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    Wyświetlanie 1-35 z 35
    Tytuł:
    A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China
    Autorzy:
    Sun, Z.
    Zeng, H.
    Zhao, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082242.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Trilobita
    Ptychopariida
    ontogeny
    specialization
    Miaolingian
    Paleozoic
    Longgang
    Asia
    Opis:
    Trilobites achieved their maximum generic diversity in the Cambrian, but the peak of morphological disparity of their cranidia occurred in the Middle to Late Ordovician. Early to middle Cambrian trilobites with a specialized cephalon are rare, especially among the ptychoparioids, a group of libristomates featuring the so-called “generalized” bauplan. Here we describe an unusual ptychopariid trilobite Phantaspis auritus gen. et sp. nov. from the middle Cambrian (Miaolingian, Wuliuan) Mantou Formation in the Shandong Province, North China. This new taxon is characterized by a cephalon with an extended anterior area of double-lobate shape resembling a pair of rabbit ears in later ontogenetic stages; a unique type of cephalic specialization that has not been reported from other trilobites. Such a peculiar cephalon as in Phantaspis provides new insights into the variations of cephalic morphology in middle Cambrian trilobites, and may represent a heuristic example of ecological specialization to predation or an improved discoidal enrollment.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 4; 709-718
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Analytic Investigation of "Hot-Spot" Formation in Compressible Energetic Materials
    Autorzy:
    Li, X.
    Zhao, F.
    Liu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358425.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    analytic model
    bulk compressibility
    pore collapse
    "hot-spot" formation
    Opis:
    In this paper, the formation of the shock-induced “hot-spot” in compressible energetic materials has been analyzed. By applying the compressible elastic-viscoplastic material model to a hollow sphere, and solving the governing equations with the initial and boundary conditions, this paper proposes an analytic pore collapse model that is able to simulate the viscoplastic deformation which determines the formation of a “hot-spot”. In this new model there are three mechanisms, of which instantaneous deformation and the subsequent quasi-static incompressible deformation dominate “hot-spot” formation, while quasi-static compressible deformation is of little effect. In comparison with the incompressible solution, this model demonstrates that the bulk compressibility has a great influence on “hot-spot” formation, as the degree of the “hot-spot” reaction is a positive quasi-linear function of Poisson’s ratio ν. An error in Kim’s original pore collapse model has also been discussed.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 806-820
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferrite Decarburization of High Silicon Spring Steel in Three Temperature Ranges
    Autorzy:
    Zhao, F.
    Zhang, C. L.
    Liu, Y. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/350822.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface decarburization
    steel
    oxidation
    carbon diffusion
    Opis:
    Surface decarburization of high silicon spring steel in ambient air was studied. The experimental results confirmed the decarburized mechanism under AC1 temperature, in the temperature range of AC1-AC3 and AC3-G. Under AC1 temperature, pearlite spheroidization and surface decarburization are carried out simultaneously and pearlite spheroidization is reinforced. Considering the oxidation loss depth, the “true ferrite decarburized depth” at 850 °C (AC3-G) is still smaller than that at 760°C (AC1-AC3). That is because an “incubation period” must pass away before ferrite decarburization occurs in the temperature range of AC3-G, and the ferrite decarburized rate is limited to being equal to the partial decarburized rate.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1715-1722
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inspection optimization model with imperfect maintenance based on a three-stage failure process
    Model optymalizacji przeglądów w warunkach niepełnej konserwacji oparty o trójfazowy proces uszkodzenia
    Autorzy:
    Yang, R.
    Zhao, F.
    Kang, J.
    Li, H.
    Teng, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365969.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    delay time modeling
    three-stage failure process
    inspection
    imperfect maintenance
    proportional age reduction
    Modelowanie metodą czasu zwłoki
    trójfazowy proces uszkodzenia
    przegląd
    konserwacja niepełna
    proporcjonalne obniżenie wieku
    Opis:
    Rolling element bearings are one of the most widely used and vulnerable components in complex systems. The condition monitoring work is very critical for sustaining the system’s availability and reducing the maintenance cost. Shock pulse method (SPM) is a common technique to measure the operating condition of rolling bearings as a three color scheme, e.g., green, yellow and red. This paper proposes an inspection model based on a three-stage failure process which aims to optimize the inspection interval of bearings by minimizing the expected cost per unit time. The three-stage failure process divides the bearings life into three stages before failure: good, minor defective and severe defective stages, corresponding to the three color scheme of SPM. Considering the need to lubricate bearings when the minor defective stage is identified by inspection in industrial applications, we assume that maintenance at the time of inspection identifying the minor defective stage is imperfect. The concept of proportional age reduction is used to model the effect of imperfect maintenance on the instantaneous rates of the minor defective stage, the severe defective stage and failure. Perfect maintenance however is carried out if inspection detects bearings being in the severe defective stage. Failure can be found once it occurs and replacement has to be implemented immediately. Finally, a numerical example is presented to illustrate the effectiveness of the proposed model.
