012528   Sharma J;Kumar S (Physics Dep, Chirst Church College, Kanpur-208 001, Email: shjyoti_06@yahoo.com) : Role of Ge incorporation in the physical and dielectric properties of Se₇₅Te₂₅ and Se₈₅Te₁₅ glassy alloys. Pramana J Phys 2016, 86(5), 1107-18.

The effect of Ge additive on the physical and dielectric properties of Se₇₅Te₂₅ and Se₈₅Te₁₅ glassy alloys has been investigated. It is inferred that on adding Ge, the physical propertiesi.e., average coordination number, average number of constraints and average heat of atomization increase but lone pair electrons, fraction of floppy modes, electronegativity, degree of crosslinking and deviation of stoichiometry (R) decrease. The effect of Ge doping on the dielectric propertiesof the bulk Se₇₅Te₂₅ and Se₈₅Te₁₅ glassy alloys has also been studied in the temperature range 300-350 K for different frequencies (1 kHz-5 MHz). It is found that, with doping, the dielectric constant ε' and dielectric loss ε" increase with increase in temperature and - 51 - decrease with increase in frequency. The role of the third element Ge, as an impurity in the two pure binary Se₇₅Te₂₅ and Se₈₅Te₁₅ glassy alloys has been discussed in terms of the nature of covalent bonding and electronegativity difference between the elements used in making the aforesaid glassy systems.

5 illus, 5 tables, 16 ref

012527   Schumacher M (Physikalisches Institut der Universitat Gottingen, Friedrich-Hund-Platz 1, D-37077 Gottingen, Germany, Email: mschuma3@gwdg.de) : Mass generation via the Higgs Boson and the quark condensate of the QCD vaccum. Pramana J Phys 2016, 87(3), 1-11.

The Higgs boson, recently discovered with a mass of 125.7 GeV is known to mediate the masses of elementary particles, but only 2%2% of the mass of the nucleon. Extending a previous investigation (Schumacher, {it Ann. Phys. (Berlin) } {f 526}, 215 (2014)) and including the strange-quark sector, hadron masses are derived from the quark condensate of the QCD vacuum and from the effects of the Higgs boson. These calculations include the pp meson, the nucleon and the scalar mesons σ(600), κ(800), a₀(980), f₀(980) and f₀(1370). The predicted second ss meson, σ'(1344)=|ss), is investigated and identified with the f₀(1370) meson. An outlook is given on the hyperons ,Σ^0,±, and S^0,-.

2 illus, 5 tables, 29 ref

012526   Richa;Tyagi A K;Singh D;Ahlawat (Physics Dep, I.K. Gujral Punjab Technical University, Jalandhar, Email: randeepkaur02@gmail.com) : Influence of pH variation on structural and magnetic properties of Ni-Zn ferrite nanoparticles synthesized by auto combustion method. Oriental J Chem 2017, 33(1), 296-303.

Nickel zinc ferrite (N_0.5Zn_0.5Fe₂O₄) nanoparticles were synthesized via solution auto ignition combustion method. The ferrite samples were synthesized with different pH values 3, 5, 7 and 8. The as synthesized samples were calcined at 800°C for 4 hours. These synthesized nanopowder have been characterized by XRD, SEM and VSM and effect of pH value on the properties of the ferrite samples were studied. XRD pattern confirmed that samples were crystalline in nature. Crystallite size of ferrite powder increased with increase in basic nature of ferrite nanoparticles. Crystallite size of sample was found 24.86nm, 28.10nm, 33.51nm and 39.61nm at pH value 3, 5, 7 and 8 respectively. The magnetization of samples prepared at different pH values 3, 5, 7 and 8 were found 55.490e.m.u, 61.420e.m.u/g, 65.541e.m.u/g and 66.512e.m.u./g respectively.

6 illus, 1 table, 50 ref

012525   Ray H (NO, Study Centre, S-1/407/6, B.P. Township, Kolkata-700 094, Email: hasi_ray@yahoo.com) : Collision between two ortho-positronium (Ps) atoms: a four-body coulomb problem. Pramana J Phys 2016, 86(5), 1077-90.

The elastic collision between two ortho-positronium (e.g. S=1S=1) atoms is studied using an {it ab-initio} static exchange model (SEM) in the centre of mass (CM) frame by considering the system as a four-body Coulomb problem where all the Coulomb interaction terms in the direct and exchange channels are treated exactly. A coupled channel methodology in momentum space is used to solve Lippman-Schwinger equation following the integral approach. A new SEM code is developed in which the Born-Oppenheimer (BO) scattering amplitude acts as input to derive the SEM amplitude adapting the partial wave analysis. The ss-, pp- and dd-wave elastic phase shifts and the corresponding partial cross-sections for the spin alignment S=0S=0, i.e., singlet (+) and S=2S=2, i.e., triplet (-) states are studied. An augmented Born approximation is used to includethe contribution of higher partial waves more accurately to determine the total/integrated elastic cross-section (σ)(s), the quenching cross-section (σ_q) and ortho-to-para conversion ratio (σ/σ_q)(s/sq). The effective range theory is used to determine the scattering lengths and effective ranges in the s-wave elastic scattering. The theory includes the non-adiabatic short-range effects due to exchange.

6 illus, 5 tables, 30 ref

012524   Panahi H;Mohammadkazemi Gavabar M (Physics Dep, Guilan Univ, Rasht 51335-1914, Iran, Email: t-panahi@guilan.ac.ir) : Application of quasiexactly solvable potential method to the N-body problem of anharmonic oscillators. Pramana J Phys 2016, 86(5), 985-96.

The quasiexactly solvable potential method is used to determine the energies and the corresponding exact eigenfunctions for a system of N particles with equal mass interacting via an anharmonic potential. For systems with five and seven particles, we compute the ground state and the first excited state only, and compare the spectrums with the results obtained by Ritz approximation method.

6 tables, 21 ref

012523   Naimuddin M D;Malhotra S (Physics and Astrophysics Dep, Delhi Univ, Delhi-110 007, Email: shivali.mahotra@cern.ch) : The model-independent analysis for Higgs Boson. Pramana J Phys 2016, 87(3), 1-6.

The discovery of a 125 GeV particle, announced by the ATLAS and CMS Collaborations on July 04, 2012, is one of the most important events in the recent history of particle physics. This particle could be the last missing particle of the Standard Model of particle physics or it could be the beginning of the long list of particles predicted by the physics beyond the Standard Model. Before we jump to make the final conclusion about this particle, it is imperative to study all the properties of this newly discovered particle. Since the model-dependentanalyses always have this danger of being biased, we can perform a model-independent search for the Higgs boson and also check if the 125 GeV particle is indeed the Standard Model Higgs boson or a particle belonging to the physics beyond the Standard Model.

2 illus, 40 ref

012522   Mishra A;Kaushal R S;Prasad A (Physics and Astrophysics Dep, Delhi Univ, Delhi-110 007, Email: nashmch@gmail.com) : Exact solution of certain nonlinear chemotaxis diffusion reaction equations. Pramana J Phys 2016, 86(5), 1043-53.

