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Search Results: 1 - 10 of 214080 matches for " I. K. Battisha "
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Physical Study of Thin Film and Monolithic Nano-Composites [SiO2: 11P2O5: 3 Al2O3: (1.2) Er (1.2, 1.8 and 3) Yb] Prepared by Sol Gel Technique, Planar Waveguide and Co-Operative Up-Conversion  [PDF]
Y. Badr, I. K. Battisha, A. M. S. El Nahrawy, M. Kamal
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.12012
Abstract: Nano-composite silica-phosphate system (SiO2- P2O5) co-doped with Al2O3 as a host material and prepared by sol gel technique in two forms monolith and thin film using multilayer spin-coating method were activated by Er3+ and Yb3+ ions as in the formula;[SiO2: 11P2O5: 3 Al2O3: (1.2) Er: (1.2, 1.8 and 3) Yb]. The prepared samples have been synthesized using tetra-ethyl-orthosilicate (TEOS) and triethyl-phosphate (TEP) as precursor sources of silica and phospho-rus oxides. The microstructure and crystallinity of the prepared samples will be characterized by using x-ray diffraction (XRD) which, imply that the crystallite sizes of [SiO2: 11P2O5: 3 Al2O3: (1.2) Er: (1.2) Yb] at 500oC for both thin film and monolith forms of the prepared samples were found to be equal to 35 and 33 nm, respectively. The refractive index will be evaluated by measuring the normal transmission and specular reflection of the prepared samples. The photolu-minescence properties have analyzed in the visible wavelength range between 500 and 800 nm as a function of sample composition.
Synthesis and Characterization of Triply Doped Nano-Composite Alumina-Phospho- Silicates SiO2-P2O5-Al2O3 with Er3+, Sm3+ and Yb3+ Ions Prepared by Sol Gel Technique in Two Different Forms Thin Film and Monolith  [PDF]
I. K. Battisha, M. A. Salem, Y. Badr, M. Kamal, A. M. S. El Nahrawy
New Journal of Glass and Ceramics (NJGC) , 2016, DOI: 10.4236/njgc.2016.61001
Abstract: Nano-composite monolith and thin film Alumina-Phospho-Silicates (SiO2-P2O5-Al2O3):Ln (Ln = Sm, Er, Yb) glasses activated by triply doped with three different rare earth ions (REIs) (Er3+:Yb3+:Sm3+) were prepared by modified sol-gel process. The composition of the prepared samples was as follow (SiO2:11P2O5:3Al2O3:1.2Er2O3:(1.2 - 3)Yb2O3:(0.7 - 1.3)Sm2O3). Tetra-ethyl-orthosilicate (TEOS), tri-ethyl-phosphate (TEP), erbium nitrate, ytterbium nitrate and samarium nitrate were used as precursor materials, respectively. The structure of the prepared samples was studied using X-ray diffraction (XRD), which revealed that the crystallite sizes of monolith and thin film samples both sintered at 900℃?at constant Sm3+ concentration at 1.3 mol% (SPAE1.2Y1.8S1.3) have the following values 44 and 31 nm, respectively. Transmission Electron Microscopy (TEM) of the same prepared samples was used to confirm the presence of nano-structure phase. The photo-luminescence study will be evaluated for the prepared.

Semiconductor ZnO Nano-Rods Thin Film Grown on Silver Wire for Hemoglobin Biosensor Fabrication  [PDF]
I. K. Battisha, H. A. Wahab, A. A. Salama, A. A. El Saeid, M. Willander, O. Nur
New Journal of Glass and Ceramics (NJGC) , 2015, DOI: 10.4236/njgc.2015.52002
Abstract: Wurtzite hexagonal ZnO semiconductor nano-rods (NRs) thin films were grown on silicon substrates and silver wire with diameter equal 68 nm. Sol gel (SG) and aqueous chemical growth (ACG) methods by two steps of preparation (seed layers and nano-rod growth) are used for samples preparation. The structural and morphological properties are evaluated using X-ray diffraction (XRD) and scanning electron microscope (SEM). The proposed iron ion sensor has shown good linearity for a wide concentration range from 0.078 M/L to 0.26 M/L of iron ions. The results show that the electrode is highly sensitive to iron ions with a slope around 47.8 mV/decade with a regression coefficient R2 = 0.96.
Determination of A.C. Conductivity of Nano-Composite Perovskite Ba(1- x - y)Sr(x)TiFe(y)O3 Prepared by the Sol-Gel Technique  [PDF]
M. Willander, O. Nur, M. Q. Israr, A. B. Abou Hamad, F. G. El Desouky, M. A. Salem, I. K. Battisha
Journal of Crystallization Process and Technology (JCPT) , 2012, DOI: 10.4236/jcpt.2012.21001
Abstract: Nano-composite, perovskite Ba(1- x - y)Sr(x)TiFe(y)O3, denoted as (BSTFe) in powder form was derived via sol-gel (SG) method followed by sintering at fixed temperature 750℃ for one hour. The chemical composition, morphology and structure of the powder samples were investigated by using X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The XRD characterization indicates formation of a cubic crystalline phase in the pure BST. A well defined perovskite phase with nano-crystallite sizes equal to about 34 nm was achieved from XRD for B10ST3F sample, while TEM study confirmed the obtained XRD results giving the following crystallite size value about 33.75 nm for the same sample. The dielectric A.C. conductivity was evaluated as a function of temperature and frequency ranging from 42 Hz up to 1 MHz.
Dielectric Behavior of Some Vinyl Polymers/Montmorillonite Nanocomposites on the Way to Apply Them as Semiconducting Materials  [PDF]
Amal Amin, Eman H. Ahmed, Magdy W. Sabaa, Magdy M. H. Ayoub, Inas K. Battisha
Open Journal of Organic Polymer Materials (OJOPM) , 2013, DOI: 10.4236/ojopm.2013.33012

