014471   Mishra V K;Tiwari R K;Sarabdeep Kaur; Shrivastava P K (Physics Dep, Govt. P.G. Science College, Rewa-486 001, Email: pankaj_in2001@rediffmail.com) : Study of relation between coronal mass ejections and cosmic ray intensity variation. Ultra Scient phys Sci 2010, 22(1), 91-4.

Investigates the relationship between Coronal Mass Ejection (CME) and Cosmic ray intensity (CRI) variation on long-term basis. Extends the effects of CMEs rates on cosmic rays for the solar cycle 23. To carry out the study, tooke all Coronal Mass Ejection data of LASCO during the period of solar cycle 23. From the analysis, we observed a good relationship between occurrence rate of CMEs and cosmic ray intensity variation.

2 illus, 6 ref

014470   Mishra M;Mishra G R;Chaudhary N K;Tripathi V (Electronics Dep, D.D.U. Gorakhpur Univ, Gorakhpur, Email: mmanishm@yahoo.com) : Design and implementation of SD2 fast adder for fast DSP processors. Ultra Scient phys Sci 2010, 22(2), 259-64.

Addition is the most important and frequently used arithmetic operation in computer system and DSP processors. Generally two methods can be used to speed up the addition operation. One is to explicitly shorten the carry-propagation chain by using circuit design techniques, such as detecting the completion of the carry chain as soon as possible like CLA adder. Another is to convert the operands from the binary system to a redundant number system, so that addition becomes carry - free. In this paper SD2 adder of different standard bit length i.e. 4, 8,16, 32,64 etc. is generated on VHDL platform and its performance is compared with CLA in terms of area, time and power consumption report generated by VHDL. Lastly, efficiency of standard fast adders is compared with SD2 adder. SD2 adder is found suitable where iterative addition is involved, like digital filters and FFT/IFFT processors.

3 illus, 4 tables, 8 ref

014469   Mellado B (Physics Dep, Wisconsin-Madison Univ, Madison, Wisconsin 53706, USA, Email: bmellado@mail.cern.ch) : Prospects for higgs boson searches at the large hadron collider. Pramana J Phys 2009, 72(1), 15-22.

Summarizes the sensitivity for the CMS and ATLAS experiments at the LHC to discover a Standard Model Higgs boson with relatively low integrated luminosity per experiment. The most relevant discovery modes are dealt with. A brief discussion on the expected performance from these experiments in searches for one or more of the Higgs bosons from the minimal version of the supersymmetric theories is also included.

5 illus, 18 ref

014468   Mahipal Singh (Physics Dep, Govt. P.G. College, Bageshwar-263 642, Email: dmpsc@rdiffmail.com) : Influence of temperature and carrier density on supercurrent density in SIS junction. Ultra Scient phys Sci 2010, 22(2), 401-8.

Deals with the study of the supercurrent density as a function of temperature, carrier density and other microscopic interactions that exist in layered cuprate superconductors. For this purpose, we have considered tight binding bilayered Hubbard Hamiltonian containing intra and interlayer attractive interactions responsible for intra and interlayer pairing of charge carriers(holes). We have assumed that the charge carrier in the nearest neighbour layers are coupled by a tunneling matrix element alongwith an attractive interaction between the layers. The situation considered here for the bilayered cuprates is similar to a SIS junction where the conducting CuO₂ planes act as superconducting electrodes of the junction and charge reservoir region between them as insulating barrier. Finally,we have got the expressions for the superconducting order parameters, carrier density and supercurrent density within CuO₂ plane (I_ab) and perpendicular to the planes(I_c) for such SIS junction. The numerical analysis shows that supercurrent density depends on temperature, carrier density and various other microscopic parameters of the model Hamiltonian. Finally, we have compared our theoretical results with the existing experimental findings in bilayered cuprate superconductors.

2 illus, 24 ref

014467   Magnea L (Di Fisica Teorica Dep, Torino Univ, , Email: magnea@to.infn.it) : All-order results for soft and collinear gluons. Pramana J Phys 2009, 72(1), 69-81.

Some general features and some recent developments concerning the resum-mation of long-distance singularities in QCD and in more general non-Abelian gauge theories are reviewed. The field-theoretical tools of the trade are emphasized, with the focus mostly on the exponentiation of infra-red and collinear divergences in amplitudes, which underlies the resummation of large logarithms in the corresponding cross-sections. Some recent results concerning the conformal limit, notably the case of N = 4 superymmetric Yang-Mills theory are also described.

29 ref

014466   Lee S H;Morita K (Institute of Physics and Applied Physics, Yonsei Univ, Seoul-120 749, Email: suhoung@yonsei.ac.kr ) : Charmonium states in quark-gluon plasma. Pramana J Phys 2009, 72(1), 97-108.

Discusses how the spectral changes of quarkonia at T_c can reflect the 'critical' behaviour of QCD phase transition. Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the scalar and spin-2 gluon condensates near T_c. We also parametrize these changes into the electric and magnetic condensate near T_c. While the magnetic con-densate hardly changes across T_c, we find that the electric condensate increases abruptly above T_c. Similar abrupt change is also seen in the scalar condensate. Using the QCD second-order Stark effect and QCD sum rules, we show that these sudden changes induce equally abrupt changes in the mass and width of J/ψ, both of which are larger than 100 MeV at slightly above T_c.

5 illus, 1 table, 36 ref

014465   Kumar V S (Physics Dep, Swami Dayananda College of Arts and Science, Manjakkudi, Tiruvarur District-612 610) : Internal pressure and free volume of DL-nor leucine-water solution. Ultra Scient phys Sci 2010, 22(2), 327-30.