    Łożyska toczne są jednymi z najczęściej stosowanych i jednocześnie najbardziej narażonych na uszkodzenia części składowych układów złożonych. Monitorowanie stanu odgrywa bardzo istotną rolę w utrzymaniu dostępności układów i zmniejszeniu kosztów ich obsługi. Metoda impulsów uderzeniowych (SPM) jest powszechnie stosowaną techniką służącą do pomiaru stanu pracy łożysk tocznych, który reprezentowany jest za pomocą kodu trzech kolorów, na przykład, zielonego, żółtego i czerwonego. W artykule zaproponowano model przeglądów oparty na trójfazowym procesie uszkodzenia, który ma na celu optymalizację częstotliwości przeglądów łożysk poprzez minimalizację oczekiwanych kosztów przypadających na jednostkę czasu. Pojęcie trójfazowego procesu uszkodzenia pozwala podzielić żywotność łożyska na trzy fazy przed wystąpieniem uszkodzenia: fazę dobrego stanu, fazę drobnych defektów i fazę poważnych defektów. Podział ten odpowiada kodowi trzech kolorów SPM. Biorąc pod uwagę konieczność smarowania łożysk po zdiagnozowaniu, podczas przeglądu w warunkach przemysłowych, wystąpienia fazy drobnych defektów, zakładamy, że konserwacja w czasie takiego przeglądu jest konserwacją niepełną. Koncepcja proporcjonalnego obniżenia wieku służy do modelowania wpływu niepełnej konserwacji na chwilowe wartości intensywności fazy drobnych defektów, fazy poważnych defektów oraz uszkodzeń. Gdy podczas przeglądu stwierdzi się, że łożysko jest w fazie poważnych defektów, przeprowadza się pełną konserwację. Uszkodzenie zostaje wykryte zaraz po jego wystąpieniu, i wtedy należy dokonać natychmiastowej wymiany łożyska. Pod koniec artykułu, przedstawiono przykład numeryczny, który ilustruje wydajność proponowanego modelu.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 2; 165-173
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    VvWRKY13 enhances ABA biosynthesis in Vitis vinifera
    Autorzy:
    Hao, J.
    Ma, Q.
    Hou, L.
    Zhao, F.
    Liu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/58583.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Abscisic acid (ABA) plays critical roles in plant growth and development as well as in plants’ responses to abiotic stresses. We previously isolated VvWRKY13, a novel transcription factor, from Vitis vinifera (grapevine), and here we present evidence that VvWRKY13 may regulate ABA biosynthesis in plants. When VvWRKY13 was ectopically expressed in Arabidopsis, the transgenic lines showed delayed seed germination, smaller stomatal aperture size, and several other phenotypic changes, indicating elevated ABA levels in these plants. Sequence analysis of several genes that are involved in grapevine ABA synthetic pathway identified WRKY-specific binding elements (W-box or W-like box) in the promoter regions. Indeed, transient overexpression of VvWRKY13 in grapevine leaves significantly increased the transcript levels of ABA synthetic pathway genes. Taken together, we conclude that VvWRKY13 may promote ABA production by activating genes in the ABA synthetic pathway.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2017, 86, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    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:
    Unravelling the Effect of Anthraquinone Metal Salts as Wide-range Plateau Catalysts to Enhance the Combustion Properties of Solid Propellants
    Autorzy:
    Wang, Y.
    Yan, Q.-L.
    An, T.
    Chen, B.
    Ji, Y.-P.
    Wang, W.
    Zhao, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/358042.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    solid propellants
    burning rate catalysts
    anthraquinone metal salts
    wide-range plateau combustion
    Opis:
    Novel lead and copper salts based on anthraquinone, including 1,8-dihydroxyanthraquinone,1,4,5,8-tetrahydroxyanthraquinone and 1,8-dihydroxy-4,5-dinitroanthraquinone, were prepared and characterized by Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and X-ray fluorescence (XRF). The catalytic effects of these compounds on the decomposition of nitrocellulose (NC) and on the combustion properties of double-base (DB) and composite modified double-base (CMDB) propellants were comprehensively investigated. The results demonstrated that the burning rate is significantly increased (by 200%) in the lower pressure range (2-6 MPa) as compared to the control systems without added anthraquinone-based salts. Concurrently, the pressure exponents (n) were obviously lower, exhibiting a “wide-range plateau” combustion phenomenon in the middle-pressure region. Specifically, for the DB propellants such a plateau region extended from 10 MPa to 16 MPa for n equal to 0.10, from 10 MPa to 18 MPa for n equal to 0.11 and from 8 MPa to 18 MPa when n is 0.05. In the case of RDX-CMDB propellants, the plateau was found to be in the range 6-18 MPa, with n in the range 0.16-0.27, depending on the type of catalyst, in contrast to the reference CMDB sample, which was characterized by n equal to 0.7 for the same pressure range.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 2; 376-390
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combustion Characteristics and Mechanism of Boron-based, Fuel-rich Propellants with Agglomerated Boron Powder
    Autorzy:
    Xu, H. -X.
    Pang, W.-Q.
    Guo, H.-W.
    Zhao, F.-Q.
    Wang, Y.
    Sun, Z.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/358733.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    analytical chemistry
    boron-based fuel-rich solid propellants
    agglomerated boron powder
    combustion performance
    combustion mechanism
    Opis:
    In order to extend the burning rate of boron-based, fuel-rich solid propellants with agglomerated boron powder, the effects of the boron content, the AP content, and of the magnesium powder content, on the burning rate and pressure exponent have been studied systematically. It has been shown that when the AP content is constant, the burning rate of the propellants increases with an increase in the agglomerated boron content. Furthermore, the burning rate and pressure exponent increase with increasing the contents of AP and magnesium powder. By means of single colour frame amplification photography and combustion wave tests, the combustion mechanism of these propellants has been investigated. It has been shown that the flame of the propellants becomes brighter by increasing the AP content, the dT/dxcp and dT/dxgp of the propellant FR-5 being around 6815 and 5789 °C/mm respectively, higher than those of FR-4, resulting in greater burning rates. The Ts of these propellants is above 683 °C, which is higher than the decomposition peak temperatures of agglomerated boron powder and of propellants (about 649 °C), which indicates that agglomerated boron powder is partially oxidized on the combustion surface, and the heat released from it may be beneficial to the combustion of the propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 4; 575-587
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of a High Energy Combustion Agent (BHN) and Its Effects on the Combustion Properties of Fuel Rich Solid Rocket Propellants
    Autorzy:
    Pang, W.-Q.
    Zhao, F.-Q.
    Xue, Y.-N.
    Xu, H.-X.
    Fan, X.-Z.
    Xie, W.-X.
    Zhang, W.
    Lv, J.
