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Articles 6091 - 6120 of 10319
Full-Text Articles in Physical Sciences and Mathematics
An Efficient Synthesis Of Some New Bisbenzimidazoles Via Microwave Technique, Bahi̇tti̇n Kahveci̇, Nesri̇n Karaali̇, Fati̇h Yilmaz, Emre Menteşe
An Efficient Synthesis Of Some New Bisbenzimidazoles Via Microwave Technique, Bahi̇tti̇n Kahveci̇, Nesri̇n Karaali̇, Fati̇h Yilmaz, Emre Menteşe
Turkish Journal of Chemistry
2,2'-[1,4 (1,3)-Phenylenedi(methylene)]bis-1H-benzimidazole derivatives were obtained from the reaction of 1,4- or (1,3)-bisiminoester hydrochloride and o-phenylenediamine derivatives under microwave irradiation. Ester and hydrazide derivatives were prepared from a free NH group. This practical method revealed good results for yield, reaction time, and quick isolation of products.
Spectroscopic Investigation And Oxidation Of The Anticholinergic Drug Atropine Sulfate Monohydrate By Hexacyanoferrate(Iii) In Aqueous Alkaline Media: A Mechanistic Approach, Manjunath Meti, Sharanappa Nandibewoor, Shivamurti Chimatadar
Spectroscopic Investigation And Oxidation Of The Anticholinergic Drug Atropine Sulfate Monohydrate By Hexacyanoferrate(Iii) In Aqueous Alkaline Media: A Mechanistic Approach, Manjunath Meti, Sharanappa Nandibewoor, Shivamurti Chimatadar
Turkish Journal of Chemistry
The oxidation of the anticholinergic drug atropine sulfate monohydrate by hexacyanoferrate(III) in aqueous alkaline media was investigated spectrophotometrically by monitoring the decrease in absorbance of hexacyanoferrate(III) (HCF(III)). Oxidation products were identified. The oxidation mechanism was proposed from kinetic studies. The reaction constants involved in the different steps of the mechanism were calculated. The effects of added products, ionic strength, and dielectric constant of the reaction were investigated. The polymerization test revealed that oxidation occurred with intervention of free radicals. The activation parameters were evaluated.
Selective Oxidation Of Sulfides And Hydrocarbons With H_2o_2 Over Manganese Catalyst Supported On Nanoparticles, Massomeh Ghorbanloo, Roghayeh Tarasi, Jun Tao, Hidenori Yahiro
Selective Oxidation Of Sulfides And Hydrocarbons With H_2o_2 Over Manganese Catalyst Supported On Nanoparticles, Massomeh Ghorbanloo, Roghayeh Tarasi, Jun Tao, Hidenori Yahiro
Turkish Journal of Chemistry
A new magnetically separable catalyst consisting of binuclear Mn(II) complex [Mn_2(HL)_2(H_2O)_4], HL = 2-[(2-hydroxy-benzylidene)-amino]-3-(4-hydroxyphenyl)-propionic acid, supported on (3-chloropropyl)-trimethoxysilane (CPTMS) functionalized silica-coated magnetic nanoparticles (MNPs) was prepared. The synthesized catalyst was characterized by several physico-chemical and spectroscopic methods. This immobilized complex was found to be an efficient heterogeneous catalyst for the oxidation of different sulfides and hydrocarbons using hydrogen peroxide (H_2O_2) as an oxidant. The catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no considerable loss of catalytic activity.
