期刊文献+
共找到159篇文章
< 1 2 8 >
每页显示 20 50 100
Nash Embedding of Witten’s M-Theory and the Hawking-Hartle Quantum Wave of Dark Energy 被引量:2
1
作者 Mohamed S. El Naschie 《Journal of Modern Physics》 2013年第10期1417-1428,共12页
Euclidean embedding of the 11-dimensional M-theory turned out to require a very large space leaving lavish amounts of 242 dimensional pseudo truly empty “regions” devoid of space and time and consequently of anythin... Euclidean embedding of the 11-dimensional M-theory turned out to require a very large space leaving lavish amounts of 242 dimensional pseudo truly empty “regions” devoid of space and time and consequently of anything resembling ordinary physical energy density. It is shown here using Nash embedding that the ratio of “solid” M-theory spacetime to its required embedding “non-spacetime” is 1/22 for a classical theory and 1/22.18033989 for an analogous fractal theory. This then leads to a maximal ordinary energy density equation equal to that of Einstein’s famous formula E=mc2 but multiplied with in full agreement with previous results obtained using relatively more conventional methods including running the electromagnetic fine structure constant in the exact solution of the hydrogen atom. Consequently, the new equation corresponds to a quantum relativity theory which unlike Einstein’s original equation gives quantitative predictions which agree perfectly with the cosmological measurements of WMAP and the analysis of certain supernova events. Never the less in our view dark energy also exists being the energy of the quantum wave amounting to 95.5 present of the total Einstein theoretical energy which is blind to any distinction between ordinary energy of the quantum particle and the dark energy of the quantum wave. However, since measurement leads to the collapse of the Hawking-Hartle quantum wave, dark energy being a quantum wave non-ordinary energy could not possibly be measured in the usual way unless highly refined quantum wave non-demolition technology is developed if possible. It is a further reason that dark energy having a different sign to ordinary energy is the cause behind the anti gravity force which is pushing the universe apart and accelerating cosmic expansion. Consequently it can be seen as the result of anticlastic Cartan-like curvature caused by extra compactified dimensions of spacetime. A simple toy model demonstration of the effect of curvature in a “material” space is briefly discussed. 展开更多
关键词 NASH Euclidean EmBEDDING QUANTUm Entanglement Dark ENERGY of the QUANTUm wave QUANTUm Gravity Ordinary ENERGY of the QUANTUm Particle Hawking-Hartle wave of the Cosmos QUANTUm wave Non-Demolition Witten’s m-THEORY
在线阅读 下载PDF
Dark Energy Explained via the Hawking-Hartle Quantum Wave and the Topology of Cosmic Crystallography 被引量:1
2
