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34 results on '"Bhatt, V. K."'

8. Supernova 2012aw - a high-energy clone of archetypal type IIP SN 1999em

Author

Bose, Subhash, Kumar, Brijesh, Sutaria, Firoza, Kumar, Brajesh, Roy, Rupak, Bhatt, V. K., Pandey, S. B., Chandola, H. C., Sagar, Ram, Misra, Kuntal, and Chakraborti, Sayan

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present densely-sampled UBVRI/griz photometric and low-resolution (6-10A) optical spectroscopic observations from 4 to 270 days after explosion of a newly discovered type II SN 2012aw in a nearby (~9.9 Mpc) galaxy M95. The light-curve characteristics of apparent magnitudes, colors, bolometric luminosity and the presence and evolution of prominent spectral features are found to have striking similarity with the archetypal IIP SNe 1999em, 1999gi and 2004et. The early time observations of SN 2012aw clearly detect minima in the light-curve of V, R and I bands near 37 days after explosion and this we suggest to be an observational evidence for emergence of recombination phase. The mid-plateau MV magnitude (-16.67 $\pm$ 0.04) lies in between the bright (~ -18) and subluminous (~ -15) IIP SNe. The mass of nickel is 0.06$\pm$0.01 M_sun. The SYNOW modelling of spectra indicate that the value and evolution of photospheric velocity is similar to SN 2004et, but about ~600 km/s higher than that of SNe 1999em and 1999gi at comparable epochs. This trend is more apparent in the line velocities of H alpha and H beta. A comparison of ejecta velocity properties with that of existing radiation-hydrodynamical simulations indicate that the energy of explosion lies in the range 1-2x10^51 ergs; a further comparison of nebular phase [Oi] doublet luminosity with SNe 2004et and 1987A indicate that the mass of progenitor star is about 14-15 M_sun. The presence of high-velocity absorption features in the mid-to-late plateau and possibly in early phase spectra show signs of interaction between ejecta and the circumstellar matter; being consistent with its early-time detection at X-ray and radio wavebands., Comment: 22 pages, 18 figures, 7 tables, Accepted to MNRAS

Published
2013
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9. Light curve and spectral evolution of the Type IIb SN 2011fu

Author

Kumar, Brajesh, Pandey, S. B., Sahu, D. K., Vinko, J., Moskvitin, A. S., Anupama, G. C., Bhatt, V. K., Ordasi, A., Nagy, A., Sokolov, V. V., Sokolova, T. N., Komarova, V. N., Kumar, Brijesh, Bose, Subhash, Roy, Rupak, and Sagar, Ram

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present the low-resolution spectroscopic and UBVRI broad-band photometric investigations of the Type IIb supernova 2011fu, discovered in UGC 01626. The photometric follow-up of this event has been initiated a few days after the explosion and covers a period of about 175 days. The early-phase light curve shows a rise followed by steep decay in all bands and shares properties very similar to that seen in case of SN 1993J, with a possible detection of the adiabatic cooling phase. Modelling of the quasi-bolometric light curve suggests that the progenitor had an extended ($\sim 1 \times 10^{13}$ cm), low-mass ($\sim 0.1$ $M_\odot$) H-rich envelope on top of a dense, compact ($\sim 2 \times 10^{11}$ cm), more massive ($\sim$ 1.1 $M_\odot$) He-rich core. The nickel mass synthesized during the explosion was found to be $\sim$ 0.21 $M_\odot$, slightly larger than seen in case of other Type IIb SNe. The spectral modelling performed with SYNOW suggests that the early-phase line velocities for H and Fe\,{\sc ii} features were $\sim 16000$ km s$^{-1}$ and $\sim 14000$ km s$^{-1}$, respectively. Then the velocities declined up to day +40 and became nearly constant at later epochs., Comment: 16 pages, 9 figures, 7 tables, accepted to MNRAS

Published
2013
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11. Intranight optical variability of \gamma-ray loud Narrow Line Seyfert 1 galaxies

