Egyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Effects of Zn and Sb additions on micro-structure, creep behavior and thermal properties of binary eutectic Sn-0.7%Cu lead-free solder1153031510.21608/ajnsa.2019.4450.1103ENAmal MYassinPhysics department, faculty of Education, Ain Shams University.
Cairo - EgyptJournal Article20180716The effects of Zn and Sb additions on microstructure, creep behavior and thermal properties of binary eutectic Sn-0.7%Cu lead-free solder were investigated. Results show that Zn-addition reduced the melting temperature of Sn-0.7Cu and enhanced the creep resistance due to the formation of Cu5Zn8 intermetallic compound (IMC) and reduction of Cu6Sn5 phase in β-Sn matrix. Conversely, the Sb-addition showed negative effect on both the creep resistance and melting temperature compared to the plain Sn-0.7Cu and Sn-0.7Cu-2.0Zn alloys due to the formation of SnSb IMC particles and coarse Cu6Sn5 phase through the β-Sn rich phase. The average stress exponents of 4.9 - 6.0 and activation energies of 50-60 KJ/mol were obtained for three solders; suggesting that the dislocation climb controlled by lattice diffusion is the dominant creep mechanism. X-ray diffraction (XRD) analysis revealed that the lattice parameters (a), (c), the axial rate (c/a) and the peak height intensities (hkl) of some crystallographic planes are changed with alloying additions and the crystallite size is decreased.https://ajnsa.journals.ekb.eg/article_30315_3a22d3992996767f709d7e1ba6ff12cd.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Radiological hazards of TENORM contaminated soil at Oil and Gas Fields16243045010.21608/ajnsa.2019.5150.1119ENYasserAhmedRadiation Protection Department, Egyptian Nuclear and Radiological Regulatory Authority0000-0003-3085-0287RandaMahmoudRadiation Protection dep. Nuclear and Radiological regulatory authorityMOhamed RedaEzz El-DinNuclear and Radiological Regulatory AuthorityMostafaKhalilChemistry Department, Faculty of Science, Ain Shams UniversityJournal Article20180917The presence of large quantities of TENORM contaminated soil produced during the extraction and processing of oil at oil extraction sites higher than the radiological reference levels assigned by the international organizations (UNSCEAR 2000) may cause the exposure of workers at this sites to unusual radiation hazards. This is a great importance for assessing the dose to the workers at these sites, which plays a vital rule in exploring the radiation health risks due to radiation exposure.<br /> This study aims to assess the TENORM activity concentration of the contaminated soil in some oil and gas production fields at Egypt. The assessment of the radiological hazards for the workers by estimating the annual doses and the radiation hazard indices are also studied. The obtained data showed that the activity concentration of 238U, 232Th and 40K found to be ranged from166 to 42567 Bq/Kg, 88 to 8358 Bq/Kg and 52.22 to 440Bq/Kg respectively. The calculated absorbed dose rate ranged from 132.39 – 24732.67 nGy/h, the calculated Annual Effective Dose Equivalent ranged from0.16 – 30.33 mSv/y (depending on the activity concentration of NORM contamination). The radiation hazard indices is calculated and found to be much higher than the international values.<br /> From the obtained results, it has concluded that the remediation/decontamination of the contaminated soils at the production sites that have high activity concentration is highly recommended. In addition, Egyptian regulations must be coherent to force companies to decontaminate the NORM contamination in order to reduce as much as possible the radiation worker exposure.https://ajnsa.journals.ekb.eg/article_30450_879bf6774637cf5f7c7b067d3dea759f.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Modeling of Passive Safety Thermosyphon Loops Cooling System for Nuclear Applications25333744910.21608/ajnsa.2019.3357.1075ENMohamadSalemDepartment of Nuclear Safety research and Radiological emergencies &ndash; NCRRT center,
Egyptian Atomic Energy Authority, Cairo, EgyptHesham HasaneenElkhatibbNuclear reactors department, NRC Center,
Egyptian Atomic Energy AuthorityMohamed AbdelmoneamGaheenDepartment of Nuclear Safety research and Radiological emergencies – NCRRT center,
Egyptian Atomic Energy AuthoritySaid HussienZoalfakarThe higher technological InstituteJournal Article20180402Abstract: Heat pipes are passive heat transfer devices, with very long lives. Material and testing reactors (MTR) have residual heat after shutdown. Also they have an auxiliary spent fuel tank that also have heat generated need to removed, also heat should be removed in case of emergency to keep fuel temperature within safe limit. A gravity assisted two-phase closed heat-pipe loop (GTPHL) with evaporator and condenser lengths each 100m helical coil shape with outer diameter 15 cm and 3 mm thickness as a passive cooling system for a nuclear spent fuel storage pool is used to remove this heat. This paper presents and proposes a completely passive cooling system using loop thermosyphon for cooling and dissipation the residual heat of wet spent fuel storage by running as main or alternative cooling system. The design is focus on heat removal from the auxiliary spent fuel tank of the research reactor to be in safe mode. The model considers natural convection by air for the condenser part of the heat-pipe loop to confine the residual heat. A numerical simulation using special design of gravity assisted two-Phase closed heat-pipe loops were used to investigate the (GTPHL) thermal performance. The effects of heat loads were analyzed. Demineralized water was used as the (GTPHL) working fluid. The atmospheric air was circulated around the condenser as a cooling system. The effect of heat input (25kW≤Q≤150kW) working fluid filling ratio (100%) The results show that the best thermal performance was obtained at high evaporator heat load.https://ajnsa.journals.ekb.eg/article_37449_8c1c017d8ada575b70f1c5ccd802d423.