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    Wyświetlanie 1-7 z 7
    Tytuł:
    Parameter identification approach using improved teaching and learning based optimization for hub motor considering temperature rise
    Autorzy:
    Li, Yong
    Wang, Yuan
    Zhang, Taohua
    Hu, Han
    Wu, Hao
    Powiązania:
    https://bibliotekanauki.pl/articles/2203368.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parameters identification
    teaching–learning-based optimization
    hub motor
    temperature rise
    Opis:
    Temperature rise of the hub motor in distributed drive electric vehicles (DDEVs) under long-time and overload operating conditions brings parameter drift and degrades the performance of the motor. A novel online parameter identification method based on improved teaching-learning-based optimization (ITLBO) is proposed to estimate the stator resistance, -axis inductance, -axis inductance, and flux linkage of the hub motor with respect to temperature rise. The effect of temperature rise on the stator resistance, -axis inductance, -axis inductance, and magnetic flux linkage is analysed. The hub motor parameters are identified offline. The proposed ITLBO algorithm is introduced to estimate the parameters online. The Gaussian perturbation function is employed to optimize the TLBO algorithm and improve the identification speed and accuracy. The mechanisms of group learning and low-ranking elimination are established. After that, the proposed ITLBO algorithm for parameter identification is employed to identify the hub motor parameters online on the test bench. Compared with other parameter identification algorithms, both simulation and experimental results show the proposed ITLBO algorithm has rapid convergence and a higher convergence precision, by which the robustness of the algorithm is effectively verified.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 1; 99--115
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence on expressway safety of ramps
    Autorzy:
    Hu, J. J.
    Li, F.
    Han, B.
    Yao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/224137.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    expressway safety
    safety
    on and off ramp
    delay
    accidents occurrence probability
    droga ekspresowa
    bezpieczeństwo na drodze ekspresowej
    rampa włączania i wyłączania
    opóźnienie
    prawdopodobieństwo wystąpienia awarii
    Opis:
    As the very important parts of the expressway system, on and off ramps have a great effect on the operation effect of expressways. Once congestion occurs at on and off ramps, it will directly affect the safety of the expressway and vehicles. So this paper first analyzes the location design of on ramps, the length and the influences on the expressway running state of off ramp downstream traffic state, and establishes the expressway operation models based at on and off ramps. The expressway operation models include off ramp delay model, on ramp delay model, expressway delay model and side road delay model under the influence of the distance between on and off ramp and traffic volume. At the same time, the paper analyzes the connection between the traffic operation state and traffic safety, and establishes the expressway safety model based on congestion degree. Through simulation verification, the impact of on and off ramp on the security of the expressway is analyzed. In the simulation, safety rank division is simulated to verify and safety index of different safety ranks. Finally the paper concludes that the delay caused by traffic of the on and off ramps can decrease the safety of expressway.
    Źródło:
    Archives of Transport; 2017, 43, 3; 43-51
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KH2PO4
    Autorzy:
    Deng, X.
    Liu, K.
    Han, X.
    Hu, X.
    Zheng, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/777858.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Permeability
    polymer membrane
    aqueous fertilizer solution
    polymer-coated fertilizer
    Opis:
    With the polymer-coated fertilizer as background, the permeability of P- and K-nutrient through a representative polymer membrane-polystyrene membrane were investigated by measuring their permeability in the solutions of KH2 PO4 -water and urea-KH2 PO4 water at nominal temperature of 298 K using the Ussing chamber method. To analyze and interpret the variation of permeability with solute concentration, the solubility of permeate in polymer membrane were determined experimentally and the permeate diffusion coefficient were assessed by the measurements of density and apparent molar volume of the aqueous fertilizer solutions. An interesting “increase-decrease” trend for the permeability of both phosphorous (P)-nutrient, and potassium (K)-nutrient fertilizer with permeate concentration was observed, in which the increases in permeability at low concentrations of permeate could be attributed to the increase in solubility of KH2 PO4  in polymer while the decreases in permeability at high concentrations was due to the decrease in diffusion coefficient of permeate in polymer membrane. Finally, the release kinetics of these nutrients from a PS-coated urea-KH2 PO4  compound fertilizer granule was predicted using the Shaviv’s model along with the permeability data of P- and K-nutrient generated.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 113-122
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant activity and mechanism in flower of Hylocereus undatus (Haw.) Britt. et Rose
    Autorzy:
    Li, X.
    Gao, Y.
    Han, W.
    Lin, J.
    Hu, Q.
