Filters








3,857 Hits in 17.0 sec

On Emulation of Flueric Devices in Excitable Chemical Medium

Andrew Adamatzky, Irene Sendiña-Nadal
2016 PLoS ONE  
Fluidic devices use fluid as a medium for information transfer and computation.  ...  Implementation of analog of the flueric devices in the excitable chemical systems opens doors to further applications of excitation wave-based unconventional computing in soft robotics, embedded organic  ...  Yokoi H, Adamatzky A, de Lacy Costello B, Melhuish C. Excitable Chemical Medium Controller for a Robotic Hand: Closed-Loop Experiments.  ... 
doi:10.1371/journal.pone.0168267 pmid:27997561 pmcid:PMC5173363 fatcat:74hmyh2bsjad7kj4h6txdsaaxy

Electromagnetic Composites: from Effective Medium Theories to Metamaterials [article]

Faxiang Qin, Mengyue Peng, Diana Estevez, Christian Brosseau
2022 arXiv   pre-print
We show how this corpus allows a consistent construction of effective medium theories and allows for numerical simulation of EM composites to deal with structure-property relationships.  ...  We then discuss the influence of spatial dispersion of shaped inclusions in the material medium on the EM properties of composites, which has not been systematically illustrated in the context of this  ...  A two-component composite where the isolated ellipsoids with a permittivity 𝜀𝜀 i (inclusion volume fraction ∅ 2 ) are dispersed in a continuous medium of permittivity 𝜀𝜀 m is studied here to demonstrate  ... 
arXiv:2205.07078v1 fatcat:vepe54hv6zckdak44ocwz3f5qa

Current-driven homogenization and effective medium parameters for finite samples

Vadim A. Markel, Igor Tsukerman
2013 Physical Review B  
As a result, they cannot model reflection and transmission by finite samples with the desired accuracy and are not useful for design of metamaterial-based devices.  ...  We apply this theory to the case of one-dimensional periodic medium wherein both exact and homogenization results can be obtained analytically in closed form.  ...  The period of the system is given by h = a + b.  ... 
doi:10.1103/physrevb.88.125131 fatcat:7cnxefxur5ao5i4tpfv7poy6ey

In-Medium Effects in the Holographic Quark-Gluon Plasma

Felix Rust
2010 Advances in High Energy Physics  
They agree with previous publications in the according limits. (ii) We study the temperature and density dependence of transport properties of fundamental matter in the QGP.  ...  We use a setup in which we can describe the holographic plasma at finite temperature and either baryon or isospin density and investigate the properties of the system from three different viewpoints.  ...  Acknowledgments The author is deeply grateful to all the people he worked with during his time as a Ph.D.  ... 
doi:10.1155/2010/564624 fatcat:hyvbhnsa3nfz5lthbn6yqan4nm

Acoustic source identification in an enclosed space using the inverse phased beam tracing at medium frequencies

Jeong‐Guon Ih, Cheol‐Ho Jeong
2008 Journal of the Acoustical Society of America  
and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the  ...  public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL  ...  picosecond light pulses in a medium can generate sub-THz acoustic waves.  ... 
doi:10.1121/1.2933749 fatcat:xiro7xkminfl5o3psp2ejziawq

Optical localised structures and their dynamics

S Residori, T Nagaya, A Petrossian
2003 Europhysics letters  
-When bistability and diffraction are simultaneously present, a Liquid-Crystal-Light-Valve with optical feedback shows the appearance of localised structures.  ...  PACS. 42.65.Sf -Dynamics of nonlinear optical sytems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics. PACS. 47.54.+r -Pattern selection; pattern formation.  ...  -This work has been supported by the ACI of the French Ministry of Research (2218 CDR 2). We gratefully acknowledge A.C. Newell for helpful discussions.  ... 
doi:10.1209/epl/i2003-00558-3 fatcat:ukv62o4edrgvjh4e5ydvtkuzr4

Deep tissue optical focusing and optogenetic modulation with time-reversed ultrasonically encoded light

Haowen Ruan, Joshua Brake, J. Elliott Robinson, Yan Liu, Mooseok Jang, Cheng Xiao, Chunyi Zhou, Viviana Gradinaru, Changhuei Yang
2017 Science Advances  
a wavelength of 532 nm.  ...  However, the optical scattering of biological tissue prevents conventional optical systems from tightly focusing visible light beyond several hundred micrometers.  ...  The ability to manipulate scattered photons to create a light focus at depth with wavefront shaping is due to the elastic, deterministic nature of optical scattering, which scrambles but does not eliminate  ... 
doi:10.1126/sciadv.aao5520 pmid:29226248 pmcid:PMC5722648 fatcat:h3h6lge5ffcv3fgnkio3tzhmvu

Multisite two-photon imaging of neurons on multielectrode arrays

Steve M. Potter, Natalia Lukina, Kenneth J. Longmuir, Yan Wu, Ammasi Periasamy, Peter T. C. So
2001 Multiphoton Microscopy in the Biomedical Sciences  
We are using cultured networks of cortical neurons grown on microelectrode arrays as a model system for studying the emergent properties of ensembles of living neurons.  ...  We have developed a 2-way communication interface between the cultured network and a computer-generated animal, the Neurally Controlled Animat.  ...  We thank Eric Murphy, Alan Waring, Sherry Haynes, Phil Felgner and Mary Dickinson for development and testing ofthe liposome-based gene delivery system.  ... 
doi:10.1117/12.424542 fatcat:5kyruhopkzd6vemqfpnusfxhwe

