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    Wyświetlanie 1-33 z 33
    Tytuł:
    Fate in Thunderstorm by Cao Yu and Hippolytus by Euripides
    Autorzy:
    Zhang, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/915139.pdf
    Data publikacji:
    2016-06-15
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Thunderstorm
    Hippolytus
    fate
    tragedy
    Opis:
    Theatre, as opposed to traditional Chinese drama, was introduced to China through the first Opium War, and the establishment of Chunliushe in Japan is regarded as the birth of the real Chinese play in 1907. Hereafter, many plays were written and performed in China and were accepted as new form plays. Thunderstorm (Leiyu), Cao Yu’s first play, was published in 1934, and became the first masterpiece of modern Chinese theatre, symbolizing its becoming mature. As the playwright admitted, it was influenced by classical Greek Plays, as well as by Henrik Ibsen. This paper reflects upon the theme of fate in Thunderstorm by Cao Yu and Hippolytus by Euripides. Although Cao Yu interpreted that he was influenced by western plays consciously or unconsciously, Thunderstorm has its own Chinese roots. Similarities and differences in the themes of fate are compared by time or history; ethnic or family aspects; and the individual or feminine. The indescribable fate of the protagonists leads to the agony they suffer inside and also effects them outside because of typical social beliefs and family life; meanwhile, it helped to bring fame to the two tragedies.
    Źródło:
    Studia Azjatystyczne; 2016, 2; 137-151
    2449-5433
    Pojawia się w:
    Studia Azjatystyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cultivating Moral Competence of Chinese Undergraduates with KMDD-Sessions
    Autorzy:
    Zhang, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/781239.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Konstanz Method of Dilemma Discussion
    Moral Judgment Test
    moral and democratic education
    Opis:
    This study describes the results of interventions with the Konstanz Method of Dilemma Discussion (KMDD) by Georg Lind, with 89 economics undergraduate participants sampled from Guangdong province. The participants’ mean C-score in the Moral Judgment Test increased only a little because of the teacher’s little experience in using KMDD, but otherwise the intervention produced good results: the participants showed great interest in KMDD although this teaching method is very different from the typical Chinese teaching, and they enjoyed the KMDD-sessions and the classroom atmosphere created through it. Students’ feedback will be useful for future application and research on KMDD in China.
    Źródło:
    Ethics in Progress; 2013, 4, 1; 48-56
    2084-9257
    Pojawia się w:
    Ethics in Progress
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors of Chinese Adolescents’ Moral Judgment Competence – Findings from Hubei Province
    Autorzy:
    Zhang, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/781416.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Moral Judgment Test
    C-scores
    Chinese adolescents
    Opis:
    This paper uses MJT designed by German moral psychologist Lind as a measurement tool, selects 1933 teenagers from Wuhan, Xiangfan or Hubei province. The result shows that participants’ C-sore of different age is 16.90. Character of politic lies remarkable difference, and gender, profession, education, etc., doesn’t. But the specific characters of them have something to be concerned. On this basis, the author gives some advices and countermeasures for education departments.
    Źródło:
    Ethics in Progress; 2012, 3, 1; 83-95
    2084-9257
    Pojawia się w:
    Ethics in Progress
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission stability of chirped dark vector quasi-solitons in birefringent fiber system with nonlinear gain
    Autorzy:
    Xiao, Yan
    Zhang, Jing
    He, Qi
    Powiązania:
    https://bibliotekanauki.pl/articles/1835764.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chirped dark vector quasi-soliton
    coupled Ginzburg-Landau equation
    birefringent fiber
    Opis:
    In this article, we consider the coupled Ginzburg–Landau equation with variable coefficients including the nonlinear gain and obtain the exact solutions of chirped dark vector quasi-solitons via the ansatz method. Next, the propagation of chirped dark vector quasi-solitons is discussed to verify whether they can be transmitted stably in the birefringent optical fiber system. The numerical simulation shows that this can be achieved. We deeply add the small perturbation to the transmission of dark vector quasi-solitons to make the results above more general. The results further prove the correctness of our solutions.
    Źródło:
    Optica Applicata; 2021, 51, 1; 51-58
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Determinant of q-Distance Matrix of a Graph
    Autorzy:
    Li, Hong-Hai
    Su, Li
    Zhang, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/30147229.pdf
    Data publikacji:
    2014-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    q-distance matrix
    determinant
    weighted graph
    directed graph
    Opis:
    In this note, we show how the determinant of the q-distance matrix Dq(T) of a weighted directed graph G can be expressed in terms of the corresponding determinants for the blocks of G, and thus generalize the results obtained by Graham et al. [R.L. Graham, A.J. Hoffman and H. Hosoya, On the distance matrix of a directed graph, J. Graph Theory 1 (1977) 85-88]. Further, by means of the result, we determine the determinant of the q-distance matrix of the graph obtained from a connected weighted graph G by adding the weighted branches to G, and so generalize in part the results obtained by Bapat et al. [R.B. Bapat, S. Kirkland and M. Neumann, On distance matrices and Laplacians, Linear Algebra Appl. 401 (2005) 193- 209]. In particular, as a consequence, determinantal formulae of q-distance matrices for unicyclic graphs and one class of bicyclic graphs are presented.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2014, 34, 1; 103-111
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Minimum Spectral Radius of Signless Laplacian of Graphs with a Given Clique Number
    Autorzy:
    Su, Li
    Li, Hong-Hai
    Zhang, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/30148000.pdf
    Data publikacji:
    2014-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    clique number
    kite graph
    signless Laplacian
    spectral radius
    Opis:
    In this paper we observe that the minimal signless Laplacian spectral radius is obtained uniquely at the kite graph $PK_{n-\omega,\omega}$ among all connected graphs with $n$ vertices and clique number $\omega$. In addition, we show that the spectral radius $\mu$ of $PK_{m,\omega}$ $(m\geq1)$ satisfies $$\frac{1}{2}(2\omega-1+\sqrt{4\omega^{2}-12\omega+17})\leq\mu\leq 2\omega-1.$$ More precisely, for $m>1$, $\mu$ satisfies the equation \[ \mu-\omega-\frac{\omega-1}{\mu-2\omega+3}=a_m\sqrt{\mu^2-4\mu}+\frac{1}{t_1}, \] where $a_m=\frac{1}{1-t_1^{2m+3}}$ and $t_{1}=\frac{\mu-2+\sqrt{(\mu-2)^{2}-4}}{2}$. At last the spectral radius $\mu(PK_{\infty,\omega})$ of the infinite graph $PK_{\infty,\omega}$ is also discussed.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2014, 34, 1; 95-102
