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Tytuł:
Three-Seas Initiative countries and their competitiveness in Europe
Kraje inicjatywy Trójmorza i ich konkurencyjność w Europie
Autorzy:
Wierzbiński, Bogdan
Surmacz, Tomasz
Wei, Li
Powiązania:
https://bibliotekanauki.pl/articles/548254.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
regional development
regional competitiveness
evolution of economics processes
rozwój regionalny
konkurencyjność regionów
ewolucja procesów ekonomicznych
Opis:
The paper shows the regional characteristics of the Three-Seas area in terms of defining the competitive advantage of the whole region and its countries through the development of relationships and changes in their approaches to the competitive paradigm in this area. The scientific discussion undertaken in this paper is related to internal resources in terms of ICT and human resources development (and its involvement in science and technology – measured by Human Resources for science and technology) as well as innovativeness. The authors have chosen indicators of development that could be beneficial in terms of decreasing historical economic developmental inequalities, with some differences between the Three-Seas countries being analysed for the period of 2006–2018. The secondary data was taken from Eurostat and other available sources. The regional strategy should focus on the knowledge-based economy, and the possibilities for rapid development in this area. This gives opportunities to make rapid progress in a region centrally located in Europe to generate great potential to strengthen accumulated resources and, in the nearest future, to create the possibility of becoming a hub connecting eastern and western Europe.
W pracy przedstawiono regionalną charakterystykę obszaru Trójmorza pod względem określania przewagi konkurencyjnej całego regionu i jego krajów poprzez rozwój relacji i zmianę podejścia do konkurencyjnego paradygmatu tego obszaru. Dyskusja naukowa podjęta w tym artykule odnosi się do zasobów wewnętrznych związanych z rozwojem ICT i potencjału ludzkiego (i jego wpływu na naukę i technologię – mierzoną przez HRSC, czyli Human resources for science and technology), a także z innowacyjnością. Autorzy wybrali wskaźniki rozwoju, które mogą być korzystne pod względem zmniejszania historycznych nierówności rozwojowych pod względem gospodarczym, a różnice między krajami Trójmorza zostały przeanalizowane dla lat 2006–2018. Dane wtórne pochodzą z Eurostatu i innych dostępnych źródeł. Strategia regionalna powinna koncentrować się na gospodarce opartej na wiedzy, dającej możliwości rozwoju tego obszaru. Daje to możliwość szybkiego rozwoju regionu o centralnej lokalizacji w Europie, co stwarza doskonałą okazję do wzmocnienia zakumulowanych zasobów, a w najbliższej przyszłości daje szansę na stanie się łącznikiem między wschodem a zachodem w Europie.
Źródło:
Nierówności Społeczne a Wzrost Gospodarczy; 2020, 62; 75-88
1898-5084
2658-0780
Pojawia się w:
Nierówności Społeczne a Wzrost Gospodarczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sound on standing postural stability in the elderly with and without knee osteoarthritis
Autorzy:
Hengsomboon, Pichaya
Hiengkaew, Vimonwan
Hsu, Wei-Li
Bovonsunthonchai, Sunee
Powiązania:
https://bibliotekanauki.pl/articles/306232.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
starzenie się
choroba zwyrodnieniowa
staw kolanowy
ageing
auditory
balance
knee osteoarthritis
sensory reweighting
Opis:
The aim of the study was to investigate the influence of sound on standing postural control in the elderly with and without knee osteoarthritis (knee-OA). Methods: Twenty-six elderly with knee-OA and 26 elderly without knee-OA who matched the age and height participated in this study. The standing postural stability was assessed by the 3D motion analysis system. Four testing conditions of the combination of sound (no sound and white noise sound) and surface (firm and soft surfaces) were tested three times with eyes closed for 30 sec. Postural stability variables included the standard deviation and velocity of the centre of pressure, the total body centre of mass, and centre of the head along the antero-posterior (AP) and medio-lateral (ML) directions. Results: Statistical significant reductions of all variables along ML direction were found in the elderly without a knee-OA in the presence of sound during standing on a firm surface. No significant effect of sound was found in the elderly with the knee-OA during standing on a firm surface. In the standing on a soft surface, both groups demonstrated no significant effect of sound on all postural stability variables. Conclusions: Application of sound improved the standing postural stability in the frontal plane for the elderly without knee-OA. However, the effect of sound was limited in standing on a soft surface for both elderly with and without knee-OA.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 3; 99-108
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Graphs Whose Permanental Polynomials Are Symmetric
Autorzy:
Li, Wei
Powiązania:
https://bibliotekanauki.pl/articles/31342428.pdf
Data publikacji:
2018-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
permanental polynomial
rooted product
matching
Opis:
