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Search Results: 1 - 10 of 333421 matches for " R. V. RAO "
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Software Selection in Manufacturing Industries Using a Fuzzy Multiple Criteria Decision Making Method, PROMETHEE  [PDF]
Intelligent Information Management (IIM) , 2009, DOI: 10.4236/iim.2009.13023
Abstract: This paper presents an effective decision making framework for software selection in manufacturing industries using a multiple criteria decision making method, Preference Ranking Organization Method for Enrichment Evaluations (PROMETHEE). The method is improved in the present work by integrating with analytic hierarchy process (AHP) and the fuzzy logic. Fuzzy logic is introduced to handle the imprecision of the human decision making process. The proposed decision making framework is practical for ranking competing software products in terms of their overall performance with respect to multiple criteria. An example is included to illustrate the approach.
Neuroprotection by Melatonin on Mercury Induced Toxicity in the Rat Brain  [PDF]
Mandava V. Rao, Anshita R. Purohit
Pharmacology & Pharmacy (PP) , 2011, DOI: 10.4236/pp.2011.24049
Abstract: Free radicals are common outcome of normal aerobic cellular metabolism. In-built antioxidant system of body plays its decisive role in prevention of any loss due to free radicals. However, imbalanced defense mechanism of antioxidants and overproduction or incorporation of free radicals from environment to living systems leads to serious damage. It also attacks nervous system resulting in neural-degeneration. In order to evaluate the neurotoxic effect on the brain parts of mercury in our study, oxidative stress indices of enzymatic and non enzymatic components were measured in rats intoxicated with mercury (2 mg and 4 mg/kg body weight) for 60 days to adult rats. Along with gravimetry, tissue burden was also recorded. Alterations in these indices were further supported by ultrastructural studies carried out in the brain as indicated by myelin disintegration, cell organelle alterations and neuronal loss by mercury poisoning. Treatment with the antioxidant melatonin (N-acetyl 5-methoxy tryptamine, 5 mg/kg) prevented mercury exerted toxicity due to its antioxidant property. The pathological changes were also ameliorated in the brain region comparatively to support biochemical profile of brain. Thus, melatonin produced neuroprotection against mercury poisoning in rats.
Effect of Heat Treatment on Tensile and Corrosion Properties of LM6 Hybrid Metal Matrix Composite Reinforced with Cenosphere and Red Mud  [PDF]
Ravi Kumar V., Suresh R., Prakash Rao C. R., Ravi Kumar D. V., Bharat V.
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2019, DOI: 10.4236/jmmce.2019.71001
Abstract: The increased expectation of automotive, aviation and marine industries pertaining to the enhanced properties and their use in elevated temperature conditions and also corrosive environments leads to the development of the newer material to meet the requirements. The requirements of the automobile and marine applications call for the increased mechanical properties and lower density accompanied with higher resistance to oxidation. Hence the present research work is aimed at the development of Hybrid metal matrix composites (HMMCs) using low-density base material and reinforcements. The aluminum of grade LM6 is preferred material in automobile industries, because it can be cast to any complex geometry and possess good machinability, further upon heat treatment, the properties of LM6 alloy can be enhanced to meet the industry requirements. However, requirements of automobile industries consist of increased mechanical properties, lower density and higher corrosion resistance. Hence, in the present research work, it is aimed to develop newer composite material using LM 6 grade Aluminum alloy as matrix material which is reinforced with varied percent Cenosphere and Red mud.
Corrosion Behavior of Cenosphere Reinforced Al7075 Metal Matrix Composite
—An Experimental Approach

Ravi Kumar D. V. ?, Seenappa ?, C. R. Prakash Rao, V. Bharat
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2018, DOI: 10.4236/jmmce.2018.63030
Abstract: Aluminum-based metal matrix composites (MMCs) are considered in several technological applications owing to their enhanced mechanical properties when compared with monolithic metals. Research on the mechanical properties MMCs was done by many researchers; however in depth study on the oxidation behavior of cenosphere, reinforced MMCs are required, since the application of Aluminum-based MMCs is extensively used in applications like automobile, navigation and aviation, where the demand on light weight corrosion resistance material is very much required. In the present work varied compositions of Al7075 grade Aluminum-cenosphere composites use liquid metallurgy route adopting stir casting approach. The experimental study was aimed at experimental investigations of developed composites under different corrosive environments. The corrosion tests were carried out as per ASTM standards. Salt spray test using NaCl was carried out as per ASTM B117 and immersion tests using NaCl and NaOH as corrodents were carried out by following ASTM G31 standards. The results obtained from the tests revealed that as increase in weight % of reinforcement, corrosion resistance increases up to 7.5% reinforcement, and further the corrosion resistance decreases marginally. Solution heat treated samples exhibited higher resistance to oxidation than cast samples in all corrosive environments. The SEM images show the presence of micro cracks and occurrence of pitting corrosion on the corrosion tested specimens.
