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Real-Time Implementation of Solar Inverter with Novel MPPT Control Algorithm for Residential Applications  [PDF]
Ayaz Ahmad, Rajaji Loganathan
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.56046
Abstract: Solar energy is a fast growing energy resource among the renewable energy resources in the market and potential for solar power is huge to contribute towards the power demand almost in all the countries. To capture the maximum power from the sun light in order to generate maximum power from the inverter, control system must be an equally efficient with the well designed power electronic circuits. Maximum power point tracking (MPPT) control system in general is taking care of extraction of maximum power from the sun light whereas current controller is mainly designed to optimize the inverter power to feed to power grid. In this paper, a novel MPPT algorithm using neuro fuzzy system is presented to ensure the maximum MPPT efficiency in order to ensure the maximum power across the inverter terminals. Simulation and experimental results for residential solar system with power electronic converters and analysis have been presented in this paper in order to prove the proposed algorithm.
Lie Group Analysis for the Effects of Variable Fluid Viscosity and Thermal Radiation on Free Convective Heat and Mass Transfer with Variable Stream Condition  [PDF]
P. Loganathan, P. Puvi Arasu
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.28080
Abstract: Natural convective boundary layer flow and heat and mass transfer of a fluid with variable viscosity and thermal radiation over a vertical stretching surface in the presence of suction/injection is investigated by Lie group analysis. Fluid viscosity is assumed to vary as a linear function of temperature. The symmetry groups admitted by the corresponding boundary value problem are obtained by using a special form of Lie group transformations viz. scaling group of transformations. An exact solution is obtained for translation symmetry and numerical solutions for scaling symmetry. The effects of fluid viscosity and thermal radiation on the dimensionless velocity, temperature and concentration profiles are shown graphically. Comparisons with previously published works are performed and excellent agreement between the results is obtained. The conclusion is drawn that the flow field and temperature profiles are significantly influenced by these parameters.
On Signed Product Cordial Labeling  [PDF]
Jayapal Baskar Babujee, Shobana Loganathan
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.212216
Abstract: A new concept of labeling called the signed product cordial labeling is introduced and investigated for path graph, cycle graphs, star-K1,n, Bistar-Bn,n, and Some general results on signed product cordial labeling are studied.
Energy Efficient Computation of Data Fusion in Wireless Sensor Networks Using Cuckoo Based Particle Approach (CBPA)  [PDF]
Manian Dhivya, Murugesan Sundarambal, Loganathan Nithissh Anand
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.44030
Abstract: Energy efficient communication is a plenary issue in Wireless Sensor Networks (WSNs). Contemporary energy efficient optimization schemes are focused on reducing power consumption in various aspects of hardware design, data processing, network protocols and operating system. In this paper, optimization of network is formulated by Cuckoo Based Particle Approach (CBPA). Nodes are deployed randomly and organized as static clusters by Cuckoo Search (CS). After the cluster heads are selected, the information is collected, aggregated and forwarded to the base station using generalized particle approach algorithm. The Generalized Particle Model Algorithm (GPMA) transforms the network energy consumption problem into dynamics and kinematics of numerous particles in a force-field. The proposed approach can significantly lengthen the network lifetime when compared to traditional methods.
Effect of Core Thickness and Core Density on Low Velocity Impact Behavior of Sandwich Panels with PU Foam Core  [PDF]
Sunith Babu Loganathan, Hanumanahally Kambada Shivanand
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.33019
Abstract: Composite sandwich structures are highly proven materials that provide high strength to weight ratio. However research works are still being carried out in the area of impact characteristics of sandwich composites. This paper provides a better understanding on the effect of core density and core thickness of sandwich panels subject to low velocity drop test. Specific energy absorption capacity of sandwich panels is obtained and factors affecting the same are explored with facings made of woven glass fiber laminates and polyurethane foam core with three different densities of 70 Kg/m3, 100 Kg/m3, 200 Kg/m3.
