Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Mathematics, Statistics, Computer Science, Physics and Astronomy (12)
- Chemistry (8)
- Earth science (5)
- Botany, Microbiology and Zoology (4)
- ASTER; Band Ratio; Fluorite Index; FI; Gabal Abu Diyab (1)
-
- Alginate; Column; gamma; modeling (1)
- Antimicrobial; Cytotoxicity; MTT (1)
- Atmospheric drag; Oblate Earth; Cowell’s Method; Average Method; Low Earth Orbit (LEO) (1)
- Atmospheric pressure; Pin to Plate; Stabilized (1)
- Bentonite; swelling; lime waste; chemical stabilization (1)
- COVID-19; Epidemiology; Reproduction number; stability; Nonlinear incidence rate; isolation (1)
- Chitin; Chitosan; Uranium adsorption; Kinetics; Regeneration (1)
- Chitosan; Adsorption; Electrochemical sensitivity; Hydrogen sulfide (1)
- Chitosan; Lauric Acid; Stearic acid; Linoleic acid; ciprofloxacin (1)
- Cotton leaf worm; Plant extracts; Plant oil; Agron 10% (1)
- Distributed systems (1)
- Dromedary camel; Epididymal sperm; Morphology; viability; season (1)
- Electrochemical sensor; Solvation; Cyclic voltammetry; nalbuphine (1)
- Gindi; Mubarak; Qarun; Wrench; petroleum system (1)
- Industrial Wastewater; Electrodialysis technology; Heavy metals; Anion membrane; Cation membrane (1)
- Intrusion Detection; Signature-based detection; Anomaly-based detection; Machine Learning; Big data (1)
- Keywords: Doxorubicin; hematology; Liver functions; kidney functions (1)
- Marshall-Olkin extended Burr Type X Distribution; Type II censored samples; Two-sample prediction; maximum likelihood estimation and prediction (1)
- Moments of Inertia; Energy Staggering; Signature Partners; SD Bands (1)
- Nephthea elatensis; Sinularia hirta; Soft corals (1)
- Petrophysics; Petroleum Geology; Nubia Formation; Esh El Mallaha Field; Gulf of Suez (1)
- Positive position feedback controller; multiple scale perturbation method; response equation; primary resonance case; external force (1)
- Pulse propagation; semi-classical approach; Maxwell Bloch equations; non-linear equations; density matrix (1)
- Qubit; electron spin; Graphene; exchange interaction (1)
- Radioiodine-131; Internal dosimetry; Monte Carlo; Well Differentiated Thyroid Cancer (1)
Articles 1 - 29 of 29
Full-Text Articles in Life Sciences
Petroleum System Of Gindi Basin And Mubarak Sub-Basin, Qarun Concession, Western Desert, Egypt, Mostafa Hussien, Tharwt Abdel Hafeez, Mohammad Fathy, Mohammad El Ghamry
Petroleum System Of Gindi Basin And Mubarak Sub-Basin, Qarun Concession, Western Desert, Egypt, Mostafa Hussien, Tharwt Abdel Hafeez, Mohammad Fathy, Mohammad El Ghamry
Al-Azhar Bulletin of Science
The study area is located to the west-southwest of Cairo, which includes Qarun and East Bahariya Concessions. Two main prolific sedimentary basins included; Gindi and Mubarak basins. Geophysical and 3D seismic data integrated with well logs, as well as geochemical data from 5 wells, all resulted in an accurate delineation of the structure traps and a reassessment of the elements of the petroleum system in this area. Mentioned basins are formed as a result of Late Cretaceous wrench tectonics. Such tectonic regime was responsible for generating oil entrapment and conduit faults in Cretaceous reservoirs. Detailed geochemical analysis proved that the …
Lineaments Detection And Groundwater Exploration Using Gis And Geo-Electric Data At Wadi El-Asyuti Area, Eastern Desert, Egypt., Ashraf Abdo, Hassan Sabet, Mohamed Mebed
Lineaments Detection And Groundwater Exploration Using Gis And Geo-Electric Data At Wadi El-Asyuti Area, Eastern Desert, Egypt., Ashraf Abdo, Hassan Sabet, Mohamed Mebed
Al-Azhar Bulletin of Science
Geo-electric and GIS data toWadi El-Asyutiarea, central Eastern Desert, Egypt have been used for identify the different lineaments and possibilities of the occurrence of the groundwater.Shaded relief maps were developed from the digital elevation model (DEM) which used for identifying the lineaments. Geomatica software extracted the lineaments at the final maps with NW-SE direction.Meanwhile the geologic fault trends derived from geologic map take NW-SE, WNW-ESE, N-S and ENE-WSW directions. Twenty two electric resistivity soundings were conducted in the study area and three cross sections. Drilled well is near from VES-22. Geo-electric and drilling results reflected three layers. The first one …