    Deluca, L. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358474.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    fuel rich solid propellant
    BHN
    DSC
    TG-DTG
    burning rate
    combustion properties
    Opis:
    A high energy combustion agent (tetraethylammonium decahydrodecaborate, BHN) was prepared by means of an ion exchange reaction (IER), and the prepared samples were characterized by the advanced diagnostic techniques of Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC) etc. The effects of BHN particles on the hazard and combustion properties of fuel rich solid propellants were investigated. The results showed that the BHN samples and fuel rich propellants containing BHN particles can be prepared successfully and solidified safely. The peak temperature of thermal decomposition and the heat of decomposition of the BHN samples prepared were 305.8 °C and 210.9 J•g-1 at a heating rate of 10 K•min-1, respectively. The burning rate and pressure exponent of fuel rich solid propellants decreases with increases in the fraction of BHN particles in the propellant formulation. Compared with the reference formulation (sample BP-1), the burning rate of the propellant with 10% mass fraction of BHN particles (sample BP-4) had decreased 30% at 3.0 MPa, and the pressure exponent had dropped from 0.44 to 0.41.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 3; 537-552
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial spectrum of four compounds from yeasts in koumiss
    Autorzy:
    Chen, Y.J.
    Du, C.G.
    Guo, Y.Q.
    Zhao, Y.F.
    Aorigele, C.
    Wang, C.J.
    Simujide, H.
    Aqima, W.
    Zhang, X.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087160.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Kluyveromyces marxianus
    Saccharomyces cerevisiae
    Escherichia coli
    minimum inhibition concentration
    minimum bactericidal concentration
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 2; 167-173
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration reduction design with hybrid structures and topology optimization
    Autorzy:
    Huo, F.
    Yang, D.
    Zhao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/260590.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hybrid structure
    vibration reduction
    materials selection
    topology optimization
    Opis:
    The hybrid structures show excellent performance on vibration reduction for ship, aircraft and spacecraft designs. Meanwhile, the topology optimization is widely used for structure vibration reduction and weight control. The design of hybrid structures considering simultaneous materials selection and topology optimization are big challenges in theoretical study and engineering applications. In this paper, according to the proposed laminate component method (LCM) and solid isotropic microstructure with penalty (SIMP) method, the mathematical formulations are presented for concurrent materials selection and topology optimizations of hybrid structures. Thickness distributions of the plies in laminate components are defined as materials selection design variables by LCM method. Relative densities of elements in the components are defined as topology design variables by SIMP method. Design examples of hybrid 3-bar truss structures and hybrid floating raft with vibration reduction requirements verified the effectiveness of the presented optimization models.
    Źródło:
    Polish Maritime Research; 2016, S 1; 10-19
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on electrokinetic of kaolinite particles in aqueous suspensions
    Autorzy:
    Min, F.
    Zhao, Q.
    Liu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110918.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    kaolinite
    zeta potential
    pH
    immersion time
    electrophoresis
    Opis:
    Influence of aqueous phase properties and process parameters on kaolinite particle zeta potential was quantified by electrophoresis experiments. The results indicated that pH strongly altered the zeta potential of kaolinite and it decreases at the beginning and then increases in the range of pH = 2–13. The activity of different cations changes the zeta potential and has the following tendency of Al3+ > Ca2+ > Mg2+ > Na+ and the zeta potential increases due to heterocoagulation of different mineral particles in suspension. It was found that the zeta potential of kaolinite particles increases after the suspension was stirred and decreases at the beginning, and then increases with soaking time. The FTIR results showed that the zeta potential takes into account ion adsorption and the change of Si–O, Al–O and Al–OH groups on the surface of the kaolinite particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 659-672
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pinning synchronization of the drive and response dynamical networks with lag
    Autorzy:
    Wen, B.
    Zhao, M.
    Meng, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/229648.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    complex networks
    lag synchronization
    pinning control
    Lorenz system
    Opis:
    This paper investigates the pinning synchronization of two general complex dynamical networks with lag. The coupling configuration matrices in the two networks are not need to be symmetric or irreducible. Several convenient and useful criteria for lag synchronization are obtained based on the lemma of Schur complement and the Lyapunov stability theory. Especially, the minimum number of controllers in pinning control can be easily obtained. At last, numerical simulations are provided to verify the effectiveness of the criteria.
    Źródło:
    Archives of Control Sciences; 2014, 24, 3; 257-270
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Bending and Recovery Behaviour of Woven Fabrics
    Modelowanie zginania i odprężenia elastycznego tkanin
    Autorzy:
    Shi, F.
    Zhao, Y.
    Wu, G.
    Zheng, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/234385.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    wool
    polyester fabrics
    bending
    viscoelasticity
    rheological model
    tkaniny wełniane
    tkaniny poliestrowe
    zginanie
    lepkosprężystość
    model reologiczny
    Opis:
    On the basis of viscoelastic theory of textile material, the viscoelastic solid model consisting of a spring element and viscous element either in series or parallel is one of the most useful research models to study the mechanical behaviour of fabrics. This paper presents a method to study the bending behaviour of wool/polyester fabrics using a model consisting of the three-element model in parallel with a sliding element on the assumption that the internal frictional moment is a constant during the bending processes. From the needs of practical study, a testing method has been presented to study the bending behaviour of wool/polyester fabrics using a KES-FB3 compression tester. A comparison and analysis of the experimental results and theoretical predictions indicate that the agreement between them is satisfactory.
    Lepkosprężysty model bryłowy składający się z elementu sprężystego i elementu lepkiego, w układzie szeregowym lub równoległym, jest jednym z najbardziej użytecznych modeli służącym do badania mechanicznego zachowania się tkanin. W pracy przedstawiono metodę badania zachowania się zginanych tkanin wełniano-poliestrowych za pomocą modelu składającego się z trój-elementowego modelu równoległego z elementem przesuwnym przy założeniu, że wewnętrzny moment tarcia jest stały podczas procesów gięcia. Na podstawie praktycznych badań przedstawiono metodę badania zachowania się gięcia tkanin wełniano-poliestrowych przy użyciu testera kompresji KES-FB3. Stwierdzono zadowalającą zgodność między wynikami eksperymentów a przewidywaniami teoretycznymi.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 6 (126); 41-45
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pinning synchronization of two general complex networks with periodically intermittent control
    Autorzy:
    Meng, F.
