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    Wyświetlanie 1-12 z 12
    Tytuł:
    Simultaneous removal of phenol and Cu(II) from wastewater by tallow dihydroxyethyl betaine modified bentonite
    Autorzy:
    Hu, Xiangyang
    Wang, Bao
    Yan, Gengsheng
    Ge, Bizhou
    Powiązania:
    https://bibliotekanauki.pl/articles/2203123.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    simultaneous adsorption
    tallow dihydroxyethyl betaine
    bentonite
    Cu(II)
    phenol
    Opis:
    An organobentonite modified with an amphoteric surfactant, tallow dihydroxyethyl betaine (TDHEB), was used as an adsorbent to simultaneously remove Cu(II) and phenol from wastewater. The characteristic of the organobentonite (named TDHEB-bentonite) was analyzed by X-ray diffraction, Fourier-transform infrared spectra and nitrogen adsorption-desorption isotherm. Batch tests were conducted to evaluate the adsorption capacities of TDHEB-bentonite for the two contaminants. Experiment results demonstrated that the adsorption of both contaminants is highly pH-dependent under acidic conditions. TDHEB-bentonite had about 2.0 and 5.0 times higher adsorption capacity toward Cu(II) and phenol, respectively, relative to the corresponding raw Na-bentonite. Adsorption isotherm data showed that the adsorption processes of both contaminants were well described by Freundlich model. Kinetic experiment demonstrated that both contaminants adsorption processes correlated well with pseudo-second-order model. Cu(II) had a negative impact on phenol adsorption, but not vice versa. Cu(II) was removed mainly through chelating with the organic groups (-CH2CH2OH and -COO-) of TDHEB. Otherwise, partition into the organic phase derived from the adsorbed surfactant was the primarily mechanism for phenol removal. Overall, TDHEB-bentonite was a promising adsorbent for removing Cu(II) and phenol simultaneously from wastewater.
    Źródło:
    Archives of Environmental Protection; 2022, 48, 3; 37--47
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium time-of-flight Measurements of Mesoporous Silica Films
    Autorzy:
    Kuang, Peng
    Zhang, Xiao
    He, Chun
    Cao, Xing
    Wang, Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/1029796.pdf
    Data publikacji:
    2018-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.05.-a
    68.47.Mn
    Opis:
    Mesoporous silica films were synthesized with various concentrations of cetyltrimethylammonium bromide (CTAB) in precursor sols through the method of electro-assisted self-assembly (EASA). Oriented pore channels were observed in the films prepared with more CTAB in the precursor sols. Positronium time-of-flight (Ps-TOF) measurements were performed for the silica films with different porous structures. It is demonstrated that the Ps emission intensity and energies are well correlated to the apparent porosity, pore interconnectivity and possibly pore channel orientation. The results indicate that Ps-TOF can be a useful technique for probing the structures of porous films.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 1; 3-6
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of NaCl Additive on the Reduction Process of MoO3 to Mo2C by High-Purity CO Gas
    Autorzy:
    Que, Biao-Hua
    Wang, Lu
    Wang, Bao
    Chen, Yi
    Xue, Zheng-Liang
    Powiązania:
    https://bibliotekanauki.pl/articles/2106609.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mo2C
    MoO3
    CO
    NaCl
    Opis:
    In this work, influence of NaCl additive on the transformation process of MoO3 to Mo2C under pure CO atmosphere in the range of room temperature to 1170 K was investigated. The results showed that transformation of MoO3 to Mo2C can be roughly divided into two stages: the reduction of MoO3 to MoO2 (the first stage) and the carburization of MoO2 to Mo2C (the second stage). As to the first stage, it was found that increasing the content of NaCl (from 0 to 0.5 wt.%) was beneficial for the increase of reaction rate due to the nucleation effect; while when the content of NaCl increased to 2 wt.%, the reaction rate will be decreased in turn. As to the second stage, the results showed that reaction rate was decreased with the increase of NaCl, which may be due to the formation of low-melting point eutectic. The work also found that morphology of as-prepared Mo2C was irregular and particle size of it was gradually increased with increasing the NaCl content. According to the results, the possible reaction mechanism was proposed.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 787--796
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comprehensive Analysis of Metal Deformation Law Based on Numerical Simulation of Cold Rolling Process
    Autorzy:
    Yan, Zhu-Wen
    Wang, Bao-Sheng
    Bu, He-Nan
    Li, Hao
    Hong, Lei
    Zhang, Dian-Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/2106570.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3D elastic-plastic FEM
    work roll deflection
    lateral thickness
    flatness regulation effect
    rolling pressure
    Opis:
    Through taking the cold rolling process as the research object, the three-dimensional finite element model of the strip rolling process is established by using ANSYS/LS-DYNA software. The actual rolling product data has strong consistency with the finite element simulation results. The rolling process is dynamically simulated, and the distribution curves of important rolling parameters such as equivalent stress, control efficiency coefficient, transverse rolling pressure, lateral thickness and work roll deflection is obtained. Based on summarizing the influence of rolling parameters on rolling deformation, the research results of this paper can play an important role in the actual rolling process control. The research results have certain guiding significance for the development and optimization of the rolling control system.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 623--635
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of soil settlement prediction and its application in large-scale marine reclamation artificial island project
    Autorzy:
    Zhao, J.
