Autor: Li, W - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of exit blade angle, viscosity and roughness in centrifugal pumps investigated by CFD computation
Autorzy:: Li, W.
Powiązania:: https://bibliotekanauki.pl/articles/1934039.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Gdańska
Tematy:: centrifugal pump
impeller
volute
viscosity
performance
blade angle
viscous oil
Opis:: It has long been known that the exit blade angle plays a very important role in the performance of a centrifugal pump handling water or viscous oil. The effect of exit blade angle on the performance and flow of centrifugal pumps is usually investigated experimentally. However, due to the high cost and limited data that can be obtained by experiment, currently there is a great need for this effect to be studied numerically by means of computational fluid dynamics (CFD). At present, extensive comparisons between experiment and simulation regarding the performance of viscous oil and flow in centrifugal pumps with different exit blade angles are not available. Hydraulic performance and flow details in the impeller and the volute of a centrifugal pump with an exit blade angle of 44o were investigated numerically with the CFD code Fluent, using water and viscous oil as the working fluid, respectively. The effect of exit blade angle was then elucidated by comparing the performance and flow with that of a pump with an exit blade angle of 20o. It was determined that the results for the performance and flow obtained by means of CFD were in qualitative agreement with the observations. The sudden-rising-head effect is dependent on roughness and viscosity. The unstable zone in the theoretical head curve of the impeller at a low flow rate was attributed to the strong reaction of the volute to the flow in the vicinity of the impeller exit. The flow in the impeller with a large exit blade angle was subject to separation near the blade pressure side, however, a large exit blade angle helped improve the pump performance of viscous oil.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 1; 21-41
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Validating full cavitation model with an experimental centrifugal pump
Autorzy:: Li, W., -G.
Powiązania:: https://bibliotekanauki.pl/articles/1954444.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska
Tematy:: centrifugal pump
cavitation
incipient cavitatio
suction performance
net positive suction head required
net positive suction head available
CFD
Opis:: The full cavitation model is increasingly applied in the cavitating flow simulation and the cavitation performance prediction of a centrifugal pump to improve or optimize its hydraulic design. Since the model involves surface tension and non-condensable gas content, it can be potentially applied in predicting cavitation behaviour of a centrifugal pump when handling viscous oils that possess different surface tension and gas content than water. However, the model has not been validated extensively against experimental incipient cavitation and NPSHr (net positive suction head required) data so far. In the paper, the cavitation performance of an experimental centrifugal pump is investigated using the CFD code and the full cavitation model when pumping water. The incipient cavitation number-flow rate curve and head-NPSHa (net positive suction head available) relationship are established and compared with experimental observations. The relationship between the head and integrated vapour-liquid volume ratio in the impeller is argued. The influence of the non-condensable gas content and turbulence model on the head-NPSHa curve is clarified. The cavity pattern predicted is compared with the visualized one. The computational methods adopted and the results achieved here can be useful for the cavitation performance prediction of a centrifugal pump in engineering.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 1; 81-100
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Simulation on vessel intelligent collision avoidance based on artificial fish swarm algorithm
Autorzy:: Li, W.
Ma, W.
Powiązania:: https://bibliotekanauki.pl/articles/260153.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: simulation
collision avoidance
artificial fish swarm algorithm
Opis:: TAs the rapid development of the ship equipments and navigation technology, vessel intelligent collision avoidance theory was researched world widely. Meantime, more and more ship intelligent collision avoidance products are put into use. It not only makes the ship much safer, but also lighten the officers work intensity and improve the ship’s economy. The paper based on the International Regulation for Preventing Collision at sea and ship domain theories, with the ship proceeding distance when collision avoidance as the objective function, through the artificial fish swarm algorithm to optimize the collision avoidance path, and finally simulates overtaking situation, crossing situation and head-on situation three classic meeting situation of ships on the sea by VC++ computer language. Calculation and simulation results are basically consistent with the actual situation which certifies that its validity.