    Wen, B.
    Zhao, M.
    Bao, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/964048.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    complex networks synchronization
    pinning control
    intermittent control
    Opis:
    In this paper, the method of periodically pinning intermittent control is introduced to solve the problem of outer synchronization between two complex networks. Based on the Lyapunov stability theory, differential inequality method and adaptive technique, some simple synchronous criteria have been derived analytically. At last, both the theoretical and numerical analysis illustrate the effectiveness of the proposed control methodology. This method not only reduces the conservatism of control gain but also saves the cost of production.These advantages make this method having a large application scope in the real production process.
    Źródło:
    Archives of Control Sciences; 2015, 25, 4; 497-512
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Static Unbalance Analysis and Its Measurement System For Gimbals Axes of an Inertial Stabilization Platform
    Autorzy:
    Yang, H.
    Zhao, Y.
    Li, M.
    Wu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/221513.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inertial stabilization platform
    mass eccentricity
    angular position turntable
    dynamical model
    least-square fitting
    Opis:
    To reduce the influence of the static unbalance on an infrared missile guidance system, a new static unbalance measure system for the gimbals axes has been developed. Considering the coupling effects caused by a mass eccentricity, the static balance condition and measure sequence for each gimbal axis are obtained. A novel static unbalance test approach is proposed after analyzing the dynamic model of the measured gimbal axis. This approach is to drive the measured gimbal axis to do sinusoidal reciprocating motion in a small angle and collect its drive currents in real time. Then the static unbalance of the measured gimbal axis can be obtained by the current multi-cycle integration. Also a measuring system using the proposed approach has been developed. A balanced simulator is used to verify the proposed approach by the load and repeatability tests. The results show the proposed approach enhances the efficiency of the static unbalance measurement, and the developed measuring system is able to achieve a high precision with a greater stability.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 51-68
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on radiation characteristics of plasma Yagi antenna based on AIS base station in ships’ routeing waters
    Autorzy:
    Sun, Y.
    Chen, Y.
    Kong, F.
    Wei, Y.
    Zhan, F.
    Zhao, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117021.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    radio navigation
    radiation characteristics
    plasma Yagi antenna
    ships routeing
    AIS base station
    AIS based shipping routes
    ships routeing waters
    Automatic Identification System (AIS)
    Opis:
    A Yagi plasma antenna model was established by HFSS according to the relationship between plasma dielectric constant and electron density. The patterns were simulated by changing plasma parameters and the number of director dipoles. Results show that when the passive vibrators were switched off, the antenna is omnidirectional antenna. The directionality increases with the increase of the number of passive dipole and the main lobe of which narrows down. Then the plasma Yagi antenna model is established by plasma tube, the gain changed by changing the number of passive dipoles, so the plasma Yagi antenna has a very good reconfigurability. Results prove that the feasibility of the plasma Yagi antenna can be used on AIS base station of Ships’ Routeing waters. It can promote the communication and capability of maritime supervision in Ships’ Routeing waters.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 179-184
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized Stokes parameters of random electromagnetic quasi-homogeneous beams on propagation
    Autorzy:
    Chen, J
    Xin, Y
    Chen, Y
    Chen, F
    Zhao, Q
    Powiązania:
    https://bibliotekanauki.pl/articles/174819.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electromagnetic
    quasi-homogeneous
    generalized Stokes parameters
    polarization
    Opis:
    The expressions for the elements of the on-axis and transverse generalized Stokes parameters of random electromagnetic quasi-homogeneous beams on propagation are presented and are used to study the polarization properties of the beams. Some typical numerical calculations of the on-axis and transverse Stokes parameters, polarization properties of the beams on propagation are illustrated. The results show that for different sources all the on-axis parameters are identical in the near field and keep fixed values in the far field. But the transverse parameters are affected greatly by the properties of the source even in the near field. We have also found that the spatial profiles of the transverse parameters remain unchanged upon propagation.
    Źródło:
    Optica Applicata; 2013, 43, 2; s. 205-216
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration of backward-in-time model using drifting buoys in the East China Sea
    Autorzy:
    Yu, F.
    Li, J.
    Zhao, Y.
    Li, Q.
    Chen, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/47533.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    crude oil
    marine environment
    marine pollution
    oil spill
    China Sea
    random walk
    wind field
    calibration
    Opis:
    In the process of oil exploitation and transportation, large amounts of crude oil are often spilled, resulting in serious pollution of the marine environment. Forecasting oil spill reverse trajectories to determine the exact oil spill sources is crucial for taking proactive and effective emergency measures. In this study, the backward-in-time model (BTM) is proposed for identifying sources of oil spills in the East China Sea. The wind, current and random walk are three major factors in the simulation of oil spill sources. The wind drag coefficient varies along with the uncertainty of the wind field, and the random walk is sensitive to various traits of different regions, these factors are taken as constants in most of the state-of-the-art studies. In this paper, a self-adaptive modification mechanism for drift factors is proposed, which depends on a data set derived from the drifter buoys deployed over the East China Sea shelf. It can be well adapted to the regional characteristics of different sea areas. The correlation factor between predicted positions and actual locations of the drifters is used to estimate optimal coefficients of the BTM. A comparison between the BTM and the traditional method is also made in this study. The results presented in this paper indicate that our method can be used to predict the actual specific spillage locations.
    Źródło:
    Oceanologia; 2017, 59, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Levels and Oscillator Strength of Ni XXIII
    Autorzy:
    Hu, F.
    Jiang, G.
    Yang, J.
    Zhang, J.