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the peak flow reduction of small reservoirs. A case study of the Brown Bridge Pond, Michigan, USA
    Autorzy:
    Zhang, Jing
    Guo, Chen-lin
    Xie, Guang-Ming
    Xing, Bing
    Powiązania:
    https://bibliotekanauki.pl/articles/27323980.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Opis:
    Due to the high frequency and great damage of flood disasters, it is important to reduce the flood peak when it goes through the reservoir. A hydraulic model which integrates the implicit equation of water balance, water head-discharge carves, and water head-storage carves together, is proposed to simulate the flood peak reduction of a small reservoir. The proposed method was employed to simulate the flood peak reduction in the Brown Bridge Reservoir, Michigan, US. The results show that the proposed method can simulate the flood peak reduction in a small reservoir, and the Brown Bridge Dam can reduce the flood peak when hundred-year floods go through. When all gates or spillways are fully opened, the initial water head of the reservoir significantly influences the capacity of flood peak reduction. When the initial water head of the Brown Bridge Reservoir is 240.18 and 241.40 m, the hundred-year flood peak would be reduced to 23.11 m3/s and 25.85 m3/s, respectively. By optimizing the gates or spillways, the hundred-year flood peak could be reduced. When the initial water head of the reservoir is 241.40 and 240.18 m, the hundred-year flood peak would be reduced to 17.98 and 16.54 m3/s, respectively
    Źródło:
    Environment Protection Engineering; 2023, 49, 3; 83--94
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influences of source intensity and meteorological factors on sulfur dioxide and nitrogen oxides based on the path analysis mode
    Autorzy:
    Guo, Chen-Lin
    Zhang, Jing
    Zhou, Qian Shuang
    Ma, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/2171846.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    meteorological factor
    analysis model
    sulfur dioxide
    nitrogen dioxide
    czynnik meteorologiczny
    model analityczny
    dwutlenek siarki
    tlenek azotu
    Opis:
    With rapid economic development and industrialization, air pollution is becoming a critical global issue affecting health. Sulfur dioxide and nitrogen oxides are the major contributors to acid rain and the key indicators for evaluating atmospheric pollution. And source intensity and meteorological factors are the main ways to influence the concentrations of sulfur dioxide and nitrogen oxides. Thus, to investigate the specific effects of source intensity, temperature, humidity, wind speed and atmospheric pressure on SO2 and NOx, the path analysis method was used for the model. The results showed that Source intensity significantly affects the concentrations of SO2and NO2. For both NO2 and SO2, the source intensity accounted for around 40%. Meteorological factors have very limited effects on the concentrations of SO2and NO2. The effects of the meteorological factors on air pollutants are specific as differences in material properties. Humidity significantly affects the concentration of SO2while temperature, humidity and wind speed have significantly affected the concentration of NO2.
    Źródło:
    Environment Protection Engineering; 2022, 48, 4; 51--65
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on communication emitter identification based on semi-supervised dimensionality reduction in complex electromagnetic environment
    Autorzy:
    Ge, Wei
    Qi, Lin
    Tong, Lin
    Zhu, Jun
    Zhang, Jing
    Zhao, Dongyang
    Li, Ke
    Powiązania:
    https://bibliotekanauki.pl/articles/27311449.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    communication emitter identification
    feature extraction
    dimensionality reduction
    VMD
    ESDA
    variational mode decomposition
    exponential semi-supervised discriminant analysis
    identyfikacja emitera komunikacyjnego
    ekstrakcja cech
    redukcja wymiarowości
    rozkład w trybie wariacyjnym
    analiza dyskryminacyjna wykładnicza półnadzorowana
    Opis:
    The individual identification of communication emitters is a process of identifying different emitters based on the radio frequency fingerprint features extracted from the received signals. Due to the inherent non-linearity of the emitter power amplifier, the fingerprints provide distinguishing features for emitter identification. In this study, approximate entropy is introduced into variational mode decomposition, whose features performed in each mode which is decomposed from the reconstructed signal are extracted while the local minimum removal method is used to filter out the noise mode to improve SNR. We proposed a semi-supervised dimensionality reduction method named exponential semi-supervised discriminant analysis in order to reduce the high-dimensional feature vectors of the signals, and LightGBM is applied to build a classifier for communication emitter identification. The experimental results show that the method performs better than the state-of-the-art individual communication emitter identification technology for the steady signal data set of radio stations with the same plant, batch and model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145766
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the migration path of the maximum pollutants’ concentration. Case study of the tailing pond, southwest China
    Autorzy:
    Zhang, Jing
    Ma, Yong
    Xing, Bing
    Zhang, Jian-Min
    Ren, Yu-Feng
    Liang, Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/2086910.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    groundwaters
    tailing pond
    zinc mine
    lead mine
    ground contaminants
    wody gruntowe
    staw osadowy
    kopalnia cynku
    kopalnia ołowiu
    zanieczyszczenie gruntu
    Opis:
    Following China's economic development, lots of tailing deposits have become potential pollution sources, and their leaching would release the trace elements into the natural environment. The leakage rate model and the solute transport models of groundwater are coupled to investigate the effects of the tailing ponds on groundwater. It indicates that the anti-seepage layer is a necessary and important component of the tailing ponds, which could protect the soil or groundwater to be polluted by wastewater. Under three scenarios (scenario A - ideal conditions, scenario B - the worst conditions, and scenario C), the proportions of maximum concentration to source concentration are 1.2, 94.6, and 19.1%, respectively. Under the worst states of anti-seepage layers, the pollution areas after 730, 1800, 3807 and 7300 days were 130 500, 313 200, 523 800, and 729 000 m2, respectively. Compared with Scenario B, the pollution areas of Scenario C after 1800, 3807, and 7300 days were cut by 52.97, 74.55, and 81.73, respectively. Given important anti-seepage layers, the tracking monitor system is necessary and important to discover whether the groundwater was contaminated in time.