作者 Mohamed S. El Naschie Atef Helal 《International Journal of Astronomy and Astrophysics》 2013年第3期318-343,共26页
The aim of the present paper is to explain and accurately calculate the missing dark energy density of the cosmos by scaling the Planck scale and using the methodology of the relatively novel discipline of cosmic crys... The aim of the present paper is to explain and accurately calculate the missing dark energy density of the cosmos by scaling the Planck scale and using the methodology of the relatively novel discipline of cosmic crystallography and Hawking-Hartle quantum wave solution of Wheeler-DeWitt equation. Following this road we arrive at a modified version of Einstein’s energy mass relation E = mc2 which predicts a cosmological energy density in astonishing accord with the WMAP and supernova measurements and analysis. We develop non-constructively what may be termed super symmetric Penrose fractal tiling and find that the isomorphic length of this tiling is equal to the self affinity radius of a universe which resembles an 11 dimensional Hilbert cube or a fractal M-theory with a Hausdorff dimension where. It then turns out that the correct maximal quantum relativity energy-mass equation for intergalactic scales is a simple relativistic scaling, in the sense of Weyl-Nottale, of Einstein’s classical equation, namely EQR = (1/2)(1/) moc2 = 0.0450849 mc2 and that this energy is the ordinary measurable energy density of the quantum particle. This means that almost 95.5% of the energy of the cosmos is dark energy which by quantum particle-wave duality is the absolute value of the energy of the quantum wave and is proportional to the square of the curvature of the curled dimension of spacetime namely where and is Hardy’s probability of quantum entanglement. Because of the quantum wave collapse on measurement this energy cannot be measured using our current technologies. The same result is obtained by involving all the 17 Stein spaces corresponding to 17 types of the wallpaper groups as well as the 230-11=219 three dimensional crystallographic group which gives the number of the first level of massless particle-like states in Heterotic string theory. All these diverse subjects find here a unified view point leading to the same result regarding the missing dark energy of the universe, which turned out to by synonymous with the absolute value of the energy of the Hawking-Hartle quantum wave solution of Wheeler-DeWitt equation while ordinary energy is the energy of the quantum particle into which the Hawking-Hartle wave collapse at cosmic energy measurement. In other words it is in the very act of measurement which causes our inability to measure the “Dark energy of the quantum wave” in any direct way. The only hope if any to detect dark energy and utilize it in nuclear reactors is future development of sophisticated quantum wave non-demolition measurement instruments. 展开更多
