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Najdi, Roaa Nabil,Komosany, Nabil Abdullah International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.7
The purpose of this study is to explore the role of information systems in the implementation of knowledge management, at King Abdul-Aziz University (KAU) in Jeddah, by highlighting the importance of information systems and their implementation of the knowledge processes. The researcher used the case-study method to explore the importance of information systems in supporting the implementation of knowledge management at the university. Moreover, the study has used the questionnaire as a tool for collecting information and obtaining feedbacks from the administrators at the university, and a random sample was chosen to identify the study community. The study resulted that there is a statistical indication of the importance and degree of the use of electronic systems in the university by the administrators. The study sample members believe that the university is keen to provide information systems, where systems analyze data and convert them into knowledge information that benefits the senior management at the university. Members of the study sample emphasize the importance of electronic information systems at the university, which in turn saves time and effort in extracting information, reports, statistics and providing them easily to senior management. The study also concluded with some recommendations, such as emphasizing the importance of knowledge management as one of its top priorities, spreading the knowledge culture, instilling a vision of knowledge among individuals, and emphasizing the importance of information systems.
Nabil Ngote,Mohammed Ouassaid,Said Guedira,Mohamed Cherkaoui 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
Induction motors are widely used in industrial processes since they offer a very high degree of reliability. But like any other machine, they are vulnerable to faults, which if left unmonitored, might lead to an unexpected interruption at the industrial plant. Therefore, the condition monitoring of the induction motors have been a challenging topic for many electrical machine researchers. Indeed, the effectiveness of the fault diagnosis and prognosis techniques depends very much on the quality of the fault features selection. However, in induction-motor drives, rotor defects are the most complex in terms of detection since they interact with the supply frequency within a restricted band around this frequency, especially in the no-loaded case. To overcome this drawback, this paper deals with an efficient and new method to diagnose the induction-motor rotor fault based on the digital implementation of the monitoring algorithm based on the association of the Time Synchronous Averaging technique and Discrete Wavelet Transform. Experimental results are presented in order to show the effectiveness of the proposed method. The obtained results are largely satisfactory, indicating a promising industrial application of the combined “Time Synchronous Averaging – Discrete Wavelet Transform” approach.
On boundary regularity of holomorphic correspondences
Nabil Ourimi 대한수학회 2012 대한수학회지 Vol.49 No.1
Let D be an arbitrary domain in $\mathbb{C}^n$, n > 1, and $M{\subset}{\partial}D$ be an open piece of the boundary. Suppose that M is connected and ${\partial}D$ is smooth real-analytic of finite type (in the sense of D'Angelo) in a neighborhood of $\bar{M}$. Let f : $D{\rightarrow}\mathbb{C}^n$ be a holomorphic correspondence such that the cluster set $cl_f$(M) is contained in a smooth closed real-algebraic hypersurface M' in $\mathbb{C}^n$ of finite type. It is shown that if f extends continuously to some open peace of M, then f extends as a holomorphic correspondence across M. As an application, we prove that any proper holomorphic correspondence from a bounded domain D in $\mathbb{C}^n$ with smooth real-analytic boundary onto a bounded domain D' in $\mathbb{C}^n$ with smooth real-algebraic boundary extends as a holomorphic correspondence to a neighborhood of $\bar{D}$.
Studying the Physical Parameters of a Solid State Nuclear Track Detector
Nabil M. Hassan,Abdel Fattah Hafez 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.9
Solid state nuclear track detectors (SSNTDs) are widely used to measure various types of ionizingradiation. Thus, studying the physical parameters of SSNTDs, such as the bulk etch rate, the tracketching efficiency and detector sensitivity which could affect the registration efficiency, is important. This paper presents a simple technique used to study the dependence of those characteristic physicalparameters of SSNTDs on the alpha-particle energy. The detector sensitivity and the alpha trackdiameter were found to decrease exponentially with increasing alpha-particle energy’s, which impliesthat the SSNTDs can be used as alpha-particle spectrometers. The bulk etch rates of the LR-115and the CR-39 detectors were found to be 3.75 ± 0.21 µm h−1 and 1.72 ± 0.14 µm h−1, respectively. Moreover, the calibration coefficients of the LR-115 and the CR-39 detectors, placed in a diffusioncup with a fiberglass filter exposed to radon source inside a 50 L calibration chamber (supplied byGenitron, Germany), were found to be 0.036 ± 0.004 and 0.17 ± 0.03 [-tracks cm−2 per (Bq m−3day)], respectively.
