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Search Results: 1 - 10 of 435 matches for " Drakshayani Doulat Narendra "
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Studies on the Process Parameters of Rapid Prototyping Technique (Stereolithography) for the Betterment of Part Quality
Raju Bangalore Singe Gowda,Chandra Sekhar Udayagiri,Drakshayani Doulat Narendra
International Journal of Manufacturing Engineering , 2014, DOI: 10.1155/2014/804705
Abstract: Rapid prototyping (RP) has evolved as frontier technology in the recent times, which allows direct transformation of CAD files into functional prototypes where it tremendously reduces the lead time to produce physical prototypes necessary for design verification, fit, and functional analysis by generating the prototypes directly from the CAD data. Part quality in the rapid prototyping process is a function of build parameters such as hatch cure depth, layer thickness, orientation, and hatch spacing. Thus an attempt was made to identify, study, and optimize the process parameters governing the system which are related to part characteristics using Taguchi experimental design techniques quality. The part characteristics can be divided into physical part and mechanical part characteristics. The physical characteristics are surface finish, dimensional accuracy, distortion, layer thickness, hatch cure, and hatch file, whereas mechanical characteristics are flexural strength, ultimate tensile strength, and impact strength. Thus, this paper proposes to characterize the influence of the physical build parameters over the part quality. An L9 orthogonal array was designed with the minimum number of experimental runs with desired parameter settings and also by analysis tools such as ANOVA (analysis of variance). Establishment of experimentally verified correlations between the physical part characteristics and mechanical part characteristics to obtain an optimal process parameter level for betterment of part quality is obtained. The process model obtained by the empirical relation can be used to determine the strength of the prototype for the given set of parameters that shows the dependency of strength, which are essential for designers and RP machine users. 1. Introduction Due to the advances in electronics and computers, there has been a significant growth in communication, information technology, and worldwide networking, which leads to globalization and opening of markets [1, 2]. Thus in product development, rapid prototyping (RP) and rapid product development have turned out to be the key instruments to save time and money with respect to the development of innovative products [2, 3]. Stereolithography (SLA) is one of the RP techniques, which involve fabrication of intricate shape of a plastic monomer directly from computer aided design (CAD) data by depositing material layer by layer by photopolymerization process [4]. The SLA process involves the following steps: conversion of the CAD model to the standard triangulation language (STL) file format; slicing
Experimental Proof of Mass in Photon  [PDF]
Narendra Swarup Agarwal
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65068
Abstract: The present work deals with the mass of photon which creates a force at the contact point of reflection resulting in slight deviation of photon from its path after reflection. Only the mass of photon can cause deviation due to inertial force. If photon has no mass, it cannot deviate. It is also found that this deviation of photon depends on the angle of polarization plane of laser light with respect to reflecting mirror. Such variation in the angle of deviation by the plane of polarization proves that the mass of photon is neither in the centre of photon nor distributed uniformly but located off-centre (away from the centre of photon). This work proves that photon has mass and the most important part of this work is to discover that the mass of the photon is located off-centre (away from the centre of photon). This discovery explains Wave Particle Duality of electromagnetic radiations.
Adaptive Lifting Transform for Classification of Hyperspectral Signatures  [PDF]
Rajesh Agrawal, Narendra Bawane
Advances in Remote Sensing (ARS) , 2015, DOI: 10.4236/ars.2015.42012
Abstract: Supervised classification of hyperspectral images is a challenging task because of the higher dimensionality of a pixel signature. The conventional classifiers require large training data set; however, practically limited numbers of labeled pixels are available due to complexity and cost involved in sample collection. It is essential to have a method that can reduce such higher dimensional data into lower dimensional feature space without the loss of useful information. For classification purpose, it will be useful if such a method takes into account the nature of the underlying signal when extracting lower dimensional feature vector. The lifting framework provides the required flexibility. This article proposes the adaptive lifting wavelet transform to extract the lower dimensional feature vectors for the classification of hyperspectral signatures. The proposed adaptive update step allows the decomposition filter to adapt to the input signal so as to retain the desired characteristics of the signal. A three-layer feed forward neural network is used as a supervised classifier to classify the extracted features. The effectiveness of the proposed method is tested on two hyperspectral data sets (HYDICE & ROSIS sensors). The performance of the proposed method is compared with first generation discrete wavelet transform (DWT) based feature extraction method and previous studies that use the same data. The indices used for measuring performance are overall classification accuracy and Kappa value. The experimental results show that the proposed adaptive lifting scheme (ALS) has excellent results with a small size training set.
Wave Particle Duality & Interference Explained  [PDF]
Narendra Swarup Agarwal
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.73026
Abstract: Photons and elementary particles display the properties of particle as well as of wave known as Wave Particle Duality. Quantum Theory could not explain Wave Particle Duality only due to the belief that photon has no mass and accepted Wave Particle Duality as reality of quantum scale particles. “Experimental Proof of Mass in Photon” [1] discovered Inertial Force developed by the photons on Reflection. This Inertial Force is developed in the spinning photon from inside due to the mass of photon. These experiments also discovered that the centre of mass of photon was different from the centre of photon. Such presence of mass in a photon developing Inertial Force from within the photon gifts special properties to display Wave Particle Duality, Interference and Polarization etc. These phenomena are explained in this work which could not be explained by the Quantum Theory earlier. This work also confirms mass in photon based on both Newtonian and Special Theory of Relativity. New equations of true mass of photon are also derived.
