检索结果-南通市图书馆

同方期刊数据库博看期刊

Towards an all-vanadium redox flow battery with higher theoretical volumetric capacities by utilizing the VO^2＋/V^3＋ couple

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2018年第5期27卷 1381-1385页

作者： Wentao Duan Bin Li Dongping Lu Xiaoliang wei Zimin Nie Vijayakumar Murugesan James P. Kizewski Aaron Hollas David Reed Vincent Sprenkle wei wang Pacific Northwest National Laboratory RO. Box 999 Richland Washington 99352 United States

An all-vanadium redox flow battery with V（IV） as the sole parent active species is developed by accessing the VO2＋/V3＋ redox couple. These batteries, referred to as V4RBs, possess a higher theoretical volumetric c... 详细信息

关键词： Vanadium Redoxreactions Redox flow battery Energy density Cu

Species richness, forest types and regeneration of Schima in the subtropical forest ecosystem of Yunnan, southwestern China

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2020年第3期7卷 443-461页

作者： Cindy QTang Peng-Bin Han Shuaifeng Li Li-Qin Shen Diao-Shun Huang Yun-Fang Li Ming-Chun Peng Chong-Yun wang Xiao-Shuang Li wei Li wei wang Zhi-Ying Zhang Institute of Ecology and Geobotany College of Ecology and Environmental ScienceYunnan UniversityKunming650504China Research Institute on Resource Insects Chinese Academy of ForestryKunming650224China Caojian Forest Farm of Yunlong Forestry Bureau Yunlong County672711YunnanChina Yunnan Academy of Forestry Kunming650201China Tibet Agriculture and Animal Husbandry College Linzhi860000China

Background: Schima genus of Theaceae is confined to subtropics and tropics of South, East and Southeast *** species of Schima are distributed in subtropical China. Many of them appear as dominant canopy species in the subtropical forests. To date, Schima species richness distribution patterns of China have remained ***, there has been a longtime debate as to whether forests dominated by Schima species are early or late successional forests. We aim to clarify Schima species richness patterns and these species' roles in the forest succession and regeneration dynamics of the subtropical ecosystem in Yunnan Province, ***: We mapped Schima species richness distribution patterns in China. Based on 71 vegetation plots, we analyzed forest characteristics, population structure, and regeneration dynamics of Schima species in ***: Yunnan was found to harbor the greatest richness and the highest rarity-weighted richness of Schima species in the subtropical regions of China. We classified five primary and six secondary forest types containing Schima species as one of dominants. Yunnan had the high floristic diversity and varying stand structure of forests containing Schima species. The Schima species studied generally had a sporadic regeneration type and a long lifespan. Four species(Schima argentea, Schima villosa, Schima sinensis, Schima sericans) were shade-intolerant. But three species(Schima noronhae, Schima khasiana and Schima wallichii) were considered as bi-modal type species having shade-intolerant and shade-tolerant traits. Schima noronhae was seen to be a top dominant in late successional forests, while S. wallichii was found as a top-dominant in early or middle or late successional forests. ***, Schima villosa, Schima sinensis usually appeared as a top dominant in early or middle successional secondary forests, though they also presented as a second dominant in late-successional forests. Schima argentea and Schima se

关键词： Forest structure Regeneration dynamics Schima Species richness Forest succession Yunnan

Importance of Mitochondrial-Related Genes in Dilated Cardiomyopathy Based on Bioinformatics Analysis

在线全文

学校读者我要写书评

暂无评论

Cardiovascular Innovations and Applications 2020年第4期5卷 117-129页

作者： Yukuan Chen Xiaohui Wu Danchun Hu wei wang Shantou University Medical College Shantou515041 GuangdongPeople’s Republic of China Department of Cardiology Second Affi liated Hospital of Shantou University Medical CollegeShantou515041 GuangdongPeople’s Republic of China

