作者机构:
[Deng, Yi; Zhu, Jiying; Liu, Hai] Wuhan Text Univ, Sch Elect & Elect Engn, Wuhan 430200, Peoples R China.;[Deng, Yi] Wuhan Text Univ, State Key Lab New Text Mat & Adv Proc Technol, Wuhan 430200, Peoples R China.;[Liu, Hai] Cent China Normal Univ, Fac Artificial Intelligence Educ, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构:
[Liu, H ] W;Wuhan Text Univ, Sch Elect & Elect Engn, Wuhan 430200, Peoples R China.;Cent China Normal Univ, Fac Artificial Intelligence Educ, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词:
dual-motor coupling;IPM;ADRC;permanent magnet synchronous motor (PMSM)
摘要:
Dual-motor control systems require high synchronization maintenance. Active disturbance rejection controllers (ADRC), renowned for their exceptional immunity to interference, rapid response time, and robustness, have gained widespread adoption as a prominent control strategy. The stability of the dual-motor system can be enhanced by employing an ADRC. However, setting ADRC parameters is challenging. This paper proposes an improved particle swarm optimization method (IPM) to alleviate the difficulty in parameter setting. We initially developed a simplified dual-motor ADRC model that includes current loop and speed loop ADRCs. Furthermore, aiming at maintaining synchronization of the dual-motor control system, the simplified dual-motor ADRC model and IPM method are combined. The experimental results demonstrate that in comparison with state-of-the-art methods, the proposed optimized dual-motor ADRC exhibits superior robustness, minimal overshoots, negligible steady-state errors, and high stability.
摘要:
Cropland displacement, as an important characteristic of cropland change, places more emphasis on changes in spatial location than on quantity. The effects of cropland displacement on global and regional food production are of general concern in the context of urban expansion. Few studies have explored scale-effects, however, where cropland is displaced not only within, but also outside, the administrative boundary of a certain region. This study used a spatially explicit model (LANDSCAPE) to simulate the potential cropland displacement caused by urban land expansion from 2020 to 2040 at four scales of the Chinese administration system (national, provincial, municipal, and county levels). The corresponding changes in potential cereal production were then assessed by combining cereal productivity data. The results show that 4700 km(2) of cropland will be occupied by urban expansion by 2040, and the same amount of cropland will be supplemented by forest, grassland, wetland, and unused land. The potential loss of cropland will result in the loss of 3.838x10(6) tons of cereal production, and the additional cropland will bring 3.546x10(6) tons, 3.831x10(6) tons, 3.836x10(6) tons, and 3.528x10(6) tons of potential cereal production in SN (national scale), SP (provincial scale), SM (municipal scale), and SC (county scale), respectively. Both SN and SC are observed to make a huge difference in cereal productivity between the lost and the supplemented cropland. We suggest that China should focus on the spatial allocation of cropland during large-scale displacement, especially at the national level.
作者:
Ji, Zhengxin;Liu, Chao;Xu, Yueqing;Sun, Minxuan;Wei, Hejie;...
期刊:
地理学报:英文版,2023年33(4):779-800 ISSN:1009-637X
通讯作者:
Xu, YQ
作者机构:
[Xu, YQ; Sun, Minxuan; Xu, Yueqing; Li, Yaoyao; Sun, Qiangqiang; Sun, Danfeng; Ji, Zhengxin; Zhang, Ping] China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China.;[Xu, YQ; Sun, Minxuan; Xu, Yueqing; Li, Yaoyao; Sun, Qiangqiang; Sun, Danfeng; Ji, Zhengxin; Zhang, Ping] Minist Nat Resources, Key Lab Agr Land Qual, Beijing 100193, Peoples R China.;[Liu, Chao] Cent China Normal Univ, Coll Publ Adm, Wuhan 430079, Peoples R China.;[Wei, Hejie] Henan Agr Univ, Coll Resources & Environm Sci, Zhengzhou 450002, Peoples R China.
通讯机构:
[Xu, YQ ] C;China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China.;Minist Nat Resources, Key Lab Agr Land Qual, Beijing 100193, Peoples R China.
