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Lead-free perovskites-based photonic synaptic devices with zero electric energy consumption

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Science China(Information Sciences) 2024年第6期67卷 433-441页

作者： Dandan HAO di yang Haixia LIANG Jia HUANG Fukai SHAN College of Electronics and Information Qingdao University Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences School of Materials Science and Engineering Tongji University National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji University

The von Neumann bottleneck is a critical limitation in synaptic devices. Therefore, artificial synaptic devices resembling biological neuromorphic synapses have been developed to overcome the von Neumann bottleneck. However, synaptic devices require voltages, which results in considerable energy consumption. Here, photonic synaptic devices with the vertical structure of indium tin oxide（ITO）/SnO2/Al2O3/CsBi3I10/Au are fabricated, which can work in the self-powered mode owing to the photovoltaic effect endowed by a vertical multilayer structure. Several fundamental synaptic functions, such as excitatory postsynaptic current, paired-pulse facilitation, short-term plasticity（STP）, long-term plasticity（LTP）, pulse-frequency-dependent plasticity, transition of STP to LTP, and the learning experience are emulated. Moreover, Morse-coded external light information is decoded by self-powered photonic synaptic devices. The results indicate that self-powered photonic synaptic devices based on lead-free perovskites exhibit great potential for efficient neuromorphic computing and optical wireless communication.

关键词： photonic synaptic devices lead-free perovskites zero energy consumption synaptic plasticity Morse code

Design strategy and comprehensive performance assessment towards Zn anode for alkaline rechargeable batteries

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Journal of Energy Chemistry 2023年第7期82卷 122-138,I0004页

作者： di yang Jinsheng Li Changpeng Liu Wei Xing Jianbing Zhu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied Chemistry and Engineering University of Science and Technology of Chin1 Hefei 230026AnhuiChina

Alkaline Zn-based primary batteries have been commercialized in the past ***,their success has not been extended to secondary batteries due to the poor cycle reversibility of Zn *** some research has been conducted on alkaline Zn anodes,their performance is still far from commercial requirements.A variety of degradation mechanisms,including passivation,dendrites,morphological changes,and hydrogen precipitation,are claimed responsible for the failure of alkaline Zn metal ***’s worse,these constraints always interact with each other,which leads to a single strategy being unable to suppress all the ***,a comprehensive evaluation of the positive and negative effects of various strategies on performance is important to promote the commercialization of alkaline Zn ***,the recent progress and performance of improvement strategies for Zn anode in alkaline conditions are reviewed ***,the principles and challenges of alkaline Zn anodes are briefly ***,various design strategies for alkaline Zn anodes from the perspectives of ion and electron regulation are ***,through a comprehensive summary of various performance parameters,the advantages and disadvantages of different strategies are compared and *** the basis of this assessment,we aim to provide more insights into the anode design of high-performance alkaline rechargeable Zn batteries.

关键词： Alkaline aqueous batteries Zinc anode Regulation strategies Performance assessment

A Spinor Approach to the SU(2) Clebsch-Gordan Coefficients

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Communications in Theoretical Physics 2019年第6期71卷 663-669页

作者： Ling-di yang Fa-Min Chen Department of Physics Beijing Jiaotong University

We review the irreducible representation of an angular momentum vector operator constructed in terms of spinor algebra. We generalize the idea of spinor approach to study the coupling of the eigenstates of two independent angular momentum vector operators. Utilizing the spinor algebra, we are able to develop a simple way for calculating the SU(2) Clebsch-Gordan(CG) coefficients. The explicit expression for the SU(2) CG coefficients is worked out, and some simple physical examples are presented to illustrate the spinor approach.

关键词： Clebsch-Gordan coefficients spinors representations

Triboelectric nanogenerator hybrid array driven by multiform natural energies and its applications in self-powered cathodic protection

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Science China(Technological Sciences) 2024年第3期67卷 878-890页

作者： SUN Weixiang yang di LUO Ning LI Hao WANG DaoAi School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratoryof Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

