015590   Hafez M G;Taluker M R;Ali M H (Mathematics Dep, Chittagong Univ of Engineering and Technology, Chittagong-4349, Bangladesh, Email: golam_hafez@yahoo.com) : Nonlinear propagation of weakly relativistic ion-acoustic waves in electron-positron-ion plasma. Pramana J Phys 2016, 87(5), 1-10.

This work presents theoretical and numerical discussion on the dynamics of ion-acoustic solitary wave for weakly relativistic regime in unmagnetized plasma comprising non-extensive electrons, Boltzmann positrons and relativistic ions. In order to analyse the nonlinear propagation phenomena, the Korteweg-de Vries(KdV) equation is derived using the well-known reductive perturbation method. The integration of the derived equation is carried out using the ansatz method and the generalized Riccati equation mapping method. The influenceof plasma parameters on the amplitude and width of the soliton and the electrostatic nonlinear propagation of weakly relativistic ion-acoustic solitary waves are described. The obtained results of the nonlinear low-frequencywaves in such plasmas may be helpful to understand various phenomena in astrophysical compact object and space physics.

6 illus, 39 ref

015589   Habibi M;Mahtab M (Energy Engineering and Physics Dep, Amirkabir Univ of Technology, Tehran, Iran, Email: mortezahabibi@aut.ac.ir) : Experimental study of soft X-ray intensity with different anode tips in Amirkabir plasma focus device. Pramana J Phys 2016, 87(1), 1-5.

To study the effect of different anode tip geometries on the intensity - 55 - of soft X-rays emitted from a 4 kJ plasma focus device (PFD), we considered five different anode tips which were cylindrical-flat, cylindricalhollow, spherical-convex, cone-flat and cone-hollow tips. BPX-65 PIN diodes covered by four different filters are used to register the intensity of soft X-rays. The use of cone-flat anode tip has augmented the emitted X-ray three times compared to the conventional cylindrical-flat anode.

7 illus, 2 table, 14 ref

015588   Gobinath E;Jeyavijayan S;Xavier R J (Physics Dep, Kalasalingam Univ, Krishnankoil-626 126, Email: gobinath03@yahoo.co.in) : Spectroscopic investigations, DFT computations and other molecular properties of 2,4-dimethylbenzoic acid. Indian J pure appl Phys 2017, 55(8), 541-50.

The molecular vibrations of 2,4-dimethylbenzoicacid (DMBA) have been investigated by recording Fourier transform infrared (FTIR) and FT-Raman spectroscopy. The complete vibrational assignment and analysis of the fundamental modes of the compound have been carried out using the experimental data and quantum chemical studies from DFT calculations employing MPW1PW91 and B3LYP methods employing 6-311++G(d,p) basis set. The ¹H and ¹³C NMR chemical shifts have been calculated with the GIAO method using the optimized parameters obtained from B3LYP/6-311+G(d,p) method. Important thermodynamic properties and electronic properties have been calculated. Low value of HOMO-LUMO energy gap suggests the possibility of intramolecular charge transfer in the molecule. Furthermore, the first hyperpolarizability and total dipole moment of the molecule have been calculated.

5 illus, 6 tables, 30 ref

015587   Gaikwad D K;Pawar P P;Selvam T P (Physics Dep, Dr. Babasaheb Ambedkar Marathwada Univ, Aurangabad-431 004, Email: dhammajyotg26@gmail.com) : Measurement of attenuation cross sections of fatty acids in the energy range 122-1330 Ke V. Pramana J Phys 2016, 87(1), 1-7.

The mass attenuation coefficients (μm) have been measured for undecylic acid (C₁₁H₂₂O₂), lauric acid (C₁₂H₂₄O₂), tridecylic acid (C₁₃H₂₆O₂), myristic acid (C₁₄H₂₈O₂), pentadecylic acid (C₁₅H₃₀O₂) and palmitic acid (C₁₆H₃₂O₂) using ⁵⁷Co, ¹³³Ba, ¹³⁷Cs, ⁶⁰Co and ²²Na emitted γ radiation with energies 122, 356, 511, 662, 1170, 1275 and 1330 keV, respectively. The accurate values of the effective atomic number (Zeff), atomic cross-section (σ_t), electronic cross-section (σ_e) and the effective electron density (N_eff) have great significance in radiation protection and dosimetry. These quantities were obtained by utilizing experimentally measured values of mass attenuation coefficients (μ_m). A NaI(Tl) scintillation detector with 8.2% (at 662 keV) resolution was used for detecting of attenuated γ-photons. The variation in Z_eff and N_eff of fatty acids with energy is discussed. The experimental and theoretical results are in good agreement within 2% deviation.

5 illus, 6 table, 29 ref

015586   Esme A (Elementary Science Education Dep, Kocaeli Univ, Kocaeli 41380, Turkey, Email: asliesme@gmail.com) : Quantum chemical calculations on the geometrical, conformational, spectroscopic (FTIR, FT-raman) analysis and NLO activity of milrinone [5-cyano-2-methyl-(3,4'-bipyridin)-6(1h)-one] by using hartree-fock and density functional methods. Indian J pure appl Phys 2017, 55(7), 478-89.

The Fourier transform infrared (FTIR) and Fourier transform Raman (FT-Raman) spectra of milrinone [5-Cyano-2-methyl-(3,4'-bipyridin)-6(1H)-one] in solid phase have been recorded and analyzed. Quantum chemical calculations of the optimized molecular structure, energies, molecular surfaces, conformational, nonlinear optical (NLO) properties and vibrational studies of milrinone have been calculated by using hartree-fock (HF) and density functional theory (DFT/B3LYP) with 6-31G(d,p) basis set. Obtained results on the geometric structure are compared with the experimental X-ray diffraction. The calculated highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies also confirm that charge transfer occurs within the molecule. Molecular parameters like global hardness (η), global softness (σ) and electronegativity (χ) have been calculated with the results obtained from the HOMO and LUMO molecular orbital energies. Nonlinear optical parameters [mean polarizability (α), the anisotropy of the polarizability (Δα) and the mean first-order hyperpolarizability (β)] of the title compound have - 54 - been investigated theoretically. A detailed interpretation of the infrared and raman spectra of milrinone have been performed with HF and DFT calculations and the potential energy distribution (PED) obtained from the vibrational energy distribution analysis (VEDA4) program.

6 illus, 4 tables, 52 ref

015585   Eslamizadeh H (Physics Dep, Persian Gulf Univ, 7516913817 Bushehr, Iran, Email: m_eslamizadeh@yahoo.com) : Influence of nuclear dissipation on fission dynamics of the excited nucleus <. Pramana J Phys 2016, 87(1), 1-7.

