladder (SCCB) is a rare, poorly differentiated neuroendocrine epithelial tumour associated with a more aggressive behaviour and poorer outcome than bladder transitional cell carcinoma (TCC). It is mostly diagnosed at advanced stage and generally believed to have a high metastatic potential. Current knowledge of this disease is limited and was based mainly on retrospective investigations. The disease was initially described in 1981 by Cramer et al [1]. Bladder small cell carcinoma (SCC) is frequently found combined with other histological forms of bladder cancer: TCC, adenocarcinoma and squamous cell carcinoma [2-10]. The pathogenesis of primary SCCB is unknown. However, several hypotheses were proposed to explain the origin of SCC in the bladder. The most important hypothesis was: the origin of SCCB may be a multipotential common stem cell. Treatment of SCCB is extrapolated from the treatment of small cell lung carcinoma (SCLC). This comprehensive review would provide a real insight into the epidemiology, pathogenesis, diagnosis, staging, treatment, and prognosis of SCCB.We based our review on the MEDLINE database using the key words 'bladder cancer', 'small cell carcinoma', 'pathogenesis', 'diagnosis', 'treatment', and 'prognosis'. The research was performed since January 1980 up to July 2011. Only one prospective phase II study was reported in the English literature. Twenty retrospectives studies including ≥ 20 patients have been reported. There have also been several interesting case reports and literature reviews.Small cell cancer of the bladder is an extremely rare bladder malignancy with a mean frequency of 0.7% and a range between 0.35% and 1.8% [2-7]. The reported incidence is less than 1-9/1,000,000 habitant. Since 1980, less than 1000 cases of SCCB have been diagnosed and reported in the literature up to July 2011. The demographic ch
Treatment of colorectal liver metastases
Nabil Ismaili
World Journal of Surgical Oncology , 2011, DOI: 10.1186/1477-7819-9-154
Abstract: Colorectal cancer (CRC) is the third most commonly diagnosed cancer in males and the second in females. It is the second most deathly cancer worldwide. About 1.2 million new cases and 608,700 deaths were reported to have occurred in 2008. However, the mortality rates have been decreasing dramatically in western countries largely resulting from improved treatment and increased awareness and early detection [1].Liver is the most common site of metastasis from colorectal cancers (50-60% of the cases). Close to one third of patients have liver metastases either at the time of diagnosis (synchronous in 1/3 of the cases) or during the disease course (metachronous in 2/3 of the cases).The prognosis of colorectal liver metastases (CRLM) has improved in the last few years. Surgical resection of liver metastases is considered the only curative treatment option for patients with resectable liver metastases and no extrahepatic disease [2,3]. Five years survival has increased from <8%, using palliative chemotherapy (CT), to 25-40% using multimodal management including CT and surgery [1,2,4-7]Liver metastases are resectable in only 15% of the cases. Eighty five percents of the patients are ineligible to surgery because of the location, the size, the number of liver metastases, the residual normal liver, and the extra hepatic disease [2,8]. After primary surgery, the rate of relapse is high. This has led the investigators to evaluate the role of neoadjuvant and adjuvant CT in the management of these patients [9]. Furthermore, neoadjuvant CT is being increasingly used to downsize CRLM and render 10% to 30% of initially unresectable patients potentially resectable [8,10]. Local hepatic arterial infusion (HAI) CT after liver resection has proved to be effective; however, this technique is not widely used, because of concern of complications and the technical difficulties [11-13].In general, the term neoadjuvant is used when the CT treatment is given preoperatively, adjuvant when the
A Simple Assessment for Nonlinear Control Using Fuzzy Logic Approximators
Nabil Derbel
Asian Journal of Information Technology , 2012,
Abstract: This study is aimed at looking into the use of fuzzy logic systems for the control of nonlinear problems. Two approaches of control are used. The first approach considers the determination of optimal control strategies. The second one considers the use of variable structure control systems. The aim is the use of fuzzy systems as approximators of nonlinear control laws.

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