Dynamical stability of strange quark stars

We show that the mass-radius $(M-R)$ relation corresponding to the MIT bag models of strange quark matter (SQM) and the models obtained by Day et al (1998) do not provide the necessary and sufficient condition for dynamical stability for the equilibrium configurations, since such configurations can not even fulfill the necessary condition of hydrostatic equilibrium provided by the exterior Schwarzschild solution. These findings will remain unaltered and can be extended to any other sequence of pure SQM. This study explicitly show that although the strange quark matter might exist in the state of zero pressure and temperature, but the models of pure strange quark `stars' can not exist in the state of hydrostatic equilibrium on the basis of General Relativity Theory. This study can affect the results which are claiming that various objects like - RX J1856.5-3754, SAX J1808.4-3658, 4U 1728-34, PSR 0943+10 etc. might be strange stars.Comment: 7 pages (including 6 tables and 1 figure) in MNRAS styl

Effect of Seed Priming with Some Plant Leaf Extract on Seedling Growth Characteristics and Root Rot Disease in Tomato

Tomato is one of the important vegetable crops. The problem of seedling establishment is found in tomato due to several soil borne diseases. One of them is root rot caused by Fusarium oxysproum. There are many chemical methods available to control this disease, but use of chemicals deplete the soil micro-environment and causes soil and water pollution and also do not fit within the framework of ‘Organic farming’. Seed priming with certain phytochemicals may be an economic and ecofriendly alternative to such chemicals. In present study we primed tomato seeds with leaf extract of six different plants (White musale, Periwinkle, Neem, Wood apple, Lantana and White cedar). Different leaf extracts of dose of 2% was taken independently for seed priming. We found that priming with White musale, Periwinkle, Neem and wood apple leaf extract had an improvement in different seed and seedling growth parameters in presence of pathogen. Priming with Lantana and white cedar leaf extract showed a reduction in some of the parameters that may be due to allelopathic nature of these plants. Seed priming with leaf extract of Wood apple exhibited maximum survival rate (76.50 %) followed by Neem (68.46 %) and White Musale (52.60 %)

Generalized Electromagnetic fields in Chiral Medium

The time dependent Dirac-Maxwell's Equations in presence of electric and magnetic sources are written in chiral media and the solutions for the classical problem are obtained in unique simple and consistent manner. The quaternion reformulation of generalized electromagnetic fields in chiral media has also been developed in compact, simple and consistent manner

Analysis of MAGSAT data of the Indian region

Progress in the development of software for reading MAGSAT data tapes and for the reduction of anomaly data, and in the preparation of data for magnetic anomaly maps is reported

Quaternion Analysis for Generalized Electromagnetic Fields of Dyons in Isotropic Medium

Quaternion analysis of time dependent Maxwell's equations in presence of electric and magnetic charges has been developed and the solutions for the classical problem of moving charges (electric and magnetic) are obtained in unique, simple and consistent manner

Unified Angular Momentum of Dyons

Unified quaternionic angular momentum for the fields of dyons and gravito-dyons has been developed and the commutation relations for dynamical variables are obtained in compact and consistent manner. Demonstrating the quaternion forms of unified fields of dyons (electromagnetic fields) and gravito-dyons (gravito-Heavisidian fields of linear gravity), corresponding quantum equations are reformulated in compact, simpler and manifestly covariant way

Seasonal fluctuation in the floor component biomass under moist temperate Himalayan forest

The year long mean litter biomass ranged between 1129.0 and 1241.0 g m-2 on the three Quercus species dominated sites. The total quantity of the forest floor also varied from month to month. The lower slope had twice or thrice as much floor biomass as the upper slope

Octonion Quantum Chromodynamics

Starting with the usual definitions of octonions, an attempt has been made to establish the relations between octonion basis elements and Gell-Mann \lambda matrices of SU(3)symmetry on comparing the multiplication tables for Gell-Mann \lambda matrices of SU(3)symmetry and octonion basis elements. Consequently, the quantum chromo dynamics (QCD) has been reformulated and it is shown that the theory of strong interactions could be explained better in terms of non-associative octonion algebra. Further, the octonion automorphism group SU(3) has been suitably handled with split basis of octonion algebra showing that the SU(3)_{C}gauge theory of colored quarks carries two real gauge fields which are responsible for the existence of two gauge potentials respectively associated with electric charge and magnetic monopole and supports well the idea that the colored quarks are dyons