Reduced graphene oxide/strontium titanate heterostructured nanocomposite as sunlight driven photocatalyst for degradation of organic dye pollutants

A. Rosy,G. Kalpana 한국물리학회 2018 Current Applied Physics Vol.18 No.9

Reduced graphene oxide/Strontium titanate (RGO/SrTiO3) heterostructured nanocomposite was synthesized by coupling Hummer's synthesized graphene oxide (GO) with hydrothermally synthesized SrTiO3 nanoparticles (SrTiO3) through a facile and unique high energy ultrasonication technique using triple solvents. XRD result confirmed the successful formation of pure, single phase and primitive cubic crystal structure RGO/SrTiO3 heterostructured nanocomposite. SEM result confirmed the successful intercalation of SrTiO3 nanoparticles over the two dimensional networks of RGO nanosheets. The synergistic and beneficial interactions between SrTiO3 and RGO resulted in smaller crystallite size (53 nm), reduced band gap (2.87 eV) and larger specific surface area (31m2/g) than that of as prepared pure SrTiO3 nanoparticles. RGO strongly influenced the photocatalytic activity of SrTiO3 and hence RGO/SrTiO3 heterostructured nanocomposite exhibited greater efficiency in degrading Rhodamine B (RhB) and Rose Bengal (RB) organic dye pollutants under natural sunlight irradiation than that of pure SrTiO3 nanoparticles.

Development of Fine Denier Silkworm Hybrid $CSR48{\times}CSR5$ of Bombyx mori L. for Superior Quality Silk

Kalpana G. V.,Kumar N. Suresh,Basavaraja H. K.,Reddy N. Mal,Palit A. K. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.10 No.2

Serious attempt for the improvement of quality parameters in silkworm hybrids came rather very late in India. Realising the need for productive breeds to the field and reorientation in breeding methodology, the silkworm breeders of CSRTI, Mysore were able to develop silkworm breeds with fine denier namely, JPN7, CSR48, B63 and B65 of specific industrial requirement through directional selection. As the success of silkworm breeds mainly depends on their combining ability, the developed breeds were subjected for hybrid evaluation. Out of 42 bivoltine hybrids studied, one hybrid, $CSR48{\times}CSR5$ was identified for its superiority over the existing bivoltine hybrids namely $CSR2{\times}CSR4,\;CSR2{\times}CSR5\;and\;CSR18{\times}CSR19$ for majority of qualitative traits. Post cocoon testing of large quantity of cocoons of $CSR48{\times}CSR5$ resulted in the production of high quality '3A'grade silk. It is for the first time in the Indian Sericulture industry that high quality silk with longer filament length of 1474 m, denier of 2.47, standard size deviation of 0.983 d, maximum size deviation of 1.322, neatness of 96 p, reelability of $85\%$, tenacity of 3.87 g/d, elongation of $22.32\%$ and cohesion of 110 strokes was produced. The superiority of fine denier silkworm breeds and their hybrids are discussed.

SOFTWARE PROCESS IMPROVIZATION FRAMEWORK BASED ON FUZZY LOGIC APPROACH FOR OPTIMIZING INDIAN SMALL SCALE SOFTWARE ORGANIZATIONS

A.M.Kalpana,A.Ebenezer Jeyakumar 보안공학연구지원센터 2011 International Journal of Multimedia and Ubiquitous Vol.6 No.1

The microbial activity in development of hydrocarbon microseepage: an indicator for oil and gas exploration

Mohammed A. Rasheed,M. Lakshmi,M.S. Kalpana,A.M. Dayal,D.J. Patil 한국지질과학협의회 2013 Geosciences Journal Vol.17 No.3