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701PID Controller Adjustment using Particle Swarm Optimization for Multi-Area Load Frequency Control Said A. Kotb Magdy M. Z. Abdelaal Ahmed R. Adly ETRR-2,Nuclear Research Center, Atomic Energy Authority, Egypt34423745110.21608/ajnsa.2019.4923.1114ENMagdy MahmoudZakyETRR-2, EAEA, EgyptAhmed RamadanAdlyETRR-2, EAEASaid AbdouSabryETRR-2, EAEAJournal Article20181201This paper present particle swarm optimization based study of multi area power network. Particle swarm optimization and Fuzzy system inferences have been employed to effectively obtain the optimized gains of PID controller. Any change in the load demand causes generator’s shaft speed lower than the pre-set value and the system frequency deviates from the standard value results in malfunctioning of frequency relays. A three area load frequency model is constructed in Matlab/Simulink by implementing the PID controllers to control the frequency deviation on the three areas together and each area to illustrate the effect of frequency deviation on the integrated model. One of these areas is a nuclear power plant. Performance of the proposed controller is compared with fuzzy system based PID controller and conventional PID controller to indicate the excellence of the proposed algorithm for PID parameters regulation. Simulations performed show the effectiveness of the current approach over simple fuzzy inferences in terms of performance as well as execution efficiency.https://ajnsa.journals.ekb.eg/article_37451_43fe8a770319e1b356de847656e418f7.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Preparation and Evaluation of 177Lu-TDTMP: A Potential Theranostic Agent for Bone Metastases43553745310.21608/ajnsa.2019.5151.1118ENHananTalaatAss.professor -labelled compounds-Hot Labs centerJournal Article20180917177Lu was produced in high-specific activity and excellent radionuclidic purity by thermal neutron bombardment of 176Yb target.Tetramethylene diamine tetramethylenephosphonic acid (TDTMP) was radiolabeled with 177Lu and complexation parameters were studied and optimized: 8.4 µg TDTMP, ~243 Ci of 177Lu activity, pH= 8 and the reaction mixture was kept at room temperature for 30 min.The complex, formed with high yield (>99%) and retained its stability for more than 14 days. The complex structure was predicted and its binding to target enzyme was assessed in-silico..Biodistribution study carried out in normal and tumorized Wister rats showed significant skeletal uptake, the 177Lu-TDTMP, results clearly indicated that it has high affinity for bone mineral. Femur and tibia uptakes of the labelled complex were ~ 6.4 % and ~7.1 % at 3 hours post injection compared to ~ 4 % and ~ 4.3 % in case of 177LuCl3. Thereafter, the uptakes increased continuously to a maximum of ~ 7.9 % and ~ 8.3 % at 48 hours after injection were noticed.https://ajnsa.journals.ekb.eg/article_37453_7f85be353bff0bc22173f8c520e7a10d.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Determination of Radioactivity Concentration and Assessment of Absorbed Effective Dose of Edible Plant and Soil Samples56633745510.21608/ajnsa.2019.5754.1132ENMohammedElywaPhysics Department, Faculty of science,Zagazig University, Zagazig, EgyptJournal Article20181024The aim of this study is the determination of radioactivity concentrations of naturally occurring of K-40, U-238, and Th-232 and assessment of annulling effective dose of edible plant and its soil samples. The activity concentrations in soil and plant samples were measured using Hp Ge-Detector and analyzed using Genie2000 software. The radium equivalent, annual absorbed effective dose, indoor, outdoor absorbed dose and hazard index (Hex, Hin and Iɣ) have been estimated for workers. The present study has shown that both the uptake and the activity concentrations of U-238 and Th-232 were significantly low in comparison to K-40 radionuclide in soil and edible plant samples. Interestingly, the results of this research have demonstrated that soil and plant samples that have been collected from Sharqia governorate are exhibited low activity concentration of radionuclides. Moreover, this decline in the activity concentration of radionuclides is under the worldwide values [1]. Taken together, our results of Radium equivalent, annual absorbed effective dose, indoor, outdoor absorbed dose and hazard index (Hex, Hin and Iɣ) provide compelling evidence that the soil has low U-238, Th-232, and K- 40 concentration. Thus, it is tempting to conclude that and it is safe for agriculture. Based on my data, it is tempting to conclude that no health risk for eating these edible plants.https://ajnsa.journals.ekb.eg/article_37455_8802d909a75512f9b7f11e8cf4297a7d.