Papers by Siva Nagi Reddy
Desalination and Water Treatment, 2014
The present work reports the development of new (sodium alginate-gelatin (SAG))-g-poly (acrylic a... more The present work reports the development of new (sodium alginate-gelatin (SAG))-g-poly (acrylic acid)/polyaniline (SAPAPN) from sodium alginate/gelatin blend by cross-linking with glutaraldehyde, followed by grafting with poly(acrylic acid) and polyaniline by free radical polymerization using ammonium persulfate. The structure, thermal stability, and morphology of SAPAPN adsorbent was characterized by Fourier transform infrared spectroscopy, thermo gravimetric analysis, and scanning electron microscopy, and results were consistent with the expected structures. The influence of various experimental conditions like pH, time, and initial feed concentrations on the uptake of metal ions like Cu 2+ , Ni 2+ by SAPAPN adsorbent was tested. It was seen that the adsorption equilibrium data could be fitted to the Langmuir isotherm. Desorption studies were performed in acid media and EDTA, to examine whether the SAPAPN adsorbent can be recycled for the metal ion removal. The results showed that with SAPAPN adsorbent, the maximum metal ion uptake achieved is 0.8386 mMg À1 for Cu 2+ and 2.2026 mMg À1 for Ni 2+ , respectively. Metal ion sorption studies showed that the adsorbent can be used for the removal of hazardous metal ions from aqueous solutions. The copper and nickel uptake achieved suggests the potential use of the adsorbent to extract divalent toxic metals from industrial aqueous streams.
Development of Guar Gum Based Semi-IPN Hydrogels for Removal of Toxic Metal Ions
In this paper a novel pH sensitive Guar gam - poly ( acrylamide-co-2-Acrylamido-2-methyl-1-propan... more In this paper a novel pH sensitive Guar gam - poly ( acrylamide-co-2-Acrylamido-2-methyl-1-propanesulphonic acid) ( GG-PAAMPS) hydrogels were prepared by simultaneous freeradical copolymerisation reaction of Guar gam ( GG),acrylicacid(AA) ,acryl amido 2- methyl 1-propane sulphonic acid (AMPS),N,N-methylenebis (acrylamide) (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator in aqueous solution and TEMED as accelerator. In this part westudied swelling properties and characterised with Fourier TransformInfra-red Spectroscopy (FT-IR),Differential scanning calorimetry ( DSC)studies.The swelling parameters were calculated by swelling studies tounderstand the diffusion mechanism.The developed GG-PAAMPS hydrogelscould be used for removal of toxic metal ions.
Polysemy in Compositional Distributional Semantics
Large-scale Semantic Parsing without Question-Answer Pairs
In this paper, we evaluate and compare six semantic relatedness measures used for Hindi semantic ... more In this paper, we evaluate and compare six semantic relatedness measures used for Hindi semantic category labeling. Our experiments show that the measure "adapted lesk" performed better than other measures. However, a simple baseline system achieved better accuracy than all the measures.
Cross Language POS Taggers (and other Tools) for Indian Languages: An Experiment with Kannada using Telugu Resources
Abstract Indian languages are known to have a large speaker base, yet some of these languages hav... more Abstract Indian languages are known to have a large speaker base, yet some of these languages have minimal or non-efficient linguistic resources. For example, Kannada is relatively resource-poor compared to Malayalam, Tamil and Telugu, which in-turn are relatively poor compared to Hindi. Many Indian language pairs exhibit high similarities in morphology and syntactic behaviour eg Kannada is highly similar to Telugu. In this paper, we show how to build a cross-language part-of-speech tagger for Kannada exploiting the ...
Exemplar-based word-space model for compositionality detection: shared task system description
Abstract In this paper, we highlight the problems of polysemy in word space models of composition... more Abstract In this paper, we highlight the problems of polysemy in word space models of compositionality detection. Most models represent each word as a single prototype-based vector without addressing polysemy. We propose an exemplar-based model which is designed to handle polysemy. This model is tested for compositionality detection and it is found to outperform existing prototype-based models. We have participated in the shared task (Biemann and Giesbrecht, 2011) and our best performing exemplar-model is ranked ...
Dynamic and static prototype vectors for semantic composition
Abstract Compositional Distributional Semantic methods model the distributional behavior of a com... more Abstract Compositional Distributional Semantic methods model the distributional behavior of a compound word by exploiting the distributional behavior of its constituent words. In this setting, a constituent word is typically represented by a feature vector conflating all the senses of that word. However, not all the senses of a constituent word are relevant when composing the semantics of the compound. In this paper, we present two different methods for selecting the relevant senses of constituent words. The first one is based on Word ...
All Words Unsupervised Semantic Category Labeling for Hindi
To be appeared in …, Sep 1, 2009
In the task of semantic category labeling, given a text, every word in it has to be assigned a se... more In the task of semantic category labeling, given a text, every word in it has to be assigned a semantic category. Our language of interest is Hindi. We use the ontolog-ical categories defined in Hindi Wordnet as semantic category inventories. In this paper we present two un- ...
Proc. LREC, Malta, May 1, 2010
For many languages there are no large, general-language corpora available. Until the web, all but... more For many languages there are no large, general-language corpora available. Until the web, all but the richest institutions could do little but shake their heads in dismay as corpus-building was long, slow and expensive. But with the advent of the Web it can be highly automated and thereby fast and inexpensive. We have developed acorpus factory'where we build large corpora. In this paper we describe the method we use, and how it has worked, and how various problems were solved, for eight languages: Dutch, Hindi, ...