关键词 Doubly SPECIAL RELATIVITY Week’s manifold Experimental Test of Einstein’s RELATIVITY Witten’s m-THEORY Ordinary Energy of the QUANTUm Particle Hawking-Hartle wave of Cosmos Crystallographic Symmetry Groups REVISING SPECIAL RELATIVITY
在线阅读 下载PDF
Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves
3
作者 李松林 张先康 樊计昌 《Acta Seismologica Sinica(English Edition)》 EI CSCD 2005年第1期43-52,共10页
The observation of the fault-zone trapped waves was conducted using a seismic line with dense receivers across surface rupture zone of the M=8.1 Kunlun Mountain earthquake. The fault zone trapped waves were separated ... The observation of the fault-zone trapped waves was conducted using a seismic line with dense receivers across surface rupture zone of the M=8.1 Kunlun Mountain earthquake. The fault zone trapped waves were separated from seismograms by numerical filtering and spectral analyzing. The results show that: a) Both explosion and earthquake sources can excite fault-zone trapped waves, as long as they locate in or near the fault zone; b) Most energy of the fault-zone trapped waves concentrates in the fault zone and the amplitudes strongly decay with the distance from observation point to the fault zone; c) Dominant frequencies of the fault-zone trapped waves are related to the width of the fault zone and the velocity of the media in it. The wider the fault zone or the lower the velocity is, the lower the dominant frequencies are; d) For fault zone trapped waves, there exist dispersions; e) Based on the fault zone trapped waves observed in Kunlun Mountain Pass region, the width of the rupture plane is deduced to be about 300 m and is greater than that on the surface. 展开更多
关键词 fault-zone trapped waves m=8.1 Kunlun mountain earthquake seismic rupture plane
在线阅读 下载PDF
EXACT TRAVELING WAVE SOLUTIONS OF MODIFIED ZAKHAROV EQUATIONS FOR PLASMAS WITH A QUANTUM CORRECTION 被引量:4
4
作者 房少梅 郭昌洪 郭柏灵 《Acta Mathematica Scientia》 SCIE CSCD 2012年第3期1073-1082,共10页
In this article, the authors study the exact traveling wave solutions of modified Zakharov equations for plasmas with a quantum correction by hyperbolic tangent function expansion method, hyperbolic secant expansion m... In this article, the authors study the exact traveling wave solutions of modified Zakharov equations for plasmas with a quantum correction by hyperbolic tangent function expansion method, hyperbolic secant expansion method, and Jacobi elliptic function ex- pansion method. They obtain more exact traveling wave solutions including trigonometric function solutions, rational function solutions, and more generally solitary waves, which are called classical bright soliton, W-shaped soliton, and M-shaped soliton. 展开更多
