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    Wyświetlanie 1-7 z 7
    Tytuł:
    Performance degradation comparisons and failure mechanism of silver metal oxide contact materials in relays application by simulation
    Porównanie obniżenia charakterystyk oraz badanie mechanizmu uszkodzeń materiałów stykowych z kompozytów typu srebro-tlenek metalu stosowanych w przekaźnikach elektromagnetycznych na podstawie danych z symulacji komputerowej
    Autorzy:
    Wang, ZhaoBin
    Li, WeiYan
    Shang, Shang
    Wang, Zhan
    Han, ChunYang
    Powiązania:
    https://bibliotekanauki.pl/articles/301133.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    electrical contact performance
    contact material
    degradation parameter
    contact resistances
    failure mechanism
    wydajność styku elektrycznego
    materiał stykowy
    parametr degradacji
    rezystancja zestykowa
    mechanizm uszkodzenia
    Opis:
    To evaluate the electrical contact behaviors of silver metal oxide contact materials in relays application more accurately, and to guide the selection of contact materials, the test device and testing method for simulating electrical contact performance in relays application were analyzed in this paper. The electrical contact simulation test system was designed and developed, which can easily simulate contact materials. The contact resistance, static force and rebound energy degradation parameters of AgSnO2, AgCdO and AgNi contact materials under the same load conditions were obtained through experimental research, the contact resistance and arcing energy degradation parameters of AgSnO2 under different opening distances were acquired at the same time. The result indicated that accurate data are received by the electrical contact simulation testing method. Finally, based on the test data, the degradation performance of three selected test materials was tested, and the failure mechanism of AgSnO2 materials was analyzed.
    W celu dokładniejszej oceny zachowania styków elektrycznych z kompozytów srebra i tlenku metalu stosowanych w przekaźnikach elektromagnetycznych oraz w celu ułatwienia wyboru materiałów stykowych, w niniejszej pracy przeanalizowano urządzenie testowe oraz metodę testowania, które pozwalają na symulację działania styku przekaźnika. Zaprojektowano i zbudowano system testowania styków elektrycznych, który umożliwia łatwą symulację zachowania materiałów stykowych. Parametry degradacji rezystancji zestykowej, siły statycznej oraz energii odbicia materiałów stykowych AgSnO2, AgCdO i AgNi uzyskano w badaniach eksperymentalnych prowadzonych w takich samych warunkach obciążenia. Jednocześnie badano także parametry degradacji rezystancji zestykowej energii łuku AgSnO2 przy różnych odległościach otwarcia styków. Wyniki pokazują, że proponowana metoda badania symulacyjnego styków elektrycznych pozwala na uzyskanie dokładnych danych. W oparciu o dane testowe, przebadano zachowanie degradacyjne trzech wybranych materiałów oraz przeanalizowano mechanizm uszkodzenia styków z kompozytu AgSnO2.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 1; 86-93
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of the Atomic Structure for Fe XVII Lines
    Autorzy:
    Zhou, Chao
    Cao, Jian-Jian
    Liang, Liang
    Yu, Geng-Hua
    Wang, Zhan-Min
    He, Hua-Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/1398915.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.70.Cs
    34.80.Dp
    Opis:
    Energy levels, line strengths, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for sixteen-times ionized iron (Fe XVII). The atomic data are calculated with the AUTOSTRUCTURE code, where relativistic corrections are introduced according to the Breit-Pauli distorted wave approach. The calculations of atomic data for 89 fine-structure levels generated from eleven configurations 2s²2p⁶, 2s²2p⁵ (3s, 3p, 3d), 2s²2p⁵ (4s, 4p, 4d, 4f) and 2s¹2p⁶ (3s, 3p, 3d) of the Ne-like Fe ion are presented. Fine structure collision strengths for transitions from the ground and the first four excited levels are presented at four electron energies: 75, 125, 175, and 250 Ry. These atomic structure data are compared with the available experimental and theoretical results.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1109-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A random forest model for the prediction of spudcan penetration resistance in stiff-over-soft clays
    Autorzy:
    Gao, Pan
    Liu, Zhihui
    Zeng, Ji
    Zhan, Yiting
    Wang, Fei
    Powiązania:
    https://bibliotekanauki.pl/articles/1573798.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    machine learning
    random forest
    jack-up
    penetration resistance
    stiff-over-soft clays
    Opis:
    Punch-through is a major threat to the jack-up unit, especially at well sites with layered stiff-over-soft clays. A model is proposed to predict the spudcan penetration resistance in stiff-over-soft clays, based on the random forest (RF) method. The RF model was trained and tested with numerical simulation results obtained through the Finite Element model, implemented with the Coupled Eulerian Lagrangian (CEL) approach. With the proposed CEL model, the effects of the stiff layer thickness, undrained shear strength ratio, and the undrained shear strength of the soft layer on the bearing characteristics, as well as the soil failure mechanism, were numerically studied. A simplified resistance profile model of penetration in stiff-over-soft clays is proposed, divided into three sections by the peak point and the transition point. The importance of soil parameters to the penetration resistance was analysed. Then, the trained RF model was tested against the test set, showing a good prediction of the numerical cases. Finally, the trained RF was validated against centrifuge tests. The RF model successfully captured the punch-through potential, and was verified using data recorded in the field, showing advantages over the SNAME guideline. It is supposed that the trained RF model should give a good prediction of the spudcan penetration resistance profile, especially if trained with more field data.
    Źródło:
    Polish Maritime Research; 2020, 4; 130-138
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the EV charging load estimation and mode optimization methods
    Autorzy:
    Zhan, Zhiyan
    Dong, Kailang
    Pang, Xiaochen
    Zhao, Hongfei
    Wang, Aifang
    Powiązania:
    https://bibliotekanauki.pl/articles/141614.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EVs
    gap optimization
    Latin hypercube sampling
    Monte Carlo simulatino
    Opis:
    With the increasing number of electric vehicles (EVs), the disordered charging of a large number of EVs will have a large influence on the power grid. The problems of charging and discharging optimization management for EVs are studied in this paper. The distribution of characteristic quantities of charging behaviour such as the starting time and charging duration are analysed. The results show that charging distribution is in line with a logarithmic normal distribution. An EV charging behaviour model is established, and error calibration is carried out. The result shows that the error is within its permitted scope. The daily EV charge load is obtained by using the Latin hypercube Monte Carlo statistical method. Genetic particle swarm optimization (PSO) is proposed to optimize the proportion of AC 1, AC 2 and DC charging equipment, and the optimal solution can not only meet the needs of users but also reduce equipment investment and the EV peak valley difference, so the effectiveness of the method is verified.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 831-842
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical study on the changes of stress in temporomandibular joints after the orthognathic surgery in patients with mandibular prognathism: a 3D finite element study
    Autorzy:
    Shu, Jingheng
    Wang, Quanyi
    Ma, Hedi
    Teng, Haidong
    Zheng, Tinghui
    Liu, Zhan
    Powiązania:
    https://bibliotekanauki.pl/articles/27324150.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    temporomandibular joint
    finite element method
    mandibular prognathism
    temporomandibular disorders
    staw skroniowo-żuchwowy
    metoda elementów skończonych
    prognatyzm żuchwy
    zaburzenia skroniowo-żuchwowe
    Opis:
    Purpose: This study aimed to analyze the changes of the stress distributions in TMJs for the pre- and postoperative patients with mandibular prognathism under unilateral occlusions, a frequent occlusion in mastication. Methods: Pre- and six-mouth postoperative cone-beam computed tomography images of thirteen patients diagnosed with mandibular prognathism were scanned and used to construct complete maxillofacial models, assigned as the Pre and Post group, respectively. Another ten asymptomatic individuals were defined as the Control group. The inhomogeneous properties were assigned to the models. The muscle forces and boundary conditions corresponding to left and right unilateral occlusions were applied on the models. The analysis of variation (ANOVA) was chosen for the comparison among the groups. Results: The results showed that the Pre group had abnormal stress distributions ang higher stress level in TMJs, compared with those of the Post and Control groups. Moreover, from clinical cases, symptoms of temporomandibular disorders (TMDs) always followed with increased stresses. Conclusion: Generally, orthognathic surgeries could improve the stress distribution in TMJs of the patients with mandibular prognathism under the unilateral occlusions. However, the postoperative complications, especially symptoms of TMD, were closely related to changes of stress for patients with mandibular prognathism after orthognathic surgeries. Individual virtual surgery and finite element analysis should be conducted to prevent complications in TMJ.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 2; 155--163
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seroprevalence of antibodies to classical swine fever virus and porcine reproductive and respiratory syndrome virus in healthy pigs in Hunan Province, China
    Autorzy:
    Yu, H.