Synthesis, Spectral Characterisation, Electrochemical, And Fluorescence Studies Of Biologically Active Novel Schiff Base Complexes Derived From E-4-(2-Hydroxy-3-Methoxybenzlideneamino)-N-(Pyrimidin-2-Yl)Benzenesulfonamide, Valarmathy Govindaraj, Subbalakshmi Ramanathan
Synthesis, Spectral Characterisation, Electrochemical, And Fluorescence Studies Of Biologically Active Novel Schiff Base Complexes Derived From E-4-(2-Hydroxy-3-Methoxybenzlideneamino)-N-(Pyrimidin-2-Yl)Benzenesulfonamide, Valarmathy Govindaraj, Subbalakshmi Ramanathan
Turkish Journal of Chemistry
A new Schiff base was prepared from 2-sulphanilamidopyrimidine and 2-hydroxy-3-methoxybenzaldehyde in ethanolic media and it was complexed with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) ions. The synthesised ligand and complexes were characterised by IR, UV, ^1H and ^{13}C NMR, elemental analysis, cyclic voltammetry, EPR, molar conductance, and magnetic susceptibility. The reasonable shifts in FT-IR and NMR spectral signals of the complexes with respect to the free ligand confirm good coordination of the Schiff-base ligand with the metal through imine nitrogen and oxygen atoms of Schiff base moiety. The Schiff-base ligand and the complexes were screened for antimicrobial activity and fluorescent …
Development Of 2-Acetylpyridine-4-Phenyl-3-Thiosemicarbazone Functionalized Polymeric Resin For The Preconcentration Of Metal Ions Prior To Their Ultratrace Determinations By Mis-Faas, Ali Nawaz Siyal, Saima Qayoom Memon, Aydan Elçi̇, Ümi̇t Di̇vri̇kli̇, Muhammad Yar Khuhawar, Lati̇f Elçi̇
Development Of 2-Acetylpyridine-4-Phenyl-3-Thiosemicarbazone Functionalized Polymeric Resin For The Preconcentration Of Metal Ions Prior To Their Ultratrace Determinations By Mis-Faas, Ali Nawaz Siyal, Saima Qayoom Memon, Aydan Elçi̇, Ümi̇t Di̇vri̇kli̇, Muhammad Yar Khuhawar, Lati̇f Elçi̇
Turkish Journal of Chemistry
2-Acetylpyridine-4-phenyl-3-thiosemicarbazone (APPT) ligand was incorporated onto Amberlite XAD-2 resin through an azo spacer and characterized by FTIR spectroscopy, elemental analysis, TGA, and SEM analysis. The synthesized resin was used for the preconcentration of Pb(II), Zn(II), Co(II), Ni(II), Cu(II), and Cd(II) ions. The sorbed metal ions were eluted with 10 mL of 2.0 mol L^{-1} HCl and determined by microsample injection coupled flame atomic spectrometry (MIS-FAAS). The recoveries of studied metal ions were \ge 95.1 % with RSD \ge 4.0 % at optimum pH 8; resin amount, 300 mg; flow rates, 2.0 mL min^{-1} (of eluent) and 3.0 mL min^{-1} (sample …
Synthesis Of Novel Imidazo[1,2-A]Pyridines And Evaluation Of Their Antifungal Activities, Füsun Göktaş, Nesri̇n Cesur, Di̇lek Şatana, Meltem Uzun
Synthesis Of Novel Imidazo[1,2-A]Pyridines And Evaluation Of Their Antifungal Activities, Füsun Göktaş, Nesri̇n Cesur, Di̇lek Şatana, Meltem Uzun
Turkish Journal of Chemistry
New 2-(imidazo[1,2-a]pyridin-2-ylcarbonyl)-N-substituted hydrazinecarbothioamides (4a--j), N'-(3-substituted-4-oxo-1,3-thiazolidin-2-ylidene)imidazo[1,2-a]pyridine-2-carbohydrazides (5a--f), and N-(nonsubstituted/4-substituted phenyl)-5-(imidazo[1,2-a]pyridine-2-yl)-1,3,4-oxadiazole-2-amines (6a--d) were synthesized from imidazo[1,2-a]pyridine-2-carbohydrazide (3) and evaluated for antifungal activity against Microsporum gypseum NCPF 580, M. canis, Trichophyton tonsurans NCPF 245, T. rubrum, Candida albicans ATCC 10231, and C. parapsilosis ATCC 22019 using amphotericin B as the standard. The chemical structures of the compounds were confirmed by elemental analysis, IR, ^1H NMR, ^{13}C NMR, HMBC (^{13}C, ^1H), and mass spectra. Most of the tested compounds showed moderate antifungal activity. Hydrazinecarbothioamide derivatives 4h and 4f exhibited the highest activity against M. canis (MIC: 2 \mu g mL^{-1} and 4 \mu g …
