检索结果-南通市图书馆

Stress responses of plants through transcriptome plasticity by mRNA alternative polyadenylation

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

Molecular Horticulture 2023年第1期3卷 127-140页

作者： Jiawen Zhou qingshun quinn li Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem College of the Environment and EcologyXiamen UniversityXiamen 361102FujianChina Biomedical Sciences College of Dental MedicineWestern University of Health SciencesPomonaCA 91766USA

The sessile nature of plants confines their responsiveness to changing environmental *** expression regulation becomes a paramount mechanism for plants to adjust their physiological and morphological *** polyadenylation(APA)is known for its capacity to augment transcriptome diversity and plasticity,thereby furnishing an additional set of tools for modulating gene *** has also been demonstrated to exhibit intimate associations with plant stress *** this study,we review APA dynamic features and consequences in plants subjected to both biotic and abiotic *** stresses include adverse environmental stresses,and pathogenic attacks,such as cadmium toxicity,high salt,hypoxia,oxidative stress,cold,heat shock,along with bacterial,fungal,and viral *** analyzed the overarching research framework employed to elucidate plant APA response and the alignment of polyadenylation site transitions with the modulation of gene expression levels within the ambit of each stress *** also proposed a general APA model where transacting factors,including poly(A)factors,epigenetic regulators,RNA m6A modification factors,and phase separation proteins,assume pivotal roles in APA related transcriptome plasticity during stress response in plants.

关键词： Alternative polyadenylation RNA processing Transcriptome diversity Biotic and abiotic stress Stress response

New indices to balanceα-diversity against tree size inequality

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

Journal of Forestry Research 2024年第1期35卷 229-237页

作者： li Zhang Brady K.quinn Cang Hui Meng lian Johan Gielis Jie Gao Peijian Shi College of Ecology and Environment Bamboo Research InstituteNanjing Forestry University159 Longpan RoadNanjing 210037People’s Republic of China Fisheries and Oceans Canada Andrews Biological Station125 Marine Science DriveSt.AndrewsNB E5B 0E4Canada Department of Mathematical Sciences Centre for Invasion BiologyStellenbosch UniversityMatieland 7602South Africa Mathematical and Physical Biosciences African Institute for Mathematical SciencesCape Town 7945South Africa Department of Biosciences Engineering University of AntwerpB-2020 AntwerpBelgium College of life Science Xinjiang Normal University102 Xinyi RoadUrumqi 830054People’s Republic of China

The number and composition of species in a community can be quantified withα-diversity indices,including species richness(R),Simpson’s index(D),and the Shannon-Wiener index(H΄).In forest communities,there are large variations in tree size among species and individu-als of the same species,which result in differences in eco-logical processes and ecosystem ***,tree size inequality(TSI)has been largely neglected in studies using the available diversity *** TSI in the diameter at breast height(DBH)data for each of 99920 m×20 m forest census quadrats was quantified using the Gini index(GI),a measure of the inequality of size *** generalized performance equation was used to describe the rotated and right-shifted Lorenz curve of the cumulative proportion of DBH and the cumulative proportion of number of trees per *** also examined the relationships ofα-diversity indices with the GI using correlation *** generalized performance equation effectively described the rotated and right-shifted Lorenz curve of DBH distributions,with most root-mean-square errors(990 out of 999 quadrats)beinglimate change.

关键词： Diameter at breast height(DBH) Gini index Shannon-Wiener index Simpson’s index Quadrat Tree size

基于U2net神经网络的混凝土表面裂缝检测研究

在线全文

学校读者我要写书评

暂无评论

青海大学学报 2024年第3期42卷 77-85页

作者：李晏兴杨青顺青海省建筑节能材料与工程安全重点实验室青海大学土木水利工程学院青海西宁810016

本研究提出了一种基于U2net神经网络的改进网络AM-U2net,以实现对混凝土结构裂缝更为准确和快速地检测。首先,在原U2net网络的跳跃连接部分施加注意力机制,在网络结构的上层部分添加CBAM注意力模块,下层部分添加ECA注意力模块。然后,引... 详细信息

本研究提出了一种基于U2net神经网络的改进网络AM-U2net,以实现对混凝土结构裂缝更为准确和快速地检测。首先,在原U2net网络的跳跃连接部分施加注意力机制,在网络结构的上层部分添加CBAM注意力模块,下层部分添加ECA注意力模块。然后,引入Mish激活函数,提出一种AM-U2net网络。结果显示:改进网络AM-U2net的性能要优于对比网络Unet、Unet++和原U2net,准确率、精确率、召回率和f1score分别达到99.1%、64.2%、65.4%和64.8%。最后,采用骨架线的方法对模型输出的混凝土裂缝预测图像,在像素级别上标注计算裂缝的长宽属性,使得模型预测裂缝的结果能够反映出混凝土裂缝的一些基本属性。本研究提出的改进算法在混凝土裂缝识别任务中具有较好的表现,为裂缝检测的后续研究提供思路。