Application Of Electrodialysis Technique In Removal Of Some Heavy Metal Ions From Discharge Wastewater In Paper Industry, Amr El-Shamy, Mostafa Emara, Rabab Abou Shahba, Aya Shoeeb
Application Of Electrodialysis Technique In Removal Of Some Heavy Metal Ions From Discharge Wastewater In Paper Industry, Amr El-Shamy, Mostafa Emara, Rabab Abou Shahba, Aya Shoeeb
Al-Azhar Bulletin of Science
Electrolysis (ED) is a modern technology for separating pollutants using membranes located in an electric field and has therefore been used in industrial wastewater treatment. The cornerstone of an ED cell is a stack of membranes whose planar plate is composed of cation (CM) and anion (AM) selective membranes. To investigate design requirements such as limiting current density (LCD), current efficiency and membrane resistance by laboratory experimental scale using an ED cell with electrodes, stainless steel 316 [cathode (-) and anode (+)],value of pH equal 6.8 and low voltage supply energy of 24.8 V is installed to remove about 100mg/L …
Toward Efficient And Safe Control Strategy Against Cotton Leaf Worm Spodoptera Littoralis (Boisd.) (Lepidoptera: Noctuidae) Applying Onion And Pepper Extracts And Their Oils., Walaa Ahmed, Wedad Atwa, Manal Elshaier, Ghada Abdullah
Toward Efficient And Safe Control Strategy Against Cotton Leaf Worm Spodoptera Littoralis (Boisd.) (Lepidoptera: Noctuidae) Applying Onion And Pepper Extracts And Their Oils., Walaa Ahmed, Wedad Atwa, Manal Elshaier, Ghada Abdullah
Al-Azhar Bulletin of Science
Spodoptera littoralis (Boisduval) is a very destructive pest of a widely huge number of plants all over the world. It caused huge damage to several crops. Pesticides have dangerous effect on human health. Plant extracts and oil have been shown to act as potent acute or chronic insecticides and insect growth regulators. Different concentrations of onion extract, pepper extract and its essential oils were used against 2nd instar larvae beside Agron 10% under laboratory conditions. the treated larvae with onion, pepper extracts showed shrinkage in larvae size where onion oil, pepper oil caused obvious swelling. Onion extract showed the highest …
Optical Characterization Of Stabilized Atmospheric Pressure Pin To Plate Plasma Source, Ahmed Abdelradi, Ahmed Samir, Farouk Elakshar, Abdou Garamoon, Mansour Elsabagh
Optical Characterization Of Stabilized Atmospheric Pressure Pin To Plate Plasma Source, Ahmed Abdelradi, Ahmed Samir, Farouk Elakshar, Abdou Garamoon, Mansour Elsabagh
Al-Azhar Bulletin of Science
DC Stabilized Discharges (DCSD) was generated in atmospheric pressure argon for a pin to plate. In this paper, discharge with a flowing argon gas into the air (plasma Source) is investigated by optical emission spectroscopy technique. The emission spectra of excited species of atomic-hydrogen, N2 and Ar were observed and measured. The rotational and vibrational temperatures of the discharge were measured by comparing modelled optical emission spectra with masured spectra from the discharge by using several different vibrational bands of the 2nd positive system (SPS) of N2 ( N2[C 3Πu] → N2[B 3Πg]). The optical characteristics of the discharge shown …
New Fluorite Index Using Aster Data Of Gabal Abu Diyab Area, Central Eastern Desert, Egypt, Mahmoud Hafez, Ibrahim Abu El-Leil, Nehal Soliman, Mostafa Abu Bakr
New Fluorite Index Using Aster Data Of Gabal Abu Diyab Area, Central Eastern Desert, Egypt, Mahmoud Hafez, Ibrahim Abu El-Leil, Nehal Soliman, Mostafa Abu Bakr
Al-Azhar Bulletin of Science
