Shell Crossing Singularities in Quasi-Spherical Szekeres Models

We investigate the occurrence of shell crossing singularities in quasi-spherical Szekeres dust models with or without a cosmological constant. We study the conditions for shell crossing singularity both from physical and geometrical point of view and they are in agreement.Comment: 10 latex pages, RevTex style, no figure

A study of higher dimensional inhomogeneous cosmological model

In this paper we present a class of exact inhomogeneous solutions to Einstein's equations for higher dimensional Szekeres metric with perfect fluid and a cosmological constant. We also show particular solutions depending on the choices of various parameters involved and for dust case. Finally, we examine the asymptotic behaviour of some of these solutions.Comment: 9 Latex pages, No figure, Revtex styl

The study of gravitational collapse model in higher dimensional space-time

We investigate the end state of the gravitational collapse of an inhomogeneous dust cloud in higher dimensional space-time. The naked singularities are shown to be developing as the final outcome of non-marginally bound collapse. The naked singularities are found to be gravitationally strong in the sense of Tipler .Comment: 6 Latex pages, No figure, Revtex styl

Origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic (Ga,Mn)As: Impurity bands inside the band gap

The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga1-xMnxAs, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p-carriers and d-spin is antiferromagnetic. The negative E0 MCD signal also indicates that the hole-doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga1-xMnxAs.Comment: 13 pages, 3 figure

Emergent Universe with Exotic Matter in Brane World Scenario

In this work, we have examined the emergent scenario in brane world model for phantom and tachyonic matter. For tachyonic matter field we have obtained emergent scenario is possible for closed, open and at model of the universe with some restriction of potential. For normal scalar field the emergent scenario is possible only for closed model and the result is identical with the work of Ellis et al [2], but for phantom field the emergent scenario is possible for closed, open and at model of the universe with some restriction of potential

Rolling Element Bearing Condition Monitoring using Filtered Acoustic Emission

The defect present in the bearing of a rolling element may affect the performance of the rotating machinery and may reduce its efficiency. For this reason the condition monitoring of a rolling element bearing is very essential. So many measuring parameters are there to diagnose the fault in a rolling element bearing. Acoustic signature monitoring is one of them. Every rolling element bearing has its own acoustic signature when it is in healthy condition and when the bearing get defected then there is a change in its original acoustic signature. This change in acoustic signature can be monitored and analyzed to detect the fault present in the bearing. But the noise present in the acquired acoustic signal may affect the analysis. So the noisy acoustic signal must be filtered before the analysis. In this work the experiment is performed in two stages. In first stage the filtration of the acquired acoustic signal is done by employing the active noise cancellation (ANC) filtering techniques. In second stage the filtered signal is used for the further analysis. For the analysis initially the static analysis is done and then the frequency and the time-frequency analysis is done to diagnose the defect in the bearing. From all the three analysis the information about the defect present in the bearing is well detected

Density Evolution in the New Modified Chaplygin Gas Model

In this paper, we have considered new modified Chaplygin gas (NMCG) model which interpolates between radiation at early stage and $\Lambda$CDM at late stage. This model is regarded as a unification of dark energy and dark matter (with general form of matter). We have derived the density parameters from the equation of motion for the interaction between dark energy and dark matter. Also we have studied the evolution of the various components of density parameters.Comment: 6 Latex pages, 4 figures, RevTex styl

Correspondence between Electro-Magnetic Field and other Dark Energies in Non-linear Electrodynamics

In this work, we have considered the flat FRW model of the universe filled with electro-magnetic field. First, the Maxwell's electro-magnetic field in linear form has been discussed and after that the modified Lagrangian in non-linear form for accelerated universe has been considered. The corresponding energy density and pressure for non-linear electro-magnetic field have been calculated. We have found the condition such that the electro-magnetic field generates dark energy. The correspondence between the electro-magnetic field and the other dark energy candidates namely tachyonic field, DBI-essence, Chaplygin gas, hessence dark energy, k-essenece and dilaton dark energy have been investigated. We have also reconstructed the potential functions and the scalar fields in this scenario.Comment: 11 pages, 7 figure

CLINICAL EVALUATION OF APAMARGA PRATI-SHARANIYA (TEEKSHNA) KSHARA (LOCAL APPLICATION) HARITAKI CHURNA IN THE MANAGEMENT OF ARSHA (HEMORRHOIDS)

Arsha (Hemorrhoids) is one of the most common conditions affecting peoples since time immemorial. The prevalence is equal in both sexes, peaks between the ages of 45 and 65 and declining thereafter. The main cause of hemorrhoids is constipation over a prolonged period of time and has to strain to pass stools, it can damage the lining of anal canal. Sushruta the Father of Surgery advocated four method of treatment of Arsha, which are Bheshaja, Kshara, Agni and Shastra. Under Sushrutas operative procedure local application of Pratisharaniya Kshara in the prolapse piles mass helps to reduce pile mass effectively (Ref.Su.Chi.6). It is safe, cheap, effective, simple, easily approachable procedure and ambulatory treatment and the patients acceptability is good to overcome such problem. Aims & Objective is to evaluate the clinical efficacy of Apamarga Pratisharaniya teekshna kshara in the management of Arsha. & to evaluate the safety of Apamarga Pratisharaniya teekshna kshara in the management of Arsha. Material and Methods: 30 patients were enrolled for the study within a period of one year and Teekshna pratisharaniya kshara was applied on piles mass intra anally under operative procedure with the help of a instrument proctoscope. Observation and result: Reduction in the piles mass evident by Inspection/ proctoscopy /Visual perception was observed remarkably.Bleeding and pain were also reduced remarkably in all the piles patient. 100% relief in bleeding, reduction of pile mass and total reduction in size of pile mass was recorded. Conclusion: Recently these Oldest technique advocated by Sushruta have been proven to be most effective and free from post-operative complications