检索结果-南通市图书馆

峨眉山大火成岩省地壳横波速度结构特征及其动力学意义

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2017年第9期60卷 3338-3351页

作者：郭希陈赟李士东邓阳凡徐涛李玮谭萍中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029 中国科学院大学北京100049 中国石油天然气股份有限公司华北油田分公司勘探开发研究院河北任丘062552 中国科学院广州地球化学研究所同位素地球化学国家重点实验室广州510640

峨眉山大火成岩省是我国境内最早获得国际学术界广泛认可的大火成岩省,对于认识地幔柱形成与作用机理、生物与环境演化、资源富集与成矿机制等具有重要意义.本文利用峨眉山大火成岩省宽频带地震台阵(COMPASS-EliP)以及云南、四川区域地... 详细信息

峨眉山大火成岩省是我国境内最早获得国际学术界广泛认可的大火成岩省,对于认识地幔柱形成与作用机理、生物与环境演化、资源富集与成矿机制等具有重要意义.本文利用峨眉山大火成岩省宽频带地震台阵(COMPASS-EliP)以及云南、四川区域地震台网的部分台站资料,基于分格加权叠加策略实现接收函数和面波频散在信息来源和分辨尺度方面的协同;进而开展联合反演,重建了峨眉山大火成岩省关键剖面下方的地壳横波速度结构.研究结果显示:研究区地壳平均S波速度,沿剖面呈现自西向东先增大后减小的分带性,内带中、下地壳速度较高,尤其是下地壳存在明显的高速异常(V_s约3.8~4.2 km·s^(-1))丽江—小金河断裂带和水城—紫云断裂带的东西两侧,中上地壳存在低速层(V_s约3.3 km·s^(-1)),尤其是水城—紫云断裂带东西两侧的中地壳低速层尤为明显.结合本文以及现有的系列研究结果,进一步确认内带中、下地壳高速对应二叠纪古地幔柱作用的遗迹,大规模岩浆的底侵和内侵,不仅改造了滇中块体的地壳结构和组分,而且也改变了地壳的流变强度,进而对现今青藏高原东南缘的深部过程产生了深远影响.

关键词：峨眉山大火成岩省青藏高原东南缘古地幔柱横波速度接收函数环境噪声

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing chen Chao Wu xiaoling liu Biao Meng Tao chen Yu Han Jun Wang Shibo xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis

Engineering atomic Rb-N configurations to tune radical pathways for highly selective photocatalytic H2O2 synthesis coupled with biomass valorization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 215-225页

作者： Jiaye li Shuang Pan Yihuang chen Qiong liu College of Chemistry and Materials Engineering Wenzhou University Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology (China) Institute of Analysis Guangdong Academy of Sciences (China National Analytical CenterGuangzhou)

Photocatalytic oxygen reduction for hydrogen peroxide （H2O2） synthesis presents a green and costeffective production ***,achieving highly selective H2O2synthesis remains challenging,necessitating precise control over free radical reaction pathways and minimizing undesirable oxidative ***,we report for the visible light-driven simultaneous co-photocatalytic reduction of O2to H2O2and oxidation of biomass using the atomic rubidium-nitride modified carbon nitride（CNRb）.The optimized CNRb catalyst demonstrates a record photoreduction rate of 8.01 mM h-1for H2O2generation and photooxidation rate of 3.75 mM h-1for furfuryl alcohol to furoic acid,achieving a remarkable solar-to-chemical conversion （SCC） efficiency of up to 2.27%.Experimental characterizations and DFT calculation disclosed that the introducing atomic Rb–N configurations allows for the high-selective generation of superoxide radicals while suppressing hydroxyl free radical *** is because the Rb–N serves as the new alternative site to perceive a stronger connection position for O2adsorption and reinforce the capability to extract protons,thereby triggering a high selective redox product *** study holds great potential in precisely regulating reactive radical processes at the atomic level,thereby paving the way for efficient synthesis of H2O2coupled with biomass valorization.