Ultrasonic velocity, density and viscosity of aqueous solutions of amino acid were measured at various temperatures from 303 K to 328 K. The internal pressure and Free Volume with respect to different molalities are established under the effect of temperature for dl-nor Leucine-water solutions.

2 illus, 5 ref

014464   Kumar K;Saxena S (Physics Dep, Bareilly College, Bareilly-243 005, Email: kamleshsharma80@gmail.com) : Ionization cross section of alkali atom by electron. Ultra Scient phys Sci 2010, 22(2), 293-6.

Computed ionization cross section (ICS) of Lithium by electron impact in the energy range 5 to 35eV using time dependent close coupling (TDCC) method. The present results are found to be in excellent agreement with the other available results viz convergent close coupling (GCC) and the distorted wave approximation (DWA) calculations and experimental measurements. However some discrepancies suggested that more and more theoretical as well as experimental work is required.

1 illus, 10 ref

014463   Khanna K M;Kanyeki G F;Rotich S K;Torongey P K;Ameka S E (Physics Dep, Moi Univ, P.O. Box 1125, Eldoret, Kenya) : Anharmonic perturbation of neutron-proton pairs by the unpaired neutrons in heavy finite nuclei. Indian J pure appl Phys 2010, 48(1), 7-15.

The properties of a finite heavy nucleus in which the number of neutrons N is not equal to the number of protons Z, N <62> Z, have been studied. It is assumed that the core of the nucleus is composed of proton-neutron pairs and the excess neutrons constitute the surface region of the nucleus. The interaction between a neutron and a proton constituting the neutron-proton pair is assumed to be harmonic. The unpaired neutrons in the surface region are assumed to interact with the neutron-proton pairs in the core of the nucleus anharmonically. Many body perturbation theory has been used to calculate the total energy of the nucleus, and thereby, we have calculated the binding energy per nucleon, called the binding fraction, the specific heat and the transition temperature. Speculation, as to how the alpha, beta and gamma radiations are emitted by a heavy nucleus, is also presented.

9 illus, 8 tables, 15 ref

014462   Khamedi R;Fallahi A;Refahi Oskouei A;Ahmadi M (Mechanical Engineering Dep, Amirkabir Technology Univ, Tehran, Iran, Email: afallahi@aut.ac.ir) : Effect of martensite phase volume fraction of dual-phase steels on acoustic emission signals under tensile loading. J pure appl Ultrasonics 2009, 31(4), 133-7.

A new method is introduced to identify the mechanisms of crack initiation and failure in the various phases of Dual-Phase steels. For this aim Acoustic Emission monitoring has been used during tensile test of several dual phase steels with various volume fraction of the martensite second phase and attempted to relate the AE signals and various failure mechanisms in these steels. Different signals, which related to two mechanisms of failure, (because of martensite content in these types of steels) have been seen. By Fast Fourier Transformation (FFT) of signals in each peak of energy rate, it seems a good relationship between peak frequencies in these locations and mechanisms of failure in these steels.

3 illus, 1 table, 15 ref

014461   Kavitha E;Sundaraganesan N;Sebastian S (Physics (Engg.) Dep, Annamalai Univ, Annamalai Nagar-608 002, Email: sundaraganesan_n2003@yahoo.co.in) : Molecular structure, vibrational spectroscopic and HOMO, LUMO studies of 4-nitroaniline by density functional method. Indian J pure appl Phys 2010, 48(1), 20-30.

Quantum mechanical calculations of energies, geometries and vibrational wavenumbers of 4-nitroaniline (4NA) were earned out by using Density functional theory (DFT/B3LYP/6-311++G(d,p)/CC-pvdz/Aug-cc-Pvdz) method. The optimized geometrical parameters obtained by B3LYP method show good agreement with experimental X-ray data. The best level of theory in order to reproduce the experimental wavenumbers is B3LYP method with the 6-311++G(d,p) basis set. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. A detailed interpretation of the infrared spectra of 4NA was also reported. The calculated HOMO and LUMO energies show that charge transfer occurs in the molecule. The theoretical spectrogram for FTIR and FT-Raman spectra of the title molecule have been constructed.

6 illus, 3 tables, 51 ref

014460   Kasana R S;Deshmukh A K (Physics & Electronics Dep, Dr. Hari Singh Gour Central Univ, Sagar, Email: irkasana7158@gmail.com) : Fiber optic interferometric refractometer for the study of variation of refractive index of sodium chloride with concentration. Ultra Scient phys Sci 2010, 22(1), 19-24.

A technique for the study of variation of refractive index of liquid has been reported in this paper. The proposed approach is superior to the existing ones because of its significant role in the industry, instrumentation, optical and chemical engineering etc. The fiber optic interferometric refractometer consist of fiber optic probe, a bottom sided fully silver polished piano parallel glass plate, a rectangular temperature controller cell filled with liquid, photodiode detector, and digital millimeters etc. The fiber optic probe is immersed into the measuring liquid. The light from the fiber optic transmitter is coupled into the transmitting fiber. After the multiple reflection of light from the piano parallel glass plate equally distanced narrow and dark fringes are develop in to the reflected region of light. The intensity of fringes is collected by the receiving fiber and forwarded to the detector and digital millimeter. The output intensity is measured by changing the position of fiber optic probe and the measurement carried out for the various concentration of sodium chloride and compared the result.

5 illus, 17 ref

014459   Kar D C;Sahu R;Jayarajan K;Ray D D;Singh M (Remote Handling and Robotics Div, BARC Technology, Mumbai-400 085) : Development of digital radiotherapy simulator: a device for tumour localization, radiotherapy planning and verification. BARC Newsl 2011, (318), 63-9.

