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    Wyświetlanie 1-11 z 11
    Tytuł:
    Research on E.C. Bingham constitutive model of rock under impact load for deep well
    Wykorzystanie modelu E.C. Binghama przy badaniu skał narażonych na obciążenia udarowe w górnictwie podziemnym
    Autorzy:
    Zhao, G. M.
    Xie, L. X.
    Meng, X. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/348692.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    SHPB
    teoria odkształceń ciągłych
    statystyczna teoria odkształceń
    równanie powstawania odkształceń
    model E.C. Bingham'a
    continuum damage theory
    statistical damage theory
    constitutive equation of damage excess stress model
    E.C. Bingham constitutive model
    Opis:
    The soft rock materials have special dynamic properties in deep mining. Their dynamic compression tests are performed with experimental system of Split Hopkinson Pressure Bar (SHPB). The results of experiment indicate that the dynamic stress-strain curves of rock materials are of distinct plastic yield characteristics. Based on modified excess stress model, according to the function relationship between strain, strain rate and, to simplify constitutive equation of modified excess stress model with dimensionless analysis, the simplified constitutive equation of modified excess stress model is obtained; And then, continuum damage theory and statistical damage theory are incorporated into the simplified constitutive equation of modified excess stress model account for the influence of damage to dynamic strength, the simplified constitutive equation of damage excess stress model is built up. The simplified constitutive functions are fitted out respectively on the basis of the experimental data. There is a good coherence between the fitting stress-strain curves and the experimental stress-strain curves.
    Miękkie materiały skalne w kopalniach głębokich posiadają specyficzne właściwości dynamiczne. Wykonano testy kompresji dynamicznej przy zastosowaniu urządzenie kompresyjnego Hopkinsona (Split Hopkinson Pressure Bar SHPB). Wyniki przeprowadzonych badań wykazały, krzywe wykresu rozciągania skał mają charakterystykę typową dla materiałów upłynnionych. W oparciu o model rozkładu naprężeń, zgodnie z funkcją zależności pomiędzy typem odkształcenia a jego szybkością, celem uproszczenia równania odkształcenia zmodyfikowanego przy pomocy analizy bezwymiarowej, otrzymano równanie opisujące model naprężeń zmodyfikowanych. Następnie wykorzystano teorię ciągłego kontinuum oraz teorię statystyki odkształceń w równaniu odkształcenia zmodyfikowanego celem ustalenia zależności z badanym modelem. Uproszczone w ten sposób funkcje skorelowano na podstawie otrzymanych danych doświadczalnych. Ustalono wysoką spójność pomiędzy krzywymi teoretycznymi i doświadczalnymi.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 3; 489-500
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new composition theorem for sp-weighted pseudo almost periodic functions and applications to semilinear differential equations
    Autorzy:
    Zhao, Z.
    Chang, Y.
    N'Guerekata, G. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/256044.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Sp-weighted pseudo almost periodic
    weighted pseudo almost periodicity
    semilinear differential equations
    Opis:
    In this paper, we establish a new composition theorem for Sp-weighted pseudo almost periodic functions under weaker conditions than the Lipschitz ones currently encountered in the literatures. We apply this new composition theorem along with the Schauder's fixed point theorem to obtain new existence theorems for weighted pseudo almost periodic mild solutions to a semilinear differential equation in a Banach space.
    Źródło:
    Opuscula Mathematica; 2011, 31, 3; 457-474
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground liquefaction and deformation analysis of breakwater structures under earthquakes
    Autorzy:
    Zhao, J.
    Wang, Y.
    Yun, G.
    Ashraf, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/258448.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    breakwater
    seismic design
    liquefaction
    excessive pore pressure ratio
    displacement
    Opis:
    Ground liquefaction and deformation is one of the important causes that damage engineering structures. Chinese current code for seismic design of breakwater is based on the single-level seismic design method as well as code for port and water-way engineering. However, this code can not exactly reflect the seismic performance of breakwater structures which experience different seismic intensities. In this paper, the author used a finite difference software, namely, FLAC3D, to analyze the state and compute seismic responses of breakwater structure. The breakwater foundation’s pore pressure ratio and displacement due to different earthquake have been studied. And the result show that: Smaller earthquakes have little influence on serviceability of the foundation, and severe earthquakes can liquefy some parts of the foundation; In the latter case , obvious changes of pores and foundation displaces can be found. Particularly, when seismic peak acceleration reachs 0.2g, Liquefaction appears in the foundation and mainly concentrated in the upper right side of the structure. In addition, the survey of ultra-hole pressure and displacement values of sand layers of the breakwater, manifests when the ultra pore pressure near 1.0, displacement and overturning structure is relatively large, resulting in varying degrees of damage to the structure. This paper’s research can provide theoretical and designable reference for similar engineering structures.
