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    Wyświetlanie 1-9 z 9
    Tytuł:
    Comparative studies on the morphometry and physiology of European populations of the lagoon specialist Cerastoderma glaucum (Bivalvia)
    Autorzy:
    Tarnowska, K.
    Wolowicz, M.
    Chenuil, A.
    Feral, J.-P.
    Powiązania:
    https://bibliotekanauki.pl/articles/48074.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    ecophysiology
    Baltic Sea
    morphometry
    bivalve
    lagoon
    European population
    Cerastoderma glaucum
    physiological parameter
    seasonal change
    adaptation
    Mediterranean Sea
    cockle
    North Sea
    Bivalvia
    Opis:
    Seasonal changes in the morphometric and physiological parameters of the cockle Cerastoderma glaucum (Bivalvia) from the Baltic Sea (GD), the North Sea (LV), and the Mediterranean Sea (BL) were investigated. The cockles from GD were much smaller than those from other populations due to osmotic stress. The female to male ratios did not differ significantly from 1 : 1. The northern populations (GD, LV) had a monocyclic reproductive pattern, whereas the southern population (BL) seemed to reproduce throughout the year. Seasonal changes in the contents of biochemical components appeared to be correlated with changes in trophic conditions and the reproductive cycle. Protein content was the highest in spring for all the populations. The highest lipid contents and lowest carbohydrate contents were noted in GD and BL in spring, while no marked differences were noted among seasons in LV (probably because the data from both sexes were pooled). Respiration rates in GD were the highest among the populations, which could have been due to osmotic stress. High metabolic rates expressed by high respiration rates in GD and LV in spring and autumn could have resulted from gamete development (in spring) and phytoplankton blooms (in spring and autumn).
    Źródło:
    Oceanologia; 2009, 51, 3; 437-458
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Population parameters of Sitophilus granarius [L.] [Coleoptera: Curculionidae] on rice
    Autorzy:
    Szlendak, E
    Powiązania:
    https://bibliotekanauki.pl/articles/66470.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Curculionidae
    Sitophilus granarius
    Coleoptera
    population parameter
    granary weevil
    rice
    Opis:
    Population parameters of Sitophilus granarius (L.) were measured under various conditions of temperaturę and relative humidity. The range of five examined temperatures (15 to 35°C) had a remarkably stronger effect on all examined parameters than applied range of two relative humidities (75%; 85 or 95% ). The highest intrinsic rate of natural increase (rm) and the highest finite rate of increase (lambda) were recorded when temperatures of 25 and 30°C were used. The generation time (T) ranged from approximately 10 weeks at 30°C and 75 or 85% RH to approximately 22 weeks when 15°C was used. At 35°C there were no survivors of any immature stages of S. granarius regardless of relative humidity, so population parameters could not be counted. A brief narrative is presented on the potential of these environmental variables for control applications.
    Określono parametry populacyjne wołka zbożowego Sitophilus granarius hodowanego w kontrolowanych warunkach temperatury i wilgotności względnej powietrza. Zakres pięciu testowanych temperatur (od 15 do 35°C) miał silniejszy wpływ na testowane parametry niż zakres dwóch użytych w testach wartości wilgotności względnej powietrza (75%; 85 lub 95%). Najwyższe wartości wrodzonego tempa wzrostu populacji (rm) i tempa zwiększenia liczebności populacji (lambda) rejestrowano w testach, gdzie zastosowano temperaturę 25 i 30°C. Czas rozwoju pokolenia (T) wynosił: 10 tygodni przy temperaturze 30°C i 22 tygodnie w temperaturze 15°C. W temperaturze 35°C owady w ogóle nie rozwijały się.
    Źródło:
    Journal of Plant Protection Research; 2000, 40, 3-4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A semiclassical model for a laser field inside an optical cavity
    Autorzy:
    Priyashanka, K. M.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194053.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Semi classical theory
    cavity electric field
    population inversion
    pump parameter
    resonance frequency
    threshold population
    Opis:
    Treating the laser medium quantum mechanically and the laser electric field classically, a mathematical model was developed to study a laser field inside a single mode optical cavity by numerical and analytical techniques. The simulations for threshold population, population inversion and average population with electric field frequency for 500 kHz resonance frequency of the atom are presented. The gain coefficient and the pump parameter with the frequency of the cavity electric field for 1000 kHz resonance frequency of the atom were simulated. The threshold population is a minimum when the frequency of electric field is equal to the resonance frequency of the atom. The population inversion varies sinusoidal with time and the frequency of the electric field and is a maximum at the threshold frequency of the atom. The saturated laser intensity at steady state increases linearly with the pump parameter and for larger values of the pump parameter, a smaller time is needed to reach the saturation of the laser field.