In view of the increasing energy shortage and environmental pollution, the collection of friction charges to achieve the conversion of various natural energies and provide in-situ cathodic protection for metals is a significant challenge. Here, we designed a dual device-structure TENG composite array with the triboelectric layer of linear siloxane-modified polyurethane(PU) coating. This array could achieve a comprehensive collection for multiple forms of nature energy and cathodic protection of metals in multi-weather conditions. For one thing, the wave-mode TENG based on tanker structure could collect wave energy and showed the output performance with a short-circuit current of 15.5 μA. For another thing, the droplet-mode TENG based on arc-shaped surface structure could collect raindrop kinetic energy and showed the output performance with a short-circuit current of 16.3 μA. Notably, the parallel array of wave-mode TENG(W-TENG) and droplet-mode TENG(D-TENG) could simultaneously collect wave energy and raindrop kinetic energy, which showed a short-circuit current of 30.7 μA. Besides, a selfpowered a cathodic protection system powered by the dual structure TENG array is assembled and the open-circuit potential drop of the carbon steel connected with the TENG array is about 450 mV. Compared with cathodic protection system powered by single structure TENG, the composite array could provide more effective corrosion resistance for marine equipment in rainy weather. Due to the characteristic for comprehensive collection of nature energy, the anti-corrosion system supplied by TENG parallel array possesses great application potential in the all-weather corrosion protection of metal machinery under complex marine conditions.

关键词： triboelectric nanogenerator hybrid structure array siloxane-modified polyurethane cathodic protection

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Study on the hot deformation behavior of Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot compression

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Acta Metallurgica Sinica(English Letters) 2009年第2期22卷 110-116页

作者： Gaoyong LIN Xiaoyan ZHENG Wei yang di FENG Dashu PENG School of Materials Science and Engineering Central South UniverSity Changsha 410083 China

The mechanical behavior and microstructures of an Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot deformation were investigated by thermal stimulation test, optical microscopy, and transmission electron microscopy. The true stress vs true strain curves and the microstructure evolution of two hot deformation procedures were gained. The flow stress of the alloy studied decreases with increasing the deforming passes and declining the temperature, and the larger the temperature decline between adjacent stages, the larger the peak stress fall is. The stress-strain behavior mainly result from the dynamic recovery during deformation, the static recovery and recrystallization in the delay time, and the second phases precipitated from the matrix at high temperature.

关键词： Al-Zn-Mg-Cu-Cr alloy Multi-stage compression Flow stress and peak stress Micro-structure evolution

Induced arousal following zolpidem treatment in a vegetative state after brain injury in 7 cases Analysis using visual single photon emission computerized tomography and digitized cerebral state monitor

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Neural Regeneration Research 2008年第1期3卷 94-96页

作者： Bo Du Aijun Shan di yang Wei Xiang Department of Neurosurgery Second Affiliated Hospital of Jinan University （Shenzhen People＇s Hospital） Shenzhen 518020 GuangdongProvince China

BACKGROUND： Several studies have reported the use of zolpidem for induced arousal after permanent vegetative states. However, changes in brain function and EMG after zolpidem treatment requires further investigation. OBJECTIVE： To investigate the effect of zolpidem, an unconventional drug, on inducing arousal in patients in a permanent vegetative state after brain injury using visual single photon emission computerized tomography and digitized cerebral state monitor. DESIGN： A self-controlled observation. SETTING： Shenzhen People＇s Hospital. PARTICIPANTS： Seven patients in a permanent vegetative state were selected from the Department of Neurosurgery, Shenzhen People＇s Hospital from March 2005 to May 2007. The group included 5 males and 2 females, 24-55 years of age, with a mean age of 38.5 years. All seven patients had been in a permanent vegetative statement for at least six months. The patient group included three comatose patients, who had sustained injuries to the cerebral cortex, basal ganglia, or thalamus in motor vehicle accidents, and four patients, who had suffered primary/secondary brain stem injury. Informed consents were obtained from the patients＇ relatives. METHODS： The patients brains were imaged by ^99Tc^m ECD single photon emission computerized tomography prior to treatment with zolpidem [Sanofi Winthrop Industrie, France, code number approved by the State Food ＆ Drug Administration （SFDA） J20040033, specification 10 mg per tablet. At 8：00 p.m., 10 mg zolpidem was dissolved with distilled water and administered through a nasogastric tube at 1 hour before and after treatment and 1 week following treatment, respectively. Visual analysis of cerebral perfusion changes in the injured brain regions before and after treatment was performed. Simultaneously, three monitoring parameters were obtained though a cerebral state monitor, which included cerebral state index, electromyographic index, and burst suppression index. MAIN OUTCOME MEASURES： Comparison of

