检索结果-南通市图书馆

Two-dimensional In_(2)Se_(3):A rising advanced material for ferroelectric data storage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

InfoMat 2022年第8期4卷 54-81页

作者： Yu-Ting Huang nian-Ke Chen Zhen-Ze Li Xue-Peng Wang Hong-Bo Sun Shengbai Zhang xian-Bin Li State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchunChina State Key Lab of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijingChina Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNew YorkUSA

Ferroelectric memory is a promising candidate for next-generation nonvolatile memory owing to its outstanding performance such as low power consump-tion,fast speed,and high ***,the ferroelectricity of conven-tional ferroelectric materials will be eliminated by the depolarization field when the size drops to the nanometer *** a result,the miniaturization of ferroelectric devices was hindered,which makes ferroelectric memory unable to keep up with the development of integrated-circuit(IC)***,a two-dimensional(2D)In2Se3 was reported to maintain stable ferro-electricity at the ultrathin scale,which is expected to break through the bottle-neck of ***,devices based on 2D In2Se3,including the ferroelectric field-effect transistor,ferroelectric channel transistor,synaptic fer-roelectric semiconductor junction,and ferroelectric memristor were ***,a comprehensive understanding of the structures and the ferroelectric-switching mechanism of 2D In2Se3 is still ***,the atomic structures of different phases,the dynamic mechanism of ferroelectric switching,and the performance/functions of the latest devices of 2D In2Se3 are ***,the correlations among the structures,the properties,and the device performance are ***,several crucial problems or challenges and possible research directions are put *** hope that this review paper can provide timely knowledge and help for the research commu-nity to develop 2D In2Se3 based ferroelectric memory and computing technol-ogy for practical industrial applications.

关键词： 2D ferroelectric device 2D ferroelectric material 2D In2Se3 neuromorphic computing nonvolatile memory

Effects of long-term grazing exclusion on vegetation structure,soil water holding capacity,carbon and nitrogen sequestration capacity in an alpine meadow on the Tibetan Plateau

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2023年第3期20卷 779-791页

作者： YANG Yong-sheng ZHANG Fa-wei XIE xian-rong WANG Jun-bang LI Ying-nian HUANG Xiao-tao LI Hui-ting ZHOU Hua-kun Key Laboratory of Adaptation and Evolution of Plateau Biota and Key Laboratory of Restoration Ecology in Cold Region of Qinghai Province Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810008China Qinghai Haibei National Field Research Station of Alpine Grassland Ecosystem Xining 810008China Xi Ning Municipal Beishan Forestry Farm Xining 810003China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Grazing exclusion is one of the primary management practices used to restore degraded grasslands on the Tibetan ***,to date,the effects of long-term grazing exclusion measures on the process of restoring degraded alpine meadows have not been *** this study,moderately degraded plots,in which the vegetation coverage was approximately 65%and the dominant plant species was Potentilla anserina L,with grazing exclusion for 2 to 23 years,were selected in alpine meadows of Haibei in Qinghai-Tibet *** coverage,plant height,biomass,soil bulk density,saturated water content,soil organic carbon(SOC)and total nitrogen(TN)were *** results were as follows:(1)With aboveground biomass and total saturated water content at 0-40 cm depth,the average SOC and TN contents in moderately degraded alpine meadows increased as a power function,and the plant height increased as a log function.(2)The average soil bulk density at 0-40 cm depth first decreased and then increased with increasing grazing exclusion duration,and the minimum value of 0.90 g·cm^(-3) was reached at 15.23 *** plant coverage,total belowground biomass at 0-40 cm depth,total aboveground and belowground biomass first increased and then decreased,their maximum values(80.49%,2452.92g·m^(-2),2891.06 g·m^(-2))were reached at 9.41,9.46 and 10.25 years,***-term grazing exclusion is apparently harmful for the sustainable restoration of degraded alpine *** optimal duration of grazing exclusion for the restoration of moderately degraded alpine meadows was 10 *** research suggests that moderate disturbance should be allowed in moderately degraded alpine meadows after 10years of grazing exclusion.

关键词： Long-term grazing exclusion Soil water holdingcapacity Soilcarbonand nitrogen sequestration Biomass Alpine meadow

Monitoring the little fire ant,Wasmannia auropunctata(Roger 1863),in the early stage of its invasion in china:Predicting its geographical distribution pattern under climate change

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第9期22卷 2783-2795页

作者： ZHAO Hao-xiang xian Xiao-qing GUO Jian-yang YANG nian-wan ZHANG Yan-ping CHEN Bao-xiong HUANG Hong-kun LIU Wan-xue State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural ScienceBeijing 100193P.R.China Western Agricultural Research Center Chinese Academy of Agricultural SciencesChangji 831100P.R.China Rural Energy and Environment Agency Ministry of Agriculture and Rural AffairsBeijing 100193P.R.China