关键词 modified Zakharov equations Quantum correction Exact traveling wave solution Function expansion method m-shaped soliton
在线阅读 下载PDF
Measurement of Rain Attenuation in Terahertz Wave Range 被引量:4
5
作者 Seishiro Ishii Syuji Sayama Toshihisa Kamei 《Wireless Engineering and Technology》 2011年第3期119-124,共6页
Rain attenuation at 355.2 GHz in the terahertz wave range was measured with our new 355.2 GHz measuring system under rainfall intensities up to 25 mm/hr. Rain attenuation coefficients were also calculated using four r... Rain attenuation at 355.2 GHz in the terahertz wave range was measured with our new 355.2 GHz measuring system under rainfall intensities up to 25 mm/hr. Rain attenuation coefficients were also calculated using four raindrop-size distributions, e Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull distributions, and using a specific rain attenuation model for prediction methods recommended by ITU-R. Measurements of a terahertz wave taken at 355.2 GHz were compared with our calculations. Results showed that the propagation experiment was in very good agreement with a calculation from a specific attenuation model for use in prediction method recommended by ITU-R. 展开更多
关键词 TERAHERTZ wave RAIN ATTENUATION Raindrop-Size DISTRIBUTION m-P DISTRIBUTION Weibull DISTRIBUTION ITU-R
暂未订购
Bifurcations of Travelling Wave Solutions for the B(m,n) Equation
6
作者 Minzhi Wei Yujian Gan Shengqiang Tang 《American Journal of Computational Mathematics》 2014年第2期104-118,共15页
Using the bifurcation theory of dynamical systems to a class of nonlinear fourth order analogue of the B(m,n) equation, the existence of solitary wave solutions, periodic cusp wave solutions, compactons solutions, and... Using the bifurcation theory of dynamical systems to a class of nonlinear fourth order analogue of the B(m,n) equation, the existence of solitary wave solutions, periodic cusp wave solutions, compactons solutions, and uncountably infinite many smooth wave solutions are obtained. Under different parametric conditions, various sufficient conditions to guarantee the existence of the above solutions are given. Some exact explicit parametric representations of the above waves are determined. 展开更多
关键词 Solitary wave SOLUTION PERIODIC Cusp wave SOLUTION PERIODIC wave SOLUTION Smoothness of wave B(m n) EQUATION
在线阅读 下载PDF
A Proposed Frequency Spectrum for Fully Developed Wind Waves by Revisiting P-M Spectrum
7
作者 LIU Shouhua JIA Ning GUAN Changlong 《Journal of Ocean University of China》 SCIE CAS 2011年第4期331-335,共5页
