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Structural, Magnetic and Dielectric Properties of Fe-Co Co-Doped Ba0.9Sr0.1TiO3Prepared by Sol Gel Technique

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New Journal of Glass and Ceramics 2014年第2期4卷 19-28页

作者： inas kamal batttisha Ibrahim Sayed Ahmed Farag Mostafa kamal Mohamed Ali Ahmed Emad Girgis Hesham Azmi El Meleegi Fawzi Gooda El Desouky Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt National Research Center (NRC) Solid State Physics Department Dokki Giza Egypt National Research Centre (NRC) Thin Film Lab Electron Microscope Department Dokki Giza Egypt

The structural, dielectric and magnetic properties of pure and Fe-Co co-doped Ba0.9Sr0.1TiO3, (Ba(1-x)SrxTiO3, where (x = 0.10) and (Ba0.9Sr0.1Ti(1-x-y)FexCoyO3), where (x = 0.1, y = 0) and (x = 0 and y = 0.10) and (x = 0.5, y = 0.5) in powder form, abbreviated as (BST) and (BST10FO), (BST10CO) and (BST5F5CO), respectively were prepared by a modified sol gel technique. Crystallization, surface morphology and electrical behavior of BST are improved by Fe3+ and Co2+ ions with optimized grain size. Phase identification by using X-ray diffraction and surface morphology will be studied by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM). Phase identification by using X-ray diffraction and surface morphology evaluation by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM) will be studied. The nano-scale presence and the formation of the tetragonal perovskite phase as well as the crystallinity were detected using the mentioned techniques. The dielectric properties of the prepared samples have been investigated as a function of temperature and frequency. The dielectric measurements are carried out in the frequency range of 42 Hz - 1 MHz, at temperature ranging between 25°C and 250°C. The results showed an abrupt decrease in the dielectric permittivity by increasing the frequency range. The magnetic hysteresis loop confirmed enhancement in the magnetization properties by co-doping with Fe3+-Co2+ ions. An increase in the saturation of the magnetization at room temperature was detected by decreasing the crystallite sizes of the prepared samples.

关键词： Sol Gel Nano-Structure Magnetic Hysteresis Loop Dielectric Permittivity Nano-Composite BaSrTiO3 (BST) TEM XRD SEM

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Dielectric and Magnetic Properties of Nano-Structure BiFeO3Doped with Different Concentrations of Co Ions Prepared by Sol-Gel Method

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New Journal of Glass and Ceramics 2015年第3期5卷 59-73页

作者： inas kamal batttisha Ibrahim Sayed Ahmed Farag Mostafa kamal Mohamed Ali Ahmed Emad Girgis Fawzi El Desouki Hesham Azmi El Meleegi Fawzi El Desouki National Research Centre (NRC) Solid State Physics Department 33 Bohouth St Dokki Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt National Research Centre (NRC) Thin Film Lab Electron Microscope Department 33 Bohouth St Dokki Giza Egypt

BiFe1-xCoxO3 (x = 0, 0.03, 0.05 and 0.1) symbolic as (BFO, BF3CO, BF5CO and BF10CO) in powder form has been prepared by sol-gel technique using ethylenediamine tetraacetic acid (EDTA) as a chelating agent. X-ray diffraction (XRD) and FTIR analysis showed rhombohedra distorted BiFeO3 structure with compressive lattice distortion induced by the Co substitution at Fe sites. The transmission electron microscope (TEM) shows irregular particles. The additive of cobalt oxide has led to grains refining giving the following crystallite sizes of 18 nm for BF5Co. The scanning electron microscope (SEM) study reveals that the samples morphology shows relatively uniform grain size distribution. The dielectric properties of BiFeO3 nano-particles in the frequency range of 1 up to 5 MHz at RT revealed that the A.C. conductivity of the prepared samples reaches its maximum value in BF5CO. By decreasing BiFeO3 particle size as a result of doping with different Co ion concentrations, an enhancement in magnetization and a simultaneous suppression in current leakage occurred. The remnant magnetization Mr of BiFe1-xCoxO3 (x = 0, 0.03, 0.05, 0.1) ceramics significantly enhanced, which provides potential applications in information storage.

