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Role of localised surface plasmon polaritons coupling in optical transmission through double-layer metal apertures

Gong Zhi-Qiang,Liu Jian-Qiang,

中国物理 B , 2010,
Abstract: In this paper, we investigate the optical properties of the double-layer metal films perforated with single apertures by analysing the coupling of localized surface plasmon polaritons (LSPPs). It is found that the amplitude and the wavelength of transmission peak in such a structure can be adjusted by changing the longitudinal interval $D$ between two films and the lateral displacements $d_{x}$ and $d_{y}$ which are parallel and perpendicular to the polarization direction of incident light, respectively. The variation of longitudinal interval $D$ results in the redshift of transmission peak due to the change of coupling strength of LSPPs near the single apertures. The amplitude of transmission peak decreases with the increase of $d_{y}$ and is less than that in the case of $d_{x}$, which originates from the difference in coupling manner between LSPPs and the localized natures of LSPPs.
Use of PCR Related Methods in Detection of Gene Mutation
PCR及其衍生技术在基因突变检测中的应用 Use of PCR Related Methods in Detection of Gene Mutation

Zhi-Qiang Yan,Sheng-Li Yang,Yi Gong,
颜志强
,杨胜利,龚毅YAN Zhi-Qiang,YANG Sheng-Li,GONG Yi

遗传 , 2003,
Abstract: Many inherited diseases and drug resistance have been attributed to mutations in corresponding genes. In this paper, several techniques based on PCR used in diagnosis were concluded. The development and research progress of Mismatch PCR were discussed in details. Some information about an assay that we developed for detection of antimicrobial resistance to quinolones was also described.
The detection and attribution of the abrupt change of precipitation in China based on the power-law exponent
利用幂律尾指数的中国降水突变检测与归因

Zhi Rong,Gong Zhi-Qiang,
支 蓉
,龚志强

物理学报 , 2008,
Abstract: 利用中国气象局国家气候中心740站点1960—2000年日降水观测资料,研究日降水幂律尾指数随时间的演变特征,结果表明中国华北、东北和西北地区0—7mm日降水幂律尾指数在1979—1980年之间发生突变,由此推测中国北方地区的大尺度气候背景在上世纪70年代末80年代初曾出现较大变化.该突变与厄尔尼诺和南方涛动(ENSO)综合指数联系紧密,可能是造成北方干旱化的重要原因之一.进一步分析表明,0—29mm日降水过程平稳性较好,30mm以上日降水过程平稳性相对较差,使得长期的暴雨预测面临严峻的挑战.
Analysis of precipitation characteristics of South and North China based on the power-law tail exponents

Feng Guo-Lin,Gong Zhi-Qiang,Zhi Rong,Zhang Da-Quan,

中国物理 B , 2008,
Abstract: Precipitation sequence is a typical nonlinear and chaotic observational series, and studies on precipitation forecasts are restricted to the use of traditional linear statistical methods, especially when analysing the regional characteristics of precipitation. In the context of 20 stations' daily precipitation series (from 1956 to 2000) in South China (SC) and North China (NC), we divide each precipitation series into many self-stationary segments by using the heuristic segmentation algorithm (briefly BG algorithm). For each station's precipitation series, we calculate the exponent of power-law tail (EPT) of the cumulative probability distribution of segments with a length larger than $l$ for precipitation and temperature series. Our results show that the power-law decay of the cumulative probability distribution of stationary segments might be a common attribution for precipitation and other nonstationary time series; the EPT somewhat indicates the precipitation duration and its spatial distribution that might be different from area to area. The EPT in NC is larger than in SC; Meanwhile, EPT might be another effective way to study the abrupt changes in nonlinear and nonstationary time series.
Circulation system complex networks and teleconnections

Gong Zhi-Qiang,Wang Xiao-Juan,Zhi Rong,Feng Ai-Xia,

中国物理 B , 2011,
Abstract:
Collective behaviour of climate indices in the North Pacific airben sea system and its potential relationships with decadal climate changes

Wang Xiao-Juan,Zhi Rong,He Wen-Ping,Gong Zhi-Qiang,

中国物理 B , 2012,
Abstract: A climate network of six climate indices of the North Pacific air-sea system is constructed during the period of 1948-2009. In order to find out the inherent relationship between the intrinsic mechanism of climate index network and the important climate shift, the synchronization behaviour and the coupling behaviour of these indices are investigated. Results indicate that climate network synchronization happened around the beginning of the 1960s, in the middle of the 1970s and at the beginnings of the 1990s and the 2000s separately. These synchronization states were always followed by the decrease of the coupling coefficient. Each synchronization of the network was well associated with the abrupt phase or trend changes of annually accumulated abnormal values of North Pacific sea-surface temperature and 500-hPa height, among which the one that happened in the middle of the 1970s is the most noticeable climate shift. We can also obtain this mysterious shift from the first mode of the empirical orthogonal function of six indices. That is to say, abrupt climate shift in North Pacific air-sea system is not only shown by the phase or trend changes of climate indices, but also might be indicated by the synchronizing and the coupling of climate indices. Furthermore, at the turning point of 1975, there are also abrupt correlation changes in the yearly mode of spatial degree distribution of the sea surface temperature and 500-hPa height in the region of the North Pacific, which further proves the probability of climate index synchronization and coupling shift in air-sea systems.
The research of durative characteristics of dry/wet series of China during the past 1000 years
中国近1000年旱涝的持续性特征研究

