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Tytuł:
Raman Spectroscopy Studies of Carbon-Based Cathode Materials during Aluminum Electrolysis
Autorzy:
Wang, Wei
Chen, Weijie
Powiązania:
https://bibliotekanauki.pl/articles/352779.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium electrolysis
carbon cathodes
Raman spectroscopy
creep deformation
sodium expansion
Opis:
The sodium expansion and creep strain of semi-graphitic cathodes are investigated using a modified Rapoport apparatus. To further understanding of the sodium and bath penetration damage processes, the impact of external stress fluence on the carbon cathode microstructure has been defined with XRD analysis, Raman spectroscopy and scanning electron microscope (SEM). Graphite atoms fracture into smaller fragments that are less directional than the pristine platelets, which allows for a possible filling of the cracks that thus develop by the sodium and bath during aluminum electrolysis. The average microcrystalline size (calculated by Raman spectroscopy) is reduced by the deformation. The decreased intensity and widened 'G' and 'D' peaks in the analysis indicate the poor order of the sheets along the stacking direction while the consistent layered graphite structure is sustained.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1257-1261
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A calibration-based method for interval reliability analysis of the multi-manipulator system
Autorzy:
Wang, Wei
Liu, Shuangyao
Wang, Jin
Lu, Guodong
Powiązania:
https://bibliotekanauki.pl/articles/2057981.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
multiple manipulators
series-parallel systems
reliability estimation
base frame
Opis:
The multiple manipulators can construct a special multi-agent system with the distinction that the type can be serial or parallel according to their cooperative way. We proposed a comprehensive method to handle the problem of reliability estimation. The wide and narrow bound method are applied to calculate the interval reliability respectively when multiple manipulators work as the series system. Aims to decrease the system complexity and enhance the dynamic adjustment capability, the base frame calibration technique is presented to convert the series system to a parallel one, naturally the reliability can be improved significantly. A system composed by three manipulators is utilized as an example to illustrate the feasibility of the proposed method.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 1; 42--52
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General self-efficacy and the effect of hospital workplace violence on doctors’ stress and job satisfaction in China
Autorzy:
Yao, Yongcheng
Wang, Wei
Wang, Faxuan
Yao, Wu
Powiązania:
https://bibliotekanauki.pl/articles/2178847.pdf
Data publikacji:
2014-06-21
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
job satisfaction
stress
workplace violence
general self-efficacy
job initiative
Opis:
Objectives: This study aims at exploring associations of general self-efficacy (GSE), workplace violence and doctors' work-related attitudes. Material and Methods: In this study a cross-sectional survey design was applied. Questionnaires were administrated to 758 doctors working in 9 hospitals of Zhengzhou, Henan province, China, between June and October 2010. General information on age, gender, and years of working was collected, and the doctors' experience and witnessing workplace violence, job satisfaction, job initiative, occupational stress as well as GSE were measured. General linear regression analysis was performed in association analyses. Results: Both experiencing and witnessing workplace violence were significantly positively correlated with the level of occupational stress but significantly negatively correlated with job satisfaction, job initiative, and GSE. General self-efficacy significantly modified relationships between both experiencing and witnessing workplace violence with occupational stress (β = 0.49 for experiencing violence; β = 0.43 for witnessing violence; p < 0.001) and with job satisfaction (β = -0.35 and -0.34, respectively; p < 0.05). However, it did not modify the relationships between both experiencing and witnessing workplace violence with job initiative (p > 0.05). The levels of occupational stress declined significantly with the increase of GSE, while job satisfaction increased significantly along with its increase. The effects of GSE on occupational stress and job satisfaction weakened as the frequency of violence increased. Conclusions: The findings suggest that GSE can modify effects of workplace violence on health care workers' stress and job satisfaction. Enhancing GSE in combination with stress reduction may lead to facilitating health care workers' recovery from workplace violence, and thereby improving their work-related attitudes.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2014, 27, 3; 389-399
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault Diagnosis of Sensors for T-type Three-Level Inverter-fed Dual Three-Phase Permanent Magnet Synchronous Motor Drives
Autorzy:
Wang, Xueqing
Wang, Zheng
Wang, Wei
Cheng, Ming
Powiązania:
https://bibliotekanauki.pl/articles/1193713.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fault diagnosis
sensor fault
T-type inverter
three-level inverter
dual
three-phase
PMSM
Opis:
