Gravity and Large Extra Dimensions

The idea that quantum gravity can be realized at the TeV scale is extremely attractive to theorists and experimentalists alike. This proposal leads to extra spacial dimensions large compared to the electroweak scale. Here we give a very systematic view of the foundations of the theories with large extra dimensions and their physical consequences.Comment: 26 pages, 3 diagram

Analysis of Factors Responsible For of Work Stress In Chemical Industries In Kerala, India

This study examines the influence of factors responsible for work stress among the employees in the chemical industries in Kerala, India. The sample size of the subjects selected for the study consists of 75 Engineers, 110 Supervisors and 675 Workers in the selected chemical industries in kerala ,India. Seven factors were identified with the existing literatures, and in consultation with safety experts for the evaluation of work stress. The instrument developed by using these factors had validity, unidimensionality and reliability. The response rate was 81.3%. It is observed that existence the factors responsible for work stress among all the categories of employees in these industries

Supernovae as Probes of Extra Dimensions

Since the dawn of the new millennium, there has been a revived interest in the concept of extra dimensions.In this scenario all the standard model matter and gauge fields are confined to the 4 dimensions and only gravity can escape to higher dimensions of the universe.This idea can be tested using table-top experiments, collider experiments, astrophysical or cosmological observations. The main astrophysical constraints come from the cooling rate of supernovae, neutron stars, red giants and the sun. In this article, we consider the energy loss mechanism of SN1987A and study the constraints it places on the number and size of extra dimensions and the higher dimensional Planck scale.Comment: 5 pages, no figures, new references are adde

Potential analysis of sunspot parameters and behaviour of random noise

Changes in solar magnetic field are responsible for initialisation and maintenance of different solar processes. Sunspots are clear manifestations of field variations and are good indicators of solar activity. Nature of activity can be well understood by analyzing the underlying sunspot dynamics. Techniques of potential analysis are used in this paper to investigate sunspot numbers and sunspot area, during the period 1875-2012, for finding out their stochastic behaviour. The presence of instabilities in the time series of sunspot numbers and sunspot area are examined in detail. The level of instability in sunspot numbers was observed to be maximum in the years 1953-1955, while that in sunspot area was maximum during 1887-1889. This study also concludes that random noise has a greater effect on dynamics of sunspot area than that on dynamics of sunspot numbers. Presence of high level of noise is noticed in both parameters during 1923-1925. Effect of random noise on the dynamics of sunspot number and area was shown to be very high during the years close to sunspot minima. Results reported can be helpful in predicting evolution of solar activity, which would be crucial in understanding solar-terrestrial phenomena

The Significant Role of CO and NOx in the Tropospheric Ozone Chemistry

Ozone being a greenhouse gas, the chemistry of ozone in the troposphere is considered as an emerging area of investigation after global warming became a reality. The potential role of ozone and its dynamics that changes the atmospheric composition can be retrieved only with the aid of photochemical processes involved in the atmosphere. The various possible chemical reactions that take place at different locations in the atmosphere can significantly change the weather pattern. This is an attempt to review some of the prominent features of the photochemistry of the troposphere and stratosphere

Variation of CO Column over North Kerala by Exploring MOPITT Data

Carbon Monoxide (CO) is one of the prominent pollutant species mainly produced from of fossil fuel burning and motor vehicles. Being a toxic trace gas, it can considerably affect human health. The rapid increase in CO enhances the production of surface ozone which contributes to global warming. This is the first attempt to retrieve the increase in CO over a column of atmosphere up to 100 mb pressure from the surface using MOPITT version 3 of level 2 data. The increase in column abundance of CO observed is correlated with the increase in vehicles in this region and it gives a positive correlation for the four years of observation from 2004. The prominence of this location of north Kerala is that no major industries are sited within this region and the increase in pollution is solely due to anthropogenic activities.ÂÂ