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Preethi, S.
- Synomone mediated behavioural responses of Chrysoperla carnea (Stephens)(Neuroptera: Chrysopidae) to cotton infested by Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)
Authors
1 Project Directorate of Biological Control (ICAR) P. B. No. 2491, H. A. Farm Post, Bellary Road Hebbal, Bangalore 560 024, Karnataka, IN
Source
Journal of Biological Control, Vol 14, No 2 (2000), Pagination: 1-6Abstract
Chrysoperta carnea (Stephens) is considered as an important predator against Helicoverpa armigera (Hii bner) and other sucking pests. The behavioural response of adult of C. carnea to the volatiles of plants infested by H. armigera was studied under laboratory conditions through electroantennogram and olfactometer. The adults showed good electroantennogram response to volatiles from flowers and bolls of cotton infested by H. armigera. Highest response was noticed to tbe infested bolls than flowers and leaves. In zone resident period studies, the adults spent distinctively more time in the zone 6 (nearest to source) when infested bolls were tested. In dual choice methods, significantly more number of adults reached the synomone arm than the control arm, when infested eotton bolls were tested. The response to infested leaves was very poor.Keywords
Chrysoperiu carnea, Electroantennogram, Helicoverpa armigera, Infested Cotton, Synomone, Olfactometer.Full Text
- Behavioural Responses of Key Parasitoids of Opisina arenosella Walker (Lepidoptera:Noctuidae) to the Kairomones
Authors
1 Project Directorate of Biological Control (ICAR), Post Bag No. 2491, H. A. Farm Post, Bellary Road, Hebbal, Bangalore 560024, Karnataka, IN
Source
Journal of Biological Control, Vol 13, No 1&2 (1999), Pagination: 7-14Abstract
Hexane wash of gallery and body of Opisina arenosella Walker elicited positive response from the parasitoids namely Goniozus nephantidis (Muesebeck), Brachymeria nephantidis Gahan and Elasmus nephantidis Rohwer, in terms of more number of parasitoids entering the kairomone arm than hexane arm in 'Y' tube olfactometer. Although, numerically, the gallery wash elicited higher response than larval body wash of the host O. arenosella to G. nephantidis, statistically, the treatments were on par. Chemical analysis of kairomonal substances using GCMS revealed the presence of 13-tetradecenal and myristic acid in the gallery wash, in addition to dodecane, pentadecane, hexadecane, heptadecane, eicosane and tricosane. Larval wash showed terpenoids like alpha-terpinene and alpha humulene.Keywords
Behavioural Responses, Brachymeria nephantidis, Elasmus nephantidis, Goniozus nephantidis, Kairomones, Opisina arenosella.Full Text
- On-Demand Clustering Routing Protocol in Ant-Based Algorithm Using WCDS for MANET
Authors
1 Department of Information Technology in Kongu Engineering College, Perundurai, Tamilnadu, IN
Source
Wireless Communication, Vol 8, No 1 (2016), Pagination: 17-22Abstract
Swarm intelligence is one of the popular approaches that have increased the development of new approaches that can increase the network efficiency. Swarm intelligence imitates the collective behaviour of some biological species to solve the network routing problems. Ant Colony Optimization (ACO) comes under the swarm intelligence approach. This paper aims at increasing the network efficiency by decreasing the overhead required to send the routing packets. Ant Colony Optimization is designed to find a better routing path by continually issuing routing packets (ants) to leave the pheromone information on the path from the source to the destination, so that ACO could maintain the routing path according to the pheromone trail. Weakly Connected Dominating Sets (WCDS) construction scheme is implemented as an auxiliary structure in ACO to cluster network nodes and achieve an efficient packet transmission. The Forward Ant is broadcasted only by the cluster heads thus reducing the overhead required to transmit ant packets. The Backward Ant uses the pseudo-random-proportional-selection strategy to select a best path from source to destination to increase the network efficiency. The performance of this protocol is compared with AODV and it is analyzed in terms of throughput and packet delivery ratio.
