Results 11 to 20 of about 432,453 (195)
Seismic Behavior of a Bridge with New Composite Tall Piers under Near-Fault Ground Motion Conditions
Applied Sciences, 2020 Currently, the seismic designs of reinforced concrete (RC) bridges with tall piers are often accomplished following the ductility-based seismic design method.
Zhehan Cai +4 more
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Buildings, 2022 This paper presents a comparison of P-Delta effects on the nonlinear seismic behavior of the steel moment-resisting frame structures (MRFs) subjected to near-fault and far-fault ground motions.
Hu Cheng +5 more
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Aortic Pulse Wave Velocity and Carotid-Femoral Pulse Wave Velocity: Similarities and Discrepancies [PDF]
Hypertension Research, 2007 The objectives of this study were to determine the relationship between carotid-femoral (cfPWV) and aortic pulse wave velocity (aPWV) and to compare their modulators and association with coronary artery disease (CAD). We studied 107 consecutive patients (68 men) with a mean age of 60.49+/-8.31 years who had stable angina and had been referred for ...
Podolec, Piotr +9 more
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Dizhen xuebao, 2020 基于美国NGA数据库，在断层投影距小于25 km范围内挑选了1387条地震加速度记录，分别按照断层距和场地条件进行分组，对近断层速度脉冲型地震动的频谱特性、特征周期，及其与断层距、震级的相关性予以分析。结果显示：① 出现速度脉冲型地震动的比例与断层投影距之间存在明显的线性相关关系，但其与震级的变化不相关；② 地震动速度脉冲周期与震级之间存在强相关；③ 对于近断层速度脉冲型地震动，采用动态变化的加速度和速度反应谱峰值周期进行特征周期的计算，更加符合真实情况；④ 地震动速度脉冲有放大地震动特征周期的作用 ...
Ruifang Yu +4 more
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International Journal of Economic and Environment Geology, 2022 The ultrasonic pulse velocity and slake durability index are the indirect techniques used widely for rock strength determination. Various experimental studies like slake durability apparatus, ultrasonic pulse velocity and ...
Naeem Abbasi +3 more
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Pulse velocity in a granular chain [PDF]
Physical Review E, 2004 We discuss the applicability of two very different analytic approaches to the study of pulse propagation in a chain of particles interacting via a Hertz potential, namely, a continuum model and a binary collision approximation. While both methods capture some qualitative features equally well, the first is quantitatively good for softer potentials and ...
Rosas, Alexandre, Lindenberg, Katja
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Relationship Between Asperities and Velocity Pulse Generation Mechanism
Frontiers in Earth Science, 2022 Near-fault ground motion records often capture instances of pulse-like behavior, where a burst of energy is expressed as large wave amplitude that occur over short time.
Lu Han +4 more
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Prediction of concrete strength using ultrasonic pulse velocity and artificial neural networks [PDF]
, 2009 Ultrasonic pulse velocity technique is one of the most popular non-destructive techniques used in the assessment of concrete properties. However, it is very difficult to accurately evaluate the concrete compressive strength with this method since the ...
Ali +14 more
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Dizhen xuebao, 2022 以1979年MW6.5帝王谷地震为例，比较了小波变换法、峰点法（PPM）和零点法（ZVPM）识别近断层速度脉冲型强震记录的能力，三种方法识别出的脉冲峰值基本一致，脉冲周期略有差别。为分析速度脉冲的产生机制，包括产生时间、位置以及凹凸体的影响，借助频率-波数域格林函数法（FK法）合成近断层宽频带地震动，采用峰点法逐步识别各子源地震动叠加过程中产生的速度脉冲。通过时频方法分析叠加过程中子源地震动频率成分的变化，分析凹凸体和台站的空间关系对脉冲产生的影响，初步探讨近断层速度脉冲的产生机制。
Lu Han +3 more
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Noise sensitivity of an atomic velocity sensor [PDF]
, 2005 We use Bloch oscillations to accelerate coherently Rubidium atoms. The variation of the velocity induced by this acceleration is an integer number times the recoil velocity due to the absorption of one photon. The measurement of the velocity variation is
Battesti +15 more
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