A Theory of R(D∗,D)R(D^*,D) Anomaly With Right-Handed Currents

We present an ultraviolet complete theory for the $R(D^*)$ and $R(D)$ anomaly in terms of a low mass $W_R^\pm$ gauge boson of a class of left-right symmetric models. These models, which are based on the gauge symmetry $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$, utilize vector-like fermions to generate quark and lepton masses via a universal seesaw mechanism. A parity symmetric version as well as an asymmetric version are studied. A light sterile neutrino emerges naturally in this setup, which allows for new decay modes of $B$-meson via right-handed currents. We show that these models can explain $R(D^*)$ and $R(D)$ anomaly while being consistent with LHC and LEP data as well as low energy flavor constraints arising from $K_L-K_S, B_{d,s}-\bar{B}_{d,s}$, $D-\bar{D}$ mixing, etc., but only for a limited range of the $W_R$ mass: $1.2\, (1.8)~{\rm TeV} \leq M_{W_R}\leq 3~ {\rm TeV}$ for parity asymmetric (symmetric) Yukawa sectors. The light sterile neutrinos predicted by the model may be relevant for explaining the MiniBoone and LSND neutrino oscillation results. The parity symmetric version of the model provides a simple solution to the strong CP problem without relying on the axion. It also predicts an isospin singlet top partner with a mass $M_T = (1.5-2.5)$ TeV.Comment: 43 pages, 7 figures, references added, model slightly modifie

The co-pyrolysis of flame retarded high impact polystyrene and polyolefins

The co-pyrolysis of brominated high impact polystyrene (Br-HIPS) with polyolefins using a fixed bed reactor has been investigated, in particular, the effect that different types brominated aryl compounds and antimony trioxide have on the pyrolysis products. The pyrolysis products were analysed using FT-IR, GC-FID, GC-MS, and GC-ECD. Liquid chromatography was used to separate the oils/waxes so that a more detailed analysis of the aliphatic, aromatic, and polar fractions could be carried out. It was found that interaction occurs between Br-HIPS and polyolefins during co-pyrolysis and that the presence of antimony trioxide influences the pyrolysis mass balance. Analysis of the Br-HIPS + polyolefin co-pyrolysis products showed that the presence of polyolefins led to an increase in the concentration of alkyl and vinyl mono-substituted benzene rings in the pyrolysis oil/wax resulting from Br-HIPS pyrolysis. The presence of Br-HIPS also had an impact on the oil/wax products of polyolefin pyrolysis, particularly on the polyethylene oil/wax composition which converted from being a mixture of 1-alkenes and n-alkanes to mostly n-alkanes. Antimony trioxide had very little impact on the polyolefin wax/oil composition but it did suppress the formation of styrene and alpha-methyl styrene and increase the formation of ethylbenzene and cumene during the pyrolysis of the Br-HIPS

Thermal Analysis of Solar Parabolic Collector Using Goal Programming

Energy is the key input to drive and improve the life cycle. Primarily, it is the gift of the nature to the mankind in various forms. Solar thermal systems play an important role in providing non-polluting energy for domestic and industrial applications. Concentrating solar technologies, such as, parabolic trough collectors are used to supply industrial process heat, off-grid electricity and bulk electrical power. In a Solar ParabolicCollector, the reflective surface focuses sunlight on aa heat collecting element (absorber tube) through which fluid is flows. The fluid captures solar energy in the form of heat that can be used in a variety of applications.In this system the main parts are reflecting surfaces and absorber tube. These arevery important for optimum performance of collector. In the present work the behavior of linear solar parabolic Collector for cooking system is studied and analyzed using a Mathematical model. This model has been simulated with MATLAB program. An experimental design is prepared based on the considered parabolic collector parameters: Absorptivity, Reflectivity and Period of Sun Incidence. The Absorber tube is considered at four levels and the reflective surface is considered at two levels, one is Glass mirror and other is polished aluminum. The experiments are conducted according to the Taguchi design on the solar parabolic collector. During experiments, outlet temperature of water and discharge are recorded for each experimental run. This data is analyzed using Goal Programming and optimal parameter combination has been identified

