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    Wyświetlanie 1-8 z 8
    Tytuł:
    Magneto-elastic combined multidimensional resonance of a rotating circular plate in a double-direction magnetic field
    Autorzy:
    Li, Zhe
    Hu, Yu Da
    Li, Wen Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/281123.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    magneto-elastic
    annular plate
    multi-dimensional vibration
    combination resonance
    the method of multiple scales
    Opis:
    Magneto-elastic nonlinear non-axisymmetric resonance is investigated for a rotating annular plate in a double-direction magnetic field. According to transverse and longitudinal magneto- -elastic non-axisymmetric vibration equations of the thin annular plate, and considering the influence of the static load term, non-axisymmetric vibration differential equations by combined parametric and forced excitations are obtained through application of the Galerkin method. Then, the method of multiple scales is applied to solve differential vibration equations. By numerical computations, the influence of magnetic induction intensity, inner and outer diameters, excitation and radial forces on transverse and longitudinal resonance characteristics are analyzed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 883-895
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A dynamic model for the heat transfer behavior of a cooling system
    Autorzy:
    Liu, Wen
    Zhang, Chi
    Hu, Xiao-Xiong
    Cao, Jian-Bo
    Liu, Li-Jiao
    Ye, Xin-Y
    Lin, Li
    Qi, Xun-Ji
    Powiązania:
    https://bibliotekanauki.pl/articles/2050060.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    adsorption system
    refrigerating system
    desorption
    simulation
    Opis:
    For purposes of studying the heat transfer behavior of various fluids in a refrigeration system, a dynamic model is established, obtained on the basis of analysis concerning the effects of adsorption velocity, adsorbent bed temperature, condensing temperature, and heat transfer fluids, as well as changes of external conditions. It is demonstrated that adsorption velocity increases sharply in the initial phase of adsorption process and gradually declines after reaching a peak value, whereas condensing temperature increases sharply in the initial phase of desorption process and decreases after reaching a peak value with the desorption quantity decreasing. Furthermore, the increase of heat source temperature and the decrease of cooling water temperature can advance the adsorption process. The present study therefore suggests some ways of improving the performance of such a refrigeration system by increasing heat source temperature, decreasing ambient air temperature, increasing return air temperature and decreasing cooling water temperature.
    Źródło:
    Control and Cybernetics; 2020, 49, 3; 315--332
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of PP Fabric with Polyols by the Plasma Composite Technique
    Autorzy:
    Ma, Wen-Xiao
    Hu, Bing-Nan
    Bai, Yun
    Powiązania:
    https://bibliotekanauki.pl/articles/2171960.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    polypropylene fabric
    polyols
    crosslinker
    antistatic properties
    hydrophilicity
    Opis:
    In order to endow polypropylene (PP) fabric with hydrophilic and antistatic properties, PP was grafted with polyols (sorbitol, maltitol and polyethylene glycol (PEG)) by the oxygen plasma treatment and subsequent bridging process, where ethylene glycol diglycidyl ether (EGDE) and trimethylolpropanetris (2-methyl-1-aziridinepropionate) (TTMA) were used as crosslinkers. The highest grafting rate was 7.48%. The chemical structure changes were analysed by Fourier transform infrared spectroscopy (FTIR). A scanning electron microscope (SEM) was used to observe the changes in polypropylene fiber surface morphology. The hydrophilicity was characterized by testing loose fiber suspension and moisture retention. The modified PP was more easily immersed in water and the desorption behaviour continued for 2h without equilibrium. The half-life of the grafted PP was reduced to 7s. The results showed that the modified PP with polyols possessed hydrophilicity and antistatic properties.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 2 (151); 90--98
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polyamine plays a role in subculture growth of in vitro callus of indica rice
    Autorzy:
    Tan, Yanping
    Hu, Wen
    Xu, Xin
    Zhou, Jie
    Wang, Chuntai
    Liu, Xuequn
    Cheng, Gang
    Powiązania:
    https://bibliotekanauki.pl/articles/952026.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    browning
    callus
    gene expression
    indica rice
    polyamine
    Opis:
    In vitro embryogenic callus is a critical factor for genetic transformation of rice, especially for indica varieties. In this study, we investigated the relationship between polyamines, including putrescine (Put), spermidine (Spd) and spermine (Spm), and callus browning, and we studied the effect of exogenous Put on callus regeneration and on the content of endogenous polyamines. In addition, the expression levels of arginine decarboxylase gene (Adc1) and S-adenosylmethionine decarboxylase gene (Samdc) in embryogenic callus were studied by quantitative Real-time PCR analysis. The results showed that the contents of endogenous Put and Spd in the browning callus were significantly lower than those in normal callus. Exogenous Put could effectively improve the growing state of callus of indica rice and enhance the development of embryogenic callus. The content of endogenous polyamines in embryogenic callus, especially Spd and Spm, was increased after addition of exogenous Put. Additionally, exogenous Put also had an obvious impact on the expression levels of Adc1 but partial effect on the expression levels of Samdc gene. This study could increase the knowledge of both embryogenic callus induction and polyamine catabolism in callus in indica rice.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2017, 59, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Laplace Transform to the free vibration of continuous beams
    Zastosowanie przekształcenia Laplace’a w wolnych drganiach ciągłych wiązek
    Autorzy:
    Wen, H. B.