A stochastic approach to fission dynamics based on two-dimensional Langevin equations was applied to calculate the anisotropy of the fission fragments angular distribution and average pre-scission neutron multiplicities for the compound nucleus ²⁴⁸Cf formed in the ¹⁶O+²³²Th reactions. Postsaddle nuclear dissipation strength of (12-14) x 10²¹ s^-1 was extracted for Cf nucleus by fitting the results of calculations with the experimental data. Furthermore, it was found that the results of calculations for the anisotropy of the fission fragments angular distribution and pre-scission neutron multiplicities are very sensitive to the magnitude of post-saddle nuclear dissipation.

5 illus, 44 ref

015584   Erken O;Gunes M;Ozaslan D;Gumus C (Physics Dep, Faculty Science and Letters, Adiyaman Univ, Adiyaman 02040, Turkey, Email: cgumus@cu.edu.tr) : Effect of the deposition time on optical and electrical properties of semiconductor ZnS thin films prepared by chemical bath deposition. Indian J pure appl Phys 2017, 55(7), 471-7.

Semiconductor ZnS thin films have been deposited by a chemical bath deposition (CBD) on a glass substrate at 80 °C with different deposition time (4, 6 and 8 h). The films have been further studied in order to determine the change in optical and electrical properties as a function of deposition time. The film thicknesses have been calculated between 210-1375 nm by using gravimetrical analysis. The optical properties - 53 - of ZnS thin films have been determined by transmittance (%T) and absorbance (A) measurements by UV-Vis spectroscopy operated wavelength range between 300 and 1100 nm at room temperature. The optical transmittance values of ZnS thin films in the visible region of the electromagnetic spectrum have been found to be between 51-90%. The calculations indicate that the refractive index (n) in the visible region is between 1.40 and 2.45. The optical band gaps (E_g) of thin films have been calculated between 3.61-3.88 eV while the band edge sharpness values (B) are varied between 6.95 x 10⁹-8.96 x 10¹⁰ eV/cm². The specific resistivity values (ρ) of the films are found to be between 1.08 x 10⁵-1.01 x 10⁶ Ω.cm and exhibit an n-type conductivity by Hall measurement.

7 illus, 1 table, 36 ref

015583   Elkilany S A (Mathematics Dep, Faculty of Science, Dammam Univ, Dammam, Kingdom of Saudi Arabia, Saudi Arabia, Email: sabbelkilany@yahoo.com) : Formation of ground and excited hydrogen atoms in proton-potassium inelastic scattering. Pramana J Phys 2016, 87(5), 1-13.

The inelastic scattering of proton with a potassium atom is treated for the first time as a three channel problem within the framework of the improved coupled static approximation by assuming that the ground (1s state) and the excited (2s state) hydrogen formation channels are open for seven values of total angularmomentum, l(0 ≤ l ≤ 6) at energies between 50 and 500 keV. The Lipmann-Swinger equation and the Green's function iterative numerical method are used to calculate iterative partial and total cross-sections. This can be doneby calculating the reactance matrix at different values of the considered incident energies to obtain the transition matrix that gives partial and total cross-sections. Present results are in reasonable agreement with previous results.

6 illus, 15 ref

015582   Eghdamtalab M;Kanaani A (NO, Malek Ashtar Univ of Technology, Tehran, Iran, Email: a.kanaani@std.du.ac.ir) : The effect of solvent polarity on solubility of HMX and FOX-7: A DFT study. Indian J pure appl Phys 2017, 55(7), 490-6.

Production of micro and submicron-sized particles with a narrow particle size distribution (PSD) is gaining interests in materials technology especially in specialty chemicals. There are many conventional methods for the size reduction of particles such as milling, grinding, crushing, spray drying, and recrystallization from liquid solutions. A new, promising process for particulation of materials employs environmentally benign compressed gases as either solvents or anti-solvents. The molecular geometry of HMX and FOX-7 has been calculated by using the density functional method (B3LYP) invoking 6-311++G(d,p) basis set.The solvent effect was treated using a continuum model as modeled in hexane, benzene, chloroform, tetrahydrofurane, acetone, ethanol, methanol, dimethylformamide, acetonitrile and DMSO. Furthermore, dipole moment (D), polarizability (α),molecular electrostatic potential map (MEP), thermodynamic, frontier molecular orbital analysis (HOMO-LUMO), hardness (η), electronic chemical potential (μ), global electrophilicity index (ω) and ΔG_solv properties for HMX and FOX-7 in several solvents have been investigated and discussed. It is found that with an increasing solvent dielectric constant, the dipole moment of the molecules under study also increases.

5 illus, 5 tables, 37 ref

015581   Eftekhari-Zadeh E;Feghhi S A H;Roshani G (Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad Univ, Kermanshah, Iran, Email: e.eftekharizade@yahoo.com) : Hybrid combination of multi-layer perceptron and neutron activation analysis in cement prediction. Pramana J Phys 2017, 88(2), 25-30.

Determination of concentration of major elements such as Ca, Si, Al, and Fe in cement is very important for quality control during its production, correct classification according to the existing standards, and thus for appropriate use in the construction industry. For this purpose, neutron activation analysis is verysuitable. In this preliminary theoretical work, the irradiation and consecutive measurement of the percentage of the constituent elements in different cement samples were done using MCNPX with γ-ray spectra as the output. Specific peaks of Ca, Si, Al, and Fe obtained from these spectra were used as input for artificial neural network (18 of them for training and 8 for testing) resulting in the determination of each element in the given sample. The mean absolute errors of the results are less than 0.4, which is very promising for the future xperimental work where the uncertainties are usually one order higher.

3 illus, 6 tables, 34 ref

015580   Dhar S;Nahar N (Mathematics Dep, Chittagong Univ of Engineering and Technology, Chittagong 4349, Bangladesh, Email: sdhar03@yahoo.com) : Triple differential cross-sections for the ionization of metastable 2P-state hydrogen atoms by electrons with exchange effects. Pramana J Phys 2016, 87(5), 1-7.

In this paper, triple differential cross-sections for the ionization of metastable 2P-state hydrogen atoms by 250 eV electron energy with exchange effects for various kinematic conditions are calculated. Multiple scattering theory proposed by Das and Seal in Phys. Rev. A 47, 2978 (1993) is utilized here. The computational results provide significant peak features that show good qualitative agreement with the hydrogenic ground-state experimental data and theoretical results and the present first Born results. In addition, physical origin of the peaks of the cross-section curves is investigated.

4 illus, 43 ref

015579   Choudhary S (Dielectric Research Laboratory, Physics Dep, Jai Narain Vyas Univ, Jodhpur-342 005, Email: shobhnachoudhary@rediffmail.com) : Characterization of SiO₂ nanoparticles dispersed (PVA-PEO) blend based nanocomposites as the polymeric nanodielectric materials. Indian J Engng Mater Sci 2016, 23(6), 399-410.

