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Preparation of MXene-based hybrids and their application in neuromorphic devices

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International Journal of Extreme Manufacturing 2024年第2期6卷 164-188页

作者： Zhuohao Xiao Xiaodong Xiao Ling Bing Kong Hongbo Dong Xiuying Li Bin He shuangchen ruan Jianpang Zhai Kun Zhou qin Huang Liang Chu school of Materials science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403JiangxiPeople’s Republic of China school of Mechanical and Vehicle Engineering Linyi UniversityLinyi 276000ShandongPeople’s Republic of China college of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118GuangdongPeople’s Republic of China school of Mechanical&Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Ningbo Institute of Materials Engineering and Technology Chinese Academy of ScienceNingbo 315201ZhejiangPeople’s Republic of China Institute of Carbon Neutrality and New Energy&school of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018ZhejiangPeople’s Republic of China

The traditional von Neumann computing architecture has relatively-low information processing speed and high power consumption,making it difficult to meet the computing needs of artificial intelligence(AI).Neuromorphic computing systems,with massively parallel computing capability and low power consumption,have been considered as an ideal option for data storage and AI computing in the ***,as the fourth basic electronic component besides resistance,capacitance and inductance,is one of the most competitive candidates for neuromorphic computing systems benefiting from the simple structure,continuously adjustable conductivity state,ultra-low power consumption,high switching speed and compatibility with existing CMOs *** memristors with applying MXene-based hybrids have attracted significant attention in recent ***,we introduce the latest progress in the synthesis of MXene-based hybrids and summarize their potential applications in memristor devices and neuromorphological *** explore the development trend of memristors constructed by combining MXenes with other functional materials and emphatically discuss the potential mechanism of MXenes-based memristor ***,the future prospects and directions of MXene-based memristors are briefly described.

关键词： MXene etching fabrication memristor neuromorphic

Theoretical study of the mechanism for C-H bond activation in spin-forbidden reaction between Ti^+ and C_2H_4

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science China chemistry 2009年第3期52卷 295-303页

作者： LV LingLing1, LIU XinWen1, YUAN Kun1, WANG XiaoFang1 & WANG YongCheng2 1 college of life science and chemistry, Tianshui Normal University, Tianshui 741001, China 2 college of chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China college of life science and chemistry Tianshui Normal University Tianshui 741001 China college of chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China

The mechanism of the spin-forbidden reaction Ti+(4F, 3d2.s1) + C2H4 → TiC2H2+ (2A2) + H2 on both doublet and quartet potential energy surfaces has been investigated at the B3LYP level of theory. Crossing points between the potential energy surfaces and the possible spin inversion process are discussed by means of spin-orbit coupling (sOC) calculations. The strength of the sOC between the low-lying quartet state and the doublet state is 59.3 cm-1 in the intermediate complex IM1-4B2. Thus, the changes of its spin multiplicity may occur from the quartet to the doublet surface to form IM1- 2A1, leading to a sig-nificant decrease in the barrier height on the quartet PEs. After the insertion intermediate IM2, two dis-tinct reaction paths on the doublet PEs have been found, i.e., a stepwise path and a concerted path. The latter is found to be the lowest energy path on the doublet PEs to exothermic TiC2H2+ (2A2) + H2 products, with the active barrier of 4.52 kcal/mol. In other words, this reaction proceeds in the following way: Ti++C2H4 →4IC→IM1-4B2→4,2.sC→IM1- 2A1→[2.sins]→IM2→[2.sMCTs]→IM5→TiC2H2+(2A2)+H2.

关键词： Ti+(4F) and C2H4 spin-forbidden reaction mechanism spin-orbit coupling (sOC) concerted path

A New Triterpenoid saponin: se-saponin A

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Chinese Chemical Letters 2000年第4期11卷 333-336页

作者： Hui YANG~(1,2) qin MU~1 Yi Neng HE~1 Han Dong sUN~1 (1Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of sciences. Kunming 650204 (2chemistry Department, college of life science and chemistry, Yunnan University, Kunming 650091) Chinese Acad sci Kunming Inst Bot Lab Phytochem Kunming 650204 Peoples R China Yunnan Univ Coll Life Sci & Chem Dept Chem Kunming 650091 Peoples R China

A new triterpenoid saponin, se-saponin A, was isolated from the aerial parts of Clerodendrum serratum var. amplexifolium Moldenke. Its structure was determined by spectral and chemical methods. Only one triterpenoid s... 详细信息

