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Memristive feature and mechanism induced by laser-doping in defect-free 2D semiconductor materials

Journal of Semiconductors 2024年第7期45卷 85-91页

作者： Xiaoshan du Shu Wang Qiaoxuan Zhang Shengyao Chen Fengyou Yang Zhenzhou Liu Zhengwei Fan Lijun Ma lei Wang Lena du Zhongchang Wang Cong Wang Bing Chen Qian Liu College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao 266590China National Center for Nanoscience and Technology&University of Chinese Academy of Sciences Beijing 100190China Hebei University of Water Resources and Electric Engineering Electrical Automation Department Cangzhou 061001China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Re-search Center on Liquid Crystal Pho-tonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China College of Mathematics and Physics Shandong Advanced Optoelectronic Materials and Technologies Engineering LaboratoryQingdao Uni-versity of Science and TechnologyQingdao 266061China Department of Physics Capital Normal UniversityBeijing 100048China Department of Advanced Materials and Computing International Iberian Nanotechnology Laboratory(INL)4715-330 BragaPortugal College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Memristors as non-volatile memory devices have gained numerous attentions owing to their advantages in storage,in-memory computing, synaptic applications, etc. In recent years, two-dimensional(2D) materials with moderate defects have been discovered to exist memristive feature. However, it is very difficult to obtain moderate defect degree in 2D materials, and studied on modulation means and mechanism becomes urgent and essential. In this work, we realized memristive feature with a bipolar switching and a configurable on/off ratio in a two-terminal MoS_(2) device(on/off ratio ~100), for the first time, from absent to present using laser-modulation to few-layer defect-free MoS_(2)(about 10 layers), and its retention time in both high resistance state and low resistance state can reach 2×10^(4) s. The mechanism of the laser-induced memristive feature has been cleared by dynamic Monte Carlo simulations and first-principles calculations. Furthermore, we verified the universality of the laser-modulation by investigating other 2D materials of TMDs. Our work will open a route to modulate and optimize the performance of 2D semiconductor memristive devices.

关键词： 2D-material memristor laser doping laser direct writing memristive mechanism

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Effect of Low-temperature Imidization on Properties and Aggregation Structures of Polyimide Films with Different Rigidity

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Chinese Journal of Polymer Science 2024年第8期42卷 1134-1146页

作者： Yan Jia lei Zhai Song Mo Yi Liu Li-Xin Liu Xin-Yu du Min-Hui He Lin Fan Key Laboratory of Science and Technology on High-tech Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

The traditional high-temperature preparation process of polyimide can cause many problems and limits the wider application in extreme *** important challenge to be solved urgently is the reduction of imidization *** this work,twelve kinds of polyimide films with different chain rigidity were prepared at low temperature of 200℃,in the absence or presence of imidazole used as the *** molecular rigidity and free volume were theoretically calculated,and relationship between structure and properties were systematically *** results show that imidization reaction under low temperatures is significantly affected by the rigidity of molecula r *** rigid structure of polyimide is not conducive to the low-temperature imidization,but this adverse effect can be eliminated by adding catalyst,resulting the notably increased imidization *** optical and thermal properties can be improved to a certain extent for the chemically catalyzed system,resulting in relatively higher heat resistance and thermal *** the mechanical performance could be determined by com plicating factors,greatly different from polyimide films prepa red by high temperature *** investigate aggregation structures of film s,the effect of chain rigidity and catalyst on the stacking or orientation of molecular chains was further *** wo rk can contribute to the understanding of chemically catalyzed imidization that is rarely reported in the existing research,and will provide guidance for the low-temperature preparation of high-performance polyimides.

关键词： Polyimide Imidization Catalyst Structure and properties Aggregation structures

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Multi-performance evaluation of high-throughput accelerated corrosion test for high-strength low-alloy 921A steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1260-1278页

作者： Cong-cong du Ming-hua Qin Zhan-fang Wu Dong-ling Li lei Zhao Xiang-yang Li Hai-zhou Wang Beijing Advanced Innovation Center for Materials Genome Engineering National Center for Materials Service SafetyUniversity of Science and Technology BeijingBeijing100083China China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China Beijing Advanced Innovation Center for Materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China