    Źródło:
    Environment Protection Engineering; 2022, 48, 2; 59--72
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of monovalent and divalent ions in coal gasification brine on the froth entrainment and flotation kinetics of anthracite coal
    Autorzy:
    Zheng, Kaidi
    Bu, Xiangning
    Zhou, Shaoqi
    Zhang, Jing
    Shao, Huaizhi
    Sha, Jie
    Xie, Guangyuan
    Powiązania:
    https://bibliotekanauki.pl/articles/1845216.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coal gasification brine
    salts ions
    coal flotation
    entrainment
    flotation kinetics
    DLVO theory
    Opis:
    Water plays a critical role in various stages of flotation, which brings a lot of pressure to the flotation processing plants resided in dry areas. In this regard, it will be of significance to explore the feasibility of using wastewater resources in mineral flotation. Coal gasification brine (CGB) that contains a high concentration of salts becomes the subject of interest of this study. In this study, a synthetic CGB solution, which was prepared by adding NaCl, MgCl2, and CaCl2 to ultrapure water based on the composition of salts in a real CGB, was used in the flotation of anthracite coal. The comparison results based on the first-order model showed that flotation in the presence of the synthetic CGB solution gave a higher flotation selectivity (SI =7.086) than that of flotation in ultrapure water (SI=3.545). Water recoveries and average bubble sizes in the froth showed that the addition of the three salt ions (Na+, Mg2+, and Ca2+) was conducive to diminishing the entrainment of gangue materials as a result of the reduction of water reporting to the froth. Additionally, the zeta potentials and induction time measurements indicated that only divalent ions of Ca2+ and Mg2+ significantly compressed the double electrical layer and enhanced the attachment between bubbles and coal particles according to DLVO theory, which was further confirmed by the calculation of interaction energy between coal and bubbles. The findings of the present work may promote the use of CGB as a potential water resource in coal flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 960-974
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of leaching efficiency of cathode material of spent $LiNi_xCo_yMn_zO_2$ lithium-ion battery by the in-situ thermal reduction
    Autorzy:
    Lu, Qichang
    Jiang, Haidi
    Xie, Weining
    Zhang, Guangwen
    He, Yaqun
    Duan, Chenlong
    Zhang, Jing
    Yu, Zhaoyi
    Powiązania:
    https://bibliotekanauki.pl/articles/1447956.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spent lithium-ion batteries
    in-situ thermal reduction
    leaching efficiency
    LiNixCoyMnzO
    Opis:
    Green cars and electronic products consume lots of lithium-ion batteries (LIBs), and massive spent LIBs are yielded due to performance degradation. This paper provides an economical and environmentally friendly approach to recover valuable metals from cathode materials of the spent LIBs. It combines the in-situ thermal reduction (self-reduction by polyvinylidene fluoride (PVDF) and residual electrolyte in cathode material) and sulfuric acid leaching. Elements of high valent are reduced by the binder (PVDF) and the residual electrolyte on the surface of $NCM(LiNi_xCo_yMn_{1-x-y}O_2)$ material at high temperatures. Moreover, the changes in substance type, element valency, and contents of cathode materials reduced with various terminal temperatures and retention time are analyzed by Xray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Results show that the optimal terminal temperature for in-situ thermal reduction is 600 °C, and the optimum retention time is 120 min. Under the best in-situ thermal reduction conditions, the results from XRD confirm that part of $Ni^{2+}$ is converted to simple substance $Ni$, $Co^{3+}$ is reduced to $Co$, and $Mn^{4+}$ is reduced to $Mn^{2+}$ and elemental $Mn$, which are confirmed by XRD. Analyzed results by XPS indicate that the content of $Ni^{2+}$ decreases to 67.05%, and $Co^{3+}$ is completely reduced to $Co$. $Mn^{4+}$ is reduced to 91.41% of $Mn^{2+}$ and 8.59% of simple substance $Mn$. In-situ thermal reduction benefits the leaching processes of cathode materials. The leaching efficiencies of $Ni$, $Co$, and $Mn$ increase from 53.39%, 51.95%, and 0.71% to 99.04%, 96.98%, and 97.52%, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 70-82
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vps41, a protein involved in lysosomal trafficking, interacts with caspase-8
    Autorzy:
    Wang, Lu
    Pan, Xiao
    He, Liangqiang
    Zhang, Rong
    Chen, Wei
    Zhang, Jing
    Lu, Min
    Hua, Zi-Chun
    Powiązania:
    https://bibliotekanauki.pl/articles/1039602.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    caspase-8
    yeast two-hybrid
    Vps41
    protein interaction
    apoptosis
    Opis:
    Caspase-8 is a member of the cysteine-aspartic acid protease (caspase) family which plays a central role in apoptosis and development. We screened caspase-8 interacting proteins from mouse T-cell lymphoma and 7.5-day embryo cDNA libraries by yeast two-hybrid system and obtained eleven positive clones, including Vacuolar protein sorting 41 (Vps41), a protein involved in trafficking of proteins from the late Golgi to the vacuole. The interaction of Vps41 with caspase-8 was confirmed by co-immunoprecipitation (co-IP) and co-localization studies in HEK293T cells. Co-IP experiments also showed that Vps41 binds to the p18 subunit of caspase-8 through its WD40 region and RING-finger motif. Furthermore, we found that overexpression of Vps41 promotes Fas-induced apoptosis in A549 human lung adenocarcinoma cells. The cleavage of caspase-3, a caspase-8 downstream effector, was increased when cells were transfected with Vps41-overexpressing plasmid. Together, these results suggest a novel interaction of caspase-8 with Vps41 and provide a potential role of Vps41 beyond lysosomal trafficking.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 1; 37-42
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Moral Education Affinity from the Perspective of Psychology
    Autorzy:
    Jing, Zhang
    Suting, Li
    Powiązania:
    https://bibliotekanauki.pl/articles/943813.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    moral education affinity
    mental process
    psychological mechanism
    generation of affinity
    cultivation of affinity
    Opis:
    Moral education affinity has a very important influence on the smoothdevelopment of moral education activities and the improvement of educationaleffectiveness. From the perspective of psychology, the needs and emotions ofthe educatees are its motivational mechanism, the will of the educatees is itsmaintenance mechanism, psychological compatibility is its guarantee mechanism,and the learning psychology of the educatees is the reinforcement mechanism.The generation of moral education affinity is the process of educators’ activeinterpersonal attraction, the application of positive psychological effect, the changeof educatees’ attitude, and the psychological exchange and interaction betweeneducators and educatees. The main way to cultivate moral education affinity isto fully pay attention to the needs or changes of the educatees, make efforts tostimulate and strengthen the learning motivation, maintain the main status androle of the educatees, and enhance the appeal and affinity of the educationalprocess through the unity of knowledge and action.