We designed this study to identify potential key protein interaction networks,genes,and correlated pathways in dilated cardiomyopathy(DCM)via bioinformatics *** selected the GSE3586 microarray dataset,consisting of 15 dilated cardiomyopathic heart biopsy samples and 13 nonfailing heart biopsy ***,the GSE3586 dataset was downloaded and was analyzed with the limma package to identify differentially expressed genes(DEGs).A total of 172 DEGs consisting of 162 upregulated genes and ten downregulated genes in DCM were selected by the criterion of adjusted P values less than 0.01 and the log2-fold change of 0.6 or *** Ontology functional enrichment analysis and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway analysis were performed to view the biological processes,cellular components,molecular function,and KEGG pathways of the ***,protein-protein interactions were constructed,and the hub protein modules were identifi *** we selected the key genes DLD,UQCRC2,DLAT,SUCLA2,ATP5A1,PRDX3,FH,SDHD,and NDUFV1,which are involved in a wide range of biological activities,such as the citrate cycle,oxidation-reduction processes and cellular respiration,and energy derivation by oxidation of organic compounds in ***,we found that currently there are no related gene-targeting drugs after exploring the predicted interactions between key genes and drugs,and transcription *** conclusion,our study provides greater understanding of the pathogenesis and underlying molecular mechanisms in *** contributes to the exploration of potential gene therapy targets.

关键词： dilated cardiomyopathy bioinformatics analysis differentially expressed genes

An Improved Room-Temperature Silicon Terahertz Photodetector on Sapphire Substrates

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

Chinese Physics Letters 2019年第9期36卷 87-90页

作者： Xue-Hui Lu Cheng-Bin Jing Lian-wei wang Jun-Hao Chu Key Laboratory of Polar Materials and Devices(Ministry of Ed ucation) Institute of Functional MaterialsDepartment of MaterialsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241 Shanghai Institute of Jn elligen'Electronics&SystemsFudan UniversityShanghai 200433 State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083

We design and fabricate a good performance silicon photoconductive terahertz detector on sapphire substrates at room *** best voltage responsivity of the detector is 6679 V/W at frequency 300 GHz as well as low voltage noise of 3.8 nV/Hz1/2 for noise equivalent power 0.57 pW/Hz1/*** measured response time of the device is about 9μs,demonstrating that the detector has a speed of>110 *** achieved good performance,together with large detector size(acceptance area is 3μm×160μm),simple structure,easy manufacturing method,compatibility with mature silicon technology,and suitability for large-scale fabrication of imaging arrays provide a promising approach to the development of sensitive terahertz room-temperature detectors.

关键词： Sapphire

The Influence of Different Solar System Planetary Ephemerides on Pulsar Timing

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第8期24卷 85-99页

作者： Jian-Peng Dai wei Han Na wang School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China

Pulsar timing offers a comprehensive avenue for exploring diverse topics in physics and *** solar system planetary ephemeris is crucial for pulsar timing as it provides the positions and velocities of solar system planets including the ***,it is inevitable that inherent inconsistencies exist in these *** between various ephemerides can significantly impact pulsar timing and parameter ***,pulsar timing highly depends on the JPL DE ephemeris,for instance,the Pulsar Timing Array data analysis predominantly utilizes *** this study,we examine inconsistencies across various ephemeris series,including JPL DE,EPM,and ***,discrepancies emerge particularly between the current ephemeris DE436 and the earliest released ephemeris DE200,as well as the most recent ephemerides,e.g.,DE440,INPOP21A,and *** detailed analysis of the effects of ephemeris on geometric correction procedures for the conversion of measured topocentric times of arrival is presented in this *** researches reveal that variations in the Roemer delays across different ephemerides lead to distinct *** timing residuals and the fact that these discrepancies can be readily incorporated into the subsequent pulsar parameters,leading to inconsistent fitting estimates,suggest that the influence of errors in the ephemeris on the timing process might currently be underappreciated.

