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    Wyświetlanie 1-11 z 11
    Tytuł:
    Nonmetrizable topological dynamical characterization of central sets
    Autorzy:
    Shi, Hong-Ting
    Yang, Hong-Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/1205493.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    topological dynamical system
    enveloping semigroup
    uniform recurrence
    proximality
    minimal idempotent
    central subset
    Opis:
    Without the restriction of metrizability, topological dynamical systems $(X,⟨ T_s⟩_{s ∈ G})$ are defined and uniform recurrence and proximality are studied. Some well known results are generalized and some new results are obtained. In particular, a topological dynamical characterization of central sets in an arbitrary semigroup (G,+) is given and shown to be equivalent to the usual algebraic characterization.
    Źródło:
    Fundamenta Mathematicae; 1996, 150, 1; 1-9
    0016-2736
    Pojawia się w:
    Fundamenta Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal performance analysis of manned airships in a thermally variable environment
    Autorzy:
    Shi, Hong
    Liu, Meinan
    Chen, Jiamin
    Zou, Yitao
    Powiązania:
    https://bibliotekanauki.pl/articles/2173708.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    manned airship
    thermal performance
    nacelle
    temperature difference
    flight position
    sterowiec załogowy
    wydajność cieplna
    gondola
    różnica temperatur
    pozycja lotu
    Opis:
    The safety and reliability of the manned airship depend to a considerable extent on its thermal performance. In this paper, heat balance equations are developed and solved in the C++ programming language. The temperature variation of the enclosure, gasbag, and nacelles of the manned airship is investigated. In addition, the effects of season, latitude, and orientation on the thermal performance of the manned airship and the airship nacelle are investigated. The results show that: (1) The average temperature difference of the nacelle surface at the same time is 25 K, while the maximum temperature difference in the nacelle is 29 K during the day, (2) the temperature distribution in the nacelle is similar in spring and autumn, with maximum temperature between 306 K and 309 K. The maximum temperature in the nacelle is between 300 K and 303 K in winter while the maximum temperature in the nacelles is between 309 K and 315 K in summer, (3) as the flight position of the manned airship changes from 20°N to 60°N, the average nacelle temperature varies slightly by about 1 K. However, as the latitude increases, the high- temperature region shifts from the bottom of the nacelle to the side of the nacelle, and (4) the temperature distribution of the upper envelope of the airship varies considerably with orientation. However, the average temperature of the nacelle is less impacted by orientation. These results are useful for understanding the thermal performance of manned airships.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e143105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of the ejection cooling mechanism of ventilation for a marine gas turbine enclosure
    Autorzy:
    Shi, Hong
    Zhang, Qianwei
    Liu, Meinan
    Yang, Kaijie
    Yuan, Jie
    Powiązania:
    https://bibliotekanauki.pl/articles/32908258.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    gas turbine enclosure
    ejecting cooling
    ventilation
    CFD
    Opis:
    A marine gas turbine enclosure must be designed to prevent overheating of the electrical and engine control components as well as diluting potential fuel leaks. In order to achieve an optimal enclosure design, a numerical study of the ventilation-ejection cooling mechanism of a gas turbine enclosure is carried out in this paper. The evaluation index of the ejection cooling performance is first proposed and the algorithm of numerical simulation is verified. On this basis, orthogonal combinations of structural parameters are carried out for the expansion angle α of the lobed nozzle and the spacing S between the outlet plane of the lobed nozzle and the inlet plane of the mixing tube. The flow and the temperature distribution inside the enclosure are analysed under different operating conditions. The results show that the influence of the lobed nozzle expansion angle α and the spacing S on the performance is not a single-valued function but the two influencing factors are mutually constrained and influenced by each other. For any spacing, the combined coefficient is optimal for the expansion angle α = 30°. When the expansion angle α = 45° and the spacing S = 100 mm, the combined coefficient and the temperature distribution inside the enclosure are optimal at the same time.
