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    Wyświetlanie 1-11 z 11
    Tytuł:
    Insight into the effect of galvanic interactions between sulfide minerals on the floatability and surface characteristics of pyrite
    Autorzy:
    Yang, Bo
    Tong, Xiong
    Xie, Xian
    Huang, Lingyun
    Powiązania:
    https://bibliotekanauki.pl/articles/1448232.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    galvanic interaction
    floatability
    pyrite
    sulfide minerals
    Opis:
    Complex sulfide ores are usually found as a mixture of various sulfide and gangue minerals, and froth flotation is the predominant method for the selective separation of sulfide minerals. Adherence and contact between sulfide minerals are inevitable during froth flotation, and galvanic interactions between sulfide minerals will occur because of differences in rest potentials. However, the effect of these galvanic interactions on the selective flotation of sulfide minerals have been rarely studied. In this work, the effect of the galvanic interaction between pyrite and sphalerite on the flotation behavior and surface characteristics of pyrite was investigated by micro-flotation tests, collector adsorption tests, electrochemical techniques and XPS (X-ray photoelectron spectroscopy) surface analysis. The micro-flotation tests indicated that the floatability of pyrite decreased in the pH range of 4.0 to 9.5 and increased under strongly alkaline pH conditions (pH > 10) due to the galvanic interaction. The collector adsorption results demonstrated that the adsorption capacity of the collector on the pyrite surface was significantly reduced because of the galvanic interaction between pyrite and sphalerite. The electrochemical measurements revealed that the decrease in the oxidation current of xanthates to dixanthogen was responsible for the decreasing adsorption capacity of the collector on the pyrite surface. The XPS results indicated that the formation of the $S_O_3^{2-}$ oxidation product on the pyrite surface decreased at a strongly alkaline pH due to the galvanic interaction. Therefore, pyrite floatability improved at an alkaline pH. These results consistently showed that the galvanic interaction between pyrite and sphalerite had an important influence on the floatability and surface characteristics of pyrite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 24-33
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of particle size on the oxidation and flotation behavior of galena particles
    Autorzy:
    Lu, Yalin
    Tong, Xiong
    Xie, Xian
    Yang, Bo
    Hua, Zhongbao
    Powiązania:
    https://bibliotekanauki.pl/articles/110497.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    galena
    particle size
    surface oxidation
    flotation behavior
    Opis:
    The aim of this study was to determine the effect of particle size on the oxidation and flotation behavior of galena particles. Coarse (-0.074+0.038 mm), intermediate (-0.038+0.025 mm) and fine (-0.025 mm) galena particles were used in this study. Dissolution tests demonstrated that the amount of oxidation products increased with the decrease of particle sizes. The surface oxidization of galena was the greatest at pH 7.3, followed by pH 12 and 9, which were consist with the result of XPS. The micro-flotation results indicated that the effect of pH on the flotation recovery of galena enhanced with the reduction of particle sizes. The decreasing of particle sizes increases both the sorption rate of collector and the dissolution of galena, while the generation of hydrophilic product caused by dissolution is dominant, rendering the mineral hydrophilic. This study shows the differences in the surface oxidation and flotation behavior of different size fractions of galena particles. To promote the flotation recovery of the fine size fraction of galena particles, alleviating their oxidation is the key.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 208-216
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on particle movement characteristics in sandblast cylinder based on PIV technology
    Autorzy:
    Hui, Zhiquan
    Wu, Feng
    Duan, Haojie
    Yang, Bo
    Lin, Jinmei
    Wang, Lian
    Huang, Si
    Powiązania:
    https://bibliotekanauki.pl/articles/778390.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    PIV technology
    Sandblast cylinder
    Particles
    Movement characteristics
    Opis:
    PIV technology was used to investigate the influence of the particles’ relevant parameters on the instantaneous movement characteristics in the sandblast cylinder under the circumstance of different particle sizes, different section heights and different stacking conditions. As the diameter increased, particles had a greater velocity and energy when approaching the wall, which would cause a serious abrasion. The influence of test selection factors on the particles’ radial velocity of particles was greater than that on axial velocity. The radial velocity and axial velocity on the surface of the cylindrical section were all reduced to a lower level when the particles approach the tank wall. When r > 0.3 R, the particle velocity maintained at a higher level, but then decreased slowly when r > 0.7 R. Therefore, the abrasion of the conical section of the sandblast cylinder when r > 0.3 R should be paid more attention to.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 38-47