Invasive alien ants(IAAs)are among the most aggressive,competitive,and widespread invasive alien species(IAS)*** auropunctata,the greatest IAAs threat in the Pacific region and listed in“100 of the world’s worst IAS”,has established itself in many countries and on islands *** populations of *** were recently reported in southeastern china,representing a tremendous potential threat to china’s agricultural,economic,environmental,public health,and social *** the potential geographical distribution(PGD)of *** in china can illustrate areas that may potentially face invasion ***,based on the global distribution records of *** and bioclimatic variables,we predicted the geographical distribution pattern of *** in china under the effects of climate change using an ensemble model(EM).Our findings showed that artificial neural network(ANN),flexible discriminant analysis(FDA),gradient boosting model(GBM),Random Forest(RF)were more accurate than categorical regression tree analysis(CTA),generalized linear model(GLM),maximum entropy model(MaxEnt)and surface distance envelope(SRE).The mean TSS values of ANN,FDA,GBM,and RF were 0.820,0.810,0.843,and 0.857,respectively,and the mean AUC values were 0.946,0.954,0.968,and 0.979,*** mean TSS and AUC values of EM were 0.882 and 0.972,respectively,indicating that the prediction results with EM were more reliable than those with the single *** PGD of *** in china is mainly located in southern china under current and future climate *** climate change,the PGD of *** in china will expand to higher-latitude *** annual temperature range(bio7)and mean temperature of the warmest quarter(bio10)were the most significant variables affecting the PGD of *** in *** PGD of *** in china was mainly attributed to temperature variables,such as the annual temperature range(bio7

关键词： invasive alien ants potential geographical distribution Wasmannia auropunctata climate change Ensemble model

Time-dependent density-functional theory molecular-dynamics study on amorphization of Sc-Sb-Te alloy under optical excitation

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 1376-1380页

作者： Xue-Peng Wang xian-Bin Li nian-Ke Chen Junhyeok Bang Ryky Nelson Christina Ertural Richard Dronskowski Hong-Bo Sun Shengbai Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University130012 ChangchunChina Department of Physics Chungbuk National University28644 ChungbukRepublic of Korea Institute of Inorganic Chemistry RWTH Aachen University52056 AachenGermany Hoffmann Institute of Advanced Materials Shenzhen Polytechnic518055 ShenzhenChina State Key Lab of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua Univerwsity100084 BeijingChina Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNY 12180USA

Recently,all-optical memory and optical-computation properties of phase-change materials are receiving intensive *** writing/erasing information in these devices is usually achieved by laser pulses,the interaction between the laser and the phase-change materials becomes a key issue for such new *** this work,by a time-dependent density-functional theory molecular-dynamics study,the physics underlying the optical excitation induced amorphization of Sc-Sb-Te is revealed,which goes back to superatom-like Sc-centered structural *** motifs are found to be still robust under the excitation.

关键词： optical excitation theory

Ruthenium Coordination Compounds with Polypyridines(Ⅵ)--Interaction of Ruthenium Polypyridine Complexes with Calf Thymus DNA-An Example of Non-intercalative Binding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in chinese Universities 1997年第4期13卷 3-8页

作者： YANG Guang WANG Lei WU Jian-zhong ZENG Tian-xian JI Liang-nian Department of Chemistry Zhongshan UniversityGuangzhou510275 State Key Laboratory for Oxa Synthesis and Selective Oxidation Lanzhou Institution of Chemical PhysicsChinese Academy of SciencesLanzhou730000

Two new ruthenium polypyridine complexes, L 2RuL 2+ (L represents 2,2 bipyridine(bpy) or 1,10 phenanthroline(phen); L  represents Schiff base derived from 4,5 diazafluoren 9 one(AFO) and n propylamine) have been prepared and characterized by means of elementary analyses, electronic absorption and IR spectra. The binding of the complexes to calf thymus DNA has been investigated via absorption, emission spectrometry, emission quenching, equilibrium dialysis and circular dichroism spectrometry. The experimental results show that these two complexes bind to calf thymus DNA by electrostatic mode and by non intercalative binding mode respectively.

关键词： Ruthenium Polypyridine Calf thymus DNA

A One-pot Procedure to Prepare Ethynylferrocene and Iodoethynylferrocene

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 2001年第5期12卷 387-390页

作者： Ji Shan WU Chun Yan chi xian Hong WANG Xiao Jiang ZHAO Ji LI Fo Song WANG State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022

Ethynylferrocene and iodoethynylferrocene were prepared in high yield as 88-90% through a one-pot procedure. 1, 1'-diiodoferrocenylene was in-situ prepared from reaction of chi3 PPh3, t-BuOK and ferrocenecarboxaldehyd... 详细信息

关键词： Ferrocene derivatives Wittig-type reaction.