关键词： (stars)pulsars general-Planetary Systems-time-ephemerides

The Changes of Histone Methylation Induced by Adolescent Social Stress Regulate the Resting-State Activity in mPFC

在线全文

学校读者我要写书评

暂无评论

Research 2024年第3期2023卷 273-283页

作者： Jiesi wang wei Zhang Hang Xu Bart Ellenbroek Jiajie Dai Li wang Chaogan Yan weiwen wang CAS Key Laboratory of Mental Health Institute of PsychologyChinese Academy of SciencesBeijing.China Department of Psychology University of Chinese Academy of SciencesBeijingChina School of Psychology Victoria University of WellingtonKelburnWellington 6012New Zealand CAS Key Laboratory of Behavioral Science Institute of PsychologyChinese Academy of SciencesBeijingChina.

Early-life stress can lead to sustained alterations in regional resting-state brain functions, but the underlying molecular mechanism remains unclear. Stress can also induce sustained changes in epigenetic modifications across brain regions, which are not limited to a few genes;rather, they often tend to produce global levels of change. The functional implication of these changes also remains to be elucidated. We hypothesize that global epigenetic changes may partly modulate the resting-state functions of brain regions to influence behavior. To test this hypothesis, we used an adolescent social stress (ASS) model in mice and examined the relationship between epigenetic modifications and regional resting-state brain activity using resting-state functional magnetic resonance imaging (rs-fMRI). The results showed that, compared to the control mice, the stressed mice showed increased anxiety and social avoidance behaviors and greater levels of dimethylation of histone H3 at lysine 9 (H3K9me2) in the medial prefrontal cortex (mPFC). In addition, the resting-state activity represented by the amplitude of low-frequency fluctuation (ALFF) was significantly lower in the mPFC of stressed mice. To verify the relationship of H3K9me2 and ALFF, the specific inhibition of H3Kme2 was performed by using the drug UNC0642, which reversed the anxiety behavior induced by ASS and significantly increase the ALFF value of mPFC in both normal and ASS animals. Our study is the first to report an association between histone modifications and rs-fMRI findings, providing a new perspective for understanding of the significance of regional brain epigenetic changes and a possible molecular explanation for rs-fMRI findings.

关键词： sustained mPFC alterations

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

反应堆瞬发γ活化成像技术研究进展

中国无机分析化学 2024年第6期14卷 685-697页

作者：王唯姚永刚肖才锦赵梁许小雨李玉庆李天富陈东风中国原子能科学研究院北京102413

瞬发γ活化成像技术(Prompt Gamma Activation Imaging,PGAI)是基于瞬发γ中子活化分析技术(Prompt Gamma Neutron Activation Analysis,PGAA)的一种新型元素成像技术,具有PGAA非破坏性、高灵敏度的多元素分析特点,同时可研究大体积样... 详细信息

瞬发γ活化成像技术(Prompt Gamma Activation Imaging,PGAI)是基于瞬发γ中子活化分析技术(Prompt Gamma Neutron Activation Analysis,PGAA)的一种新型元素成像技术,具有PGAA非破坏性、高灵敏度的多元素分析特点,同时可研究大体积样品内元素含量的三维分布情况。与移动中子源(如同位素中子源、加速器中子源)相比,反应堆中子源具有高通量的冷/热中子,因此,基于反应堆中子源的PGAI装置具有更加广阔的应用前景。鉴于PGAI技术的重要性,主要介绍了PGAI技术原理和测量方法、列举了国内外具有代表性的PGAI装置及特点,并指出当前PGAI技术研究现状与应用进展。其中,与中子层析成像(Neutron Tomography,NT)结合的PGAI是目前研究的重点。随着国内高通量中子反应堆的持续稳定运行以及PGAI装置的建立和技术发展,相信未来PGAI技术能在我国更多领域得到广泛和深入应用。