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A second-order TV-based coupling model and an ADMM algorithm for MR image reconstruction
    Autorzy:
    Zhou, Bo
    Yang, Yu-Fei
    Hu, Bo-Xia
    Powiązania:
    https://bibliotekanauki.pl/articles/330846.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    MRI reconstruction
    LLT model
    LOT model
    coupling model
    ADMM algorithm
    split Bregman
    wavelet transform
    rezonans magnetyczny
    metoda Bregmana
    transformata falkowa
    Opis:
    Motivated by ideas from two-step models and combining second-order TV regularization in the LLT model, we propose a coupling model for MR image reconstruction. By applying the variables splitting technique, the split Bregman iterative scheme, and the alternating minimization method twice, we can divide the proposed model into several subproblems only related to second-order PDEs so as to avoid solving a fourth-order PDE. The solution of every subproblem is based on generalized shrinkage formulas, the shrink operator or the diagonalization technique of the Fourier transform, and hence can be obtained very easily. By means of the Barzilai–Borwein step size selection scheme, an ADMM type algorithm is proposed to solve the equations underlying the proposed model. The results of numerical implementation demonstrate the feasibility and effectiveness of the proposed model and algorithm.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 113-122
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Muscle fatigue related to human posture using a brush cutter for landscape gardening: a preliminary study
    Autorzy:
    Yang, Wanying
    Li, Bo
    Li, Shusen
    Zhang, Yanlin
    Yang, Hongze
    Powiązania:
    https://bibliotekanauki.pl/articles/2082518.pdf
    Data publikacji:
    2022-06-20
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    working posture
    muscle activity
    occupational diseases
    ergonomics of work
    agriculture and forestry
    brush cutter
    Opis:
    Background: Brush cutters are widely used in Chinese landscape gardening and agricultural laboring which leads the operators being exposed to many risks. Low back pain (LBP) is particularly common and can lead to substantial personal, community and financial burdens. The aim of the presented study was to measure the activity and function of each torso muscle of the operator when using the bush cutter, so as to evaluate the muscle injury of the operator during using several common brush cutters for different landscape tasks. Material and Methods: The human postures of 6 workers using 2 types of brush cutters in the 3 working conditions were recorded and measured by using a surface electromyography (sEMG) system and a camera. The test results were compared by t-test and sign test. The effect of human posture on the sEMG signal of trunk muscles in different working condition were analyzed by ANOVA. Results: In the 3 working conditions, except for the left trapezius muscle, the muscle load of operating the backpack brush cutter is higher than that of operating side-mounted brush cutter. When operating the side-mounted backpack brush cutter, the force on both sides of the trapezius muscle is uneven, the load of the left trapezius muscle is >25%, and the maximum value is >30%. Conclusions: The results highlighted significant differences in the effects of different working postures on the muscle activities of workers’ trunk. Safe operation standards should therefore be taken to protect the exposed workers and to improve the industrial design of irrigation cutters to prevent the occurrence of occupational diseases.
    Źródło:
    Medycyna Pracy; 2022, 73, 3; 201-207
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of oat β-glucan on in vitro digestion characteristics of set-type yogurt
    Autorzy:
    Qu, Xiaoqing
    Li, Bo
    Yang, Wei
    Nazarenko, Yuliya
    Powiązania:
    https://bibliotekanauki.pl/articles/2142863.pdf
    Data publikacji:
    2022
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    oat beta-glucan
    yogurt
    in vitro digestion
    antioxidative activity
    cholesterol solubility
    beta-glukan z owsa
    jogurt
    trawienie in vitro
    aktywność antyoksydacyjna
    rozpuszczalność cholesterolu
    Opis:
    The main objective of the study was to evaluate the effect of added 0.3% (w/w) oat β-glucan (OG) in set-type yogurt on its protein digestion using an in vitro gastrointestinal model. During gastric digestion phase, the amount of soluble proteins and peptides increased to 25% and 40% for control yogurt (yogurt without OG) and 0.3% OG yogurt, respectively. Buccal digestion has little effect on the structure of yogurts, while large spherical vesicles were formed for both control yogurt and 0.3% OG yogurt after gastric digestion. The presence of 0.3% OG promoted the hydrolysis of yogurt in the gastric digestion phase and caused higher antioxidant activity. Compared with that of control yogurt, the inhibition of cholesterol solubility of 0.3% OG yogurt showed no differences after buccal digestion but significantly higher after gastrointestinal digestion (21.3% for gastric and 22.7% for intestinal digestion). Overall, this study enhances the understanding of digestion characteristics of 0.3% OG-fortified set-type yogurt and provides a theoretical basis for the development of this kind of dairy products.
