@article { author = {Farag, M. and Sadek, A. and Shousha, H. and Al-Hagg, A. and Kitis, G.}, title = {RELIABILITY OF REUSING THE SENSITIZED LIF THERMOLUMINESCENCE DOSIMETERS}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {1-12}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86750}, abstract = {The reliability of reusing the sensitized thermoluminescence (TL) for LiF (TLD-100) dosimeters have been investigated. It has been found that reusing the same sensitized LiF dosimeters may influence the sensitivity of the dosimeters even under the same experimental conditions when the temperature readout range does not include the high-temperature TL signal at T > 505K. But, if the high-temperature TL signal is included in the temperature readout range, it has been found that the ultra-high temperature TL signal significantly increases with increasing the number of reusing the dosimeters. After almost 7 times of reusing the sensitized dosimeters, the total area under the glow-curve becomes stable and independent of the number of reusing the dosimeters. It has been also found that the TL signal located between the low-temperature TL signal and the ultra-hightemperature TL signal was almost stable over all the number of reusing the dosimeters. For all the lowtemperature peaks, the kinetics parameters of the sensitized LiF dosimeters have not to be influenced by reusing the same dosimeters. However, the activation energy of peak 5 which lies at temperature range (460-500K) has been influenced by the readout temperature range and reusing the dosimeters. The typical value for this glowpeak has been obtained in the case which the high-temperature TL signal has been included in the temperature readout.}, keywords = {sensitization,Glow curve analysis,Successive irradiation,Readout temperature}, url = {https://absb.journals.ekb.eg/article_86750.html}, eprint = {https://absb.journals.ekb.eg/article_86750_8e2790fb6cc097c924e68855a01fc759.pdf} } @article { author = {Mahmoud, M. and Diab, L. and Ghazal, M.}, title = {ON STUDY OF EXPONENTIATED GAMMA DISTRIBUTION BASED ON UNIFIED HYBRID CENSORED DATA}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {13-27}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86749}, abstract = {In this article, we will study the estimation of the unknown parameters for exponentiated gamma distribution as well as a survival function, failure rate function and the coefficient of variation based on unified hybrid censored data. In addition that, we will study maximum likelihood and Bayesian estimates. To calculate the Bayes estimates of the model parameters  will beused Markov chain Monte Carlo method (MCMC). Gibbs within the Metropolis-Hasting algorithm has been applied to generate MCMC samples from the posterior density function and calculate approximate confidence intervals for the unknown parameters, survival, failure rate functions and coefficient of variation. All resultsobtained are based on the balanced-squared error loss, balanced linear-exponential loss, and balanced general entropy loss functions. At the end of article, real data has been used to determine how the estimation method can be used in practice.}, keywords = {Exponentiated gamma distribution,Unified hybrid censored data,Bayesian estimation,MCMC method}, url = {https://absb.journals.ekb.eg/article_86749.html}, eprint = {https://absb.journals.ekb.eg/article_86749_42cff7d9a32a8f92e76835f9432d0f59.pdf} } @article { author = {Elsayed, Eman}, title = {BIO-INSPIRED COMPUTING VIA ONTOLOGY TO ENHANCE TAKING A DECISION ON HETEROGENEOUS DATA}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {29-36}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86748}, abstract = {Although Ontology supports phases of the decision support systems DSSs, there isn’t a standard method in which we could modeled decisions in Ontologies. Heterogeneity in data sources is a challenge in decision support systems. Sometimes, explore the knowledge without integrating data sources is wrong. So, this paper proposed a semantic enhancement on the genotype/phenotype system. That is for a communication decision support system based on the Ontology decision support system framework ODSS. This paper introduced a compact representation, and a search strategy based on the universal Ontology. The proposed method is general to handle any data mining technique on large heterogeneous data. That is by adapting the components of the Gene Expression system in biology. The main components of the Gene Expression system are Genome, phenotype, and mutation. The adaptation is by Ontology to help the communication decision support system. The method adapts mutation as a somatic mutation. We tested the proposed method by applying it on the big sample of heterogeneous communication data. }, keywords = {Decision support system,ontology,Association Rules,Somatic mutation,genotype/phenotype}, url = {https://absb.journals.ekb.eg/article_86748.html}, eprint = {https://absb.journals.ekb.eg/article_86748_d27443e85093a530feeb93f0ef600342.pdf} } @article { author = {Alsaba, L. and Ashoush, M. and Elsayed, S. and Eid, A. and Abdelghany, A.