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An Empirical Study on Google Research Football Multi-agent Scenarios

Machine Intelligence Research 2024年第3期21卷 549-570页

作者： Yan Song He Jiang Zheng Tian haifeng zhang Yingping zhang Jiangcheng Zhu Zonghong Dai Weinan zhang Jun Wang Institute of Automation Chinese Academy of SciencesBeijing100190China Digital Brain Lab Shanghai200001China ShanghaiTech University Shanghai200001China Huawei Cloud Guiyang550003China Shanghai Jiao Tong University Shanghai200001China University College London LondonWC1E 6PTUK

Few multi-agent reinforcement learning (MARL) researches on Google research football (GRF) focus on the 11-vs-11 multi-agent full-game scenario and to the best of our knowledge, no open benchmark on this scenario has been released to the public. In this work, we fill the gap by providing a population-based MARL training pipeline and hyperparameter settings on multi-agent football scenario that outperforms the bot with difficulty 1.0 from scratch within 2 million steps. Our experiments serve as a reference for the expected performance of independent proximal policy optimization (IPPO), a state-of-the-art multi-agent reinforcement learning algorithm where each agent tries to maximize its own policy independently across various training configurations. Meanwhile, we release our training framework Light-MALib which extends the MALib codebase by distributed and asynchronous implementation with additional analytical tools for football games. Finally, we provide guidance for building strong football AI with population-based training and release diverse pretrained policies for benchmarking. The goal is to provide the community with a head start for whoever experiment their works on GRF and a simple-to-use population-based training framework for further improving their agents through self-play. The implementation is available at https://***/Shanghai-Digital-Brain-Laboratory/DB-Football.

关键词： Multi-agent reinforcement learning(RL) distributed RL system population-based training reward shaping game theory.

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Highly efficient catalyst for 1,1,2-trichloroethane dehydrochlorination via BN_(3) frustrated Lewis acid-base pairs

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Nano Research 2024年第6期17卷 4773-4781页

作者： Yuxue Yue Fangmin Zuo Bolin Wang Xiaoling Xian Jun Tang haifeng zhang Zilong zhang Qingping Ke Wei Chen School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Industrial Catalysis Institute of Zhejiang University of Technology Hangzhou 310014China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China

In this study,a novel non-metallic carbon-based catalyst co-doped with boron and nitrogen(B,N)was successfully synthesized.By precisely controlling the carbonization temperature of a binary mixed ionic liquid,we selectively modified the doping site structure,ultimately constructing a B,N co-doped frustrated Lewis acid-base pair catalyst.This catalyst exhibited remarkable catalytic activity,selectivity,and stability in the dehydrochlorination reaction of 1,1,2-trichloroethane(TCE).Detailed characterization and theoretical calculations revealed that the primary active center of this catalyst was the BN_(3)configuration.Compared to conventional graphitic N structures,the BN_(3)structure had a higher p-band center,ensuring superior adsorption and activation capabilities for TCE during the reaction.Within the BN_(3)site,three negatively charged nitrogen atoms acted as Lewis bases,while positively charged boron atoms acted as Lewis acids.This synergistic interaction facilitated the specific dissociation of chlorine and hydrogen atoms from TCE,significantly enhancing the 1,1-dichloroethene selectivity.Through this research,we not only explored the active site structure and catalytic mechanism of B,N co-doped catalysts in depth but also provided an efficient,selective,and stable catalyst for the dehydrochlorination of TCE,contributing significantly to the development of non-metallic catalysts.

关键词： B N co-doped sites dehydrochlorination frustrated Lewis acid-base pairs catalytic mechanism

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Erratum to:Bioinformatic analysis for potential biological processes and key targets of heart failure-related stroke

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第4期25卷 359-359页

作者： Chiyu LIU Sixu CHEN haifeng zhang Yangxin CHEN Qingyuan GAO Zhiteng CHEN Zhaoyu LIU Jingfeng WANG Department of Cardiology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China Laboratory of Cardiac Electrophysiology and Arrhythmia in Guangdong Province Guangzhou 510120China Guangdong Provincial Key Laboratoryof Malignant Tumor Epigenetics and Gene Regulation Sun Yat-Sen Memorial HospitalSun Yat-Sen UniversityGuangzhou 510120China

Erratum to:J Zhejiang Univ-Sci B(Biomed&Biotechnol)202122(9):718-732 https:/***/10.1631/jzus.B2000544.The original version of this article(Liu et al.,2021)unfortunately contained a mistake:statement of equal contribution is missing.This correction article shows that Chiyu LIU and Sixu CHEN contributed equally to this work.The original article has been corrected.