    Źródło:
    Polish Maritime Research; 2022, 3; 119-127
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-objective optimization of PCM-fin structure for staggered Li-ion battery packs
    Autorzy:
    Qiu, Chenghui
    Wu, Chongtian
    Yuan, Xiaolu
    Wu, Linxu
    Yang, Jiaming
    Shi, Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/27311457.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    staggered arrangement
    phase change material
    fin
    multi-objective optimization
    thermal management
    entropy weight
    TOPSIS method
    technique for order of preference by similarity to ideal solution
    układ naprzemienny
    materiał o przemianie fazowej
    materiał zmieniający fazę
    płetwa
    optymalizacja wielocelowa
    optymalizacja wieloobiektowa
    zarządzanie ciepłem
    entropia wagi
    metoda TOPSIS
    technika porządkowania preferencji według podobieństwa do idealnego rozwiązania
    Opis:
    Endurance capability is a key indicator to evaluate the performance of electric vehicles. Improving the energy density of battery packs in a limited space while ensuring the safety of the vehicle is one of the currently used technological solutions. Accordingly, a small space and high energy density battery arrangement scheme is proposed in this paper. The comprehensive performance of two battery packs based on the same volume and different space arrangements is compared. Further, based on the same thermal management system (PCM-fin system), the thermal performance of staggered battery packs with high energy density is numerically simulated with different fin structures, and the optimal fin structure parameters for staggered battery packs at a 3C discharge rate are determined using the entropy weight-TOPSIS method. The result reveals that increasing the contact thickness between the fin and the battery (X) can reduce the maximum temperature, but weaken temperature homogeneity. Moreover, the change of fin width (A) has no significant effect on the heat dissipation performance of the battery pack. Entropy weight-TOPSIS method objectively assigns weights to both maximum temperature (Tmax) and temperature difference (DT) and determines the optimal solution for the cooling system fin parameters. It is found that when X = 0:67 mm, A = 0:6 mm, the staggered battery pack holds the best comprehensive performance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145677
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of Multi-Response Surface Parameters of the Roving Twist Factor and Spinning Back Zone Draft
    Zastosowanie metody wielokrotnej odpowiedzi do optymalizacji parametrów technologicznych procesu przędzenia
    Autorzy:
    Hong, Cui
    Chen, Shi
    Powiązania:
    https://bibliotekanauki.pl/articles/234040.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    twist factor
    back zone draft
    multi-response surface
    orthogonal experiment
    3D surface graph
    współczynnik skrętu
    zanurzenie strefy tylnej
    powierzchnia wielokrotnej odpowiedzi
    eksperyment ortogonalny
    wykres powierzchniowy 3D
    Opis:
    In order to obtain the optimal collocation of two important technological parameters in the spinning process, the multi-response surface method was used to optimise the experimental results. Through the orthogonal design of the two factors and four levels of factor encoding, 16 groups of orthogonal experiments were designed; the experimental results were fit using the curve fitting toolbox of Matlab; a regression equation of yarn quality indicators, and in addition to a three-dimensional surface chart, an optimal scheme of the roving twist factor and spinning drafting for a roving twist factor of 110 were established; a spinning back draft of 1.5 was obtained based on experimental results of the response surface analysis and variance regression analysis. Experiments on the optimal scheme were carried out to verify the practicability of the results obtained by this method. The results show that application of the multiple response surface method to the optimisation of process parameters is of practical significance. This method can be applied for the optimisation of other process parameters.