Using the auxiliary equation method, we obtain exact solutions of certain nonlinear chemotaxis diffusion reaction equations in the presence of a stimulant. In particular, we account for the nonlinearities arising not only from the density-dependent source terms contributed by the particles and the stimulant but also from the coupling term of the stimulant. In addition to this, the diffusion of the stimulant and the effect of long-range interactions are also accounted for in theconstructed coupled differential equations. The results obtained here could be useful in the studies of several biological systems and processes, e.g., in bacterial infection, chemotherapy, etc.

4 illus, 25 ref

012521   Mirzazadeh M (Engineering Sciences Dep, Faculty of Technology and Engineering, East of Guilan, Guilan Univ, P.C. 44891-63157, Rudsar-Vajargah, Iran, Email: mirzazadehs2@guilan.ac.ir) : Novel approach for solving fractional fisher equation using differential transform method. Pramana J Phys 2016, 86(5), 957-63.

In the present paper, an analytic solution of nonlinear fractional Fisher equation is deduced with the help of the powerful differential transform method (DTM). To illustrate the method, two examples have been prepared. The method for this equation has led to an exact solution. The reliability, simplicity and cost-effectiveness of the method are confirmed by applying this method on different forms of functional equations.

2 illus, 1 table, 15 ref

012520   Mathur S;Jain R;Sharma S K (Physics Dep, Jagan Gupta Institute of Engineering & Technology, Jaipur-302 022) : Preparation of mixed phase (Anatase/rutile) TiO₂ nanopowder by simple sol gel method. Int J latest Technol Engng Mgmt appl Sci 2017, 6(2), 25-7.

TiO₂ nanopowder having both anatase and rutile phases was prepared by a simple procedure using sol-gel method. Titanium isopropoxide was used as a titania source and mixed with methanol and TiO₂ nanopowder was obtained after annealing at 6000C for 1 hour in air. The specimens made from this powder were characterized by X-ray diffraction (XRD), Thermogravimetric analyzer (TGA) and Transmission electron microscopy (TEM). XRD studies revealed the presence of both anatase and rutile phases with an average crystallite size of 35 ± 5 nm. No significant weight loss up to 7000 C was observed by TGA curve which indicates that TiO₂ nanopowder is thermally stable. TEM revealed the presence of a number of crystalline grains in a structured matrix and selected electron diffraction pattern showed different arrangement of diffracted rings which confirms a phase evolution of crystalline grains of TiO₂ (anatase/rutile) due to thermal annealing. Mixed phase (anatase/rutile) TiO₂ nanopowder has been reported [1], [2] to exhibit improved photocatalytic and gas sensing properties. It is proposed to study the gas sensing behavior of these specimens during our research investigations on TiO₂ nanopowder.

3 illus, 9 ref

012519   Khanda A;Saha M;Chakrabarti T (ECE Dep, Heritage Institute of Technology, Kolkata) : Impact of defects and ambient temperature on the performance of HIT solar cell. Int J latest Technol Engng Mgmt appl Sci 2017, 6(4), 99-103.

Heterojunction with intrinsic thin layer or "HIT" solar cells are considered favorable for large-scale manufacturing of solar modules, as they combine the high efficiency of crystalline silicon c-Si solar cells, with the low cost of amorphous silicon technology. This article is based on the ambient temperature and the defects density in the Hetero-junction with Intrinsic Thin layers solar cells (HIT) strongly influences their performances. In this paper the structure: ITO/a-Si:H(p)/a-Si:H(i)/c-Si(n)/a-Si:H(n)/ITO is presented where we study the effect of the ambient temperature and the defects density in the gap of the crystalline Silicon layer and amorphous Silicon intrinsic layer on the performance of the heterojunction solar cell with intrinsic layer (HIT). The structure is simulated in AFORS-HET simulation software environment.

12 illus, 2 tables, 14 ref

012518   Khan S;Bakhtiar-UD-Din;Ilyas M;Wazir Z (National Centre for Physics, Quaid-Azam Univ Campus, Islamabad 45320, Pakistan, Email: sakhan@ncp.edu.pk) : Ion waves driven by shear flow in a relativistic degenerate astrophysical plasma. Pramana J Phys 2016, 86(5), 1143-51.

Authors investigate the existence and propagation of low-frequency (in comparison to ion cyclotron frequency) electrostatic ion waves in highly dense inhomogeneous astrophysical magnetoplasma comprising relativistic degenerate electrons and non-degenerate ions. The dispersion equation is obtained by Fourier analysis under mean-field quantum hydrodynamics approximationfor various limits of the ratio of rest mass energy to Fermi energy of electrons, relevant to ultrarelativistic, weakly-relativistic and non-relativistic regimes. It is found that the system admits an oscillatory instability under certain condition in the presence of velocity shear parallel to ambient magnetic field. The dispersive role of plasma density and magnetic field is also discussed parametrically in the scenario of dense and degenerate astrophysical plasmas.

3 illus, 30 ref

012517   Kaul R K (NO, The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai-600 113, Email: kaul@imsc.res.in) : Why supersymmetry? physics beyond the standard model. Pramana J Phys 2016, 87(3), 1-9.

The Naturalness Principle as a requirement that the heavy mass scales decouple from the physics of light mass scales is reviewed. In quantum field theories containing {em elementary} scalar fields, such as the StandardModel of electroweak interactions containing the Higgs particle, mass of the scalar field is not a natural parameter as it receives large radiative corrections. How supersymmetry solves this Naturalness Problem is outlined. Thereare also other contexts where the presence of elementary scalar fields generically spoils the high-low mass scales decoupling in the quantum theory. As an example of this, the non-decoupling of possible Planck scale violationof Lorentz invariance due to quantum gravity effects from the physics at low scales in theories with elementary scalar fields such as the Higgs field is described. Here again supersymmetry provides a mechanism for ensuringthat the decoupling of heavy-light mass scales is maintained.

2 illus, 15 ref

012516   Jeevarekha A;Philominathan P (PG and Research Dep of Physics, A.V.V.M. Sri Pushpam College, Poondi, Thanjavur-613 503, Email: philominathan@gmail.com) : Nonlinear approach to analyse the development of tropical disturbances. Pramana J Phys 2016, 86(5), 1031-42.

The development of atmospheric disturbances in the tropical region is explained using vibrational resonance, a nonlinear phenomenon. As the Lorenz system is the most plausible model to describe the convective process in a tropical region, the influence of vertical wind shear and tropical waves on the system leading to tropical cyclone has been investigated. The response of the convective region towards vertical wind shear and tropical waves is numerically studied. It was found that the response of the convective system decreases with the absence of any of these environmental factors. The dynamics of the system including resonance phenomenon is studied using phase portraits and Lyapunov dimension. Further, Lyapunov dimension is employed here to characterize the occurrence of resonant peaks.

10 illus,1 table, 32 ref

012515   Jaghouri H;Sarbishaei M;Javidan K (Physics Dep, Ferdowsi Univ of Mashhad, 91775-1436, Mashhad, Iran) : Evolution of entropy in different types of non-markovian three-level systems: single reservoir vs. two independent reservoirs. Pramana J Phys 2016, 86(5), 997-1008.

