A5101967966- Photonic Crystals and Applications
- Blind Source Separation Techniques
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- EEG and Brain-Computer Interfaces
- Advanced Materials and Mechanics
- Thermal Radiation and Cooling Technologies
- Nanofabrication and Lithography Techniques
- Biocrusts and Microbial Ecology
- Neurobiology and Insect Physiology Research
- Diatoms and Algae Research
- Tensor decomposition and applications
- Polydiacetylene-based materials and applications
- ECG Monitoring and Analysis
- Liquid Crystal Research Advancements
- Optical Coatings and Gratings
- Radiative Heat Transfer Studies
- Machine Learning in Materials Science
- Neural dynamics and brain function
- Dielectric materials and actuators
- Supercapacitor Materials and Fabrication
- Ophthalmology and Visual Impairment Studies
- Animal Behavior and Reproduction
- Urban Heat Island Mitigation
- Conducting polymers and applications
RIKEN Center for Advanced Intelligence Project
2023-2024
Shanghai Jiao Tong University
2008-2024
Shandong Eye Hospital
2022
University of Cambridge
2012-2016
RIKEN Center for Brain Science
2012
This paper presents a new approach to the feature extraction for reliable heart rhythm recognition. system of classffication is comprised three components including data preprocessing, and classification ECG signals. Two different methods are applied together obtain vector data. The wavelet transform used extract coefficients as features each segment. Simultaneously, autoregressive modelling(AR) also temporal structures waveforms. Then support machine(SVM) with Gaussian kernel classify...
Abstract Despite the availability of elaborate varieties nanoparticles, their assembly into regular superstructures and photonic materials remains challenging. Here we show how flexible films stacked polymer nanoparticles can be directly assembled in a roll-to-roll process using bending-induced oscillatory shear technique. For sub-micron spherical this gives elastomeric crystals termed opals showing extremely strong tunable structural colour. With strain amplitudes 300%, crystallization...
A new generalized multilinear regression model, termed the Higher-Order Partial Least Squares (HOPLS), is introduced with aim to predict a tensor (multiway array) $\tensor{Y}$ from $\tensor{X}$ through projecting data onto latent space and performing on corresponding variables. HOPLS differs substantially other models in that it explains by sum of orthogonal Tucker tensors, while number loadings serves as parameter control model complexity prevent overfitting. The low dimensional optimized...
Photonic structural materials have received intensive interest and been strongly developed over the past few years for image displays, sensing, anticounterfeit materials. Their "smartness" arises from their color responsivity to changes of environment, strain, or external fields. Here, we introduce a novel invisible photonic system that reveals encrypted images characters by simply stretching, immersing in solvents. This type intriguing material is composed regularly arranged core–shell...
Abstract Stretching elastic materials containing nanoparticle lattices is common in research and industrial settings, yet our knowledge of the deformation process remains limited. Understanding how such reconfigure critically important, as changes microstructure lead to significant alterations their performance. This understanding has been extremely difficult achieve due a lack fundamental rules governing rearrangements. Our study elucidates physical processes underlying mechanisms...
Abstract The construction of high‐performance electrodes with sufficient active sites and interconnected networks for rapid electron/ions transport is challengeable energy storage devices. Inspired by natural leaves, a facile 3D‐printing strategy constructing architected Ni 0.33 Co 0.66 S 2 /graphene (3DP‐NCS/G) aerogels to mimic the analogous mass transfer process toward superior electrochemical performances demonstrated. key step develop hybrid inks printability homogeneity introducing...
Automatic recognition of cardiac arrhythmias is important for diagnosis abnormalities. This paper presents a new approach to classification ECG signals based on feature extraction diagnose heartbeat irregularities. We introduce the independent component analysis (ICA) method and propose an over-complete combining ICA basis function's coefficients wavelet transform coefficients. A set relevant features are selected from entire overcomplete using selection method. The used trained support...
We report the investigation of a nano-scale antireflection structure in black scales Troides aeacus butterfly wing, which can be viewed as natural solar collector. The intelligence light capturing hides itself intricate architectures aside from melanin effect. Reflection and transmission spectra were obtained experimentally well with 3D FDTD (three dimensional finite difference time domain) method. Poynting vector maps show energy distribution reflection micro geometric portrayed well....
