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| 1 | Global behavior of dynamical agents in directed network显示文摘This paper investigates the global behavior of controlled dynamical agents in directed networks. The agents are Lyapunov stable, are distributed in a line, and communicate through a directed network. The communication topology of the network is characterized by a directed graph and the control protocol is designed in simple linear decentralized feedback law. We study the different conditions under which agents will achieve aggregation, and critical and divergent trajectories, respectively. Our investigation on the dynamical agent system under network is extended to the time-delay network case. Furthermore, we study the case with two pre-specified virtual leaders in the system. Numerical simulations are given and demonstrate that our theoretical results are effective. | Hongwang YU Yufan ZHENG | 2009 | 控制理论与应用(英文版)2009，7，3： | 1 |
| 2 | On the model-based networked control for singularly perturbed systems显示文摘In this paper, the control of a two-time-scale plant, where the sensor is connected to a linear controller/ actuator via a network is addressed. The slow and fast systems of singularly perturbed systems are used to produce an estimate of the plant state behavior between transmission times, by which one can reduce the usage of the network. The approximate solutions of the whole systems are derived and it is shown that the whole systems via the network control are generally asymptotically stable as long as their slow and fast systems are both stable. These results are also extended to the case of network delay. | Hongwang YU Zhiming WANG Yufan ZHENG | 2008 | 控制理论与应用(英文版)2008，6，2： | 1 |
| 3 | An efficient preparation of porous polymeric microspheres by solvent evaporation in foam phase显示文摘This paper reports an efficient method of preparing porous polymeric microspheres by solvent evaporation in foam phase,in which phase separation between polymer and porogen occurs in foam phase instead of that in water phase by using the traditional solvent eva poration method.The method provides outstanding features,including being time-saving,of high-yield and able for continuous production,in which formation of porous polymeric microspheres finished within 3 min with a high production yield up to approximate 95 wt% and the process was able to be developed into a continuous process for production of porous polymeric microspheres.It was also universal to non-crosslinked polymers since the method is a development on the traditional emulsion solvent evaporation method.The new method is efficient and can be used potentially on the industrial scale for continuous production of porous polymeric microsphere s. | Yang Yu Guiying Li Wanqing Han Linhua Zhu Tian Si HongWang Yanlin Sun Yanping He | 2021 | Chinese Journal of Chemical Engineering2021，34，1： | 1 |
| 4 | Fabrication of nanostructure in inner-surface of AISI 304 stainless steel pipe with surface plastic deformation显示文摘In the present investigation, a pipe inner-surface grinding(PISG) technique was developed to fabricate nanostructure in the inner-surface of an austenitic 304 stainless steel pipe. PISG was performed by high speed shearing with hard sphere tips, leading to gradient distribution of strain, strain rate and strain gradient along depth. Nano-austenite with an average boundary spacing of 20 nm was generated, followed by deformation microstructure characterized by shear bands, multi-and uni-directional twins and planar dislocation arrays. Deformation induced grain refinement of austenitic 304 stainless steel with low stacking fault energy(SFE) covering 4–5 order's magnitude of length scales toward nanometer regime was unified. | Hongwang Zhang Yiming Zhao Yuhui Wang Huaxin Yu Chunling Zhang | 2018 | Journal of Materials Science & Technology2018，34，11： | 0 |
| 5 | Twinned Martensitic Substructure in a Water Quenched Fe–1.0 wt%C Alloy显示文摘A Fe–1.0 wt%C alloy was quenched into water from 1100 ℃,leading to lath martensite and plate martensite of body-centered tetragonal structure.Both these two martensites have the twinned substructure that generates mirror symmetric diff raction patterns with extra diff raction spots around n/3(112).The twinned substructure has the origin from twinned martensitic variants,namely twin-related crystals separated by{110},rather than{112}<111>deformation twins.Tetragonality eff ect on the electron double diff raction of twinned variants was discussed. | Haidong Sun Zuohua Wang Shuai Zhang Ning Liu Pinwen Zhu Dongli Yu Hongwang Zhang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，7： | 0 |
| 6 | Tempering mechanism of lath martensite induced in IF steel under high pressure显示文摘In this paper,low-and high-strength lath martensite(350 and 640 HV)was fabricated in an IF steel via high pressure martensitic transformation.The microstructure and the softening during their tempering from 200°C to 800°C for 1 h were systematically investigated.A carbon-irrelevant tempering process was proposed,exhibiting a three-stage structural evolution pattern depending upon the tempering de-gree(1-(HV-HV FP)/(HV NP-HV FP),where the HV is the instant hardness,HV NP is the non-tempered hard-ness and HV FP is the fully tempered hardness):(1)low tempered(<10%),removing the loose dislocations and dislocation boundaries within martensitic variants;(2)medium tempered(10%-50%),eliminating the martensitic variant laths via the migration of their terminal tips;(3)highly tempered(>50%),clearing up the remained variant laths via the migration of the triple junctions.Martensite-type microstructure is tailored by low-index lamellar variant boundaries and is thus intrinsically thermally stable,whereas the mobile terminal tips decrease the tempering resistance.The underlying mechanism for such carbon-irrelevant process was discussed and the potential effect on the tempering behavior of carbon-contained martensite was highlighted. | Zuohua Wang Haidong Sun Xiaogang Guo Peng Wang Ning Liu Dongli Yu Hongwang Zhang | 2023 | Journal of Materials Science & Technology2023，，29： | 0 |
| 7 | {112}<111>Twins or Twinned Variants Induced by Martensitic Transformation?显示文摘Twinned substructure in lath martensite was induced in the interstitial free(IF)steel via a high pressure thermal cycle(heating up to 1100℃and holding for 30 min,cooling at 10℃/s to room temperature under a pressure of 4 GPa).Experimental observations and theoretical simulation confrm that the twinned substructure has the origin related to the twinned variants rather than the bcc{112}<111>twins,while extra difraction spots were caused by crystal overlapping rather than any extra phase.The diferences in crystallography and electron difraction behavior between twinned variants and{112}<111>twins were discussed in detail. | Zuohua Wang Haidong Sun Peng Wang Ning Liu Pinwen Zhu Dongli Yu Hongwang Zhang | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，1： | 0 |
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