Convenient Synthesis Of New Polysubstituted Isoindole-1,3-Dione Analogues, Ayşe Tan, Mustafa Zahri̇tti̇n Kazancioğlu, Derya Aktaş, Özlem Gündoğdu, Ertan Şahi̇n, Nurhan Ki̇shali, Yunus Kara
Convenient Synthesis Of New Polysubstituted Isoindole-1,3-Dione Analogues, Ayşe Tan, Mustafa Zahri̇tti̇n Kazancioğlu, Derya Aktaş, Özlem Gündoğdu, Ertan Şahi̇n, Nurhan Ki̇shali, Yunus Kara
Turkish Journal of Chemistry
Three new polysubstituted isoindole-1,3-diones were prepared from 2-ethyl-5-hydroxy-3a,4,5,7a-tetrahydro-isoindole-1,3-dione. The reaction of 2-ethyl-5-hydroxy-3a,4,5,7a-tetrahydro-isoindole-1,3-dione with m-CPBA gave the corresponding epoxide. The triacetate derivative was obtained via cis-hydroxylation using OsO_4, followed by acetylation. An aromatic derivative, a secondary reaction product, was also formed during the acetylation. Finally, a tricyclic derivative from 2-ethyl-5-hydroxy-3a,4,5,7a-tetrahydro-isoindole-1,3-dione was synthesized via dichloroketene addition under microwave irradiation. The exact structures of epoxide and tricyclic derivatives were determined by X-ray diffraction analysis.
Effects Of Functional Groups Of Triple Bonds Containing Molecules On Nickel Electroplating, Esma Sezer, Belkiz Ustamehmetoğlu, Ramazan Katirci
Effects Of Functional Groups Of Triple Bonds Containing Molecules On Nickel Electroplating, Esma Sezer, Belkiz Ustamehmetoğlu, Ramazan Katirci
Turkish Journal of Chemistry
The effects of propargyl alcohol (PA), propynol ethoxylate (PME), propargyl sulfonate (PS), and diethylaminopropyne (DEP) compounds as additives in a Watts bath on coating brightness, thickness, and efficiency were investigated and compared using electrochemical methods such as linear and square wave voltammetry (SWV), chronoamperometry, chronopotentiometry, electrochemical impedance (EIS), and X-ray fluorescence (XRF) spectroscopy. The charge transfer resistance values obtained in the presence of PA and PME were similar and higher than the other values obtained; this result suggests that PA and PME have better adsorption. The optic and XRF measurements revealed that for the PS molecule the plating is the …
Qsar Study Of Chalcone Derivatives As Anti-Leishmania Agents, Maryam Iman, Asghar Davood, Nasim Banarouei
Qsar Study Of Chalcone Derivatives As Anti-Leishmania Agents, Maryam Iman, Asghar Davood, Nasim Banarouei
Turkish Journal of Chemistry
Quantitative structure activity relationship analyses were used to identify the ideal physicochemical characteristics of potential chalcone derivatives as anti-Leishmania agents. The HyperChem program was used to build chalcone structures and to perform conformational analyses through the semiempirical method followed by the PM3 force field. Dragon calculated a large number of molecular descriptors. Multilinear regression was used for quantitative structure activity relationship modeling. Based on our computational studies, 4 descriptors, SEigv, RDF125v, RDF055u, and O-058, can affect the activity of chalcone derivatives.
