Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Turkey (105)
- 1 (99)
- 2 (82)
- Classification (70)
- Optimization (65)
-
- Deep learning (61)
- Genetic algorithm (61)
- Machine learning (61)
- Synthesis (61)
- Adsorption (53)
- Particle swarm optimization (51)
- Antimicrobial activity (47)
- Geochemistry (47)
- 3 (44)
- Stability (39)
- Artificial neural network (37)
- Phthalocyanine (35)
- Support vector machine (34)
- Feature extraction (32)
- Wireless sensor networks (31)
- Antibacterial activity (29)
- Artificial neural networks (28)
- Feature selection (28)
- Copper (27)
- Cytotoxicity (27)
- Power quality (27)
- Fuzzy logic (26)
- Molecular docking (26)
- Palladium (26)
- Preconcentration (26)
- Publication Year
Articles 7891 - 7920 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Synthesis And Characterization Of 4-(Alkylaminoisonitrosoacetyl)Diphenyl Ether And Some Of Their Metal Complexes, Ahmet Coşkun, Funda Yilmaz
Synthesis And Characterization Of 4-(Alkylaminoisonitrosoacetyl)Diphenyl Ether And Some Of Their Metal Complexes, Ahmet Coşkun, Funda Yilmaz
Turkish Journal of Chemistry
4-(Chloroacetyl)diphenyl ether (I) was synthesized from chloroacetyl chloride and diphenyl ether in the presence of AlCl_3 as catalyst in a Friedel-Crafts reaction. Subsequently, its keto oxime (II) derivative was prepared. Then 3 new substituted 4-(alkylaminoisonitrosoacetyl)diphenyl ether ligands derived from 4-(phenoxy)phenyloxylohydroxymoyl chloride and corresponding amines were synthesized. The following aromatic and aliphatic amines were used for the ligands ethanolamine, 2-amino-4-methylphenol, and 2-(aminomethyl) pyridine. Mononuclear or binuclear Co(II), Ni(II), Cu(II), and Cd(II) complexes of the ligands were synthesized. The structures of these ligands were identified by FT-IR, ^1H-NMR, and ^{13}C-NMR spectral data and elemental analysis, and the structures of the complexes were …
One-Step Synthesis Of Hyaluronic Acid-Based (Sub)Micron Hydrogel Particles: Process Optimization And Preliminary Characterization, Nurettin Sahiner, Xinqiao Jia
One-Step Synthesis Of Hyaluronic Acid-Based (Sub)Micron Hydrogel Particles: Process Optimization And Preliminary Characterization, Nurettin Sahiner, Xinqiao Jia
Turkish Journal of Chemistry
Hyaluronic acid (HA)-based (sub)micron hydrogel particles were synthesized by crosslinking virgin HA with divinyl sulfone (DVS) in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelle systems under basic conditions. Experimental parameters including HA molecular weight, solution concentration, and reaction time were systematically varied in order to obtain well defined hydrogel particles. The use of a cosurfactant, 1-heptanol (1-HP), had a profound effect on the reaction kinetics and the particle morphology. The resulting particles exhibit negative charges on their surfaces. In vitro biocompatibility study indicates that these particles do not cause severe death to the cultured fibroblasts. These HA-based hydrogel particles are promising candidates …
Biologically Active Transition Metal Chelates With A 2-Thiophenecarboxaldehyde-Derived Schiff Base: Synthesis, Characterization, And Antibacterial Properties, Cezar Spinu, Maria Pleniceanu, Cristian Tigae
Biologically Active Transition Metal Chelates With A 2-Thiophenecarboxaldehyde-Derived Schiff Base: Synthesis, Characterization, And Antibacterial Properties, Cezar Spinu, Maria Pleniceanu, Cristian Tigae
Turkish Journal of Chemistry
