Effect of annealing treatment on the uniformity of CeO2/TiO2 bilayer resistive switching memory devices

M. Ismail,A.M. Rana,S.-U. Nisa,F. Hussain,M. Imran,K. Mahmood,I. Talib,E. Ahmed,D.H. Bao 한국물리학회 2017 Current Applied Physics Vol.17 No.10

Bilayer CeO2/TiO2 films with high-k dielectric property were prepared by rf magnetron sputtering technique at room temperature. Effect of annealing treatment on resistive switching (RS) properties of bilayer CeO2/TiO2 films in O2 ambient at different temperature in the range of 350e550 C was investigated. Our results revealed that the bilayer films had good interfacial property at 500 C and this annealing temperature is optimum for different RS characteristics. Results showed that bilayer CeO2/TiO2 film perform better uniformity and reliability in resistive switching at intermediate temperature (i.e. 450 C and 500 C) instead of low and high annealing temperature (i.e. 350 C and 550 C) at which it exhibits poor crystalline structure with more amorphous background. Less Gibbs free energy of TiO2 as compared to CeO2 results in an easier re-oxidation of the filament through the oxygen exchange with TaN electrode. However, the excellent endurance property (>2500 cycles), data retentions (105 s) and good cycle-to-cycle uniformity is observed only in 500 C annealed devices. The plots of cumulative probability, essential memory parameter, show a good distribution of Set/Reset voltage.

NEW CCD OBSERVATIONS AND THE FIRST PHOTOMETRIC STUDY OF THE CONTACT BINARY AP UMI

N. S. AWADALLA,M. A. HANNA,M. N. Ismail,I. A. Hassan,M. A. Elkhamisy 한국천문학회 2016 Journal of The Korean Astronomical Society Vol.49 No.3

We obtain the first complete CCD light curves (LCs) of the contact binary AP UMi in the VRI bands and analyzed them by means of the PHOEBE code. A spotted model is applied to treat the asymmetry in the LCs. The LC morphology clearly shows the O'Connell effect and the solution shows an influence of star spots on both components. Such effect of star spots is common between the RS CVn and W UMa chromospherically active stars. Based on the obtained solution of the LCs we investigate the evolutionary state of the components and conclude that the system is a pre-intermediate contact binary ($f=0.29$) with mass ratio $q=0.38$, and it is an A-type W UMa system where the less massive secondary component is cooler than the more massive primary one.} We obtain the first complete CCD light curves (LCs) of the contact binary AP UMi in the VRI bands and analyzed them by means of the PHOEBE code. A spotted model is applied to treat the asymmetry in the LCs. The LC morphology clearly shows the O'Connell effect and the solution shows an influence of star spots on both components. Such effect of star spots is common between the RS CVn and W UMa chromospherically active stars. Based on the obtained solution of the LCs we investigate the evolutionary state of the components and conclude that the system is a pre-intermediate contact binary ($f=0.29$) with mass ratio $q=0.38$, and it is an A-type W UMa system where the less massive secondary component is cooler than the more massive primary one.

Low Leakage Current by Solution Processed PTAA‑ZnO Transparent Hybrid Hetero‑Junction Device

Bablu K. Ghosh,Abdul I. A. Rani,Khairul A. Mohamad,Ismail Saad 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5

In this work solution processed novel poly-triarylamine (PTAA) organic p-type active layer on inorganic n-ZnO devicetransparency and electrical properties are investigated under illumination. Low cost organic–inorganic transparent hybridhetero-junction (HHJ) is a promising candidate for next-generation photovoltaic applications. Greater band gap organicmaterial window layer while inorganic material’s higher thermal stability as HHJ is suitable for detection and photovoltaicapplications. However, hetero-interface defects associated leakage current is the key issue of undermining large-area deviceelectrical performance. Hetero-interface defect associated carriers optical absorption limits transparency whereas leakagecurrent density is reliant on physical property and band barrier effect. It is demanded to investigate hetero-device physicalstuff and band barrier effect on electrical properties. Novel PTAA is deposited on RF-sputtered inorganic n-ZnO/ITO/glasssubstrate by spin-coating method. 100 and 60 nm PTAA thin films are deposited with 1000 and 2000 revolution per minute(rpm) growth sequence, respectively. PTAA as a transparent p-emitter is shown to absorb incident light beyond visible band,thereby it has promoted excitonic effect. Device I–V characterization carried out at different annealing temperatures andapplied voltage. Suitable annealing condition leakage current is shown to reduce nearly 10−4 A/cm2 and at higher appliedfield the greater rectifying I(+)/I(−) ratio is realized. Grain size is shown to increase with annealing effect however; leakagecurrent is remained almost independent of grain size.