    Bao, L.
    Wang, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/259183.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    microstructure
    consolidation
    creep
    artificial island
    settlement
    Opis:
    In an artificial island construction project based on the large-scale marine reclamation land, the soil settlement is a key to affect the late safe operation of the whole field. To analyze the factors of the soil settlement in a marine reclamation project, the SEM method in the soil micro-structural analysis method is used to test and study six soil samples such as the representative silt, mucky silty clay, silty clay and clay in the area. The structural characteristics that affect the soil settlement are obtained by observing the SEM charts at different depths. By combining numerical calculation method of Terzaghi’s one-dimensional and Biot’s two-dimensional consolidation theory, the one-dimensional and two-dimensional creep models are established and the numerical calculation results of two consolidation theories are compared in order to predict the maximum settlement of the soils 100 years after completion. The analysis results indicate that the micro-structural characteristics are the essential factor to affect the settlement in this area. Based on numerical analysis of one-dimensional and two-dimensional settlement, the settlement law and trend obtained by two numerical analysis method is similar. The analysis of this paper can provide reference and guidance to the project related to the marine reclamation land.
    Źródło:
    Polish Maritime Research; 2017, S 3; 4-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental Aspects of the European Experience in Landscape Planning
    Środowiskowe aspekty europejskiego doświadczenia w architekturze krajobrazu
    Autorzy:
    Yu, Bao
    Wang, Jianmei
    Li, Ya
    Powiązania:
    https://bibliotekanauki.pl/articles/2080933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
    Tematy:
    landscape
    natural areas
    landscape planning
    ecology
    environmental protection
    krajobraz
    obszary naturalne
    architektura krajobrazu
    ekologia
    ochrona środowiska
    Opis:
    Understanding all the possibilities of environmentally oriented landscape planning will contribute to the effective environmental planning of the territory and nature management in general. Accordingly, the purpose of the study was to investigate the experience of the European countries towards the introduction of an effective system of environmentally oriented landscape planning and improvement of territories, as well as their protection. For this purpose, it is necessary to comprehensively study the strengths and weaknesses of existing developments in the field of environmentally oriented landscape planning in Europe. An analysis of the best practices of environmentally oriented landscape planning in such countries as Great Britain, France, Germany, the Netherlands, etc. has been conducted. The findings allowed to state that the effectiveness of development and implementation of substantial planning for landscape design depends not only on the volume and depth of research, but to a very large extent from their reasonable and productive organisation. The paper summarises that in environmentally oriented landscape planning, it is first necessary to determine the reasons for planning. Before choosing the object and territory of planning, it is necessary to find out: who are the potential customers and investors – their goals and motivation; what are the problem situations and conflicts in nature management in the area; what is the practical use of the results of landscape planning; the purpose of the territory, including cartographic; the availability of source information, and more. And then make decisions regarding the stages of landscape planning, taking into account the environmental component and, accordingly, the implementation of the idea of landscape planning.
