检索结果-南通市图书馆

East Asian monsoon intensification promoted weathering of the magnesium-rich southern China upper crust and its global significance

引用

science China Earth sciences 2021年第7期64卷 1155-1170页

作者： Yibo yang Albert GAlY Xiaomin FANG Christian FRANCE-lANORD shiming WAN Rongsheng yang Jian ZHANG Ran ZHANG song yang Yunfa MIAO Yudong lIU Chengcheng YE Key laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAs Center for Excellence in Tibetan Plateau Earth sciences Beijing 100101China Centre de Recherches Pétrographiques et Géochimiques UMR7358CNRS-Universitéde LorraineVandoeuvre les Nancy 54500France University of Chinese Academy of sciences Beijing 100049China Key laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key laboratory of Tibetan Environment Changes and land surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

The Oligocene-Miocene boundary Asian climatic reorganization linked to the northward migration of the East Asian monsoon into subtropical China is a potentially important but poorly constrained atmospheric CO_(2) consumption ***,we performed a first-order estimate of the CO_(2) consumption induced by silicate chemical weathering and organic carbon burial in subtropical China related to this climatic *** results show that an increase in long-term CO_(2 )consumption by silicate weathering varies from 0.06×10^(12)to 0.87×10^(12)mol yr^(-1)depending on erosion flux reconstructions,with an~50%contribution of Mg-silicate weathering since the late *** organic carbon burial flux is approximately 25%of the contemporary CO_(2) consumption by silicate *** results highlight the significant role of weathering of the Mg-rich upper continental crust in East China,which would contribute to the rapid decline in atmospheric CO_(2) during the late Oligocene and the Neogene rise in the seawater Mg *** this climatic reorganization was mainly induced by the Tibetan Plateau uplift,our study suggests that the growth of the Himalayan-Tibetan Plateau can lead to indirect modification of the global carbon and magnesium cycles by changing the regional hydrological cycle in areas of East Asia that are tectonically less active.

关键词： Tibetan Plateau late Oligocene silicate weathering Carbon cycle Oceanic Mg cycle

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

基于有限元分析的大理、丽江地区穿斗式木结构山架抗震性能

引用

地震研究 2025年第1期48卷 100-111页

作者：叶阳杨健强明小娜周洋王杰刘绍昌高扬云南省地震局云南昆明650224 中国地震局昆明地震预报研究所云南昆明650224 德宏州防震减灾局云南芒市678400

通过实地调查,分析了大理、丽江地区木结构榫卯结构的配置情况以及二者结构上的差异。为了研究二者的抗震性能与受力特性,通过有限元软件对两个地区的典型穿斗式木结构山架进行低周往复荷载模拟。结果表明:丽江地区穿斗式木结构山架抗... 详细信息

通过实地调查,分析了大理、丽江地区木结构榫卯结构的配置情况以及二者结构上的差异。为了研究二者的抗震性能与受力特性,通过有限元软件对两个地区的典型穿斗式木结构山架进行低周往复荷载模拟。结果表明:丽江地区穿斗式木结构山架抗震性能优于大理地区,两地木结构的薄弱点均在横向构件与纵向构件的榫卯节点处,榫卯节点的薄弱点位于榫头末端,二者的抗侧刚度均不高,易在水平荷载下倾斜。

关键词：穿斗式木结构抗震性能大理丽江有限元分析

来源：

维普期刊数据库

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

KlVFF peptide functionalized nanoparticles capture Aβ_(42) by co-assembly for decreasing cytotoxicity

引用

Chinese Chemical letters 2018年第12期29卷 1811-1814页

作者： Peipei yang Chao yang Kuo Zhang lei Wang Hao Wang CAs Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology (NCNST)

The accumulation of extracellular senile plagues of amyloid β-proteins(Aβ) in the patient brain is one of most important facture in Alzheimer’s disease(AD), which is resulted from abnormal self-assembly of Aβpeptide. Nanoparticles show greatly potential for therapeutic studies due to the sophisticated surface which can mimic the functionality of protein. Herein, we design the bis(pyrene)-lys-leu-Val-Phe-PheGly-poly ethylene glycol(BP-KlVFFGPEG) based nanoparticles, which capture Aβthrough recognition and co-assembly of KlVFF. The resulting co-assemblies show different morphologies, such as large aggregates, nanoparticles and nanofibers corresponding to the different length chain of PEG, leading to different capture efficiencies. The co-assembly strategy shows a decrease of cytotoxicity, potentially for AD treatment.