To improve the reliability of motor system, this paper investigates the sensor fault diagnosis methods for T-type inverter-fed dual three-phase permanent magnet synchronous motor (PMSM) drives. Generally, a T-type three-level inverter-fed dual three-phase motor drive utilizes four phase-current sensors, two direct current (DC)-link voltage sensors and one speed sensor. A series of diagnostic methods have been comprehensively proposed for the three types of sensor faults. Both the sudden error change and gradual error change of sensor faults are considered. Firstly, the diagnosis of speed sensor fault was achieved by monitoring the error between the rotating speed of stator flux and the value from speed sensor. Secondly, the large high-frequency voltage ripple of voltage difference between the estimated voltage and the reference voltage was used to identify the voltage sensor faults, and the faulty voltage sensor was determined according to the deviation of voltage difference. Thirdly, the abnormal current amplitude on harmonic subspace was adopted to identify the current sensor faults, and the faulty current sensor was located by distinguishing the current trajectory on harmonic subspace. The experiments have been taken on a laboratory prototype to verify the effectiveness of the proposed fault diagnosis schemes.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 165-176
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A content analysis of missions statements of Taiwaneses Community Colleges
Analiza treści misji kolegiów środowiskowych na Tajwanie
Autorzy:
Wang, Wei-ni
Hsieh, Ong-Fen
Chan, Hwei-Jen
Powiązania:
https://bibliotekanauki.pl/articles/417690.pdf
Data publikacji:
2008
Wydawca:
Akademickie Towarzystwo Andragogiczne
Tematy:
COMMUNITY COLLEGES (TAIWAN)
MISSION STATEMENT
Opis:
Mission statements present an easily and publicly available communication message regarding the stated purpose of organizations. This study examined 70 mission statements of the Taiwanese community colleges. Through the rationale of content analysis methodology, the researchers found 21 mission characteristics emerged from the data. The researchers also analysed the extent to which the characteristics of missions changed over the years, and found 2001-2004 was the key period of time when community colleges started to show greater attention to particular issues and populations. The study further investigated the extent to which mission statements were similar and the extent to which they were different, given the references to urbanity and modes of management.
Źródło:
Rocznik Andragogiczny; 2008, R. 2008; 189-206
1429-186X
2391-7571
Pojawia się w:
Rocznik Andragogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Age Structures and Air Pollution: What Role Does Gender Play?
Struktura wiekowa i zanieczyszczenie powietrza: jaką role odgrywa płeć?
Autorzy:
Liu, Jiliang
Wang, Wei
Chen, Yin E
Chang, Chun-Ping
Powiązania:
https://bibliotekanauki.pl/articles/371266.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
age structure
gender
carbon emission
panel cointegration
panel causality
struktura wiekowa
płeć
emisja ditlenku węgla
kointegracja paneli
przyczynowość panelu
Opis:
We investigate the influence of age structure and gender on air pollution, dividing the age structure into four groups and use CO2 emissions as a measure of air pollution, which can be separated into four categories to ob-tain more complete findings, then employing panel cointegration techniques and panel-based error correction models. The data are collected from 29 OECD and 40 non-OECD countries in the period 1990-2014. For case of total CO2 emissions, younger (people under 30) and older people (people 65 and above) emit less than people in the intermediate age group, but the impact of age group on CO2 emissions is different when looking at CO2 emissions from coal, gas, and oil. While we take gender into account, the causality between age structure and CO2 emissions becomes significant, especially for the relationship between population and total CO2 emissions in OECD and non-OECD countries. We also note that more people who are aged 15-29 increase total CO2 emis-sions in OECD countries and more people who are aged 30-44 decrease CO2 emissions from coal in non-OECD countries. Our findings suggest that an energy and environmental policy should consider both age structure and gender effects on environmental issues.
Artykuł przedstawia wyniki badań odnoszących się do wpływu zmiennych struktury wiekowej i płci na zanie-czyszczenia powietrza, wyróżniając cztery grupy wiekowe i wykorzystując poziom emisji CO2 jako wskaźnik zanieczyszczeń powietrza, który można podzielić na 4 kategorie, a następnie wykorzystaliśmy techniki kointe-gracji paneli i oparte na panelach modele korekcji błędów. Dane zebrano z 29 krajów należących do OECD i 40 spoza tej organizacji, obejmują one lata 1990-2014. W przypadku całkowitej emisji CO2 okazało się, że osoby młodsze (poniżej 30 roku życia) oraz starsze (powyżej 65 roku życia) odpowiedzialne są za mniejszą emisję niż osoby w wieku średnim, przy czym występują różnice odnoszące się do poszczególnych grup wiekowych w odniesieniu do emisji CO2 z różnych źródeł: węgla, gazu i ropy. Biorąc pod uwagę płeć, zależność pomiędzy strukturą wiekową a emisjami CO2 okazuje się być znaczącą, szczególnie w aspekcie relacji pomiędzy populacją a całkowitą emisją CO2. Zauważyliśmy ponadto, że osoby w wieku 15-29 z krajów OECD bardziej przyczyniają się do wzrostu całkowitej emisji CO2, a w przypadku krajów nie należących do OECD osoby w wieku 30-44 bardziej odpowiedzialne są za obniżenie emisji CO2 z węgla. Przeprowadzone badania umożliwiają postawienie hipotezy, według której polityka energetyczna i środowiskowa w kontekście zagadnień odnoszących się do środowiska powinna uwzględniać zarówno strukturę wieku jak i płci.