    Aby uzyskać optymalną kolokację dwóch ważnych parametrów technologicznych w procesie przędzenia, do optymalizacji wyników eksperymentalnych zastosowano metodę wielu odpowiedzi. Poprzez ortogonalne zaprojektowanie dwóch czynników i czterech poziomów kodowania czynnikowego zaprojektowano 16 grup eksperymentów ortogonalnych. Wyniki eksperymentalne dopasowano przy użyciu Matlab. Przeprowadzono eksperymenty na optymalnym schemacie w celu sprawdzenia wyników uzyskanych tą metodą. Wyniki pokazały, że zastosowanie metody powierzchni wielokrotnej odpowiedzi do optymalizacji parametrów procesu ma znaczenie praktyczne. Tę metodę można zastosować do optymalizacji innych parametrów procesu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 5 (137); 28-33
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An improved air supply scheme for battery energy storage systems
    Autorzy:
    Xinlong, Zhu
    Hong, Shi
    Wenbing, Xu
    Tong, Zhang
    Yansong, Wang
    Powiązania:
    https://bibliotekanauki.pl/articles/2173643.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    battery energy storage system
    BESS
    air cooling duct
    baffles
    akumulatorowy system magazynowania energii
    kanał chłodzący powietrze
    przegrody
    Opis:
    The overall efficiency of battery energy storage systems (BESSs) strongly depends on the temperature uniformity of the batteries, usually disregarded in studies of the integrated performance of BESSs. This paper presents a new battery thermal management system (BTMS) using a personalized air supply instead of a central air supply. Thermal models are established to predict the thermal behavior of BESSs with 400 battery packs. Moreover, several optimizations comprising the effect of the position and number of air inlets, the number, and angle of the baffles on the air distribution in the ducts are proposed. The results show that the distributed air supply from the main air inlet makes the air velocity in the main air ducts more uniform. It is demonstrated that air deflection is the main source of airflow inhomogeneity at the air outlets. The airflow uniformity is better when the baffles are added at the entrance and the bottom of each riser duct than at other locations. The improved air supply scheme makes the nonuniformity coefficient of air velocity reduced from 1.358 to 0.257. The findings can guide the selection of a cooling form to enhance the safety of BESSs.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140692
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Threshold effect of economic growth on domestic waste production : evidence from China
    Autorzy:
    Yang, Li
    Wang, Hong-Yan
    Yi, Lan
    Shi, Xiang-Zhen
    Deng, Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/2203127.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    domestic waste
    per capita GDP
    source reduction
    panel threshold regression model
    Opis:
    Since the implementation of the compulsory sorting of domestic waste policy in China, the participation rate of residents is low, which leads to the unsatisfactory result of terminal reduction of domestic waste. Therefore, the problem of domestic waste reduction still needs to rely on source reduction. Based on the panel data of 29 provincial capitals in China from 2009 to 2018, this study conducts a comprehensive threshold effect test on per capita GDP and other influencing factors of domestic waste production, conducts panel threshold regression for the factors with threshold value, and explores the nonlinear relationship between per capita GDP and domestic waste production under the influence of different threshold variables. The results show that when the urban population density is less than 272 people/km2, the increase of 1% of per capita GDP will lead to a decrease of 0.251% in the domestic waste production, otherwise, it will lead to an increase of 0.249%; when the per capita consumption expenditure is less than the threshold value of 10,260 yuan/year, the influence coefficient of per capita GDP is 0.155, which increases to 0.207 above the threshold. When the share of tertiary industry is taken as the threshold variable, the two threshold values are 61% and 71% respectively. Through the analysis of control variables, it has been found that population size and amount of courier per capita have significant positive effects on domestic waste production, while gas permeability and the number of non-governmental organizations have significant negative effects.