    Zrozumienie wszystkich aspektów architektury krajobrazu zorientowanej na środowisko przyczyni się do efektywnego planowania środowiskowego terytorium i ogólnie do zarządzania przyrodą. W związku z tym celem badania było zbadanie doświadczeń krajów europejskich w zakresie wprowadzenia efektywnego systemu architektury krajobrazu zorientowanej na środowisko i poprawy obszarów, a także ich ochrony. W tym celu konieczne jest kompleksowe zbadanie mocnych i słabych stron istniejących rozwiązań w dziedzinie architektury krajobrazu zorientowanej na środowisko. Przeprowadzono analizę najlepszych praktyk architektury krajobrazu w takich krajach jak Wielka Brytania, Francja, Niemcy i Holandia. Wyniki pozwoliły stwierdzić, że skuteczność opracowania i wdrożenia planowania merytorycznego do projektowania krajobrazu zależy nie tylko od zakresu i głębokości badań, ale w bardzo dużym stopniu od ich racjonalnej organizacji. Stwierdzono, że w planowaniu krajobrazu zorientowanego na środowisko najpierw należy określić przyczyny planowania. Przed wyborem przedmiotu i terenu planowania należy dowiedzieć się: kim są potencjalni klienci i inwestorzy – ich cele i motywacja; jakie są sytuacje problemowe i konflikty w zarządzaniu przyrodą na danym terenie; jakie jest praktyczne wykorzystanie wyników planowania krajobrazu; cel terytorium, w tym opis kartograficzny; dostępność informacji źródłowych itp. Następnie należy podjąć decyzje dotyczące etapów planowania krajobrazowego z uwzględnieniem komponentu środowiskowego w celu odpowiedniej realizacji idei architektury krajobrazu.
    Źródło:
    Problemy Ekorozwoju; 2022, 17, 1; 301--309
    1895-6912
    Pojawia się w:
    Problemy Ekorozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of quaternary ammonium salt hydrophobic modifiers on the α-quartz (001) surface: a density functional theory study
    Autorzy:
    Liu, Chunfu
    Wang, Weitao
    Wang, Han
    Zhu, Chenyu
    Ren, Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/24085768.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    α-quartz (001) surface
    quaternary ammonium salt
    density functional theory
    adsorption mechanism
    Opis:
    To investigate the adsorption mechanism of quaternary ammonium salt on the α-quartz (001) surface, the adsorption models of hydrophobic modifiers 1231, 1431, 1631 and 1831 were constructed and simulated using the density functional theory (DFT). Results indicate that the adsorption energy of quaternary ammonium salt increases with the increase of carbon chain length, and the adsorption en-ergy reaches the maximum at 18 carbon atoms; however, the adsorption capacity of 1631 is weak owing to the carbon chain deflection. Based on the Mulliken bond population analysis, reagent 1831 has the strongest interaction with α-quartz (001) surface compared with 1231, 1431 and 1631; and during the adsorption process, charge transfer and electrostatic attraction occur between the reagent and α-quartz (001) surface with similar degrees of charge transfer observed. This study emphasizes that electrostatic attraction plays a key role in the adsorption process, while the week hydrogen bonding plays a second-ary role.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170260
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of force in single cable plane prestressed concrete polygonal line tower cable-stayed bridge based on minimum bending energy
    Autorzy:
    Li, Yanfeng
    Guo, Tianyu
    Bao, Longsheng
    Wang, Fuchun
    Powiązania:
    https://bibliotekanauki.pl/articles/1852393.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The cable force of a cable-stayed bridge plays a vital role in its internal force state. Different cable forces on both sides of the main tower make the force characteristics of the polygonal-line tower quite different from those of the straight-line tower. Therefore, the determination of the cable force of the polygonal-line tower cable-stayed bridge is a crucial aspect of any evaluation of its mechanical characteristics. A single-cable plane prestressed concrete broken-line tower cable-stayed bridge is taken as a case study to conduct a model test and theoretical cable force determination. The reasonable cable force of the bridge is determined by the minimum bending energy method combined with false load and internal force balance methods. analysis includes a comparison between cable force calculation results, model test results, and the design value of the actual bridge. The distribution law of the dead load cable force of the completed bridge is determined accordingly.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 565-579
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shrinkage Porosity Criterion and Its Application to A 5.5 Ton Steel Ingot
    Autorzy:
    Zhang, C.
    Bao, Y.
    Wang, M.
