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D.L. V.,Jyothy Institute of Technology | Guna V.,Jyothy Institute of Technology | Guna V.,Visvesvaraya Technological University | D. M.,Government Sri Krishnarajendra Silver Jubilee Technological Institute | And 2 more authors.
Industrial Crops and Products | Year: 2017

Natural cellulose fibers with properties suitable for textile and other applications have been extracted from the outer layer of Ricinus communis (castor plant) stems. Castor plants are cultivated mainly for their oil seeds but are also found to grow extensively as weeds in marshy and polluted waters. The plant grows up to 40 feet in length with minimum requirement of natural resources. Up to 5–10 times the weight of the oil seeds are left as residue which is generally burnt or buried in the ground. In this research, we studied the potential of using castor plant residues as a source for natural cellulose fibers. Fibers were extracted using a simple alkaline approach and characterized for their morphology, physical structure and tensile properties. Polypropylene was reinforced with castor fibers and made into composites. About 25% of the stem could be obtained as fibers with properties similar to that of fibers from other lignocellulosic plant residues. Individual fibers were fibrillar and exhibited convolutions similar to those seen in cotton. Elongation of the fibers at 5% was higher than common bast fibers jute and flax and the strength at 2.7 g/den (350 MPa) was similar to that of jute but lower than that of cotton. Castor fibers have the properties to be processable as textile fibers and were also found to be suitable as reinforcement for composites. © 2017 Elsevier B.V.

Anandamurthy A.,Jyothy Institute of Technology | Guna V.,Jyothy Institute of Technology | Guna V.,Visvesvaraya Technological University | Ilangovan M.,Jyothy Institute of Technology | Reddy N.,Jyothy Institute of Technology
Journal of Reinforced Plastics and Composites | Year: 2017

Fibrous reinforcements, specifically those derived from agricultural sources, instead of steel make concrete more sustainable and provide unique properties to structures. Organic, inorganic and metallic fibers have been extensively studied as reinforcement and as aggregates for concrete. Steel, glass and carbon in fibrous forms have been used as reinforcement along with concrete or as a separate structure to improve performance or buttress dilapidated structures. Although these traditional materials provide good improvement in properties, they are derived from non-renewable and unsustainable sources. Recent focus has been to use renewable and sustainable materials in concrete instead of the traditional materials such as glass, carbon and steel. A plethora of fibers and fibrous materials, especially those derived from agricultural residues, have the potential to be used in concrete and make concrete structure more sustainable and environmentally friendly. In addition to the different types of fibers, various forms of the same fibers have also been used as reinforcement. Fibers, fabrics, tubes, rods and other structures have been used as reinforcement. In this review, we summarize the various types of fibers used in concrete and discuss the potential of using biofibers derived from agricultural residues as reinforcement and aggregates in concrete. We have broadly grouped the fibers into eight categories and further divided into sub-groups depending on the form of the reinforcement. Major focus has been to cover literature on natural fibers and agricultural residue-based reinforcements. Advantages of using fibrous materials including increase in performance properties have been reviewed. Limitations of the reinforcements and approaches to overcome the limitations have also been discussed. © 2017 SAGE Publications.

Ajjaiah H.B.M.,Gulbarga University | Hunagund P.V.,Gulbarga University | Rajesh Rao B.,Jyothy Institute of Technology
Proceedings of the 2016 IEEE International Conference on Wireless Communications, Signal Processing and Networking, WiSPNET 2016 | Year: 2016

In digital communication system the major obstacle for proper communication is Inter symbol Interference (ISI). An adaptive filter is required to suppress the ISI which is present in the system and to get proper data conduction. This article proposes a new move to adaptive filters in transmission channels using variable step size of LMS (Least Mean Square). The performance of the proposed network is compared with other LMS algorithm based on channel equalizer. The simulation results are observed, the proposed algorithm is better competence of the VSSLMS in the acknowledged data. © 2016 IEEE.

Ram H.R.A.,Jyothy Institute of Technology | Kashyap K.T.,PES Institute of Technology
Transactions of the Indian Institute of Metals | Year: 2014

Precipitation hardening studies were carried out on MWCNT/aluminium alloy 6061 (AA6061) nanocomposites and an increase in the aging kinetics was observed in 2 and 1 wt% MWCNT nanocomposites compared to the base alloy. Transmission electron microscopic studies showed an increase in the dislocation density around the vicinity of MWCNTs due to the thermal mismatch between matrix and the reinforcement. The increase in the dislocation density was theoretically calculated by Arsenault's thermal mismatch model which showed higher dislocation density in 2 wt% MWCNT than in 1 wt% MWCNT nanocomposites compared to the base alloy. The nucleation rate of precipitates as a function of dislocation density was theoretically calculated using Avrami based Dutta and Bourell model in MWCNT/AA6061 nanocomposite assuming dislocation density dependant nucleation. These theoretical results were compared to the aging curves generated by plotting hardness versus aging time. © 2014 Indian Institute of Metals.