We solve the Nakajima-Zwanzig (NZ) non-Markovian master equation to study the dynamics of different types of three-level atomic systems interacting with bosonic Lorentzian reservoirs at zero temperature. Von Neumann entropy (S) is used to show the evolution of the degree of entanglement of the subsystems. The results presented are also compared with some recently published reports.

6 illus, 25 ref

012514   Gosai N N (Physics Dep, Matushri Virbaima Mahila Science & Home Science College, Rajkot, Gujarat) : Laser plasma accerlator (LPA)-design consideration. Int J appl Sci Engng Res 2017, 6(1), 24-33.

This review describes about particle accelerators and laser, especially a generation of intense laser pulses. For present-day light sources they are used to drive photo cathodes in high-brightness electron guns; to control and measure beam properties; and to seed the amplification process in the latest generation of light sources that rely on electron-beam-based free-electron lasers. Designs and considerations had been discussed. The electron beams generated today from laser plasma accelerators are approaching parameters that make their usage interesting for new applications. The use of advanced electron accelerators for linear colliders is most important. In this paper author discussed the possible use of an advanced LPA as injector for the LHeC. The application for the ring-ring option of the LHeC is indeed not fully excluded and could be used to demonstrate gains in size and cost with the new technologies, while developing them to full maturity for linear collider applications. Required R&D studies would involve the study of injection with ultra-short bunches into a storage ring.

^iia1 illus, 2 table, 15 ref

012513   Ghosh B (Centre for Advanced Studies, Physics Dep, The Univ of Burdwan, Burdwan-713 104, Email: bghosh@phys.buruniv.ac.in) : Electroweak phase transition and some related phenomena. Pramana J Phys 2016, 87(3), 1-6.

In this article, we give a bird's eye view of the research on electroweak phase transition and some related phenomena, viz., cosmological baryogenesis, electroweak bubble dynamics and generation of gravitationalwaves. Our presentation revolves around the observation that a strong first-order electroweak phase transition cannot be obtained in the Standard Model for experimentally favoured Higgs mass and hence the cosmologicalevents associated with this kind of phase transition cannot be explained in this model. However, this phase transition can be achieved in a number of beyond Standard Models. As a prototype case, we consider the littlest Higgs model with T parity and show the results of some - 46 - calculations within this model.

^iia8 illus, 61 rtef

012512   Gautam M S (School of Physics and Material Science, Thapar Univ, Patiala-147 004, Email: gautammanjeet@gmail.com) : Inelastic surface vibrations versus energy-dependent nucleus-nucleus potential in sub-barrier fusion dynamics of <. Pramana J Phys 2016, 86(5), 1067-76.

Limitations of the static Woods-Saxon potential and the applicability of the energy dependent Woods-Saxon potential (EDWSP) model within the framework of one-dimensional Wong formula to explore the sub-barrier fusion data are highlighted. The inelastic surface excitations of the fusing nuclei are found to be dominating in the enhancement of sub-barrier fusion excitation function data and the effects of such dominant vibrational states are exploited through the coupled channel calculations obtained by using the code CCFULL. It is worth mentioning here that the influence of multiphonon vibrational states of the reactants can be simulated by introducing the energy dependence in the nucleus-nucleus potential.

2 illus, 40 ref

012511   Falkowski A (Laboratorie de Physique Theorique, Bat. 201, Universite Paris-Sud, 91405 Orsay, France, Email: adam.falkowski@th.u-psud.fr) : Effective field theory approach to LHC higgs data. Pramana J Phys 2016, 87(3), 1-14.

The effective field theory approach to LHC Higgs data is reviewed.

2 tables, 140 ref

012510   Ermamatov M J;Yepez-Martinez H;Srivastava P C (NO, Institute of Nuclear Physics, Ulughbek, Tashkent 100214, Uzbekistan, Email: ermamat@inp.uz) : Bohr Hamiltonian with different mass parameters applied to band structures of Eu isotopes built on nilsson orbitals. Pramana J Phys 2016, 86(5), 1055-66.

The band structure of the proton-odd nuclei 153,155153,155Eu, built on Nilsson orbitals, is investigated within the framework of a recently developed extended Bohr Hamiltonian model. The relative distance between spherical orbitals is taken into account by considering single-particle energies as a parameter which changes with increasing neutron number. Energy levels of each band andB(E2)B(E2) values inside the ground-state band are calculated and compared with the available experimental data. Thus, more comprehensive information on the structure of deformed nuclei can be obtained by studying the rotation-vibration spectra of odd nuclei built on Nilsson single-particle orbitals.

4 illus, 2 tables, 43 ref

012509   Deka K;Kalita M P (Physics Dep, Gauhati Univ, Guwahati-781 014, Email: manoskalita@gmail.com) : Microstructure analysis of chemically synthesized wurtzite-type CdS nanocrystals. Pramana J Phys 2016, 86(5), 1119-26.

Microstructure of chemically synthesized wurtzite-type CdS nanocrystals have been investigated by X-ray diffraction (XRD) peak profile analysis by applying different forms of Williamson-Hall (WH) method viz., uniform deformation model (UDM), uniform stress deformation model (USDM) and uniform deformation energy density model (UDEDM), and transmission electron microscope (TEM) observations. The WH methods show the average crystallite size to beabout 10 nm. Strain, stress and energy density of the nanocrystals are found to be 1.18x10^-2,0.431.18x10-2,0.43 GPa and 2.272.27 kJ m^-3, respectively. High-resolution TEM (HRTEM) results show the nanocrystals to be in spherical shape with an average crystallite size of 10 nm, thereby complementing the size estimation by WH methods. Further, HRTEM observations reveal the presence of edge dislocations and twin boundaries within the nanocrystals.

4 illus, 1 table, 34 ref

012508   Das A S;Roy M;Roy D;Bhattacharya S (Electronics & Commmunication Dep, Swami Vivekananda Institute of Science & Technology, Dakshin Gobindapur, Kolkata-700 145) : DC electrical transport properties and non-aidabatic small polaron hopping conduction in semiconducting vanadate glasses. Int J latest Technol Engng Mgmt appl Sci 2017, 6(2), 11-19.

Transition metal oxide (TMO) doped semiconducting glass nano-composites xV₂O₅-(1-x) (0.05 MoO₃-0.95 ZnO), x = 0.3, 0.5, 0.7, 0.9 and 0.93 have been develop by conventional melt quenching technique. The temperature and compositional dependences of the dc electrical transport properties of as prepared vanadate glasses have been reported. Low and high temperature activation energy, density of states at Fermi level, optical phonon frequency and Debye temperature have been computed. Formation of small polaron has been confirmed from dc electrical conductivity experimental data and conductivity is due to mainly polaron hopping from V⁺⁴ to V⁺⁵ valence state in these glassy systems. The Schnakenberg's multiphonon assisted hopping model of small polaron is the best model to interpret the temperature dependence of the activation energy and the conductivity over the entire temperature range of measurement. The various polaron hopping parameters such as polaron radius, polaron band width (J), polaron hopping energy and the value of electron-phonon interaction coefficient (γ_P) have been evaluated. The estimated value of hopping carrier mobility (μ) and hopping carrier concentration (N_C) is found to depend on temperature and V₂O₅ content. According to Holstein, it is confirmed that non-adiabatic small polaron hopping is responsible for the electrical conductivity in presently studied glassy systems.

