Browsing by Author "Fernandes, D."
Now showing items 1-14 of 14
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Ablation and chemical alteration of cosmic dust particles during entry into the earth`s atmosphere
Rudraswami, N.G.; ShyamPrasad, M.; Dey, S.; Plane, J.M.C.; Feng, W.; Carrillo-Sanchez, J.D.; Fernandes, D. (American Astronomical Society, 2016)Most dust-sized cosmic particles undergo ablation and chemical alteration during atmospheric entry, which alters their original properties. A comprehensive understanding of this process is essential in order to decipher ... -
Extraterrestrial dust as a source of bioavailable iron contributing to the ocean for driving primary productivity
Rudraswami, N.G.; Pandey, M.; Genge, M.J.; Fernandes, D. (Wiley, 2021)Bioavailable Fe is an essential nutrient for phytoplankton that enables the organisms to flourish and draw down atmospheric CO2 thus affecting global climatic conditions. In marine locales, remote from the continents, ... -
Fine-grained volatile components ubiquitous in solar nebula: Corroboration from scoriaceous cosmic spherules
Rudraswami, N.G.; Fernandes, D.; Naik, A.K.; ShyamPrasad, M.; Taylor, S. (John Wiley & Sons, 2018)The scoriaceous cosmic spherules (CSs) that make up to a few percent (for sizes >150 -m size) of total micrometeorite flux are ubiquitous and have remained enigmatic. The present work provides in-depth study of 81 scoriaceous ... -
Impact of offshore placer mining experiments (PLAMEX) on the sediment size and heavy minerals
Valsangkar, A.B.; Fernandes, D. (Current Science Association, 2009)Two offshore placer mining experiments (PLAMEX) were conducted using submersible pumps specially designed by Central Mechanical Engineering Research Institute (CMERI), Durgapur (India) at 8 m water depth in Kalbadevi Bay ... -
Influence of anthropogenic activities on the existing environmental conditions of Kandla Creek (Gulf of Kutch)
Shirodkar, P.V.; Pradhan, U.K.; Fernandes, D.; Haldankar, S.R.; Rao, G.S. (Current Science Association, 2010)Water characteristics of Kandla creek, monitored seasonally from 2002 to 2006 at four locations (mouth, cargo jetty, oil jetty and junction), indicated significant increases in nutrients, petroleum hydrocarbons (PHc) and ... -
Oxygen Ablation during Atmospheric Entry: Its Influence on the Isotopic Composition of Micrometeorites
Rudraswami, N.G.; Pandey, M.; Fernandes, D.; Carrillo-Sanchez, J.D.; Feng, W.; Plane, J.M.C.; Singh, Vijay (IOP Publishing, 2022)Micrometeorites (MMs) offer glimpses of the diverse nature of parent bodies that accreted during the first few million years after the formation of the proto-Sun.The present work explores this by evaluating the ablation ... -
Oxygen isotopic and chemical composition of chromites in micrometeorites: Evidence of ordinary chondrite precursors
Rudraswami, N.G.; Marrocchi, Y.; ShyamPrasad, M.; Fernandes, D.; Villeneuve, J.; Taylor, S. (2019)We identified 66 chromite grains from 42 of ~5000 micrometeorites collected from Indian Ocean deep-sea sediments and the South Pole water well. To determine the chromite grains precursors and their contribution to the ... -
Perceptive of the pyroxene-bearing micrometeorites and their relation to chondrites
Rudraswami, N.G.; Fernandes, D.; DeAraujo, A.; ShyamPrasad, M.; Taylor, S. (John Wiley & Sons, 2018)We studied 149 pyroxenes from 69 pyroxene-bearing micrometeorites collected from deep-sea sediments of the Indian Ocean and South Pole Water Well at Antarctica, Amundsen-Scott South Pole station. The minor elements in ... -
Pre- and post-monsoonal changes in grain size and heavy minerals in the sediments from Kalbadevi Bay, Ratnagiri, west coast of India
Valsangkar, A.B.; Fernandes, D. (NISCAIR (CSIR), 2011)Sediments from the Kalbadevi Bay, Ratnagiri collected during January, May and October have been studied for processes responsible for the observed grain size variations and heavy mineral distribution. The study shows ... -
Relict olivines in micrometeorites: Precursors and interactions in the earth`s atmosphere
Rudraswami, N.G.; ShyamPrasad, M.; Dey, S.; Fernandes, D.; Plane, J.M.C.; Feng, W.; Taylor, S.; Carrillo-Sanchez, J.D. (American Astronomical Society, 2016)Antarctica micrometeorites (~1200) and cosmic spherules (~5000) from deep sea sediments are studied using electron microscopy to identify Mg-rich olivine grains in order to determine the nature of the particle precursors. ... -
Selective Disparity of Ordinary Chondritic Precursors in Micrometeorite Flux
Rudraswami, N.G.; Fernandes, D.; Naik, A.K.; ShyamPrasad, M.; Carrillo-Sánchez, J.D.; Plane, J.M.C.; Feng, W.; Taylor, S. (IOP Publishing, 2018)All known extraterrestrial dust (micrometeoroids) entering the Earth's atmosphere is anticipated to have a significant contribution from ordinary chondritic precursors, as seen in meteorites, but this is an apparent ... -
Sources and preservation dynamics of organic matter in surface sediments of Narmada River, India - Illustrated by amino acids
Fernandes, D.; Wu, Y.; Shirodkar, P.V.; Pradhan, U.K.; Zhang, J.; Limbu, S.M. (2020)The preservation process of organic matter (OM) in estuarine environments determines the recycling and sinking of nutrients. This process requires the identification of sources, degradation states and the main processes ... -
Spatial and temporal variations in source, diagenesis, and fate of organic matter in sediments of the Netravati River, India
Fernandes, D.; Wu, Y.; Shirodkar, P.V.; Pradhan, U.K.; Zhu, Z.Y.; Zhang, J.; Limbu, S.M. (2019)Organic matter (OM) such as organic nitrogen plays a substantial role in the global biogeochemical cycling of bio-reactive components-amino acids (AA) in aquatic environments. Spatial and temporal variations in source, ... -
रत्नागिरी के कालबादेवी खाडी की ख्ननिज सम्पदा पर मान्सून का प्रभाव
Valsangkar, A.B.; Fernandes, D. (National Institute of Oceanography (CSIR), India, 2012)