Remote sensing represents a significant function in the exploration of minerals. Extraction and identification of mineral occurrences in semi-arid to arid regions are some of the remote sensing confirmed uses. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images have been combined with band ratio processing technique for detecting the fluorite mineral occurrences in the area around Gabal Abu Diyab, Central Eastern Desert, Egypt. The proposed band ratio derived from ASTER images Spectra [(b8/b6) * (b5/b3)] can be considered to represent the new Fluorite Index (FI). The USGS Spectral libraries are used to extract the new index and validated …
Coronavirus Epidemic Model With Isolation And Nonlinear Incidence Rate, Afaf Zaghrout, Youssra Ali, Doaa Elpagouri
Coronavirus Epidemic Model With Isolation And Nonlinear Incidence Rate, Afaf Zaghrout, Youssra Ali, Doaa Elpagouri
Al-Azhar Bulletin of Science
In our article we proposed an epidemiological model consisting of five compartments that describe corona virus disease with isolation. We developed an SEIR system to produce the dynamical behaviour of infection by adding isolation compartment F(t) (that is because of the isolation of the infected individuals will reduce the spread of the disease). We formulated our model with nonlinear incidence rate. First, we discussed the positivity and boundedness of the model. Then we calculated the basic reproduction number of the model under certain conditions. By analysing the local and the global stability of our model, it is noticed that this …
Pulse Propagation Through A Medium Consists Of Two Three-Level Atoms, Rasha Rabea, Mervat Eldeberky, Mohamed Ahmed
Pulse Propagation Through A Medium Consists Of Two Three-Level Atoms, Rasha Rabea, Mervat Eldeberky, Mohamed Ahmed
Al-Azhar Bulletin of Science
The coherent propagation of two optical short pulses through a resonant medium consisting of two three-level atoms in the configuration is investigated. A self-consisting analytical solution without steady state or adiabatic approximations is presented. The electric field in the model studied consists of two co-propagating plane waves, each of which is in near resonance with a transition in the absorber. The density matrix of two three level atoms is studied. Also, the reduced density matrices are stated. The present approach for the semiclassical treatment of resonant coherent interactions in three-level atoms represents a generalization of the Maxwell- Bloch equations for …
Synthesis, Structural Characterization, And Catalytic Reduction Study Of Co(Ii) Complex Towards Toxic Organic Compounds; Nitrophenol, And Nitroaniline, Aml Saleh, Abeer Faheim, Omayma Mostafa, Zeinab Abdelwahab, Aida Salman
Synthesis, Structural Characterization, And Catalytic Reduction Study Of Co(Ii) Complex Towards Toxic Organic Compounds; Nitrophenol, And Nitroaniline, Aml Saleh, Abeer Faheim, Omayma Mostafa, Zeinab Abdelwahab, Aida Salman
Al-Azhar Bulletin of Science
This work demonstrates the synthesis of Co(II) complex of a new imine ligand incorporated sulfonamide, and coumarin moiety. The ligand and its complex were characterized by elemental analysis, IR, 1HNMR, mass, UV-Vis spectroscopy, molar conductance, magnetic susceptibility and thermal gravimetric analysis (TGA-DTG). According to the spectral analysis, the ligand, HL acts as a multidente donor coordinating through NONO donor sites. The Co(II) complex has tetrahedral geometry, and non-electrolytic in nature. The thermodynamic parameters as activation energy, enthalpy of activation, entropy of activation, and free energy of activation were determined via the thermal analysis. Furthermore, the ability of Co(II) complex as …
Vorr: A New Round Robin Scheduling Algorithm, Afaf Abdelhafiz
Vorr: A New Round Robin Scheduling Algorithm, Afaf Abdelhafiz
Al-Azhar Bulletin of Science