Metal complexes, ML_2Cl_2, where M is Fe(II), Co(II), Ni(II), Cu(II), Zn(II), or Cd(II), and L is the Schiff base formed by condensation of 2-thiophenecarboxaldehyde with 2-aminopyridine, N-(2-thienylmethylidene)-2-aminopyridine (TNAPY) have been prepared and characterized by elemental analysis, and magnetic and spectroscopic measurements. Elemental analysis of the chelates suggests the stoichiometry is 1:2 (metal-ligand). Infrared and NMR spectra of the complexes agree with the coordination to the central metal atom through the nitrogen of the azomethine (-HC=N-) group and the sulfur atom of the thiophene ring. Magnetic susceptibility data coupled with electronic and ESR spectra suggest a distorted octahedral structure for the …
The Kinetics And Mechanism Of Ruthenium(Iii)-Catalyzed Oxidation Of Tris(2-Amino Ethyl)Amine By Hexacyanoferrate(Iii) In Aqueous Alkaline Medium, Radhey Mohan Naik, Abhishek Srivastava, Amit Kumar Verma
The Kinetics And Mechanism Of Ruthenium(Iii)-Catalyzed Oxidation Of Tris(2-Amino Ethyl)Amine By Hexacyanoferrate(Iii) In Aqueous Alkaline Medium, Radhey Mohan Naik, Abhishek Srivastava, Amit Kumar Verma
Turkish Journal of Chemistry
The kinetics of ruthenium(III)-catalyzed oxidation of TREN, i.e. tris(2-amino ethyl)amine(3-hydrochloride) by an outer sphere electron transfer oxidant, potassium hexacyanoferrate(III), was investigated spectrophotometrically in aqueous alkaline medium. The extent of the reaction was followed by registering a decrease in absorbance at 420 nm (\lambda_{max} of Fe(CN)_6^{3-}) due to its consumption as a function of [OH^-], ionic strength, [Fe(CN)_6^{3-}], [TREN], and temperature by varying only one variable at a time and keeping all other variables constant. The rate data indicate that the reaction exhibited first order dependence in [oxidant] and at a lower concentrations of reductant. The overall reaction follows second order …
Novel Analogues Of 2-Pyrazoline: Synthesis, Characterization, And Antimycobacterial Evaluation, Ahmet Özdemi̇r, Gülhan Turan Zitouni, Zafer Asim Kaplancikli
Novel Analogues Of 2-Pyrazoline: Synthesis, Characterization, And Antimycobacterial Evaluation, Ahmet Özdemi̇r, Gülhan Turan Zitouni, Zafer Asim Kaplancikli
Turkish Journal of Chemistry
Fourteen new 1-[(N,N-disubstitutedthiocarbamoylthio)acetyl]- 3-(2-thienyl)-5-aryl-2-pyrazoline derivatives were synthesized by reacting 1-(chloroacetyl)-3-(2-thienyl)-5-aryl-2-pyrazolines and appropriate sodium salts of N,N-disubstituted dithiocarbamoic acids in acetone. The structures of the synthesized compounds were confirmed by UV, IR, ^1H-NMR, and FAB^+-MS spectral data. The compounds were evaluated for in vitro antimycobacterial activity against Mycobacterium tuberculosis H37Rv using the BACTEC 460 radiometric system and BACTEC 12B medium. The preliminary results showed that all of the tested compounds were inactive against the test organism.
Synthesis And Antifungal Activity Of Some Novel N-(4-Phenyl-3-Aroylthiazol-2(3h)-Ylidene) Substituted Benzamides, Aamer Saeed, Sabah Zaman, Maryam Jamil, Bushra Mirza
Synthesis And Antifungal Activity Of Some Novel N-(4-Phenyl-3-Aroylthiazol-2(3h)-Ylidene) Substituted Benzamides, Aamer Saeed, Sabah Zaman, Maryam Jamil, Bushra Mirza
Turkish Journal of Chemistry
Variously substituted N-(4-phenyl-3-aroylthiazol-2(3H)-ylidene)benzamides (2a-t) were prepared by base-catalyzed cyclization of corresponding 1-aroyl-3-aryl thioureas with acetophenone in the presence of bromine. Some of the synthesized compounds were assayed in vitro for their antifungal activity and were found to exhibit low to moderate activity.
