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Wyszukujesz frazę "Nowicki, Ł." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Kinetic analysis of thermogravimetric data collected from bigger samples
    Autorzy:
    Nowicki, L.
    Markowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185111.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    termograwimetria
    kinetyka
    redukcja tlenków metali
    thermogravimetry
    kinetics
    thermal lag
    cellulose pyrolysis
    metal oxide reduction
    Opis:
    Results for microcrystalline cellulose pyrolysis are presented, which includes thermogravimetric measurements and kinetic analysis of experimental data. The effect of sample mass size and heating rate on estimated values of activation energy and pre-exponential factor is demonstrated and a simple modification of procedure is proposed that allows for the correct values of kinetic parameters regardless of the experimental conditions. The efficiency of the proposed method is confirmed for two endothermic chemical reactions. A method of nonlinear regression is used for calculation of kinetic parameters for a single or TG curve or several curves simultaneously.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 85-94
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic characterisation of catalysts for methanol synthesis
    Autorzy:
    Ledakowicz, S.
    Nowicki, L.
    Petera, J.
    Nizioł, J.
    Kowalik, P.
    Gołębiowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185511.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    methanol synthesis
    copper base catalyst
    kinetics
    Zr and Mg doping
    synteza metanolu
    katalizator na bazie miedzi
    kinetyka
    Opis:
    The results of activity studies of four catalysts in methanol synthesis have been presented. A standard industrial catalyst TMC-3/1 was compared with two methanol catalysts promoted by the addition of magnesium and one promoted by zirconium. The kinetic analysis of the experimental results shows that the Cu/Zn/Al/Mg/1 catalyst was the least active. Although TMC-3/1 and Cu/Zn/Al/Mg/2 catalysts were characterised by a higher activity, the most active catalyst system was Cu/Zn/Al/Zr. The activity calculated for zirconium doped catalyst under operating conditions was approximately 30% higher that of TMC-3/1catalyst. The experimental data were used to identify the rate equations of two types – one purely empirical power rate equation and the other one - the Vanden Bussche & Froment kinetic model of methanol synthesis. The Cu/ZnO/Al2O3catalyst modified with zirconium has the highest application potential in methanol synthesis.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 4; 497-506
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological evidence of lack of contact with caprine herpesvirus type 1 and bluetongue virus in goat population in Poland
    Autorzy:
    Czopowicz, M.
    Kaba, J.
    Szalus-Jordanow, O.
    Nowicki, M.
    Witkowski, L.
    Frymus, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/30762.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    serological evidence
    caprine herpesvirus type 1
    bluetongue virus
    goat
    population
    Polska
    seroprevalence
    small ruminant
    animal infection
    Opis:
    Investigation into herd-level seroprevalence of caprine herpesvirus type 1 (CpHV-1) and bluetongue virus (BTV) was conducted in 2007 in Poland. It involved the entire population of goats covered by a milk recording program in 2007, which included 49 goat herds. The number of goats examined in each herd was determined statistically in order to detect the presence of at least one seropositive animal in a herd with a 95% probability and simple random method of sampling was applied. No antibodies to CpHV-1 or BTV were detected. Further calculations were carried out to determine the herd-level true seroprevalence, taking into account sensitivity and specificity of the test as well as several other factors. It can be concluded that till the middle of 2007 population of Polish goats covered by the milk recording program remained negative with respect to CpHV-1 and BTV.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariate model for the assessment of risk of fetal loss in goat herds
    Autorzy:
    Czopowicz, M.
    Kaba, J.
    Szalus-Jordanow, O.
    Nowicki, M.
    Witkowski, L.