Task scheduling on resources is critical for improving the performance of real-time systems. Enormous efforts have recently and rapidlybeen proposed by many researchers with improvements in various accessible algorithms of the task scheduling process. Each improvement contributes to the optimization of the system act. The field of enhancing CPU scheduling algorithms (such as the Round Robin algorithm RR) is still open. The Round Robin scheduling has many negatives, such as high waiting time, high turnaround time, or a high number of context switches. Such negatives affect the performance of the algorithm badly. This paper discusses a new approach named, VORR …
Cytotoxicity And Antimicrobial Activities Of Some Soft Corals Inhabiting The Red Sea, Egypt., Abdallah Alian, Abo Bakr Abdel Shakor, Khaled Geba, Alaa Osman
Cytotoxicity And Antimicrobial Activities Of Some Soft Corals Inhabiting The Red Sea, Egypt., Abdallah Alian, Abo Bakr Abdel Shakor, Khaled Geba, Alaa Osman
Al-Azhar Bulletin of Science
Cancer and infectious diseases are notoriously known as deleterious health threats for the world, especially in the developing countries. The aim of the present study was to evaluate the cytotoxicity and antimicrobial activities of the methanolic extracts of the soft corals Nephthea elatensis, Heteroxenia fuscescens, Ellisella juncea, Dendronephthya mollis, and Sinularia hirta, that are native to the Red Sea in Egypt. The cytotoxicity assay was carried out by the enzymatic reduction of 3-[4,5-dimethylthiazole-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay against lung adenocarcinoma cell line (A549). Moreover, the antimicrobial activity was carried out against 11 human pathogenic bacterial and fungal strains using well-cut diffusion …
Reservoir Characterization Of The Upper Abu Roash “G” Sandstone In West Of Nile Area, Western Desert, Egypt., Esam Abd El-Gawad, Mohamed Fathy, Mahmoud Elsherbiny
Reservoir Characterization Of The Upper Abu Roash “G” Sandstone In West Of Nile Area, Western Desert, Egypt., Esam Abd El-Gawad, Mohamed Fathy, Mahmoud Elsherbiny
Al-Azhar Bulletin of Science
Accurate reservoir characterization is an important stage in developing, managing the reservoir, and enhancement the production which depends mainly on a good description and precise interpretation of the reservoir facies. The study area is considered as a part of Qarun Petroleum Company’s development leases which are located in the western side of Beni Suef Basin, the northeastern Western Desert which is considered the most important petroleum province in Egypt. Integrated sedimentological analysis of core description, petrographic and mineralogical constituents were carried out on the Upper Abu Roash “G” sandstone reservoir. The core description included 81.25 feet from the WON C-18 …
Reservoir Characterization And Petroleum Geology At Esh El Mallaha Field, Southern Gulf Of Suez, Egypt, Ahmed Embabi, Mohammad Abdelwahhab, Nabil Abdelhafez
Reservoir Characterization And Petroleum Geology At Esh El Mallaha Field, Southern Gulf Of Suez, Egypt, Ahmed Embabi, Mohammad Abdelwahhab, Nabil Abdelhafez
Al-Azhar Bulletin of Science
Reservoir quality assessment, pointing to possible capacities for holding hydrocarbons, is crucial during exploration-phases of petroleum. This investigation closely examines the petrophysical properties of Nubia-Sandstone Formation upon performing well-log analysis of the available well-log data located at West Esh El Mallaha area, southern part of the Gulf of Suez, Egypt. It is an attempt to reveal the hydrocarbon potentialities within Paleozoic reservoirs of the area. Nubia Formation represents an important reservoir in the Gulf of Suez province with at least 15% of hydrocarbon production potential. Well-log analysis, in means of defining the petrophysical properties (shale-volume, porosity, and water-saturation), of Nubia …
Monte Carlo Method Estimates For Internal Dosimetry Of Well Differentiated Thyroid Cancer Patients, Maged El-Din, Amr Kany, Eman Massoud, Ahmed El-Agamawi, Mohamed Ezz El-Din
Monte Carlo Method Estimates For Internal Dosimetry Of Well Differentiated Thyroid Cancer Patients, Maged El-Din, Amr Kany, Eman Massoud, Ahmed El-Agamawi, Mohamed Ezz El-Din
