scholarly journals Evaluation of Electrovibration Stimulation with a Narrow Electrode

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 483 ◽  
Author(s):  
Hiroki Ishizuka ◽  
Seiya Komurasaki ◽  
Kunihiro Kato ◽  
Hiroyuki Kajimoto
Keyword(s):  
High Resolution ◽  
Use Cases ◽  
Tactile Sensation ◽  
Voltage Waveform ◽  
Low Frequencies ◽  
Tactile Displays

Recently, electrovibration tactile displays were studied and applied to several use cases by researchers. The high-resolution electrode for electrovibration stimulus will contribute to the presentation of a more realistic tactile sensation. However, the sizes of the electrodes that have been used thus far are of the millimeter-order. In this study, we evaluated whether a single narrow electrode was able to provide the electrovibration stimulus adequately. The widths of the prepared electrodes were 10, 20, 50, 100, 200, and 500 μm. We conducted a sensory experiment to characterize each electrode. The electrodes with widths of 50 μm or less were not durable or suitable for the applied signal, although the subjects perceived the stimulus. Therefore, we conducted the experiment without using these non-durable electrodes. The voltage waveform condition affected perception, and the subjects were not sensitive to the electrovibration stimulus at low frequencies. In addition, the stroke direction of the fingertip had a significant effect on perception under certain conditions. The results indicate that electrovibration stimulation requires an electrode with a width of only a few hundred micrometers for stimulation.

Tactile Display for a Surface Texture Sensation

1997 ◽  
Author(s):  
Yasushi Ikei ◽  
Shuichi Fukuda
Keyword(s):  
Surface Texture ◽  
Research Work ◽  
Tactile Display ◽  
Just Noticeable Difference ◽  
Intensity Change ◽  
Future Research ◽  
Texture Element ◽  
Low Frequencies ◽  
Tactile Displays ◽  
Real Objects

Abstract The authors have developed tactile displays which have vibrating pins to convey the surface texture sensation of object surfaces to the user’s fingertip. The tactile sensation intensity scaling was performed to obtain a sensation scale of the display by means of the JND (just noticeable difference) method. One dimensional curves on the scale were displayed to investigate the human sensitivity to an intensity change rate. A tactile texture presentation method based on the image of an object surface is introduced. Two kinds of experiment were performed to discuss the feature of the method. Texture discrimination is the first one, in which the effect of texture element size to the correct separation was discussed. Then the sensations produced by the display and those by real objects were compared regarding several samples that had a major feature of vertical lines and of not containing low frequencies. The results are summarized, which is followed by the future research work.

scholarly journals Low Frequency Radio Astronomy from Above the Ionosphere

2002 ◽  
Vol 199 ◽  
pp. 488-489
Author(s):  
D. L. Jones
Keyword(s):  
High Resolution ◽  
Radio Astronomy ◽  
Coronal Mass Ejections ◽  
Solar Radio ◽  
Low Frequency ◽  
Dramatic Improvement ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Low Frequencies ◽  
High Resolution Images

The GMRT represents a dramatic improvement in ground-based observing capabilities for low frequency radio astronomy. At sufficiently low frequencies, however, no ground-based facility will be able to produce high resolution images while looking through the ionosphere. A space-based array will be needed to explore the objects and processes which dominate the sky at the lowest radio frequencies. An imaging radio interferometer based on a large number of small, inexpensive satellites would be able to track solar radio bursts associated with coronal mass ejections out to the distance of Earth, determine the frequency and duration of early epochs of nonthermal activity in galaxies, and provide unique information about the interstellar medium.

A High-Resolution Planar Hall Effect Magnetometer for Ultra-Low Frequencies

2016 ◽  
Vol 16 (9) ◽  
pp. 3224-3230 ◽  
Author(s):  
Asaf Grosz ◽  
Vladislav Mor ◽  
Shai Amrusi ◽  
Igor Faivinov ◽  
Eugene Paperno ◽  
...  
Keyword(s):  
High Resolution ◽  
Hall Effect ◽  
Low Frequencies ◽  
Planar Hall Effect

Scalable, MEMS-enabled, vibrational tactile actuators for high resolution tactile displays