Performance Degradation Of Li_Xfepo_4 (X = 0, 1) Induced By Postannealing, Xiaofei Sun, Youlong Xu, Xiaoyu Zheng, Xiangfei Meng, Rui Zhang
Performance Degradation Of Li_Xfepo_4 (X = 0, 1) Induced By Postannealing, Xiaofei Sun, Youlong Xu, Xiaoyu Zheng, Xiangfei Meng, Rui Zhang
Turkish Journal of Chemistry
Olivine LiFePO_4 has been studied for more than a decade as a promising cathode material for rechargeable lithium batteries. However, the low electric conductivity and tap density still hinder its large-scale commercialization. Micro-sized LiFePO_4 is prepared by an optimized hydrothermal method in this paper. The influence of postannealing on the physicochemical properties of LiFePO_4 and FePO_4 is investigated to understand the plausible mechanism for performance degradation. It is found that postannealing even chemical delithiation greatly affects the particle size, morphology, pore distribution, surface area, and probably the lattice strain of Li_xFePO_4 (x = 0, 1). Consequently, the electrochemical performances of …
Novel Metal-Free And Metallophthalocyanines Containing Four 21-Membered Pentathiadiaza Macrocycles: Synthesis, Characterization, And Study Of Aggregation Properties, Hali̇l Zeki̇ Gök, Berna Farsak, Hülya Keleş, Mustafa Keleş
Novel Metal-Free And Metallophthalocyanines Containing Four 21-Membered Pentathiadiaza Macrocycles: Synthesis, Characterization, And Study Of Aggregation Properties, Hali̇l Zeki̇ Gök, Berna Farsak, Hülya Keleş, Mustafa Keleş
Turkish Journal of Chemistry
Metal-free phthalocyanine 3 and its metallophthalocyanine derivatives 4, 5, and 6 (M = Zn, Co, and Ni) substituted with four 21-membered pentathiadiaza macrocycles were synthesized and their structures identified by elemental analysis, IR, ^1H NMR, mass, and UV-Vis spectroscopy techniques. The aggregation properties of phthalocyanines 4, 5, and 6 were investigated in different solvents and at different concentrations of dimethylformamide.
Synthesis And Characterization Of Novel 2-{[2-(Dimethylamino)Ethyl](Methyl)Amino} Ethoxy-Substituted Metallophthalocyanines, Hi̇lal Zengi̇n, Hacer Yasemi̇n Yeni̇lmez, Ayfer Kalkan Burat, Zehra Altuntaş Bayir
Synthesis And Characterization Of Novel 2-{[2-(Dimethylamino)Ethyl](Methyl)Amino} Ethoxy-Substituted Metallophthalocyanines, Hi̇lal Zengi̇n, Hacer Yasemi̇n Yeni̇lmez, Ayfer Kalkan Burat, Zehra Altuntaş Bayir
Turkish Journal of Chemistry
The synthesis of novel, symmetrical, tetrasubstituted metallophthalocyanines (cobalt, zinc, and copper) bearing four 2-{[2-(dimethylamino)ethyl](methyl)amino} ethoxy units was reported. The dinitrile derivative was converted into the water-soluble quaternized product by its reaction with methyl iodide. The quaternized zinc phthalocyanine was obtained from the reaction of the water-soluble dinitrile derivative with zinc acetate. The structures of the newly synthesized molecules were proposed according to elemental analysis, ^1H NMR, FT-IR, and UV-Vis spectral data.