Źródło:
Problemy Ekorozwoju; 2019, 14, 1; 43-52
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sodium Penetration on Microscopic Deformation of Carbon-Based Cathode Materials During Aluminum Electrolysis
Autorzy:
Liu, Hitao
Huang, Yunhong
Wang, Wei
Zhang, Ziyang
Dang, Hengyao
Powiązania:
https://bibliotekanauki.pl/articles/2106608.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbon cathode
microstructure
sodium penetration
dislocation
kink band
Opis:
In this paper, the macroscopic and microscopic deformation caused by sodium penetration in the carbon cathode has been studied during aluminum electrolysis. The distributions of sodium concentration in the carbon cathode has been measured by SEM-EDS. The microstructure change caused by the gradient of the sodium concentration in the carbon cathode has been studied using transmission electron microscopy (TEM). The results indicate that sodium penetration decreases with the increase of the penetration depth. The stresses caused by the gradient of the sodium concentration result in a remarkable change for the microstructure of the carbon cathode. The formation of dislocations resulting in dislocation arrays and the development of kink band networks bring about material damage growth and possibly subsequent weakening of the cathode. These results can provide useful information that is helpful in developing an improved comprehending of the microscopic deformation mechanism of the carbon cathode during aluminum electrolysis.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 779--785
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A moment-matching based method for the analysis of manipulator’s repeatability of positioning with arbitrarily distributed joint clearances
Oparta na dopasowywaniu momentów metoda analizy powtarzalności pozycjonowania manipulatora o dowolnym rozkładzie luzów na przegubach
Autorzy:
Wang, Wei
Wang, Jin
Fu, Jian-Hui
Lu, Guo-Dong
Powiązania:
https://bibliotekanauki.pl/articles/301397.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
manipulator
positioning repeatability
arbitrarily distributed clearance
moment-matching
Lagrange multipliers method
powtarzalność pozycjonowania
arbitralnie rozłożone luzy
dopasowanie momentów
metoda mnożników Lagrange'a
Opis:
The joint clearance can be the mainly concern factor in the analysis of repeatability of positioning for a manipulator. Traditionally, the joint clearance is empirically assumed to be uniform or normal variables. This hasty treatment may be not accurate enough when the precise statistic information of variables cannot be obtained. To handle the reliability evaluation problem with arbitrarily distributed joint clearances, a moment-matching based method is proposed. The highly nonlinear performance function is firstly established by the forward kinematics and then a second order Taylor expansion is performed on this function for the order reduction. Based on the maximum entropy principle, the Lagrange multipliers method is employed to derive a best-fit probability density function (PDF) with consideration of the first four moments-matching restrictions. This study shows that the prosed method can acquire a better accuracy and efficiency compared with the first order second moment method (FOSM), first order reliability method (FORM) and Monte Carlo simulation (MCS). A serial manipulator is applied as an example to demonstrate the new method.
Luzy na przegubie manipulatora mogą stanowić główny czynnik wpływający na analizę powtarzalności pozycjonowania manipulatora. Tradycyjnie przyjmuje się empirycznie podbudowane założenie, że luz na przegubie jest zmienną jednorodną lub normalną. Takie ujęcie może jednak nie być wystarczająco dokładne w przypadku, gdy nie można uzyskać precyzyjnych informacji statystycznych na temat zmiennych. Aby rozwiązać problem oceny niezawodności przy dowolnie rozłożonych luzach na przegubie, zaproponowano metodę opartą na dopasowywaniu momentów. W pierwszej kolejności, obliczono za pomocą kinematyki prostej, wysoce nieliniową funkcję stanu granicznego, a następnie wyznaczono szereg Taylora drugiego rzędu dla tej funkcji w celu obniżenia rzędu. Opierając się na zasadzie maksymalnej entropii, zastosowano metodę mnożników Lagrange'a w celu wyprowadzenia najlepiej dopasowanej funkcji gęstości prawdopodobieństwa (PDF) z uwzględnieniem pierwszych czterech ograniczeń dopasowania momentów. Badanie to pokazuje, że przedstawiona metoda pozwala uzyskać wyższą trafność i skuteczność niż metoda pierwszego rzędu drugiego momentu (FOSM), metoda analizy niezawodności pierwszego rzędu (FORM) czy symulacja Monte Carlo (MCS). Zastosowanie nowej metody zilustrowano na przykładzie manipulatora szeregowego.