Author

Paliya, Vaidehi S., Stalin, C. S., Kumar, Brijesh, Kumar, Brajesh, Bhatt, V. K., Pandey, S. B., and Yadav, R. K. S.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Large Area Telescope (LAT) onboard the {\it Fermi} Gamma Ray Space Telescope has detected \gamma-ray emission from some Narrow Line Seyfert 1(NLSy1) galaxies. This indicates the presence of relativistic jets in these sources similar to blazars and radio galaxies. In an attempt to have an idea of the intranight optical variability (INOV) characteristics of these \gamma-ray loud NLSy1 galaxies, we have carried out optical flux monitoring observations of three NLSy1 galaxies detected by {\it Fermi}/LAT: 1H 0323+342, PMN J0948+0022 and PKS 1502+036. These optical monitoring observations showed the presence of rapid optical flux variations in these sources. The intranight differential light curves of these sources have revealed flux variations on time scales of hours with amplitudes of variability > 3 percent for most of the time. On using the {\it F}-statistics to classify the variability nature of these sources, we obtained a duty cycle (DC) of INOV of ~85 percent. Alternatively, the more commonly used {\it C}-statistics gave a DC of INOV of ~57 percent. Such high DC of INOV are characteristics of the BL Lac class of AGN. The results of our monitoring observations thus indicate that there is similarity in the INOV nature of \gamma-ray loud NLSy1 galaxies and BL Lac objects, arguing strongly for the presence of relativistic jets aligned closely to the observers line of sight. Moreover, our dense monitoring observations on some of the nights have led to the clear detection of some mini-flares superimposed on the flux variations during the night over timescales as short as 12 minutes. The detection of short timescale flux variability in the sources studied here is clearly due to stronger time compression leading to the jets in these sources having large Doppler factors, similar to that of the inner jets of TeV blazars., Comment: 10 pages, 5 figures, to be appeared in MNRAS

Published
2012
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12. Sustainable Water Harvesting for Improving Food Security and Livelihoods of Smallholders under Different Climatic Conditions of India

Author

Panwar, Pankaj, primary, Machiwal, Deepesh, additional, Kumari, Vandita, additional, Kumar, Sanjay, additional, Dogra, Pradeep, additional, Manivannan, S., additional, Bhatnagar, P. R., additional, Tomar, J. M. S., additional, Kaushal, Rajesh, additional, Jinger, Dinesh, additional, Sarkar, Pradip Kumar, additional, Baishya, L. K., additional, Devi, Ningthoujam Peetambari, additional, Kakade, Vijaysinha, additional, Singh, Gaurav, additional, Singh, Nongmaithem Raju, additional, Singh, S. Gojendro, additional, Patel, Abhishek, additional, Renjith, P. S., additional, Pal, Sharmistha, additional, Bhatt, V. K., additional, Sharma, N. K., additional, Khola, O. P. S., additional, Radhakrishnan, Sheetal K., additional, Kasthuri Thilagam, V., additional, Bhutia, P. L., additional, Nath, Kouberi, additional, Das, Rekha, additional, Daschaudhuri, Dhiman, additional, Kumar, Arun, additional, Panwar, G. S., additional, Dwivedi, S. V., additional, Kumar, Sanjeev, additional, and Singh, B. K., additional

Published
2023
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15. Fungal planet description sheets: 1042-1111

Author

Crous, P. W., Wingfield, M. J., Chooi, Y. H., Gilchrist, C. L. M., Lacey, E., Pitt, J. I., Roets, F., Swart, W. J., Cano-Lira, J. F., Valenzuela-Lopez, N., Hubka, V., Shivas, R. G., Stchigel, A. M., Holdom, D. G., Jurjević, Željko, Kachalkin, A. V., Lebel, T., Lock, C., Martín, María P., Tan, Y. P., Tomashevskaya, M. A., Vitelli, J. S., Baseia, I. G., Bhatt, V. K., Brandrud, T. E., de Souza, J. T., Dima, B., Lacey, H. J., Lombard, L., Johnston, P. R., Morte, A., Papp, V., Rodríguez, A., Rodríguez-Andrade, E., Semwal, K. C., Tegart, L., Abad, Z. G., Akulov, A., Alvarado, P., Alves, A., Andrade, J. P., Arenas, F., Asenjo, C., Ballarà, J., Barrett, Matthew D., Berná, L. M., Berraf-Tebbal, A., Virginia Bianchinotti, M., Bransgrove, K., Esteve-Raventós, F., Garrido-Benavent, Isaac, González, M., Guarnizo, A. L., Guarro, J., Magaña-Dueñas, V., Mahiques, R., Muñoz-Mohedano, J. M., Navarro-Ródenas, A., Paños, A., Paz-Conde, A., Pintos, Á., Rubio, E., Crous, P. W., Wingfield, M. J., Chooi, Y. H., Gilchrist, C. L. M., Lacey, E., Pitt, J. I., Roets, F., Swart, W. J., Cano-Lira, J. F., Valenzuela-Lopez, N., Hubka, V., Shivas, R. G., Stchigel, A. M., Holdom, D. G., Jurjević, Željko, Kachalkin, A. V., Lebel, T., Lock, C., Martín, María P., Tan, Y. P., Tomashevskaya, M. A., Vitelli, J. S., Baseia, I. G., Bhatt, V. K., Brandrud, T. E., de Souza, J. T., Dima, B., Lacey, H. J., Lombard, L., Johnston, P. R., Morte, A., Papp, V., Rodríguez, A., Rodríguez-Andrade, E., Semwal, K. C., Tegart, L., Abad, Z. G., Akulov, A., Alvarado, P., Alves, A., Andrade, J. P., Arenas, F., Asenjo, C., Ballarà, J., Barrett, Matthew D., Berná, L. M., Berraf-Tebbal, A., Virginia Bianchinotti, M., Bransgrove, K., Esteve-Raventós, F., Garrido-Benavent, Isaac, González, M., Guarnizo, A. L., Guarro, J., Magaña-Dueñas, V., Mahiques, R., Muñoz-Mohedano, J. M., Navarro-Ródenas, A., Paños, A., Paz-Conde, A., Pintos, Á., and Rubio, E.