Radiation therapy is one of the established modes of cancer treatment. For the safe and effective radiation therapy, it is necessary to plan and deliver the radiation beam accurately. Radiotherapy Simulator helps in identifying the organs at risk and in localising the cancer-affected tissues. For teletherapy, the Simulator would also help in choosing the right radiation beam and aiming it at the target. Although, radiotherapy simulator is an essential tool for improving the quality of teletherapy, there is acute shortage of such machines in our country due to the high cost of the imported units and the lack of indigenous technology. In fact, many cancer hospitals with teletherapy units do not have radiotherapy simulator. Considering the growing incidence of cancer and the need for such devices, Bhabha Atomic Research Centre (BARC), Mumbai has recently developed a Radiotherapy Simulator. This article briefly describes some of the features of the indigenous Radiotherapy Simulator.

5 illus, 6 ref

014458   Kajita T (ICRR and IPMU, Tokyo Univ, Kashiwa-no-ha 5-1-5, Kashiwa, Chiba 277-8582, Japan, Email: kajita@icrr.u-tokyso.ac.jp) : Future of neutrino experiments. Pramana J Phys 2009, 72(1), 109-17.

Atmospheric, solar, reactor and accelerator neutrino oscillation experiments have measured Δm²₁₂, sin² θ₁₂, |Δm²₂₃| and sin² 2θ₂₃. The next stage of the oscillation studies should be the observation of a finite sin² 2θ₁₃. If a non-zero sin² 2ρ₁₃ is observed, the subsequent goals should be the observation of the CP violation and the determination sign of Δ_m²₂₃. Possible future neutrino oscillation experiments that could assess these questions are discussed.

5 illus, 32 ref

014457   Jagjeet Kaur;Suryanarayana N S;Dubey V (Physics Dep, Govt. Vishwanath Yadav Tamaskar Post Graduate Autonomous College, Durg-491 001, Email: jagjeet_62@yahoo.co.in) : Electroluminescence in manganese doped two host matrix phosphor (Zn, Cd) S:Mn, Cl. Ultra Scient phys Sci 2010, 22(2), 351-6.

The properties of electroluminescence (EL) of the electroluminophor constituting the two host matrix with one impurity are the subject matter of the present paper. The voltage and frequency dependence of EL is studied. The effect of activator concentration on EL is reported and the variation of EL brightness with increase in the content of CdS has been studied. It has been observed that the brightness B versus 1/√v is a straight line with a negative slope. In frequency dependence, at lower frequency the brightness increases linearly with applied voltage and at the high voltages it appears to increase linearly. The EL brightness is found to be maximum for a given concentration of the activator of phosphor, beyond which the quenching starts. For a given activator concentration the EL brightness is found to be maximum for a particular concentration of CdS in (Zn, Cd) S: Mn, Cl phosphor.

8 illus, 19 ref

014456   Hirsch M (AHEP Group, Instituto de fisica Corpuscular - C.S.I.C./ Valencia De Univ, Edificio de Institutos de Paterna, Apartado 22085, E-46071 Valencia, Spain, Email: mahirsch@ific.uv.es) : Neutrino mass matrix and (Selected) variants of A₄. Pramana J Phys 2009, 72(1), 183-93.

Recent neutrino oscillation experiments have measured leptonic mixing angles with considerable precision. Many theoretical attempts to understand the peculiar mixing structure, observed in these measurements, are based on non-Abelian flavour symmetries. This talk concentrates exclusively on models based on the non-Abelian symmetry A₄. A₄ A₄ is particularly well suited to describe three family mixing, and allows to explain the near tri-bimaximal mixing observed. Special emphasis is put here on the discussion of the neutrinoless double beta decay observable <193>m_v<209>. Different models based on A₄, with very similar predictions for neutrino angles can yield vastly different expectations for <193>m<209>. Neutrinoless double beta decay can thus serve, in principle, as a discriminator between different neutrino mass models.

4 illus, 3 tables, 36 ref

014455   Gupta V K;Jangid R A (Microwave Research Lab, Deptt of Physics, Raj Rishi Autonomous, Govt P.G. College, Alwar-301 001, Email: contactvkg@yahoo.co.in) : Variations of microwave penetration depth with moistness of the soil of different textures in view of remote sensing. Ultra Scient phys Sci 2010, 22(1), 31-6.

The real and imaginary parts of the complex permittivity of soils of different textures are calculated at a single microwave frequency 9.78 GHz and at room temperature 330C by wave guide cell method. In the view of active and passive microwave remote sensing, penetration depth for the microwaves within the moist soils of different textures is estimated treating uniform soil moisture profile for near surface soil layer. This was observed that penetration depth has the negative correlation with soil moisture content and hardly depends upon the texture at low soil moisture contents (SMC). Penetration depth decreases as clay portion in the moist soil increases and this effect becomes more significant at higher moisture levels. Further, attenuation or power loss per unit length of the moist soils of different textures is also estimated. Power loss per unit length of the moist soil for the microwave propagation increases as the SMC increases. Further, attenuation also depends on the texture of the soil.

3 illus, 1 table, 17 ref

014454   Gireesh Kumar;Ramakrishna S (Sree Vidyanikethan Engineering College, Tirupati, Andhra Pradesh, Email: jgireeshkumar@yahoo.co.in) : MHD flow of viscous fluid past an impulsively moving isothermal vertical plate through porous medium with chemical reaction and heat generation/absorption. Ultra Scient phys Sci 2010, 22(2), 446-54.

This paper is an analytical study of the thermal radiation and heat generation/absorption effects on MHD flow of an electrically conducting, incompressible, viscous fluid past an impulsively moving isothermal vertical plate through porous medium in the presence of uniform suction and taking into the homogeneous chemical reaction of first order. The equations governing the flow field are solved by analytical method. The velocity, temperature and concentration have been evaluated for variation in the different governing parameters like Magnetic parameter (M), Prandtl number (Pr), Radiation parameter (N), Schmidt number (Sc), heat generation/absorption parameter (Q), Grashof number (Gr), Modified Grashof number (Gc).

