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    Wyświetlanie 1-8 z 8
    Tytuł:
    New Middle Jurassic tangle-veined flies from Inner Mongolia, China
    Autorzy:
    Zhang, K
    Yang, D.
    Ren, D.
    Ge, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/20019.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Middle Jurassic
    nemestrinid fly
    morphology
    Nemestrinidae
    tangle veined fly
    fossil
    paleontology
    China
    Jurassic
    Ahirmoneura neimengguensis
    Inner Mongolia
    Opis:
    Many Jurassic fossil nemestrinid flies have been found in the Palaearctic region. China is an important locality for fossil nemestrinid flies. Up to now, 2 genera with 3 species have been discovered in China. In the present paper, a third genus and species, Ahirmoneura neimengguensis Zhang, Yang, and Ren, gen. et sp. nov., from the Middle Jurassic Daohugou Formation of China is described. A key to genera of fossil nemestrinid flies from China is given.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Bending, Impact Fracture Behavior and Characteristics of Stainless Steel Clad Plates with Different Rolling Temperature
    Autorzy:
    An, Q.
    Fan, K. Y.
    Ge, Y. F.
    Liu, B. X.
    He, J.
    Wang, S.
    Chen, C. X.
    Ji, P. G.
    Tolochko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049433.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stainless steel clad plate
    interface characteristics
    bending behavior
    impact morphologies
    delamination crack
    Opis:
    The interface characteristics, bending and impact behavior, as well as fracture characteristics of stainless steel clad plates fabricated by vacuum hot rolling at different rolling temperatures of 1100°C, 1200°C and 1300°C are investigated in detail. The interface bonding strength is gradually increased with the increasing rolling temperature due to the sufficient diffusion behavior of alloy element. The bending toughness and impact toughness are gradually decreased, while the bending strength increase with the increase of the rolling temperature, which is attributed to mechanisms of matrix softening and interface strengthening at high rolling temperature. Due to the weak interface at 1100°C, the bending and impact crack propagation path was displaced by delamination cracks, which in turn lead to reduction in stress intensity of the main crack, playing an effective role in toughening the stainless steel clad plates. Moreover, the impact fracture morphologies of clad plates show a typical ductile-brittle transition phenomenon, which is attributed to the matrix softening behavior with the increasing rolling temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 229-239
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    One cabin equipment location method based on the visibility human-factor potential field
    Metoda rozmieszczania przyrządów pokładowych oparta na pojęciach potencjałowego pola widoczności oraz potencjałowego pola czynnika ludzkiego
    Autorzy:
    Ge, Z.
    Wu, F.
    Yang, Y.
    Luo, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/301748.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    cabin equipment
    human-factor potential field (HFPF)
    visibility potential field(VPF)
    layout optimization
    particle swarm optimization (PSO)
    przyrządy pokładowe
    potencjałowe pole czynnika ludzkiego (HFPF)
    potencjałowe pole widoczności (VPF)
    optymalizacja rozmieszczenia
    optymalizacja rojem cząstek (PSO)
    Opis:
    The visibility is the basic condition for cabin equipment location. For the description of human, object and obstacle, the humanfactor potential field concept is proposed in this paper, concluding the visibility potential field, the reachability potential field. The cabin equipment layout problem is modeled based on the basic visibility potential field model. The optimal layout optimization method is studied based on the particle swarm optimization (PSO) algorithm by natural selection. Finally, the applicability of the proposed idea is illustrated by numerical studies.
    Widoczność jest podstawowym warunkiem przy projektowaniu rozmieszczenia przyrządów pokładowych. W przedstawionej pracy zaproponowano pojęcie potencjałowego pola czynnika ludzkiego (human-factor potential field, HFPF), które służy do opisu czynnika ludzkiego, przedmiotów oraz przeszkód. HFPF obejmuje pojęcia potencjałowego pola widoczności oraz potencjałowego pola dostępu. Problem umiejscowienia elementów wyposażenia kabiny zamodelowano na podstawie podstawowego modelu potencjałowego pola widoczności. Metodę optymalizacji rozmieszczenia elementów wyposażenia badano w oparciu o algorytm optymalizacji rojem cząstek (PSO), metodą naturalnej selekcji. Zastosowanie proponowanej koncepcji zilustrowano na przykładzie badań numerycznych.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 2; 236-242
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatio-temporal risk assessment models for Lobesia botrana in uncolonized winegrowing areas
    Autorzy:
    Heit, G.E.
