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Full-Text Articles in Physical Sciences and Mathematics

Slab Waveguide Sensor Based On Amplified Phase Change Due To Multiple Total Internal Reflections, Sofyan A. Taya, Taher M. El-Agez Jan 2012

Slab Waveguide Sensor Based On Amplified Phase Change Due To Multiple Total Internal Reflections, Sofyan A. Taya, Taher M. El-Agez

Turkish Journal of Physics

We present theoretically an optical slab waveguide sensor based on amplified phase change due to multiple total internal reflections (TIRs). Compared with the conventional waveguide sensors, the proposed approach provides higher sensitivity. In this sensor, we adopt the change in the ellipsometric total phase change \Delta as the measuring probe of changes in the refractive index (RI) of the cladding. The change in \Delta is calculated for large number of alternating total reflections. Numerical calculations show that \Delta is strongly dependent on the RI variations of the cladding. Moreover, theoretical simulations show that the resolution of this sensor is predicted …


Morphological And Optical Properties Of Vacuum Evaporated Zno Thin Films, Farzana Chowdhury, S. M. Firoz Hasan, M. Sahabul Alam Jan 2012

Morphological And Optical Properties Of Vacuum Evaporated Zno Thin Films, Farzana Chowdhury, S. M. Firoz Hasan, M. Sahabul Alam

Turkish Journal of Physics

ZnO thin films were deposited onto chemically and ultrasonically cleaned glass substrates by thermal evaporation in vacuum (\sim 10^{-6} mbar). The thickness of the films was measured by frequency shift of quartz crystal. The optical properties of the films have been ascertained by UV-VIS-NIR spectrophotometry in the photon wavelength range of 300--2500 nm. The effect of substrate temperature on the optical properties of the films has been investigated, where all film thickness was kept fixed at 100 \pm 10 nm. The optical transmittance spectra reveal a maximum transmittance of 88% at room temperature around photon wavelength of 2350 nm. Band …


Structural And Optical Studies On La Doped Cds Nanocrystalline Films, Kusumanjali Dehmukh, Mimi Mukherjee, Shashi Bhushan Jan 2012

Structural And Optical Studies On La Doped Cds Nanocrystalline Films, Kusumanjali Dehmukh, Mimi Mukherjee, Shashi Bhushan

Turkish Journal of Physics

This paper reports the synthesis of pure and lanthanum (La) doped nanocrystalline CdS semiconducting films on the glass substrate by means of chemical bath deposition (CBD), with Cd(CH_3COO)_2 as Cadmium (Cd) ion source, (NH_2)_2CS as sulphur (S) ion source and Thioglycerol as capping agent. Long, rod like structures is observed in SEM micrographs of the films. XRD studies show the existence of both hexagonal and cubic phases. Increase in FWHM is observed for smaller particle due to nanocrystalline effect. UV-VIS absorption studies show shift of absorption edge towards lower wavelength side. Corresponding change in band gap energy results in shift …


The Composition Dependence Of The Optical Band Gap In Ge Doped Se-Te Glassy Alloy, Mainika Kapoor, Nagesh Thakur Jan 2012

The Composition Dependence Of The Optical Band Gap In Ge Doped Se-Te Glassy Alloy, Mainika Kapoor, Nagesh Thakur

Turkish Journal of Physics

Bulk glasses with the chemical composition (Se_{80}Te_{20})_{100-x}Ge_x (x = 0, 2, 4, 6) have been prepared from high purity constituent elements. Fragments of the bulk glasses are used to deposit thin films by vacuum thermal evaporation and compositional dependence of the optical and physical properties have been studied. It has been found that optical absorption is due to indirect transition and the optical band gap E_g increases with increasing Ge content in Se-Te glassy alloy. The relationship between the E_g and chemical composition is discussed in terms of cohesive energy and co-ordination number.


