Recent advancements in reprogrammable metamaterials have enabled the development of intelligent matters with variable special properties situ. These employ intra-element physical reconfiguration and inter-element structural transformation. However, existing mono-characteristic homo-element mechanical limited reprogramming functions. Here, we introduce a metamaterial composed origami elements heterogeneous properties, which achieves various behavior patterns by functional group...

The bubble size distribution (BSD) in hydrodynamic cloud cavitation is poorly understood, spite of its importance erosion and noise. Challenges arise owing to the heterogeneous turbulent flows high void fraction regime. use a fiber optical probe enables us obtain BSD cloud. Two distinct power law scalings at early stage are identified. first generation bubbles produced by fission shedding pocket large-scale turbulence, whose isotropic part leads basic scaling −10/3, while anisotropic due...

In this work, the entrainment characteristics of two different non-circular orifice impinging jets, i.e., elliptical and square orifices, are studied against circular one. These three jets at same impinging-distance-to-diameter H/De = 3.0 Reynolds number (Re) 1.6 × 103 were measured by time-resolved tomographic particle image velocimetry. The macroscopic flow structures local discussed in terms Eulerian Lagrangian perspectives, respectively. For both streamwise velocity finite-time Lyapunov...

Data assimilation (DA) integrating limited experimental data and computational fluid dynamics is applied to improve the prediction accuracy of flow behavior in a large-scale steam generator (SG) system. The ensemble Kalman filter (EnKF) used as DA technique, Reynolds-averaged Navier–Stokes (RANS) modeling serves framework. Two configurations—wet stator motor pump canned pump—are tested at three different rates. model constants, derived from EnKF-based approach our previous work, [Li et al.,...

Abstract This paper introduces a high-precision and nearly single-pixel three-dimensional (3D) calibration framework for the camera system optical transfer function (OTF); using digital micromirror device (DMD) to generate large number of 3D points, precise reconstruction 2D reprojection particle-based velocimetry techniques is achieved. Additionally, line-of-sight (LOS) approach, which utilizes an extensive LOSs from points centers, leverages accurate reconstruction—even in presence curved...

``Singing of a cavitating tip vortex'' (SCTV) occurs in the transition process between strong and weak vortex cavitations. It is shown that generation mechanism SCTV one kind resonance cylindrical bubble at its natural frequency.

The present study used a mild contusion injury in rat spinal cord to determine that thymoquinone reduces inflammatory response, oxidative stress and apoptosis (SCI) model demonstrate its possible molecular mechanisms. rats the group received 30 mg/kg once daily by intragastric administration from 3 weeks after surgery. Hematoxylin eosin staining, Basso, Beattie Bresnahan (BBB) scale tissue water content detection were analyze effect of on SCI. activity response mediators, factors caspase-3/9...

The vertical water-entry of a cylinder with flat bottom at high-speed impact velocity is investigated numerically in this paper. multiphase solver based on the reduced five-equation model and adopts pressure relaxation method. fluid assumed as inviscid compressible. effect gravity neglected because high Froude number short loading period. A series numerical experiments are conducted, influence aeration slamming loads studied. results show that compressibility important increases acoustic...

Abstract Avian feather intricate adaptable architecture to wing deformations has catalyzed interest in feathered flapping-wing aircraft with high maneuverability, agility, and stealth. Yet, mimic avian integrated somatic sensation within stringent weight constraints, remains challenging. Here, we propose an avian-inspired embodied perception approach for biohybrid robots. Our feather-piezoelectric mechanoreceptor leverages feather-based vibration structures flexible piezoelectric materials...

To analyze the spatial-temporal features of sheet/cloud cavitating flows, a frequency-weighted dynamic mode decomposition (DMD) approach was proposed. A series physical experiments with flow around NACA (National Advisory Committee for Aeronautics) 0012 hydrofoil were conducted different cavitation numbers, where side- and bottom-view images cloud recorded by two high-speed cameras. Higher modes could be easily clearly identified analyzing image differences between adjacent snapshots in time...

Abstract In this study, a novel analytical method combining 3D continuum model, Biot propagation theory, fictitious saturated soil pile (FSSP) and heterogeneous model is proposed to analyze the dynamic response of defective floating embedded in soils. The vertical velocity frequency domain obtained by introducing complete coupling conditions soil. With most widely used half‐sine pulse as excitation force low‐strain integrity testing pile, solution extended time using inverse Fourier...

Abstract Cavitation inception in tip leakage flows remains a challenging topic the engineering field, as effect of gap width on is unclear. The present study devoted to an analysis cavitation by using full-wetted numerical simulations. Numerical results show that number strongly related dimensionless τ, which defined ratio maximum hydrofoil thickness, and reason behind it explained specific flow structures. suction side (SS) sheet decreases gradually with increase gap. numbers vortex (TLV)...

Osteoarthritis is the most prevalent joint degenerative disease and has been considered a major cause of severe pain physical disability in elderly. The chondrocyte only cell type found articular cartilage senescence plays pivotal role pathogenesis osteoarthritis. Apremilast an oral PDE4 inhibitor used for treatment patients with active psoriatic arthritis. In present study, biological function apremilast was examined interleukin (IL)‑17‑treated model. Expression levels target genes proteins...