The permanental polynomial $ \pi (G,x) = \Sigma_{i=0}^n b_i x^{n − i} $ of a graph G is symmetric if $ b_i = b_n−i $ for each $i$. In this paper, we characterize the graphs with symmetric permanental polynomials. Firstly, we introduce the rooted product $ H(K) $ of a graph $ H $ by a graph $ K $, and provide a way to compute the permanental polynomial of the rooted product $ H(K) $. Then we give a sufficient and necessary condition for the symmetric polynomial, and we prove that the permanental polynomial of a graph $ G $ is symmetric if and only if $ G $ is the rooted product of a graph by a path of length one.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 1; 233-243
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the output characteristics of photovoltaic arrays under partial shading conditions based on peak point approximate calculation method
Autorzy:
Wei, Liming
Li, Kaikai
Powiązania:
https://bibliotekanauki.pl/articles/2086691.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
– characteristic equation
peak point approximate calculation method
peak voltage point
shadow occlusion’s rate
type of illumination distribution
Opis:
The mismatch effect of photovoltaic (PV) arrays due to different illumination intensity has a significant impact on the output characteristics and output power of PV arrays, which is crucial to understand the output characteristics of PV arrays and optimize the array configuration in order to improve the value of the maximum power point. This paper illustrates the short-circuit current mismatch of series circuits, and the open-circuit voltage mismatch of parallel circuits and proposes corresponding solutions for each mismatch phenomenon. The output characteristics of multi-stage series PV arrays and multi-stage parallel PV arrays under complex illumination are analyzed by using the peak point approximation calculation method, and the distribution law of peak voltage points as well as the I-V (Current-Voltage) characteristic equation of each operating section are proposed. On this basis, the output characteristics of 3 x 3 centralized PV arrays are analyzed and verified by simulation. By comparing series and parallel PV arrays with the same condition, as well as several groups of centralized PV arrays with the same topology and different types of illumination distribution, this paper proposes a configuration optimization method for PV arrays. Matlab/Simulink simulation results confirm that the output power of parallel arrays is greater than that of series arrays under the same configuration and illuminationt distribution type, and the peak point is less than that of series arrays under the same configuration and lighting conditions; while in centralized PV arrays, the fewer series modules are shaded, the greater the output power and the less the peak point.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 409--424
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Ni60/SiO2 Coating Prepared by the Pyrolysis Products of Rice Husk
Autorzy:
Wei, Chunxue
Li, Hongbing
Powiązania:
https://bibliotekanauki.pl/articles/2203726.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni60/SiO2
coating
rice husk
hardness
wear
Opis:
Surface coating technology, as the main technology to improve the fatigue life of mechanical systems, has been well applied in mechanical equipment. The present study aimed to explore low-cost surface coating preparation technology using inexpensive rice husk as the research object, and the pyrolysis process behavior of rice husk was analyzed. The Ni60/SiO2 coating was prepared on the surface of the 45# steel substrate using the pyrolysis product SiO2 fiber as the reinforcing phase and supersonic plasma-spraying equipment. The results showed no defects such as cracks, pores, and inclusions in the prepared coating. The nanohardness of the Ni60/SiO2 coating reached 6506 μN, and the average friction coefficient reached 0.42. In the friction-and-wear experiment, the Ni60/SiO2 coating was manifested as an abrasive wear mechanism.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 37--42
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved linear complexities of the frequency hopping sequences in two optimal sets
Autorzy:
Gao, J.
Li, X.
Wei, Y.
Powiązania:
https://bibliotekanauki.pl/articles/206234.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
frequency hopping sequence
linear complexity
permutation polynominal
optimal set
Opis:
For the anti-jamming purpose, high linear complexity is desired for each frequency hopping sequence in an optimal set. Using a proper power permutation, Wang has shown that an optimal set of frequency hopping sequences with small linear complexity can be transformed into a new optimal set of frequency hopping sequences with large linear complexity. This paper conains two results. First, we extend the result of Wang. A power permutation is only suitable for a special construction of optimal set of frequency hopping sequences, see Wang (2011). However, the power permutation chosen in this paper applies to the general construction of optimal set of frequency hopping sequences. Second, by using a binomial permutation polynomial P(x), which is different from those permutations used before, we obtain a novel optimal set of frequency hopping sequences with high linear complexity from an optimal set of frequency hopping sequences with small linear complexity. By counting the number of different roots in the sequence representation, we determine the linear complexities of the frequency hopping sequences in two optimal sets transformed by the power permutation or binomial permutation.
Źródło:
Control and Cybernetics; 2012, 41, 2; 317-334
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pilling Performance of Cashmere Knitted Fabric of Woollen Ring Yarn and Mule Yarn
Pilling dzianin kaszmirowych wykonanych z wełnianych przędz obrączkowych i wózkowych
Autorzy:
Li, L.
