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Search Results: 1 - 10 of 118 matches for " Thangaraj "
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Power Quality Analysis and Enhancement of Grid Connected Solar Energy System  [PDF]
Kokilavani Thangaraj, Selvakumar Gopalasamy
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78170
Abstract: In recent years, renewable energy resources are utilized to meet the growing energy demand. The integration of renewable energy resources with the grid incorporates power electronic converters for conversion of energy. These power electronic converters introduce power quality issues such as a harmonics, voltage regulation etc. Hence, to improve the power quality issues, this work proposes a new control strategy for a grid interconnected solar system. In this proposed work, a maximum power point tracking (MPPT) scheme has been used to obtain maximum power from the solar system and DC/DC converter is implemented to maintain a constant DC voltage. An active filtering method is utilized to improve the power quality of the grid connected solar system. The proposed system is validated through dynamic simulation using MATLAB/Simulink Power system toolbox and results are delivered to validate the effectiveness of the work.
In-Situ Corrosion Monitoring of Scratched Epoxy Coated Carbon Steel in Saturated Ca(OH)2 with or without 3% NaCl by Scanning Electrochemical Microscopy and Electrochemical Impedance Spectroscopy  [PDF]
Thangaraj Balusamy, Toshiyasu Nishimura
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.77049
Abstract: The present work is investigated the in-situ monitoring of local corrosion process of scratched epoxy coated carbon steel in saturated Ca(OH)2 with and without 3% NaCl using SECM and correlated with EIS. The results obtained from EIS analysis showed that the corrosion resistance of scratched epoxy coated carbon steel decreases in Cl- containing solution as the increase in wet/ dry corrosion cycles. This was indicated by decrease in film resistance (Rf) and charge transfer resistance (Rct), while the coated steel maintain the resistance values in saturated Ca(OH)2, most of which recovered after drying. The corrosion process was monitored using SECM by setting the tip potential at -0.70 V vs Ag/AgCl, where the consumption of dissolved oxygen occurred at the surface of test sample. The consumption of dissolved oxygen current (Ioxy-c) values was increased during the immersion in a solution with 3% NaCl. However, in wet/dry corrosion cycles, Ioxy-c was decreased due to the coverage of hydroxides/oxides at scratch area which suppressed the consumption of dissolved O2. It was found that the continuous decrease in corrosion was mainly attributed to continuous formation of corrosion products at anodic spots.
Fascinating fonts; Is the power of typography a marketing myth?
John Thangaraj
PRism Online PR Journal , 2004,
Abstract: This article examines the literature about typography and the connotative power of fonts, concluding that the existing scholarly research is so brief and sketchy as to provide little support for many of the popular myths and widespread arguments about the importance of font to corporate branding. There are passionate proponents of font branding, and there are even legal arguments in support of font connotation. Yet, while many if not most of these arguments may ultimately prove supportable, this article concludes that to date, the empirical research is scant. Much more investigation is needed to ensure that organisations investing in typography are doing so for valid reasons.
Forced Oscillation of Nonlinear Impulsive Hyperbolic Partial Differential Equation with Several Delays  [PDF]
Vadivel Sadhasivam, Jayapal Kavitha, Thangaraj Raja
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.311175
Abstract: In this paper, we study oscillatory properties of solutions for the nonlinear impulsive hyperbolic equations with several delays. We establish sufficient conditions for oscillation of all solutions.
Assessment of biomedical and pharmacological activities of sea anemones Stichodactyla mertensii and Stichodactyla gigantea from Gulf of Mannar Biosphere Reserve, southeast coast of India
Thangaraj, S;Bragadeeswaran, S;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000100007
Abstract: cnidarians comprise an old and diverse animal phylum, and possess a wide variety of biologically active substances. sea anemones contain a diversity of interesting biologically active compounds including some potent toxins. in the present work, the sea anemones stichodactyla mertensii and stichodactyla gigantea, collected from the mandapam coast, are characterized biomedically and pharmacologically. the crude protein was obtained by using methanol and aqueous extracts. the respective protein contents of s. mertensii and s. gigantea were found to be 2.10 μg/ml and 1.87 μg/ml. the methanol and aqueous extracts of s. mertensii and s. gigantea yielded six and nine bands by sds-page on 12% gel. in the hemolytic assay, both extracts exhibited hemolytic effect on chicken, goat, cow and human erythrocytes ('a', 'b' and 'o'). the neurotoxic effects of these crude extracts were determined in vivo using the sea shore crab ocypode macrocera and mortality was observed. the mouse bioassay for lethality was performed on male albino mice. the crude extract of s. mertensii showed higher lethality (58 seconds at 1 ml-dose) than that of s. gigantea (2 minutes and 10 seconds at 0.75 ml-dose). the analgesic activity test was also carried out on albino mice by eddy's hot plate and tail-flick methods. the extracts showed moderate analgesic effect by both hot-plate and tail-flick methods. these characteristics emphasize the need for the isolation and molecular characterization of new active toxins in s. mertensii and s. gigantea.