    Frymus, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/30195.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multivariate analysis
    risk assessment
    risk
    fetal loss
    goat
    herd
    abortion
    logistic regression
    Opis:
    The observational study was carried out in a population of Polish breeding goats in 2007 to determine the prevalence of fetal loss and identify risk factors contributing to its occurrence. The multivariate model allowing to predict the risk of the occurrence of fetal loss in a herd in a study population was developed. Data on the occurrence of fetal loss, as well as of 28 hypothesized risk factors were collected from goat owners using standardized questionnaire during face-to-face reviews on farms. Moreover, data on the herd-level seroprevalence of four abortifacient infections – Chlamydophila abortus, Leptospira spp., BVDV-1 and Neospora caninum – were included in the final analysis. Fetal loss was reported as occurring often in 12 of 49 goat herds (24.5%). The relationship between the hypothesized risk factors and the occurrence of fetal loss was verified in the multivariate logistic regression (α=0.05). Final analysis yielded four risk factors: regular veterinary supervision at least twice a year (OR 0.188; CI 95% 0.054 – 0.656), frequent occurrence of injuries and fractures (OR 3.172; CI 95% 1.081 – 9.310), frequent occurrence of respiratory signs in adult goats (OR 4.848; CI 95% 1.353 – 17.377) and presence of antibodies to C. abortus in a herd (OR 58.116; CI 95% 1.369 – 2466.438). The accuracy of the multivariate model was analyzed using receiver operating characteristic (ROC) curve technique. Area under the curve was 0.895 (CI 95% 0.801-0.981). For optimal cut-off value of 0.20-0.35 the multivariate model had sensitivity of 75.00% and specificity of 89.19% in predicting fetal loss in a herd.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevalence of antibodies against Chlamydophila abortus and Coxiella burnetii in goat herds in Poland
    Autorzy:
    Czopowicz, M
    Kaba, J.
    Szalus-Jordanow, O.
    Nowicki, M.
    Witkowski, L.
    Nowicka, D.
    Frymus, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/32410.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antibody
    prevalence
    Chlamydophila abortus
    Coxiella burnetii
    goat
    herd
    abortion
    enzootic abortion
    Q fever
    reproductive failure
    Opis:
    An epidemiological study was carried out to determine the herd prevalence of Chlamydophila abortus and Coxiella burnetii antibodies in goats covered by a milk recording program in Poland. The survey took place in 2007 and 48 herds located in different parts of the country were involved. A representative sample from each herd was taken by a simple random sampling allowing to detect seropositivity of a herd on a 95% level of confidence. In total 918 goats were tested for specific antibodies against both germs with the use of enzyme-linked immunosorbent assays. In addition, history of reproductive failures was recorded in these herds. The survey revealed that the herd prevalence of C. abortus was 4.2% (2 herds) while no C. burnetii antibodies were found. Abortions were reported to be a problem in 80% of herds while repeating estrus was encountered in 46% of herds. Reproductive failure concerned two seropositive herds as well. Since the germ is present in the population, it has to be taken into consideration in diagnostic process. Nevertheless, the results of the present study indicate that C. abortus infection occurs infrequently in Polish goats. As no antibodies against C. burnetii were detected in the screened sample the risk of goat-to-human transmission of both bacteria in Poland seems to be very low.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 1; 175-179
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the risk factors influencing the spread of caseous lymphadenitis in goat herds
    Autorzy:
    Kaba, J.
    Nowicki, M.
    Frymus, T.
    Nowicka, D.
    Witkowski, L.
    Szalus-Jordanow, O.
    Czopowicz, M.
    Thrusfield, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/30670.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    risk factor
    spread
    caseous lymphadenitis
    goat
    herd
    Corynebacterium pseudotuberculosis
    epidemiology
    Opis:
    Epidemiological studies on caseous lymphadenitis were carried out in Poland in 1996 and 2002 among goat herds covered by a milk recording program. Between-herd seroprevalence was 13.2% in 1996 and increased to 62.5% in 2002. The average size of seropositive herds was statistically significantly higher than that of seronegative ones, however there was no statistically significant difference in the age between the herds. A statistically significant prevalence ratio (PR) was identified and relevant attributable risk for exposed animals (ARexp) was calculated for the following risk factors: presence of seropositive males in a herd (PR=8.350; ARexp=0.651), presence of superficial abscesses in animals (PR=6.142; ARexp=0.620), presence of respiratory signs (PR=2.900; ARexp=0.393), presence of animals in poor condition in a herd (PR=2.774; ARexp=0.390) and occurrence of reproductive failures in a herd (PR=1.798; ARexp=0.230). Purchase of animals from abroad, mastitis and husbandry conditions (housing system, grazing system, hygienic conditions) were not shown to be statistically significant risk factors.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 2
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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