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    Wyświetlanie 1-7 z 7
    Tytuł:
    Coupled Nonlinear System in (2+1) Dimension and Overturning Solitons
    Autorzy:
    Ghosh, C.
    Chowdhury, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945350.pdf
    Data publikacji:
    1996-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.90.+p
    52.35.Nx
    52.35.Sb
    Opis:
    Coupled nonlinear integrable systems in (2+1) dimension are generated from a matrix Schrodinger-type inverse problem and solved explicitly to demonstrate a new phenomenon of overturning. Both, the two- and three-dimensional graphical depictions of the solution are presented. Our analysis is an extension of the uncoupled case reported earlier by Bogoyavlenskii. A unique feature of the solution is the occurrence of arbitrary functions of (y, t) in its functional form, which significantly changes the behaviour of the solution.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 4; 459-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of phytotoxic potential among the crude extracts from Parthenium hysterophorus L. extracted with solvents of increasing polarity
    Autorzy:
    Pati, U.K.
    Chowdhury, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11232.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    comparison
    phytotoxicity
    Vigna radiata
    crude extract
    Parthenium hysterophorus
    bioassay
    hexane
    ethyl acetate
    methanol
    solvent
    Opis:
    There is a worldwide search for the safe, effective and eco-friendly compounds of plant origin to combat the weed species and other pests which are responsible for the great impact on the growth and productivity of agricultural crops. In this present study, a comparison was made to evaluate the phytotoxicity potential of sequentially extracted solvent (hexane, ethyl-acetate, methanol) extracts of Parthenium hysterophorus L. (aerial parts) in vitro through bench-top seed germination assay (Vigna radiata L.). One-way analysis of variance (ANOVA) followed by Duncan’s multiple range test (DMRT) were done for statistical analysis of the data. The study reveals that germination, growth and vigour was significantly (P<0.05) reduced by ethyl-acetate and methanol extracts. The present study concluded that phytotoxicity of ethylacetate and methanolic crude extracts of Parthenium hysterophorus could be exploited as potential bioherbicide for future weed management programme and the development of bioherbicide for commercial use.
    Źródło:
    International Letters of Natural Sciences; 2015, 06
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Darboux-Bäcklund Transformation and Positon Type Solution of Coupled Nonlinear Optical Waves
    Autorzy:
    Sen, D. C.
    Chowdhury, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014041.pdf
    Data publikacji:
    2000-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.30.+g
    52.35.Mw
    52.35.Sb
    Opis:
    A Darboux-Bäcklund transformation is used to obtain a positon type solution of the nonlinear equations describing the propagation of coupled nonlinear optical pulses.This form of the positon solution is then compared with that obtained by the special limiting procedure applied to a two-soliton solution. It is observed that though the algebraic form of the two solutions is different yet both of these have singularities and the position of the singularities remains on the similar curve in the (x,t) plane. We also depict the form of these solutions graphically. Finally, it may be added that the method of Darboux-Bäcklund transformation is convenient for generating more than one-positon solution.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 1-2; 3-10
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of bird diversity as bioindicators in two parks, Kolkata, India
    Autorzy:
    Chowdhury, R.
    Sarkar, S.
    Nandy, A.