关键词： Co-assembly Morphology Capture Nanoparticles Aβ

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

Acoustic emission detection of slag performance in coal gasifiers

引用

Chinese Journal of Chemical Engineering 2020年第8期28卷 2200-2207页

作者： Zhengliang Huang Peng Zhang Yao yang Jingyuan sun JingdaiWang Yongrong yang Chenghao Huang Zhixiong Huang College of Chemical and Biological Engineering Zhejiang UniversityZhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyHangzhou 310027China state Key laboratory of Chemical Engineering Hangzhou 310027China sinopec Group Anqing BranchAnqing 246000China

This work first investigated the detection of slags,slag pool liquid level,and slag accumulation height in laboratory scale based on acoustic emission(AE)detection,and further tried the feasibility of this method in an industrial scale coal *** show that the energy and variance of acoustic signals can realize the accurate detection of large slag(criterion:E>1.5 E0,s>1.2 s0),and the average relative error is only 0.28%.The acoustic energy in the frequency range of 20–40 k Hz is defined as the characteristic energy,which can realize the accurate detection of slag accumulation height and slag pool liquid level,and the average relative error is only 3.94%.Furthermore,AE detection also realize accurate detection of large slag in an industrial scale gasifier and the acoustic signals at slag screen can be used to realize the early warning of the slag collapse(5 h earlier).

关键词： Acoustic emission(AE)detection slag pool liquid level slag accumulation height Early warning

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

A look into the past, present and future potential distributions of Talinopsis frutescens, a North American endemic lineage closely related to Cactaceae

引用

Journal of Arid land 2020年第1期12卷 104-114页

作者： Mónica I MIGUEl-VÁZQUEZ Yasser s lÓPEZ DE OlMOs R Gilberto OCAMPO Department of Biology Basic Sciences CenterAutonomous University of Aguascalientes940 University AvenueAguascalientes 20130Mexico Biological and Health sciences PhD Program Department of BiologyBiological and Health Sciences DivisionAutonomous Metropolitan UniversityIztapalapa 09340Mexico

Talinopsis frutescens(Anacampserotaceae,a family that is close related to Cactaceae)is a succulent species endemic to North *** aim of this study was to explore,using Ecological Niche Modeling(ENM),changes in potential distribution ranges considering different climate scenarios:past conditions during the last Inter Glacial(lIG)and the last Glacial Maximum(lGM),the present and projections for 2070(RCP 2.6 to 8.5).A pattern of contraction is observed during the lIG,which agrees with other studies focused in species from arid *** pattern was followed by a migration towards the south during the lGM and a possible recent expansion to the north as is observed in the present *** future projections show the same contraction and fragmentation patterns,resulting in three discontinuous areas:the northern part of the Chihuahuan Desert,the southern-central part of the Mexican Plateau,and the smallest one in the Tehuacán-Cuicatlán *** projections for future scenarios agree with other studies and support that global climate change tends to alter the current distribution of arid environment species.

关键词： Anacampserotaceae Caryophyllales ecological niche modeling succulent plants potential distribution

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

A Novel Diamine,4'-Phenyiphenyi 4-(3",5"-Diaminobenzoyioxy)-benzoate and longer side-chain Polyimide

引用

Chinese Chemical letters 2005年第9期16卷 1151-1154页

作者： Jin yang li Gang REN Xiang yang lIU Yi GU state Key laboratory of Polymeric Materials Engineering College of Polymer Science and Engineering Sichuan University Chengdu 610065

This is a part of our systematic research work on polyimides with mesogenic unit side chain. In this study, a new 4＇-phenylpbenyl 4-（3＂,5＂-diaminobenzoyloxy）benzoate and polyimide were synthesized, and characterized by FTIR, ^1H-NMR, inherent viscosity, mechanical properties, and solubility measurements. The diamine composed with mesogenic unit aryl ester groups and bipbenyl group with longer l/D ratio, was synthesized by two key steps. Firstly, the hydroxy group of 4-hydroxybenzoic acid was protected by acetoxy group for avoiding self- polymerization of 4-hydroxybenzoic acid, and then selectively hydrolyzed after esterification of carboxyl. secondly, a selective catalysis hydrogenation was adopted to prevent the aryl ester from deoxidation. Based on this diamine, a novel polyimide was prepared by polycondensation of 4＇-phenylphenyl 4-（3＂, 5＂-diaminobenzoyloxy）benzoate and 4-aminophenyl ether（ODA） with 4, 4＇-oxydiphthalic anhydride（ODPA） in N-methyl-2-pyrrolidone （NMP）. The resulting polyimide with longer side chain showed better solubility and more regular structure. Its inherent viscosity is lower than that without side chains, but its modulus and strength not only maintained, even improved.