Specific Heat Of Ytterbium Iron Garnet Yb_3fe_5o_{12} At Low Temperatures, Abdelmalek Boumali, Oumhani Derar Jan 2012

Specific Heat Of Ytterbium Iron Garnet Yb_3fe_5o_{12} At Low Temperatures, Abdelmalek Boumali, Oumhani Derar

Turkish Journal of Physics

The state of the Yb^{3+} ion of the ytterbium iron garnet (Yb_3Fe_5O_{12}) is suitable for the development of theoretical models with rather good approximations. Using the theory of two-level paramagnetic ions, the total and magnetic specific heat at low temperatures has been calculated. The influence of tensors g and G on the specific heat of YbIG has been examined. A comparison has been made of our results and those obtained with a model based on of the approximation of Weiss Molecular-Field (WMF) and experimental data.


Characterization Of Analog Modulation Of Algaas Lasers And The Induced Intensity Noise, Moustafa Ahmed, Nour Zaki El-Sayed, Hameeda Ibrahim, Kamal Abdelhady Jan 2012

Characterization Of Analog Modulation Of Algaas Lasers And The Induced Intensity Noise, Moustafa Ahmed, Nour Zaki El-Sayed, Hameeda Ibrahim, Kamal Abdelhady

Turkish Journal of Physics

The dynamics of AlGaAs laser diodes under analog intensity modulation are characterized and the associated intensity noise is evaluated. The study is based on numerical solution of the stochastic rate equations of semiconductor lasers. Based on the shape of the modulated laser signal, the modulation dynamics are classified into eight distinct types. Four types are characterized by continuous periodic signals, and three types have periodic pulsing signals. These signals happen to have period doubling or superposed by sub-peaks from the relaxation oscillations of the laser. The last type is chaos, in which the signal is irregular and non-uniform. The noise …


Equations Of State For Amorphous And Crystalline Nickel By Means Of Molecular Dynamics Method, Soner Özgen, Levent Sonğur, İzzet Kara Jan 2012

Equations Of State For Amorphous And Crystalline Nickel By Means Of Molecular Dynamics Method, Soner Özgen, Levent Sonğur, İzzet Kara

Turkish Journal of Physics

There are few theoretical studies on the equation of state (EOS) for amorphous materials while much work has been carried out for crystalline systems. In this study, the EOSs for both crystal- and amorphous-structured nickel are obtained by using an anisotropic molecular dynamics method based on the Voter-Chen formalism of embedded atom method. In order to achieve the EOSs, polynomial curve fitting method has been applied to the data obtained from molecular dynamics simulations carried assuming isothermal and isobaric conditions. Isothermal bulk modulus and their pressure derivatives for both amorphous and crystal structures have also been calculated. The results are …


Monochromatization Effect Kinetic Model For Penning Gas Mixtures Emission Mechanisms, Catalina Ciobotaru, Geavit Musa Jan 2012

Monochromatization Effect Kinetic Model For Penning Gas Mixtures Emission Mechanisms, Catalina Ciobotaru, Geavit Musa

Turkish Journal of Physics

The monochromatization effect (M-effect), which consists in the reduction of an electronegative-electropositive gas mixtures discharge emission spectrum to only a few or a single line, was largely explained in our previous published papers together with their generation mechanisms, namely the polar ion-ion recombination and the energy resonance condition. This paper presents a kinetic model for the M-effect based on the radiative and collisional processes which appear between 1s_2, 1s_3, 1s_4 and 1s_5 Paschen levels, in Penning gas mixtures, where this effect was observed to be the most powerful.


The Differential Transform Method For Solving Heat-Like And Wave-Like Equations With Variable Coefficients, Khatereh Tabatabaei, Ercan Çeli̇k, Raziyeh Tabatabaei Jan 2012

The Differential Transform Method For Solving Heat-Like And Wave-Like Equations With Variable Coefficients, Khatereh Tabatabaei, Ercan Çeli̇k, Raziyeh Tabatabaei

Turkish Journal of Physics

In this article, Differential transform method is presented for solving heat-like and wave-like equations with variable coefficients. We applied these methods to six examples. This powerful method gives an exact solution. These examples are prepared to show the efficiency and simplicity of the method.


