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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effects of single and mixed reagent systems on improved diaspore recovery
    Autorzy:
    Jiang, Hao
    Xiang, Guoyuan
    Gao, Ya
    Khoso, Sultan Ahmed
    Peng, Weiwen
    Powiązania:
    https://bibliotekanauki.pl/articles/110867.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diaspore
    flotation
    mixed collector
    froth stability
    adsorption
    Opis:
    Frothing performance and stability of sodium oleate (NaOL) alone and in presence of methyl isobutyl methanol (MIBC), octanol (OCT) and polyethylene glycol (PEG) systems were studied and compared in order to enhance flotation separation of diasporic bauxite ore. Performance of a single (NaOL) and mixed systems (NaOL-MIBC, NaOL-OCT, NaOL-PEG) was evaluated through flotation tests, three-phase dynamic froth stability tests, zeta potential measurements and adsorption analysis. The mixed systems showed a stable froth and an improved recovery with their descending order NaOLPEG˃NaOL-OCT ˃ NaOL-MIBC. Adsorption analysis and zeta potential measurements suggested that, except NaOL adsorption, there was no significant co-adsorption of alcohols on the diaspore surface. However, adsorbed amount of NaOL on the diaspore surface was extremely high; accounts for more than 90% of the total substance used in the pulp.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1179-1191
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Preheating Temperature on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-Gel Spin Coating Technique
    Autorzy:
    Ji, Qiang-min
    Wang, Ya-li
    Gao, Xiao-yong
    Gao, Hui
    Zhai, Yao-fei
    Powiązania:
    https://bibliotekanauki.pl/articles/1398971.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.55.-m
    Opis:
    Highly-oriented ZnO thin films prepared by using low-cost technique such as sol-gel technique are of much importance to ZnO-based white light-emitting diodes. The chose of proper preheating temperature in sol-gel technique is still critical for highly-oriented ZnO thin film so far. The mechanisms for the preheating in the formation of ZnO thin film and for the reactions involved in the sol solution have not been clearly stated yet. Thus, in this work, the highly-oriented ZnO thin films were prepared on glass substrates by using sol-gel spin-coating technique. The sol solution was prepared by using the two-step method rather than usual one-step method, which facilitates the understanding of the mechanism for the reactions involved in the sol solution. The effect of the preheating temperature on the microstructure and the optical properties of the films were in particular investigated. The mechanisms for the preheating in the formation of the films and for the reactions involved in the sol solution prepared by the two-step method were also proposed in terms of the experimental results. The preheating not only enhances the volatilization of the solvent 2-methoxyethanol and the decomposition of the residual organic species, but also results into the formation of small number of ZnO particles. The preheating temperature of 300°C is most favorable for the highly-oriented ZnO thin film. Increasing the preheating temperature results into the blue shift of the absorption edges of the films. This can be explained by using the quantum-size effect. The photoluminescence spectra of the films show an UV emission at the near-band edge and a broad green-yellow emission at 470-620 nm. The former is closely related to the excitons, while the latter is to the intrinsic defect species in the film.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1191-1196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of nitrogen on growth parameters and photosynthetic characteristics of P. chinense Schneid. Seedlings in three soil types
    Autorzy:
    Wang, Meng-ying
    Wang, Ya-juan
    Ren, Hong-yu
    Yang, Yao
    Gu, Tao
    He, Jing-wen
    Gao, Shun
    Powiązania:
    https://bibliotekanauki.pl/articles/53893751.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Soil type and nitrogen (N) are two important factors affecting plant growth and development, and photosynthetic physiological characteristics. However, there are still relatively few studies on the effects of N on P. chinense Schneid. seedlings under different types of soils. In this study, three soil types (red soil, alkaline purple soil, and acidic purple soil) and three N levels (50, 150 and 300 mg/plant) were used to investigate how N levels affected seedling growth, biomass accumulation distribution and photosynthetic characteristics under three soil types. The results showed that N may promote the growth of these seedlings and increase their height and basal stem under three soil types. The stem and leaf biomass, aerial biomass, total biomass, and rootshoot ratio showed significant differences. N increased chlorophyll content in leaves on alkaline purple soil and acidic purple soil, but inhibited chlorophyll synthesis on red soil. Under the same N application, the order for total biomass accumulation in seedlings was alkaline purple soil, red soil, and acid purple soil; for the net photosynthetic rate, it was red soil, acid purple soil, and alkaline purple soil. These results indicate that leaves might elevate the photosynthetic rate by increasing stomatal conductance, intercellular CO2 concentration, and transpiration rate, thereby promoting the growth of seedlings. In addition, soil type and nitrogen had a significant interaction effect on the growth and photosynthetic characteristics of P. chinense Schneid. seedlings. These findings will help screening for suitable soil types and nitrogen application levels for efficient cultivation of P. chinense Schneid. seedlings.
    Źródło:
    Journal of Elementology; 2023, 28, 2; 279-294
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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