Abstract

Novel species of fungi described in this study include those from various countries as follows: Antarctica, Cladosporium arenosum from marine sediment sand. Argentina, Kosmimatamyces alatophylus (incl. Kosmimatamyces gen. nov.) from soil. Australia, Aspergillus banksianus, Aspergillus kumbius, Aspergillus luteorubrus, Aspergillus malvicolor and Aspergillus nanangensis from soil, Erysiphe medicaginis from leaves of Medicago polymorpha, Hymenotorrendiella communis on leaf litter of Eucalyptus bicostata, Lactifluus albopicri and Lactifluus austropiperatus on soil, Macalpinomyces collinsiae on Eriachne benthamii, Marasmius vagus on soil, Microdochium dawsoniorum from leaves of Sporobolus natalensis, Neopestalotiopsis nebuloides from leaves of Sporobolus elongatus, Pestalotiopsis etonensis from leaves of Sporobolus jacquemontii, Phytophthora personensis from soil associated with dying Grevillea mccutcheonii. Brazil, Aspergillus oxumiae from soil, Calvatia baixaverdensis on soil, Geastrum calycicoriaceum on leaf litter, Greeneria kielmeyerae on leaf spots of Kielmeyera coriacea. Chile, Phytophthora aysenensis on collar rot and stem of Aristotelia chilensis. Croatia, Mollisia gibbospora on fallen branch of Fagus sylvatica. Czech Republic, Neosetophoma hnaniceana from Buxus sempervirens. Ecuador, Exophiala frigidotolerans from soil. Estonia, Elaphomyces bucholtzii in soil. France, Venturia paralias from leaves of Euphorbia paralias. India, Cortinarius balteatoindicus and Cortinarius ulkhagarhiensis on leaf litter. Indonesia, Hymenotorrendiella indonesiana on Eucalyptus urophylla leaf litter. Italy, Penicillium taurinense from indoor chestnut mill. Malaysia, Hemileucoglossum kelabitense on soil, Satchmopsis pini on dead needles of Pinus tecunumanii. Poland, Lecanicillium praecognitum on insects’ frass. Portugal, Neodevriesia aestuarina from saline water. Republic of Korea, Gongronella namwonensis from freshwater. Russia, Candida pellucida from Exomias pellucidus, Heterocepha