关键词： Nano-Structure Multiferroic BiFe1-xCoxO3 (x = 0 0.03 0.05 0.1) XRD FTIR TEM Remnant Magnetization

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Optoelectronic and thermoelectric properties of spinel chalcogenides HgLa2X4（X=S and Se）:A first-principles study

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Journal of Rare Earths 2024年第10期42卷 1927-1936页

作者： Aparna Dixit inas A.Ahmed Jisha Annie Abraham Zeinhom M.El-Bahy Mumtaz Manzoor Sajad Ahmad Dar Ramesh Sharma Department of Basic Science and Humanities Pranveer Singh Institute of Technology Department of Chemistry Faculty of ScienceKing Khalid University Department of Physics National Defence Academy Department of Chemistry Faculty of ScienceAl-Azhar University Institute of Physics Slovak Academy of Sciences Department of Physics Motilal Vigyan Mahavidyalya College Department of Applied Science Feroze Gandhi Institute of Engineering and Technology

We investigated spinel chalcogenides HgLa2（S/Se）4by using density function theory,and scrutinized the structural,optical,electrical,mechanical and thermoelectric transport characteristics of HgLa2（S/Se）4spinel *** enthalpy of formation,energy of cohesion,and energy volume optimum plots were used to obtain the stability as well as the perfect ground state of these *** ductility of these materials was the best illustrated with the help of Poisson's and Pugh's *** band gap results were obtained using Trans and Blaha modified Becke-Johanson potential（TB-mBJ）.Both the materials present semi-conducting nature with direct band gap equal to 1.449 and 0.892 eV respectively for HgLa2S4and *** were also made for optical characteristics with the values of dielectric function,absorption coefficient,optical conductivity,reflectivity,and refractive *** to the findings,both of these materials are suitable for infrared optoelectronic *** materials were found to have promising optoelectronic and thermoelectric applications after their optical properties and transport aspects were *** tiny levels of temperature conductivities,substantial am ounts of power conductivities,the figure of merit（more than unity）,as well as Seebecs coefficients all point to the potential use of both the materials in thermoelectric power generators.

关键词： Density functional theory Direct band gap Optoelectronic Power factor Semiconductors Thermoelectric

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Analysis of cerium substitution in Co-Sr based spinel ferrites for high frequency application

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Journal of Rare Earths 2024年第9期42卷 1755-1763,I0005页

作者： Laura Khudaysh inas A.Ahmed Syeda Rabia Ejaz Sajjad Ahmad Khan Yasir A.Haleem Mohamed M.Ibrahim Mahmood Ali Hafiz Muhammad Tahir Farid Zeinhom M.El-Bahy Department of Physics Faculty of ScienceJazan UniversityJazan45142Saudi Arabia Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha62224Saudi Arabia Department of Physics The Government Sadiq College Women UniversityBahawalpur63100Pakistan Institute of Physics Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Centre of Excellence in Solid State Physics University of the PunjabLahorePakistan Department of Physics Government CollegeTaunsa Sharif32200Pakistan Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt

Spinel ferrites exhibit exceptional magnetic properties,making them a distinctive class of magnetic *** sol-gel technique was utilized for the synthesis of spinel ferrites with the chemical formula Co_(0.6)Sr_(0.4)Ce_(x)Fe_(2-x)O_(4). Following that,a comprehensive X-ray diffraction analysis unveiled the crystalline cubic structure of the synthesized *** the utilization of the M-H loop approach,the ferromagnetic attributes of ferrites were assessed,and the assimilation of rare earth elements led to substantial enhancements in saturation magnetization,remanence,and *** ferrites with a high concentration of rare earth elements have improved direct current resistivity and activation *** logarithm of a material's resistance increased from 5.29 to 8.12 Ω·cm as cerium is *** a change in the amount of cerium,the activation energy goes up from 0.19 to *** changing the frequency from 5.5 to 9.5 GHz,the dielectric characteristics were *** the frequency goes up,the dielectric constant goes *** ferrites that have been made better in every way can be used in high-frequency applications.

关键词： Activation energy DC electrical resistance Remanence magnetization Cobalt strontium spinel ferrites High frequency application Rare earths

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Dehydration risk factors and outcomes in older people in rural areas

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Frontiers of Nursing 2022年第4期9卷 395-403页

作者： Mostafa Shaban Nagat Habib inas Helmy Huda Hamdy Mohammed Gerontological Nursing Department Faculty of NursingCairo UniversityCairo 12613Egypt Community Health Nursing-Faculty of Nursing Cairo UniversityCairo 12613Egypt Maternal&Newborn Health Nursing Faculty of NursingHelwan UniversityCairo 11795Egypt