Źródło:
Eksploatacja i Niezawodność; 2019, 21, 1; 10-20
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shrink-Proof Treatment Parameter Optimisation of Cashmere Yarn
Autorzy:
Li, Long
Wang, Wei
Zhang, Xian
Wu, Lei
Yang, Dan
Powiązania:
https://bibliotekanauki.pl/articles/2171991.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cashmere yarn
shrink-proof
potassium permanganate treatment
yarn shrinkage percentage
Opis:
Cashmere fiber has soft hand and good elasticity. However, it exhibits shrink because of its scale. In this work, cashmere yarn (38.26 tex) was treated using NaCl-KMnO4 to reduce the shrink of cashmere yarn. Orthogonal design and fuzzy comprehensive evaluation were used for optimizing treating parameters. Experimental results showed that the yarn shrink percentage of treated yarn was 0.56% which was less than that untreated yarn, and the treated yarn strength had a little drop compared with untreated yarn. The fiber scale outline of treated yarn could be observed by SEM, but the scale edge is blunt and irregular.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 3 (151); 57--60
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of pollution accumulation on coating aging of UHV line insulators with different suspension height in coal-ash polluted area
Autorzy:
Lan, Lei
Mu, Lin
Wang, Yu
Yuan, Xiaoqing
Wang, Wei
Li, Zhenghui
Powiązania:
https://bibliotekanauki.pl/articles/140717.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aging
pollution component
pollution degree
RTV coating
Opis:
Room temperature vulcanized (RTV) silicone rubber is widely used to prevent pollution flashover with its excellent hydrophobicity and hydrophobicity transfer. However, RTV coatings are at the risk of deterioration and failure in heavily polluted operating environment. In this paper, RTV coated insulators with different suspension heights operating in coal ash polluted areas were sampled. Pollution degree, pollution composition and aging degree of coatings were tested. The result shows that the insoluble pollution contains Al(OH)3 filler precipitated from RTV coating, which indicates the aging of the RTV coating. The top surface coating is more affected by ultraviolet and rainwater than the bottom surface resulting in more serious degradation. As the pollution degree of the lower phase insulator is heavier than that of the upper phase insulator, the erosion effect of pollution on the RTV coating is more intense. The fillers and rubber molecules of RTV continuously precipitate into the pollution layer, leading to further aging. Therefore, the overall aging degree of the lower insulator coating is more serious than that of the upper insulator coating.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 39-56
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IoT sensing networks for gait velocity measurement
Autorzy:
Chou, Jyun-Jhe
Shih, Chi-Sheng
Wang, Wei-Dean
Huang, Kuo-Chin
Powiązania:
https://bibliotekanauki.pl/articles/330707.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
internet of things
IoT middleware
data fusion
data reduction
internet rzeczy
oprogramowanie pośredniczące
fuzja danych
redukcja danych
Opis:
Gait velocity has been considered the sixth vital sign. It can be used not only to estimate the survival rate of the elderly, but also to predict the tendency of falling. Unfortunately, gait velocity is usually measured on a specially designed walk path, which has to be done at clinics or health institutes. Wearable tracking services using an accelerometer or an inertial measurement unit can measure the velocity for a certain time interval, but not all the time, due to the lack of a sustainable energy source. To tackle the shortcomings of wearable sensors, this work develops a framework to measure gait velocity using distributed tracking services deployed indoors. Two major challenges are tackled in this paper. The first is to minimize the sensing errors caused by thermal noise and overlapping sensing regions. The second is to minimize the data volume to be stored or transmitted. Given numerous errors caused by remote sensing, the framework takes into account the temporal and spatial relationship among tracking services to calibrate the services systematically. Consequently, gait velocity can be measured without wearable sensors and with higher accuracy. The developed method is built on top of WuKong, which is an intelligent IoT middleware, to enable location and temporal-aware data collection. In this work, we present an iterative method to reduce the data volume collected by thermal sensors. The evaluation results show that the file size is up to 25% of that of the JPEG format when the RMSE is limited to 0.5º.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 2; 245-259
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Particle Flow Code modeling of the mechanical behavior of layered rock under uniaxial compression
Modelowanie właściwości mechanicznych skał warstwowych w warunkach ściskania jednoosiowego przy zastosowaniu oprogramowania Particle Flow Code(PFC)
Autorzy:
Yao, Nan
Ye, Yi-Cheng
Hu, Bin
Wang, Wei-Qi
Wang, Qi-Hu
Powiązania:
https://bibliotekanauki.pl/articles/218969.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
skała warstwowa
wytrzymałość na ściskanie jednoosiowe
Particle Flow Code (PFC)
kąt uwarstwienia
mikropęknięcia
layered rock
uniaxial compression test
bedding angle
microcracks
Opis:
In this paper, the different mechanical behaviors of layered rocks with different bedding angles during uniaxial compression tests are studied. Numerical simulation models of layered rock are validated based on laboratory tests, and uniaxial compression tests are conducted by using Particle Flow Code (PFC). Using these simulations, the uniaxial compressive strength, failure patterns, development of micro-cracks, and displacement of meso particles are analyzed. When the bedding angle is similar to the failure angle, the macro failure planes develop directly along the beddings, the bedding behavior dictates the behavior of the layered rock, reducing the compressive strength.