    Źródło:
    World Scientific News; 2015, 13; 65-79
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of environmental factors on the diversity and abundance of malacofauna of water bodies of different stability: the floodplain of the Bug River
    Autorzy:
    Jurkiewicz-Karnkowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/83622.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    environmental factor
    diversity
    abundance
    malacofauna
    water body
    stability differentiation
    flood plain
    Bug River
    2007-2009 period
    mollusc
    bottom deposit
    macrophyte
    oxygen content
    species number
    population density
    water parameter
    chemical parameter
    Źródło:
    Folia Malacologica; 2012, 20, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The formation of transportation route selection model of the urban population in Matlab software environment
    Formirovanie modeli vybora marshruta peredvizhenija gorodskogo naselenija v programmnojj srede Matlab
    Autorzy:
    Fornalchyk, Y.
    Demchuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/793241.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    fuzzy logic
    calculation method
    implementation
    transportation
    urban population
    passenger
    allocation
    MATLAB software
    parameter model
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2015, 15, 3
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Population parameters as an andicator of susceptibility of ornamental coniferous plants to spruce spider mite
    Autorzy:
    Czajkowska, B.
    Kielkiewicz, M.
    Puchalska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/65565.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cypress
    Oligonychus ununguis
    conifer
    susceptibility
    resistance
    ornamental plant
    spruce
    population parameter
    spruce spider mite
    Źródło:
    Journal of Plant Protection Research; 2003, 43, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameter identification and estimation for stage-structured population models
    Autorzy:
    Coll, Carmen
    Sánchez, Elena
    Powiązania:
    https://bibliotekanauki.pl/articles/331082.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system identification
    parameter estimation
    dynamic population
    discrete time system
    rank-one matrix
    identyfikacja systemu
    estymacja parametru
    dynamika populacji
    system czasu dyskretnego
    Opis:
    A stage-structured population model with unknown parameters is considered. Our purpose is to study the identifiability of the model and to develop a parameter estimation procedure. First, we analyze whether the parameter vector can or cannot uniquely be determined with the knowledge of the input-output behavior of the model. Second, we analyze how the information in the experimental data is translated into the parameters of the model. Furthermore, we propose a process to improve the recursive values of the parameters when successive observation data are considered. The structure of the state matrix leads to an analysis of the inverse of a sum of rank-one matrices.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 2; 327-336
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accounting for Spatial Heterogeneity of Preferences in Discrete Choice Models
    Autorzy:
    Budziński, Wiktor
    Czajkowski, Mikołaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2075414.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    discrete choice experiment
    discrete choice models
    individual-, region- and population-level parameter estimates
    spatial preference heterogeneity
    Opis:
    There are reasons researchers may be interested in accounting for spatial heterogeneity of preferences, including avoiding model misspecification and the resulting bias, and deriving spatial maps of willingness-to-pay (WTP), which are relevant for policy-making and environmental management. We employ a Monte Carlo simulation of three econometric approaches to account for spatial preference heterogeneity in discrete choice models. The first is based on the analysis of individual-specific estimates of the mixed logit model. The second extends this model to explicitly account for spatial autocorrelation of random parameters, instead of simply conditioning individual-specific estimates on population-level distributions and individuals’ choices. The third is the geographically weighted multinomial logit model, which incorporates spatial dimensions using geographical weights to estimate location-specific choice models. We analyze the performance of these methods in recovering population-, region- and individual-level preference parameter estimates and implied WTP in the case of spatial preference heterogeneity. We find that, although ignoring spatial preference heterogeneity did not significantly bias population-level results of the simple mixed logit model, neither individual-specific estimates nor the geographically weighted multinomial logit model was able to reliably recover the true region- and individual-specific parameters. We show that the spatial mixed logit proposed in this study is promising and outline possibilities for future development.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2021, 1; 1-24
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic overload of silver fir (Abies alba Mill.) from five populations from central Bosnia and Herzegovina
    Autorzy:
    Ballian, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/38529.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    genetic overload
    silver fir
    Abies alba
    seed
    germination
    physiological parameter
    plant population
    Bosnia and Herzegovina
    Opis:
    The research was conducted with a view to establishing physiological parameters of the silver fir (Abies alba Mill.) with regard to germination energy, absolute germination and genetic overload produced by silver fir populations. The intention was to identify significant variability within populations and subpopulations, or rather within the two combined, and to give recommendations on the usage and usability of seeds from specific populations. The results form a basis for establishing silver fir genetic overload within five fir populations of central Bosnia and Herzegovina. The results of research on the characteristics such as absolute seed weight, germination energy and absolute germination are within a scope of previous studies. The studied physiological characteristics of silver fir seeds in the central Bosnia area showed distinct individual and inter-population variability when compared to variability of the subpopulations analyzed. The inclusion of non-physiological data (height, DBH, age and the presence of mistletoe) concerning sampled trees proved to be effective new quality of research. No correlation was found between DBH and seed physiological characteristics but increased tree height had a positive effect on seed quality in terms of absolute germination and growth, proportional to tree height. This in turn shows that seeds should be collected only from trees of above average height, because they are less genetically overloaded. The characteristics of healthy but ungerminated seeds from less tall trees displayed lower parameter values, also indicating that seeds should be collected from taller than average trees only. The presence of mistletoe had a very interesting effect of increasing rotten seeds percentage, and therefore reducing seed quality. Accordingly, seed collection should be limited to trees not affected by mistletoe, however further research on this aspect is required.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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