Keywords
Ant Colony Optimization, Cluster, Cluster Head, Weakly Connected Dominating Set.
- Design of Control for Low Cost Wind Turbine using Boost Converters
Authors
1 Anna University, Chennai, IN
Source
Programmable Device Circuits and Systems, Vol 5, No 2 (2013), Pagination: 52-54Abstract
A low-cost wind turbine controller is presented based on a standard electric drive circuit. In order to reduce the current of each IGBT and reduce the harmonic current into the grid, a multiple AC-DC-AC full-scale converter which is suitable for high power direct drive wind power generation systems is adopted. The reasons of DC-link voltage fluctuation of the grid-connected converter are analyzed. This allows significant cost savings over current commercially available devices. DC–DC buck/boost converter composed of insulated gate bipolar transistors. As the voltage and frequency of generator output vary along the wind speed change, a dc-dc boosting chopper is utilized to maintain constant dc link voltage. This paper is a study on the control techniques.
- An Approach Towards Failover & Back-Up Recovery Services for Cloud Computing Environment
Authors
1 Department of Computer Science and Engineering, Dr B R Ambedkar Institute of Technology, Port Blair, IN
2 Department of Computer Science and Engineering, Dr B R Ambedkar Institute of Technology, Port Blair, IN
Source
Networking and Communication Engineering, Vol 7, No 9 (2015), Pagination: 396-401Abstract
Technically, Cloud is a network of Servers, offering computing services. Cloud Computing is widely defined as an Internet based Infrastructure/Platform/Software Services that are provisioned to the end users on pay per use basis. In the present scenario, continuous access to information is a must for the smooth functioning of business operations. Proper load balancing and configuration of multiple paths increases the data availability, assists in reducing unnecessary redundant replicas thereby resource consumption, implements failover, and enables scalability. This paper discusses some of the existing fail-over methodologies in cloud computing environment and presents the cost-effective method of private cloud services through efficient fail-over Manager. We performed an experiment on Private Cloud model. Our experiment consists of an application deployed in a Virtual Machine (VM) of a Server A, which is clustered with the Virtual Machine of Server B. The health of both the Servers is monitored by a Fail-over Manager module. The Fail-over Manager monitors the parameters like Availability, Reach-ability, CPU Utilization, Memory Utilization, Packet Errors and Latency and accordingly notifies the Administrator, through a Short Service Message (SMS), whose mobile number is already registered with the manager. The Batch file programmed to make a backup of the hosted application, will be triggered by the Task Scheduler. This helps the Administrator to restore the application at later point of time. This helps us to achieve efficient resource utilization and avoids un-welcome call for the Server Administrators by ensuring a fair allocation and efficient fail-over management of every computing resource.
Keywords
Fail-Over, Load Balancing, Private Cloud, SLA, Virtual Machine, XasaS.- Design and Analysis of PID Controller for Pressurized Water Reactor in Nuclear Power Station
Authors
Source
Programmable Device Circuits and Systems, Vol 8, No 9 (2016), Pagination: 261-263Abstract
The project deals with the tuning of PID controller for pressurized water reactor in nuclear reactor. Conventional method of tuning PID such as Ziegler Nicholas, cohencoon, relay are discussed. In this project, tuning parameters of PID we have also discussed methods like dead time compensation. The positive and negative mismatch is also found for the given transfer function.