8 illus, 9 ref

014453   Gaware J J;Sahoo B K;Sapra B K;Mayya Y S (Radiological Physics and Advisory Div, BARC Technology, Mumbai-400 085) : Development of online radon and thoron monitoring systems for occupational and general environments. BARC Newsl 2011, (318), 45-51.

Online radon and thoron monitors have been developed using ZnS(Ag) detector for continuous monitoring of concentrations in occupational and general environments. Their performance has been tested successfully both in laboratory and field conditions. Special features of these monitors include low cost, high sensitivity and non-interference of humidity and trace gases. The capability of these radon monitors for networked radon monitoring in U mines and in the U-tailings pond has been demonstrated. The thoron monitor is designed for stack monitoring of thoron release in a thorium processing facility. Being highly sensitive, these monitors can also be used for radon/moron monitoring in dwellings, radon exhalation measurements, radon concentration in water samples and thoron emission measurements from monazite sands in High Background Radiation Areas.

12 illus, 4 ref

014452   Garg A (NO, , Nehru Planetarium Teen Murti House, New Delhi-110 011, Email: friends_ang@hotmail.com) : Using low cost apparatus to perform astrophysical research at school level. Resonance 2010, 15(2), 170-5.

The contribution by amateurs to research in the field of observational astronomy has been known from several centuries, which is a motivation for amateurs of today to get into research. In the recent times sophisticated techniques have caused a revolution in photography. In this article we discuss some of the aspects of image processing techniques that can be used on the images taken by the amateurs/students using simple imaging instruments like a digital camera or a webcam and the kind of useful astrophysical results that can be extracted using these techniques.

9 illus, 2 ref

014451   Ganesh K E;Umesh T K;Narasimhamurthy B (S&H Dep, PES Institute of Technology, BSK III Stage, Bengaluru-560 085, Email: ganeshke@gmail.com) : Interannual variability in time scale characteristics of aerosol optical thickness over Mysore, India. Indian J Radio Space Phys 2010, 39(2), 80-91.

The atmospheric measurements were carried out to collect data on aerosol optical thickness (AOT) and precipitable water vapour. A portable sunphotometer had been used to collect the required data. Analysis of the collected data shows a diurnal, monthly and seasonal variation in AOT and its correlation with rainfall. It was observed that AOT at shorter wavelength decreases at higher rate than at longer wavelength. The effects such as photosynthetic action and mixing layer phenomena contribute to the diurnal variation of AOT. Minimum and maximum average spectral AOTs differ with respect to month. Also in any aerosol year, AOTs are high during summer and increase over the years. The winter records lower AOT values as compared to summer. The consequences and causes for this type of variability in AOT characteristics have been presented in the paper.

14 illus, 2 tables, 26 ref

014450   Gamberg L P (Physics Dep, Penn State Berks Univ, Reading, PA, 19610, USA, Email: lpg10@psu.edu) : Transverse spin and momentum correlations in quantum chromodynamics. Pramana J Phys 2009, 72(1), 55-68.

The naive time reversal odd ('T-odd') parton distribution and fragmentation functions are explored. We use the spectator model framework to study flavour dependence of the Boer-Mulders (h^⊥₁) and Sivers (f^⊥_1T) functions as well as the 'T-even' but chiral odd function h⁹⁴_1L. These transverse momentum-dependent parton distribution functions are of significance for the analysis of azimuthal asymmetries in semi-inclusive deep inelastic scattering, as well as for the overall physical understanding of the distribution of transversely polarized quarks in unpolarized hadrons. In this context we also consider the Collins mechanism and the fragmentation function H⁹⁴₁. As a by-product of this analysis we calculate the leading twist unpolarized cos(20) asymmetry, and sin(20) single spin asymmetry for a longitudinally polarized target in semi-inclusive deep inelastic scattering.

6 illus, 57 ref

014449   Fleuret F (Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, 91128, Palaiseau, France, Email: fleuret@in2p3.fr) : Recent relativistic heavy ion collider results on photon, dilepton and heavy quark. Pramana J Phys 2009, 72(1), 23-35.

Presents here a review of the recent results obtained by the RHIC experiments in the framework of QCD under extreme conditions of high temperature or large baryon density, the so-called quark gluon plasma. We focus on a specific category of observables: the electromagnetic probes which cover a large spectrum of experimental studies.

13 illus, 1 table, 17 ref

014448   Dudas E (CPhT-Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France, Email: emilian.dudas@cpht.polytechnique.fr) : Supersymmetry breaking. Pramana J Phys 2009, 72(1), 131-41.

Reviews the various mechanisms of supersymmetry breaking and its transmission to the observable sector. We argue that hybrid models where gauge dominates over gravity mediation, but gravity provides the main contributions to the Higgs sector masses and the neutralino mass, are able to combine the advantages and reduce the disadvantages of the two transmission mechanisms.

13 ref

014447   Deswal S;Rajneesh Kumar (Mathematics Dep, Guru Jambheshwar Univ of Science & Technology, Hisar-125 001, Email: spannu_gju@yahoo.com) : Continuous heat sources in a generalized thermo-microstretch elastic half-space under three theories. Proc Natn Acad Sci India-Sect A 2009, 79(Pt1), 59-69.