Polymer nanocomposite (PNC) films consisting of poly(vinyl alcohol) (PVA) and poly(ethylene - 51 - oxide) (PEO) blend matrix dispersed with nanosize particles of silicon dioxide (SiO₂) [i.e., (PVA-PEO)-x wt % SiO₂, where x is 0, 1, 3 or 5] have been prepared by aqueous solution-cast method. The structural properties of the PNCs are characterized by X-ray diffraction measurements, which confirm the semi-crystalline structures of these materials. The complex dielectric function, alternating current electrical conductivity, electric modulus and impedance spectra of the PNC films have been investigated in the frequency range 20 Hz to 1 MHz by employing the dielectric relaxation spectroscopy. Effects of SiO₂ concentrations and temperatures on the dielectric permittivity, electrical conductivity and structural dynamics of these PNC materials have been explored. The dielectric relaxation mechanism of the PVA-PEO blend based these materials is mainly governed by the PEO chain segmental dynamics. The relaxation times and conductivity activation energies of the PNC films are determined from the Arrhenius plots. Dielectric and electrical parameters values reveal the suitability of these materials as low-permittivity nanodielectrics for the radio frequency electric field.

17 illus, 2 tables, 61 ref

015578   Campos D (NO, Universidad La Gran Colombia, Carrera 6 No. 12B-12, Bogota, Colombia, Email: diogenes.campos@ygv.edu.co) : Phase-space treatment of the driven quantum harmonic oscillator. Pramana J Phys 2017, 88(3), 119-138.

A recent phase-space formulation of quantum mechanics in terms of the Glauber coherent states is applied to study the interaction of a one-dimensional harmonic oscillator with an arbitrary time-dependent force. Wave functions of the simultaneous values of position q and momentum p are deduced, which in turn give the standard position and momentum wave functions, together with expressions for the ηth derivatives with respect to q and p, respectively. Afterwards, general formulae for momentum, position and energy expectation values are obtained, and the Ehrenfest theorem is verified. Subsequently, general expressions for the cross-Wigner functions are deduced. Finally, a specific example is considered to numerically and graphically illustrate some results.

8 illus, 1 table, 20 ref

015577   Biswas D;Poria S;Patra S N (Basic Science Dep, Humanities and Social Science, Calcutta Institute of Engineering and M, 24/1A, Chandi Ghosh Road, Kolkata-700 040, Email: swarup_p@yahoo.com) : Phenomenological approach to describe logistic growth and carrying capacity-dependent growth processes. Pramana J Phys 2016, 87(5), 1-9.

In this communication, different classes of phenomenological universalities of carrying capacity dependent growth processes have been proposed. The logistic as well as carrying capacity-dependent West-type allometry-based biological growths can be explained in this proposed framework. It is shown that logistic and carrying capacity-dependent West-type growths are phenomenologically identical in nature. However, there is a difference between them in terms of coefficients involved in the phenomenological descriptions. Involuted Gompertz function, used to describe biological growth processes undergoing atrophy or a demographic and economic system undergoing involution or regression, can be addressed in this proposed environment-dependent description. It is also found phenomenologically that the energy intake of an organism depends on carrying capacity whereas metabolic cost does not depend on carrying capacity. In addition, some other phenomenologicaldescriptions have been examined in this proposed framework and graphical representations of variation of different parameters involved in the description are executed.

2 illus, 1 table, 34 ref

015576   Bhoi J;Laha U (Physics Dep, Government College of Engineering, Kalahandi-766 002, Email: ujjwal.laha@gmail.com) : Hulthen potential models for α-α and α-He<. Pramana J Phys 2017, 88(3), 13-18.

Simple Hulthen-type potential models are proposed to treat the α-α and α-He³ elastic scattering. The merit of our approach is examined by computing elastic scattering phases through the judicious use of the phase function method. Reasonable agreements in scattering phase shifts are obtained with the standard data.

5 illus, 1 table, 27 ref

015575   Bharracharyya I;Goswami D (Chemistry Dep, Indian Institute of Technology, Kanpur-208 016, Email: dgoswami@iitk.ac.in ) : Two-dimensional imaging of a second- order nonlinear optical process. Curr Sci 2017, 112(4), 830-4.

Spatiotemporal imaging of sum-frequency generation process through second-order nonlinear optical interaction in a nonlinear crystal under femtosecond pulsed illumination is presented. Two focal points in the spatial dimension that result from use of widely separated wavelengths (780 and 1560 nm) including their appropriate intensity ratios are captured accurately, emphasizing the sensitivity and robustness of this detection scheme. Most importantly, crosscorrelation width that is used as characteristic measure from such techniques remains constant at the two focal points. However, this highlights the critical role of nonlinear crystal position along beam propagation axis during such collinear intensity cross-correlation measurements involving different wavelengths.

7 illus, 12 ref

015574   Bhardwaj S B;Singh R M;Mishra S C (Physics Dep, Chaudhary Devi Lal Univ, Sirsa-125 055, Email: sbbhardwaj09@gmail.com) : Quantum mechanics of PT and non-PT -symmetric potentials in three dimensions. Pramana J Phys 2016, 87(1), 1-11.

With a view of exploring new vistas with regard to the nature of complex eigenspectra of a non-Hermitian Hamiltonian, the quasi-exact solutions of the Schrodinger equation are investigated for a shifted harmonic potential under the framework of extended complex phase-space approach. Analyticity property ofthe eigenfunction alone is found sufficient to throw light on the nature of the eigenvalues and eigenfunctions of a system. Explicit expressions of eigenvalues and eigenfunctions for the ground state as well as excited state including their PT-symmetric version are worked out.

17 ref

015573   Behmanesh B;Rezaei-Ochbelagh D; Azizian-Kalandaragh Y;Imanzadeh-Karkaragh G (Physics Dep, Univ of Mohaghegh Ardabili, Ardabili, Iran, Email: yashar.a.k@gmail.com) : Sonochemical preparation of Ag₂O- PVA nanocomposites: Study on pertinent structural and optical properties and exploring the effect of gamma and neutron irradiation. Curr Sci 2017, 112(4), 735-42.

In the paper, Ag2O-PVA nanocomposites have been prepared by ultrasound-assisted method and the effect of gamma and neutron irradiation has been studied on their optical and structural properties. X-ray diffraction patterns and thermogravimetric analyses also confirm the formation of silver oxide nanoparticles in polyvinyl alcohol polymer. The optical changes in the samples induced by gamma and neutron irradiation were revealed through Fourier transform infrared and diffusive reflectance spectroscopy. Surface morphology of the as-prepared, irradiated and nonirradiated samples has been studied by scanning electron microscopy. The results confirm the observed changes in both optical and structural properties.