Geomicrobial prospecting for hydrocarbons is an exploration method based on the seepage of lighter hydrocarbons from oil/gas reservoirs to the surface and their utilization by hydrocarbon oxidizing bacteria. These bacteria utilize the hydrocarbons as their sole source of food and are found to be enriched in the near surface soils/sediments above the oil and gas reservoirs. The detection of anomalous populations of hydrocarbon utilizing bacteria in the surface soils can help to evaluate the prospects for hydrocarbon exploration. Geomicrobial prospecting studies have been carried out to test the efficacy of surface geochemical methods as regional evaluation tools in the petroliferous region of Mehsana Block, North Cambay Basin, Gujarat and to investigate whether the geomicrobial anomalies can establish an upward migration of hydrocarbons from the deep subsurface. In the present study, bacterial counts for n-pentane utilizing bacteria range between 1.0×102 and 9.80×105 cfu/g and and n-hexane utilizing bacteria range between 1.0×102 and 9.20×105 cfu/g. The bacterial concentration distribution maps show four distinct anomalies in the study area. The possibility of discovering oil or gas reservoirs using the microbiological method is emphasized by the fact that the hydrocarbon oxidizing bacteria range between 103 and 106 cfu/g in soil/sediment receiving hydrocarbon microseepages. In the present study area of the Mehsana Block of Cambay Basin, n-pentane and n-hexane utilizing bacteria show 105 cfu/g of soil sample, which is significant and thereby substantiates the seepage of lighter hydrocarbons from oil and gas reservoirs. Geomicrobial prospecting method has shown good correlation with existing oil/ gas fields of Mehsana, Gujarat.

Geo-microbial and geochemical evidences in the near surface soils of Jamnagar sub-basin, Saurashtra, Gujarat, India: implications to hydrocarbon resource potential

Mohammed A. Rasheed,M. Lakshmi,M.S. Kalpana,P.L.S. Rao,D.J. Patil,V. Sudarshan,A.M. Dayal 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.4

The Jamnagar sub-basin of Saurashtra, Gujarat is considered geologically prospective for hydrocarbons by Directorate General of Hydrocarbons (DGH), India. However the major part of the Jamnagar sub-basin is covered by Deccan Traps, hindering the exploration of Mesozoic hydrocarbon targets. In India, significant hydrocarbon finding in the stratigraphic sequence has not been established, as the major part of the Mesozoic sediments is underlying the Deccan Traps. Detection and mapping of the Mesozoic sediments below the Deccan Trap has been a long-standing complex geophysical problem facing the oil industry. The vast sheet of volcanic cover, which overlies the Mesozoic sediments acts as a geophysical shield and inhibit the effective use of conventional seismic techniques. Surface geochemical techniques based on hydrocarbon microseepage from subsurface accumulations, have potential to evaluate the prospects for petroleum exploration. In view of this, surface geochemical survey for adsorbed soil gas and microbial analysis was conducted in Jamnagar sub-basin, total 150 near surface soil samples were collected for the evaluation of hydrocarbon resource potential of the Basin. Microbial analysis revealed high bacteria counts for methane (1.32×106 cfu/gm), ethane (8.50× 105 cfu/gm), propane (6.86×105 cfu/gm) and butane oxidizing bacteria (5.70×105 cfu/gm) in soil samples of Jamnagar sub-basin. The bacterial concentration distribution maps show three distinct anomalies in the study area, indicating hydrocarbon microseepage at these places. The geochemical investigations in soil samples showed the presence of high adsorbed hydrocarbon gases concentration of methane (C1) 1 to 518 ppb and Ethane plus hydrocarbons (C2+) 1 to 977 ppb respectively. Further, carrying out integrated geo-microbial and geo-chemical studies with adsorbed soil gas showed the anomalous hydrocarbon zones nearby Khandera, Haripur, and Laloi areas which could probably aid to assess the true potential of the Basin. On the basis of microbial prospecting and adsorbed soil gas studies Jamnagar sub-basin study area appears to be a warm zone for hydrocarbon prospects and needs detailed investigation with other geo-scientific methods. Integrated geophysical studies have shown that Jamnagar sub-basin of Saurashtra has significant sediment thickness below the Deccan Traps and can be considered for future hydrocarbon exploration. The corroboration of adsorbed light gaseous hydrocarbons and hydrocarbon oxidizing bacteria suggests its efficacy as one of the potential tool in surface geochemical exploration of hydrocarbons.

