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    Wyświetlanie 1-14 z 14
    Tytuł:
    Heuristic energy-saving virtual network embedding algorithm based on Katz centrality
    Autorzy:
    Zhu, Qiang
    Wang, Qing-Jun
    Zang, Mu-Jun
    Wang, Zhen-Dong
    Xiao, Chang
    Powiązania:
    https://bibliotekanauki.pl/articles/141679.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy-saving virtual network
    integer linear programming
    Katz centrality
    network virtualization embedding
    virtualization
    Opis:
    Current networks are designed for peak loads leading to low utilization of power resources. In order to solve this problem, a heuristic energy-saving virtual network embedding algorithm based on the Katz centrality (Katz-VNE) is proposed. For solving an energy-saving virtual network embedding problem, we introduce the Katz centrality to represent the node influence. In order to minimize the energy consumption of the substrate network, the energy-saving virtual network embedding problem is formulated as an integer linear program, and the Katz-VNE is used to solve this problem. The Katz-VNE tries to embed the virtual nodes onto the substrate nodes with high Katz centrality, which is effective, and uses the shortest paths offering the best factor of bandwidths to avoid the hot nodes. The simulation results demonstrate that the long-term average energy consumption of the substrate network is reduced significantly, and the long-term revenue/cost ratio, the acceptance rate of virtual network requests, and the hibernation rate of substrate nodes as well as links are improved significantly.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 595-608
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error analysis of the three-phase electrical energy calculation method in the case of voltage-loss failure
    Autorzy:
    Cheng, Han-miao
    Wang, Zhong-dong
    Cai, Qi-xin
    Lu, Xiao-quan
    Gao, Yu-xiang
    Song, Rui-peng
    Tian, Zheng-qi
    Mu, Xiao-xing
    Powiązania:
    https://bibliotekanauki.pl/articles/221096.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-phase electrical energy meter
    voltage-loss failure
    voltage substitution
    three-phase voltage unbalance
    calculation error
    Opis:
    The single-phase voltage loss is a common fault. Once the voltage-loss failure occurs, the amount of electrical energy will not be measured, but it is to be calculated so as to protect the interest of the power supplier. Two automatic calculation methods, the power substitution and the voltage substitution, are introduced in this paper. Considering the lack of quantitative analysis of the calculation error of the voltage substitution method, the grid traversal method and MATLAB tool are applied to solve the problem. The theoretical analysis indicates that the calculation error is closely related to the voltage unbalance factor and the power factor, and the maximum calculation error is about 6% when the power system operates normally. To verify the theoretical analysis, two three-phase electrical energy metering devices have been developed, and verification tests have been carried out in both the lab and field conditions. The lab testing results are consistent with the theoretical ones, and the field testing results show that the calculation errors are generally below 0.2%, that is correct in most cases.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 505-516
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Synthesis of Lithium Carbonate (Li2CO3) from Waste Acidic Sludge
    Autorzy:
    Choi, Dong Hyeon
    Wang, Jei-Pil
    Powiązania:
    https://bibliotekanauki.pl/articles/351124.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithium carbonate
    thermogravimetric apparatus
    lithium sulfate
    carbon dioxide
    Opis:
    In this study, the synthesis of lithium carbonate (Li2 CO3 ) powder was conducted by a carbonation process using carbon dioxide gas (CO2 ) from waste acidic sludge based on sulfuric acid (H2 SO4 ) containing around 2 wt.% lithium content. Lithium sulfate (Li2 SO4 ) powder as a raw material was reacted with CO2 gas using a thermogravimetric apparatus to measure carbonation conditions such as temperature, time and CO2 content. It was noted that carbonation occurred at a temperature range of 800°C to 900°C within 2 hours. To prevent further oxidation during carbonation, calcium sulfate (CaO4 S) was first introduced to mixing gases with CO2 and Ar and then led to meet in the chamber. The lithium carbonate obtained was examined by inductively coupled plasma–mass spectroscopy (ICP-MS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and it was found that of lithium carbonate with a purity above 99% was recovered.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1351-1355
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea ice regime in the Kara Sea during 2003–2017 based on high-resolution satellite data
    Autorzy:
    Duan, Chenglin
    Dong, Sheng
    Wang, Zhifeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2041857.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    ice regime
