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    Wyświetlanie 1-8 z 8
    Tytuł:
    A system reliability-based design optimization for the scraper chain of scraper conveyors with dependent failure modes
    Oparta na niezawodności systemu optymalizacja konstrukcji łańcucha przenośnikowego zgrzebłowego o zależnych przyczynach uszkodzeń
    Autorzy:
    Shuai, Li
    Zhencai, Zhu
    Hao, Lu
    Gang, Shen
    Powiązania:
    https://bibliotekanauki.pl/articles/301804.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    probabilistic analysis
    system reliability
    Copula
    scraper chain
    optimization
    analiza probabilistyczna
    niezawodność systemu
    funkcja kopuły
    łańcuch przenośnikowy zgrzebłowy
    optymalizacja
    Opis:
    With the incomplete probability information, the joint probability distribution modelling and system reliability-based optimization design of structural systems with failure interactions are challenging problems in the domain of reliability. This article is designed to propose a system reliability-based optimization design method for optimizing the scraper chain with multiple failure modes. Firstly, the common failure modes of the scraper chain are analysed. For each failure mode, a reliability model for the failure of scraper chains is obtained. Secondly, aiming at the joint failure probability modelling problem, a method for estimating the failure probability of the scraper chain based on system reliability is proposed. The reliability of scraper chains is calculated by the stochastic perturbation technique and the four-moment method. And then, the optimization design problem is discussed based on system reliability. And the optimal model is established. Finally, the effectiveness of the method is verified by the illustrative example of scraper chains. The proposed joint failure probability estimation method and design optimization are shown in the example. The results obtained can provide a reference for the optimal design of the scraper chain.
    Ze względu na niekompletność danych dotyczących prawdopodobieństwa, modelowanie wspólnego rozkładu prawdopodobieństwa oraz oparte na niezawodności systemu projektowanie optymalizacyjne systemów konstrukcyjnych, w których zachodzą zależności między uszkodzeniami stanowią trudne problemy niezawodnościowe. W artykule zaproponowano metodę optymalizacji konstrukcji łańcucha zgrzebłowego, w której wykorzystuje się obliczenia niezawodności systemu. Ponieważ dla łańcucha tego typu istnieje wiele potencjalnych przyczyn uszkodzeń, w pierwszej kolejności analizowano powszechnie występujące przyczyny uszkodzeń. Dla każdego rodzaju uszkodzenia łańcucha otrzymano model niezawodnościowy. Następnie, mając na uwadze problem modelowania wspólnego rozkładu prawdopodobieństwa uszkodzeń, zaproponowano metodę szacowania prawdopodobieństwa uszkodzenia łańcucha na podstawie niezawodności systemu. Niezawodność łańcuchów zgrzebłowych obliczano za pomocą techniki zaburzeń stochastycznych oraz metody momentu czwartego rzędu. Na podstawie otrzymanej niezawodności systemu, omówiono problem optymalizacji konstrukcji łańcucha oraz wyznaczono model optymalny. Skuteczność proponowanych metod estymacji wspólnego prawdopodobieństwa uszkodzenia i optymalizacji konstrukcji weryfikowano na podstawie przykładu łańcucha zgrzebłowego. Uzyskane wyniki mogą stanowić punkt odniesienia dla optymalnego projektowania łańcuchów zgrzebłowych.
    Źródło:
    Eksploatacja i Niezawodność; 2019, 21, 3; 392-402
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Camera-based PHM method in rotating machinery equipment micro-action scenarios
    Autorzy:
    Junfeng, An
    Liu, Jiqiang
    Zhen, Hao
    Mengmeng, Lu
    Powiązania:
    https://bibliotekanauki.pl/articles/24200809.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    deep learning
    condition monitoring
    Rmcad
    anomaly detection
    defect early warning
    Opis:
    The health operation of rotating machinery guarantees safety of the project. To ensure a good operating environment, current subway equipment inspections frequency is high, resulting in a waste of resources. Small abnormal changes in mechanical equipment will also contribute to the development of mechanical component defects, which will ultimately lead to the failure of the equipment. Therefore, mechanical equipment defects should be detected and diagnosed as soon as possible. Through the use of graphic processing and deep learning, this paper proposes Rmcad Framework with three aspects: condition monitoring, anomaly detection, defect early warning. Using a network algorithm, this paper proposes an improved model that has the characteristics of two-stream and multi-loss functions, which improves the accuracy of detection. Additionally, a defect warning method is constructed to improve the perception ability of equipment before failure occurs and reduce the frequency of frequent maintenance by detecting anomalies according to the degree of opening.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 10
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution Growth of Well-Aligned ZnO Nanorods on Sapphire Substrate
    Autorzy:
    Jia, G.