关键词： Atomic economy Radical pathway regulation Rubidium atom coordination Biomass valorization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

湾流及其邻近海域中尺度涡统计特征分析

解放军理工大学学报（自然科学版） 2016年第5期17卷 459-466页

作者：洪森胡冬陈希李妍毛科峰解放军理工大学气象海洋学院解放军31010部队

为了得到中尺度涡的特征,综合利用1993-2012年共20a的卫星高度计资料及Argo浮标资料等,对湾流及其邻近海域的中尺度涡特征进行统计,并采用合成方法对涡的三维结构特征进行分析。结果表明:该海域气旋涡(CE)和反气旋涡(AE)的平均生命史及... 详细信息

为了得到中尺度涡的特征,综合利用1993-2012年共20a的卫星高度计资料及Argo浮标资料等,对湾流及其邻近海域的中尺度涡特征进行统计,并采用合成方法对涡的三维结构特征进行分析。结果表明:该海域气旋涡(CE)和反气旋涡(AE)的平均生命史及平均半径十分相近;湾流主体段与延续段的涡动能(EKE)、涡能量密度(EI)和涡度明显大于其他区域,气旋涡平均强度大于反气旋涡;对于生命周期内的长周期涡,半径和EKE的变化幅度较大,EI和涡度的变化较小;涡以西向移动为主,平均移速3.2cm/s;长周期气旋涡和反气旋涡均具有向赤道移动的特征;在垂直剖面上,气旋涡(反气旋涡)存在2个温度负(正)异常结构和上下2个盐度负(正)异常结构,涡对海水温盐的垂向影响可达1km以上。

关键词：湾流中尺度涡统计特征合成结构 Argo

在线全文

学校读者我要写书评

暂无评论

环境一号卫星影像中水体信息提取方法研究

科学技术与工程 2012年第13期20卷 3051-3056页

作者：王秋燕陈仁喜徐佳陈犀力河海大学地球科学与工程学院南京210098 南京地铁运营分公司南京210012

从卫星遥感影像中快速、准确地提取水体信息已经成为水资源调查、水资源宏观监测、城市绿化度调查及湿地保护的重要手段。针对HJ—1A/B(中国环境一号卫星)影像与Landsat ETM(美国陆地探测卫星)影像的相似性,利用水体特有的光谱特性,采... 详细信息

从卫星遥感影像中快速、准确地提取水体信息已经成为水资源调查、水资源宏观监测、城市绿化度调查及湿地保护的重要手段。针对HJ—1A/B(中国环境一号卫星)影像与Landsat ETM(美国陆地探测卫星)影像的相似性,利用水体特有的光谱特性,采用多种水体提取方法对HJ—1A/B影像中水体信息进行了快速提取,并比较了两种影像水体提取结果。总结了在环境一号卫星影像中进行水体提取的精度影响因子。分析了传感器、分辨率、水体提取模型对水体提取的影响。

关键词： HJ—1A/B ETM 水体提取

FUBP3 mediates the amyloid-β-induced neuronal NLRP3 expression

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 2068-2083页

作者： Jing Yao Yuan li xi liu Wenping liang Yu li liyong Wu Zhe Wang Weihong Song The National Clinical Research Center for Geriatric Disease Xuanwu HospitalCapital Medical UniversityBeijingChina Department of Neurology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina Department of Neurosurgery Xuanwu HospitalCapital Medical UniversityBeijingChina Department of Pediatrics The Second Affiliated Hospital and Yuying Children’s HospitalKey Laboratory of Alzheimer’s Disease of Zhejiang ProvinceInstitute of AgingWenzhou Medical UniversityWenzhouZhejiang ProvinceChina Oujiang Laboratory(Zhejiang Laboratory for Regenerative Medicine Visionand Brain Health)WenzhouZhejiang ProvinceChina