12 illus, 37 ref

015572   Bayan S;Pegu L;Mohanta D (Nanoscience and Soft Matter Laboratory, Physics Dep, Tezpur Univ, Tezpur, Assam-784 028, Email: best@tezu.ernet.in) : Catalyst-free growth and luminescence response of single-crystalline ZnO nanorods. Indian J pure appl Phys 2017, 55(7), 512-17.

The production mechanism of single crystalline ZnO nanoscale rods, either in array or block form has been reported alongwith their optical emission characteristics. The elongated vertical nanorods have been characterized by a preferred growth direction along (002) crystallographic plane which becomes prominent with the growth duration. The single-crystalline nature of the nanorods is evident from the electron diffraction studies. Apart from the vertical nanorods, random nanorods and hexagonal shaped nano-blocks have also been found upon changing the pH of the growth solution. With a reference to the relevant growth mechanism of the nanostructures, the optical emission due to band edge and various native defects have been identified via normalized Gaussian fitting incorporated onto the photoluminescence spectra. In contrast to the blocks of nanodisks and random nanorods, the band edge emission (<126>388 nm) has been found to be significantly enahnced over defect mediated emissions in the vertical nanorods. Owing to long range ordering and enhanced periodicity, single crystalline ZnO would find better scope as compared to conventional polycrystalline systems.

6 illus, 1 table, 20 ref

015571   Basingwa J;Kara A H;Bokhari A H;Mousa R A; Zaman F D (School of Mathematics, Univ of the Witwatersrand, Johannesburg, P.O. Bag 3 Wits 2050, South Africa, Email: Abdul.Kara@wits.ac.za) : Symmetry and conservation law structures of some anti-self-dual (ASD) manifolds. Pramana J Phys 2016, 87(5), 1-6.

The ASD systems and manifolds have been studied via a number of approaches and their origins have been well documented. In this paper, we look at the symmetry structures, variational symmetries and related concepts around the associated conservation laws for a number of such manifolds.

24 ref

015570   Basaran S;Sivrioglu S (Mechanical Engineering Dep, Gebze Technical Univ, Gebze, Turkey, Email: s.selim@gtu.edu.tr) : Levitation force analysis of ring and disk shaped permanent magnet-high temperature superconductor. Indian J pure appl Phys 2017, 55(4), 261-8.

In superconducting magnetic levitation systems, interaction models between a high temperature superconductor and a permanent magnet are useful to analyze the dynamics of the levitated system. In this study, stiffness equations of a superconducting levitation system using a disk and a ring permanent are obtained using frozen image concept. The variation of the stiffness has been analyzed for vertical movements of the PMs. For engineering applications, accuracy of such models should be tested experimentally. An experimental PM-HTS setup has been built to verify the obtained models for different cooling height conditions. Levitation forces computed using the frozen image approach for the disk and ring PMs are converged to the experimental results when the cooling heights are smaller values.

16 illus, 2 table, 12 ref

015569   Banik S K;Bhuyan K (Physics Dep, Dibrugarh Univ, Dibrugarh-786 004, Email: kalyanbhuyan@gmail.com) : Dynamics of higher-dmiensional FRW cosmology in R<. Pramana J Phys 2017, 88(2), 41-51.

Authors study the cosmological dynamics for R^p exp(λR) gravity theory in the metric formalism, using dynamical systems approach. Considering higher-dimensional FRW geometries in case of an imperfect fluid which has two different scale factors in the normal and extra dimensions, we find the exact solutions, and study its behaviour and stability for both vacuum and matter cases. It is found that stable solutions corresponding to accelerated expansion at late times exist, which can describe the inflationary era of the Universe. We also - 48 - study the evolution of scale factors both in the normal and extra dimensions for different values of anisotropy parameter and the number of extra dimensions for such a scenario.

7 illus, 5 tables, 37 ref

015568   Balachandar S;Shivaprakash N C;Rao L K (Instrumentation and Applied Phusics Dep, Indian Institute of Science, Bengaluru-560 012, Email: opticsbalas@ipa.iisc.ernet.in) : Estimation of the thermal diffusivity of solids based on 'instantaneous velocimetry' using an interferometer. Pramana J Phys 2017, 88(3), 7-11.

A conceptually new approach is proposed to estimate the thermal diffusivity of optically transparent solids at ambient temperature based on the 'position-dependent instantaneous velocity' of isothermal surfaces using a self-reference interferometer. A new analytical model is proposed using the exact solution to relate the instantaneous velocity of isothermal surfaces with the thermal diffusivity of solids. The experiment involves setting up a one-dimensional non-stationary heat flow inside the solid via step-temperature excitation to launch a spectrum of dissimilar 'moving isothermal surfaces' at the origin. Moving isothermal surfaces exhibit macroscale 'rectilinear translatory motion'; the instantaneous velocity of any isothermal surface at any location in the heat affected region is unique and governed by the thermal diffusivity of the solids. The intensity pattern produced by the self-reference interferometer encodes the moving isothermal surfaces into the corresponding moving intensity points. The instantaneous velocities of the intensity points are measured. For a given thermo-optic coefficient, the corresponding values of the isothermal surfaces are predicted to estimate the thermal diffusivity of the solids using BK7 glass as an example. Another improved method is proposed in which thermal diffusivity is estimated without measuring thermo-optic coefficient and quartz glass is utilized as a specimen. The results obtained using the proposed approaches closely match with the literature value.

4 illus, 17 ref

015567   Bai G M C V;Agnes R N (Physics Dep, Rani Anna Government College for Women, Tirunelveli-627 008, Email: rcalvinsamuel@gmail.com) : Alpha decay and culster decay of some neutron-rich actinide nuclei. Pramana J Phys 2017, 88(3), 19-25.

Nuclei in the actinide region - 47 - are good in exhibiting cluster radioactivity. In the present work, the half-lives of aa-decay and heavy cluster emission from certain actinide nuclei have been calculated using cubic plus Yukawa plus exponential model (CYEMCYEM). Our model has a cubic potential for the overlapping region which is smoothly connected by a Yukawa plus exponential potential for the region after separation. The computed half-lives are compared with those of other theoretical models and are found to be in good agreement with each other. In this work, we have also studied the deformation effects on half-lives of cluster decay. These deformation effects lower the half-life values and it is also found that the neutron-rich parent nuclei slow down the cluster decay process. Geiger-Nuttal plots for various clusters are found to be linear and most of the emitted clusters are aa-like nuclei.

3 illus, 2 tables, 24 ref

015566   Aygun M (Physics Dep, Bitlis Eren Univ, 13000, Bitlis, Turkey, Email: murata.25@gmail.com) : Comparative analysis of the density distributions and the structure models of <. Pramana J Phys 2017, 88(3), 107-118.

