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    Wyświetlanie 1-9 z 9
    Tytuł:
    Influence of montmorillonite hydration and delamination on coal flotation
    Autorzy:
    Zhang, Lucheng
    Zhang, Mingqing
    Liu, Qi
    Song, Shuoshuo
    Tian, Yu
    Barvora, Joshua Bosco
    Powiązania:
    https://bibliotekanauki.pl/articles/2175432.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coal flotation
    montmorillonite
    hydration
    delamination
    slime coating
    Opis:
    In this study, the influence of montmorillonite (MT) hydration and delamination on coal flotation was investigated through flotation tests using coal-MT mixtures. MT particles were subjected to hydration at different time intervals. The Fuerstenau upgrading curve was plotted to evaluate the change in overall flotation selectivity. The zeta potential and particle size distribution were used to characterize the delamination behavior of MT in deionized water at natural pH level. Atomic force microscopy (AFM) (colloidal probe) was used to analyze the interaction force between coal and MT particles. It was found that smaller particles (individual silicate layers or thin packets of layers) with higher zeta potentials appeared gradually, and their volume proportion increased with increasing hydration time. AFM results showed that a monotonous repulsive force was detected consistently throughout the separation distance between coal and these emerging smaller MT particles. The decrease of these MT coating on coal surface was responsible for the higher flotation recovery and better selectivity. A jump-into-contact phenomenon was observed in coal and MT interaction when MT hydrated incompletely. It showed that heterocoagulation between coal and MT occurred and MT coating on the coal surface was responsible for the depression of flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 153085
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shoulder girdle muscle activity and fatigue during automobile chassis repair
    Autorzy:
    Tian, Baozhen
    Yu, Suihuai
    Chu, Jianjie
    Li, Wenhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2161964.pdf
    Data publikacji:
    2019-07-15
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    muscle activity
    surface electromyography
    muscle fatigue
    perceived level of discomfort
    automobile chassis repair
    shoulder postures
    Opis:
    Objectives The objective of this study was to assess the postures that were commonly used in automobile chassis repair operations, and to evaluate shoulder girdle muscle fatigue for different combinations of the weight of hand-tools. Material and Methods Two right muscles, including upper trapezius (UT) and middle deltoid (MD), were selected. Surface electromyography (SEMG) and a perceived level of discomfort (PLD) were used to assess the degree of shoulder girdle fatigue. Fifteen healthy young male subjects from the Northwestern Polytechnical University participated in the test. The test consisted of assuming 4 different postures and maintaining each of them for 60 s. The 4 postures varied in terms of dumbbell weights, standing for the hand-tools weight: W1 was 0.48 kg and W2 was 0.75 kg; the 4 shoulder postures were shoulder flexions of 150°, 120°, 90°, and 60°, combined with an included elbow angle of 180°, 150°, 120° and 90°, respectively. The experimental sequences were randomly selected. The signals of SEMG and the values of PLD in the shoulder girdle were recorded in 60 s. All subjects completed the whole test. The repeated measure analysis of variance (ANOVA) was performed to ascertain differences between dumbbell weight (0.48 kg and 0.75 kg) and shoulder postures (150°/180°, 120°/150°, 90°/120° and 60°/90°). The Friedman test was utilized to determine the significant differences for UT(PLD) and MD(PLD) on shoulder postures. Spearman’s correlation was used to analyze the relationship between the subjective and objective measurements. Results Significant correlational relationships existed between the UT percentage of the maximal voluntary electrical activation (%MVE) and UT(PLD) (r = 0.459, p < 0.01), between MD(%MVE) and MD(PLD) (r = 0.821, p < 0.01). The results showed that SEMG and PLD of the 4 postures under analysis differed significantly (p < 0.05). Conclusions It was indicated that posture T4 (shoulder forward flexion 60° and included elbow angle 90°) resulted in the lowest fatigue, both in terms of the objective measure and the subjective perception, which meant that this posture was more ergonomic. Int J Occup Med Environ Health. 2019;32(4):537–52
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2019, 32, 4; 537-552
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a rapid immunochromatographic assay for detection of antibodies against porcine epidemic diarrhea virus
    Autorzy:
    Li, R.
    Ma, J.
    Tian, X.
    Yu, Y.
    Qiao, S.