Synthesis And Spectral And Thermal Characterization Of New Metal-Free And Metallophthalocyanines: Investigation Of Their Photophysical, Photochemical, And Thin Film Properties, Eli̇f Çelenk Kaya, Mahmut Durmuş, Ekrem Yanmaz, Hali̇t Kanteki̇n
Synthesis And Spectral And Thermal Characterization Of New Metal-Free And Metallophthalocyanines: Investigation Of Their Photophysical, Photochemical, And Thin Film Properties, Eli̇f Çelenk Kaya, Mahmut Durmuş, Ekrem Yanmaz, Hali̇t Kanteki̇n
Turkish Journal of Chemistry
Novel tetrasubstituted metal-free (2), zinc (II) (3), cobalt (II) (4), and copper (II) (5) phthalocyanines bearing 2-phenylethanolate groups on the peripheral positions were synthesized by the cyclotetramerization reaction of the phthalonitrile derivative 1. The new compounds were characterized by a combination of IR, ^1H NMR, ^{13}C NMR, UV-Vis, elemental analysis, and MS spectra data. The thermal stabilities of the phthalocyanine compounds were determined by thermogravimetric analysis. For metal-free (2) and zinc (3) phthalocyanines, photochemical (photodegradation and singlet oxygen quantum yields) and photophysical (fluorescence quantum yields and fluorescence lifetimes) properties were analyzed in dimethylsulfoxide (DMSO). The cobalt (4) and copper (5) …
Quaternary Travertine Ridges In The Lake Urmia Area: Active Extension In Nw Iran, Mohammad Mohajjel, Karim Taghipour
Quaternary Travertine Ridges In The Lake Urmia Area: Active Extension In Nw Iran, Mohammad Mohajjel, Karim Taghipour
Turkish Journal of Earth Sciences
The Lake Urmia area is surrounded by several major active oblique-slip faults with dextral and normal offsets. Extensive travertine ridges were produced along the E-W up to NW-SE trending extension fractures in the Lake Urmia area, NW Iran. These fractures are parallel to subparallel with abundant normal faults. Pliocene-Quaternary volcanic domes occur in the area and their activities tend toward apparent distinction between colored travertine layers and ridges. Two different modes of banded travertine within the fissures and layered travertine on the surface are observed. Some banded travertines are not vertical and obviously were tilted. Layered travertines were cut, rotated, …
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Turkish Journal of Earth Sciences
The neotectonics of the Zanjan-Kazvin area are dominated by the region-wide E-W trending left lateral strike-slip faults. These faults create restraining and releasing stepovers indicating strain partitioning. Instead of the NW-SE trending long range-parallel continuous thrust faulting suggested in previous studies, this paper demonstrates that there are E-W trending range-crossing left lateral strike-slip faults creating short range-parallel thrust faults in the restraining stepovers. Establishing this strike-slip-induced structural style might contribute to an understanding of the nature of the Elburz (Alborz) Mountains located between the Central Iran and Caspian blocks.
Evidence That Photons Have Extension In Space, Randy Wayne
Evidence That Photons Have Extension In Space, Randy Wayne
Turkish Journal of Physics
Satyendra Nath Bose realized that there was a logical inconsistency in the derivation of Planck's radiation law since the derivation used to obtain the temperature-independent prefactor in the blackbody radiation law had been based in part on classical wave hypotheses, such as the number of degrees of freedom of the ether. Bose worked out a strictly quantum derivation by combining the quantum hypothesis with statistical mechanics to determine the number of states of each mode that would occupy a 6-dimensional phase space. Here I use the model of an extended photon to show that the temperature-independent prefactor of Planck's radiation …
Soret And Dufour Effects On An Mhd Free Convective Flow Through A Channel Bounded By A Long Wavy Wall And A Parallel Flat Wall, Nazibuddin Ahmed, Kalpana Sarma, Hiren Deka
Soret And Dufour Effects On An Mhd Free Convective Flow Through A Channel Bounded By A Long Wavy Wall And A Parallel Flat Wall, Nazibuddin Ahmed, Kalpana Sarma, Hiren Deka
Turkish Journal of Physics
This paper presents Soret and Dufour effects on a 2-dimensional free convective magnetohydrodynamic (MHD) flow of a viscous incompressible and electrically conducting fluid through a channel bounded by a long vertical wavy wall and a parallel flat wall. A uniform magnetic field is assumed to be applied perpendicular to the flat wall. Governing equations of the fluid flow and heat and mass transfer are solved analytically subject to the relevant boundary conditions. It is assumed that the solution consists of 2 parts, a mean part and a perturbed part. The long wave approximation has been used to obtain the solution …
Effect Of Gain Saturation On The Nonlinear Dynamical Behavior Of Optically Injected Semiconductor Lasers, Furat Ahmad Al-Saymari, Imad Al-Deen Hussein Al-Saidi, May Jassim Ashoor
