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    Wyświetlanie 1-5 z 5
    Tytuł:
    Beneficiation of Ga from alunite concentrates by selective acid leaching and alkaline precipitation
    Autorzy:
    Zhu, Mao-Lan
    Chen, Hang
    Zhong, Shui-Ping
    Huang, Zhong-Sheng
    Chen, Xi
    Hu, Zhi-Biao
    Powiązania:
    https://bibliotekanauki.pl/articles/110733.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gallium
    selective leaching
    precipitation
    alunite concentrate
    Opis:
    In this study beneficiation of Ga from alunite ore was investigated. The effects of the calcination temperature, H2SO4 concentration, leaching temperature and liquid-solid ratio on the dissolution characteristic of Ga, K and Al were studied. The results showed that increasing the calcination temperature, H2SO4 concentration and leaching temperature can improve the solubility of K and Al. However, higher H2SO4 concentration and lower leaching temperature can improve the dissolution of Ga, which was beneficial to recovery of Ga. On the basis of the solubility difference in H2SO4, a two-stage process of selective acid leaching and alkali precipitation of Ga was proposed. The concentration of Ga was increased significantly from 54 g/t in alunite ore to 4100 g/t in alkali precipitation product. The major elements of Al and K in alunite were recovered as the alum crystal with a purity of 99.62%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 1028-1038
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Pressure-Dependent Plasticity Model for Polymer Bonded Explosives under Confined Conditions
    Autorzy:
    Wei, Qiang
    Huang, Xi-cheng
    Chen, Peng-wan
    Liu, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/27787985.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    polymer bonded explosives
    constitutive model
    damage model
    confining pressure
    mechanical response
    Opis:
    The safety of explosives is closely related to the stress state of the explosives. Under some stress stimulation, explosives may detonate abnormally. It is of great significance to accurately describe the mechanical response of explosives for the safety evaluation of explosives. The mechanical properties of polymer bonded explosives (PBXs) strongly depend on pressure. In this study, the mechanical behaviour of PBXs under confined conditions was investigated. It was found that the stress-plastic strain response of a PBX under high confining pressures is a combination of the non-linear and linear hardening portions. However, the linear hardening portion has often been neglected in characterizing the mechanical behaviour of a PBX under such pressures. The Karagozian and Case (K&C) model was applied to characterize the mechanical behaviour of PBXs. The numerical results demonstrated that when the confining pressure was high, the K&C model could not adequately match the experimental data due to the limitation of the damage model. Therefore, a new damage model was developed by means of considering intragranular damage and transgranular damage. This modification made it possible to introduce a linear hardening process into the original K&C model. The method proposed to describe the stress-strain results under high confining pressures was to consider the stress-plastic strain curve, including the nonlinear and linear hardening portions. The damage evolution of the original K&C model and a linear hardening model were applied for the nonlinear and linear hardening portions respectively. The influence of the linear hardening model on the damage evolution of the original K&C model was included when describing the nonlinear hardening portion. A comparison between simulation and experiment showed that the modified K&C model could well describe the mechanical response of PBXs under different confining pressures.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 3; 339--368
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Elasticity on Electrical Properties of Weft-Knitted Conductive Fabrics
    Wpływ elastyczności na właściwości elektryczne dzianin przewodzących
    Autorzy:
    Han, Xiaoxue
    Miao, Xuhong
    Chen, Xi
    Niu, Li
    Wan, Ailan
    Powiązania:
    https://bibliotekanauki.pl/articles/1419928.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    elasticity
    weft knitted fabric
    sensing performance
    flexible sensors
    elastyczność
    dzianina rządkowa
    skuteczność wykrywania
    elastyczne czujniki
    Opis:
    Because of softness and lightness, various flexible sensors have attracted extensive attention and been widely studied. Sensing mechanism of most wearable sensors is derived from an elastic substrate, such as fabric or polymer materials. Although the mechanical-electrical performance of several flexible sensors has been reported, including sensitivity, linearity hysteresis and repeatability, research on the effects of substrate elasticity on sensor capacity is scarce. In this paper, the impact of spandex content, washing and ironing processing on the elasticity of weft knitted sensors was investigated by the constant- extension test method. Afterwards, differences in sensing properties between diverse elastic sensors under single as well as repeated stretch were reported. The experimental results showed that spandex content does influence the elasticity of knitted fabric, which has a further great effect on sensing properties. A highly elastic sensor is capable of detecting large-scale human motions, while sensors with lower elasticity are opposite, which demonstrates that elastic sensors can be designed and chosen to meet the requirements of detecting and monitoring distinct human motions.
