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Wyświetlanie 1-4 z 4
Tytuł:
Fast and smooth trajectory planning for a class of linear systems based on parameter and constraint reduction
Autorzy:
Liu, Guangyu
Wu, Shangliang
Zhu, Ling
Wang, Jiajun
Lv, Qiang
Powiązania:
https://bibliotekanauki.pl/articles/2055148.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
constraint reduction
parameter reduction
fast calculation
trajectory planning
redukcja ograniczeń
redukcja parametrów
szybka kalkulacja
planowanie trajektorii
Opis:
Fast and smooth trajectory planning is crucial for modern control systems, e.g., missiles, aircraft, robots and AGVs. However, classical spline based trajectory planning tools introduce redundant constraints and parameters, leading to high costs of computation and complicating fast and smooth execution of trajectory planning tasks. A new tool is proposed that employs truncated power functions to annihilate some constraints and reduce the number of parameters in the optimal model. It enables solving a simplified optimal problem in a shorter time while keeping the trajectory sufficiently smooth. With an engineering background, our case studies show that the proposed method has advantages over other solutions. It is promising in regard to the demanding tasks of trajectory planning.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 1; 11--21
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between Peer Victimization and Anxiety of Pupils: Mediating Effect of Psychological Needs
Autorzy:
Mao-Ling, Zhu
Powiązania:
https://bibliotekanauki.pl/articles/781372.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
peer victimization
psychological needs
anxiety
mediating effect
Opis:
The present study aimed to explore the effects of psychological needs on the relationship of peer victimization and anxiety. Methods: A sample of 889 4th, 5th and 6th primary school students in Guangxi Zhuang Autonomous Region were recruited with the measurement of Peer victimization Questionnaire, Psychological needs Scale and Anxiety Scale (SAS). Results showed that: (1) There were no significant gender and grade differences with respect to Peer victimization; (2) Significant negative correlations were found between all types of peer victimization and the subscales of psychological needs. In addition, significant positive correlations were found between all types of peer victimizationand, anxiety and significant negative correlations between all the subscales of psychological needs and anxiety; (3) Psychological needs partially mediated the relationship between Peer victimizationexperience and anxiety.
Źródło:
Ethics in Progress; 2018, 9, 2; 75-86
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Magnetic Exchange Interaction in Fe₂NiAs Compound
Autorzy:
Wei, Xiao-Ping
Zhang, Ya-Ling
Sun, Xiao-Wei
Song, Ting
Zhu, Xing-Feng
Powiązania:
https://bibliotekanauki.pl/articles/1033418.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.20.Gj
71.20.-b
77.80.B-
Opis:
Using the spin-polarized relativistic Korringa-Kohn-Rostoker method, we study the electronic and magnetic properties of Fe₂NiAs compound with the Hg₂CuTi structure. Electronic calculations reveal the d-d orbital hybridization taking an important role in the compound. The calculated magnetic moments, which contain the spin and orbital moments, are primarily carried by Fe atoms located in A and B sites. The orbital moment of Fe₂NiAs system is rather small due to the cause of orbital quenching, implying a weak spin-orbit coupling. Simultaneously, we also study the influence of lattice constant on the magnetic moment, it is found that both spin and orbital moments are sensitive to the changes of lattice constants, i.e., the moments become larger as the expansion of lattice constant, indicating the enhancement of spin-orbit coupling effect. In addition, we investigate the magnetic interactions between the constituents to obtain the Heisenberg exchange coupling parameters. It is noted that the interactions are dominated by a strong exchange between Fe atoms. Finally, we acquire the Curie temperatures of Fe₂NiAs compound under different lattice constants by using mean field approximation.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1320-1324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization the operation parameters of SDA desulfurization tower by flow coupling chemical reaction model
Autorzy:
Mei, Dan
Shi, Junjie
Zhu, Yuzheng
Xu, Xuemei
Xing, Futang
Shi, Ling
Powiązania:
https://bibliotekanauki.pl/articles/778336.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
spray drying absorber tower
gas-liquid two-phase flow
droplet diameter
desulfurization efficiency
amount of scaling
Opis:
Spray Drying Absorber (SDA) has been widely used for large-scale desulfurization. However, it also has some limitations. For example, the liquid absorbent easily causes scaling, which impedes the contact between the serous fluid and the flue gas and reduces the chemical reaction rate and desulfurization efficiency. This paper establishes the mathematical and physical model of gas and liquid two-phase flow and droplet evaporation and heat transfer in rotary spray desulfurization tower. To study the accumulation and distribution of chemical reaction precipitates in the desulfurization tower and analyze the removal efficiency of sulfur dioxide (SO2) in different atomization diameters, this paper establishes a simulation model concerning the coupling of desulfurization reaction and flow field calculation based on the absorption and reaction mechanism of SO2. Baffle in different widths are set to optimize the internal floweld and balance the distribution of flue gas. By setting baffles of different widths to optimize the flow feld in the tower and changing the distribution of flue gas, this model reduces the scaling while ensuring the desulfurization efficiency. The results of the simulation experiment have verified that the droplet with a diameter of 50 μm is the optimal option, which can effectively remove the scaling and ensure that the desulfurizing tower runs in high efficiency and stability. When the width of baffes is 2250 mm, the efficiency of desulfurization exceeds 95%, and the amount of scaling on the desulfurization tower main wall is controlled at the minimum level, which is the optimal option for production.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 1; 35-45
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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