Genomic view on the peopling of India
Tamang Rakesh,Thangaraj Kumarasamy
Investigative Genetics , 2012, DOI: 10.1186/2041-2223-3-20
Abstract: India is known for its vast human diversity, consisting of more than four and a half thousand anthropologically well-defined populations. Each population differs in terms of language, culture, physical features and, most importantly, genetic architecture. The size of populations varies from a few hundred to millions. Based on the social structure, Indians are classified into various caste, tribe and religious groups. These social classifications are very rigid and have remained undisturbed by emerging urbanisation and cultural changes. The variable social customs, strict endogamy marriage practices, long-term isolation and evolutionary forces have added immensely to the diversification of the Indian populations. These factors have also led to these populations acquiring a set of Indian-specific genetic variations responsible for various diseases in India. Interestingly, most of these variations are absent outside the Indian subcontinent. Thus, this review is focused on the peopling of India, the caste system, marriage practice and the resulting health and forensic implications.
Ontology Based Fuzzy Document Clustering Scheme
Thangamani. M,Thangaraj. P
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n7p148
Abstract: Document clustering is the technique used to group up the document with the reference to the similarity. It is widely used in web mining and digital library environment. Documents are represented in vector space model. Each document is a vector in the word space and each element of the vector indicates the frequency of the corresponding word in the document. Documents are presented as high dimensional data elements. It is a very complex task to cluster documents using K-means clustering algorithm. The sub space clustering schemes can be adopted to cluster documents. The document clustering uses the term weights from the similarity measure. The sub space model uses the relevant attributes for the similarity estimation. The fuzzy logic is used to cluster the documents. The fuzzy document clustering scheme is enhanced with semantic analysis mechanism. Semantic analysis is carried out with the support of the ontology. The ontology is used to maintain term relationships. Term relationships are represented using the synonym, meronym and hypernym factors. Ontology is manually collected by the users. Domain based ontology is used for the document clustering process. The system uses the data mining domain based ontology for the semantic analysis. Semantic weights are used in the similarity measure. Fuzzy based text document clustering scheme uses the stop word filters and stemming process under the document preprocess. Term clustering and semantic clustering operations are performed in the system.
Performance Comparison of IEEE 802.11e EDCA and 802.11b DCF Under Non-Saturation Condition using Network Simulator
G. Prakash,P. Thangaraj
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In this study, throughput and delay performance of IEEE 802.11b and 802.11e is presented under non-saturation conditions. In order to improve the performance of IEEE 802.11b, the IEEE 802.11e has been proposed to improve the Quality of Services (QoS) for multimedia application. The standard 802.11b CSMA/CA contention mechanism does not support QoS but the standard 802.11e provides QoS by adjustment of MAC parameters. The comparison of 802.11b DCF and 802.11e EDCA mechanism by using Network Simulator (NS-2) with different parameters such as throughput, delay, CWmin and AIFS differentiation are simulated. The EDCA stations have more competitive advantages than 802.11b under all the above parameters. The simulation results show that the proposed algorithm improves the performance of the EDCA stations.
Solving fuzzy linear fractional programming problem using metric distance ranking
Al. Nachammai,P. Thangaraj
Applied Mathematical Sciences , 2012,
Abstract:
Antioxidant and antimicrobial potential of methanolic extract of Indian sacred grove Gymnostachyum febrifugum Benth. root
Karuppusamy Arunachalam,Thangaraj Parimelazhagan
International Journal of Pharmaceutical and Biological Research , 2011,
Abstract: The methanolic extract of root from Gymnostachyum febrifugum was analyzed for the quantification of total phenolics, tannins and flavonoids. The antioxidant activity was evaluated using various free radical scavenging assays and antibacterial activity against clinically important bacterial strains. Free radical scavenging assays such as hydroxyl, superoxide anion radicals, 2,2- diphenyl-1-picryl hydrazyl (DPPH) and 2,2’-azinobis-(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS) radical scavenging assays were performed. Itwas observed that the extract effectively scavenged hydroxyl and superoxide anion radicals. It also scavenges DPPH and ABTS radicals. All the concentrations of root extract showed free radical scavenging and antioxidant power and the preventive effects were in a dose-dependent manner. Those various antioxidant activities werecompared to standard antioxidants such as ascorbic acid, butylated hydroxytoluene (BHT) and α-tocopherol. The agar disk diffusion method was used to study the antibacterial activity of G. febrifugum methanol extract of root against five bacterial strains.
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