    Sione, W.F.
    Acenolaza, P.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/65802.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The objective of this work was to generate a series of equations to describe the voltinism of Lobesia botrana in the quarantine area of the main winemaking area of Argentina, Mendoza. To do this we considered an average climate scenario and extrapolated these equations to other winegrowing areas at risk of being invaded. A grid of 4 km2 was used to generate statistics on L. botrana captures and the mean temperature accumulation for the pixel. Four sets of logistic regression were constructed using the percentage of accumulated trap catches/grid/week and the degree-day accumulation above 7°C, from 1st July. By means of a habitat model, an extrapolation of the phenological model generated to other Argentine winemaking areas was evaluated. According to our results, it can be expected that 50% of male adult emergence for the first flight occurs at 248.79 ± 4 degree-days (DD), in the second flight at 860.18 ± 4.1 DD, while in the third and the fourth flights, 1671.34 ± 5.8 DD and 2335.64 ± 4.3 DD, respectively. Subsequent climatic comparison determined that climatic conditions of uncolonized areas of Cuyo Region have a similar suitability index to the quarantine area used to adjust the phenological model. The upper valley of Río Negro and Neuquén are environmentally similar. Valleys of the northwestern region of Argentina showed lower average suitability index and greater variability among SI estimated by the algorithm considered. The combination of two models for the estimation of adult emergence time and potential distribution, can provide greater certainties in decision-making and risk assessment of invasive species.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of silicon and calcium application on growth, yield and fruit quality parameters of cucumber established in a sodic soil
    Autorzy:
    González-Terán, G.E.
    Gómez-Merino, F.C.
    Trejo-Téllez, L.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/12714269.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Soil salinity is a growing problem that affects crop quality. Cucumber is a vegetable eaten fresh, with great worldwide demand, making its chemical and physical characteristics important. In the present work, the effects of foliar application of silicon (Si: 0 and 2 mM), calcium (Ca: 0 and 2 mM), and the combination of both (Si + Ca: 0 + 0 mM, 2 + 0 mM, 0 + 2 mM and 2 + 2 mM) on dry matter of leaves and stems, yield and fruit quality of cucumbers grown in a sodic soil were studied. Treatments did not affect dry biomass, yield and product size. The obtained results show that applying foliar Ca increases total soluble solids in comparison to the control. Foliar Si application significantly increased fruit firmness in the end towards the peduncle. Moreover, foliar Ca application increased the fruit hue angle (intense green), while foliar Si application increased chroma (dark green), both significantly regarding the control. The individual applications of Si and Ca were proven to differentially improve the fruit quality parameters of cucumber in sodic soil conditions.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 3; 149-158
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy metal content in the African giant snail Archachatina marginata (Swainson, 1821) (Gastropoda: pulmonata: achatinidae) in Southern Nigeria
    Autorzy:
    Iwegbue, C.M.A.
    Arimoro, F.O.
    Nwajei, G.E.
    Eguavoen, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/83638.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Opis:
    Heavy metal concentrations in the African giant snail Archachatina marginata (Swainson) from nine localities in southern Nigeria ranged from 0.77 to 7.51 mg kg–1 Pb; 3.06–46.9 mg kg–1 Fe; 0.03–0.40 mg kg–1 Ni; 0.04–0.12 mg kg–1 Cu; 0.71–4.51 mg kg–1 Co; 0.67–1.27 mg kg–1 Mn; 0.99–3.28 mg kg–1 Cd; 0.08–0.22 mg kg–1 Zn; Cr was below the limit of detection. Concentrations of Pb, Fe, Ni, Cu, Co, Cd and Zn in the snail tissue varied significantly (95% confidence limit) between the localities. No significant variation was observed in the concentrations of Cr and Mn. Pb and Cd concentration exceeded the statutory safety limits for these elements in meat. The results indicate a heavy metal pollution of the habitats.
