搜索结果: 61-75 共查到“知识库 物理学其他学科”相关记录833条 . 查询时间(4.351 秒)
Chiral spin currents and spectroscopically accessible single merons in quantum dots
currents merons quantum dots
2011/9/9
We provide unambiguous theoretical evidence for the formation of correlation-induced isolated merons in rotationally-symmetric quantum dots. Our calculations rely on neither the lowest-Landau-level ap...
纵向多矩形腔表面等离子体滤波器研究
表面等离子体 金属亚波长结构 滤波器
2012/11/5
提出一种新型的纵向有多个矩形腔的表面等离子体滤波器,采用时域有限差分方法(FDTD)分别研究了单个腔、2个腔和3个腔的透射性质,发现单个腔中F-P共振导致了透射峰;在单个腔中间增加一层金属薄膜构成2个腔,原来单腔的透射峰出现劈裂或者消失,劈裂间距受结构参数变化影响;结合近场分布和理论分析,认为长短表面等离子体共振导致了劈裂.
Assessing the consistency of community structure in complex networks
community structure complex networks
2011/9/9
In recent years, community structure has emerged as a key component of complex network analysis.As more data has been collected, researchers have begun investigating changing community structure acros...
On the Non-Progressive Spread of Influence through Social Networks
Non-Progressive Social Networks
2011/9/14
The spread of in uence in social networks is studied in two main categories: the progressive model and the non-progressive model (see e.g. the seminal work of Kempe, Kleinberg, and Tardos in KDD 2003)...
Speed of complex network synchronization
Complex systems Synchronization coupled oscillators Synchronization in the nervous system
2011/9/14
Synchrony is one of the most common dynamical states emerging on networks. The speed of convergence towards synchrony provides a fundamental collective time scale for synchronizing systems. Here we st...
Nanodiamond as a vector for siRNA delivery to Ewing sarcoma cells
drug delivery, siRNA, diamond, nanoparticles, photoluminescence
2011/9/13
We investigated the ability of diamond nanoparticles (nanodiamonds, NDs) to deliver small interfering RNA (siRNA) in Ewing sarcoma cells, in the perspective of in vivo anti-cancer nucleic acid drug de...
金属纳米结构表面等离子体共振的调控和利用
金属纳米颗粒 金属薄膜纳米结构 表面等离子体共振 局域场增强 生物医学应用 表面等离子体共振放大
2013/8/29
金属纳米结构的表面等离子体光学在光催化、纳米集成光子学、光学传感、生物标记、医学成像、太阳能电池, 以及表面增强拉曼光谱等领域有广泛的应用前景, 这些功能和金属纳米结构与光相互作用时产生的表面等离子体共振密切相关. 本文简单回顾国际上该领域过去十来年的一些重要研究进展和当前发展的前沿动态, 重点介绍我们课题组近年来在金属纳米颗粒和纳米结构的表面等离子体光学理论和实验研究上取得的一些成果. 同时还介...
Walther Bothe and Bruno Rossi: the birth and development of coincidence methods in cosmic-ray physics
Walther Bothe and Bruno Rossi cosmic-ray physics
2011/8/31
In 1924 Walther Bothe and Hans Geiger applied a coincidence method to the study of Compton scattering with Geiger needle counters. Their experiment con rmed the existence of radiation quanta and estab...
Rotational states in deformed nuclei: An analytic approach
deformed nuclei analytic approach
2011/7/20
The consequences of the spontaneous breaking of rotational symmetry are investigated in a field theory model for deformed nuclei, based on simple separable interactions.
Monte-Carlo implementations of kT -factorization formula with both KLN and running-coupling BK unintegrated gluon distributions for nucleus-nucleus collisions are used to analyze recent experimental d...
Nodal dynamics determine the controllability of complex networks
Nodal dynamics complex networks controllability
2011/9/1
Structural controllability has been proposed as an analytical framework for making predictions regarding the control of complex networks across myriad disciplines in the physical and life sciences (Lu...
Simple rules govern finite-size effects in scale-free networks
finite-size effects scale-free networks
2011/9/2
We give an intuitive though general explanation of the finitesize effect in scale-free networks in terms of the degree distribution of the starting network. This result clarifies the relevance of the ...
Advancements in the synthesis of faceted nanoparticles and colloids have spurred interest in the phase behavior of polyhedral shapes. Regular tetrahedra have attracted particular attention because the...
Li3Bi结构、力学和电子性质的第一性原理计算
Li3Bi 各向异性 第一性原理
2012/11/5
基于密度泛函的线性响应理论,通过第一性原理的赝势方法,对Fm-3m相Li3Bi的结构、力学和电子性质做了系统的研究.优化得到的平衡结构参数与实验值符合得很好.计算表明,Fm-3m结构在零压下的焓最低,满足力学稳定标准,是最稳定的结构.计算得到的Fm-3m相Li3Bi的块体模量、剪切模量和弹性模量分别为30.2,25.5 GPa和59.6 GPa.德拜温度是312 K.Li3Bi具有小的弹性各向异性...
Relationship between electron density and effective densities of body tissues for stopping, scattering and nuclear interaction of proton and ion beams
electron density body tissues proton and ion beams
2011/9/9
In treatment planning of charged-particle radiotherapy, patient heterogeneity is normally modeled as variable-density water to best reproduce the stopping power. This water-based model would cause sub...