    Ze względu na swoją delikatność i lekkość czujniki elastyczne przyciągają uwagę i są często stosowane. Często opisywane jest działanie mechaniczno-elektryczne kilku elastycznych czujników, w tym czułość, histereza liniowości i powtarzalność, badania nad wpływem elastyczności podłoża na pojemność czujnika są dość rzadkie. W pracy zbadano wpływ zawartości spandex’u, obróbki prania i prasowania na sprężystość dzianin wątkowych metodą badania stałego rozciągania. Następnie odnotowano różnice we właściwościach wykrywania między różnymi czujnikami sprężystymi przy pojedynczym i powtarzanym rozciągnięciu. Wyniki eksperymentalne wykazały, że zawartość spandex’u wpływa na elastyczność dzianiny, co dodatkowo ma duży wpływ na właściwości wyczuwalne. Wyniki pokazały, że wysoce elastyczny czujnik jest w stanie lepiej wykrywać ruchy człowieka, niż czujniki o niższej elastyczności, co pokazuje, że czujniki elastyczne można zaprojektować i wybrać tak, aby spełniały wymagania wykrywania i monitorowania różnych ruchów człowieka.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 1 (145); 47-52
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machine vision based Vernier caliper reading technology research
    Autorzy:
    Chen, Wen-Meng
    Wang, Hong-Xi
    Wang, Guan-Wei
    Liang, Wen-Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/2173903.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Vernier calipers
    convolutional neural networks
    error averaging
    alternate projection
    Opis:
    Accurate and fast access to Vernier caliper readings is a critical issue in automated verification of Vernier calipers. To address this problem, this paper proposes a machine vision-based algorithm for reading the Vernier caliper’s displayed value. The suggested method first employs threshold segmentation and template matching to determine the region of interest and obtain the main ruler digit position by alternate projection. Then, we apply the improved LeNet5 network to identify the main ruler of the Vernier caliper, Moreover, we developed the first and last inscription method for reading the decimal part of the Vernier caliper and established our data set for model training. Extensive experiments on reading the displayed value have demonstrated our algorithm’s accuracy, which achieves a displayed value reading accuracy of 100%. Compared to other methods, the proposed technique affords better stability and accuracy.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 4; 779--793
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Acoustic Scattering Characteristics of Multi-Sections Conning Tower Geometries in Monostatic Configuration
    Autorzy:
    Han, Lin-Jiang
    Song, Hao
    Chen, Chang-Xiong
    Peng, Xi-Rui
    Peng, Zi-long
    Powiązania:
    https://bibliotekanauki.pl/articles/2141632.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conning tower
    Kirchhoff approximation
    target strength
    monostatic configuration
    Opis:
    The overall acoustic echo of a submarine is greatly dependent on the conning tower. For enhancing the acoustic stealth performance of a submarine, it is necessary to research an innovative design scheme of the conning tower to reduce its target strength (TS). The aim of this work is to reduce the TS of a conning tower by varying its geometry and streamlining. The accuracy in modelling the acoustic scattering of a conning tower using the Kirchhoff approximation (KA) was validated, compared with finite element analysis (FEA). Several angular conning tower geometries were designed to analyze the effect of streamlining and the number of lateral facets on TS using the KA method. In consideration of the actual situation, the acoustic effect of backing medium was analyzed by compared water-filled elastic hulls with rigid hulls. From the observed TS calculation results, it is shown that the non-streamlined four lateral-facet conning tower geometries are optimal for acoustic stealth performance during the range of incidence angles from −10° to 10°, whereas the streamlined versions have better performance at incidence angles beyond this range. Furthermore, elastic hulls and rigid hulls provide similar spatial distribution regularities in monostatic configuration with the rigidity affecting the magnitude of the TS.
    Źródło:
    Archives of Acoustics; 2022, 47, 3; 307-317
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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