A5080711509- Advanced Materials and Mechanics
- Cellular Mechanics and Interactions
- Elasticity and Material Modeling
- Plant and Biological Electrophysiology Studies
- Calcium Carbonate Crystallization and Inhibition
- Kidney Stones and Urolithiasis Treatments
- Structural Analysis and Optimization
- Cephalopods and Marine Biology
- Micro and Nano Robotics
- Plant Molecular Biology Research
- Modular Robots and Swarm Intelligence
- Fluid Dynamics and Turbulent Flows
- Cancer Cells and Metastasis
- Mathematical Biology Tumor Growth
- Force Microscopy Techniques and Applications
- Adhesion, Friction, and Surface Interactions
- Soft Robotics and Applications
- Fluid Dynamics and Thin Films
- Pediatric Urology and Nephrology Studies
- Biocrusts and Microbial Ecology
- Caveolin-1 and cellular processes
- Rheology and Fluid Dynamics Studies
- Tree Root and Stability Studies
- Plant Diversity and Evolution
- Greenhouse Technology and Climate Control
University of Oxford
2015-2024
Stanford University
2024
Google (United States)
2016
University of Arizona
2009-2013
Memorial Sloan Kettering Cancer Center
2010
University of Delaware
2007-2008
We consider the dynamic snapping instability of elastic beams and shells.Using Kirchhoff rod Föppl-von Kármán plate equations, we study stability, deformation modes, snap-through dynamics an arch with clamped boundaries subject to a concentrated load.For parameters typical everyday technological applications snapping, show that stretchability plays critical role in determining not only postbuckling mode but also timescale frequency arch's vibrations about its final equilibrium state.We...
We demonstrate the passive control of viscous flow in a channel by using an elastic arch embedded flow. Depending on fluid flux, may `snap' between two states --- constricting and unconstricting that differ hydraulic conductivity up to order magnitude. use combination experiments at macroscopic scale theory study states, determine critical flux required transition them. show such device be precisely tuned for range applications, particular has potential as microfluidic fuse prevent excessive...
Abstract The coupling between community composition and climate change spans a gradient from no lags to strong lags. no‐lag hypothesis is the foundation of many ecophysiological models, correlative species distribution modelling reconstruction approaches. Simple lag hypotheses have become prominent in disequilibrium ecology, proposing that communities track following fixed function or with time delay. However, more complex dynamics are possible may lead memory effects alternate unstable...
Significance To survive and to thrive, plants rely on their ability sense multiple environmental signals, such as gravity or light, respond them by growing changing shape. do so, the signals must be transduced down cellular level create physical deformations leading shape changes. We propose a multiscale theory of tropism that takes stimuli transforms into auxin transport drives tissue-level growth remodeling, thus modifying plant position with respect stimuli. This feedback loop can...
We study the dynamics of snap-through when viscoelastic effects are present. To gain analytical insight we analyse a modified form Mises truss, single-degree-of-freedom structure, which features an ‘inverted’ shape that snaps to ‘natural’ shape. Motivated by anomalously slow exhibited spherical elastic caps, consider thought experiment in truss is first indented inverted state and allowed relax while specified displacement maintained; constraint imposed then removed. Focussing on for limit...
One of the key problems in active materials is control shape through actuation. A fascinating example such elephant trunk, a long, muscular, and extremely dexterous organ with multiple vital functions. The trunk an object fascination for biologists, physicists, children alike. Its versatility relies on intricate interplay unique physical mechanisms biological design principles. Here, we explore these principles using theory filaments build, theoretically, computationally, experimentally,...
Convergent evolution is a phenomenon whereby similar traits evolved independently in not closely related species, and often interpreted functional terms. Spines mollusk seashells are classically as having repeatedly defense response to shell-crushing predators. Here we consider the morphogenetic process that shapes these structures underlies their repeated emergence. We develop mathematical model for spine morphogenesis based on mechanical interaction between secreting mantle edge calcified...
Airway remodeling in patients with chronic asthma is characterized by a thickening of the airway walls. It has been demonstrated previous theoretical models that this change thickness can have an important mechanical effect on properties wall, particular phenomenon mucosal folding induced smooth muscle contraction. In paper, we present model for context growth. The modeled as bilayered cylindrical tube, both geometric and material nonlinearities accounted via theory finite elasticity. Growth...
In many filamentary structures, such as hydrostatic arms, roots, and stems, the active or growing part of material depends on contractile elongating fibers. Through their activation by muscular contraction growth, these fibers will generate internal stresses that are partially relieved filament acquiring intrinsic torsion curvature. This process is fundamental in morphogenesis but also plant tropism, nematic solid activation, motion organs elephant trunks octopus arms. Here, we provide a...
Abstract We derive a general constitutive model for nematic liquid crystalline rods. Our approach consists in reducing the three-dimensional strain-energy density of cylindrical structure to one-dimensional energy rod. The reduced connects directly optothermal stimulation generation intrinsic curvature, extension, torsion, and twist, is applicable wide range rods subject external stimuli mechanical loads. For illustration, we obtain shape clamped rod under uniform illumination, compute...
Due to an infinite number of degrees freedom, soft robotic arms remain challenging control when underactuated. Past work has drawn inspiration from biological structures–for example the elephant trunk–to design and biomimetic arms. However, date, models used inform lack generalizability, largely rely on qualitative assumptions. Here, we present a computationally efficient methodology fiber-based slender inspired by theory active filaments. Our approach seeks optimize fibrillar activation...
Elastic cavitation is a well-known physical process by which elastic materials under stress can open cavities. Usually, induced applied loads on the body. However, growing may generate stresses in absence of and could induce cavity opening. Here, we demonstrate possibility spontaneous growth-induced consider implications this phenomenon to biological tissues particular problem schizogenous aerenchyma formation.
The idea that physical processes involved in biological development underlie morphogenetic rules and channel morphological evolution has been central to the rise of evolutionary developmental biology. Here, we explore this context seashell morphogenesis. We show a morphomechanical model predicts effects variations shell shape on ornamental pattern ammonites, now extinct group cephalopods with external chambered shell. Our shows several seemingly unrelated characteristics synchronous,...