    Źródło:
    Ethics in Progress; 2020, 11, 1; 120-132
    2084-9257
    Pojawia się w:
    Ethics in Progress
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza motywacji, problemów i potrzeb chińskich młodszych nauczycieli języka polskiego jako obcego
    Analysis of motivation, problems, and needs of Chinese junior teachers of Polish as a foreign language
    Autorzy:
    Wang, Jing
    Zhang, Huiling
    Cao, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/31339962.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
    Opis:
    With the dynamic development of Chinese Polish Studies since 2018, there has been a growing demand for teachers of Polish as a foreign language who are native Chinese speakers in the labour market of the People’s Republic of China. Nowadays, almost every Polish language centre at a university has its own teaching staff. Many of them are not only quite modest in terms of staff numbers, but also very young in terms of the age and experience of the teachers. Today, both Polish and Chinese language literature still lacks in-depth research on this specific group of glottodidactics. Therefore, the present study aims at getting to know Chinese junior teachers of Polish as a foreign language working at universities, and to gain knowledge about their motivation for their profession, problems and needs at work. From the questionnaire survey of 23 purposively selected respondents, it can be concluded that the greatest motivation of the respondents was related to students and interests in research and/or teaching. The problems they encountered at work were related to insufficient skills, lack of materials and those caused by the work environment. They are most in need of improved teaching methods and techniques, more and better teaching materials and help from masters in this field.
    Źródło:
    Gdańskie Studia Azji Wschodniej; 2022, 21; 129-145
    2353-8724
    Pojawia się w:
    Gdańskie Studia Azji Wschodniej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of initial damage on time-dependent behavior of sandstone in uniaxial compressive creep test
    Wpływ uszkodzeń początkowych na przebieg czasowy zmian zachowania piaskowca w trakcie próby jednoosiowego pełzania
    Autorzy:
    Hou, Rongbin
    Zhang, Kai
    Tao, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/219522.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    próba pełzania jednoosiowego przy wielokrotnym obciążeniu
    uszkodzenia początkowe
    czasowy przebieg zachowań górotworu
    piaskowiec
    multi-loading uniaxial creep test
    initial damage
    time-dependent behaviour
    sandstone
    Opis:
    Time-dependent behavior of rock mass is important for long-term stability analysis in rock engineering. Extensive studies have been carried out on the creep properties and rheological models for variable kinds of rocks, however, the effects of initial damage state on the time-dependent behavior of rock has not yet been taken into consideration. In the present study, the authors proposed a creep test scheme with controlled initial damage to investigate the influence of initial damage on the time-dependent behavior of sandstone. In the test scheme, the initial states of damage were first determined via unloading the specimen from various stresses. Then, the creep test was conducted under different stress levels with specific initial damage. The experimental results show that there is a stress threshold for the initial damage to influence the behavior of the rock in the uniaxial compressive creep tests, which is the stress threshold of dilatancy of rock. When the creep stress is less than the stress threshold, the effect of the initial damage seems to be insignificant. However, if the creep stress is higher than the stress threshold, the initial damage has an important influence on the time-dependent deformation, especially the lateral and volumetric deformation. Moreover, the initial damage also has great influence on the creep failure stress and long-term strength, i.e., higher initial damage leading to lower creep failure stress and long-term strength. The experimental results can provide valuable data for the construction of a creep damage model and long-term stability analysis for rock engineering.
    Przebieg czasowy zachowania górotworu jest zagadnieniem kluczowym w analizie stabilności systemu w ujęciu długoterminowym. Przeprowadzono szerokie badania modeli reologicznych i właściwości procesów pełzania dla rozmaitych typów skał; jednakże w badaniach nie uwzględniano wpływu uszkodzeń początkowych na zachowanie górotworu i jego przebieg czasowy. W artykule autorzy zaproponowali nowy sposób przeprowadzania próby pełzania, z uwzględnieniem kontrolowanych uszkodzeń początkowych, tak by wpływ obecności uszkodzeń początkowych na przebieg czasowy zmian zachowania piaskowca mógł zostać uwzględniony. W metodzie tej w pierwszej fazie określono zakres początkowych uszkodzeń poprzez odprężenie próbki w celu wyeliminowania rożnego rodzaju naprężeń. Następnie przeprowadzono próbę pełzania w warunkach zmiennych obciążeń przykładanych do próbki o określonym poziomie uszkodzeń początkowych. Wyniki eksperymentu wskazują na istnienie pewnej wartości progowej naprężenia powyżej której obecność uszkodzeń początkowych będzie mieć wpływ na zachowanie próbki skalnej w trakcie próby jednoosiowego pełzania; jest to poziom progowy dla powstawania dylatacji. Gdy naprężenie pełzania ma wartość niższą od wartości progowej, wpływ uszkodzeń początkowych wydaje się nieznaczny. Jednakże, dla naprężeń pełzania powyżej wartości progowej, wpływ uszkodzeń początkowych na przebieg odkształceń jest znaczący, zwłaszcza w odniesieniu do odkształceń poprzecznych i objętościowych. Ponadto, istnie-nie uszkodzeń początkowych ma także wpływ na poziom naprężeń rozrywających przy próbie pełzania i wytrzymałość próbki w ujęciu długoterminowym. Wykazano, że im większe uszkodzenia początkowe, tym niższa wartość naprężenia zrywającego przy próbie pełzania i niższa wytrzymałość długoterminowa. Wyniki eksperymentu dostarczyć mogą cennych danych niezbędnych do skonstruowania modelu uszkodzeń skał wskutek pełzania oraz do analiz stabilności konstrukcji inżynierskich w ujęciu długoterminowym.