Coupled-Channels Analysis Of K^+ Scattering From ^6li, Ahmed Aly Ebrahim Jan 2012

Coupled-Channels Analysis Of K^+ Scattering From ^6li, Ahmed Aly Ebrahim

Turkish Journal of Physics

Differential cross sections for the elastic and inelastic scattering of K^+ at 715 MeV/c from ^6Li are analysed by applying the Watanabe superposition model to the real potential with a phenomenological imaginary potential. The optical potential of ^6Li is calculated in terms of alpha-particle and deuteron or triton and helion optical potentials. The calculated cross sections are consistent with the triton-helion model.


Resonant Electron Transfer And L-Shell Excitation For _{26}Fe^{19+} And _{30}Zn^{23+} Ions, Hassan Ramadan Jan 2012

Resonant Electron Transfer And L-Shell Excitation For _{26}Fe^{19+} And _{30}Zn^{23+} Ions, Hassan Ramadan

Turkish Journal of Physics

Resonant transfer and excitation (RTE) involving simultaneous electron capture and projectile L-shell excitation has been calculated for Fe^{19+} and Zn^{23+} ions, in charge states ranging from nitrogen-like to oxygen-like incident on molecular hydrogen over an energy range 0--250 MeV. By the same way the calculations have been performed with helium over an energy range 0--300 MeV. The calculations are carried out using the angular momentum average (AMA) scheme in the isolated resonance approximation (IRA). This method was previously used to calculate RTE cross sections for N-like P^{8+} and Ca^{13+}, where the results are found to agree with the present calculations. …


The Impact Of Hyperfine Interaction On The Charge Radius Of Protons, Majid Amirfakhrian Jan 2012

The Impact Of Hyperfine Interaction On The Charge Radius Of Protons, Majid Amirfakhrian

Turkish Journal of Physics

In this paper, the wave function of a Proton has been calculated via solving the Dirac equation for a three-particle system. Then, the charge radius of the proton was measured. Isospin-Isospin interaction was added to the system as a perturbation factor, and the variation of the charge radius of Proton was considered. Finally, the spin-spin and spin-isospin interactions on the charge radius of the Proton were calculated based on this method.


Bianchi-V Cosmological Models With Viscous Fluid And Constant Deceleration Parameter In General Relativity, Sharad Kandalkar, Pramod Khade, Mohini Gaikwad Jan 2012

Bianchi-V Cosmological Models With Viscous Fluid And Constant Deceleration Parameter In General Relativity, Sharad Kandalkar, Pramod Khade, Mohini Gaikwad

Turkish Journal of Physics

In this paper we discuss the variation law for Hubble's parameter, average scale factor in spatially homogenous anisotropic Bianchi Type V space-time that yields a constant value deceleration parameter. Using the law of variation for Hubble's parameter, exact solutions of Einstein's field equations are obtained for Bianchi-V space time filled with viscous fluid in two different cases where the universe exhibits power law and exponential expansion. We investigate a number of solutions with constant and time varying cosmological constant together with variable and constant bulk viscosity. We find that the constant value of deceleration parameter is reasonable for the present …


A Fresh Look At Thermal Field Emission From Tungsten Tip, Ahmed Abdurrahman Ahmed Al-Tabbakh Jan 2012

A Fresh Look At Thermal Field Emission From Tungsten Tip, Ahmed Abdurrahman Ahmed Al-Tabbakh