Alzheimer's disease is characterized by deposition of amyloid-β,which forms extracellular neuritic plaques,and accumulation of hyperphosphorylated tau,which aggregates to form intraneuronal neurofibrillary tangles,in the *** NLRP3 inflammasome may play a role in the transition from amyloid-βdeposition to tau phosphorylation and *** NLRP3 is primarily found in brain microglia,and tau is predominantly located in neurons,it has been suggested that NLRP3 expressed by microglia indirectly triggers tau phosphorylation by upregulating the expression of pro-inflammatory ***,we found that neurons also express NLRP3 in vitro and in vivo,and that neuronal NLRP3 regulates tau *** biochemical methods,we mapped the minimal NLRP3 promoter and identified FUBP3 as a transcription factor regulating NLRP3 expression in *** primary neurons and the neuroblastoma cell line Neuro2A,FUBP3 is required for endogenous NLRP3 expression and tau phosphorylation only when amyloid-βis *** the brains of aged wild-type mice and a mouse model of Alzheimer's disease,FUBP3 expression was markedly increased in cortical *** analysis suggested that FUBP3 plays a role in neuron-mediated immune *** also found that FUBP3 trimmed the 5′end of DNA fragments that it bound,implying that FUBP3 functions in stress-induced *** findings suggest that neuronal NLRP3 may be more directly involved in the amyloid-β-to–phospho-tau transition than microglial NLRP3,and that amyloid-βfundamentally alters the regulatory mechanism of NLRP3 expression in *** that FUBP3 was only expressed at low levels in young wild-type mice and was strongly upregulated in the brains of aged mice and Alzheimer's disease mice,FUBP3 could be a safe therapeutic target for preventing Alzheimer's disease progression.

关键词： 5′end trimming Alzheimer's disease amyloid-beta amyloid-β-dependent transcription FUBP3 inflammasome inflammation neuron NLRP3 tau transcription factor

在线全文

学校读者我要写书评

暂无评论

羊绒/棉牛仔布淀粉酶退浆工艺的优化

纺织科技进展 2007年第3期 61-63页

作者：陈莉西安工程大学陕西西安710048

对羊绒/棉牛仔布进行酶退浆,探讨了淀粉酶的浓度、处理温度、pH值、处理时间等因素对退浆效果的影响,通过正交实验得出了羊绒/棉牛仔布淀粉酶退浆的优化工艺。

关键词：牛仔布淀粉酶退浆

Description of Three New Record Species of Coslenchus from China（Secernentea,Tylenchida）

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Description of Three New Record Species of Coslenchus from C...

Cyano migration-mediated radical-polar crossover cyclopropanation

中国植物病理学会2009年学术年会

作者： LUO Xuan~* DUAN Yu-xi~* chen li-jie (Nematology Institute of Northern China,Shenyang Agriculture University,Shenyang 110161,China)

＜正＞Three new record species:Coslenchus alainatus、Coslenchus franklinae and Coslenchus indicus belonging to the genus Coslenchus were found in soil samples collected from the rhizosphere of Glycine max and Pinus olgensis in north *** of Coslenchus alainatus was characterize by body of medium length,annules 2.4～2.6μm;lateral fields memebranes lacking,postvulval uterine sac very short;male no *** was distinguished from the lateral fields with four incisures,inner ones of which are close together;lateral vulval membranes conspicuous,two to three annules long;postvulval uterine sac rudimentary,less than 1/4 body-width long or absent;tail regularly tapering,annulated up to tip;male is shorter than *** was found female with lateral fields with three incisures;vulval flaps distinct,postvulval uterine sac 1/2 to 1 vulval body diameter long;tail varying in length from 7.8 to 9.1 anal body diameters,terminus rounded;male no found.

关键词： Tylenchida Tylenchidae Aglenchus new record species China.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 241-248页

作者： Ziqiang Wang Yasu chen Jie li chen Zhu Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials ScienceSoochow University Frontiers Science Center for Transformative Molecules Zhangjiang Institute for Advanced Study and Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Shanghai Jiao Tong University

We report a novel cyano migration-mediated radical-polar crossover process, whereby both the sulfonylcyanation of aliphatic alkenes and the formation of cyclopropanes are concurrently achieved. This transformation yields a diverse array of multisubstituted cyclopropanes under mild photocatalytic conditions. Mechanistic studies elucidate that the reaction proceeds via intramolecular nucleophilic substitution, leading to the formation of the cyclopropane derivatives.

关键词：

同方期刊数据库