关键词： Clerodendrum serratum Verbenaceae triterpenoid saponin se-saponin A

study on the drug resistance and the binding mode of HIV-1 integrase with LCA inhibitor

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science China chemistry 2007年第5期50卷 665-674页

作者： HU JianPing1,2, CHANG shan1, CHEN WeiZu1 & WANG CunXin1 1 college of life science and Bioengineering, Beijing University of Technology, Beijing 100022, China 2 Department of chemistry & life sciences, Leshan Normal University, Leshan 614004, China college of life science and Bioengineering Beijing University ofTechnologyBeijing 100022China Department of chemistry & life sciences Leshan NormalUniversityLeshan 614004China

Human immunodeficiency virus type 1 (HIV-1) integrase (IN) is an essential enzyme in the lifecycle of this virus and also an important target for the study of anti-HIV drugs. The binding mode of the wild type IN core domain and its G140s mutant with L-Chicoric acid (LCA) inhibitor were investigated by using multiple conformation molecular docking and molecular dynamics (MD) simulation. Based on the binding modes, the drug resistance mechanism was explored for the G140s mutant of IN with LCA. The results indicate that the binding site of the G140s mutant of IN core domain with LCA is different from that of the core domain of the wild type IN, which leads to the partial loss of inhibition potency of LCA. The flexibility of the IN functional loop region and the interactions between Mg2+ ion and the three key residues (i.e., D64, D116, E152) stimulate the biological operation of IN. The drug resistance also lies in several other important effects, such as the repulsion between LCA and E152 in the G140s mutant core domain, the weakening of K159 binding with LCA and Y143 pointing to the pocket of the G140s mutant. All of the above simulation results agree well with experimental data, which provide us with some helpful information for designing the drug of anti-HIV based on the structure of IN.

关键词： molecular docking, MD simulation, HIV-1 IN, drug design

The toxicity of Cu^(2+) to Microcystis aeruginosa using dielectric spectroscopy

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science China chemistry 2010年第3期53卷 631-636页

作者： YU YanLi1,BAI Wei1,ZHAO Kongshuang1& ZHOU YunLong2 1college of chemistry,Beijing Normal University,Beijing 100875,China 2college of life science,Beijing Normal University,Beijing 100875,China 1. college of chemistry Beijing Normal University Beijing 100875 China2. College of Life Science Beijing Normal University Beijing 100875 China

Dielectric spectroscopy(Ds) was utilized to investigate the toxicity of the Cu2+ solution to Microcystis *** was found that 0.04 mM Cu2+ had no effect on dielectric increment,whereas the Cu2+ concentrations above 0.1 mM decreased the value of Δε/Δε *** toxic effect of Cu2+ on *** cells was time-dependent and *** was a threshold concentration between 0.04 mM and 0.1 mM,which affected the cell membrane,suggesting that Cu2+ at the concentrations higher than 0.1 mM caused serious plasmalemma damage to *** *** addition of 1 mM Ca2+ or Mg2+ did not protect *** cells from 1 mM Cu2+ *** study demonstrates that Ds monitors cell biomass facilitating observation of the toxic effects of metal ions.

关键词： Microcystis aeruginosa dielectric spectroscopy dielectric increment cupric ion toxicity

Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures

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International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang Liu Wei Xu Xiaoxi Li Tongyao Zhang Chengbing qin Fang Luo Zhihong Zhu shiqiao qin Mengjian Zhu Kostya s Novoselov college of Advanced Interdisciplinary studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials science and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and *** record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals ***,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional ***,we demonstrate ultrafast thermal light emitters based on suspended graphene/hexagonal boron nitride(Gr/hBN)*** in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral *** eliminating the heat dissipation channel of the substrate,the radiation efficiency of the suspended Gr/hBN device is about two orders of magnitude greater than that of graphene devices supported on siO2or *** demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal *** cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical *** is found thatsuspending the Gr/hBN heterostructures on the siO2trenches significantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal *** demonstration of electrically driven ultrafast light emission from suspended Gr/hBNheterostructures sheds the light on applications of graphene heterostructures in photonicintegrated circuits,such as broadband light sources and ultrafast thermo-optic phase modulat

关键词： suspended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

Influence of MnO_2 on the photocatalytic activity of P-25 TiO_2 in the degradation of methyl orange

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中国科学：化学英文版 2008年第2期51卷 179-185页

