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Wyświetlanie 1-15 z 198
Tytuł:
Nowe tendencje edukacji pedagogicznej w Polsce i na Ukrainie w zmieniającej się rzeczywistości
The new trends of higher pedagogical education in Poland and Ukraine in the changing reality
Autorzy:
Bąk, M.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/323988.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
globalizacja
innowacje edukacyjne
europejska przestrzeń edukacyjna
globalization
educational innovations
European educational area
Opis:
Artykuł dotyczy problematyki kształcenia studentów wyższych uczelni pedagogicznych w kontekście rozwoju i modernizacji systemu szkolnictwa wyższego. Podstawowym czynnikiem wymuszających zmiany są procesy związane z globalizacją, takie jak zmiana stylu życia związana ze wzrostem tempa interakcji społecznej pod wpływem nowych technologii, migracją ludności, transferem usług oraz unifikacja kulturową wynikającą z kopiowania modelów konsumpcji i nieograniczonego rozprzestrzeniania idei. Wobec tych gwałtownie przebiegających zmian, jednym z najważniejszych zadań dla kształcenia pedagogicznego wydaje się stworzenie systemu profesjonalnej edukacji nauczyciela potrafiącego sprostać przyszłym wyzwaniom. W artykule przedstawiono priorytety i innowacje wprowadzane w tym zakresie na Ukrainie w odniesieniu do polskiego systemu edukacji i europejskich rozwiązań. Zwrócono uwagę na ich znaczenie w myśleniu o polityce edukacyjnej i formowaniu elementów strukturalnych systemu kształcenia oraz wpływ na rozwój wiedzy społeczeństwa.
The article deals with the problem of professional education of students of pedagogical universities. It is emphasized that an important task of pedagogical science is the development of a system for the modernization of university education. The basis and main stimulus of this process is globalization, a new world trend through which the way of life, the spread of consumer goods and ideas become standardized throughout the world. The main directions of the national priorities Ukrainian innovations and their importance for the Polish education system are presented. The areas of the Ukrainian-Polish cooperation of educational systems in the context of modern innovations and in the sphere of the European priorities are considered. Attention is drawn to the importance of thinking about educational policy and forming structural elements of the education system and the impact on the development of a knowledge society.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 123; 13-25
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and analysis of coastal waves along the north sea area of China
Autorzy:
Sun, S.
Li, H.
Sun, H.
Powiązania:
https://bibliotekanauki.pl/articles/259794.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
coastal wave
measurement
buoy
spectral analysis
Opis:
Taking advantage of coastal wave environment to carry out scaled ship model test is an effective testing technology for ship performance. In this paper, the method of spectral analysis is adopted to calculate the significant wave height, period, wave spectrum and some other parameters of some places along the North Sea area of China. The measured wave spectrum and the ocean spectrum are handled into non-dimensional form to evaluate their similarity. The influence of wind direction and tide on coastal waves was analyzed. And the results indicate that the coastal wave spectrum is similar to the ocean spectrum under some specific conditions.
Źródło:
Polish Maritime Research; 2016, 3; 72-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on green water of tumblehome hull using dam-break flow and RANSE models
Autorzy:
Sun, S.
Du, W.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/259806.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
tumblehome hull
Green water
Dam-break flow
RANSE
Opis:
The tumblehome hull adopts some novelty designs such as low-tumblehome freeboard and wave-piercing bow. The new form design makes the ship have many special hydrodynamic performances. Especially the green water of tumblehome hull is different from that of hulls with flare free board. Green water is a strong nonlinear phenomenon of ship-wave interaction, the variation of free surface of liquid is complicated, and there are still some difficulties to solve green water problems well with numerical simulation method. In this paper firstly the motion responses of the tumblehome hull was calculated based on 3D potential theory, and then the dam-break flow model was used to calculate green water height and pressure distribution. According to the result of numerical simulation, some typical working conditions are chosen for 3D CFD simulation using RANS method. The results of numerical simulation methods are compared with the experimental results measured in towing tank. The influence of different ship form parameters and wave parameters to the green water of tumblehome hull is analyzed, and some regularities of green water on tumblehome hull in regular waves are summarized.
Źródło:
Polish Maritime Research; 2017, S 2; 172-180
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability modeling of fault tolerant control systems
Autorzy:
Li, H.
Zhao, Q.
Yang, Z.
