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Stabilization of Asymmetric Underactuated Ships With Full-State Constraints: From Underactuated to Nonholonomic Configuration

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IEEE/CAA Journal of Automatica Sinica 2022年第12期9卷 2197-2199页

作者： Zhongcai Zhang Linran Tian heng su Yuqiang Wu School of Engineering Qufu Normal UniversityRizhao 276826China

Dear Editor,This letter addresses the stabilization control of an asymmetric underactuated surface ship with full-state constraints. To simplify the design of controller, the original ship model is transformed into a nonlinear cascade system with a minimum phase. Then, the stabilization of the cascade system is further processed into an equivalent stabilization of a reduced-order nonholonomic-like system. A discontinuous stabilization control method is proposed through a combination of state-scaling and state-dependent function transformations, nonlinear filters, and switching technologies. Stability analysis demonstrates that under the newly designed stabilization controller, the closed-loop system states are bounded and the desired state constraints are not violated.

关键词： stabilization system nonlinear

Heat Saturation Time of Solid Spherical Regenerator of HTAC

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Journal of Iron and Steel Research International 2006年第2期13卷 10-13页

作者： LU Qing-heng Cheng su-sen YANG Tian-jun Metallurgy Engineering School University of Science and Technology Beijing Beijing 100083 China

In order to control the heat saturation time, the temperature field of the regenerators of high temperature air combustion （HTAC） technology after reheating furnace was studied. A one-dimensional unsteady mathematical model was established and discretized through finite difference method. The relationship between the heat saturation time and some factors was determined through the calculation of a program developed by language C. The heat saturation time decreases with the increase of heat convection coefficient, however, the increase of heat capacity, density and radius of regenerator all increase the heat saturation time approximately linearly.

关键词： solid spherical regenerator heat saturation time mathematical model

A news picture geo-localization pipeline based on deep learning and street view images

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International Journal of Digital Earth 2022年第1期15卷 1485-1505页

作者： Tianyou Chu Yumin Chen heng su Zhenzhen Xu Guodong Chen Annan Zhou School of Resource and Environment Science Wuhan UniversityWuhanPeople’s Republic of China

Numerous news or event pictures are taken and shared on the internet every day that have abundant information worth being mined,but only a small fraction of them are *** visual content of the news image hints at clues of the geographical location because they are usually taken at the site of the incident,which provides a prerequisite for *** paper proposes an automated pipeline based on deep learning for the geo-localization of news pictures in a large-scale urban environment using geotagged street view images as a reference *** approach obtains location information by constructing an attention-based feature extraction ***,the image features are aggregated,and the candidate street view image results are retrieved by the selective matching kernel ***,the coordinates of the news images are estimated by the kernel density prediction *** pipeline is tested in the news pictures in Hong *** the comparison experiments,the proposed pipeline shows stable performance and generalizability in the large-scale urban *** addition,the performance analysis of components in the pipeline shows the ability to recognize localization features of partial areas in pictures and the effectiveness of the proposed solution in news picture geo-localization.

关键词： Street view images geo-localization image retrieval social media

Low-dose clozapine-related seizure: A case report and literature review

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World Journal of Clinical Cases 2021年第20期9卷 5611-5620页

作者： Dan-Sheng Le heng su Zheng-Luan Liao En-Yan Yu The Second Clinical Medical College Zhejiang Chinese Medicine UniversityHangzhou 310051Zhejiang ProvinceChina Department of Psychiatry Zhejiang Provincial People’s HospitalHangzhou 310000Zhejiang ProvinceChina Department of Psychiatry The Cancer Hospital of the University of Chinese Academy of Sciences(Zhejiang Cancer Hospital)Institute of Basic Medicine and CancerChinese Academy of SciencesHangzhou 310022Zhejiang ProvinceChina