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Therapeutic Role of Curcumin Loaded Magnetic Nanoparticles Against Gamma-Irradiation Hazards in Rats64733745710.21608/ajnsa.2019.7083.1167ENHussein AliAbdelmaksoudDepartment of Biochemistry and clinical Biochemistry, Faculty of Veterinary Medicine, Benha UniversitySamy AliHusseinDept. of Biochemistry and Clinical Biochemistry, Faculty of Veterinary Medicine, Benha, Tokh, EgyptHisham MounirSalehDepartment of Biological Applications, Nuclear Research Center, Atomic Energy Authority, EgyptWalaaHassaninDept. of biological applications, Nuclear Research Center, Egyptian Atomic Energy Authority, Egypt0000-0001-8458-9155Eman IbrahimSobehDepartment of Biological Applications, Nuclear Research Center, Atomic Energy Authority, EgyptJournal Article20190111The present study has been carried out to investigate the possible therapeutic effect of curcumin loaded iron oxide nanoparticles (MNP-CUR) administered through intrapretoneal (i.p) injection after whole body gamma irradiation of rats. Whole body gamma irradiation of rats at 6 Gy (single dose) caused significant reduction in red blood cells count, hemoglobin levels, lymphocytes, neutrophils, and monocytes associated with highly significant elevation in malondialdehyde (MDA). The reduction in catalase (CAT) activity and the reduced levels of glutathione GSH were observed after three weeks post-irradiation. Administration of MNP-CUR after irradiation resulted in significant improvement of the hematological parameters and reduced changes in MDA, GSH and CAT levels were induced by gamma irradiation. The combination of MNP and CUR was found to be of advantage for after exposure treatment because the effect of radiation is stealth. That is an individual may spend days, weeks or even months exposed to radiation doses without becoming alarmed. Exposure to ionizing radiation is known to have an effect on the body cells, especially the blood cells and cause marked decline in their viability and proliferation.https://ajnsa.journals.ekb.eg/article_37457_04adfd2d9abacd9068853d7762f573e6.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Extraction of Some Rare Earth Elements (La, Pr and Er) from Citrate Medium Using D2EHPA in kerosene.74853338710.21608/ajnsa.2019.11545.1202ENElsayedMustafaE.A.E.AZeinabHasanienE.A.E.A0000-0002-9634-3096YasserEl-NadiHot Laboratories Center, Atomic Energy Authority, 13759, Egypt0000-0003-1889-4981SaadM. AbdelwahabbAin Shams UNIHisham FouadAlyEgyptian Atomic Energy AuthorityJournal Article20190404Extraction and possible separation of the rare earth elements, REEs, lanthanum (III), praseodymium (III) and erbium (III) from citric acid solution using Di-2-ethylhexyl phosphoric acid, D2EHPA, in kerosene were studied. The parameters affecting the extraction process were separately studied in order to achieve the maximum possible separation between the different REEs under investigation. It was found that from 1.0 mol/L citric acid solution at pH = 4.0 , the extraction is dependent on the citric acid and D2EHPA concentration as well as temperature. From the experimental results and the main species in the aqueous phase, aproposed extraction equilibrium for the different metal ions was given. Conditional extraction constants for the proposed extraction equilibrium were calculated for the different elements, and found to verify the experimental results. The order of the conditional extraction constants follow the sequence, Er (III) > La (III) > Pr (III). The thermodynamic functions associated with the extraction reaction were evaluated and discussed. Feasibility of separation of Er(III) from La (III), and Pr (III) obtained are given in terms of the separation factors between different elements at different extraction conditions.https://ajnsa.journals.ekb.eg/article_33387_b7970adc60e5c075d5ea84139b156ea3.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Landau damping of acoustic waves at the effect of variable dust size and charge of plasma dust grains86893447010.21608/ajnsa.2019.5490.1125ENAtef AhmedElbendaryphysics department, faculty of science, tanta universityJournal Article20181005Landau damping is a phenomena observed in plasma wherein there is an exponential decay in the oscillations of the number density of electrons in a plasma, Collisionless damping of electrical waves in plasma is investigated in the frame of the classical formulation of the problem. The effect of variable dust size and charge on the Landau damping of acoustic waves is studied in presence of hybrid nontheremal nonextensive electrons. Based on the kinetic theory, landau damping of dust acoustic waves (DAWs) propagating characteristics in a dusty plasma with negatively charged dust grains and Maxwellian ion distribution is investigated using Vlasov – Poisson`s equations. The charging of dust grains is described by the orbital-motion-limited theory and the size of the dust grains obeys the power law dust size distribution. the dependence of the wave frequency 𝜔 on the difference between the largest and the smallest dust radius for different wave numbers are plotted, also Phase diagram of the Landau damping as a function of both the grain radius of dusty plasma and the wave number are plotted, there are three different regions in the diagram.The present study is useful in the space situations where such distribution exists.https://ajnsa.journals.ekb.eg/article_34470_a860d0ab7879f3483f14751459bb3075.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701CPRD Supplied With Native Scintillator for Radon Gas Detection90973447110.21608/ajnsa.2019.5723.1130ENAyman MohamedAbdallaNajran university, Najran, KSA
