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Journal of Semiconductors 2021年第8期42卷 66-72页

作者： Jianyun zhao Xu Li ting Liu Yong Lu Jicai Zhang College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Currently,the preparation of large-size and high-quality hexagonal boron nitride is still an urgent *** this study,we investigated the growth and diffusion of boron and nitrogen atoms on the sapphire/h-BN buffer layer by first-principles calculations based on density functional *** surface of the single buffer layer provides several metastable adsorption sites for free B and N atoms due to exothermic *** adsorption sites at the ideal growth point for B atoms have the lowest adsorption energy,but the N atoms are easily trapped by the N atoms on the surface to form N-N *** the increasing buffer layers,the adsorption process of free atoms on the surface changes from exothermic to *** diffusion rate of B atoms is much higher than that of the N atoms thus the B atoms play a major role in the formation of B-N *** introduction of buffer layers can effectively shield the negative effect of sapphire on the formation of B-N *** makes the crystal growth on the buffer layer tends to two-dimensional growth,beneficial to the uniform distribution of B and N *** findings provide an effective reference for the h-BN growth.

关键词： hexagonal boron nitride buffer layer first-principles calculations molecular dynamics

Integrated in-memory sensor and computing of artificial vision system based on reversible bonding transition-induced nitrogen-doped carbon quantum dots (N-CQDs)

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Nano Research 2024年第11期17卷 10049-10057页

作者： Tianqi yu Jie Li Wei Lei Suhaidi Shafe Mohd Nazim Mohtar Nattha Jindapetch Paphavee van Dommelen Zhiwei zhao Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and Engineering Southeast University Nanjing 210096 China Institute of Nanoscience and Nanotechnology University Putra Malaysia Serdang Selang 43400 Malaysia Department of Electrical Engineering Faculty of Engineering Prince of Songkla University Hat Yai Songkhla 90112 Thailand Division of Physical Science Faculty of Science Prince of Songkla University Hat Yai Campus 15 Karnjanavanich Hat Yai Kohong District Songkhla 90110 Thailand

Carbon quantum dots (CQDs) have been used in memristors due to their attractive optical and electronic properties, which are considered candidates for brain-inspired computing devices. In this work, the performance of CQDs-based memristors is improved by utilizing nitrogen-doping. In contrast, nitrogen-doped CQDs (N-CQDs)-based optoelectronic memristors can be driven with smaller programming voltages (−0.6 to 0.7 V) and exhibit lower powers (78 nW/0.29 µW). The physical mechanism can be attributed to the reversible transition between C–N and C=N with lower binding energy induced by the electric field and the generation of photogenerated carriers by ultraviolet light irradiation, which adjusts the conductivity of the initial N-CQDs to implement resistance switching. Importantly, the convolutional image processing based on various cross kernels is efficiently demonstrated by stable multi-level storage properties. An N-CQDs-based optoelectronic reservoir computing implements impressively high accuracy in both no noise and various noise modes when recognizing the Modified National Institute of Standards and Technology (MNIST) dataset. It illustrates that N-CQDs-based memristors provide a novel strategy for developing artificial vision system with integrated in-memory sensor and computing.

关键词： nitrogen-doped carbon quantum dots(N-CQDs) optoelectronic memristor reversible bonding transition convolutional image processing reservoir computing

Ozonation as an efficient pretreatment method to alleviate reverse osmosis membrane fouling caused by complexes of humic acid and calcium ion

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 89-100页

作者： Xuehao zhao Yinhu Wu Xue Zhang Xin Tong Tong yu yunhong Wang Nozomu Ikuno Kazuki Ishii Hongying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China Collaborative Innovation Center for Advanced Nuclear Energy Technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China Kurita Water Industries Ltd. Nakano-kuTokyo 164-0001Japan Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

