SUSY QCD Corrections to Higgs-b Production : Is the \Delta_b Approximation Accurate?

The associated production of a Higgs boson with a b quark is a discovery channel for the lightest MSSM neutral Higgs boson. We consider the SUSY QCD contributions from squarks and gluinos and discuss the decoupling properties of these effects. A detailed comparison of our exact order(alpha_s) results with those of a widely used effective Lagrangian approach, the \Delta_b approximation, is presented. The \Delta_b approximation is shown to accurately reproduce the exact one-loop SQCD result to within a few percent over a wide range of parameter space.Comment: figures added, version to be published in Phys Rev

TSUNAMIGENIC SOURCES IN THE INDIAN OCEAN

Based on an assessment of the repeat periods of great earthquakes from past seismicity, convergence rates and paleoseismological results, possible future source zones of tsunami generating earthquakes in the Indian Ocean (possible seismic gap areas) are identified along subduction zones and zones of compression. Central Sumatra, Java, Makran coast, Indus Delta, Kutch-Saurashtra, Bangladesh and southern Myanmar are identified as possible source zones of earthquakes in near future which might cause tsunamis in the Indian Ocean, and in particular, that could affect India. The Sunda Arc (covering Sumatra and Java) subduction zone, situated on the eastern side of the Indian Ocean, is one of the most active plate margins in the world that generates frequent great earthquakes, volcanic eruptions and tsunamis. The Andaman- Nicobar group of islands is also a seismically active zone that generates frequent earthquakes. However, northern Sumatra and Andaman-Nicobar regions are assessed to be probably free from great earthquakes (M!8.0) for a few decades due to occurrence of 2004 Mw 9.3 and 2005 Mw 8.7 earthquakes. The Krakatau volcanic eruptions have caused large tsunamis in the past. This volcano and a few others situated on the ocean bed can cause large tsunamis in the future. List of past tsunamis generated due to earthquakes/volcanic eruptions that affected the Indian region and vicinity in the Indian Ocean are also presented

Haematological abnormalities and pharmacotherapy in severe acute respiratory syndrome corona virus 2

The first case of SARS-CoV-2 (severe acute respiratory syndrome corona virus 2) was reported in Wuhan, China at the end of year 2019. It shows flu-like symptoms, but anosmia, fatigue, persistent cough and loss of appetite, that collectively might spot individuals with COVID-19. The aim of writing this review was to gather the information about blood abnormalities and pharmacotherapy for COVID-19 as a resource for healthcare professionals. A blood workup as well as continuous tracking hematological changes could divulge the risks of disease progression. The indirect indicators such as C-reactive protein (CRP), D-dimer, albumin, ferritin and LDH levels which are used as markers to estimate the severity of COVID-19 infection and prognosis. The most common hematological findings include lymphocytopenia, neutrophilia, eosinopenia, mild thrombocytopenia and less frequently, thrombocytosis. Clinical management includes prophylactic and therapeutic measures. Supportive care including supplemental oxygen and mechanical ventilatory support as and when indicated. Several class of drugs like anti-malarial, anti-viral, anti-inflammatory drugs are being used for the treatment and prevention of COVID-19. The target for development of most of the vaccine for COVID-19 is S protein of the corona virus. Various vaccines available for use across the globe are COVAX, Covishield, Moderna, Johnson and Johnson, Sputnik V, Novavax, Sinopharm, SinoVac. Serial monitoring of hematological manifestations is recommended and the treating doctor should stay vigilant and consider proper screening. The therapeutic intention is to decrease viral load and pharmacological thrombo-prophylaxis in high risk patients

Evaluation of effect of Calotropis gigantea root bark in some animal models of Wister albino rats

Background: Calotropis gigantea is a well-documented traditional medicinal plant useful for many disease conditions. The present study deals with the effect of alcoholic extract of roots bark of Calotropis gigantean in some animal models.Methods: Acute anti-inflammatory activity of root extract was assessed on carrageenin induced paw edema and chronic antiinflammatory activity on cotton pellet granuloma formation in rats and compared with standard diclofenac sodium. Antiasthmatic activity was assessed in histamine and actylcholine induced bronchoconstriction in guinea pigs.Results: 100 and 200 mg/kg p.o. root extract of CG showed significant anti-inflammatory and bronchodilator activity. Antiinflammatory activity was higher than Diclofenac Sodium 50mg/kg. The combination of low dose diclofenac sodium 25mg/kg potentiated the effect. Inhibitory effect on synthesis and release of various inflammatory mediators might contribute to both of these actions. Steroid like phytoconstituents might be responsible for these effects. Further research is needed to understand the exact mechanism behind these effects.Conclusions: In the present study Calotropis gigantea root bark exhibited anti-inflammatory activity in animal models.

