Exact solution of Calogero model with competing long-range interactions

An integrable extension of the Calogero model is proposed to study the competing effect of momentum dependent long-range interaction over the original {1 \ov r^2} interaction. The eigenvalue problem is exactly solved and the consequences on the generalized exclusion statistics, which appears to differ from the exchange statistics, are analyzed. Family of dual models with different coupling constants is shown to exist with same exclusion statistics.Comment: Revtex, 6 pages, 1 figure, hermitian variant of the model included, final version to appear in Phys. Rev.

Culture and regeneration of mesophyll-derived protoplasts of sorghum [Sorghum bicolor (L.) Moench]

A protocol for plant regeneration from mesophyll/protoplasts of sorghum [Sorghum bicolor (L.) Moench] was developed. The yield of intact protoplasts, their subsequent divisions and regeneration were genotype-dependent. The genotype 296B was always more responsive than IS 32266. For 296B, the sixth leaf from 18-day-old plants kept in dark for 2 days before harvesting was found to be the most suitable source of viable protoplasts. The first division was observed 10–12 days after plating, and the second division after 12–14 days. The maximum plating efficiency was 4.8% in 296 B, followed by 2.48% in IS 32266. Microcolonies were visible after 25–30 days, and microcalli after 60–75 days. Whole plants were obtained after 6–8 weeks of culture of microcalli on MS medium containing 0.2 mg l–1 kinetin and 2 mg l–1 BAP. The frequency of regeneration in 296B and IS 32266 was 12.80% and 10.58%, respectively. Ten plants transferred to pots in the glasshouse established well. The seeds collected from glasshouse-grown plants were sown in the field where plants were grown to maturity

STM conductance of Kondo impurities on open and structured surfaces

We study the scanning tunneling microscopy response for magnetic atoms on open and structured surfaces using Wilson's renormalization group. We observe Fano resonances associated with Kondo resonances and interference effects. For a magnetic atom in a quantum corral coupled to the confined surface states, and experimentally relevant parameters, we observe a large confinement induced effect not present in the experiments. These results suggest that the Kondo screening is dominated by the bulk electrons rather than the surface ones.Comment: 6 pages, 6 figure

Effect of Phosphine and Methyl Bromide Fumigation of Different Life Stages of Peanut Bruchid, Caryedon serratus Olivier

To ensure seed quality, peanut seeds received for export by the Plant Quarantine Unit of the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) were subjected to phosphine and methyl bromide fumigation. Effective control of eggs, larvae, and adults of Caryedon serratus Olivier was achieved with methyl bromide vacuum fumigation (16 g/m3 for 4 h exposure). Under normal atmospheric pressure (NAP), phosphine fumigation @ 0.5,1.0, and 2.0 g a.I./m3 for 24, and also with 0.25 g a.l. for 72 h gave effective control of eggs and larvae. Ph~phlne (1.0 g a.l./40 kg burlap bag) with bruchld Infested pods for 120 h resulted in 100% larval and 93% adult mortality. Both the fumigants did not impair the viability of peanut seeds. A dosage of 16 g/m3 of methyl bromide for 4 h under vacuum or 0.25 g a.l./m3 of phosphine for 72 h under NAP or placing 1.0 g a.l. of ph~phlne in dry pods stored in 40 kg burlap bag covered with polythene sheets for 120 h can satisfy the seed health requirements