The present paper is concerned with the investigation of disturbances in a homogeneous, isotropic generalized thermo-microstretch elastic medium in the context of three linear generalized thermoelasticity theories: Lord-Shulman, Green-Lindsay and Green-Naghdi theories, when a continuous heat source is acting on the free surface of the medium. The Laplace-Fourier integral transforms are inverted by using a numerical technique. The analytical expressions of the displacement components, stress, couple stress, microstress and temperature field so obtained in the physical domain are computed numerically and illustrated graphically. Comparisons are made with the results predicted by the three theories of generalized thermoelasticity. The results of micropolar generalized thermoelasticity are deduced as special case from the present formulation and the stretch effect on various expressions is depicted graphically.

5 illus, 28 ref

014446   Choudhury S;Betty C A;Girija K G (Chemistry Div, BARC Technology, Mumbai-400 085) : Development of room temperature NH₃ gas sensors based on ultrathin SnO₂ films. BARC Newsl 2011, (318), 39-44.

Ultrathin SnO₂ film deposited by Langmuir-Blodgett technique showed high sensitivity (<60> 3 ppm) for NH₃ gas at room temperature with fast response (<60>1 min) and 90% recovery within half-an-hour. The sensitivity remained the same and was reproducible even after one year indicating the long term stability of the sensor. The sensor was highly specific to NH₃ in presence of the other reducing gases - H₂S, SO₂, CO, H₂ and CH₄. In the presence of H₂S and SO₂, the film conductivity increased whereas it decreased with ammonia. There was no response with other reducing gases.

1 table, 4 ref

014445   Chaudhari H C;Shinde V J (P G Dep of Physics, Microwave Research Centre, J E S College, Jalna-431 203, Email: hcchaudhari@rediffmail.com) : Dielectric properties of black and red soils at microwave frequency. Indian J Radio Space Phys 2010, 39(2), 103-6.

The real (ε') and imaginary (ε") parts of the complex dielectric constant (ε^<35>) of soil with varied moisture content have been determined experimentally under laboratory conditions at 9.44 GHz using infinite sample method. The value of ε'> and ε"> first increases slowly and then rapidly with moisture content. From this data, the ac conductivity and relaxation time are also reported. The result shows the change in electrical properties of soil before and after the addition of water. These results provide basis for using ground penetrating radar or other high frequency electromagnetic sensors in the detection of soil moisture content.

4 illus, 1 table, 10 ref

014444   Bose P (Physics Dep, Govt. V.Y.T. Autonomous P.G. College, Durg-490 001) : Photoluminoscence. XRD and SEM studies of chemically deposited undoped and La, Pr doped (Cd - Pb) S films. Ultra Scient phys Sci 2010, 22(1), 163-8.

The present paper reports results of photoluminescence emission spectra, photoluminescence and temperature dependence of photoluminescence brightness of chemically deposited (Cd-Pb)S, (Cd-Pb)S:NaF, (Cd-Pb)SrNaF, La and (Cd-Pb)S:NaF, Pr doped films. Along with these results of X-ray diffraction and SEM studies have also been presented and discussed.

6 illus, 13 ref

014443   Borgohain A;Maheshwari N K;Vijayan P K;Sinha R K (Reactor Design & Development Group, BARC Technology, Mumbai-400 085) : Heavy liquid metal technology development. BARC Newsl 2011, (318), 28-33.

Liquid metal is increasingly getting more attention as the coolant for advanced reactor systems. This article deals with the activities performed on coolant technology for high temperature reactor applications. A lead bismuth natural circulation loop has been set up, for thermal hydraulics, instrument development and material related studies relevant to the Compact High Temperature Reactor.

8 illus, 9 ref

014442   Bhattacharyya G (NO, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata-700 064, Email: gautam.bhattacharyya@saha.ac.in) : Electroweak symmetry breaking and beyond the standard model physics - a review. Pramana J Phys 2009, 72(1), 37-54.

In this talk, I shall first discuss the Standard Model Higgs mechanism and then highlight some of its deficiencies making a case for the need to go beyond the Standard Model (BSM). The BSM tour will be guided by symmetry arguments. I shall pick up four specific BSM scenarios, namely, supersymmetry, little Higgs, gauge-Higgs unification, and the Higgsless approach. The discussion will be confined mainly on their electroweak symmetry breaking aspects.

8 illus, 28 ref

014441   Bhatnagar D;Joshi D;Ashok Kumar;Jain C L (NO, National Physical Laboratory, New Delhi-110 012, Email: npl.ashok@gmail.com) : Direct acoustic impedance measurements of dimethyl sulphoxide with benzene carbon tetrachloride and methanol liquid mixtures. Indian J pure appl Phys 2010, 48(1), 31-5.

Ultrasonic impedance has directly been measured tor various binary mixtures using a novel experimental technique. The mixtures are dimethyl sulphoxide with benzene, carbon tetrachloride and methanol at 295 K in different mole fraction ratios. The acoustic impedance of binary mixtures thus obtained was found to be in good agreement with those calculated from experimentally measured ultrasonic velocity and density values. It is shown that the new method can be used to replace the time consuming conventional method of measuring velocity and density separately and then calculating impedance from these two parameters.

4 illus, 2 tables, 15 ref

014440   Bhardwaj D;Sharma K;Bhatnagar D;Sancheti S; Soni B (Microwave Laboratory, Physics Dep, Rajasthan Univ, Jaipur-302 004) : Design and analysis of a gap coupled split circular patch with elliptical slot filled with elliptical patch. Indian J Radio Space Phys 2010, 39(2), 107-13.