Abstract Structural whiteness in nature is one of the useful optical phenomena contributed by refined microstructures and serves important biological functions. However, residing wings, antennae, bodies butterflies often draws less attention, with undetected physical mechanisms applications. Here, it discovered that bright silver scales on ventral side butterfly Curetis acuta Moore have enhanced broadband reflection particular angle dependency, which dominated irregularity scales. The result...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Qibin Zhao, Andrew Haines, David Snoswell, Christoph Keplinger, Rainer Kaltseis, Siegfried Bauer, Ingrid Graz, Richard Denk, Peter Spahn, Goetz Hellmann, Jeremy J. Baumberg; Electric-field-tuned color in photonic crystal elastomers. Appl. Phys. Lett. 5 March 2012; 100 (10): 101902....
Ordered binary and ternary photonic crystals, composed of different sized polymer-composite spheres with diameter ratios up to 120%, are generated using bending-induced oscillatory shearing. This viscoelastic system creates polydisperse equilibrium structures, producing mixed opaline colored films greatly reduced requirements for particle monodispersity, very sphere size compared other methods nanoassembly. As a service our authors readers, this journal provides supporting information...
Abstract Radiative cooling films (RCFs) are crucial for spacecraft thermal management, but their optical performance is currently limited by structures and intrinsic high absorption at short wavelengths. In this study, a novel RCF using electrospun polyimide nanofibers optimized both the molecular microscale levels developed. The newly designed molecules significantly decrease visible ultraviolet (UV) light while maintaining excellent radiation properties in infrared spectrum. By optimizing...
Large-scale structural color flexible coatings have been hard to create, and patterning on them is key many applications, including large-area strain sensors, wall-size displays, security devices, smart fabrics. To achieve controlled tuning, a micro-imprinting technique applied here pattern both the surface morphology of polymer opal films (POFs). These POFs are made 3D ordered arrays spherical particles embedded inside soft shells. The outer shells cause deform upon imprinting with...
Abstract Metasurface based phase manipulation has shown great capable of controlling anomalous reflection for low observability against laser active detection. However, current meta‐based designs stealth in near‐infrared (NIR) range suffer from small scattering angles and complex fabrication process, this hinders their mass productivity flexible application actual environments. Here, a bioinspired strategy is proposed to design meta‐reflection‐splitter with large angle strongly extinct...
Despite the elaborate varieties of iridescent colors in biological species, most them are reflective. Here we show rainbow-like structural found ghost catfish (Kryptopterus vitreolus), which exist only transmission. The fish shows flickering iridescence throughout transparent body. originates from collective diffraction light after passing through periodic band structures sarcomeres inside tightly stacked myofibril sheets, and muscle fibers thus work as transmission gratings. length varies...
Electrically conductive polymeric 3D photonic crystals are prepared by the shear ordering of composites consisting monodisperse core-shell polymer spheres and single-walled carbon nanotubes (SWNTs). Strong iridescent colour indicates that highly ordered opaline structures not disrupted presence nanotube networks. Thermal annealing leads to a significant increase in overall electrical conductivity thin-film samples yielding DC conductivities 10−4 S cm−1, with percolation thresholds less than...
This paper is concerned with the rheology and processing of solvent-free core shell “polymer opals” that consist a soft outer grafted to hard colloidal polymer particles. Strong iridescent colors can be produced by shearing material in certain way causes initially disordered spheres rearrange into ordered crystalline structures produce diffraction interference multiple light scattering, similar gemstone opals. The basic linear viscoelastic opal sample was determined as function temperature,...
A three-dimensional goniometric study of thin-film polymer photonic crystals investigates how the chromaticity structural color is correlated to ordering. Characterization and angular properties are presented in terms CIE 1931 spaces. We examine viewing angle dependency Bragg scattering cone relative sample symmetry planes, our results demonstrate increased ordering influences width anisotropy. Understanding can be quantified manipulated has significant implications for manufacture...
We present a study of the dynamic shear ordering viscoelastic photonic crystals, based on core-shell polymeric composite particles. Using an adapted shear-cell arrangement, crystalline material under conditions oscillatory is interrogated in real time, through both video imaging and from optical transmission spectra cell. In order to gain deeper understanding macroscopic influences crystallization process this solvent-free system, development bulk studied as function key parameters including...
Abstract Mechanoresponsive photonic crystals (MPCs) exhibit tunable optical properties and hold great promise for a wide range of applications. However, fabricating them in bulk form remains significant challenge. In this study, novel approach is presented producing MPCs with enhanced properties. By incorporating shear‐ordering into the 3D molding process, study successfully fabricates that display bright, saturated structural colors 80% reflectance. The are constructed layer‐by‐layer via...