Hydrogenation Of Citral Over Pt And Pt-Sn Catalysts, Hi̇lal Aykaç, Selahatti̇n Yilmaz
Hydrogenation Of Citral Over Pt And Pt-Sn Catalysts, Hi̇lal Aykaç, Selahatti̇n Yilmaz
Turkish Journal of Chemistry
Hydrogenation of citral on monometallic (Pt) and bimetallic (Pt-Sn) catalysts was investigated. It was found that the catalyst activities and product distributions were different over Na-Y and Clino supports. Among monometallic catalysts, Pt/Na-Y was more selective to citronellol (3.9%) and unsaturated alcohols, geraniol and nerol, (14.1%). Sn addition increased the catalyst activities. However, its effect on product distribution differed. Yield of geraniol+nerol changed from 5.1% to 19.7% over Clino. However, selectivity to unsaturated alcohols over Na-Y decreased when it was prepared as a bimetallic catalyst support. Unsaturated alcohol formation was favored when there was a metal support interaction over monometallic …
New Flame-Retardant Poly(Ester-Imide)S Containing Phosphine Oxide Moieties In The Main Chain: Synthesis And Properties, Khalil Faghihi
New Flame-Retardant Poly(Ester-Imide)S Containing Phosphine Oxide Moieties In The Main Chain: Synthesis And Properties, Khalil Faghihi
Turkish Journal of Chemistry
Six new flame-retardant poly(ester-imide)s (9a-f) with high inherent viscosity and containing phosphine oxide moieties in the main chain were synthesized from the polycondensation reaction of N,N-(3,3-diphenylphenyl phosphine oxide) bistrimellitimide diacid chloride (7) with 6 aromatic diols (8a-f) by 2 different methods:--solution and microwave-assisted polycondensation. The results showed that compared to solution polycondensation, the microwave-assisted polycondensation reaction using a domestic microwave oven proceeded rapidly and was completed within about 9-12 min. All of the obtained polymers were fully characterized by means of elemental analysis, viscosity measurement, solubility testing, and FT-IR spectroscopy. Thermal properties and flame retardant behavior of the PEIs (9a-f) …
Synthesis And Characterization Of New Tridentate Iminooxime Ligands And Their Co(Iii) Complexes, Hasene Mutlu, Gazi̇ İrez
Synthesis And Characterization Of New Tridentate Iminooxime Ligands And Their Co(Iii) Complexes, Hasene Mutlu, Gazi̇ İrez
Turkish Journal of Chemistry
In this study, (hydroxyimino)(2-phenyl(1,2,3,4-tetrahydroquinazolin- 2-yl))methane (H_2L^1) and (hydroxyimino)(2-(2-thienyl)(1,2,3,4- tetrahydroquinazolin-2-yl))methane (H_2L^2) were synthesized by the condensation of 2-(hydroxyimino)-1-phenylethan-1-one (INAP) and 2-(hydroxyimino)-1-(2-thienyl)ethan-1-one (INAT) with 2-aminobenzylamine (2-ABA). Complexes of these ligands with Co^{3+} were prepared with a metal:ligand ratio of 1:2. The ligands and their complexes were elucidated on the basis of elemental analyses, AAS, FT-IR, ^1H- and ^{13}C-NMR spectra, mass spectra, magnetic susceptibility measurements, and molar conductivity.
