检索结果-南通市图书馆

Cenozoic volcanism and lithospheric tectonic evolution in Qiangtang area, northern Qinghai-Tibet Plateau

Science China Earth Sciences 2005年第7期48卷 1011-1024页

作者： CHI Xiaoguo li cai jin Wei College of Earth Sciences Jilin University Changchun 130061 China College of Earth Sciences Jilin University Changchun 130061 China College of Earth Sciences Jilin University Changchun 130061 China

Following the collision between the Indian and Eurasian plates, the Cenozoic vol- canic activities are rather frequent in the Qiangtang area of northern Qinghai-Tibet Plateau. They can be divided into four series: alkaline basalt series, high-K calc-alkaline series, shoshonitic series and peralkaline potassic-ultrapotassic series. Geochemical data suggest that the magma sources of Cenozoic volcanic rocks have transferred from spinel lherzolite mantle in the early stage to garnet peridotite enriched mantle (EM2) in the later stage. The high Mg# number and extremely high Cr-Ni-Co abundance of high-K calc-alkaline and shoshonitic series andesites in the Qiangtang area indicate that the primary magma might be derived from subduction of conti- nent lithosphere from the Lhasa block. Incompatible element ratios of La/Rb, Zr/Rb, Rb/Nb, K/Nb, Pb/La and K/La of peralkaline potassic-ultrapotassic series lavas in northern Qinghai-Tibet Pla- teau are lower than island arc volcanic rocks and higher than and similar to oceanic island ba- salts. This signature indicates that the primary magma derive from a paleo-mantle wedge inter- fused by fluids derived from asthenosphere and/or subducted mantle lithosphere. But the above element ratios of ultrapotassic lavas in southern Tibet and ultrapotassic lamprophyres in eastern Tibet are higher than and similar to island arc volcanic rocks, which means that the primary magma sources contained a large quantity of crust contaminant from fluids and/or melts derived from subducted continent lithosphere. The studies result supports that the indian continental lithosphere has underthrust beneath Tibet to about the middle of the plateau, and Eurasian (Qaidam basin) mantle lithosphere has underthrust beneath the Qiangtang area of northern Tibet Plateau. In the paper we demonstrate further that the pulsing cycles of potassic-ultrapotassic volcanism of the Qinghai-Tibet Plateau result from an asthenospher pulsing upwelling caused by the intraplate s

关键词： Cenozoic volcanism magmatic source lithosphere tectonic evolution northern Tibet.

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

The Adsorption Effect of Quaternized Chitosan Derivatives on Bile Acid

引用

Chinese Chemical Letters 2006年第7期17卷 981-984页

作者： Shu Xian MENG Ya Qing FENG Wen jin li cai Xia YIN jin Ping DENG School of Chemical Engineering and Technology Tianjin University Tianjin 300072

Three quatemized chitosan derivatives were synthesized and their adsorption performance of bile acid from aqueous solution was studied. The adsorption capacities and rates of bile acid onto quatemized chitosan derivatives were evaluated. The kinetic experimental data properly correlated with the second-order kinetic model, which indicated that the chemical sorption is the rate-limiting step. The results showed that the quatemized chitosan derivatives are favorable adsorbents for bile acid.

关键词： Chitosan quaternized chitosan derivative bile acid adsorption.

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

Twice-split phosphorus application alleviates low-temperature impacts on wheat by improved spikelet development and setting

引用

Journal of Integrative Agriculture 2023年第12期22卷 3667-3680页

作者： XU Hui HOU Kuo-yang FANG Hao liU Qian-qian WU Qiu liN Fei-fei DENG Rui ZHANG lin-jie CHEN Xiang li jin-cai School of Agronomy Anhui Agricultural UniversityHefei 230036P.R.China Jiangsu Collaborative Innovation Centre for Modern Crop Production Nanjing 210095P.R.China