    Źródło:
    Polish Maritime Research; 2016, S 1; 109-114
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The cavitation nuclei transient characteristics of Lennard-Jones fluid in cavitation inception
    Autorzy:
    Fu, Q.
    Zhang, B.
    Zhao, Y.
    Zhu, R.
    Liu, G.
    Li, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259255.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    cavitation nuclei
    molecular dynamics simulation
    Lennard-Jones fluid
    cavitation inception
    nucleation
    Opis:
    In the field of ocean engineering, cavitation is widespread, for the study of cavitation nuclei transient characteristics in cavitation inception, we applied theoretical analysis and molecular dynamics (MD) simulation to study Lennard-Jones (L-J) fluid with different initial cavitation nuclei under the NVT-constant ensemble in this manuscript. The results showed that in cavitation inception, due to the decrease of liquid local pressure, the liquid molecules would enter the cavitation nuclei, which contributed to the growth of cavitation nuclei. By using molecular potential energy, it was found that the molecular potential energy was higher in cavitation nuclei part, while the liquid molecular potential energy changes greatly at the beginning of the cavitation nuclei growth. The density of the liquid and the surface layer changes more obvious, but density of vapor in the bubble changes inconspicuously. With the growth of cavitation nuclei, the RDF peak intensity increased, the peak width narrowed and the first valley moved inner. When cavitation nuclei initial size reduced, the peak intensity reduced, the corresponding rbin increased. With the decrease of the initial cavitation nuclei, the system pressure and total energy achieved a balance longer, and correspondingly, they were smaller. In addition, at the beginning of the cavitation nuclei growth, the total energy and system pressure changed greatly.
    Źródło:
    Polish Maritime Research; 2018, S 2; 75-84
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Dynamics Simulation Studies of the CL-20/DNB Co-crystal
    Autorzy:
    Sun, T.
    Xiao, J. J.
    Ji, G. F.
    Zhao, F.
    Xiao, H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358075.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    CL-20/DNB co-crystal
    composite
    interactions
    mechanical properties
    molecular dynamics simulation
    Opis:
    Molecular dynamics (MD) simulation was conducted for a DNB (1,3-dinitrobenzene) crystal, a ε-CL-20 (2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane) crystal, a CL-20/DNB co-crystal and a CL-20/DNB composite. From the calculated maximum bond length (Lmax) of the N−NO2 trigger bond, the cohesive energy density (CED) and the binding energy (Ebind), it was found that the CL-20/DNB co-crystal is more insensitive than its composite. Its thermal stability is also better than that of its composite. The pair correlation function (PCF) analysis method was applied to investigate the interfaces between different molecular layers in the CL-20/DNB co-crystal, and in the composite. Additionally, the calculated mechanical data showed that the moduli of the CL-20/DNB co-crystal and its composite are smaller and their elastic elongation and ductility are better than those of the ε-CL-20 and DNB crystals.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 3; 677-693
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of flow softening mechanisms of a nickel-based superalloy with o phase
    Autorzy:
    Lin, Y. C.
    He, D.-G
    Chen, M. S.
    Chen, X.-M.
    Zhao, C.-Y.
    Ma, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/958203.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloys
    hot deformation
    flow softening behavior
    microstructural evolution
    Opis:
    The flow softening behaviors of a nickel-based superalloy with o phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD). optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s-1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s-1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of 6 phase (Ni3Nb).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1537-1546
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Analysis of the TE Mode Cerenkov Type Second Harmonic Generation in Ion-Implanted X-Cut Lithium Niobate Planar Waveguides
    Autorzy:
    Du, G.
    Li, G.
    Zhao, S.
    Qiao, W.
    Yang, K.
    An, J.
    Li, M.
    Wang, J.
    Wang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808109.pdf
    Data publikacji:
    2009-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Dd
    42.82.Et
    Opis:
    We present a study of the Cerenkov configuration second harmonic generation in X-cut ion-implanted lithium niobate waveguides. An approximate solution of conversion efficiency is given and plotted which shows that it is very sensitive to the waveguide depth and pump wavelength. The results can be used in the design of waveguides for the efficient second harmonic generation in the Cerenkov configuration.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 3; 685-689
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic analysis of embedded chains in mooring line for fish cage system
    Autorzy:
    Hou, H. M.
    Dong, G. H.
    Xu, T. J.
    Zhao, Y. P.