Investigation of the Dzyaloshinskii-Moriya interaction and room temperature skyrmions in W/CoFeB/MgO thin films and microwires

Recent studies have shown that material structures, which lack structural inversion symmetry and have high spin-orbit coupling can exhibit chiral magnetic textures and skyrmions which could be a key component for next generation storage devices. The Dzyaloshinskii-Moriya Interaction (DMI) that stabilizes skyrmions is an anti-symmetric exchange interaction favoring non-collinear orientation of neighboring spins. It has been shown that material systems with high DMI can lead to very efficient domain wall and skyrmion motion by spin-orbit torques. To engineer such devices, it is important to quantify the DMI for a given material system. Here we extract the DMI at the Heavy Metal (HM) /Ferromagnet (FM) interface using two complementary measurement schemes namely asymmetric domain wall motion and the magnetic stripe annihilation. By using the two different measurement schemes, we find for W(5 nm)/Co20Fe60B20(0.6 nm)/MgO(2 nm) the DMI to be 0.68 +/- 0.05 mJ/m2 and 0.73 +/- 0.5 mJ/m2, respectively. Furthermore, we show that this DMI stabilizes skyrmions at room temperature and that there is a strong dependence of the DMI on the relative composition of the CoFeB alloy. Finally we optimize the layers and the interfaces using different growth conditions and demonstrate that a higher deposition rate leads to a more uniform film with reduced pinning and skyrmions that can be manipulated by Spin-Orbit Torques

Determination of Arsenic, Mercury and Barium in herbarium mount paper using dynamic ultrasound-assisted extraction prior to atomic fluorescence and absorption spectrometry

A dynamic ultrasound-assisted extraction method using Atomic Absorption and Atomic Flourescence spectrometers as detectors was developed to analyse mercury, arsenic and barium from herbarium mount paper originating from the herbarium collection of the National Museum of Wales. The variables influencing extraction were optimised by a multivariate approach. The optimal conditions were found to be 1% HNO3 extractant solution used at a flow rate of 1 mL min-1. The duty cycle and amplitude of the ultrasonic probe was found to be 50% in both cases with an ultrasound power of 400 W. The optimal distance between the probe and the top face of the extraction chamber was found to be 0 cm. Under these conditions the time required for complete extraction of the three analytes was 25 min. Cold vapour and hydride generation coupled to atomic fluorescence spectrometry was utilized to determine mercury and arsenic, respectively. The chemical and instrumental conditions were optimized to provide detection limits of 0.01ng g-1 and 1.25 ng g-1 for mercury and arsenic, respectively. Barium was determined by graphite-furnace atomic absorption spectrometry, with a detection limit of 25 ng g-1. By using 0.5 g of sample, the concentrations of the target analytes varied for the different types of paper and ranged between 0.4–2.55 µg g-1 for Ba, 0.035–10.47 µg g-1 for As and 0.0046–2.37 µg g-1 for Hg

Graphene Transport at High Carrier Densities using a Polymer Electrolyte Gate

We report the study of graphene devices in Hall-bar geometry, gated with a polymer electrolyte. High densities of 6 $\times 10^{13}/cm^{2}$ are consistently reached, significantly higher than with conventional back-gating. The mobility follows an inverse dependence on density, which can be correlated to a dominant scattering from weak scatterers. Furthermore, our measurements show a Bloch-Gr\"uneisen regime until 100 K (at 6.2 $\times10^{13}/cm^{2}$), consistent with an increase of the density. Ubiquitous in our experiments is a small upturn in resistivity around 3 $\times10^{13}/cm^{2}$, whose origin is discussed. We identify two potential causes for the upturn: the renormalization of Fermi velocity and an electrochemically-enhanced scattering rate.Comment: 13 pages, 4 figures, Published Versio

Performance Analysis of Two Receiver Arrangements for Wireless Battery Charging System

Two different arrangements for Wireless Battery Charging Systems (WBCSs) with a series-parallel resonant topology have been analyzed in this paper. The first arrangement charges the battery by controlling the receiver-side rectifier current and voltage without a chopper, while the second arrangement charges it with a chopper while keeping the chopper input voltage constant. The comparison of these two arrangements is made based on their performance on various figures of merit, such as the sizing factor of both the supply voltage source and receiver coil, overall system efficiency, power-transfer ratio, receiver efficiency, and cost estimation. Later, the simulated study is verified by the experimental setup designed to charge the electric vehicle