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Wyszukujesz frazę "Shi, Qing" wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Effect of depressants in the selective flotation of smithsonite and calcite using potassium lauryl phosphate as collector
Autorzy:
Sun, Qing
Feng, Qiming
Shi, Qing
Powiązania:
https://bibliotekanauki.pl/articles/110635.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
smithsonite
calcite
flotation
depressant
separation
Opis:
In order to selectively separate smithsonite and calcite using potassium lauryl phosphate as collector and reveal the depression mechanism, the approaches of micro-flotation and zeta potential measurements were adopted. The effects of sodium hexametaphosphate (SHMP), water glass (WG), carboxymethyl cellulose (CMC) and lignosulfonate calcium (LSC) as depressants on smithsonite and calcite have been studied through micro-flotation. The single mineral flotation tests show that LSC can depress calcite, but it has little effect on smithsonite flotation. Flotation separation of a mixture of smithsonite and calcite can be completed to obtain a zinc concentrate grade up to 33.85% Zn with a recovery of 70.06%. The zeta potential results illustrate that LSC has higher tendency to be adsorbed on the surface of calcite. However, there is little adsorption of LSC on smithsonite.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 89-96
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of $Ca{2+}$ and $SO_4^{2-}$ ions on fluorite flotation
Autorzy:
Xun, Luobing
Hu, Jiacheng
Shi, Qing
Zhang, Guofan
Powiązania:
https://bibliotekanauki.pl/articles/1448205.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorite
flotation
calcium cation
sulphate anion
Opis:
The effects of $Ca^{2+}$ and $SO_4^{2-}$ on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of $SO_4^{2-}$ and $Ca^{2+}$ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of $SO_4^{2-}$ on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more $SO_4^{2-}$ are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 2; 95-104
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of N-carboxymethyl chitosan as a selective depressant for talc in flotation of chalcopyrite
Autorzy:
Liu, Cheng
Feng, Qiming
Shi, Qing
Zhang, Wencai
Song, Shaoxian
Powiązania:
https://bibliotekanauki.pl/articles/110512.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
talc
flotation separation
N-carboxymethyl chitosan
Opis:
Flotation separation of chalcopyrite from talc is difficult because of the natural hydrophobicity of two minerals. In this work, the flotation separation of chalcopyrite from talc using N-carboxymethyl chitosan as a depressant for talc was studied. The micro-flotation results indicated that the flotation separation of chalcopyrite from talc cannot be realized effectively at pH 9 with low concentration of N-carboxymethyl chitosan, in the presence of calcium ions, talc was more efficiently depressed by N-carboxymethyl chitosan, while the chalcopyrite recovery was not influenced. Contact angle, zeta potential and adsorption results showed that Ca2+ and CaOH+ absorbed on the talc surface and increased the absorption amount of N-carboxymethyl chitosan on the mineral surface, and increased hydrophilicity of talc surface, resulting the selective depression for talc in chalcopyrite flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 108-115
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Single-Photon Router in Quantum Fluctuation of Field
Autorzy:
Liu, Li-Wei
Shi, Yu-Qing
Qiong, Chen
Powiązania:
https://bibliotekanauki.pl/articles/1032595.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
single-photon quantum router
Bose-Einstein condensate
cavity optomechanical
Opis:
We investigate a single-photon quantum router in quantum fluctuation of fields. The optomechanical system composed of a cigar-shaped Bose-Einstein condensate trapped in an ultrahigh-finesse Fabry-Pérot cavity. We show how an analog of electromagnetically induced transparency in an optomechanical system can be used to produce a switch for a quantum fluctuation field using very low pumping field strength. The numerical results show that the output photon is completely different by turning the pump off and turning the pump on. We also show that the quantum noise sources are very small. This optomechanical system can serve as a single-photon quantum router.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1358-1362
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-year follow-up of post-traumatic stress disorder symptoms in healthcare workers after the COVID-19 pandemic in China
Autorzy:
Chen, Hao
Ma, Qing
Du, Bo
Huang, Yan
Zhu, Shi-Guang
Powiązania:
https://bibliotekanauki.pl/articles/21375409.pdf
Data publikacji:
2023-09-07
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
COVID-19
work stress
healthcare workers
psychological resilience
post-trauma stress disorders
job risk
Opis:
Objectives: This study aimed to conduct a 2-year follow-up of mental disorders in healthcare workers (HCWs) in a region of China outside the epidemic’s core zone who happened to be directly or possibly exposed to persons with COVID-19. Material and Methods: A cognitive analysis scale was utilized in the evaluation the mental or emotional state of HCWs at Xuzhou Medical University’s affiliated hospital in the city of Xuzhou, China (a non-core epidemic area) 2 years after the first assessment during the COVID-19 pandemic. A total of 165 HCWs were selected as the study subjects. In accordance to the exposure risk of COVID-19 patients, the subjects were separated into 2 categories: a group with a high risk HCW (HHCW) (HCWs working in COVID-19-positive wards; N = 91) and a group with a minimal risk HCW (LHCW) (HCWs who worked in wards without COVID-19 patients at the same hospital; N = 75). The clinical as well as demographic information of every HCWs were collected. Results: The demographic data revealed significant differences in terms of occupation, remuneration, and selfless concerns amidst both categories (p < 0.05). There lacked a statistically notable difference in the occurrence of PTSD between the 2 groups. Data was analyzed for factors associated with PTSD, and the results showed that psychological resilience, job risk, and stress in the workplace were risk factors for PTSD. Additionally, the results of the logistic regression analysis showed that psychological resilience was a significant shared risk factor for PTSD in HCWs after the COVID-19 pandemic. Conclusions: The 2-year follow-up showed no statistical difference in the incidence of PTSD between the HHCW group and the LHCW group. Workplace stress, occupational hazards, and psychological resilience were the major contributing risk factors for PTSD in HCWs.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 3; 324-332
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterized Microstructure and Electrical Properties of Hydrogenated Nanocrystalline Silicon Films by Raman and Electrical Conductivity Spectra
Autorzy:
Xiao-Yong, Gao
Jian-Tao, Zhao
Yu-Fen, Liu
Qing-Geng, Lin
Yong-Sheng, Chen
Jin-Hua, Gu
Shi-E, Yang
Jing-Xiao, Lu
Powiązania:
https://bibliotekanauki.pl/articles/1808127.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Cq
73.61.-r
Opis:
Microstructure and electrical properties of hydrogenated nanocrystalline silicon (nc-Si:H) film deposited on glass substrate at low temperature were characterized by average grain size, crystallinity, and dark electrical conductivity data obtained from the Raman and electrical conductivity spectroscopy, respectively. The average grain size, crystallinity and electrical conductivity have a similar change with substrate temperature. A threshold substrate temperature determined by silane concentration appears in their corresponding spectroscopy vs. substrate temperature. The dependence of crystallinity, average grain size and electrical conductivity on substrate temperature were accounted for by surface diffusion model and heterojunction quantum dot model, respectively.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 738-741
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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