    Zhang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/382021.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    quality management
    shrinkage porosity
    ingot solidification
    application of information technology
    numerical simulation
    przemysł odlewniczy
    zarządzanie jakością
    porowatość
    krzepnięcie
    zastosowanie technologii informatycznych
    symulacja numeryczna
    Opis:
    In order to predict the distribution of shrinkage porosity in steel ingot efficiently and accurately, a criterion R√L and a method to obtain its threshold value were proposed. The criterion R√L was derived based on the solidification characteristics of steel ingot and pressure gradient in the mushy zone, in which the physical properties, the thermal parameters, the structure of the mushy zone and the secondary dendrite arm spacing were all taken into consideration. The threshold value of the criterion R√L was obtained with combination of numerical simulation of ingot solidification and total solidification shrinkage rate. Prediction of the shrinkage porosity in a 5.5 ton ingot of 2Cr13 steel with criterion R√L>0.21 m･℃1/2･s-3/2 agreed well with the results of experimental sectioning. Based on this criterion, optimization of the ingot was carried out by decreasing the height-to-diameter ratio and increasing the taper, which successfully eliminated the centreline porosity and further proved the applicability of this criterion.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 27-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and theoretical research on spatial shear lag effect of self-anchored suspension bridge steel box girder
    Autorzy:
    Li, Yanfeng
    He, Ying
    Bao, Longsheng
    Sun, Baoyun
    Wang, Qinghe
    Powiązania:
    https://bibliotekanauki.pl/articles/1852505.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    most samozakotwiony
    most wiszący
    dźwigar skrzynkowy
    dźwigar stalowy
    efekt opóźnienia ścinania
    analiza elementów skończonych
    self-anchored bridge
    suspension bridge
    steel box girder
    shear lag effect
    finite element analysis
    Opis:
    The shear lag effect of the steel box girder section in a self-anchored suspension bridge was investigated in this study. Finite element analysis software Midas Civil was used to discretize the girder under analysis into space plate elements and establish a plate element model. The law of shear lag in the longitudinal direction of the girder in the construction and completion stages was determined accordingly. The shear lag coefficient appears to change suddenly near the side support, middle support, side cable anchorage area, and near the bridge tower support of the steel box girder under the imposed load. The most severe shear lag effect is located near the side support and near the side cable anchorage area. Steel box girder sections are simulated before and after system conversion to analyze the shear lag coefficient in the bridge construction stage. The results show that the shear lag coefficient markedly differs before versus after system conversion due to the different stress mechanisms. The finite element analysis results were validated by comparison with the results of an analysis via analogous rod method.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 631-651
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of porcine epidemic diarrhea virus infection on Toll-like receptor expression and cytokine levels in porcine intestinal epithelial cells
    Autorzy:
    Wang, F.
    Wang, S.Q.
    Wang, H.F.
    Wu, Z.C.
    Bao, W.B.
    Wu, S.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087351.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pig
    porcine epidemic diarrhea virus
    TLRs
    innate immunity
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 1; 119-126
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separation and physicochemical properties of residual carbon in gasification slag
    Autorzy:
    Fan, Xiaoting
    Fan, Panpan
    Liu, Xiaodong
    Ren, Zhenyang
    Bao, Weiren
    Wang, Jiancheng
    Dong, Lianping
    Fan, Minqiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2175447.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    waste treatment
    gasification slag
    physical properties
    chemical properties
    structural features
    reaction kinetics
    Opis:
    Gasification slag is the solid waste produced in the coal gasification process, and its treatment and disposal problems are becoming more and more serious. In this study, the gasification slag produced in a chemical base in northern China and its residual carbon obtained by gravity separation of water medium were taken as the research objects, and their physicochemical properties were analyzed comprehensively. The residual carbon products, ash-rich products and high-ash products were obtained from the gasification slag after gravity separation. Under the optimal structure, the ignition loss of residual carbon products was reduced from 79.80% to 16.84%, and the yield was 11.64%. The high content of amorphous carbon and developed pores in the residual carbon provide the possibility of manufacturing high value-added materials. Raman spectrum showed that the residual carbon had lower aromaticity, higher content of small and medium aromatic ring structures, lower structural stability and easier combustion. Thermogravimetric combustion kinetics showed that the average combustion rate of residual carbon was 0.325(dm/dt)mean/%•min−1, the comprehensive combustion characteristic index was 1.41•10−9%2•min−2•°C−3. It has excellent performance and can be used as a raw material for mixed combustion in a circulating fluidized bed. The analysis of physical and chemical properties of residual carbon is of great significance for follow-up exploration of the resource utilization and high-value utilization of the residual carbon.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154928
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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