Turkish Journal of Physics

Electron emission from clean tungsten tips has been investigated at different temperatures and applied electric field. Emission mechanism is analyzed on the basis of the Fowler-Nordheim (FN) model and a parameter extraction model based on elimination of field enhancement factor. The suggested extraction model of the physical and geometrical parameters is found fairly adequate to resolving the apparently confusing behavior of these parameters and shedding light on the emission mechanism. The observed linear FN plots at low temperatures confirm the predominating effect of the applied field on the electron emission. At elevated temperatures, emission is found to fall in the …


Nuclear Structure Of Even-Even Ge Isotopes By Means Of Interacting Boson Models, Abdul R. H. Subber Jan 2011

Nuclear Structure Of Even-Even Ge Isotopes By Means Of Interacting Boson Models, Abdul R. H. Subber

Turkish Journal of Physics

Interacting Boson Models IBM-1and IBM-2, have been used to calculate energy levels and nuclear properties of the even-even Ge isotopes from A = 64 to A = 80. Energy levels of the low lying states of these nuclei were produced, the electric quadruple reduced transition probabilities B(E2) were calculated as well. Mixing ratios \delta (E2/M1) for transitions with \Delta I=0, I \ne 0 were calculated. All the results are compared with available experimental data and other IBM versions and calculations. Satisfactory agreements were produced.


Delta Excitation Calculation Studies In The Ground State Of The Compressed Finite Heavy Doubly-Magic Nucleus ^{100}Sn, Mohammed Hassen Eid Abu-Sei'leek Jan 2011

Delta Excitation Calculation Studies In The Ground State Of The Compressed Finite Heavy Doubly-Magic Nucleus ^{100}Sn, Mohammed Hassen Eid Abu-Sei'leek

Turkish Journal of Physics

The energies and matter densities of finite nuclei under radial compression are investigated by using a constrained Hartree-Fock method with the \Delta degree of freedom included. The results are presented for the doubly-magic nucleus ^{100}Sn in an effective baryon-baryon interaction. It is found that as the nucleus is compressed to about three time of the ordinary nuclear density, the \Delta component is sharply increased to about 17% of all baryons in the system. This result is consistent with the values extracted from relativistic heavy-ion collisions. The single particle energy levels calculated and their behaviors under compression examined too. A good …


Hall Effect On Mhd Forced Convection From An Infinite Porous Plate With Dissipative Heat In A Rotating System, Nazibuddin Ahmed, Jiwan Krishna Goswami Jan 2011

Hall Effect On Mhd Forced Convection From An Infinite Porous Plate With Dissipative Heat In A Rotating System, Nazibuddin Ahmed, Jiwan Krishna Goswami

Turkish Journal of Physics

An attempt has been made to study the Hall effect on MHD forced convection from an infinite horizontal porous plate with dissipative heat in a rotating system with uniform free stream when the temperature at the plate varies periodically with time. The entire system rotates with a constant angular velocity about the normal to the plate. A uniform magnetic field is assumed to be applied along the normal to the plate directed into the fluid region. The governing equations are solved analytically. The expressions for the velocity and temperature field are obtained in non-dimensional form. The skin friction due to …


Effect Of Nitrogen Incorporation On The Electronic And Optical Properties Of Algaasn/Gaas Quantum Well Lasers, Boualem Merabet, Abdelhadi Lachebi, Hamza Abid Jan 2011

Effect Of Nitrogen Incorporation On The Electronic And Optical Properties Of Algaasn/Gaas Quantum Well Lasers, Boualem Merabet, Abdelhadi Lachebi, Hamza Abid

Turkish Journal of Physics

In order to investigate the profound effect of small amounts of nitrogen incorporated into the III-V systems on the fundamental band gap, which decreases dramatically with increasing of N^+ implantation, we present a pseudopotential formalism within the Virtual Crystal Approximation confronted to the Band Anti-crossing model, which parameterizes successfully such behaviour, so as to study the electronic and optical properties of dilute Al_xGa_{1-x}As_{1-y}N_y materials, prepared by implantation of N^+ into epitaxial AlGaAs. Analytical formulas of quantized energy levels in AlGaAsN quantum well (QW) lasers and optical transition wavelengths between subbands are presented and compared to simulations based on our programs.