Al-Azhar Bulletin of Science
During radiotheranostic procedures, radioiodine-131(131I)activities deliver high internal gamma (ɣ) doses to the patient’s organs. Thus, studying the internaldoses of patients is highly required to predict the stochastic or deterministiceffect of gamma radiation that may occur to patients.The objective ofthis study is to calculatethe internal doses for 11 critical organs or body tissues insideWell Differentiated Thyroid Cancer (WDTC) patients’ bodiesafter receiving diagnostic and therapeutic 131I activitiesorally during 6days post administration.Internal effective doses delivered tocritical organs are estimated mathematically using Monte Carlo simulation model in which the actual geometry, volume, mass of organs and the source localization wasdesigned based onthe patients’ CT …
Modeling Of The Dynamics Adsorption Of Some Hazardous Elements From Aqueous Solution Onto Bentonite-Calcium-Alginate Beads, Riham Abou-Lilah, Nagwa Badway, Azza Gamal, Hoda Rizk, Amal Ali, Mostafa Elshorbagy
Modeling Of The Dynamics Adsorption Of Some Hazardous Elements From Aqueous Solution Onto Bentonite-Calcium-Alginate Beads, Riham Abou-Lilah, Nagwa Badway, Azza Gamal, Hoda Rizk, Amal Ali, Mostafa Elshorbagy
Al-Azhar Bulletin of Science
Encapsulation of bentonite-Ca-alginate was employed for discharge of Cs+, Sr2+, UO22+ and Co2+ from aquatic solution. Preferable pH for elimination of these ions was 5.5. For radiation stability, bentonite-Ca-alginate was investigated; a 60Co source was used to expose it to gamma radiation. Data obtained from (FT-IR) assessed radiation-induced effect on a stability of bentonite-Ca-alginate. Irradiated samples untill 100 kGy do not impair an absorption of an ions examined. In a column application, bentonite-Ca-alginate composite beads were examined for the discharge of these ions from multicomponent solution using fixed-bed column. Effect on column output of various parameters, like bed height, flow …
Preparation, Characterization And Antimicrobial Activity Of Chitosan-Fatty Acid Derivatives As A Drug Delivery System: Intercelation And In Vitro Release Of Ciprofloxacin, Shimaa Hamza, Noha Alian, Maha Elsawy, Nihal Shaker
Preparation, Characterization And Antimicrobial Activity Of Chitosan-Fatty Acid Derivatives As A Drug Delivery System: Intercelation And In Vitro Release Of Ciprofloxacin, Shimaa Hamza, Noha Alian, Maha Elsawy, Nihal Shaker
Al-Azhar Bulletin of Science
One of the most exciting areas of research in pharmaceutical sciences is the development of new delivery systems for controlled drug release. The main objective of this research focused on chitosan-fatty acid derivatized matrix for drug delivery. Saturated fatty acids (lauric acid and stearic acid) as well as unsaturated fatty acids (oleic acid and linoleic acid) are involved in this study which enhance the chemical properties of chitosan in drug delivery and enhance the permeability of ciprofloxacin drug compounds. The structure of the synthesized derivatives was characterized by Fourier transform infrared spectroscopy and X-ray diffraction. Intercalation and in vitro release …
Suppress The Vibration Of A Nonlinear Dynamical System Subjected To External Force Using A Positive Position Feedback Control., Fagr Osama, Yaser Amer, Kamal Raslan
Suppress The Vibration Of A Nonlinear Dynamical System Subjected To External Force Using A Positive Position Feedback Control., Fagr Osama, Yaser Amer, Kamal Raslan
Al-Azhar Bulletin of Science
Vibration suppression using a positive position feedback (PPF) control for a nonlinear dynamical system which subjected to an external force is studied. The proposed model is the vertical dynamic excitation of structures induced by a single pedestrian walking along a straight path on flat and relatively stiff surfaces. The multiple scale perturbation technique was applied to derive the first order approximate solution of the system. The response equation and the stability criteria for the system were derived near the simultaneous primary and internal resonance cases. MATLAB 14.0 have been used for the numerical studying to show the time history of …