Proceedings of the ACL 2010 Student …, Jul 13, 2010
This work models Word Sense Disambiguation (WSD) problem as a Distributed Constraint Optimization... more This work models Word Sense Disambiguation (WSD) problem as a Distributed Constraint Optimization Problem (DCOP). To model WSD as a DCOP, we view information from various knowledge sources as constraints. DCOP algorithms have the remarkable property to jointly maximize over a wide range of utility functions associated with these constraints. We show how utility functions can be designed for various knowledge sources. For the purpose of evaluation, we modelled all words WSD as a simple DCOP problem. ...
IIITH: Domain specific word sense disambiguation
Proceedings of the 5th International Workshop on Semantic Evaluation, Jul 15, 2010
We describe two systems that participated in SemEval-2010 task 17 (All-words Word Sense Disambigu... more We describe two systems that participated in SemEval-2010 task 17 (All-words Word Sense Disambiguation on a Specific Domain) and were ranked in the third and fourth positions in the formal evaluation. Domain adaptation techniques using the background documents released in the task were used to assign ranking scores to the words and their senses. The test data was disambiguated using the Personalized PageRank algorithm which was applied to a graph constructed from the whole of WordNet in which nodes are ...
Renewable and Sustainable Energy Reviews, 2015
In this communication, detailed review of the solar thermal power plants based on the available s... more In this communication, detailed review of the solar thermal power plants based on the available solar concentrator systems like parabolic trough, parabolic dish, central tower, linear Fresnel reflector system are reported. The aim of the paper is to summarize overall research work being carried out worldwide on the thermodynamic performance evaluation of solar and other thermal power generation systems using different thermodynamic cycles. An attempt has also been made to assess as well as compare the energetic and exergetic performance of such thermal power generation systems. It has been observed that the efficiencies of the solar concentrator aided coal fired thermal power plant, and combined-cycle power plants are higher as compared to a solar alone thermal power plants. Furthermore, there is much scope in the areas of solar aided thermal power generation for further research with the aim of quantifying energy and exergy losses, and exergy destructions in the components of the solar thermal power generation systems.
Oral signs and salivary parameters as indicators of possible osteoporosis and osteopenia in postmenopausal women -A study of 45 subjects
Osteoporosis is a chronic systemic skeletal disease characterized by low bone mass and micro-arch... more Osteoporosis is a chronic systemic skeletal disease characterized by low bone mass and micro-architectural deterioration, resulting in increased bone fragility and susceptibility to fracture. The World Health Organization (WHO) has defined osteoporosis and osteopenia ...
Solar Energy Entrepreneurship: Today’s challenges, Tomorrow’s Opportunities
Renewable energy sources are sustainable and have the potential to meet present and future global... more Renewable energy sources are sustainable and have the potential to meet present and future global energy demands without inflicting any environmental impacts. The use of renewable energy sources through solar energy systems not only saves the precious high grade energy, but also decreases the rate of depletion of fossil fuels. It also improves the nations (world) economy as investment in the solar energy technologies may cost less than efforts to fulfill the increased demand of fuel supply in future including the cost of damaging factors of environment. One of the promising options is proved to be Solar Energy. It has all the potential, not only in providing most of the heating, cooling and electricity demands of the world, but also to solve the global environmental problems. All countries in the world receive some solar energy at zero cost. Lowering the high initial cost of the solar energy systems and popularization/acceptance among consumers is today’s challenges. There are enorm...
Sustainable development with renewable energy resources: a review
Journal of Renewable and Sustainable Energy, 2012
Hafnium and tantalum carbides for high temperature solar receivers J. Renewable Sustainable Energ... more Hafnium and tantalum carbides for high temperature solar receivers J. Renewable Sustainable Energy 3, 063107 Transformation of concentrated sunlight into laser radiation on small parabolic concentrators J. Renewable Sustainable Energy 3, 053102 A photovoltaic system with three solar cells and a band-stop optical filter J. Renewable Sustainable Energy 3, 023113 Parametric analysis of a coupled photovoltaic/thermal concentrating solar collector for electricity generation
Smart Grid and Renewable Energy, 2010
Finally, explaining the procedure of analysis of thermal power plant systems by exegetical approach.
Renewable Energy, 2012
This article deals with comparative energy and exergetic analysis for evaluation of natural gas f... more This article deals with comparative energy and exergetic analysis for evaluation of natural gas fired combined cycle power plant and solar concentrator aided (feed water heating and low pressure steam generation options) natural gas fired combined cycle power plant. Heat Transfer analysis of Linear Fresnel reflecting solar concentrator (LFRSC) is used to predict the effect of focal distance and width of reflector upon the reflecting surface area. Performance analysis of LFRSC with energetic and exergetic methods and the effect, of concentration ratio and inlet temperature of the fluid is carried out to determine, overall heat loss coefficient of the circular evacuated tube absorber at different receiver temperatures. An instantaneous increase in power generation capacity of about 10% is observed by substituting solar thermal energy for feed water heater and low pressure steam generation. It is observed that the utilization of solar energy for feed water heating and low pressure steam generation is more effective based on exergetic analysis rather than energetic analysis. Furthermore, for a solar aided feed water heating and low pressure steam generation, it is found that the land area requirement is 7 ha/MW for large scale solar thermal storage system to run the plant for 24 h.
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Papers by Siva Nagi Reddy