Gong Zhi-Qiang,Feng Guo-Lin,
龚志强
,封国林

物理学报 , 2008,
Abstract: 应用中国近531年旱涝指数和近1041年干湿指数,定义干旱(湿润)等级,滑动计算原指数序列各干旱(湿润)等级的出现次数,发现各等级出现的次数与其窗口长度之间均遵循指数分布Pi(x)=Ae-γx.结合指数分布的数理意义,定义指数特征值γ的倒数λ为描述旱(涝)持续性的尺度因子并对华北和江淮流域旱(涝)发生的持续性特征进行研究.结果表明:旱尺度因子的空间分布表现为由北向南呈带状式波动分布,我国北方地区干旱的持续性相对长江流域要长一些,由北向南三个区的旱尺度因子的均值分别为187,162,182.旱涝指数序列中旱或偏旱(涝或偏涝)相对集中的时段对旱(涝)持续性影响较显著,12世纪末期、13世纪早期、17世纪早期和20世纪末期华北和江淮流域发生时间上同步、空间上尺度较大的极端干旱事件的概率较高,这也从侧面验证了旱涝指数序列中群发现象的存在;华北地区1260—1280年(对应的气候背景为中世纪暖期的末期)的旱涝指数对旱尺度因子的影响较1980—2000年(对应的气候背景为20世纪全球增暖)的情况更显著;1260—1280年这一时段旱或偏旱年数较1980—2000年也要多一些.因此,在气候较暖的时期可能易发生强度大、范围广的同步干旱事件,而近30年的中国北方干旱化可能是自然变率起主导作用下人为变率和自然变率共同作用的结果.
Localized interface phonon polaritons in two coupled semi-infinite superlattices
两耦合半无限超晶格中的局域界面声子-极化激元

Gong Zhi-Qiang,He Meng-Dong,
龚志强
,贺梦冬

物理学报 , 2007,
Abstract: 采用转移矩阵方法,研究了含结构缺陷层的两耦合半无限超晶格(GaAs/AlAs)中的局域界面声子-极化激元模性质. 研究发现,含不同介电特性的缺陷超晶格结构中的局域界面声子-极化激元模在剩余射线区[ωTO, ωLO]的分布情况与数量存在不同,而且反对称模表现出不同的特征. 文中着重研究了缺陷层介电常数与角频率无关的缺陷超晶格,发现该结构中的局域界面声子-极化激元模对组分层的排列顺序与厚度、缺陷层的厚度以及横向波数有着不同程度的依赖.
Analysis of similarity of several proxy series based on nonlinear analysis method
基于非线性分析方法的多种代用资料的相似性研究

Gong Zhi-Qiang,Feng Guo-Lin,
龚志强
,封国林

物理学报 , 2007,
Abstract: Reconstruction and analysis of proxy series is an important program of climate research. Using methods of wavelet transformation and power spectrum, the main periods of Dulan tree ring and other 7 temperature proxy series are analyzed in this paper. Through filtering, the 8 original series were divided into many different scale components, the similarities in dynamics and external features of components on each scale are studied based on the dynamical correlation factor exponent and correlation coefficient. Research results show that quasi 100 a scale might be the common period of these proxy series, meanwhile, both dynamics and external features of these proxy series are similar on the quasi 100 a and even higher scales. This means that the quasi 100 a and even higher scale components meet with comparable conditions in these aspects. More attention must be paid to this scale when analyzing proxy series. We also found that the similarities in dynamics and external features of these proxy series are reduced as the scale of the components decreaces ; On quasi 60-70 a scale, the component similarities in dynamics features disappear. On quasi 30 a and even lower scale the similarities of external features also disappear.
Acoustic-phonon transmission in multilayer heterojunctions
多层异质结构中的声学声子输运

He Meng-Dong,Gong Zhi-Qiang,
贺梦冬
,龚志强

物理学报 , 2007,
Abstract: Using a transfer matrix method, we investigate the transmission property of the acoustic-phonon modes in symmetrical multilayer heterojunctions consisting of many different heterojunctions (GaAs/AlxiGa1-xiAs) within elastic continuum approximation. Our results show that the oscillation amplitude and frequency are different between transmission curve in such structure and transmission curve in the superlattice (GaAs/AlAs) with the same thicknesses of constituent layers. The features of transmission spectrum are influenced by the distribution of the concentration xi(i denotes the i th AlxiGa1-xiAs slab on both sides of the symmetrical axis) . When the concentration xi in AlxiGa1-xiAs slab decreases with the increase of i, the curve in transmission spectrum is flat except in the vicinity of the main valley. When the concentration xi increases with the increase of i, the oscillation amplitude of the curve increases and the main valley is split. Our results also show that the transmission coefficient is sensitive to the thicknesses of constituent layers, especially the thickness of AlxiGa1-xiAs. In addition, it is found that the number of heterojunctions influences the transmission of acoustic phonon.
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