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    Wyświetlanie 1-7 z 7
    Tytuł:
    Characterization of Phyllosticta hostae causing Phyllosticta leaf spot on spider lily in China
    Autorzy:
    Yi, R.H.
    Gan, L.J.
    Chen, J.
    Xu, X.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/66837.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Phyllosticta hostae
    leaf spot
    plant disease
    spider lily
    Hymenocallis littoralis
    tropical plant
    herb
    China
    Opis:
    Leaf spot disease on the spider lily [Hymenocallis littoralis (Jacq.) Salisb.] continues to cause serious problems in China. To confirm the pathogen, the pathogenicity of isolates from diseased leaves was tested according to Koch’s postulates. The isolates were tentatively identified using morphological characteristics and confirmation was done by phylogenetic analysis of the translation elongation factor 1-alpha gene (TEF1), the actin gene (ACT), and internal transcibed spacer (ITS) sequences using neighbor-joining (NJ), maximum parsimony (MP), and Bayesian inference (BI) methods. The pathogen was identified as Phyllosticta hostae. Molecular analysis indicated very little diversity in the TEF1, ACT, and ITS gene. This is the first report of P. hostae causing leaf spot disease on spider lily in China.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scale effect of cement mortar specimens subjected to high temperatures using uniaxial compressive and splitting tensile tests
    Autorzy:
    Xiong, L. X.
    Zhang, X. J.
    Xu, Z. Y.
    Geng, D. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/230921.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zaprawa cementowa
    temperatura wysoka
    ściskanie jednoosiowe
    rozciąganie przy rozłupywaniu
    efekt skali
    cement mortar
    high temperature
    uniaxial compression
    splitting tensile
    scale effect
    Opis:
    In this study, cubic and cylindrical cement mortar specimens were first subjected to high temperatures, then the cubic and cylindrical specimens were taken out and conducted with uniaxial compressive test and splitting tensile test, respectively. The effect of the length to side ratio on the uniaxial compressive properties and the effect of thickness-to-diameter ratio on the splitting tensile properties of cement mortar specimens after high temperature were studied. Test results show that: (1) With temperature increasing from 25 ºC (room temperature) to 400 ºC, the compressive strength and elastic modulus of cubic specimens with three kinds of side lengths decrease; the decreasing rates of compressive strength and elastic modulus of cubic specimen with side length of 70.7 mm is higher than those of cubic specimens with side length of 100 mm and 150 mm, and the strain at the peak stress of cubic specimens with three kinds of side lengths increase. (2) After the same temperature, the tensile strength of cylindrical specimen decreases with the thickness-to-diameter ratio increasing from 0.5 to 1.0. The decreasing rate of tensile strength of cylindrical specimen with thickness-to-diameter ratio is highest when the temperature is 25 ºC (room temperature), followed by that after the temperature of 200 ºC, and that after the temperature of 400 ºC is the lowest.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 139-155
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of vehicle sideslip angle via pseudo-multisensor information fusion method
    Autorzy:
    Chen, T.
    Chen, L.
    Cai, Y.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/220661.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vehicle state estimation
    sideslip angle
    recursive least squares
    multi-sensor information fusion
    pseudo-measurements
    Opis:
    This paper presents a novel sideslip angle estimator based on the pseudo-multi-sensor fusion method. The kinematics-based and dynamics-based sideslip angle estimators are designed for sideslip angle estimation. Also, considering the influence of ill-conditioned matrix and model uncertainty, a novel sideslip angle estimator is proposed based on the wheel speed coupling relationship using a modified recursive least squares algorithm. In order to integrate the advantages of above three sideslip angle estimators, drawing lessons from the multisensory information fusion technology, a novel thinking of sideslip angle estimator design is presented through information fusion of pseudo-multi-sensors. Simulations and experiments were carried out, and effectiveness of the proposed estimation method was verified.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 499-516
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of fault-tolerant performance of a segmented rotor SRM and a conventional SRM
    Autorzy:
    Sun, X.
    Xue, Z.
    Han, S.
    Chen, L.
    Xu, X.
    Yang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/200893.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault tolerance
    segmented rotor SRM
    phase failure
    finite element method
    dynamic performance
    rotor segmentowy SRM
    metoda elementów skończonych
    wydajność dynamiczna
    tolerancja błędu
    awaria jednej fazy
    Opis:
    Due to the separation of magnetic field, electrical isolation and thermal isolation, motor drives possess a high fault-tolerance characteristic. In this paper, comparative study of mutual inductance between the proposed segmented rotor switched reluctance motor (SSRM) and the conventional switched reluctance motor (SRM) is carried out first, illustrating that the proposed SSRM has less mutual inductance between phases than the conventional SRM. In addition, if winding faults or power converter faults lead to phase failure, a comparative analysis on fault-tolerant performance under phase failure condition between the proposed SSRM and the conventional SRM is simulated in detail using the finite element method (FEM). Simulation results reveal that dynamic performance of the proposed SSRM, including output torque and phase current, is better than that of the conventional SRM. That is, the capacity of operating with the fault under phase failure condition in the proposed SSRM is superior to that in the conventional SRM.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 3; 375-381
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of mechanical properties of recycled coarse aggregate concrete
    Badania właściwości mechanicznych betonu kruszywowego wtórnego wykonanego z użyciem kruszywa gruboziarnistego także pochodzenia wtórnego
    Autorzy:
    Deng, X. H.
