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Search Results: 1 - 10 of 146414 matches for " B. Satish Babu "
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Effect of Particulate Reinforcement on the Mechanical Properties of Al2024-WC MMCs  [PDF]
K. Punith Gowda, J. N. Prakash, Shivashankare Gowda, B. Satish Babu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.36049
Abstract: The present work reveals the study of mechanical properties of Al2024-Tungsten carbide MMCs containing tungsten carbide (WC) particulates. The reinforcing particulates in the Al2024 alloy were varied from 0% to 5% by weight. The vortex method of cast production was employed to fabricate the MMCs, in which the reinforcement was poured into the vortex created by stirring the molten metal by means of a mechanical agitator. The composite so produced was subjected to a series of mechanical tests. The results of this study revealed that as the tungsten carbide particle content was increased, there were significant increases in the ultimate tensile strength, hardness and young’s modulus, compressive strength, accompanied by a reduction in its ductility. An attempt is made in the paper to provide explanations for these phenomena.
Implementation of Enhanced Image processing Tool with efficient solutions and Comparisons for Image Smoothing using Fuzzy Filter
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: This paper describes the “Multi Platform Image Processing tool”, using the multi platform language: java. The application is implemented using java’s graphic and Advanced Imaging libraries (“JAI”).The main features are, MDI (Multiple Document Interface) style application, which allow the user the view and edit multiple images simultaneously, Support of the standard image file formats. Saving images in the following formats: JPEG, TIFF, BMP, PNM and PNG. Geometric operations on images: Rotate, Scale, Mirror (flip). ImageEnhancement,Sharpen,Medianfilter,curvefilter,diffusion,gainfilter,grayscalefilter,inverterfilter,quantizerfilter,kelidoscopenfilter,rescalefilter,rgbfilter,threasholdfilterandmanymore.Colordithering,Arithmeticoperationsonimages:Add,Subtract,Divide,Multiply,Image analysis, Edge detection, Adding graphics to images: Lines, Circles and filled circles Rectangles and filled rectangles, Sketching(drawing free handed), Zooming on images: Zoom in Zoom out, Zoom in on selected area.
Vision recovery in human immunodeficiency virus-infected patients with optic neuropathy treated with highly active antiretroviral therapy: A case series
Babu Kalpana,Murthy Krishna,Rajagopalan Nirmala,Satish B
Indian Journal of Ophthalmology , 2009,
Abstract: We describe three patients with bilateral, presumed human immunodeficiency virus (HIV)-induced optic neuropathy. The above diagnosis was made by exclusion of infectious agents and neoplasms by detailed clinical and laboratory investigations. All patients had decreased visual acuity, pale optic discs and constriction of visual fields. Improvement was documented in all three patients for visual acuity and in one patient for visual fields following treatment with highly active antiretroviral therapy (HAART). Optic neuropathy in HIV-positive patients does not necessarily carry a poor prognosis even when a treatable cause is not found. This article emphasizes the effectiveness of HAART in presumed HIV-induced optic neuropathy.
Preparation of Al-5Ti Master Alloys for the In-Situ Processing of Al-TiC Metal Matrix Composites  [PDF]
Satish Babu Boppana, K . Chennakeshavalu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.87049
Abstract: The present paper reports on the preparation of various Al-5Ti master alloys by the reaction of halide salt (K2TiF6) with molten Al in an induction furnace. The master alloys are supposed to be used for the in-situ processing of Al-TiC Metal Matrix Composites. During the preparation of these master alloys the reaction temperature was varied from 800-1000℃ with the intervals of 100℃, while the reaction time was varied at 45, 60 and 75 min. The binary master alloys prepared were characterized using image analyzer and particle size was measured. It was found that the master alloy Al-5Ti prepared at 8000C, and 45 minutes had a minimum particle size of 9.0 micrometer. Also it is observed that the population of particles less than 10 micrometer decreases at higher reaction temperature.