In the present study, we have analysed the elastic scattering cross-section data of ⁹Li + ¹²C system at E_lab = 540 MeV and ⁹Li + ²⁰⁸Pb system at E_c.m. = 28.3 MeV for some cluster models and various density distributions of the ⁹Li nucleus. First, we have obtained five different density distributions of the ⁹Li nucleus to generate real potentials with the help of double-folding model. For these densities, we have calculated the elastic scattering angular distributions. Secondly, using a simple approach, we have investigated some cluster models of the ⁹Li nucleus consisting of ⁶He + ³H and ⁸Li + n systems. We have presented the comparison of elastic scattering angular distributions for each system with each other as well as with the experimental data. Finally, we have given the cross-section values obtained from the theoretical calculations for all the systems studied in this paper.

11 illus, 2 tables, 34 ref

015565   Atta A A;El-Nahass M M;Elsabawy K M;Raheem M M A El;Hassanien A M;Alhuthali A;Badawi A;Merazga A (Physics Dep, Faculty of Science, Taif Univ, Taif 888, Saudi Arabia, Email: aatta08@yahoo.com) : Optical characteristics of transparent samarium oxide thin films deposited by the radio-freauency sputtering technique. Pramana J Phys 2016, 87(5), 1-8.

Transparent metal oxide thin films of samarium oxide (Sm₂O₃) were prepared on pre-cleaned fused optically flat quartz substrates by radio-frequency (RF) sputtering technique. The as-deposited thin films were annealed at different temperatures (873, 973 and 1073 K) for 4 h in air under normal atmospheric pressure. The topological morphology of the film surface was characterized by using atomic force microscopy (AFM). The optical properties of the as-prepared and annealed thin films were studied using their reflectance and transmittance spectra at nearly normal incident light. The estimated direct optical band gap energy (E^d_g ) values were found to increase by increasing the annealing temperatures. The dispersion curves of the refractive index of Sm₂O₃ thin films were found to obey the single oscillator model.

38 ref

015564   Arora N;Joshi D P (Physics Dep, G B Pant Univ of Agriculture and Technology, Pantnagar-263 145, Email: arora.neha1287@gmail.com) : Thermodynamic study of nanometals for different shapes and sizes. Indian J pure appl Phys 2017, 55(4), 284-92.

Thermodynamic analytic model has been discussed to study the size as well as shape effect on thermodynamic parameters of nanometals. Thermodynamic properties like melting temperature, cohesive energy, vacancy formation energy and Debye temperature of Al, Ag, Au, In and Sn nano metals for spherical and non spherical nanoparticles (i.e. tetrahedral, hexahedral, octahedral and disc like) with different size have been studied. Present study shows that spherical and nonspherical nanoparticles behave in different manner due to the difference in their shape factor. It has - 46 - been found that these thermal properties show decreasing trend with decrement in size of the nanomaterial due to the change in surface to volume ratio. The obtained results also reveal that shape of the nanoparticle plays a vital role to affect the thermodynamic properties of small sized nanoparticles because of change in surface area with shape for fixed volume. Theoretical results obtained for melting temperature, cohesive energy, vacancy formation energy and Debye temperature have been discussed in the light of available simulated and experimental data which supports the validity of present model.

6 illus, 44 ref

015563   Arda A;Tezcan C;Sever R (Physics Education Dep, Hacettepe Univ, 06800, Ankara, Turkey, Email: arda@hacettepe.edu.tr ) : Thermodynamic quantities for the Klein-Gordon equation with a linear plus inverse-linear potential:Biconfluent Heun function. Pramana J Phys 2017, 88(2), 149-154.

Authors study some thermodynamic quantities for the Klein-Gordon equation with a linear plus inverselinear, scalar potential. We obtain the energy eigenvalues with the help of the quantization rule from the biconfluent Heun's equation.We use a method based on the Euler-MacLaurin formula to analytically compute thethermal functions by considering only the contribution of positive part of the spectrum to the partition function.

22 ref

015562   Amerian Z;Salem M K;Elahi A S;Ghoranneviss M (Plasma Physics Research Center, Science and Research Branch, Islamic Azad Univ, Tehran, Iran, Email: Salari_phy@yahoo.com) : Review on the solution of grad-shafranov equation in the cylindrical coordinates based on the chebyshev collocation technique. Pramana J Phys 2017, 88(3), 69-73.

Equilibrium reconstruction consists of identifying, from experimental measurements, a distribution of the plasma current density that satisfies the pressure balance constraint. Numerous methods exist to solve the Grad-Shafranov equation, describing the equilibrium of plasma confined by an axisymmetric magnetic field. In this paper, we have proposed a new numerical solution to the Grad-Shafranov equation (an axisymmetric,magnetic field transformed in cylindrical coordinates solved with the Chebyshev collocation method) when the source term (current density function) on the right-hand side is linear. The Chebyshev collocation method is a method for computing highly accurate numerical solutions of differential equations. We describe a circular crosssection of the tokamak and present numerical result of magnetic surfaces on the IR-T1 tokamak and then compare the results with an analytical solution.

^iia1 illus, 41 ref

015561   Ali A;Iqbal M A;Mohyud-Din S T (Mathematics Dep, Faculty of Sciences, HITEC Univ, Taxila, Pakistan, Email: ali.ayyaz@yahoo.com) : New analytical solutions for nonlinear physical models of the coupled higgs equation and the maccari system via rational exp(-ϕη))-expansion method. Pramana J Phys 2016, 87(5), 1-14.

In this article, a variety of solitary wave solutions are found for some nonlinear equations. In mathematical physics, we studied two complex systems, the Maccari system and the coupled Higgs field equation. We construct sufficient exact solutions for nonlinear evolution equations. To study travelling wave solutions, we used a fractional complex transform to convert the particular partial differential equation of fractional order into the corresponding partial differential equation and the rational exp(ϕη))-expansion method is implemented tofind exact solutions of nonlinear equation. We find hyperbolic, trigonometric, rational and exponential function solutions using the above equation. The results of various studies - 45 - show that the suggested method is very effectiveand can be used as an alternative for finding exact solutions of nonlinear equations in mathematical physics. A comparative study with the other methods gives validity to the technique and shows that the method providesadditional solutions. Graphical representations along with the numerical data reinforce the efficacy of the procedure used. The specified idea is very effective, pragmatic for partial differential equations of fractional order andcould be protracted to other physical phenomena.

16 illus, 38 ref

015560   Akbar N S;Butt A W;Tripathi D;Beg O A (DBS&H, CEME, National Univ of Sciences and Technology, Islamabad, Pakistan, Email: adil.maths86@gmail.com) : Physical hydrodynamic propulsion model study on creeping viscous flow through a ciliated porous tube. Pramana J Phys 2017, 88(3), 97-105.