Light sheet adaptive optics microscope for 3D live imaging

C. Bourgenot, J. M. Taylor, C. D. Saunter, J. M. Girkin, G. D. Love, Carol J. Cogswell, Thomas G. Brown, Jose-Angel Conchello, Tony Wilson
2013 Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XX  
Indeed with the advent of genetic manipulation and specifically, the use of fluorescent protein expressing in animals and plants it has actually seen a renaissance in the past ten years, in particular  ...  A first implementation of AO on the emission path of a light sheet microscope is also presented. Declaration The work in this thesis is based on research carried out at  ...  In a closed loop AO system, backscattered light from the sample can be used as an artificial guide star.  ... 
doi:10.1117/12.2002057 fatcat:zao646tyczf4tp4f4pwnvs6s6i

Comprehensive Review Tapered Optical Fiber Configurations for Sensing Application: Trend and Challenges

Bakr Ahmed Taha, Norazida Ali, Nurfarhana Mohamad Sapiee, Mahmoud Muhanad Fadhel, Ros Maria Mat Yeh, Nur Nadia Bachok, Yousif Al Mashhadany, Norhana Arsad
2021 Biosensors  
The analysis of performance for tapered optical fibers depends on four mean parameters: taper length, sensitivity, wavelength scale, and waist diameter.  ...  crystals fiber (PCF), surface plasmonic resonance (SPR), multi-taper devices, fiber loop ring-down technology, and optical tweezers.  ...  Acknowledgments: The authors gratefully acknowledge the financial support of the Department of Electrical, Electronic and Systems Engineering/Faculty of Engineering and Built Environment/Universiti Kebangsaan  ... 
doi:10.3390/bios11080253 pmid:34436055 pmcid:PMC8391612 fatcat:6i2krrzbcffgznjnp7lp55qiaa

Novel Optics-Based Approaches for Cardiac Electrophysiology: A Review

M. Caroline Müllenbroich, Allen Kelly, Corey Acker, Gil Bub, Tobias Bruegmann, Anna Di Bona, Emilia Entcheva, Cecilia Ferrantini, Peter Kohl, Stephan E. Lehnart, Marco Mongillo, Camilla Parmeggiani (+5 others)
2021 Frontiers in Physiology  
Approaches which combine optogenetic manipulation and optical voltage measurement are discussed, in terms of platforms that allow real-time manipulation of whole heart electrophysiology in open and closed-loop  ...  systems to study optimal ways to terminate spiral arrhythmias.  ...  Real-Time Manipulation of Cardiac Electrical Activity in a Closed-Loop System All-optical cardiac electrophysiology is a powerful contactless interrogation and manipulation technique (Entcheva and Bub  ... 
doi:10.3389/fphys.2021.769586 pmid:34867476 pmcid:PMC8637189 fatcat:v72js6yjobetvbg7jdrjtza6y4

Meta-optics for spatial optical analog computing

Sajjad Abdollahramezani, Omid Hemmatyar, Ali Adibi
2020 Nanophotonics  
Moreover, numerical investigations and experimental demonstrations of computational optical surfaces and metastructures for solving a diverse set of mathematical problems (e.g., integrodifferentiation  ...  In this review, we discuss state-of-the-art developments, as well as emerging trends, in computational metastructures as disruptive platforms for spatial optical analog computation.  ...  (B) Left panel: time snapshot of the simulated out-of-plane component of the electric field distribution in the closed-loop network when excited at port 1, with the other four ports unexcited.  ... 
doi:10.1515/nanoph-2020-0285 fatcat:pt5urzmrlfhkfnx7tltq4d24y4

Optogenetics enables real-time spatiotemporal control over spiral wave dynamics in an excitable cardiac system

Rupamanjari Majumder, Iolanda Feola, Alexander S Teplenin, Antoine AF de Vries, Alexander V Panfilov, Daniel A Pijnappels
2018 eLife  
Theoretically, manipulation of a spiral wave core should lead to full spatiotemporal control over its dynamics.  ...  Propagation of non-linear waves is key to the functioning of diverse biological systems.  ...  IF would like to thank Cindy Bart and Annemarie Kip for their assistance with the animal experiments and lentiviral particles production.  ... 
doi:10.7554/elife.41076 fatcat:rrz2dj3z5ngybgdwtrauo2mbhi

Nonlinear plasmonic antennas

Shakeeb Bin Hasan, Falk Lederer, Carsten Rockstuhl
2014 Materials Today  
A pair of meta-surfaces formed by center-fed half-wavelength antennas for 'perfect' imaging. (a) Schematic of a single center-fed antenna array with signal and pump illuminations.  ...  Thus, these antennas exhibit a promising potential to achieve optical frequency conversion and all-optical control of light at the nano-scale.  ...  Acknowledgements Support from the German Federal Ministry of Education and Research (PhoNa), the Thuringian State Government (MeMa), and the German Science Foundation (SPP 1391 Ultrafast Nano-optics) is  ... 
doi:10.1016/j.mattod.2014.05.009 fatcat:jzuqtwbfnfavphxi4hejioq32q

Physarum Boats: If Plasmodium Sailed It Would Never Leave a Port

Andrew Adamatzky
2010 Applied Bionics and Biomechanics  
In experimental laboratory conditions and computational experiments we study phenomenology of the plasmodium-floater system, and possible mechanisms of controlling motion of objects propelled by on-board  ...  It is capable of approximation of the shortest path in a maze, computation of planar proximity graphs and plane tessellations, primitive memory and decision making.  ...  We mimicked this phenomenon in cellular automaton models of mobile light-sensitive lattices.  ... 
doi:10.1155/2010/278302 fatcat:z2oirbvxcban7d34kn45t7ycxe
« Previous Showing results 1 — 15 out of 3,857 results