关键词：混凝土裂缝 U2net 注意力机制激活函数骨架线

渤海海域明下段岩性油藏油柱高度分布规律及影响因素

在线全文

学校读者我要写书评

暂无评论

中国海上油气 2024年第4期36卷 37-48页

作者：王德英刘庆顺汤国民刘泽宇陶莉中海石油(中国)有限公司天津分公司天津300459

渤海海域明下段岩性油藏特征、储量规模差异大,油柱高度作为油藏评价的关键参数,直接影响油藏储量规模,其分布规律及影响因素认识不清。基于渤海海域约460个明下段岩性油藏勘探开发数据,在充分了解地质背景的基础上,利用统计手段并结合... 详细信息

渤海海域明下段岩性油藏特征、储量规模差异大,油柱高度作为油藏评价的关键参数,直接影响油藏储量规模,其分布规律及影响因素认识不清。基于渤海海域约460个明下段岩性油藏勘探开发数据,在充分了解地质背景的基础上,利用统计手段并结合地球化学证据,厘清了浅层明下段岩性油藏油柱高度空间展布规律,通过进一步分析油柱高度与油气充注强度、区域盖层展布、圈闭类型和断砂耦合程度等成藏要素关系,明确了油柱高度影响因素。结果表明:①受油气充注强度控制,明下段岩性油藏油柱高度平面上具有“凸起区小、凹陷区大”特征,平均油柱高度相差约2倍;②受区域盖层控制,纵向上具有“盖层之上油柱高度小、盖层之下油柱高度大”特征,下部Ⅲ/Ⅳ油组平均油柱高度为Ⅰ/Ⅱ油组约2倍;③受油气汇聚部位与侧封保存能力控制,高点依靠断裂侧封油藏油柱高度普遍高于岩性尖灭油藏的油柱高度,平均油柱高度相差约2.5倍;④明下段油气成藏受断砂耦合程度影响,但凸起区与凹陷区断裂油气运移能力差异较大,凸起区切穿馆陶组区域油气输导层断裂可起到运移作用,而凹陷区切穿深部汇聚脊的断裂才可作为有效的油源断裂。渤海海域明下段岩性油藏油柱高度分布规律及影响因素,对后续岩性油藏价值勘探、精细勘探具有借鉴意义。

关键词：岩性油藏油柱高度明下段分布规律渤海海域

在线全文

学校读者我要写书评

暂无评论

锂离子电池撞击测试方法及参数研究

电池 2024年第5期54卷 668-671页

作者：赵家义许庆顺宁德时代新能源科技股份有限公司福建宁德352100

高能量密度的锂离子电池在使用和运输中,碰撞难以避免,品质控制尤为重要。电池受物理撞击后可能有内短路,为检验成品电池综合品质,需在出厂前进行可靠性检测。介绍可靠性检测中,八角转鼓设备的方法及合理的参数设置。借助运动仿真模拟... 详细信息

高能量密度的锂离子电池在使用和运输中,碰撞难以避免,品质控制尤为重要。电池受物理撞击后可能有内短路,为检验成品电池综合品质,需在出厂前进行可靠性检测。介绍可靠性检测中,八角转鼓设备的方法及合理的参数设置。借助运动仿真模拟电池在转鼓中的撞击参数,收集测试后电池的数据,以判断品质是否达到六西格玛(6σ)的工程能力。

关键词：锂离子电池撞击八角转鼓设备内短路六西格玛(6σ)

Temporal and spatial variation characteristics of extreme precipitation on the Loess Plateau of China facing the precipitation process

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

Journal of Arid Land 2023年第4期15卷 439-459页

作者： ZHANG Yixin li Peng XU Guoce MIN Zhiqiang li qingshun li Zhanbin WANG Bin CHEN Yiting State Key Laboratory of Eco-Hydraulic in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions Northwest Survey and Planning Institute of National Forestry and Grassland AdministrationXi'an 710048China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China

The preceding and succeeding precipitation(PSP)often act together with extreme precipitation(EP),in turn,causing floods,which is an objective component that is often overlooked with regard to summer flood hazards in the arid region of Northwest *** this study,event-based extreme precipitation(EEP)was defined as continuous precipitation that includes at least one day of *** analyzed the spatiotemporal variation characteristics of four EEP types(front EEP,late EEP,balanced EEP,and single day EEP)across the Loess Plateau(LP)based on data acquired from 87 meteorological stations from 1960 to *** on the LP basically maintained a spatial pattern of"low in the northwest region and high in the southeast region",and EP over the last 10 a increased *** cumulative precipitation percentage of single day EEP was 34%and was dominant for 60 a,while the cumulative precipitation percentage of front,late,and balanced EEP types associated with PSP accounted for 66%,which confirms to the connotation of *** cumulative frequencies of front and late EEP types were 23%and 21%,respectively,while the cumulative frequency of balanced EEP had the lowest value at only 13%.Moreover,global warming could lead to more single day EEP across the LP,and continuous EEP could increase in the northwestern region and decrease in the eastern region in the *** concept of process-oriented EP could facilitate further exploration of disaster-causing processes associated with different types of EP,and provide a theoretical basis for deriving precipitation disaster chains and construction of disaster cluster characteristics.

