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Data-driven active vibration control for helicopter with trailing-edge flaps using adaptive dynamic programming

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Chinese Journal of Aeronautics 2024年第6期37卷 151-166页

作者： Yu CHEN Qun ZONG xiuyun zhang Jinna LI School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China School of Information and Control Engineering Liaoning Petrochemical UniversityFushun 113001China

The helicopter Trailing-Edge Flaps(TEFs)technology is one of the recent hot topics in morphing wing *** employing controlled deflection,TEFs can effectively reduce the vibration level of ***,designing specific vibration reduction control methods for the helicopters equipped with trailing-edge flaps is of significant practical *** paper studies the optimal control problem for helicopter-vibration systems with TEFs under the framework of adaptive dynamic programming combined with Reinforcement Learning(RL).Time-delay and disturbances,caused by complexity of helicopter dynamics,inevitably deteriorate the control performance of vibration *** solve this problem,a zero-sum game formulation with a linear quadratic form for reducing vibration of helicopter systems is presented with a virtual *** this context,an off-policy reinforcement learning algorithm is developed to determine the optimal control *** algorithm utilizes only vertical vibration load data to achieve a policy that reduces vibration,attains Nash equilibrium,and addresses disturbances while compensating for time-delay without knowledge of the dynamics of the helicopter *** effectiveness of the proposed method is demonstrated in a virtual platform.

关键词： Active control Adaptive dynamic program-ming Helicopter rotor Vibration control Zero-sum game

Molecular dynamics simulation of graphene sinking during chemical vapor deposition growth on semi-molten Cu substrate

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npj Computational Materials 2020年第1期6卷 1548-1557页

作者： Ziwei Xu Guanghui Zhao Lu Qiu xiuyun zhang Guanjun Qiao Feng Ding School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan 44919Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China

Copper foil is the most promising catalyst for the synthesis of large-area,high-quality monolayer ***,it has been found that the Cu substrate is semi-molten at graphene growth *** this study,based on a self-developed C–Cu empirical potential and density functional theory(DFT)methods,we performed systematic molecular dynamics simulations to explore the stability of graphene nanostructures,i.e.,carbon nanoclusters and graphene nanoribbons,on semi-molten Cu substrates.

关键词： dynamics semi monolayer

sp^(2) to sp^(3) hybridization transformation in 2D metal-semiconductor contact interface suppresses tunneling barrier and Fermi level pinning simultaneously

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Nano Research 2024年第11期17卷 10227-10234页

作者： Wenchao Shan Anqi Shi Zhuorong Zhong xiuyun zhang Bing Wang Yongtao Li Xianghong Niu School of Science State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) and College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications Nanjing 210023 China College of Physics Science and Technology Yangzhou University Yangzhou 225002 China Institute for Computational Materials Science Joint Center for Theoretical Physics (JCTP) School of Physics and Electronics Henan University Kaifeng 475004 China Key Laboratory of Quantum Materials and Devices (Southeast University) Ministry of Education Nanjing 211189 China

Van der Waals (vdWs) stacking of two-dimensional (2D) materials can effectively weaken the Fermi level pinning (FLP) effect in metal/semiconductor contacts due to dangling-bond-free surfaces. However, the inherent vdWs gap always induces a considerable tunneling barrier, significantly limiting carrier injection. Herein, by inducing a sp^(2) to sp^(3) hybridization transformation in 2D carbon-based metal via surface defect engineering, the large orbital overlap can form an efficient carrier channel, overcoming the tunneling barrier. Specifically, by selecting the 2D carbon-based X_(3)C_(2) (X = Cd, Hg, and Zn) metal and the 2D MSi_(2)N_(4) (M = Cr, Hf, Mo, Ti, V, and Zr) semiconductor, we constructed 36 metal/semiconductor contacts. For vdWs contacts, although Ohmic contacts can be formed at the interface, the highest tunneling probability (P TB) is only 3.11%. As expected, the P TB can be significantly improved, as high as 48.73%, when MSi_(2)N_(4), accompanied by surface nitrogen vacancies, forms an interface covalent bond with X_(3)C_(2). Simultaneously, weak FLP and Ohmic contact remain at the covalent-bond-based surface, attributing to the protection of the MSi_(2)N_(4) band-edge electronic states by the outlying Si-N sublayer. Our work provides a promising path for advancing the progress of 2D electronic and photoelectronic devices.