Peculiarities Of U(Vi) Adsorption From Acidic Solution Using Chitin-Derived Chitosan As A Low-Priced Bio-Adsorbent, Khaled Abd El-Rahem, Mahmoud Taher, Mohamed Cheira
Peculiarities Of U(Vi) Adsorption From Acidic Solution Using Chitin-Derived Chitosan As A Low-Priced Bio-Adsorbent, Khaled Abd El-Rahem, Mahmoud Taher, Mohamed Cheira
Al-Azhar Bulletin of Science
Chitosan (CS) as an inexpensive bio-adsorbent was set by chitin deacetylation using sodium hydroxide. The prepared bio-adsorbent was distinguished via Scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDX), Brunner-Emmett-Teller surface area (BET) analyzer, and Fourier transform infrared spectroscopy (FTIR). Chitosan implemented for U(VI) adsorption, and the studied parameters that are pH, time of contact, initial concentration, and temperature, were determined by batch technique. The maximum uptake of CS adsorbent is 88.0 mg/g at 200 mg/L initial U(VI) concentration, pH 3.5, and 25 °C. The kinetic information agreed with the pseudo-second-order model, which considered the attendance of chemisorption. …
Distributed Intrusion Detection Systems In Big Data: A Survey, Bashar Hameed, Abdallah Alhabshy, Kamal Eldahshan
Distributed Intrusion Detection Systems In Big Data: A Survey, Bashar Hameed, Abdallah Alhabshy, Kamal Eldahshan
Al-Azhar Bulletin of Science
We live in a time where data stream by the second, which makes intrusion detection a more difficult and tiresome task, and in turn intrusion detection systems require an efficient and improved detection mechanism to detect the intrusive activities. Moreover, handling the size, complexity, and availability of big data requires techniques that can create beneficial knowledge from huge streams of the information, which imposes the challenges on the process of both designing and management of both Intrusion Detection System (IDS) and Intrusion Prevention System (IPS) in terms of performance, sustainability, security, reliability, privacy, energy consumption, fault tolerance, scalability, and flexibility. …
The Electrochemical Sensing Of Nalbuphine Hydrochloride Drug Substance In Vitro By The Cyclic Voltammetric And Conductometric Titration Techniques, Badr Elsayed, Essam Gomaa, Mgdy Awad, Ammar Abdallah
The Electrochemical Sensing Of Nalbuphine Hydrochloride Drug Substance In Vitro By The Cyclic Voltammetric And Conductometric Titration Techniques, Badr Elsayed, Essam Gomaa, Mgdy Awad, Ammar Abdallah
Al-Azhar Bulletin of Science
The electrochemical sensing of Nalbuphine hydrochloride drug substance in vitro by the cyclic voltammetry technique using the activated glassy carbon electrode. The solvation of CdCl2 alone or in the presence of Nalbuphine HCl was studied by CV technique in 0.05 M KCl supporting electrolyte and different concentrations from CdCl2 at 305.15K. The cyclic voltammograms were preceded at different scan rates 0.1, 0.05, 0.02 and 0.01 V Sec-1. Also, different Nalbuphine HCl concentrations were utilized for studying their effect as electrochemical sensors on the solvation and kinetics parameters of CdCl2. The redox mechanism of the system was determined from the resulted …
Topp-Leone Lomax Distribution, Salwa Radwan
Topp-Leone Lomax Distribution, Salwa Radwan
Al-Azhar Bulletin of Science
A new compound distribution is extended in this article, the Lomax distribution by using the Topp-Leone generated family. The statistical properties as Quantile function, moments and distribution of order statistics are studied. Maximum likelihood method is discussed and the element of the information matrix, differential entropy are provided. Simulation study is conducted to assess the performance of the parameters of Topp Leone Lomax distribution. An application is used to show that our distribution is better than one based on the Lomax and Exponentiated Lomax distribution.