    Hao, B.
    Lu, X.
    Wang, X.
    Li, Y.
    Yao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399510.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Yz
    78.40.Fy
    68.55.J-
    Opis:
    Vertically well-aligned ZnO nanorods arrays were synthesized on sapphire substrates by chemical bath deposition. Those sapphire substrates were seeded to control the density and orientation of ZnO nanorods using sol-gel method. Well-aligned and uniformly distributed ZnO nanorods in a large scale were obtained with strongly (002) preferential orientation. The structural properties were characterized by X-ray diffraction spectrometer and morphological characteristics were analyzed by scanning electron microscopy, respectively. The ZnO nanorods are obvious hexangular wurtzite structure and preferentially oriented along the c-axis (002) and growth vertically to the substrates. The optical properties were further thoroughly studied. What is more, the influences of the strain between substrate and ZnO nanorods due to thickness of the ZnO seed-layer on the characteristics and optical properties of ZnO were also analyzed.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 74-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of hydrothermally fabricated PbF2:Er3+ particles and their application in bifacial silicon solar cells
    Autorzy:
    Yang, F
    Wu, C.
    Hao, X
    Chen, Y.
    Lu, J.
    Yang, Sh.
    Powiązania:
    https://bibliotekanauki.pl/articles/174503.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    PbF2
    Er3+ particles
    hydrothermal method
    upconversion
    Opis:
    We report the synthesis of PbF2:Er3+ particles using a hydrothermal method. The structure and upconversion emission properties of the products are investigated by scanning electron microscopy, X-ray diffractometer, Raman spectrophotometer and fluorescence spectrometry. An increase in Er3+ concentration in the crystals changes the PbF2 structure from a mixed phase to a cubic phase and decreases the grain size to nanoscale levels. Enhanced upconversion efficiency is achieved after annealing resulted from the formation of the cubic phase and the increase of grain size. The optimal Er3+ concentration is found to be 4% after annealing, and applied to the back of a bifacial silicon solar cell, maximum external quantum efficiencies of 0.38% and 0.79% are respectively obtained under 0.77 W/cm2 laser excitation (1560 nm) and AM1.5 + laser co-excitation.
    Źródło:
    Optica Applicata; 2014, 44, 3; 463-473
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional biomechanical modeling and simulation of trephine cutting cornea for keratoplasty
    Autorzy:
    Su, P.
    Lu, D.
    Deng, S.
    Zhang, L.
    Hao, Y.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/307486.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rogówka
    biomechanika
    kryterium wytężeniowe
    FEM
    cornea
    biomechanics
    failure criterion
    finite element simulation
    Opis:
    Trephination is one of the basic operations of keratoplasty, and the biomechanical mechanism of the operation can be revealed based on three-dimensional modeling and simulation of trephine cutting cornea. Methods: Based on the analysis of the physical and biomechanical characteristics of corneal trephination, a three-dimensional numerical model of corneal trephination is built, where the cornea can be simplified to two layers structure including stroma and epithelium, and the trephine cuts the cornea under the vertical motion load and the rotational motion load. A three-dimensional failure criterion of corneal material is proposed based on the yield strength theory. On this basis, trephination simulation is carried out, and the units of corneal material are removed from the model when they meet the defined failure criterion. Results: Under the given parameters including the velocity, the angle and the angular velocity, the trephine force curves, include the linear cutting force and the rotary cutting force are obtained, and show the change of the forces with displacement during the process of trephination simulation. The maps of the equivalent stress show the destruction and deformation of the cornea. Then, the experiment of robotic trephination is carried out under the same parameters and the effectiveness of the simulation is evaluated. Conclusions: Based on mechanics theory and finite element method, the process of trephine cutting cornea has been reproduced, and the interaction mechanism is revealed, which lays the foundation for the development of real-time simulation and virtual system of the corneal surgery.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 23-33
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of cassiterite and chlorite using carboxymethyl cellulose as a depressant
    Autorzy:
    Hu, Yang
    Ying, Luo Hong
    Zhang, Ying
    Wei, Lu Kuan
