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Wyszukujesz frazę "Tian, W." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    A Coupled Smoothed Finite Element-Boundary Element Method for Structural-Acoustic Analysis of Shell
    Autorzy:
    Tian, W.
    Yao, L.
    Li, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/177260.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SFEM
    smoothed finite element method
    FEM
    finite element method
    BEM
    boundary element method
    structural-acoustic analysis
    Opis:
    Nowadays, the finite element method (FEM) – boundary element method (BEM) is used to predict the performance of structural-acoustic problem, i.e. the frequency response analysis, modal analysis. The accuracy of conventional FEM/BEM for structural-acoustic problems strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high frequency problem is also clear. In order to improve the accuracy of structural-acoustic problem, a smoothed finite-element/boundary-element coupling procedure (SFEM/BEM) is extended to analyze the structural-acoustic problem consisting of a shell structure interacting with the cavity in this paper, in which the SFEM and boundary element method (BEM) models are used to simulate the structure and the fluid, respectively. The governing equations of the structural-acoustic problems are established by coupling the SFEM for the structure and the BEM for the fluid. The solutions of SFEM are often found to be much more accurate than those of the FEM model. Based on its attractive features, it was decided in the present work to extend SFEM further for use in structural-acoustic analysis by coupling it with BEM, the present SFEM/BEM is implemented to predict the vehicle structure-acoustic frequency response analysis, and two numerical experiments results show that the present method can provide more accurate results compared with the standard FEM/BEM using the same mesh. It indicates that the present SFEM/BEM can be widely applied to solving many engineering noise, vibration and harshness (NVH) problems with more accurate solutions.
    Źródło:
    Archives of Acoustics; 2017, 42, 1; 49-59
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free chlorine loss during spraying of membraneless acidic electrolyzed water and its antimicrobial effect on airborne bacteria from poultry house
    Autorzy:
    Zhao, Y.
    Xin, H.
    Zhao, D.
    Zheng, W.
    Tian, W.
    Ma, H.
    Liu, K.
    Hu, H.
    Wang, T.
    Soupir, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49243.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for improving sinusoidal quality of error diffusion binary encoded fringe used in phase measurement profilometry
    Autorzy:
    Tian, Z.
    Chen, W.
    Su, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174421.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phase measurement profilometry
    digital-light-processing projector
    DLP projector
    error diffusion algorithm
    binary encoded grating
    Opis:
    Insufficient resolution of digital-light-processing projector will degrade the sinusoidal quality of the binary encoded fringe pattern because of less sampling points in a fringe period, which will degrade the measurement accuracy if it is used in phase measurement profilometry. Two resolutions are proposed in the paper. One is that a cylindrical lens is introduced in the projecting light path of the measurement system to improve sinusoidal quality of the binary encoded fringe by elliptical low-pass filtering of the system. The other one is that superposition of multi-frame binary encoded gratings with different microstructure is to reduce the binary image noise for improving the measurement accuracy. Simulations and experiments verify the validity of the above two methods.
    Źródło:
    Optica Applicata; 2016, 46, 2; 291-303
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytic Equation of State and Thermodynamic Properties, for α-, β-, and γ-Si₃N₄ Based on Analytic Mean Field Approach
    Autorzy:
    Wang, L.
    Sun, J.
    Yang, W.
    Tian, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812044.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.10.+h
    65.40.-b
    61.66.Fn
    Opis:
    The analytic mean field potential approach is applied to α-, β-, and γ-Si₃N₄. The analytic expressions for the Helmholtz free energy, internal energy, and equation of state were derived. The formalism for the case of the Morse potential is used in this work. Its six potential parameters are determined through fitting the compression experimental data of α-, β-, and γ-Si₃N₄. The calculated compression curves of α-, β-, and γ-Si₃N₄ are in good agreement with the available experimental data. This suggests that the analytic mean field potential approach is a very useful approach to study the thermodynamic properties of Si₃N₄. Furthermore, we predict the variation of the free energy and internal energy with the molar volume at several higher temperatures and calculate the temperature dependence of the molar volume, bulk modulus, thermal expansion coefficient and isochoric heat capacity at zero pressure.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 807-818
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of accuracy of simple methods for design and analysis of a blazed phase grating microstructure
    Autorzy:
    Wang, W.
