Browsing by Author "Mahadevan, Lakshminarayanan"

Now showing items 21-40 of 53

    • Excitable Patterns in Active Nematics 

      Giomi, Luca; Mahadevan, Lakshminarayanan; Chakraborty, Bulbul; Hagan, Michael (American Physical Society, 2011)
      We analyze a model of mutually propelled filaments suspended in a two-dimensional solvent. The system undergoes a mean-field isotropic-nematic transition for large enough filament concentrations, and the nematic order parameter ...

    • Feedback-Induced Phase Transitions in Active Heterogeneous Conductors 

      Ocko, Samuel A; Mahadevan, Lakshminarayanan (American Physical Society (APS), 2015)
      An active conducting medium is one where the resistance (conductance) of the medium is modified by the current (flow) and in turn modifies the flow, so that the classical linear laws relating current and resistance, e.g., ...

    • Flagellar dynamics of a connected chain of active, polar, Brownian particles 

      Chelakkot, R.; Gopinath, A.; Mahadevan, Lakshminarayanan; Hagan, Marianne L (The Royal Society, 2013)
      We show that active, self-propelled particles that are connected together to form a single chain that is anchored at one end can produce the graceful beating motions of flagella. Changing the boundary condition from a clamp ...

    • Fluid-driven fingering instability of a confined elastic meniscus 

      Biggins, John S.; Wei, Z; Mahadevan, Lakshminarayanan (IOP Publishing, 2015)
      When a fluid is pumped into a cavity in a confined elastic layer, at a critical pressure, destabilizing fingers of fluid invade the elastic solid along its meniscus (Saintyves B. et al., Phys. Rev. Lett., 111 (2013) 047801). ...

    • Gait and speed selection in slender inertial swimmers 

      Gazzola, Mattia; Argentina, Médéric; Mahadevan, Lakshminarayanan (Proceedings of the National Academy of Sciences, 2015)
      Inertial swimmers use flexural movements to push water and generate thrust. We quantify this dynamical process for a slender body in a fluid by accounting for passive elasticity and hydrodynamics and active muscular force ...

    • Grasping With a Soft Glove: Intrinsic Impedance Control in Pneumatic Actuators 

      Paoletti, P; Jones, G; Mahadevan, Lakshminarayanan (The Royal Society, 2017-03)
      The interaction of a robotic manipulator with unknown soft objects represents a significant challenge for traditional robotic platforms because of the difficulty in controlling the grasping force between a soft object and ...

    • Growth Patterns for Shape-Shifting Elastic Bilayers 

      van Rees, Wim; Vouga, Etienne; Mahadevan, Lakshminarayanan (Proceedings of the National Academy of Sciences, 2017-10-16)
      Inspired by the differential-growth-driven morphogenesis of leaves, flowers, and other tissues, there is increasing interest in artificial analogs of these shape-shifting thin sheets made of active materials that respond ...

    • How the Venus Flytrap Snaps 

      Forterre, Yoel; Skotheim, Jan M.; Dumais, Jacques; Mahadevan, Lakshminarayanan (Nature Publishing Group, 2005)
      The rapid closure of the Venus flytrap (Dionaea muscipula) leaf in about 100 ms is one of the fastest movements in the plant kingdom. This led Darwin to describe the plant as "one of the most wonderful in the world". The ...

    • Hydraulic Control of Mammalian Embryo Size and Cell Fate 

      Chan, Chii Jou; Costanzo, Maria; Ruiz-Herrero, Teresa; Mönke, Gregor; Petrie, Ryan; Petrie, Ryan; Bergert, Martin; Diz-Muñoz, Alba; Mahadevan, Lakshminarayanan; Hiiragi, Takashi (Springer Science and Business Media LLC, 2019-06-12)
      Size control is fundamental in tissue development and homeostasis1,2. While the role of cell proliferation in these processes has been widely studied, the mechanisms of embryo size control and how it impacts cell fates ...

    • Intermittent locomotion as an optimal control strategy 

      Paoletti, P.; Mahadevan, Lakshminarayanan (The Royal Society, 2014)
      Birds, fish and other animals routinely use unsteady effects to save energy by alternating between phases of active propulsion and passive coasting. Here, we construct a minimal model for such behaviour that can be couched ...

