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Wafer-Scale Vertical 1D GaN Nanorods/2D MoS₂/PEDOT:PSS for Piezophototronic Effect-Enhanced Self-Powered Flexible Photodetectors

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： Tang, Xin Jiang, Hongsheng lin, Zhengliang Wang, Xuan Wang, Wenliang li, guoqiang South China Univ Technol State Key Lab Luminescent Mat & Devices Guangzhou 510640 Peoples R China South China Univ Technol Sch Mat Sci & Engn Dept Elect Mat Guangzhou 510640 Peoples R China

Vertical 1D GaN nanorod arrays/2D MoS2/PEDOT:PSS heterostructures in wafer scale have been fabricated for flexible photodetection ***-powered flexible photodetector at compressive strain reveals a significantly enhanced photoresponse with a responsivity of 2.47 A W-1 and response times of 40/45 mu s, which are superior to the state-of-the-art flexible *** work not only provides a valuable strategy for the design and construction of tunable van der Waals heterostructures, but also opens a new opportunity for flexible sensors. van der Waals (vdW) heterostructures constructed by low-dimensional (0D, 1D, and 2D) materials are emerging as one of the most appealing systems in next-generation flexible photodetection. Currently, hand-stacked vdW-type photodetectors are not compatible with large-area-array fabrication and show unimpressive performance in self-powered mode. Herein, vertical 1D GaN nanorods arrays (NRAs)/2D MoS2/PEDOT:PSS in wafer scale have been proposed for self-powered flexible photodetectors arrays firstly. The as-integrated device without external bias under weak UV illumination exhibits a competitive responsivity of 1.47 A W-1 and a high detectivity of 1.2 x 1011 Jones, as well as a fast response speed of 54/71 mu s, thanks to the strong light absorption of GaN NRAs and the efficient photogenerated carrier separation in type-II heterojunction. Notably, the strain-tunable photodetection performances of device have been demonstrated. Impressively, the device at - 0.78% strain and zero bias reveals a significantly enhanced photoresponse with a responsivity of 2.47 A W-1, a detectivity of 2.6 x 1011 Jones, and response times of 40/45 mu s, which are superior to the state-of-the-art self-powered flexible photodetectors. This work presents a valuable avenue to prepare tunable vdWs heterostructures for self-powered flexible photodetection, which performs well in flexible sensors.

关键词： Vertical nanorod arrays van der Waals heterostructure Piezophototronic effect Self-powered photodetection Flexible sensors

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Artificial optical synaptic devices with ultra-low power consumption

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light(Science & Applications) 2023年第1期12卷 25-27页

作者： guoqiang li State Key Laboratory of Luminous Materials and Devices South China University of TechnologyGuangzhou 510641China

A BP/CdS heterostructure-based artificial photonic synapse with an ultra-low power consumption is proposed,presenting great potential in high-performance neuromorphic vision systems.

关键词： power optical low

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Study on Lag time Model of Fire Plume under a Sloped Ceiling

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Journal of Thermal Science 2014年第5期23卷 486-493页

作者： WANG Jinhui li guoqiang College of Ocean Science and Engineering Shanghai Maritime University State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University

It is known that there is a lag time for smoke plume induced by fires transporting from a fire origin to the location of interest underneath an unconfined and flat *** lag behavior of smoke plume also exists for a fire under a sloped ceiling,and is fundamental to estimate the activation time of a fire detector or other fire extinguishing *** study focuses on the lag time of smoke plume under a sloped *** on the weak-plume theory at early-fire phase and previous studies concerning the fire plume characteristics under a sloped ceiling,a calculation method on lag time of fire plume transporting is presented in ***,two dimensionless equations predicting the lag time of fire plume for steady fire and unsteady fire are proposed ***,the critical time calculation equation is also proposed to determine the applicability of quasi-steady assumption for a time-dependent fire.

关键词： Fire Smoke plume Lag time Quasi-steady assumption Sloped ceiling

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State-of-the-art on resistance of bearing-type bolted connections in high strength steel

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 569-585页

作者： guoqiang li Yifan LYU Yanbo WANG State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China College of Civil Engineering Tongji UniversityShanghai 200092China

