检索结果-南通市图书馆

Molecule-based vertical transistor via intermolecular charge transport throughπ-πstacking

Nano Research 2024年第5期17卷 4573-4581页

作者： Cheng Liu Cheng Fu Lingyu Tang Jianghua Wu Zhangyan Mu yamei sun Yanghang Pan Bailin Tian Kai Bao Jing Ma Qiyuan He Mengning Ding Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Theπ-πstacking is a well-recognized intermolecular interaction that is responsible for the construction of electron hopping channels in numerous conducting frameworks/***,the exact role ofπ-to-πchannels within typical single crystalline organic semiconductors remains unclear as the orientations of these molecules are diverse,and their control usually requires additional side chain groups that misrepresent the intrinsic properties of the original semiconducting ***,the construction of conduction channels with intrinsicπ-πstacking in the molecule-based device is crucial for the utilization of their unique transport characteristics and understanding of the transport *** this end,we present a molecular intercalation strategy that integrates two-dimensional layered materials with functional organic semiconductor molecules for functional molecule-based *** organic semiconductor molecules can be effectively intercalated into the van der Waals gaps of semi-metallic TaS_(2) withπ-πstacking configuration and controlled intercalant *** results show that the vertical charge transport in the stacking direction shows a tunneling-dominated mechanism that strongly depends on the molecular ***,we demonstrated a new type of molecule-based vertical transistor in which TaS_(2) andπ-πstacked organic molecules function as the electrical contact and the active channel,***/off ratios as high as 447 are achieved under electrostatic modulation in ionic liquid,comparable to the current state-of-the-art molecular *** study provides an ideal platform for probing intrinsic charge transport acrossπ-πstacked conjugated molecules and also a feasible approach for the construction of high-performance molecule-based electronic devices.

关键词： π-πstacking electrochemical intercalation organic semiconductor electrical transport tunneling field effect transistor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bi nanoparticles in situ encapsulated by carbon film as high-performance anode materials for Li-ion batteries

引用

Journal of Energy Chemistry 2022年第6期31卷 524-530,I0015页

作者： Jun Yang Jiahui Xian Qinglin Liu yamei sun Guangqin Li MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510006GuangdongChina

Bismuth (Bi) has indeed inspired great interests in lithium-ion batteries (LIBs) due to the high capacity,but was still limited by the low electrical conductivity and large volume ***,a composite material based on Bi nanoparticles in situ encapsulated by carbon film (Bi@CF) is prepared successfully through a facile metal–organic framework (MOF)-engaged *** anode materials for LIBs,the Bi@CF composites achieved high reversible capacities of 705 and 538 mAh g^(-1)at 0.2 and 0.5 A g^(-1) after200 cycles,and long cycling performance with a stable capacity of 306 mAh g^(-1)at 1.0 A g^(-1) even after 900 *** situ X-ray diffraction (XRD) measurements clearly revealed the conversion between Bi and Li_(3)Bi during the alloying/dealloying process,confirming the good electrochemical reversibility of Bi@CF for *** reaction kinetics of this Bi@CF composite was further studied by galvanostatic intermittent titration technique (GITT).This work may provide an inspiration for the elaborate design and facile preparation of alloy-type anode materials for high-performance rechargeable batteries.

关键词： Bi nanoparticles Carbon film Anode materials Lithium-ion batteries In situ XRD

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

AN AUTOMATIC MAPPING METHOD OF SURFACE DISSECTION DENSITY MAP

引用

地图 1989年第2期 84-89页

作者： sun yamei sun Yiyi

This paper deals with the plinciple and method of automated analysis and recognition of valley line by topological transformation, calculation of surface dissection density map on the basis of Digital Elevation Model(... 详细信息

关键词： dissection topological valley SURFACE automated erosive deals elevation erior convert

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

V_(8)C_(7)/C稳定的超细Ru纳米颗粒用于全pH下的析氢反应

引用

Science Bulletin 2024年第6期69卷 763-771页

作者：龙艳菊沈勇江萍萍苏徽冼家慧孙亚美杨俊宋海利刘庆华李光琴 Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education Lehn Institute of Functional MaterialsGuangdong Provincial Key Laboratory for High Performance Polymeric CompositesInstitute of Green Chemistry and Molecular EngineeringSchool of ChemistrySun Yat-sen UniversityGuangzhou 510006China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Key Laboratory of Light Energy Conversion Materials of Hunan Province College College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China