najranJournal Article20181018For neutron detection and radioactive gas sensing, it is greatly beneficial to detect alpha (α) particles and gamma rays. In present work, continues passive radon detector (CPRD) has been constructed with native ZnS; Ag.Cl scintillator. The detector has been supplied with high efficient native nano particles scintillator for detection α particles. One of the features of this scintillator, the energy resolution is comparable with or even better than commercial ZnS(Ag) scintillator. This study provides an alternative for fabrication the native scintillator in absence of costly scintillator available in the market. Moreover, results of scintillation characteristics, along with physical properties of the scintillator are addressed and thoroughly discussed. For calibration, radon calibration system with dual radon monitor has been constructed in Najran University, Saudi Arabia. The experimental sensitivity of the passive CPRD cell for radon gas detection was constant with well know data already published in the literatures. Radon emission from natural sample has been measured by the fabricated CPRD cell.https://ajnsa.journals.ekb.eg/article_34471_6c2ae5fcc1afd3798e0fe05696df43e7.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701On the question of spin assignment and quantized alignment in the A~ 100-140 superdeformed mass region981143447210.21608/ajnsa.2019.6023.1133ENAhmed SayedShalabyPhysics department - faculty of science- Beni-suef University.0000-0002-4140-0903Journal Article20181101The structure of the superdeformed (SD) mass region, A~ 100-140 is re-studied by using a direct approach based on the rotational energy formula E (I, K). To determine the lowest spin (If) and the K-value of the considered SD bands; namely, 104Pd(b1), 132Ce(b1), 134Nd(b1), 136Nd(b2), 142Sm(b1), 148Eu(b1, b2), 131Ce(b1, b2), 133Ce(b1, b2), 133Pr(b1, b3), 137Sm(b1) and 143Eu(b1), we study the dependence of the dynamic, (2) and static, (1) , moments of inertia on the rotational frequency (ℏω). Using a search method, the higher order inertial parameters A and B of such method were determined by fitting the proposed transition energies with their observed ones. The calculated transition energies are strongly dependent on the identified spins. It was found that, when an accurate bandhead spin (I0) is assigned, a good agreement is achieved between the calculated and observed transition energies. The results for the spin are in satisfactory agreement with other theoretical results and available experimental data. A good agreement between the calculated and corresponding experimental transition energies of the SD bands is obtained which supports our methodology. The incremental alignment and also the angular momentum alignment, for the identical SD bands exist among the considered ones, have been studied and the results verified well Stephens’s law of alignment.https://ajnsa.journals.ekb.eg/article_34472_db8c1e6279cec18e586b436c63691b74.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701First Trial to Assess Gamma-Irradiation and Diatomaceous Earth Combination on Mortality of some Stored Product Insects1151203447310.21608/ajnsa.2019.6159.1134ENThanaaSileemBiological Application Department-Nuclear Research Center-Atomic Energy Authority. P.O.Box 13759, Abo-Zaabal, Egypt0000-0002-5560-4317SamiaMohamedBiological Application Department-Nuclear Research Center-Atomic Energy Authority. P.O.Box 13759, Abo-Zaabal, EgyptAshrafMehanyPlant Research Department- Nuclear Research Center -Atomic Energy Authority. P.O.Box 13759, Abo-Zaabal, EgyptJournal Article20181110This study was designed to characterize the combination of gamma-irradiation and food grade diatomaceous earth (Wolf Creek ranch, California, USA) as diatomaceous earth formulation treatment against three of stored product insect pests [Sitophilus granarius (L), Tribolium castaneum (Herbst.) and Rhyzopertha dominica, (F)] in the laboratory. The study was assessed the killing effect of gamma-irradiation at 50,100 and 250 Gray against these pests. As well as 0, 0.5, 1.0 and 1.5 g/kg (w/w) concentrations of diatomaceous earth formulation alone or in combination with irradiation were assessed. The obtained results indicated that the mixing between two insect control methods had the combined advantages of quick speed of killing and a high level of safety. Where, the LT50 have a wide range of values and the combined treatments of gamma-irradiation and treatment with diatomaceous earth maybe were the most influencing factors reducing lifespan after treatments. In this laboratory study the combination between diatomaceous earth (1.5 g/kg) and irradiated the tested pests with (250 Gy) of gamma ray produced an antagonistic interaction, except in the case of Rhyzopertha dominica F. adults. Our finding stated that the use of ‘control method’ gamma-irradiation in conjunction with diatomaceous earth could be a feasible strategic component in Insect Pest Management; IPM in operational modality might be ‘sequential’ against the tested pests. That is to apply irradiation to eliminate existing census personnel. This is then followed by the addition of DE to the grain to prevent the infection from occurring againhttps://ajnsa.journals.ekb.eg/article_34473_2cb79e3e697f1fbd08710ad6e5143d10.