The Low Temperature Resistivity Of Thermally Evaporated Antiferromagnetic Mn_{100-X} Ru_X Thin Films, Francis Kofi Ampong, Francis Boakye Jan 2011

The Low Temperature Resistivity Of Thermally Evaporated Antiferromagnetic Mn_{100-X} Ru_X Thin Films, Francis Kofi Ampong, Francis Boakye

Turkish Journal of Physics

Electrical resistivity measurements on thermally evaporated Mn_{100-x} Ru_x thin films (with x = 0.05 at.% Ru and x = 2.5 at.% Ru) have been carried out over the temperature range from 300 to 1.4 K. A behaviour typical of the bulk \alpha-Mn has been observed on the film with x = 0.05 at.% Ru. The Néel point of this specimen is established at 90 \pm 1 K which is typical of the bulk. This Néel point is raised to 100 \pm 1 K with x = 2.5 at.% Ru in \alpha-Mn. A relatively long range magnetic ordering was observed with …


Comparing Optical Sensing Using Slab Waveguides And Total Internal Reflection Ellipsometry, Sofyan A. Taya, Taher M. El-Agez Jan 2011

Comparing Optical Sensing Using Slab Waveguides And Total Internal Reflection Ellipsometry, Sofyan A. Taya, Taher M. El-Agez

Turkish Journal of Physics

The sensitivity of the effective refractive index of slab waveguide sensors to variations in the refractive index of the cladding is compared to that of the ellipsometric parameters. The changes of the effective refractive index of a waveguide and the ellipsometric parameter \Delta , due to the index change of the cladding, were derived and plotted as a function of the guiding layer thickness and with the index of the cladding. It is found that these changes almost have the same overall feature but the ellipsometric parameters showed considerable higher sensitivity than the effective index of the conventional waveguide optical …


Theoretical Calculation Of Energy Levels Of Pb Iii, Chao Zhou, Jian Jian Cao, Liang Liang, Ling Zhang Jan 2011

Theoretical Calculation Of Energy Levels Of Pb Iii, Chao Zhou, Jian Jian Cao, Liang Liang, Ling Zhang

Turkish Journal of Physics

In this paper, the results of theoretical calculation of five Rydberg series energy levels 5d_{3/2} \to np_{1/2} (n=6--20), 5d_{3/2} \to nf_{5/2} (n=5--20), 5d_{5/2} \to np_{3/2} (n=6--20), 5d_{5/2} \to nf_{7/2} (n=5-20) and 5d_{5/2} \to nf_{5/2} (n=5-20) for Pb III ions are presented using the weakest bound electron potential model (WBEPM) theory, considering foreign level perturbation corrections. The theoretically calculated results agree very well with present known experimental data, and some energy levels without experimental values are predicted.


A 3d Model For Thickness And Diffusion Capacitance Of Emitter-Base Junction Determination In A Bifacial Polycrystalline Solar Cell Under Real Operating Condition, Senghane Mbodji, Babacar Mbow, Fabe Idrissa Barro, Gregoire Sissoko Jan 2011

A 3d Model For Thickness And Diffusion Capacitance Of Emitter-Base Junction Determination In A Bifacial Polycrystalline Solar Cell Under Real Operating Condition, Senghane Mbodji, Babacar Mbow, Fabe Idrissa Barro, Gregoire Sissoko

Turkish Journal of Physics

This paper aims at presenting the behaviour of the space charge region for an n^+-p-p^+ bifacial solar cell under monochromatic illumination. It also deals with mathematical relations in the describing and the use of new approach that involves both junction and back surface recombination velocities with a 3D modelling study. Based on the normalized carriers' density, versus base depth, the space-charge layer thickness (Z_{0,u}) is studied for various parameters such as grain size g, grain boundaries recombination velocity S_{gb}, wavelength \lambda and for different operating conditions. Therefore, the relationship between Z_{0,u} and the diffusion capacitance C_u show that junction in …