With the recent development of material science,high strength steel(HSS)has become a practical solution for landmark buildings and major *** current codes for design of bearing-type bolted connections of steel constructions were established based on the research of conventional *** the mechanical properties of HSS are different from those of conventional steels,more works should be done to develop the appropriate approach for the design of bearing-type bolted connections in HSS.A review of the research carried out on bearing-type bolted connections fabricated from conventional steel and HSS is *** up-to-date tests conducted at Tongji University on four connection types fabricated from three grades of HSS with nominal yield strengths of 550,690,and 890 MPa are *** previous research on failure modes,bearing resistance and the design with consideration of bolt hole elongation are *** is found that the behavior of bolted connections in HSS have no drastic difference compared to that of conventional steel *** the ductility is reduced,plastic deformation capacity of HSS is sufficient to ensure the load redistribution between different bolts with normal construction *** is also found that behavior of each bolt of multi-bolt connections arranged in perpendicular to load direction is almost identical to that of a single-bolt connection with the same end *** connections with bolts arranged in parallel to load direction,the deformation capacity of the whole connection depends on the minimum value between the end distance and the spacing distances in load *** comparison with existing design codes shows that Eurocode3 and Chinese GB50017-2017 are conservative for the design of bolted connections in HSS while AISC 360-16 may overestimate the bearing resistance of bolted connections.

关键词： High strength steel bolted connection bearing behavior design codes

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Updatable timed automata with one updatable clock

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Science China(Information Sciences) 2018年第1期61卷 99-112页

作者： guoqiang li Yunqing WEN Shoji YUEN BASICS School of Software Shanghai Jiao Tong University Graduate School of Information Science Nagoya University

Updatable timed automata(UTAs) proposed by Bouyer ***., is an extension of timed automata(TAs) having the extra ability to update clocks in a more elaborate way than simply reset them to *** reachability of UTAs is generally undecidable, which can be easily gained by regarding a pair of clocks as updatable counters. This paper investigates a subclass of UTAs by restricting the number of updatable clocks to be one. We will show that(1) the reachability of general UTAs with one updatable clock(UTA1 s)is still undecidable, and(2) that of UTA1 s under diagonal-free constraints is decidable, and the complexity is Pspace-complete. The former is achieved by encoding Minsky machines to the general UTA1 s, where two counters are simulated by the updatable clock. The latter is gained by regarding a region of a UTA1 to be an unbounded digiword, and encoding sets of digiwords that are accepted by a one counter automaton where regions are generated as the value of the counter.

关键词： updatable timed automata one counter automata digiword reachability problem

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Constructing format-preserving printing from syntax-directed definitions

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Science China(Information Sciences) 2015年第11期58卷 162-175页

作者： WANG liChao li guoqiang HU ZhenJiang BASICS School of Software Shanghai Jiao Tong University National Institute of Informatics

Transformations between source codes, such as refactorings and program analysis, are frequently used in software engineering. Typically, transformations are effectively implemented using an abstract syntax tree(AST) on the origin source code. However, a critical limitation of ASTs is the loss of layout information such as whitespace and comments, which can result in poor readability. To overcome this shortcoming, this paper proposes a bidirectional transformation(BX) method that maintains consistency in the layout between the origin and transformed. First, a section of origin source code will be translated to a concrete syntax tree(CST) that includes layout information. Second, to make the BX practical, a new method is constructed that matches an AST with its respective CST. Finally, to get a reasonable CST, a method to amend the CST is also provided. We prove that the BX is well-behaved, which implies that it satisfies both the Put Get and Get Put laws. Furthermore, we illustrate the correctness of the methodology by treating XML language as a case study.

关键词： format-preserving bidirectional transformation pretty printing unparsing tree matching

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Structural and Biological Insights into the Hot-Spot Marine Natural Products Reported from 2012 to 2021

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Chinese Journal of Chemistry 2022年第15期40卷 1867-1889页

作者： Mingyu liu Xingwang Zhang guoqiang li Key Laboratory of Marine Drugs Chinese Ministry of EducationSchool of Medicine and PharmacyOcean University of ChinaQingdaoShandong 266003China State Key Laboratory of Microbial Technology Shandong UniversityQingdaoShandong 266237China Laboratory of Marine Drugs and Biological Products National Laboratory for Marine Science and TechnologyQingdaoShandong 266235China

Comprehensive Summary The vast marine ecosystem contains a sea of natural products,which are potential model molecules for new drug *** more than one thousand new structures been discovered each year,the past decade has become the golden time for marine natural product discovery,leading to a valuable but extra-large chemical *** as an epitome of the most promising compounds,which take the ultra-new skeletons and/or excellent bioactivities,this review covers 243 hot-spot marine natural products reported from 2012 to 2021,to abstract some important chemical and/or biological inspirations for marine natural product study and marine drug development in the *** addition,some general rules regarding to the source organism,structure-specialty,organism-structure specificity,and organism-bioactivity relationship of these outstanding compounds will also be presented.

