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Wyświetlanie 1-15 z 33
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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
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