Comparison Of Catalytic Activities Of Carbon Supported Pt And Pt-Ru Catalysts For Methanol Oxidation In Neutral And Basic Media By Cyclic Voltammetry, Abdul Sattar Ali Khan, Riaz Ahmed, Muhammad Latif Mirza
Comparison Of Catalytic Activities Of Carbon Supported Pt And Pt-Ru Catalysts For Methanol Oxidation In Neutral And Basic Media By Cyclic Voltammetry, Abdul Sattar Ali Khan, Riaz Ahmed, Muhammad Latif Mirza
Turkish Journal of Chemistry
The catalytic activities of an equal amount of 3 different carbon supported catalysts containing 10% Pt, 20% Pt + 10% Ru, and 30% Pt were evaluated in neutral and basic media for methanol oxidation by cyclic voltammetry. The prominent oxidation peak for methanol appeared in the forward anodic sweep at around 1.0 V in neutral medium, while in basic medium it appeared at significantly lower potential close to 0.2 V. The peak current for methanol oxidation was higher on a catalyst containing higher Pt loading. The comparison of polarization behavior of 20% Pt + 10% Ru and 30% Pt catalysts …
Synthesis And Biological Activity Of Allosteric Modulators Of Gaba_B Receptors. Part 4. Synthesis Of Potentially Fluorescent Acridines And Conformationally Restricted N-(Arylpropyl)-1-Arylethylamines, Jabbar Khalafy, Rolf H. Prager, Ni Made Puspawati
Synthesis And Biological Activity Of Allosteric Modulators Of Gaba_B Receptors. Part 4. Synthesis Of Potentially Fluorescent Acridines And Conformationally Restricted N-(Arylpropyl)-1-Arylethylamines, Jabbar Khalafy, Rolf H. Prager, Ni Made Puspawati
Turkish Journal of Chemistry
A series of 8 new derivatives of fendiline was prepared for evaluation as allosteric modulators of GABA_B receptors: 4 based on acridine and 4 with restricted distance between the 2 aryl moieties.
Magma Interaction Processes Inferred From Fe-Ti Oxide Compositions In The Dölek And Sarıçiçek Plutons, Eastern Turkey, Orhan Karsli, Faruk Aydin, İbrahi̇m Uysal, M. Burhan Sadiklar
Magma Interaction Processes Inferred From Fe-Ti Oxide Compositions In The Dölek And Sarıçiçek Plutons, Eastern Turkey, Orhan Karsli, Faruk Aydin, İbrahi̇m Uysal, M. Burhan Sadiklar
Turkish Journal of Earth Sciences
Magnetite-ulvöspinel and ilmenite-hematite solid solution intergrowths from the high-K calc-alkaline Dölek and Sarıçiçek plutons, Eastern Turkey, were investigated using microprobe analyses. Compositions of twenty-eight samples from the host rocks and their enclaves in the plutons were used to estimate the oxygen fugacity and temperature. The ilmenite and ulvöspinel component exsolves out along certain preferred crystallographic planes in the titanomagnetite of the host rocks, while they are always absent in those of the mafic microgranular enclaves. The titanomagnetite and ilmenite show variations as Mt_{98-70}Usp_{02-30} and Ilm_{99-65}Hm_{01-35} in composition, respectively. Estimations of oxygen fugacity and temperature using the titanomagnetite-ilmenite thermometry/oxygen barometry range …
Structural And Elastic Properties Of Mgx (X=Se, Te) Semi Conducting Compounds Under High Pressure, Purvee Bhardwaj, Sadhna Singh, Neeraj Kumar Gaur
Structural And Elastic Properties Of Mgx (X=Se, Te) Semi Conducting Compounds Under High Pressure, Purvee Bhardwaj, Sadhna Singh, Neeraj Kumar Gaur
Turkish Journal of Physics
In the present paper, we have investigated the high-pressure structural phase transition of magnesium chalcogenides using the three-body potential (TBP) model. Phase transition pressures are associated with a sudden collapse in volume. The phase transition pressures and associated volume collapses obtained from TBP are in reasonably good agreement with experimental data. In addition, the elastic constants and their combinations with pressure are also reported. It is found that TBP has promise to predict phase transition pressure, elastic constants, and their pressure derivatives for other chalcogenides as well.
Ac Conductivity And Ultrasonic Studies In Khco_3 Compound, Fathy Salman, Sayed Abouelhassan, Eslam Sheha, Mabrouk Elmansy
Ac Conductivity And Ultrasonic Studies In Khco_3 Compound, Fathy Salman, Sayed Abouelhassan, Eslam Sheha, Mabrouk Elmansy
Turkish Journal of Physics
The total conductivity of KHCO_3 compound is studied in the frequency range 50 Hz-1 MHz and in the temperature range 300-370 K. The conductivity frequency dependence relation is divided into three regions: one at low frequency (dc conductivity), while the others appear at a moderate and relatively higher frequency range. In general, the conductivity frequency dependence conductivity obeys a double power law relation, \sigma_{tot} = \sigma_{dc} + A\omega^p + B\omega^q. The powers p and q have been found to be in the range 0 to 1 and 1 to 2, respectively. The attenuation coefficient \beta of KHCO_3 compound was studied …
Some Characterizations Of Rectifying Curves In The Euclidean Space E^4, Kazim İlarslan, Emilija Nesovic
Some Characterizations Of Rectifying Curves In The Euclidean Space E^4, Kazim İlarslan, Emilija Nesovic
Turkish Journal of Mathematics
In this paper, we define a rectifying curve in the Euclidean 4-space as a curve whose position vector always lies in orthogonal complement N^{\perp} of its principal normal vector field N. In particular, we study the rectifying curves in E^4 and characterize such curves in terms of their curvature functions.
