检索结果-南通市图书馆

Anisotropic Curl-free Wavelet Bases on the Unit Cube

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第4期29卷 801-814页

作者： ying chun JIANG School of Mathematics and Computational Science Guilin University of Electronic Technology

This paper deals with the construction of anisotropic curl-free wavelets on the cube [0,1]3, which satisfies the specific boundary conditions. First, one constructs curl-free wavelets on the unit cube based on one dimensional wavelets on the interval [0,1] with some boundary conditions. Then, the stability of the corresponding wavelets in curl-free space and the characterization of Sobolev spaces are studied. Finally, one gives a Helmholtz decomposition and the representation of curl and div operators in wavelet coordinates.

关键词： Wavelets anisotropic curl-free cube Helmholtz decomposition

Two-Particle Boltzmann H-theorem

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第3期31卷 747-756页

作者： Burenmandula ying-chun ZHAO AQILALTU School of Mathematics and Statistics Chifeng University Primary Education College Chifeng University School of Mathematical Sciences Inner Mongolia University

The celebrated H-theorem of Boltzmann has important physical significance. The H-theorem states that entropy cannot diminish, and that the distribution function f（z, t） must tend towards its equilibrium *** this paper, using the relationship between solutions of Boltzmann equation and the two-particle Boltzmann equation system, we obtain three forms of Two-Particle Boltzmann H-theorem from the two-particle Boltzmann equation system of BBGGKY hierarchy, and give an application example for the Two-Particle Boltzmann H-theorem. Also, the relation between entropy and the Two-Particle Boltzmann H-theorem is obtained.

关键词： two-particle Boltzmann system two-Particle Boltzmann H-theorem Boltzmnnn H-theorem entropy

Adaptive Wavelet Solution to the Stokes Problem

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2008年第4期24卷 613-626页

作者： ying-chun Jiang Youming Liu College of Mathematics and Computer Sciences Guilin University of Electronic Technology Cuilin 541004 China Department of Applied Mathematics Beijing University of Technology Beijing 100022 China

This paper deals with the design and analysis of adaptive wavelet method for the Stokes problem. First, the limitation of Richardson iteration is explained and the multiplied matrix M0 in the paper of Bramble and Pasciak is proved to be the simplest possible in an appropiate sense. Similar to the divergence operator, an exact application of its dual is shown; Second, based on these above observations, an adaptive wavelet algorithm for the Stokes problem is designed. Error analysis and computational complexity are given; Finally, since our algorithm is mainly to deal with an elliptic and positive definite operator equation, the last section is devoted to the Galerkin solution of an elliptic and positive definite equation. It turns out that the upper bound for error estimation may be improved.

关键词： Richardson iteration adaptive algorithm wavelets Stokes problem Galerkin solution

Spectroscopic Study of the Interaction of Bu_2SnCl_2 with EHPG

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第2期12卷 165-166页

作者： chun ying WEI Pin YANG Institute of molecular Science Shanxi UniversityTaiyuan 030006

The difference UV spectra and fluorescence of Bu2SnCl2 and ethylene bis (o-hydroxyphenylglycine) (EHPG), a ligand used previously for mimicking Fe3+ binding of transferrins, was first studied in Tris-HCl buffer solution (pH7.4). Difference UV spectral studies show that the binding of Bu2SnCl2 to EPHG takes twelve hours and gives rise to 1:1 complex. The binding constant for Bu2SnCl2-EHPG complex is estimated to be 1.65 X 10(3) M-1. Fluorescence studies also show an increase in intensity of EHPG after interaction with Bu2SnCl2.

关键词： EHPG spectroscopy transferrin

Hutchinson-Gilford Progeria Syndrome and its Relevance to Cardiovascular Diseases and Normal Aging

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2013年第5期26卷 382-389页

作者： QI ying chun XIE Xiao Hua First Department of Comprehensive Surgery in South Building Chinese PLA General Hospital

Hutchinson-Gilford progeria syndrome(HGPS,OMIM176670)is an extremely rare,sporadic genetic syndrome with a reported prevalence of one in4-8million children *** April2012,the total number of known living children with ... 详细信息

关键词： HGPS Hutchinson-Gilford Progeria Syndrome and its Relevance to Cardiovascular Diseases and Normal Aging

Self-assembly Behavior of Symmetrical Linear ABCA Tetrablock Copolymer:A Self-consistent Field Theory Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第7期36卷 888-896页

作者： Dan Liu ying-ying Wang ying-chun Sun Yuan-Yuan Han Jie Cui Wei Jiang School of Physics Northeast Normal UniversityChangchun 130024China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

