Assessment of Ground Water Quality with Respect to Bacteriological Contamination in Bhavnagar,Gujarat, India          下载免费PDF全文

Mittal Patel  Krushnakant Baxi  Paras Dayma  Devang Upadhyay  Navalsang Parmar  Soumya Haldar  Bhavanath Jha 《洁净——土壤、空气、水》2014,42(10):1351-1362

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Estimation of Sea Surface Temperature (SST) Using Marine Seismic Data     

Satish Kumar Sinha  Pawan Dewangan  Kalachand Sain 《Pure and Applied Geophysics》2016,173(4):1305-1316

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An investigation on tolerance and accumulation of a facultative marine fungus <Emphasis Type="Italic">Aspergillus flavus</Emphasis> to pentavalent arsenic     

Anjana K. Vala  Vipul Davariya  R. V. Upadhyay 《中国海洋大学学报(英文版)》2010,9(1):65-67

Tolerance of a facultative marine fungus Aspergillus flavus towards As (V) was tested. Luxuriant growth of the test isolate was observed in culture media with As (V) concentrations of 25 mg L⁻¹ and 50 mg L⁻¹, indicating its tolerance to the metal. Accumulation rate of arsenic was always higher when exposed to As (V) at 50 mg L⁻¹ than at 25 mg L⁻¹. The study reveals Aspergillus flavus as a promising candidate for environmental bioremediation. Arsenic contents (mg g⁻¹) in the fungus when exposed to 50 mg L⁻¹ As (V) were measured as 11.1773, 4.0983, and 8.0000 mg g⁻¹ on day 3, 6 and 9, respectively. The highest content was observed initially, i.e. on day 3, followed by a decline and a rise again. These results provide baseline information for further explorations regarding the exploitation of the fungus for arsenic removal.  相似文献   

Mapping of Cropping System for the Indo-Gangetic Plain Using Multi-Date SPOT NDVI-VGT Data     

Sushma Panigrahy  Gargi Upadhyay  Shibendu Shankar Ray  Jai S. Parihar 《Journal of the Indian Society of Remote Sensing》2010,38(4):627-632

The present study has been carried out to delineate the existing cropping systems in the Indo-Gangetic Plains (IGP) using 10 day composite SPOT VEGETATION (VGT) NDVI data acquired over a crop year (June–May). Results showed that it is feasible to identify the major crops like rice, wheat, sugarcane, potato, and cotton in the dominant growing areas with good accuracy. Double cropping pattern is the most prevalent. Rice-wheat, sugarcane based, cotton-wheat, rice-potato, rice-rice, maize/millet-wheat are some of the major rotations followed. Rice-wheat is the dominant rotation accounting for around 40% of the net sown area. Triple crop rotations was less than 5% of the area and observed in some parts of Uttar Pradesh, Bihar and West Bengal. Single crop rotation of rice-fallow is significant only in West Bengal.  相似文献   

Lockdown as an Empirical Strategy to Curb Air Pollution: Evidence from a Quasi-Natural Experiment     

Manish Yadav  Nitin Kumar Singh  Bhupendra Kumar Soni  Kusum Soni  Pawan Kumar Singh 《洁净——土壤、空气、水》2023,51(1):2200059

In this study, three approaches namely parallel, sequential, and multiple linear regression are applied to analyze the local air quality improvements during the COVID-19 lockdowns. In the present work, the authors have analyzed the monitoring data of the following primary air pollutants: particulate matter (PM₁₀ and PM_2.5), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). During the lockdown period, the first phase has most noticeable impact on airquality evidenced by the parallel approach, and it has reflected a significant reduction in concentration levels of PM₁₀ (27%), PM_2.5 (19%), NO₂ (74%), SO₂ (36%), and CO (47%), respectively. In the sequential approach, a reduction in pollution levels is also observed for different pollutants, however, these results are biased due to rainfall in that period. In the multiple linear regression approach, the concentrations of primary air pollutants are selected, and set as target variables to predict their expected values during the city's lockdown period.The obtained results suggest that if a 21-days lockdown is implemented, then a reduction of 42 µg m⁻³ in PM₁₀, 23 µg m⁻³ in PM_2.5, 14 µg m⁻³ in NO₂, 2 µg m⁻³ in SO₂, and 0.7 mg m⁻³ in CO can be achieved.  相似文献   

A preliminary report of microfossils (Foraminiferida) from the Jurassic sediments of Jajiya Member,Jaisalmer Formation,Western Rajasthan     

A. Talib  Gagnesh Upadhyay  M. Haseen 《Journal of the Geological Society of India》2012,79(4):422-423

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Sorption Model for Dissolved and Leachable Particulate Aluminium in the Great Ouse Estuary, England   总被引：1，自引：0，他引：1  

S. Upadhyay 《Aquatic Geochemistry》2012,18(3):243-262

The behaviour of dissolved Al in the Great Ouse estuary, in particular with respect to salinity, is complex. There is, however, evidence from field data as well as laboratory mixing experiments to suggest that flocculation and sorption mechanisms play important roles affecting the concentrations of dissolved Al during the early stages of estuarine mixing. In contrast, a near-buffering of dissolved Al occurs in the entire stretch of the estuary (salinity >0.2) with concentrations varying around 1.4 μg l⁻¹. This distribution and lack of variation with salinity is attributable to sorption processes which might dominate over other processes in these turbid estuarine waters (suspended particulate load 48–888 mg l⁻¹) impacting dissolved Al levels. Sorption models have been developed for both dissolved and leachable particulate Al concentrations in these waters. These observations provide compelling evidence of sorption processes that might be important in the geochemistry of Al in estuarine waters.  相似文献   

No universality for the electron power-law index (p) in gamma-ray bursts and other relativistic sources     

Rongfeng Shen  Pawan Kumar  Edward L. Robinson 《Monthly notices of the Royal Astronomical Society》2006,371(3):1441-1447

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Palynological evidence for the Palaeocene evolution of the forearc basin, Indus Suture Zone, Ladakh, India     

Rajeev Upadhyay  Ram-Awatar  R. K. Kar  Anshu K. Sinha 《地学学报》2004,16(4):216-225

The discovery of Permian, Mesozoic and Palaeocene palynomorphs from the Nindam forearc basin, exposed along the Indus Suture Zone in Ladakh, is reported. The palynomorphs are from volcanogenic sandstones and are poorly preserved, distorted and show the effects of abrasion (striation marks). The frequent occurrence of Proxapertites indicates the assemblage is at least Palaeocene in age. The Palaeocene palynomorphs and sediments were transported to the Nindam trough from nearby elevated landward regions (islands). These Palaeocene provenance areas were characterized by an estuarine, nearshore, tropical, warm‐humid environment and were situated at equatorial palaeolatitudes. However, the occurrence of Permian and Mesozoic palynomorphs in the assemblage indicates that the Late Palaeozoic and Mesozoic Tethyan sedimentary rocks exposed along the northern margin of the Indian plate were redeposited into the tectonically active Cretaceous–Palaeocene trench–subduction complex that existed between the Indian and the Asian plates until the collision took place at ～50–60 Ma.  相似文献   

Reply to comments on 'Palynological evidence for the Palaeocene evolution of the forearc basin, Indus Suture Zone, Ladakh, India' by Peter Clift     

Rajeev Upadhyay 《地学学报》2005,17(2):200-201

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