Extreme low-temperature incidents have become more frequent and severe as climate change *** HuangHuai-Hai wheat growing area of China,the late spring coldness occurring at the jointing-booting stage(the anther interval stage)has resulted in significant yield losses of winter *** study attempts to develop an economical,feasible,and efficient cultivation technique for improving the low-temperature(LT)resistance of wheat by exploring the effects of twice-split phosphorus application(TSPA)on wheat antioxidant characteristics and carbon and nitrogen metabolism physiology under LT treatment at the anther interval stage using Yannong 19 as the experimental *** treatments consisted of traditional phosphorus application and TSPA,followed by a-4℃ LT treatment and natural temperature(NT)control at the anther interval *** analyses showed that,compared with the traditional application,the TSPA increased the net photosynthetic rate(P_(n)),stomatal conductance(Gs),and transpiration rate(T_(r))of leaves and reduced the intercellular carbon dioxide concentration(C_(i)).The activity of carbon and nitrogen metabolism enzymes in the young wheat spikes was also increased by the TSPA,which promoted the accumulation of soluble sugar(SS),sucrose(SUC),soluble protein(SP),and proline(Pro)in young wheat spike and reduced the toxicity of malondialdehyde(MDA).Due to the improved organic nutrition for reproductive development,the young wheat spikes exhibited enhanced LT resistance,which reduced the sterile spikelet number(SSN)per spike by 11.8%and increased the spikelet setting rate(SSR)and final yield by 6.0 and 8.4%,respectively,compared to the traditional *** positive effects of split phosphorus application became more pronounced when the LT treatment was prolonged.

关键词： optimizing phosphorus application low-temperature stress carbon and nitrogen metabolism young spike development wheat

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

Correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements

引用

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 39-48页

作者： Peng li Meifeng cai Shengjun Miao Yuan li Yu Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China

Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress *** investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in China were adopted,a newly defined characteristic parameter C_(ERP)was proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution *** results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with *** is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and ***,there is no obvious relationship between the rock quality designation(RQD)and *** maximum horizontal stress σ_(H) is a function of rock properties,showing a certain linear relationship with the C_(ERP)at the same *** addition,the overall change trend of σ_(H) determined by the established fuzzy identification method is to increase with the increase of C_(ERP).The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and C_(ERP),and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data.

关键词： overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification

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

CENOZOIC VOLCANISM AND liTHOSPHERETECTONIC EVOLUTION IN NORTH TIBET

引用

地学前缘 2000年第S1期7卷 153-154页

作者： Chi Xiaoguo, li cai, jin Wei, liu Shen, Yang Rihong (Changchun University of Science and Technology,Changchun 130026, China)

Volcanism is the direct indication of the upper mantle thermodynamic activities, and it is an efficient path to study the lithosphere tectonic evolution. Cenozoic volcanism in North Tibet is of obviously time circles. In the space, from south to north, the chemical composition of volcanics changed from Na\|rich alkalic basaltic series formed 44Ma. ago into high\|K calcalkali series formed in about 40～*** Qiangtang area, into minor amount of leucite basalt and phonolite series of 26Ma., further into shoshonite series aged at 19～7Ma. in Cocoxili basin, until Quaternary shoshonite series in Karakunlun and Qilian Mt.\|Yumen region(Xiaoguo Chi etc.1999).Isotopes of Sr,Nd,Pb and trace elements in volcanic rocks provide wide range of information for the evolution of lithosphere in North Tibet after 45Ma. Present research shows that Na\|rich alkalic basalt series formed 44Ma. ago has the features of a primitive mantle in Sr,Nd,Pb isotopes. Along with the evolutionary tendency to high\|K calcalkali series and phonolite series, isotopes of Sr,Nd,Pb evolve towards EM2\|rich mantle end. The North Tibet is a compound continental mass combined from several terrains of different geological periods and the lithosphere mantle sees a complicated evolutionary history. Hence, the mixing of different rocks in ancient subduction zones and long history of metasomatism in the upper mantle offered excellent and favorable conditions for the formation of EM2 mantle end and for potassic enrichment. Isotopic evolutionary features indicate that the early magma came from the asthenosphere while later magmas were derived from partial remelting of lithosphere mantle.

