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Search Results: 1 - 10 of 676871 matches for " A. S. Madhusudhan Rao "
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Studies on Thermophysical Properties of CaO and MgO by -Ray Attenuation
A. S. Madhusudhan Rao,K. Narender
Journal of Thermodynamics , 2014, DOI: 10.1155/2014/123478
Abstract: The study on temperature dependent γ-ray attenuation and thermophysical properties of CaO and MgO has been carried out in the temperature range 300?K–1250?K using different energies of γ-beam, namely, Am (0.0595?MeV), Cs (0.66?MeV), and Co (1.173?MeV and 1.332?MeV) on γ-ray densitometer fabricated in our laboratory. The linear attenuation coefficients (μl) for the pellets of CaO and MgO as a function of temperature have been determined using γ-beam of different energies. The coefficients of temperature dependence of density have been reported. The variation of density and linear thermal expansion of CaO and MgO in the temperature range of 300?K–1250?K has been studied and compared with the results available in the literature. The temperature dependence of linear attenuation coefficients, density, and thermal expansion has been represented by second degree polynomial. Volume thermal expansion coefficients have been reported. 1. Introduction Density and thermal expansion are fundamental thermophysical properties of solids. The study of temperature dependence of these properties is very important in understanding the temperature variation of other properties like elastic constants, refractive indices, dielectric constants, thermal conductivity, diffusion coefficients, and other heat transfer dimensionless numbers. Thermal expansion of solids is of technical importance as it determines the thermal stability and thermal shock resistance of the material. In general the thermal expansion characteristics decide the choice of material for the construction of metrological instruments and the choice of container material in nuclear fuel technology. A number of methods have evolved for the determination of density and thermal expansion of solids at high temperature like Archimedean method [1–3], pycnometry [4–8], dilatometry [9–12], electromagnetic levitation [13], method of maximal pressure in gas bubble [14–18], method of sessile drop [19], hydrostatic weighing [20, 21], high temperature electrostatic levitation [22], and gamma ray densitometry [23–34]. Using γ-ray attenuation technique Drotning [23] measured thermal expansion of solid materials at high temperatures. He studied thermal expansion of aluminum and type 303 stainless steel at high temperatures and such studies have been extended by him to study the thermal expansion of metals and glasses in the condensed state [24]. The γ-radiation attenuation technique for the determination of thermophysical properties in the condensed state has several advantages over other methods at high temperatures. This is
A Conventional Approach for the Solution of the Fifth Order Boundary Value Problems Using Sixth Degree Spline Functions  [PDF]
Parcha Kalyani, Patibanda S. Rama Chandra Rao, Ammiraju Sowbhagya Madhusudhan Rao
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.44082
Abstract:


In this communication we have used Bickley’s method for the construction of a sixth order spline function and apply it to solve the linear fifth order differential equations of the form yx(x)+g (x)y(x)= r(x) where g(x) and r(x) are given functions with the two different problems of different boundary conditions. The method is illustrated by applying it to solve some problems to demonstrate the application of the methods discussed.