    Źródło:
    Archives of Environmental Protection; 2022, 48, 4; 13--24
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Broadband convolutional scattering characteristics of all dielectric transmission Pancharatnam–Berry geometric phase metasurfaces
    Autorzy:
    Li, Yiyun
    Jin, Yongxing
    Jing, Xufeng
    Shi, Lijiang
    Li, Chenxia
    Hong, Zhi
    Powiązania:
    https://bibliotekanauki.pl/articles/2086765.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    grating
    metasurface
    optical device
    Opis:
    In order to obtain the broadband scattering characteristics, we propose a superperiodic cell structure with all-dielectric material to construct Pancharatnam–Berry geometric phase encoding metasurfaces. Because we cannot design or prepare infinitesimal coding unit particles, according to the generalized Snell’s law, we can only obtain discrete scattering angle regulation for the basic coding metasurface sequence. In order to obtain multi-angle scattering characteristics, we introduce the Fourier convolution principle in digital signal processing on the Pancharatnam–Berry geometric phase encoding metasurfaces. By using the addition and subtraction operations on two encoding metasurface sequences, a new encoding metasurface sequence can be obtained with different deflection angle. Fourier convolution operations on the encoding metasurfaces can provide an efficient method in optimizing encoding patterns to achieve continuous scattering beams. The addition and subtraction methods are also applicable to the checkerboard coding mode. The combination of Fourier convolution principle and Pancharatnam–Berry phase coded metasurface in digital signal processing can realize more powerful electromagnetic wave manipulation capability.
    Źródło:
    Optica Applicata; 2022, 52, 2; 297--323
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of the roof behaviors and mine pressure manifestations during the mining of steep coal seam
    Charakterystyki zachowań materiału skalnego i wzrosty ciśnienia w trakcie urabiania złóż węgla o dużym nachyleniu
    Autorzy:
    Hong-Sheng, T.
    Shi-Hao, T.
    Cun, Z.
    Lei, Z.
    Xiao-Gang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/219018.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wyrobiska o dużym nachyleniu
    symulacje
    ciśnienie
    podsadzka ze skały płonnej
    układ belki klińcowej
    steep coal seam
    similar simulation
    mining pressure
    gangue backfilling
    “voussoir beam” structure
    Opis:
    A steep seam similar simulation system was developed based on the geological conditions of a steep coal seam in the Xintie Coal Mine. Basing on similar simulation, together with theoretical analysis and field measurement, an in-depth study was conducted to characterize the fracture and stability of the roof of steep working face and calculate the width of the region backfilled with gangue in the goaf. The results showed that, as mining progressed, the immediate roof of the steep face fell upon the goaf and backfilled its lower part due to gravity. As a result, the roof in the lower part had higher stability than the roof in the upper part of the working face. The deformation and fracture of main roof mainly occurred in the upper part of the working face; the fractured main roof then formed a “voussoir beam” structure in the strata’s dip direction, which was subjected to the slip- and deformation-induced instability. The stability analysis indicated that, when the dip angle increased, the rock masses had greater capacity to withstand slip-induced instability but smaller capacity to withstand deformation-induced instability. Finally, the field measurement of the forces exerted on the hydraulic supports proved the characteristics of the roof’s behaviors during the mining of a steep seam.
    Opracowano układ do symulacji urabiania złóż węgla o dużym nachyleniu w oparciu o warunki geologiczno-górnicze w kopalni węgla Xintie. W oparciu o wyniki podobnych symulacji, analiz teoretycznych i pomiarów terenowych określono skalę spękań skał stropowych nad stromo nachylonym wyrobiskiem oraz stabilność skała stropowych, a także obliczono szerokość obszaru w zrobach podsadzanego skałą płonną. Wyniki badań wskazały, że wraz z postępem prac wydobywczych, strop bezpośredni ponad stromym wyrobiskiem obsunął się do zrobów wskutek działania sił ciężkości, wypełniając ich dolną część. W rezultacie, strop w niższej części wyrobiska wykazywał lepszą stabilność niż skały stropowe w jego górnej części. Odkształcenia i pęknięcia stropu zasadniczego zarejestrowano głównie w górnych partiach wyrobiska, spękany strop zasadniczy utworzył tam układ belki klińcowej nachylonej w kierunku upadowej, niestabilny pod wpływem uskoku i wskutek oddziałujących deformacji. Analiza stabilności stropu wykazała, że wraz ze wzrostem kąta nachylenia, wzrasta wytrzymałość górotworu na niestabilność wskutek obsuwania się w kierunku nachylenia, z kolei maleje jego wytrzymałość na oddziaływania odkształceń. Ponadto, wykonane pomiary sił działających na podpory hydrauliczne potwierdziły wzorce zachowania się górotworu w trakcie prac wydobywczych w złożach o dużym nachyleniu.