Moxibustion regulates inflammatory mediators and colonic mucosal barrier in ulcerative colitis rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第8期22卷 2566-2575页

作者： Tie-Ming Ma Na Xu xian-De Ma Zeng-Hua Bai Xing Tao Hong-chi Yan Liaoning University of Traditional chinese Medicine Shenyang 110847 Liaoning Province China

AIM: To observe the efficacy and mechanism of grain-sized moxibustion at different acupoints in a rat model of ulcerative colitis (UC). METHODS: Sprague-Dawley rats were randomly divided into control, UC model, grain-sized moxibustion at a single acupoint (CV 12), grain-sized moxibustion at two acupoints (CV 12 and CV 4), grain-sized moxibustion at three acupoints (CV 12, CV 4, and ST 36), and medication groups (n = 8/group). The UC model was established by enema of trinitrobenzene sulfonic acid. Direct moxibustion was used once a day for 7 d. Disease activity index (DAI) was evaluated before and after the treatment. Morphologic changes of intestinal tissue were observed under an optical microscope. The expression of tumor necrosis factor (TNF)-alpha and p38 mitogen-activated protein kinase (p38MAPK) in colonic tissue was detected using Western blot, and the levels of occludin and zonula occludens-1 (ZO-1) mRNAs were detected using reverse transcription PCR. RESULTS: Compared with the control group, the intestinal mucosae were incomplete in the model group, glandular structures were irregular, and submucosae were edematous, hyperemic, and infiltrated with inflammatory cells. The DAI scores and expression of TNF-alpha and p38MAPK were increased significantly in the model group compared to controls (Ps < 0.01), while the mRNA levels of occludin and ZO-1 were reduced significantly (Ps < 0.01). Compared with the model group, colonic mucosa and the arrangement of glands were complete and regular in the treatment groups. DAI scores and the expression of TNF-alpha and p38MAPK were reduced significantly in moxibustion groups compared to controls (Ps < 0.01), while the mRNA levels of occludin and ZO-1 were increased significantly (Ps < 0.01). The improvements in the above indices in the three acupoints group and the medication group were superior to those in the single and two acupoints groups (all P < 0.05). CONCLUSION: Reduction of TNF-alpha and p38MAPK and increased expre

关键词： Different acupoints Grain-sized moxibustion Inflammatory factors Intestinal mucosal barrier Ulcerative colitis

层合复合材料z-pinning增强技术的力学进展

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

航空学报 2006年第6期27卷 1194-1202页

作者：孙先念郑长良大连海事大学机电与材料工程学院辽宁大连116026

z-pinning技术是自20世纪90年代中期发展起来的一种增强层合复合材料层间韧性的新技术。此项技术通过在层合板内嵌入体分比小于5%的z-pin,能使层合板的Ⅰ型层间断裂韧性提高十几倍,减少50%由低能量冲击所产生的层间分层,并且只造成层合... 详细信息

z-pinning技术是自20世纪90年代中期发展起来的一种增强层合复合材料层间韧性的新技术。此项技术通过在层合板内嵌入体分比小于5%的z-pin,能使层合板的Ⅰ型层间断裂韧性提高十几倍,减少50%由低能量冲击所产生的层间分层,并且只造成层合板面内拉压强度的少量退化或不退化。同时,z-pinning技术较之其他层间增强技术,如编织、纺织和缝合技术等,又具有易于加工,且便于控制工艺质量等优点。因此,这一技术在近年来逐渐受到重视,并在一些航空、航天复合材料结构中得到了应用。简要介绍了z-pinning技术的工艺特点,重点综述这一领域细观力学模型与实验测试等力学分析工作的最新进展,并对准确评估z-pin力学行为的研究工作进行了展望。

关键词：层合复合材料 z—pinning 分层层间增强分层韧性

Hydrogen peroxide detection with high specificity in living cells and inflamed tissues

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2016年第4期3卷 217-222页

作者： Lei Rong chi Zhang Qi Lei Ming-Ming Hu Jun Feng Hong-Bing Shu Yi Liu xian-Zheng Zhang Department of Chemistry Key Laboratory of Biomedical Polymers of Ministry of Education State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhanP.R.China

Hydrogen peroxide(H2O2)detection in biological systems is of significant importance,which act as critical second messenger in fundamental biological ***,we report on a chemoselective fluorescent naphthylimide peroxide probe(NPP)for the H_(2)O_(2)detection in vitro and in *** is a phenylboronic acid-caged chromophore that selectively responds to H_(2)O_(2)through a selfimmolate *** exhibited high sensitivity and selectivity to H_(2)O_(2)with distinctive fluorescence change due to the excellent two-photon excitation property,which permits the facile detection of inflammation produced H_(2)O_(2)and offers chance to monitor the inflammatory stages in diseased cells.

关键词： hydrogen peroxide fluorescence imaging inflammation