It is generally believed that the equilibrium range of wind wave spectrum is in the form of the-4 rather than-5 power law.However,in the widely applied P-M spectrum the equilibrium range is given in the form of-5 powe... It is generally believed that the equilibrium range of wind wave spectrum is in the form of the-4 rather than-5 power law.However,in the widely applied P-M spectrum the equilibrium range is given in the form of-5 power law.In the present paper,a spectrum for full development of wind waves is proposed using the form of the Neumann spectrum,but adopting the-4 power law for the equilibrium range.The proposed spectrum has been verified with NDBC buoy data and could be a substitute for the P-M spectrum. 展开更多
关键词 wind-wave spectrum equilibrium range fully developed P-m spectrum
在线阅读 下载PDF
Travelling Wave Solutions to the m-KdV-Sine-Gordon Equation and the m-KdV-Sinh-Gordon Equation
8
作者 LI Er-qiang CHEN Jin-lan 《Chinese Quarterly Journal of Mathematics》 CSCD 2013年第1期82-86,共5页
By using the function transformation and proper Sub-ODE, exact travelling wave solutions of the m-KdV-Sine-Gordon and the m-KdV-Sinh-Gordon equation are obtained, from which exact travelling wave solutions of the m-Kd... By using the function transformation and proper Sub-ODE, exact travelling wave solutions of the m-KdV-Sine-Gordon and the m-KdV-Sinh-Gordon equation are obtained, from which exact travelling wave solutions of the m-KdV equation, the Sine-Gordon equation and the Sinh-Gordon equation are derived. 展开更多
关键词 function transformation m-KdV-Sine-Gordon equation m-KdV-Sinh-Gordon equation Sub-ODE travelling wave solutions
在线阅读 下载PDF
User Assisted Cooperative Relaying in Beamspace Massive MIMO NOMA Based Systems for Millimeter Wave Communications 被引量:6
9
作者 Jaipreet Kaur Maninder Lal Singh 《China Communications》 SCIE CSCD 2019年第6期103-113,共11页
A novel scheme‘user assisted cooperative relaying in beamspace massive multiple input multiple output(M-MIMO)non-orthogonal multiple access(NOMA)system’has been proposed to improve coverage area,spectrum and energy ... A novel scheme‘user assisted cooperative relaying in beamspace massive multiple input multiple output(M-MIMO)non-orthogonal multiple access(NOMA)system’has been proposed to improve coverage area,spectrum and energy efficiency for millimeter wave(mmWave)communications.A downlink system for M users,where base station(BS)is equipped with beamforming lens antenna structure having NRF radio frequency(RF)chains,has been considered.A dynamic cluster of users is formed within a beam and the intermediate users(in that cluster)between beam source and destination(user)act as relaying stations.By the use of successive interference cancellation(SIC)technique of NOMA within a cluster,the relaying stations relay the symbols with improved power to the destination.For maximizing achievable sum rate,transmit precoding and dynamic power allocation for both intra and inter beam power optimization are implemented.Simulations for performance evaluation are carried out to validate that the proposed system outperforms the conventional beamspace M-MIMO NOMA system for mmWave communications in terms of spectrum and energy efficiency. 展开更多