关键词： volcanism evolution of lithosphere North Tibet

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

RE-SEGNN:recurrent semantic evidence-aware graph neural network for temporal knowledge graph forecasting

引用

Science China(Information Sciences) 2025年

作者： Wenyu cai Mengfan li Xuanhua SHI Yuanxin FAN Quntao ZHU Hai jin National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and TechnologyHuazhong University of Science and Technology

Temporal knowledge graph(TKG) reasoning, has seen widespread use for modeling real-world events, particularly in extrapolation settings. Nevertheless, most previous studies are embedded models, which require both entity and relation embedding to make predictions, ignoring the semantic correlations among different entities and relations within the same timestamp. This can lead to random and nonsensical predictions when unseen entities or relations occur. Furthermore, many existing models exhibit limitations in handling highly correlated historical facts with extensive temporal depth. They often either overlook such facts or overly accentuate the relationships between recurring past occurrences and their current counterparts. Due to the dynamic nature of TKG, effectively capturing the evolving semantics between different timestamps can be *** address these shortcomings, we propose the recurrent semantic evidenceaware graph neural network(RE-SEGNN), a novel graph neural network that can learn the semantics of entities and relations simultaneously. For the former challenge, our model can predict a possible answer to missing quadruples based on semantics when facing unseen entities or relations. For the latter problem, based on an obvious established force, both the recency and frequency of semantic history tend to confer a higher reference value for the current. We use the Hawkes process to compute the semantic trend, which allows the semantics of recent facts to gain more attention than those of distant facts. Experimental results show that RE-SEGNN outperforms all SOTA models in entity prediction on 6 widely used datasets, and 5 datasets in relation prediction. Furthermore, the case study shows how our model can deal with unseen entities and relations.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Multi-Objective Particle Swarm Optimization Algorithm Based on Decomposition and Multi-Selection Strategy

引用

Computers, Materials & Continua 2025年第1期82卷 997-1026页

作者： li Ma cai Dai Xingsi Xue Cheng Peng School of Computer Science Shaanxi Normal UniversityXi’an710119China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of TechnologyFuzhou350118China Information Construction and Management Center and Institute of Artificial Intelligence and Educational New Productivity Ningxia Normal UniversityGuyuan756099China

The multi-objective particle swarm optimization algorithm(MOPSO)is widely used to solve multi-objective optimization *** the article,amulti-objective particle swarm optimization algorithmbased on decomposition and multi-selection strategy is proposed to improve the search ***,two update strategies based on decomposition are used to update the evolving population and external archive,***,a multiselection strategy is *** first strategy is for the subspace without a non-dominated *** the neighbor particles,the particle with the smallest penalty-based boundary intersection value is selected as the global optimal solution and the particle far away fromthe search particle and the global optimal solution is selected as the personal optimal solution to enhance global *** second strategy is for the subspace with a non-dominated *** the neighbor particles,two particles are randomly selected,one as the global optimal solution and the other as the personal optimal solution,to enhance local *** third strategy is for Pareto optimal front(PF)discontinuity,which is identified by the cumulative number of iterations of the subspace without non-dominated *** the subsequent iteration,a new probability distribution is used to select from the remaining subspaces to ***,an adaptive inertia weight update strategy based on the dominated degree is designed to further improve the search ***,the proposed algorithmis compared with fivemulti-objective particle swarm optimization algorithms and five multi-objective evolutionary algorithms on 22 test *** results show that the proposed algorithm has better performance.

关键词： Multi-objective optimization multi-objective particle swarm optimization decomposition multi-selection strategy

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

Experimental Research on a Feasible Building Insulation Material Based Reed in China

引用

Journal of Thermal Science 2025年第1期34卷 176-187页

作者： liU Tiantian PENG Yizhe liU lifang cai Chenghan WANG Shuang li Hongqiang College of Civil Engineering Hunan University College of Civil Engineering Hunan University of Science and Technology School of Energy and Power Jiangsu University of Science and Technology National Center for International Research Collaboration in Building Safety and Environment (NCIRCBSE) Hunan University Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan University