W pracy badano właściwości mechaniczne skał warstwowych zalegających pod różnym kątem uwarstwienia w warunkach ściskania jednoosiowego. Walidację modeli symulacyjnych skał warstwowych przeprowadzono w oparciu o wyniki badań laboratoryjnych, zaś testy ściskania jednoosiowego prowadzono z użyciem pakietu Particle Flow Code (PFC). W oparciu o badania symulacyjne, analizowano wytrzy-małość skał na ściskanie jednoosiowe, modele pękania, powstawanie mikropęknięć i przemieszczenia mezo- cząstek. W przypadku gdy kąt płaszczyzny uwarstwienia ma wartość przybliżoną do kąta pęknięcia, płaszczyzny pękania w skali makro pojawiają się wzdłuż spękań, a układ warstw skalnych determinuje ich wytrzymałość na ściskanie, powodując jej obniżenie.
Źródło:
Archives of Mining Sciences; 2019, 64, 1; 181-196
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the influence of chamfer perforation on heave and pitch of a single floating platform
Autorzy:
Wang, Wei
Fan, Sheming
You, Yunxiang
Zhao, Cheng
Xu, Liqun
Wang, Guibiao
Lu, Zhiqiang
Powiązania:
https://bibliotekanauki.pl/articles/32915201.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
single floating wind power platform
different chamfered perforation
numerical simulation
experiment
heave plate
Opis:
The aim of this work is to study the influence of chamfered perforation and chamfering on the heave and pitch motion of a single floating wind power platform with an anti-heave device. Firstly, the hydrodynamic performance of a single floating body with different chamfers, or without perforation, is calculated and analysed. Secondly, the motion of a model without perforation and with 35° chamfered perforation is captured and studied in a towing tank. The results show that when the wave height is large and the period is small, the perforated device has a certain effect. When the wave height and period are small, the pitch suppression effect of chamfered perforation is more obvious than that of non-chamfered perforation. When the period and wave height are large, the heave suppression effect of non-chamfered perforation is better than that of chamfered perforation. In experimental research, the perforated floating body has a certain effect on restraining the heave and pitch of a floating body under most working conditions, and the effect of restraining the pitch is obviously better than that of restraining the heave.
Źródło:
Polish Maritime Research; 2023, 1; 43-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test
Autorzy:
Liu, Zhong-Zhong
Wang, Han-Peng
Yuan, Liang
Wang, Wei
Zhang, Chong
Xue, Yang
Powiązania:
https://bibliotekanauki.pl/articles/1848966.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stress measurement system
sealing technology
hyperbaric environment
coal and gas outburst
gas-solid coupling
Opis:
A film stress measurement system applicable for hyperbaric environment was developed to characterize stress evolution in a physical simulation test of a gas-solid coupling geological disaster. It consists of flexible film pressure sensors, a signal conversion module, and a highly-integrated acquisition box which can perform synchronous and rapid acquisition of 1 kHz test data. Meanwhile, we adopted a feasible sealing technology and protection method to improve the survival rate of the sensors and the success rate of the test, which can ensure the accuracy of the test results. The stress measurement system performed well in a large-scale simulation test of coal and gas outburst that reproduced the outburst in the laboratory. The stress evolution of surrounding rock in front of the heading is completely recorded in a successful simulation of the outburst which is consistent with the previous empirical and theoretical analysis. The experiment verifies the feasibility of the stress measurement system as well as the sealing technology, laying a foundation for the physical simulation test of gas-solid coupled geological disasters.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 73-88
0860-8229
Pojawia się w:
Metrology and Measurement Systems
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
Wyświetlanie 1-15 z 80

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