Effect Of Gain Saturation On The Nonlinear Dynamical Behavior Of Optically Injected Semiconductor Lasers, Furat Ahmad Al-Saymari, Imad Al-Deen Hussein Al-Saidi, May Jassim Ashoor
Turkish Journal of Physics
We studied numerically the dynamics and bifurcations route to chaos of an optically injected semiconductor laser. The sequence of bifurcations mainly followed the period-doubling scenario. Observations of different kinds of injected semiconductor laser dynamical behaviors including stable state, periodic oscillation state, quasi-periodic oscillation state, co-existence of periodic and chaotic states, and period-3 and period-6 oscillation states are reported. The existence of isolated branches created from a sudden jump in the dynamics of the semiconductor laser was also observed in the bifurcation diagram. In order to draw a detailed picture for the dynamical behavior of the semiconductor laser, we constructed color …
Properties Of Pbs Thin Films Grown On Glass And Layered Gase Crystal Substrates By Chemical Bath Deposition, Mevlüt Karabulut, Hüseyi̇n Ertap, Hasan Mammadov, Güventürk Uğurlu, Mustafa Kemal Öztürk
Properties Of Pbs Thin Films Grown On Glass And Layered Gase Crystal Substrates By Chemical Bath Deposition, Mevlüt Karabulut, Hüseyi̇n Ertap, Hasan Mammadov, Güventürk Uğurlu, Mustafa Kemal Öztürk
Turkish Journal of Physics
PbS thin films were grown on glass and GaSe crystal substrates by chemical bath deposition and their structural, morphological, optical, and electrical properties were investigated. PbS films grew in cubic structure with lattice constants equal to 5.9315 Å and 5.9362 Å for films grown on glass and GaSe crystal, respectively. The band gaps of the PbS films were determined to be 1.60 eV. The long wavelength tails of absorption spectra showed exponential dependence on the incident photon energy according to the Urbach-Martiensen model. Electrical properties of PbS films were investigated by the van der Pauw method, which showed that PbS …
Xrd, Xps, And Optical Characterizations Of Al-Doped Zno Film Grown On Gaas Substrate, Ebru Şenadim Tüzemen, Hülya Şahi̇n, Kamuran Kara, Sezai̇ Elagöz, Ramazan Esen
Xrd, Xps, And Optical Characterizations Of Al-Doped Zno Film Grown On Gaas Substrate, Ebru Şenadim Tüzemen, Hülya Şahi̇n, Kamuran Kara, Sezai̇ Elagöz, Ramazan Esen
Turkish Journal of Physics
A ZnO:Al (10%) thin film was prepared on GaAs(100) substrate by using a pulsed filtered cathodic vacuum arc deposition (PFCVAD) system. The ZnO:Al thin film was thermally annealed for 1 h at 2 different temperatures in air. The film structure was investigated as a function of annealing temperature by X-ray diffraction (XRD). ZnO:Al film annealed at 500 °C by PFCVAD method resulted in an amorphous film. However, after annealing ZnO:Al film at 600 °C, it showed (100) and (002) peaks at around 32° and 34°, respectively. The chemical state of ZnO:Al (AZO) film on GaAs substrate was investigated by using …
Structural, Physical, And Electrical Properties Of Boro-Vanadate-Iron Glasses Doped With K_2o Alkali, Harshvadan R. Panchal
Structural, Physical, And Electrical Properties Of Boro-Vanadate-Iron Glasses Doped With K_2o Alkali, Harshvadan R. Panchal
Turkish Journal of Physics
The structural, physical, and electrical properties of semiconducting oxide glasses with composition xK_2O: (95-X) [B_2O_3: 2V_2O_5]: 5Fe_2O_3 (0 \le x \le 30) have been studied. The glasses were prepared by splat-quenching method. Fourier transform infrared spectroscopy (FTIR) studies of these glasses were carried out to study the effect of the modifier and glass former in the glasses. These changes in the molecular structure, bond length, and vibrational group were studied in the spectral range of 400-1350 cm^{-1}. The increase in the intensity and shifting of vibrational bands occurred towards lower wave numbers at 1400-1350 cm^{-1}, 1200 cm^{-1}, and 100-940 cm^{-1}. …
Fast Numerical Algorithm For A High-Precision 6d Electromagnetic Positioning Navigation System, Qian Xiang, Shiqing Wang, Haifeng Liu
Fast Numerical Algorithm For A High-Precision 6d Electromagnetic Positioning Navigation System, Qian Xiang, Shiqing Wang, Haifeng Liu
Turkish Journal of Physics
A fast numerical algorithm is proposed for the 6 degrees of freedom electromagnetic navigation system, which can be used to improve surgical operations guided by medical images. Both the rotation transformation technique and optimization technique are adopted in the algorithm. The results from simulations show that the calculating time is improved greatly under the required precision in the surgery. A navigation system based on the algorithm can make the medical device's dimensions miniaturized and the structure simplified and portable. The performance and application scope of the electromagnetic positioning navigation system can be improved.