Stress-Strain Characteristics, Dynamic Recrystallization, Grain Growth, And Melting Point Of The Binary And Ternary Solder Alloys, Shakib Moqbel Ali Mohammed Alsowidy, Mohammed Ali Shukri Jan 2011

Stress-Strain Characteristics, Dynamic Recrystallization, Grain Growth, And Melting Point Of The Binary And Ternary Solder Alloys, Shakib Moqbel Ali Mohammed Alsowidy, Mohammed Ali Shukri

Turkish Journal of Physics

An advanced solder alloy, Pb-10wt%Sn-3wt%Zn, has been developed to improve the mechanical properties of the Pb-10wt%Sn based solders. Deformation behavior of Pb-10wt%Sn and Pb-10wt%Sn-3wt%Zn alloys was investigated in tension at strain rates from 0.005% to 0.25% s^{-1} in the temperature range 383--433 K. The stress-strain characteristics curves showed two deformation modes: (i) continuous work softening and fracture following a sharp stress in Pb-10wt%Sn, (ii) work hardening with steady-state flow and fracture just after yielding in Pb-10wt%Sn-3wt%Zn. In the work softening type, relatively coarse grains ranging from 30 to 60 \mu m are produced by dynamic recrystallization (DRX). In the work …


Anharmonic Properties Of Potassium Halide Crystals, Krishna Murti Raju Jan 2011

Anharmonic Properties Of Potassium Halide Crystals, Krishna Murti Raju

Turkish Journal of Physics

An effort has been made to obtain the anharmonic properties of potassium halides starting from primary physical parameters viz. nearest neighbor distance and hardness parameters assuming long- and short- range potentials at elevated temperatures. The elastic energy density for a deformed crystal can be expanded as power series of strains for obtaining coefficients of quadratic, cubic and quartic terms which are known as the second, third and fourth order elastic constants respectively. When the values of the higher order elastic constants are known for a crystal, many of the anharmonic properties of the crystal can be treated within the limit …


Effects Of Silar Cycle On The Electrical Characteristics Of Cd/Cdse/N-Si/Au-Sb Structure, Betül Güzeldi̇r, Mustafa Sağlam, Aytünç Ateş Jan 2011

Effects Of Silar Cycle On The Electrical Characteristics Of Cd/Cdse/N-Si/Au-Sb Structure, Betül Güzeldi̇r, Mustafa Sağlam, Aytünç Ateş

Turkish Journal of Physics

Cd/CdSe/n-Si/Au-Sb structures have been fabricated by Successive Ionic Layer Adsorption and Reaction (SILAR) method under various SILAR cycles. The characteristics parameters of these structures such as barrier height, ideality factor, series resistance are calculated from the current-voltage (I-V) measurements and the barrier height, carrier concentration are calculated from reverse bias capacitance-voltage (C-V) measurements at 300 kHz frequency and room temperature. Furthermore, the density distribution and rectifying ratio of these structure have been calculated from the I-V measurements as a function of SILAR cycle. It has been seen that the changes of characteristic parameters such as barrier height, ideality factor and …


Estimating Global Solar Radiation From Common Meteorological Data In Aranjuez, Spain, Javier Almorox Jan 2011

Estimating Global Solar Radiation From Common Meteorological Data In Aranjuez, Spain, Javier Almorox

Turkish Journal of Physics

This study aimed to calibrate existing models and develop a new model for estimating global solar radiation data using commonly and available measured meteorological records such as precipitation or temperature. Fifteen empirical global radiation models based on meteorological variables were generated and validated using daily data in 2003-2008 at the Aranjuez station (Community of Madrid, Spain). Validation criteria included coefficient of determination, root mean square error, mean bias error, mean absolute bias error, mean percentage error, and mean absolute percentage error. The best result was derived from the model proposed, which uses extraterrestrial solar radiation, saturation vapor pressures, transformed rainfall …