The paper presents radiation performance of a gap coupled split circular patch with elliptical slot filled with elliptical patch. Initially, a circular elliptical ring slot antenna is taken and it is modified step by step to achieve an end product with desired performance. The performance of designed antenna after each step is presented systematically. The simulated and measured results of proposed antenna are compared with that of a circular elliptical ring slot antenna. The gap between two gap-coupled semi circular elliptical ring structures and the length of major and minor axis of inserted inner elliptical patch are optimized to achieve best performance. It is observed that with proposed modifications in circular patch geometry, impedance bandwidth, gain and radiation efficiency of antenna are improved considerably. The resonance frequency of end product is lower than that of a circular elliptical ring slot antenna which indicates that for achieving identical resonance frequencies from circular elliptical ring slot antenna and modified circular patch geometry, effective patch size of modified antenna must be reduced. The outcome results into a further compact circular patch antenna with much improved performance.

9 illus, 1 table, 14 ref

014439   Berera A (School of Physics and Astronomy, Edinburgh Univ, Edinburgh EH9 3JZ, UK, Email: ab@ph.ed.ac.uk) : Developments in inflationary cosmology. Pramana J Phys 2009, 72(1), 169-82.

Presents some recent work that has been done in inflationary cosmology. First a brief review is given of the inflation scenario and its basic models. After that, one of the main problems in developing inflationary models has been the requirement of a very flat inflation potential. In solving this problem, supersymmetry has played a major role, and the reasons will be discussed and a specific example of the SUSY hybrid model will be examined. Some problems introduced by SUSY such as the η and gravitino problems will then be discussed. Then in a different direction, the quintessential inflation model will be examined as a proposal where a single scalar field plays the role of both the inflaton at early time and the dark energy field later. The final topic covered is developments in understanding dissipation and particle production processes during the inflationary phase.

32 ref

014438   Benoy M D;Mohammed E M (Physics Dep, M.A. College, Kothamangalam-686 666, Email: emmohammed_2005@yahoo.com) : Electrical and optical properties of lead selenide thin films. Sci Soc 2010, 8(1), 81-4.

Lead selenide (PbSe) thin films have been prepared by reactive evaporation. Hot probe studies show that the films are p-type. Polycrystalline PbSe films were obtained at a substrate temperature = 373 ± 5 K. Electrical conductivity as a function of temperature is studied. Activation energy is calculated to be = 0.7 eV. Optical absorption studies show a direct forbidden transition with band gap 1.1 ± 0.02 eV and an average refractive index 2.75 in the 1200 to 1700 nm wavelength range.

6 illus, 1 table, 66 ref

014437   Belyaev A;Christidi I A;De Roeck A;Godbole R M;Mellado B;Nyffeler A;Petridou C;Roy D P (School of Physics & Astronomy, Southampton Univ, Southampton SO17 1BJ, Email: a.belyaev@phys.soton.ac.uk) : Dictionary of large hadron collider signatures. Pramana J Phys 2009, 72(1), 229-37.

Reports on a plan to establish a 'Dictionary of LHC Signatures', an initiative that started at 'the WHEPP-X workshop in Chennai, January 2008. This study aims at the strategy of distinguishing 3 classes of dark matter motivated scenarios such as R-parity conserved supersymmetry, little Higgs models with T-parity conservation and universal extra dimensions with KK-parity for generic cases of their realization in a wide range of the model space. Discriminating signatures are tabulated and will need a further detailed analysis.

2 tables, 25 ref

014436   Belyaev A (Particle Physics Dep, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX, UK) : Supersymmetry status and phenomenology at the large hadron collider. Pramana J Phys 2009, 72(1), 143-60.

Large Hadron Collider (LHC) has a great chance to finally reveal supersym-metry which remains a compelling theory for over 30 years in spite of lack of its discovery. It might be around the corner the present LHC era with sensitive dark matter search experiments and international linear collider hopefully coming up in the near future.

5 illus, 91 ref

014435   Bakare N O;Chukwuma V U;Adekoya B J (Physics Dep, Olabisi Onabanjo Univ, Ago-Iwoye, Nigeria, Email: sesanbakare1@yahoo.com) : Geomagnetic observations and ionospheric response during storm on 14 April 2006. Indian J Radio Space Phys 2010, 39(2), 71-9.

A study of the intense geomagnetic storm on 14 April 2006 has been done using ionospheric data obtained from ionosonde station located in the American sector. The results indicate appearance of positive storm before the beginning of geomagnetic disturbance in the mid latitudes and occurrence of strong negative phase at the equator. It was observed that magnetospheric process, responsible for Dst decrease, was the enhancement of the plasma sheet and appeared to be caused by the combined effect of large intense proton density at 1400 hrs UT, southward turning of Bz at 1800 hrs UT and enhancement of speed stream at 1400 hrs UT on 13 April. The ionosonde stations located at American sectors are: College (64.9°N), Gakoma (62.4°N), Goose bay (53.3°N), Boulder (40.0°N), Dyess (32.2°N), Eglin AFB (30.4°N) and Puerto Rico (18.5°N). The present results were obtained using critical frequency foF2. The peak height of F2 layer hmF2 showed that the stations had some degree of simultaneity in the depletion of foF2 between 2000 hrs UT on 14 April and 0100 hrs UT on 15 April and that of hmF2 between 1600 and 1900 hrs UT on 15 April.

3 illus, 1 table, 30 ref

014434   Ashok Kumar Reddy A V (Polymer Science & Tech. Dep, S.K. Univ, Anantapura, Andhra Pradesh, Email: chowdojirao@) : Compatibility studies of chitosan/PEG blend in 2% aqueous acetic acid solutions by ultrasonic velocity, refractive index and viscosity techniques, at 303.15K. J pure appl Ultrasonics 2009, 31(4), 160-8.

