Time filter

Source Type

Prathap G.,Vidya Academy of Science and Technology | Prathap G.,Kerala University
Scientometrics | Year: 2017

In this paper a three-dimensional framework to see how Indian universities and research-focused institutions fare in the world of high end research in terms of excellence and diversity of its research base is proposed. At the country level scholarly performance is broken down into three components—size, excellence and balance or evenness. A web application available in the public domain which visualizes scientific excellence worldwide in several subject areas is used. India has a presence in fifteen of twenty-two subject areas in which there are at least 50 institutes globally that have published more than 500 papers. It has no institution which can be counted at this level of size and excellence in seven areas: Arts and Humanities; Business, Management and Accounting; Health Professions; Neuroscience; Nursing; Psychology; and Social Sciences. India’s research base is completely skewed towards the Physical Sciences and Engineering with very little for Biological Sciences and Medicine and virtually none in Social Sciences and Arts and Humanities when excellence at the highest level is considered. Its performance is also benchmarked against three nations, namely Australia, The Netherlands and Taiwan which are of similar size in terms of GDP and scientific output. It is seen that although India has the highest GDP among the four countries, its performance lags considerably behind. Even in terms of diversity, its performance is poor compared to the three comparator countries. © 2017 Akadémiai Kiadó, Budapest, Hungary

Das A.,Vidya Academy of Science and Technology
2016 IEEE Annual India Conference, INDICON 2016 | Year: 2016

The concept of transformerless inverters has become a future trend for single phase photovoltaic grid - tied systems. The major factor to be considered while employing transformerless inverters in such applications is the leakage currents. The lack of transformers in inverters, implemented between PV panel and grid results in a galvanic connection and thus there arises problems due to leakage currents. This paper deals with an H6 transformerless full-bridge inverter topology with low leakage currents that can be used in PV grid tied applications. This H6 inverter topology is taken as an example for detail analysis with operation modes and modulation strategy. A closed loop has been developed for maintaining the voltage constant at the grid side irrespective of changes in the input voltage. Aforementioned transformerless topology is simulated for evaluating the performances in terms of power efficiency and leakage currents characteristics and a prototype for the H6 inverter topology is also built. © 2016 IEEE.

Sobha A.P.,Vidya Academy of Science and Technology | Sobha A.P.,Cochin University of Science and Technology | Narayanankutty S.K.,Cochin University of Science and Technology
IEEE Transactions on Nanotechnology | Year: 2014

Nanocomposites consisting of functionalized multiwalled carbon nanotubes and polyaniline (PANI) were prepared by traditional in-situ polymerization and dynamic interfacial polymerization methods. Morphological and structural analysis showed that synthesis by interfacial polymerization resulted in a well-ordered composite with a uniform core-shell structure, while traditional in-situ dynamic polymerization resulted in composites having a thick core shell structure with many protrusions. Composites synthesized by interfacial polymerization showed better electrical conductivity and seebeck coefficient as compared to composites synthesized by traditional in-situ polymerization. The highly extended and well-aligned PANI chain structure increased the effective degree of electron delocalization between pi bonds in aromatic rings of PANI and graphitic structure of nanotubes and, therefore, enhanced the carrier mobility in PANI. However, there was no corresponding increase in the thermal conductivity of the composite, which was due to phonon scattering effect of nanointerfaces. Thus, the introduction of a large number of nanointerfaces, which scatter phonons very effectively, leads to the development of nanostructured composites with enhanced power factor making it suitable for thermoelectric applications. © 2002-2012 IEEE.

Sree Hari P.D.,Indian Institute of Technology Kharagpur | Prabha S.K.,Vidya Academy of Science and Technology | Sathian S.P.,Indian Institute of Technology Madras
Physica A: Statistical Mechanics and its Applications | Year: 2015

Abstract Molecular Dynamics simulations are performed to investigate the influence of system boundaries and characteristic length (L) of the system on the mean free path (MFP) of rarefied gas confined to the walls of a nano-channel. Isothermal Lennard-Jones fluid confined between Reflective walls and platinum walls at different number densities (0.31 atoms/nm3 and 1.61 atoms/nm3) are independently considered. The MFP is calculated by the Lagrangian approach of tracking the trajectory of each atom and averaging the distance between successive collisions. The percentage of fluid-wall collisions is observed to predominate over fluid-fluid collisions at high levels of rarefaction. The influence of L (varying from 6 nm to 16 nm) on MFP is examined in this regime. At lower Knudsen number (Kn), it is observed that the effect of L on MFP is minimal. However, at higher rarefaction the characteristic dimension influences the MFP significantly for various wall configurations. © 2015 Elsevier B.V.