Neutrino Mixing Predictions of a Minimal SO(10) Model with Suppressed Proton Decay

During the past year, a minimal renormalizable supersymmetric SO(10) model has been proposed with the following properties: it predicts a naturally stable dark matter and neutrino mixing angles theta_atm and theta_13 while at the same time accommodating CKM CP violation among quarks with no SUSY CP problem. Suppression of proton decay for all allowed values of tan beta strongly restricts the flavor structure of the model making it predictive for other processes as well. We discuss the following predictions of the model in this paper, e.g. down-type quark masses, and neutrino oscillation parameters, U_e3, delta_MNSP, which will be tested by long baseline experiments such as T2K and subsequent experiments using the neutrino beam from JPARC. We also calculate lepton flavor violation and the lepton asymmetry of the Universe in this model.Comment: 22 pages, 11 figure

Red light accelerates and melatonin retards metamorphosis of frog tadpoles

BACKGROUND: Earlier studies from this laboratory reported that light and its spectra influence reproduction in the Indian skipper frog Rana cyanophlyctis through both ocular and extra ocular photoreception. During the course of our ongoing studies on chromotactic behaviour of the tadpoles, we noticed that tadpoles held in red light metamorphosed earlier than those held in white or other colours of light. The focus of the present study therefore was to examine the effect of red light on metamorphosis of the tadpoles. RESULTS: Tadpoles, both intact and blind (optectomised), held in red light metamorphosed earlier than those held in white light. Addition of melatonin to aquarium water (5 micrograms/litre) prevented the red light-induced acceleration of metamorphosis both in intact and blinded tadpoles. CONCLUSION: Both ocular and extra-ocular perception of light is involved in red light-induced precocious metamorphosis. Melatonin inhibits the red light-induced acceleration of metamorphosis. The mechanism by which red light accelerates metamorphosis is not yet known. Melatonin counteracts red-light induced acceleration of metamorphosis in this tadpole

Comparing knowledge, attitude, practice and stigma associated with SARS- COV-2 Infection among Healthcare students of Bangalore city: A cross sectional study

Background: In 2020, a new global pandemic has emerged, caused by a new strain of Corona virus called SARS-CoV-2. A poor understanding of the disease among healthcare students may implicate in delayed treatment and rapid spread of infection and development of complications.  Objectives: 1) To estimate the knowledge, attitude, practice and stigma associated with SARS- CoV-2 infection among healthcare students. 2) To estimate the association between socio-demographic determinants with knowledge, attitude, practice and stigma of SARS- CoV-2 infection among healthcare students. Methods: A web-based cross-sectional study was undertaken among 493 healthcare i.e., medical, nursing and allied sciences students, during 1st May to 20th May 2020, using a pre-designed and semi-structured questionnaire. Data was analyzed using Chi square test, t-test, one way Anova and Bonferroni test was used for assessing the association among the study variables. Results: The study revealed that, there were about 225(45.64%) medical, 165(33.46%) nursing and 103(20.89%) allied sciences students. Majority were females 349(70.79%), majority were Hindus 333(67.54%). Mean knowledge score of medical, nursing and allied sciences students were 15.66 (2.518), 14.16 (2.92) and 14.46 (3.11) respectively. Practice score was good among nursing than allied sciences students at ‘p’ (0.003). Conclusion: Even though the overall knowledge was less in our study participants, majority of them had followed good practices for preventing SARS- CoV-2 infection

Radiation and mass transfer effects on an unsteady MHD free convection flow past a heated vertical plate in a porous medium with viscous dissipation

An unsteady, two-dimensional, hydromagnetic, laminar free convective boundary-layer flow of an incompressible, Newtonian, electrically-conducting and radiating fluid past an infinite heated vertical porous plate with heat and mass transfer is analyzed, by taking into account the effect of viscous dissipation. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. Numerical evaluation of the analytical results is performed and graphical results for velocity, temperature and concentration profiles within the boundary layer and tabulated results for the skin-friction coefficient, Nusselt number and Sherwood number are presented and discussed. It is observed that, when the radiation parameter increases, the velocity and temperature decrease in the boundary layer, whereas when thermal and solutal Grashof increases the velocity increases