7 illus, 3 tables, 43 ref

012507   Chun E J (NO, Korea Institute for Advanced Study, 85 Hoegiro, Seoul 130-722, Korea, Email: ejchun@kias.re.kr) : The muon g-2 in two-Higgs-doublet models. Pramana J Phys 2016, 87(3), 1-9.

Updating various theoretical and experimental constraints on the four different types of two-Higgsdoublet models (2HDMs), we find that only the 'lepton-specific' (or 'type-X') 2HDM can explain the present muon g-2 anomaly in the parameter region of large tan β, a light CP-odd boson, and heavier CP-even and charged bosons which are almost degenerate. Severe constraints on the models come mainly from the consideration of vacuum stability and perturbativity, the - 44 - electroweak precision data, the b-quark observables like B_S → μμ, the precision measurements of the lepton universality as well as the 125 GeV boson property observed at the LHC.

7 illus, 3 tables, 19 ref

012506   Choudhury B S;Dhara A (Mathematics Dep, Indian Institute of Engineering Science and Technology, Shibpur, B. Garden, Shibpur, Howrah-711 103, Email: arpanbesu88@gmail.com) : Entanglement concentration protocol for cluster states using CNOT gate operation. Pramana J Phys 2016, 86(5), 973-83.

The purpose of this paper is a proposal on entanglement concentration protocol forcluster states. The protocol uses CNOT gate operation and is assisted with a single qubit. Moreover, the local and non-local operations are performed by a single party. We also make a comparative numerical study of the residual entanglement left out after the execution of each step of the protocol.

2 illus, 27 ref

012505   Chakraborty I;Kundu A (Physics Dep, Calcutta Univ, 92 Acharya Prafulla Chandra Road, Kolkata-700 009, Email: indrani300888@gmail.com) : Naturalness problem: off the beaten track. Pramana J Phys 2016, 87(3), 1-11.

Assuming that there is some symmetry which keeps the SM Higgs boson at the electroweak scale, we discuss the feasibility of some minimalistic expansions of the SM.

4 illus, 30 ref

012504   Chakraborty A;Ghosh D K (Theoretical Physics Dep, Tata Institute of Dundamental Research, 1, Homi Bhabha Road, Mumbai-400 005, Email: amit@theory.tifr.res.in) : CP-violating minimal supersymmetric standard model Higgs. Pramana J Phys 2016, 87(3), 1-17.

We discuss the present status of the Higgs sector of the CP-violating minimal supersymmetric Standard Model (CPVMSSM). In the Standard Model (SM) of particle physics, the only source of CP violation is the complex phase in the Cabibbo-Kobayashi-Maskawa (CKM) matrix. By now we all know that this singlephase is not large enough to explain the observed baryon asymmetry of our Universe. Hence, one require additional sources of CP violation. The MSSM with several complex phases is one such scenario. The tree-level CP invariance of the MSSM Higgs potential is broken at one-loop level in the presence of complex phases in the MSSM Lagrangian. The presence of these additional phases modifies Higgs masses, mixings and couplings significantly. These additional phases have non-trivial impact on several low-energy observables; like the electric dipole moments (EDMs) of atoms and molecules, the CP asymmetry in rare b-decays etc. We first present a brief outline of the CPVMSSM Higgs sector, and then discuss the current limits/bounds obtained from the measurementsof several low-energy observables. We also comment on the current bounds coming from the high-energy collider experiments, specially the Large Electron Positron (LEP) Collider and the ongoing Large Hadron Collider (LHC) at the CERN.

3 illus, 4 tables, 173 ref

012503   Bhattacharyya G;Das D (NO, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata-700 064, Email: gautam.bhattacharyya@saha.ac.in) : Scalar sector of two-Higgs-doublet models. Pramana J Phys 2016, 87(3), 1-13.

A vast literature on the theory and phenomenology of two-Higgs-doublet models (2HDM) exists since long. However, the present situation demands a revisit of some 2HDM properties. Now that a 125 GeV scalar resonance has been discovered at the LHC, with its couplings to other particles showing increasing affinity to the Standard Model Higgs-like behaviour, the 2HDM parameter space is more squeezed than ever. We briefly review the different parametrizations of the 2HDM potential and discuss the constraints on the parameter spacearising from the unitarity and stability of the potential together with constraints from the oblique electroweak T-parameter. We also differentiate the consequences of imposing a global continuous U(1) symmetry on thepotential from a discrete Z₂ symmetry.

^iia6 illus, 59 ref

012502   Bhattacharya S;Jain S (NO, Saha Institute of Nuclear Physics, 1/AF, Bidhan Nagar, Kolkata-700 064, Email: Shilni.Jain@cern.ch) : Discovery of SM-like higgs boson in H→γγ decay channel with the CMS detector at the LHC. Pramana J Phys 2016, 87(3), 1-30.

In this review we have outlined a very brief history of the Higgs boson search and the development of the strategies for searching for the Higgs boson in its diphoton decay channel. We have reviewed the methodology and tools that led to the first observation of the Higgs boson decaying to a pair of photons. We have presented the latest results from the measured properties of the newly found boson.We concentrate for most part on the analysis developed by the CMS experiment, but also present the latest results of the ATLAS experiment along with CMS results.

^iia32 illus, 2 tables, 70 ref

012501   Anjani Kumar;Dwivedi P K;Shukla P K;Kumar A (Physics Dep, Harcourt Butler Technological Institute, Kanpur-208 002, Email: dr_ashok_kumar@yahoo.com) : Comparative study of the density of defect states in bulk samples and thin films of glassy Se₉₀Sb₁₀. Pramana J Phys 2016, 86(5), 1099-1105.

The present paper reports the comparative study of density of defect states (DOS) between bulk samples and thin films of glassy Se9090Sb1010. These glasses have been prepared by the quenching technique. Thin films of these glasses have been prepared by vacuum evaporation technique. Space-charge-limited conduction (SCLC) has been measured at different temperatures.The density of localized states near Fermi level is calculated by fitting the data to the theory of SCLC for the case of uniform distribution of localized states for bulk as well as for thin films. A comparison has been made between the density of states calculated in these two cases.

7 illus, 1 table, 16 ref

011429   Singh G;Sandhu B S;Singh B (NO, Government Girls Senior Secondary School, Bharat Nagar, Ludhiana-141 001, Email: bhajan2k1@yahoo.co.in) : Experimental study of energy dependence of saturation thickness of multiply scattered gamma rays in zinc. Indian J pure appl Phys 2017, 55(5), 339-44.

