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Search Results: 1 - 10 of 1119 matches for " BEKKOUCHE Fatima "
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New Geometrical Approach for the Air-gap Reluctance Calculation for the Design of the Machines by the Flow Lines Method
BENATIA B Mostefa,BEKKOUCHE Fatima,BEKKOUCHE Benaissa
Journal of Electrical and Electronics Engineering , 2012,
Abstract: The method of the lines of flow remains always a design method which could be applied by a very broad population of manufacturers for the design of the electric machines. It is an easy method to implement, founded on basic electromagnetism principles. Our article present in general a procedure of calculation of the reluctances of variable reluctance machines (6/4) starting from the use of the analyticalrelations which generate the electromagnetic principles of the machine. A new method based on the simple geometry and the trigonometrically one was used for the calculation of the reluctances of the lines which through the air-gap of the machine. The results of the design obtained by the flow lines method with the application of this new approach were checked by the finite elements method. Analyzes and the comparison of the margins of error remain acceptable.
Exploration of the scalability of LocFaults
Mohammed Bekkouche
Computer Science , 2015,
Abstract: A model checker can produce a trace of counterexample, for an erroneous program, which is often long and difficult to understand. In general, the part about the loops is the largest among the instructions in this trace. This makes the location of errors in loops critical, to analyze errors in the overall program. In this paper, we explore the scalability capabilities of LocFaults, our error localization approach exploiting paths of CFG(Control Flow Graph) from a counterexample to calculate the MCDs (Minimal Correction Deviations), and MCSs (Minimal Correction Subsets) from each found MCD. We present the times of our approach on programs with While-loops unfolded b times, and a number of deviated conditions ranging from 0 to n. Our preliminary results show that the times of our approach, constraint-based and flow-driven, are better compared to BugAssist which is based on SAT and transforms the entire program to a Boolean formula, and further the information provided by LocFaults is more expressive for the user.
Exploration of the scalability of LocFaults approach for error localization with While-loops programs
Mohammed Bekkouche
Computer Science , 2015,
Abstract: A model checker can produce a trace of counterexample, for an erroneous program, which is often long and difficult to understand. In general, the part about the loops is the largest among the instructions in this trace. This makes the location of errors in loops critical, to analyze errors in the overall program. In this paper, we explore the scala-bility capabilities of LocFaults, our error localization approach exploiting paths of CFG(Control Flow Graph) from a counterexample to calculate the MCDs (Minimal Correction Deviations), and MCSs (Minimal Correction Subsets) from each found MCD. We present the times of our approach on programs with While-loops unfolded b times, and a number of deviated conditions ranging from 0 to n. Our preliminary results show that the times of our approach, constraint-based and flow-driven, are better compared to BugAssist which is based on SAT and transforms the entire program to a Boolean formula, and further the information provided by LocFaults is more expressive for the user.
Enhancement of Ferromagnetic Ordering Curie Temperature in N-Doped MgO under Hydrostatic Pressure  [PDF]
Ali Mir, Benaissa Bekkouche, Abdelkader Boukortt, Salima Kacimi, Mostefa Djermouni, Ali Zaoui
Modeling and Numerical Simulation of Material Science (MNSMS) , 2012, DOI: 10.4236/mnsms.2012.22004
Abstract: We have explored the magnetic properties of Nitrogen doped cubic MgO using the full potential linearized augmented plane wave (FP-LAPW) method. The unit cell has 128 atoms, and two Nitrogen atoms are placed in the positions of oxygen sites. This corresponds to 3.125% doping concentration. Our calculations predict that the ferromagnetic state, with a magnetic moment of about 1.0 μB per Nitrogen-dopant, is more favorable in energy than the nonmagnetic state, and the ferromagnetic correlations are influenced by the impurity bound state. The magnetic moment mainly arises from p orbital of Nitrogen which substitutes the Oxygen atom, with a little contribution from the Oxygen atoms surrounding Nitrogen atom. The resulting band structure and densities of states agree well with the recent theoretical works. The ferromagnetic ordering temperatures obtained from DFT simulations have been given in detail. Our results show that the pressure enhances the temperature in MgO:N.