BACKGROUND Treatment-resistant schizophrenia is a severe form of schizophrenia characterized by poor response to at least two antipsychotic drugs and is typically treated with ***,clozapine lowers the epileptic threshold,leading to seizures,which are severe side effects of antipsychotics that result in multiple ***-related seizures are generally considered to be dose-dependent and especially rare in the low-dose(150-300 mg/d)clozapine treated *** to clinical rarity,little is known about its clinical characteristics and *** suMMARY A 62-year-old Chinese man with a 40-year history of treatment-resistant schizophrenia presented to the Emergency Department with symptoms of myoclonus,consciousness disturbance and vomiting after taking 125 mg *** admission,the patient had a suddenly generalized tonic-clonic seizure lasting for about half a minute with persistent disturbance of consciousness,fever,cough and bloody sputum,which was considered to be low-dose clozapine-related *** antiepileptic and multiple anti-infection treatments,the patient was discharged without epileptic or psychotic *** Our aim is to highlight the early prevention and optimal treatment of clozapine related seizure through case analysis and literature review.

关键词： Seizure Treatment-resistant schizophrenia Antipsychotic Antiepileptic Electroconvulsive therapy Case report

Funnel testing in webpage optimisation:representation,design and analysis

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Statistical Theory and Related Fields 2017年第1期1卷 3-14页

作者： heng su C.F.Jeff Wu School of Industrial and Systems Engineering Georgia Institute of TechnologyWells Fargo BankCharlotteNCUSA

When optimizingwebpages in order to achieve the best conversion rate,the traditional approach is to isolate and analyze themseparately through a sequence of *** thispaper,wepropose a new framework to study a systemofwebpages simultaneously through the use of directed graph,fractional factorial design and simple optimization *** illustrative example shows that such complicated web systems can be easily studied and optimized by using the proposed methodology.

关键词： Conversion rate optimization webgraph factorial design design of experiment

Sn_(4)P_(3)-induced crystalline/amorphous composite structures for enhanced sodium-ion battery anodes

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Journal of Materials Science & Technology 2020年第20期52卷 73-80页

作者： Jaffer Saddique Xu Zhang Tianhao Wu heng su Shiqi Liu Dian Zhang Yuefei Zhang Haijun Yu College of Materials Science and Engineering Key Laboratory of Advanced Functional Materials of Education Ministry of ChinaBeijing University of TechnologyBeijing 100124China Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China

The optimization of anode materials such as Sn,P and Sn4P3 in terms of capacity and cyclability is crucial to improve the overall performance of sodium-ion ***,the delicate fabrication of these materials,including the balanced crystalline/amorphous domains,reasonable particle size and distribution,complementary components exhibiting synergetic reactions,among others,still greatly retards the realization of maximum ***,a series of Sn/P-based composite materials with a plum pudding configuration were fabricated to achieve controlled crystalline/amorphous structures as well as optimized size and distribution in a carbon *** using a facile and low-cost ball milling method,the structural transformation of Sn4P3 into phase-separated crystalline Sn and amorphous P in a carbonaceous framework can be finely controlled,producing a series of binary(Sn4 P3/C),quaternary(Sn4P3/Sn/P/C) and ternary(Sn/P/C) *** to the complementary components,crystalline/amorphous adjustment,crystallite sizes and well-integrated interfaces,the quaternary Sn4P3/Sn/P/C composite showed the best electrochemical performance,with a noticeable long-cycle performance of 382 mA hg-1 and 86% capacity retention for nearly 300 *** from binary and ternary composites,the discharge of quaternary composite generates no noticeable signals of Na15Sn4 and Na3 P in the ex-situ X-ray diffraction patterns,suggesting the crystallite growth of sodiation products can be ***,Sn4 P3 in the quaternary composite can be partially regenerated in the desodiation reaction,implying the significant short-range interaction and thus better synergetic reactions between Sn and P *** results demonstrate that the design and organization of crystalline/amorphous structures can serve as an efficient strategy to develop novel electrode materials for sodium ion batteries.