Estimating And Prediction Accelerated Life Test Using Constant Stress For Marshall-Olkin Extended Burr Type X Distribution Based On Type-Ii Censoring, Reda Refaey
Al-Azhar Bulletin of Science
In this paper constant stress accelerated life tests are discussed based on Type II censored sampling from Marshall-Olkin extended Burr Type X Distribution. The model parameters and the acceleration factor are estimated using the maximum likelihood estimation method and two-sample predictions are considered for future order statistics. Further, the asymptotic confidence intervals for the model parameters are discussed. Numerical study is given, and some interesting comparisons are presented to illustrate the theoretical results. Moreover, the results are applied on real dataset.
A Semi-Analytical Solution For The Motion Of A Low Altitude Earth Satellite Under J2-Gravity And Air Drag Perturbations, Hussein Embaby, Ahmed Ibrahim, Inal Hassan, Mohamed Nader Ismail
A Semi-Analytical Solution For The Motion Of A Low Altitude Earth Satellite Under J2-Gravity And Air Drag Perturbations, Hussein Embaby, Ahmed Ibrahim, Inal Hassan, Mohamed Nader Ismail
Al-Azhar Bulletin of Science
This paper is dealt with the zonal harmonics up to J4 and atmospheric drag effects on the orbital elements of low satellite. There are many techniques to treat this problem as analytical and numerical techniques. The solution can be obtained by using two methods which are Cowell's Method and Average Method. We used average method as analytical method and applied Lagrange planetary equation to obtain the variation on the orbital elements. Cowell’s method was applied to estimating the perturbation because it is the most straight advancing method and correct. The atmospheric model drives in reckoning change of the density scale …
Adsorption Of Copper Ions On Chitosan-Based Films For Detection Of H2s Gas Pollutant, Ahmed Gamal, Ahmed Ibrahim, Adham El-Zomrawy
Adsorption Of Copper Ions On Chitosan-Based Films For Detection Of H2s Gas Pollutant, Ahmed Gamal, Ahmed Ibrahim, Adham El-Zomrawy
Al-Azhar Bulletin of Science
Sulfide in its form of free hydrogen sulfide is recognized to cause anxiety at its lower level of concentration, but at a higher level, it causes permanent brain damage, fainting, or even death through asphyxiation. In this study, chitosan films were fabricated, and the copper ions were loaded onto them by way of adsorption to be used in the detection of hydrogen sulfide (H2S) gas electrochemically. The results presented an amazing variation in the electrical resistivity and conductivity of the chitosan and copper-loaded chitosan films against time in response to H2S gas adsorption. Also, the results demonstrate a significant increase …
Double Quantum Dot Of Graphene Nanoribbon Qubit For Quantum Information, Asmaa Selim
Double Quantum Dot Of Graphene Nanoribbon Qubit For Quantum Information, Asmaa Selim
Al-Azhar Bulletin of Science
Weak hyperfine interaction as well as spin-orbit interaction enforced that graphene quantum dot qubit material rather than other semiconductor qubits material. So; we suggest here a Hamiltonian model of a graphene nanoribbon double quantum dot qubit based on the functionalization of graphene nanoribbon by hydrogen atoms to produce a theoretical studied on a quantum computer. We are using the Dirac equation and the Heisenberg exchange approach to solve our model. Then we determine the exchange interaction Jex. We investigate the effects of potential barrier height and barrier thickness d on exchange coupling Jex. Our results show a great variation of …
The Behavior Of Moments Of Inertia And Energy Staggering In Superdeformed Nuclei., Ibrahim Aziz, Madiha Okasha, Gamal Ahmed
The Behavior Of Moments Of Inertia And Energy Staggering In Superdeformed Nuclei., Ibrahim Aziz, Madiha Okasha, Gamal Ahmed
Al-Azhar Bulletin of Science
