Transport coefficients of heavy baryons

We compute the transport coefficients (drag and momentum diffusion) of the low-lying heavy baryons $\Lambda_c$ and $\Lambda_b$ in a medium of light mesons formed at the later stages of high-energy heavy-ion collisions. We employ the Fokker-Planck approach to obtain the transport coefficients from unitarized baryon-meson interactions based on effective field theories that respect chiral and heavy-quark symmetries. We provide the transport coefficients as a function of temperature and heavy-baryon momentum, and analyze the applicability of certain nonrelativistic estimates. Moreover we compare our outcome for the spatial diffusion coefficient to the one coming from the solution of the Boltzmann-Uehling-Uhlenbeck transport equation and we find a very good agreement between both calculations. The transport coefficients for $\Lambda_c$ and $\Lambda_b$ in a thermal bath will be used in a subsequent publication as input in a Langevin evolution code for the generation and propagation of heavy particles in heavy-ion collisions at LHC and RHIC energies.Comment: 26 pages, 12 figures. Title changed. Small additions and corrections. Version accepted for publication by Physical Review D journa

Navier's slip condition and magnetic field effects on unsteady stagnation point flow subject to a stretched plate along to viscous dissipation and Joule heating utilizing nanofluids

861-876This article mainly addresses Navier's slip boundary condition impact on two-dimensional, unsteady magneto hydrodynamic flow of electrically conducting viscous nanofluids adjacent to stagnation region due to a stretchable wall along to viscous dissipation and Joule heating. Nanofluids are taken namely silver-water, copper-water, titanium dioxide-water and alumina-water. Transformation procedure applied reduces the set of nonlinear partial differential equations into a system of nonlinear ordinary differential equations. Resulting governing boundary layer equations are numerically solved by establishing a Keller-box method. Effects of different nanofluids, stretching parameter, slip parameter; solid volume fraction, unsteadiness parameter, magnetic parameter and Eckert number on velocity and temperature distributions are illustrated via graphs and explained in details. Computational values of local skin friction and local Nusselt number for influences of specified parameters are found out and indicated in tabular mode. Moreover, dual solutions exist by cause of negative values of unsteadiness parameter in fluid flow, fluid temperature, wall shear stress and wall heat flux

Validation of Potential Fishing Zone advisories in Minicoy region of Lakshadweep with special reference to skipjack tuna

Itensive validation programme of Potential Fishing Zone (PFZ) advisories carried ut by the Central Marine Fisheries Research Institute around Minicoy island reealed positive relationship between PFZ and occurrence/abundance of skipjack ma (Katsuwonus pelamis). The usefulness of PFZ advisories for the tuna pole and ne fishing fleet around Minicoy island especially for reducing the searching time 3r tuna shoals and thereby effecting an overall reduction in the cost of fishing oprations is highlighted

Momentum dependence of drag coefficients and heavy flavour suppression in quark gluon plasma

The momentum dependence of the drag coefficient of heavy quarks propagating through quark gluon plasma (QGP) has been evaluated. The results have been used to estimate the nuclear suppression factor of charm and bottom quarks in QGP. We observe that the momentum dependence of the transport coefficients plays crucial role in the suppression of the heavy quarks and consequently in discerning the properties of QGP using heavy flavours as a probe. We show that the large suppression of the heavy quarks observed at RHIC and LHC is predominantly due to the radiative losses. The suppression of $D^0$ in Pb+Pb collisions at LHC energy - recently measured by the ALICE collaboration has also been studied.Comment: Minor changes in the tex

Kinetics of Os (VIII)-catalysed Oxidation of Some ɑ-Amino Acids by Ferricyanide

416-41

Kinetics of Os(VIII)-catalysed Alkaline Hexacyanoferrate(III) Oxidation of Some ɑ-Amino Acids in Presence of Excess of Ferrocyanide

709-71

Application of remote sensing techniques for locating pelagic fish concentrations along the Kerala Coast (SW Coast of India) and Minicoy waters

Intensive validation programme on Potential Fishing Zone (PPZ) forecasts carried out by the MARSIS Centre of Central Marine Fisheries Research Institute, Cochin, at 17 selected fish landing centres along the Kerala coast and around Minicoy Island between November 1995 and May 1997 revealed positive relationship between PPZ and occurrence / abundance of commercially important pelagic tlshes, An attempt is made to identify possible reasons for the above, based on results of oceanographic investigations undertaken in the area and also taking into consideration their behaviour in relation to environment based on past data