关键词： statement correction potential

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Identification of unknown disinfection byproducts in drinking water produced from Taihu Lake source water

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Journal of Environmental Sciences 2022年第3期34卷 1-11页

作者： Jiabao Li haifeng zhang Juan Wang Zhiyong Yu Hongyan Li Min Yang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesUniversity of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Although disinfection byproducts(DBPs) in drinking water have been suggested as a cancer causing factor, the causative compounds have not yet been clarified. In this study, we used liquid chromatography quadrupole-time-of-flight spectrometry(LC-QTOF MS) to identify the unknown disinfection byproducts(DBPs) in drinking water produced from Taihu Lake source water, which is known as a convergence point for the anthropogenic pollutants discharged from intensive industrial activities in the surrounding regions. In total, 91 formulas of DBPs were discovered through LC-QTOF MS nontarget screen, 81 of which have not yet been reported. Among the 91 molecules, 56 only contain bromine, 15 only contain chlorine and 20 DBPs have both bromine and chlorine atoms. Finally, five DBPs including 2,4,6-tribromophenol, 2,6-dibromo-4-chlorophenol, 2,6-dichloro-4-bromophenol, 4-bromo-2,6-di-tert-butylphenol and 3,6-dibromocarbazole were confirmed using standards. The former three compounds mainly formed in the predisinfection step(maximum concentration, 0.2-2.6 μg/L), while the latter two formed in the disinfection step(maximum concentration, 18.2-33.6 ng/L). In addition, 19 possible precursors of the discovered DBPs were detected, with the aromatic compounds being a major group. 2,6-di-tert-butylphenol as the precursor of 4-bromo-2,6-di-tert-butylphenol was confirmed with standard, with a concentration of 20.3 μg/L in raw water. The results of this study show that brominated DBPs which are possibly formed from industrial pollutants are relevant DBP species in drinking water produced form Taihu source water, suggesting protection of Taihu Lake source water is important to control the DBP risks.

关键词： Source water Disinfection byproducts Brominated disinfection byproducts Nontarget analysis Precursors Source water pollution

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Impact of transparent exopolymer particles on the dynamics of dissolved organic carbon in the Amundsen Sea,Antarctica

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Advances in Polar Science 2024年第1期35卷 123-131页

作者： HU Ji XUE Siyou ZHAO Jun LI Dong zhang haifeng YU Peisong zhang Cai YANG Xufeng PAN Jianming Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China

The Southern Ocean is an important carbon sink pool and plays a critical role in the global carbon cycling.The Amundsen Sea was reported to be highly productive in inshore area in the Southern Ocean.In order to investigate the influence of transparent exopolymer particles(TEP)on the behavior of dissolved organic carbon(DOC)in this region,a comprehensive study was conducted,encompassing both open water areas and highly productive polynyas.It was found that microbial heterotrophic metabolism is the primary process responsible for the production of humic-like fluorescent components in the open ocean.The relationship between apparent oxygen utilization and the two humic-like components can be accurately described by a power-law function,with a conversion rate consistent with that observed globally.The presence of TEP was found to have little impact on this process.Additionally,the study revealed the accumulation of DOC at the sea surface in the Amundsen Sea Polynya,suggesting that TEP may play a critical role in this phenomenon.These findings contribute to a deeper understanding of the dynamics and surface accumulation of DOC in the Amundsen Sea Polynya,and provide valuable insights into the carbon cycle in this region.