关键词： two-dimensional(2D)material metal-semiconductor contacts tunneling-barrier Schottky barrier density functional theory

Interpretable Machine Learning-Assisted High-Throughput Screening for Understanding NRR Electrocatalyst Performance Modulation between Active Center and C-N Coordination

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Energy & Environmental Materials 2024年第5期7卷 263-271页

作者： Jinxin Sun Anjie Chen Junming Guan Ying Han Yongjun Liu Xianghong Niu Maoshuai He Li Shi Jinlan Wang xiuyun zhang College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China State Key Laboratory of Organic Electronics and Information Displays(KLOEID)&Institute of Advanced Materials(IAM) School of ScienceNanjing University of Posts and TelecommunicationsNanjing 210023China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China School of Physics&Key Laboratory of Quantum Materials and Devices Ministry of EducationSoutheast UniversityNanjing 20089China

Understanding the correlation between the fundamental descriptors and catalytic performance is meaningful to guide the design of high-performance electrochemical ***,exploring key factors that affect catalytic performance in the vast catalyst space remains challenging for ***,to accurately identify the factors that affect the performance of N2 reduction,we apply interpretable machine learning(ML)to analyze high-throughput screening results,which is also suited to other surface reactions in *** expound on the paradigm,33 promising catalysts are screened from 168 carbon-supported candidates,specifically single-atom catalysts(SACs)supported by a BC_(3)monolayer(TM@V_(B/C)-N_(n)=_(0-3)-BC_(3))via high-throughput ***,the hybrid sampling method and XGBoost model are selected to classify eligible and non-eligible *** feature interpretation using Shapley Additive Explanations(SHAP)analysis,two crucial features,that is,the number of valence electrons(N_(v))and nitrogen substitution(N_(n)),are screened *** SHAP analysis and electronic structure calculations,the synergistic effect between an active center with low valence electron numbers and reasonable C-N coordination(a medium fraction of nitrogen substitution)can exhibit high catalytic ***,six superior catalysts with a limiting potential lower than-0.4 V are *** workflow offers a rational approach to obtaining key information on catalytic performance from high-throughput screening results to design efficient catalysts that can be applied to other materials and reactions.

关键词： electrochemical nitrogen reduction feature engineering high-throughput screening machine learning

Aqueous Zn^(2+)/Na^(+) dual-salt batteries with stable discharge voltage and high Coulombic efficiency by systematic electrolyte regulation

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Science China Chemistry 2022年第2期65卷 399-407页

作者： Chunli Wang Lianshan Sun Maoxin Li Lin Zhou Yong Cheng Xin Ao xiuyun zhang Limin Wang Bingbing Tian Hong Jin Fan SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China School of Physical and Mathematical Science Nanyang Technological UniversitySingapore 637371Singapore China-Singapore International Joint Research Institute Guangzhou 510663China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryCASChangchun 130022China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China

While aqueous Zn-Na hybrid batteries have garnered widespread attention because of their low cost and high safety,it is still challenging to achieve long cycle-life and stable discharge-voltage due to sluggish reaction kinetics,zinc dendrite formation,and side ***,we design a Zn^(2+)/Na^(+) dual-salt battery,in which sodiation of the NVP cathode favors zinc intercalation under an energy threshold,leading to decoupled redox reactions on the cathode and *** investigations of the electrolyte effects show that the ion intercalation mechanism and the kinetics in the mixture of triflate-and acetate-based electrolytes are superior to those in the common acetate-only *** a result,we have achieved fast discharging capability,suppressed zinc dendrites,a stable discharge voltage at 1.45 V with small polarization,and nearly 100%Coulombic efficiency in the dual-salt mixture electrolyte with optimized concentration of 1 M Zn(OAc)_(2)+1 M NaCF_(3)SO_(3).This work demonstrates the importance of electrolyte regulation in aqueous dual-salt hybrid batteries for the energy storage.