Published
2020

16. Fungal Planet description sheets: 1042-1111

Author

Universitat Rovira i Virgili, Crous, P. W.; Wingfield, M. J.; Chooi, Y. -H.; Gilchrist, C. L. M.; Lacey, E.; Pitt, J. I.; Roets, F.; Swart, W. J.; Cano-Lira, J. F.; Valenzuela-Lopez, N.; Hubka, V.; Shivas, R. G.; Stchigel, A. M.; Holdom, D. G.; Jurjevic, Z.; Kachalkin, A. V.; Lebel, T.; Lock, C.; Martin, M. P.; Tan, Y. P.; Tomashevskaya, M. A.; Vitelli, J. S.; Baseia, I. G.; Bhatt, V. K.; Brandrud, T. E.; De Souza, J. T.; Dima, B.; Lacey, H. J.; Lombard, L.; Johnston, P. R.; Morte, A.; Papp, V.; Rodriguez, A.; Rodriguez-Andrade, E.; Semwal, K. C.; Tegart, L.; Abad, Z. G.; Akulov, A.; Alvarado, P.; Alves, A.; Andrade, J. P.; Arenas, F.; Asenjo, C.; Ballara, J.; Barrett, M. D.; Berna, L. M.; Berraf-Tebbal, A.; Bianchinotti, M. V.; Bransgrove, K.; Burgess, T. I.; Carmo, F. S.; Chavez, R.; Cmokova, A.; Dearnaley, J. D. W.; Santiago, A. L. C. M. de A.; Freitas-Neto, J. F.; Denman, S.; Douglas, B.; Dovana, F.; Eichmeier, A.; Esteve-Raventos, F.; Farid, A.; Fedosova, A. G.; Ferisin, G.; Ferreira, R. J.; Ferrer, A.; Figueiredo, C. N.; Figueiredo, Y. F.; Reinoso-Fuentealba, C. G.; Garrido-Benavent, I.; Canete-Gibas, C. F.; Gil-Duran, C.; Glushakova, A. M.; Goncalves, M. F. M.; Gonzalez, M.; Gorczak, M.; Gorton, C.; Guard, F. E.; Guarnizo, A. L.; Guarro, J.; Gutierrez, M.; Hamal, P.; Hien, L. T.; Hocking, A. D.; Houbraken, J.; Hunter, G. C.; Inacio, C. A.; Jourdan, M.; Kapitonov, V. I.; Kelly, L.; Khanh, T. N.; Kislo, K.; Kiss, L.; Kiyashko, A.; Kolarik, M.; Kruse, J.; Kubatova, A.; Kucera, V.; Kucerova, I.; Kusan, I.; Lee, H. B.; Levican, G.; Lewis, A.; Liem, N. V.; Liimatainen, K.; Lim, H. J.; Lyons, M. N.; Macia-Vicente, J. G.; Magana-Duenas, V.; Mahiques, R.; Malysheva, E. F.; Marbach, P. A. S.; Marinho, P.; Matocec, N.; McTaggart, A. R.; Mesic, A.; Morin, L.; Munoz-Mohedano, J. M.; Navarro-Rodenas, A.; N, Universitat Rovira i Virgili, and Crous, P. W.; Wingfield, M. J.; Chooi, Y. -H.; Gilchrist, C. L. M.; Lacey, E.; Pitt, J. I.; Roets, F.; Swart, W. J.; Cano-Lira, J. F.; Valenzuela-Lopez, N.; Hubka, V.; Shivas, R. G.; Stchigel, A. M.; Holdom, D. G.; Jurjevic, Z.; Kachalkin, A. V.; Lebel, T.; Lock, C.; Martin, M. P.; Tan, Y. P.; Tomashevskaya, M. A.; Vitelli, J. S.; Baseia, I. G.; Bhatt, V. K.; Brandrud, T. E.; De Souza, J. T.; Dima, B.; Lacey, H. J.; Lombard, L.; Johnston, P. R.; Morte, A.; Papp, V.; Rodriguez, A.; Rodriguez-Andrade, E.; Semwal, K. C.; Tegart, L.; Abad, Z. G.; Akulov, A.; Alvarado, P.; Alves, A.; Andrade, J. P.; Arenas, F.; Asenjo, C.; Ballara, J.; Barrett, M. D.; Berna, L. M.; Berraf-Tebbal, A.; Bianchinotti, M. V.; Bransgrove, K.; Burgess, T. I.; Carmo, F. S.; Chavez, R.; Cmokova, A.; Dearnaley, J. D. W.; Santiago, A. L. C. M. de A.; Freitas-Neto, J. F.; Denman, S.; Douglas, B.; Dovana, F.; Eichmeier, A.; Esteve-Raventos, F.; Farid, A.; Fedosova, A. G.; Ferisin, G.; Ferreira, R. J.; Ferrer, A.; Figueiredo, C. N.; Figueiredo, Y. F.; Reinoso-Fuentealba, C. G.; Garrido-Benavent, I.; Canete-Gibas, C. F.; Gil-Duran, C.; Glushakova, A. M.; Goncalves, M. F. M.; Gonzalez, M.; Gorczak, M.; Gorton, C.; Guard, F. E.; Guarnizo, A. L.; Guarro, J.; Gutierrez, M.; Hamal, P.; Hien, L. T.; Hocking, A. D.; Houbraken, J.; Hunter, G. C.; Inacio, C. A.; Jourdan, M.; Kapitonov, V. I.; Kelly, L.; Khanh, T. N.; Kislo, K.; Kiss, L.; Kiyashko, A.; Kolarik, M.; Kruse, J.; Kubatova, A.; Kucera, V.; Kucerova, I.; Kusan, I.; Lee, H. B.; Levican, G.; Lewis, A.; Liem, N. V.; Liimatainen, K.; Lim, H. J.; Lyons, M. N.; Macia-Vicente, J. G.; Magana-Duenas, V.; Mahiques, R.; Malysheva, E. F.; Marbach, P. A. S.; Marinho, P.; Matocec, N.; McTaggart, A. R.; Mesic, A.; Morin, L.; Munoz-Mohedano, J. M.; Navarro-Rodenas, A.; N