Powiązania:
https://bibliotekanauki.pl/articles/929822.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie tolerujące uszkodzenia
ocena niezawodności
procesy semimarkowskie
fault tolerant control
reliability evaluation
semi-Markov processes
Opis:
This paper proposes a novel approach to reliability evaluation for active Fault Tolerant Control Systems (FTCSs). By introducing a reliability index based on the control performance and hard deadline, a semi-Markov process model is proposed to describe system operation for reliability evaluation. The degraded performance of FTCSs in the presence of imperfect Fault Detection and Isolation (FDI) is reflected by semi-Markov states. The semi-Markov kernel, the key parameter of the process, is determined by four probabilistic parameters based on the Markovian model of FTCSs. Computed from the transition probabilities of the semi-Markov process, the reliability index incorporates control objectives, hard deadline, and the effects of imperfect FDI, a suitable quantitative measure of the overall performance.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 491-504
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil-assisted flotation of fine hematite using sodium oleate or hydroxamic acids as a collector
Autorzy:
Li, H.
Liu, M.
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/109749.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hematite
sodium oleate
kerosene
Batch Flotation
Octyl hydroxamic acid
Oleoyl hydroxamic acid
Opis:
Micro-flotation and batch flotation tests were carried out on fine (-20 µm) hematite to investigate the influences of non-polar oil when sodium oleate, octyl hydroxamic acid, or oleoyl hydroxamic acid was used as a collector. Both micro-flotation and batch flotation tests were performed using single hematite mineral and/or artificial mixed minerals (hematite:quartz = 1:1), and kerosene was utilized as the neutral oil. The experimental results showed that the addition of a kerosene emulsion benefited hematite recovery in the micro-flotation tests where a froth layer did not exist. In the batch flotation where a froth layer existed, kerosene behaved differently when used in conjunction with the three collectors. Kerosene helped improve the batch flotation when sodium oleate or oleoyl hydroxamic acid was used as a collector. However, it reduced concentrate weight yield, grade and recovery to a noticeable extent when octyl hydroxamic acid was used as a collector, especially at low dosages. In addition, single hematite batch flotation kinetics tests coupled with water recovery measurement were carried out to study the role of kerosene at different collector dosages. It was observed that water drainage and the resulting froth destabilization by kerosene was dominant at low collector dosages, especially in the flotation using octyl hydroxamic acid. At higher collector dosages, the water drainage and froth destabilization effect by kerosene was possibly counter-balanced by the higher hematite surface hydrophobicity and bubble surface tension gradient, which led to more stable froth layer.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1130-1145
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Fuzzy Iterative Learning Control Algorithm for Single Joint Manipulator
Autorzy:
Wang, M.
Bian, G.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/229401.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iterative learning control
fuzzy control
fuzzy gain adjustment
single joint manipulator
Opis:
This paper present a new fuzzy iterative learning control design to solve the trajectory tracking problem and performing repetitive tasks for rigid robot manipulators. Several times’ iterations are needed to make the system tracking error converge, especially in the first iteration without experience. In order to solve that problem, fuzzy control and iterative learning control are combined, where fuzzy control is used to tracking trajectory at the first learning period, and the output of fuzzy control is recorded as the initial control inputs of ILC. The new algorithm also adopts gain self-tuning by fuzzy control, in order to improve the convergence rate. Simulations illustrate the effectiveness and convergence of the new algorithm and advantages compared to traditional method.
Źródło:
Archives of Control Sciences; 2016, 26, 3; 297-310
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free Volume Study on Three Types of Shape Memory Polymers by Positron Annihilation
Autorzy:
Ujihira, Y.
Li, H.-L.
Ito, K.
Powiązania:
https://bibliotekanauki.pl/articles/2008187.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Pf
Opis:
Temperature dependence of nanoscopic environment of shape memory polymers such as polynorbornene (T$\text{}_{g}$≈313 K), polyurethane (T$\text{}_{g}$≈321 K=dynamic viscoelasticity, destruction of hydrogen bond ≈353 K) and styrene-butadiene copolymer (T$\text{}_{m}$=333 K) is observed in terms of free volume parameters - average size, numerical concentration and size distribution - estimated from positronium lifetime measurement, and mechanisms of their shape recoveries are discussed at a molecular level.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 677-682
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacturing and Flat-wise Compression Performance of Modified 3D Integrated Sandwich Fabric Composites
Wytwarzanie modyfikowanych zintegrowanych tekstylnych kompozytów i ich zachowanie podczas ściskania płaskiego
Autorzy:
Yu, K
Cao, H
Qian, K
Li, H
Powiązania:
https://bibliotekanauki.pl/articles/232962.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
three-dimensional
inside layer structure
flatwise compression
integrated sandwich fabric composites
przestrzenne warstwy tkanin
kształt struktury
zintegrowane kompozyty
wielowarstwowe tkaniny
płaskie ściskanie
Opis:
In this study, a novel manufacturing technique for three-dimensional integrated sandwich fabric with an ‘8’-shaped inside layer structure was developed. Furthermore a new integrated sandwich fabric with an ‘88’-shaped inside layer structure was designed in comparison with the ‘8’-shaped inside layer structure. The flatwise compression characteristics of the three-dimensional integrated sandwich fabric composites with different inside layer angles, inside layer heights and inside layer structures were investigated. The results showed that the inside layer structure of integrated sandwich fabric composites woven by the double rapier technique stand more uprightly than those woven by the traditional velvet weaving technique. What is more the corresponding flatwise compression performance was also greatly improved. Furthermore compared to ‘8’-shaped inside layer structure composites, ‘88’-shaped inside layer structure composites can not only retain the majority of pores but also greatly improve the flatwise compression performance of the composites.