Antibacterial and antioxidant activities of three endemic plants from Algerian Sahara
ELmouloud Bouchouka,Abdelouaheb Djilani,Abdesselem Bekkouche
Acta Scientiarum Polonorum : Technologia Alimentaria , 2012,
Abstract: Background. Saharan plants are known by their high content of antioxidant products like phenolic compounds due to the extreme climatic conditions. They constitute the basis of treatments used by local population for various diseases. The purposes of this study were to measure the total phenolic compounds and total fl avonoid compounds, to determine antioxidant capacity, and to evaluate the antibacterial activity of three wild Saharan medicinal plants. Material and methods. Hexane and ethyl acetate fractions of ethanol:water extract and the residu of the extracted aqueous layer of Ferula vesceritensis fruits, Genista saharae aerial parts and Zilla macropterae fruits were assayed to determine their antibacterial activity using the disc diffusion method against: Escherichia coli (ATCC 25922), Staphylococcus aureus (ATCC 25923) and Pseudomonas aeruginosa (ATCC 27853). In addition, the total phenolic compounds and total fl avonoids and antioxydant activity using DPPH test of ethyl acetate fractions (EAF) of plant parts studied were investigated. Gallic acid, quercetin and vitamin C were used for these parameters. Results. Among the extracts tested, ethyl acetate fractions of all plants and hexane fraction of F. vesceritensis showed activity against S. aureus. Good activity was shown by EAF of G. saharae. According to the results, it is observed that Z. macropterae fruits possess a good antioxidant activity. Conclusion. The results indicate that the ethyl acetate fraction of G. sahara Aerial parts possesses a good antibacterial activity against S. aureus, which justifi es its use in traditional medicine for treating respiratory diseases. Furthermore, evaluation of in vitro antioxidant capacity of Ethyl acetate fractions of these plants, particular Z. macroptera fruits, has also provided interesting results. Zilla macroptera fruits may therefore be a good source of antioxidants.
A New Watermarking Approach Based on Combination of Reversible Watermarking and CDMA in Spatial and DWT Domain
S.Bekkouche & A.Chouarfia
International Journal of Security , 2011,
Abstract: Image watermarking can be defined as a technique that allows insertion of imperceptible andindelible digital data into an image. In addition to its initial application which is the copyright,watermarking can be used in other fields, particularly in the medical field in order to contribute tosecure images shared on the network for telemedicine applications. In this report we study somewatermarking methods and the comparison result of their combination, the first one is based onthe CDMA (Code Division Multiple Access) in DWT(Discrete Wavelet Transform) domain, notedCDMA-DWT and CDMA in spatial domain, noted CDMA-SD and their aim are to verify theimage authenticity whereas the second one is the reversible watermarking (the least significantbits LSB and cryptography tools) , the reversible carte mapping RCM their objective are to checkthe integrity of the image and to keep the Confidentiality of the patient data. A new scheme ofwatermarking is the combination of the reversible watermarking method and the method ofCDMA-DWT and the second is the combination of the reversible watermarking and the methodof CDMA-sp to verify the three security properties Integrity, Authenticity and Confidentiality ofmedical data and patient information. In the end, we made a comparison between these methodswithin the parameters of quality of medical images Initially, an in-depth study on thecharacteristics of medical images would contribute to improve these methods to measurementshave been done on the watermarked image to verify that this technique does not lead to a wrongdiagnostic. The robustness of the watermarked images against attacks has been verified on theparameters of PSNR (Peak Signal to Noise Ratio), MSE (Mean Square Error), MAE (MeanAbsolute Error) and SNR (Signal to Noise Ratio ) which show that the resulting quality ofcombination watermarking method is good in DWT than other techniques.
Fuzzy Logic Controller Optimization Based on GA for Harmonic Mitigation
Rachid Dehini,Brahim Ferdi,Benaissa Bekkouche
Journal of Artificial Intelligence , 2012,
Abstract: In this paper, a pulse generation method to trigger the MOSFETs of a shunt active power filter (SAPF) inverter is examined. The proposed method is aimed to compensate current harmonic, as well as reactive power compensation, in power systems with a large concentration of non-linear loads. Design of optimal fuzzy logic controller by genetic algorithm method is presented. Some parameters defining the fuzzy controller (membership functions, fuzzy rules) are optimized simultaneously. In order to investigate the performance of this control method, all studies have been carried out using simulation with the MATLAB Simulink power system toolbox. The results of simulation study of new SAPF control technique presented in this paper are found to be quite satisfactory by assuring good filtering characteristics and high system stability.