Abstract

Novel species of fungi described in this study include those from various countries as follows: Antarctica, Cladosporium arenosum from marine sediment sand. Argentina, Kosmimatamyces alatophylus (incl. Kosmimatamyces gen. nov.) from soil. Australia, Aspergillus banksianus, Aspergillus kumbius, Aspergillus luteorubrus, Aspergillus malvicolor and Aspergillus nanangensis from soil, Erysiphe medicaginis from leaves of Medicago polymorpha, Hymenotorrendiella communis on leaf litter of Eucalyptus bicostata, Lactifluus albopicri and Lactifluus austropiperatus on soil, Macalpinomyces collinsiae on Eriachne benthamii, Marasmius vagus on soil, Microdochium dawsoniorum from leaves of Sporobolus natalensis, Neopestalotiopsis nebuloides from leaves of Sporobolus elongatus, Pestalotiopsis etonensis from leaves of Sporobolus jacquemontii, Phytophthora personensis from soil associated with dying Grevillea mccutcheonii. Brazil, Aspergillus oxumiae from soil, Calvatia baixaverdensis on soil, Geastrum calycicoriaceum on leaf litter, Greeneria kielmeyerae on leaf spots of Kielmeyera coriacea. Chile, Phytophthora aysenensis on collar rot and stem of Aristotelia chilensis. Croatia, Mollisia gibbospora on fallen branch of Fagus sylvatica. Czech Republic, Neosetophoma hnaniceana from Buxus sempervirens. Ecuador, Exophiala frigidotolerans from soil. Estonia, Elaphomyces bucholtzii in soil. France, Venturia paralias from leaves of Euphorbia paralias. India, Cortinarius balteatoindicus and Cortinarius ulkhagarhiensis on leaf litter. Indonesia, Hymenotorrendiella indonesiana on Eucalyptus urophylla leaf litter. Italy, Penicillium taurinense from indoor chestnut mill. Malaysia, Hemileucoglossum kelabitense on soil, Satchmopsis pini on dead needles of Pinus tecunumanii. Poland, Lecanicillium praecog

Published
2020

18. Spatio-temporal variability of climatic parameters across different altitudes of North- Western Himalaya.

Author

PANWAR, PANKAJ, PAL, SHARMISTHA, LORIA, NANCY, VERMA, MED RAM, ALAM, N. M., BHATT, V. K., and SHARMA, N. K.

Subjects
ALTITUDES, RAINFALL frequencies, HYDROPONICS, WATER supply, FARM management
Abstract

Climate change impact varies across different altitudinal ranges and demands local specific management strategies for water resource and farming system management. The present study analyses spacio-temporal climate parameters across different altitudes of Himachal Pradesh a hilly state of India. Analysis shows that annually, minimum temperature has significantly decreased by -0.09°C at altitude I (350 - 400 m) while maximum temperature has significantly increased by 0.05°C at altitudes I and II (1400- 1500 m) and decreased significantly by -0.08°C at altitude III (2000- 2100 m). Higher regions Altitude -- IV (2900-3000 m) received lowest rainfall (746.1 mm) with 30.2 % variation. Seasonal rainfall variability was higher in post monsoon (102 - 174%) and least in monsoon (21 - 57%). Annual rainfall at altitude I is strongly irregular (PCI 20.1 to 22.3), followed by altitude -- IV (PCI 15-25); altitude -- II irregular (PCI 15-20) and altitude -- III moderate to irregular (PCI 12 -19) rainfall. Seasonal Index values for four altitudes fall between 0.91-0.96 revealed that rainfall is irregular and markedly seasonal with longer drier season. Higher wavelet powers in altitude - I and II after 2005 suggests frequency of extreme rainfall occurrence had increased. [ABSTRACT FROM AUTHOR]

Published
2019

19. Thermal Analysis of Flow in the Deformation Phase of Liquid Lubricated Plane Strain Forging

Author

Bhatt, V. K.

Subjects
Thermal analysis -- Models, Surfaces, Deformation of -- Research, Lubrication and lubricants -- Testing, Science and technology
Abstract

The generalized energy equation is reduced into a simple form for conduction and convection modes of heat transfer across a hydrodynamic incompressible fluid ,film in the deformation phase of plane-strain forging. Expressions for the temperature, velocity, and flow distributions are obtained by solving the energy equation with appropriate boundary conditions. Application of this analysis is illustrated for the film formation process in the deformation phase of liquid lubricated plane strain forging. The analysis indicates that the Peclet number plays an important role in deciding the variation of lubricant film thickness with position and time in the deformation phase. [S0742-4787(00)02504-2]

Published
2000

21. Intranight optical variability of ��-ray loud Narrow Line Seyfert 1 galaxies

Author

Paliya, Vaidehi S., Stalin, C. S., Kumar, Brijesh, Kumar, Brajesh, Bhatt, V. K., Pandey, S. B., and Yadav, R. K. S.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics
Abstract