Effect of dietary supplementation of garlic powder and phenyl acetic acid on productive performance, blood haematology, immunity and antioxidant status of broiler chickens

Ismail I. E.,Alagawany M.,Taha A. E.,Puvača N.,Laudadio V.,Tufarelli V. 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.3

Objective: The effect of garlic powder (GP) and phenyl acetic (PA) acid throughout the fattening period of broiler chickens on performance, blood parameters, immune, and antioxidant parameters as well as carcass traits was evaluated. Methods: A total of 210 day-old Cobb broiler chicks were randomly distributed into seven dietary treatments having five replications with six chicks per replicate. The first group (control) fed a basal diet without supplements, whereas the 2nd, 3rd, and 4th group were fed basal diet plus 0.25, 0.50, and 0.75 g GP/kg diet, respectively and the group 5th, 6th, and 7th were fed on the basal diet plus 0.25, 0.50, and 0.75 g PA/kg diet. Results: Broiler body weight and gain at 21 and 42 days were increased (p<0.05) with diets supplemented with GP and PA. Red blood cells and hemoglobin were improved in chickens fed diets enriched with GP. Broiler chickens received diets containing either GP or PA recorded the higher values (p<0.05) of total protein, globulin, high-density lipoprotein, immunoglobulin M (IgM), and IgG, superoxide dismutase and total antioxidant capacity; while, blood total cholesterol, low-density lipoprotein, aspartate-aminotransferase, and malondialdehyde were lowered (p<0.05) compared to control-diet. Liver and immune-related organs weight were improved (p<0.05) in broilers fed diet supplemented with GP and PA. Conclusion: Feeding of GP or PA in diet had positive effects on performance traits and immunological, antioxidant and physiological status of broilers. Thus, the use of tested feed additives as an eco-friendly alternative to antibiotics produced a positive effect on animal health. Objective: The effect of garlic powder (GP) and phenyl acetic (PA) acid throughout the fattening period of broiler chickens on performance, blood parameters, immune, and antioxidant parameters as well as carcass traits was evaluated.Methods: A total of 210 day-old Cobb broiler chicks were randomly distributed into seven dietary treatments having five replications with six chicks per replicate. The first group (control) fed a basal diet without supplements, whereas the 2nd, 3rd, and 4th group were fed basal diet plus 0.25, 0.50, and 0.75 g GP/kg diet, respectively and the group 5th, 6th, and 7th were fed on the basal diet plus 0.25, 0.50, and 0.75 g PA/kg diet.Results: Broiler body weight and gain at 21 and 42 days were increased (p<0.05) with diets supplemented with GP and PA. Red blood cells and hemoglobin were improved in chickens fed diets enriched with GP. Broiler chickens received diets containing either GP or PA recorded the higher values (p<0.05) of total protein, globulin, high-density lipoprotein, immunoglobulin M (IgM), and IgG, superoxide dismutase and total antioxidant capacity; while, blood total cholesterol, low-density lipoprotein, aspartate-aminotransferase, and malondialdehyde were lowered (p<0.05) compared to control-diet. Liver and immune-related organs weight were improved (p<0.05) in broilers fed diet supplemented with GP and PA.Conclusion: Feeding of GP or PA in diet had positive effects on performance traits and immunological, antioxidant and physiological status of broilers. Thus, the use of tested feed additives as an eco-friendly alternative to antibiotics produced a positive effect on animal health.

