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    Wyświetlanie 1-4 z 4
    Tytuł:
    Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils
    Autorzy:
    Rani, S.
    Sud, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/25458.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    organophosphate pesticide
    dimethoate
    pesticide
    time
    temperature
    sorption
    isotherm
    kinetics
    thermodynamics
    soil
    soil contamination
    Opis:
    Experiments were conducted to study the sorption behaviour of dimethoate in three Indian soils at different temperatures. A kinetic study showed that adsorption equilibrium was reached within 15 h at different initial levels of pesticide concentration. Applicability of the pseudo second order kinetic model suggested that the adsorption process was complex and several mechanisms were involved. The Freundlich model explained the adsorption behaviour adequately and the isotherms were of S-type. The adsorption process was found to be strongly affected by temperature. The Gibbs free energy change, ΔGº values (from -15.81 to -16.60 kJ mol-1) indicated that the process was spontaneous and exothermic in nature. The change in enthalpy of adsorption, ΔH° values (from -17.729 to -21.539 kJ mol-1) suggested that relatively weak H-bond forces were the main driving forces for adsorption. Desorption was found to be concentration- and temperature-depen- dent with higher desorption occurring at higher temperature and concentration levels. The results signify the importance of temperature in controlling the mobility of dimethoate in water bodies.
    Źródło:
    International Agrophysics; 2014, 28, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Dynamics in Chlorine Compounds Using X-Ray Thermal Parameters and Nuclear Quadrupole Resonance Data
    Autorzy:
    Ramu, L.
    Banu, R.
    Rani, S.
    Chandramani, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046846.pdf
    Data publikacji:
    2006-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Gv
    Opis:
    Molecular dynamics (torsional frequencies) in several chlorine compounds were evaluated on the basis of X-ray thermal parameter data and nuclear quadrupole resonance data using Bayer's and Brown's approximation. It was found that the values obtained in both cases are in good agreement. The above approach is a good illustration of the supplementary nature of the data from X-ray studies in relation to nuclear quadrupole resonance studies of compounds in solid state.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 6; 775-779
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GA based optimal planning of VAR sources using Fast Voltage Stability Index method
    Autorzy:
    Bhattacharyya, B.
    Rani, S.
    Vais, I. R.
    Bharti, P. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/140784.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active power loss
    FVSI method
    genetic algorithm
    operating cost
    reactive power planning
    weak nodes
    Opis:
    This paper presents a novel approach for reactive power planning of a connected power network. Reactive power planning is nothing but the optimal usage of all reactive power sources i.e., transformer tap setting arrangements, reactive generations of generators and shunt VAR compensators installed at weak nodes. Shunt VAR compensator placement positions are determined by a FVSI (Fast Voltage Stability Index) method. Optimal setting of all reactive power reserves are determined by a GA (genetic algorithm) based optimization method. The effectiveness of the detection of the weak nodes by the FVSI method is validated by comparing the result with two other wellknown methods of weak node detection like Modal analysis and the L-index method. Finally, FVSI based allocation of VAR sources emerges as the most suitable method for reactive power planning.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 4; 789-802
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meiotic studies in some members of Caryophyllaceae Juss. from the Western Himalayas
    Autorzy:
    Jeelani, S.M.
    Rani, S.
    Kumar, S.
    Kumari, S.
    Gupta, R.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/19318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Caryophyllaceae
    Himalayas
    meiotic process
    chromosome number
    meiosis
    Western Himalayas
    pollen grain size
    Arenaria kashmirica
    Silene conoidea
    Silene edgeworthii
    Silene moorcroftiana
    Silene nepalensis
    Stellaria media
    Stellaria monosperma
    Stellaria semivestita
    Lychnis coronaria
    Silene vulgaris
    India
    Gypsophilla ceratioides
    Opis:
    The paper reports meiotic studies on 50 populations comprising 12 species belonging to 5 genera of Caryophyllaceae from the Western Himalayas. The chromosome numbers in Arenaria kashmirica (n=20), Silene conoidea (n=20), S. edgeworthii (n=12 and n=24), S. moorcroftiana (n=24), S. nepalensis (n=12), Stellaria media (n=13), S. monosperma (n=13) and S. semivestita (n=13) are reported for the first time. The chromosome numbers in Lychnis coronaria (n=12) and Silene vulgaris (n=24) are given for the first time from India, along with Gypsophilla ceratioides (n=15) from the Western Himalayas. The course of meiosis varies from normal to abnormal in different populations of Silene conoidea, S. edgeworthii, S. vulgaris, Stellaria media, S. monosperma and S. semivestita. The course of meiosis was abnormal in all studied populations of Lychnis coronaria. Abnormal microsporogenesis (cytomixis, chromosomal stickiness, unoriented bivalents, formation of laggards and bridges) led to reduced pollen fertility and differences in pollen grain size.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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