Źródło:: Polish Maritime Research; 2016, S 1; 138-143
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental Investigation on the Impact Behaviour of Composite Laminate
Eksperymentalne badania laminatów kompozytowych poddanych działaniu udaru
Autorzy:: Azzam, A
Li, W
Powiązania:: https://bibliotekanauki.pl/articles/233221.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:: stacking sequences
low velocity impact
C-scan
three-point bending
delamination
działanie udaru
laminaty kompozytowe
sekwencje układania
mały wpływ na prędkość
system trzech punktów
rozwarstwianie
Opis:: The impact response of a composite laminate structure was investigated by subjecting several stacking sequences of a composite laminate structure to low velocity impact loading using a Drop-Weight Machine (CEAST 9350 drop tower) and three-point bending using an electronic universal tester (Type: WDW-20) machine. The air-coupled ultrasonic C-scan technique (NAUT21) was selected in order to characterise the impact damage size, delamination, flaw detection, and damage in composite laminate structures. The failure processes of damaged specimens for impact energy (5 J) were evaluated by comparing load-displacement curves and images of damaged samples taken from impacted sides through a C-scan.
Badano odpowiedź na udar struktury laminatów kompozytowych. Zastosowano kilka sekwencji udarów charakteryzujących się małą prędkością. Stosowano specjalną maszynę umożliwiającą opadanie obciążenia (wieża udarowa). Zginanie następowało w systemie trzech punktów podparcia. Zastosowano sprzężoną technikę ultradzwiękowego skanowania dla scharakteryzowania wielkości uszkodzeń w wyniku udaru, delaminację warstw i zmiany strukturalne. Dla scharakteryzowania uszkodzeń materiału badawczego powstałych przy energii udaru 5J wykorzystano porównanie wykresów obciążenie-przesunięcie i zdjęć uszkodzonych próbek.
Źródło:: Fibres & Textiles in Eastern Europe; 2015, 1 (109); 77-84
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Research on intelligent avoidance method of shipwreck based on bigdata analysis
Autorzy:: Li, W.
Huang, Q.
Powiązania:: https://bibliotekanauki.pl/articles/260002.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: big data analysis
shipwreck
intelligent avoidance
genetic algorithm
Opis:: In order to solve the problem that current avoidance method of shipwreck has the problem of low success rate of avoidance, this paper proposes a method of intelligent avoidance of shipwreck based on big data analysis. Firstly,our method used big data analysis to calculate the safe distance of approach of ship under the head-on situation, the crossing situation and the overtaking situation.On this basis, by calculating the risk-degree of collision of ships,our research determined the degree of immediate danger of ships.Finally, we calculated the three kinds of evaluation function of ship navigation, and used genetic algorithm to realize the intelligent avoidance of shipwreck.Experimental result shows that compared the proposed method with the traditional method in two in a recent meeting when the distance to closest point of approach between two ships is 0.13nmile, they can effectively evade.The success rate of avoidance is high.
Źródło:: Polish Maritime Research; 2017, S 3; 113-120
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Identifying Training Deficiencies in Military Pilots by Applying the Human Factors Analysis and Classification System
Autorzy:: Li, W. C.
Harris, D.
Powiązania:: https://bibliotekanauki.pl/articles/90259.pdf
Data publikacji:: 2013
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: accident investigation
error analysis
human error
human factors analysis and classification system (HFACS)
training development
piloci samolotów
czynnik ludzki
klasyfikacja
przyczyny wypadków
wojsko
badanie wypadków
błędy ludzkie
trening
Opis:: Without accurate analysis, it is difficult to identify training needs and develop the content of training programs required for preventing aviation accidents. The human factors analysis and classification system (HFACS) is based on Reason's system-wide model of human error. In this study, 523 accidents from the Republic of China Air Force were analyzed in which 1762 human errors were categorized. The results of the analysis showed that errors of judgment and poor decision-making were commonly reported amongst pilots. As a result, it was concluded that there was a need for military pilots to be trained specifically in making decisions in tactical environments. However, application of HFACS also allowed the identification of systemic training deficiencies within the organization further contributing to the accidents observed.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 3-18
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Quadratic performance analysis of switched affine time-varying systems
Autorzy:: Li, W.