    Zeng, T.
    Hu, G. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/962342.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przekształcenie Laplace’a
    belka ciągła
    drganie swobodne
    metoda łączenia dzielona
    częstotliwość
    Laplace transform
    continuous beam
    free vibration
    segmented combination method
    frequency
    Opis:
    Laplace Transform is often used in solving the free vibration problems of structural beams. In existing research, there are two types of simplified models of continuous beam placement. The first is to regard the continuous beam as a single-span beam, the middle bearing of which is replaced by the bearing reaction force; the second is to divide the continuous beam into several simply supported beams, with the bending moment of the continuous beam at the middle bearing considered as the external force. Research shows that the second simplified model is incorrect, and the frequency equation derived from the first simplified model contains multiple expressions which might not be equivalent to each other. This paper specifies the application method of Laplace Transform in solving the free vibration problems of continuous beams, having great significance in the proper use of the transform method.
    Struktury ciągłej wiązki są bardzo często spotykane w projektach budowlanych. Przykłady obejmują: mostki ciągłej wiązki, stopy budynków, rury do wymiany ciepła w wymiennikach ciepła oraz wrzeciona obrabiarki. Nieodłączną częścią projektowania struktur ciągłych wiązek jest dynamiczna charakterystyczna analiza konstrukcji jako podstawy projektu antywibracyjnego. W celu uzyskania dynamicznych charakterystycznych parametrów struktur ciągłych wiązek, uczeni z kraju i z zagranicy przyjęli w celu poszukiwania rozwiązań liczne metody, w tym metodę elementów skończonych, metodę sztywności dynamicznej oraz metodę transferu matrycy. Metoda analityczna, w której wykorzystywane jest przekształcenie Laplace’a, mająca na celu rozwiązanie problemu wolnych drgań ciągłych wiązek, jest preferowana przez wielu badaczy i szeroko stosowana do rozwiązywania takich problemów w wielu dziedzinach. Niemniej jednak, istnieją pewne błędy w stosowaniu przekształcenia Laplace’a. W związku z tym, w niniejszej pracy przeprowadzono badania i analizę dotyczące różnych metod stosowania przekształcenia Laplace’a. Ponadto, w niniejszym dokumencie wyjaśniono metodę prawidłowego zastosowania przekształcenia Laplace’a podczas rozwiązywania problemu wolnego drgania ciągłej wiązki.
    Źródło:
    Archives of Civil Engineering; 2017, 63, 1; 163-180
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new basal actinopterygian fish from the Anisian (Middle Triassic) of Luoping, Yunnan Province, Southwest China
    Autorzy:
    Wen, W.
    Zhang, Q.-Y.
    Hu, S.-X.
    Zhou, C.-Y.
    Xie, T.
    Huang, J.-Y.
    Chen, Z.Q.