    Lu, Z. L.
    Li, P.
    Xu, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/962346.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton
    kruszywo gruboziarniste
    kruszywo z recyklingu
    stosunek wodno-cementowy
    wskaźnik zamiany
    wytrzymałość na ściskanie
    wytrzymałość na rozciąganie
    rozłupywanie
    concrete
    coarse aggregate
    recycled aggregate
    water-cement ratio
    replacement rate
    compression strength
    tensile strength
    splitting
    Opis:
    Recycling construction and demolition waste not only reduces project costs; and saves natural resources, but also solves the environmental threat caused by construction waste disposal. In this paper, C25 waste road concrete is used as an experimental material, the uniaxial compression strength and tensile splitting strength of C25 RAC whose coarse aggregate replacement rate is 0%, 25%, 50%, 75%, and 100% are tested under the condition that the water-to-cement ratio is 0.47, 0.55 and 0.61. The results show: (1) the uniaxial compression strength and tensile splitting strength decrease with the increase of RAC; (2) for concrete with the same water-to-cement ratio, when the coarse aggregate replacement rate changes from 0% to 50%, the uniaxial compression strength and tensile splitting strength of RAC changes slightly. When the coarse aggregate replacement rate changes from 50% to 100%, the uniaxial compression strength and tensile splitting strength of RAC decreases rapidly.
    Recykling odpadów budowlanych oraz materiałów pochodzących z rozbiórek nie tylko zmniejsza koszty projektu i oszczędza zasoby naturalne, ale również zażegnuje zagrożenie dla środowiska spowodowane przez składowanie odpadów budowlanych. Szczególnie w odniesieniu do właściwości mechanicznych betonu z kruszywa gruboziarnistego poddanego recyklingowi, odpady betonu drogowego C25 są używane jako materiał eksperymentalny, pod warunkiem że stosunek wody do cementu wynosi 0,47, 0,55 i 0,61 oraz są przygotowane próbki betonu o wskaźniku zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi wynoszącym 25%, 50%, 75% i 100% betonu z naturalnego kruszywa gruboziarnistego. Próbka to sześcian o wymiarach 150 × 150 × 150 mm. Przygotowaliśmy 6 próbek dla każdego wskaźnika zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi. Przygotowano łącznie 90 próbek betonu. Próbki zostały usunięte 24 godziny po ustawieniu oraz były utwardzane w temperaturze 20°C i wilgotności 90% przez 28 dni. Następnie przeprowadzono próby ściskania jednoosiowego oraz wytrzymałości na rozciąganie przez rozłupywanie betonu z kruszywa poddawanego recyklingowi C25.
    Źródło:
    Archives of Civil Engineering; 2016, 62, 4/II; 19-34
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of different sources of donor cells upon the nuclear transfer efficiency in Chinese indigenous Meishan pig
    Autorzy:
    Hua, Z.
    Xu, G.
    Liu, X.
    Bi, Y.
    Xiao, H.
    Hua, W.
    Li, L.
    Zhang, L.
    Ren, H.
    Zheng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/31224.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Somatic cell nuclear transfer (SCNT) is currently the most efficient and precise method to generate genetically tailored pig models for both agricultural and biomedical research. However, its efficiency is crucially dependent on the source of nuclear donor cells. In this study, we compared the cloning efficiency by using three lines of donor cells that are derived from fetal, newborn and adult fibroblasts of Chinese indigenous Meishan pig. We showed that cleavage rate and blastocyst formation rate of the reconstructed embryos were not significantly different between the fetal (80.7% and 15.6%) and newborn ear skin (77.5% and 12.3%) fibroblast groups (p>0.05), but in both groups these indices were significantly higher than that found in the adult ear skin (70.5% and 8.8%; p<0.05). Reconstructed embryos derived from fetal, newborn, and adult ear skin fibroblasts were transferred to four surrogates, respectively. For the fetal, newborn, and adult ear skin fibroblasts, the number of pregnancies were two (50.0%), two (50.0%), and one (25.0%), respectively, and the number of deliveries were two (50.0%), one (25.0%), and zero (0.0%), respectively. Seven and two cloned piglets were obtained from the fetal and newborn ear skin fibroblasts respectively, while no piglets were obtained from the adult ear skin fibroblasts. Two cloned piglets from the newborn ear skin fibroblasts died shortly after birth because of neonatal asphyxia caused by dystocia. The birth weights of the piglets derived from the fetal and newborn ear skin fibroblasts were 1230.5 and 1310.0g, respectively, which were statistically insignificant (p>0.05), but both were significantly higher than that of the control groups (p<0.05). Microsatellite analyses demonstrated that the genotypes of all cloned piglets were identical to their donor cells. Therefore, cloned pigs were successfully produced using two sources of donor cells isolated from the fetal and newborn ear skin fibroblasts of Meishan piglet, and indicating a better cloning efficiency than that obtained from adult fibroblasts. We concluded that the nuclear donor cell lines have significant impact on the developmental competence of cloned embryos as well as on the cloning efficiency of Meishan pig.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring
    Autorzy:
    Zhang, J.
    Li, Y.
    Xu, E.
    Jiang, L.
    Tang, J.
    Li, M.
    Zhao, X.
    Chen, G.
    Zhu, H.
    Yu, X.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087465.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bacterial communities
    broilers
    high-throughput sequencing
    particulate matter
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 495-504
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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