作者： LI shunJun1, MA ZiChuan1,2, WANG Lin1 & LIU JingZe2 1 college of chemistry and Material sciences, Hebei Normal University, shijiazhuang 050016, China 2 college of life science, Hebei Normal University, shijiazhuang 050016, China college of chemistry and Material sciences Hebej Normal UniversityShijiazhuang 050016China college of life science Hebei Normal UniversityShijiazhuang 050016China

Influences of α-MnO2, β-MnO2, and δ-MnO2 on the photocatalytic activity of Degussa P-25 TiO2 have been investigated through the photocatalytic degradation of methyl orange. The TiO2 photocatalyst, before and after being contaminated by MnO2, was characterized by UV-visible diffuse reflectance spectroscopy (UV-vis DRs), photoluminescence (PL), and X-ray photoelectron spectroscopy (XPs). The results showed that photocatalytic activity of TiO2 could be inhibited significantly or completely deactivated due to the presence of even a small amount of MnO2 particles. It was found that the poisoning effect varied with the crystal phases of MnO2 and the effect was in the order δ-MnO2 >α-MnO2 >β-MnO2. The poisoning effect was attributed to the formation of heterojunctions between MnO2 and TiO2 particles. The heterojunctions changed the chemical state of Ti4+ and O2.sites in the crystalline phase of TiO2. MnO2 in contact with TiO2 particles also broadens the band-gap of TiO2, which decreases UV absorption of TiO2. It can also create some deep impurity energy levels serving as photoelec-tron-photohole recombination center, which accelerates the electron-hole recombination.

关键词： TiO2 MnO2 deactivation photocatalysis methyl orange

A New Phenylpropanoid Glycoside: serratumoside A from Clerodendrum serratum

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Chinese Chemical Letters 2000年第4期11卷 323-326页

作者： Hui YANG~(1,2) Ai Jun HOU~1 shuang xi MEI~1 Li Yan PENG~ Han Dong sUN~1 (1 Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of sciences, Kunming 650204) 2chemistry Department, college of life science and chemistry, Yunnan Unive Chinese Acad sci Kunming Inst Bot Lab Phytochem Kunming 650204 Peoples R China Yunnan Univ Coll Life Sci & Chem Dept Chem Kunming 650091 Peoples R China

A new phenylpropanoid glycoside, serratumoside A, was isolated from the aerial parts of Clerodendrum serratum var. amplexifolium Moldenke. Its structure was determined by spectral and chemical methods.

关键词： Clerodendrum serratum Verbenaceae phenylpropanoid glycoside serratumoside A

Enhancing source domain availability through data and feature transfer learning for building power load forecasting

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Building simulation 2024年第4期17卷 625-638页

作者： Fanyue Qian Yingjun ruan Huiming Lu Hua Meng Tingting Xu college of Mechanical and Energy Engineering Tongji UniversityShanghai200092China United Automotive Electronic systems Co. LtdShanghai201206China

During the initial phases of operation following the construction or renovation of existing buildings,the availability of historical power usage data is limited,which leads to lower accuracy in load forecasting and hinders normal ***,by transferring load data from similar buildings,it is possible to enhance forecasting ***,indiscriminately expanding all source domain data to the target domain is highly likely to result in negative transfer *** study explores the feasibility of utilizing similar buildings(source domains)in transfer learning by implementing and comparing two distinct forms of multi-source transfer ***,this study focuses on the Higashita area in Kitakyushu City,Japan,as the research *** buildings that exhibit the highest similarity to the target buildings within this area were selected for ***,the two-stage TrAdaBoost.R^(2) algorithm is used for multi-source transfer learning,and its transfer effect is ***,the application effects of instance-based(IBMTL)and feature-based(FBMTL)multi-source transfer learning are compared,which explained the effect of the source domain data on the forecasting accuracy in different transfer *** results show that combining the two-stage TrAdaBoost.R^(2) algorithm with multi-source data can reduce the CV-RMsE by 7.23%compared to a single-source domain,and the accuracy improvement is *** the same time,multi-source transfer learning,which is based on instance,can better supplement the integrity of the target domain data and has a higher forecasting ***,IBMTL tends to retain effective data associations and FBMTL shows higher forecasting *** findings of this study,which include the verification of real-life algorithm application and source domain availability,can serve as a theoretical reference for implementing transfer learning in load forecasting.

关键词： building power load multi-source transfer learning two-stage TrAdaBoost.R2 source domain availability