175 zoekresultaten voor “acoustic metamaterials” in de Publieke website
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Strategies for Mechanical Metamaterial Design
On a structural level, the properties featured by a majority of mechanical metamaterials can be ascribed to the finite number of soft internal degrees-of freedom allowing for low-energy deformations.
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Martin van Hecke Lab (Mechanical Metamaterials)
We investigate the physics and design of mechanical metamaterial, intricately sculpted materials with properties set by their architecture.
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Origami metamaterials : design, symmetries, and combinatorics
In the first part of this thesis we study the geometry of folding patterns.
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Mechanical metamaterials: nonlinear beams and excess zero modes
Mechanical metamaterials are man-made materials which derive their unusual properties from their structure rather than their composition.
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Geometric phases in soft materials
Geometric phases lead to a nontrivial interference result when an electron's different quantum mechanical paths choices encircle a magnetic coil in an Aharonov-Bohm experiment.
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Metamaterial undermines 250-year-old construction principles
Researchers from FOM Institute AMOLF, Leiden University and Harvard University made a rubber beam that bends faster when subjected to less pressure. They published their work on 21 July online in Physical Review Letters.
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'Bigger is different' - the unusual physics of mechanical metamaterials
Mechanical metamaterials have been found to display surprising features, on top of their unusual properties such as shape morphing and programmability. When the materials are a step in size larger, new rules seem to apply. This was discovered by researchers at AMOLF and the universities of Leiden and…
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Self-folding metamaterial
The more complex the object, the harder it is to fold up. Space satellites often need many small motors to fold up an instrument, and people have difficulty simply folding up a roadmap. Physicists from Leiden and Amsterdam have now designed a structure that folds itself up in several steps. Publication…
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Urban ecology and avian acoustics: Function and evolution of birdsong in a changing world
Birds sing to be heard, but how do they cope with increasing noise levels? Which species persist in cities and why? And do they thrive or suffer in the urban soundscape?
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Tone and intonation processing: From ambiguous acoustic signal to linguistic representation
On November 1st, Min Liu succesfully defended her doctoral thesis and graduated. The Leiden University Centre for Linguistics congratulates Min on this great result.
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APELAFICO: Acoustic ecology of PELAgic FIsh COmmunities: A study into the effects of construction and operation of wind farms
Do offshore windfarms affect the local biodiversity of the pelagic fish community and are fish deterred or attracted by sounds?
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Topological Metamaterials in the media
Press coverage for the Nature Physics-paper about topological materials by Anne Meeussen, Erdal Oğuz, Yair Shokef and Martin van Hecke
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Buckling on demand
Researchers from Leiden University, the Netherlands, designed a novel metamaterial that buckles on demand. Small structural variations in the material single out regions that buckle selectively under external stress, whereas other regions remain unchanged. The research is published in this week’s Early…
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Physicists find way to control fractures
Rigid materials break more easily than floppy ones. This simple observation allows to predict and control the width of cracks. Theoretical understanding of how materials break is useful in for example the production of cars or screens. Publication in PNAS.
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Gabriel Paiuk on The Construction of an Imaginary Acoustic Space
On 23 March a Sonology concert took place in the Arnold Schönbergzaal at the Royal Conservatoire, dedicated to Gabriel Paiuk’s The Construction of an Imaginary Acoustic Space, a composition for ensemble and electronics performed by New European Ensemble.
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Aria of the Dutch North Sea
Promotores: C. J. ten Cate; M. A. Ainslie. Co-promotor: W. Slabbekoorn
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Premiere of The Construction of an Imaginary Acoustic Space
The Construction of an Imaginary Acoustic Space, a new work by ACPA PhD Candidate Gabriel Paiuk was premiered last Saturday at the Universität Mozarteum in Salzburg. The piece was commissioned by the österreichisches ensemble für neue musik for their second yearly concert series.
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Carel ten Cate
Wiskunde en Natuurwetenschappen
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Imperfections: using defects to program designer matter
Errors are everywhere, and mechanical failures are especially common: buckled grain silos and cracked support columns are, justly, seen as an issue to be avoided.
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Biological and Soft Matter Physics
Research groups in the Biological & Soft Matter Programme unravel mechanisms in biological processes and develop novel bio-inspired soft materials.