关键词： dissolved organic matter chromophoric dissolved organic matter excitation-emission matrix coupled with parallel factor analysis transparent exopolymer particles Amundsen Sea Antarctica

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Microstructure and mechanical properties of lightweight Ti_(3)Zr_(1.5)NbVAl_(x)(x=0,0.25,0.5 and 0.75) refractory complex concentrated alloys

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Journal of Materials Science & Technology 2022年第35期130卷 64-74页

作者： Shuai Zeng Yongkang Zhou Huan Li Hongwei zhang haifeng zhang Zhengwang Zhu Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Combining high strength and good ductility is an urgent requirement for traditional structural materials,but yet a challenge.Newly emerging ductile Ti_(3)Zr_(1.5)VNbAl_(x)(x=0,0.25,0.5,0.75) refractory complex concentrated alloys(RCCAs) with high specific strength were designed and synthesized via vacuum arc-melting.Alloying effects of Al on microstructure and mechanical properties were systematically investigated.It was found that the phase composition in this alloy system changes from the single disordered body-centered cubic(BCC) phase to a nano-scale mixture of co-continuous disordered BCC and ordered B2 phases with the increase of Al concentration.This structure transition results in a remarkable increase in the yield strength of the RCCAs,i.e.,from 790 to 1118 MPa,leading to a superior specific yield strength of 199.4 MPa cm^(3)g^(-1)for the Al0.75 alloy,meanwhile,the tension plasticity maintained at~10%.TEM observation demonstrates that cell-forming structure and HDDWs induced by wave slip play a crucial role of considerable plasticity in Al0.25 alloy,whereas in Al0.5 alloy,microbands induced by planar slip dominant deformation behavior.The current work is important not only for providing novel high strength and tough structural materials with low density,but also sheds light on designing highperformance lightweight alloys with tunable microstructure.

关键词： Refractory complex concentrated alloys Microstructure Mechanical properties Strengthening mechanisms Deformation behavior

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Cryogenic wear behaviors of a metastable Ti-based bulk metallic glass composite

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Journal of Materials Science & Technology 2023年第3期134卷 33-41页

作者： Yue Ren Tingyi Yan Zhuobin Huang Qing Zhou Ke Hua Xiaolin Li Yin Du Qian Jia Long zhang haifeng zhang haifeng Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Bulk metallic glass composites(BMGCs)are proven to be excellent candidates for cryogenic engineering applications due to their remarkable combination of strength,ductility and toughness.However,few efforts have been done to estimate their wear behaviors that are closely correlated to their practical service.Here,we report an improvement of∼48%in wear resistance for a Ti-based BMGC at the cryogenic temperature of 113 K as compared to the case at 233 K.A pronounced martensitic transformation(β-Ti→α''-Ti)was found to coordinate deformation underneath the worn surface at 233 K but was significantly suppressed at 113 K.This temperature-dependent structural evolution is clarified by artificially inducing a pre-notch by FIB cutting on aβ-Ti crystal,demonstrating a strain-dominated martensitic transformation in the BMGC.The improved wear resistance and suppressed martensitic transformation in BMGC at 113 K is associated with the increased strength and strong confinement of metallic glass on metastable crystalline phase at the cryogenic temperature.The current work clarifies the superior cryogenic wear resistance of metastable BMGCs,making them excellent candidates for safety-critical wear applications at cryogenic temperatures.

关键词： Bulk metallic glass composites Martensitic transformation Cryogenic temperature Wear

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Wettability and Interfacial Reactions Between Metallic Glass Melts and Cu/Mo Used as Roller Materials for Twin-Roll Casting

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1221-1230页

作者： Yi Wu Long zhang Hongwei zhang Huameng Fu Zhengwang Zhu Hong Li Aimin Wang haifeng zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Twin-roll casting has been recently revealed to be an effi cient technique to produce rejuvenated metallic glass(MG)strips.Due to the high melting point and high hardness,pure Mo is considered as a good roller material as pure Cu.However,the wettability and interfacial reactions between MG melts and Cu or Mo remain largely unknown.In this work,a series of sessile droplet wetting experiments are designed to investigate the wettability and reactions between Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)(Vit.1)or(Zr 0.401 Ti_(0.133)Cu_(0.118)Ni_(0.101)Be_(0.247))_(99)Nb_(1)(Nb1)MG melts and Cu/Mo substrates at temperatures of 1073,1123 and 1173 K.It is found that the wettability and interfacial reactions of the Vit.1 and Nb1 MG melts on the Cu substrates are very similar.The equilibrium contact angles are~30°at 1073 K and~25°-27°at 1123 K.The MG melts completely spread out on the Cu substrates at 1173 K.Cu substrates are slightly dissolved in the MG melts event at 1073 K,and a transitional reaction layer exists between the droplet and the Cu substrate.In comparison,the Vit.1 MG melt exhibits a much improved wettability on the Mo substrate.The equilibrium contact angle of the Vit.1/Mo is only 6°at 1073 K and 5°at 1123 K.No signifi cant diff usion of Mo into the droplet occurs even at 1173 K with a holding time of~30 min.The interfaces of the Vit.1/Mo samples are sharp,and no interfacial reaction layers form.These fi ndings indicate that pure Mo can be a good roller material for twin-roll casting at high temperatures,and the Mo-made rollers are expected of capability to produce MG strips with good quality.