    Źródło:
    Folia Malacologica; 2008, 16, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable isotopic and mineralogical investigations of an arid Quaternary lacustrine palaeoenvironment, Western Qaidam, China
    Autorzy:
    Bojar, A. V.
    Rieser, A.
    Neubauer, F.
    Bojar, H. P.
    Genser, J.
    Liu, Y.
    Ge, X. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058952.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Qaidam
    Quaternary
    stable isotopes
    celestine
    carbonates
    hypersaline lacustrine environment
    Opis:
    Stable isotope analyses on carbonates from lake evaporites collected from the non-marine western Qaidam basin yield a positive excursion from Pliocene to Quaternary times. At Dafeng Shan, the Quaternary sequences are composed of alternating layers of celestine/dolomite and aragonite/calcite/barite with distinct isotopic compositions. The sequence described at Dafeng Shan formed in a low energy, hypersaline lacustrine environment as indicated by the microstructures and evaporitic minerals as well as by the absence of lithoclasts. The peloids, ooids and oncoids described are related to microbialactivities in saline lake. The oxygen isotopic composition of the carbonates vary between +34.4 and +39.8‰ (SMOW), representing the heaviest values measured until now. The δ18 O and the δ34 S isotopic composition of the celestine range between 20.1 to 22.3‰ (SMOW) and +19 to +22‰ (CDT) respectively, suggesting sulfur recycling via sulfide oxidation. The carbon isotopic compositions of the carbonates show a large negative excursion of up to -30‰. The microstructures, mineralogy and isotopic compositions as well as the geological context suggest oxidation of methane from a deep source.
    Źródło:
    Geological Quarterly; 2005, 49, 2; 173-184
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical constituents of water hyacinth (Eichhornia crassipes) methanol leaf extract and its effect on selected enzymes of Periplaneta americana
    Autorzy:
    Adeleke, G.E.
    Adedosu, O.T.
    Ehigie, L.
    Adegbola, P.I.
    Olaniyi, A.A.
    Agoola, T.O.
    Ehigie, A.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096284.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Eichhornia crassipes
    spectroscopy
    chromatography
    Periplaneta americana
    antioxidant enzymes
    esterases
    Opis:
    Eichhornia crassipes (water hyacinth) possesses several biological properties. Periplaneta americana (cockroach) is a household insect pest that can disseminate pathogens. The present study analyses the chemical constituents of water hyacinth leaf methanol extract and its in vitro effects on antioxidant and esterase enzymes in cockroaches. Water hyacinth methanol extract (WHME) was subjected to gas chromatography-flame ionization detection (GC-FID). Crude enzyme preparations were obtained from nymph and adult cockroaches. In vitro effects of different concentrations (10–80 μg/ml) of WHME on superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), acetylcholinesterase (AChE), and carboxylesterase (CE) in crude enzyme preparations were spectrophotometrically measured using cypermethrin (CYP) and chlorpyrifos (CPF) as reference insecticides. The GC-FID chromatogram of WHME showed the presence of gallic acid, para-hydroxybenzoic acid, eritosin, gentisic acid, catechin, protocatechuric acid, quercetin, and eugenol. The WHME and CPF reduced catalase in adults and SOD in nymphs, while CYP and CPF reduced SOD activity in the adults of P. americana. GST was significantly increased by WHME in both nymph and adult cockroaches. AChE was reduced by WHME, CYP, and CPF in nymphs, while CE was increased by WHME in nymphs and adults as compared to the control. In conclusion, our study indicates a high phenolic content in the water hyacinth leaf methanol extract, which increased the activities of the antioxidant enzymes AChE and CE in P. americana. The results also show that the efficacy and the mode by which the extracts could induce toxicity depend on the growth stage of the cockroach.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 323-336
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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