    Źródło:
    Archives of Mining Sciences; 2019, 64, 4; 687-707
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Event-triggered cooperative control for high-order nonlinear multi-agent systems with finite-time consensus
    Autorzy:
    Gong, Shiyin
    Zheng, Meirong
    Hu, Jing
    Zhang, Anguo
    Powiązania:
    https://bibliotekanauki.pl/articles/24200691.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    multiagent system
    cooperative control
    event triggered control
    neuroadaptive control
    prescribed performance
    system wieloagentowy
    sterowanie wyzwalane zdarzeniami
    sterowanie neuroadaptacyjne
    Opis:
    An event-triggered adaptive control algorithm is proposed for cooperative tracking control of high-order nonlinear multiagent systems (MASs) with prescribed performance and full-state constraints. The algorithm combines dynamic surface technology and the backstepping recursive design method, with radial basis function neural networks (RBFNNs) used to approximate the unknown nonlinearity. The barrier Lyapunov function and finite-time stability theory are employed to prove that all agent states are semi-globally uniform and ultimately bounded, with the tracking error converging to a bounded neighborhood of zero in a finite time. Numerical simulations are provided to demonstrate the effectiveness of the proposed control scheme.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2023, 33, 3; 439--448
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Crossing Number of Join of the Generalized Petersen Graph P (3, 1) with Path and Cycle
    Autorzy:
    Ouyang, Zhang Dong
    Wang, Jing
    Huang, Yuan Qiu
    Powiązania:
    https://bibliotekanauki.pl/articles/31342419.pdf
    Data publikacji:
    2018-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    crossing number
    drawing
    join product
    generalized Petersen graph
    Opis:
    There are only few results concerning the crossing numbers of join of some graphs. In this paper, the crossing numbers of join products for the generalized Petersen graph P(3, 1) with n isolated vertices as well as with the path Pn on n vertices and with the cycle Cn are determined.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2018, 38, 2; 351-370
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital watermarking algorithm based on 4-level discrete wavelet transform and discrete fractional angular transform
    Autorzy:
    Li, Jing-You
    Zhao, Chun-Hui
    Zhang, Guang-Da
    Powiązania:
    https://bibliotekanauki.pl/articles/2033921.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    digital watermarking algorithm
    mix optical bistability
    Harris feature point detection
    discrete wavelet transform
    discrete fractional angular transform
    singular value decomposition
    Opis:
    Nowadays, there are many watermarking algorithms based on wavelet transform. The simple one is to insert directly the watermark into the wavelet transform coefficients. However, most of the existing watermarking schemes can only resist traditional signal processing attacks, such as image compression, noise and filtering. When the watermarked image is subject to geometric transformations, especially rotation attack, it is hard to detect the watermark successfully. In this paper, a digital watermarking algorithm is proposed based on 4-level discrete wavelet transform and discrete fractional angular transform. To enhance the security of the algorithm, the watermark is scrambled with the simplicity of Arnold transform and chaos-based mix optical bistability model, since the chaos is pseudorandom and sensitive to the initial values. And the watermark is embedded into the medium frequency sub-band of the 1-level wavelet decomposition according to the Harris feature point detection. Simulation results show that the proposed digital watermarking algorithm by combining 4-level discrete wavelet transform with discrete fractional angular transform could resist rotation attack and other common attacks.
    Źródło:
    Optica Applicata; 2021, 51, 4; 605-619
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Power Transmission and Its Application in Laser-Powered Electrical Motor Drive: A Review
    Autorzy:
    Liu, Hongzuo
    Zhang, Yixuan
    Hu, Yihua
    Tse, Zion
    Wu, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/1955981.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laser power transmission
    photovoltaic material
    laser diode
    optical fibre power transmission
    atmosphere transmission
    Opis:
    Laser power transmission (LPT) is considered a potentially efficient way for power delivery, especially in long-distance wireless applications and harsh hazardous environmental conditions. In contrast to other wireless power transmission (WPT) methods, LPT has many advantages such as lower device size, focused transmitting direction and high power density. With the development of technology, LPT has been widely adopted in several fields. In conservative industries, the utilisation of LPT can resolve the limitation problem in a wired connection. The adverse influence of electromagnetic interference (EMI) concerning application and high-temperature fields can be reduced. This paper will give a simple review of LPT and demonstrate the basic concept of a photoelectric emitter, transmission channel and receiver material. Based on the recent research about diode laser beam combining technology and high-efficiency multi-junction photovoltaics (PV) materials, the advised LPT devices for simple application as laser power motor will be simply discussed.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 167-184
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic emission characteristics of deep granite under triaxial cylic loading and unloading
    Autorzy:
    Pei, Feng
    Zhang, Yue-Zheng
    Zhao, Ji-Wei
    Geng, Jing-Ming
    Powiązania:
    https://bibliotekanauki.pl/articles/1402362.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    deep granite
    acoustic emission
    frequency spectrum
    precursory feature recognition
    Opis:
    In order to obtain the damage and AE characteristics of deep granite, TAW-2000 electrohydraulic servo rigid testing equipment and PCI-2 acoustic emission acquisition system were used to clarify the relationship between AE characteristics and stress level under conventional triaxial and cyclic loading and unloading. The results show that: AE characteristic parameters such as counts and energy under different confining pressures have good consistency in reflecting cracks growth process, which correspond to the stress level of rock sample; Before the critical failure, the AE amplitude increases significantly and extremely high peak frequency and extremely low peak frequency began to appear; The phenomenon that peak frequency band number increases significantly can be used as the precursor of rock failure; The change trend of characteristic parameters, amplitude and peak frequency band were related to the stress level of rock, and the loading path has little influence on it, which verified the effectiveness of AE precursory feature recognition; FR value decreases continuously with the increase of cyclic stress level and overall trend is downward, which indicated that AE memory gradually decreases as the stress level increases; From the perspective of damage mechanics, the AE characteristics of rock before failure are explained reasonably by the development of damage rate.