Histopathologic Biomarker Response of Clam, Ruditapes decussates, to Organophosphorous Pesticides Reldan and Roundup: A Laboratory Study

Nahla S. El-Shenawy,Tarak I. S. Moawad,Mahmoud E. Mohallal,Ismail M. Abdel-Nabi,Inas A. Taha 한국해양과학기술원 2009 Ocean science journal Vol.44 No.1

Clam Ruditapes decussates was used as a biomonitoring organism to measure the potential impact of pollution. The present study investigated histological alterations of R. decussates following a long-term exposure to a sublethal-level of pesticides Reldan and Roundup. The clams were taken to the laboratory and kept for days to adjust to a continuous closed flow system with quality water control. After the adjustment period, clams were exposed either to sublethal concentrations of Reldan (0.6 μl L−1) or Roundup (1.1 μl L−1) for 90 days. Clams were taken to determine the histological damage at 30, 60 and 90 days. Most histological alterations were highly localized in the glandular cells of the gills, mantle tissues and digestive gland; secretions of glandular cells were found to be increased by increasing the time of exposure. Histopathological results showed the activation of resistance mechanisms that allowed the clams to survive under sublethal stresses. Thus, histological changes on localized tissues were sensitive and they have positive correlation to the time of exposure to the pesticides, suggesting that they may serve as biomarkers for Reldan and Roundup exposures. Clam Ruditapes decussates was used as a biomonitoring organism to measure the potential impact of pollution. The present study investigated histological alterations of R. decussates following a long-term exposure to a sublethal-level of pesticides Reldan and Roundup. The clams were taken to the laboratory and kept for days to adjust to a continuous closed flow system with quality water control. After the adjustment period, clams were exposed either to sublethal concentrations of Reldan (0.6 μl L−1) or Roundup (1.1 μl L−1) for 90 days. Clams were taken to determine the histological damage at 30, 60 and 90 days. Most histological alterations were highly localized in the glandular cells of the gills, mantle tissues and digestive gland; secretions of glandular cells were found to be increased by increasing the time of exposure. Histopathological results showed the activation of resistance mechanisms that allowed the clams to survive under sublethal stresses. Thus, histological changes on localized tissues were sensitive and they have positive correlation to the time of exposure to the pesticides, suggesting that they may serve as biomarkers for Reldan and Roundup exposures.

DJ-1 upregulates breast cancer cell invasion by repressing KLF17 expression

Ismail, I A,Kang, H S,Lee, H-J,Kim, J-K,Hong, S-H Nature Publishing Group 2014 The British journal of cancer Vol.110 No.5

<P><B>Background:</B></P><P>DJ-1 (PARK7) was reported as an oncogene in a Ras-dependent manner. Recent studies have shown that DJ-1 stimulates cell proliferation, cell invasion, and cancer metastasis. However, the molecular mehchanism by which DJ-1 induces cancer cell invasion and metastasis remains unclear.</P><P><B>Methods:</B></P><P>Breast cancer cells were transfected with DJ-1 siRNA or DJ-1 overexpression to investigate the effect of DJ-1 on KLF17 expression. ID-1 luciferase promoter assay was performed to evaluate DJ-1-dependent KLF17 expression changes. In addition, Epistasis analysis of DJ-1 and KLF17 was performed to evaluate their regulatory interactions. Ras inhibitors were pretreated to determine whether DJ-1 regulates cell invasion in a Ras-dependent manner.</P><P><B>Results:</B></P><P>In the present study, we found increased DJ-1 expression in highly invasive breast cancer cells as compared with non-metastatic cells. Furthermore, DJ-1 promoted breast cancer cell invasion by downregulating E-cadherin and increasing Snail expression. Interestingly, exogenous DJ-1 overexpression markedly decreased mRNA and protein expression of KLF17, the EMT negative regulator. These data were confirmed by ID-1 promoter activity, which is directly regulated by DJ-1-dependent KLF17 transcription factor. Epistasis analysis showed that KLF17 overexpression overcomes increased cell invasion by DJ-1, suggesting that KLF17 might be one of the downstream signalling molecules of DJ-1. Acceleration of cell invasion by DJ-1 was alleviated by Ras inhibitors, suggesting that DJ-1 cooperates with Ras to increase cell invasion.</P><P><B>Conclusion:</B></P><P>Altogether, these data suggest for the first time that DJ-1 acts as an EMT-positive regulator in breast cancer cells via regulation of the KLF17/ID-1 pathway.</P>