    • Morphogenesis One Century After on Growth and Form 

      Lecuit, Thomas; Mahadevan, Lakshminarayanan (The Company of Biologists, 2017-11-28)
      Morphogenesis, the study of how forms arise in biology, has attracted scientists for aeons. A century ago, D'Arcy Wentworth Thompson crystallized this question in his opus On Growth and Form (Thompson, 1917) using a series ...

    • On the Growth and Form of Shoots 

      Chelakkot Govindalayam, Raghunath; Mahadevan, Lakshminarayanan (The Royal Society, 2017-03-22)
      Growing plant stems and shoots exhibit a variety of shapes that embody growth in response to various stimuli. Building on experimental observations, we provide a quantitative biophysical theory for these shapes by accounting ...

    • Optimal control of plates using incompatible strains 

      Jones, G W; Mahadevan, Lakshminarayanan (IOP Publishing, 2015)
      A flat plate will bend into a curved shell if it experiences an inhomogeneous growth field or if constrained appropriately at a boundary. While the forward problem associated with this process is well studied, the inverse ...

    • Optimal vein density in artificial and real leaves 

      Noblin, X.; Mahadevan, Lakshminarayanan; Coomaraswamy, I. A.; Weitz, David A.; Holbrook, Noel Michele; Zwieniecki, Maciej A. (Proceedings of the National Academy of Sciences, 2008)
      The long evolution of vascular plants has resulted in a tremendous variety of natural networks responsible for the evaporatively driven transport of water. Nevertheless, little is known about the physical principles that ...

    • Organ Size Control via Hydraulically Gated Oscillations 

      Ruiz-Herrero, Teresa; Alessandri, Kévin; Gurchenkov, Basile; Nassoy, Pierre; Mahadevan, Lakshminarayanan (The Company of Biologists, 2017)
      Hollow vesicular tissues of various sizes and shapes arise in biological organs such as ears, guts, hearts, brains and even entire organisms. Regulating their size and shape is crucial for their function. Although chemical ...

    • The organization and control of an evolving interdependent population 

      Vural, Dervis C.; Isakov, Alexander; Mahadevan, Lakshminarayanan (The Royal Society, 2015)
      Starting with Darwin, biologists have asked how populations evolve from a low fitness state that is evolutionarily stable to a high fitness state that is not. Specifically of interest is the emergence of cooperation and ...

    • Painting with Drops, Jets, and Sheets 

      Herczynski, Andrzej; Cernuschi, Claude; Mahadevan, Lakshminarayanan (American Institute of Physics, 2011)
      A fluid dynamics analysis of Jackson Pollock’s technique opens his and other artists’ work to quantitative exploration.

    • Phototactic guidance of a tissue-engineered soft-robotic ray 

      Park, Sung-Jin; Gazzola, Mattia; Park, Kyung; Park, Shirley; Di Santo, Valentina; Blevins, Erin; Lind, Johan Ulrik; Campbell, Patrick Healy; Dauth, Stephanie; Capulli, Andrew Keith; Pasqualini, Francesco; Ahn, Seungkuk; Cho, Alexander; Yuan, Hongyan; Maoz, Ben Meir; Vijaykumar, Ragu; Choi, Jeong-Woo; Deisseroth, Karl; Lauder, George V.; Mahadevan, Lakshminarayanan; Parker, Kevin Kit (American Association for the Advancement of Science (AAAS), 2016)
      Inspired by the relatively simple morphological blueprint provided by batoid fish such as stingrays and skates, we create a biohybrid system that enables an artificial animal, a tissue-engineered ray, to swim and phototactically ...

    • Problems at the Nexus of Geometry and Soft Matter: Rings, Ribbons and Shells 

      Yong, Ee Hou (2012-08-17)
      There has been an increasing appreciation of the role in which elasticity plays in soft matter. The understanding of many shapes and conformations of complex systems during equilibrium or non-equilibrium processes, ranging ...

    • Programming Shape Using Kirigami Tessellations 

      Choi, Gary Pui-Tung; Dudte, Levi H.; Mahadevan, Lakshminarayanan (Springer Science and Business Media LLC, 2019-08-19)
      Kirigami tessellations are regular planar patterns formed by cutting flat, thin sheets that morph into structures with rich geometries and unusual material properties. However, geometric constraints make the development ...