    Zhao, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493444.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.V-
    31.30.jc
    Opis:
    Energy levels and oscillator strengths have been calculated for the fine-structure transitions among the levels of the $(1s^2) 2s^2 2 p^2,$ $2s2 p^3,$ $2p^4,$ $2s^2 2p3s,$ $2s^2 2p3p,$ and $2s^2 2p3d$ configurations of Ni XXIII using the graspVU and FAC program. The extensive configuration interaction and relativistic effects have been included while generating the wave functions. The results are compared with other recent theoretical estimates, and their accuracy is assessed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 429-437
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    n-sided polygonal hybrid finite elements involving element boundary integrals only for anisotropic thermal analysis
    Autorzy:
    Cao, R. F.
    Zhao, X. J.
    Lin, W. Q.
    Wang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/38597074.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    hybrid finite element
    polygon
    non-conforming mesh
    fundamental solution
    anisotropic material
    heat conduction
    Opis:
    As a combination of the traditional finite element method and boundary element method, the n-sided polygonal hybrid finite element method with fundamental solution kernels, named as HFS-FEM, is thoroughly studied in this work for two-dimensional heat conduction in fully anisotropic media. In this approach, the unknown temperature field within the polygon is represented by the linear combination of anisotropic fundamental solutions of problem to achieve the local satisfaction of the related governing equations, but not the specific boundary conditions and the continuity conditions across the element boundary. To tackle such a shortcoming, the frame temperature field is independently defined on the entire boundary of the polygonal element by means of the conventional one-dimensional shape function interpolation. Subsequently, by the hybrid functional with the assumed intra- and inter-element temperature fields, the stiffness equation can be obtained including the line integrals along the element boundary only, whose dimension is reduced by one compared to the domain integrals in the traditional finite elements. This means that the higher computing efficiency is expected. Moreover, any shaped polygonal elements can be constructed in a unified form with the same fundamental solution kernels, including convex and non-convex polygonal elements, to provide greater flexibility in meshing effort for complex geometries. Besides, the element boundary integrals endow the method higher versatility with a non-conforming mesh in the pre-processing stage of the analysis over the traditional FEM. No modification to the HFS-FEM formulation is needed for the non-conforming mesh and the element containing hanging nodes is treated normally as the one with more nodes. Finally, the accuracy, convergence, computing efficiency, stability of non-convex element, and straightforward treatment of non-conforming discretization are discussed for the present n-sided polygonal hybrid finite elements by a few applications in the context of anisotropic heat conduction.
    Źródło:
    Archives of Mechanics; 2020, 72, 2; 109-137
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of permeability of glass-sand soil
    Badanie przepuszczalności gleby piaszczysto-szklistej
    Autorzy:
    Wang, F. C.
    Feng, X. N.
    Gong, H.
    Zhao, H. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/231018.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gleba piaszczysto-szklista
    współczynnik przepuszczalności
    proporcje
    mieszanie szkła
    stopień konsolidacji
    glass-sand soil
    permeability coefficient
    proportions
    glass mixing
    consolidation degree
    Opis:
    The drainage consolidation method has been efficiently used to deal with soft ground improvement. Nowadays, it has been suggested to use a new sand soil which is a composite of sand and recycled glass waste. The permeability performance of glass-sand soil was explored to judge the feasibility of glass-sand soil backfilled in the drainage consolidation of sand-drained ground. For comparison purposes, different mix proportions of recycled glass waste, fineness modulus, and glass particle size were analyzed to certify the impact on the permeability coefficient and the degree of consolidation. The numerical results show that adding a proper amount of recycled glass waste could promote the permeability performance of glass-sand soil, and the glasssand soil drain could be consolidated more quickly than a sand drain. Experiments showed that glass-sand soil with the a 20% mix of recycled glass waste reveals the optimum performance of permeability.
    W pracy omówiono nową mieszaninę gleby piaszczystej, która zawiera piasek i odpady pochodzące z recyklingu szkła. Skupiono się na wskaźniku przepuszczalności gleby piaszczysto-szklistej, aby ocenić wykonalność gleby piaszczystoszklistej w konsolidacji drenażu gruntu drenowanego piaskiem. Dla celów porównawczych przeprowadzono analizę różnych ilości zmieszanych odpadów pochodzących z recyklingu szkła, wskaźnika miałkości oraz wielkości cząstek szkła, aby potwierdzić wpływ na współczynnik przepuszczalności i stopień konsolidacji. Można przewidzieć, że dobra przepuszczalność części gleby zastąpionej szkłem w odpływie może przyspieszyć konsolidację drenażu fundamentu. Opracowano próbkę piasku przy użyciu piasku naturalnego o jednorodnym gatunku, z maksymalną wielkością nominalną wynoszącą 10 mm. W badaniu użyto pozostałości szkła laminowanego.
    Źródło:
    Archives of Civil Engineering; 2017, 63, 3; 175-190
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An improved Otsu method for oil spill detection from SAR images
    Autorzy:
    Yu, F.
    Sun, W.
    Li, J.
    Zhao, Y.
    Zhang, Y.
    Chen, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/47553.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    remote sensing
    oil spill
    detection
    Otsu's method
    accident
    marine transport
    synthetic aperture radar
    Opis:
    In recent years, oil spill accidents have become increasingly frequent due to the development of marine transportation and massive oil exploitation. At present, satellite remote sensing is the principal method used to monitor oil spills. Extracting the locations and extent of oil spill spots accurately in remote sensing images reaps significant benefits in terms of risk assessment and clean-up work. Nowadays the method of edge detection combined with threshold segmenta- tion (EDCTS) to extract oil information is becoming increasingly popular. However, the current method has some limitations in terms of accurately extracting oil spills in synthetic aperture radar (SAR) images, where heterogeneous background noise exists. In this study, we propose an adaptive mechanism based on Otsu method, which applies region growing combined with both edge detection and threshold segmentation (RGEDOM) to extract oil spills. Remote sensing images from the Bohai Sea on June 11, 2011 and the Gulf of Dalian on July 17, 2010 are utilized to validate the accuracy of our algorithm and the reliability of extraction results. In addition, results according to EDCTS are used as a comparator to further explore validity. The comparison with results according to EDCTS using the same dataset demonstrates that the proposed self-adapting algorithm is more robust and boasts high-accuracy. The accuracy computing by the adaptive algorithm is significantly improved compared with EDCTS and threshold method.