Spectral Solution of Poisson Equation over Infinite Branched Channel

I. A. Ismail,G. Ismail,A. M. Sedqi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2

In this paper, we present a direct spectral collocation method for solving Poisson equation in polar coordinates. This equation is expressed spectrally over the unit circle. The resulting equation in spectral form is solved to give a solution to Poisson equation with Dirichlet boundary conditions at collocation points. The unit circle domain is conformally transformed to Y-geometry, retaining the value of the solution to give the solution of the same problem over Y-shape channel. Poisson equation can be solved similarly over many other geometries. The method is easy to implement, fast and gives spectral accuracy.

FREQUENCY DISTRIBUTION OF HII REGIONS RADII AS A DISTANCE INDICATOR

ISMAIL H. A.,ALAWY A. E.,TAKEY A. S.,ISSA I. A.,SELIM H. H. The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.1

The frequency distribution of HII regions radii in our galaxy has been investigated. The correlation between the number of these regions and their radii has been re-determined, and could be represented by an exponential function. The size distribution of the HII regions in 10 spiral galaxies has been derived and combined with that of our galaxy to derive the distances of these galaxies. It has been found that the distances derived are in a good agreement with the published ones. The interstellar extinction in the galaxies has no influence on the distance estimate when using this geometrical method.

Evaluation of cellulose acetate membrane with carbon nanotubes additives

L.A. Nezam El-Din,A. El-Gendi,N. Ismail,K.A. Abed,Awd I. Ahmed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-

Cellulose acetate (CA)/carbon nano tubes (CNT) membranes were prepared using phase inversion method by dispersing different ratio of carbon nano-materials in CA casting solution. Different polymer to solvent ratios examined for enhancement of membrane desalination. The influence of differentiation in CA and CNT ratio on the morphology and thermal stability were investigated using scanning electron microscopy and thermogravimetric analysis (TGA). Also, Permeation performance of the prepared membranes was evaluated. Morphology results showed that CA membrane porosity decreased with increasing polymer ratio. The membranes pure water flux was increased by the addition of nano-carbon materials. The optimum polymer to solvent ratio for accepted desalination performance was 25:75. The presence of carbon nanotubes (CNT) in the optimum membrane enhanced the salt rejection markedly to 96% as well as the pure water flux has been improved. The optimum membrane in the presence of CNT has convenient thermal stability with accepted water content percent and swelling percent.

Analysis of the machinability of GFRE composites in drilling processes

Usama. A. Khashaba,Mohamed S. Abd-Elwahed,Khaled I. Ahmed,Ismail Najjar,Ammar Melaibari,Mohamed A Eltaher 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.4

Drilling processes in fiber-reinforced polymer composites are essential for the assembly and fabrication of composite structural parts. The economic impact of rejecting the drilled part is significant considering the associated loss when it reaches the assembly stage. Therefore, this article tends to illustrate the effect of cutting conditions (feed and speed), and laminate thickness on thrust force, torque, and delamination in drilling woven E-glass fiber reinforced epoxy (GFRE) composites. Four feeds (0.025, 0.05, 0.1, and 0.2 mm/r) and three speeds (400, 800, and 1600 RPM) are exploited to drill square specimens of 36.6x36.6 mm, by using CNC machine model “Deckel Maho DMG DMC 1035 V, ecoline”. The composite laminates with thicknesses of 2.6 mm, 5.3 mm, and 7.7 mm are constructed respectively from 8, 16, and 24 glass fiber layers with a fiber volume fraction of about 40%. The drilled specimen is scanned using a high-resolution flatbed color scanner, then, the image is analyzed using CorelDraw software to evaluate the delamination factor. Multi-variable regression analysis is performed to present the significant coefficients and contribution of each variable on the thrust force and delamination. Results illustrate that the drilling parameters and laminate thickness have significant effects on thrust force, torque, and delamination factor.