The Large Area Telescope (LAT) onboard the {\it Fermi} Gamma Ray Space Telescope has detected ��-ray emission from some Narrow Line Seyfert 1(NLSy1) galaxies. This indicates the presence of relativistic jets in these sources similar to blazars and radio galaxies. In an attempt to have an idea of the intranight optical variability (INOV) characteristics of these ��-ray loud NLSy1 galaxies, we have carried out optical flux monitoring observations of three NLSy1 galaxies detected by {\it Fermi}/LAT: 1H 0323+342, PMN J0948+0022 and PKS 1502+036. These optical monitoring observations showed the presence of rapid optical flux variations in these sources. The intranight differential light curves of these sources have revealed flux variations on time scales of hours with amplitudes of variability > 3 percent for most of the time. On using the {\it F}-statistics to classify the variability nature of these sources, we obtained a duty cycle (DC) of INOV of ~85 percent. Alternatively, the more commonly used {\it C}-statistics gave a DC of INOV of ~57 percent. Such high DC of INOV are characteristics of the BL Lac class of AGN. The results of our monitoring observations thus indicate that there is similarity in the INOV nature of ��-ray loud NLSy1 galaxies and BL Lac objects, arguing strongly for the presence of relativistic jets aligned closely to the observers line of sight. Moreover, our dense monitoring observations on some of the nights have led to the clear detection of some mini-flares superimposed on the flux variations during the night over timescales as short as 12 minutes. The detection of short timescale flux variability in the sources studied here is clearly due to stronger time compression leading to the jets in these sources having large Doppler factors, similar to that of the inner jets of TeV blazars., 10 pages, 5 figures, to be appeared in MNRAS

Published
2012
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22. Evolution of the Type IIb SN 2011fu

Author

Pandey, S. B, Kumar, B, Sahu, D. K, Vinko, J, Moskvitin, A. S, Anupama, G. C, Bhatt, V. K, Ordasi, A, Nagy, A, Sokolov, V. V, Sokolova, T. N, Komarova, V. N, Bose, S, Roy, R, Sagar, R, Pandey, S. B, Kumar, B, Sahu, D. K, Vinko, J, Moskvitin, A. S, Anupama, G. C, Bhatt, V. K, Ordasi, A, Nagy, A, Sokolov, V. V, Sokolova, T. N, Komarova, V. N, Bose, S, Roy, R, and Sagar, R

Abstract

Restricted Access, The UBVRI photometric follow-up of SN 2011fu has been initiated a few days after the explosion, shows a rise followed by steep decay in all bands and shares properties very similar to that seen in case of SN 1993J, with a possible detection of the adiabatic cooling phase at very early epochs. The spectral modeling performed with SYNOW suggests that the early-phase line velocities for H and Fe ii features were ~ 16000 km s−1 and ~ 14000 km s−1, respectively. Studies of rare class of type IIb SNe are important to understand the evolution of the possible progenitors of core-collapse SNe in more details.

Published
2014

25. Light curve and spectral evolution of the Type IIb supernova 2011fu

Author

Kumar, Brajesh, primary, Pandey, S. B., additional, Sahu, D. K., additional, Vinko, J., additional, Moskvitin, A. S., additional, Anupama, G. C., additional, Bhatt, V. K., additional, Ordasi, A., additional, Nagy, A., additional, Sokolov, V. V., additional, Sokolova, T. N., additional, Komarova, V. N., additional, Kumar, Brijesh, additional, Bose, Subhash, additional, Roy, Rupak, additional, and Sagar, Ram, additional

Published
2013
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26. Evolution of the Type IIb SN 2011fu

Author

Pandey, S. B., primary, Kumar, Brajesh, additional, Sahu, D. K., additional, Vinko, J., additional, Moskvitin, A. S., additional, Anupama, G. C., additional, Bhatt, V. K., additional, Ordasi, A., additional, Nagy, A., additional, Sokolov, V. V., additional, Sokolova, T. N., additional, Komarova, V. N., additional, Kumar, Brijesh, additional, Bose, Subhash, additional, Roy, Rupak, additional, and Sagar, Ram, additional

Published
2013
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30. Fractal Branching Model for Non-Destructive Biomass Estimation in Terminalia chebula and Emblica officinalis Agroforestry Plantations.

Author

Panwar, Pankaj, Pal, Sharmistha, Bhatt, V. K., Prasad, Ram, Kaushal, Rajesh, and Alam, N. M.

Subjects
TERMINALIA chebula, FRACTAL analysis, BIOMASS estimation, FOREST biomass, PLANT biomass, AGROFORESTRY
Abstract

Fractal branching model is a non-destructive tool for biomass estimation. In the present paper we compared estimates of above ground tree biomass of Terminalia chebula and Emblica officinalis using usual method of biomass estimates and by employing Fractal Branching Analysis (FBA) model. Allometric equations were developed through FBA for above ground biomass of Terminalia chebula (B=0.1296D 2.0827), branch biomass (B=0.0103D 2.5388) and leaves+twig biomass (B=0.0529D 1.3269). Similarly, equations were developed for Embilica officinalis for above ground biomass B=0.0655 D 2.4042), branch biomass (B=0.0007 D 3.35108) and for leaves+twig (B=0.0656 D 1.621) (where B is Biomass and D is diameter of tree at breast height). While comparing the biomass estimate of both the methods using different descriptive statistics it was found that biomass equations developed through FBA model can fairly estimate the biomass as Maximum Error (ME) values ranged from 0.1 to 0.385 in Terminalia and from 0.068 to 0.289 in Embilica. The Coefficient of Residual Mass (CRM) values for both the species were also less than and near to one signifying good prediction by the FBA model. The experiment also showed that the method is fairly accurate and estimation for large number of trees, with different diameters, can be generated through the model thus saving precious time and resources. [ABSTRACT FROM AUTHOR]

Published
2014
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32. Hormonal Profile in Peri-Partuirient Buffaloes with Cervico-Vaginal Prolapse.