    Źródło:
    Mining Science; 2020, 27; 209-225
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Dendrite Morphology and Micro-Segregation in U-Nb Alloy During Solidification
    Autorzy:
    Su, Bin
    Liu, Jing-Yuan
    Zhang, Xiao-Peng
    Yan, Xue-Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/2174585.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-Nb alloys
    solidification process
    dendrite growth
    cellular automaton
    numerical simulation
    Opis:
    Due to the importance of uranium and uranium alloys to national defence and nuclear industrial applications, it is necessary to understand dendrite formation in their solidification structures and to control their microstructures. In this study, a modified cellular automaton model was developed to predict 2-D and 3-D equiaxed dendrite growth in U-Nb alloys. The model takes into account solute diffusion, preferential growth orientation, interface curvature, etc., and the solid fraction increment is calculated using the local level rule method. Using this model, 2-D large-scale and 3-D equiaxed dendrite growth with various crystallographic orientations in the U-5.5Nb alloy were simulated, and the Nb micro-segregation behaviour during solidification was analysed. The simulated results showed reasonable agreement with the as-cast microstructure observed experimentally.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1333--1339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on fluoride fixation effect of Bayan Obo rare earth iron ore and three sodium agents under microwave irradiation
    Autorzy:
    Guo, Jing
    Wen, Ming
    Li, Jie
    Hong, Xunhai
    Zhang, Wenhao
    Wang, Yonglun
    Powiązania:
    https://bibliotekanauki.pl/articles/2146846.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Bayan Obo rare earth iron ore
    microwave roasting
    sodium agent fluoride fixation
    Opis:
    To investigate the fluorine fixation of Bayan Obo rare-earth iron ores in beneficiation and metallurgy processes, the effect of three sodium agents, namely, sodium hydroxide, sodium carbonate, and sodium bicarbonate, on fluorine fixation under the action of microwaves was investigated using Xray diffraction, chemical detection, and orthogonal experiments. The effects of different types of sodium, roasting temperatures, sodium ratios, and roasting times on the fluorine fixation rate were evaluated. Results show that compared with conventional roasting, the fluorine fixation efficiency of Bayan Obo rare-earth iron ore under the action of microwave is superior after the formulation of the sodium agent, which is crucial for the study. Among the three sodium agents, the fluorine fixation effect of NaHCO3 can be used as the preferred sodium agent. Orthogonal experiments showed that the factors influencing the magnitude of the fluorine fixation rate are the roasting temperature, sodium agent ratio, and roasting constant temperature time in the order of priority. The optimal conditions for the fluorine fixation process are the microwave roasting temperature of 973.15 K, sodium bicarbonate ratio of 40%, and roasting time of 60 min. The highest fluorine fixation rate of 86.72% can be obtained. The findings of this study can provide a reference for the development of green and economic recovery processes for Bayan Obo rare-earth iron ores.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 63--76
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carrollite Leaching in H2SO4-NaClO3 Media at Atmospheric Pressure
    Autorzy:
    Dong, Bo
    Wu, Jian-Hui
    Wu, Jun
    Zhang, Xian-Peng
    Zhai, Jing-Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/352763.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CuCo2S4
    atmospheric leaching
    H2SO4-NaClO3 media
    Opis:
    A new extraction process suitable for treating refractory CuCo2S4 under atmospheric pressure acidic leaching conditions was investigated. The effect of variables such as oxidant species, liquid-to-solid ratio, leaching time, oxidizing agent and mineral quality ratio, H2SO4 concentration, temperature and sodium chloride concentration on the extraction efficiency of Co, Cu and Fe from CuCo2S4 were investigated. Under optimal conditions including P80-P90 of the sample was d < 0.0074 mm, stirring speed of 400 rpm, leaching time of 8 h with sodium chlorate (NaClO3) and mineral quality ratio of 0.5, 2 mol/L H2SO4, liquid-to-solid ratio of 7, leaching temperature of 90°C and 4 mol/L sodium chloride. The leaching efficiency of Co, Cu, and Fe were nearly 97.08%, 100%, and 92.45%, respectively. Furthermore, the contents of cobalt and copper in leaching residue were all less than 0.4 wt.%, which satisfies the requirements of industrial production.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 313-319
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on mine seal stability under explosion load and ground pressure in underground coal mines
    Autorzy:
    Cheng, Jianwei
    Song, Wanting
    Jing, Yi
    Zhang, Xixi
    Korzec, Marek
    Borowski, Marek
    Wang, Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/218944.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kopalnia węgla
    symulacja numeryczna
    dłutowanie
    seals in underground coal mines
    numerical simulation
    slotting
    ground pressure
    roof to floor moving convergence
    damage level
    Opis:
    The mine seals in coal mines with a good impact resistance and air tightness are mainly used to isolate abandoned mining areas from active workings. For one thing, it can prevent the leakage of harmful gases, such as toxic gas from abandoned areas. For another, once an underground mine explosion happens, it can effectively block the spread of the explosion between the abandoned mining areas and the active workings. Hence, it is of great significance to study the explosion-proof performance and mechanical properties of the mine seals. First of all, the effect of slotting on the stability of the seals in coal mines under explosion load was explored in this study. By numerical simulations, the mechanical response characteristics of the seals with or without cutting a slot under the explosion load were compared in detail. The results show that slotting improved the stress concentration at the contact surface of surrounding rock by transferring partial impact received by mine seals to the surrounding rocks, thus, to achieve the effect of buffering explosion impact. Besides, such effect will be enhanced with increasing cutting depth into rock, and will stabilize when the depth is 20 cm. On this basis, the mechanical properties and damage of the seals constructed by different materials (standard brick and #C40 concrete) under the explosion load were compared. It was found that once a slot was set, the maximum deformation of the concrete seal was reduced, while the maximum deformation of the brick seal increased. Since the non-deformability of the concrete seal is obviously stronger than that of the brick seal, with the impact resistance stronger than that of the brick seal, the concrete seal is more suitable for slotting. Moreover, the damage of the seals in underground coal mines under the strata ground pressure was studied; the results of which show that the damage state under the ground pressure can be divided into 3 levels, i.e. no damage, minor damage and rapid development of damage. Meanwhile, it was found that the prestressed structure fordem by the ground pressure at the level of no damage can enhance the protective effect of the seals in coal mines. However, when the ground pressure was further developed, the seal itself was destroyed and the protective effect was lost. In addition, the influence of roof to floor moving convergence, a deformation parameter of the roadway, on the seals was also investigated. The results show that the ground pressure and roof-to-floor convergence act on the seals in coal mines in the same way, thus roof to floor moving convergence can replace the ground pressure to analyze other related mechanical properties of the seals in coal mines in the future researches.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 1; 71-87