The present measurements have been carried out to study the energy dependence of saturation thickness of multiply scattered gamma photons from zinc targets of various thicknesses. An inverse response matrix approach has been implemented to convert the observed pulse-height distribution of a NaI (Tl) scintillation detector to a photon spectrum and hence to improve the statistical error. These results in extractions of intensity distribution of multiply scattered events originating from interactions of 662 keV photon with thick target of zinc material. The observed pulse-height distributions are a composite of singly and multiply scattered events. To evaluate the contribution of multiply scattered events only, the spectrum of singly scattered events contributing to inelastic Compton peak has been reconstructed analytically. The scattered photons have been detected by a properly shielded NaI (Tl) gamma ray detector placed at different angle to the incident beam. The saturation thickness at which the number of multiply scattered events saturates has been measured. The signal-to-noise ratio and multiple scatter fractions have been found to be decreasing with increasing target thickness. The self-absorption correction factor improves the multiply scattered photon intensity but not the saturation thickness. The same experiment has been repeated with HPGe detector at 90° scattering angle. The results obtained with NaI (Tl) and HPGe detector show the same trend. The experimental results have been found to support the Monte Carlo calculations.

8 illus, 17 ref

011428   Rajasekar M;Ramasamy G;Meenakshisundaram S P (Chemistry Dep, Annamalai Univ, Annamalainagar-608 002, Email: aumats2009@gmail.com) : Pd(II)-doping studies on tris(thiourea)zinc(II) sulphate crystals: catalytic effect of Pd(II)-doping on SHG efficiency. Indian J pure appl Phys 2017, 55(5), 372-6 .

Single crystals of Pd(II)-doped tris(thiourea)zinc(II) sulphate (ZTS) have been grown from an aqueous solution by conventional slow evaporation solution growth technique. The characteristic functional groups have been identified by FTIR analysis. Crystal stress has been indicated by powder XRD patterns and FTIR analysis. Incorporation of dopant into the crystalline matrix during crystallization process has been evidenced by energy dispersive X-ray spectroscopy and quantified by inductively coupled plasma technique. The surface morphological changes have been observed in the doped specimen. Mechanical stability of the as-grown specimen has been analyzed by Vickers microhardness analysis. Thermal studies reveal no decomposition up to the melting point. Lattice parameters determined by single crystal XRD analysis reveal only minor variations as a result of low doping. Pd(II) doping has a catalytic effect on the second harmonic generation efficiency improvement of zinc thiourea complex.

8 illus, 3 tables, 35 ref

011427   Maragani N;Vijaya Kumar K;Krishna Jyothi N ( Solid State Ionics Research Laboratory, Physics Dep, K.L. Univ, Guntur-522 502, Email: narsigoud@gmail.com) : AC conductivity and thermal studies of PAN-NaF doped gel polymer electrolytes for solid state battery applications. Rasayan J Chem 2017, 10(2), 665-72.

Thin film membranes of poly acrylonitrile (PAN) doped with sodium Fluoride (NaF) was prepared by solution casting technique. The Gel polymer Electrolyte films exhibiting an average thickness of 142 μm. The films were prepared with different (wt %) ratios. The structural formations were analyzed by X-Ray Diffraction method (XRD).The Conductivity Studies (AC) and thermal conductivity studies (DSC) of the different ratios of gel polymer electrolyte composites were studied. The AC conductivity studies were determined from the impedance data and thermal conductivity studies were measured using the transient electric pulse method. The AC Conductivity increases with increasing temperature and NaF Concentration. The formed fluoride complexes also contribute in increasing the AC quantities. The DSC measurements showed a decrease in the degree of crystallinity and increase of amorphous regions with increasing concentration of salt NaF. The sample containing 70PAN:30NaF exhibited the maximum conductivity of 1.82 x 10^-4 S cm^-1 at room temperature (303K) and 2.96 x 10^-3 S cm^-1 at 373K.

6 illus, 2 tables, 35 ref

011426   Liu Q;Chen L R (School of Physics and Material Science, Anhui Univ, Hefei-230 601, Email: quanliu@ahu.edu.cn) : Pressure dependence of the gruneisen parameter and thermal expansion coefficient of solids. Indian J pure appl Phys 2017, 55(5), 368-71.

Following the assumption of Jeanloz and Anderson, a computing model for the pressure dependence of the Gruneisen parameter and the thermal expansion coefficient has been proposed. Applying them to alkali metals and NaCl in different pressure ranges, the calculated results are found in good agreement with the experimental data. Finally, the flaw appears in other literatures have been corrected in this study.

5 tables, 30 ref

011425   Lakshmi K;Shahenoor Basha S K;Rao M C ( Physics Dep, Krishna Univ, Andhra Loyola College, Vijayawada-520 008, Email: raomc72@gmail.com) : Optical and photoluminescent studies on VO< . Rasayan J Chem 2017, 10(2), 682-8.

VO²⁺ doped SnO₂ thin films have been prepared on ultra-clean glass substrates by chemical spray pyrolysis technique. UV-vis, PL, Electrical conductivity and chromaticity studies were investigated on VO²⁺ doped SnO₂ thin films. Optical absorption spectrum showed three bands at 753, 720 and 610 nm in the wavelength range 300-800 nm. DC electrical conductivity studies revealed that large value of thermoelectric power of VO²⁺ doped SnO₂thin films possess semiconductor behaviour. The thermo emf of VO²⁺ doped SnO₂ thin films was studied in the temperature range 275 - 325 K using thermal probe method. Photoluminescence spectrum showed that the optical bands lie at 352 and 436 nm. The CIE (x, y)chromaticity is calculated from the emission spectrum and the coordinates were found for VO²⁺ doped SnO₂ thin films at (x = 0.2993, y = 0.4912) showed in blue and yellow regions.

3 illus, 1 table, 69 ref

011424   Inbakumar S;Andavan P M (R&D Center, Bharathiar Univ, Coimbatore, Tamilnadu, Email: s.inbakumar@gmail.com) : Structural and optical analysis of plasma exposed and annealed Sb₂S₃ thin film. Rasayan J Chem 2017, 10(2), 507-12.

Sb₂S₃ thin films were prepared by thermal evaporation method. The film thickness was measured using a quartz crystal thickness monitor in the coating unit. In the present work thin films are exposed to glow discharge plasma for various time intervals at pressure 0.2mb, breakdown voltage 350 V and electrode distance 3 cm. The films were also annealed at 250°C for 2hrs. Plasma exposed and annealed Sb₂S₃ thin films were characterized and studied by XRD analysis and optical analysis. The as-deposited films were amorphous, while the plasma treated and annealed films have an orthorhombic microcrystalline structure.

4 illus, 1 tabkle, 14 ref

011423   Goyal P;Gurjit Kaur (School of Information and Communication Technology, Gautam Buddha Univ, Greater Noida-201 308, Email: pri_228@yahoo.co.in) : Performance of silicon micro ring modulator with an interleaved p-n junction for optical for optical interconnects. Indian J pure appl Phys 2017, 55(5), 363-7 .

Silicon micro ring modulators are critical components in optical on-chip communications. The performance of an interleaved p-n junction micro ring modulator using FDTD solutions has been characterized. In this paper, the model and simulation of a modulator utilizing an interleaved junction with a SiO₂ layer with a thickness of 10 μm have been presented. It is demonstrated that a loss of 34.7 dB/cm occurs during transmission. The modulator operates at 1.55 μm wavelength with a VpL of 0.78 V-cm at a voltage of 1 V, which gives figure of merit.