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Hot Quantum Electron-Ion-nonmagnetized Dusty Plasma: ion sound waves and dispersion relation.1211253447410.21608/ajnsa.2019.6631.1152ENAtef AhmedElbendaryphysics department, faculty of science, tanta universityJournal Article20181212Abstract: The dispersion equation for isothermal ionic sound waves is derived and analyzed for collisionless nonmagnetized dusty plasma consisting of quantum gases of electrons, ions, and dust at hot temperatures. and an exact expression is obtained for the linear velocity of ionic sound. Analysis has been carried out by the method of the Bernoulli pseudopotential. The quantum effects include, Fermi degenerate pressure, and exchange correlation potential. The ranges of phase velocities of periodic ionic sound waves and soliton velocities are determined. It is shown that in the plasma under investigation, the soliton velocity cannot be lower than the linear velocity of ionic sound. A graph should plotted between the frequency and wave number, three region should obtained, solutions in the form of periodic ionic sound waves should be sought precisely in the range of velocities The profiles of physical quantities in a periodic wave and in a soliton are constructed, as well as the dependences of the velocity of sound and the critical velocity on the ionic concentration in the plasma. It is shown that these velocities increase with the ion concentration and the term of dusty plasma as well as term of hot quantum electron and ion may effect on the dispersion relation. The application of this work has been pointed out for laboratory as well as for space dusty plasmas.https://ajnsa.journals.ekb.eg/article_34474_8a61d76f0d0b0bde545fbcb890cbcbc1.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701A Tamper Proofing Text Watermarking Shift Algorithm for Copyright Protection1261333447510.21608/ajnsa.2019.6694.1156ENAmira EidAfifyComputer and Electrical Engineering, HTI, 10th of Ramadan City, Al-sharkia, Egypt.0000-0001-5872-5221AhmedEmranCommunication and Electronics Engineering , Al-Azhar university Cairo , Egypt.AhmedYahyaCommunication and Electronics Engineering , Al-Azhar university Cairo , Egypt.Journal Article20181216Watermarking has proved its great reliability and flexibility for property rights protection and tamper detection of diverse forms of online distributed data. Among the different mediums in which watermarking technology is used, text watermarking represents the most challenging issue due to the distinctive nature of its various formats. Plain text is widely used for transferring information on the internet. Despite this, there is a lack of used plain text watermarking techniques, so obviously it’s necessary to focus on that point and pay it more attention. In this paper a blind text watermarking approach is proposed for copyright protection and tamper detection of plain text by inter-word spacing (depending on a secret binary number and a key word) and text fingerprint through using MD5 hash function. Simulation results proved the success of our approach in detecting any tiny content tampering and due to the secret key and the fingerprint of watermarked text copyright protection are accomplished efficiently. This approach is a combination of several steps which work cooperatively to reach the desired goals.https://ajnsa.journals.ekb.eg/article_34475_adb38ff23572a4e3794b87c5853ecc8e.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Electrical Characteristics, Plasma parameters and Reaction Rates of DC O2 Plasma1341433447610.21608/ajnsa.2019.6818.1161ENOmar FaragFaragZagazig University, Faculty of Science, Physics Department, Zagazig, Egypt0000-0002-6423-7790Journal Article20181224The electrical characteristics of DC oxygen (O2) plasma such as discharge current-voltage (I-V) curves and breakdown voltage of oxygen gas were measured. The plasma parameters such as electron temperature (Te) and density (ne) were obtained using Langmuir probe at constant power over a wide range of O2 gas pressures. The measured Te values used to calculate the various rate coefficients for electron impact (ionization, dissociation and excitation) from ground state of O2 molecules. Thereafter, the calculated rate coefficients and the measured ne were used to calculate the rates of ionization, dissociation and excitation from ground state of O2 molecules. The I-V measurements of the discharge and Paschen curve show that the operating voltage was decreased with increasing O2 gas pressures at constant current and the minimum of Paschen curve was found to be 400 V at Pd = 1.86 mbar.cm, respectively. The Te showing decreasing trend with increasing O2 gas pressures while ne showing increasing trend. The rate coefficients of ionization, dissociation and excitation were found to decrease with increasing O2 gas pressure. Contrary, the rates of ionization, dissociation and excitation were found to increase with increasing O2 gas pressure.https://ajnsa.journals.ekb.eg/article_34476_12a75fe0e1ba4ebe59fc22f366122694.