The Chang 8 reservoir of the Maling Oilfield in Ordos Basin, China is facing a series challenges hydrocarbon resource development, including rapidly decreasing production rates, declining dynamic fluid levels, and elevated water cuts oil wells, along with heterogeneity microscopic pore-throat structures notable interstratal inconsistencies. To systematically address these issues, this study selected representative samples from conducted rigorous percolation experiments on them. A...

To study the influence of random seismic responses on structure a large-span double-deck steel truss cable-stayed bridges under effects high-intensity rare earthquakes, new power spectral model was proposed based improvements to existing spectra for fitting improved responses. The bridge finite element established using ANSYS employed as an engineering example computational analysis investigate whether spectrum exhibited better adaptability and feasibility earthquake compared with other...

The Ordovician carbonate formations in the Ordos Basin provide a crucial stratigraphic unit for prospective oil and gas exploration. Significant progress has been made exploration of natural within subsalt formations. Nonetheless, understanding its accumulating properties requires additional investigation. Clarifying formation periods rock reservoirs Majiagou Formation basin can furnish theoretical foundation advanced gas. This study uses fluid inclusion petrography, laser Raman...

We study the sliding friction of poly(vinyl alcohol) (PVA) gel against glass substrate in hyaluronan (HA) aqueous solution with various concentrations and two molecular weights. The frictional stress decreases increase concentration HA at low velocity, lowest appears 10c* (c* is overlap concentration) solution; after that, it increases slightly concentration. By assuming that a continuous lubricant layer formed interface, which screens PVA adsorption to substrate, we estimate thickness...

Abstract Deep concrete beams often feature web openings that disrupt the flow of forces from loads to supports and reduce shear strength member. While such can significantly impact safety level structure, research on deep has been focused mostly behavior solid members. To address this issue, paper proposes a new model for with rectangular stems two‐parameter kinematic theory (2PKT) beams. The is established based an analysis failure modes test specimens using nonlinear finite element...

The dynamic stability of a rutting test does not optimally reflect the high-temperature asphalt mixtures. In this study, was performed over long duration (4 h) at different temperatures (40, 50, 60, 70 °C) for three mixtures, namely, matrix AC-16, SMA-16, and modified AC-16 Subsequently, temperature rate obtained after considering annual conditions Guangdong Beijing in China. Because were from that actual pavement, rut depth calculated using rate. This modification considered four factors:...

Abstract Uplift and exhumation are important factors affecting the preservation of deposits. The anatomy uplift‐cooling evolution in East Longshou Mountain is significant research value understanding changes Jinchuan Ni‐Cu‐PGE deposit since its formation. This study uses apatite fission track (AFT) thermochronology to reconstruct thermal history Mountain, including mine, revealing uplift elucidating status deposit. AFT ages distributed from 62.3 ± 3.0 Ma 214.7 14 Ma, with differences...

Abstract While tests of deep fiber‐reinforced concrete (FRC) beams have shown that steel fibers enhance the crack control and shear strength, modeling these effects in a simple rational manner remains challenging problem. Because FRC features enhanced tension behavior, it is not well suited for traditional strut‐and‐tie approach which neglects tensile strength concrete. Therefore, this paper proposes an alternative focuses on displacements critical cracks. The are described with kinematic...

Reinforced concrete (RC) coupling beams in pre-1970s coupled-wall structures often feature a small number of stirrups, and thus are susceptible to shear failure along inclined cracks. In short with span-to-depth ratio smaller than about 2.5, the occurs diagonal cracks can limit ductility member, which turn limits seismic performance entire system. To suppress tension failure, be strengthened externally bonded fiber-reinforced polymer (FRP) sheets. However, as FRP sheets exhibit debonding...

Timber boardwalk decks are widely installed in parks and scenic areas to provide pedestrians an elevated footpath as well harmony with the surrounding natural scene. In order extend lifespan of boardwalks outdoor environment, industrially treated pine timber, such Pinus sylvestris, is often adopted. However, accidents injured by damaged have been constantly reported. Therefore, mechanical behavior two different types timber was examined this study under repeated wetting drying. An increasing...

The response surface method (RSM) was used to construct the explicit equation between design parameters and structure response. This also analyze sensitivity of parameters. Accordingly, influence degree various on long-span cable-stayed bridge analyzed. factors solved through could show tendency internal force, deformation, cable force a under condition changing These were divided into four importance ratings according percentage value. task quantitatively distinguish structural provide...

Due to its advantages of easy deployment and high stiffness-to-mass ratio, the utilization truss structures for constructing large satellites presents an appealing solution modern space missions, including Earth observation astronomy. However, dimensions traditional finite element model a satellite with structure become exceedingly as structure’s size increases. The control system design process based on is complex time-consuming. This paper employs continuum modeling method represent...

A decision feedback detection scheme for differentially encoded MPSK signals based on the maximum likelihood algorithm is proposed. The performance symbol error rate of system an AWGN channel derived by taking propagation into account. can be stopped introducing technique.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

The downtime problem of wind turbine increases due to fatigue damage blades, which is even more crucial in the larger blades. One critical failure modes blade trailing edge failure, can result joint cracked. In this paper, we experienced that abnormal sound was happened at cross-section max chord during testing a 2 MW full-scale according IEC61400-23. Through conditional monitoring edge, delamination between GFRP and balsa wood caused by stress concentration. beat when vibrates edgewise...

For dynamic process planning under reconfigurable manufacturing system (RMS), the method of based on similarity theory was presented. Part feature description built as well case index structure. Procedure combination principia suited for machine tool (RMT) and sort rule relation among features were given. Similarity information created by comparability judgment part multiple-tree, procedure combined agglomerative hierarchical clustering method, every working-step sorted in group. Moreover,...

In compressed sensing, sparse and compressible signals can be characterized at low sampling rate. this paper, we focus on locating sub bands frequency adaptively over wideband based sensing wavelet edge detection. Based this, double threshold energy detection of cooperative spectrum is implemented. The analytical results indicate that novel algorithm has a good performance in finding holes while requiring less A/D conversion. simulation show under proposed scheme, probability improves more...