Author

Sharma, B. L., Bhatt, V. K., Jain, S. K., Shukla, S. N., Shukla, M. K., and Quadri, M. A.

Abstract

The article discusses a study which examined the concentration of major steroid hormones in buffaloes with antepartum cervico-vaginal prolapse during the peripartum period. It cited some factors contributing to antepartum cervico-vaginal prolapse. Topics covered include the materials and methods used in the study, possible causes of lowered plasma progesterone concentration after parturition, and the effect of prolapse on the reproduction system of buffaloes.

Published
2014

33. Stochastic modelling of the sediment load of the upper Yangtze River (China)

Author

Gangyan, Zhou, Goel, N. K., and Bhatt, V. K.

Abstract

The temporal and spatial sediment load characteristics of Asia's longest river, the Yangtze, have been examined. Annual and monthly sediment load characteristics in the temporal domain were modelled. The annual sediment load data from 1950 to 1990 and monthly sediment load data from 1950 to 1969 were used. Statistical tests such as the turning point test, Kendall's rank correlation test and Anderson's correlogram test were applied for randomness and trend identification. The periodicity in the sediment load data was analysed by harmonic analysis and stochastic component was modelled by auto-regressive model. The results indicate that the annual sediment load series is trend free at 5% significance level and the monthly means and standard deviations of sediment load show periodicity. The month-to-month correlation structure is nonstationary. Using the AR(1) model for the dependent stochastic component, 100 years of monthly sediment data were generated. The monthly means of observed and generated data match well.

Published
2002
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34. Fungal Planet description sheets: 1112-1181.

Author

Crous PW, Cowan DA, Maggs-Kölling G, Yilmaz N, Larsson E, Angelini C, Brandrud TE, Dearnaley JDW, Dima B, Dovana F, Fechner N, García D, Gené J, Halling RE, Houbraken J, Leonard P, Luangsa-Ard JJ, Noisripoom W, Rea-Ireland AE, Ševčíková H, Smyth CW, Vizzini A, Adam JD, Adams GC, Alexandrova AV, Alizadeh A, Duarte EÁ, Andjic V, Antonín V, Arenas F, Assabgui R, Ballarà J, Banwell A, Berraf-Tebbal A, Bhatt VK, Bonito G, Botha W, Burgess TI, Caboň M, Calvert J, Carvalhais LC, Courtecuisse R, Cullington P, Davoodian N, Decock CA, Dimitrov R, Di Piazza S, Drenth A, Dumez S, Eichmeier A, Etayo J, Fernández I, Fiard JP, Fournier J, Fuentes-Aponte S, Ghanbary MAT, Ghorbani G, Giraldo A, Glushakova AM, Gouliamova DE, Guarro J, Halleen F, Hampe F, Hernández-Restrepo M, Iturrieta-González I, Jeppson M, Kachalkin AV, Karimi O, Khalid AN, Khonsanit A, Kim JI, Kim K, Kiran M, Krisai-Greilhuber I, Kučera V, Kušan I, Langenhoven SD, Lebel T, Lebeuf R, Liimatainen K, Linde C, Lindner DL, Lombard L, Mahamedi AE, Matočec N, Maxwell A, May TW, McTaggart AR, Meijer M, Mešić A, Mileto AJ, Miller AN, Molia A, Mongkolsamrit S, Cortés CM, Muñoz-Mohedano J, Morte A, Morozova OV, Mostert L, Mostowfizadeh-Ghalamfarsa R, Nagy LG, Navarro-Ródenas A, Örstadius L, Overton BE, Papp V, Para R, Peintner U, Pham THG, Pordel A, Pošta A, Rodríguez A, Romberg M, Sandoval-Denis M, Seifert KA, Semwal KC, Sewall BJ, Shivas RG, Slovák M, Smith K, Spetik M, Spies CFJ, Syme K, Tasanathai K, Thorn RG, Tkalčec Z, Tomashevskaya MA, Torres-Garcia D, Ullah Z, Visagie CM, Voitk A, Winton LM, and Groenewald JZ