ABCA tetrablock copolymers offer new opportunities for design of materials with novel structures. Using real-space self- consistent field theory and simulation, we systematically examined the self-assembly behavior of linear ABCA tetrablock copolymers in a 2D space. The simulation was carried out under conditions of symmetrical compositions and interactions. We focus on the influence of chain length ratio of block A and interactions between block A and other blocks B and C on the self-assembly behavior of the copolymer system. The simulation results show that most of the structures self-assembled by the ABCA tetrablock copolymers are centrosymmetric, such as diblock-like lameUa phase, two kinds of lameUae with beads at interface, two kinds of hierarchical lamella phase, hexagonal honeycomb-like phase, lamella phase with mixed BC and hexagonal spheres with mixed BC. Furthermore, we find that a novel noncentrosymmetric Janus spheres can be obtained when the interaction between blocks B and C is strong, whereas a noncentrosymmetric lamella phase was obtained at weak interaction between blocks B and C. Phase diagrams for the ABCA tetrablock copolymers with different interaction strength between blocks B and C are constructed by comparing free energies of candidate ordered structures. In addition, studies on the metastable behavior of the system reveal that enthalpy plays an important role in the metastable behavior of the ABCA tetrablock copolymer system. Our work can provide useful guide for structure control of such kind of tetrablock copolymers in experiments.

关键词： Self-assembly Tetrablock copolymer Self-consistent field Simulation

Synthesis and biodistribution of [^(131)I]IMPY

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2005年第5期16卷 289-292页

作者： LU chun-Xiong WU chun-ying JIANG Quan-Fu Jiangsu Institute of Nuclear Medicine Wuxi 214063

The synthesis and biodistribution of β-amyloid plaques imaging agent [131I]-2- (4′-dimethylaminophenyl)- 6-iodoimidazo[1,2-α] pyridine ([131I]IMPY) were reported. The chemical structure of the labeling precursor 2-(4′-dimethylaminophenyl)-6-(tributylstannyl)imidazo[1,2-α] pyridine and all its intermediates were verified by IR,HNMR and MS. The radioiodinated compound was prepared using iododestannylation reaction by hydrogen per-oxide. Final radiochemical purity was above 95% determined by TLC. The in vivo biodistribution of [131I]IMPY in normal mice showed excellent brain uptake and washout, indicating this thioflavin-T based small molecular probe has potential for in vivo imaging amyloid deposits.

关键词：淀粉合成方法放射性医学疾病治疗功能系统

Hf_(2)CF_(2)单层热传输及热电性质的第一原理研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第4期42卷 168-176页

作者：董文欣李铁平张莉丁迎春何开华中国地质大学(武汉)数学与物理学院武汉430074 宜宾学院材料与化学工程学部宜宾644000

二维MXene材料是一种新型的功能性材料,其在热电领域具有潜在应用价值.本文采用第一性原理计算方法,通过求解声子和电子的玻尔兹曼输运方程,计算研究了MXene Hf_(2)CF_(2)单层的热传输特征和热电性质.声子谱揭示了Hf_(2)CF_(2)单层具有... 详细信息

二维MXene材料是一种新型的功能性材料,其在热电领域具有潜在应用价值.本文采用第一性原理计算方法,通过求解声子和电子的玻尔兹曼输运方程,计算研究了MXene Hf_(2)CF_(2)单层的热传输特征和热电性质.声子谱揭示了Hf_(2)CF_(2)单层具有热力学稳定性.在室温条件下,Hf_(2)CF_(2)单层的晶格热导率为14.25 Wm^(-1)K^(-1),且随着温度的升高而降低;电子热导率却随着温度和掺杂浓度的增加而升高.电输运性质中,电导率和Seebeck系数随载流子浓度的变化相反,确保能够获得优异的热电性能.在600 K条件下,n型MXene Hf_(2)CF_(2)单层的最大功率因子可以达到61.24 mW/(mK^(2)).载流子迁移率具有较高的各向异性,且电子的迁移率远远高于空穴的迁移率.基于热导及电导计算结果,n型MXene Hf_(2)CF_(2)单层沿x轴方向的热电优值可达到1.75,高于其他已报道的类似结构的热电优值,表明了MXene Hf_(2)CF_(2)单层是一种潜在的高性能n型热电材料.

关键词： MXene Hf_(2)CF_(2) 热电性能晶格热导率第一性原理

Resource optimization in distributed cooperative multi-relay system based on STBC-OFDM

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

The Journal of China Universities of Posts and Telecommunications 2007年第2期14卷 1-6页

作者： WU Tong QU Xin-chun WANG ying Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

On the basis of the amplify-and-forward relaying mode, a two-hop distributed cooperative multi-relay system is proposed combining with the space-time block coding OFDM （STBC-OFDM） technique. Taking the maximum end-to-end data rate as optimization criterion, the signal-to-noise ratio （SNR） of receiving terminal is deduced. On the basis of the water-filling theory, the optimal power allocation （OPA） is achieved for each subcarrier in each antenna and each relay node （RN） of the two-hop, to realize the resource optimization. Monte Carlo method is adopted in simulation. The simulation results show that compared with the uniform resource allocation scheme, the proposed OPA strategy *** the system capacity. And the energy consumption of each transmission bit will be decreased, indicating the improvement of resource efficiency. In the scenario that the total power is limited, the system performance can be enhanced further by the distributed cooperative multi-relay through the diversity gain.

关键词： STBC-OFDM distributed multi-relay water-filling theory OPA Monte Carlo