Rapid Green Synthetic Protocol for Novel Trimetallic Nanoparticles
B. Karthikeyan,B. Loganathan
Journal of Nanoparticles , 2013, DOI: 10.1155/2013/168916
Abstract: Metallic nanocomposites and nanotubes can be rapidly prepared under microwave irradiation (MW) from an aqueous solution of metallic precursors in the presence of trisodium citrate as a reductant. For the nanotubes nanoparticles are stabilized by poly(N-vinyl-2-pyrrolidone) (PVP), a protecting agent. PVP is a typical capping and structure-directing agent used for the synthesis of various metallic nanostructures. In this work, we have demonstrated for the first time an MW irradiation approach for the synthesis of trimetallic nanocomposites and nanotubes. The resulting nanohybrids were characterized by UV-Vis spectroscopic analysis, high-resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray spectroscopic analysis (EDX), and X-ray diffractometer (XRD) techniques. 1. Introduction Over the past decade there has been an increased emphasis on the topic of green chemistry and chemical processes [1]. Colloidal metallic nanoparticles are emerging as an important family of multifunctional nanoscale materials that assist diverse applications in various fields [2–7]. For these essential applications, a variety of preparation routes have been reported for the syntheses of metallic nanosized particles. In order to increase the efficiency of Pt-based bimetallic and trimetallic nanoparticles catalysts have been prepared [8, 9]. Because, in usual metal catalysts, addition of other element can often improve the catalytic activity and selectivity, from the same viewpoint bimetallic and trimetallic nanoparticles are also often investigated. Trimetallic nanoparticles retain an ever greater degree of catalytic activity than the bimetallic and monometallic ones. However, there have been only few reports of trimetallic nanoparticles in the literature. The reported trimetallic nanoparticles were synthesized by only thermal heating method [10–14]. On the other hand, microwave (MW) dielectric heating is fast emerging as a widely accepted rapid processing technology for a variety of synthesis of nanoparticles. In the MW-assisted syntheses of nanoparticles, we found that MW heating is a rapid technology and it can control the size distribution of the nanoparticles than the conventional heating by thermal convection [15]. In the present work on the preparation of nanosized trimetallic nanocomposites and trimetallic nanotubes from an aqueous solution of corresponding metallic precursors, we have employed trisodium citrate as a reducing agent for the preparation of different combinations of trimetallic nanoparticles and poly(N-vinyl-2-pyrrolidone) (PVP) as a
A Rare Case of Pyoderma Gangrenosum in a HIV Positive Patient
Eswari Loganathan, Asima Banu
Asian Journal of Medical Sciences , 2011, DOI: 10.3126/ajms.v2i2.4029
Abstract: HIV infection can lead to varied spectrum of associated disease conditions. Pyoderma gangrenosum is a neutrophilic dermatosis that may be associated with myeloid malignancies. Less information is available about the association of pyoderma gangrenosum with lymphoid malignancies. We report a rare case of pyoderma gangrenosum in association with Non hodgkins lymphoma(NHL) of diffuse large B cell type. In this case the lesion which showed NHL features occurred in the perianal region, coexisting with pyoderma gangrenosum lesions in the perianal, lower limb and abdominal region. Another interesting feature is the occurrence of both these conditions in a HIV-positive patient with severe immunologic failure to first line antiretroviral therapy contributing to the refractoriness to treatment. Key Words: HIV; pyoderma gangrenosum; Non Hodgkins Lymphoma DOI: http://dx.doi.org/10.3126/ajms.v2i2.4029 Asian Journal of Medical Sciences 2 (2011) 128-130
Sensorless Control of Four-Switch Inverter for Brushless DC Motor Drive and Its Simulation  [PDF]
Sathish Kumar Shanmugam, Meenakumari Ramachandran, Krishna Kumar Kanagaraj, Anbarasu Loganathan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76062
Abstract: The major function of this proposed research is to control the speed of the brushless DC motor with sensor less control for four-switch three phase inverter. This proposed system is simplified the topological structure of the conventional six-switch three phase inverter. In this proposed method, a new structure of four-switch three phase inverter[1]with reduced number of switches for system is introduced to reduce the mechanical commutation, switching losses that occur in thesix-switch method. The proposed inverter fed brushless DC motor used in sensorless controlschemes which is used for sensing positioning signals. To improve sensor less control performance, four-switch electronic commutation modes based proportional intergral controllerscheme is implemented. In this four-switch three phase inverter reduction of switches, low cost control and saving of hall sensor were incorporated. The feasibility of the proposed sensor less control four-switch three phase inverter fed brushless DC motor drive is implemented, analysed using MATLAB/SIMULINK, effective simulation results have been validated out successfully.
Clavicle Hook Depth and Impingement Syndrome—A Cause-Effect Relationship  [PDF]
Senthil Loganathan, Shenbaghavalli Thanikaimalai, Jambu Nageshwaran, Samuel Chittaranjan
Open Journal of Orthopedics (OJO) , 2017, DOI: 10.4236/ojo.2017.71001
Abstract: Background: Clavicular hook plates are effective fixation devices for lateral end clavicle fractures and acromioclavicular joint dislocations and have been extensively used in the last decade. Although this plate achieves a high percentage of union, there are concerns about sub-acromial osteolysis and impingement of supraspinatus tendon. Objective: To show that impingement of supraspinatus tendon can be prevented by measuring the depth between acromion and supraspinatus tendon posteriorly and using hook plates of appropriate depth. Materials and Methods: We performed a prospective study on 25 patients with lateral end clavicle fractures and acromio clavicular joint disruptions by measuring the depth between posterior border of acromion and the superior border of supraspinatus at the point of application of hook plate. Fixation is then done by appropriate sized hook plate. Results: None of the patients had impingement of supraspinatus tendon. Five patients developed subacromial osteolysis which did not have any impact on shoulder function. Conclusion: There is a variation in anatomy of the acromion in different ethnic groups. Hence uniform sized hook plate will be inappropriate. A smaller hook depth is needed in south Asian population to prevent impingement.
Thermophoresis effects on non-Darcy MHD mixed convective heat and mass transfer past a porous wedge in the presence of suction/injection
Loganathan P.,Arasu Puvi P.
Theoretical and Applied Mechanics , 2010, DOI: 10.2298/tam1003203l
Abstract: An analysis is presented to investigate the effect of thermophoresis particle deposition and variable viscosity on non-Darcy MHD mixed convective heat and mass transfer of a viscous, incompressible and electrically conducting fluid past a porous wedge in the presence of suction/injection. The wall of the wedge is embedded in a uniform non-Darcian porous medium in order to allow for possible fluid wall suction or injection. The governing partial differential equations of the problem, subjected to their boundary conditions, are solved numerically by applying an efficient solution scheme for local nonsimilarity boundary layer analysis. Numerical calculations are carried out for different values of dimensionless parameter in the problem and an analysis of the results obtained show that the flow field is influenced appreciably by the applied magnetic field. The results are compared with those known from the literature and excellent agreement between the results is obtained.
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