Zhu, M.
Wei, X
Powiązania:
https://bibliotekanauki.pl/articles/231821.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cashmere knitted fabric
ring yarn
mule yarn
pilling
kaszmirowe dzianiny
przędza ring
przędza muł
mechacenie
Opis:
The yarn for cashmere knitted fabric is mainly processed by ring spinning and mule spinning. In this paper, four kinds of cashmere dye colours (red, black, grey, and beige) were selected to compare the pilling performance of cashmere knitted fabric of mule yarn and ring yarn. The pilling rates of the fabrics for different colours and spinning methods were tested using ICI’s Pilling Box, and the worn-off weight of the pill and fuzz for each sample was measured using an electronic balance. The results showed that the pilling rate of cashmere knitted fabric of mule yarn is higher than that of ring yarn, and that the worn-off weight of cashmere knitted fabric of mule yarn is less than that of ring yarn.
Przędze przeznaczone dla dzianin kaszmirowych są głównie produkowane na przędzarkach obrączkowych i wózkowych. W pracy badano przędze barwione czterema kolorami (czerwony, czarny, szary i beż). Pilling dzianin wykonanych z przędz o czterech kolorach i na dwóch rodzajach przędzarek sprawdzono za pomocą „ICI Pilling Box”, za pomocą ważenia dzianin oraz wytworzonego puchu pil każdej z próbek. Stwierdzono, że pilling dzianin wykonanych z przędz przędzarek wózkowych jest większy niż z przędz obrączkowych.
Źródło:
Fibres & Textiles in Eastern Europe; 2014, 1 (103); 74-75
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Note on the Permanental Roots of Bipartite Graphs
Autorzy:
Zhang, Heping
Liu, Shunyi
Li, Wei
Powiązania:
https://bibliotekanauki.pl/articles/30147218.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
permanent
permanental polynomial
permanental roots
Opis:
It is well-known that any graph has all real eigenvalues and a graph is bipartite if and only if its spectrum is symmetric with respect to the origin. We are interested in finding whether the permanental roots of a bipartite graph G have symmetric property as the spectrum of G. In this note, we show that the permanental roots of bipartite graphs are symmetric with respect to the real and imaginary axes. Furthermore, we prove that any graph has no negative real permanental root, and any graph containing at least one edge has complex permanental roots.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 49-56
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On controllability for fractional differential inclusions in Banach spaces
Autorzy:
Wang, J.
Li, X.
Wei, W.
Powiązania:
https://bibliotekanauki.pl/articles/256046.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
controllability
fractional differential inclusions
Bohnenblust-Karlin's fixed point theorem
Opis:
In this paper, we investigate the controllability for systems governed by fractional differential inclusions in Banach spaces. The techniques rely on fractional calculus, multivalue mapping on a bounded set and Bohnenblust-Karlin's fixed point theorem.
Źródło:
Opuscula Mathematica; 2012, 32, 2; 341-356
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Academic and linguistic gains during a semester long study abroad: A cohort case study
Autorzy:
Cai, Wei
Li, Xiangrong
Liu, Meihua
Powiązania:
https://bibliotekanauki.pl/articles/780741.pdf
Data publikacji:
2013-12
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
gain
exchange program
academic
linguistic
Opis:
The present case study investigated university students’ academic and linguistic gains during a semester-long exchange program abroad. Thirty three third-year English majors from a Chinese university answered a battery of questionnaires and 13 of them participated in semi-structured interviews both prior to and after the program. Analyses of the data showed that the participants gained greatly from the exchange program both academically and linguistically. Based on the findings, some implications about exchange programs are discussed.
Źródło:
Studies in Second Language Learning and Teaching; 2013, 3, 4; 505-522
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Band Calculations on the Upper Critical Fields of Iron Pnictide Superconductor $Ba(Fe_{1-x}Ni_x)_2As_2$ (x=0.072)
Autorzy:
Huang, Hai
Lv, Peng-Li
Li, Wei-Feng
Liu, Peng
Powiązania:
https://bibliotekanauki.pl/articles/1399148.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
Opis:
Based on two-band Ginzburg-Landau theory, we study the upper critical fields for the overdoped composition of the iron-based superconductor $Ba(Fe_{1-x}Ni_x)_2As_2$ with x=0.072. All the temperature and angular results of this compound are consistent with the experimental data. Thus our analysis strongly suggests that $Ba(Fe_{1-x}Ni_x)_2As_2$ in the overdoped regime is a two-gap superconductor.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 799-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Airflow Background Noise Suppression for Aeroacoustic Wind Tunnel Testing
Autorzy:
Li, Yuanwen
Li, Min
Feng, Daofang
Yang, Debin
Wei, Long
Powiązania:
https://bibliotekanauki.pl/articles/2141671.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aeroacoustic measurement
acoustic source localization
EEMD; background noise suppression
wind tunnel test.