Octonion Symmetric Dirac-Maxwell Equations, Bhupesh Chandra Chanyal
Octonion Symmetric Dirac-Maxwell Equations, Bhupesh Chandra Chanyal
Turkish Journal of Physics
We know that the octonion algebra is the largest division algebra. Therefore, we have discussed the octonion 8-dimensional space as the combination of 2 (external and internal) 4-dimensional spaces. The octonion wave equations in terms of 8 components has been written in terms of an 8 x 8 matrix. Octonion forms of potential as well as fields equations of dyons in terms of an 8 x 8 matrix are discussed in a consistent manner. At last, we have obtained the generalized Dirac-Maxwell equations of dyons in two 4-dimensional spaces, from the 8 x 8 matrix representation of octonion wave equations. …
Incidence Angle And Spectral Effects On Vertical Junction Silicon Solar Cell Capacitance, Moustapha Sane, Gökhan Şahi̇n, Fabe Idrissa Barro, Amadou Seidou Maiga
Incidence Angle And Spectral Effects On Vertical Junction Silicon Solar Cell Capacitance, Moustapha Sane, Gökhan Şahi̇n, Fabe Idrissa Barro, Amadou Seidou Maiga
Turkish Journal of Physics
The aim of this work is to present a theoretical study of a vertical junction silicon solar cell under monochromatic illumination. By solving the continuity equation and using a one-dimensional model in frequency modulation, we derive the analytical expressions of both excess minority carrier density and photovoltage. Based on these expressions, the solar cell capacitance was calculated; we then exhibited the effects of both illumination wavelength and incidence angle on the solar cell capacitance.
Annealing Effects Of Zno Thin Films On P-Si(100) Substrate Deposited By Pfcvad, Kamuran Kara, Ebru Şenadim Tüzemen, Ramazan Esen
Annealing Effects Of Zno Thin Films On P-Si(100) Substrate Deposited By Pfcvad, Kamuran Kara, Ebru Şenadim Tüzemen, Ramazan Esen
Turkish Journal of Physics
In this study, ZnO films were prepared on p-Si substrates using the pulsed filtered cathodic vacuum arc deposition (PFCVAD) method. We report the effect of annealing temperature on structural and optical properties. The crystallographic structure and the size of the crystallites in the films were studied by means of X-ray diffraction. The films had a weak peak (100) orientation at 2theta = sim 32°. X-ray diffraction analysis of the as-deposited ZnO and the film annealed at 850 °C showed a strong ZnO (002) diffraction peak centered at 34.1° and 34.5°, respectively. The (004) peak was seen for film annealed at …
An Investigation On Silar Deposited Cu_Xs Thin Films, Aykut Astam, Yunus Akaltun, Muhammet Yildirim
An Investigation On Silar Deposited Cu_Xs Thin Films, Aykut Astam, Yunus Akaltun, Muhammet Yildirim
Turkish Journal of Physics
A copper sulfide thin film was deposited on glass substrate by successive ionic layer adsorption and reaction method at room temperature, using cupric sulfate and sodium sulfide aqueous solutions as precursors. The structural, surface morphological, optical, and electrical properties of the as-deposited film were investigated via X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, optical absorption, and d.c. 2-point probe methods. The film was found to be amorphous, dense, and uniform. Average atomic percentage of Cu:S in the as-deposited film was calculated as 63:37. The band gap energy of copper sulfide thin film was found to be 2.14 eV …