New Quantum Theory Explains All the Mysterious Quantum Phenomena  [PDF]
Narendra Swarup Agarwal
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.715186
Abstract: The photons & the quantum particles display several mysterious Quantum Phenomena which could not be explained earlier. The New Quantum Theory explains not only the long pending Wave Particle Duality but also all other mysterious Quantum Phenomena. The New Quantum Theory is based on the analogy of the atoms & the solar system and not only supplements but also completes the Quantum Theory. This work explains “how & why” a photon, an electron or quanta generates the electric & the magnetic fields of continuously varying intensities & in the changing directions to form a 3-D Electromagnetic wave. The electromagnetic fields generated by the photons/quantum particles interact with the electromagnetic fields of the mediums (conductor, semicon-ductor or insulator etc.) to display several mysterious Quantum Phenomena. These interactions are strong enough to change the spin, wavelength, amplitude & direction of the quantum particles in the medium. The spin-orbit interlocking/interactions, transverse spin, vortex spin texture & evanescent waves etc. are the results of such interactions. This work explains some of the quantum phenomena in brief so that the various Quantum Phenomena can be modified & developed for the different applications.
Discovery & Proofs of a Nucleus of Mass and Charge in the Photons/Quantum Particles  [PDF]
Narendra Swarup Agarwal
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.912137
Abstract: This work discovers and proves that all the photons/quantum particles have a “Nucleus of mass and charge.” The nucleus is located off-center in the particles. The constructive, destructive and intermediate Interference phenomena decisively discover and prove the presence of only one nucleus of the mass located off-center in a photon, like an atomic nucleus. The mass in the nucleus of a photon develops varying forces to move the photon as a wave. The Wave-Particle Duality is the most significant proof of such a nucleus of mass. The formation of an electromagnetic wave by a photon proves the presence of a charge in the nucleus of the photon. The Quantum Theory, developed about 100 years back, simplified the understanding of matter and energy at the atomic/subatomic levels. However, the Quantum Theory remains incomplete and cannot explain even a single quantum phenomenon. The New Quantum Theory, developed in the year 2012, is based on the similarity of an atomic nucleus as well as the solar system with the Sun as its nucleus of the mass and the charge. The New Quantum Theory explains all the Quantum Phenomena and matches with the Classical Mechanics as well as the Theory of Electromagnetism. The experiments described in this work, using high precision instruments, determine the mass, the charge and the diameter of a photon/quantum particle.
The Professional Medical Journal , 2010,
Abstract: To determine the pattern of malarial parasites species in Jacobabad District Sindh. Design: A retrospective observational study.Setting: This study was conducted at District Malarial control Centre Jacobabad with collaboration of pathology Department C.M.C Larkanaand Leishmaniasis / Mosquito Zoology Lab: University of Balochistan Quetta. Period: One year 2005. Patients & Methods: During the studyperiod blood smears were prepared from the suspected cases of malaria. The suspected cases with fever referred from various areas ofJacobabad District by General Practitioners, Basic Health Units, Rural Health Centres and Taluka Hospital were included in the study forconformation of malaria. The parasites were identified by using Giemsa stained thick and thin smears. Results: During the study period total of 58,989 blood smears were examined irrespective of age and sex and were conformed for malarial parasites, giving over all positivity rate of 0.91% (540 cases). Plasmodium falciparum was identified in 154 (28.52%) and Plasmodium vivax in 386 (71.48%) cases. Conclusions: Thepositive cases for malarial parasites were 0.91% and Plasmodium vivax found as most predominant species in the region.
Study the effect of formulation variables in the development of timed-release press-coated tablets by Taguchi design  [PDF]
Chikkanna Narendra, Mayasandra SrinavasaIyengar Srinath
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.24046
Abstract: In this investigation, the effect of formulation variables on the release properties of timed- release press-coated tablets was studied using the Taguchi method of experimental design. Formulations were prepared based on Taguchi orthogonal array design with different types of hydrophilic polymers (X1), varying hydrophilic polymer/ethyl cellulose ratio (X2), and addition of magnesium stearate (X3) as independent variables. The design was quantitatively evalu-ated by best fit mathematical model. The results from the statistical analysis revealed that factor X1, X3 and interaction factors between X1X2 and X1X3 were found to be significant on the re-sponse lag time (Y1), where as only factor X1 was found to be significant on the response percent drug release at 8 hrs (Y2). A numerical optimization technique by desirability function was used to optimize the response variables, each having a different target. Based on the re-sults of optimization study, HPC was identified as the most suitable hydrophilic polymer and incorporation of hydrophobic agent magnesium stearate, could significantly improve the lag time of the timed-release press-coated tablet.
Influence of CdS Nano Additives on the Thermal Conductivity of Poly(vinyl chloride)/CdS Nanocomposites  [PDF]
Dinesh Patidar, Narendra Sahai Saxena
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.21003

PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective thermal conductivity of PVC/CdS nanocomposites has also been done using transient plane source (TPS) method. The effects of concentration of CdS nanoparticles and temperature on the effective thermal conductivity of polymer PVC/CdS nanocomposites have been studied. The variation of effective thermal conductivity with the concentration of filler particles and temperature has also been discussed in terms of dispersion of filler particles into polymer matrix and phonon scattering mechanism, respectively.

TeV scale model for neutrino masses, dark matter and leptogenesis
Sahu, Narendra
High Energy Physics - Phenomenology , 2007, DOI: 10.1063/1.2803818
Abstract: We present a TeV scale model for leptogenesis where the origin of neutrino masses are independent of the scale of leptogenesis. As a result, the model could be extended to explain {\it dark matter, neutrino masses and leptogenesis at the TeV scale}. The most attractive feature of this model is that it predicts a few hundred GeV triplet Higgs scalar that can be tested at LHC or ILC.
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