Humic acid has been considered as one of the most significant sources in feed water causing organic fouling of reverse osmosis (RO) membranes, but the relationship between the fouling behavior of humic acid and the change of its molecular structure has not been well developed yet. In this study, the RO membrane fouling behavior of humic acid was studied systematically with ozonation as a pretreatment method to control RO membrane fouling. Furthermore, the effect of ozone on the structure ofhumic acid was also explored to reveal the mechanisms. Humic acid alone (10-90 mg/L, in deionized water) was found not to cause obvious RO membrane fouling in 45-h operation. However, the presence of Ca^2+ aggravated significantly the RO membrane fouling caused by humic acid, with significant flux reduction and denser fouling layer on RO membrane, as it was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). However, after the pretreatment by ozone, the influence of Ca^2+ was almost eliminated. Further analysis revealed that the addition of Ca^2+ increased the particle size of humic acid solution significantly, while ozonation reduced the SUVA254, particle size and molecular weight of the complexes of humic acid and Ca^2+(HA-Ca^2+ complexes). According to these results and literature, the bridge effect of Ca^2+ aggregating humic acid molecules and the cleavage effect of ozone breaking HA-Ca^2+ complexes were summarized. The change of the structure of humic acid under the effect of Ca^2+ and ozone is closely related to the change of its membrane fouling behavior.

关键词： Reverse osmosis Membrane fouling Humic acid Ca^2+ Ozone

Influence of Chromatin 3D Organization on Structural Variations of the Arabidopsis thaliana Genome

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Molecular Plant 2017年第2期10卷 340-344页

作者： Tao, Jing-Fen Zhou, Jin-Zhi Xie, ting Wang, Xiao-Tao Yang, Qing-Yong Zhang, Hong-yu Huazhong Agr Univ Hubei Key Lab Agr Bioinformat Coll Informat Wuhan 430070 Hubei Peoples R China Huazhong Agr Univ Natl Key Lab Crop Genet Improvement Wuhan 430070 Hubei Peoples R China

Dear Editor The spectrum of genetic variations ranges from single nucleotide polymorphisms （SNPs） to large-scale structural variants （SVs）. Genome SVs involving kilobase- to megabase-sized insertions, deletions, duplications, and inversions, as well as complex com- binations of rearrangements, are common during evolution in various species （Feuk et al., 2006; Saxena et al., 2014）. A larger fraction of the human genome is affected by SVs than SNPs,

关键词： Chromatin Structural Genome

Large eddy simulations of zinc ions transfer to turbulent flows from hyporheic zone

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Journal of Hydrodynamics 2024年第4期36卷 650-661页

作者： Yi-ming Jin Jin-feng Chen Jin-long Zhang Ze-hao zhao Dong-liang Fan yu-hong Dong Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai Frontier Science Center of MechanoinformaticsShanghai UniversityShanghai200072China Shanghai Institute of Aircraft Mechanics and Control Shanghai200092China

Metal contaminants from surface water pollution events often enter hyporheic zones,under certain conditions,they may be released back into streams,causing secondary pollution to the water *** present study investigated the effects of adsorption,permeability,and anisotropy of sediment beds on the release of zinc ions(Zn^(2+))from the hyporheic zone into overlying turbulent flows using large-eddy simulations(LES).The volume-averaged Navier-Stokes equations and advection-diffusion equation with adsorption term were used to describe the sediment in-flow,adsorption,and convective diffusion of Zn^(2+) within the sediment *** effects of sediment permeability on the Zn^(2+)concentration distribution and mass transfer processes were investigated by time-averaged statistics of flow and concentration *** results show that adsorption becomes stronger as the pH value increases,leading to a slow increase in Zn^(2+)concentration in the overlying water layer and reaching a lower steady-state *** overall permeability of the sediment layer can enhance mass and momentum exchange near the sediment-water interface(SWI),and intensify the release of Zn^(2+)from the sediment layer into the overlying *** the wall-normal permeability of the sediment layer increases,the normal turbulent intensity strengthens,momentum transport enhances,the wall-normal Zn^(2+)concentration flux increases,the effective diffusion coefficient increases,and the concentration in the overlying water increases.

关键词： Zn^(2+)contaminants adsorption hyporheic exchange turbulent flow large eddy simulation(LES)

Metal oxide ion gated transistors based sensors

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Science China(Technological Sciences) 2024年第4期67卷 1040-1060页

作者： LI Yang YAO yu WANG LeLe WANG LiWei PANG yunCong LUO ZhongZhong ARUNPRABAHARAN Subramanian LIU ShuJuan zhao Qiang College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NJUPT)Nanjing 210023China State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&Telecommunications(NJUPT)Nanjing 210023China Department of Chemical Engineering Polytechnique MontréalMontréalQuébec H3C3J7Canada