关键词： Metallic glass Wettability Interfacial reaction Twin-roll casting Roller material

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Defect engineering endows NiTi stents with photothermal-enhanced catalytic activity for high-efficiency tumor therapy

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Journal of Materials Science & Technology 2023年第24期155卷 227-237页

作者： haifeng zhang Min Xing Wenhao Qian Shun Xing Jiajun Qiu Xuanyong Liu School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences 1 Sub-lane Xiangshan Hangzhou 310024 China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China Shanghai Xuhui District Dental Center Shanghai 200032 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

NiTi stents are widely used in clinic for palliative care to relieve obstruction caused by Gastrointestinal(GI)cancers,which have high morbidity and mortality rates.However,tumor invasion and tumor overgrowth around the stent after surgery may lead to re-obstruction of the lumen.Thus,it is urgent to endow NiTi stents with excellent tumor suppressive ability and good biocompatibility.In this study,Ce-BTC was firstly prepared on the surface of NiTi pretreated by alkaline heat,followed by pyrolysis in Ar atmosphere at 450℃.Then,a composite coating consisting of defective cerium oxide and black Ni-Ti hydroxide/oxide was constructed on NiTi surface,which exhibited tumor microenvironment-response and hyperthermia-enhanced catalytic ability.Under near-infrared light irradiation,the photothermal performance of black Ni-Ti hydroxide/oxide and hyperthermia-enhanced catalytic activity of defective cerium oxide can achieve a synergistic effect of photothermal therapy and tumor catalytic therapy.Thereafter,defective cerium oxide can sustainably inhibit the proliferation of residual tumor cells by the generation of reactive oxygen species.Moreover,the composite coating has no obvious cytotoxicity to normal cells.This work provides a new insight for the preparation of stimulus-responsive antitumor stents for palliative treatment of gastrointestinal cancer.

关键词： Defect engineering NiTi Photothermal Nanozyme Tumor therapy

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Design and analysis of the Macau Science Satellite-1's laser retro-reflector array

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Earth and Planetary Physics 2023年第1期7卷 131-135页

作者： ZhiEn Cheng Kai Tang ZhongPing zhang haifeng zhang Pu Li MingLiang Long Shanghai Astronomical Observatory Chinese Academy of Sciences Key Laboratory of Space Object and Debris Observation Chinese Academy of Sciences

The origin and spatial-temporal variation of the Earth’s magnetic field(EMF) is one of the important scientific problems that has long been unsolved. The Macau Science Satellite-1(MSS-1) under construction is China’s first high-precision EMF measurement satellite. To satisfy the highly precise requirements of the MSS-1 orbit measurement, a light, high-precision, four-prism laser retroreflector array was designed. It weighs approximately 285 g, its effective reflection area is greater than 1.77 cm2, and its size is 100 × 100 ×41 mm. The laser retro-reflector array has excellent performance, and it can achieve a ranging precision at the subcentimeter level for satellite laser ranging. It will be developed and installed on the MSS-1 as a power-free load for high-precision orbit measurement and accurate orbit calibration. The MSS-1 is planned to be brought into the International Laser Ranging Service observations. More than 31satellite laser ranging stations in the International Laser Ranging Service around the world will be able to measure the MSS-1 with long arcs, which will support the scientific mission of high-precision EMF exploration.

关键词： Macau Science Satellite-1 Earth’s magnetic field satellite laser ranging laser retro-reflector array high-precision orbit

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