检索结果-南通市图书馆

The Degree of Proper Holomorphic MappingsBetween Special Domains in C^n

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

Acta Mathematica Sinica,English Series 2020年第4期36卷 395-400页

作者： Jia fu ning Xiang Yu ZHOU Department of Mathematics Central South UniversityChangsha 410083P.R.China Institute of Mathematics Academy of Mathematics and Systems Scienceand Hua Loo-Keng Key Laboratory of MathematicsChinese Academy of SciencesBeijing 100190P.R.China

Let Gi be closed Lie groups of U (n), Ω i be bounded Gi-invariant domains in C^n which contains 0, and O(C^n)^Gi = C, for i = 1, 2. It is known that if f : Ω 1 → Ω 2 is a proper holomorphic mapping, and f^-1{0} = {0}, then f is a polynomial mapping. In this paper, we provide an upper bound for the degree of such a polynomial mapping using the multiplicity of f .

关键词： Group action degree of polynomial mapping proper lomorphic mapping Bergman kernel invariant domain

Ultrathin poly(cyclocarbonate-ether)-based composite electrolyte reinforced with high-strength functional skeleton

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第6期81卷 603-612,I0013页

作者： Xiaojiao Zheng Da Xu ning fu Zhenglong Yang Shanghai Key Laboratory of D&A for Metal-functional Materials School of Materials Science and EngineeringTongji UniversityShanghai 200092China School of Chemical and Environmental Engineering Anyang Institute of TechnologyAnyang 455000HenanChina

Composite polymer electrolytes(CPEs)are considered to be the most promising to break through the performance and safety limitations of traditional lithium-ion batteries because of their excellent electrochemical and mechanical *** at the performance limitations of the most common polyether matrix such as poly(ethylene oxide)(PEO),a novel poly(cyclocarbonate-ether)polymer matrix was prepared by in-situ thermal curing,the weaker interaction between its C=O bond and Li^(+)can promote the rapid transport of Li^(+).Adding ionic liquid and active filler LLZTO to the matrix can synergistically reduce the crystallinity of matrix and promote the dissociation of lithium *** addition,a 3D functional skeleton made of polyacrylonitrile(PAN)and lithium fluoride(LiF)can greatly improve the mechanical strength of polymer matrix after cold pressing,and Li F is also conducive to interface *** thickness of the optimal sample(VP6L/CPL)was only 25μm,and its ionic conductivity,lithium ion transference number,and electrochemical stability window were as high as 7.17×10^(-4)S cm^(-1)(25℃),0.54 and 5.4 V,respectively,while the mechanical strength reaches 6.1 MPa,which can fully inhibit the growth of lithium *** excellent electrochemical performance and mechanical strength enable the assembled Li|VP6L/CPL|Li battery to be continuously charged for over 200 h and cycled stably for more than 2300 h,and Li|VP6L/CPL|LFP battery can be stably cycled for more than 400 and 550 cycles at 1 C(40℃)and 0.5 C(25℃),respectively.

关键词： Composite polymer electrolytes Polymer matrix 3D functional skeleton Plasticization Synergistic effect

A prediction method for ground-based stellar occultations by ellipsoidal solar system bodies and its application

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第5期17卷 65-78页

作者： Ye Yuan Yan-ning fu Zhuo Cheng Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China

A new programmable prediction method is developed to refine the occultation band by taking into consideration the triaxiality of an occulting body, as well as two more factors, namely, the barycenter offset of an occulting planet from the relevant planetary satellite system and the gravitational deflection of light rays due to an occulting planet. Although these factors can be neglected in most cases, it is shown that there are cases when these factors can cause a variation ranging from several tens to thousands of kilometers in the boundaries of occultation bands. Knowledge of analytic geometry simplifies the process of derivation and computation. This method is applied to long-term predictions of Jovian and Saturnian events.

关键词： shadow stellar Saturn Jupiter uncertainty programmable planet offset derivation refine

functional characterization of(E)-β-caryophyllene synthase from lima bean and its up-regulation by spider mites and alamethicin

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第10期16卷 2231-2238页

作者： LI Feng-qi fu ning-ning ZHOU Jing-jiang WANG Gui-rong Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry Sciences Institute of Plant Protection Chinese Academy of Agricultural Sciences Department of Biological Chemistry and Crop Protect Rothamsted Research

（E）-β-Caryophyllene is a sesquiterpene compound widely distributed in plants and functions in plant defence. However, little is known about the sequence and function of （E）-β-caryophyllene synthase in lima bean （Phaseolus lunatus）. Here, we report a new full-length cDNA （PICAHS） encoding （E）-β-caryophyllene synthase, a possible key enzyme of plant defence. The cDNA of PICAHS contains an open reading frame of 1 761 bp, encoding a protein of 586 amino acids with a predicted mass of 67.95 kDa. The deduced amino acid sequence shows 52% identity with sesquiterpene synthase MtCAHS of Med- icago truncatula. Based on phylogenetic analysis, PICAHS is classified as the terpene synthases （TPS）-a subfamily. The recombinant enzyme, expressed in Escherichia coil, catalysed the formation of a major product （E）-β-caryophyllene （82%） and a minor product a-humulene （18%） from farnesyl dJphosphate. Real-time quantitative PCR （qRT-PCR） analysis found that the PICAHS transcript was significantly up-regulated in leaves after treatment with spider mites and alamethicin （ALA）, suggesting its ecological function in plant defence.