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Fault Detection for Multi-terminal Transmission Line with Nuclear Power Plant Based on Wavelet Transform Ahmed R. Adly(1),*, Alaa M. Abdel-hamed (2), Said A. Kotb (1), Magdy M. Zak (1) 1) ETRR-2, Nuclear Research Center, Atomic Energy Authority, Egypt 2) High Institute of Engineering, EL Shorouk Academy, Egypt1441523447710.21608/ajnsa.2019.6832.1162ENMagdy MahmoudZakyETRR-2, EAEA, EgyptSAID AbdouKotbAtomic energy authoirtyAhmed RamadanAdlyETRR-2, EAEAJournal Article20181225Abstract-This paper proposes an improved scheme of fault detection and classification for multi-terminal transmission lines using discrete wavelet transform (DWT). The proposed scheme can correctly used to detect and classify the faults. The proposed scheme is dependent on line current data only. The proposed scheme is derived in the spectral domain and is based on the application of the DWT. The proposed scheme uses an adaptive threshold level for detect and classify the faults. The ATP/EMTP program is used to evaluate the presented approach. In addition, the nuclear power plants planned to be integrated with the Egypt electric network in 2026, so the presented approach is considered the installation of El Dabaa nuclear power plant. The presented approach achieves accurate results under numerous and enhanced fault detection and classification methodologies. The proposed methodologies have been applied correctly and verified a good contribution in detection and classification of electrical network faults.https://ajnsa.journals.ekb.eg/article_34477_27160d5d74751a5d9c27c37f4aff8f42.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Effect of Poly Vinylidine Addition on Structural and Electrical Properties of Nickel Zinc Ferrite1531683744010.21608/ajnsa.2019.5034.1116ENBasantSalemDepartment of Physics, Faculty of Science, Tanta University, Tanta , EgyptOsamaHemedaPhysics department, Tanta UniversityAbdElraoufTawfikPhysics Department, Faculty of Science, Tanta University, EgyptMohammedMagdiPhysics department, TantaJournal Article20180904Samples of Ni0.3Zn0.7Fe2O4 and composite films of x% Ni0.3Zn0.7Fe2O4 /PVDF, (x%=5, 10, 15, 20 and 25%) were synthesized by high energy ball milling. The sample milled at 90 hour shows that the intensity peaks of initial oxides reduced during ball milling process and completely disappeared by annealing to 1373 K. There are 2 peaks at (2θ = 18.6 and 27°) corresponding to planes (020) and (021) which are attributed to α- phase of (PVDF) where β-phase of PVDF is characterized by the peaks at (2θ = 20.8°) corresponding to the (110) planes. The phase transformation from the non-polar α-phase to the polar electroactive β-phase of PVDF by increasing NZF content has been investigated by XRD analysis and FTIR spectroscopy. The DC resistivity of the composite samples at room temperature reaches maximum at 5% NZF, above this ratio it begins to decrease. The dielectric constant and dielectric loss were studied at constant frequency.https://ajnsa.journals.ekb.eg/article_37440_bdd2b4591e5423afa3b7cf309d7c1399.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Formation of Porous Nanostructure Cobalt Oxide Electrodeposits on Stainless Steel 304 Surface Used as Solar Absorber1691803744210.21608/ajnsa.2019.5690.1142ENAhmed MohamedRaslan319 Al Shabab St
20000-0002-5622-1115Moataz MohamedNabileMetallurgy Department, Faculty of Engineering, Cairo UniversityAbdel Aziz FahmyWaheedMaterials Division, Metallurgy Department, Nuclear Research Center,
Atomic Energy Authority, Cairo, EgyptRanda Abdel KarimMohamedMetallurgical Department, Faculty of Engineering, Cairo University, Giza, EgyptJournal Article20181126Cobalt oxide layers was formed on a stainless steel type 304 surface after annealing heat treatment (400 oC / 10 hr) of the previously electrodeposited pure cobalt coating. The influence of heat treatment on surface morphology of pure cobalt films deposited has been studied. Crystallite structure transformation from hexagonal system to cubic system occurs. The coating layer morphology change from nano platelets to nano flecks was observed. SEM and EDAX are used for monitoring the gradually changes in the coated surface and nanostructure formation behavior. The degree of crystallitey and crystallite size changes, due to annealing at 400 oC/10 hrs, was measured by using XRD device. The optical properties were investigated by using UV-IR Spectrometry to study the effect of the formed surface coating at different electrodeposition conditions on the solar energy absorption behavior. The optimal solar absorptance was 98% at visible light wavelength range (400- 750 nm) for the films after annealing heat treatment.https://ajnsa.journals.ekb.eg/article_37442_b8ea1fb7b8cbc30c58a5ba289d6096aa.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Influence of Some Electrodeposition Parameters on Formation of Nanostructure Black Cobalt Coating used for Solar Energy Absorption1811953744310.21608/ajnsa.2019.6188.1143ENAhmed MohamedRaslan319 Al Shabab St