}, title = {CHARACTERIZATION OF ZINC OXIDE NANOPARTICLES PREPARED BY SONOCHEMICAL METHOD WITH DIFFERENT ULTRASONIC EXPOSURE POWER}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {1-6}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86747}, abstract = {In the present study ZnO nanoparticles have been synthesized using sonochemical technique at different ultrasonic exposure power. The powers were 20%, 40% and 60% of the total power of ultrasonic generator (operating at 20 kHz with a maximum power output of 250 W). The experimental procedures were carried out in Ultrasonic Lab, National Institute for Standards, Egypt. ZnO nanoparticles samples were investigated by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), UV visible Absorption and Fourier Transform Infrared Spectroscopy (FTIR). XRD and TEM results reveal that Exposure power has a pronounced effect on both particle size as well as morphology. The greater the exposure power, the larger the particle size. In addition, the morphology of ZnO nanoparticles modified from rod-like shape to semi-spherical shape by raising the exposure power. The band gap for all samples estimated by UV absorption data was found to be around 3.1 eV. The ZnO absorption band was observed at 560 cm-1 in FTIR spectra. }, keywords = {Sonochemical method,exposure power,crystalline size}, url = {https://absb.journals.ekb.eg/article_86747.html}, eprint = {https://absb.journals.ekb.eg/article_86747_05730e60313c6de33ac3f61c0963b520.pdf} } @article { author = {Alsaba, L. and Ashoush, M. and Abdelghany, A. and Elsayed, S. and Eid, A.}, title = {STUDYING THE STRUCTURAL AND OPTICAL PROPERTIES OF ZNO NANOPARTICLES PREPARED BY SONOCHEMICAL METHOD}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {7-12}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86746}, abstract = { In this study ZnO nanoparticles have been prepared by sonochemical method (also known as sonochemitry). The aim of using this method is the simplicity of obtaining nanoparticles in small times and without using any heating to initiate the chemical reaction. Different with other traditional chemical methods, the sonochemical method is based on acoustic cavitations. The formation, growth and collapse of bubbles in the liquid were generating localized hot spots with very high temperatures of 5000–25,000 K. These temperatures are enough to initiate the chemical reaction. ZnO nanoparticles with sizes in the range (28- 24 nm) are obtained by changing the time of sonication, the time period in which the suspension was exposed to Ultrasound waves. The optical band gap which obtained from UV measurements was found to be about 3.1 eV for all samples and the characteristic band gap of ZnO was at around 560 cm-1.}, keywords = {ZnO nanoparticles,Sonochemical method,Sonication time,Particle size,Optical properties}, url = {https://absb.journals.ekb.eg/article_86746.html}, eprint = {https://absb.journals.ekb.eg/article_86746_9e938d0713f736bc8231f11658fa2591.pdf} } @article { author = {Ali, Nabila and Ahmed, Omayma and Abdou, Saleh}, title = {APPLICATION OF GAMMA RADIATION FOR REMEDIATION OF PETROLEUM CONTAMINATION FROM SOME REFINERIES IN THE VICINITY OF SUEZ GULF}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {13-18}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86745}, abstract = {Suez Gulf has been affected by the discharged pollutants. The concentration of adsorbed poly-aromatic hydrocarbons (PAHs) in aquatic sediment is an appropriate index of the status of pollutants in the marine environment. Sediment samples were collected from five sites covers 2.5 km at equal distances along the outlets of the discharge basins of some petroleum refineries in the vicinity of Suez Gulf. The concentrations of (PAHs) were determined via HPLC analysis. The concentrations in sediments in the five sites varied between 22333.983±102  and 73597.864±187 ng/g dry weights with 43016.278±149  ng/g dry weights as the average concentration. Gamma irradiation of the polluted samples were performed and compared with the non-irradiated polluted samples, the changes in the PAHs concentrations were observed. The remediation of toxic pollutants of PAHs as petroleum residues by Gamma radiation has been observed. So the influence of applied dose on the degradation of  PAHs concentrations in sediment samples has been studied. The results indicate that, the concentration of PAHs in the irradiated samples of sediments ranged between 16.231±3.7 and 188.531±12.2 ng/g dry weights with 82.184±7.3 ng/g dry weights as the average concentration. Which means that the gamma radiation has a high effect on the PAHs pollution. The variation in the concentrations of the PAHs in the extracted oils with the gamma irradiation followed by HPLC analyses, is investigated}, keywords = {PAHs,gamma radiation,HPLC,Remediation,Adsorption,Polluted sediment}, url = {https://absb.journals.ekb.eg/article_86745.html}, eprint = {https://absb.journals.ekb.eg/article_86745_dd1da9d6da551f811a0074d48e62d8f5.pdf} } @article { author = {Ismail, M. and Ibrahim, A. and Zaghrout, A. and Younis, S. and Elmalky, F. and El-Masry, L.