关键词： Polyimide film materials side-chain synthesis

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

Clinical investigation of surgery for intermittent exotropia

引用

Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2008年第6期9卷 470-473页

作者： Chong-qing yang Ye sHEN yang-shun GU Wei HAN Department of Ophthalmology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective： To investigate the time and postoperative binocular vision of strabismus surgery for children with intermittent exotropia （X（T））. Methods： A retrospective investigation was conducted in 80 child patients with intermittent exotropia. Pre- and postoperative angles of deviation fixating at near （33 cm） and distant targets （6 m） were measured with the prolonged alternate cover testing. The binocular function was assessed with synoptophore. Twenty-one patients took the postoperative synoptophore exercise. Results：（1） A week after surgery, 96.2% of the 80 patients had binocular normotopia, while a year after surgery, 91.3% of the 80 patients had binocular normotopia; （2） Preoperatively, 58 patients had near stereoacuity, while postoperatively, 72 patients achieved near stereoacuity （P〈0.05）; （3） Preoperatively, 64 patients had Grade Ⅰ for the synoptophore evaluation and postoperatively, 76 patients achieved Grade Ⅰ. Meanwhile, 55 patients had Grade Ⅱ preoperatively and 72 achieved Grade Ⅱ postoperatively. For Grade Ⅲ, there were 49 patients preoperatively and 64 patients postoperatively （P〈0.05）; （4） Patients of 5-8 years old had a significantly better recovery rate of binocular vision than those of 9-18 years old （P〈0.05）; （5） Patients taking postoperative synoptophore exercise had a better binocular vision than those taking no exercise （P〈0.05）. Conclusions：（1） strabismus surgery can help to preserve or restore the binocular vision for intermittent exotropia; （2） Receiving the surgery at young ages may develop better postoperative binocular vision; （3） The postoperative synoptophore exercise can help to restore the binocular vision.

关键词： Intermittent exotropia (X(T)) surgery Binocular vision

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

Microstructure and Tribological Behavior of Cr-Cu-N Coatings Deposited by Ion Beam Assisted Magnetron sputtering

引用

稀有金属材料与工程 2012年第S1期41卷 355-358页

作者： Tian linhai Zhang yang yang Yaojun Zhu Xiaodong Tang Bin Taiyuan Univ Technol Res Inst Surface Engn Taiyuan 030024 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China

Cr-Cu-N coatings with copper content from 0 at%to 6.8 at%were deposited on silicon and M2 steel by ion beam assisted magnetron *** microstructure and composition of the coatings were characterized using sEM,GDOEs,XRD and *** mechanical properties of the coatings were tested on a standard hardness *** tribological behavior of the coatings in dry wear condition was studied by means of ball-on-disc wear *** experimental results show that addition of copper can restrict the columnar crystal growing to a certain *** and XPs analysis indicate that coatings are mainly composed of Cr and CrN *** is mainly existed in a free state in the *** adding has no obvious effects on the hardness of the ***,the coatings fracture toughness can be improved by doped *** coefficient of friction of the coatings against bearing steel is in the range of 0.25-0.6 changing with the copper *** coating with 2.6 at%copper shows the lowest coefficient of friction about 0.25 and wear rate which is about one tenth of that of the coating with 6.8 at%*** higher coefficient of friction and wear rate of the coating with 6.8at%copper may be attributed to its lower bonding strength.

关键词： Cr-Cu-N coatings ion beam assisted magnetron sputtering microstructure tribological behavior

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

synthesis and Adsorption Property of Dihydroxyl Azacrown Ether-Grafted Chitosan

引用

Chinese Chemical letters 2002年第1期13卷 27-28页

作者： Zhi Kuan yang li ZHUANG yang YUAN Department of Environmental science Wuhan UniversityWuhan 430072

A novel dihydroxyl azacrown ether chitosan was synthesized by reacting dihydroxyl azacrown ether with epoxy activated chitosan. The adsorption property of the azacrown ether chitosan for Pb2+, Cr3+, and Ag+, were determined. The experimental results showed that the dihydroxyl azacrown ether grafted chitosan has high adsorption capacity and high selectivity for some metal ions.

关键词： Chitosan azacrown ether adsorption property synthesis.

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

Plasma-induced, nitrogen-doped graphene-based aerogels for high-performance supercapacitors

引用

light(science & Applications) 2016年第1期5卷 583-589页

作者： Xue-Yu Zhang shi-Han sun Xiao-Juan sun Yan-Rong Zhao li Chen Yue yang Wei lü Da-Bing li Key laboratory of Advanced structural Materials Ministry of Education&Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China state Key laboratory of luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China school of Basic sciences&Advanced Institute of Materials science Changchun University of TechnologyChangchun 130012China

Commonly used energy storage devices include stacked layers of active materials on two-dimensional sheets,and the limited specific surface area restricts the further development of energy ***-dimensional(3D)structures with high specific surface areas would improve device ***,we present a novel procedure to fabricate macroscopic,high-quality,nitrogen-doped,3D graphene/nanoparticle *** procedure includes vacuum filtration,freeze-drying,and plasma treatment,which can be further expanded for large-scale production of nitrogen-doped,graphene-based *** behavior of the supercapacitor is investigated using a typical nitrogen-doped graphene/Fe_(3)O_(4) nanoparticle 3D structure(NG/Fe_(3)O_(4)).Compared with 3D graphene/Fe_(3)O_(4) structures prepared by the traditional hydrothermal method,the NG/Fe_(3)O_(4) supercapacitor prepared by the present method has a 153%improvement in specific capacitance,and there is no obvious decrease in specific capacitance after 1000 *** present work provides a new and facile method to produce large-scale,3D,graphene-based materials with high specific capacitance for energy storage.

关键词： energy storage N-doping plasma three-dimension

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

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：