Cr-Submanifolds Of An S-Manifold, A. Alghanemi
Cr-Submanifolds Of An S-Manifold, A. Alghanemi
Turkish Journal of Mathematics
The study of CR-submanifolds of a Kaehler manifold was initiated by Bejancu [1]. Since then many papers have appeared on CR-submanifolds. The purpose of this paper is to studied the CR-submanifolds of an S-manifold. In particular, we studied the integrability of the distributions D and D^{\bot} of a CR-submanifold of an S-manifold.
Metric Trees, Hyperconvex Hulls And Extensions, Asuman G. Aksoy, B. Maurizi
Metric Trees, Hyperconvex Hulls And Extensions, Asuman G. Aksoy, B. Maurizi
Turkish Journal of Mathematics
In this paper we examine the relationship between hyperconvex hulls and metric trees. After providing a linking construction for hyperconvex spaces, we show that the four-point property is inherited by the hyperconvex hull, which leads to the theorem that every complete metric tree is hyperconvex. We also consider some extension theorems for these spaces.
Effects Of Opacity On Stellar Radii And Their Relevance To Observational Data, Gülay İnlek, Aysun Böke, Oktay Yilmaz, Edwin Budding
Effects Of Opacity On Stellar Radii And Their Relevance To Observational Data, Gülay İnlek, Aysun Böke, Oktay Yilmaz, Edwin Budding
Turkish Journal of Physics
We have examined the effect of varying opacities on envelope structure with the aid of Paczynski's public domain stellar modelling programs. For this, we prepared new opacity tables from the data of Kurucz [1], using Lagrange interpolation to obtain the tabular values. We compare the results of these Kurucz opacities with similar tabulations from Huebner et al. [2], Iglesias and Rogers [3], Rogers and Iglesias [4] and Iglesias and Rogers [5]. We have checked calculations for the same ranges of stars considered originally by Schwarzschild [6], and compared our findings, using newer opacity data, with those of other sources. We …
The Energy Spectrum Of Two-Electron Semiconductor Quantum Dots, Mohammad K. Elsaid
The Energy Spectrum Of Two-Electron Semiconductor Quantum Dots, Mohammad K. Elsaid
Turkish Journal of Physics
The ground-state properties of a two-dimensional quantum-dot are studied. We have used the shifted 1/N expansion method to solve the relative part Hamiltonian of two electrons confined in a quantum in the presence of an applied uniform magnetic field. The spin singlet-triplet transition in the ground state of the QD is shown. We have also displayed the singlet-triplet energy gap, J = \Delta = E_T - E_S, against the strength of the magnetic field for two electron quantum dot. Based on comparisons, the eigenenergies obtained by the shifted method are in excellent agreement with exact, variational, Hartree-Fock (HF) and Full-Configuration …
Photoelectrochemical Investigations On Hg_Xcd_{1-X}Se Thin Film Electrode/Electrolyte System, Vithal Bhivaba Pujari, L. P. Deshmukh
Photoelectrochemical Investigations On Hg_Xcd_{1-X}Se Thin Film Electrode/Electrolyte System, Vithal Bhivaba Pujari, L. P. Deshmukh
Turkish Journal of Physics
Thin film electrodes of Hg_xCd_{1-x}Se (0 \le x \le 0.2) were prepared in an aqueous alkaline medium (pH \cong 11) on highly conducting stainless steel substrates by chemical bath technique. Use of these films was made as an active photoelectrode in an electrochemical photovoltaic cell, comprising: electrode; sodium polysulphide electrolyte; and impregnated graphite as a counter electrode. The investigations on these cells were made by studying I-V and C-V characteristics in dark, power output, built-in-potential, spectral and photo responses. Cell performance parameters were evaluated: open-circuit photopotential V_{ph}; and short-circuit photocurrent I_{ph}; series and shunt resistances R_{s} and R_{sh}; quantum conversion …