Chitosan (CS), a polysaccharide, has many industrial applications and its miscibility studies are most useful. Synthetic polymer, poly (ethylene glycol) (PEG) is a subject of current research interest. Hence, miscibility of CS and PEG in aqueous acetic acid solutions has been studied by ultrasonic velocity, refractive index and viscosity techniques at 303.15 K, over a wide range of compositions ranging from 0-100% of CS in CS/PEG blends. The results of ultrasonic velocity and its derived acoustical parameters such as adiabatic compressibility (Pad), acoustic impedance (Z), relaxation strength (γ_s) and Rao number (R) have been used to discuss the miscibility/immiscibility of the blend under study. These discussions revealed that the blend is miscible up to 40% of chitosan in the blend and beyond this, the blend is immiscible. Using the viscosity data, the interaction parameters ΔB, μ and α were computed and used to discuss the miscibility/immiscibility nature of this blend. The ultrasonic velocity results are further confirmed by viscosity and refractive index results.

3 illus, 2 tables, 18 ref

014433   Abraham R T;George A K (Chemical Engineering Dep, Box 400741. Virginia Univ, Charlottesville, Virginia VA22904-4741, USA, Email: akgeorge@squ.com) : Temperature dependent thermodynamic and thermo-elastic properties of crude oil. J pure appl Ultrasonics 2009, 31(4), 142-9.

The density, ultrasound velocity and specific heat capacity at constant pressure of three crude oil samples were measured between temperatures of 20°C to 60°C. The experimental tools used were, densitometry, ultrasonic interferometry and differential scanning calorimetry to evaluate the density, ultrasound velocity and the specific heat capacity, respectively. These measurements are further used to evaluate the adiabatic compressibility, coefficient of volume expansion and acoustic impedance of these three samples. To determine other important properties for the samples, a fundamental relationship between thermodynamic and thermo-elastic properties was determined. Using this relationship, the specific heat at constant volume, the ratio of specific heats and the isothermal compressibility was ascertained. Finally, to show the potential of the laboratory data, the temperature dependence of pressure, a relatively difficult measurement to make under reservoir conditions, was calculated using the isothermal compressibility and the coefficient of volume expansion.

8 illus, 1 tables, 11 ref

013306   Zhang J;Xu H (Laboratory of Photonic Information Technology, School of Infromation and Photon Electronic Science and Engineering, S, Guangzhou, 540006, China) : Optical computation based on nonlinear total reflectional optical switch at the interface. Pramana J Phys 2009, 72(3), 547-54.

A new scheme of binary half adder and full adder is proposed. It realizes a kind of all-optical computation which is based on the polarization coding technique and the nonlinear total reflectional optical switches.

6 illus, 2 tables, 12 ref

013305   Zhang J M;Wang F;Xu K W (College of Physics and Information Technology, Shaanxi Normal Univ, Si'an Jiaotong Univ, Xi'an 710062, China, Email: jianm_zhang@yahoo.com) : Self-interstitial configuration in molybdenum studied by modified analytical embedded atom method. Pramana J Phys 2009, 72(5), 857-69.

The stability of various atomic configurations containing a self-interstitial atom (SIA) in a model representing Mo has been investigated using the modified analytical embedded atom method (MAEAM). The lattice relaxations are treated with the molecular dynamics (MD) simulation at absolute zero of temperature. Six relatively stable self-interstitial configurations and formation energies have been described and calculated. The results indicate that the [111] dumbbell interstitial S₁₁₁ has the lowest formation energy, and in ascending order, the sequence of the configurations is predicted to be S₁₁₁, C, S₁₁₀, T, S₀₀₁ and O. From relaxed displacement field up to the fifth-NN atoms of six configurations, we know that the relaxed displacements depend not only on separation distances of the NN atoms from the defect centre but also strongly on the direction of the connected line between the NN atoms and the defect centre. The equilibrium distances between two nearest atoms in the core of the S₁₁₁, C, S₁₁₀, T, S₀₀₁ and O configurations are 0.72a, 0.72a, 0.71a, 0.72a, 0.70a and 0.70a, respectively.

4 illus, 4 tables, 31 ref

013304   Xuan W X;Wang F;Lin F W;Chen Z W (Physics Dep, Civil Aviation Flight, China Univ, Guanghan-618 307, People's Republic of China) : Electron paramagnetic resonance parameters of Mn<. Pramana J Phys 2009, 72(3), 569-75.

The EPR parameters (g factors g_||, g⊥ and zero-field splitting D) of Mn⁴⁺ ion in h-BaTiO₃ crystal are calculated from the complete high-order perturbation formulas based on a two-mechanism model for the EPR parameters of 3d³ ions in trigonal symmetry. In the model, not only the widely used crystal-field mechanism, but also the charge-transfer mechanism (which is not considered in crystal-field theory) are included. The calculated results are in reasonable agreement with the experimental values. The relative importance of charge-transfer mechanism to EPR parameters and the defect structure of Mn⁴⁺ centre in h-BaTiO₃ crystal obtained from the calculations are discussed.

28 ref

013303   Watanabe N (Physics Dep, Faculty of Engineering, Yokohama National Univ, Yokohama 240-8501, Japan, Email: d09sd202@ynu.ac.jp) : Application of FIRE for the calculation of photon matrix elements. Pramana J Phys 2009, 72(4), 639-55.

The next-to-next-to-leading order (the order αα²_s) corrections to the first moment of the polarized virtual photon structure function g₁^γ (x,Q²,P²) are studied in perturbative QCD for the kinematical region (Λ² (<60>(<60> P² (<60>(<60> Q², where -Q² (-P<6>2) is the mass square of the probe (target) photon and A is the QCD scale parameter. In order to evaluate the two-loop Feynman diagrams for the photon matrix element of the gluon operator, I apply the recently developed algorithm FIRE which reduces a complicated sum of scalar Feynman integrals to a linear combination of a few master integrals. The details of the calculation are presented.