Three pairs of signature partners' transition energies of Thallium (Tℓ) odd mass superdeformed (SD) nuclei's (A ~ 191-195), were fitted with the experimental one using the Bohr-Mottelson four-parameter collective rotational model. We chose the Bohr-Mottelson four-parameter rotational energy formula because it has been reported that it has excellent compatibility with the γ-ray transition energies. The four model parameters were extracted using a suitable search program. Harris's method was used to calculate the superdeformed rotational bands' (SDRBs) bandhead spins. The values of the adopted parameters, which were obtained using a simulated fitting search software, were used to measure the rotational frequency, …
Biochemical And Hemotologica Changes Against Doxorubicin Induced Toxicity In Rat, Mariam Thabit, Sayed Bakry, Yakout A. El-Senosia, Samy Ali Hussein
Biochemical And Hemotologica Changes Against Doxorubicin Induced Toxicity In Rat, Mariam Thabit, Sayed Bakry, Yakout A. El-Senosia, Samy Ali Hussein
Al-Azhar Bulletin of Science
Doxorubicin is an anthracycline drug first extracted from Streptomyces peucetius var. caesius in the 1970’s. It used routinely as highly efficacious drug in many kinds of cancers. But its clinical usefulness is still restricted due to its specific toxicities. This study was designed to investigate doxorubicin-induced toxicity in albino rat model. Thirty male young adult Sprague Dawley rats were divided into Three groups. The first served as control group while second and third group treated with 2.5 and 5mg / kg /week. Two hours post DOX administration rats from all the groups were killed, blood samples were drawn for hematological …
Dromedary Camel Epididymal Sperm Characteristics At Breeding And Non-Breeding Seasons, H. Elsharnoby, O. M. Kandil, H. A. Abu-Elnaga
Dromedary Camel Epididymal Sperm Characteristics At Breeding And Non-Breeding Seasons, H. Elsharnoby, O. M. Kandil, H. A. Abu-Elnaga
Al-Azhar Bulletin of Science
Testicles from 30 clinically healthy male mature dromedary camels were gathered from the El-Basatin slaughterhouse all the breeding season (Nov. 2018 to Apr. 2019) and the nonbreeding season (May 2019 to Oct. 2019). Within one year the epididymal sperm were obtained twice per month. This manuscript aimed to investigate the influence of seasonality on dromedary camel epididymal sperm characteristics (motility, viability, sperm cell concentration, morphology and membrane integrity). The results depicted that during the breeding period, the rate of motility, concentration, live spermatozoa, normal morphology and the intact membrane of dromedary camel epididymal sperm showed a high significant increase (P<0.05) when compared to the nonbreeding period. While rate of death, abnormalities and membrane damage of the dromedary camel epididymal sperm were highly increased (P <0.05) during non-breeding when compared to the breeding period. In conclusion, the dromedary epididymal camel’s sperm characteristics, viability and quality improved during breeding season.
Effect Of Adding Lime Waste And Sodium Chloride On Bentonite Swelling Behavior And Infiltration Rate, Marwa Hussien
Effect Of Adding Lime Waste And Sodium Chloride On Bentonite Swelling Behavior And Infiltration Rate, Marwa Hussien
Al-Azhar Bulletin of Science
Bentonite is artificial clayey soil that not only has the tendency to swell or increase in volume but also to shrink or decrease in volume due to variations in water content. In geotechnical engineering field, this soil causes severe damage to structures that are founded. The aim of this study is to investigate the effect of adding lime waste which is obtained from Abou Korkas sugarcane factory and sodium chloride on swelling properties of bentonite as a chemical stabilization process. In this regard, important techniques (SEM and EDX) were carried out to identify the mineralogy and microstructure variations before and …