关键词： Natural products Marinedrugs Biological activity Drug discovery Novel structures

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Multi-feature Multimodal Biometric Recognition Based on Quaternion Locality Preserving Projection

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Chinese Journal of Electronics 2019年第4期28卷 789-796页

作者： WANG Zhifang ZHEN Jiaqi li Yanchao li guoqiang HAN Qi Department of Electronic Engineering Heilongjiang University Department of Information Security and Communication Technology Norwegian University of Science and Technology Department of Computer Science and Technology Harbin Institute of Technology

This paper proposed Quaternion locality preserving projection(QLPP) for multi-feature multimodal biometric recognition. Multi-features fill the real part or the three imaginary parts of quaternion to constitute the quaternion fusion features. In quaternion division ring, QLPP extracts the local information and finds essential manifold structure of the quaternion fusion features. Deferent from Quaternion principal component analysis(QPCA) and Quaternion fisher discriminant analysis(QFDA), QLPP takes advantage of the optimal linear approximations to find the nonlinear manifold structures. Two experiments are designed: one fuses four features from two biometric modalities, and the other fuses three features from three biometric *** experimental results show the proposed algorithm achieves much better performance than the unimodal biometric algorithms, the traditional feature level fusion methods(weighted sum rule and series rule) and two quaternion representation methods(QPCA and QFDA).

关键词： Multimodal biometrics Quaternion Feature fusion Quaternion locality preserving projection(QLPP)

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autoC: an efficient translator for model checking deterministic scheduler based OSEK/VDX applications

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Science China(Information Sciences) 2018年第5期61卷 141-155页

作者： Haitao ZHANG Zhuo CHENG guoqiang li Shaoying liU School of Information Science and Engineering Lanzhou University School of Information Science Japan Advanced Institute of Science and Technology School of Software Shanghai Jiao Tong University Faculty of Computer and Information Sciences Hosei University

The OSEK/VDX automotive OS standard has been widely adopted by many automobile manufacturers, such as BMW and TOYOTA, as the basis for designing and implementing a vehicle-mounted OS. With the increasing functionalities in vehicles, more and more multi-task applications are developed based on the OSEK/VDX OS. Currently, ensuring the reliability of the developed applications is becoming a challenge for developers. As to ensure the reliability of OSEK/VDX applications, model checking as a potential solution has attracted great attention in the automotive industry. However, existing model checkers are often unable to verify a large-scale OSEK/VDX application that consists of many tasks, since the corresponding application model too complex. To make existing model checkers more scalable in verifying large-scale OSEK/VDX applications, we describe a software tool named auto C to tackle this problem by automatically translating a multi-task OSEK/VDX application into an equivalent sequential model. We conducted a series of experiments to evaluate the efficiency of auto C. The experimental results show that auto C is not only capable of efficiently sequentializing OSEK/VDX applications, but also of improving the scalability and efficiency of existing model checkers in verifying large-scale OSEK/VDX applications.

关键词： OSEK/VDX application deterministic scheduler software formal method model checking sequentialization

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Microdomain atomic structure of Zr_(50)Pd_(40)Al_(10) metallic glasses and its formation mechanism

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Journal of Materials Science & Technology 2019年第3期35卷 248-253页

作者： Kai li Fangliang Gao Yu-Jen Chou Kaixiang Shen guoqiang li State Key Laboratory of Luminescent Materials and Devices South China University of Technology Engineering Research Center on Solid-State lighting and Its Informationisation of Guangdong Province South China University of Technology Department of Electronic Materials School of Materials Science and Engineering South China University of Technology School of Physics and Telecommunications Engineering South China Normal University

Zr-based Zr_50Pd_40Al_10 metallic glasses has not only crystalline phases of about 5 nm in diameter but also amorphous phases. In this work, the radial distribution functions(RDFs) of amorphous structure of Zr_50Pd_40Al_10 metallic glasses were firstly measured by electron diffraction, and then Reverse Monte Carlo(RMC) optimization accompanied by density functional theory(DFT) calculations. The amorphous structure has not only short-range order but also good medium-range order. In the RDFs of its amorphous structure, the first and the second peaks are located at 2.96 ? and 4.79 ?, respectively. Partial radical distribution functions(PRDFs) show that the contributions of the first and the second nearest-neighbor distances of various atom pairs to the G(r) peak values, and the first nearest-neighbor distances of Pd–Zr and Zr–Zr atom pairs are the sources of main G(r) peak values between 2? and 6?. The competition mechanism for generating the Pd_25Zr_55 Al_20 amorphous phase and the intermetallic crystalline phase Pd_11Zr_9 is associated with the differences of atomic radius, the proportion, and the melting point of different atoms, as well as the heat of mixing between atoms, leading to an equilibrium state of the two phases. Accordingly, a composite system with intertwined nanocrystals and amorphous phases is in turn formed, and improves the stability of the material.

关键词： Metallic glasses Radial distribution function Electron diffraction Density functional theory Formation mechanism

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