The present investigation focusses on a mathematical study of creeping viscous flow induced by metachronal wave propagation in a horizontal ciliated tube containing porous media. Creeping flow limitations are imposed, i.e. inertial forces are small compared to viscous forces and therefore a very low Reynolds number (Re <60><60> 1) is taken into account. The wavelength of metachronal wave is also considered to be very large for cilia movement. The physical problem is linearized and exact solutions are developed for the differential equation problem. Mathematica software is used to compute and illustrate numerical results. The influence of slip parameter and Darcy number on velocity profile, pressure gradient and trapping of bolus are discussed with the aid of graphs. It is found that with increasing magnitude of the slip parameter, the trapped bolus inside the streamlines increases in size. The study is relevant to biological propulsion of medical micromachines in drug delivery.

5 illus, 35 ref

015559   Ajmi A;Majumder G (NO, Homi Bhabha National Institute, Anushaktinagar, Mumbai-400 094, Email: callalihere@gmail.com) : Inclusion of GENIE as neutrino event generator for INO ICAL. Pramana J Phys 2017, 88(3), 139-147.

The iron calorimeter (ICAL) detector is the proposed underground neutrino-physics experiment in the INO cavern. Its main goal is the determination of sign of 2-3 mass-squared difference, Δm²₃₂ (=m²₃-m²₂) in the presence of matter effects, apart from the precise measurement of other neutrino parameters. Like all other neutrino experiments, the INO Collaboration is going to interface its main software code with a neutrino event generator. The GENIE software is best suited for the ICAL experiment. But, it requires a fewmodifications before being incorporated in ICAL simulation to have better representation of the neutrino flux and to be more user friendly to the INO user. This paper reports all these modifications.

11 illus, 1 table, 22 ref

015558   Ahuja G;Sharma S;Arora G (Physics Dep, Faculty of Science, Pacific Academy of Higher Education and Research, Udaipur-313 022, Email: garora.gits@gmail.com) : Electron momentum density and band structure calculations of Dy₂O₃. Indian J pure appl Phys 2017, 55(8), 589-94.

The electronic properties of dysprosium sesquioxide have been investigated (Dy₂O₃) by employing the linear combination of atomic orbitals method within the framework of density functional theory. The energy bands, density of states, isotropic and anisotropic Compton profiles and Mulliken's populations of Dy₂O₃ have been computed. Theoretical anisotropies in Compton profile along [100], [110] and [111] directions have been explained in terms of energy bands. Results of the present calculations have been compared with previous experimental measurements and calculations.

4 illus, 4 tables, 35 ref

015557   Afify A A;El-Aziz M A (Mathematics Dep, Faculty of Science, Helwan Univ, P.O. Box 11795, Cairo, Egypt, Email: afify65@yahoo.com) : Lie group analysis of flow and heat transfer of non-newtonian nanofluid over a stretching surface with convective boundary condition. Pramana J Phys 2017, 88(2), 95-104.

The steady two-dimensional flow and heat transfer of a non-Newtonian power-law nanofluid over a stretching surface under convective boundary conditions and temperature-dependent fluid viscosity has been numerically investigated. The power-law rheology is adopted to describe non-Newtonian characteristics of the flow. Four different types of nanoparticles, namely copper (Cu), silver (Ag), alumina (Al₂O₃) and titanium oxide (TiO₂) are considered by using sodium alginate (SA) as the base non-Newtonian fluid. Lie symmetry group transformations are used to convert the boundary layer equations into non-linear ordinary differential equations. The transformed equations are solved numerically by using a shooting method with fourth-order Runge-Kutta integration scheme. The results show that the effect of viscosity on the heat transfer rate is remarkable only for relatively strong convective heating. Moreover, the skin friction coefficient and the rate of heat transfer increasewith an increase in Biot number.

15 illus, 2 tables, 49 ref

014597   Sriram J;Ramya;Sreeja K V;Priya L;Vasudevan K T (Physics Dep, GPGS, Jain Univ, Jayanagar 3rd Block, Bangalore-560 011) : Photoluminescence and quanching in polyaniline/ZnS nanocomposites. Archiv appl Sci Res 2016, 8(3), 38-45.

Nanocomposites of conducting polyaniline with ZnS nanoparticles (PAni/ZnS) have been synthesized by in- situ polymerization of aniline monomer using ammonium persulphate as oxidizing agent. The weight percentage of ZnS is varied from 1% to 28%. The formation of PAni/ZnS composites was assessed by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and UV-Vis spectroscopy. The broadening sharp peaks in the XRD patterns indicated the formation of nanocrystalline phase of ZnS with crystallite size of <126>5.3 nm. The FESEM image shows a nanoparticular structure of ZnS and it is also seen that the ZnS nanoparticles are well dispersed in the polyaniline matrix. UV-Vis spectrum of composites shows two peaks at 340 nm and a broad peak in the range <126>580 nm to 790 nm. The peak around <126>340 nm corresponds to excitation of electron from valence to conduction band, is used to determine the nature and value of the optical band gap of composites. Photoluminescence studies were carried out by exciting the samples with an excitation wavelength of 320 nm. Two peaks are observed at a wavelength of <126>365nm and 520 nm. The 365 nm emission is due to recombination of electrons at the sulphur vacancy donor level with holes trapped at the zinc acceptor level. The Peak at <126>520 nm with less intensity could be due to some self activated defect centres related to Zn vacancies. Thermal stability of the sample was analysed by Differential Scanning Calorimetry. DSC thermogram shows 2 endothermic peaks at 125° C and 260 °C. DC conductivity of PAni and its composites have been measured in the temperature range from 25°C to 205°C. It is found that conductivity increases with the increase of ZnS concentration.

7 illus, 34 ref

014596   Sahoo C;Sreeramulu V;Naraharisetty S R G;Rao D N (NO, School of Physics Univ of Hyderabad, Hyderabad-500 046, Email: dnr.laserlab@gmail.com) : ABCD matrix formalism to determine nonlinear refraction coefficient by Z-scan technique. Curr Sci 2017, 112(5), 1015-19.

In this study, we revisit the popular method of measuring the nonlinear susceptibility of a material through Z-scan technique, introduced in 1990 by Sheik-Bahae and co-workers through a simple ray optics defined by the ABCD matrix formulation. The work therefore looks at the Z-scan measurement curves analysed through ray propagation in the medium and analysed through an aperture. The transmittance of a sample in the Z-scan technique is measured through a finite aperture in the far field, as the sample is scanned along the propagation direction (Z) of a focussed Gaussian beam. The sign and magnitude of nonlinear refractive index are easily deduced from the transmittance curve (Z-scan) using the theoretical model based on ABCD matrix formalism.