Spontaneous closure of a traumatic intrarenal pseudoaneurysm
Madhusudhan K,Sharma S,Seth A
Journal of Postgraduate Medicine , 2009,
Abstract: Renal artery pseudoaneurysms caused by blunt abdominal trauma are uncommon. It requires treatment with angioembolization because of high risk of rupture. Spontaneous closure of the pseudoaneurysm is extremely unusual. We report a case of a 29-year-old male who developed a traumatic intrarenal pseudoaneurysm that later resolved spontaneously. This report provides an insight into the natural history of renal pseudoaneurysm and suggests a potential option of managing them conservatively.
Modelling and Analysis of Custom Power Device for Improve Power Quality
Gurrala Madhusudhan Rao
International Journal of Electrical and Computer Engineering , 2011, DOI: 10.11591/ijece.v1i1.41
Abstract: : This paper describes the model and analyzes custom power devices for compensating voltage sag and swell conditions in three phase systems. Faults occurring in power distribution systems or facilities in plants cause the voltage sag or swell. If a fault occurs, it can damage the power system or user’s facility. Sensitivity to voltage sags and swells varies within different applications. For sensitive loads (PLC’s, paper mills etc.), even voltage sags of short duration can cause serious problems in the entire system. Normally, a voltage interruption triggers a protection device, which causes shutdown of the entire system. In order to mitigate power interruptions, this paper proposes a scheme for voltage sag support based on a pulse width modulated autotransformer. The proposed scheme is able to quickly recognize the voltage sag or swell condition, and it can correct the voltage by either boosting the input voltage during voltage sag events or reducing the voltage during swell events.
Mica Filled PVC Composites: Performance Enhancement in Dielectric and Mechanical Properties with Treated/Untreated Mica of Different Particle Size and Different Concentration  [PDF]
S. P. Deshmukh, A. C. Rao
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.112014
Abstract: Polyvinyl chloride (PVC) of different grades is the second most commonly used polymer for fabrication of electric cables and wires after polyethylene. Cables of domestic and industrial use of various capacities are fabricated using different compounds of PVC. Mica is useful particulate filler extensively used to enhance the performance of many polymeric materials. It surface resistance and arc resistance improving its mechanical properties. In the present research work mica filled PVC composites of different concentrations were prepared using untreated and surface treated water ground mica of different particle size. Mica filled PVC composites were compounded for various compositions and test samples were prepared using compression moulding process. These samples were tested for electrical insulation and mechanical properties. The results shows enhancement in dielectric properties with improvement in Young’s modulus, stiffness, reduction in elongation at break and slight increase in shore D hardness of composites. Scanning electron microscopy was used to test the morphology of the samples which has shown proper distributions and adhesion of the filler mica in PVC matrix. There was some effect of surface treatment of mica on its mechanical and dielectric properties of the composite.
Free radical toxicity and antioxidants in Parkinson's disease
Sudha K,Rao A,Rao S,Rao A
Neurology India , 2003,
Abstract: Erythrocyte lipid peroxidation, oxidative hemolysis, erythrocyte antioxidant enzymes, viz. superoxide dismutase, glutathione reductase, glutathione peroxidase, catalase and plasma antioxidants, viz. vitamin A, vitamin E, vitamin C and ceruloplasmin have been determined by spectrophotometric methods in 15 patients with Parkinson's disease (PD) and in 50 controls. Lipid peroxidation, oxidative hemolysis and plasma ceruloplasmin were significantly higher in PD patients as compared to normals. Erythrocyte antioxidants in PD patients were not significantly different from the controls. However, plasma vitamin C in PD patients was significantly lower than the controls. It is concluded that these patients are under oxidative stress which points to a possible involvement of free radicals in PD.
Plasma antioxidant vitamins in brain tumors
Rao G,Rao A,Raja A,Rao S
Neurology India , 2003,
Abstract: Plasma levels of vitamins A, E and C were analyzed in 102 patients with different types of brain tumors. A follow-up study was done with 27 postoperative patients. On comparison with plasma from normal individuals, vitamin A and E were decreased, but the decrease was statistically insignificant. Vitamin C levels remained in the normal range. In a comparative study of preoperative and postoperative cases, plasma vitamin A levels in postoperative glioma patients were significantly higher than those in the pre-operative state. There was no significant difference in the plasma level of vitamins C and E. The results of the present study suggest that the plasma antioxidant vitamins are not altered effectively in brain tumor cases.
Thermophysical Properties of NaCl, NaBr and NaF by γ-Ray Attenuation Technique  [PDF]
Ammiraju Sowbhagya Madhusudhan Rao, Kethireddy Narender, Kalvala Gopal Kishan Rao, Nallacheruvu Gopi Krishna
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.42029
Abstract:

The γ-ray densitometer has been designed and fabricated in our laboratory and carried out studies on temperature dependent γ-ray attenuation and thermo physical properties of NaCl, NaBr and NaF. The linear attenuation coefficients (μl) for the pellets of NaCl, NaBr and NaF as a function of temperature have been determined. The coefficients of temperature dependence of density have been reported. The variation of density and thermal expansion of NaCl, NaBr and NaF in the temperature range of 300 K - 1000 K have been studied and compared with results available in the literature. The temperature dependence of density and thermal expansion has been represented by linear equations. Volume thermal expansion coefficients have been reported.

Temperature Dependence of Density and Thermal Expansion of Wrought Aluminum Alloys 7041, 7075 and 7095 by Gamma Ray Attenuation Method  [PDF]
Kethireddy Narender, Ammiraju Sowbhagya Madhusudhan Rao, Kalvala Gopal Kishan Rao, Nallacheruvu Gopi Krishna
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.43045
Abstract:

The gamma quanta attenuation studies have been carried out to determine mass attenuation coefficients of 7041, 7075 and 7095 wrought aluminum alloys. The temperature dependence of linear attenuation coefficient, density and thermal expansion of these wrought aluminum alloys in the temperature range 300 K - 850 K have been reported. The measurements were done by using a gamma ray densitometer designed and fabricated in our laboratory. The data on variation of density and linear thermal expansion with temperature have been represented by linear equations. Volume thermal expansion coefficients have been reported.

Effect of Thermal Discharge of Cool Water Outfall from Liquefied Natural Gas (LNG) Plant into Sea Using CORMIX  [PDF]
Shivangi Nigam, B. Padma S. Rao, A. Srivastava
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.14001
Abstract:

The numerical modeling for the cool water outfall discharge from the LNG Plant is undertaken using CORMIX to evaluate the design of diffuser for discharge. The hydrodynamic data tide and currents are used inputs to the model. It is then calibrated using monitored data. The software has been run to calculate the mixing zone and dilution patterns for various flow conditions. Model result shows that ambient condition is achieved within 64 m from the proposed outfall locations. From the results of the modeling studies it can be concluded that the proposed diffuser design and outfall locations are suitable for all tide conditions. It also shows that there is no significant impact on the marine life due to the proposed cool water discharge, beyond the small area around the discharge location, as the parameters are attaining near ambient water quality within the acceptable space and time.

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