关键词： brain injury controlled clinical trials coma

Chloride anion-induced dimer capsule based on a polyfluorinated macrocycle meta-WreathArene

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Chinese Chemical Letters 2023年第7期34卷 137-140页

作者： Shu Niu Hongyan Xiao Xiao-di yang Huan Cong Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistrySchool of Future Technology.University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBejing 100190 China Research Center of Chiral Drugs Innovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese MedicineShanghai 200438China

[1_n]metacyclophanes are a class of important building blocks for supramolecular assembly of artificial capsules. Herein we present the preparation and properties of a novel polyfluorinated macrocycle metaWreath Arene, a C_(2)-symmetrical [14]metacyclophane. Adopting a cone conformation in acetone solution,the macrocycle can form dimer capsules through hydrogen bonds induced by chloride anions. Each dimer capsule consists of two meta-Wreath Arene and two chloride anions, and has been unambiguously characterized both in solution and in solid state.

关键词： Macrocycle Metacyclophane Anion Assembly Capsule

Insights into the photocatalytic mechanism of the C4N/MoS2 heterostructure: A first-principle study

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Chinese Chemical Letters 2020年第9期31卷 2319-2324页

作者： Rui Zhang Wei Jian Zhao-di yang Fu-Quan Bai College of Chemical and Environmental Engineering Harbin University of Science and TechnologyHarbin 150080China Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry and College of ChemistryJilin UniversityChangchun 130023China Beijing National Laboratory for Molecular Sciences(BNLMS) Beijing 100190China

Constructing heterostructures by combining COFs and TMD is a new strategy to design efficient photocatalysts for CO2 reduction reaction(CO2RR) due to their good stability,tunable band gaps and efficient charge *** on the synthesis of completely novel C4N-COF in our previous re ported work,a new C4N/MoS2 heterostructure was constructed and then the related structural,electronic and optical properties were also studied using first principle *** interlayer coupling effect and charge transfer between the C4N and MoS2 layer are systematically *** reduced band gap of the C4N/MoS2 heterostructure is beneficial to absorb more visible *** the formation of type-Ⅱ band alignment,a built-in electric field appears which separates the photogene rated electrons and holes into different layers efficiently and produces redox active *** band alignment of the heterostructure ensures its photocatalytic activities of the whole CO2 reduction ***,the charge density difference and charge carrier mobility confirm the existence of the built-in electric field at the interface of the C4N/MoS2 heterostructure ***,the high optical absorption indicates it is an efficient visible light harvesting ***,this wo rk could provide strong insights into the internal mechanism and high photocatalytic activity of the C4N/MoS2 heterostructure and offer guiding of designing and synthesizing COF/TMD heterostructure photocatalysts.

关键词： First-principles calculations C4N/MoS2 heterostructure Electronic structure Built-in electric field Charge separation Photocatalyst

Optimized Fault Detection Algorithm Aided by BDS Baseband Signal for Train Positioning

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Chinese Journal of Electronics 2020年第1期29卷 34-40页

作者： WANG Ershen yang di WANG Chuanyun Huang Yufeng QU Pingping PANG Tao School of Electronic and Information Engineering Shenyang Aerospace University Liaoning General Aviation Key Laboratory Shenyang Aerospace University School of Computer Science and Engineering Shenyang Aerospace University

The satellite navigation integrity monitoring technology is closely related to the reliability of train positioning. It is of great significance to study satellite navigation Receiver autonomous integrity monitoring(RAIM) algorithm suitable for train positioning. Some existing conventional RAIM algorithms do not consider the influence of satellite navigation signal on algorithms *** at the influence of satellite navigation signal on the propagation processes, such as shadow and multipath effects, the fault detection algorithm based on BeiDou navigation satellite system(BDS) baseband signal is *** innovation parameters contained in the satellite navigation baseband signal are combined into the covariance matrix to set up a new test statistics of RAIM. A new fault detection algorithm based on optimized BDS baseband signal is discussed. And combined with weighted least square method, the noise power balance factor is established to realize satellite fault detection. Experimental results show that the proposed algorithm can improve the monitoring performance of train satellite positioning integrity, and lay the foundation for meeting the railway industry’s security requirements for positioning services.

关键词： BeiDou navigation satellite system(BDS) Train positioning Receiver autonomous integrity monitoring(RAIM) Baseband signal Fault detection(FD) Test statistics