13 illus, 5 ref

011422   Gareso P L;Buda M;Tan H H;Jagadish C ( Physics Dep, Faculty of Mathematics and Natural Sciences, Hasanuddin Univ, Makassar-90245, Indonesia, Email: pgareso@gmail.com) : Effect of rapid thermal annealing to device performance of InGaAs/AkGaAs quantum well laser diodes. Indian J pure appl Phys 2017, 55(5), 333-8.

The effect of rapid thermal annealing to device performance of InGaAs/AlGaAs quantum well laser diode has been investigated using photoluminescence (PL), double-crystal X-ray diffraction (DCXRD), photo-response (PR) and lasing characteristic. X-ray measurement results show that there is an incorporation of carbon atom in lattice site of higly doped p⁺⁺ GaAs contact layer. The photocurrent spectra at room temperature reveal that the relative intensity of 1e-1hh transition of annealed samples is much higher than that of as-grown samples and the peak became narrow. Stark shifts are much higher for the samples after annealing in comparison to the as-grown samples and this has been attributed to a decrease of the confining potential due to thermal interdiffusion. Characteristic of laser diodes shows that there is no significant degradation of lasing parameters after annealing has been observed and it has been found that the threshold current of annealed laser diodes are approximately four times less than as-grown laser diodes and this has been attributed to the electrical activation of carbon.

6 illus, 1 table, 20 ref

011421   Bhardwaj V;Singh V K (Applied Physics Dep, Indian Institute of Technology (Indian School of Mines), Dhanbad-826 004, Email: singh.vk.ap@ismdhanbad.ac.in) : Optical fiber cone taper tip sensor for refractive index meaurement. Indian J pure appl Phys 2017, 55(5), 345-8.

Optical fiber cone taper (OFCT) tip for refractive index sensing based on Michelson interferometer (MI) has been reported in present work. The fiber tip has been fabricated using chemical etching techniques, where hydrofluoric acid (HF) has been used as chemical etchant and silicone oil as protective layer for single mode fiber. The variation between intensity and refractive indices have been studied for small volume of liquid at operating wavelength 1550 nm and 1310 nm. In addition OFCT tips have been tested for pH detection and time response. The refractive index sensitivity of 9878.28 dB RIU^-1 has been observed for sodium chloride (NaCl) solution in water of refractive index range from 1.3330 to 1.3342. Such kind of sensors using optical fiber tips are of low cost, simple fabrication and compact structure with high sensitivity.

8 illus, 26 ref

011420   Bhandari S;Agrawal V V;Birader A M ( Electronics and Communication Dep, Maharana Pratap Univ of Agriculture & Technology, Udaipur-313 001, Email: ved.varun@gmail.com) : Fiber optics based surface plasmon resonance for label-free optical sensing. Indian J pure appl Phys 2017, 55(5), 349-62.

With the advancement in the laser technology and availability of low cost optical fibers, there is an increasing trend towards adoption of optical fibers as sensing element for development of optical sensors probes especially point-of-care sensing for environmental, biomedical and clinical application. Refractive index measurement through surface plasmon resonance has evolved to be, one of the most sensitive transducer for label-free sensing with high sensitivity. Surface plasmon resonance is a surface sensitive optoelectronic phenomenon, where light incident on a plasmonic metal surface at a given angle can excite a surface-bound electromagnetic wave, a surface plasmon. Associated with the surface plasmon is an evanescent field that probes local changes in the refractive index of the ambient medium that are used for monitoring analyte- supramolecular/ bio-molecular ligand interactions. Present review outlines a concise view on theoretical aspects of fiber optics based surface plasmon resonance phenomenon and comprehensive updated review on research and development for progression in the design of fiber optics based SPR sensors.

5 illus, 1 table, 123 ref

010458   Al-Ghamdi H;Al-Muqrin A (Princess Nourah Univ, College of Science, Physics Dep, Riyadh, KSA, Email: hmalghmdi@Pnu.edu.sa) : Radium activity levels in groundwater in Saudi Arabia, and relationship with some water chemical constituents. Biosci Biotechnol Res Asia 2016, 13(3), 1327-32.

The purpose of this study was to determine the activity concentrations of radium isotopes (²²⁶Ra and ²²⁸Ra) in groundwaters from some selected wells in Saudi Arabia. These wells are located in different regions of Saudi Arabia. The relationship between the activity concentration of radium and the water chemical compositionin the investigated wells was also investigated.The radium isotopes were measured by gamma spectrometry using high purity germanium detector,after radiochemical separation of the isotopes with ion-exchange chromatography using a strong cation resin. The mean activity concentration of ²²⁶Ra was 9.7 pCi/L and for ²²⁸Ra, it was 9.8 pCi/L. A relatively higher values of radium activities were found in Qaseem, Al Jawf and Tabouk. The ²²⁸Ra/²²⁶Ra activity ratio had an average value of 1.2. The chemical analyses showed thatgood correlationshave been observed between the radium activities and the total dissolved soilds and dissolved oxygen inthe investigated groundwaters. Most of the analyzed groundwater samples were below the maximum contaminant level of the combined radium (²²⁶Ra and ²²⁸Ra)proposed by EPA for drinking water. The data obtained from the activity concentrations of the investigatedradium isotopes are comparable to the results reported in literature for radium in the Kingdom of Saudi Arabia, and can be used to establish a radiological baseline radioactivity map for radium radioactivity levels in groundwater of these regions.

11 illus, 12 ref

009424   Vetrivel V;Rajendran K;Senthil T S; Sarthikeyan K (Electronics & Communication Systems Dep, Sri Krishna Arts & Science College, Coimbatore-641 008, Email: 2vetrivel@gmail.com) : Structural and optical characteristics of anatase and rutile titania thin films by solvo-thermal doctor blade method. Asian J Chem 2017, 29(1), 4-8.

In present work, titania nanocrystal thin films were synthesized by using titanium(IV) isopropoxide as precursor and isopropyl alcohol as solvent. The precursor and solvent ratio were controlled to bring out the sol-gel. Triton X-100 was used to form titania paste and coated in FTO substrate by doctor blade method. The characteristic studies were carried out for the as-prepared sample, annealed at 450 °C and washed with HCl. The X-ray diffraction pattern revealed that anatase to rutile phase transformation for the as-prepared sample to the samples annealed at 450 °C and HCl washed. It also confirms the crystalline size of all the samples in nanoscale with average grain size of 5.71 nm and 18.76 nm. Scanning electron microscopy photograph confirms the presence of nanoparticles. The energy dispersive X-ray shows the prepared samples are titanium oxide without any impurity. The ultra violet-visual absorption study shows that the band gap of titania decrease with increase in annealing and HCl wash. Fourier transform infrared spectrum confirms the formation of titania.