20000-0002-5622-1115Journal Article20181126Electrodeposition of nano cobalt on a stainless steel 304 substrate using for solar energy absorber was established. Two different electrolytic bathes used in this investigation. The first bath composition is [270 g/l CoSO4, 35 g/l CoCl2, and 30 g/l H3BO3], and the second was used as the previous with addition of 2.5 g/l Co(NO3)2. The role of nitrate ions as an oxidizing agent was investigated. Different current densities (20 and 30 mA/cm2) are applied. Deposition times from 1 to 6 minutes for each current density were used. Crystal structure transformation and morphology changes were investigated for coatings at all electrodeposition conditions. SEM and EDAX are used for monitoring the gradually changes in the coated surface and nanostructure formation behavior. The degree of crystallitey and crystallite size changes was measured by using XRD device. The optical properties such as absorption and reflectivity were investigated by using UV-IR Spectrometry to discover and compromise the effect of applied electrodeposition conditions on the solar energy absorption of the formed surface coating.https://ajnsa.journals.ekb.eg/article_37443_cf7c0dd88ef834d026e33487f351f94d.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Structural, AC conductivity and dielectric properties of bulk 1,3-Dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-[3H]naphth[2,1-b][1,4]oxazine]1962033744410.21608/ajnsa.2019.6373.1141ENW MDesokyPhysics Dept.-Faculty of science- Zagazig universityJournal Article20181125The frequency dependent of the AC conductivity and Dielectric properties of organic compound 1,3-Dihydro-1,3,3-trimethylspiro [2H-indole-2,3′-[3H] naphth [2,1-b] [1,4] oxazine], SPO, have been studied as a bulk in a frequency range (50 Hz–5 MHz) with different temperature. X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) suggest that the SPO compound has polycrystalline with monoclinic structure, space group P21 along with crystalline size around 35 nm at room temperature. The obtained results of AC conductivity, σ (ω), increased with increasing frequency. Consequently, the exponent frequency factor, S, was estimated and found to be S < 1 and increase with increasing temperature. This behavior indicates that the small Polaron (SP) model is the most predominated conduction mechanism. The dielectric properties including dielectric constant, dielectric loss and loss tangent were found to be decreased with increasing frequency, while these parameters are increased with increasing the temperature in the investigated ranges. Moreover, the activation energy, the relaxation time and the maximum barrier height were extracted.https://ajnsa.journals.ekb.eg/article_37444_b29ac3edabbe39fea89e2740ac3345b6.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Kinetic & Thermodynamic Studies on Uranium Ions Recovery Using Magnetite- Dowex 50WX8 composite2042203803610.21608/ajnsa.2019.7325.1171ENLamiaYousefNMA, P.O. Box 530 El Maadi, Cairo, EgyptJournal Article20190117Batch Experiments on synthesized "Magnetite-Dowex 50WX8" composite were conducted to characterize its capability towards uranium adsorption. The effect of pH, contact time, composite dose, initial uranium concentration and temperature on uranium adsorption rate was investigated to optimize operation conditions of the synthesized composite. Thermodynamic and kinetic parameters have been studied. The maximum sorption capacity from Langmuir reached up to 200 mg/g at room temperature, pH 4, 25 mg of composite and 30 min. contact time. Uranium adsorption kinetics is well fitted to pseudo second order kinetic model at 500 mg/L uranium concentration. The change in thermodynamic parameters (ΔG, ΔH and ΔS) indicates that the adsorption process is a spontaneous exothermic random process. Loaded hexavalent uranium ions were stripped from the loaded composite using 0.25M nitric acid. Optimum conditions were applied to purify dissolved uranium content from a leaching solution of a granite sample from El-Missikat area, Central Eastern Desert, Egypt.https://ajnsa.journals.ekb.eg/article_38036_ac3f9c758013db5d8dd47e4758cb1730.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Prediction of Potential Dose Metrics for the Estimation of Health Effects due to Occupational Exposure in Samalut city, Egypt2212313804510.21608/ajnsa.2019.7565.1173ENMonaMoustafaPhysics department, faculty of science, Minia university, El-Minia,EgyptImreBalásházyCentre for Energy Research, Hungarian Academy of Sciences, P.O. Box 49, Budapest H-1525, HungaryJournal Article20190123Potential dose metrics for the estimation of health effects including mass deposition fractions, mass deposition rates and mass deposition density rates were computed with a stochastic lung model based on the measured size distribution of elemental aerosols in the industrial area of Samalut in El-Minia (Egypt). Deposition was calculated for different physical activity levels; sitting, light and heavy exercise. The highest mass deposition fractions were observed in the extrathoracic region, while deposition in bronchial and acinar regions was consistently smaller irrespective of the chemical species. This difference between extrathoracic and lung regions was further exacerbated in the case of mass deposition density rates due to significant differences in related surface areas. Mass deposition fractions and mass deposition rates increased with airway generation number, reaching a maximum in the acinar region, while mass deposition density rates dropped significantly from the maximum in the large bronchi to the distal acinar airways. Mass deposition rates and deposition density rates increase with physical activity and thus are highest for heavy exercise breathing conditions. Mass deposition density rates suggest that the bronchial region is the primary target for health effects of inhaled particles.https://ajnsa.journals.ekb.eg/article_38045_4d77837384579886a272da925dd4cba7.