The seemingly useless reeds are prepared as thermal insulation materials,which not only meet the requirements of environmental sustainability but also enhance the added value of reeds,creating new economic *** hydrophobicity of raw biomass surfaces leads to problems such as weak bonding strength and non-dense structure in the formed materials,as well as issues related to the residual insect infestations on the *** this study,reed straw was used as the raw material,and foamed geopolymer was used as the binder to prepare building insulation materials based *** improve the interfacial adhesion performance between reed straw and foamed geopolymer,a thermochemical modification method-thermal carbonization,was *** this study,the mechanical properties and hydraulic properties of the studied materials with different degrees of surface thermal modification were tested,especially the fire resistance performance,and weathering resistance performance rarely found in published *** the surface thermal modification condition of reed straw was 250℃（30 min）,the comprehensive performance of reed-based building insulation materials was the best,when the studied material density was 321.3 kg/m3;the compressive strength was 0.59 MPa;the thermal conductivity was 0.101 W/（m·K）;the pH was 11.27;the moisture absorption rate was 25.1%,and the compressive strength loss rate in wet-dry cycles was 18.5%.In addition,it had excellent fire resistance performance and weathering resistance *** new material can be widely used to improve the thermal insulation of traditional buildings and as sandwich filler in prefabricated buildings,such as preparing insulating walls.

关键词： building insulation material based reed fire resistance performance interface adhesion properties pre-treatment of reeds weathering resistance performance

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

不同贮藏性青花菜花球的抗氧化特性

引用

天津大学学报 2011年第11期44卷 1014-1018页

作者：李进才赵习姮天津大学化工学院天津300072 天津大学农业与生物工程学院天津300072

为研究青花菜(Brassica oleracea ***)花球的抗氧化特性与贮藏性的关系,选取贮藏性不同的春季2个品种("绿颜"和"城堡")和秋季2个品种("爱国者"和"高地"),将采后花球贮藏于20,℃条件下,在贮藏开始时和4 d后,测定了花球呼吸速率、衰老生... 详细信息

为研究青花菜(Brassica oleracea ***)花球的抗氧化特性与贮藏性的关系,选取贮藏性不同的春季2个品种("绿颜"和"城堡")和秋季2个品种("爱国者"和"高地"),将采后花球贮藏于20,℃条件下,在贮藏开始时和4 d后,测定了花球呼吸速率、衰老生理指标(叶绿素、蛋白质和丙二醛(MDA)含量)和抗氧化特性指标(活性氧超氧阴离子和过氧化氢含量,抗氧化酶超氧化物岐化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)和抗坏血酸过氧化氢酶(APX)活性,抗氧化物质抗坏血酸(AsA)和β-胡萝卜素(β-Car)含量)."绿颜"和"爱国者"贮藏开始时,呼吸速率低,活性氧含量少,抗氧化酶活性低;贮藏4,d后,叶绿素和蛋白质含量高,MDA含量少,SOD、CAT和POD活性上升幅度大,APX活性和AsA、β-Car含量下降幅度小.结果表明:"绿颜"比"城堡"、"爱国者"比"高地"衰老慢,耐贮藏;耐贮藏青花菜品种的花球具有采收时抗氧化酶活性低,贮藏期间SOD、CAT和POD活性上升幅度大,APX活性和抗氧化物质含量下降幅度小的抗氧化特性.

关键词：抗氧化特性青花菜衰老贮藏性

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

鹿蹄草素的电化学检测研究

引用

现代化工 2014年第4期34卷 168-169,171页

作者：栗进才黄鹏亳州职业技术学院药学院安徽亳州236800 安徽中医药大学药学院安徽合肥230038

建立鹿蹄草素的电化学检测方法,并用于鹿蹄草素的含量测定.在0.10 mol/L的Na2HPO4-NaH2 PO4（pH=6.86）缓冲溶液中,50 mV/S的扫描速度下,用差分脉冲伏安法对鹿蹄草素进行含量测定,鹿蹄草素在玻碳工作电极上出现一对氧化还原吸收峰,鹿蹄... 详细信息

建立鹿蹄草素的电化学检测方法,并用于鹿蹄草素的含量测定.在0.10 mol/L的Na2HPO4-NaH2 PO4（pH=6.86）缓冲溶液中,50 mV/S的扫描速度下,用差分脉冲伏安法对鹿蹄草素进行含量测定,鹿蹄草素在玻碳工作电极上出现一对氧化还原吸收峰,鹿蹄草素的氧化峰电流与其浓度在4.0×10^-7～2.4×10^-6mol/L的范围内呈良好的线性关系,其线性回归方程为：I=-49.719 7-1.287 2C,r=0.996 7,检出限为4.0×10^-7 mol/L.该方法操作简便、快捷、结果可靠.

关键词：鹿蹄草素电化学含量测定

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：