1 illus, 4 tables, 25 ref

008366   Tahir M B;Rafique M;Shahid Rafique M;Iqbal T; Nabi G (Physics Dep, Gujrat Univ, Gujrat, Pakistan, Email: m.bilaltahir@uog.edu.pk) : Electron emission characterization of laser-induced gaseous plasma. Indian J pure appl Phys 2017, 55(2), 145-54.

Laser induced hydrogen plasma has been investigated as a source of electrons. The energy, temperature and flux of the electrons have been determined by using two different temporal detectors; Faraday cup and Rogowski coil. The energy, temperature and flux were measured from the electrons extracted from laser induced hydrogen plasma. The Rogowski coil has been used for measurement of flux and current whereas Faraday cup has been used to determine the current density in laser induced plasma. The energy and temperature of the electrons are measured by the time of flight method in the range of 1.23 - 5.04 keV and 2516.26 eV, respectively. The flux of the electrons has been measured ≈ 10^{15 by Rogowski coil and the maximum current has been measured to be 39.6 kA. The current density has been measured by the Faraday cup ranges from 20 Am-2 to 23 Am-2.}

11 illus, 4 tables, 28 ref

008365   Soni K K;Maheshwari K P;Jaiman N K (Pure & Applied Physics Dep, Kota Univ, Kota-324 005, Email: sonikrishna1490@gmail.com) : Analytical and numerical investigation of the brightness of high power X- and gamma rays as a result of intense laser interacting with plasma mirrors in radiation pressure regime. Indian J pure appl Phys 2017, 55(2), 104-12.

At laser intensity in the range <126> 10^{22 - 1023 W/cm2, the radiation pressure starts to play a key role in the interaction of an intense electromagnetic wave with a dense plasma foil. In this radiation pressure dominant regime (RPD regime) we present our numerical results for the frequency and brightness of the reflected radiation from a uniformly moving plasma mirror. The interaction of the electromagnetic wave with an approaching plasma mirror results in the Doppler-shifted reflected radiation. The reflected photon frequency lies in the hard X-ray or gamma-ray range. For the source pulse energy ε_s = 12 J, λ_s = λ = 0.8 μ m, n_e = 480 n_cr = 5.4 x 1023 cm-3 x (1μ m/λ)2, there are approximately 9.6 x 1042 hard X-ray photons/ (mm2-mrad2 -s.-0.1% bandwidth) in the energy range <126> 10 keV. In the case when 2γ <62> (n_eλ_s3)1/6 for the same parameters of source laser pulse and driver pulse normalized vector potential a_d = 300, λ_d = 0.8 μm the brightness is found to be 3.9 x 1034 photons/(mm2 - mrad2 - s. - 0.1% bandwidth) in the energy range <126>100 keV. These radiations have broad range of applications in many areas of research e.g. medicine and material science.}

13 illus, 22 ref

008364   Singh S;Park S H (Electronic Engineering Dep, Yenugnam Univ, Gyeongbuk 38541, Republic of Korea, Email: shivi.phy@gmail.com) : Comparative study of characteristics of AZO based MISIM photodetectors with Al₂O₃ and SiO₂ passivation layers. Indian J pure appl Phys 2017, 55(3), 193-7.

This paper reports aluminum (Al) doped zinc oxide (AZO) based metal-insulator-semiconductor-insulator-metal (MISIM) ultraviolet (U) photodetectors. Spray-coated Al₂O₃ and sputtered SiO₂ have been used as passivation-layer for two different sets of MISIM devices, respectively. The spray-coated Al₂O₃ passivation-layer has been used first-time for AZO based MISIM U-photodetectors. A comparative study of current versus voltage characteristics of MISIM and MSM (without passivation-layer) devices have been done systematically. The MISIM devices with Al₂O₃ passivation-layer showed better performance than MSM and MISIM (with SiO₂) U-photodetectors. These AZO based MISIM (with spray-coated Al₂O₃) U-photodetectors can be used for low-cost optoelectronic applications.

7 illus, 2 tables, 24 ref

008363   Singh J;Kumaraswamidhas L A;Vijay A;Ashok Kumar;Sharma N D (Pressure & Vacuum Standards, CSIR-National Physical Laboratory, New Delhi-110 012, Email: ndilawar@nplindia.org) : Estimation of uncertainty of effective area of a pneumatic pressure reference standard using Monte Carlo method. Indian J pure appl Phys 2016, 54(12), 755-64.

The current paper presents a comparative investigation of the experimental as well as simulated evaluation of effective area and the associated uncertainties, of a pneumatic pressure reference standard (NPLI-4) of CSIR-National Physical Laboratory, India, (NPLI). The experimental evaluation has been compared to the simulated estimation of the effective area obtained through Monte Carlo method (MCM). The Monte Carlo method has been applied by taking fixed number of trials (FMCM) and also by trials chosen adaptively (AMCM). The measurement uncertainties have been calculated using the conventional method, i.e., law of propagation of uncertainty (LPU) as well as MCM. Experimentally, the NPLI-4 has cross-floated against our newly established pneumatic primary pressure standard (NPLI-P10), which is a large diameter piston gauge. An excellent agreement in effective area and measurement uncertainty has been observed between these approaches.

7 illus, 6 tables, 17 ref

008362   Singh G;Balwinder Raj;Sarin R K (NO, Centre for Development of Advanced Computing (C-DAC), Mohali-160 071, Email: gurmohan@cdac.in) : Design and performance analysis of a new efficient coplanar quantu-dot cellular automata adder. Indian J pure appl Phys 2017, 55(2), 97-103.

Quantum-dot cellular automata (QCA) nanotechnology has the potential for revolutionizing the way computers are used. QCA computing has numerous advantages of ultra-low energy dissipation, improved performance and high device density. An adder is the most elementary component in arithmetic units of processors. Lot of work has been in progress to design and implement efficient adder circuits in QCA nanotechnology. This paper presents design and performance analysis of a new efficient coplanar adder in QCA nanotechnology. The proposed adder design uses 20% less QCA cells as compared to previous similar design due to better arrangement of QCA cells in the layout and has a delay of 1 clock cycle with an area of 0.04 μm^{2. The proposed adder has 19% less average leakage energy dissipation, 28% less average switching energy dissipation, and 25% less average energy dissipation than the best reported previous coplanar adder design. The cost function of proposed efficient adder is equal to best reported previous coplanar adder.}

10 illus, 2 tables, 32 ref

008361   Shrestha R;Subedi D P;Tyata R B;Wong C S (Natural Science Dep, Kathmandu Univ, Kathmandu 6250, Nepal, Email: rajendra.ts2002@gmail.com) : Generation and diagnostics of atmospheric pressure dielectric barrier discharge in argon/air. Indian J pure appl Phys 2017, 55(2), 155-62.

