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Wyświetlanie 1-10 z 101
Tytuł:
Flotation performance of a novel collector, ethyl o-mesitylsulfonylacetohydroxamate, for bastnaesite ores
Autorzy:
Di, Yuli
Liu, Xiankui
He, Xia
Zhang, Hao
Huang, Haiyan
Cheng, Wang
Jiao, Yu
Tematy:
bastnaesite ore
flotation
density functional theory
surface adsorption
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/58971442.pdf  Link otwiera się w nowym oknie
Opis:
Existing collectors used in the flotation process of bastnaesite ores are characterized by the poor flotation performance and low recovery. In this paper, from the perspective of molecular structure, ethyl O-mesitylsulfonylacetohydroxamate (C1) was selected as a novel collector for bastnaesite ores, and compared with the most commonly used collector, salicylhydroxamic acid (C2), in the flotation test with bastnaesite ore with fine mineral particles, complex embedding and a high mud content. The flotation test confirmed that C1 had the better collection ability and flotation performance than C2. Then, the adsorption mechanisms between collectors (C1 and C2) and bastnaesite surface were explored based on first principles thinking. The adsorption energies between collectors (C1 and C2) and the (110) plane of bastnaesite were respectively calculated as -1.79 eV and -1.44 eV and corresponding adsorption heights were respectively 1.65 Å and 2.43 Å. These data indicated that C1 had the better affinity to the (110) plane of bastnaesite and the better binding. The calculation results of partial density of states (PDOS) showed that both collectors underwent significant orbital hybridization with the (110) plane of bastnaesite, suggesting strong electronic interactions.
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
Tematy:
fault diagnosis
sensor fault
T-type inverter
three-level inverter
dual
three-phase
PMSM
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/1193713.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic stability of a neutral integro-differential equation
Autorzy:
Wang, G.
Cheng, S. S.
Tematy:
asymptotic behavior
nonlinear neutral integro-differential equation
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255680.pdf  Link otwiera się w nowym oknie
Opis:
The global stability behavior of a non-autonomous neutral functional integro-differential equation is studied. A sufficient condition for every solution of this equation to tend to zero is given.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on a quasi-zero-stiffness vibration isolator under random excitation
Autorzy:
Wang, Y.
Li, S.
Cheng, C.
Tematy:
vibration isolator
quasi-zero-stiffness
random excitation
dynamic analysis
performance analysis
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Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/281608.pdf  Link otwiera się w nowym oknie
Opis:
The dynamic response and isolation performance of a Quasi-Zero-Stiffness (QZS) vibration isolator using inclined springs as negative stiffness correctors under random excitation are presented in this paper. The probabilistic linearization method is employed to determine the dynamic response of the QZS vibration isolator and compared with the exact solution based on the Fokker-Planck-Kolmogorov (FPK) equation and the equivalent linearization method. Two performance indexes (Mean Square Relative Displacement (MSRD) and Mean Square Acceleration (MSA)) are considered to evaluate the isolation performance of the QZS vibration isolator under random excitation and compared with the equivalent linear vibration isolator. The results show that the MSRD of the QZS vibration isolator is always lower than the equivalent linear vibration isolator, while the MSA of the QZS vibration isolator can be larger or lower than the equivalent linear vibration isolator based on the values of damping ratio and spectral density of the random excitation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single target tracking algorithm for lightweight Siamese networks based on global attention
Autorzy:
Wang, Zhentao
He, Xiaowei
Cheng, Rao
Tematy:
target tracking
Siamese network
semantic information
training strategy
feature fusion
deep learning
śledzenie celu
sieć syjamska
informacja semantyczna
strategia szkolenia
fuzja funkcji
głęboka nauka
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2173664.pdf  Link otwiera się w nowym oknie
Opis:
Object tracking based on Siamese networks has achieved great success in recent years, but increasingly advanced trackers are also becoming cumbersome, which will severely limit deployment on resource-constrained devices. To solve the above problems, we designed a network with the same or higher tracking performance as other lightweight models based on the SiamFC lightweight tracking model. At the same time, for the problems that the SiamFC tracking network is poor in processing similar semantic information, deformation, illumination change, and scale change, we propose a global attention module and different scale training and testing strategies to solve them. To verify the effectiveness of the proposed algorithm, this paper has done comparative experiments on the ILSVRC, OTB100, VOT2018 datasets. The experimental results show that the method proposed in this paper can significantly improve the performance of the benchmark algorithm.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction and simulation of a decision model for anti-slip restoration technology of asphalt pavement surface based on vehicle dynamics
Autorzy:
Cheng, Rui
Li, Xinkai
Wang, Lichao
Tematy:
teoria Perssona
teoria tarcia
dynamika pojazdu
droga
antypoślizgowość
nawierzchnia asfaltowa
model decyzyjny
Persson theory
friction theory
vehicle dynamics
road
antiskid
asphalt pavement
decision model
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Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/59111052.pdf  Link otwiera się w nowym oknie
Opis:
Taking real-time and effective preventive maintenance measures on in-service roads can reduce traffic congestion, eliminate potential road safety hazards, and greatly reduce road maintenance costs. Therefore, based on the Persson friction theory, this study first determines the evaluation indicators for the anti slip ability of asphalt pavement. And based on vehicle dynamics and contact friction between tires and road surface, the anti-skid thresholds of road surfaces for different road conditions and vehicle models are solved through simulation. This study utilizes Python and neural network algorithms to establish a decision-making model for anti-slip recovery technology of asphalt pavement. The experiment shows that the model trained by Back Propagation neural network has high accuracy. The training accuracy of the model is stable at around 0.90, and the training loss value is around 0.34, which can be used for decision-making in anti slip recovery technology. When the speed is less than 60 km/h, the increase in the threshold of dynamic friction coefficient is significant. The maximum difference in growth rate is 47.9%. When the speed exceeds 60 km/h, the increase in the threshold of dynamic friction coefficient gradually slows down. Therefore, at lower speeds, it is more essential to consider the variable value of the dynamic friction coefficient. When the speed is high, more consideration needs to be given to its reference value. This study provides a scientific basis for ensuring that the anti slip ability of the road surface always meets the requirements of driving safety, and has important engineering practical value, economic and social benefits.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bifurcation in a nonlinear steady state system
Autorzy:
Wang, G. Q.
