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    Wyświetlanie 1-12 z 12
    Tytuł:
    Exponential decay of solutions to a class of fourth-order nonlinear hyperbolic equations modeling the oscillations of suspension bridges
    Autorzy:
    Liu, Yang
    Yang, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/2048892.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fourth-order nonlinear hyperbolic equations
    weak solutions
    exponential decay
    family of potential wells
    Opis:
    This paper is concerned with a class of fourth-order nonlinear hyperbolic equations subject to free boundary conditions that can be used to describe the nonlinear dynamics of suspension bridges.
    Źródło:
    Opuscula Mathematica; 2022, 42, 2; 239-255
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Formulae for the Decycling Number of Graphs
    Autorzy:
    Yang, Chao
    Ren, Han
    Powiązania:
    https://bibliotekanauki.pl/articles/31343660.pdf
    Data publikacji:
    2019-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    decycling number
    independence number
    cycle rank
    margin number
    Opis:
    A set $S$ of vertices of a graph $G$ is called a decycling set if $G−S$ is acyclic. The minimum order of a decycling set is called the decycling number of $G$, and denoted by $ \nabla(G)$. Our results include: (a) For any graph $G$, $ \nabla (G) = n - \max_T \{ \alpha (G- E(T)) \} $, where $T$ is taken over all the spanning trees of $G$ and $ \alpha (G − E(T)) $ is the independence number of the co-tree $ G − E(T) $. This formula implies that computing the decycling number of a graph $G$ is equivalent to finding a spanning tree in $G$ such that its co-tree has the largest independence number. Applying the formula, the lower bounds for the decycling number of some (dense) graphs may be obtained. (b) For any decycling set $S$ of a $k$-regular graph $G$, $ |S| = \frac{1}{k-1} (\beta (G) + m(S)) $, where $ \beta(G) = |E(G)|−|V (G)|+1 $ and $ m(S) = c+|E(S)|−1$, $c$ and $|E(S)|$ are, respectively, the number of components of $G − S$ and the number of edges in $G[S]$. Hence $S$ is a $ \nabla$-set if and only if $m(S)$ is minimum, where $ \nabla$-set denotes a decycling set containing exactly $ \nabla(G)$ vertices of $G$. This provides a new way to locate $ \nabla(G) $ for $k$-regular graphs $G$. (c) 4-regular graphs $G$ with the decycling number $ \nabla (G) = \ceil{ \tfrac{ \beta(G)}{3} } $ are determined.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2019, 39, 1; 125-141
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower Bound on the Number of Hamiltonian Cycles of Generalized Petersen Graphs
    Autorzy:
    Lu, Weihua
    Yang, Chao
    Ren, Han
    Powiązania:
    https://bibliotekanauki.pl/articles/32083755.pdf
    Data publikacji:
    2020-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    generalized Petersen graph
    Hamiltonian cycle
    partition number
    1-factor
    Opis:
    In this paper, we investigate the number of Hamiltonian cycles of a generalized Petersen graph $ P(N, k) $ and prove that $ \Psi(P(N,3)) \ge N \cdot \alpha_N $, where $ \Psi (P(N, 3)) $ is the number of Hamiltonian cycles of $P(N, 3)$ and $ \alpha_N $ satisfies that for any $ \epsilon > 0 $, there exists a positive integer $M$ such that when $ N > M $, $ ((1− \epsilon ) \frac{ (1−r^3) }{6r^3+5r^2+3) }( 1/r )^{N+2} < \alpha_N < ( (1+ɛ) \frac{ (1−r^3) }{6r^3+5r^2+3) }( 1/r )^{N+2} $, where $ 1/r = \text{max} \{ | \frac{1}{r_j} | : j=1,2,…,6 \} $, and each $ r_j $ is a root of equation $ x^6 + x^5 + x^3 − 1 = 0 $, $ r \approx 0.782 $. This shows that $ \Psi (P (N, 3) $ is exponential in $N$ and also deduces that the number of 1-factors of $ P(N, 3)$ is exponential in $N$.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2020, 40, 1; 297-305
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An effective hybrid method for analysis the large-scale reliability block diagram model
    Autorzy:
    Ping, Yashi
    Ren, Yi
    Li, Zhifeng
    Yang, Dezhen
    Yang, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/27312772.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    reliability block diagram
    structure identification
    plus structure
    binary decision diagram
    Opis:
    The reliability block diagram (RBD) is a graphical tool used for reliability modeling and analysis in various industries, including shipbuilding, aviation, and aerospace. Typically, RBDs are transformed into Bayesian networks for quantitative analysis of systems. Bayesian networks are probabilistic graphical models that can capture the uncertainties and causal relationships in complex systems. They can provide various reliability metrics such as failure probability, mean time to failure, availability, etc. However, these techniques have several drawbacks, especially for large-scale models, such as being extremely time and memory-consuming. To address these issues, we propose a hybrid method for quantitative analysis of large-scale RBDs based on the structure identification approach and binary decision diagrams. Theoretical analysis and case verification demonstrate that the proposed method is significantly more efficient than the current one.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 169408
