Now showing items 4011-4030 of 9513

    • Variation in size, morphology and chemical composition of polymetallic nodules from the Central Indian Ocean Basin 

      Valsangkar, A.B.; Karisiddaiah, S.M.; Parthiban, G. (Oxford and IBH, New Delhi, 1992)
      Chemical composition of 613 polymetallic nodules from 150 stations in the Central Indian Ocean Basin (CIOB) are determined and variations in Mn, Fe, Cu, Ni, Co, Zn and moisture content are studied with respect to their ...
    • Programmable delay circuit for sparker signal analysis 

      Pathak, D. (CUSAT, Kochi, 1992)
      The sparker echo signal had been recorded along with the EPC recorder trigger on audio cassettes in a dual channel analog recorder. The sparker signal in the analog form had to be digitised for further signal processing ...
    • Acoustic doppler methods for remote measurements of ocean flows - a review 

      Joseph, A. (Indian Society for Physical Sciences of the Oceans, 1992)
      The evolution of acoustic doppler methods for remote measurements of ocean flows has been briefly reviewed in historical perspective. Both Eulerian and profiling methods have been discussed. Although the first acoustic ...
    • A marine meteorological data acquisition system 

      Desai, R.G.P.; Desa, E.; Vithayathil, G. (Oxford and IBH, New Delhi, 1992)
      A marine meteorological data acquisition system has been developed for long term unattended measurements at remote coastal sites, ocean surface platforms and for use on board research vessels. The system has an open and ...
    • A geological and geophysical data collection system 

      Sudhakar, T.; Afzulpurkar, S. (CUSAT, Kochi, 1992)
      A geological and geophysical data collection system using a Personal Computer is described below. The system stores data obtained from various survey systems typically installed in a charter vessel and can be used for ...
    • A new device for monitoring moorings 

      Namboothiri, E.G.; Krishnakumar, V. (Indian Society for Physical Sciences of the Oceans, 1992)
      A new device - Mooring Monitoring Unit (MMU), which consists of an inwater unit and a deck unit has been designed to monitor mooring in situ. This device helps tracing underwater moorings, once its marker buoy is removed ...
    • PCs and networking for oceanographic research vessels 

      Desai, R.G.P.; Desa, E.; Vithayathil, G. (Indian Society for Physical Sciences of the Oceans, 1992)
      This paper, first describes briefly the evolution of data acquisition techniques and different system implementation, on board research vessels. A data acquisition system being developed for a coastal research vessel is ...
    • The design of an in-water optical radiometer 

      Desa, E.S.; Desa, B.A.E.; DeSa, E.J. (Indian Society for Physical Sciences of the Oceans, 1992)
      In-water radiometers which measure the spectral composition of the sub-surface light field can be used to correctly classify water types through an estimation of biogenous and non-biogenous matter present in the ocean, and ...
    • Image sensors for radiometric measurements in the ocean 

      Desa, E.S.; Desa, B.A.E. (Oxford and IBH, New Delhi, 1992)
      The signal to noise (SNR) performance of selected linear array image sensors belonging to the CCD (charge coupled device), SSPDA (self scanning photodiode array), and PCD (plasma coupled device) families is analysed. Our ...
    • Nodule bottom backscattering study using multibeam echosounder 

      Chakraborty, B.; Raju, Y.S.N.; Nair, R.R. (CUSAT, Kochi, 1992)
      A study is carried out to observe the angular dependence of backscattering strength at nodule area where grab sample and photographic data is available. Theoretical study along with the experimentally observed data shows ...
    • Multibeam swath bathymetry signal processing techniques 

      Ranade, G.; Sudhakar, T. (CUSAT, Kochi, 1992)
      Mathematical advances and the advances in the real time signal processing techniques in the recent times, have considerably improved the state of art in the bathymetry systems. These improvements have helped in developing ...
    • Chemistry of the sea-surface microlayer. 3. Studies on the nutrient chemistry of the northern Arabian Sea 