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Errol Neo
Wiskunde en Natuurwetenschappen
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Stable single molecules for quantum optics and all-optical switches
Promotor: Prof.dr. M.A.G.J. Orrit
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Strategies for Mechanical Metamaterial Design
Promotie
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Material built from gears
A specifically designed collection of gears is soft on one end and rigid on the other. These are robust properties of the system that hold even in the presence of manufacturing imperfections. This emerging research area may lead to new ways of designing geared devices like satellite trackers or watches.…
- Soft Condensed Matter
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Origami Metamaterials: Design, Symmetries, and Combinatorics
Promotie
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One-way traffic for motion in new material
Scientists have developed a material that breaks one of the fundamental principles governing many physical systems. Ordinary materials transmit external forces equally, no matter where the pressure comes from. The newly developed material breaks this rule and could potentially be of interest in soft-robotics…
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Sound of Mind: electrophysiological and behavioural evidence for the role of context, variation and informativity in human speech processing
In this dissertation, electrophysiological (EEG) and behavioural measures are used to investigate how allophonic tonal variants and sub-phonemic features are processed during Mandarin and Dutch speech production, visual processing of written words and reading aloud.
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Swimming Bass under Pounding Bass: fish response to sound exposure
Promotor: C.J. ten Cate, Co-promotor: H.W. Slabbekoorn
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Photothermal studies of single molecules and gold nanoparticles: vapor nanobubbles and conjugated polymers
Promotor: M.A.G.J. Orrit
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Tone sandhi, prosodic phrasing, and focus marking in Wenzhou Chinese
This thesis investigates the connection between tonal realization and tone change (tone sandhi) in Wenzhou Chinese, and whether and how such a connection is conditioned by prosodic structure and focus marking.
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Speech intelligibility problems of Sudanese learners of English. An experimental approach
This dissertation aims at discussing the nature and the linguistic factors assumed responsible for speech intelligibility problems of Sudanese learners of English.
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The development of the speech production mechanism in young children: evidence from the acquisition of onset clusters in Dutch
On October 31st, Margarita Gulian succesfully defended her doctoral thesis and graduated. The Leiden University Centre for Linguistics congratulates Margarita on this great result.
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A PCAD-model for fish to study the impact of airgun sound exposure on free-ranging cod
We are developing the conceptual framework, which is new to this taxonomic group, and evaluate the current state of the art with respect to all critical parameters and transfer functions for a fully developed Population Consequences of Acoustic Disturbance (PCAD) model.
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Infrastructure
An overview of our infrastructure at the SPP division:
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Biological, Soft and Complex Systems
We study the physics of a broad range of biological and soft materials
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Picturing Silence: interpreting the musical experience of silence through visual representation
If, as the works of John Cage suggest, there is “no such thing as silence,” then what are the markers that show us we are experiencing silence? - what are the performative cues during musical silence? - what are the auditory and visual bookends of silence in performance, i.e. what anticipates and…
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SATURN: Developing Solutions for Underwater Radiated Noise – Sound impact on migratory fishes
Do natural soundscapes affect migratory decisions of fishes moving up and down rivers and is this process disturbed by vessel sounds?
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DEEPSEA SOUND: pioneer explorations into biological relevance and anthropogenic disturbance
Are there acoustic cues for settlement stage larvae in deep-sea soundscapes around hydrothermal vents?
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IN THE BEGINNING WAS THE SOUND
How can we understand the drum-set – and thus drummer – as technological? How have technological developments affected change in drum-set performance and drum-set construction? Are the relationships between new technologies and the drummer symbiotic, or one way? To what extent are instruments and (reactive)…
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How animals flirt with each other
How do animals choose their partners? The answer is simple: it’s all about quality. While humans tend to wear clothes that happen to be in fashion, animals do nothing without a reason. Behind beautiful plumage or a deafening roar is only one message: I am in great shape. The evolutionary courtship displays…
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Tone and intonation processing: From ambiguous acoustic signal to linguistic representation
Promotie
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Topology and Geometry in Chiral Liquids
We study the interplay of topology and geometry with chirality for several passive and active systems, employing both analytical and numerical methods.
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Development & Disease in Animal Sciences
Animal Sciences’ contributions to the Development & Disease research theme include the mechanisms and evolution of embryonic development, the development of cognitive mechanisms, and animal models for understanding mechanisms of human disease.
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Prosody in whispered speech: retrieving alternative cues to pitch
The goal of this study is to systematically investigate how intonation (speech melody) is conveyed in whispered speech.
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The noisy underwater world: the effect of sound on behaviour of captive zebrafish
Promotor: Carel J. ten Cate, Co-Promotor: Hans W. Slabbekoorn
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Experimental Linguistics
How do we process language and speech? How do we integrate information at different levels – intonation, sentence structure, meaning, tone, words, sounds - and how does information at one level interact with information at another level?
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Crossing boundaries in improvised music
Developing new methods for performing improvised music
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ARCHITECTURES OF SPEED - reinventing the tools, functions and potentials of speed within rhythmical frames in music
What are the precise identities, possibilities and current practice examples of the various time frames in music and what bearings do they have individually and in combinations on the speed of the music?
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Stop! Hey, what's that sound? the representation and realization of Danish stops
On the 11th of January, Rasmus Puggaard-Rode successfully defended a doctoral thesis. The Leiden University Centre for Linguistics congratulates Rasmus on this achievement!