    spatio-temporal variation
    ice coverage anomaly index
    atmospheric forcing factor
    correlation analysis
    Źródło:
    Polish Polar Research; 2019, 40, 3; 205-225
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave characteristics and wave energy assessment in the Barents Sea
    Autorzy:
    Duan, Chenglin
    Wang, Zhifeng
    Dong, Sheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2042139.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Barents Sea
    ERA-Interim
    sea ice
    surface waves
    spatio-temporal variation
    Źródło:
    Polish Polar Research; 2018, 39, 1; 145-164
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic characteristics of underframe semi-active inerter-based suspended device for high-speed train based on LQR control
    Autorzy:
    Wang, Yong
    Li, Hao-Xuan
    Meng, Hao-Dong
    Wang, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/2173695.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic characteristics
    high-speed train
    inerter-based suspended device
    LQR control
    Sperling index
    charakterystyka dynamiczna
    pociąg dużych prędkości
    aktywne zawieszenie na bazie inertera
    kontrola LQR
    indeks Sperlinga
    Opis:
    The underframe passive inerter-based suspended device, based on the inerter-spring-damper vibration attenuation structure, could improve the dynamic performance of the train body, but its parameters are fixed and cannot meet the dynamic performance requirements under different operating conditions. Therefore, a semi-active inerter-based suspended device based on the linear quadratic regulator (LQR) control strategy is proposed to further enhance the dynamic performance. The rigid-flexible coupling vertical dynamic model of the train body and an underframe semi-active inerter-based suspended device are established. The structural parameters of the semi-active inerter-based suspended device are adjusted using LQR control strategy. Dynamic response of the system is obtained using the virtual excitation method. The dynamic characteristic of the system is evaluated using the Sperling index and compared with those of the passive and semi-active traditional suspended devices as well as the passive inerter-based suspended devices. The vertical vibration acceleration of the train body and Sperling index using the semi-active inerter-based suspended device is the smallest among the four suspended devices, which denotes the advantages of using the inerter and LQR control strategy. The semi-active inerter-based suspended device could decrease the vertical vibration acceleration of the train body and further suppress its elastic vibration in the lower frequency band, more effectively than the other three suspended devices. Overall, the semi-active inerter-based suspended device could significantly reduce elastic vibration of the train body and improve its dynamical performance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141722
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of small uav position and attitude with reliable in-flight initial alignment for MEMS inertial sensors
    Autorzy:
    Wang, D.
    Dong, Y.
    Li, Q.
    Wu, J.
    Wen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/221716.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MEMS
    INS
    GNSS
    in-flight alignment
    unmanned aerial vehicle
    Opis:
    The advance of MEMS-based inertial sensors successfully expands their applications to small unmanned aerial vehicles (UAV), thus resulting in the challenge of reliable and accurate in-flight alignment for air-borne MEMS-based inertial navigation system (INS). In order to strengthen the rapid response capability for UAVs, this paper proposes a robust in-flight alignment scheme for airborne MEMS-INS aided by global navigation satellite system (GNSS). Aggravated by noisy MEMS sensors and complicated flight dynamics, a rotation-vector-based attitude determination method is devised to tackle the in-flight coarse alignment problem, and the technique of innovation-based robust Kalman filtering is used to handle the adverse impacts of measurement outliers in GNSS solutions. The results of flight test have indicated that the proposed alignment approach can accomplish accurate and reliable in-flight alignment in cases of measurement outliers, which has a significant performance improvement compared with its traditional counterparts.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 603-616
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the EV charging load estimation and mode optimization methods
    Autorzy:
    Zhan, Zhiyan
    Dong, Kailang
    Pang, Xiaochen
    Zhao, Hongfei
    Wang, Aifang
    Powiązania:
    https://bibliotekanauki.pl/articles/141614.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EVs
    gap optimization
    Latin hypercube sampling
    Monte Carlo simulatino
    Opis:
    With the increasing number of electric vehicles (EVs), the disordered charging of a large number of EVs will have a large influence on the power grid. The problems of charging and discharging optimization management for EVs are studied in this paper. The distribution of characteristic quantities of charging behaviour such as the starting time and charging duration are analysed. The results show that charging distribution is in line with a logarithmic normal distribution. An EV charging behaviour model is established, and error calibration is carried out. The result shows that the error is within its permitted scope. The daily EV charge load is obtained by using the Latin hypercube Monte Carlo statistical method. Genetic particle swarm optimization (PSO) is proposed to optimize the proportion of AC 1, AC 2 and DC charging equipment, and the optimal solution can not only meet the needs of users but also reduce equipment investment and the EV peak valley difference, so the effectiveness of the method is verified.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 831-842
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expression of follicle-stimulating hormone receptor (FSHR), protein kinase B-2 (AKT2) and adapter protein with PH domain, PTB domain, and leucine zipper (APPL1) in pig ovaries
    Autorzy:
    Ning Zhou
    Ning Wang
    Xiang Qin
    Qian Liu
    Juhua Wang
    Hui Dong
    Jie Zhou
    Fugui Fang
    Powiązania:
    https://bibliotekanauki.pl/articles/2087861.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pigs
    immunohistochemistry
    FSHR
    AKT2
    APPL1
    Źródło:
    Polish Journal of Veterinary Sciences; 2017, 4; 661-667
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emergence and complete genome of Senecavirus A in pigs of Henan Province in China, 2017
    Autorzy:
    Wang, H.B.
    Tian, B.
    Lv, H.L.
    Wang, F.
    Zhang, T.
    Wang, C.Y.
    Zhang, Y.D.
    Dong, J.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087575.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Senecavirus A
    vesicular disease
    phylogenetic analysis
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 1; 187-190
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Recovery of Lithium and Ni/Co oxide from Cathode Active Powder of End-of-Life NCA(LiNiCoAlO2) Battery
    Autorzy:
    Shin, Shun-Myung
    Shin, Dong-Ju
    Joo, Sung-Ho
    Wang, Jei-Pil
    Powiązania:
    https://bibliotekanauki.pl/articles/352178.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cathode active powder
    NCA(LiNiCoAlO2)
    Li2CO3
    nickel oxide
    cobalt oxide
    Opis:
    This study was attempted to study for recovery of Li as Li2CO3 from cathode active material, especially NCA (LiNiCoAlO2), recovered from spent lithium ion batteries. This consists of two major processes, carbonation using CO2 and water leaching. Carbonation using CO2 was performed at 600ºC, 700ºC and 800ºC, and NCA (LiNiCoAlO2) was phase-separated into Li2CO3, NiO and CoO. The water leaching process using the differences in solubility was performed to obtain the optimum conditions by using the washing time and the ratio of the sample to the distilled water as variables. As a result, NCA (LiNiCoAlO2) was phase-separated into Li2CO3 and NiO, CoO at 700ºC, and Li2CO3 in water was recovered through vacuum filtration after 1 hour at a 1:30 weight ratio of the powder and distilled water. Finally, Li2CO3 containing Li of more than 98 wt.% was recovered.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 481-485
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model predictive direct power control of energy storage quasi-Z-source grid-connected inverter
    Autorzy:
    Tang, Min'an
    Yang, Shangmei
    Zhang, Kaiyue
    Wang, Qianqian
    Liu, Chenggang
    Dong, Xuewang
    Powiązania:
    https://bibliotekanauki.pl/articles/2042769.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quasi Z-Source
    inverter
    energy storage
    power control
    model predictive
    space vector
    Opis:
    In order to overcome the shortcoming of large switching losses caused by variable switching frequency appears in the conventional finite control set model predictive control (FCS-MPC) algorithm, a model predictive direct power control (MP-DPC) for an energy storage quasi-Z-source inverter (ES-qZSI) is proposed. Firstly, the power prediction model of the ES-qZSI is established based on the instantaneous power theory. Then the average voltage vector in the coordinate system is optimized by the power cost function. Finally, the average voltage vector is used as the modulation signal, and the corresponding switching signal with fixed frequency is generated by the shoot-through segment space vector pulse width modulation (SVPWM) technology. The simulation results show that the ES-qZSI realizes six shoot-through actions per control cycle and achieves the constant frequency control of the system, which verifies the correctness of the proposed control strategy.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 1; 21-35
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retention, recovery and recycling of metal values from high alloyed Steel slags
    Retencja, odzysk i recycling metalu z żużli wysokostopowych stali
    Autorzy:
    Teng, L. D.