Thyroid Cancer in Western Algeria: Histopathological and Epidemiological Study  [PDF]
A. Benouis, Z. Bekkouche, M. S. Merad, L. Loudjedi, H. Khelil, N. Berber
Journal of Cancer Therapy (JCT) , 2017, DOI: 10.4236/jct.2017.87058
Abstract: Thyroid cancer is relatively rare, about 1% of all cancers combined. However, it accounts for 88% of all cancers of the endocrine organs. In recent years, the incidence of thyroid cancer has increased considerably compared to other types of endocrine cancers. The aim of our work is to study the epidemiological profile of thyroid cancer in the western part of Algeria and to determine the influence of sex, age and histological type. Patients and methods: Our study focuses on 1376 cases of thyroid cancer in patients attending the nuclear medicine department at the university hospital of Tlemcen over a period of 3 years, from 2013 to 2015. The average age of patients is estimated at 43. Each patient underwent an anatomo-histopathological examination of the surgical specimen. The data entry is done through the SPSS 20 statistical software. Results: The rates of the thyroid cancers listed during the three years of studies (2013-2014-2015) are 32.12%, 34.44% and 33.43% respectively. Our study shows that the female sex is largely incriminated (94.75%) compared to the male sex. The age group mostly affected was that ranging from 40 to 60 with 45.88%. The anatomo-histopathological analysis revealed that the papillary carcinoma is the most frequent histological type with 85.47% followed by the vesicular carcinoma with 14%, the medullary cancer MTC with 0.43%, and finally the anaplastic carcinoma with 0.07%. Conclusion: the epidemiological surveillance contributes to a better knowledge of thyroid carcinoma allowing a good patient management in Algeria. Early detection of small size cancers and the use of high-performing technologies will result in a decrease of the mortality rate associated to this type of cancer.
Biology and distribution of butterfly fauna of Hazara University, Garden Campus, Mansehra, Pakistan  [PDF]
Farzana Perveen, Fatima Fazal
Open Journal of Animal Sciences (OJAS) , 2013, DOI: 10.4236/ojas.2013.32A004
Abstract: The butterflies are beautiful creature of nature with great economic importance as pollinator as well as bio-indicator of environments. The present survey was conducted to determine the biology and distribution of butterfly fauna of Hazara University, Garden Campus, Mansehra, Pakistan during March-June 2012. The study area was divided into 3 quadrates, i.e., residential area, administration area and main campus. A total of 170 specimens were collected, 10 species were identified belonging to 3 different families and falling in 8 genera. The species were identified. The painted lady, Cynthia cardui (Linnaeus); blue pansy, Junonia orithya Linnaeus; and plain tiger, Danaus chrysippus (Linnaeus) were belonging to family Nymphalidae. The lime butterfly, Papilio demoleus Linnaeus and com-mon mormon, P. polytes Linnaeus were belonging to family Papilionidae. The dark clouded yellow, Colias croceus (Geoffroy); common grass yellow, Eumera hecab (Linnaeus); Murree green-veined white, Pieris ajaka Moore; green-veined white, P. napi (Linnaeus) and Bath white, Pontia daplidice (Linnaeus) were belonging to family Pieridae. The body sizes of E. hecabe and J. orithya were minimum, i.e.
Studies on Phytochemical Evaluation and Antibacterial Properties of Two Varieties of Kolanut (Cola nitida) in Nigeria  [PDF]
S. Muhammad, A. Fatima
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.23006
Abstract: Kola nut is a native stimulant which is commonly chewed in many West African cultures, individually or in a group setting. It is often used ceremonially and to honour guest. Phytochemical analysis and antibacterial screening of red and white Cola nitida (kola nut) extracts were evaluated using qualitative and quantitative method. Thin layer chromatography (TLC) was used to
evaluate the phenolic content. Antibacterial screening was done using agar well diffusion method against odontopathogens; (Lactobacillus sp., Corynebacterium haemolyticum, Proteus vulgans, Bacillus lentus, Streptococcus anginosus and Pseudomonas aeruginosa) obtained from stock cultures. Phytochemical screening revealed the presence of alkaloids, flavonoids, saponin, tannins, glycoside, steroids, volatile oil and balsams. Higher content of alkaloids, saponin and glycoside was obtained in the aqueous extract than the methanol for both red and white kola nut. The results of TLC analysis revealed the presence of quercetin and coumarin in red kola and keamferol and coumarin in white kola respectively. The result of antibacterial activity of red C. nitida showed a zone of inhibition of 18 mm and 23 mm at 60 mg/ml for aqueous extract on Proteus vulgans and
Streptococcus anginosus. Similarly white kola inhibited the growth of S. anginosus at 90 mg/ml with a zone of 18 mm. Methanol extract of red kola inhibited the growth of P. vulgans and S. anginosus at 60 mg/ml with a zone of 16 mm and 20 mm respectively. Acetone and ethyl acetate extracts of both red and white kola nut did not show any activity against the tested organism at all concentrations. The results obtained indicate that C. nitida which posses promising chemotherapeutic and antibacterial potentials respectively that could be useful against odontopathogens. The study may serve as baseline for further studies.
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