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701The effect of the interface on magnetic properties of perovskite-spinel nanocomposites2322413804610.21608/ajnsa.2019.7827.1176ENE. H.El-KhawasHigher Technological Institute 10th of Ramadan cityJournal Article20190131In this research, perovskite-spinel nanocomposite with formula (x)(Cuo.3Mn0.7Fe2O4)- (1-x)(La0.9o Bi0.10 FeO3); 0 ≤ x ≤ 1, were prepared by the auto-combustion method. A single phase of orthorhombic and cubic structure for La0.9oBi0.10FeO3(LBFO); Cuo.3Mn0.7Fe2O4(CMFO) respectively have been proved for two parents and nanocomposites without any further secondary phase using XRD analysis. High-resolution transmission electron microscopy (HRTEM) images reveal nearly spherical nanoparticles for the parents and agglomerated for nanocomposites. Magnetic hysteresis loops demonstrate ferromagnetic (FM) behavior for the spinel compound and nanocomposite, where LBFO possesses G-type antiferromagnetic (AFM). Competition between FM and AFM phases lead to enhancement in magnetic parameters such as saturation magnetization (Ms), remnant magnetization (Mr) and coercivity (Hc). The magnetic properties at low temperatures show the decrease in magnetization and coercivity with increasing the temperature while the magnetic exchange bias HEB was increased until T=200 K and then decreased. The existence of intergranular magnetostatic interactions between the LBFO and CMFO interact at the interface of nanocomposites and play a decisive role in strain energy, exchange energy, and magnetic anisotropyhttps://ajnsa.journals.ekb.eg/article_38046_14ac22c1468217ca87caa3dd8fa98d06.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Deformation and fracture behavior of bicrystal graphene: an atomic level simulation2422483804710.21608/ajnsa.2019.6677.1155ENAhmed Tamer AlMotasemAlAsqalaniPhysics Department, faculty of Science, Assiut University, Assiut, Egypt0000-0003-0205-0178AhmedSedkyPhysics Department
Faculty of Science
Assiut UniversityJournal Article20181215In this study, extensive molecular dynamics simulations were carried out to investigate failure processes along different symmetric tilt grain boundaries (STGB) of bicrystal graphene sheet. Two different types of STGBs graphene mainly zigzag and arm-chair types were investigated. The dependence of fracture strength, strain as well as Young’s moduli on different STGBs were examined. The results clearly show that pristine graphene has the highest values of fracture strength and strain to fracture. Furthermore, bicrystal graphene with zigzag-oriented grain boundaries have improved mechanical properties in comparison to those with arm-chair oriented grain boundaries. Fracture behavior was investigated by applying mode I loadings to the outer boundary of bicrystalline graphene sheet with several misorientation angles. The critical stress intensity factors (SIFs) are calculated as a function of displacement were determined by using crack-tip opening displacements (CTOD) at the incipient bond breaking. The atomistic results show that the crack propagation along armchair-orientation grain boundaries are faster than that of zigzag-orientation grain boundaries of bicrystal graphene.https://ajnsa.journals.ekb.eg/article_38047_14e31e71768aeb626c26e0ee7bd7e9ca.pdfEgyptian Society of Nuclear Sciences and Applications (ESNSA)Arab Journal of Nuclear Sciences and Applications1110-045152320190701Relative study between the exposures of 6MeV photons and 0.3 mT-50 Hz magnetic fields in rat's liver2492583529510.21608/ajnsa.2019.4242.1099ENMaiElkalioubyPhysics & Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt0000-0003-3595-646XJournal Article20181216Effect of 0.3mT-50Hz magnetic field exposure on rats' liver dielectric relaxation was studied. Animals were exposed similar to occupational workers 8h/day for periods from 1 to 4 weeks the exposure effects were monitored relative to the effect of exposure to high energy 6MeV standard dose of 1 rad. Dielectric relaxations in frequency range up to 8MHz carried out immediately for all animals from each group to examine bioelectrical changes in liver relative permittivity, conductivity, and dielectric loss. The results indicated significant difference in dielectric characteristics due to the counter-ion diffusion at frequency up to 1MHz, whereas frequency increased the shift unremarkably noticed. Unveil to the data of relative fraction of damage (RFD), it insight remarkable damage due to magnetic fields in a manner it should not be less important than high energy photons. Significantly, animals of 1 week magnetic field exposure showed maximum damage effect by 15%, 26% and 5% damage in relative permittivity, conductivity and dielectric loss respectively more than 6MeV photons exposure. Relative to unexposed group the samples from 1 week magnetic field exposure confirmed liver bioimpedance results and indicated significant increase in enzymatic levels by 20.6%, 17.1%, 3.32% and 13.1% for SGOT, SGPT, TP and MDA respectively. The former results may reflect the animal body self-adaptation as exposure period increased. It is worthy to mention that this work is an important one that correlates between the effects of both extremely low frequency fields and ionizing radiation.https://ajnsa.journals.ekb.eg/article_35295_8ae9b530381ee22bedcd0aa5c0f0ad59.pdf