检索结果-南通市图书馆

Science China Mathematics 2024年第11期67卷 2433-2452页

作者： feng shao Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

Let X be an irreducible Hermitian symmetric space of compact type(IHSS for short).In this paper,we give the irreducible decomposition of *** a by-product,we give a cohomological characterization of the rank of ***,we introduce pseudoeffective thresholds to measure the bigness of tangent bundles of smooth complex projective varieties precisely and calculate them for irreducible Hermitian symmetric spaces of compact type.

关键词： tangent bundle pseudoeffective threshold irreducible Hermitian symmetric space of compact type(IHSS) multiplicity free action

A Homomorphism between Circuit Cobordism Groups and Pseudohomology Groups over Configuration Space B

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2016年第12期32卷 1415-1429页

作者： shao feng WANG School of Mathematical Sciences Peking University

We develop a new method to perturb singular circuits in configuration space B with trivial isotropy groups, and construct a homomorphism Ф. between its circuit cobordism groups and pseudo- homology groups. This work ... 详细信息

关键词： Homomorphism circuit cobordism pseudohomology

First-Principles Study on Electronic and Optical Properties of Graphene-Like Boron Phosphide Sheets

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： shao-feng Wang Xiao-jun Wu CAS Key Laboratory of Materials for Energy Conversion and Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China CAS Key Laboratory of Materials for Energy Conversion and Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 ChinaSynergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei 230026 ChinaSchool of Chemistry and Materials Science and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China

Two-dimensional semiconducting materials with moderate band gap and high carrier mobility have a wide range of applications for electronics and optoelectronics in nanoscale. On the basis of first-principles calculations, we perform a comprehensive study on the electronics and optical properties of graphene-like boron phosphide (BP) sheets. The global structure search and first-principles based molecular dynamic simulation indicate that two-dimensional BP sheet has a graphene-like global minimum structure with high stability. BPmonolayer is semiconductor with a direct band gap of 1.37 eV, which reduces with the number of layers. Moreover, the band gaps of BP sheets are insensitive to the applied uniaxial strain. The calculated mobility of electrons in BPmonolayer is as high as 106 cm2/(V·s). Lastly, the MoS2/BP van der Waals heterobilayers are investigated for photovoltaic applications, and their power conversion efficiencies are estimated to be in the range of 17.7%–19.7%. This study implies the potential applications of graphene-like BP sheets for electronic and optoelectronic devices in nanoscale.

关键词： Density functional theory BP sheet Electronic structure Optical properties

Multi-view video color correction using dynamic programming

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

Journal of Systems Engineering and Electronics 2008年第6期19卷 1115-1120页

作者： shao feng Jiang Gangyi Yu Mei Faculty of Information Science and Engineering Ningbo Univ. Ningbo 315211 P. R. China National Key Lab of Software New Technology Nanjing Univ. Nanjing 210093 P. R. China

Color inconsistency between views is an important problem to be solved in multi-view video systems. A multi-view video color correction method using dynamic programming is proposed. Three-dimensional histograms are constructed with sequential conditional probability in HSI color space. Then, dynamic programming is used to seek the best color mapping relation with the minimum cost path between target image histogram and source image histogram. Finally, video tracking technique is performed to correct multi-view video. Experimental results show that the proposed method can obtain better subjective and objective performance in color correction.

关键词： multi-view video color correction dynamic programming video tracking

An eikonal equation based path planning method using polygon decomposition and curve evolution

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第5期16卷 1001-1018页

作者： Zheng Sun Zhu-feng shao Hui Li School of Mechanical and Electrical Engineering Zaozhuang UniversityZaozhuang277160China Department of Mechanical Engineering School of Mechanical EngineeringTsinghua UniversityBeijing100084China

Path planning is a key technique of autonomous navigation for robots,and the velocity field is an important *** velocity field in a complex workspace is still *** this paper,an inner normal guided segmentation algorithm in a complex polygon is proposed to decompose the complex workspace in this *** artificial potential field model based on probability theory is then used to calculate the potential field of the decomposed workspace,and the velocity field is obtained by utilizing the potential field of this *** optimization is implemented by curve evolution,during which the internal force generated in the smoothing process of the initial path by a mean filter and the external force is obtained from the gradient of the workspace potential *** parameter selection principle is deduced by analyzing the influence of several parameters on the path length and *** results show that the designed polygon decomposition algorithm can effectively segment complex workspace and that the path optimization algorithm can shorten and smoothen paths.

关键词： Level set Path planning Artificial potential field Polygon decomposition Path optimization Curve evolution

Sensing bacterial infections by NAIP receptors in NLRC4 inflammasome activation

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2012年第2期3卷 98-105页

作者： Yi-Nan Gong feng shao National Institute of Biological Sciences Beijing 102206China Howard Hughes Medical Institute National Institute of Biological SciencesBeijing 102206China

The inflammasome is an emerging new pathway in innate immune defense against microbial infection or endogenous danger *** inflammasome stimulates activation of inflammatory caspases,mainly ***-1 activation is responsible for processing and secretion of IL-1βand IL-18 as well as for inducing macrophage pyroptotic *** of the large cytoplasmic inflammasome complex is thought to be mediated by members of NOD-like receptor(NLR)*** functions of most of the NLR proteins remain to be defined,several NLR proteins including NLRC4 have been shown to assemble distinct inflammasome *** inflammasome pathways,particularly the NLRC4 inflammasome,play a critical role in sensing and restricting diverse types of bacterial *** we review recent advances in defining the exact bacterial ligands and the ligand-binding receptors involved in NLRC4 inflammasome *** of the discovery of the NAIP family of inflammasome receptors for bacterial flagellin and type III secretion apparatus on future inflammasome and bacterial infection studies are also discussed.

