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| 1 | Sliding mode control of chaos in the noise-perturbed permanent magnet synchronous motor with non-smooth air-gap显示文摘Permanent magnet synchronous motor (PMSM) is widely used in mining, and there exists chaotic behav- ior when it runs. In order to dispel its adverse effect on security in mining, the chaotic system of PMSM was analyzed. With noise disturbances, the complex dynamic characteristics of chaos were also analyzed, and proved the objective existence of chaos. As we all know, it is very difficult for conventional PMSM control to meet the design requirements, therefore, in order to ensure the robustness of the system, the chaotic orbits were stabilized to arbitrary chosen fixed points and periodic orbits by means of sliding mode method. Finally MATLAB simulations were presented to confirm the validity of the controller. The results show that the PMSM with the sliding mode control has a good dynamic performance and steady state accuracy. | Ma Caoyuan Wang Longshun Yin Zhe Liu Jianfeng Chen Diyi | 2011 | Mining Science and Technology2011，21，6： | 6 |
| 2 | Selected dark sides of biomass-derived biochars as environmental amendments显示文摘With the rapid increase in the application of biochars as amendments, studies are needed to clarify the possible environmental risks derived from biochars to use safely the biomass resources. This work reported selected dark sides of maize straw-and swine manurederived biochars pyrolyzed at 300 and 500°C. During the pyrolysis processes, total heavy metals in the biochars were enriched greatly accompanying with considerable emission of the heavy metals into atmosphere and the trends became increasingly obvious with pyrolysis temperature. Meanwhile, the biochars showed distinctly decreased available heavy metals compared with raw feedstocks, which could be mainly attributed to the sorption by the inorganics in the biochars. The water-and acid-washing treatments significantly increased the releasing risks of heavy metals from biochars into the environments. Electron paramagnetic resonance analysis indicated that persistent free radicals, emerged strongly in the biochars as a function of the aromatization of biomass feedstocks, were free from the influence of water-, acid-, or organic-washing of the biochars and could remain stable even after aged in soils for 30 days. Dissolved biochars, highly produced during pyrolysis processes, showed distinct properties including lower molecular weight distribution while higher aromaticity compared with soil dissolved organic carbon.The results of this study provide important perspectives on the safe usage of biochars as agricultural/environmental amendments. | Zien Chen Lei Luo Diyi Xiao Jitao Lv Bei Wen Yibing Ma Shuzhen Zhang | 2017 | Journal of Environmental Sciences2017，29，4： | 2 |
| 3 | Analysis and control of a hyperchaotic system with only one nonlinear term 显示文摘 | DIYI CHEN LIN SHI HAITAO CHEN XIAOYI MA | 2012 | Nonlinear Dynamics2012，67，3： | 1 |
| 4 | No - chattering sliding mode control chaos in i-Iindmarsh - Rose neurons with uncertain parameters 显示文摘 | DIYI CHEN WEILI ZHAO XIAOYI MA RUNFAN ZHANG | 2011 | Computers and Mathemat- ics with Aoolications2011，61，： | 1 |
| 5 | Synchronization between integer - order chaotic systems and a class of fractional - order chaotic systems via sliding mode control 显示文摘 | DIYI CHEN RUNFAN ZHANG J C SPROTY XIAOYI MA | 2012 | Chaos2012，22，02： | 1 |
| 6 | Prediction of multivariate chaotic time seriesvia radial basis function neural network 显示文摘 | Chen Diyi Han Wenting | 2013 | Mathematics2013，18，4： | 1 |
| 7 | Elucidating and manipulating pressure-induced water intrusion–extrusion in tunable hydrophobic Co/Zn bimetallic ZIFs:Roles of pore size and hydrogen bond显示文摘Porous heterogeneous lyophobic systems(HLSs)find potential applications in energy restoring,dissipating,and absorbing.However,the development of controllable HLSs still lacks rational structure design of nanoporous materials matching the molecular sizes of adopted liquids.Besides that,thoroughly understanding the underlying transportation mechanism in the confined nano channels is greatly challenging.In this work,a series of Co/Zn bimetallic zeolitic imidazolate frameworks(ZIFs)with tunable structures were synthesized via regulating the Co to Zn ratios and employed to investigate the intrusion–extrusion of liquid water in confined nanopores.Structural characterizations confirm the heterometallic coordination in the Co/Zn-doped frameworks.Water intrusion–extrusion experiments unlock the relationship between the intrusion pressure and the nanopore size and realize the evolution of the HLSs between molecular spring and shock-absorber.In addition,cycling tests indicate the reversible structure change of Co/Zn ZIFs encountering pressure-induced water intrusion.In combination with molecular dynamics simulations,we present that the water multimers intrude into nanopores of ZIFs in chain-like forms along with dissociation of hydrogen bonds(HBs).Water molecules in the pre-intrusion state exhibit reduced HBs in response to the increase of pressure and linear structure with 1.6–3.0 HBs on average.After transition to the post-intrusion situation,the associative configuration of water tends to exhibit the tetrahedral structure.Herein,we highlight the roles of pore size and HB in synergically dominating the pressure-induced intrusion–extrusion of liquid water in hydrophobic nanopores.Furthermore,the present work can also guide the development of functional guest–host systems based on porous architectures. | Diyi Fang Chuanlei Liu Yu Chen Qilong Peng Kongguo Wu Yuxiang Chen Hao Jiang Yuan Wu Benxian Shen Qiumin Wu Di Wu Hui Sun | 2024 | Nano Research2024，17，1： | 0 |
| 8 | Fractional-Order Modeling and Dynamical Analysis of a Francis Hydro-Turbine Governing System with Complex Penstocks显示文摘This paper investigates the stability of the Francis hydro-turbine governing system with complex penstocks in the grid-connected mode. Firstly, a novel fractional-order nonlinear mathematical model of a Francis hydro-turbine governing system with complex penstocks is built from an engineering application perspective. This model is described by state-space equations and is composed of the Francis hydro-turbine model, the fractional-order complex penstocks model, the third-order generator model, and the hydraulic speed governing system model. Based on stability theory for a fractional-order nonlinear system, this study discovers a basic law of the bifurcation points of the above system with a change in the fractional-order a. Secondly, the stable region of the governing system is investigated in detail,and nonlinear dynamical behaviors of the system are identified and studied exhaustively via bifurcation diagrams, time waveforms, phase orbits, Poincare maps, power spectrums and spectrograms. Results of these numerical experiments provide a theoretical reference for further studies of the stability of hydropower stations. | Feifei Wang Diyi Chen Beibei Xu Hao Zhang | 2018 | Transactions of Tianjin University2018，24，1： | 0 |
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