关键词： plant defence terpene synthases (E)--caryophyllene lima bean

A first-order dynamical model of hierarchical triple stars and its application

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第11期15卷 1857-1866页

作者： Xing-Bo Xu Fang Xia Yan-ning fu Purple Mountain Observatory Chinese Academy of Sciences University of Chinese Academy of Sciences

For most hierarchical triple stars, the classical double two-body model of zeroth-order cannot describe the motions of the components under the current observational accuracy. In this paper, Marchal＇s first-order analytical solution is implemented and a more efficient simplified version is applied to real triple stars. The results show that, for most triple stars, the proposed first-order model is preferable to the zerothorder model both in fitting observational data and in predicting component positions.

关键词： hierarchical triple fitting simplified stars dynamical Delaunay positions observational coordinate

New perspective of Miocene marine hydrocarbon source rocks in deep-water area in Qiongdongnan Basin of northern South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2012年第5期31卷 107-114页

作者： LI Wenhao ZHANG Zhihuan LI Youchuan fu ning State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China CNOOC Research Institute Beijing 100027China

Drilling wells reveal that the organic matter abundance of Miocene marine source rocks in shallow water area of the Qiongdongnan Basin is relatively low with poor hydrocarbon generation poten- tial. However, in some drilling wells of deep water area close to the central depression belt, Miocene marine source rocks with better organic matter abundance and hydrocarbon generation have been found, which have achieved better source rock standard based on the analysis of geochemical charac- teristics. Although there are no exploratory wells in deep water area of the research region, through the comparative analysis of geochemical data of several typical exploratory wells respectively from shallow water area in the basin, central depression belt margin in deep-water area of the basin and Site 1148 of deep sea drilling in the South China Sea Basin, it reveals that the tendency of the quality of source rocks becomes positive gradually from delta to bathyal environment, which then becomes negative as in deep oceanic environment. Owing to the lack of terrestrial organic matter input, the important controlling factors of Miocene marine source rocks in the Qiongdongnan Basin are ocean productivity and preservation conditions of organic matter. The element geochemistry data indicate that the tendency of the paleoproductivity and the preservation conditions of organic matter become positive as water depth increase from shallow area to bathyal area close to central depression belt. So it is speculated that there must exist high quality source rocks in the central depression area where the preservation conditions of organic matter are much better. Besides, in theory, in oxygen-poor zone of oceanic environment at the water depth 400–1 000 m, the preservation conditions of organic matter are well thus forming high-quality marine source rocks. The result- ing speculation, it is reasonable to consider that there are high hydrocarbon generation potential source rocks in bathyal environme

关键词： hydrocarbon-generation potential marine source rocks ocean productivity preserva- tion condition deep water area deep sea drilling

Precise Evolutionary Asteroseismology of High-AmplitudeδScuti Star AE Ursae Majoris

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第10期22卷 61-76页

作者： Hui-Fang Xue Jia-Shu Niu Jian-ning fu Department of Physics Taiyuan Normal UniversityJinzhong 030619China Institute of Computational and Applied Physics Taiyuan Normal UniversityJinzhong 030619China Institute of Theoretical Physics Shanxi UniversityTaiyuan 030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China Department of Astronomy Beijing Normal UniversityBeijing 100875China

Stellar structure and evolution theory is one of the bases in modern *** inner structures and their evolutionary states can be precisely tested by asteroseismology,since the inner information is brought to the stellar surface by the global oscillating waves and becomes *** stellar evolutionary speed(i.e.,how long timescale does a star stay at a special evolution phase?),because of the insurmountable gap between the timescales of the evolutionary history of human civilization and a star,it can only be roughly tested by ensemble of stars in different evolutionary stages in most cases,and all the snapshots of these stars make up our global view of stellar *** effect of stellar evolution on the structure and the corresponding global size of a pulsating star will lead to tiny period variations of its pulsation modes,which are the most valuable indicators of its evolutionary state and can be used to test the stellar evolution theory by a single star rather than ensemble of ***,we report a High-AmplitudeδScuti star AE Ursae Majoris,which is located in the post main-sequence(MS)evolutionary stage and its observed linear period variation rate can be practically ascribed to its evolutionary *** result tests the stellar evolution theory from the pre-MS to post-MS with an unprecedented precision by a single star,and the framework can be extended to other type of pulsating stars to perform precise evolutionary asteroseismology,which aims to test the current stellar evolution theory in different evolutionary stages,discover the discrepancies between the theory and observations,and ultimately build a complete and precise stellar evolution theory to backtrack the history of each of these stars.

关键词： stars variables delta Scuti-stars evolution-stars oscillations(including pulsations)

Existence of Anti-periodic Solution for Differential Equations

在线全文

学校读者我要写书评

暂无评论

Communications in Mathematical Research 2010年第4期26卷 369-374页

作者： fu ning Institute of Mathematics Jilin UniversityChangchun130012 Institute of Economics Jilin UniversityChangchun 130012

In this paper,we discuss the anti-periodic boundary value problem for a class of first order differential *** using homotopy method,we obtain the conditions for the existence of anti-periodic solution for the equation... 详细信息

关键词： continuation theorem anti-periodic solution homotopy method

Economic Growth, Demographic Change and Rural-Urban Migration in China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第10期12卷 1884-1895页

作者： ZHONG fu-ning LI Qing XIANG Jing ZHU Jing Nanjing Agricultural University Chinese Academy of Social Sciences

Is China able to maintain fast growth after three decades？ This paper tries to answer this question by： 1） arguing that factors contributed to sustained long-run growth at supply side;2） focusing on contributions of demographic dividend especially that of rural-urban migration;and 3） analyzing rural demographic change with information collected through village-wide household *** alternatives to realize remaining potential demographic dividend are proposed based on the analysis of changing rural demographic structure.

关键词： demographic dividend rural-urban migration economic growth China