Abstract

Novel species of fungi described in this study include those from various countries as follows: Australia , Austroboletus asper on soil, Cylindromonium alloxyli on leaves of Alloxylon pinnatum, Davidhawksworthia quintiniae on leaves of Quintinia sieberi, Exophiala prostantherae on leaves of Prostanthera sp., Lactifluus lactiglaucus on soil, Linteromyces quintiniae (incl. Linteromyces gen. nov.) on leaves of Quintinia sieberi , Lophotrichus medusoides from stem tissue of Citrus garrawayi , Mycena pulchra on soil, Neocalonectria tristaniopsidis (incl. Neocalonectria gen. nov.) and Xyladictyochaeta tristaniopsidis on leaves of Tristaniopsis collina, Parasarocladium tasmanniae on leaves of Tasmannia insipida , Phytophthora aquae-cooljarloo from pond water, Serendipita whamiae as endophyte from roots of Eriochilus cucullatus , Veloboletus limbatus (incl. Veloboletus gen. nov.) on soil. Austria , Cortinarius glaucoelotus on soil. Bulgaria , Suhomyces rilaensis from the gut of Bolitophagus interruptus found on a Polyporus sp. Canada , Cantharellus betularum among leaf litter of Betula , Penicillium saanichii from house dust. Chile , Circinella lampensis on soil, Exophiala embothrii from rhizosphere of Embothrium coccineum. China , Colletotrichum cycadis on leaves of Cycas revoluta. Croatia , Phialocephala melitaea on fallen branch of Pinus halepensis . Czech Republic , Geoglossum jirinae on soil, Pyrenochaetopsis rajhradensis from dead wood of Buxus sempervirens. Dominican Republic , Amanita domingensis on litter of deciduous wood, Melanoleuca dominicana on forest litter. France , Crinipellis nigrolamellata (Martinique) on leaves of Pisonia fragrans , Talaromyces pulveris from bore dust of Xestobium rufovillosum infesting floorboards. French Guiana , Hypoxylon hepaticolor on dead corticated branch. Great Britain , Inocybe ionolepis on soil. India , Cortinarius indopurpurascens among leaf litter of Quercus leucotrichophora. Iran , Pseudopyricularia javanii on infected leaves of Cyperus sp., Xenomonodictys iranica (incl. Xenomonodictys gen. nov.) on wood of Fagus orientalis. Italy , Penicillium vallebormidaense from compost. Namibia , Alternaria mirabibensis on plant litter, Curvularia moringae and Moringomyces phantasmae (incl. Moringomyces gen. nov.) on leaves and flowers of Moringa ovalifolia, Gobabebomyces vachelliae (incl. Gobabebomyces gen. nov.) on leaves of Vachellia erioloba, Preussia procaviae on dung of Procavia capensis. Pakistan , Russula shawarensis from soil on forest floor. Russia , Cyberlindnera dauci from Daucus carota . South Africa , Acremonium behniae on leaves of Behnia reticulata, Dothiora aloidendri and Hantamomyces aloidendri (incl. Hantamomyces gen. nov.) on leaves of Aloidendron dichotomum , Endoconidioma euphorbiae on leaves of Euphorbia mauritanica , Eucasphaeria proteae on leaves of Protea neriifolia , Exophiala mali from inner fruit tissue of Malus sp., Graminopassalora geissorhizae on leaves of Geissorhiza splendidissima , Neocamarosporium leipoldtiae on leaves of Leipoldtia schultzii , Neocladosporium osteospermi on leaf spots of Osteospermum moniliferum , Neometulocladosporiella seifertii on leaves of Combretum caffrum , Paramyrothecium pituitipietianum on stems of Grielum humifusum , Phytopythium paucipapillatum from roots of Vitis sp., Stemphylium carpobroti and Verrucocladosporium carpobroti on leaves of Carpobrotus quadrifolius , Suttonomyces cephalophylli on leaves of Cephalophyllum pilansii . Sweden , Coprinopsis rubra on cow dung, Elaphomyces nemoreus from deciduous woodlands. Spain , Polyscytalum pini-canariensis on needles of Pinus canariensis , Pseudosubramaniomyces septatus from stream sediment, Tuber lusitanicum on soil under Quercus suber. Thailand , Tolypocladium flavonigrum on Elaphomyces sp. USA , Chaetothyrina spondiadis on fruits of Spondias mombin, Gymnascella minnisii from bat guano, Juncomyces patwiniorum on culms of Juncus effusus , Moelleriella puertoricoensis on scale insect, Neodothiora populina (incl. Neodothiora gen. nov.) on stem cankers of Populus tremuloides , Pseudogymnoascus palmeri from cave sediment. Vietnam , Cyphellophora vietnamensis on leaf litter, Tylopilus subotsuensis on soil in montane evergreen broadleaf forest. Morphological and culture characteristics are supported by DNA barcodes., (© 2020 Naturalis Biodiversity Center & Westerdijk Fungal Biodiversity Institute.)

Published
2020
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