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    Wyświetlanie 1-5 z 5
    Tytuł:
    Selective extraction of vanadium from vanadium-titanium magnetite concentrates by non-salt roasting of pellets-H2SO4 leaching process
    Autorzy:
    Luo, Yi
    Che, Xiaokui
    Wang, Haixia
    Zheng, Qi
    Wang, Lei
    Powiązania:
    https://bibliotekanauki.pl/articles/1445902.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vanadium-titanium magnetite
    pellets
    selective extraction
    sulfuric acid leaching
    Opis:
    In this work, a novel process of pellet non-salt roasting and H2SO4 leaching was proposed for the selective extraction of vanadium from vanadium–titanium magnetite concentrate. Vanadium can be leached but the iron impurity was maintained in the pellets. Moreover, the leached pellets can meet the quality requirements of the iron-making process after secondary roasting, realizing comprehensive utilization. The maximal vanadium leaching efficiency was up to 60.3%, whereas 0.17% of the iron impurity was leached. The optimum conditions of pellet roasting and leaching were obtained by single-factor experiments. The X-ray diffraction and scanning electron microscopy–energy disperse X-ray spectrometry analyses showed that the vanadium iron spinel can be oxidized and decomposed into Fe2O3 and vanadate during the roasting process. Given that dilute sulfuric acid can react with vanadate without reacting with Fe2O3 in the leaching process, selective vanadium extraction was realized. This work provides new insights into the industrial production of vanadium–titanium magnetite concentrate involving the direct extraction of vanadium.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 36-47
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barycenter reflected equatorial Pacific sea level structure evolution and its indication of ENSO events
    Autorzy:
    Luo, W.
    Yi, L.
    Yu, Z.
    Sun, H.
    Yuan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/49107.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea level
    El Nino-Southern Oscillation
    Equatorial Pacific
    satellite altimetry
    principal tensor analysis
    barycenter method
    Źródło:
    Oceanologia; 2015, 57, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual–real fusion maintainability verification based on adaptive weighting and truncated spot method
    Autorzy:
    Ge, Zhexue
    Zhang, Yi
    Wang, Fang
    Luo, Xu
    Yang, Yongmin
    Powiązania:
    https://bibliotekanauki.pl/articles/2200935.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    virtual–real fusion maintainability
    maintainability verification
    adaptive weighting method
    truncated SPOT method
    Opis:
    Maintainability is an important general quality characteristic of products. Insufficient maintainability will lead to long maintenance time and high maintenance cost, thus affecting the availability of products. Maintainability verification is an important means to ensure maintainability meets design requirements. However, the cost of traditional real maintainability verification method is very high, and the virtual maintenance method has insufficient verification accuracy due to the lack of large maintenance force feedback when the human body is moving. In order to reduce the evaluation error and test sample size, the paper conducts maintainability verification based on the mixed physical and virtual maintainability test scenarios. Aiming at the problem that traditional methods are difficult to deal with the real test information and synchronous virtual simulation information in the test process, this study proposes a virtual–real fusion maintainability evaluation algorithm based on adaptive weighting and truncated SPOT (Sequential Posterior Odd Test) method. It can weigh real test information and virtual human simulation information adaptively to obtain a virtual–real fusion maintainability test sample. Then, the SPOT method is used to evaluate the maintainability of small samples. The adjustment of valve clearance, replacement of air filter element and replacement of starting motor maintenance tasks of ship engine are taken as examples for demonstration. The virtual–real fusion and virtual maintainability verification methods are respectively used for verification, and compared with the physical maintenance scenario constructed by 3D printing, indicating that the accuracy of virtual–real fusion maintainability test verification is 89%, while the virtual maintainability verification is only 33%.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 4; 738--746
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the level structure of 90Nb nucleus using the shell model
    Autorzy:
    Yi-Heng, Wu
    Dong, Yang
    Ke-Yan, Ma
    Peng-Wei, Luo
    Powiązania:
    https://bibliotekanauki.pl/articles/147040.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    high spin state
    level structure
    proton excitation
    shell model
    Opis:
    Shell model calculations have been carried out for 90Nb nucleus with the model space in which the valence protons occupy the f5/2, p3/2, p1/2, and g9/2 orbitals and the valence neutrons occupy the p1/2, g9/2, d5/2, and g7/2 orbitals. According to the calculated results, the negative parity is from the contribution of the proton of the f5/2, p3/2, and p1/2 orbits. The moderate spin states of 90Nb are mainly due to the excitation of protons from the f5/2 and p3/2 orbits to the p1/2 and g9/2 orbits across the Z = 38 subshell closure, and the high spin states arise from the excitation of a single neutron from the g9/2 orbit into the d5/2 orbit across the N = 50 shell closure.
    Źródło:
    Nukleonika; 2019, 64, 4; 113-116
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise quantization simulation analysis of optical convolutional networks
    Autorzy:
    Zhang, Ye
    Zhang, Saining
    Zhang, Danni
    Su, Yanmei
    Yi, Junkai
    Wang, Pengfei
    Wang, Ruiting
    Luo, Guangzhen
    Zhou, Xuliang
    Pan, Jiaoqing
    Powiązania:
    https://bibliotekanauki.pl/articles/27310111.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical neural network
    convolutional neural network
    noise
    quantization
    Opis:
    Optical neural network (ONN) has been regarded as one of the most prospective techniques in the future, due to its high-speed and low power cost. However, the realization of optical convolutional neural network (CNN) in non-ideal cases still remains a big challenge. In this paper, we propose an optical convolutional networks system for classification problems by applying general matrix multiply (GEMM) technology. The results show that under the influence of noise, this system still has good performance with low TOP-1 and TOP-5 error rates of 44.26% and 14.51% for ImageNet. We also propose a quantization model of CNN. The noise quantization model reaches a sufficient prediction accuracy of about 96% for MNIST handwritten dataset.
    Źródło:
    Optica Applicata; 2023, 53, 3; 483--493
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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