Metal oxide ion-gated transistors(MOIGTs)have garnered significant attention within the sensing domain due to their potential for achieving heightened sensitivity while consuming minimal energy across diverse *** harnessing the advantageous combination of metal oxides'high carrier mobility and facile surface customization,coupled with the potent signal amplification capabilities of ion-gated transistors,MOIGTs offer a promising avenue for discerning biomolecules,overseeing chemical reactions,p H levels,as well as facilitating gas or light *** the past few decades,the MOIGT field has made remarkable strides in refining device physics,enhancing material properties,showcasing robust sensing capabilities,and broadening its application *** advancements have simultaneously unveiled new challenges and opportunities,necessitating interdisciplinary expertise to fully unlock the commercial potential of *** this comprehensive review,we offer a snapshot of this swiftly evolving technology,delve into its current applications,and provide insightful recommendations for future directions in the coming decade.

关键词： sensors ion gated transistors metal oxide semiconductors biosensors chemosensors pH sensors

Direct-writing Structure Color Patterns on the Electrospun Colloidal Fibers toward Wearable Materials

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Chinese Journal of Polymer Science 2019年第8期37卷 729-736页

作者： Shu-Jian yuan Wei-Hao Meng Ai-Hua Du Xin-yu Cao Yong zhao Jing-Xia Wang Lei Jiang Key Laboratory of Rubber-plastics Ministry of Education Qingdao University of Science & Technology Qingdao 266042 China CAS Key Laboratory of Bio-inspired Materials and Interfacial Sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China School of Opticelectronic School of Future Technologies University of Chinese Academy of Sciences Beijing 101407 China Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100191 China

This study presents a direct-writing structure color patterns on electrospun colloidal fibers by inkjet printing. The colloidal fiber was obtained by electrospinning the aqueous mixture of colloidal particles of poly(styrene-methyl methacrylate-acrylic acid) and poly(vinyl alcohol). The pattern was obtained by directly inkjet printing water onto the electrospun colloidal fiber. The pattern formation was attributed to the morphological transition of the colloidal fiber from the fiber aggregation to latex aggregation and the corresponding color change due to the dissolution of poly(vinyl alcohol) by water. Interestingly, a clear and clean image was successfully obtained on the ethanol-treated colloidal fibers film in comparison to a confused and blur image onto the freshly-made film. It is because the treatment process can compact the fiber structure and lower the spreading/wetting behavior of ink on the fiber structure, contributing to the formation of high-quality pattern. Various letters or quick response code were flexibly designed and printed on to colloidal ***, the pattern can be easily transferred onto flexible substrate, i.e., a flexible printed bracelet. This work will be of great significance for the development of novel wearable functional materials/devices based on electrospun colloidal fibers.

关键词： Electrospinning Colloidal fiber Pattern Inkjet printing Structure color

Rock physical characteristics of deep dolomite under complex geological conditions:A case study of 4th Member of Sinian Dengying Formation in the Sichuan Basin,China

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Petroleum Science 2024年第4期21卷 2370-2382页

作者： Chuang Li Shu-Xin Pan Hong-Bin Wang Ji-Xin Deng Jian-Guo zhao Zhi Li yu Zhang Northwest Branch of Research Institute of Petroleum Exploration&Development Lanzhou730020GansuChina State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China Department of Geophysics and Exploration College of GeophysicsChengdu University of TechnologyChengdu610059SichuanChina

The deep-ultra deep carbonate reservoir in China,commonly subjected to modification of multi-stage diagenesis,has extremely high *** rock physics analysis cannot accurately identify the elastic responses of ***,the rock physics properties of the dolomite from the 4th Member of the Sinian Dengying Formation are experimentally measured,and the change law of rock physics characteristics is investigated within the framework of the diagenetic processes by the analysis of the elastic and petrologic characteristics,pore structure,and sedimentary *** results show that the differentiated diagenesis results in different pore structure characteristics and microtexture characteristics of the *** microbial dolomite of the algal mound-grain beach facies is subjected to the contemporaneous microbial dolomitization and seepage-reflux dolomitization,penecontemporaneous selective dissolution,burial dolomitization,and hydrothermal *** resultant crystalline dolomite is found with one main type of the dolomite crystal contact boundaries,and the dissolution pore is extensive *** siliceous,muddy,and limy dolomite of the interbeach sea environment mainly experiences the weak capillary concentration dolomitization,intensive mechanical compaction-induced densification,and burial *** crystalline dolomite is observed with four types of contact boundaries,namely the dolomite contact,clay contact,quartz contact,and calcite contact boundaries,and porosity mostly attributed to residual primary inter-granular or crystalline *** samples with the same crystal boundary condition have consistent correlations between the compressional-and shear-wave velocities,and between the compressional-wave velocity and the velocity ***,the variation of the acoustic velocity with effective pressure and the intensity of pore-scale fluid-related dispersion are controlled by the differentiation of pore st