    Źródło:
    Oceanologia; 2017, 59, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using a vision cognitive algorithm to schedule virtual machines
    Autorzy:
    Zhao, J.
    Mhedheb, Y.
    Tao, J.
    Jrad, F.
    Liu, Q.
    Streit, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/330838.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    cloud computing
    vision cognitive algorithm
    VM scheduling
    simulation
    chmura obliczeniowa
    algorytm poznawczy
    szeregowanie
    symulacja
    Opis:
    Scheduling virtual machines is a major research topic for cloud computing, because it directly influences the performance, the operation cost and the quality of services. A large cloud center is normally equipped with several hundred thousand physical machines. The mission of the scheduler is to select the best one to host a virtual machine. This is an NP-hard global optimization problem with grand challenges for researchers. This work studies the Virtual Machine (VM) scheduling problem on the cloud. Our primary concern with VM scheduling is the energy consumption, because the largest part of a cloud center operation cost goes to the kilowatts used. We designed a scheduling algorithm that allocates an incoming virtual machine instance on the host machine, which results in the lowest energy consumption of the entire system. More specifically, we developed a new algorithm, called vision cognition, to solve the global optimization problem. This algorithm is inspired by the observation of how human eyes see directly the smallest/largest item without comparing them pairwisely. We theoretically proved that the algorithm works correctly and converges fast. Practically, we validated the novel algorithm, together with the scheduling concept, using a simulation approach. The adopted cloud simulator models different cloud infrastructures with various properties and detailed runtime information that can usually not be acquired from real clouds. The experimental results demonstrate the benefit of our approach in terms of reducing the cloud center energy consumption.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 535-550
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving Triggering Characteristics for a Surface-Flashover Triggered Vacuum Switch
    Autorzy:
    He, Z.
    Wang, L.
    Li, F.
    Yao, W.
    Dong, M.
    Zhao, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807889.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Vp
    52.75.Kq
    52.25.Mq
    Opis:
    A surface-breakdown triggered vacuum switch with parallel disk electrodes and semiconductor surface flashover trigger electrode has many advantages, it is easy to be triggered and machined. The resistance of the trigger gap has been increased in terms of modifying the thickness of the semiconductor layer and improving coating process technology. The trigger gap resistance, trigger voltage and trigger waveforms were experimentally tested. The results show that the triggering characteristics can be improved by increasing the trigger resistance.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1019-1021
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Ephedra species by phylogenetic analyses using matK and ITS1 sequences
    Autorzy:
    Zhao, Y.S.
    Xie, L.X.
    Mao, F.Y.
    Cao, Z.
    Wang, W.P.
    Zhao, Q.P.
    Zhang, X.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/56673.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In this study, the species identifications of seven Ephedra plants, including three medicinal plants from the Pharmacopoeia of the People’s Republic of China, were conducted using phylogenetic analyses, and the method’s validity was verified. The phylogenetic trees constructed from the maturase-coding gene (matK) and internal transcribed spacer 1 (ITS1) sequences showed that the former could be used for identifying five Ephedra plants, Ephedra intermedia, E. equisetina, E. antisyphilitica, E. major, and E. aphylla, but it had less power to discriminate E. sinica and E. przewalskii, while the latter could distinguish five Ephedra plants, E. przewalskii, E. equisetina, E. antisyphilitica, E. major, and E. aphylla, but it had less power to discriminate E. sinica and E. intermedia. However, when the two genes were combined, the seven species could be completely distinguished from each other, especially the medicinal plants from the others, which is significant in developing their pharmaceutical uses and in performing quality control assessments of herbal medicines. The method presented here could be applied to the analysis of processed Ephedra plants and to the identification of the botanical origins of crude drugs. Additionally, we discovered that E. equisetina and E. major were probably closely related to each other, and that E. sinica, E. intermedia, and E. przewalskii also had a close genetic relationship.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral degrees of cross-polarization of stochastic anisotropic electromagnetic beams in modified non-Kolmogorov atmospheric turbulence
    Autorzy:
    Chen, F.
    Chen, J.
    Zhao, Q.
    Chen, Y
    Xin, Y.
    Li, J.
    Pan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174614.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quasi-homogenous source
    modified non-Kolmogorov turbulence
    generalized Stokes parameters
    Opis:
    Based on the extended Huygens–Fresnel principle, variations in generalized Stokes parameters of stochastic anisotropic electromagnetic beams propagating through modified non-Kolmogorov atmospheric turbulence have been analyzed. The changes in generalized Stokes parameters with different turbulence parameters and source parameters were analyzed first. After that, the distributions of the spectral degrees of cross-polarization (SDCP) of isotropic beams and anisotropic beams were simulated. The results show that the profiles of distribution of SDCP of these two kinds of beams are very different in the near field, and will fluctuate through the propagation in atmospheric turbulence, but at last, when the propagation distance is long enough, the difference in the source makes a slight difference in the final profiles of SDCP in the output plane. They mainly depended on the turbulence perturbation, and in the weak turbulence, the profiles of final distribution show more flatter features.
    Źródło:
    Optica Applicata; 2013, 43, 4; 773-783
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship recognition and tracking system for intelligent ship based on deep learning framework
    Autorzy:
    Liu, B.
    Wang, S. Z.
    Xie, Z. X.
    Zhao, J. S.