Neutron-Rich ^{208}Pb Nucleus With Delta Excitation Under Compression, Mohammed Hassen Eid Abu-Sei'leek
Neutron-Rich ^{208}Pb Nucleus With Delta Excitation Under Compression, Mohammed Hassen Eid Abu-Sei'leek
Turkish Journal of Physics
The spherical Hartree-Fock approximation is applied to a no-core shell model with a realistic effective baryon-baryon interaction. The ground state properties of a heavy spherical neutron-rich doubly magic ^{208}Pb nucleus under compression are investigated. It is found that the nucleus becomes more bound with the occurrence of Delta resonances. The creation of Delta increases as the compression is continuous. There is a considerable reduction in the compressibility when the Delta degree of freedom is activated. It is found that the Delta particle is the basic component of the ^{208}Pb nucleus besides nucleons at the ground state without any compression. When …
Uv-Vis And Xrd Investigation Of Graphite-Doped Poly(Acrylic) Acid Membranes, Mihai Todica, Traian Stefan, Simion Simon, Istvan Balasz, Liviu Daraban
Uv-Vis And Xrd Investigation Of Graphite-Doped Poly(Acrylic) Acid Membranes, Mihai Todica, Traian Stefan, Simion Simon, Istvan Balasz, Liviu Daraban
Turkish Journal of Physics
Possible modification of the structure of poly(acrylic) acid (PAA) membranes doped with graphite was investigated by UV-Vis and XRD techniques. The pure PAA membranes were characterized by good transparency in the domain 250-700 nm, with maximum absorption at 207 nm. The absorbance of membranes increased significantly after doping with graphite. The XRD patterns of pure membranes showed a low degree of order of the polymeric matrix. Some modifications of the parameters of the ordered domains of the polymer and of the graphite appeared at high concentrations of the dopant.
Saga Of Efficiency Degradation At High Injection In Ingan Light Emitting Diodes, Vitaliy Avrutin, Shopan A. Hafiz, Fan Zhang, Ümi̇t Özgür, Enrico Bellotti, Francesco Bertazzi, Michele Goano, Arvydas Matulionis, Adam T. Roberts, Henry O. Everitt, Hadis Morkoç
Saga Of Efficiency Degradation At High Injection In Ingan Light Emitting Diodes, Vitaliy Avrutin, Shopan A. Hafiz, Fan Zhang, Ümi̇t Özgür, Enrico Bellotti, Francesco Bertazzi, Michele Goano, Arvydas Matulionis, Adam T. Roberts, Henry O. Everitt, Hadis Morkoç
Turkish Journal of Physics
No abstract provided.
Morphology And Crystallinity Control Of Wet Chemically Grown Zno Nanorods, Janos Volk, Róbert Erdélyi
Morphology And Crystallinity Control Of Wet Chemically Grown Zno Nanorods, Janos Volk, Róbert Erdélyi
Turkish Journal of Physics
The controlled growth of ZnO nanorods on technologically relevant substrates is essential for their practical integration into next generation optoelectronic and piezoelectric devices. In this report, highly ordered and uniform vertical ZnO nanorod arrays were synthesized using a facile, low temperature selective area wet chemical growth process. The nanorods were grown through nucleation windows that were patterned in a PMMA mask using electron beam lithography. At first, the technique was demonstrated on `ideal' ZnO single crystal substrates, where the geometrical parameters of the highly uniform and crystallographically coherent nanorods were dictated by the nucleation pattern, the polarity of the substrate, …