}, title = {STABILITY ABOUT LIBRATION POINTS FOR RESTRICTED FOUR-BODY PROBLEM}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {1-11}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86756}, abstract = {In this work, the Restricted Four-Body Problem is formulated in Hamiltonian form. The canonical form for the system is obtained which represents the equations of motion. The collinear libration points are obtained, we have five collinear libration points. The non-collinear libration points are found which are three non collinear libration points, they are obtained for different angles between the sight of Sun and the plane of Earth-Moon. The periodic orbits around each of these libration points are studied using two methods. The first method depends on the reduction of order of differential equations and the second method depends on the Eigen values of the characteristic equation. Two codes of MATHEMATICA are constructed to apply these two methods on the Sun- Earth-Moon-Spacecraft. The Poincare sections are obtained using the first method, these sections are used to illustrate the intersect points of the trajectories with the plane perpendicular to the plane of motion about each of the collinear libration points. Mirror symmetry is explored about each of these points. The Lyapunov orbits, and the Lissajous orbits about each of the collinear libration points are the results obtained by the second method. The eccentricities and the periods of each orbit are obtained. This study illustrates that the motion about the libration point L2 is more stable than the motion about any other collinear libration points.}, keywords = {Lissajous orbits,Poincare surface sections,Libration points,Stability of libration points,restricted four-body,motion near libration points}, url = {https://absb.journals.ekb.eg/article_86756.html}, eprint = {https://absb.journals.ekb.eg/article_86756_881a6f538fe698645691d84ce8054239.pdf} } @article { author = {Eid, Mز and Gad, Elsaied and Abdel Basset, H.}, title = {TEMPERATURE ANALYSIS OVER EGYPT}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {13-30}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86755}, abstract = {In this study monthly, seasonal and annual values of temperature have been analyzed over Egypt during the period 1960-2016. It is found that the temperature is a function of latitudes where the values of temperature increase gradually from north to south. The trend analysis illustrates that there is a significant increase in seasonal and annual values of temperature over Egypt. The annual wave dominates at all stations; its amplitude for the northern stations is smaller than those for the southern stations. The analysis of the spatial distribution of the monthly average of temperature (1960 – 2016) for each month of the year has been made. It is found that Latitudinal gradients in temperature are strong in winter and spring seasons with particular increase over the north of Egypt due to the effect of mid-latitude travelling depressions from west to east over Egypt. The climatological distribution of temperature throughout the months of the year reflects the effect of meteorological factors and pressure systems affecting the weather and climate in the study area. The warmest areas in summer are the middle and the south eastern parts of Egypt.}, keywords = {surface air temperature series,Annual cycle,Trend analysis,Climate variability}, url = {https://absb.journals.ekb.eg/article_86755.html}, eprint = {https://absb.journals.ekb.eg/article_86755_7cfdbfe0c04d509cbcf961ee806c7812.pdf} } @article { author = {Morsy, Mز and Abdeldym, A. and Sayad, T. and Abdel Basset, H.}, title = {DIAGNOSTIC STUDY OF DIABATIC HEATING AND GENERATION OF KINETIC ENERGY DURING INTERACTION BETWEEN TWO EXTRATROPICAL CYCLONIC SYSTEMS: CASE STUDY}, journal = {Al-Azhar Bulletin of Science}, volume = {30}, number = {2-B}, pages = {31-39}, year = {2019}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2019.86754}, abstract = {This research aims to study and discuss the diabatic heating at the different isobaric levels during interaction between mid-latitude (southward extension of 500 hPa trough) and extra-tropical (northward extension of Sudan monsoon low) cyclones over Egypt and east Mediterranean during the period 3-6 November 2015. Also, relationship between diabatic heating and kinetic energy generation were illustrated. The cyclogenesis of this case is associated with maximum heavy rainfall over northern part of Egypt during growth stage (4-5 November). Throughout the life cycle of cyclone, the vertical advection term ((T/P)) is the significant term that plays  an  important  role  in  diabatic  heating  calculation  and  opposite  to  adiabatic  term (-(/Cp)). The largest contribution of the horizontal cold advection occurs during the pre-storm stage, while the largest warm advection occurs during the growth stage. Finally, it is found also that the area of diabatic cooling (heating) is synchronized with destruction (generation) of kinetic energy.}, keywords = {diabatic heating: heavy rainstorm,Red Sea Trough,generation of kinetic energy}, url = {https://absb.journals.ekb.eg/article_86754.html}, eprint = {https://absb.journals.ekb.eg/article_86754_c8fcc5073da3b94cb9bf8c2672a1f013.pdf} }