    Jing, X.
    Zhao, J.
    Li, Y.
    Tian, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/173533.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    grating
    effective medium theory
    scalar diffraction theory
    Opis:
    In order to precisely analyze and design the transmittance characteristics of a blazed grating, the validity of both the scalar diffraction theory and the effective medium theory is quantitatively demonstrated. By making a comparison of diffraction efficiencies calculated by the two simplified methods and Fourier modal method, the accuracy can be obtained. It is found that when the normalized period is more than three wavelengths of the incident light, the scalar diffraction theory is useful to calculate the transmittance of the blazed grating within the error of less than 3%. The validity of the scalar diffraction theory increases when the normalized period increases. Importantly, by considering the Fresnel reflection effect, the validity of scalar diffraction theory can be significantly enhanced. Furthermore, when no higher-order diffraction waves appear and only zeroth order diffraction wave propagates, the effective medium theory is accurate to compute the diffraction efficiency within the difference of less than 1% between the zeroth order effective medium theory and Fourier modal method. The polarization characteristics of the validity of effective medium theory are also quantitatively demonstrated. The validity of the two simplified theories is dependent on not only the normalized period of surface microstructure but also the normalized groove depth.
    Źródło:
    Optica Applicata; 2017, 47, 2; 183-198
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography
    Autorzy:
    Dai, B.
    Lan, L.-G.
    Zhang, W.-B.
    Tian, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358613.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    technology of materials
    testing and analysis
    compression molding
    polymer bonded explosive
    stress state
    strain ellipsoid
    X-ray tomography
    Opis:
    Precise measurement of the inner structural strain of polymer bonded explosive (PBXs) granules during compression molding is highly desirable in order to investigate the inner stress distribution field and its underlying generation mechanism, with the aim of improving the stress distribution uniformity. In this contribution, TATB-based (1,3,5-triamino-2,4,6-trinitrobenzene) PBX granules were formulated and the stress-strain state of the PBX granules during the warm molding process was analyzed. Strain markers were implanted at different locations and the deformation characteristics and regularity of the embedded spherical strain markers were obtained by X-ray micro-tomography. Thus the local strain states at different locations could be obtained, and the local stress state could be deduced. The results showed that axisymmetric deformation occurred in all of the strain markers, where the flat strain ellipsoids were mainly compressed uni-axially. In the central region, the stress was mainly in an axial direction, and the shear force was small. Not only axial stresses, but also large shear stresses in the surrounding region of the cylindrical grains were present. The stress gradient in the central region was greater than that in the surrounding region. The stress was greater in the surrounding region because this region was squeezed by the mold. The maximum strain degree was 44.8% larger than the minimum strain degree. The local stress increment in each region was quantified. The stress increments of the three axes were in the range 14.2-19.5 MPa. This study examined the feasibility of evaluating the inner stress–strain state of PBX granules in a quantitative manner, which is significant in determining the inner strain and stress distribution in PBX granules during the molding process.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 3; 688-707
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption efficiency of pentafluorobenzene on ionic liquids-based silicas
    Autorzy:
    Wang, X.
    Lin, L.
    Xie, J.
    Yan, X.
    Xiao, W.
