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Use of Discrete Wavelet Features and Support Vector Machine for Fault Diagnosis of Face Milling Tool

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Structural Durability & Health Monitoring 2018年第2期12卷 111-127页

作者： C.K.Madhusudana n.gangadhar Hemantha Kumar S.narendranath national Institute of Technology Karnataka SurathkalMangalorePin-575025India

This paper presents the fault diagnosis of face milling tool based on machine learning *** machining,spindle vibration signals in feed direction under healthy and faulty conditions of the milling tool are acquired.A set of discrete wavelet features is extracted from the vibration signals using discrete wavelet transform(DWT)*** decision tree technique is used to select significant features out of all extracted wavelet features.C-support vector classification(C-SVC)andν-support vector classification(ν-SVC)models with different kernel functions of support vector machine(SVM)are used to study and classify the tool condition based on selected *** the results obtained,C-SVC is the best model thanν-SVC and it can be able to give 94.5%classification accuracy for face milling of special steel alloy 42CrMo4.

关键词： Fault diagnosis face milling decision tree discrete wavelet transform support vector machine

Glycerol-Based Carbon-SO<sub>3</sub>H Catalyzed Benign Synthetic Protocol for the Acetylation of Alcohols, Phenols and Amines under Solvent-Free Conditions

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Green and Sustainable Chemistry 2013年第2期3卷 122-128页

作者： Katakam n. gangadhar Manneganti Vijay Rachapudi Badari narayana Prasad Bhetala Lakshmi Anu Prabhavathi Devi Centre for Lipid Research Indian Institute of Chemical Technology Hyderabad India

A simple and efficient solvent-free method was developed for the acetylation of alcohols, phenols and amines in excellent yields employing glycerol-based sulfonic acid (-SO3H) functionalized carbon catalyst under environmentally benign reaction conditions. The salient features of this protocol are the short reaction time, ease of product isolation and reusability of the carbon catalyst.

关键词： Acetylation Glycerol-Based Carbon-SO3H Catalyst Solvent-Free Method Alcohols Phenols Amines

Biosorption of Malathion from Aqueous Solutions Using Herbal Leaves Powder

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American Journal of Analytical Chemistry 2011年第8期2卷 37-45页

作者： Tharakeswar Yadamari Kalyan Yakkala gangadhar Battala Ramakrishna naidu Gurijala 不详

Commonly available herbal leaves powder namely Achyranthes aspera (uthareni) and Phyllanthus niruri (nela usiri) are used as biosorbents for the removal of malathion in the present investigation. The efficiency of the biosorbents is tested for the determination of malathion using batch experiments under controlled conditions as a function of pH, contact time, initial malation concentration and the optimization amount of biosorbents. The quantification of malathion in aqueous samples, before and after equilibration with biosorbents is carried out by existing spectrophotometric method based on the oxidation of malathion with excess n-bromosuccinimide (nBS) and Rhodamine B at (?max = 550 nm) is used for the unconsumed nBS. The biosorption capacities are found to be pH dependent. The maximum adsorption is noticed at pH = 6 with a contact time of 120 minutes. Biosorption equilibrium isotherms are plotted for malathion uptake capacity (Qe) against residual malathion concentration (Ce) in solution. The Qe versus Ce sorption isotherms relationship is expressed mathematically by Langmuir and Freundlich models. The removal of malathion using biosorbents Achyranthes aspera (Uthareni) and Phyllanthus niruri (nela usiri) from spiked river water samples are found to be 94% and 96% respectively. The developed eco-friendly potential biosorbents indicate that the present method can be successfully applied for the quantitative determination and removal of malathion from real water samples.

关键词： Biosorption Malathion Achyranthes aspera (Uthareni) and Phyllanthus niruri (nela usiri) Isotherm Models

Remediation of Malathion Contaminated Soil Using Zero Valent Iron nano-Particles

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American Journal of Analytical Chemistry 2012年第1期3卷 76-82页

作者： R. K. Singhal B. gangadhar H. Basu V. Manisha G.R. K. naidu A.V. R. Reddy 不详

In this study, iron nano-particles were used to remediate malathion contaminated soil in the concentration range of 1 - 10 μg?g–1. The zero valent iron nano-particles were prepared by reducing ferric chloride solution with sodium boro- hydride for remediation of the soil. The optimized quantity of iron nano particles was found to be 0.1 g?kg–1 of soil con- taminated with 10 μg?g–1 of malathion. Malathion was determined in the soil after leaching to water at pH 8.2 and fol- lowed by its oxidation with slight excess of n-bromosuccinimide (nBS). The unconsumed nBS was estimated by measuring the decrease in the color intensity of rhodamine B. Degradation product formed during the oxidation of ma-lathion by zero valent iron was monitored by the Attenuated Total Reflectance Fourier Transform Infrared Spectros- copy (ATR-FTIR). The results clearly showed that quantitative oxidation of malathion was achieved within eight min- utes after the addition of zero valent iron nano particles.

关键词： Malathion Zero Valent Iron nano Particle Soil Contamination