The development of cost-effective electrocatalysts with high efficiency and long durability for hydrogen evolution reaction(HER)remains a great challenge in the field of water ***,we design an ultrafine and highly dispersed Ru nanoparticles stabilized on porous V_(8)C_(7)/C matrix via pyrolysis of the metal-organic frameworks V-BDC(BDC:1,4-benzenedicarboxylate).The obtained Ru-V_(8)C_(7)/C composite exhibits excellent HER performance in all p H *** the overpotential of 40 mV,its mass activity is about 1.9,4.1 and 9.4 times higher than that of commercial Pt/C in acidic,neutral and alkaline media,***,Ru-V_(8)C_(7)/C shows the remarkably high stability in all p H ranges which,in particular,can maintain the current density of 10 m A cm^(-2)for over 150 h in 1.0 mol L^(-1)phosphate buffer saline(PBS).This outstanding HER performance can be attributed to the high intrinsic activity of Ru species and their strong interface interactions to the V_(8)C_(7)/C *** synergistic effect of abundant active sites on the surface and the formed Ru-C-V units at the interface promotes the adsorption of reaction intermediates and the release of active sites,contributing the fast HER *** work provides a reference for developing versatile and robust HER catalysts by surface and interface regulation for pH tolerance.

关键词： Ruthenium Metal-organic frameworks Transition metal carbides Hydrogen evolution Nanoparticles

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

急性心肌梗死并发消化道出血患者住院死亡的危险因素分析

引用

中国医刊 2024年第2期59卷 149-153页

作者：罗方铱陈雪孙亚梅张杰首都医科大学附属北京安贞医院消化内科北京100029

目的探讨急性心肌梗死(AMI)并发消化道出血(GIB)患者住院期间死亡的危险因素。方法以2012年1月至2023年4月于首都医科大学附属北京安贞医院诊断为AMI并发GIB患者为研究对象,将其中住院期间死亡的53例患者纳入死亡组,存活的223例患者纳... 详细信息

目的探讨急性心肌梗死(AMI)并发消化道出血(GIB)患者住院期间死亡的危险因素。方法以2012年1月至2023年4月于首都医科大学附属北京安贞医院诊断为AMI并发GIB患者为研究对象,将其中住院期间死亡的53例患者纳入死亡组,存活的223例患者纳入存活组。通过单因素分析及多因素logistic回归模型筛选AMI并发GIB患者住院期间死亡的危险因素。结果单因素分析结果显示,死亡组患者入院时的Killip分级高级别比例、新发心律失常和机械性并发症比例、心率、白细胞、尿素氮及肌酐水平以及住院期间接受输血治疗比例均高于存活组,收缩压及左心室射血分数低于存活组,差异有统计学意义(P100次/min(OR=3.765,95%CI 1.448~9.790)、尿素氮水平(OR=1.118,95%CI 1.013~1.234)以及输血(OR=2.451,95%CI 1.109~5.421)与AMI并发GIB患者住院期间死亡风险增加独立相关。结论新发心律失常、心率>100次/min、尿素氮水平、输血是AMI并发GIB患者住院期间死亡的危险因素。

关键词：急性心肌梗死消化道出血危险因素住院死亡率

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的危险因素分析

引用

中国医药 2024年第1期19卷 20-24页

作者：魏梦珂孙亚梅陈雪张杰首都医科大学附属北京安贞医院消化内科北京100029

目的探讨非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的危险因素。方法选取2016年1月至2023年5月在首都医科大学附属北京安贞医院住院的因非瓣膜性心房颤动服用新型口服抗凝药的患者,纳入在住院期间发生消化道出血的患者作... 详细信息