    Talapatra, S.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11495.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    assessment
    bird diversity
    bioindicator
    vehicular traffic
    vehicular pollution
    urban park
    biomonitoring
    landscape change
    park
    Calcutta city
    India
    Opis:
    The trees of parks and gardens support many species, the survival of urban-dwelling species mainly bird species. Birds amongst other species provide a wide range of environmental and social functions to cities and urban dwellers. The present study aims to know bird diversity in two parks as bioindicator of automobile air pollution exposure, landscape changes and/or human interactions. The study areas were selected as per heavily-populated neighborhoods, nearby office buildings, nearby roads and continuous vehicular movements, human interactions as visitors, where high levels of human disturbance are common. The study was carried out at 2 sampling stations viz (i) Elliot park and (ii) Agri-horticulture Society. The bird species diversity was studied by qualitative and quantitative assessment. Indices were Species richness, Index of Dominance, Relative abundance, Shannon-Wiener Diversity Index and Evenness Index for birds for all selected sites were calculated using the statistical formulae. The present results as bioindicators bird species clearly indicate that the bird species are very few in numbers in both the parks. When comparison made between both the parks, it was observed less number of bird varieties (16 types) in Elliot park than varieties (9 types) more less in number in Agri-horticulture society. This study is a preliminary assessment of bird diversity but further researches are needed in relation to biochemical and genetic damage study as well as air pollution load by using instruments. In the present study it was concluded that the less numbers of birds and their different diversity indices were found a decreasing trends, though there no attempt has been made on physico-chemical properties of present air pollutants. The less number of varieties of bird species are as tolerant bioindicators, which may be due to the vehicular pollution and/or human interference and/or landscape changes due to nearby neighborhood blocks, office and residential buildings, continuous movement of vehicles etc.
    Źródło:
    International Letters of Natural Sciences; 2014, 11, 2
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of flower visiting insects diversity as pollinators in two parks, Kolkata, India
    Autorzy:
    Chowdhury, S.
    Sarkar, S.
    Nandy, A.
    Talapatra, S.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11677.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    assessment
    flower
    visiting insect
    diversity
    pollinator
    park
    biomonitoring
    Kolkata city zob.Calcutta city
    India
    Calcutta city
    Opis:
    Insects are depends upon autotrophs and they attract by the flowers colour and shape as pollinator. This is a mutual relationship between flowers and insects. The present study aims to determine flower visiting insect diversity as pollinators in two parks as biomonitoring of automobile air pollution exposure, landscape changes and/or human interactions. The study areas were selected as per heavily-populated neighborhoods, nearby office buildings, nearby roads and continuous vehicular movements, human interactions as visitors, where fences and high levels of human disturbance are common. The study was carried out at 2 sampling stations viz (i) Elliot park and (ii) Agri-Horticulture Society. The flower species were selected viz. Helianthus annuus, Petunia sp. and Buganvilia spectabilis planting above mentioned areas because these species are more common among other species. In each flower, diversity of visiting insects were studied by qualitative and quantitative assessment. Indices were Species richness, Index of Dominance, Relative abundance, Shannon-Wiener Diversity Index and Evenness Index for insects for all selected sites were calculated using the statistical formulae. The present results clearly indicate that the flower visiting insects are very less in numbers on three flowering species and index values were decreased. This study is a preliminary assessment of flower visiting insects diversity but further researches are needed in relation to pollination efficiencies of flower visiting insects and biochemical and genetic damage study of flowers as well as air pollution load by using instruments. It was concluded that three flowering species viz. sunflower, petunia and bougainvillea are very common both the parks but insect visitors are common but present less in number, which may be due to the vehicular pollution and/or human interference and/or landscape changes due to nearby neighborhood blocks, office and residential buildings etc.
    Źródło:
    International Letters of Natural Sciences; 2014, 10
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An empirical analysis of the impact of crude oil spot and futures prices volatility on the development of African equity markets
    ANALIZA EMPIRYCZNA WPŁYWU KRYZYSU WYDOBYCIA ROPY NAFTOWEJ I NIESTABILNOŚCI CEN TERMINOWYCH NA ROZWÓJ RYNKÓW AKCJI W KRAJACH AFRYKI
    Autorzy:
    A.O. BAKARE, Ibrahim
    O. QUADRY, Mahmud
    CHOWDHURY, Mohammad Abdul-Matin
    Powiązania:
    https://bibliotekanauki.pl/articles/434974.pdf
    Data publikacji:
    2018-03-01
    Wydawca:
    Uniwersytet Opolski
    Tematy:
    crude oil
    volatility
    equity markets
    revenue
    ropa naftowa
    ceny terminowe
    niestabilność cen
    rynki akcji
    przychody
    Opis:
    This study focused on the impact of crude oil, crude palm oil spot and futures of prices on African equity markets. It draws on daily data from January 2000 till July 2013, obtained from Bloomberg. The study employed Vector Error Correction (VEC). Findings from the econometric analysis show that there is relativity in the speed of adjustment among such countries’ equity market index as Mauritius, whose economic backbone is tourism, which responded faster compared with other ‘ equity markets. Kenya’s equity market index responded positively relative to those of Morocco and Nigeria, while South Africa’s equity market responded slowly, unlike other equity markets. The implication of Morocco and Nigeria’s equity markets adjusting slowly to the shock from crude oil market crisis was due to a high dependence of the governments of both countries on crude oil revenues in financing their economic activities. The study shows the existence of a long-term relation between crude oil, crude palm oil spot and futures prices on equity markets. The VECM Granger causality test was applied to examine the association and impact among these variables. The results indicate that crude oil spot and futures price granger influence the equity markets of Mauritius, Kenya and Morocco, while futures prices of crude oil granger impact Nigeria’s and South Africa’s equity markets.