    Li, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/117419.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    intelligent ship
    deep learning framework
    ship recognition system
    ship tracking system
    ship recognition and tracking system
    intelligent navigation
    autonomous ship
    maritime safety
    Opis:
    Automatically recognizing and tracking dynamic targets on the sea is an important task for intelligent navigation, which is the prerequisite and foundation of the realization of autonomous ships. Nowadays, the radar is a typical perception system which is used to detect targets, but the radar echo cannot depict the target’s shape and appearance, which affects the decision-making ability of the ship collision avoidance. Therefore, visual perception system based on camera video is very useful for further supporting the autonomous ship navigational system. However, ship’s recognition and tracking has been a challenge task in the navigational application field due to the long distance detection and the ship itself motion. An effective and stable approach is required to resolve this problem. In this paper, a novel ship recognition and tracking system is proposed by using the deep learning framework. In this framework, the deep residual network and cross-layer jump connection policy are employed to extract the advanced ship features which help enhance the classification accuracy, thus improves the performance of the object recognition. Experimentally, the superiority of the proposed ship recognition and tracking system was confirmed by comparing it with state of-the-art algorithms on a large number of ship video datasets.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 4; 699-705
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving spodumene flotation using a mixed cationic and anionic collector
    Autorzy:
    Wang, Y.
    Zhu, G.
    Yu, F.
    Lu, D.
    Wang, L.
    Zhao, Y.
    Zheng, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/109883.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spodumene
    lithium
    silicates
    flotation
    anionic surfactant
    cationic surfactant
    Opis:
    Lithium, a rare-earth element, has been in increasing demand. Spodumene flotation is an important and challenging step for lithium extraction and production from lithium ore. In the present work, flotation tests for three pure minerals (i.e., spodumene, quartz and feldspar) and a real spodumene ore were carried out at laboratory scale. The results showed that YOA, a mixture of oleic acid and dodecylamine with the molar ration of 10:1, could be used as collector to produce a spodumene concentrate with grade of 5.59% Li2O from the feed ore with grade of 1.48% Li2O where 85.24% of Li2O was recovered to the concentrate. The measured zeta potential, contact angle and adsorption capacity indicated that YOA was preferentially adsorbed on spodumene instead of on quartz or feldspar, with the spodumene surface being more hydrophobic than that of feldspar or quartz. The adsorption energies of YOA on spodumene were calculated and the results provided insights into the superior flotation performance obtained in the present work.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 567-577
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes
    Autorzy:
    Guo, X.
    Wang, R.-Q.
    Wang, C.D.
    Xu, F.
    Zhao, S.
    Guo, W.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41339.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Acer truncatum
    seedling
    Quercus variabilis
    Chinese cork oak
    plant response
    light regime
    irradiance acclimation
    chlorophyll fluorescence
    morphology
    photoinhibition
    Opis:
    In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area, and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment increased stem diameter at ground height, effective quantum yield, photochemical quenching and decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q. variabilis among three light conditions. With respect to newly developed leaves, no significant differences were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH treatment increased compared to those of CH treatment while no difference was found for A. truncatum between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll fluorescence parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places with heterogeneous light conditions.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protective effects of molecular hydrogen on hepatotoxicity induced by sub-chronic exposure to chlorpyrifos in rats
    Autorzy:
    Xun, ZM.
    Xie, F.
    Zhao, PX.
    Liu, MY.
    Li, ZY.
    Song, JM.
    Kong, XM.
    Ma, XM.
    Li, XY.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085965.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    oxidative stress
    hepatotoxicity
    chlorpyrifos
    molecular hydrogen
    mitochondrial pathway
    Opis:
    Introduction. Chlorpyrifos (CPF) is a organophosphate insecticide widely used in agriculture with attendant adverse health outcomes. Chronic exposure to CPF induces oxidative stress and elicits harmful effects, including hepatic dysfunction. Molecular hydrogen has been identified as a novel antioxidant which could selectively scavenge hydroxyl radicals. Objective. The aim of this study was to determine whether the intake of hydrogen-rich water (HRW) could protect rats from hepatotoxicity caused by sub-chronic exposure to CPF. Materials and method. Rats were treated with hydrogen-rich water by oral intake for 8 weeks. Biochemical indicators of liver function, SOD and CAT activity, GSH and MDA levels were determined by the spectrophotometric method. Liver cell damage induced by CPF was evaluated by histopathological and electron microscopy analysis. PCR array analysis was performed to investigated the effects of molecular hydrogen on the regulation of oxidative stress related genes. Results. Both the hepatic function tests and histopathological analysis showed that the liver damage induced by CPF could be ameliorated by HRW intake. HRW intake also attenuated CPF induced oxidative stress, as evidenced by restored SOD activities and MDA levels. The results of PCR Array identified 12 oxidative stress-related genes differentially expressed after CPF exposure, 8 of chich, including the mitochondrial Sod2 gene, were significantly attenuated by HRW intake. The electron microscopy results indicated that the mitochondrial damage caused by CPF was alleviated after HRW treatment. Conclusions. The results obtained suggest that HRW intake can protect rats from CPF induced hepatotoxicity, and the oxidative stress signaling and the mitochondrial pathway may be involved in the protection of molecular hydrogen.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 3; 368-373
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of a linear epitope in the capsid protein of goose astrovirus with monoclonal antibody
    Autorzy:
    Dai, G.
    Huang, X.
    Liu, Q.
    Li, Y.
    Zhang, L.
    Han, K.
    Yang, J.
    Liu, Y.
    Xue, F.
    Zhao, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647377.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    epitope
    goose astrovirus
    capsid protein
    monoclonal antibody
    Opis:
    Goose astrovirus (GoAstV) is a novel avastrovirus that typically causes gosling gout and results in 2 to 20% mortality. GoAstV capsid protein is the sole structural protein, which is responsible for viral attachment, assembly, maturation as well as eliciting host antibodies. However, the epitopes within capsid protein have not been well studied. In this study, a monoclonal antibody, named 1D7, was generated against GoAstV capsid protein by hybridoma technology. Western blot results showed that this MAb could react with recombinant capsid protein expressed in E. coli. Also, it recognized the precursor of capsid protein, VP90 and VP70, in GoAstV-infected cells. Besides, excellent specificity of MAb 1D7 was further demonstrated in indirect immunofluorescence assay and immunohistochemical analysis. Epitope mapping results revealed that MAb 1D7 recognized the epitope 33QKVY 36 within Cap protein. Sequence alignment indicated that 33QKVY 36 is a conserved epitope among the isolates of goose astrovirus type 2 (GoAstV-2), suggesting the potential for its use in GoAstV-2 specific diagnostic assay. These findings may provide some insight into a function of the GoAstV capsid protein and further contribute to the development of diagnostic methods for GoAstV infection.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 4; 579-587
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The unsteadiness of tip clearance flow and its effect to stability of transonic axial compressor
    Nieustaloność przepływu w szczelinie wierzchołkowej i jej wpływ na stabilność pracy przydźwiękowej sprężarki osiowej
    Autorzy:
    Hu, J. F.