Contribution to 1-quasi-total Graphs
R.V.N. Srinivasa Rao,J. Venkateswara Rao
Asian Journal of Mathematics & Statistics , 2013,
Abstract: This study illustrate some narrative and remarkable properties of 1-quasi-total graphs. It has been acquired results of various graphs such as regular graphs, complete graphs, complete bipartite, cycles and chromatic number of 1-quasi-total graphs.
Loss Minimization in Radial Distribution System: A Two Stage Method
R. Gowri Sankara Rao,S.V.L. Narasimham,,R. Srinivasa Rao,,A. Srinivasa Rao
International Journal of Engineering Science and Technology , 2011,
Abstract: This paper presents a two stage method for loss minimization of distribution system by cascading reconductoring and reconfiguration. This method gives maximum reduction in power loss with enhanced voltage profile. The efficiency of this method comes from the use of optimal conductor sizes in the first stage and using a heuristic method for network reconfiguration to refine the solution in thesecond stage. A GI algorithm is used to find the optimal conductor sizes and a heuristic method is used to optimize the network configuration. Cost related information is taken from a utility company to represent a realistic scenario. An IEEE 33 bus is considered to demonstrate the effectiveness of the proposedmethod. The results of the proposed method are impressive.
Steady-State and Time-Resolved Fluorescence Studies of Anthrylacrylic Ester  [PDF]
Anil B. Naik, L. R. Naik, V. Jayathirtha Rao, Haridas Pal
Open Journal of Physical Chemistry (OJPC) , 2012, DOI: 10.4236/ojpc.2012.24029
Abstract: The photophysical properties of Anthrylacrylic ester were investigated in various solvents using steady-state and time-resolved fluorescence techniques. The dual fluorescence was observed in various solvents of different polarity functions. The emission bands observed are around 400 nm (band I) and 480 nm (band II) for 350 nm and 390 nm excitation at low concentrations (10–5 mol·dm–3) but at higher concentrations (10–3 mol·dm–3) only the emission (band II) at 480 nm alone was observed. The emission band observed around 400 nm shifts from 390 nm to 420 nm (shift 30 nm) when the excitation wavelength was varied from 300 nm to 380 nm and the emission band at 480 nm shifts from 430 nm to 510 nm (shift 80 nm) for the change of excitation wavelength from 380 nm to 400 nm. However, both emissions were observed for 380 nm excitation at lower concentrations. Solvatochromic shifts of electronic absorption and fluorescence emissions (band I & II) as a function of polarity functions were analyzed and the changes in dipole moment of the molecule was estimated (Δμ = 3.36 D & 5.98 D). Fluorescence decays monitored over each emission maxima showed bi-exponential behavior, and yielded two lifetime components respectively in the range 0.97 - 7.1 ns (at λem = 400 nm) and 0.34 - 7.23 ns (at λem = 480 nm). Based on the steady-state and time-resolved emission measurements emission band I (400 nm) and emission band II (480 nm) are respectively assigned as due to locally excited state (Trans-forms) and due to isomers (Cis-form).
Avalia??o de métodos para estimativa de coeficientes da cultura de amendoim
Silva, Luiz C.;Rao, Tantravahi V. R.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2006, DOI: 10.1590/S1415-43662006000100019
Abstract: the peanut crop with its low water requirement, short growing period and a higher demand, which is not attended by the regional markets, is an important alternative crop to be grown in the irrigated areas of the brazilian northeast, especially in the sandy soils. this paper is concerned with the evaluation of different methods, which determine the water requirements of a peanut crop. the crop water consumption is determined from two evapotranspirometers with constant water table. the reference evapotranspiration is obtained by using different methods. the peanut crop water requirement is in the order of 650 mm and the crop coefficient obtained from the methods of class a pan evaporimeter, hargreaves and thornthwaite, is more adequate for efficient management of irrigation.
On a property of probabilistic context-free grammars
R. Chaudhuri,A. N. V. Rao
International Journal of Mathematics and Mathematical Sciences , 1983, DOI: 10.1155/s0161171283000356
Abstract: It is proved that for a probabilistic context-free language L(G), the population density of a character (terminal symbol) is equal to its relative density in the words of a sample S from L(G) whenever the production probabilities of the grammar G are estimated by the relative frequencies of the corresponding productions in the sample.
A Fixed Point Theorem on Four Self Maps Under Weakly Compatible
V.Srinivas,R.Umamaheshwar Rao
Lecture Notes in Engineering and Computer Science , 2008,
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