Abstract This study aims to develop a high‐precision and cost‐efficient method for the three‐dimensional reconstruction of large particles in natural gravel blasted rock fragments, utilizing Structure from Motion (SfM) Multi‐View Stereo (MVS) techniques. The proposed approach was applied characterize morphology rockfill dam materials at real construction site. Particle shape quantitatively analyzed using indices sphericity, convexity, angularity. predominant is characterized as slightly...

Underground structures in liquefiable ground are prone to severe earthquake damage, and the seismic responses of such underground can be affected by nearby superstructures. Two centrifuge shaking table tests on a precast structure with without superstructure above it mildly inclined were designed conducted this study. The response was analyzed terms its acceleration, deformation, internal force, waterproof performance. influence response, including deformations forces, investigated comparing...

The Shack–Hartmann wavefront sensor (SHWFS) is widely utilized for ocular aberration measurement. However, large aberrations caused by individual differences can easily make the spot move out of range corresponding sub-aperture in SHWFS, rendering traditional centroiding method ineffective. This study applied a novel convolutional neural network (CNN) model to sensing dynamic simulation results demonstrate that, compared modal method, our main low-order system increased 1.86 43.88 times...

In this study, model pile tests were carried out in a custom-made pressurized chamber to explore the mechanisms of driven setup dry sand. A bender element system and tactile pressure sensors used parallel monitor stiffness stress changes soil surrounding during test. The experimental results demonstrate that is not caused by increase at-rest radial σrp′. Instead, it mainly attributed loading Δσrp′, as result aging (or creep). Pile installation pushes side, thereby imposing additional on...

Gravity dams are important infrastructures, and their failure can affect public security. In this work, physical modeling was conducted to determine the dynamic responses types of damage gravity subjected underwater explosions. Five tests under different impoundment levels, centrifugal accelerations, standoff distances, detonation depth, equivalent weights were performed in a centrifuge. The mechanism dam analyzed. peak strain displacement by shock wave bubble pulse both reached when...

Abstract Bubble oscillations generated by underwater explosions (UNDEX) can cause considerable damage to nearby marine vehicles or hydraulic structures as the energy inside bubble is comparable that of a shock wave. Since both compressibility and gravity affect impulse, it not easy reproduce pulse pressure experiments in vacuum tanks pressurized tanks. This study presents promising prospect using centrifuge model motion. Primarily, influence gravitational acceleration on oscillation...

The aim of this research is to investigate the relationship between spinal flexion and quadruped locomotion in a rat robot equipped with compliant spine, controlled by central pattern generator (CPG). study reveals that can enhance limb stride length, but it may also cause significant unexpected motion disturbances during length variations. To address issue, paper proposes CPG model driven novel oscillator incorporates circular limit cycle accounts for anticipated transition process. This...

As a complex process, an underwater explosion is affected by different factors. Shock factors are variables used to characterize the severity of shock based on scaling laws, which conventionally designate effect target. To reveal mechanism involved in dynamic response air-backed plate induced explosion, this study established new factor explain explosion. The was defined as total energy impacting structure that subjected spherical wave. validate effectiveness factor, both numerical and...

Abstract In this study, an innovative experimental setup for model pile tests was developed to characterize friction fatigue in sand during cyclic jacking. the setup, a high-performance precision electric linear actuator used control jacking of piles. P-wave tomographic imaging associated changes distribution velocities soil, and tactile pressure sensors were utilized monitor related variations stresses soil surrounding pile. Measurements obtained from experiments allow us explore behavior...

Abstract To prevent the rapid postharvest browning, litchi fruits can be fumigated with SO 2 , followed by a hydrochloric acid (HCl) dip to restore their red colour. Most fungal decay agents are sensitive fumigation or acidification but treated highly infection Penicillium commune and closely related species. The present study examined whether addition of weak organic acids pH homeostasis inhibitors, alone in combination, could effectively control growth under physiological conditions that...

With the advancement of water conservancy projects around world, several concrete-face rockfill dams (CFRDs) are being built in earthquake-prone areas. Among many factors affecting seismic safety a CFRD, dam–reservoir interaction is most important one. Dam–reservoir impacts dynamic response and deformation dam further influences behavior face slab. This study conducted two centrifuge experiments to analyze influence on CFRD. Experimental models slab with without an impoundment four...