Nabil A. H. EL- Khairy 한국풍공학회 2008 Wind and Structures, An International Journal (WAS Vol.11 No.5
An experimental investigation has been conducted to determine the effectiveness of base shield plates in reducing the drag of a rough circular cylinder in a cross flow at Reynolds numbers in the range 3×104⁴≤ Re ≤10.5×104⁴. Three model configurations were investigated and compared: a plane cylinder (PC), a cylinder with a splitter plate (MC1) and a cylinder fitted with base shield plates (MC2). Each configuration was studied in the sub and supercritical flow regimes. The chord of the plates, L, ranged from 0.22 to 1.50D and the cavity width, G, between the plates was in the range from 0 to 0.93D. It is recognized that base shield plates can be employed more effectively than splitter plates to reduce the aerodynamic drag of circular cylinders in both the sub- and supercritical flow regimes. For subcritical flow regime, one can get 53% and 24% drag reductions for the MC2 and MC1 models with L/D = 1.0, respectively, compared with the PC model. For supercritical flow regime however, the corresponding drag reductions are 38% and 7%.
Nabil Ngote,Said Guedira,Mohamed Cherkaoui,Mohammed Ouassaid 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
Induction motors are critical components in industrial processes since their failure usually lead to an unexpected interruption at the industrial plant. The studies of induction motor behavior during abnormal conditions and the possibility to diagnose different types of faults have been a challenging topic for many electrical machine researchers. In this regard, an efficient and new method to detect the induction motor-fault may be the application of the Time Synchronous Averaging (TSA) to the stator current Park’s Vector. The aim of this paper is to present a methodology by which defects in a three-phase wound rotor induction motor can be diagnosed. By exploiting the cyclostationarity characteristics of electrical signals, the TSA method is applied to the stator current Park’s Vector, allowing the monitoring of the induction motor operation. Simulation and experimental results are presented in order to show the effectiveness of the proposed method. The obtained results are largely satisfactory, indicating a promising industrial application of the hybrid Park’s Vector-TSA approach.
NON CONVENTIONAL METHOD FOR SOFT STARTING OF THREE PHASE INDUCTION MOTORS
Nabil A. Ahmed,Sung-Jun Kim,Ki-Young Suh,Soon-Kurl Kown,Hyun-Woo Lee 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents a nonconventional method for soft starting of three-phase induction motors, which achieved by flux weakening technique. Flux weakening is not done by reducing the applied voltage as in the conventional methods. Flux weakening is achieved by increasing the supply frequency over the rated value while the voltage amplitude is kept constant. This method has advantage of reducing the stress on the electrical and mechanical systems. The feasibility of this basic idea has been confirmed through investigating the starting transient corresponding to this mode of operation. For this purpose, a rigorous state space mathematical model has been developed and simulated. The validity of the proposed method through the results from the mathematical model have been confirmed experimentally.
Nabil A. Ibrahim,Heba M. Khalil,Basma M. Eid,Tawfik M. Tawfik 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
Pre-loading of monochlorotriazinyl β-Cyclodextrin (MCT-βCD) onto/within viscose/wool (V/W) and cotton/wool (C/W) blended fabrics provide hosting cavities that can form host-guest inclusion complexes with reactive dyes in postprinting as well as with triclosan derivative or silver nanoparticles/hyperbranched polyamide-amine (AgNPs/HBPAA) composite in subsequent final antibacterial finishing step. Coloration properties, antibacterial activity against (S. aureus) and (E. coli) pathogenic bacteria, durability of the obtained products, according to the above mentioned route, to wash, surface morphology and composition of selected samples were investigated. Results obtained signify that premodification of the nominated substrates with MCT- βCD (10 g/l), followed by reactive printing with mono-or bifunctional reactive dye (20 g/l), and subsequent post-finishing with triclosan derivative or AgNPs/HBPAA composite (15 g/l each) is an efficient treatments sequence for attaining reactive prints with significant antibacterial efficacy and noticeable durability to wash. Surface depositions of selected active ingredients were also confirmed using SEM and EDX analysis.