Propagation of heavy baryons in heavy-ion collisions

The drag and diffusion coefficients of heavy baryons ($\Lambda_c$ and $\Lambda_b$) in the hadronic phase created in the latter stage of the heavy-ion collisions at RHIC and LHC energies have been evaluated recently. In this work we compute some experimental observables, such as the nuclear suppression factor $R_{AA}$ and the elliptic flow $v_2$ of heavy baryons at RHIC and LHC energies, highlighting the role of the hadronic phase contribution to these observables, which are going to be measured at Run 3 of LHC. For the time evolution of the heavy quarks in the QGP and heavy baryons in the hadronic phase we use the Langevin dynamics. For the hadronization of the heavy quarks to heavy baryons we employ Peterson fragmentation functions. We observe a strong suppression of both the $\Lambda_c$ and $\Lambda_b$. We find that the hadronic medium has a sizable impact on the heavy-baryon elliptic flow whereas the impact of hadronic medium rescattering is almost unnoticeable on the nuclear suppression factor. We evaluate the $\Lambda_c/D$ ratio at RHIC and LHC. We find that $\Lambda_c/D$ ratio remain unaffected due to the hadronic phase rescattering which enable it as a nobel probe of QGP phase dynamics along with its hadronization.Comment: 22 pages, 15 figure

Application of remote sensing techniques for locating pelagic fish concentrations along the Kerala coast (SW coast of India) - work done and future prospects

Intensive validation programme on Potential Fishing Zone forecasts carried out by the MARSIS, Central Marine Fisheries Research Institute, Cochin, at 17 selectedjish landing centres along the Kerala coast between November 1995 and May 1996 revealed a positive relationship betwen PFZ and occurence/abundance of commercially important pelagic fishes. An attempt is made to identify possible reasons for the above, based on results of oceanographic itivestigations undertaken in the area and also taking into consideration fish behaviour in relation to environn-ieni based on past data. Future plans for evolving a suitable prediction system for commercially important pelagic fishes in the coastal waters of the mainland and skipjack fishery in the Lakshadweep islands based on PFZ forecasts are also discussed in view of its importance to the artisanal and small mechanised sector fishermen for reducing the searching time and thereby effecting an overall reduction in the cost of fishing

Silymarin Protects Epidermal Keratinocytes from Ultraviolet Radiation-Induced Apoptosis and DNA Damage by Nucleotide Excision Repair Mechanism

Solar ultraviolet (UV) radiation is a well recognized epidemiologic risk factor for melanoma and non-melanoma skin cancers. This observation has been linked to the accumulation of UVB radiation-induced DNA lesions in cells, and that finally lead to the development of skin cancers. Earlier, we have shown that topical treatment of skin with silymarin, a plant flavanoid from milk thistle (Silybum marianum), inhibits photocarcinogenesis in mice; however it is less understood whether chemopreventive effect of silymarin is mediated through the repair of DNA lesions in skin cells and that protect the cells from apoptosis. Here, we show that treatment of normal human epidermal keratinocytes (NHEK) with silymarin blocks UVB-induced apoptosis of NHEK in vitro. Silymarin reduces the amount of UVB radiation-induced DNA damage as demonstrated by reduced amounts of cyclobutane pyrimidine dimers (CPDs) and as measured by comet assay, and that ultimately may lead to reduced apoptosis of NHEK. The reduction of UV radiation-induced DNA damage by silymarin appears to be related with induction of nucleotide excision repair (NER) genes, because UV radiation-induced apoptosis was not blocked by silymarin in NER-deficient human fibroblasts. Cytostaining and dot-blot analysis revealed that silymarin repaired UV-induced CPDs in NER-proficient fibroblasts from a healthy individual but did not repair UV-induced CPD-positive cells in NER-deficient fibroblasts from patients suffering from xeroderma pigmentosum complementation-A disease. Similarly, immunohistochemical analysis revealed that silymarin did not reduce the number of UVB-induced sunburn/apoptotic cells in the skin of NER-deficient mice, but reduced the number of sunburn cells in their wild-type counterparts. Together, these results suggest that silymarin exert the capacity to reduce UV radiation-induced DNA damage and, thus, prevent the harmful effects of UV radiation on the genomic stability of epidermal cells