Huang, C.
Zhai, G.
Powiązania:: https://bibliotekanauki.pl/articles/330032.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: switched affine system
time varying system
quadratic stabilization
tracking
L2 gain
switching law
differential LMIs
observer
system zmienny w czasie
stabilizacja kwadratowa
śledzenie
obserwator
Opis:: We analyze quadratic performance for switched systems which are composed of a finite set of affine time-varying subsystems, where both subsystem matrices and affine vectors are switched, and no single subsystem has desired quadratic performance. The quadratic performance indexes we deal with include stability, tracking and L₂ gain. We show that if a linear convex combination of subsystem matrices is uniformly Hurwitz and another convex combination of affine vectors is zero, then we can design a state-dependent switching law (state feedback) and an output-dependent switching law (output feedback) such that the entire switched affine system is quadratically stable at the origin. In the case where the convex combination of affine vectors is nonzero, we show that the tracking control problem can be posed and solved using a similar switching strategy. Finally, we consider the L₂ gain analysis problem for the switched affine time-varying systems under state feedback.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 429-440
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Wpływ kondycjonowania na kiełkowanie i wigor nasion bratka ogrodowego (Viola x wittrockiana Gams.)
The effect of priming on germination and vigour of pansy (Viola x wittrockiana Gams.) seeds
Autorzy:: Dorna, H.
Li, W.
Szopińska, D.
Powiązania:: https://bibliotekanauki.pl/articles/11542861.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:: priming
germination
vigor
seed
pansy
Viola x wittrockiana
germination capacity
Opis:: Porównywano wpływ trzech metod kondycjonowania: hydrokondycjonowania, kondycjonowania w solach mineralnych oraz osmokondycjonowania na kiełkowanie i wigor nasion fiołka ogrodowego w temperaturze 20, 30 i 35°C. Nasiona hydrokondycjonowano w ograniczonej ilości wody (600 i 700 μl H2O·g nasion-1, 2, 3 lub 4 dni), kondycjonowano w roztworze KNO3 (-1.5 MPa, 5 dni) oraz osmokondycjonowano w roztworach glikolu polietylenowego (-1,0, -1,25 lub -1,5 MPa PEG 8000, 7 dni) w temperaturze 15 lub 20°C. Oceniano kiełkowanie i wigor nasion niekondycjonowanych i kondycjonowanych. Na ogól hydro-kondycjonowanie negatywnie wpływało na szybkość kiełkowania, procent kiełkujących nasion oraz zdolność kiełkowania. Kondycjonowanie w roztworze KNO3 przyśpieszyło kiełkowanie nasion w temperaturze 20, 30 i 35°C, ale nie miało wpływu na procent nasion kiełkujących i zdolność kiełkowania. Osmokondycjonowanie nasion w roztworze PEG o potencjale osmotycznym -1.0 MPa w temperaturze 20°C nie tylko znacząco poprawiaáo wskaźniki wigoru w temperaturze 20, 30 i 35°C, ale również najkorzystniej z zastosowanych metod wpáywaáo na procent nasion kiełkujących w temperaturze 30 i 35°C i istotnie zwiększyło zdolność kiełkowania nasion w temperaturze 20 i 30°C.
