Method of characteristics and solution of DGLAP evolution equation in leading order (LO) and next to leading order (NLO) at small-x

In this paper the singlet and non-singlet structure functions have been obtained by solving Dokshitzer, Gribove, Lipatov, Alterelli, Parisi (DGLAP) evolution equations in leading order (LO) and next to leading order (NLO) at the small x limit. Here we have used a Taylor Series expansion and then the method of characteristics to solve the evolution equations. We have also calculated t and x-evolutions of deuteron structure function and the results are compared with the New Muon Collaboration (NMC) data.Comment: 16 pages including 7 figure

Possible evidence of non-Fermi liquid behavior from quasi-one-dimensional indium nanowires

We report possible evidence of non-Fermi liquid (NFL) observed at room temperature from the quasi one-dimensional (1D) indium (In) nanowires self-assembled on Si(111)-7$\times$7 surface. Using high-resolution electron-energy-loss spectroscopy, we have measured energy and width dispersions of a low energy intrasubband plasmon excitation in the In nanowires. We observe the energy-momentum dispersion $\omega$(q) in the low q limit exactly as predicted by both NFL theory and the random-phase-approximation. The unusual non-analytic width dispersion $\zeta(q) \sim q^{\alpha}$ measured with an exponent ${\alpha}$=1.40$\pm$0.24, however, is understood only by the NFL theory. Such an abnormal width dispersion of low energy excitations may probe the NFL feature of a non-ideal 1D interacting electron system despite the significantly suppressed spin-charge separation ($\leq$40 meV).Comment: 11 pages and 4 figure

Ultrasonic Cleaning and Re-use of HEPA Filters in Nuclear Fuel Manufacturing Facility

In the nuclear industry, High Efficiency Particulate Air (HEPA) filters are used as an important engineering safeguard to prevent the potential release of airborne radioactive particulates into the environment during the plant operations. These filters have high efficiency (99.97%) in removing particulate matters in the sub-micron range and are widely used in the entire fuel cycle from the stage of mining/milling to nuclear waste management operations. Nuclear Fuel Complex (NFC) at Hyderabad manufactures nuclear fuel for all the commercial nuclear power reactors in the country.The fuel is in the form of high density Uranium dioxide (UO2) pellets clad in Zircalloy- 4 tubes. Many chemical and metallurgical processes are employed for the production of UO2 pellets starting from the raw material magnesium diuranate (MDU). HEPA filters are used for final filtration of off-gases from these processes as well as the working areas/plants. Each fully loaded HEPA filter contains around 3-5 kgs of uranium bearing fine powder, which needs to be recovered as it is a costly material. Normally, HEPA filters are used once-through, as suitable technique for nondestructive decontamination has not been developed. This has resulted in a large accumulation of loaded HEPA filters at NFC, which is a cause for concern. The reuse of the HEPA filt-ers depends on the extent of decontamination achieved. As the conventional cleaning techniques are found to be ineffective, the decontamination of HEPA filters presents a challenging problem. Therefore, development work was taken up at NFC to evolve a suitable decontamination technique for HEPA filters. A state-of-the-art ultrasonic decontamination technique using commercial acetone has been developed at NFC. The technique offers a suitable nondestructive method to ensure removal of uranium fines from the filter media completely and thereby rendering the HEPA filter suitable for reuse. The observations and results of this development work are presented in this paper

Synthesis of naturally occurring partial methyl ethers of myricetin

The synthesis of combretol, annulatin, and europetin-naturally occurring partial methyl ethers of myricetin-is described. Condensation of 2, 4, 6-trihydroxy-ω-methoxyacetophenone with tri-O-methyl galloyl chloride or tri-O-benzyl galloyl chloride furnished the appropriate 3-methoxyflavones, which by a series of reactions furnished the natural myricetin derivatives

Extended Self-similarity in Kinetic Surface Roughening

We show from numerical simulations that a limited mobility solid-on-solid model of kinetically rough surface growth exhibits extended self-similarity analogous to that found in fluid turbulence. The range over which scale-independent power-law behavior is observed is significantly enhanced if two correlation functions of different order, such as those representing two different moments of the difference in height between two points, are plotted against each other. This behavior, found in both one and two dimensions, suggests that the `relative' exponents may be more fundamental than the `absolute' ones.Comment: 4 pages, 4 postscript figures included (some changes made according to referees' comments. accepted for publication in PRE Rapid Communication

Neutrino scattering on polarized deuterons

The possible presence of an I=0 axial vector piece in the hadronic neutral current may be detected by looking for an asymmetry in the emission of the recoil deuterons in elastic scattering of neutrinos or antineutrinos on polarized deuterons. It is estimated that this asymmetry could be about 40% with the incident neutrinos in the energy range of tens of MeV

Occultations of 50 radio sources at 327 MHz

Radio positions and brightness distributions derived from lunar occultations observed with the Ooty radio telescope at 327 MHz are reported for 50 radio sources, most of them in the flux density range of 0.3-2×10-26Wm-2/Hz-1. A lange majority of the so urces is resolved, with angular sizes of about 2-20 arcsec. Only 13 sources are identified with optical objects; nine with galaxies, three with blue-stellar objects and one with a stellar object

Ooty occultations of 76 radio sources

Positional and structural information derived from lunar occultations observed at 327 MHz is presented for 76 radio sources, most of them of flux density less than 2×10-26Wm-2Hz-1. Only 16 sources are optically identified. Two of the stronger sources in the list, viz. PKS 1417-19 and MSH 16-205 have a head-tail type of radio structure. PKS 1417-19 appears to be associated with a small chain of faint galaxies. It is interesting that a close group of five radio sources, each with flux density ≥0.5 f.u. appears to be physically associated with the cluster Zw 0210.1 + 1857. One of the five sources coincides with a 19-mag BSO, while none of the other four is identified with an optical object on the basis of positional agreement

The Study of Goldstone Modes in ν\nu=2 Bilayer Quantum Hall Systems

At the filling factor $\nu$=2, the bilayer quantum Hall system has three phases, the spin-ferromagnet phase, the spin singlet phase and the canted antiferromagnet (CAF) phase, depending on the relative strength between the Zeeman energy and interlayer tunneling energy. We present a systematic method to derive the effective Hamiltonian for the Goldstone modes in these three phases. We then investigate the dispersion relations and the coherence lengths of the Goldstone modes. To explore a possible emergence of the interlayer phase coherence, we analyze the dispersion relations in the zero tunneling energy limit. We find one gapless mode with the linear dispersion relation in the CAF phase.Comment: 13 pages, no figures. One reference is added. Typos correcte

Environmental induced renormalization effects in quantum Hall edge states

We propose a general mechanism for renormalization of the tunneling exponents in edge states of the fractional quantum Hall effect. Mutual effects of the coupling with out-of-equilibrium 1/f noise and dissipation are considered both for the Laughlin sequence and for composite co- and counter-propagating edge states with Abelian or non-Abelian statistics. For states with counter-propagating modes we demonstrate the robustness of the proposed mechanism in the so called disorder-dominated phase. Prototypes of these states, such as \nu=2/3 and \nu=5/2, are discussed in detail and the rich phenomenology induced by the presence of a noisy environment is presented. The proposed mechanism justifies the strong renormalizations reported in many experimental observations carried out at low temperatures. We show how environmental effects could affect the relevance of the tunneling excitations, leading to important implications in particular for the \nu=5/2 case.Comment: 14 pages, 4 figure