Two-To-Four Coherent Beams Interference Patterns Of Non-Orthogonal Planes, Ali̇ekber Aktağ
Two-To-Four Coherent Beams Interference Patterns Of Non-Orthogonal Planes, Ali̇ekber Aktağ
Turkish Journal of Physics
In this paper, we present an analysis of intensity distribution of interference pattern of two-to-four linearly polarized plane waves at their intersection in a plane surface. A configuration in which the four plane waves intersect at different angles along four non-orthogonal planes is considered. We show that the shape and the intensity distribution of the interference pattern is strong function of the angles of planes, kinds of polarizations, beam incidence angles. A variety of two-dimensional intensity distribution arrays have been formed by two-to-four beams with differing plane angles, angles of beam incidence and beam polarizations, which may potentially be useful …
Heat Capacity Anomalies Of Tlins_2 And Tlgas_2 Single Crystals Detected By Differential Scanning Calorimetry (Dsc), Muhammed Açikgöz
Heat Capacity Anomalies Of Tlins_2 And Tlgas_2 Single Crystals Detected By Differential Scanning Calorimetry (Dsc), Muhammed Açikgöz
Turkish Journal of Physics
Specific heat capacity C_p anomalies of layered single crystals TlInS_2 and TlGaS_2 have been investigated using differential scanning calorimetry (DSC) as a new technique for such crystals. Special features of C_p have been revealed in the temperature range of the possible phase transitions of both crystals. A sequence of maximum values of C_p is obtained at 163, 174, 184, 193, 201, 212, 224, 254, and 259 K for TlInS_2. In the case of TlGaS_2, the temperatures of the obtained maximum C_p values at 177 and 241 K agree well with the intervals of the phase transition temperatures reported in the …
Electronic And Structural Properties Of Zincblende B_Xga_{1-X}N, Abdelhadi Lachebi, Hamza Abid
Electronic And Structural Properties Of Zincblende B_Xga_{1-X}N, Abdelhadi Lachebi, Hamza Abid
Turkish Journal of Physics
We present structural and electronic properties of the cubic structure for different concentrations x of ternary alloy B_xGa_{1-x}N. The computational method is based on the full-potential linearised augmented plane wave method (FP-LAPW). The exchange and correlation energy is described in the local density approximation (LDA) and generalized gradient approximation (GGA). We have investigated the effect of composition on the ground state properties, lattice parameters, bulk modulus, pressure derivative and band gap of the zinc blend BN and GaN. The results obtained are in a good agreement with experimental and theoretical values concerning the variation of the gaps and crossover direct, …
Emc Effect Using Thermodynamical Bag Model, Kuppusamy Ganesamurthy, Raghavan Sambasivam
Emc Effect Using Thermodynamical Bag Model, Kuppusamy Ganesamurthy, Raghavan Sambasivam
Turkish Journal of Physics
The nuclear EMC effect has been evaluated in the entire range of Bjorken variable x for the value of Q^2 = 5 GeV^2 using the phenomenological model known as the Thermodynamical bag model (TBM) and the results have been compared with the experimental values obtained in the deep inelastic scattering by SLAC and BCDMS. Also the values of structure function ratio are obtained as a function of Nachtmann variable \xi , which is used to represent the quark momentum in the Bjorken limit.