关键词：瞬发γ活化成像瞬发γ中子活化分析中子层析成像图像重建反应堆中子源

低温环境下液体速凝剂的适应性及强度增强机理研究

在线全文

学校读者我要写书评

暂无评论

硅酸盐通报 2024年第1期43卷 61-70页

作者：杜爽王伟乔敏曾鲁平赵爽陈俊松吴庆勇朱伯淞江苏苏博特新材料股份有限公司高性能土木工程材料国家重点实验室南京211103

速凝剂广泛应用于喷射混凝土中,可实现混凝土的快速凝结硬化。本文研究了碱性和无碱液体速凝剂在20和5℃环境下的促凝机理和强度增强规律,并结合水化热、XRD、TG和SEM等测试手段,分析了不同类型速凝剂对水泥水化进程和促凝机理的影响。... 详细信息

速凝剂广泛应用于喷射混凝土中,可实现混凝土的快速凝结硬化。本文研究了碱性和无碱液体速凝剂在20和5℃环境下的促凝机理和强度增强规律,并结合水化热、XRD、TG和SEM等测试手段,分析了不同类型速凝剂对水泥水化进程和促凝机理的影响。结果表明:当无碱速凝剂掺量为8%(质量分数,下同)和有碱速凝剂掺量为5%时即可满足《喷射混凝土用速凝剂》(GB/T 35159—2017)中初凝时间不大于5 min,终凝时间不大于12 min的要求;低温(5℃)环境会延缓净浆终凝时间,降低掺速凝剂砂浆的早期强度;无碱速凝剂在20和5℃环境下的28 d强度仍在增加,而有碱速凝剂出现强度倒缩现象。高浓硫酸铝、常规硫酸铝、含氢氟酸类速凝剂均是通过水化生成钙矾石(AFt)和水化硅酸钙(C-S-H)凝胶等水化产物来提供早期强度和缩短凝结时间,而偏铝酸钠类速凝剂则是通过消耗石膏和生成水化铝酸钙(C-A-H)凝胶和氢氧化钙(CH)等水化产物来提供早期强度和缩短凝结时间;低温环境会使高浓硫酸铝、常规硫酸铝、含氢氟酸类速凝剂作用的水泥中AFt和C-S-H等水化产物含量减少,使强度下降。而掺偏铝酸钠类速凝剂的水泥水化产物受低温环境的影响,导致CH的生成量减少,减弱了CH对后期强度的不利影响。

关键词：速凝剂温度水化抗压强度微观形貌促凝机理

月季花标准汤剂UPLC指纹图谱及多指标成分定量研究

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

天然产物研究与开发 2024年第3期36卷 423-432,443页

作者：何民友王利伟周湘媛刘晓霞李振雨陈向东孙冬梅广东一方制药有限公司广东省中药配方颗粒企业重点实验室佛山528244

建立月季花(Rosae Chinensis Flos)标准汤剂UPLC指纹图谱,为月季花标准汤剂质量控制提供参考。通过超高效液相色谱法(UPLC)建立20批月季花标准汤剂指纹图谱,共有色谱峰通过质谱分析和对照品比对进行指认,采用相似度评价结合化学模式识... 详细信息

建立月季花(Rosae Chinensis Flos)标准汤剂UPLC指纹图谱,为月季花标准汤剂质量控制提供参考。通过超高效液相色谱法(UPLC)建立20批月季花标准汤剂指纹图谱,共有色谱峰通过质谱分析和对照品比对进行指认,采用相似度评价结合化学模式识别方法探究影响月季花标准汤剂质量的特征性成分,并同时测定主要色谱峰中的8个成分的含量。结果建立了月季花标准汤剂的UPLC指纹图谱,并标定出15个共有峰,20批样品相似度在0.983~0.999;聚类分析(HCA)和主成分分析(PCA)将样品分为4类,结合偏最小二乘法判别分析(OPLS-DA)筛选出11个标志性化合物,通过质谱鉴定和对照品确认了8个成分;含量测定结果显示,河南省周口市的月季花标准汤剂没食子酸、鞣花酸、异槲皮苷、紫云英苷和槲皮素含量显著高于其他产地的样品。研究建立的月季花标准汤剂分析方法稳定可行,方法重现性好,能够为月季花标准汤相关制剂开发、质量标准研究提供参考。

关键词：月季花标准汤剂指纹图谱化学计量学质量标准