Three seed priming techniques: hydropriming, halopriming and osmopriming, were compared for their effects on germination and vigour of pansy (Viola × wittrockiana Gams.) seeds at 20°C, 30°C and 35°C. Seeds were hydroprimed in the restricted volumes of water (600 and 700 μl H2O·g seed-1, 2, 3 or 4 days), haloprimed in KNO3 solution (-1.5 MPa, 5 days), and osmoprimed in polyethylene glycol solutions (-1.0, -1.25 or -1.5 MPa PEG 8000, 7 days) at 15°C or 20°C. Seed germination and vigour tests were performed for untreated and primed seeds. Generally, hydropriming negatively affected the speed of germination, the percentage of germinating seeds and germination capacity. Halopriming accelerated seed germination at 20°C, 30°C and 35°C but did not influence the percentage of germinating seeds and germination capacity. Osmopriming of seeds in PEG solution of osmotic potential –1.0 MPa at 20°C not only improved germination rates at 20°C, 30°C, and 35°C to the highest extent, but also increased percentage of germinating seeds at 30°C and 35°C most effectively and positively affected seed germination capacity at 20°C and 30°C.
Źródło:: Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 6; 15-29
1644-0692
Pojawia się w:: Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Introduction and overview of China’s pilot training regime
Autorzy:: Li, W.
Yu, J.
Desrosiers, R.
Powiązania:: https://bibliotekanauki.pl/articles/116159.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: Maritime Education and Training (MET)
Opis:: When operating in confined waters such as ports, channels and canals, the ship’s master may not be familiar with the specific and up-to-date navigating conditions such as wind, current and tide. In this case, the master must rely on the knowledge and experience of local experts, the seaport and river pilots, to ensure the safety of the ship, crew and environment. This paper provides an overview of the initial and periodic training required by pilots directed by the China Maritime Safety Administration in accordance with IMO’s A.960 “Recommendation on Training and Certification and Operational Procedure Maritime Pilot Other Than Deep-Sea Pilot” and China’s pilot training requirements. The paper then goes into details describing how pilot training is implemented in Dalian Maritime University (DMU), taking into account the course setting, class hour arrangement, theory and practical class distribution of different class pilots, as well as examining the equipment requirements, trainer’s qualification, and trainee’s seagoing experiences. Based on the results of the China’s pilot training regime, recommendations will be made not only for improving China’s pilot training program, but also where DMU’s best practices may be implemented at other institutions engaged in pilot professional development.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 4; 543-549
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Study on the Structure and Properties of Viscose/Wool Powder Blended Fibre
Badanie struktury i właściwości włókien wiskozowych modyfikowanych sproszkowanymi włóknami wełnianymi
Autorzy:: Li, W.
Ke, G.
Li, G.
Xu, W.
Powiązania:: https://bibliotekanauki.pl/articles/232061.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:: wool powder
viscose fibre
blended fibre
dyeing
włókna wiskozowe
sproszkowana wełna
metoda mokrego przędzenia
Opis:: Viscose/wool powder blended fibres with 0, 5, 10, 15 and 20% wool powder were produced with the method of wet spinning. SEM, FT-IR spectroscopy, WAXD and TG analysis were used to study the chemical composition and structure of viscose/wool powder blended fibre. The experimental results show that the macromolecule composition, aggregation structure, morphological structure and thermal properties of these viscose/wool powder blended fibres were similar, which mainly show the characteristics of viscose fibre. Absorption studies were carried out to investigate the protein characteristics of the blended fibre. The results showed that the affinity of the blended fibre to acid dye increased with the wool powder content.
Wyprodukowano włókna wiskozowe z dodatkiem sproszkowanej wełny w ilości 0,5, 10, 15 i 20% metodą mokrego przędzenia. Do badań składu chemicznego i struktury zastosowano SEM, FTIR, WAXD i analizę TG. Wyniki wykazały, że skład makromolekularny, struktura agregatowa i morfologiczna oraz właściwości termiczne włókien były podobne, z dominacją właściwości włókien wiskozowych. Przeprowadzono badania absorpcji dla zbadania oddziaływania proteiny w otrzymanych włóknach. Stwierdzono, że powinowactwo mieszanek włókien do kwaśnych barwników zwiększa się ze wzrostem zawartości proszku wełnianego.
Źródło:: Fibres & Textiles in Eastern Europe; 2015, 1 (109); 26-29
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Dostawca treści:: Biblioteka Nauki

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