Papers

This paper present a compute based method of determining of off-design peek performance characteristics of horizontal axis wind turbine, new method based on analytical approach and an experimental verification based on reading taken from wind farm at Jamgodrani Dewas in Madhya Pradesh located at 76°10'E longitude and 22°59' N latitudes at the height of 560 m above mean sea level. The theoretical method of performance prediction is based different strip theory, in which a blade is divided into 100 radial elements. The blade chord, its twist and its elementary power co-efficient at each station were determined. The iterative process required for the convergence of speed interference factor and for maximization of power coefficient. The design process begins right at maximum power point, rather than searching of point of maximum power and then doing the computations. Analytical approach and an experimental verification of 225kW turbine come out 620.82 kWh and 487.56 kWh power generated respectively.

In the past decade, quality improvement initiatives continue to be established in all service industries like education, banking, healthcare, telecommunication, transportation etc. Such initiatives are necessary as quality improvement programmed is directed towards satisfying the needs and wants of service users. Education like other service industry will also aim to meet the needs and wants of its service users. In this paper the 14 principles of Dr. W. Edwards Deming, which form a framework for the implementation of the Total Quality Management (TQM), are individually applied to the academic environment. The purpose behind this paper is to understand 14 principles of Dr. W. Edwards Deming and their relation with Technical education.
 

A technique for the study of variation of refractive index of liquid has been reported in this paper. The proposed approach is superior to the existing ones because of its significant role in the industry, instrumentation, optical and chemical engineering etc. The fiber optic interferometric refractometer consist of fiber optic probe, a bottom sided fully silver polished plano parallel glass plate, a rectangular temperature controller cell filled with liquid, photodiode detector, and digital millimeters etc. The fiber optic probe is immersed into the measuring liquid. The light from the fiber optic transmitter is coupled into the transmitting fiber. After the multiple reflection of light from the plano parallel glass plate equally distanced narrow and dark fringes are develop in to the reflected region of light. The intensity of fringes is collected by the receiving fiber and forwarded to the detector and digital millimeter. The output intensity is measured by changing the position of fiber optic probe and the measurement carried out for the various concentration of sodium chloride and compared the result.
 

The biochemical content like glycogen was estimated quantitatively in the tissue liver and kidney of control and cadmium chloride treated fish. The experimental fish were exposed to higher and lower sub lethal concentration (one-tenth and one-third of the 96hr LC₅₀ value) of cadmium chloride for 15, 30 and 45 days at 35^oC. In both the tissues a significant reduction in glycogen level has been observed on the 45^th day of exposure using statistical F test.
 

The real and imaginary parts of the complex permittivity of soils of different textures are calculated at a single microwave frequency 9.78 GHz and at room temperature 330C by wave guide cell method. In the view of active and passive microwave remote sensing, penetration depth for the microwaves within the moist soils of different textures is estimated treating uniform soil moisture profile for near surface soil layer. This was observed that penetration depth has the negative correlation with soil moisture content and hardly depends upon the texture at low soil moisture contents (SMC). Penetration depth decreases as clay portion in the moist soil increases and this effect becomes more significant at higher moisture levels. Further, attenuation or power loss per unit length of the moist soils of different textures is also estimated. Power loss per unit length of the moist soil for the microwave propagation increases as the SMC increases. Further, attenuation also depends on the texture of the soil.
 

A set of 90 large geomagnetic storms, associated with D_st (decreases of more than 100 nT) observed during 1997-2007, have been analysed. The analysis included various characteristics features as well as seasonal and solar cycle dependence of these storm events. Out of selected 90 large geomagnetic storm events, 57% are sudden commen-cement type and rest 43% are gradual commencement type. In the present investigation, we have analyzed in detail all halo CMEs occurred during solar cycle 23. On the basis of investigation of 354 halo CMEs and 90 large geomagnetic storms (D_st £ -100 nT), it is concluded that population of halo CMEs and their average speed increases during solar maximum and their occurrence generally follow the phases of solar cycle. Out of selected 90 large geomagnetic storms occurred during solar cycle 23, 56 large geomagnetic storms are associated with halo coronal mass ejections. Long-term variations of flare index variability and global Ap have also been discussed during present analysis.
 

Coal accounts for 50% of total commercial energy supplied in India. The rising demand for coal and the inability of the domestic coal production to meet the demand is a challenging task to improve the productivity and reducing cost. Productivity improvement and cost control have become key objectives of Singareni Collieries Company Limited (SCCL) coal mines in recent years. This paper uses Data Envelopment Analysis (DEA) technique which can aggregate the input and output components in such situations for obtaining an overall performance measure. Selected various coal mines in SCCL and calculated relative efficiencies of mines by using DEA analysis .This paper focus on finding out bench marking of coal mines and ranking of coal mines based on efficiency scores using Constant Return to Scale (CCR) model of DEA analysis. Discussed and analyzed the improvement areas of in-efficient coal mines.

The electronic properties viz. bond ionicity and heat of formation of A^IB^IIIC₂^VI ternary semiconductor compounds with chalcopyrite structure are investigated using Phillips and Van-Vechten's dielectric theory^27-29 of solids. The values of homopolar energy gap, heteropolar energy gap and average energy gap have been evaluated for these materials. Using these parameters, Phillips ionicity of the bonds AC and BC is evaluated and is used to determine the heat of formation (-DH_f) for these materials. The presently investigated values of (-DH_f) are found in good agreement with the experimental data and reported literature values.
 

Paper electrophoresis has been used to determine the stability constants of mixed complexes. The present work is an extension of the method and reports results on a mixed system. Th(IV), Cr(III) and Al(III) - NTA - Valine.

Environmental exposure to man-made electromagnetic fields has been steadily increasing as growing electrical demand; ever-advancing technologies and changes in social behaviors have created more and more artificial sources. This article attempts to present the rationales of devices, which produce electromagnetic radiation and explain the health hazards of electromagnetic radiation exposure. We also present some preventive measures that can reduce the risk of these hazards.