Some vinyl polymers/montmorillonite nanocomposites were prepared via in-situ-atom transfer radical polymerization (ATRP) in presence of clay. Methyl methacrylate, styrene and n-butyl methacrylate were involved in the formation of such polymeric nanocomposites. Their dielectric properties were extensively studied to invest them in the a.c. power applications. Several dielectric parameters such as dielectric constant loss (ε\") and a.c. conductivity (σ) were measured at both different frequencies (0.1 Hz to 100 KHz) and temperature ranged from (20 to 90). From the dielectric results, it was realized that the dielectric a.c. conductivity was enhanced by increasing the temperature for the four prepared polymer nanocomposites.

Physical Properties of Nano-Composite Silica-Phosphate Thin Film Prepared by Sol Gel Technique  [PDF]
Amany El Nahrawy, Inas Battisha
New Journal of Glass and Ceramics (NJGC) , 2012, DOI: 10.4236/njgc.2012.21004
Abstract: 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).
Pressure Transient Analysis of an Intersecting Rollover Faulted Crest Boundary in Niger Delta Oil Field  [PDF]
K. K. Ihekoronye, I. P. Nwosu
Open Journal of Yangtze Oil and Gas (OJOGas) , 2019, DOI: 10.4236/ojogas.2019.42010
Abstract: Pressure transient analysis has been extensively applied to detect anomalies in a reservoir system. These anomalies may be presented in the form of an intersection of the crestal and the antithetic fault associated with a growth fault. Interpretation of this fault can only be achieved through the use of pressure transient analysis. The objective of the research work is to analyze and test the faulted crest, depth of the anticline structure and examine the near well bore conditions in order to evaluate whether the well productivity is governed by wellbore effects (skin effects + well bore effect) or the reservoir at large. A case study of a well in the Niger delta is considered with a series of build up test carried out in two intervals of both upper and lower gauge readings. In this study, a computer aided design which uses a pressure derivative approach is used in this work to match the pressure derivative of an intersecting fault (angle) model to the field data, and the model assumes the characteristics of the reservoir. Based on the result of the interpreted data, simulation is done by using a non linear regression method (least square). The simulated data interpreted are achieved through the regression coefficient which provides a quantitative measure of the agreement between field data and the model. In conclusion, the best cases are taken from all the results and a nodal analysis is performed to diagnose the inflow performance of the well through the transient analysis in order to optimize the recovery of the oilfield.
On Second-Order Duality in Nondifferentiable Continuous Programming  [PDF]
I. Husain, Santosh K. Shrivastav
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.23035
Abstract: A Mond-Weir type second-order dual continuous programming problem associated with a class of nondifferentiable continuous programming problems is formulated. Under second-order pseudo-invexity and second-order quasi-invexity various duality theorems are established for this pair of dual continuous programming problems. A pair of dual continuous programming problems with natural boundary values is constructed and the proofs of its various duality results are briefly outlined. Further, it is shown that our results can be regarded as dynamic generalizations of corresponding (static) second-order duality theorems for a class of nondifferentiable nonlinear programming problems already studied in the literature.
Optimality Conditions and Second-Order Duality for Nondifferentiable Multiobjective Continuous Programming Problems  [PDF]
I. Husain, Vikas K. Jain
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.24063
Abstract: Fritz John and Karush-Kuhn-Tucker type optimality conditions for a nondifferentiable multiobjective variational problem are derived. As an application of Karush-Kuhn-Tucker type optimality conditions, Mond-weir type second-order nondifferentiable multiobjective dual variational problems is constructed. Various duality results for the pair of Mond-Weir type second-order dual variational problems are proved under second-order pseudoinvexity and second-order quasi-invexity. A pair of Mond-Weir type dual variational problems with natural boundary values is formulated to derive various duality results. Finally, it is pointed out that our results can be considered as dynamic generalizations of their static counterparts existing in the literature.
Age Estimation And Masss Functions of TTauri Stars in The Taurus Auriga Molecular Cloud
Kü?ük, I.;Akkaya, I.;
Revista mexicana de astronomía y astrofísica , 2010,
Abstract: in this work the present day mass functions (pdmf) of t-tauri stars (tts) which are in the pre-main sequence (pms) evolutionary phase of their evolution in the taurus-auriga molecular cloud complex have been calculated. for this purpose, by applying our modified stellar evolutionary code, stellar models in the mass range 0.1 - 2.5 are used to determine the mass and age mass of tts. the obtained mass function is compared with the mass function of miller & scalo (1979). the age found for tts is around 1 - 3 × 106 yr and the mass function is about 0.6440.348. from these results, we have calculated the stellar birthrate as about 1.3 × 10-7 yr -1 in this region.
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