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    Wyświetlanie 1-7 z 7
    Tytuł:
    A novel in-phase disposition SPWM pulse allocation strategy for cascaded H-bridge inverter
    Autorzy:
    Zhang, Y.
    Xiong, J.
    Kong, L.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/141155.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in-phase disposition SPWM
    Inverter
    CHB
    THD
    Opis:
    A novel in-phase disposition (IPD) SPWM pulse allocation strategy applied to a cascaded H-bridge (CHB) converter is presented in this paper. The reason causing the power of the CHB converter imbalance is analyzed according to the traditional structure, the conception of power imbalance degree is introduced and the principle of the novel in-phase disposition SPWM allocation strategy is deduced in detail. The new pulse allocation scheme can ensure the power balance in 3/4 cycles through interchanging the PWM pulse sequence of the different CHB cell, meanwhile it makes the full advantage of the IPD control strategy, lower the total harmonic distortion (THD) of line voltage compared to a carrier phase shifted (CPS) control strategy, which is verified by theoretical derivation. A seven-level cascaded inverter composed by three H-bridge cells is taken as the example. The simulation and experiment is performed. The results indicate the validity of the analysis and verify the effectiveness of the proposed SPWM allocation strategy.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 2; 361--375
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of chirped microwave signal with any central frequency based on a nonuniformly spaced finite impulse response filter
    Autorzy:
    Chen, D.
    Wang, R.
    Pu, T.
    Xiang, P.
    Fang, T.
    Zheng, J.
    Xiong, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174334.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microwave photonics
    microwave photonic filter
    chirped microwave signal
    dual drive Mach–Zehnder modulator
    Opis:
    A novel optical approach to generating a chirped microwave signal by using a nonuniformly spaced finite impulse response filter is proposed and demonstrated. In this scheme, a narrowband Gaussian pulse is used as the original chirped-free signal, which is easy to be acquired. To eliminate the need of a wideband chirped-free signal, a mixer and a radio frequency signal are used to up-convert the spectrum of the original Gaussian signal. Therefore, the required frequency response can be calculated and reconstructed by a finite impulse response filter with nonuniformly spaced taps. Besides, a dual drive Mach–Zehnder modulator is used to realize single sideband modulation of the chirpedfree signal. Thus, the transfer function induced by the fiber dispersion is eliminated and the chirped microwave signal with any central frequency can be generated. In this paper, a design example of a filter with a central frequency of 10GHz is provided, and generation of the target chirped microwave signal is also demonstrated by numerical simulations.
    Źródło:
    Optica Applicata; 2016, 46, 3; 399-408
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation on mining effects of upper coal seam on lower coal seam of splitting area of splitting and merging coal seam
    Symulacja numeryczna efektów wydobywania węgla w górnym pokładzie węgla na dolny pokład węgla na obszarze rozszczepienia w pokładzie o cechach rozszczepienia i scalania
    Autorzy:
    Zha, W. H.
    Hua, X. Z.
    Xiong, L. J.
    Huang, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/348696.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    rozszczepienie i scalanie
    naprężenia stropu
    prawo pęknięć
    symulacja numeryczna
    splitting and merging
    floor stress
    failure law
    numerical simulations
    Opis:
    The main mining coal seams 71 and 72 of Huaibei mine area show a relation between splitting and merging. Under the slicing mining circumstance of the splitting area, it is the key problem to face the mining area to ensure the safety of the lower 72 coal mining. Based on face 7225 of Xutuan Coal Mine the influence of 71 coal seam mining on the coal seam 72 was analyzed by the FLAC3D. The law of stress propagation in the floor, failure extent and movement during the mining of coal seam 71 and coal seam 72 were studied by the numerical simulation; it provides the basis for roof management and support selection of 72 coal seam mining.
    Główne pokłady węglowe nr 71 i 72 kopalni Huaibei wykazują cechy zarówno rozszczepienia, jak i scalania. Podczas wybierania warstwowego na obszarze rozszczepienia głównym problemem jest zapewnienie bezpieczeństwa dolnego pokładu nr 72. Na przykładzie przodka 7225 kopalni Xutuan przeanalizowano wpływ wydobycia w pokładzie nr 71 na pokład nr 72 przy użyciu programu FLAC3D. Propagację fal naprężeń w spągu, zakres pęknięcia i przesunięcia podczas wybierania pokładu węgla nr 71 i 72 zbadano za pomocą symulacji numerycznej, co daje podstawy do lepszej kontroli stropu i do wyboru obudowy pod wybieranie pokładu węgla nr 72.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 3; 471-479
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk of the maritime supply chain system based on interpretative structural model
    Autorzy:
    He, J.
    Xiong, W.