In this paper, a technique for the determination of electron temperatures and electron densities in atmospheric pressure argon/air discharge by the analysis of optical emission spectra (OES) is reported. The discharge is produced using a high voltage (0-20 kV) power supply operating at a frequency of 27 kHz in parallel electrode system, with glass as dielectric. The dielectric layers covering the electrodes act as current limiters and prevent the transition to an arc discharge. Optical emission spectra in the range of 300 nm to 850 nm have been recorded for the discharge with different inter electrode gap keeping electric field constant. Electron temperature T_e and electron density n_e have been estimated from electrical and optical methods. Electron density has been calculated using power balance method. The optical methods are related with line intensity ratio from the relative intensities of Ar-I and Ar-II lines in Argon plasma. The electron density calculated by using line intensity ratio method has been compared with the electron density calculated by stark broadening method. The effect of dielectric thickness on plasma parameters has also been studied and it has been found that T_e and n_e increase as thickness of dielectric decrease for same inter electrode distance and applied voltage.

15 illus, 1 table, 21 ref

008360   Sharma S K (NO, Shivalik Institute of Engineering and Technology, Ambala-133 206, Email: sav31@rediffmail.com) : Anharmonicity in isochoric heat capacity for Mg₂SiO₄. Indian J pure appl Phys 2016, 54(12), 787-82.

An expression has been formulated to find the values of volume dependence of isochoric heat capacity (C_V). It is employed on Mg₂SiO₄. It has been found that isochoric heat capacity decreases strongly with increase in compression or pressure. Anharmonicity on C_V for solid under present investigation has been seen above 1500 K under low compression. However, at low temperature, for both low and high compression, and at high temperature under high compression, quasi-harmonic effects are visible. Under high compression, beyond 1200 K the C_V increases slowly monotonically with the temperature. It attains peak value at/around Debye temperature. With increasing compression, the curves become steeper. At high temperatures, C_V under high compressions depart from that estimated by the Dulong-Petit theory.

2 illus, 1 table, 60 ref

008359   Shaaban I (Nuclear Engineering Dep, Atomic Energy Commission, Damascus 6091, Syria, Email: pscientific3@aec.org.sy) : Conceptual design of a thermal neutron radiography facility in the cyclotron 30 LC using the MCNPX code. Indian J pure appl Phys 2017, 55(2), 135-44.

The MCNPX code and the ENDF/B-VII cross-section library have been used to optimize the geometrical dimensions of the thermal neutron radiography facility (TNRF) based on the cyclotron 30 LC using a Be target as a neutron source and the Protons Beam Channel (PBC) with energy 15.0 MeV and 20.0 MeV. Thermal, epithermal and fast neutron energy ranges have been selected as <60> 0.4 eV, 0.4 eV-10 keV and <62>10 keV, respectively. The calculated values of the thermal neutron flux at the main collimator exit (MCE) have been estimated to be 1.31'10^{5 n/cm2.s and 1.05'105 n/cm2.s, 1.97'105 n/cm2.s and 1.66'105 n/cm2.s for the ratio L/D = 90 and L/D = 110, and the PBC with energy 15.0 MeV and 20.0 MeV, respectively. In addition, the cooling system of the Be target has been designed using solid works program. The simulated results showed that the maximum temperature of the Be target is lower than the melting temperature of the Be target. The use of neutronic and gamma filters has been eliminated in the design phase reducing the economic cost had anyone thought to build this beam.}

13 illus, 5 tables, 17 ref

008358   Sayyed S A A R;Beedri N I;Kadam V S;Pathan H M (Physics Dep, Savitribai Phule Pune Univ, Pune-411 007, Email: pathan@physics.unipune.ac.in) : Rose bengal-sensitized nanocrystalline ceria photoanode for dye-sensitized solar cell application. Bull Mater Sci 2016, 39(6), 1381-7.

For efficient charge injection and transportation, wide bandgap nanostructured metal oxide semiconductors with dye adsorption surface and higher electron mobility are essential properties for photoanode in dyesensitizedsolar cells (DSSCs). TiO₂-based DSSCs are well established and so far have demonstrated maximum power conversion efficiency when sensitized with ruthenium-based dyes. Quest for new materials and/or methods is continuous process in scientific investigation, for getting desired comparative results. The conduction band (CB) position of CeO₂ photoanode lies below lowest unoccupied molecular orbital level (LUMO) of rose bengal (RB) dye.Due to this, faster electron transfer from LUMO level of RB dye to CB of CeO₂ is facilitated. Recombination rate of electrons is less in CeO₂ photoanode than that of TiO₂ photoanode. Hence, the lifetime of electrons is more in CeO₂ photoanode. Therefore, we have replaced TiO₂ by ceria (CeO₂) and expensive ruthenium-based dye by a low cost RB dye. In this study, we have synthesized CeO₂ nanoparticles. X-ray diffraction (XRD) analysis confirms the formation of CeO₂ with particle size <126>7 nm by Scherrer formula. The bandgap of 2.93 eV is calculated using UV-visibleabsorption data. The scanning electron microscopy (SEM) images show formation of porous structure of photoanode, which is useful for dye adsorption. The energy dispersive spectroscopy is in confirmation with XRD results,confirming the presence of Ce and O in the ratio of 1:2. UV-visible absorption under diffused reflectance spectra of dye-loaded photoanode confirms the successful dye loading. UV-visible transmission spectrum of CeO₂ photoanodeconfirms the transparency of photoanode in visible region. The electrochemical impedance spectroscopy analysis confirms less recombination rate and more electron lifetime in RB-sensitized CeO₂ than TiO₂ photoanode. We foundthat CeO₂ also showed with considerable difference between dark and light DSSCs performance, when loaded with RB dye. The working mechanism of solar cells with fluorine-doped tin oxide (FTO)/CeO₂/RB dye/carbon-coatedFTO is discussed. These solar cells show VOC <126>360 mV, JSC <126>0.25 mA cm-2-2 and fill factor <126>63 with efficiency of 0.23. These results are better as compared to costly ruthenium dye-sensitized CeO₂ photoanode.

10 illus, 1 table, 41 ref

008357   Sangeetha C C;Madhivanane R (Physics Dep, Manonmaniam Sundaranar Univ, Tirunelveli-627 012, Email: carosangee@gmail.com) : Experimental and theoretical spectroscopic properties of quinazoline. Asian J Chem 2016, 28(4), 844-52.

In the present study, FT-IR and FT-Raman spectra of quinazoline were recorded and the observed vibrational frequencies were completely assigned. The vibrational frequencies, infrared intensities and Raman scattering activities of the quinazoline were computed using DFT (B3LYP) and HF methods with basis set 6-311++G(d,p) and the corresponding results were tabulated. The calculated and scaled wave number shows good agreement with the experimental values. The influence of the presence of N atom in the skeletal ring on the vibrations of the molecules have been discussed. Moreover, the chemical shifts of the compound were calculated from ^{13C NMR and 1H NMR by using the Gauge Independent Atomic Orbital (GIAO) method. A UV-visible spectra of the molecule was also experimentally recorded and stimulated by HF and DFT methods and analysis on the electronic properties, absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies were reported. The calculated HOMO and LUMO energies and the energy gap analysis shows the charge transformation within the molecule. The polarizability and hyperpolarizability of the compound were also calculated and the results indicates that the chosen compound is a good non-linear optical (NLO) material. The thermodynamic properties such as thermal energy, heat capacity and entropy of the quinazoline were calculated in gas phase.}

7 illus, 8 tables, 52 ref