关键词： dual-salt battery high voltage acetate electrolyte zinc dendrite Na_(3)V_(2)(PO_(4))_(3)

MXene:An efficient hemoperfusion sorbent for the removal of uremic toxins

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Journal of Materiomics 2023年第6期9卷 1129-1140页

作者： Tianyi Wang Wei Gu Lu Yu Xin Guo Jian Yang Xiaoyu Sun Jun Guan Lin Zhou Chengyin Wang Hang Yao xiuyun zhang Guoxiu Wang College of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225000Jiangsu ProvinceChina Centre for Clean Energy Technology School of Mathematics and PhysicsFaculty of ScienceUniversity of Technology SydneyBroadwaySydneyNSW2007Australia Clinical Medical College Su Bei People's HospitalYangzhou UniversityYangzhou225000Jiangsu ProvinceChina College of Physical Science and Technology Yangzhou UniversityYangzhou225000Jiangsu ProvinceChina

MXene,a family of two-dimensional(2D)transition metal carbides and nitrides have attracted extensive interests for many biochemical applications,including tumour elimination,biosensors,and magnetic resonance imaging(MRI).In this article,we firstly discovered that Ti3C2Tx MXene exhibited a highly efficient adsorption capability as hemoperfusion absorbent towards middle-molecular mass and protein bound uremic toxins in the end stage of renal disease(ESRD)*** scale investigations reveal that the high efficiency of MXene for the removal of uremic toxins could be attributed to synergistic effects of physical/chemical adsorption,electrostatic interaction surface of 2D MXene,and transformation of protein secondary structure.2D MXene materials could be used as a new hemoperfusion sorbent with ultrahigh efficiency for removing uremic toxins during the treatment of kidney disease.

关键词： 2D materials MXene Hemoperfusion Middle molecular weight toxin Protein bound toxin Adsorption

Highly selective growth of(6,5)single-walled carbon nanotubes from sigma phase alloy catalyst

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Nano Research 2024年第3期17卷 1999-2003页

作者： Liantao Xin Chen Ma Qianru Wu Shaokang Liu Linhai Li xiuyun zhang Liu Qian Maoshuai He Dong Li Fangqian Han Shulan Hao Lihu Feng Yahan Li Huaping Liu Lili zhang Chang Liu Jin zhang College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The chirality structure of a single-walled carbon nanotube(SWNT)strongly depends on the composition of catalyst used in the chemical vapor deposition *** this study,we develop a porous magnesia supported manganese-rhenium(MnRe/MgO)catalyst for chirality-selective synthesis of *** characterizations reveal that(6,5)tubes with a selectivity higher than 70%are grown from the Re-rich MnRe/MgO *** comparing the SWNT growth results with those of monometallic Mn or Re,the formation of sigma phase,an intermetallic compound occurring in transition-metal alloy systems,is revealed to be crucial for the dominant synthesis of(6,5)*** work not only extends the application of sigma phase alloy for catalytic synthesis of SWNTs,but also sheds lights on the growth of SWNTs with a high chirality selectivity.

关键词： single-walled carbon nanotubes sigma phase manganese-rhenium catalyst selective growth transition-metal alloy

Determination of <i>Salmonella pullorum</i>with Nanoparticles Immune Based Lateral Flow Strip Assay

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Advances in Microbiology 2015年第5期5卷 364-369页

作者： Bin Wu xiuyun zhang Wei Pan Lin zhang Fan zhang Liaoning Entry-Exit Inspection and Quarantine Bureau Dalian China Chinese Academy of Inspection and Quarantine Beijing China

The isolation and culture of conventional detection method of salmonella can not meet the testing requirements of quick and easy detection at the grassroots level. In this study, we prepare the fluorescent nanoparticles as a marker, covalently conjugate with monoclonal antibodies of Salmonella pullorum. The whole Salmonella pullorum antigen and goat anti-mouse antibody sprayed on the nitrocellulose membranes are used as test line and control line. The fluorescence nanoparticles immune based lateral flow strips are made according to the principle of antigen-antibody immune response. The test strips may interpret results within 30 min. The results of the salmonella A, S. agona, S. chester and S. arechavaleta are positive, including, S. agona for weakly positive. After analysis, it is found that in addition to the salmonella of group A, the other positive salmonella are in group B. But it is negative of S. derby, S. rissen, and other 6 kinds of salmonella, with good specificity. The fluorescence nanoparticles immune based lateral flow strips are a little of sample can be detected fast, easily, inexpensive, easy to universal without professional technical personnel detection method. It provides a new detection method for the detections of Salmonella pullorum.

关键词： Monoclonal Antibody Nanoparticles Fluorescence Nanoparticles Immune Based Lateral Flow Strips Salmonella pullorum

Optimal Satellite Formation Reconfiguration Using Pseudospectral Method and Co-evolutionary Particle Swarm Optimization

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Optimal Satellite Formation Reconfiguration Using Pseudospec...