    Tian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/778559.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ionic liquids based silica
    pentafl uorobenzene
    adsorption
    solid-phase extraction
    Opis:
    The adsorption of pentafl uorobenzene on nine ionic liquid-based silicas was investigated using solid phase extraction. The effects of several variables such as the type of ionic liquid groups, adsorption time, temperatures and water ratio in the solution system were experimentally evaluated. The imidazole-chloride ionic liquid group based silica exhibited the highest adsorption efficiency under the optimized conditions of 5 min adsorption at 30°C in water/methanol (30:70, vol%) solution. In addition, the effects of pH, as well as type and concentrations of chloride salts were investigated. At pH values other than neutral and high salt concentration, the adsorption efficiency was reduced. Finally, the relative standard deviation of less than 5.8% over a 5-day period showed a high precision for the nine tested sorbents.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 3; 47-52
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    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:
    Discoloration of Cotton/Kapok Indigo Denim Fabric by Using a Carbon Dioxide Laser
    Odbarwianie tkanin typu denim z mieszanek bawełny i kapoku poprzez zastosowanie lasera
    Autorzy:
    Du, W.
    Gosh, R. C.
    Zuo, D.-Y.
    Zou, H.-T.
    Tian, L.
    Yi, C.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/949450.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    kapok fibre
    denim fabric
    laser treatment
    colour-fading
    air permeability
    włókna kapok
    tkaniny denim
    obróbka laserowa
    przepuszczalność powietrza
    Opis:
    In this work, a carbon dioxide laser was used for the color-fading treatment of cotton/kapok denim fabrics. The results were analyzed thoroughly and compared with those of cotton denim fabric and PET denim fabric. Results showed that with laser treatment, the fabrics were colour-faded, and the K/S value of cotton/kapok fabric was reduced, while there was little change in the thickness and permeability. Because the internal air of the kapok fiber was squeezed out, the tensile strength of the fabric was decreased. The influence of laser power and speed on the kapok denim was also investigated. With an increase in the laser power and decrease in the speed, both the K/S values and strength decreased significantly. However, the changes were negligible for the thickness and permeability of the cotton/kapok denim fabric. It is therefore concluded that kapok is a good denim fabric material for the laser process.
    Wyniki analizowano i porównywano z wynikami uzyskiwanymi z tkanin denim z bawełny i PET. Wyniki wykazały, że przy zastosowaniu lasera zredukowano intensywność koloru, a wartość K/S została zredukowana przy małych zmianach grubości i przepuszczalności powietrza. Ponieważ wewnętrzne powietrze zawarte we włóknach kapoku było wyciskane na zewnątrz, wytrzymałość tkanin została zmniejszona. Badano również wpływ mocy lasera oraz szybkości przesuwania tkaniny denim na wartość KS i wytrzymałość. Stwierdzono, że wraz ze wzrostem mocy lasera i zmniejszeniem szybkości przesuwu tkaniny zarówno wartość KS jak i wytrzymałość zostały znacznie zmniejszone. Jednakże, zmiany grubości i przepuszczalności powietrza były minimalne. Stwierdzono, że włókna kapok są dobrym materiałem do tkanin typu denim.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 4 (118); 63-67
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Serological and molecular evidence of Coxiella burnetii in samples from humans and animals in China
    Autorzy:
    El-Mahallawy, H.S.
    Kelly, P.
    Zhang, J.
    Yang, Y.
    Wei, L.
    Tian, L.
    Fan, W.
    Zhang, Z.
    Wang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/49293.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2016, 23, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Probe Measurements of Electron Transport in GaN:Si/(Ga,Mn)N/GaN:Si Spin Filter Structures
    Autorzy:
    Kalbarczyk, K.
    Foltyn, M.
    Grzybowski, M.
    Stefanowicz, W.
    Adhikari, R.
    Li, Tian
    Kruszka, R.
    Kamińska, E.
    Piotrowska, A.
    Bonanni, A.
    Dietl, T.
    Sawicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398574.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Dc
    73.40.Cg
    73.43.Qt
    78.55.Cr
    Opis:
    Results of two-probe magnetoresistance studies in GaN:Si/(Ga,Mn)N/GaN:Si prospective spin filter structures are reported. It is postulated that transport characteristics are strongly influenced by highly conductive threading dislocations and that shrinking of the device size partially mitigates the issue. Simultaneously, maxima at ≈1500 Oe on overall weak, up to 2%, negative magnetoresistance are seen at low temperature, whose origin has been tentatively assigned to effects taking place at the contacts areas.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1196-1198
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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