Objective:To determine the risk factors for dehydration in elderly people in one of Elbehira Governorate’s ***:A descriptive correlational design was utilized in this *** study was conducted at Elnemaria village,Markaz Abo Elmatamir,Elbehira Governorate,*** were collected using 3 tools:a structured interviewing questionnaire,a dehydration knowledge questionnaire,and a dehydration risk appraisal ***:The study found that 29.5%of the par ticipants were aged between 65 and *** constituted 51%of the study par *** majority of the study participants regularly took anti-acids,anti-inflammatory drugs,and *** the elderlies comprising the respondents,40%had a low level of knowledge regarding *** than half of the study subjects were at moderate risk for ***:The study showed that half of the par ticipants had diabetes and a medium level of information about *** study also showed in general that the elderly in the village are exposed to a moderate dehydration rate,and there is also a strong relationship between taking different types of medication and the occurrence of dehydration.

关键词： clinical signs dehydration elderly functional signs physiological signs

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Can miRNA712＿3p be a promising biomarker for early diagnosis of toxoplasmosis?

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Asian Pacific Journal of Tropical Medicine 2018年第12期11卷 688-692页

作者： Nermine Mogahed Fawzy Hussein Mogahed Safaa Ibrahim Khedr Rasha Abdelmawla Ghazala inas Mohamed Masoud Medical Parasitology Department Faculty of Medicine Alexandria University Medical Biochemistry Department Faculty of Medicine Alexandria University Pharmaceutical Chemistry Faculty of Pharmacy and Drug Manufacturing Pharos University in Alexandria

Objective: To assess the role of miRNA712_3p as a specific biomarker in early detection of toxoplasmosis in plasma of mice acutely infected with Toxoplasma gondii. Methods: Real-time PCR was used to measure the level of miRNA712_3p in plasma of infected mice. Immunecompetent and immune-suppressed mice were examined, three and five days post-infection. Results: Results revealed significant up-regulation of plasma miRNA712_3p in both immunecompetent and immune-compromised groups in comparison to the control non-infected group. Additionally, an increase in the level of miRNA712_3p was noticed correspondently in the parasite density detected in liver impression smears. Conclusions: miRNA712_3p can be used as a novel biomarker for the detection of Toxoplasma gondii infection in both immunecompetent and immune-compromised host.

关键词： Toxoplasma gondii microRNAs miRNA7123p Biomarker Real-time PCR

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Physical Properties of Nano-Composite Silica-Phosphate Thin Film Prepared by Sol Gel Technique

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New Journal of Glass and Ceramics 2012年第1期2卷 17-22页

作者： inas Battisha Amany El Nahrawy 不详

A series of silica-phosphate nano-composites prepared as a host thin films Physical Properties of Nano-Composite Silica-Phosphate Thin Film Prepared by Sol Gel Technique and doped with different concentrations of Er3+ ions have been synthesized using tetraesoxysilane TEOS, triethylphosphate TEP and erbium nitrate as precursor sources of silica, phosphorus and erbium oxides. The structural properties of pure silica-phosphate thin films and doped with different concentrations of Er3+ ions were studied, using x-ray diffraction (XRD) and Fourier Transform Infrared (FTIR). The morphology of silica-phosphate was characterized by Scanning electron microscope (SEM).

关键词： Sol-Gel Nano-Structure SiO2P2O5 Thin Film Scanning Electron Microscopy (SEM) XRD and FTIR

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Spot urinary sodium for assessing dietary sodium restriction in cirrhotic ascites

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World Journal of Gastroenterology 2009年第29期15卷 3631-3635页

作者： Mohammed Abdelhamid El-Bokl Bahaa Eldeen Senousy Khaled Zakaria El-Karmouty inas El-Khedr Mohammed Sherif Monier Mohammed Sherif Sadek Shabana Hassan Shalaby Department of Gastroenterology and Hepatology Ain Shams University school of Medicine Abbassia 11566 Cairo Egypt

AIM： To evaluate the accuracy of spot urinary Na/K and Na/creatinine （Cr） ratios as an alternative to 24-h urinary sodium in monitoring dietary compliance in patients with liver cirrhosis and ascites treated with diuretics. METHODS： The study was carried on 40 patients with liver cirrhosis and ascites treated with diuretic therapy. Patients were divided into two groups according to 24-h urinary sodium. We measured spot urine Na/K ratio, Na/ Cr ratio and 24-h urinary sodium. Student＇s t test was used to compare the interval variables and x^2 test to compare the nominal variables between the two groups. Receiver operator characteristic curve was used to identify the best cutoff point for Na/K and Na/Cr ratio. RESULTS： The best cutoff point for Na/K ratio was 2.5 （P 〈 0.001） and area under the curve （AUC） was 0.9, and for Na/Cr ratio, the best cutoff point was 35 （P 〈 0.001） and AUC was 0.885. Na/K ratio showed higher sensitivity and accuracy compared to Na/Cr ratio （87.5% and 87% for Na/K ratio; 81% and 85% for Na/Cr ratio, respectively）. CONCLUSION： Spot urine Na/K ratio has adequate accuracy for assessment of dietary sodium restriction compared with 24-h urinary sodium in patients with liver cirrhosis and ascites.