关键词： Sodium ion battery Tin phosphides Anode materials Composite structure Reaction mechanism

Heterostructure TiO2 polymorphs design and structure adjustment for photocatalysis

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Science Bulletin 2018年第5期63卷 314-321页

作者： Di He heng su Xueqiao Li Haijun Yu Muhammad Zubair Lin Wang Shengcheng Mao Jinshu Wang College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China Institute of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing 100124 China

Atomic composite-structure materials play an important role in energy generation and storage application fields for their advanced *** heterostructured semiconductors is a promising strategy to devise photocatalytic systems with high ***,most studied hererostructures are those semiconductors with different materials formed by multi-steps,researches on in-situ formed hererostructure originated from the same precursor are few reported,and the effects of different structure ratios on photocatalytic performance are ***,according to in-situ temperature X-ray diffraction and transmission electron microscope techniques,a nano-sized in-situ formed heterostructure of TiO_2semiconductors with anatase and TiO_2-B crystalline structures were designed,their structure ratios were adjusted,the heterostructure interface and photocatalytic reaction mechanism were also *** show that high-quality heterojunction and optimum structure ratios have vital influence on photocatalytic performance,there is an obvious synergetic effect between anatase and TiO_2-B structure,degradation reactions on methyl orange(MO)under ultraviolet light irradiation prove that the highest activity toward MO removal can be obtained for material with 82.5%anatase structure.

关键词： Photocatalysis Anatase TiO2-B Structure ratios Heterojunctions

Atomic pair distribution function research on Li_2MnO_3 electrode structure evolution

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Science Bulletin 2019年第8期64卷 553-561页

作者： Yubo Yang heng su Tianhao Wu Yuyuan Jiang Danmin Liu Pengfei Yan Haolai Tian Haijun Yu College of Materials Science and Engineering Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of Technology Institute of Solid State Microstructure and Properties Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of Technology China Spallation Neutron Source Dongguan Institute of Neutron Science Institute of High Energy of Physics Chinese Academy of Sciences

The mechanism research of structure-related reactions on Li_2MnO_3 is important to enhance the electrochemical performance of lithium-manganese-rich layered *** there are some reports on the structure evolution of Li_2MnO_3 during cycling process,the employed research techniques are very limited,mainly in/ex-situ X-ray diffraction,X-ray absorption and transmission electron ***,atomic pair distribution function,a method to study the local atomic arrangement on the basis of average spectroscopic information,is used for the first time to study the local structure evolution of Li_2MnO_3 during electrochemical charge/discharge *** results clearly demonstrate that Mn^(3+)/Mn^(4+) redox couple is activated and Mn ions are reduced during discharging *** Mn ions in Mn layers can significantly migrate to Li layers and occupy the octahedral *** a result,a portion of inserted Li ions can occupy the face-shared tetrahedron sites,accompanied by the formation of local spinel-like *** work provides an important and suitable method based on the average spectroscopic information to investigate the local structure of electrode materials of lithium-ion batteries as well as other advanced battery systems.

关键词： Li-ion battery Lithium-manganese-rich layered oxides Local structure Pair distribution function Structure evolution

Ghost images reconstructed from fractional-order moments with thermal light

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Chinese Physics B 2018年第12期27卷 238-243页

作者： De-Zhong Cao Qing-Chen Li Xu-Cai Zhuang Cheng Ren su-heng Zhang Xin-Bing Song Department of Physics Yantai UniversityYantai 264005China College of Physics Science and Technology Hebei UniversityBaoding 071002China Department of Physics of Complex Systems Weizmann Institute of ScienceRehovot 76100Israel

We present the joint probability density function(PDF) between the bucket signals and reference signals in thermal light ghost imaging, by regarding these signals as stochastic variables. The joint PDF allows us to examine the fractional-order moments of the bucket and the reference signals, in which the correlation orders are fractional numbers,other than positive integers in previous studies. The experimental results show that various images can be reconstructed from fractional-order moments. Negative(positive) ghost images are obtained with negative(positive) orders of the bucket signals. The visibility and peak signal-to-noise ratios of the diverse ghost images depend greatly on the fractional orders.

关键词： ghost imaging intensity correlation function fractional-order moments