    Hao, Guan Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2175422.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The nature and mechanism of interaction between carboxymethyl cellulose (CMC) with cassiterite (and chlorite surfaces) and their effects on the flotation separation process of cassiterite (from chlorite) were investigated by micro-flotation tests, surface adsorption experiments, zeta potential measurements, solution chemical calculation, infrared spectroscopy, and X-ray photo-electron spectroscopy (XPS). The results from single mineral tests revealed that CMC exhibited good selective inhibition effects with cassiterites and chlorites. When the dosage was 12.5 mg/L at pH 8, cassiterite and chlorite recovery was 92.2% and 6.3%, respectively. The artificial mixed ore test revealed that the flotation separation effect was the best when the dosage of CMC was 6.5 mg/L. Cassiterite used during the studies was 75.1% pure. The recovery was 82.8%. The interaction between CMC and the cassiterite surface led to a shift in the zeta potential toward the negative direction. CMC was weakly adsorbed on the cassiterite surface. There was no significant impact on the subsequent collection of sodium oleate. The concentration of C atom increased post interaction, and the potential shifted toward the negative direction. Characteristic CMC peaks were observed at this point. Hydrogen bonds and weak chemisorption interactions between CMC and chlorite affected the interaction between sodium oleate and the chlorite surface. It also affected the flotation results. The cassiterite and chlorite were separated effectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155141
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    RFID tag group recognition based on motion blur estimation and YOLOv2 improved by Gaussian algorithm
    Autorzy:
    Li, Lin
    Yu, Xiao-Lei
    Liu, Zhen-Lu
    Zhao, Zhi-Min
    Zhang, Ke
    Zhou, Shan-Hao
    Powiązania:
    https://bibliotekanauki.pl/articles/2051852.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    RFID
    YOLOv2
    neural network
    GRNN
    Opis:
    Effective recognition of tags in the dynamic measurement system would significantly improve the reading performance of the tag group, but the blurred outline and appearance of tag images captured in motion seriously limit the effectiveness of the existing tag group recognition. Thus, this paper proposes passive tag group recognition in the dynamic environment based on motion blur estimation and improved YOLOv2. Firstly, blur angles are estimated with a Gabor filter, and blur lengths are estimated through nonlinear modelling of a Generalized Regression Neural Network (GRNN). Secondly, tag recognition based on YOLOv2 improved by a Gaussian algorithm is proposed. The features of the tag group are analyzed by the Gaussian algorithm, the region of interest of the dynamic tag is effectively framed, and the tag foreground is extracted; Secondly, the data set of tag groups are trained by the end-to-end YOLOv2 algorithm for secondary screening and recognition, and finally the specific locations of tags are framed to meet the effective identification of tag groups in different scenes. A considerable number of experiments illustrate that the fusion algorithm can significantly improve recognition accuracy. Combined with the reading distance, the research presented in this paper can more accurately optimize the three-dimensional structure of the tag group, improve the reading performance of the tag group, and avoid the interference and collision of tags in the communication channel. Compared with the previous template matching algorithm, the tag group recognition ability put forward in this paper is improved by at least 13.9%, and its reading performance is improved by at least 6.2% as shown in many experiments.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 53-74
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antidiabetic cataract effects of GbE, rutin and quercetin are mediated by the inhibition of oxidative stress and polyol pathway
    Autorzy:
    Lu, Qian
    Hao, Meng
    Wu, Wenya
    Zhang, Nan
    Isaac, Adelusi
    Yin, Jiale
    Zhu, Xia
    Du, Lei
    Yin, Xiaoxing
    Powiązania:
    https://bibliotekanauki.pl/articles/1038521.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Ginkgo biloba extract
    rutin
    quercetin
    diabetic cataract
    Opis:
    One of the earliest critical secondary complications of diabetes is the opacification of the eye lens - a condition strictly associated with diabetic cataract. The study presented here was designed to investigate the effect of Ginkgo biloba extract (GbE), rutin and quercetin on streptozotocin (STZ) induced diabetic cataract (DC) rats. Ten weeks after administration of GbE, rutin and quercetin, the opacity of diabetic rats' lenses was graded under a slit lamp. Then, the levels of malondialdehyde (MDA), reduced glutathione (GSH), advanced glycosylation end products (AGEs), and the activities of aldose reductase (AR) were estimated. The DC-induced rats produced less GSH, higher levels of MDA and AGEs as well as elevated AR activity when compared to the normal group. Administration of GbE, rutin and quercetin remarkably inhibited the AR activity, stimulated the production of glutathione, and decreased the levels of MDA and AGEs in the lenses of DC-induced rats, which eventually delayed the progression of lens opacification in diabetic rats to various degrees. Our results revealed that quercetin had the highest significant (P<0.05) potential to delay the progression of STZ-induced diabetic cataract when compared with rutin and GbE. The mechanism dictating this interesting prowess of quercetin might be attributed to its AR inhibitory strength, anti-lipid peroxidation potential and anti-AGEs activity.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 1; 35-41
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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