6 illus, 14 ref

014595   Omaghali N E J;Obagboye L F;Howusu S X K (Physics Dep, Jos Univ, Jos, Nigeria) : Velocity and acceleration in elliptic cylindrical coordinates. Archiv appl Sci Res 2016, 8(3), 72-4.

In this paper, authors derive the expressions for the velocity and acceleration for bodies in Elliptic cylindrical coordinate systems. These expressions for the velocity and acceleration so derived can be applied in the formulation of Kinetic energy and Newton's equations of motion for a particle in a homogeneous elliptic cylinder.

5 ref

013508   Ramanathan G;Murali K R (Physics Dep, Sri Sairam Engineering College, Chennai-600 044, Email: gramsriram@gmail.com) : Effect of H₂ gas sensing performance of sol-gel dip coated In₂O₃ thin films. Rasayan J Chem 2017, 10(3), 700-6.

Using the sol-gel dip coating method In₂O₃ nanocrystalline thin films were prepared. Starting precursor was used as Indium (iii) chloride, acrylamide, N, N, bis methylene. As the prepared film was heated at a different temperature in the range of 350-500°C. The films were studied by using X-ray diffraction technique, Atomic force microscopy, and Energy dispersive X-ray analysis. The sensing ability of the samples with respect of H₂S gas rapidly but the recovery time was in the range of 34-91 second.

8 illus, 1 table, 16 ref

013507   Parimala M P D;Seshu Kumar M;Rao M C (NO, Physics Dep, Vijayawada-520 008, Email: raomc72@gmail.com) : Optical and electrical properties of Mn<. Rasayan J Chem 2017, 10(3), 825-31.

Mn²⁺ doped TiO₂ thin films were prepared by sol-gel method. Optical, ionic conductivity, photoluminescence and chromaticity studies have been carried-out on to the prepared samples. The UV-visible spectrum consists of four bands at 578, 529, 432 and 368 nm and is assigned to d-d transitions. The ionic conductivity plot revealed that the conduction takes place by the variation of temperature, which is due to the motion of charge carried in free space. The thermo emf of Mn²⁺ doped TiO₂ thin films increased with the increase of - 33 - temperature is due to conduction phenomenon from 275 to 325 K. Photoluminescence (PL) spectrum showed the emission peaks at 462, 513 and 582 nm wavelengths. The luminescence source of the material and its functional values can be determined by the color coordinates, which is found to be in orange and yellow regions.

5 illus, 1 table, 75 ref

013506   Koteswara Rao K;Rao M C (Krishna University, Physics Dep, Andhra Loyola College, Vijayawada-520 008, Email: raomc72@gmail.com) : Optical and luminescent properties of Ni<. Rasayan J Chem 2017, 10(3), 904-9.

Cadmium telluride is used for a variety of applications being a semiconductor material Ni²⁺ doped PVA capped CdTe nanoparticles were prepared by co-precipitation method. Several spectroscopic techniques have been carried out on to the prepared samples such as Optical, EPR, and Photoluminescence. The energy bandgap value is evaluated from optical studies. Optical absorption is due to vibrational bands of Nickel ion, Ni²⁺(d⁸) which give rise to ³F, ³P, ¹D in the wavelength region 400-800 nm. The violet and blue emission bands in the visible region are obtained from the PL studies.

5 illus, 1 table, 70 ref

013505   Kanakaraj M;Ramalingam H B (Physics Dep, Government Arts College, Udumalpet-642 126, Email: kanagarajbu@gmail.com) : Synthesis and characterization of Ni-Fe-S magnetic thin films at different bath temperatures. Rasayan J Chem 2017, 10(3), 744-50.

Electrodeposited alloy thin films Ni-Fe-S were prepared at temperatures 30, 50, 70 and 90°C. Electrodeposited Ni-Fe-S thin films were subjected to morphological, structural, magnetic and mechanical characterization analysis. The chemical Composition of the coated films was analyzed by EDAX and result shows that nickel content increases when bath temperature is increased. The surface and structural morphology of the coated film were analyzed by using SEM and XRD. The results show that thin films are bright, crack free and uniform. The mechanical characterization of Ni-Fe-S thin films have been analyzed by VHT and result shows that hardness increases when bath temperature is increased. The electroplated Ni-Fe-S thin films were strongly adherent to the copper substrate. All the electrodeposited Ni-Fe-S films exhibit FCC crystalline structure by XRD study. VSM result of Ni-Fe-S thin films shows that thin films coated at high bath temperature have highest saturation magnetization value.

5 illus, 5 tables, 25 ref

013504   Gorai S K;Parida G;Sharma A K (Postgraduate Department of Physics, Tata College, Kolhan University, Chaibasa, West Singbhum-833 201, Email: shreyagorai@gmail.com) : Empirical bulk modulus model of ternary chalcopyrite structure solids. Rasayan J Chem 2017, 10(3), 751-8.

Simple empirical relation has been proposed to estimate the bulk modulus (B) of ternary chalcopyrite structure solids of I-II-VI, II-IV-V type from the electronegativies of the constituent atoms and the principal quantum number of atoms of the compounds. The present relation is based on chemical bonding model. the electronegativity and principal quantum number determine the chemical bonding of constituent atoms of compounds. The chemical bonding of compounds is the starting point of the stability of compound which is based on the minimum energy principle. In the study, the ground state property like bulk modulus has been correlated with the nature of bonding of - 32 - materials. The combination of electronegativity and principal quantum number gives a good accout of bonding of ternary chalcopyrite structure solids. These two parameters provide a reliable guide to the structural stability of chalcopyrite structure solids. The compound values for bulk modulus are found to be good agreement with the known ones, the comparison between our present values and the ones in the literature is also given.

1 illus, 4 tables, 49 ref

013503   Adelene Prathyusha V;Punyaseshudu D (Physics Dep, Rayalaseema University, Kurnool-518 007, Email: dupaduphy@gmail.com ) : Spectroscopic investigations on Dy<. Rasayan J Chem 2017, 10(3), 881-90.

Deals with cadmium zinc phosphate glasses doped with different rare earth ions like Dy³⁺, Pr³⁺ and Sm³⁺. Optical absorption, emission, and excitation studies were carried out on these glasses at room temperature. All the corresponding rare earth doped glasses showed strong characteristic absorption bands from their ground states. Emission studies reveal that all these glasses exhibit visible emission for their respective excitation wavelengths. From these studies, it is found that the present host glass is suitable for while light emission as well as red emission. Therefore these Cd-Zn glasses are useful for lighting applications.

13 illus, 27 ref

013502   Adelene Prathyusha V;Punyaseshudu D (Physics Dep, Rayalaseema University, Kurnool-518 007, Email: dupaduphy@gmail.com ) : Effect of Lif on luminescence properties of Dy<. Rasayan J Chem 2017, 10(3), 771-7.