Koppad P.G.,PES Institute of Technology | Koppad P.G.,Jawaharlal Nehru Technological University | Aniruddha Ram H.R.,PES Institute of Technology | Aniruddha Ram H.R.,Jyothy Institute of Technology | Kashyap K.T.,PES Institute of Technology
Journal of Alloys and Compounds | Year: 2013

Nickel-coated and uncoated multiwalled carbon nanotube/copper (MWCNT/Cu) nanocomposites with different MWCNT weight fractions were fabricated by powder metallurgy processes and subsequent hot forging. Microstructural characterization by transmission electron microscopy revealed a uniform dispersion of MWCNTs both inside the grains and at the grain boundaries. Increased elastic modulus and hardness, due to incorporation of uncoated and nickel-coated MWCNTs was observed by nanoindentation. The elastic modulus and hardness of the 3 wt.% nickel-coated MWCNT/Cu nanocomposite were increased by 7% and 14% respectively compared to 3 wt.% uncoated MWCNT/Cu nanocomposite. These results provides evidence for the importance of the nickel coating in achieving a good interfacial bond between the MWCNTs and the copper matrix for efficient load transfer during deformation and for the development of high strength composites. The mechanical properties of nanocomposites were theoretically estimated using shear-lag and thermal mismatch model. © 2012 Elsevier B.V. All rights reserved.

Rajaprakash B.M.,University Visvesvaraya College of Engineering | Suresha C.N.,Jyothy Institute of Technology | Upadhya S.,University Visvesvaraya College of Engineering
TMS Annual Meeting | Year: 2015

Friction Stir Welding (FSW) is a solid-state welding technique used for joining metals and alloys to avoid problems associated with fusion welding. Acoustic Emission (AE) has been successfully used to monitor processes like metal cutting, grinding, electron beam welding and FSW. In this work, an attempt has been made to study the application of AE to monitor FSWs to produce defect free welds. During welding of aluminum alloy AA 2024-T3 5mm thick plates, AE signals were acquired. Patterns of AE signals produced during welding are helpful in identifying the defects produced. The lower and higher values of AE parameters help to decide the quality of welded joints. In order to have a better understanding of the behavior of AE parameters when defects were supposed to have occurred during welding, a time domain analysis of AE signals was carried out. The time domain analysis has resulted in justifying the behavior of the AE signals at the instant of occurrence of defects. The range of values of AE parameters, derived from AE signals found to be helpful in monitoring FSW, was accomplished by identifying the time of occurrence of the defect during welding followed by suitable corrective action to produce defect free welds.

Ram H.R.A.,PES Institute of Technology | Ram H.R.A.,Jyothy Institute of Technology | Koppad P.G.,PES Institute of Technology | Kashyap K.T.,PES Institute of Technology
Materials Science and Engineering A | Year: 2013

The nanomechanical behavior of Multiwalled Carbon Nanotubes (MWCNT)/aluminum alloy 6061 (AA6061) nanocomposites was studied for varying volume fractions of MWCNTs by nanoindentation. Nanoindentation testing on the matrix portion with dispersed MWCNTs indicated an increase in Young's modulus by 21% and 22% and an increase in the nanohardness by 43% and 54% by the addition of 1. wt% and 2. wt% copper coated MWCNTs respectively. The microhardness and nanohardness of the nanocomposites were measured and compared. A comparison was made between the experimental values and various theoretical models to correlate Young's modulus of the nanocomposite. © 2012 Elsevier B.V..

Kumar D.N.N.,Jyothy Institute of Technology
Proceedings of 2015 IEEE International Conference on Electrical, Computer and Communication Technologies, ICECCT 2015 | Year: 2015

The work is implemented for remote monitoring and control of greenhouse parameters with the help of sensors and GSM communication. It overcomes the disadvantages of wired and wireless constraints such as complicated wiring, difficult maintenance and distance, to monitor and control the applications. The application will have embedded system which consists of ARM7 microcontroller, real time operating system, sensors, GSM modem and control devices to monitor the environmental parameters condition namely temperature, humidity, CO2 concentration and light intensity in greenhouse. The threshold levels of the sensors will be set with the help of push button keys or remotely via GSM communication mode. By this, environmental parameters in greenhouse can be monitored and controlled manually as well as remotely. The hardware and software modules of the application system are discussed in detail. This embedded application is implemented and tested for its correct functionality. The experimental results show that the developed monitoring system has the following features, such as simple structure, high reliability, good extensibility and flexible configuration. It will control automatically the environmental parameters in every greenhouse and has project practicality and vendibility. © 2015 IEEE.

Uma M.S.,Jyothy Institute of Technology | Madhura K.R.,National College
Advances and Applications in Fluid Mechanics | Year: 2014

The flow of an unsteady incompressible fluid with uniform distribution of dust particles through a narrowing system has been investigated analytically. In the proposed problem, Laplace transform techniques reduce the governing equations to zeroth order Bessel differential equation. The solutions thus obtained are in the form of Bessel functions and yield the velocity distributions of the fluid and dust particles. Expressions for shear stress are obtained for various cases and the solutions are plotted graphically to appreciate the effect of different parameters like Reynolds number, number density and the permeability of the porous medium on the velocity of dust and fluid phase. © 2014 Pushpa Publishing House, Allahabad, India.

PubMed | Bangalore University and Jyothy Institute of Technology
Type: | Journal: Carbohydrate polymers | Year: 2016

This work concerns the investigation of potential candidature of cellulose and chitosan-based nano-sized materials for heavy metals and dyes removal. Cellulose and chitosan being the first two abundant biopolymers in nature offer wide opportunities to be utilized for high-end applications such as water purification. The nano-sized cellulose and nano-sized chitosan present superior adsorption behavior compared to their micro-sized counterparts. This area of research which explores the possible usage of nano-biopolymers is relatively new. The present review article outlines the development history of research in the field of cellulose and chitosan, various methods employed for the functionalization of the biopolymers, current stage of research, and mechanisms involved in adsorption of heavy metals and dyes using nanocellulose and nanochitosan. The significance of research using nano-biopolymers and future prospects are also identified.

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