Spectral Characteristics of Some Horticultural and Vegetable Crops at Different Growth Stages     

R C Dubey  S N Bidyanta  U P Deshpande  S D Gaikwad  R G Dekhane 《Journal of the Indian Society of Remote Sensing》1996,24(4):273-279

Ground based remote sensing experiments using multispectral radiometer were condueted during December 1992 to March 1993, at horticultural field of Mahatma Phule Krishi Vidyapeeth, located in Pune, over banana, grapes, brinjal and tomato crops for studying the spectral response at different growth stages and vigour. The spectral characteristics and the various vegetative indices of diseased and healthy plants are discussed in this paper. Besides its significance in ground based remote sensing, these studies may be helpful for decision making in the area of condition assessment of crops through satellite remote sensing, as the spectral bands of the radiometer used in this experiment are similar to those of IRS and Landsat satellites. Moreover, the growth profiles of brinjal and banana crops can be useful in the area of crop and vegetable discrimination.  相似文献   

Contaminant levels in the muscle of four species of fish important to the recreational fishery of the New York Bight Apex     

Deshpande AD  Draxler AF  Zdanowicz VS  Schrock ME  Paulson AJ 《Marine pollution bulletin》2002,44(2):164-171

  相似文献   

Monsoon-extratropical circulation interactions in Himalayan extreme rainfall     

Ramesh K. Vellore  Michael L. Kaplan  R. Krishnan  John M. Lewis  Sudhir Sabade  Nayana Deshpande  Bhupendra B. Singh  R. K. Madhura  M. V. S. Rama Rao 《Climate Dynamics》2016,46(11-12):3517-3546

  相似文献   

Frequency dependence of equatorial ionospheric scintillations     

M R Deshpande  R G Rastogi  Hari Om Vats  K Davies 《Journal of Earth System Science》1978,87(7):173-178

Simultaneous observations of amplitude scintillations at 40 MHz, 140 MHz and 360 MHz radiated from ATS-6 satellite at 34° E longitude were made at Ootacamund near the magnetic equator in India. It has been found that the frequency variation of scintillation index (S ₄) isS ₄ ∞f ^?n , withn being about 1·2 only for weak scintillations, i.e., so long as the scintillation index does not exceed 0·6 at the lower frequency. For strong scintillations (S ₄>0·6) where multiple scattering may be present, the exponentn itself is a function of the intensity of scintillation, the scintillation indices at two frequencies are related by:S ₄(f ₁)=S ₄(f ₂) exp [1·3 log(f ₂/f ₁)(1?S ₄(f ₂)] so long asf ₂/f ₁≤3. Thus knowing scintillation index at a given frequency one can estimate the scintillation index at another frequency. This will be of significant importance for communication problems. Evidence is also shown for the reversal of the frequency law in cases of intense scintillations.  相似文献   

Climates of urbanization: local experiences of water security,conflict and cooperation in peri-urban South-Asia   总被引：1，自引：0，他引：1  

Dik Roth  Muhammad Shah Alam Khan  Israt Jahan  Rezaur Rahman  Vishal Narain  Aditya Kumar Singh 《Climate Policy》2019,19(6):S78-S93

ABSTRACT

This article explores changing water (in)securities in a context of urbanization and climate change in the peri-urban spaces of four South-Asian cities: Khulna (Bangladesh), Gurugram and Hyderabad (India), and Kathmandu (Nepal). As awareness of water challenges like intensifying use, deteriorating quality and climate change is growing, water security gets more scientific and policy attention. However, in peri-urban areas, the dynamic zones between the urban and the rural, it remains under-researched, despite the specific characteristics of these spaces: intensifying flows of goods, resources, people, and technologies; diversifying uses of, and growing pressures on land and water; and complex and often contradictory governance and jurisdictional institutions. This article analyses local experiences of water (in-)security, conflict and cooperation in relation to existing policies. It uses insights from the analysis of the case studies as a point of departure for a critical reflection on whether a ‘community resilience’ discourse contributes to better understanding these cases of water insecurity and conflict, and to better policy solutions. The authors argue that a community resilience focus risks neglecting important insights about how peri-urban water insecurity problems are experienced by peri-urban populations and produced or reproduced in specific socio-economic, political and policy contexts. Unless supported by in-depth hydro-social research, such a focus may depoliticize basically political questions of water (re) allocation, prioritization, and access for marginalized groups. Therefore, the authors plead for more critical awareness among researchers and policy-makers of the consequences of using a ‘community resilience’ discourse for making sense of peri-urban water (in-)security.

Key policy insights

• There is an urgent need for more (critical) policy and scientific attention to peri-urban water insecurity, conflict, and climate change.

• Although a changing climate will likely play a role, more attention is needed to how water insecurities and vulnerabilities in South Asia are socially produced.