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization dependent high refractive index metamaterial with metallic dielectric grating structure in infrared band
    Autorzy:
    Li, Jianmin
    Chen, Peng
    Fang, Bo
    Cai, Jinhui
    Zhang, Le
    Wu, Yinglai
    Jing, Xufeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2172825.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metamaterial
    high refractive index
    infrared band
    Opis:
    According to the theory of high refractive index of metamaterials, a composite structure of metal dielectric grating was designed to achieve high refractive index in infrared band. Based on the S-parameter inversion algorithm, we extracted the effective permittivity, the effective permeability, and the effective refractive index of the designed metamaterial. By changing the geometric parameters of the composite grating metamaterial structure, the effective refractive index of the designed metamaterial reaches more than 8.0 at the infrared resonance frequency. This is a high refractive index that many natural materials cannot achieve. It is noteworthy that the metamaterial structure has obvious polarization sensitivity. The metamaterial structure has both high refractive index and wideband zero refractive index properties when different polarized light is incident. At the same time, we further investigate the influence of metamaterial geometric parameters on the effective refractive index of metamaterials. Also, we propose a double grating metamaterial structure to obtain more degrees of freedom of metamaterial on the effective refractive index.
    Źródło:
    Optica Applicata; 2022, 52, 3; 441--460
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    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:
    A novel combinational evaluation method of voltage and reactive power in regional power grid containing renewable energy
    Autorzy:
    Ji, Yuqi
    Chen, Xuehan
    Xiao, Han
    Shi, Shaoyu
    Kang, Jing
    Wang, Jialin
    Zhang, Shaofeng
    Powiązania:
    https://bibliotekanauki.pl/articles/1955201.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adaptive weighting coefficient
    combinational evaluation
    renewable energy
    typical scenarios
    adaptacyjny współczynnik wagowy
    ocena kombinacyjna
    energia odnawialna
    typowy scenariusz
    Opis:
    The output of renewable energy is strongly uncertain and random, and the distribution of voltage and reactive power in regional power grids is changed with the access to large-scale renewable energy. In order to quantitatively evaluate the influence of renewable energy access on voltage and reactive power operation, a novel combinational evaluation method of voltage and reactive power in regional power grids containing renewable energy is proposed. Firstly, the actual operation data of renewable energy and load demand are clustered based on the K-means algorithm, and several typical scenarios are divided. Then, the entropy weight method (EWM) and the analytic hierarchy process (AHP) are combined to evaluate the voltage qualified rate, voltage fluctuation, power factor qualified rate and reactive power reserve in typical scenarios. Besides, the evaluation results are used as the training samples for back-propagation (BP) neural networks. The proposed combinational evaluation method can calculate the weight coefficient of the indexes adaptively with the change of samples, which simplifies the calculation process of the indexes’ weight. At last, the case simulation of an actual regional power grid is provided, and the historical data of one year is taken as the sample for training, evaluating and analyzing. And finally, the effectiveness of the proposed method is verified based on the comparison with the existing method. The evaluated results could provide reference and guidance to the operation analysis and planning of renewable energy.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 925-942
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    COMBINATION OF BERBERINE AND MATRINE AFFECTS APOPTOSIS AND CELLCYCLE IN HUMAN CERVICAL CANCER CELLS
    Autorzy:
    Zhang, Qijiayu
    Sun, Yi
    Huang, Yuxi
    Sun, Jing
    Zhao, Chongbo
    Song, Yijun
    Wu, Juanhua
    Powiązania:
    https://bibliotekanauki.pl/articles/895719.pdf
    Data publikacji:
    2019-12-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    apoptosis
    cervical cancer
    Matrine
    berberine
    Opis:
    Cervical cancer is the fourth leading cause of malignancy-related mortality in women worldwide, and effective advanced-stage therapies are urgently required. Berberine is a quaternary ammonium compound extracted from traditional Chinese medicinal herbs, including Phellodendron spp., with antibacterial and antitumor activities. Matrine, the main active ingredient of Sophora flavescens rhizomes, has not only traditionally described health effects but is also widely used for its anticancer, anti-inflammatory, immunoregulatory, antiviral, and hepatoprotective effects. We investigated the antitumor activities of berberine and matrine against human cervical cancer HeLa and SiHa cells using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, along with flow cytometry and western blotting analyses, to assess the effect of the compounds on the cellular status and apoptosis- and cell cycle-related proteins. The 24 h half-maximal inhibitory concentrations (IC50) of berberine and matrine were 123.633 ± 4.278 µmol/L and 9.625 ± 0.245 mmol/L against HeLa cells and 105.067 ± 3.745 µmol/L and 8.50 ± 0.23 mmol/L against SiHa cells, respectively. Berberine plus matrine inhibited cancer cell growth and caused cell cycle arrest. We observed an increased stimulation of apoptosis, which was likely mediated by enhanced levels of caspase-3, caspase-9, and B-cell lymphoma 2 (Bcl-2)-associated X protein (Bax), as well as decreased Bcl-2 protein expression. Cell cycle arrest in the G1 phase was probably mediated by p21 upregulation and cyclin-dependent kinase (Cdk)-4, Cdk-6, and cyclin D1 suppression. Combination treatment with berberine and matrine effectively inhibited human cervical cancer cell proliferation, most likely by stimulating apoptosis and inducing cell cycle arrest.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 6; 1089-1097
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring the Geometrical Parameters of Slub Yarn Using a Computer Vision Based Image Sequencing Technique
    Pomiar parametrów geometrycznych przędzy fantazyjnej za pomocą techniki sekwencjonowania obrazów opartej na obrazie komputerowym
    Autorzy:
    Li, Zhongjian
    Xiang, Jun
    Wang, Lei
    Zhang, Ning
    Wang, Jing-an
    Pan, Ruru
    Gao, Weidong
    Powiązania:
    https://bibliotekanauki.pl/articles/231514.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    slub yarn sequence image
    geometrical parameter measurement
    image segmentation
    image stitching
    przędza fantazyjna
    pomiary parametrów geometrycznych
    obraz komputerowy
    Opis:
    This article presents a computer vision method for measuring the geometrical parameters of slub yarn based on yarn sequence images captured from a moving slub yarn. An image segmentation method proposed by our earlier work was applied to segment sequence slub yarn images to obtain overlapping diameter data. Then an image stitching method was proposed to remove the overlapped data based on the normalised cross correlation (NCC) method. In order to detect the geometrical parameters of slub yarn, the frequency histogram, curve fitting , and spectrogram methods were adopted to analyse the sequence diameter data obtained. Four kinds of slub yarn with different geometrical parameters were tested using the method proposed and Uster method. The experimental results show that the detection results for slub amplitude, slub length, slub distance, and slub period obtained using the method proposed were consistent with the set values and Uster results.