    Chen, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/19838.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Hylocereus undatus flower is commonly used as food or for medicinal purposes in south China. To study its antioxidant activity and mechanism we used antioxidant and chemical assays to compare two commercial samples from different locations (Shenjing, Qixing). The difference in antioxidant levels corresponded with differences in chemical content (including total phenolics, total flavonoids, kaempferol and quercetin) between Shenjing and Qixing. The antioxidant ability of H. undatus flower seems attributable to total phenolics (mainly total flavonoids). Kaempferol is one of the main bioactive components. H. undatus flower exerts its antioxidant effects through metal chelation and radical scavenging via hydrogen atom (H•) and electron (e) donation.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2013, 55, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A velocity measurement method based on scaling parameter estimation of chaotic system
    Autorzy:
    Liu, L.
    Hu, J.
    He, Z.
    Han, C.
    Li, H.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220466.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    parameter estimation
    chaos
    synchronization
    Opis:
    In this paper, we propose a new method of measuring the target velocity by estimating the scaling parameter of a chaos-generating system. First, we derive the relation between the target velocity and the scaling parameter of the chaos-generating system. Then a new method for scaling parameter estimation of the chaotic system is proposed by exploiting the chaotic synchronization property. Finally, numerical simulations show the effectiveness of the proposed method in target velocity measurement.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 275-281
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elevated expression of serine/threonine phosphatase type 5 correlates with malignant proliferation in human osteosarcoma
    Autorzy:
    Han, Kun
    Gan, Zhihua
    Lin, Shuchen
    Hu, Haiyan
    Shen, Zan
    Min, Daliu
    Powiązania:
    https://bibliotekanauki.pl/articles/1038676.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cell proliferation
    lentivirus
    Osteosarcoma
    PP5
    siRNA
    targeted therapy
    Opis:
    Osteosarcoma is the most common primary malignant bone tumor in adolescents and young adults. However, the involvement of serine/threonine phosphatase type 5 (PP5) in osteosarcoma remains unclear. The aim of this study was to evaluate the functional role of PP5 in osteosarcoma cells. Firstly, we found that PP5 is widely expressed in several human osteosarcoma cell lines. Then we used lentivirus-delivered siRNA to silence PP5 expression in Saos-2 and U2OS cell lines. Knockdown of endogenous PP5 expression by shRNA-expressing lentivirus significantly decreased the viability and proliferation of the osteosarcoma cells. Moreover, FACS analysis showed that knockdown of PP5 expression induced a significant arrest in the G0/G1 phase of the cell cycle, which was associated with the inhibition of cell proliferation. Therefore, knockdown of PP5 is likely to provide a novel alternative to targeted therapy of osteosarcoma and deserves further investigation.
    Źródło:
    Acta Biochimica Polonica; 2017, 64, 1; 11-16
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of ethanol-assisted mixing on the selected properties and homogeneity of NR/BR blends
    Wpływ mieszania wspomaganego etanolem na wybrane właściwości i jednorodność mieszanek NR/BR
    Autorzy:
    Meng, Chao
    Gu, Zheng
    Sui, Jinyong
    Wang, Jianfa
    Li, Peiyao
    Hu, Shaokai
    Zhang, Susu
    Zhang, Xiaoyi
    Wang, Haoyu
    Han, Shaolong
    Yang, Zhifei
    Powiązania:
    https://bibliotekanauki.pl/articles/24202782.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    natural rubber
    butadiene rubber
    blends
    dispersion
    kauczuk naturalny
    kauczuk butadienowy
    mieszaniny
    dyspersja
    Opis:
    The effect of the mixing method (normal and ethanol-assisted) on selected properties of natural rubber with butadiene rubber blends (NR/BR 80/20) was investigated. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to evaluate the properties. In addition, the mechanical tensile properties, tear resistance and thermal aging, as well as vulcanization characteristic were determined. It was found that ethanol-assisted mixing can significantly improve the mechanical properties and thermal stability of the blends as a result of better dispersion of additives in the rubber matrix.
    Zbadano wpływ metody mieszania (tradycyjna i wspomagana etanolem) na wybrane właściwości mieszanin kauczuku naturalnego z kauczukiem butadienowym (NR/BR 80/20). Do oceny właściwości zastosowano skaningową mikroskopię elektronową (SEM), spektroskopię w podczerwieni z transformacją Fouriera (FTIR) oraz analizę termograwimetryczną (TGA). Ponadto oznaczono właściwości mechaniczne przy rozciąganiu, odporność na rozdzieranie i starzenie termiczne, a także właściwości wulkanizacyjne. Stwierdzono, że mieszanie wspomagane etanolem może znacząco poprawić właściwości mechaniczne i stabilność termiczną mieszanin NR/BR, jako efekt lepszej dyspersji dodatków w osnowie gumowej.
    Źródło:
    Polimery; 2023, 68, 3; 142--148
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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