Cheng, S. S.
Tematy:
bifurcation
cellular neural network
steady state
Krasnoselsky fixed point theorem
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255541.pdf  Link otwiera się w nowym oknie
Opis:
The steady state solutions of a nonlinear digital cellular neural network with ω neural units and a nonnegative variable parameter λ are sought. We show that λ = 1 is a critical value such that the qualitative behavior of our network changes. More specifically, when ω is odd, then for λ ∈ [0, 1), there is one positive and one negative steady state, and for λ ∈ [1, ∞), steady states cannot exist; while when ω is even, then for λ ∈ [0, 1), there is one positive and one negative steady state, and for λ = 1, there are no nontrivial steady states, and for λ ∈ (1, ∞), there are two fully oscillatory steady states. Furthermore, the number of existing nontrivial solutions cannot be improved. It is hoped that our results are of interest to digital neural network designers.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An SFA-HMM performance evaluation method using state difference optimization for running gear systems in high-speed trains
Autorzy:
Cheng, Chao
Wang, Meng
Wang, Jiuhe
Shao, Junjie
Chen, Hongtian
Tematy:
slow feature analysis
SFA
performance evaluation
hidden Markov model
HMM
running gear system
analiza cech
ocena efektywności
ukryty model Markowa
układ biegowy
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:
https://bibliotekanauki.pl/articles/2172116.pdf  Link otwiera się w nowym oknie
Opis:
The evaluation of system performance plays an increasingly important role in the reliability analysis of cyber-physical systems. Factors of external instability affect the evaluation results in complex systems. Taking the running gear in high-speed trains as an example, its complex operating environment is the most critical factor affecting the performance evaluation design. In order to optimize the evaluation while improving accuracy, this paper develops a performance evaluation method based on slow feature analysis and a hidden Markov model (SFA-HMM). The utilization of SFA can screen out the slowest features as HMM inputs, based on which a new HMM is established for performance evaluation of running gear systems. In addition to directly classical performance evaluation for running gear systems of high-speed trains, the slow feature statistic is proposed to detect the difference in the system state through test data, and then eliminate the error evaluation of the HMM in the stable state. In addition, indicator planning and status classification of the data are performed through historical information and expert knowledge. Finally, a case study of the running gear system in high-speed trains is discussed. After comparison, the result shows that the proposed method can enhance evaluation performance.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of patent innovation evolution and layout characteristics of global new textile materials technologies
Autorzy:
Wang, Pengfei
Cheng, Hua
Elvis, Nguepi Tsafack
Tematy:
textile
new material
patent innovation
layout structure
technology evolution
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Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:
https://bibliotekanauki.pl/articles/59115111.pdf  Link otwiera się w nowym oknie
Opis:
Vigorously developing new textile material technology is critical to improving the textile industry’s high-tech level , upgrading its transformation , promoting high-quality development of the real economy, and enhancing the country’s overall power. This paper analyzes patent technology to explore new textile material technology layout characteristics and evolution trends for the strategic basis of industrial transformation and development on a global scale. The research took new textile material technology patents as the research object, constructed 76,373 invention application patent data pools in China, Europe, Japan, South Korea, and the United States, and analysed new textile material technology structural characteristics and their evolution trend from three aspects of patent structure, layout characteristics and evolutions. As a result, it was found that the development plans and target focuses of textile new material technology vary from country to country. Global enterprises in garments, advanced material production, and chemical materials, represented by DuPont, 3M, and Dow Global Technologies, provide an important guarantee for the United States in maintaining its global leadership position in the development of the new textile material industry. Japan pays more attention to the practicality of new materials and considers the coordinated development of the environment and resources. Europe and South Korea focus on the construction of industrial clusters with their own characteristics, establish and improve the industrial standardization system based on core technology and core manufacturing, and maintain global competitiveness in textile new material technology. After 2009, the number of patent applications for new textile material technology in China exceeded that of Europe, the United States, Japan, and South Korea, becoming a global patent power. However, there is still a huge gap between the quality of patents and the layout of new cutting-edge materials in China and those in developed countries such as the United States and Japan, which is the main problem that needs to be solved urgently in the future innovation and development of China’s textile industry, technology planning and layout.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 101

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