    Zhu, X. C.
    Ou-Yang, H.
    Tian, J.
    Wu, Y. D.
    Qiang, X. Q.
    Zhao, G.
    Du, Z. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/281445.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    tip leakage flow
    compressor
    stability
    Opis:
    The steady and unsteady RANS simulations of a transonic compressor rotor (NASA rotor 37) are performed to investigate the tip clearance flow characteristic and correlations between tip leakage flow and compressor stability. For steady simulations, the results are compared with the aerodynamic probe and laser anemometer data. The speed lines and span-wise aerodynamic parameters agree well with the experimental data. On the other hand, the tip clearance flow of unsteady simulations are analysed clearly at a near stall condition. The results show that there is a mass flow rate boundary. The tip clearance flow oscillates substantially with a frequency about 50% BPF when the mass is less than that, which is caused by tip clearance flow, shock, and the interaction between them and the oncoming flow. The interface between the oncoming flow and clearance flow shifts forward, and the tip clearance flow may spill over into the adjacent blade passage as the mass flow decreases, which may results in the spike stall inception.
    W pracy przedstawiono symulacje stanu ustalonego i nieustalonego przydźwiękowej sprężarki osiowej (turbina NASA 37) z zastosowaniem metody Reynoldsa uśredniania równań Naviera-Stokesa (RANS) w celu zbadania charakterystyki przepływu w szczelinie wierzchołkowej oraz określenia zależności pomiędzy stratami związanymi z upływem w tej szczelinie a stabilnością pracy sprężarki. Wyniki symulacji stanu ustalonego porównano z danymi doświadczalnymi uzyskanymi za pomocą sondy aerodynamicznej i laserowego wiatromierza. Wyznaczone wzdłuż rozpiętości sprężarki linie prędkości przepływu i jego parametry aerodynamiczne okazały się zgodne z danymi doświadczalnymi. W przypadku symulacji stanu nieustalonego, analizę przepływu w szczelinie wierzchołkowej przeprowadzono dla warunków bliskich oderwania, tj. utraty wydajności sprężarki, wyznaczając graniczny wydatek przepływu dla takiej sytuacji. Poniżej tej granicznej wartości, zmiany przepływu w szczelinie oscylują z częstotliwością sięgającą 50% częstotliwości przejścia łopatek (tzw. BPF), co jest konsekwencją interakcji wywołanej zderzeniem przepływu z falą napływową w szczelinie wierzchołkowej. Powierzchnia tej interakcji przesuwa się do przodu, a sam przepływ może rozpaść się na fragmenty znajdujące ujście w kanałach przyległych łopatek. Zjawisko to zachodzi przy malejącym wydatku, a to z kolei może indukować oderwanie przepływu skokowymi zmianami mocy współpracującego silnika.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 431-438
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Flash Lamp Annealing on the Optical Properties of CIGS Layer
    Autorzy:
    Prucnal, S.
    Jiao, F.
    Reichel, D.
    Zhao, K.
    Cornelius, S.
    Turek, M.
    Pyszniak, K.
    Drozdziel, A.
    Skorupa, W.
    Helm, M.
    Zhou, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199248.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.40.jn
    61.72.Cc
    78.55.Hx
    Opis:
    Copper indium gallium diselenide (CIGS) becomes more significant for solar cell applications as an alternative to silicon. The quality of the layer has a critical impact on the final efficiency of the solar cell. An influence of the post-deposition millisecond range flash lamp annealing on the optical and microstructural properties of the CIGS films was investigated. Based on the Raman and photoluminescence spectroscopy, it is shown that flash lamp annealing reduces the defect concentration and leads to an increase of the photoluminescence intensity by a factor of six compared to the nonannealed sample. Moreover, after flash lamp annealing the degradation of the photoluminescence is significantly suppressed and the absolute absorption in the wavelength range of 200-1200 nm increases by 25%.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1404-1407
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvements in timber production of Chinese fir (Cunninghamia lanceolata) per unit forest area in China via tree breeding: Status and challenges
    Autorzy:
    Zhou, B.
    Peng, D.
    Zhao, Q.
    Yangnan, S.
    Yang, S.
    Yang, F.
    Qu, G.
    Tang, W.
    Ou, J.
    Xiang, W.
    Xiang, J.
    Deng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077649.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Cunninghamia lanceolata
    genetic improvement
    timber volumes per unit forest area
    wood properties
    proposals
    recommendations
    Opis:
    Chinese fir [Cunninghamia lanceolata (Lamb.) Hook] is a fast-growing tree species that is widely planted for timber production in southern China. Many high-quality breeding systems for Chinese fir have been developed using genetic methods. Here, we systematically review progress in increasing Chinese fir timber volumes per unit forest area in China, using genetic methods. We comprehensively assess the objec- tives, strategies, and primary accomplishments of the first to fourth generations of a Chinese fir breeding program. Furthermore, we propose a genetic improvement program and protocol for Chinese fir, and out- line several recommendations with respect to the main challenges associated with using genetic methods to increase timber yields. Finally, we present a series of proposals to increase Chinese fir timber production in China. This review offers insight into genetic improvements that have increased timber volumes of Chi- nese fir over four generations of breeding, and provides direction for future genetic improvements to wood properties.
    Źródło:
    Dendrobiology; 2020, 83; 43-51
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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