Scaling laws in spherical shell dynamos with free-slip boundaries

Numerical simulations of convection driven rotating spherical shell dynamos have often been performed with rigid boundary conditions, as is appropriate for the metallic cores of terrestrial planets. Free-slip boundaries are more appropriate for dynamos in other astrophysical objects, such as gas-giants or stars. Using a set of 57 direct numerical simulations, we investigate the effect of free-slip boundary conditions on the scaling properties of heat flow, flow velocity and magnetic field strength and compare it with earlier results for rigid boundaries. We find that the nature of the mechanical boundary condition has only a minor influence on the scaling laws. We also find that although dipolar and multipolar dynamos exhibit approximately the same scaling exponents, there is an offset in the scaling pre-factors for velocity and magnetic field strength. We argue that the offset can be attributed to the differences in the zonal flow contribution between dipolar and multipolar dynamos.Comment: 10 pages, 9 figures, 1 table. To appear in ICARU

Mathematical Model Describing Effect of S.Cerella on Paddy in the Environmental Ecosystem

In this paper we will establish a mathematical model with the help of second order differential equations by assuming that the rate of change of percentage germination loss with respect to grain infestation is proportional to germination loss. We have selected entomological data for our problem to be in the paper. The model is useful for better management of storage of grains and it will reduce the storage losses of grains under the consideration of various parameters like moisture, humidity etc. Keywords: Germination loss , Infestation loss , Grains , Storage system etc. DOI: 10.7176/CPER/61-03 Publication date: April 30th 201

PHARMACOGNOSTIC, ETHNOPHARMACOLOGICAL, PHYTOCHEMICAL AND PHARMACOLOGICAL PROFILE OF WILD GUAVA I.E. CAREYA ARBOREA ROXB

Careyaarborea Roxb. is a medium-sized deciduous tree of 9 to 18 m height, surviving throughout India up to an altitude of 1,500 meters and other Asian countries. The tree belongs toFamily Lecythidaceae and has folklore use in treating cold, cough, tumours, asthma, inflammations, ulcers and skin infections. The present review reveals updated, comprehensive and categorized information on pharmacognostical evaluation containing morphology as well as microscopic studies, ethnopharmacology, physiochemical parameters, preliminary photochemical screening, phytochemistry and elaborated pharmacological studies

Formation of starspots in self-consistent global dynamo models: Polar spots on cool stars

Observations of cool stars reveal dark spot-like features on their surfaces. Compared to sunspots, starspots can be bigger or cover a larger fraction of the stellar surface. While sunspots appear only at low latitudes, starspots are also found in polar regions, in particular on rapidly rotating stars. Sunspots are believed to result from the eruption of magnetic flux-tubes rising from the deep interior of the Sun. The strong magnetic field locally reduces convective heat transport to the solar surface. Such flux-tube models have also been invoked to explain starspot properties. However, these models use several simplifications and so far the generation of either sunspots or starspots has not been demonstrated in a self-consistent simulation of stellar magnetic convection. Here we show that direct numerical simulations of a distributed dynamo operating in a density-stratified rotating spherical shell can spontaneously generate cool spots. Convection in the interior of the model produces a large scale magnetic field which interacts with near surface granular convection leading to strong concentrations of magnetic flux and formation of starspots. Prerequisites for the formation of sizeable high-latitude spots in the model are sufficiently strong density stratification and rapid rotation. Our model presents an alternate mechanism for starspot formation by distributed dynamo action.Comment: 14 pages; Important additions in version 2; To appear in A&

Identification of Fast Radio Bursts using Transfer Learning Approach with Data Augmentation

The universe has many mysteries, such as pulsars, dying stars, supernovae, and fast radio bursts (FRBs), FRBs are millisecond long radio signals, detected as a spike in radio-telescope data. Identification of Fast Radio Bursts from available data involves manual inspection of exhaustive data/plots. Radio Frequency Interference in pose a major challenge in identification of Fast Radio Bursts due to their abundance in the observatory data. We present a machine-learning-aided system, which screens telescope-generated data and identifies potential Fast Radio Burst candidates in it. Proposed system employs Convolutional Neural Networks and Transfer Learning to classify potential Fast Radio Bursts from Radio Frequency Interference from data recorded by the uGMRT. We have used data simulation tools to synthesize additional samples in order to make up for the paucity of data. The VGG16-based model displayed the best receiver operating characteristics curve with the area under curve being 0.90 along with an accuracy of 90.67%

Seasonal Variation Of Heavy Metals In Waste Water Sample By Using ICPMS Method District Janjgir-Champa, (C.G.) India.

This paper present to study of the Physico-Chemical parameters of three different areas in Janjgir-Champa District, Chhattisgarh. To determine the amount of pollutants released into the environment and measuring the level of heavy metals and Physico-Chemical characteristics in industrial waste water was conducted. Monsoon and post monsoon changes in physical and chemical parameters such as Temperature, pH, Electrical conductivity, Total solids, Total suspended solids, Dissolved solids and Heavy metals (Pb, Fe, Cr, and Hg). Heavy metals were analyzed by ICPMS Method, Temperature, pH and electrical conductivity was analyzed using the Thermometer, pH scale and Electrical conductometer respectively. The concentration of all heavy metals and Physico-chemical parameters studied were below the reference limits set by BIS (Bureau of Indian standard). The values of heavy metals were (Pb, Cr, Fe, Hg) the maximum value of Pb 0.0036 mg/L at BH-HP in monsoon season and minimum value 0.005 mg/L at NR-HP, and the value of Cr in monsoon season  the maximum value 0.0004 mg/L  at NR-HP and 0.0001 mg/L at BH-HP and the value of Fe the 0.7431 mg/L at NR-HP and minimum value 0.0156 mg/L at BH-HP, while Hg the maximum value 0.00033 mg/L at NR-HP and 0.0011 mg/L at TR-HP. In post monsoon the level of Pb, the maximum value 0.009 mg/L at BH-HP, Cr did not detected.  Fe level maximum value 0.6230 mg/L at NR-HP and minimum value 0.0162 mg/L at BH-HP and Hg maximum value 0.0011 mg/L at NR-HP and minimum 0.0005 mg/L at BH-HP. Therefore, it is recommended to the locals that for notable portable purpose prior treatment is required before human consumption. The results indicate that this particular area is non-polluted and can be used for domestic, irrigation and agricultural purpose