• Researchers and policy-makers should avoid using depoliticized (community) resilience approaches for basically socio-political problems.

  相似文献   

Biosorption of Toxic Heavy Metals on Sawdust          下载免费PDF全文

Vishal Mishra  Srinivas Tadepalli 《洁净——土壤、空气、水》2015,43(3):360-367

  相似文献   

Geochemical appraisal of mine discharge and tailing at Malanjkhand copper mine,India     

Sk. Md. Equeenuddin  Abhijit Panda  Vishal Singh  Prafulla Kumar Sahoo  Subhashis Sahu  Sumit Kumar Basantray 《Journal of the Geological Society of India》2017,89(2):209-215

Geophysical investigation using Vertical Electrical Sounding (VES), Electrical Resistivity Tomography (ERT) and Seismic Refraction at a proposed conference center site along Ajibode-Labani road, Ibadan, southwestern Nigeria has been carried out. The investigation aims at characterizing and delineating the subsurface strata to understand the weathered profile at the site. Understanding the weathered profile is essential in determining the suitability of the site for engineering construction of the future conference center. A total of 25 VES and 10 ERT profiles were acquired in a systematic grid pattern using both Schlumberger andWenner configurations with Allied omega terrameter. TheVES data were processed and analyzed using WinResist and the ERT data were inverted using RES2DINV. The data were combined to form a 3-D data set of the site and RES3DINV was used to produce the depth slices. Seismic refraction data were also acquired with an ABEM seismograph and processed using SeisImager and Fajseis software. Seismic data were used in understanding the velocity distribution and thickness. The results of VES, ERT and seismic refraction show good correlation. Four sub-surface layers were delineated: top layer of reworked sand, clayey sand/ lateritic hard pan, clay/ sandy clay and fracture/ fresh basement. The 3-D model permits a pictorial view of the sub-surface in relation to materials that overlie the basement. The thickness of unconsolidated materials to bedrock varies from 2.7 m to 12.2 m which revealed inhomogeneity in weathering under the shallow sub-surface. It is found that the integrated geophysical tool is well suited to characterize and delineate sub-surface structure (weathered profile) for engineering site characterization.  相似文献   

Ultra-low-frequency (ULF) and total electron content (TEC) anomalies observed at Agra and their association with regional earthquakes     

Vishal Chauhan  O.P. Singh  Vinod Kushwah  Vikram Singh  Birbal Singh 《Journal of Geodynamics》2009,48(2):68-74

Employing a three-component search coil magnetometer (f = 0.01–30 Hz) the ultra-low-frequency (ULF) magnetic field observations have been taken in a noise free rural site at Bichpuri, Agra, India since 20 April 2007. We have analysed 7 months of night time data from 01 May to 30 November 2007. The data show seven occurrences of ULF bursts with periods ranging from a few minutes to an hour in a wide frequency range up to 15 Hz. The occurrence of such ULF bursts has been statistically analysed. The polarization parameter analysis shows that two of these bursts occurred from sources in the ionosphere and magnetosphere (Z/X < 1). It is further seen that four bursts correlated very well with some regional earthquakes (M > 4.5), which occurred at distances less than 628 km from the observation site at Agra. In some cases the bursts occurred 1–3 days prior to the main shocks.Since earthquakes are also known to perturb the ionosphere, we have analysed total electron content (TEC) data obtained from a GPS receiver stationed at Agra since June 2006. Analysis of the data for the same period as the magnetic field observations shows that there existed TEC anomalies on all the days when ULF bursts occurred. The TEC anomalies show enhancement and depletion in the data in all cases. While the mechanisms of the ULF and TEC anomalies are not well known, it is expected that the ULF bursts occurred due to microfracturing of the earth's crust during stress accumulation and that the TEC anomalies occurred as a result of the electric field induced in the ionosphere during such processes.  相似文献   

Responses of phytoplankton and its satellite bacteria to exogenous ethanol     

Abate  Rediat  Hetharua  Buce Hanoch  Patil  Vishal  Lin  Daner  Kifle  Demeke  Liang  Junrong  Chen  Changping  Sun  Lin  Kao  Shuh-Ji  Bi  Yonghong  Huang  Bangqin  Gao  Yahui 《中国海洋湖沼学报》2023,41(1):203-214

Journal of Oceanology and Limnology - The response of phytoplankton and its satellite bacteria to various concentrations (0.01%–10% v/v) of ethanol is studied. To elucidate the effect of...  相似文献   

Organochlorine contaminants in the muscle of striped bass illegally harvested from shad gill nets in the Hudson River Estuary     

Deshpande AD  Doyle SA  Dockum BW  Tesolin-Gee A 《Marine pollution bulletin》2008,56(12):2088-2093

  相似文献