The corrosion behavior of high-strength low-alloy 921A steel in a simulated marine atmospheric environment was studied using a high-throughput experimental *** corrosion behavior,corrosion morphology,and corrosion products of 921A steels were analyzed using various techniques,including corrosion mass loss method,polarization curve,white-light interferometry,scanning electron microscopy,energy-dispersive spectrometry,microbeam X-ray fluorescence spectrometry,X-ray diffraction technique,and X-ray photoelectron *** test results indicated that 921A steel exhibits better corrosion resistance than Q450NQR1 steel in simulated harsh atmospheric environments,as evidenced by a lower corrosion mass loss rate throughout the corrosion *** corrosion products of both steels consisted ofα-FeOOH,Fe_(3)O_(4),andγ-FeOOH,withα-FeOOH being more prevalent in the rust layer of 921A steel than in Q450NQR1 *** inner rust layer of 921A steel also exhibited an appositional enrichment region of Cr,Ni,Mo,and V,leading to its superior corrosion resistance compared to that of Q450NQR1 *** efficacy of high-throughput accelerated corrosion experimental methods was highlighted for evaluating the corrosion resistance of steel materials in harsh environmental *** findings suggest that 921A steel exhibits better corrosion resistance compared to Q450NQR1 steel and has the potential to be more suitable in harsh marine atmospheric *** characterization of the rust layer structures and composition reveals the parallel enrichment of certain elements in the inner rust layer of 921A steel,which enhances its corrosion resistance.

关键词： Atmospheric corrosion High-throughput experimental method High-strength low-alloy steel Corrosion characteristics Rust layer Element enrichment

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Persistent greening against drying in northeast Asian semiarid grasslands:Asymmetrical responses of direct and legacy effects to intensified drought

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Advances in Climate Change Research 2024年第1期15卷 9-20页

作者： Yu-Tong MA Hai-Shan CHEN Yao-Ming SONG Bo-Tao ZHOU Shan-lei SUN Xin-Guan du Yue SUN Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China

Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to ***,the mechanism behind this phenomenon remains ***,we analysed the interdecadal changes in vegetation response to drought on the basis of the standardised precipitation evapotranspiration index(SPEI)and Global Inventory Modelling and Mapping Studies LAI4g datasets,with an emphasis on the differences between direct and legacy effects(as measured by resilience),to explore the mechanism of persistent grassland *** revealed that during the post-drought shift period(2000-2020),the sudden decrease in the water content of the intermediate soil layer triggered an intensified vegetation response to ***,although direct effects and resilience were amplified,they exhibited asymmetric *** was stronger than direct effects,and this difference increased with increasing drought(drought recovery)*** combined effects may account for persistent greening against intensified drying in the semiarid grasslands in *** the projected exacerbation of future droughts,this study holds notable importance for comprehending the long-term change dynamics of dryland ecosystems.

关键词： Semiarid grassland Drought decadal shift Direct effect Legacy effect(resilience) Northeast Asia

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Palmitoleic acid on top of HFD ameliorates insulin resistance independent of diacylglycerols and alters gut microbiota in C57BL/6J mice

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Food Science and Human Wellness 2024年第2期13卷 856-868页

作者： Qijian Liang Yan Zheng Fanli Meng Xiaofan Jiang Qingcai Zhen Zhongting Lu Shixiu Zhang lei du Hao Wu Xin Guo Department of Nutrition and Food Hygiene School of Public HealthCheeloo College of MedicineShandong UniversityJinan 250012China Research Center of Translational Medicine Jinan Central Hospital Affiliated to Shandong First Medical UniversityJinan 250013China Department of Hepatology Qilu Hospital of Shandong UniversityJinan 250012China Institute of Hepatology Shandong UniversityJinan 250012China

With the prevalence of obesity and obesity-related metabolic syndrome,such as insulin resistance in recent years,it is urgent to explore effective interventions to prevent the progression of obesity-related metabolic *** acid is a monounsaturated fatty acid that is available from dietary sources,mainly derived from marine products.P almitoleic acid plays a positive role in maintaining glucose homeostasis and reducing ***,it is still unknow the mechanism of palmitoleic acid in ameliorating insulin ***,we investigated the effects of palmitoleic acid on chow diet(CD)-fed and high-fat diet(HFD)-fed mice,which were fed CD or HFD for 12 weeks before *** administrated mice with BSA(control),oleic acid,or palmitoleic acid for 6 weeks on top of CD or HFD *** found that palmitoleic acid only improved glucose homeostasis in HFD-fed obese mice by increasing glucose clearance and reducing *** study explored that palmitoleic acid changed the composition of gut microbiota by decreasing Firmicutes population and increasing Bacteroidetes *** colon,palmitoleic acid increased intestinal tight junction integrity and reduced ***,palmitoleic acid decreased macrophage infiltration in liver and adipose tissue and increase glucose uptake in adipose ***(DAG)in tissue(for example,liver)is found to positively correlated with *** enhanced the levels of DAGs in liver but not in adipose tissue in this *** acid did not reverse the high DAG levels induced by HFD in ***,in HFD-fed mice,palmitoleic acid reduced insulin resistance by an independent-manner of *** might be associated with the beneficial effects of palmitoleic acid on altering the gut microbiota composition,improving of intestinal barrier function,and downregulating the inflammation in colon,liver,and adipose tissue.