关键词:
land use function;value evaluation;production-living-ecological space;spatial and temporal variation;Zhangjiakou
摘要:
Developed here is an integrated framework for identifying production-living-ecological space (PLES) quantitatively at grid scale from the perspective of multifunction land use, and 25 compound space types are classified to highlight the multiple functions of PLES. As a typical mountainous city in northern Hebei province, Zhangjiakou is used as a case study, and the results show that more than 80% of the land space in Zhangjiakou has remarkable triple functionality. The living-dominated space and the production-dominated space are distributed mainly in the valleys of the Yanghe, Sanggan, and Huliu rivers and have obvious spatial consistency, while the ecological-dominated space is concentrated mostly at the eastern Yanshan Mountains and southern Taihang Mountains and complements the other two types of space. The former two are spatially fragmented, while the latter has been expanding to the periphery over time. From 1990 to 2015, the ecological-dominated space has increased the most by 1555.02 km(2), while the living-dominated space has increased the least by 816.79 km(2). The types of PLES are more diverse in the medium and low mountains and the areas with gentle slope, and the influencing factors include natural ecological environment, socioeconomic development, human consumption demand, and institutional policies. Therefore, these findings can mitigate conflicts among PLES in mountainous and similar areas, and promote the balanced development of land space.
通讯机构:
[Li, S ] H;Hubei Univ Educ, Sch Phys & Mech Elect & Engn, Wuhan 430205, Peoples R China.
摘要:
This paper presents research that focuses on nonflow contribution subtraction in heavy-ion collisions, using a multiphase transport model (AMPT). Specifically, the study aims to investigate the behavior of charged particle elliptic flow (
$$v_{\textrm{2}}$$
) in d-Au collisions at a collision energy of
$$\sqrt{s_{\textrm{NN}}} = 200$$
GeV and to determine the impact of nonflow sources, such as jet correlations and resonance decays, in small collision systems. To reduce nonflow effects, the per-trigger yield distribution in peripheral d-Au collisions or pp collisions with the same collision energy is subtracted. Our results show that the nonflow effects in central and mid-central collisions are not strongly dependent on subtracting the per-trigger yield distribution in peripheral d-Au collisions or pp collisions. Furthermore, the elliptic flow of charged particles, after removing nonflow effects through two subtracting methods from this work, exhibits consistency in various collision centrality classes. We also discuss comparisons with measurements from d-Au collisions at
$$\sqrt{s_{\textrm{NN}}} = 200$$
GeV. Overall, this work provides valuable insights and serves as a reference for researchers studying nonflow contribution subtraction in experiments with small collision systems.
作者机构:
[Wei, Shaoyu; Zheng, Ruiling; Shi, Minghui; Zhang, Junsong] Department of Artificial Intelligence, Xiamen University, Fujian, Xiamen;361005, China;[Li, Rui] National Engineering Laboratory for Educational Big Data, Central China Normal University, Hubei, Wuhan;430079, China;[Wei, Shaoyu; Zheng, Ruiling; Shi, Minghui; Zhang, Junsong] 361005, China
通讯机构:
[Acharya, S ] U;Univ Clermont Auvergne, CNRS, IN2P3, LPC, Clermont Ferrand, France.;Homi Bhabha Natl Inst, Ctr Variable Energy Cyclotron, Kolkata, India.
摘要:
The most precise measurements to date of the _{Λ}^{3}H lifetime τ and Λ separation energy B_{Λ} are obtained using the data sample of Pb-Pb collisions at sqrt[s_{NN}]=5.02 TeV collected by ALICE at the LHC. The _{Λ}^{3}H is reconstructed via its charged two-body mesonic decay channel (_{Λ}^{3}H→^{3}He+π^{-} and the charge-conjugate process). The measured values τ=[253±11(stat)±6(syst)] ps and B_{Λ}=[102±63(stat)±67(syst)] keV are compatible with predictions from effective field theories and confirm that the _{Λ}^{3}H structure is consistent with a weakly bound system.