    Zhang, L.
    Cai, Y.
    Hao, Z.
    Luo, Z.
    Peng, T.
    Liu, L.
    Wang, N.
    Wang, G.
    Deng, Z.
    Zhan, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539345.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    classical swine fever virus (CSFV)
    porcine reproductive and respiratory syndrome virus (PRRSV)
    pig
    seroprevalence
    antibody
    Opis:
    Classical swine fever (CSF) and porcine reproductive and respiratory syndrome (PRRS) are responsible for major economic losses and represent a threat to the swine industry worldwide. Routine surveillance serology for CSF and PRRS viruses is critical to maintaining the health status of sow farms in Hunan Province, which is one of the top pig production provinces in China. The aim of our study was to investigate the serological statistics of CSF virus (CSFV) and PRRS virus (PRRSV) in Hunan Province. The cohort serum samples were collected from vaccinated and unvaccinated pigs. Our findings showed that the average rates of CSFV and PRRSV antibody seropositivity were 82.2% (95% CI: 80.1-84.3) and 84.8% (95% CI: 82.5-87.1), respectively, in the immunized group and that these rates were higher than those in the unvaccinated group (58.6% for CSFV and 47.8% for PRRSV). Additionally, the level of CSFV antibody in piglet serum declined gradually with age, whereas PRRSV-specific antibody level increased initially (1 to 2 weeks old) and then declined with age (2 to 4 weeks old). In summary, we investigated the difference in CSFV/PRRSV antibody levels among piglets at various weeks old (1 to 4 weeks) to further establish the duration of maternal immunity in piglets. In addition, routine monitoring of CSFV/PRRSV antibodies in immunized pigs was carried out to evaluate the efficacy of vaccination.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 375-381
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Amino acid substitutions of His296 alter the catalytic properties of Zymomonas mobilis 10232 levansucrase
    Autorzy:
    Li, Shu
    Chen, Ming
    Li, Gang
    Yan, Yong
    Yu, Hai
    Zhan, Yu
    Peng, Zi
    Wang, Jin
    Lin, Min
    Powiązania:
    https://bibliotekanauki.pl/articles/1040841.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Zymomonas mobilis
    His296
    levansucrase
    levan
    transfructosylation activity
    hydrolysis activity
    Opis:
    His296 of Zymomonas mobilis levansucrase (EC 2.4.1.10) is crucial for the catalysis of the transfructosylation reaction. The three-dimensional structures of levansucrases revealed the His296 is involved in the substrate recognition and binding. In this study, nine mutants were created by site-directed mutagenesis, in which His296 was substituted with amino acids of different polarity, charge and length. The substitutions of His296 with Arg or Trp retained partial hydrolysis and transfructosylation activities. The positively charged Lys substitution resulted in a 2.5-fold increase of sucrose hydrolysis. Substitutions with short (Cys or Ser), negatively charged (Glu) or polar (Tyr) amino acids virtually abolished both the activities. Analysis of transfructosylation products indicated that the mutants synthesized different oligosaccharides, suggesting that amino acid substitutions of His296 strongly affected both the enzyme activity and transfructosylation products.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 201-206
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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