目的探讨非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的危险因素。方法选取2016年1月至2023年5月在首都医科大学附属北京安贞医院住院的因非瓣膜性心房颤动服用新型口服抗凝药的患者,纳入在住院期间发生消化道出血的患者作为出血组,根据年龄、性别及新型口服抗凝药的类型和剂量进行1∶2随机匹配,纳入在住院期间未发生消化道出血的患者作为未出血组。收集2组患者一般资料、合并症、药物使用、化验指标等信息。采用Logistic回归分析探讨非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的危险因素,绘制受试者工作特征(ROC)曲线并计算曲线下面积(AUC)以评估危险因素对非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的预测价值。结果共纳入服用新型口服抗凝药的患者153例,其中出血组患者51例,未出血组患者102例。出血组患者合并冠心病(冠状动脉粥样硬化性心脏病)、心功能不全、既往消化道出血史、消化性溃疡、贫血、慢性肾功能不全、静脉血栓栓塞症、周围血管病比例均高于未出血组(均P<0.05)。出血组患者的基线血红蛋白水平低于未出血组,中性粒细胞百分比、血尿素氮、D-二聚体水平高于未出血组(均P<0.05)。多因素Logistic回归分析结果显示,冠心病(比值比=4.678,95%置信区间:1.600~13.677)、既往消化道出血史(比值比=9.906,95%置信区间:1.449~67.742)、慢性肾功能不全(比值比=4.893,95%置信区间:1.122~21.330)、贫血(比值比=13.487,95%置信区间:1.847~98.496)、D-二聚体(比值比=1.001,95%置信区间:1.000~1.003)是新型口服抗凝药治疗非瓣膜性心房颤动时发生消化道出血的独立危险因素。联合上述指标绘制ROC曲线,曲线下面积(AUC)为0.905(95%置信区间:0.854~0.955,P<0.001)。结论冠心病、既往消化道出血史、慢性肾功能不全、贫血、D-二聚体是非瓣膜性心房颤动患者服用新型口服抗凝药发生消化道出血的独立危险因素。

关键词：非瓣膜性心房颤动新型口服抗凝药消化道出血危险因素

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unravelling the critical role of surface Nafion adsorption in Ptcatalyzed oxygen reduction reaction by in situ electrical transport spectroscopy

引用

Science China Chemistry 2022年第11期65卷 2290-2298页

作者： yamei sun Jingyi Tian Zhangyan Mu Bailin Tian Qiulan Zhou Cheng Liu Shengtang Liu Qiang Wu Mengning Ding Key Laboratory of Mesoscopic Chemistry of MOE State Key Laboratory of Analytical Chemistry for Life SciencesSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

Solid-state ionic conductor is a vital part in all electrochemical energy conversion devices. As a widely-applied protonconducting polymer and stabilizer for electrode preparation, Nafion has key applications in electrochemical devices operated under acidic conditions. Specific adsorption of Nafion on the catalyst surface is considered to result in partial loss of intrinsic activity in reactions such as oxygen reduction reaction(ORR), due to its comprehensive occupation of active sites. Many in situ characterization methods such as voltammetric fingerprinting and spectroscopic approaches have been used to explore the dynamic adsorption of Nafion on the electrode surface. However, most of current efforts have been focused on the behaviors of Nafion itself, with little attention paid to its effects on the adsorption of surface intermediates. Here, we employed the in situ electrical transport spectroscopy(ETS) to investigate Nafion adsorption on Pt catalysts and its effects on the ORR *** findings suggest that specific adsorption of Nafion results in the increased coverage of oxygen intermediates with weaker adsorption strength, which in turn plays a critical role in the reaction selectivity. The successful application of ETS on the dynamic characterization of reaction intermediates provides a novel perspective for catalyst design in ORR-related applications in future sustainable chemistry.

关键词： electrical transport spectroscopy Nafion adsorption oxygen reduction reaction platinum hydrogen peroxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Single-atomic Fe anchored on hierarchically porous carbon frame for efficient oxygen reduction performance

引用

Chinese Chemical Letters 2022年第2期33卷 1070-1073页

作者： Yaling Jia Fangshuai Zhang Qinglin Liu Jun Yang Jiahui Xian yamei sun Yinle Li Guangqin Li MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China

Exploring platinum group metal-free electrocatalysts with superior catalytic performance and favorable durability for oxygen reduction reaction is a remaining bottleneck in process of developing sustainable techniques in energy storage and conversion. Herein, a hierarchical porous single atomic Fe electrocatalyst(Fe/Z8-E-C) is rationally designed and synthesized via acid etching, calcination, adsorption of Fe precursor and recalcination processes. This unique electrocatalyst Fe/Z8-E-C shows excellent oxygen reduction performance with a half-wave potential of 0.89 V in 0.1 mol/L KOH, 30 m V superior to that of commercial Pt/C(0.86 V), which is also significantly higher than that of typical Fe-doped ZIF-8 derived carbon nanoparticles(Fe/Z8-C) with a half-wave potential of 0.84 V. Furthermore, Fe/Z8-E-C-based Zn-air battery exhibits greatly enhanced peak power density and specific capacity than those of original Fe/Z8-C,verifying the remarkable performance and practicability of this specially designed hierarchical structure due to its efficient utilization of the active sites and rapid mass transfer. This present work proposes a new method to rationally synthesize single atom electrocatalysts loaded on hierarchical porous frame materials for catalysis and energy conversion.