Resonance Phenomena And Time Asymmetric Quantum Mechanics, Arno Rudolf Bohm, Fati̇h Erman, Haydar Uncu Jan 2011

Resonance Phenomena And Time Asymmetric Quantum Mechanics, Arno Rudolf Bohm, Fati̇h Erman, Haydar Uncu

Turkish Journal of Physics

This article is a review of time asymmetric quantum theory and its consequences applied to the resonance and decay phenomena. We first give some phenomenological results about resonances and decaying states to support the popular idea that resonances characterized by a width \Gamma and decaying states characterized by a lifetime \tau are different appearances of the same physical entity. Based on Weisskopf-Wigner (WW) methods, one obtains approximately \frac{\hbar}{\tau}\approx \Gamma. However, using standard axioms of quantum physics it is not possible to establish a rigorous theory to which the various WW methods can be considered as approximations. In standard quantum theory, …


Application Of Active-Osl Approximation To Some Experimental Optical Stimulated Luminescence Decay, Ayşe Güneş Tanir, Mustafa Hi̇cabi̇ Bölükdemi̇r Jan 2011

Application Of Active-Osl Approximation To Some Experimental Optical Stimulated Luminescence Decay, Ayşe Güneş Tanir, Mustafa Hi̇cabi̇ Bölükdemi̇r

Turkish Journal of Physics

In this work, Active-OSL Approximation (AOSLA) suggested by our previous study was applied to experimental optical stimulated luminescence decay from some sediment samples. The explanation of the AOSLA was based on the radioactive decay law of successive disintegration. It allows obtaining the peak forms of luminescence mechanism. This work shows that detrapping constants that have great importance in dating and dosimeters studies can be rapidly and clearly found using the AOSLA. Also, it can be concluded that the OSL is a process similar to the radioactive decay law of successive disintegration.


Exotic Localized Structures Based On The Symmetrical Lucas Function Of The (2+1)-Dimensional Generalized Nizhnik-Novikov-Veselov System, Emad A-B. Abdel-Salam, Zeid I. A. Al-Muhiameed Jan 2011

Exotic Localized Structures Based On The Symmetrical Lucas Function Of The (2+1)-Dimensional Generalized Nizhnik-Novikov-Veselov System, Emad A-B. Abdel-Salam, Zeid I. A. Al-Muhiameed

Turkish Journal of Physics

Based on the Lucas Riccati method and a linear variable separation method, new variable separation solutions of the (2+1)-dimensional generalized Nizhnik-Novikov-Veselov system are derived. Then, we give a positive answer for the following question: Are there any localized excitations derived by the use of another functions? For this purpose, some attention will be paid to dromion, peakon, multi dromion-solitoff excitations, regular fractal dromions, stochastic fractal dromion structure and combined structures including bell-like compactons, peakon-like compactons and compacton-like semi-foldons based on the golden main. With the help of the modified Weierstrass function, we discuss the stochastic fractal dromion structure both analytically …


Molecular Interaction Studies In Binary Mixtures Containing Aniline, Toluene And N-Butanol, Palaniappan Lakshmanan, Mahendran Govindasamy Jan 2011

Molecular Interaction Studies In Binary Mixtures Containing Aniline, Toluene And N-Butanol, Palaniappan Lakshmanan, Mahendran Govindasamy

Turkish Journal of Physics

Ultrasonic velocity and density values have been measured at 303 K in binary mixtures containing aniline, toluene and n-butanol; and the thermodynamical approach is applied to evaluate the mixtures' molar volume, adiabatic compressibility, intermolecular free length and excess values. The observed results are interpreted in terms of molecular interaction between the components of the mixtures. Observed excess values and their fittings of R-K type equations lend further support to the observation made in the binary system.