    Wang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087760.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porcine epidemic diarrhea virus
    immunochromatographic test strip
    nucleocapsid protein
    diagnosis
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 139-147
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dose-effect relationship on anti-inflammatory activity on LPS induced RAW 264.7 cells and antioxidant activity of rutin in vitro
    Autorzy:
    tian, chunlian
    guo, yuru
    chang, yu
    zhao, jihang
    cui, cancan
    liu, mingchun
    Powiązania:
    https://bibliotekanauki.pl/articles/895707.pdf
    Data publikacji:
    2019-06-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    antioxidant
    Anti-inflammatory
    lipopolysaccharide
    rutin
    dose-effect relationship
    Opis:
    Rutin, as a common flavonol glycoside, exists abundantly in many plants and exhibits various nutritional and pharmacological function. Current study focused on the dose-effect relationship of rutin on the anti-inflammatory and antioxidant activities in vitro against LPS-stimulated RAW 264.7 cells and free radicals or ferric-ion. This study evaluated the anti-inflammatory activity by observation cell morphological and determination of the content of NO, TNF-α, IL-1β and IL-6, and the phagocytic activity in LPS induced RAW 264.7 cells; and revealed the antioxidant activities via assay of DPPH radical scavenging capacity, ABTS radical scavenging capacity, and reducing power. The study indicated that 5, 10, 20, 50 and 100 μM of rutin all exhibited a better anti-inflammatory activity, in especial 50 and 100 μM. Meanwhile, it exerted a stronger antioxidant activities than BHT, and equivalent to VC at the same concentration. Combined, the results suggested that rutin will be a potential and important adjuvant in treatment of inflammatory diseases and oxidative stress.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 3; 511-522
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault mode analysis and reliability optimization design of a mechanical interface based on cylindrical cam mechanisms
    Autorzy:
    Li, Jian-Hao
    Liu, Zhi-Jie
    Wang, Da-Peng
    Tian, Yun
    Zhao, Yu-Chong
    Powiązania:
    https://bibliotekanauki.pl/articles/1841922.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    mechanical interface
    fault mode analysis
    Monte Carlo simulation
    reliability design
    cylindrical cam mechanism
    Opis:
    The mechanical interface has the characteristics of low shock and vibration, and is emphasized in the aerospace and ocean engineering fields. In this paper, a mechanical interface based on coupled cylindrical cam mechanisms is designed. It can achieve the expected functions, but there exist faults in some times. The fault modes and causes of the interface are firstly analyzed. Then a design approach based on Monte Carlo simulation is presented for analyzing and optimizing its reliability. According to the fault modes, the performance functions of the interface are established for obtaining the optimal scheme. A case is given to illustrate the proposed method. The simulation results and the prototype experiments prove that the optimization scheme effectively improves the reliability of the interface, and has better performance than the original one.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 4; 715-723
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ANTI-INFLAMMATORY ACTIVITY AND CYTOTOXICITY OF DIOSGENIN ON LIPOPOLYSACCHARIDES INDUCED RAW 264.7 CELLS
    Autorzy:
    ning, jing
    chang, yu
    wang, ruxia
    lan, zhiwei
    ru, qing
    liu, mingchun
    tian, chunlian
    Powiązania:
    https://bibliotekanauki.pl/articles/895615.pdf
    Data publikacji:
    2020-04-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    Diosgenin
    Anti-inflammatory
    lipopolysaccharides
    cytotoxicity
    phagocytosis ability  
    Opis:
    Diosgenin is a steroidal sapogenin compound, and possesses multiple biological activities including anti-inflammatory, anticancer, immunological regulation, and anti-aging. The current study focused on its anti-inflammatory activities and cytotoxicity by analysis of NO production, phagocytosis activity, secretion of TNF-α and IL-6 and cell viability in LPS-induced RAW 264.7 cells. An IC50 value of diosgenin of 2.8 μM was calculated for diosgenin by regression of cell viability from concentrations ranging from 0.01 to 25 μM; this indicated that 0.01, 0.02, 0.04 μM diosgenin could reduce phagocytic activity very significantly (p<0.01) in a dose-dependent manner with no cytotoxic effect on the LPS-induced RAW 264.7 cells. However, there was no significant effect on NO content and secretion of TNF-α and IL-6 after diosgenin treatment. The research revealed that low concentrations diosgenin can directly inhibit cells phagocytosis, with no effect on the release of inflammatory mediators and cytokines. This lays a foundation for screening for a safe dose in research and developent of derivatives and new formulation of diosgenin for its anti-inflammatory effect.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 2; 313-317
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of nanofiltration membranes to concentrate and recover leached aluminum from acidified water treatment sludge
    Autorzy:
    Cheng, W. P.
    Chen, P. H.
    Tian, D. R.
    Yu, R. F.