Development of Fine Denier Silkworm Hybrid CSR48×CSR5 of Bombyx mori L. for Superior Quality Silk

( G. V. Kalpana ),( N. Suresh Kumar ),( H. K. Basavaraja ),( N. Mal Reddy ),( A. K. Palit ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.10 No.2

Serious attempt for the improvement of quality parameters in silkworm hybrids came rather very late in India. Realising the need for productive breeds to the field and reorientation in breeding methodology, the silkworm breeders of CSRTI, Mysore were able to develop silkworm breeds with fine denier namely, JPN7, CSR48, B63 and B65 of specific industrial requirement through directional selection. As the success of silkworm breeds mainly depends on their combining ability, the developed breeds were subjected for hybrid evaluation. Out of 42 bivoltine hybrids studied, one hybrid, CSR48×CSR5 was identified for its superiority over the existing bivoltine hybrids namely CSR2×CSR4, CSR2×CSR5 and CSR18×CSR19 for majority of qualitative traits. Post cocoon testing of large quantity of cocoons of CSR48×CSR5 resulted in the production of high quality 3A grade silk. It is for the first time in the Indian Sericulture industry that high quality silk with longer filament length of 1474m, denier of 2.47, standard size deviation of 0.983d, maximum size deviation of 1.322, neatness of 96p, reelability of, 85% tenacity of 3.87 g/d, elongation of 22.32% and cohesion of 110 strokes was produced. The superiority of fine denier silkworm breeds and their hybrids are discussed.

Biomediated Silver Nanoparticles for the Highly Selective Copper(II) Ion Sensor Applications

Kirubaharan, C. Joseph,Kalpana, D.,Lee, Yang Soo,Kim, A. R.,Yoo, Don Jin,Nahm, Kee Suk,Kumar, G. Gnana American Chemical Society 2012 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.51 No.21

<P>Nanoparticles synthesis is an evergreen research field of 21st century in which the connotation of the biomediated experimental process is highly imperative. Biomediated silver nanoparticles were synthesized with the aid of an eco-friendly biomaterial, namely, aqueous <I>Azadirachta indica</I> extract. The effect of pH and temperature on the formation of silver nanoparticles was analyzed. Formation of the silver nanoparticles was verified by surface plasmon spectra using a UV–vis spectrophotometer. Morphology and crystalline structure of the prepared silver nanoparticles were characterized by TEM and XRD techniques, respectively. Furthermore, the biomediated silver nanoparticles without any surface modification were used for the heavy metal ion sensors in aqueous media. The prepared silver nanoparticles were successful in detecting even the minimal amount of heavy metal copper(II) ion and exhibited excellent specific metal ion selectivity.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie3003232'>ACS Electronic Supporting Info</A></P>

Influence of vermiculite and sintered fly ash in robustness and hardened properties of light weight self-compacting concrete

A. Anitha,V.G. Kalpana,P. Muthupriya 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1

The performance of Light Weight Self-Compacting Concrete (LWSCC) incorporated with Sintered Fly Ash and Vermiculiteare investigated in this study. The robustness and hardened properties of the LWSCC is investigated at diverse proportioningrates where Cement, Fine Aggregate and Coarse Aggregate are replaced with Fly Ash (FA) (25%), Vermiculite (1-9%) andSintered Fly Ash (SFA) (10-50%) respectively. The workability properties such as Filling ability, Passing ability, viscosity andthe mechanical properties such as density, compressive strength, tensile strength, flexural strength, ultrasonic pulse velocity,acid and sulphate resistance were studied. The percentage loss in weight and loss in compressive strength due to Acid attackand Sulphate attack at the age of 28 days of LWSCC were observed by immersing in 10% of HNO3, magnesium sulphate andsodium sulphate solutions. Vermiculite with SFA considerably boosted the workability and mechanical properties of LWSCCmixes. The presence of lightweight aggregates reduced the strength loss caused by sodium and magnesium sulphate ions. Acombination of 5% of Vermiculite and 30% of SFA resulted with the best robustness and hardened property of concrete

ASYMPTPTIC DISTRIBUTION OF LIKELINOOD RATIO STATISTIC FOR TESTING MULTISAMPLE SPHERICITY

Gupta, A.K.,Nagar, D.K.,Jain, Kalpana The Korean Statistical Society 1992 Journal of the Korean Statistical Society Vol.21 No.1

In this paper, asymptotic expansions of the distribution of the likelihood ratio statistic for testing multisample sphericity have been derived in the null and nonnull cases when the alternatives are close to the null hypothesis. These expansions are obtained in the form of series of data distributions.

Evaluation of Protective Ability of High Solid Novolac Clear Coatings Through Electrochemical Techniques

( D. Ramesh ),( P. Shakkthivel ),( A. Susai Manickam ),( A. Kalpana ),( T. Vasudevan ) 한국부식방식학회(구 한국부식학회) 2006 Corrosion Science and Technology Vol.5 No.2