4 illus, 25 ref

013302   Turakulov Z Y (NO, Ulugh Bek Astronomy Institute (UBAI), Astronomicheskaya 33, Tashkent-700 085, Uzbekistan, Email: tzafar@astrin.uzsci.net) : Weak gravitational field and Coriolis potential. Pramana J Phys 2009, 72(3), 473-9.

In mechanics of the mass point passage from one frame of reference to another moving with velocity u consists in subtracting this vector from the velocity of the particle. In general case the vector u is not constant, as, for example, when passing through a rotating frame, this operation creates inertial forces. Analysis of this phenomenon from the point of view of Lagrangian and Hamiltonian mechanics is interesting from the general relativistic point of view due to Einstein's principle of equivalence. Shows that the vector u plays the role of vector potential which, however, essentially differs from vector potential known in classical electrodynamics. Comparative analysis of the two kinds of vector potentials is completed.

4 ref

013301   Titus S S K;Dhulkhe S K;Yadav P;Jain K (Pational Physical Laboratory (NPLI), Council of Scientific and Indust, , New Delhi-100 012, Email: titus@mail.nplindia.ernet.in) : Development and performance evaluation of a dead weight force machine in 2-50N range. MAPAN 2009, 24(4), 225-32.

Results of the performance evaluation of a newly designed, developed and fabricated dead weight machines to realize forces in the range of (2-50) N are reported in this paper. Precision load cells of 20N, 50N and lOON having an expanded uncertainty of ± 0.03 % are used for this evaluation. The calibration of these load cells against the dead weight force machine shows that the repeatability (Rep) and reproducibility (Repr) are better than 0.003% and 0.005% respectively, over the entire range. The calibration data observed is found to closely agree with the calibration results obtained directly against the Physikalsich- Technische Bundesanstalt (PTB), Germany force standard machine having the relative measurement uncertainhJ of the force scale in the measuring range ≤0.002 %.

6 illus, 3 tables, 15 ref

013300   Tarafdar S;Nag S;Dutta T;Sinha S (Physics Dep, Condensed Matter Physics Research Centre, Jadavpur Univ, Kolkata-700 016, Email: sujata@phys.jdvu.ac.in) : Computer simulation of viscous fingering in a lifting hele-shaw cell with grooved plates. Pramana J Phys 2009, 72(4), 743-54.

Simulate viscous fingering generated by separating two plates with a constant force, in a lifting Hele-Shaw cell. Variation in the patterns for different fluid viscosity and lifting force is studied. Viscous fingering is strongly affected by anisotropy. We report a computer simulation study of fingering patterns, where circular or square grooves are etched on to the lower plate. Results are compared with experiments.

10 illus, 17 ref

013299   Suri A K (Materials Group, BARC, , Mumbai) : Innovative process flowsheet for the recovery of uranium from tummalapalle ore. BARC Newsl 2010, (NULL), 6-12.

4 illus, 1 table, 5 ref

013298   Sogut O;Byyukkasap E;Kucukonder A;Tarakcioglu T (Physics Dep, Faculty of Science and Letters, Kahramanmaras Sutcu Imam Univ, 46100 Kahramanmaras, Turkey, Email: os4fg@yahoo.com) : Measurement of vacancy transfer probability from K to L shell using K-shell fluorescence yields. Pramana J Phys 2009, 72(4), 711-8.

The vacancy transfer probabilities from K to L shell through radiative decay, η_KL, have been deduced for the elements in the range 19 ≤ Z ≤ 58 using K-shell fluorescence yields. The targets were irradiated with 7 photons at 59.5 keV from a 75 mCi ²⁴¹Am annular source. The K X-rays from different targets were detected with a high resolution Si(Li) detector. The measurement of vacancy transfer probabilities are least-squared fitted to second-order polynomials to obtain analytical relations that represent these probabilities as a function of atomic number. The obtained results agree with theoretical and fitted values.

3 illus, 1 table, 27 ref

013297   Singh D;Pandey D K (Applied Physics Dep, AMITY School of Engineering and Technology, Bijwasan, New Delhi-110 061, Email: dsingh1@aset.amity.edu) : Ultrasonic investigations in intermetallics. Pramana J Phys 2009, 72(2), 389-98.

Ultrasonic attenuation for the longitudinal and shear waves due to phonon-phonon interaction and thermoelastic mechanism have been evaluated in B2 structured in-termetallic compounds AgMg, CuZr, AuMg, AuTi, AuMn, AuZn and AuCd along (100), (111} and (110} crystallographic directions at room temperature. For the same evaluations, second- and third-order elastic constants, ultrasonic velocities, Gruneisen parameters, non-linearity parameter, Debye temperature and thermal relaxation time are also computed. Although the molecular weight of these materials increases from AgMg to AuCd, the obtained results are affected with the deviation number. Attenuation of ultrasonic waves due to phonon-phonon interaction is predominant over thermoelastic loss. Results are compared with available theoretical and experimental results. The results with other well-known physical properties are useful for industrial purposes.

3 illus, 5 tables, 31 ref

013296   Singh C P;Beesham A (Applied Mathematics Dep, Delhi College of Engineering, Bawana Road, Delhi-110 042, Email: cpsphd@rediffmail.com) : Locally-rotationally-symmetric Bianchi type-V cosmology with heat flow. Pramana J Phys 2009, 72(4), 793-8.

Presents a spatially homogeneous locally-rotationally-symmetric (LRS) Bianchi type-V cosmological model with perfect fluid and heat flow. A general approach is introduced to solve Einstein's field equations using a law of variation for the mean Hubble parameter, which is related to average scale factor of the model that yields a constant value for the deceleration parameter. Exact solutions that correspond to singular and non-singular models are found with heat flow. The physical constraints on the solution and, in particular, the thermodynamical laws that govern such solutions are discussed in some detail.

6 ref