    Fu, C. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/208030.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water purification
    nanofiltration
    acidic solutions
    leaching
    roztwory kwaśne
    oczyszczanie wody
    nanofiltracja
    ługowanie
    glin
    Opis:
    The recovery of aluminum from water purification sludge is usually performed by making the solution acidic or basic. However, for economic reasons and reasons of safety, excessive doses of acid or base should not be utilized. Accordingly, the aluminum concentration in the leached solution is typically limited, thus the recovered aluminum cannot be directly reused as a coagulant. A nanofiltration (NF) membrane can be used in the acidic solution to concentrate high-valence metal ions. There-fore, in this work, H2SO4 was utilized to leach Al3+ ions from water purification sludge. Then, the Al3+ ion solution was concentrated using a low-price NF membrane. The effect of natural organic matter on the Al3+ ion concentrating efficiency in the filtration process has been elucidated. Experimental results reveal that Al3+ ions were effectively prevented from passing through the NF membrane, enabling a highly concentrated aluminum solution to be obtained. However, the presence of organic compounds may reduce the efficiency of the concentration of Al3+ ions in the solution.
    Źródło:
    Environment Protection Engineering; 2016, 42, 3; 19-32
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantification of lower extremity physical exposures in various combinations of sit/stand time duration associated with sit-stand workstation
    Autorzy:
    Pei, Huining
    Yu, Suihuai
    Babski-Reeves, Kari
    Chu, Jianjie
    Qu, Min
    Tian, Baozhen
    Li, Wenhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2164098.pdf
    Data publikacji:
    2017-05-16
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    electromyography
    ergonomic intervention
    perceived level of discomfort
    root mean square
    body mass index
    gender differences
    Opis:
    Background Sit-stand workstations are available for office work purposes but there is a dearth of quantitative evidence to state benefits for lower limb outcomes while using them. And there are no guidelines on what constitutes appropriate sit/stand time duration. The primary aim of this study has been to compare muscle activity and perceived discomfort in the lower extremity during various combinations of sit/stand time duration associated with a sit-stand workstation separately and to evaluate the effects of the sit-stand workstation on the lower extremity during the text entry task. Material and Methods During the 5 days, all participants completed a 2-h text entry task each day for various sit/stand time duration combinations as follows: 5/25 min, 10/20 min, 15/15 min, 20/10 min, 25/5 min. Lower extremity muscular exposure of 12 male and 13 female participants was collected at 8 sites by surface electromyography and body discomfort was calculated by a questionnaire under those 5 conditions. Results Results have demonstrated that lower extremity muscle activity has been significantly varied among the 5 sit/stand time duration groups. Perceived level of discomfort (PLD) has not differed significantly for 9 out of 10 body parts. Conclusions The muscle activity of the thigh region was influenced by sit/stand time duration significantly. Ergonomic exposures of lower extremity when using a sit-stand workstation were increased, particularly during the long time standing posture. Results indicate that body mass index (BMI) and gender were not significant factors in this study. Combination of sit/stand time duration 25/5 min appears to show positive effects on relief of muscle exposure of back of thigh in the shifts of sitting and standing work position. Med Pr 2017;68(3):315–327
    Źródło:
    Medycyna Pracy; 2017, 68, 3; 315-327
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error analysis of the three-phase electrical energy calculation method in the case of voltage-loss failure
    Autorzy:
    Cheng, Han-miao
    Wang, Zhong-dong
    Cai, Qi-xin
    Lu, Xiao-quan
    Gao, Yu-xiang
    Song, Rui-peng
    Tian, Zheng-qi
    Mu, Xiao-xing
    Powiązania:
    https://bibliotekanauki.pl/articles/221096.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-phase electrical energy meter
    voltage-loss failure
    voltage substitution
    three-phase voltage unbalance
    calculation error
    Opis:
    The single-phase voltage loss is a common fault. Once the voltage-loss failure occurs, the amount of electrical energy will not be measured, but it is to be calculated so as to protect the interest of the power supplier. Two automatic calculation methods, the power substitution and the voltage substitution, are introduced in this paper. Considering the lack of quantitative analysis of the calculation error of the voltage substitution method, the grid traversal method and MATLAB tool are applied to solve the problem. The theoretical analysis indicates that the calculation error is closely related to the voltage unbalance factor and the power factor, and the maximum calculation error is about 6% when the power system operates normally. To verify the theoretical analysis, two three-phase electrical energy metering devices have been developed, and verification tests have been carried out in both the lab and field conditions. The lab testing results are consistent with the theoretical ones, and the field testing results show that the calculation errors are generally below 0.2%, that is correct in most cases.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 505-516
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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