关键词： Ascites Liver cirrhosis Portal hypertension Urinary sodium

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Soybean lecithin-based extender improves Damascus goat sperm cryopreservationand fertilizing potential following artificial insemination

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Asian pacific Journal of Reproduction 2019年第4期8卷 174-180页

作者： Mohamed Fathi Rawash Zaher Dohreig Ragab inas Gamal Assi Mohamed Eman Abu-El Naga Magdy Badr Department of Theriogenology Faculty of Veterinary MedicineCairo UniversityGizaEgypt Artificial Insemination and Embryo Transfer Department Animal Reproduction Research InstituteGizaEgypt Immunity Department Animal Reproduction Research InstituteGizaEgypt Pathology Department Animal Reproduction Research InstituteGizaEgypt 5Department of TheriogenologyFaculty of Veterinary MedicineAswan UniversityAswanEgypt

Objective: To study the effect of adding different concentrations of soybean lecithin in Tris based extender and to compare the results of Tris soybean lecithin extender with two commercial diluents (egg yolk-based: BullXcell and plant-based: OptiXcell) for Damascus goat sperm cryopreservation. Methods: The ejaculates from 4 mature male Damascus goats were obtained by using an artificial vagina. Semen samples were pooled and diluted in Tris extender supplemented with soybean lecithin at different concentrations of 1.5%, 3.0%, 6.0% and 10.0% to get better concentration to be used for further experiments, with a final concentration of 240×106 spermatozoa/mL. Semen samples were packed in straws (0.25 mL), frozen by using an automated system and stored in liquid nitrogen at -196 ℃ for 48 h. After thawing (37 ℃/30 s), the samples were evaluated for sperm quality parameters, including sperm motility, membrane integrity and acrosome integrity. Malondialdehyde concentration was estimated as a marker for lipid peroxidation. Based on the previous investigations, only Tris extender supplemented with 3.0% soybean lecithin (based on its positive results) was used versus BullXcell and OptiXcell for sperm ultrastructure evaluation and artificial insemination by using electron microscope and artificial insemination of the synchronized does. Results: There was no significant difference between Tris-soybean lecithin at 3.0% and BullXcell/OptiXcell diluents in post-thaw sperm parameters and fertility following artificial insemination;meanwhile, the other concentrations of soybean lecithin (1.5%, 6.0% and 10%) showed lower sperm parameters following cryopreservation. Conclusions: Using of Tris-soybean lecithin based extender at the level of 3.0% can be an appropriate alternative to either BullXcell or OptiXcell for Damascus goat sperm cryopreservation.

关键词： Damascus goat Soy lecithin Sperm cryopreservation BullXcell OptiXcell

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Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

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Journal of Materials Science and Chemical Engineering 2015年第11期3卷 72-81页

作者： Mohamed El-Shahate Ismaiel Saraya inas Mostafa Bakr Department of Chemistry Faculty of Science Al-Azhar University Cairo Egypt Faculty of Engineering Mattareya Helwan University Cairo Egypt

The aim of the present work is to study the effect of Nano-barium sulfate additions on the physic-mechanical properties of hardened cement pastes. Nano-barium sulfate was prepared by the precipitation method. Eight mixes of filled cement pastes containing 0.5 wt%, 1.0 wt%, 1.5 wt% and 2.0 wt% of both nano-barium sulfate and micro-limestone were prepared and compared to the base OPC. The hydration characteristics were evaluated by the measure of combined water content, bulk density, total porosity and compressive strength for samples hydrated up to 90 days. The progress of hydration reactions was followed up by XRD analysis. The morphology and microstructure were studied by SEM. Nano-size barium sulfate acted as a nucleating agent and enhanced the hydration of cement pastes up to 2.0% mass content. Also, the microstructure was improved considerably. Accordingly, nano-size barium sulfate can be used successfully in the preparation of filled cement.

关键词： Nano-Barium Sulfate Cement Paste Filler Compressive Strength Microstructure

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