Prabha S.K.,Vidya Academy of Science and Technology | Sathian S.P.,Indian Institute of Technology Madras
International Journal of Thermal Sciences | Year: 2014

Molecular dynamics study of non-reacting and disparate mass binary gas mixture is conducted. To investigate the gas-surface interaction properties of the gas mixture, in non-continuum regime, the rarefied gas confined in a nanochannel is considered. While keeping the bulk number density a constant, the interaction properties of gas mixtures at different molar concentration of individual components are determined. The study discusses the calculation of accommodation coefficients and prediction of the reflected gas distribution using accommodation coefficients. The Maxwell-type model that use calculated values of accommodation coefficients accurately predicts the reflected tangential and normal distributions. The model is validated for different wall-fluid conditions. The velocity correlation of individual gases demonstrates that the individual components of gas mixture are accommodated in different proportion. The result from the study will be beneficial in the analysis and development of potential applications involving the flow of gas mixture in a nanochannel. © 2014 Elsevier Masson SAS. All rights reserved.

Balagopalan S.,Vidya Academy of Science and Technology
IET Conference Publications | Year: 2011

Cooperative game theory is relevant for ensuring reliability of power grid of electricity markets, where central objectives of its transmission sector clash with the private incentive of its players. It is a critical component of market engineering as also is differential pricing, which is used here for pricing of transmission. Another tool used in the model for transmission sector, is a power vector to identify coalition partners. This procedural model is explained in three phases of game theory and is illustrated using a 24 bus power system. The results are significant and show that loss, congestion and total power flow in lines decrease considerably, improving efficiency. © 2012 The Institution of Engineering and Technology.

Balagopalan S.,Vidya Academy of Science and Technology
IET Conference Publications | Year: 2011

Retractions in real time operation of transmission sector of electricity markets is the concern addressed here. This issue is resolved through the design of a socially stable pay-off vector in a Socially Structured Transferable Utility game based on cooperative game theory. Its algorithm requires an ordering of the players, here Discos, in a given social structure and a method of ranking them in a permutation and is devised to be endogenous to power markets. A transmission price is crafted to be used as the coalition value of the game, in order to identify trades with least impact on the grid. The development of power vectors signifying the strength of the players, ranking based on objective of the game and price design are in tune with the needs of an electricity market and a socially stable solution space. The game is applied to a five bus power system and results are analyzed. This work is important in the context of a still embryonic electricity market requiring a reliable, secure and harmonious transmission sector. © 2012 The Institution of Engineering and Technology.

Rajalakshmy K.R.,Vidya Academy of Science and Technology | Remya P.C.,Vidya Academy of Science and Technology
Advances in Intelligent Systems and Computing | Year: 2016

Newspaper plays a significant role in our day to day life. In a news article, readers are attracted towards headline. Headline creation is very important while preparing news. It is a tedious work for journalists. Headline needs maximum text content in short length also it should preserve grammar. The proposed system is an automatic headline generation for news article. There are several methods to generate a headline for news. Here the headline is generated using n-gram model. After pre-processing, extract all possible bi-grams from the news. Frequency of bi-grams in the document is found out and sentence is identified. Select all sentences in which the most frequent bi-gram appears. After that rank the sentences based on the locality of the sentence in the document. Then highly ranked sentence will be selected. Finally using some phrase structural rules, new headlines are generated. © Springer India 2016.

Hema P.H.,Vidya Academy of Science and Technology | Sunitha C.,Vidya Academy of Science and Technology
Advances in Intelligent Systems and Computing | Year: 2016

Spell checker is a software tool which can detect incorrectly spelled words in a text document. Developing spell checker for a morphologically rich language like Malayalam is really tedious task. This paper mainly discusses about the construction of spell checker for Malayalam language. Since in Malayalam, many words can be derived from root word, it will be impossible to include all the words in a lexicon. So a hybrid method of different techniques can improve the performance of a spell checker. The method explained is an n-gram based approach and which will be inexpensive to construct without deep linguistic knowledge. Along with n gram, a Minimum edit distance algorithm is also added to detect the errors due to addition, deletion, or interchange of letters in a word. This will improve the efficiency of the spell checker. This approach will be useful when less linguistic resources are available for Malayalam language. And also the performance analysis is done with an existing method of spell checking in Malayalam language. © Springer India 2016.

In this discussion we show that the significance of the cubic relationship observed in Basu et al. (Scientometrics, 2016. doi: 10.1007/s11192-016-1935-0) can be explained simply—QQCI is a proxy for the normalized form of the exergy term X = (TC2/TP) and so the relationship seen in Nishy et al. (Scientometrics 91(1):245–251, 2012) is just confirmed. The original data is reworked to show explicitly the values of X and h3 and using a correlation test it is shown that there is remarkable agreement between X and h3. © 2016 Akadémiai Kiadó, Budapest, Hungary

Loading Vidya Academy of Science and Technology collaborators
Loading Vidya Academy of Science and Technology collaborators