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Search Results: 1 - 10 of 361 matches for " Ramasamy Devaraj "
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Synthesis and properties of ZnO nanorods by modified Pechini process
Ramasamy Devaraj,Krishnamoorthy Karthikeyan,Kadarkaraithangam Jeyasubramanian
Applied Nanoscience , 2013, DOI: 10.1007/s13204-012-0072-1
Abstract: Zinc oxide (ZnO) nanorods have been successfully synthesized by modified Pechini process. The as-synthesized ZnO nanorods were characterized by X-ray diffraction, scanning electron microscope, Raman spectrum, ultraviolet–visible (UV–vis) spectrum. X-ray diffraction result shows that the ZnO nanorods are oriented in wurtzite phase. Raman spectroscopy measurements revealed the presence of E2 (high) mode at 437 cm 1 indicating the high crystallinity of the as-synthesized ZnO nanorods. The optical property of the ZnO nanorods were studied from their UV–vis spectroscopy analysis which exhibits the absorbance at 373 nm corresponds to the Zn–O absorption. A mechanism for modified Pechini process for the synthesis of ZnO nanorods using citric acid–ethylene glycol precursor has also been proposed.
Comparison and Performance Analysis of FACTs Controller in System Stability  [PDF]
Karthikeyan Ramasamy
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.710253
Abstract: In large inter connected power systems, inter-area oscillations are turned to be a severe problem. Hence inter-area oscillations cause severe problems like damage to generators, reduce the power transfer capability of transmission lines, increase wear and tear on network components, increase line losses etc. This paper is to maintain the stability of system by damping inter-area oscillations. Implementation of new equipment consists of high power electronics based technologies such as FACTs and proper controller design has become an essential to provide better damping performance than Power System Stabilizer (PSS). With development of Wide Area Measurement System (WAMS), remote signals have become as feedback signals to design Wide Area Damping Controller (WADC) for FACTs devices. In this work, POD is applied to both SVC and SSSC. Simulation studies are carried out in Power System Analysis Toolbox (PSAT) environment to evaluate the effectiveness of the FACTs controller in a large area power system. Results show that extensive analysis of FACTs controller for improving stability of system.
A Novel Fuzzy—Adaptive Hysteresis Controller Based Three Phase Four Wire-Four Leg Shunt Active Filter for Harmonic and Reactive Power Compensation  [PDF]
P. Rathika, D. Devaraj
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.34053
Abstract: This paper presents a fuzzy logic based three phase four wire four-leg shunt active power filter to suppress harmonic currents. Modified instantaneous p-q theory is adopted for calculating the compensating current. Fuzzy-adaptive hysteresis band technique is applied for the current control to derive the switching signals for the voltage source inverter. A fuzzy logic controller is developed to control the voltage of the DC capacitor. Computer simulations are carried out on a sample power system to demonstrate the suitability of the proposed control strategy, for harmonic reduction under three different conditions namely, ideal, unbalance, unbalance and distorted source voltage conditions. The proposed control strategy is found to be effective to reduce the harmonics and compensate reactive power and neutral current and balance load currents under ideal and non-ideal source voltage conditions.
Fluorescent Chemosensing Properties of New Isoindoline Based-Receptors towards F- and Cu2+ Ions  [PDF]
Soosai Devaraj, Muthusamy Kandaswamy
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.31006
Abstract:

Two simple colorimetric and fluorescent anion chemosensors based on amide moieties, 4-nitro-N-[(1,3-dioxoisoindolin-2yl)benzamide (1), 3,5-dinitro-N-[(1,3-dioxoisoindolin-2yl)benzamide (2) have been synthesized and characterized. Comparing with other anions studied, the UV-visible absorption spectrum in DMSO shows significant response toward F- ion with high selectivity, and meanwhile color change is observed from colorless to pink and violet for 1 and 2 respectively in the presence of tetrabutylammonium fluoride (TBAF) (5 × 10-3 M). Moreover, F--induced color changes remain the same even in the large excess of Cl- , Br- and I-. In addition, the 1H NMR spectrum titration in DMSO-d6 shows deprotonation of the receptors 1 and 2 in the presence of basic F- ion. In particular, addition of F- to the receptors 1 and 2 resulted in an enhancement in fluorescence intensity at 770 nm. Both receptors 1 and 2 exhibit a fluorescent emission enhancement when addition of Zn2+, Ni2+, Co2+, Cu2+ and Mn2+ metal ions. The fluorescent enhancement values for the receptor 1 are 2.29 (Cu2+), 1.85 (Ni2+), 1.37 (Co2+), 1.27 (Mn2+), 1.25 (Zn2+) and for 2, 2.57 (Cu2+), 1.66 (Ni2+), 1.36 (Co2+), 1.15 (Mn2+), 1.09 (Zn2+). The selectivity of Cu2+ is higher for 1 and 2 than other metal ions such as Zn2+, Ni2+, Co2+ and