    W artykule przedstawiono komputerową metodę pomiaru parametrów geometrycznych przędzy fantazyjnej na podstawie sekwencjonowania obrazów. Metoda segmentacji obrazu zaproponowana we wcześniejszej pracy została zastosowana do obrazów przędzy fantazyjnej w celu uzyskania danych dotyczących pomiarów średnicy. Następnie, w celu usunięcia nakładających się danych, zaproponowano metodę obróbki obrazu opartą o znormalizowaną metodę korelacji krzyżowej (NCC). W celu wykrycia parametrów geometrycznych przędzy fantazyjnej zastosowano histogram częstotliwości oraz dopasowanie krzywej i metody spektrogramowe do analizy uzyskanych danych. Za pomocą proponowanej metody i metody Uster przeanalizowano cztery rodzaje przędz fantazyjnych o różnych parametrach geometrycznych. Wyniki eksperymentalne wykazały, że wyniki detekcji amplitudy, długości, odległości i okresu wzgrubień uzyskane przy użyciu proponowanej metody były zgodne z wartościami zadanymi i wynikami Uster.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 3 (135); 26-35
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Color image encryption scheme based on quaternion discrete multi-fractional random transform and compressive sensing
    Autorzy:
    Ye, Huo-Sheng
    Dai, Jing-Yi
    Wen, Shun-Xi
    Gong, Li-Hua
    Zhang, Wen-Quan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033985.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    color image encryption
    quaternion discrete multi-fractional random transform
    compressive sensing
    confusion-diffusion strategy
    Opis:
    A color image compression-encryption algorithm by combining quaternion discrete multi-fractional random transform with compressive sensing is investigated, in which the chaos-based fractional orders greatly improve key sensitivity. The original color image is compressed and encrypted with the assistance of compressive sensing, in which the partial Hadamard matrix adopted as a measurement matrix is constructed by iterating Chebyshev map instead of utilizing the entire Guassian matrix as a key. The sparse images are divided into 12 sub-images and then represented as three quaternion signals, which are modulated by the quaternion discrete multi-fractional random transform. The image blocking and the quaternion representation make the proposed cryptosystem avoid additional data extension existing in many transform-based methods. To further improve the level of security, the plaintext-related key streams generated by the 2D logistic-sine-coupling map are adopted to diffuse and confuse the intermediate results simultaneously. Consequently, the final ciphertext image is attained. Simulation results reveal that the proposed cryptosystem is feasible with high security and has strong robustness against various attacks.
    Źródło:
    Optica Applicata; 2021, 51, 3; 349-364
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recovery of Proteins from Sweet Potato Cell Liquid by Acidification via Inoculation-Enhanced Fermentation and Determination of Functional Properties of Protein Products
    Autorzy:
    Li, Qingshuai
    Liu, Liping
    Han, Yanlei
    Zhao, Xiangying
    Yao, Mingjing
    Ma, Jing
    Han, Mo
    Zhang, Jiaxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/28408449.pdf
    Data publikacji:
    2024-02-09
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    sweet potato proteins
    Leuconostoc citreum
    protein precipitation
    digestibility
    emulsification
    foaming
    Opis:
    Starch production from fresh sweet potatoes generates process wastewater called sweet potato cell liquid (SPCL), which is rich in sweet potato protein (SPP). Currently, the commonly used protein recovery methods, such as isoelectric point precipitation and ultrafiltration, were not suitable for SPP recovery due to the low protein content of SPCL and the high cost of recovery. The feasibility of recovering SPP by SPCL acidification via inoculation-assisted fermentation was investigated in this study. The results indicated that the pH of SPCL could be reduced to approximately 4.0 within 6 h of fermentation with inoculation, resulting in an SPP extraction yield of 55.45% and purity of 66.23 g protein/100 g. With the addition of heating treatment, the extraction yield of SPP increased to 76.97–95.34%, while it maintained the purity of 66.36–70.12 g protein/100 g. The composition analysis revealed that SPP products contained sugars (below 11.5 g/100 g) in addition to protein and trace amounts of lignin and phenolics. Functional properties analysis showed that the SPP recovered by inoculation-enhanced fermentation exhibited better emulsifying and foaming properties, and higher digestibility compared to the SPP precipitated using hydrochloric acid. The method of extracting SPP from SPCL by inoculation-enhanced fermentation, as developed in this study, was a straightforward and cost-effective process that fosters significant potential for industrial applications.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 49-58
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    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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