关键词： Deep-ultra deep carbonate reservoirs Rock physics properties Dolomite Seismic elastic properties Micro-crack Pore structure types

Heterogeneity and clinical genomics of bla_(KPC-2)-producing,carbapenem-resistant Pseudomonas aeruginosa

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hLife 2024年第6期2卷 314-319页

作者： Man Huang Lizhang Liu Xiaoxia Li yu Shi Huimin Zhang ting Lu Youjun Feng Key Laboratory of Multiple Organ Failure Ministry of EducationDepartments of Microbiology and General Intensive Care Unit of the Second Affiliated HospitalZhejiang University School of MedicineZhejiangChina Zhejiang Provincial Key Laboratory for Microbial Biochemistry and Metabolic Engineering ZhejiangChina Cancer Center at Illinois University of Illinois at Urbana-ChampaignIllinoisUSA Department of Bioengineering University of Illinois at Urbana-ChampaignIllinoisUSA

Antimicrobial resistance(AMR)is one of the top global challenges of public health *** 2019,it was estimated that AMR claimed around 5 million deaths worldwide[1].Pseudomonas aeruginosa,which originated in soil and water,is recognized as an opportunistic pathogen causing recalcitrant infec***-resistant ***(CRPA)is listed by the World Health Organization(WHO)as an important member of top priority“ESKAPE”*** is largely supported by the fact that in 2020,CRPA had caused28,8000 nosocomial infections with about 2500 *** from porin mutations,the acquisition of Klebsiella pneumoniae carbapenemase(termed as KPC-2)constitutes an alternative mechanism for carbapenem resistance in ***,which compromises the clinical efficacy of the carbapenem as a“last resort”***,the transferability of blaKPC-2 determinants facilitates global dissemination of CRPA in the context of“one health”consisting of humans,animals,plants/crops,and environmental set*** addition to antimicrobial stewardship,coordinated global action is necessary to mitigate AMR progression.

关键词： KPC resistant resort

The resistance switching performance of the memristor improved effectively by inserting carbon quantum dots(CQDs)for digital information processing

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Nano Research 2024年第9期17卷 8438-8446页

作者： Tianqi yu Jie Li Wei Lei Suhaidi Shafe Mohd Nazim Mohtar Nattha Jindapetch Paphavee van Dommelen Zhiwei zhao Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China Institute of Nanoscience and Nanotechnology University Putra MalaysiaSerdangSelangor 43400Malaysia Department of Electrical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90112Thailand Division of Physical Science Faculty of SciencePrince of Songkla UniversityHat Yai Campus 15 KarnjanavanichHat YaiSongkhla 90110Thailand

As an emerging information device that adapts to development of the big data era,memristor has attracted much attention due to its advantage in processing massive ***,the nucleation and growth of conductive filaments often exhibit randomness and instability,which undoubtedly leads to a wide and discrete range of switching parameters,damaging the electrical performance of *** this work,a strategy of inserting carbon quantum dots(CQDs)into graphene oxide(GO)resistance layer is utilized to improve the stability of the switching parameters and the reliability of the device is *** with GO-based devices,GO/CQDs/GO-based devices exhibit a more stable resistance switching curve,low power,lower and more concentrated threshold voltage parameters with lower variation coefficient,faster switching speed,and more stable retention and *** cause-inducing performance improvement may be attributed to the local electric field generated by CQDs in resistance switching that effectively guides the formation and rupture of conductive filaments,which optimizes the effective migration distance of Ag^(+),thereby improving the uniformity of resistance ***,a convolutional neural network model is constructed to identify the CIFAR-10 data set,showing the high recognition accuracy of online and offline *** cross-kernel structure is used to further implement convolutional image processing through multiplication and accumulation *** work provides a solution to improve the performance of memristors,which can contribute to developing digital information processing.

关键词： carbon quantum dots memristor uniformity convolutional neural network convolutional image processing