Opis:
The microphone data collected in aeroacoustic wind tunnel test contains not only desired aeroacoustic signal but also background noise generated by the jet or the valve of the wind tunnel, so the desired aeroacoustic characteristics is difficult to be highlighted due to the low Signal-to-Noise Ratio (SNR). Classical cross spectral matrix removal can only reduce the microphone self-noise, but its effect is limited for jet noise. Therefore, an Airflow Background Noise Suppression method based on the Ensemble Empirical Mode Decomposition (ABNSEEMD) is proposed to eliminate the influence of background noise on aeroacoustic field reconstruction. The new method uses EEMD to adaptively separate the background noise in microphone data, which has good practicability for increasing SNR of aeroacoustic signal. A localization experiment was conducted by using two loudspeakers in wind tunnel with 80 m/s velocity. Results show that proposed method can filter out the background noise more effectively and improve the SNR of the loudspeakers signal compared with spectral subtraction and cepstrum methods. Moreover, the aeroacoustic field produced by a NACA EPPLER 862 STRUT airfoil model was also measured and reconstructed. Delay-and-sum beamforming maps of aeroacoustic source were displayed after the background noise was suppressed, which further demonstrates the proposed method’s advantage.
Źródło:
Archives of Acoustics; 2022, 47, 2; 241-257
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative evaluation of wear behavior of tribo-pairs in reciprocating pumps with multiple materials under different conditions
Autorzy:
Li, Ran
Wei, Wenshu
Liu, Hao
Wang, Dalong
Ye, Jian
Li, Shoubin
Wang, Wei
Wu, Huigang
Powiązania:
https://bibliotekanauki.pl/articles/2200870.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
reciprocating pump
tribo-pair
cast iron pin
wear behavior
wear resistance
Opis:
In the study of wear behavior of tribo-pairs in reciprocating pumps, the tribo-pairs can be considered as contact pairs consisting of a disc and pin. In this paper, pin-on-disc wear tests were carried out by using two types of cast iron pin specimens with different materials. Additionally, the effects of the lubrication condition, test load, diamond-like carbon (DLC) coating and plateau honing cross-hatch pattern on wear behavior of the tribo-pairs were investigated. Experimental results based on surface topography analysis and scanning elec- tron micrograph (SEM) analysis show that the lubricant and DLC coating have a positive effect on wear resistance of test specimens. Disc specimens of three material types (i.e. ISO 185/JL/250, tin-bronze, zirconia) are able to show good anti-wear behavior. The tribo-pairs composed of spheroidal graphite cast irons as well as implementation of the plateau honing cross hatch on disc specimens have no significant effect on the wear resistance. The Archard model was used to estimate abrasive wear under dry conditions, which was over-predicted compared to the experimental results.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 77--87
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Triplex qRT-PCR with specific probe for synchronously detecting Bovine parvovirus, bovine coronavirus, bovine parainfluenza virus and its applications
Autorzy:
Geng, J.
Niu, Y.
Wei, L.
Li, Q.
Gong, Z.
Wei, S.
Powiązania:
https://bibliotekanauki.pl/articles/2087278.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bovine parvovirus
bovine coronavirus
bovine parainfluenza virus
qRT-PCR
specificity
sensitivity
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utility optimization-based bandwidth allocation for elastic and inelastic services in peer-to-peer networks
Autorzy:
Li, Shiyong
Zhang, Yue
Wang, Yan
Sun, Wei
Powiązania:
https://bibliotekanauki.pl/articles/330690.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
peer-to-peer network
bandwidth allocation
elastic services
inelastic services
utility function
sieć peer-to-peer
alokacja przepustowości
funkcja użyteczności
Opis:
This paper considers reasonable bandwidth allocation for multiclass services in peer-to-peer (P2P) networks, measures the satisfaction of each peer as a customer by a utility function when acquiring one service, and develops an optimization model for bandwidth allocation with the objective of utility maximization. Elastic services with concave utilities are first considered and the exact expression of optimal bandwidth allocation for each peer is deduced. In order to obtain an optimum in distributed P2P networks, we develop a gradient-based bandwidth allocation scheme and illustrate the performance with numerical examples. Then we investigate bandwidth allocation for inelastic services with sigmoidal utilities, which is a nonconvex optimization problem. In order to solve it, we analyze provider capacity provisioning for bandwidth allocation of inelastic services and modify the update rule for prices that service customers should pay. Numerical examples are finally given to illustrate that the improved scheme can also efficiently converge to the global optimum.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 1; 111-123
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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