W pracy przedstawiono nową technikę wytwarzania przestrzennych zintegrowanych warstwowych tkanin o strukturze stosu w kształcie “8”. Następnie zaprojektowano nową warstwową tkaninę o strukturze stosu w kształcie „88” dla porównania ze strukturą „8”. Przebadano tkaniny warstwowe ze stosami o różnych kątach, wysokościach i strukturach. Wyniki wykazały, że struktura stosu zintegrowanej tkaniny warstwowej tkana techniką podwójnego rapieru jest bardziej prostopadła niż w przypadku tkania metodą tradycyjną. Niezależnie od tego wykazano, że tkaniny o stosie „88” nie tylko lepiej zachowują większość por, ale znacznie polepszają zachowanie się struktur podczas płaskiego ściskania.
Źródło:
Fibres & Textiles in Eastern Europe; 2014, 3 (105); 98-102
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed vigor, photosynthesis and early growth of saplings of different triploid Betula families
Autorzy:
Mu, H.
Jiang, J.
Li, H.
Liu, G.
Powiązania:
https://bibliotekanauki.pl/articles/41671.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
seed vigor
photosynthesis
early growth
sapling
triploid
Betula
birch
polyploidy
European aspen
aspen
Populus tremula
germination energy
Opis:
Breeding scientists have given extensive attention to triploids in trees because of their importance to forestry. Consequently, creating and breeding triploids of good quality has become one of purposes of tree breeding. We chose two autotetraploids (Betula platyphylla, named Q10 and Q65) as female parents and eight hybrid diploids (B. platyphylla × B. pendula, named F1 – F8) as male parents to obtain progenies through controllable pollination, resulting in triploid progenies. Germination rate and germination energy of triploid seeds of Q65 were significantly higher (P < 0.01) than in triploid seed s of Q10. Triploid families with Q65 as female parent had a large quantity of saplings, whereas triploid families with Q10 as female parent had a small quantity of saplings. Triploid families with Q65 as female parent were generally superior in base diameter and height to base diameter ratio when compared to a diploid family. Q65×F3 was preliminarily recognized as the superior family. These results demonstrate that the female parent has a major influence on triploid progenies, although the male parent also has a small influence. The results provided a reference to build seed orchards of triploid birch trees, choose tetraploids as female parents and forecast triploid families of good quality.
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spanning trees with a bounded number of leaves
Autorzy:
Cai, J.
Flandrin, E.
Li, H.
Sun, Q.
Powiązania:
https://bibliotekanauki.pl/articles/255239.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
spanning tree
implicit degree
leaves
Opis:
n 1998, H. Broersma and H. Tuinstra proved that: Given a connected graph G with n ≥ 3 vertices, if d(u) + d(y) ≥n — k + 1 for all non-adjacent vertices u and v of G (k ≥ 1), then G has a spanning tree with at most k leaves. In this paper, we generalize this result by using implicit degree sum condition of t (2≤ t ≤k) independent vertices and we prove what follows: Let G be a connected graph on n ≥ 3 vertices and k ≥ 2 be an integer. If the implicit degree sum of any t independent vertices is at least [formula] for (k≥ t ≥ 2), then G has a spanning tree with at most k leaves.
Źródło:
Opuscula Mathematica; 2017, 37, 4; 501-508
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of all-optical logic XOR gate based on linear optical amplifier cross-gain modulation
Autorzy:
Li, X
Jin, J
Li, H
Zhang, Q
Powiązania:
https://bibliotekanauki.pl/articles/174514.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
linear optical amplifier
cross-gain modulation
XOR gate
Opis:
All-optical logic is the key to future high speed and large capacity optical transmission, the realization of optical packet switching and optical computing, and it has a very profound influence on the development of future optical communication. A linear optical amplifier as a new type of semiconductor optical amplifier, which has a good gain characteristic, has better signal performance than a traditional semiconductor optical amplifier in the wavelength conversion. This article presents a numerical simulation model of all-optical logic XOR gate and its logic operation based on cross-gain modulation of linear optical amplifier, and has also completed some of the basic logic operations, including AND, OR, NOT operations.
Źródło:
Optica Applicata; 2015, 45, 4; 447-457
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloning and characterization of a pathogenesis-related gene (ThPR10) from Tamarix hispida
Autorzy:
Zhang, R.
Wang, Y.