    Cao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/258536.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    interpretative structural mode
    maritime supply chain risk
    system structure
    Opis:
    Marine transportation is the most important transport mode of in the international trade, but the maritime supply chain is facing with many risks. At present, most of the researches on the risk of the maritime supply chain focus on the risk identification and risk management, and barely carry on the quantitative analysis of the logical structure of each influencing factor. This paper uses the interpretative structure model to analysis the maritime supply chain risk system. On the basis of comprehensive literature analysis and expert opinion, this paper puts forward 16 factors of maritime supply chain risk system. Using the interpretative structure model to construct maritime supply chain risk system, and then optimize the model. The model analyzes the structure of the maritime supply chain risk system and its forming process, and provides a scientific basis for the controlling the maritime supply chain risk, and puts forward some corresponding suggestions for the prevention and control the maritime supply chain risk.
    Źródło:
    Polish Maritime Research; 2017, S 3; 28-33
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A conceptual model of excellent performance mode of port enterprise logistics management
    Autorzy:
    He, J.
    Xiong, W.
    Cao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/260102.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    port enterprises
    performance excellence model
    logistics management
    Opis:
    Port as one of the key hubs of international logistics, which has become the main part and the base of global logistics management. The port enterprises, plays an important role in the global supply chain. However, due to the lack of understanding in port supply chain management, coordination between the port enterprises, the integration of business process is not perfect, the lack of information sharing between various organizations, ports enterprises usually failed to fully play its positive role. Based on this, the paper makes the port enterprises as the research object, and introduces the excellent performance mode into the port enterprises. In order to study the port enterprises how to carry out effective quality management, and formation the coordination and integration of upstream and downstream of enterprises, so as to realize the competitive advantage in port logistics.
    Źródło:
    Polish Maritime Research; 2017, S 3; 34-40
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scale effect of cement mortar specimens subjected to high temperatures using uniaxial compressive and splitting tensile tests
    Autorzy:
    Xiong, L. X.
    Zhang, X. J.
    Xu, Z. Y.
    Geng, D. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/230921.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zaprawa cementowa
    temperatura wysoka
    ściskanie jednoosiowe
    rozciąganie przy rozłupywaniu
    efekt skali
    cement mortar
    high temperature
    uniaxial compression
    splitting tensile
    scale effect
    Opis:
    In this study, cubic and cylindrical cement mortar specimens were first subjected to high temperatures, then the cubic and cylindrical specimens were taken out and conducted with uniaxial compressive test and splitting tensile test, respectively. The effect of the length to side ratio on the uniaxial compressive properties and the effect of thickness-to-diameter ratio on the splitting tensile properties of cement mortar specimens after high temperature were studied. Test results show that: (1) With temperature increasing from 25 ºC (room temperature) to 400 ºC, the compressive strength and elastic modulus of cubic specimens with three kinds of side lengths decrease; the decreasing rates of compressive strength and elastic modulus of cubic specimen with side length of 70.7 mm is higher than those of cubic specimens with side length of 100 mm and 150 mm, and the strain at the peak stress of cubic specimens with three kinds of side lengths increase. (2) After the same temperature, the tensile strength of cylindrical specimen decreases with the thickness-to-diameter ratio increasing from 0.5 to 1.0. The decreasing rate of tensile strength of cylindrical specimen with thickness-to-diameter ratio is highest when the temperature is 25 ºC (room temperature), followed by that after the temperature of 200 ºC, and that after the temperature of 400 ºC is the lowest.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 139-155
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical study of the uniaxial compressive stress-strain relationship of a rock mass with two parallel joints
    Autorzy:
    Xiong, L. X.
    Yuan, H. Y.
    Zhang, Y.
    Zhang, K. F.
    Li, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/231076.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa skalna łączona
    złącze równoległe
    siła szczytowa
    jointed rock mass
    parallel joint
    peak strength
    Opis:
    A “rock bridge”, defined as the closest distance between two joints in a rock mass, is an important feature affecting the jointed rock mass strength. Artificial jointed rock specimens with two parallel joint fractures were tested under uniaxial compression and numerical simulations were carried out to study the effects of the inclination of the rock bridge, the dip angle of the joint, rock bridge length, and the length of joints on the strength of the jointed rock mass. Research results show: (1) When the length of the joint fracture, the length of the rock bridge, and the inclination of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually increases as the inclination of the joint fracture increases from 0° to 90°. (2) When the length of the joint fracture, the length of the rock bridge, and the inclination of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen shows variations in trends with the inclination of the rock bridge increasing from 30° to 150° (3). In the case when the joint is angled from the vertical loading direction, when the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually decreases with an increasing length of joint fracture. When the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen does not show a clear trend with an increase of the length of the rock bridge.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 2; 67-80
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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