关键词 cooperative relaying system(CRS) millimeter wave(mmwave) mASSIVE mULTIPLE input mULTIPLE output(m-mImO) non-orthogonal mULTIPLE access(NOmA) power allocation sum rate
在线阅读 下载PDF
推拿对脑瘫小儿胫神经性屈肌M波和F波反应的影响 被引量:12
10
作者 崔荣庆 洪学宾 +1 位作者 魏雨农 张瑞林 《中国康复理论与实践》 CSCD 1997年第1期16-20,共5页
用体表无创伤性双极刺激胫神经的方法,研究了30例脑瘫患儿推拿治疗前、后屈肌肌电M波和F波反应。结果治疗后,肌电阈值降低,患侧M波电压增大,F波降低,左、右脚M和F波基本相等。M波峰潜伏时延长,患侧Fn有意义(P<0.05)。总之,除... 用体表无创伤性双极刺激胫神经的方法,研究了30例脑瘫患儿推拿治疗前、后屈肌肌电M波和F波反应。结果治疗后,肌电阈值降低,患侧M波电压增大,F波降低,左、右脚M和F波基本相等。M波峰潜伏时延长,患侧Fn有意义(P<0.05)。总之,除2倒无变化(7.41%),1例变差(3.7%)外,显效率为25.93%,有效率为88.89%。提示推拿能改善患儿脊髓前角细胞和骨骼肌的功能活动。 展开更多
关键词 脑性瘫痪 胫神经 拇屈肌 推拿 儿童 m F波
暂未订购
并购浪潮与股市波动:基于EMD的相关性检验与解释 被引量:3
11
作者 后锐 伍嘉文 罗智 《系统工程》 CSSCI CSCD 北大核心 2013年第9期44-50,共7页
为了解释中国企业并购潮现象,本文创新性地将并购潮波动信息分解为若干个信号波,并试图利用股市波动信息来解释中国并购潮形成的影响因素。其具体方法是,基于中国证券市场数据和并购活动数据,运用EMD技术将并购活动时间序列和上证指数... 为了解释中国企业并购潮现象,本文创新性地将并购潮波动信息分解为若干个信号波,并试图利用股市波动信息来解释中国并购潮形成的影响因素。其具体方法是,基于中国证券市场数据和并购活动数据,运用EMD技术将并购活动时间序列和上证指数时间序列分解成为多尺度时间序列:趋势项、低频项和高频项3个分量,分别对相应的分量进行Pearson相关性检验发现,并购时间序列的趋势项高度相关、低频项中度相关,而高频项完全不相关。由于股市指数序列承载了足够的宏观经济、政府政策和投资者行为信息,从而可以通过分析股市波动的因素间接地讨论中国企业并购潮的形成原因。研究结果表明,中国宏观经济持续增长是中国并购潮长期波动的主因,而产业结构调整、政府政策和资本市场短期非理性投资行为等则是中国并购潮局部波动的重要因素。 展开更多
关键词 并购浪潮 股票波动 经验模态分解(EmD)
原文传递
山东地区等效剪切波速与30 m等效剪切波速转换研究 被引量:3
12
作者 葛孚刚 王冬雷 +4 位作者 许洪泰 沈得秀 刘霞 陈童 张昭雷 《科学技术与工程》 北大核心 2020年第24期9751-9756,共6页
为实现等效剪切波速向30 m等效剪切波速的转换,根据覆盖层厚度的不同,分两种情况对山东地区等效剪切波速(V se)向30 m等效剪切波速(V S30)的转换进行了研究。当覆盖层厚度≥20 m时,通过最小二乘法拟合V se和V S30的对数线性关系,并与前... 为实现等效剪切波速向30 m等效剪切波速的转换,根据覆盖层厚度的不同,分两种情况对山东地区等效剪切波速(V se)向30 m等效剪切波速(V S30)的转换进行了研究。当覆盖层厚度≥20 m时,通过最小二乘法拟合V se和V S30的对数线性关系,并与前人的研究结果进行对比。当覆盖层厚度<20 m时,采用基岩剪切波速拟合法:首先拟合基岩剪切波速与基岩深度的多项式关系式,然后推导V S30与等效剪切波速、覆盖层厚度、剪切波在基岩内的传播时间的关系式。对基岩剪切波速拟合法的V S30计算值进行验证,相对误差分布于区间[-2.89%,5.26%],相对误差绝对值小于3%的数据占比为87.5%。可见考虑覆盖层、基岩差异的基岩剪切波速拟合法是可行的。 展开更多
关键词 基岩 等效剪切波速 30 m等效剪切波速 拟合
在线阅读 下载PDF
Metal-LHM-Metal三层对称平板波导的传输特性研究 被引量:6
13
作者 许江勇 段国华 +2 位作者 张卫龙 卢强华 高英俊 《广西科学》 CAS 2012年第3期236-238,共3页
在TE极化情况下,对芯层为左手材料,衬底层和覆盖层均为金属的对称平板波导(Metal-LHM-Metal)的传输特性进行研究.利用传输矩阵推导其导波条件,并采用图解法对其不同的传播模式和相应的电场分布进行分析.Metal-LHM-Metal波导结构不存在基... 在TE极化情况下,对芯层为左手材料,衬底层和覆盖层均为金属的对称平板波导(Metal-LHM-Metal)的传输特性进行研究.利用传输矩阵推导其导波条件,并采用图解法对其不同的传播模式和相应的电场分布进行分析.Metal-LHM-Metal波导结构不存在基模,支持导波同时也存在表面波,阶数m对电场分布有显著影响. 展开更多
关键词 左手材料 波导 表面波 传输矩阵
在线阅读 下载PDF
高铁轨道平顺性的150m/300m校验及其快速测量 被引量:12
14
作者 魏晖 朱洪涛 +2 位作者 殷华 蔡军 张苗苗 《铁道工程学报》 EI 北大核心 2015年第1期44-48,54,共6页
研究目的:150 m/300 m矢距差校验作为一类高速铁路轨道长波不平顺控制参数,其物理意义与测量特性并不明确,且计算方法亦依赖于绝对测量,因而限制了其在工务养修中的应用。本文首先通过谐波分析讨论校验公式的测量特性,之后利用基于短弦... 研究目的:150 m/300 m矢距差校验作为一类高速铁路轨道长波不平顺控制参数,其物理意义与测量特性并不明确,且计算方法亦依赖于绝对测量,因而限制了其在工务养修中的应用。本文首先通过谐波分析讨论校验公式的测量特性,之后利用基于短弦中点弦测法的轨道矢距计算通式,推导150 m/300 m矢距差校验的快速算法并进行仿真。研究结论:(1)谐波分析表明:150 m/300 m校验可用于60 m、100 m波长的不平顺幅值的提取但存在相差,而对其他波长不平顺均存在幅频与相频的畸变;(2)150 m/300 m矢距差校验的快速算法直接利用短弦中点矢距数据,避免了横垂偏的求解,具有显著的效率优势;(3)经过对实际路段数据的计算机仿真,验证了该算法的正确性与准确性;(4)相关的分析与算法可用于高速铁路的长波不平顺评价与测量。 展开更多