    Seetharaman, S.
    Nzotta, M.
    Dong, P. D.
    Ge, H. L.
    Wang, L. J.
    Wang, H. J.
    Chychko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353318.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    retencja
    odzysk
    recykling
    żużel
    stal chromowa
    odwęglanie
    retention
    recovery
    recycling
    slag
    chromium steel
    decarburization
    Opis:
    The work was carried out in four parallel directions. The thermodynamic activities of oxides of Cr in steel slags were determined by slag-gas equilibration technique. The ratio of Cr2+/Cr3+ in CaO-MgO(-FeO)-AlO3-SiO2-CrO× system slags was measured by X-ray absorption near edge spectra (XANES). High-temperature mass spectrometry method was also used to obtain the distribution of chromium oxides. A mathematical correlation was established for estimating the ratio of Cr2+/Cr3+ as a function of temperature, partial pressure of oxygen and slag basicity. Laboratory investigations of the decarburization of high alloy steels under controlled oxygen potentials have been carried out to retain Cr in the steel phase. A mathematical model has been developed for the decarburization process with controlled oxygen partial pressure. Experimental and theoretical investigations have been carried out in optimizing the Mo-additions to steel in the EAF practice in Uddeholm Tooling AB. Substantial saving of Mo as well as less emissions of Mo-bearing dust are indicated in the study. A salt extraction process was developed to extract the metal values from steel slags. Successful extractions, followed by electrolysis indicate that this could be a viable route towards recovery of metals from metallurgical slags.
    Praca była realizowana w czterech równoległych kierunkach. Termodynamiczne aktywności tlenków Cr w żużlu zostały określone w stanie równowagi żużel-gaz. Stosunek Cr2+/Cr3+ w żużlach CaO-MgO-(-FeO)-AlO3-SiO2-CrOx mierzono metodą absorpcji promieniowania rentgenowskiego w pobliżu krawędzi widm (XANES). W celu uzyskania rozdziału tlenków chromu wykorzystano wysokotemperaturową spektrometrię masową. Korelację matematyczną ustalono do oceny stosunku Cr2+/Cr3+, jako funkcji temperatury, ciśnienia parcjalnego tlenu i zasadowości żużla. Badania laboratoryjne odwęglania stali wysokostopowych, kontrolowanego przez potencjał tlenowy przeprowadzono, aby pozostawić Cr w stali. Model matematyczny został opracowany dla procesu odwęglania z kontrolą parcjalnego ciśnienia tlenu. Eksperymentalne i teoretyczne badania zostały przeprowadzone przez optymalizację dodatku Mo do stali w procesie EAF w Uddeholm Tooling AB. Znaczne oszczędności Mo, a także mniejsza emisja pyłu zawierającego Mo są wskazane w badaniu. Proces ekstrakcji soli został stworzony, aby wyodrębnić metal z żużli stalowniczych. Udane ekstrakcje, a następnie elektrolizy, wskazują, że mogłaby to być opłacalna droga do odzysku metali z żużli metalurgicznych.
    Źródło:
    Archives of Metallurgy and Materials; 2010, 55, 4; 1097-1104
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an indirect ELISA based on glycoprotein B gene for detecting of Feline herpesvirus type 1
    Autorzy:
    Tan, Y.
    Dong, G.
    Niu, J.
    Guo, Y.
    Yi, S.
    Sun, M.
    Wang, K.
    Hu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087468.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    feline herpesvirus type 1
    gB protein
    indirect ELISA
    prokaryotic expression
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 631-633
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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