Liu, G.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/19850.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
A PR10 gene (ThPR10) was cloned from Tamarix hispida and characterized. Real-time RT-PCR was employed to evaluate gene expression levels. ThPR10 was expressed in both leaves and roots of T. hispida under normal growth conditions, and can be highly induced in both leaf and root tissues by abiotic stresses including NaCl, PEG, cold, CdCl2, and ABA (abscisic acid) treatments. Our results indicated that ThPR10 is involved in the abiotic stress response, and regulated by an ABA-dependent signaling pathway. Subsequently, ThPR10 was localized at the subcellular level. The gene was fused with the GFP N-terminal driven by CaMV35S promoter and transiently expressed in onion epidermal cells. This strategy localized the ThPR10 protein to the nucleus of onion epidermal cells, suggesting that the pathogenesis-related proteins play a functional role in the cell nucleus.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2010, 52, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear drift of the spring gravimeter caused by air pressure from the kunming GS15 gravimeters
Autorzy:
Wei, J.
Shen, W.
Li, H.
Liu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/260586.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
GS15 gravimeter meter
air pressure admittance
nonlinear air pressure correction
superconducting gravimeter
Opis:
In order to monitor and correct the meteorological factors of the spring gravity meter, the characteristics of the time varying gravity changes caused by meteorological factors were analyzed. Kunming GS15 gravity meter from 2007 continuous gravity observation has been carried out with the sampling rate of the pressure observation. In this study, we first compare the effects of 4 types of gravity meter and 3 different types of stations on the gravity observed seasonal gravity signals. It is indicated that the observed seasonal gravity signal of the cave is only 1/10, and there is a constant temperature and constant pressure device. Compared with the same time, the gravity signal of the gravity signal is about 100 times smaller. The influence of the pressure load of the gravity meter is tested by using the theory of pressure. The results show that only the actual value of 2cpd - 3cpd pressure load varies from -0.395 to -0.280×10-8ms-2 , and the 1cpd to 1 cpm periodic partial type gravity meter is also in accordance with the law of gravity and air pressure. And with the characteristics of time lag. In this paper, the nonlinear zero drift parameters of the linear regression model with time lag and the time series of the GS15 gravity meter are used to simulate the nonlinear zero drift parameters of the gravity meter. The results show that the gravity signal contains time lag 35 hours, and the air pressure admittance is 0.8 × 10-8ms-2/mbar. The correlation can reach 79%. The gravity changes signal and satellite gravity as well as the gravity water load signal of the land water model are the same as the gravity water load signal in the autumn as the minimum value, and the seasonal variation of the maximum value of gravity in summer.
Źródło:
Polish Maritime Research; 2016, S 1; 180-186
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery mechanisms of sericite in microcrystalline graphite flotation
Autorzy:
Li, H.
Ou, L.
Feng, Q.
Chang, Z.
Powiązania:
https://bibliotekanauki.pl/articles/110055.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microcrystalline graphite
sericite
flotation
entrainment
entrapment
Opis:
Sericite is the main contaminant of concentrate in commercial microcrystalline graphite ore flotation. It was necessary to identify its recovery mechanisms so that the appropriate solution can be selected. In this study, the influence of sericite on flotation selectivity of microcrystalline graphite ore and its recovery mechanisms were investigated. Artificial mixtures flotation test suggested that sericite seriously reported into concentrate leading to poor flotation selectivity of microcrystalline graphite ore. However, the aggregation/dispersion behavior of artificial mixtures indicated that a large repulsive energy existed between sericite and microcrystalline graphite particles at pH 7.4, and sericite was not likely to report into graphite concentrate by slime coating. The results obtained from contact angle measurements and a technique of Warren showed that the floated sericite reached the froth via a combination of both entrainment and entrapment mechanisms, not via true flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 387-400
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of colloidal montmorillonite particles on froth flotation of graphite, galena and fluorite
Autorzy:
Chen, T.
Zhao, Y.
Li, H.
Song, S.
Powiązania:
https://bibliotekanauki.pl/articles/110589.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
montmorillonite
graphite
galena
fluorite
slime coating
entrainment
Opis:
The effect of colloidal montmorillonite (MMT) on froth flotation of graphite, galena and fluorite was investigated in this work. The results showed that the presence of sufficient amount of colloidal MMT particles in the mineral slurry would be detrimental of flotation by reducing the recovery of minerals. This observation was attributed to slime coating of MMT on the coarse valuable mineral particles and entrainment of MMT particles in the froth product together with water in the triangle froth zones. The former would reduce the recovery of the valuable minerals because of hydrophilic MMT coating. The latter would decrease the concentrate grade. The degree of slime coating depended on slurry pH, while the degree of entrainment was closely related to water recovery. It was also found that slime coating was a dominant factor in mineral flotation in acidic pH regions in the presence of colloidal MMT particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 699-713
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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