    Źródło:
    Archives of Mining Sciences; 2017, 62, 4; 871-891
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Critical Sizes for Detonation of Cube-shaped Transfer Charges
    Autorzy:
    Zhao, Xiang-run
    Jin, Shi-xin
    Huang, Jin-hong
    Li, Chao-zhen
    Yan, Li-wei
    Powiązania:
    https://bibliotekanauki.pl/articles/358353.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    explosive train
    transfer charge
    shock wave sensitivity
    minimum safe separation distance
    Opis:
    In order to obtain the minimum size, thickness and safe separation distance, for the cube-shaped transfer charges used in MEMS (micro-electromechanical system) explosive trains, an explosive train using a JO-9C(III) cube-shaped transfer charge was designed for experimental research. Detonation transfer experiments and detonation interruption experiments were conducted in turn. In initial experiments, the electric detonators were all in the armed position, but different thicknesses of the cube-shaped transfer charges were used. In the later experiments, the thickness of the transfer charges were unchanged, but the separation distances were different. The detonation path of the transfer charge under unsafe conditions was analyzed using the shock wave attenuation law. The results showed that the minimum thickness ranged from 0.2 mm to 0.4 mm, the minimum safe separation distance ranged from 0.4 mm to 0.6 mm; and the cube-shaped transfer charge is detonated by a shock wave from a steel gap rather than air clearance when the safe separation distance is less than the minimum threshold. The thickness design value of the cube-shaped transfer charge (JO-9C(III)) should not be less than 0.6 mm, and the safe separation distance design value of the MEMS explosive train should not be less than 1 mm.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 1; 91-104
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of differential serum expression of three factors and pulmonary function in patients with silicosis
    Autorzy:
    Zhu, Ying
    Duan, Xia Yu
    Cheng, Yun Qi
    Yao, Xin Jing
    Xu, Hong
    Zhang, Kui Sheng
    Li, Feng Shi
    Yang, Fang
    Liu, Liang He
    Yuan, Xiang Ju
    Powiązania:
    https://bibliotekanauki.pl/articles/2086531.pdf
    Data publikacji:
    2021-08-05
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    silicosis
    pulmonary function
    early diagnosis
    ROC
    PTPN2
    factor B
    Opis:
    ObjectivesSilicosis is a chronic occupational lung disease. As was previously found by the authors, some proteins increased in the lung tissue of activated rats, and protein tyrosine phosphatase non-receptor type 2 (PTPN2), factor B, and vaccinia-related kinase 1 (VRK1) showed highly differential expressions.Material and MethodsIn this study, serum and bronchoalveolar lavage fluid samples were collected from patients with silicosis and healthy people to verify the expression of PTPN2, factor B, and VRK1. The diagnostic value of differentially expressed proteins for silicosis was judged.ResultsThe expression levels of serum PTPN2, VRK1, and factor B in patients with silicosis were significantly higher than those in the control group (p < 0.01). Higher serum PTPN2 and factor B concentrations significantly and negatively correlated with the ratio of forced expiratory volume in 1 s to forced vital capacity (FEV1/FVC), maximum vital capacity (VCmax), FEV1, and FVC, suggesting that the high expression of PTPN2 and factor B is associated with decreased pulmonary ventilation function and restrictive ventilatory impairment in patients with silicosis. All area under curve (AUC) measurements generated from single detection events were >0.744, with PTPN2 reaching the highest value (0.858). The AUC, sensitivity, and specificity for the combined diagnosis using factor B and PTPN2 were 0.907, 86.91% and 85.07%, respectively, for factor B and PTPN2. The 3 differentially expressed proteins are potential classes of predictive biomarkers for silicosis.ConclusionsRegarding the economy and test practicality, the best diagnostic combination is factor B and PTPN2 for the analysis of AUC, sensitivity and specificity.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 4; 527-540
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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