Gas fracturing, which overcomes the limitation of hydraulic is a potential alternative technology for development unconventional gas and oil resources. However, mechanical principle fracturing has not been learned comprehensively when fluid injected into borehole. In this paper, damagebased model coupled thermal-flowing-mechanical effects was adopted to illustrate fracturing. Numerical simulation tools Comsol Multiphysics Matlab were integrated simulate process during Besides, damage...

Suction caisson is a new offshore wind power foundation structure developed in recent years. Understanding its penetration characteristics crucial to the successful application. A field test was conducted eastern waters of Rudong, Jiangsu Province, China, investigate process suction caisson. The results demonstrate that can penetrate smoothly predetermined elevation seabed soil under complex environmental loads, such as natural and wave currents. inclination only 0.018° once complete. pore...

At present, the proportion of new energy sources such as wind power and photovoltaic in system is gradually increasing, flexibility has become one important evaluation criteria for safe stable operation current future systems. As a measure its ability to respond uncertain events, reasonable quantification analysis system's prerequisite. This paper, quantified under two time scales 15min 1h, then indicators are proposed ramp gap peak-shaving gap. Finally, according actual data regional grid,...

There is great randomness in determining geotechnical parameters, resulting an uncertain local site effect caused by seismic wave scattering such as valleys, hills, basins, etc. It significant to develop the probability-based assessment method quantify considering geo-property uncertainty. The multiplicative dimensional reduction (M-DRM) employed approximate statistical moments of response topography with random parameters. A multi-dimensional problem converted into a series deterministic...

The new style composite foundation is composed of the concrete-cored sand-gravel pile, soil between piles and cushion.According work condition under embankment, considering annular drainage section columns foundation, control equation analytical solution was obtained, average degree consolidation were given.Finally comparison calculated results filed measured data showed that excess pore water pressure, settlement-time relationship consistent with those field respectively.

This study investigated the random scattering effect in sedimentary basins with uncertain geotechnical parameters under vertical SV waves using multiplicative dimensional reduction method. The influence of depth-to-radius ratio and variability on was explored. results indicate that significantly amplifies uncertainty. displacement amplitude factors is affected by basins, providing a 2- or 3-time difference high-frequency waves. coefficient variations has nonlinear amplification relationship...

As a new type of offshore wind foundation, the wide‐shallow bucket foundation with honeycomb bulkheads mainly bears vertical, horizontal, and moment loads. yet, no systematic study has been conducted regarding effects on undrained bearing capacities foundation. In this study, large number three‐dimensional (3D) finite element (FE) analyses were performed to investigate foundations without bulkheads, thereby evaluating influence under different conditions. The results show that uniaxial...

In the fifth-generation (5G) new radio (NR), angle-of-arrival (AoA) information is essential for many applications such as user tracking, positioning service, and beamforming procedures. Traditional AoA estimation methods can not be directly utilized in commercial 5G systems due to imperfections of hardware multi-carrier characteristics signals. this paper, we exploit wideband sounding reference signal (SRS) based on devices. We first develop method measuring physical SRS calibrating...

针对数字微镜器件（digital micromirror device，DMD）衍射效应对系统成像影响严重的问题，对DMD元件产生的杂散光进行研究。基于严格耦合波理论构建了DMD衍射模型，分析不同波段和入射角度对其衍射效率的影响，分析结果表明，在长波红外波段DMD衍射效应较明显，且随着入射角度增大，DMD衍射效应更为显著。分析投影系统中DMD的衍射杂光产生途径，通过改变系统的<i>F</i>数来控制入射角度，计算出DMD衍射效应产生的杂光能量占比，给出不同波长下，不同<i>F</i>数的光学系统杂光随衍射效应的变化曲线，即<i>F</i>数越大，DMD衍射效应对系统杂光影响越小。

<title>Abstract</title> The source uncertainty causes spatial variability of ground motions in mountain-valley sites near the fault. This study aims to analyze how propagation model affects near-fault and local site effect when there is a area. considers asperity intensity rupture velocity by random variables, randomness position initial point setting three scenarios. impact on compared, correlation between motion fault distance dip angle discussed. To solve multi-dimensional problems,...

In recent years, rainstorm disasters have occurred frequently, which serious impact on power grids. The identification of weak points in grids is the key to disaster relief under disasters. existing vulnerability methods only measure importance nodes based network topology, and fail fully integrate equipment criteria, where research gap remains. This paper proposes a method for ranking combining characteristics complex indicators rainfall characteristics. Based structural nodes, this...

Abstract In order to study the effect of honeycomb bulkheads on uniaxial undrained bearing capacities wide-shallow bucket foundation, finite element models foundations with and without soft ground were established respectively. A large number 3D analyses have been performed obtain two different embedment ratios soil shear strength heterogeneity by using displacement control method. The results show that, for homogenous clay, all vertical, horizontal moment foundation are not affected...