Compressive Strength and Electron Paramagnetic Resonance Studies on Waste Glass Admixtured Cement  [PDF]
Ramasamy Gopalakrishnan, Dharshnamoorthy Govindarajan
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.13017
Abstract: The present work reports the effect of waste glass (WG) on the properties of Portland cement through Electron Para- magnetic Resonance (EPR) study. Cement pastes containing 0, 10, and 30% replacement of waste glass with cement and in a water to cement ratio of 0.4 have been prepared. The g factors of Fe(III) and Mn(II) impurities at different hydration ages have been calculated. The decreased gFe values and simultaneous increase in gMn values with increase in replacement % of WG are explained due to retardation of cement hydration.
Literature Review on Network Design Problems in Closed Loop and Reverse Supply Chains  [PDF]
Muthusamy Aravendan, Ramasamy Panneerselvam
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.63012
Abstract:

The productivity of an organization is very much affected by non-value adding activity like logistics, which moves the resources from suppliers to factory, raw materials/semi-finished items within the factory and finished goods from factory to customers via a designated distribution channel called as forward logistics. In some cases, parts of the products such as automobiles, computers, cameras, mobile phones, washing machines, refrigerators, garments, footwear and empty glass bottles of beverages, etc. will be brought back to the factories as a product recovery strategy through reverse logistics network which is integrated in a sustainable closed loop supply chain network. So, it is highly essential to optimize the movement of the items in the reverse logistics network. This paper gives a comprehensive review of literature of the design of networks for the reverse logistics as well as for the reverse logistics coupled with forward logistics. The contributions of the researchers are classified into nine categories based on the methods used to design the logistics network.

An Integrated Multi-Echelon Model for a Sustainable Closed Loop Supply Chain Network Design  [PDF]
Muthusamy Aravendan, Ramasamy Panneerselvam
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.66025
Abstract: The integration of entire supply and value chain into a closed loop network is gaining more importance in recent times in order to ensure a business to be economically and environmentally sustainable with the changing trends in business and social environments, growing environmental consciousness in the society and government legislations to protect the environment as well as the business. In this context, this paper considers a multi-echelon closed loop supply chain network design with forward and reverse logistics components. An attempt has been made to develop a mixed integer non-linear programming model for this problem with different costs so that the sum of the total cost is minimized subject to different constraints pertaining to capacities of the entities of the system, demands of first customers and second customers. A generalized model is presented and then its application is illustrated using an example problem by solving the model using LINGO14. This model forms as a tool to compare future meta-heuristics to check the closeness of their solutions with corresponding optimal solutions.
Literature Review of Open Shop Scheduling Problems  [PDF]
Ellur Anand, Ramasamy Panneerselvam
Intelligent Information Management (IIM) , 2015, DOI: 10.4236/iim.2015.71004
Abstract: This paper discusses review of literature of open shop scheduling problems. First, the problem is classified as per different measures of performance, viz., minimization of makespan, minimization of sum of completion times of jobs, minimization of sum of weighted completion times of all jobs, minimization of total tardiness of all jobs, minimization of sum of weighted tardiness of all jobs, minimization of weighted sum of tardy jobs, and miscellaneous measures of the open shop scheduling problem. In each category, the literature is further classified based on approaches used and then the contributions of researchers in the respective categories are presented. Directions for future research are discussed in the end.
Hybrid Genetic Algorithm for Machine-Component Cell Formation  [PDF]
Murugaiyan Pachayappan, Ramasamy Panneerselvam
Intelligent Information Management (IIM) , 2015, DOI: 10.4236/iim.2015.73010
Abstract: This paper considers machine-component cell formation problem of cellular manufacturing system. Since this problem comes under combinatorial category, development of a meta-heuristic is a must. In this paper, a hybrid genetic algorithm is presented. Normally, in genetic algorithm, the initial population is generated by random assignment of genes in each of the chromosomes. In this paper, the initial population is created using ideal seed heuristic. The proposed algorithm is compared with four other algorithms using 28 problems from literature. Through a completed factorial experiment, it is observed that the proposed algorithm outperforms the other algorithms in terms of grouping efficiency as well as grouping efficacy.
A Novel Enzymatic Method for Preparation and Characterization of Collagen Film from Swim Bladder of Fish Rohu (Labeo rohita)  [PDF]
Ramasamy Sripriya, Ramadhar Kumar
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.615151
Abstract: A novel enzymatic method for extraction and preparation of fish collagen from swim bladder revealed the occurrence of α, β and γ bands with approximately 12.1 g/100g collagen corresponding to 89% of collagen and thus confirmed the nativity and purity of the fish collagen. FT-IR studies confirmed the retention of all three amide bands of I, II and III, and triple helixcity. UN-crosslinked and UV-crosslinked fish collagen membrane records a very high temperature of helix denaturation at 197℃ and 215℃, shrinkage temperature at 50℃ ± 3.2℃ and 62℃ ± 2.7℃ and tensile strength at 16.89 ± 2.5 and 120.02 ± 1.0 Kg/cm2 respectively. Fish collagen matrix promoted NIH 3T3 and L6 cellular growth and proliferation. The study indicates that availability of pure fish collagen could replace bovine collagen in tissue engineering applications.
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