关键词： Palmitoleic acid High fat diet Insulin resistance Gut microbiota

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Dietary Lipid Intervention in the Prevention of Brain Aging

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Engineering 2024年第6期37卷 128-137页

作者： Wei Xiong Bing Fang Xiaoyu Wang Ming Zhang Min du Jiazeng Sun Juan Chen Yixuan Li Changhao Sun Xingen lei Xue Zhang Fazheng Ren Key Laboratory of Precision Nutrition and Food Quality Department of Nutrition and HealthChina Agricultural UniversityBeijing 100083China Key Laboratory of Functional Dairy Co-Constructed by the Ministry of Education and Beijing MunicipalityCollege of Food Science and Nutritional EngineeringChina Agricultural UniversityBeijing 100083China School of Food Science and Chemical Engineering Beijing Technology and Business UniversityBeijing 100048China Department of Animal Science Washington State UniversityPullmanWA 99164USA Department of Nutrition and Food Hygiene School of Public HealthHarbin Medical UniversityHarbin 150028China Department of Animal Science Cornell UniversityIthacaNY 14853USA National Health Commission(NHC)and Chinese Academy of Medical Sciences(CAMS)Key Laboratory of Molecular Probe and Targeted Theranostics Harbin Medical UniversityHarbin 150028China

As people live longer,the burden of aging-related brain diseases,especially dementia,is *** aging increases the risk of cognitive impairment,which manifests as a progressive loss of neuron function caused by the impairment of synaptic plasticity via disrupting lipid ***,supplemental dietary lipids have the potential to prevent brain *** review summarizes the important roles of dietary lipids in brain function from both structure and mechanism *** and animal studies have provided evidence of the functions of polyunsaturated fatty acids(PUFAs)in brain *** results of interventions indicate that phospholipids—including phosphatidylcholine,phosphatidylserine,and plasmalogen—are efficient in alleviating cognitive impairment during aging,with plasmalogen exhibiting higher efficacy than *** is a recognized nutrient used in clinical trials due to its special vinyl ether bonds and abundance in the postsynaptic membrane of *** research should determine the dose-dependent effects of plasmalogen in alleviating brain-aging diseases and should develop extraction and storage procedures for its clinical application.

关键词： Brain aging Nutritional intervention Phospholipids Phosphatidylcholine Phosphatidylserine Plasmalogen

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Knee osteoarthritis:A review of animal models and intervention of traditional Chinese medicine

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Animal Models and Experimental Medicine 2024年第2期7卷 114-126页

作者： Xuyu Song Ying Liu Siyi Chen lei Zhang Huijie Zhang Xianhui Shen Hang du Rong Sun Orthopaedic trauma surgery The Second Hospital of Shandong UniversityJinanShandongChina Academy of Traditional Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjinChina Department of Traditional Chinese Medicine The Second Hospital of Shandong UniversityJinanShandongChina College of pharmacy Shandong University of Traditional Chinese MedicineJinanShandongChina The Second Clinical College of Shandong University Shandong UniversityJinanShandongChina Advanced Medical Research Institute Shandong UniversityJinanShandongChina The Second Hospital of Shandong University JinanShandongChina

Background:Knee osteoarthritis(KOA)characterized by degeneration of knee cartilage and subsequent bone hyperplasia is a prevalent joint condition primarily affecting aging *** pathophysiology of KOA remains poorly understood,as it involves complex mechanisms that result in the same ***,researchers are interested in studying KOA and require appropriate animal models for basic *** herbal compounds,which consist of multiple herbs with diverse pharmacological properties,possess characteristics such as multicomponent,multipathway,and multitarget *** potential benefits in the treatment of KOA continue to attract ***:This study aims to provide a comprehensive overview of the advantages,limitations,and specific considerations in selecting different species and methods for KOA animal *** will help researchers make informed decisions when choosing an animal ***:Online academic databases(e.g.,PubMed,Google Scholar,Web of Science,and CNKI)were searched using the search terms“knee osteoarthritis,”“animal models,”“traditional Chinese medicine,”and their combinations,primarily including KOA studies published from 2010 to ***:Based on literature retrieval,this review provides a comprehensive overview of the methods of establishing KOA animal models;introduces the current status of advantages and disadvantages of various animal models,including mice,rats,rabbits,dogs,and sheep/goats;and presents the current status of methods used to establish KOA animal ***:This study provides a review of the animal models used in recent KOA research,discusses the common modeling methods,and emphasizes the role of traditional Chinese medicine compounds in the treatment of KOA.