关键词 高速铁路 150 m/300 m校验 中点弦测法 长波不平顺 频域特性
在线阅读 下载PDF
Jaulent-Miodek方程的行波解分支 被引量:9
15
作者 冯大河 李继彬 《应用数学和力学》 CSCD 北大核心 2007年第8期894-900,共7页
利用平面动力系统分支理论研究了耦合的Jaulent-Miodek方程的孤立波及周期波的存在性,求出了分支参数集.在给定的参数条件下,得到了该方程光滑孤立波解及周期行波解的所有可能的显式表达式.
关键词 J-m方程 孤立波 周期行波解
在线阅读 下载PDF
脑瘫小儿拇屈肌肌电M波和F反应的研究 被引量:1
16
作者 崔荣庆 李宏敏 +1 位作者 张瑞林 洪学宾 《中国康复》 1994年第3期104-108,共5页
采取刺激胫后神经体表无创伤性双极记录方法,研究了20例正常小儿和34例脑瘫小儿的拇屈肌肌电M波和F反应。正常小儿M波出现率100%,F波出现率57%。两波均由先负后正的双相波组成。M波电压2.73~2.77mv,F波0.27~0.29mv,刺激强度与M波电... 采取刺激胫后神经体表无创伤性双极记录方法,研究了20例正常小儿和34例脑瘫小儿的拇屈肌肌电M波和F反应。正常小儿M波出现率100%,F波出现率57%。两波均由先负后正的双相波组成。M波电压2.73~2.77mv,F波0.27~0.29mv,刺激强度与M波电压呈正变,与F波电压呈抛物线样变化。M波峰潜伏时5.78~5.92ms,F波28.93~29.10ms。两波的波形、振幅和潜伏时在左、右足基本相同。与正常小儿相比,脑瘫小儿肌电M波出现率94%,波形多异常,F波出现率达73%。M波电压降低到1.28~1.91mv,F波升高到0.37~0.45mv。M波潜伏时缩短为5.23~5.48ms,F波缩短到27.93~28.19ms,其中患侧有统计学意义。患儿自身左、右脚间的M波和F反应不对称,其中电压差异显著。 展开更多
关键词 m F反应 脑性瘫痪 胫神经 拇屈肌
暂未订购
黄海海底辐射沙洲区的M2潮波 被引量:35
17
作者 张东生 张君伦 《河海大学学报(自然科学版)》 CAS CSCD 1996年第5期35-40,共6页
建立了东中国海潮波数值模型,模拟了M2分潮波的传播,以研究M2分潮波的时空分布与黄海海底辐射沙洲形成和演变规律之间的关系.M2分潮波进入南黄海后,部分受山东半岛阻隔,在半岛以南水域及海州湾呈逆时针旋转.旋转波与后继的... 建立了东中国海潮波数值模型,模拟了M2分潮波的传播,以研究M2分潮波的时空分布与黄海海底辐射沙洲形成和演变规律之间的关系.M2分潮波进入南黄海后,部分受山东半岛阻隔,在半岛以南水域及海州湾呈逆时针旋转.旋转波与后继的南黄海前进波在江苏北部沿海相遇,并在弓京港附近的水域形成潮波辐聚.在辐聚区内,潮差大,流速急,成为塑造海底沙脊间深槽的主要动力条件.7000年前古海岸下M2分潮的数值试验表明,古河口附近的潮波为移动驻波型,其范围刚好与现在的南通市相对应. 展开更多
关键词 黄海海底 辐射沙洲 m2分潮 潮波 海洋地貌
在线阅读 下载PDF
用铁砂研制M型铁氧体吸波材料 被引量:1
18
作者 程圣华 娄明连 胡国光 《材料科学与工程学报》 CAS CSCD 北大核心 2006年第4期600-602,共3页
用铁砂代替Fe2O3采用传统陶瓷烧结工艺,研制出几种M型六角晶系复合铁氧体吸波材料。有的样品最大衰减达到40dB,10dB带宽在4GHz左右,面密度普遍较小,在8-18GHz频率范围内具有良好的微波吸收特性;实验还发现随着厚度的减小,吸收峰... 用铁砂代替Fe2O3采用传统陶瓷烧结工艺,研制出几种M型六角晶系复合铁氧体吸波材料。有的样品最大衰减达到40dB,10dB带宽在4GHz左右,面密度普遍较小,在8-18GHz频率范围内具有良好的微波吸收特性;实验还发现随着厚度的减小,吸收峰的位置逐渐向高频偏移。 展开更多
关键词 铁砂 m型铁氧体 吸波材料
在线阅读 下载PDF
区域数字地震台网近距离面波震级M_S的测定 被引量:2
19
作者 陈祥熊 杨贵 +1 位作者 傅再扬 陈文明 《地震》 CSCD 北大核心 2002年第2期53-59,共7页
使用福建区域数字台网 7个宽带台观测到的 47个发生于台湾地区的浅源强震 (MS≥ 5 )的近距离面波记录 ,量算了水平向乐夫波的最大合成振幅及震中距离 ,测定了所有这些强震的近距离面波震级 MS。并将结果与国家台网公布的远距离平均 MS... 使用福建区域数字台网 7个宽带台观测到的 47个发生于台湾地区的浅源强震 (MS≥ 5 )的近距离面波记录 ,量算了水平向乐夫波的最大合成振幅及震中距离 ,测定了所有这些强震的近距离面波震级 MS。并将结果与国家台网公布的远距离平均 MS震级进行比较和统计分析。结果表明 ,近距离测定的面波震级比远距离测定的 MS有较大偏差。震级越小、距离越近 ,差异越大。对于区域地震台网测定的 MS震级 ,需要做必要的修正 ,才能使其测定结果尽可能接近于国家台网公布的平均 MS震级。文中还讨论了近距离和远距离面波震级测定差异的原因 ,及其修正办法。可供区域数字宽带台网速报本区域发生的近距离强震面波震级时参考。 展开更多
关键词 区域宽带数字地震台网 波形仿真 近距离面波 ms震级修正
在线阅读 下载PDF
n×m涡卷混沌吸引子的研究及硬件实现 被引量:4
20
作者 周武杰 禹思敏 徐伟 《量子电子学报》 CAS CSCD 北大核心 2009年第6期715-721,共7页
提出了产生n×m涡卷混沌吸引子的一种新方法,用三角波函数序列和阶跃函数序列构造网格多涡卷混沌系统,找出函数中平衡点和转折点的值,并对系统的基本动力学特性进行了研究,包括理论分析和计算机模拟仿真。用模块化的方法设计了现场... 提出了产生n×m涡卷混沌吸引子的一种新方法,用三角波函数序列和阶跃函数序列构造网格多涡卷混沌系统,找出函数中平衡点和转折点的值,并对系统的基本动力学特性进行了研究,包括理论分析和计算机模拟仿真。用模块化的方法设计了现场可编程门阵列(FPGA)硬件实验电路,给出了相关的实验结果。计算机仿真和FPGA硬件实验结果相吻合,由此证明了该系统的混沌特性。 展开更多
关键词 混沌 N × m涡卷混沌吸引子 三角波函数序列 阶跃函数序列 FPGA硬件实现
在线阅读 下载PDF
上一页 1 2 8 下一页 到第
使用帮助 返回顶部