关键词： Single atom Fe High atom utilization Efficient mass transfer Oxygen reduction reaction Zinc-air battery Efficient performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of Sky Conditions on Net Ecosystem Productivity over a “Floating Blanket” Wetland in Southwest China

引用

Advances in Atmospheric Sciences 2024年第2期41卷 355-368页

作者： yamei SHAO Huizhi LIU Qun DU Yang LIU Jihua sun Yaohui LI Jinlian LI State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100029China Yunnan Meteorological Observatory Kunming 530100China College of Aviation Meteorology Civil Aviation Flight University of ChinaGuanghan 618307China Meteorological Bureau of Tengchong County Baoshan 679100China

Based on eddy covariance(EC) measurements during 2016–20, the effects of sky conditions on the net ecosystem productivity(NEP) over a subtropical “floating blanket ” wetland were investigated. Sky conditions were divided into overcast, cloudy, and sunny conditions. On the half-hourly timescale, the daytime NEP responded more rapidly to the changes in the total photosynthetic active radiation(PARt) under overcast and cloudy skies than that under sunny skies. The increase in the apparent quantum yield under overcast and cloudy conditions was the greatest in spring and the least in summer. Additionally, lower atmospheric vapor pressure deficit(VPD) and moderate air temperature were more conducive to enhancing the apparent quantum yield under cloudy skies. On the daily timescale, NEP and the gross primary production(GPP) were higher under cloudy or sunny conditions than those under overcast conditions across seasons. The daily NEP and GPP during the wet season peaked under cloudy skies. The daily ecosystem light use efficiency(LUE) and water use efficiency(WUE) during the wet season also changed with sky conditions and reached their maximum under overcast and cloudy skies, respectively. The diffuse photosynthetic active radiation(PAR_d) and air temperature were primarily responsible for the variation of daily NEP from half-hourly to monthly timescales, and the direct photosynthetic active radiation(PAR_b) had a secondary effect on NEP. Under sunny conditions, PAR_b and air temperature were the dominant factors controlling daily NEP. While daily NEP was mainly controlled by PAR_d under cloudy and overcast conditions.

关键词： diffuse radiation eddy covariance NEP controlling factors wetland path analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative transcriptome analysis between rhesus macaques(Macaca mulatta) and crab-eating macaques(M. fascicularis)

引用

Zoological Research 2024年第2期45卷 299-310页

作者： Yu-Xiang Mao yamei Li Zikun Yang Ning Xu Shilong Zhang Xuankai Wang Xiangyu Yang Qiang sun Yafei Mao Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science&Intelligence TechnologyChinese Academy of SciencesShanghai 200031China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Shanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Genetic Evolution&Animal Models Chinese Academy of SciencesKunmingYunnan 650201China Bio-X Institutes Key Laboratory for the Genetics of Developmental and Neuropsychiatric DisordersMinistry of EducationShanghai Jiao Tong UniversityShanghai 200030China Zhiyuan College Shanghai Jiao Tong UniversityShanghai 200240China Center for Genomic Research International Institutes of MedicineFourth Affiliated HospitalZhejiang UniversityYiwuZhejiang 322000China

Understanding gene expression variations between species is pivotal for deciphering the evolutionary diversity in phenotypes. Rhesus macaques(Macaca mulatta, MMU)and crab-eating macaques(M. fascicularis, MFA) serve as crucial nonhuman primate biomedical models with different phenotypes. To date, however, large-scale comparative transcriptome research between these two species has not yet been fully explored. Here, we conducted systematic comparisons utilizing newly sequenced RNA-seq data from84 samples(41 MFA samples and 43 MMU samples)encompassing 14 common tissues. Our findings revealed a small fraction of genes(3.7%) with differential expression between the two species, as well as 36.5% of genes with tissue-specific expression in both macaques. Comparison of gene expression between macaques and humans indicated that 22.6% of orthologous genes displayed differential expression in at least two tissues. Moreover,19.41% of genes that overlapped with macaque-specific structural variants showed differential expression between humans and macaques. Of these, the FAM220A gene exhibited elevated expression in humans compared to macaques due to lineage-specific duplication. In summary,this study presents a large-scale transcriptomic comparison between MMU and MFA and between macaques and humans. The discovery of gene expression variations not only enhances the biomedical utility of macaque models but also contributes to the wider field of primate genomics.

关键词： Crab-eating macaques Rhesus macaques Comparative transcriptomics Biomedical models Nonhuman primates RNA-seq Duplicated genes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：