关键词： inflammasome NOD-like receptors NLRC4 caspase-1 NAIP type III secretion system flagellin Salmonella Legionella enteropathogenic E.coli Burkholderia

Transport of cadmium from soil to grain in cereal crops: A review

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第1期31卷 3-10页

作者： Jian feng MA Ren Fang SHEN Ji feng shao Institute o f Plant Science and Resources Okayama UniversityChuo 2-20-1Kurashiki 710-0046Japan State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin'An 311300China

Due to rapid urbanization and industrialization, many soils for crop production are contaminated by cadmium(Cd), a heavy metal highly toxic to many organisms. Cereal crops such as rice, wheat, maize, and barley are the primary dietary source of Cd for humans, and reducing Cd transfer from soil to their grains is therefore an important issue for food safety. During the last decade, great progress has been made in elucidating the molecular mechanisms of Cd transport, particularly in rice. Inter-and intraspecific variations in Cd accumulation have been observed in cereal crops. Transporters for Cd have been identified in rice and other cereal crops using genotypic differences in Cd accumulation and mutant approaches. These transporters belong to different transporter families and are involved in the uptake, vacuolar sequestration, root-to-shoot translocation, and distribution of Cd. Attempts have been made to reduce Cd accumulation in grains by manipulating these transporters through overexpression or knockout of the transporter genes, as well as through marker-assisted selection breeding based on genotypic differences in Cd accumulation in the grains. In this review, we describe recent progress on molecular mechanisms of Cd accumulation in cereal crops and compare different molecular strategies for minimizing Cd accumulation in grains.

关键词： barley gene knockout gene overexpression genotypic difference maize rice transporter wheat

Lentivirus-Mediated Short Hairpin RNA for Follistatin Downregulation Suppresses Tumor Progression in Hypopharyngeal Carcinoma

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2022年第4期42卷 832-840页

作者： Liang GE shao-feng LIU Department of Otorhinolaryngology Head and Neck Surgery the Yijishan Hospital of Wannan Medical CollegeWuhu 241001China

Objective:Follistatin(FST)inhibits the action of activin by interfering with the binding of activin to its *** the prognostic value of FST in various cancers has been investigated previously,studies rarely focused on hypopharyngeal carcinoma(HPC).In our study,the effect of FST expression on HPC tissues and cell lines was ***:A total of 60 patients with HPC were recruited for this *** of FST mRNA and protein were measured by quantitative polymerase chain reaction(PCR)and immunohistochemistry in HPC tissue samples and by qPCR in the HPC FaDu cells,as well as immortal nasopharyngeal epithelial cell line NP-69 *** silencing the FST expression in FaDu cells using lentivirus-mediated siRNA that was specific for FST mRNA,cell proliferation was determined by a Celigo *** growth was monitored in nude mice and viability was determined by a methylthiazoletetrazolium *** ratio of cell cycle arrest and apoptosis was evaluated by flow *** colony formation ability was performed using Giemsa *** addition,wound healing and Transwell migration and invasion assays were performed for the analysis of cell ***:FST expression was significantly higher in human HPC tissue and FaDu cells than in normal tissue and NP-69 cells.A higher expression of FST in HPC samples was positively correlated with advanced ***,FST knockdown by shRNA significantly decreased cell growth,colony formation,migration and ***,FST silencing increased the cell apoptosis percentage,and arrested cell cycle in the S phase in FaDu *** addition,FST silencing suppressed tumor growth in ***:Our results indicated that the FST gene was associated with HPC progression and may serve as a potential therapeutic target for the treatment of HPC.

关键词： follistatin hypopharyngeal carcinoma migration invasion proliferation apoptosis

Dislocation neutralizing in a self-organized array of dislocation and anti-dislocation

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

Chinese Physics B 2019年第11期28卷 251-257页

作者： feng-Lin Deng Xiang-Sheng Hu shao-feng Wang Department of Physics and Institute for Structure and Function Chongqing UniversityChongqing 400030China Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China

A one-dimensional(1 D) self-organized array composed of dislocation and anti-dislocation is analytically investigated in the frame of Peierls theory. From the exact solution of the Peierls equation, it is found that there exists strong neutralizing effect that makes the Burgers vector of each individual dislocation in the equilibrium array smaller than that of an isolated dislocation. This neutralizing effect is not negligible even though dislocations are well separated. For example, when the distance between the dislocation and the anti-dislocation is as large as ten times of the dislocation width, the actual Burgers vector is only about 80% of an isolated dislocation. The neutralizing effect originates physically from the power-law asymptotic behavior that enables two dislocations interfere even though they are well separated.

关键词： dislocation array neutralizing exact solution

Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第11期30卷 207-213页

作者： Ying-Jie Chen feng-Lan shao School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China

We study the property of magnetopolaron in a parabolic quantum dot under the Rashba spin–orbit interaction(RSOI)by adopting an unitary transformation of Lee–Low–Pines type and the variational method of Pekar type with and without considering the *** temporal spatial distribution of the probability density and the relationships of the oscillating period with the RSOI constant,confinement constant,electron–phonon coupling strength,phonon wave vector and temperature are *** results show that the probability density of the magnetopolaron in the superposition of the ground and first excited state takes periodic oscillation(T0/period)in the presence or absence of *** of the RSOI,the oscillating period is divided into different ***,the results indicate that the oscillating period increases(decreases)when the RSOI constant,electron-phonon coupling strength and phonon wave vector(the confinement constant)increase in a proper temperature,and the temperature plays a significant role in determining the properties of the polaron.

关键词： Rashba spin-orbit interaction quantum dot polaron temperature