      Singbal, S.Y.S.; Narvekar, P.V.; Nagarajan, R. (Oxford and IBH, New Delhi, 1992)
      Nutrients showed enrichment in the surface microlayer compared to those in sub-surface water and there was a decreasing trend in the enrichment factor from nearshore to offshore in Northern Arabian Sea. The nutrient ...
    • Evaluation of toxic trace metals Cd and Pb in Arabian Sea waters 

      Sanzgiri, S.; Mesquita, A.; Kureishy, T.W.; SenGupta, R. (Oxford and IBH, New Delhi, 1992)
      An attempt has been made to present a picture of the distribution of toxic trace elements Cd and Pb in the Northern Arabian Sea by applying an improved analytical technique for the detection of dissolved forms of the metals ...
    • Minor sterols from the sponge Ircinia ramosa (Killer) 

      Parameswaran, P.S.; Naik, C.G.; Das, B.; Kamat, S.Y. (Oxford and IBH, New Delhi, 1992)
      Three sterols, isolated from the lipid fraction of the sponge Ircinia ramosa were characterised as cholest-5-en-3 beta-ol-7-one (7-oxo cholesterol, 1), cholest 5-23-dien-b beta ol-7-one (7-oxo demosterol, 2) and 24E-ethyl ...
    • Organochlorine pesticide residues in the northern Indian Ocean 

      Shailaja, M.S.; Sarkar, A. (Oxford and IBH, New Delhi, 1992)
      The coastal waters of India receive about 4.4Km sup(3) of domestic sewage and 0.44 Km sup(3) of industrial wastes, annually. A concerted effort is being made for about a decade now to assess the state of the Indian marine ...
    • Corrosion of mild steel, copper and brass in crude oil / seawater mixture 

      PrabhaDevi; Sawant, S.S.; Wagh, A.B. (NISCAIR, New Delhi, 1992)
      Mild steel, copper and brass coupons were introduced in natural seawater containing varying amount of crude oil. Mild steel showed higher rate of corrosion in seawater containing oil and lower corrosion rate in natural as ...
    • On chlorinated hydrocarbons in the Indian Ocean 

      Sarkar, A.; SenGupta, R. (Oxford and IBH, New Delhi, 1992)
      The data available on the distribution of organochlorine compounds such as DDT and its metabolites, aldrin, dieldrin, endrin, isomers of HCH and the PCBs in the sediments, water, zooplankton, fish and seals from the Indian ...
    • Distribution of particulate organic matter in Rajapur and Vagothan estuarines (west coast of India) 

      Tulaskar, A.S.; Sawant, S.S.; Wagh, A.B. (NISCAIR, New Delhi, 1992)
      The distribution of particulate organic carbon (POC), particulate carbohydrates (PCHO) and particulate proteins (PP) in the suspended particulate matter was studied. The POC, PCHO and PP concentrations ranged from 176 to ...
    • Inorganic combined nitrogen budget of the Arabian Sea: Some geochemical and climatic implications 

      Naqvi, S.W.A. (Waseda University, Tokyo, 1992)
      Estimates of the local sources and sinks of inorganic combined nitrogen in the Arabian Sea suggest a net loss of sup(-)3 x 10 sup(13) gN y sup(-1). This seems to be made up largely by the upward flux facilitatEd. by a high ...
    • Bioactivity of marine organisms. 6. Antiviral evaluation of marine algal extracts from the Indian coast 

      Kamat, S.Y.; Wahidullah, S.; DeSouza, L.; Naik, C.G.; Ambiye, V.; Bhakuni, D.S.; Goel, A.K.; Garg, H.S.; Srimal, R.C. (Walter de Gruyter, Berlin, 1992)
      Ethanolic extracts of Indian marine algae belonging to the Rhodophyceae, Phaeophyceae and Chlorophyceae were tested for anti-semiliki Forest (SFV), Ranikhet Disease (RDV) and Vaccinia (VV) viruses. In the primary screening ...