    Praca niniejsza skupia się na wpływie jaki mają kryzys wydobycia ropy naftowej, produkcji surowego oleju palmowego oraz niestabilność cen terminowych na rynki akcji krajów afrykańskich. Autorzy analizują dane za okres od stycznia 2000 do lipca 2013, które były publikowane przez agencję Bloomberg. Wykorzystują model wektorowej korekcji błędów (VEC). Wyniki analizy ekonometrycznej wskazują, że występuje pewien związek między tempem dostosowania się wśród rynków akcji takich krajów jak Mauritius, którego podstawą gospodarki jest turystyka, i który to rynek zareagował szybciej w porównaniu z rynkami akcji innych krajów. Wskaźnik rynku akcji w Kenii kształtował się dodatnio w porównaniu z tymi w Maroko i Nigerii, podczas gdy rynek akcji w Afryce Południowej reagował wolniej, nie tak jak inne rynki akcji. Skutki wynikające dla rynków akcji w Maroko i Nigerii, które przystosowywały się wolniej do kryzysu jaki wstrząsnął rynkiem ropy, wynikały z dużego uzależnienia finansowania działalności gospodarczej od dochodów pochodzących z wydobycia ropy naftowej, jakie przyjęły rządy obu tych krajów. Badanie pokazuje istnienie długookresowego wpływu jaki wywierają niestabilny rynek wydobycia ropy naftowej, rynek surowego oleju palmowego i cen terminowych na rynki akcji. Zastosowano test VECM przyczynowości Grangera w celu zbadania związku i wpływu między tymi zmiennymi. Wyniki wskazują, że kryzys na rynku ropy naftowej oraz ceny terminowe mierzone testem Grangera wpływają na rynek akcji krajów takich jak Mauritius, Kenia i Maroko, a terminowe ceny ropy naftowej mierzone testem Grangera wpływają na rynki akcji Nigerii oraz Afryki Południowej.
    Źródło:
    Economic and Environmental Studies; 2018, 18, 1; 31-46
    1642-2597
    2081-8319
    Pojawia się w:
    Economic and Environmental Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of radioactive impact of the gas well accident on environment of Sylhet division in Bangladesh
    Autorzy:
    Chakraborty, S. R.
    Saha, K. K.
    Rahman, A. K. M. R.
    Kamal, M.
    Chowdhury, M. I.
    Alam, Md. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411611.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Natural gas well accident
    Environmental radioactivity
    Public exposure etc
    Opis:
    The main goal of this study is to carry out the public exposure contribution from radioactive materials occurring due to the accident of natural gas exploration well of Sylhet division in Bangladesh. This study has been performed by using a gamma spectrometry of Genie 2000 software embedded PC-based High Purity Germanium (HPGe) detector system. The measured activity concentrations of naturally occurring radionuclides 232Th, 226Ra, and 40K have been in the public safety limit on the environment of the study areas. The specific activity of detected anthropogenic radionuclide 137Cs has been found to be very little with a mean value of 1.65 ± 0.61 and 1.13 ± 0.57 Bq•kg–1 in the Magurchhera and Haripur gas field area respectively.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 48-60
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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