关键词： animal models knee osteoarthritis system review traditional Chinese medicine

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Metarelation2vec:A Metapath-Free Scalable Representation Learning Model for Heterogeneous Networks

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Tsinghua Science and Technology 2024年第2期29卷 553-575页

作者： lei Chen Yuan Li Yong lei Xingye Deng School of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Computer Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China

Metapaths with specific complex semantics are critical to learning diverse semantic and structural information of heterogeneous networks(HNs)for most of the existing representation learning ***,any metapaths consisting of multiple,simple metarelations must be driven by domain *** sensitive,expensive,and limited metapaths severely reduce the flexibility and scalability of the existing models.A metapath-free,scalable representation learning model,called Metarelation2vec,is proposed for HNs with biased joint learning of all metarelations in a bid to address this ***,a metarelation-aware,biased walk strategy is first designed to obtain better training samples by using autogenerating cooperation probabilities for all metarelations rather than using expert-given ***,grouped nodes by the type,a common and shallow skip-gram model is used to separately learn structural proximity for each node ***,grouped links by the type,a novel and shallow model is used to separately learn the semantic proximity for each link ***,supervised by the cooperation probabilities of all meta-words,the biased training samples are thrown into the shallow models to jointly learn the structural and semantic information in the HNs,ensuring the accuracy and scalability of the *** experimental results on three tasks and four open datasets demonstrate the advantages of our proposed model.

关键词： metarelation random walk heterogeneous network metapath representation learning

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White light emission in 0D halide perovskite[(CH_(3))_(3)S]_(2)SnCl_(6)·H_(2)O crystals through variation of doping ns^(2) ions

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Frontiers of Optoelectronics 2024年第1期17卷 57-66页

作者： Yitong Lin Yu Zhong Yangpeng Lin Jiawei Lin lei Pang Zhilong Zhang Yi Zhao Xiao‑Ying Huang Ke‑Zhao du Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering Collage of Chemistry and Material ScienceFujian Normal UniversityFuzhou 350007China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Qinghai Environmental Monitoring Center Xining 810000China Strait Institute of Flexible Electronics(SIFE Future Technologies)Fujian Normal University and Strait Laboratory of Flexible Electronics(SLoFE)Fuzhou 350007China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

With the rapid development of white LEDs,the research of new and efficient white light emitting materials has attracted increasing *** dimensional(0D)organic–inorganic hybrid metal halide perovskites with superior luminescent property are promising candidates for LED application,due to their abundant and tailorable ***,[(CH_(3))_(3)S]_(2)SnCl_(6)・H_(2)O is synthesized as a host for dopant ions Bi^(3+)and Sb^(3+).The Sb^(3+)doped,or Bi^(3+)/Sb^(3+)co-doped,[(CH_(3))3S]_(2)SnCl_(6)・H_(2)O has a tunable optical emission spectrum by means of varying dopant ratio and excitation *** a result,we can achieve single-phase materials suitable for emission ranging from cold white light to warm white *** intrinsic mechanism is examined in this work,to clarify the dopant effect on the optical *** high stability of title crystalline material,against water,oxygen and heat,makes it promising for further application.

关键词： 0D Metal halide White light Perovskite Ions doping Excitation dependent

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Harnessing Theaflavin-3，3'-Digallate for Virulence Attenuation: A Targeted Approach Against Foodborne Staphylococcus aureus Pathogenicity

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Food Science and Human Wellness 2024年

作者： Yujia Chen Hanjiang du lei Wang Yueying Wang Zhangyu du Dongbin Guo Li Wang Bingmei Wang Wei Li Department of Gastrocolorectal Surgery， General Surgery Center， The First Hospital of Jilin University Faculty of Medicine， International University of Health and Welfare Department of Gastric and Colorectal Surgery， Jilin Cancer Hospital College of Integrated Traditional Chinese and Western Medicine， Changchun University of Chinese Medicine Clinical Medical College， Changchun University of Chinese Medicine

Addressing the uncontrolled spread and increase in antibiotic resistance in methicillin-resistant Staphylococcus aureus （MRSA） will require new control strategies， particularly to improve the safety of food. Our results revealed the efficacy of Theaflavin-3，3'-digallate （TFBG）， which is a novel polyphenol derived from tea， in targeting the key regulatory protein MgrA in S. aureus. Through fluorescence anisotropy， we showed that the IC50of TFBG was 26.76 μg/mL. TFBG uniquely counters S. aureus by regulating its virulence factors and adhesion processes rather than by killing the bacteria directly. This compound alters the expression of key virulence factors and modulates the transcription levels of genes related to adhesion in S. aureus， ultimately reducing the bacteria’s ability to adhere to fibrinogen and its hemolytic activity. Our assays confirmed that TFBG directly interacts with the MgrA protein in MRSA， and we identified critical binding sites. Our in vivo studies highlighted the potent efficacy of TFBG. TFBG administration is an innovative approach to improve food safety by diminishing MRSA virulence and reducing its pathogenicity.

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