In Situ Synthesis of Titanium Carbide in Pure Aluminium  [PDF]
Satish Babu Boppana
Journal of Materials Science and Chemical Engineering (MSCE) , 2020, DOI: 10.4236/msce.2020.81001
Abstract: The present work reports on the mechanism of formation of TiC in pure Aluminium melt. A halide salt of Al3TiF6, graphite powder and pure Al were used to prepare in situ Al-TiC Metal Matrix Composites (MMCs). Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) were used to determine the microstructural characteristics of the composite. XRD was further used to determine the phases involved in the composite for confirming the formation of TiC. Further to assess the mechanism involved in the in situ reactions, DTA/TGA thermograms were used to analyze the reactions between molten Al, halide salt and graphite powder. Tensile tests were conducted to study the fracture behavior of the in situ prepared MMCs.
Applications of Lindeberg Principle in Communications and Statistical Learning
Satish Babu Korada,Andrea Montanari
Mathematics , 2010,
Abstract: We use a generalization of the Lindeberg principle developed by Sourav Chatterjee to prove universality properties for various problems in communications, statistical learning and random matrix theory. We also show that these systems can be viewed as the limiting case of a properly defined sparse system. The latter result is useful when the sparse systems are easier to analyze than their dense counterparts. The list of problems we consider is by no means exhaustive. We believe that the ideas can be used in many other problems relevant for information theory.
Polar Codes are Optimal for Lossy Source Coding
Satish Babu Korada,Rudiger Urbanke
Mathematics , 2009,
Abstract: We consider lossy source compression of a binary symmetric source using polar codes and the low-complexity successive encoding algorithm. It was recently shown by Arikan that polar codes achieve the capacity of arbitrary symmetric binary-input discrete memoryless channels under a successive decoding strategy. We show the equivalent result for lossy source compression, i.e., we show that this combination achieves the rate-distortion bound for a binary symmetric source. We further show the optimality of polar codes for various problems including the binary Wyner-Ziv and the binary Gelfand-Pinsker problem
Exchange of Limits: Why Iterative Decoding Works
Satish Babu Korada,Ruediger Urbanke
Mathematics , 2008,
Abstract: We consider communication over binary-input memoryless output-symmetric channels using low-density parity-check codes and message-passing decoding. The asymptotic (in the length) performance of such a combination for a fixed number of iterations is given by density evolution. Letting the number of iterations tend to infinity we get the density evolution threshold, the largest channel parameter so that the bit error probability tends to zero as a function of the iterations. In practice we often work with short codes and perform a large number of iterations. It is therefore interesting to consider what happens if in the standard analysis we exchange the order in which the blocklength and the number of iterations diverge to infinity. In particular, we can ask whether both limits give the same threshold. Although empirical observations strongly suggest that the exchange of limits is valid for all channel parameters, we limit our discussion to channel parameters below the density evolution threshold. Specifically, we show that under some suitable technical conditions the bit error probability vanishes below the density evolution threshold regardless of how the limit is taken.
A Class of Transformations that Polarize Symmetric Binary-Input Memoryless Channels
Satish Babu Korada,Eren Sasoglu
Mathematics , 2008,
Abstract: A generalization of Ar\i kan's polar code construction using transformations of the form $G^{\otimes n}$ where $G$ is an $\ell \times \ell$ matrix is considered. Necessary and sufficient conditions are given for these transformations to ensure channel polarization. It is shown that a large class of such transformations polarize symmetric binary-input memoryless channels.
Tight Bounds on the Capacity of Binary Input random CDMA Systems
Satish Babu Korada,Nicolas Macris
Mathematics , 2008,
Abstract: We consider multiple access communication on a binary input additive white Gaussian noise channel using randomly spread code division. For a general class of symmetric distributions for spreading coefficients, in the limit of a large number of users, we prove an upper bound on the capacity, which matches a formula that Tanaka obtained by using the replica method. We also show concentration of various relevant quantities including mutual information, capacity and free energy. The mathematical methods are quite general and allow us to discuss extensions to other multiuser scenarios.
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