The present work deals with optical absorption, luminescence studies of the cadmium zinc phosphate glasses doped with Dy³⁺ ions. The effect of variation of LiF concentration in the host matrix cadmium-zinc phosphate glasses was established in this study. Optical absorption, luminescence studies reveals the emission of white light from the glass upon excitation. Characteristic nature of existence of Dy³⁺ ions in the host with absorption bands in absorption spectra, excitation and emission spectra with chromaticity coordinates in the white light region was described. These prepared glasses were useful in white light generation materials.

6 illus, 1 table, 20 ref

012534   Zheng G;Xu L;Liu Y (School of Physics and Optoelectronic Engineering, Nanjing Univ of Information Science & Technology, Nanjing 210044, Jiangsu, China, Email: jsnaophotonics@yahoo.com) : Tunable plasmonic filter with circular metal-insulator-metal ring resonator containing double narrow gaps. Pramana J Phys 2016, 86(5), 1091-7.

Tunable filter based on two metal-insulator-metal (MIM) waveguides coupled to each other by a ring resonator with double narrow gaps is designed and numerically investigated by finitedifference time-domain (FDTD) simulations. The propagating modes of surface plasmon polaritons (SPPs) are studied. By introducing narrow gaps in ring resonators, the transmission in - 53 - differentresonance modes can be effectively adjusted by changing the gap width (g), and the transmitted peak wavelength has a nonlinear relationship with g. Another structure consisting two cascading ring resonators and regular MIM waveguide have also been proposed. The mechanism based on circular ring resonators with narrow gaps may provide a novel method for designing all-opticalintegrated components in optical communication and computing.

6 illus, 1 table, 25 ref

012533   Zang X P;Yang M;Du C Q;Wang M;Fang S D;Cao Z L (Key Laboratory of Opto-Electronic Information Acquisition and Manipula, Ministry of Education, School of Physics & Material Science, Anhui Uni, Hefei 230601, People's Republic of China, Email: mingyang@ahu.edu.cn) : Transformation of bipartite non-maximally entangled states into a tripartite W state cavity QED. Pramana J Phys 2016, 86(5), 1009-19.

Authors were presented two schemes for transforming bipartite non-maximally entangled states into a W state in cavity QED system, by using highly detuned interactions and the resonant interactions between two-level atoms and a single-mode cavity field. A tri-atom W state can be generated by adjusting the interaction times between atoms and the cavity mode. These schemes demonstrate that two bipartite non-maximally entangled states can be merged into a maximally entangled W state. So the scheme can, in some sense, be regarded as an entanglement concentration process. The experimental feasibility of the schemes is also discussed.

4 illus, 36 ref

012532   Yulianti S I;Saputra D S (Physics Dep, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang (Unnes), 07 Building, 2nd Floor, Sekaran Campus, Gunungpati, Semarang, Republic of Indonesia, 50229, Email: sutiknomadnasri@mail.unnes.ac.id) : Investigation of pH effects on prpoerties of the fabricated banana flower extracts-based organic solar cell. Oriental J Chem 2017, 33(1), 318-23.

Purpose of this research is to fabricated banana flower extracts-based dye-sensitized solar cell (DSSC) using spin coating method. DSSC is made of photoactive material of banana extract by spincoating method and thermal evaporation, using indium tin oxide (ITO) substrate. Spincoater speed, coating duration and heating temperature are fixed as controlled variables, anthocyanin pH is fixed as independent variable, while optical and electrical properties of solar cell device are fixed as dependent variables. The anthocyanin content decreased as well as the pH increased and the voltage knee also increased. The pH enhance has caused the current generation of device decreased.

5 illus, 1 table, 13 ref

012531   Xie Q;Yan L;Wang L;Fu J (College of Physics and Electronic Engineering, Hainan Normal Univ, Haikou 571158, China, Email: qiongtaoxie@yahoo.com) : Analytical results for non-hermitian parity-time-symmetric and hermitian asymmetric volcano potentials. Pramana J Phys 2016, 86(5), 965-72.

Authors were investigated both the non-Hermitian parity-time-(PT-)symmetric and Hermitianasymmetric volcano potentials, and present the analytical solution in terms of the confluent Heun function. Under - 52 - certain special conditions, the confluent Heun function can be terminated as a polynomial, thereby leading to certain exact analytical results. It is found that the non-Hermitian PTsymmetric volcano potentials support the normalizable and non-normalizable reflectionless stateswith real energies. The Hermitian asymmetric volcano potentials allow normalizable reflectionless states with complex energies.

40 ref

012530   Xie A G;Xiao S Y;Wang L (School of Physics and Optoelectronic Engineering, Nanjing Univ of Information Science and Technology, Nanjing-210 044, Email: xagth@126.com) : Formulae for the secondary electron yield and total stopping power from 0.8 ke V to 10 keV for metals. Pramana J Phys 2016, 86(5), 1127-41.

Based on the range-energy relationship, the characteristics of secondary electron emission, some relationship between the secondary electron yield dd and experimental results, the universal formulae for δ_0.8-2 (the subscript indicates that the energy range of primary energy atthe surface W_po is from 0.8 keV to 2 keV) and δ2-10 for metals were deduced. The δ_0.8-10 calculated with the universal formulae and theδ_0.8-10 measured experimentally were compared, and the scattering of δ for the same metal was analysed. Finally, we concluded that the formulae were universal for δ_0.8 for metals. On the basis of some relationship between parameters of dd, wededuce a formula for expressing total stopping power S_0.8-10 S_10-30 as a function of S_10-30, δ_0.8-10, δ10-30backscattered coefficient η0.8-10, η10-30 and W_po. Thecalculatedpo. The calculated S_0.8-10 were compared with the values measured experimentally and it was concluded that the formula to estimate S_0.8-10 was universal for metals.

11 illus, 3 tables, 53 ref

012529   Varghese B;John M P;Nandakumaran V M (International School of Photonics, Cochin Univ of Science and Technology, Kochi-682 022, Email: bejoyrosily@gmail.com) : Delay signatures in the chaotic intensity output of a quantum dot laser with optical feedback. Pramana J Phys 2016, 86(5), 1021-30.

Delay identification from the chaotic intensity output of a quantum dot laser with optical feedback is done using numerical and information theoretic techniques. Four quantifiers, namely autocorrelation function, delayed mutual information, permutation entropy and permutation statistical complexity, are employed in delay estimation. A detailed comparison of these quantifiers with different feedback rates and delay is undertaken. Permutation entropy and permutation statistical complexity are calculated with different dimensions of symbolic reconstruction to obtain the best results.

4 illus, 14 ref