In-orbit Performance of UVIT on ASTROSAT

We present the in-orbit performance and the first results from the ultra-violet Imaging telescope (UVIT) on ASTROSAT. UVIT consists of two identical 38cm coaligned telescopes, one for the FUV channel (130-180nm) and the other for the NUV (200-300nm) and VIS (320-550nm) channels, with a field of view of 28 $arcmin$. The FUV and the NUV detectors are operated in the high gain photon counting mode whereas the VIS detector is operated in the low gain integration mode. The FUV and NUV channels have filters and gratings, whereas the VIS channel has filters. The ASTROSAT was launched on 28th September 2015. The performance verification of UVIT was carried out after the opening of the UVIT doors on 30th November 2015, till the end of March 2016 within the allotted time of 50 days for calibration. All the on-board systems were found to be working satisfactorily. During the PV phase, the UVIT observed several calibration sources to characterise the instrument and a few objects to demonstrate the capability of the UVIT. The resolution of the UVIT was found to be about 1.4 - 1.7 $arcsec$ in the FUV and NUV. The sensitivity in various filters were calibrated using standard stars (white dwarfs), to estimate the zero-point magnitudes as well as the flux conversion factor. The gratings were also calibrated to estimate their resolution as well as effective area. The sensitivity of the filters were found to be reduced up to 15\% with respect to the ground calibrations. The sensitivity variation is monitored on a monthly basis. UVIT is all set to roll out science results with its imaging capability with good resolution and large field of view, capability to sample the UV spectral region using different filters and capability to perform variability studies in the UV.Comment: 10 pages, To appear in SPIE conference proceedings, SPIE conference paper, 201

Effect of phosphine and methyl bromide fumigation on eggs and larvae of rise moth corcyra cephalonica s. a common stored grain pest

Among the insect pests that attack stored groundnut, rice moth Corcyra ~ephalonica Stainton is most important- It is polyphagous in nature and cosmopolitan in distribution. .Its ability to develop at low humidities ( < 20 "/, RH) may account for its prevalence in the semi-arid tropics (SAT) over other stored product lep.idopterous pests (Dick, 1987)- The irifestation in groundnut results in both qualitative and quantitative losses. C. cephalonica is the most co.mrnon insect pest, often encountered during the visual examination of seed samples meant for export. Though this species is cosn~opolitan in distribution and has attained economic importance in several crops, very limited work has been done with respect to its control by fumigation. Hence this study was undertaken to evolve effective, easy, and economic fumigation schedule to control this pest to ensure better sanitation of outgoing seed

Unsteady flow of a nanofluid over a sphere with nonlinear Boussinesq approximation

A theoretical study is presented of transient mixed convection boundary layer flow of a nanofluid in the forward stagnation region of a heated sphere which is rotating with time dependent angular velocity. The effect of the non-linear Boussinesq approximation is taken into account. The nanofluid is treated as a two-component mixture i.e. nano-particles distributed homogenously in a base fluid (water or gas). The effects of the Brownian motion and thermophoresis are included for the nanofluid and constant wall temperature is imposed at the sphere surface. The first and second laws of thermodynamics are employed in order to study thermophysics as well as heat and mass transfer phenomena. By introducing appropriate similarity variables the governing equations are transformed into a system of dimensionless, nonlinear, coupled, ordinary differential equations which are solved numerically by applying the second-order accurate implicit finite difference Keller box method. The reliability and efficiency of the obtained numerical results are validated via comparison with the previously published results for special cases. The effects of various parameters on primary and secondary velocities, temperature, nanofluid volume fraction (concentration), primary and secondary shear stress functions, Nusselt number function (wall heat transfer rate) and Sherwood number function (wall nanoparticle mass transfer rate) are visualized. Furthermore the influence of non-linear temperature parameter, Brinkman parameter (ratio of Brinkman number to dimensionless temperature ratio), local Reynolds number and unsteadiness parameter on entropy generation number is computed. A strong elevation in entropy generation number is computed with both increasing Brinkman parameter and unsteadiness parameter. Primary and secondary surface shear stresses, Nusselt number and Sherwood number also increase with unsteadiness and rotation parameters. Primary shear stress is boosted with increasing mixed convection parameter and Brownian motion effect whereas secondary shear stress is depressed. Temperatures are suppressed with increasing nonlinear temperature parameter whereas nano-particle concentrations are elevated. Increasing thermophoresis parameter enhances both temperatures and nano-particle concentration values. The simulations find applications in rotating chemical engineering mixing systems and nano-coating transport phenomena

Survival and residence times in disordered chains with bias

We present a unified framework for first-passage time and residence time of random walks in finite one-dimensional disordered biased systems. The derivation is based on exact expansion of the backward master equation in cumulants. The dependence on initial condition, system size, and bias strength is explicitly studied for models with weak and strong disorder. Application to thermally activated processes is also developed.Comment: 13 pages with 2 figures, RevTeX4; v2:minor grammatical changes, typos correcte