关键词： temporal and spatial variation climate change extreme precipitation(EP) event-based extreme precipitation(EEP) Loess Plateau

Supermassive black holes triggered by QCD axion bubbles

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第5期76卷 134-139页

作者： Hai-Jun li Ying-Quan Peng Wei Chao Yu-Feng Zhou Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Center for Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical Physics Asia-Pacific Beijing/HangzhouChina

Supermassive black holes(SMBHs)are ubiquitous in the center of galaxies,although the origin of their massive seeds is still *** this paper,we investigate the formation of SMBHs from the quantum chromodynamics(QCD)axion *** this case,primordial black holes(PBHs)are considered as the seeds of SMBHs,which are generated from the QCD axion bubbles due to an explicit Peccei–quinn(PQ)symmetry breaking after *** QCD axion bubbles are formed when the QCD axion starts to oscillate during the QCD phase *** consider a general case in which the axion bubbles are formed with the bubble effective angle θ_(eff)∈(0,π],leading to the minimum PBH mass∼■(10^(4)−10^(7))M⊙for the axion decay constant f_(a)∼■(10^(16))*** PBHs at this mass region may account for the seeds of SMBHs.

关键词： supermassive black holes primordial black holes quantum chromodynamics axion

Overexpressing dominant negative MyD88 induces cardiac dysfunction in transgenic mice

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第31期55卷 3569-3575页

作者： CHEN WeiQian li ChuanFu JIANG Xuan RUAN HaiBin QI Xin liU li ZHAO qingshun GAO Xiang Key Laboratory of Model Animal for Disease Study of Ministry of Education Model Animal Research Center Nanjing University Nanjing 210061 China Department of Surgery East Tennessee State University Johnson City TN 37614 USA Departments of Gerontology and Cardiology The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China

Myeloid differentiation protein-88(MyD88) is a crucial adaptor protein in the innate immune response.A protective role for MyD88 in normal cardiac function has been proposed in a surgical hypertrophic *** assess the in vivo role of MyD88 in cardiac remodeling,we generated transgenic mice with cardiac-restricted expression of a dominant negative mutant of MyD88(dnMyD88).Surprisingly,dnMyD88 transgenic mice displayed characteristic features of heart failure;including heart weight increase,cardiomyocytes enlargement,interstitial fibrosis,and re-expression of "fetal" *** examination of dnMyD88 hearts revealed dilated chamber volume and reduced cardiac ***88 mice died from heart failure before they were 7 months old,as shown by Kaplan-Meier ***,the heart failure phenotype of dnMyD88 mice was associated with abnormal activation of the Akt/GSK-3β signaling *** data provide the first evidence that normal MyD88 signaling is crucial for maintaining the physiological function of the adult heart.

关键词：转基因小鼠心脏功能功能障碍过量表达显性信号转导通路诱导心肌收缩力

Durable semi-crystalline interphase engineering to stabilize high voltage Ni-rich cathode in dilute ether electrolyte

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 110-117页

作者： Zhuangzhuang Cui Shunqiang Chen qingshun Nian Yecheng li Yawei Chen Bing-Qing Xiong Zihong Wang Zixu He Shuhong Jiao Xiaodi Ren School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiChina

Ethers are promising electrolyte solvents for secondary li metal batteries because of their excellent reduction ***,their oxidation stability has been mostly relying on the high concentration approach,and limited progress has been made on building effective interphase to protect the cathode from the corrosion of the *** this work,we construct a semi-crystalline interfacial layer on the surface of li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)cathode that can achieve improved electrochemical stability in the highly corrosive chemical environment formed by the decomposition of ether *** from traditional brittle crystalline interphases,the optimized semi-crystalline layer with low modulus and high ionic conductivity can effectively relieve electrode strain and maintain the integrity of the interface *** to this design,the continuous oxidation decomposition of ether-based electrolytes could be significantly suppressed and the battery shows outstanding cycling stability(84%capacity retention after 300 cycles).This article provides a solution to address the oxidation instability issue of ether-based electrolytes.

关键词： Cathode/electrolyte interphase Semi-crystalline Ether electrolyte High-voltage cathode li-metal batteries