Superconducting State Parameters Of Be-Zr Glassy Alloys, Aditya M. Vora
Superconducting State Parameters Of Be-Zr Glassy Alloys, Aditya M. Vora
Turkish Journal of Physics
The theoretical investigation of the superconducting state parameters (SSP) viz. electron-phonon coupling strength \lambda , Coulomb pseudopotential \mu*, transition temperature T_C , isotope effect exponent \alpha and effective interaction strength N_O V of Be_c Zr_{1-c} (c= 0.30, 0.35, 0.40 and 0.45) metallic glasses have been reported using Ashcroft's empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. It is observed that the electron-phonon …
Some Bulk Viscous String Cosmological Models, Ganeshwar Mohanty, Gauranga Charana Samanta
Some Bulk Viscous String Cosmological Models, Ganeshwar Mohanty, Gauranga Charana Samanta
Turkish Journal of Physics
Five dimensional String cosmological models in the presence of variable bulk viscous coefficient, constant bulk viscous coefficient and in the absence of bulk viscosity are constructed and some physical and kinematical behaviors of these models are discussed.
Path Integral Quantization Of Spinning Superparticle, Hanaa A. Elegla, N. I. Farahat
Path Integral Quantization Of Spinning Superparticle, Hanaa A. Elegla, N. I. Farahat
Turkish Journal of Physics
The Hamilton-Jacobi formalism is used to discuss the path integral quantization of a spinning superparticle model. The equations of motion are obtained as total differential equations in many variables. The equations of motion are integrable, and the path integral is obtained as an integration over the canonical phase space coordinates.
Dielectric Dispersion In Pbo-Bi_2o_3-B_2o_3 Glasses Mixed With Tio_2, P. Venkateswara Rao, M. Srinivasa Reddy, Vandana Ravi Kumar, Y. Gandhi, Nalluri Veeraiah
Dielectric Dispersion In Pbo-Bi_2o_3-B_2o_3 Glasses Mixed With Tio_2, P. Venkateswara Rao, M. Srinivasa Reddy, Vandana Ravi Kumar, Y. Gandhi, Nalluri Veeraiah
Turkish Journal of Physics
[(PbO)_{0.20-x} . (Bi_2O_3)_{0.40} . (B_2O_3)_{0.40}]: (TiO_2)_x, 0.0 =< x =< 0.02 glasses were prepared. Dielectric properties (dielectric constant \varepsilon \prime, loss tan \delta and a.c. conductivity \sigma_{ac}, over a wide range of frequency and temperature), optical absorption, ESR and IR spectra of these glass materials have been investigated. The dielectric study has revealed that the glasses possess high insulating strength when TiO_2 concentration is >0.8 mol% in the glass matrix. The optical absorption spectra of these glasses exhibited bands due to Ti^{3+} ions in the visible region. ESR spectral studies have also indicated that a fraction of Ti^{4+} ions reduced to Ti^{3+} ions. IR spectra of these glasses exhibited bands due to TiO_4 and TiO_6 structural units. Quantitative studies indicate that as concentration of TiO_2 is increased to 0.8 mol% in the glass matrix, a large proportion of titanium ions exist in Ti^{3+} state and has influenced the physical properties of these glasses to a substantial …
Static Plane Symmetric Zeldovich Fluid Model In Scale Invariant Theory, Bivudutta Mishra
Static Plane Symmetric Zeldovich Fluid Model In Scale Invariant Theory, Bivudutta Mishra
Turkish Journal of Physics
Field equations in the presence of a perfect fluid distribution for static plane symmetric metric are obtained in the scale invariant theory of gravitation proposed by Wesson [1]. A static Zeldovich fluid model corresponding to perfect fluid is presented. Physical and kinematical properties of the model are discussed.
Trace Classes And Fixed Points For The Extended Modular Group \Overline{\Gamma}, Özden Koruoğlu, Recep Şahi̇n, Sebahatti̇n İki̇kardeş
Trace Classes And Fixed Points For The Extended Modular Group \Overline{\Gamma}, Özden Koruoğlu, Recep Şahi̇n, Sebahatti̇n İki̇kardeş
Turkish Journal of Mathematics
The extended modular group \overline{\Gamma}=PGL(2,\mathbb{Z}) is the group obtained by adding the reflection R(z)=1/\overline{z} to the generators of the modular group \Gamma =PSL(2, {Z}). In this paper, we find the trace classes of the extended modular group \overline{\Gamma}. Using this, we classify the elements of \overline{\Gamma}.