Results 21 to 30 of about 3,284,133 (290)
Discovery of 5.16s pulsations from the isolated neutron star RBS 1223 [PDF]
, 2001 The isolated neutron star candidate RBS 1223 was observed with the Advanced CCD Imaging Spectrometer aboard the Chandra X-ray observatory on 2000 June 24. A timing analysis of the data yielded a periodic modulation with a period P=5.1571696^(+1.57*10^(-4)
A. D. Schwope +39 more
core +3 more sources
Transmission characteristics of finite periodic dielectric waveguides
Optics Express, 2006 Transmission properties of the periodic dielectric waveguide (PDWG) formed by aligning a sequence of dielectric cylinders in air are investigated theoretically. Unlike photonic crystal waveguides (PCWs), light confinement in a PDWG is due to total internal reflection.
Pi-Gang, Luan, Kao-Der, Chang
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Dizhen xuebao为探究不同场地类别对反应谱特征周期的影响，建立了包含四种场地类别的180个计算剖面，在现行 《建筑抗震设计规范》 GB 50011—2010中场地分类的基础上按照土的软硬程度进一步细分，以不同幅值的El Centro地震动作为输入地震动，采用一维等效线性化方法进行土层反应分析，计算得到场地地震动反应谱，规准化得到反应谱特征周期。结果表明：① 在同一类别场地中，随着等效剪切波速的增大，特征周期呈减小的趋势；② 在同一类别场地中，随着输入地震动强度的增大，特征周期也相应增大；③ 在不同类别场地中 ...
Ping Li +5 more
doaj +1 more source
Dizhen xuebao在分析场地条件对地震震害影响及国内外关于软弱土层对场地地震反应影响的基础上，采用实际含淤泥质土层场地资料，建立了12个含软弱土层的场地模型，在不同输入地震动水平下进行了场地地震反应一维等效线性化分析，讨论了软弱土层厚度和埋深对场地地震反应的影响。结果表明：随着软弱土层的埋深或厚度的增加，反应谱特征周期逐渐增大；输入地震动峰值增加，反应谱特征周期亦增大。继而依据软弱土层厚度、埋深及输入地震动强度对场地加速度反应谱特征周期的影响特征，提出了含软弱土层场地地震动加速度反应谱特征周期调整方法。
Zhen Chen +5 more
doaj +1 more source
Hierarchy of Chaotic Maps with an Invariant Measure
, 2000 We give hierarchy of one-parameter family F(a,x) of maps of the interval [0,1] with an invariant measure. Using the measure, we calculate Kolmogorov-Sinai entropy, or equivalently Lyapunov characteristic exponent, of these maps analytically, where the ...
Blank +10 more
core +2 more sources
Simultaneous detection of the nonlinear restoring and excitation of a forced nonlinear oscillation: an integral approach [PDF]
, 2015 We address in this article, how to calculate the restoring characteristic and the excitation of a nonlinear forced oscillating system. Under the assumption that the forced nonlinear oscillator has a periodic solution with period, we constructed a system ...
Ahmad, Fayyaz +3 more
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Block bootstrap for periodic characteristics of periodically correlated time series [PDF]
Journal of Nonparametric Statistics, 2017 This research is dedicated to the study of periodic characteristics of periodically correlated time series such as seasonal means, seasonal variances and autocovariance functions. Two bootstrap methods are used: the extension of the usual Moving Block Bootstrap (EMBB) and the Generalized Seasonal Block Bootstrap (GSBB). The first approach is proposed,
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Applied SciencesThis study was based on a target spectrum (GB183062015) and synthesized different characteristic periods, pulse ground motions, and non-pulse ground motions utilizing EQsignal v1.2.1 software. It also investigated the dynamic behaviors of bridge piers in
Gaojie Yun, Chunguang Liu
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Study on effect of gas-liquid two phase physical feature on slug flow in microchannels
Frontiers in Physics, 2023 At present, there are relatively few studies on the slug flow generation mode obtained by exchanging gas-liquid two-phase inlets. In this study, an experimental system combining microfluidic devices and high-speed cameras was used to study the effects of
Lin lin Wang
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The comparative characteristic of extra- and intracranial hemodynamics in patients with traumatic brain injury in the long-term period. [PDF]
Medičnì Perspektivi, 2017 Traumatic brain injury (TBI) remains an actual problem of modern medicine, as well as of economic and social sectors. Vascular factor plays a leading role in forming of the clinical presentation of the disease in the long-term period of TBI.
V. M. Shkolnyk +2 more
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