    Źródło:
    Acta Innovations; 2022, 43; 5-14
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on creep-fatigue model of anchored jointed rock mass
    Autorzy:
    Song, Yang
    Fan, Bo
    Li, Yong-Qi
    Wang, He-Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/2200878.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    shear creep
    anchored jointed rock mass
    fractional order
    fatigue load
    damage
    Opis:
    To explore the mechanical response of anchored rock mass with an interaction of fatigue and creep, this paper selects the fatigue amplitude and fatigue frequency as influencing factors to carry out a fatigue-creep experiment of the anchored rock mass. Based on fractional order theory and binary perturbation theory, a new fractional order creep model is constructed. The results show that compared with the Burgers model, the newly proposed creep model can better describe the whole process of creep deformation of the anchored jointed rock mass under fatigue loading.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 163--173
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coevolution of Paleo-Tethys and Rheic: New tectonic constraints from Iran and Turkey
    Autorzy:
    Chu, Yang
    Wan, Bo
    Lin, Wei
    Allen, Mark B.
    Talebian, Morteza
    Uysal, Ibrahim
    Xin, Guangyao
    Powiązania:
    https://bibliotekanauki.pl/articles/24202110.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    tectonics
    Iran
    Turkey
    Opis:
    In the Paleozoic, one large ocean once separated the Eurasia of the north and the Gondwana of the south, but it has two names, Paleo-Tethys and Rheic, suggesting different tectonic history. The Paleo-Tethys represent the ocean from east Asia to Middle East regions and vanished in Early Mesozoic, while the Rheic existed across the Europe and finally closed in Carboniferous. The two oceans coevolved for a long time, but the interaction and mutual effect at subduction and collision stages are not well understood. Initiation processes of ocean spreading, subduction and collision are crucial in plate tectonics, so resolving the timing for these turning points may greatly enhanced the precision and accuracy of reconstruction of the two oceans, especially for the western Paleo-Tethys. In NE Iran, we find that all the Paleozoic clastic rocks record two major zircon U-Pb age groups peaked at ~800 Ma and ~600 Ma. Consistency in age patterns show a dominant provenance from Neoproterozoic basement of the north Gondwana and a long-lasting passive margin sedimentation after the spreading of the Paleo-Tethys. This environment was interrupted by initial collision between the Turan (Eurasia) and Central Iran (Gondwana) Blocks with massive coarse clastic deposition, i.e. the protolith of the Mashhad Phyllite, in a peripheral foreland basin on the Paleozoic passive margin. The Mashhad Phyllite yields a striking provenance change from passive margin to active margin. The Paleozoic ages reveal a long-lived subduction zone at the south Turan Block initiated since the latest Ordovician. More importantly, the provenance shift better constrains the initial collision timing with the maximum deposition age of the Mashhad Phyllite (~228 Ma) refining the evolution history of Paleo-Tethys. Based on our new results and previous data, we compare the tectonic history of the Paleo-Tethys in its western segment with eastern Rheic, and further discuss the interaction between the Rheic and Paleo-Tethys. We find existence of a lateral subduction zone plays a crucial rule in initiating new subduction zone after an old oceanic plate vanishes and two continents collides, while a lateral collision can also result into shallowing of subducted slab and preservation of coeval compressional structures. These new insights help us to better interpret the emplacement of high-pressure metamorphic rocks during subduction and subduction zone jump when the Rheic and Paleo-Tethys coevolved.
    Źródło:
    Geotourism / Geoturystyka; 2023, 1-2 (72-73); 15--15
    1731-0830
    Pojawia się w:
    Geotourism / Geoturystyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure-based sealing reliability analysis considering dynamic interval and hybrid uncertainties
    Autorzy:
    Sun, Bo
    Yang, Xi
    Ren, Yi
    Wang, Zili
    Antosz, Katarzyna
    Loska, Andrzej
    Jasiulewicz-Kaczmarek, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1841699.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    reliability analysis
    dynamic interval
    hybrid uncertainty
    physics of failure
    sealing
    Opis:
    In the reliability analysis of a sealing structure, radial clearance of the contact surface is usually regarded as a failure criterion, and the sample size is usually quite small, which brings great challenges to uncertainty quantification. Therefore, this paper proposes a reliability analysis method based on the leakage mechanism of the sealing. With the application of dynamic interval, the proposed method can be used to deal with problem of degradation in small sample to evaluate reliability. Moreover, the dynamic reliability with the mixture of the probabilistic and non-probabilistic variables can be obtained using the proposed method. An illustrative numerical case study of a spool valve is conducted in order to validate the proposed method and the implemented reliability sensitivity analysis. The proposed method is of great help in evaluating and predicting reliability with small degradation sample and hybrid uncertainties.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 2; 278-284
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Counterion effects on the alkali dissolution mechanism of quartz
    Autorzy:
    Yao, Yu-yun
    Tang, Yun
    Yang, Yong
    Li, Guo-hui
    Wu, Bo
    Dai, Wen-zhi
    Powiązania:
    https://bibliotekanauki.pl/articles/2200337.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    counterion
    quantum chemistry
    hydrolysis
    mechanism
    Opis:
    In gold ore, quartz plays an important role in mineral formation by acting as the follower. Understanding counterion release, transport, and deposition in alkali solution is a prerequisite for evaluating the potential role of gold separate from quartz deposits in pretreatment. In this work, the aggregation, retention, and release of counterion in alkali solution media were investigated by kinetic research and pure mineral experiments, the correlation and mechanism of these processes were revealed by combining geochemical theory, interaction energy calculation, and quantum chemistry. The results showed that the retention and release of counterion were closely related to the dissolution and corrosion rate of quartz. The NH4+ and Fe2+ with higher mineral affinity reduced the quartz stability, and the dispersion stability and mobility of the quartz were greatly improved by an alkaline substance due to the enhancement of steric hindrance effects. Quantum chemical calculation results show that ammonium ion promotes the dissolution of quartz stronger than ferrous ion, which is mainly reflected in reducing the activation energy required for the formation of transition state (TS1), which can be verified by kinetic calculation. These findings provide essential insight into the extraction of gold coated by quartz as well as a vital reference for the experiment of gold-loaded quartz leaching in mineral processing.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 160038
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physics-of-failure and computer-aided simulation fusion approach with a software system for electronics reliability analysis
    Metoda i oprogramowanie do analizy niezawodności urządzeń elektronicznych oparte na połączeniu metodologii fizyki uszkodzeń i symulacji komputerowej
    Autorzy:
    Sun, Bo
    Li, Yu
    Wang, Zili
    Li, Zhifeng
    Xia, Quan
    Ren, Yi
    Feng, Qiang
    Yang, Dezhen
    Qian, Cheng
    Powiązania:
    https://bibliotekanauki.pl/articles/301540.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    physics of failure
    reliability analysis
    electronics
    prognostics and health management
    computeraided simulation
    software system
    fizyka uszkodzeń
    analiza niezawodności
    urządzenia elektroniczne
    prognostyka i zarządzanie zdrowiem
    symulacja komputerowa
    system oprogramowania
    Opis:
    Electronics, such as those used in the communication, aerospace and energy domains, often have high reliability requirements. To reduce the development and testing cost of electronics, reliability analysis needs to be incorporated into the design stage. Compared with traditional approaches, the physics of failure (PoF) methodology can better address cost reduction in the design stage. However, there are many difficulties in practical engineering applications, such as processing large amounts of engineering information simultaneously. Therefore, a flexible approach and a software system for assisting designers in developing a reliability analysis based on the PoF method in electronic product design processing are proposed. This approach integrates the PoF method and computer-aided simulation methods, such as CAD, FEM and CFD.The software system integrates functional modules such as product modeling, load-stress analysis and reliability analysis, which can help designers analyze the reliability of electronic products in actual engineering design. This system includes software and hardware that validate the simulation models. Finally, a case study is proposed in which the software system is used to analyze the filter module reliability of an industrial communication system. The results of the analysis indicate that the system can effectively promote reliability and can ensure the accuracy of analysis with high computing efficiency.
    Urządzenia elektroniczne, na przykład te używane w łączności, lotnictwie i energetyce, często muszą spełniać wysokie wymagania dotyczące niezawodności. Aby zmniejszyć koszty rozwoju i testowania tego typu urządzeń, należy opracować metodę analizy niezawodności, którą można wykorzystywać już na etapie projektowania. Metodologia fizyki uszkodzeń (PoF) pozwala, lepiej niż tradycyjne podejścia, rozwiązywać problemy związane z niezawodnością już na etapie powstawania projektu. Jednak jej zastosowanie w praktyce inżynierskiej nastręcza wielu trudności, związanych, między innymi, z koniecznością jednoczesnego przetwarzania dużych ilości informacji inżynieryjnych. W związku z tym, w przedstawionej pracy zaproponowano elastyczne podejście oraz system oprogramowania, które mogą być wykorzystywane przez projektantów do opracowania analizy niezawodności produktu elektronicznego w opaciu o PoF na etapie projektowania. Podejście to stanowi połączenie metody PoF i metod symulacji komputerowej, takich jak CAD, FEM i CFD. System oprogramowania zawiera moduły funkcjonalne, takie jak modelowanie produktu, analiza obciążeń, analiza niezawodności i inne, które mogą wspomagać projektantów w analizie niezawodności projektowanych przez nich produktów elektronicznych. Na system ten, oprócz oprogramowania składa się także sprzęt komputerowy, który służy do walidacji modeli symulacyjnych. W artykule przedstawiono studium przypadku, w którym zaproponowany system oprogramowania wykorzystano do analizy niezawodności modułu filtra wykorzystywanego w systemie łączności przemysłowej. Wyniki analizy pokazują, że opracowane oprogramowanie skutecznie poprawia niezawodność urządzeń jak też zapewnia dokładność analizy przy jednoczesnej wysokiej wydajności obliczeniowej.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 2; 340-351
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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