Energy and momentum of Bianchi Type VI_h Universes

We obtain the energy and momentum of the Bianchi type VI_h universes using different prescriptions for the energy-momentum complexes in the framework of general relativity. The energy and momentum of the Bianchi VI_h universe are found to be zero for the parameter h = -1 of the metric. The vanishing of these results support the conjecture of Tryon that Universe must have a zero net value for all conserved quantities.This also supports the work of Nathan Rosen with the Robertson-Walker metric. Moreover, it raises an interesting question: "Why h=-1 case is so special?

A new consideration for validating battery performance at low ambient temperatures

Existing validation methods for equivalent circuit models (ECMs) do not capture the effects of operating lithium-ion cells over legislative drive cycles at low ambient temperatures. Unrealistic validation of an ECM may often lead to reduced accuracy in electric vehicle range estimation. In this study, current and power are used to illustrate the different approaches for validating ECMs when operating at low ambient temperatures (−15 °C to 25 °C). It was found that employing a current-based approach leads to under-testing of the performance of lithium-ion cells for various legislative drive cycles (NEDC; FTP75; US06; WLTP-3) compared to the actual vehicle. In terms of energy demands, this can be as much as ~21% for more aggressive drive cycles but even ~15% for more conservative drive cycles. In terms of peak power demands, this can range from ~27% for more conservative drive cycles to ~35% for more aggressive drive cycles. The research findings reported in this paper suggest that it is better to use a power-based approach (with dynamic voltage) rather than a current-based approach (with fixed voltage) to characterise and model the performance of lithium-ion cells for automotive applications, especially at low ambient temperatures. This evidence should help rationalize the approaches in a model-based design process leading to potential improvements in real-world applications for lithium-ion cell

EVALUATION OF PLANT EXTRACTS AGAINST LUNG CANCER USING H460 CELL LINE

Mammalian tumor cells show imperviousness to chemotherapy and its serious symptoms lessens the clinical adequacy of an extensive assortment of anticancer drugs. Plant-derived compounds show numerous valuable impacts and can restrain a few phases of malignancy of cancer. Despite there is paramount progress in cancer therapeutics in the last decades, the need to find, grow new and synergistic plant predicated anticancer specialists are in the developing stage. In the present study, we endeavored to exploit bioactive compounds of two plants viz. Limonia acidissima and Syzygium cumini, investigated their antiproliferative properties for lung cancer and evaluated the haemolytic activity. Methanol extracts of these plants were experimented for cytotoxic activity and found that L.acidissima and S.cumini selectively inhibited H 460 cell proliferation and found that the two plants are non-haemolytic. Our study deduce that the potential bioactive compounds of these plants have vibrant chance to fight lung cancer as were seen to be non-haemolytic to blood cells and they are very much recorded as a traditional medicine for various therapeutic uses

Gravitating dyons and dyonic black holes in Einstein-Born-Infeld-Higgs model

We find static spherically symmetric dyons in Einstein-Born-Infeld-Higgs model in 3+1 dimensions. The solutions share many features with the gravitating monopoles in the same model. In particular, they exist only up to some critical value of a parameter \a related to the strength of the gravitational interaction. We also study dyonic non-Abelian black holes. We analyse these solutions numerically.Comment: Minor modifications, few more references added. To appear in Phys. Lett.

Gravitating dyons and the Lue-Weinberg bifurcation

Gravitating t'Hooft-Polyakov magnetic monopoles can be constructed when coupling the Georgi-Glashow model to gravitation. For a given value of the Higgs boson mass, these gravitating solitons exist up to a critical value of the ratio of the vector meson mass to the Planck mass. The critical solution is characterized by a degenerate horizon of the metric. As pointed out recently by Lue and Weinberg, two types of critical solutions can occur, depending on the value of the Higgs boson mass. Here we investigate this transition for dyons and show that the Lue and Weinberg phenomenon is favorized by the presence of the electric-charge degree of freedom.Comment: RevTeX, 6 pages, 8 figure

A Barren Landscape?

We consider the generation of a non-perturbative superpotential in F-theory compactifications with flux. We derive a necessary condition for the generation of such a superpotential in F-theory. For models with a single volume modulus, we show that the volume modulus is never stabilized by either abelian instantons or gaugino condensation. We then comment on how our analysis extends to a larger class of compactifications. From our results, it appears that among large volume string compactifications, metastable de Sitter vacua (should any exist) are non-generic.Comment: 14 pages, comments adde

Phyto physico-chemical profile of Ashwagandha (Withania somnifera Dunal)

Introduction: The present article deals with study of phytochemical analysis of Withania somnifera Dunal roots. Ashwagandha (Withania somnifera Dunal - Solanaceae), The use of Ashwagandha (WS) is increasing due to a number of chemical constituents present in are found useful for promotion of health. Important bio-active constituents of Ashwagandha root powder are alkaloids, tannins and flavonoid and phenolic compound helps to promote the health benefits. Objective: Evolution of Physico- chemical and phyto chemical analysis of Ashwagandha (WS) powder. Materials and methods: The current investigation deals with extraction and detection or screening of active phytochemical compounds from different extracts of Withania somnifera root. Pharmacognostic studies, Physico-chemical studies, Preliminary phytochemical studies and HPTLC was carried out. Result and conclusion: The result drown were 2% foreign mater was determined. Loss on drying 1.6%, total ash obtained was 9%, acid insoluble ash was 1% and water soluble extractive was 12% and Alcohol soluble extractive was 13%. The phytochemical investigation revealed the presence of various phytochemical constituents such as alkaloids, flavonoids, carbohydrate, Steroids and Saponin Glycoside. HPTLC chromatograms of methanol extracts obtained from root of Withania somnifera revealed that higher quality of with a nolides was present. Hence the root of Withania somnifera was considered to mostly prefer for commercial preparation of drugs

Ayurvedic management of Chirakari Vicharchika (Eczema) : A Case Report

Skin is the largest organ of the body that constitutes the first line of defence and hence is first to be exposed to disease. Among them eczema is one of the most common clinical presentations. With an incidence of 2 -3 % of all medical problems and about 30 percent of all the dermatitis. Eczema is a non-contagious inflammation of the skin, characterised by erythema, scaling, oedema, vesiculation and oozing. In Ayurveda it is correlated with Vicharchika because of similar features like Kandu, Srava, Pidaka. Vicharchika is considered as Kshudra Kushta.[1] In the contemporary science there is no satisfactory treatment available with a lot of side effects and increased rate of recurrence. The unique line of management in Ayurveda helps in removing disease right from its root. Here is a case of Vicharchika (eczema) treated with this thinking to highlight treatment principles