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Noise Attenuation Characteristics of Hydrofoil with Specific Cavitation Number
    Autorzy:
    Xiaohui, He
    Zhongle, Liu
    Chao, Yang
    Zhiyong, Yuan
    Powiązania:
    https://bibliotekanauki.pl/articles/31339799.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sound pressure spectrum
    noise
    sound power spectrum
    numerical prediction
    Opis:
    In this study, the modified Sauer cavitation model and Kirchhoff-Ffowcs Williams and Hawkings (K-FWH) acoustic model were adopted to numerically simulate the unsteady cavitation flow field and the noise of a three-dimensional NACA66 hydrofoil at a constant cavitation number. The aim of the study is to conduct and analyze the noise performance of a hydrofoil and also determine the characteristics of the sound pressure spectrum, sound power spectrum, and noise changes at different monitoring points. The noise change, sound pressure spectrum, and power spectrum characteristics were estimated at different monitoring points, such as the suction side, pressure side, and tail of the hydrofoil. The noise characteristics and change law of the NACA66 hydrofoil under a constant cavitation number are presented. The results show that hydrofoil cavitation takes on a certain degree of pulsation and periodicity. Under the condition of a constant cavitation number, as the attack angle increases, the cavitation area of the hydrofoil becomes longer and thicker, and the initial position of cavitation moves forward. When the inflow velocity increases, the cavitation noise and the cavitation area change more drastically and have a superposition tendency toward the downstream. The novelty is that the study presents important calculations and analyses regarding the noise performance of a hydrofoil, characteristics of the sound pressure spectrum, and sound power spectrum and noise changes at different monitoring points. The article may be useful for specialists in the field of engineering and physics.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 359-372
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Investigation of the Propagation Characteristics of Surface Transverse Wave Considering Various Quartz Substrate and Electrode Configurations
    Autorzy:
    Jiang, Chao
    Cao, Xiaoli
    Yang, Feng
    Liu, Zejun
    Powiązania:
    https://bibliotekanauki.pl/articles/31339822.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    surface transverse wave
    STW
    interdigital transducer
    IDT
    finite element analysis
    FEA
    quartz
    Opis:
    Featured with a higher velocity, increased power handling capability, and better aging behavior, surface transverse wave (STW) shows more promising prospects than Rayleigh wave nowadays in various sensing applications. The need to design, optimize, and fabricate the related devices motivates the development of modeling and simulation. For this reason, a three-dimensional (3D) finite element (FE) simulation of STW on quartz, considering the crystal cut angle and the electrode effects, is presented in this study. Firstly, we investigated the effects of quartz’s cut angle on the generated waves. Here, the polarized displacements were analyzed to distinguish the wave modes. Secondly, the investigations of the electrode effects on the polarized displacement, phase velocity, and electromechanical coupling factor (K2) were carried out, for which different material and thickness configurations for the electrodes were considered. Thirdly, to examine the excitation conditions of the generated waves, the admittance responses were inspected. The results showed that not only the crystal cut angle but also the density and the acoustic impedance of the interdigital transducer (IDT) material have a strong influence on the excited waves. This article is the first to analyze STWs considering quartz’s cut angle and electrode effect through a 3D FE model. It could provide a helpful and easy way to design, optimize, and fabricate the related surface acoustic wave devices.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 403-412
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A genetic algorithm-based approach for flexible job shop rescheduling problem with machine failure interference
    Autorzy:
    Liang, Zhongyuan
    Zhong, Peisi
    Zhang, Chao
    Yang, Wenlei
    Xiong, Wei
    Yang, Shihao
    Meng, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/27320976.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    genetic algorithm
    rescheduling
    machine failure
    flexible job shop scheduling
    Opis:
    Rescheduling is the guarantee to maintain the reliable operation of production system process. In production system, the original scheduling scheme cannot be carried out when machine breaks down. It is necessary to transfer the production tasks in the failure cycle and replan the production path to ensure that the production tasks are completed on time and maintain the stability of production system. To address this issue, in this paper, we studied the event-driven rescheduling policy in dynamic environment, and established the usage rules of right-shift rescheduling and complete rescheduling based on the type of interference events. And then, we proposed the rescheduling decision method based on genetic algorithm for solving flexible job shop scheduling problem with machine fault interference. In addition, we extended the "mk" series of instances by introducing the machine fault interference information. The solution data show that the complete rescheduling method can respond effectively to the rescheduling of flexible job shop scheduling problem with machine failure interference.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 171784
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow and heat transfer characteristics of a novel airfoil-based tube with dimples
    Autorzy:
    Pei, Houju
    Liu, Meinan
    Yang, Kaijie
    Zhimao, Li
    Liu, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/2173696.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer enhancement
    airfoil-based tube
    dimple
    comprehensive performance
    wzmocnienie wymiany ciepła
    rura
    wgłębienie
    wykonanie kompleksowe
    Opis:
    The performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and 21,736. The velocity contour, temperature contour, and local streamlines are also presented to get an insight into the heat transfer enhancement mechanisms. The results show that both the velocity magnitude and flow direction change, and fluid dynamic vortexes are generated around the dimples, which intensify the flow mixing and interrupt the boundary layer, resulting in a better heat transfer performance accompanied by a certain pressure loss compared with the plain tube. The Nusselt number Nu of the airfoil-based tube increases with the increase of dimples number, relative depth, and Reynolds numbers, but the effect of cross-distribution angle can be ignored. Under geometric parameters considered, the airfoil-based tube with N = 6, H/D = 0.1, α = 0° and Re = 7,753 can obtain the largest average PEC value 1.23. Further, the empirical formulas for Nusselt number Nu and friction factor f are fitted in terms of dimple number N, relative depth H/D, and Reynolds number Re, respectively, with the errors within ± 5%. It is found that the airfoil-based tube with dimples has a good comprehensive performance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141984
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced effect of fine magnetite on the flotation performance of fine hematite in sodium oleate system
    Autorzy:
    Pei, Bin
    Luo, Ximei
    Yang, Wen
    Wei, Dayong
    Li, Chao
    Wang, Yunfan
    Powiązania:
    https://bibliotekanauki.pl/articles/2146908.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnetite
    hematite
    flotation
    magnetic aggregation
    Opis:
    In this work, the effect of magnetite with different particle sizes on the flotation performance of both coarse and fine hematite particles were investigated by using sodium oleate as a collector. The results showed that the magnetite particles with different particle sizes showed a negative effect on hematite (-106+45 μm) recovery, but the addition of magnetite with the same particle sizes as hematite during the direct flotation of -45 μm hematite was beneficial to improve the recovery of micro-fine hematite and the Fe grade of concentrate. The finer the magnetite particle was, the more obvious the agglomeration effect of hematite was. Therefore, the beneficial effect could be achieved by adjusting the particle sizes of particles. Moreover, sodium oleate was beneficial to promote the agglomeration of micro-fine magnetite and hematite. The results from the microscopic analysis, laser particle size analysis, and EDLVO calculation proved that there was an effective aggregation between fine magnetite and fine hematite particles, which increased the apparent size of hematite particles and the probability of the mineral particles adhering to bubbles, thus improving the hematite recovery.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149673
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of Al(III) and Fe(III) ions on the flotation behavior of Kfeldspar with sodium oleate as the collector
    Autorzy:
    Chen, Yi
    Zhou, Jikui
    He, Guichun
    Hu, Hongxi
    Liu, Chao
    Yang, Jiping
    Lyu, Xianjin
    Powiązania:
    https://bibliotekanauki.pl/articles/27323648.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    K-feldspar flotation
    aluminum ion
    iron ion
    sodium oleate
    action mechanism
    Opis:
    The present study investigates the effects and mechanisms of aluminum (Al(III)) and iron (Fe(III)) ions on the flotation efficiency of potassium feldspar (K-feldspar) within oleate collector systems. The study employs micro-flotation experiments, solution chemistry calculations, zeta potential measurements, and FT-IR and XPS analyses to demonstrate that Al(III) and Fe(III) ions can significantly improve the flotation recovery of K-feldspar by altering its surface charge, bonding properties, and adsorption modes. The study also develops adsorption models for the flotation of K-feldspar activated by Al(III) and Fe(III), revealing the synergistic impacts of metal ion hydrolysis products and sodium oleate in the formation of hydrophobic complexes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174724
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An association between cumulative exposure to light at night and the prevalence of hyperuricemia in steel workers
    Autorzy:
    Li, Xiaoming
    Xu, Xianghui
    Song, Yang
    Cui, Shiyue
    Xue, Chao
    Wang, Lihua
    Wu, Jianhui
    Yuan, Juxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2085783.pdf
    Data publikacji:
    2021-06-28
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    uric acid
    circadian rhythms
    hyperuricemia
    steel workers
    light at night
    restricted cubic spline
    Opis:
    ObjectivesExposure to light at night (LAN) can disturb circadian endocrine and metabolic rhythms. Hyperuricemia (HUA) is an early-onset metabolic disorder. However, it is still not clear whether LAN exposure increases the prevalence of HUA.Material and MethodsThe authors used crosssectional data on the Beijing-Tianjin-Hebei occupational populations cohort from March–July 2017. A total of 7664 steel workers were finally selected to investigate the relationship between LAN exposure and the prevalence of HUA among steel workers. The authors collected demographic and socio-economic data, as well as information on lifestyle factors, anthropometric measures, and laboratory tests. The restricted cubic spline method was used to analyze the dose-response relationship between cumulative LAN exposure and the prevalence of HUA. Logistic regression analyses were used to fit the relationship between them.ResultsThe average age of the participants was 43.5±8.6 years; 7051 (91.7%) of them were males, 2749 (35.9%) reported to suffer from HUA, and 1241 (16.2%) were not exposed to LAN. There was a significant non-linear dose-response relationship between them. After adjustment for the confounding factors, including demographic data, lifestyle factors, etc., the lower LAN exposure was significantly associated with HUA (0–1931.7 days, OR = 1.180, and the 95% CI: 1.000–1.394; 1931.7–4343 days, OR = 1.215, 95% CI: 1.035–1.426).ConclusionsThis study revealed that a certain amount of exposure to LAN is independently related to the prevalence of HUA in steel workers in China.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 3; 385-401
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of ethanol-assisted mixing on the selected properties and homogeneity of NR/BR blends
    Wpływ mieszania wspomaganego etanolem na wybrane właściwości i jednorodność mieszanek NR/BR
    Autorzy:
    Meng, Chao
    Gu, Zheng
    Sui, Jinyong
    Wang, Jianfa
    Li, Peiyao
    Hu, Shaokai
    Zhang, Susu
    Zhang, Xiaoyi
    Wang, Haoyu
    Han, Shaolong
    Yang, Zhifei
    Powiązania:
    https://bibliotekanauki.pl/articles/24202782.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    natural rubber
    butadiene rubber
    blends
    dispersion
    kauczuk naturalny
    kauczuk butadienowy
    mieszaniny
    dyspersja
    Opis:
    The effect of the mixing method (normal and ethanol-assisted) on selected properties of natural rubber with butadiene rubber blends (NR/BR 80/20) was investigated. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to evaluate the properties. In addition, the mechanical tensile properties, tear resistance and thermal aging, as well as vulcanization characteristic were determined. It was found that ethanol-assisted mixing can significantly improve the mechanical properties and thermal stability of the blends as a result of better dispersion of additives in the rubber matrix.
    Zbadano wpływ metody mieszania (tradycyjna i wspomagana etanolem) na wybrane właściwości mieszanin kauczuku naturalnego z kauczukiem butadienowym (NR/BR 80/20). Do oceny właściwości zastosowano skaningową mikroskopię elektronową (SEM), spektroskopię w podczerwieni z transformacją Fouriera (FTIR) oraz analizę termograwimetryczną (TGA). Ponadto oznaczono właściwości mechaniczne przy rozciąganiu, odporność na rozdzieranie i starzenie termiczne, a także właściwości wulkanizacyjne. Stwierdzono, że mieszanie wspomagane etanolem może znacząco poprawić właściwości mechaniczne i stabilność termiczną mieszanin NR/BR, jako efekt lepszej dyspersji dodatków w osnowie gumowej.
    Źródło:
    Polimery; 2023, 68, 3; 142--148
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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