    Bi, C. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259892.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    embedded chains
    soil resistance
    parameter sensitivity
    dynamic analysis
    Opis:
    Investigation of the embedded chains in soil starts to play an important role in understanding the structural performance of mooring system, when the embedded anchors will be employed to sustain large loads with the gradually growth of installation depth of offshore aquaculture farm. The aim of this study is to investigate the dynamic response of mooring line considering the influence of embedded chains in clay soil for net cage system. Lumped-mass method is used to establish the numerical model for evaluating the performance of mooring line with embedded chains. To validate the numerical model, comparisons of numerical results with the analytical formulas and the experimental data are conducted. A good agreement of the profile and the tension response is obtained. Then, the effect of embedded chains on the static and dynamic response of mooring line is evaluated, and the dynamic behavior of mooring system considering embedded chains for net cage system is investigated. The results indicate that the soil resistance on embedded chains should be included to predict the mooring line development and the load on the embedded anchors in the numerical simulations. An appropriate safety factor should be included if employing the simplified model Case C at the initial design phase. And the effect of embedded chains on the holding capacity of embedded anchors in single-point mooring system for single net cage cannot be negligible during the design and operation phases. Consequently, it is profound to take into account the interaction of embedded chains and soil for accurately predicting the reliability of mooring system for fish cage.
    Źródło:
    Polish Maritime Research; 2018, 4; 83-97
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impacts of BSMV on vegetative growth and water status in hulless barley (Hordeum vulgare var. nudum) in VIGS study
    Autorzy:
    Liang, J.
    Chen, X.
    Zhao, H.
    Yu, S.
    Long, H.
    Deng, G.
    Pan, Z.
    Yu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/57548.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Hordeum vulgare var.nudum
    hulled barley
    barley
    BSMV zob.barley stripe mosaic virus
    barley stripe mosaic virus
    vegetative growth
    water status
    VIGS zob.virus induced gene silencing method
    virus induced gene silencing method
    Opis:
    Barley stripe mosaic virus (BSMV) is an established and extensively used virus-induced gene silencing (VIGS) vector for gene function analysis in monocots. However, the phenotypes generated by targeted gene silencing may be affected or masked by symptoms of BSMV infection. To better understand the potential effects of BSMV-VIGS in hulless barley (Hordeum vulgare var. nudum), the accumulation pattern of BSMV and its impacts on vegetative growth and water status were investigated. The results indicated that the vegetative growth of infected plants was significantly and continuously impacted by BSMV from 10 to 40 days post inoculation (dpi). When the accumulation of BSMV was extremely high (7 to 11 dpi), infected plants displayed twisted leaf tips with an increased water lose rate (WLR) and decreased water content (WC). Virus accumulation declined and stabilized after 25 dpi, at this stage, the WLR and WC were unaffected in the infected plants. The efficiency of VIGS was tested by the silencing of Phytoene desaturase (PDS). RT-qPCR indicated that BSMV-VIGS can be sustained with good efficiency for up to 40 dpi under an altered condition with lower temperature (22 ±1°C) and higher relative humidity (70 ±10%). It was concluded that 25 to 40 dpi was the appropriate time zone for drought-related gene analysis by BSMV-VIGS under such condition.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2015, 84, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic damage behaviour of aeolian sand reinforced concrete columns with I-shaped structural steel
    Autorzy:
    Wang, Y. H.
    Wang, H. Y.
    Wang, Y. P.
    Zhao, M.
    Qi, J.
    Huo, G. Z.
    Liu, P. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849772.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piasek eoliczny
    słup żelbetowy
    stal konstrukcyjna
    przekrój I
    zachowanie
    uszkodzenie sejsmiczne
    model uszkodzenia
    aeolian sand
    column
    I-shaped steel
    structural steel
    seismic damage
    behaviour
    damage model
    Opis:
    To promote the application of aeolian sand resources for steel-concrete composite structures, an aeolian sand reinforced concrete column with I-shaped structural steel is proposed in this study. Four specimens are designed and manufactured with different replacement rates of aeolian sand. The seismic behaviour and damage evolution process of the specimens are studied by low-cycle repeated loading tests. Based on the test results, the mechanical characteristics, failure modes, hysteresis curves, skeleton curves, energy dissipation capacity, displacement ductility, and stiffness degradation of the specimens with different replacement rates of aeolian sand are analysed. In addition, the effects of the design parameters on the seismic behaviour of the specimens are also studied. The results show that the indexes of the seismic behaviour can be significantly improved by adding steel. Moreover, a revised damage model is proposed, to better reflect the evolution law of seismic damage of aeolian sand reinforced concrete columns with steel. The proposed model can provide an important reference for seismic damage assessment of the columns.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 633-650
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring
    Autorzy:
    Zhang, J.
    Li, Y.
    Xu, E.
    Jiang, L.
    Tang, J.
    Li, M.
    Zhao, X.
    Chen, G.
    Zhu, H.
    Yu, X.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087465.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bacterial communities
    broilers
    high-throughput sequencing
    particulate matter
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 495-504
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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