Keywords
Tuning of PID- A Comparative Analysis of the Properties of Zinc Oxide (ZnO) Nanoparticles Synthesized by Hydrothermal and Sol-Gel Methods
Authors
1 Department of Physics, Jayaraj Annapackiam College for Women (Autonomous), Periyakulam - 625601. Theni, Tamil Nadu., IN
Source
Indian Journal of Science and Technology, Vol 9, No 40 (2016), Pagination:Abstract
Objective: To study the structural, optical and conductivity properties of ZnO nanoparticles synthesized by two different methods such as hydrothermal and sol-gel methods. Methods/Analysis: ZnO is synthesized at various temperatures 100oC, 150oC and 200oC using hydrothermal method with oxalic acid and zinc acetate and using sol-gel method with sodium hydroxide, zinc chloride and zinc nitrate. Findings: For both methods, the average crystal size determined by X-ray Diffraction (XRD) is noted to be in the range 20–30 nm. The pattern confirmed the composition, crystallinity and the synthesized products are ZnO with high purity and the hexagonal phase. The absorption peak of ZnO nanoparticles has a blue-shift compared with that of the bulk. In hydrothermal method, the band gap is large (i.e) from 4.4–4.9 eV and in the sol-gel method 3.5–3.9 eV. ZnO nanoparticles synthesized by both methods exhibit similar luminescence. Scanning Electron Microscopy (SEM) pictures reveal the morphology as near-spherical prismatic nano particles for hydrothermal method and as nanoflakes for sol-gel method. The Energy Dispersive X-ray Spectroscopy (EDAX) analysis confirms the presence of ZnO only and no other element. The conductivity decreases with the growth temperature as well as the concentration of the ZnO samples by sol-gel method. In contrast, the conductivity of the sample prepared by hydrothermal method, increases with the growth temperature but decreases with the concentration. Novelty: In addition, conductivity of the synthesized ZnO nanoparticles is measured for various concentrations of ZnO. The results of both the methods are compared with each other and with those reported in the literature.Keywords
Conductivity, EDAX, PL, SEM, XRD, ZnO.Full Text
- VLSI Implementation of Brain Tumor Segmentation Using Fuzzy C-Mean Clustering
Authors
1 Department of ECE, KLN College of Information Technology, IN
Source
Networking and Communication Engineering, Vol 9, No 3 (2017), Pagination: 56-58Abstract
Image segmentation is a technique and process which divide the image into different feature of region and extract out the interested target. Segmentation allows extracting objects in images. Medical experts spend a large amount of time in segmenting tumor volume in medical images. The task of image segmentation is actually the partition of an image into a number of non overlapping regions, each with distinct properties. The tumor analysis is done by the use of image segmentation. Tumor of brain will be segmented by use of various methods. The method as fuzzy c mean which is to be used to segment the brain image is proposed. And then the algorithm based on the method of compensation factor method which is to be usually segmenting the brain tumor is implemented. This segmentation process could be effective in the bio-medical applications. For this implementation the algorithm is done in hardware as FPGA. This will be useful for the real time implementation of this process. The hardware as SPARTAN is used and designed by using the software as Xilinx Platform Studio.
Keywords
MRI (Magnetic Resource Imaging), FPGA (Field Programmable Gate Array), SPARTAN 3EDK, Fuzzy C-Mean Clustering.- A Comparative Exploration on Numerical and Experimental Modelling and Optimization of Material Removal Rate in Wire Cut EDM for EN-19 Steel Alloy
Authors
1 Department of Mechanical Engineering Sri Venkateswara College of Engineering & Technology, R.V.S Nagar, Chittoor, IN
Source
Manufacturing Technology Today, Vol 17, No 11 (2018), Pagination: 22-29Abstract
At present scenario the demand for compact, integrated and small size products by a non-traditional process is increased because it gives high accuracy. Machining performance specifications of concern include minimum feature size, tolerance, surface finish, and material removal rate (MRR) and applications of advanced, which is very difficult to machine the materials. Wire cut EDM is an important manufacturing process that meets these demands and it has been widely used in production, aerospace/aircraft, medical, and virtually in all areas of conductive material machining. In the present research work, EN-19 steel alloy is used as work material. Experimentation on WEDM is conducted for modelling the material removal rate. The experimental results are used for determining the more dominant parameter on material removal rate (MRR) using optimization techniques. A numerical analysis is carried out using experimental conditions. In this, a model of work is analyzed and theoretical material removal rate is estimated using finite element analysis (FEA). A comparative study is made between the numerical and experimental results.Keywords
Material Removal Rate (MRR), Wire Cut EDM (WEDM), Factorial Design, Voltage, Current.References
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