    Benton, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/21811.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    actinopterygian fish
    fish
    Anisian
    Middle Triassic
    Luoping
    Yunnan Province
    China
    Actinopterygii
    Halecomorphi
    Triassic
    Opis:
    The new neopterygian fish taxon Luoxiongichthys hyperdorsalis gen. et sp. nov. is established on the basis of five specimens from the second member of the Guanling Formation (Anisian, Middle Triassic) from Daaozi Quarry, Luoping, Yunnan Province, Southwest China. The new taxon is characterized by the following characters: triangular body outline with a distinct apex located between skull and dorsal fin; free maxilla; slender preopercular almost vertical; three suborbitals; at least eight strong branchiostegals with tubercles and comb−like ornamentation on the anterior margin; clavicles present; two postcleithra; ganoid scales covered by tubercles and pectinate ornamentation on the posterior margin with peg−and−socket structure; hemiheterocercal tail slightly forked. Comparison with basal actinopterygians reveals that the new taxon has parasemionotid−like triangular symplectics, but a semionotid opercular system. Cladistic analysis suggests that this new genus is a holostean, and either a basal halecomorph or basal semionotiform.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coelacanths from the Middle Triassic Luoping Biota, Yunnan, South China, with the earliest evidence of ovoviviparity
    Autorzy:
    Wen, W.
    Zhang, Q.-Y.
    Hu, S.-X.
    Benton, M.J.
    Zhou, C.-Y.
    Tao, X.
    Huang, J.-Y.
    Chen, Z.-Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/23008.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    coelacanth
    Middle Triassic
    Triassic
    Yunnan province
    South China
    China
    evidence
    ovoviviparity
    Anisian
    Actinistia
    Coelacanthoidei
    Latimerioidei
    Opis:
    The fossil record of coelacanths is patchy, with very few taxa known from the Triassic of Asia. We report here two new genera and species of coelacanths from the Luoping Biota, a recently found site of exceptional fossil preservation from Yunnan, South China. The first new taxon, Luopingcoelacanthus eurylacrimalis, is based on four specimens, which to− gether show most aspects of the anatomy. One specimen shows two small coelacanths inside the ventral portion of the ab− dominal cavity, and these are interpreted as intrauterine embryos, close to birth size, based on comparisons with previ− ously reported embryos of the fossil coelacanths Rhabdoderma and Undina, and the extant genus Latimeria. Our new find extends the evidence for ovoviviparity in coelacanths back from the Late Jurassic to the Middle Triassic. The second new taxon, Yunnancoelacanthus acrotuberculatus, is based on one specimen, and differs from Luopingcoelacanthus in the dentary, lachrymojugal, number of rays of the first dorsal fin, and especially in the ornament on dermal bones and scales. Acladistic analysis shows that the new taxa are closest relatives to the derived clade Latimerioidei. The relatively high di− versity of coelacanths in the Early Triassic, and adaptations of living Latimeria to low−oxygen conditions, suggests that the group may have included ‘disaster taxa’ that benefited from anoxic and dysoxic ocean conditions in the aftermath of the end−Permian mass extinction.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical analytical solution of deformation and stress distribution of underground gas storage cavern in bedded salt rock
    Autorzy:
    Xie, P.
    Wen, H. J.
    Wang, G. J.
    Hu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/230968.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    złoża soli kamiennej
    analiza teoretyczna
    funkcja wypierania Love'a
    zasada zgodności sprężysto-lepkosprężystej
    różnica skończona trójwymiarowa wyraźna
    bedded salt rock
    theoretical analysis
    Love displacement function
    elastic-viscoelastic correspondence principle
    three-dimensional explicit finite-difference
    Opis:
    The main purpose of the study is to investigate the mechanical properties around an underground gas storage cavern in bedded salt rock. Firstly, considering the characteristics of the salt rock formation in China, the mechanical model was simplified into a hollow cylinder, which containing non-salt interlayer. In terms of elastic theory, Love displacement function was developed, and the elastic general solution of stress and deformation components were obtained after determining the undetermined coefficients. Under the same condition, numerical simulation was carried out. The validity of the elastic general solution is verified by comparing to numerical simulation results. Furthermore, Based on the feasible general elastic solution, viscoelastic solution was obtained through Laplace transformation and inverse Laplace transform, which could provide reference for the study on the stability and tightness of underground gas storage carven during operation to some extent.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 37-53
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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