2014 ◽  
Vol 24 (12) ◽  
pp. 125014 ◽  
Author(s):  
Xin Xie ◽  
Yuri Zaitsev ◽  
Luis Fernando Velásquez-García ◽  
Seth J Teller ◽  
Carol Livermore
Keyword(s):  
High Resolution ◽  
Tactile Displays

scholarly journals Development of MEMS Tactile Sensation Device for Haptic Robot

2020 ◽  
Vol 32 (2) ◽  
pp. 315-322 ◽  
Author(s):  
Junji Sone ◽  
Yasuyoshi Matsumoto ◽  
Yoji Yasuda ◽  
Shoichi Hasegawa ◽  
Katsumi Yamada ◽  
...  
Keyword(s):  
High Resolution ◽  
3D Printing ◽  
Electromechanical System ◽  
Tactile Sensation ◽  
Repulsion Force ◽  
Mems Technology ◽  
High Resolution Images ◽  
Prototype Device ◽  
Micro Electromechanical System ◽  
Haptic Sensation

A tactile sensation device using micro-electromechanical system (MEMS) has been developed. This device is integrated with a haptic sensation robot for use as fingers. The tactile device must be miniaturized to enable attachment of the actuator mechanism to the fingers. Therefore, we used MEMS technology for this device. The device is composed of an interface part fabricated by 3D printing, pins, and MEMS cantilever-type actuators. It has the ability to stimulate the mechanoreceptors of the fingertips. The device and robot can display not only high-resolution images of the fingertips but also the repulsion force during finger operations such as tool holding and rotation. We have not yet achieved the final device because of fabrication problems. In this paper, we explain the details, progress of development, and results of trials on the prototype device.

The evolution of FWI and its perceived benefits

2019 ◽  
Vol 59 (1) ◽  
pp. 432
Author(s):  
Tony Martin ◽  
Andrew Long
Keyword(s):  
High Resolution ◽  
Seismic Imaging ◽  
Waveform Inversion ◽  
Low Frequencies ◽  
Near Surface ◽  
Surface Features ◽  
Case Examples ◽  
Velocity Models ◽  
Attribute Analysis ◽  
Seismic Volumes

Despite the mathematics behind full waveform inversion (FWI) being published in the early 1980s, it was 30 years before the method could be efficiently implemented on the scale of conventional 3D marine seismic volumes. FWI has evolved from using only transmitted waves and being constrained because towed streamer data lacked the very long offsets and ultra-low frequencies necessary to derive stable velocity updates beyond shallow depths. FWI now uses the full seismic wavefield (both transmitted and scattered wavefields), recovers deep velocity updates for standard offsets and frequencies and increasingly uses a wider range of frequencies that contribute to seismic imaging. We use several case examples to consider the benefits and caveats for robust FWI application: for resolving near-surface features and reducing seismic imaging uncertainty in areas with complex overburden heterogeneities; for resolving near-surface features and improving volumetric estimates; for using an enlarged bandwidth to resolve small model features; for updating the velocity in high contrast regimes; and for the creation of survey-wide, high-resolution models to reduce imaging uncertainty, complement attribute analysis, estimate elastic properties and prospect derisking. Collectively, we demonstrate how to produce high-resolution velocity models when conventional methods cannot and how to generate earth models in an accelerated fashion to reduce project turnaround. We describe pragmatic limits to what maximum FWI frequencies are reasonable and suggest ways that may soon by-pass signal processing and obtain direct earth attributes.

scholarly journals High-resolution acoustic imaging at low frequencies using 3D-printed metamaterials

AIP Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 121701 ◽  
Author(s):  
S. Laureti ◽  
D. A. Hutchins ◽  
L. A. J. Davis ◽  
S. J. Leigh ◽  
M. Ricci
Keyword(s):  
High Resolution ◽  
Acoustic Imaging ◽  
Low Frequencies ◽  
3D Printed

scholarly journals Self-powered electro-tactile system for virtual tactile experiences

2021 ◽  
Vol 7 (6) ◽  
pp. eabe2943
Author(s):  
Yuxiang Shi ◽  
Fan Wang ◽  
Jingwen Tian ◽  
Shuyao Li ◽  
Engang Fu ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Augmented Reality ◽  
Electrostatic Discharge ◽  
Electrode Array ◽  
Tactile Sensation ◽  
Triboelectric Nanogenerator ◽  
Tactile Displays ◽  
Highly Sensitive ◽  
Self Powered ◽  
Tactile System

Tactile sensation plays important roles in virtual reality and augmented reality systems. Here, a self-powered, painless, and highly sensitive electro-tactile (ET) system for achieving virtual tactile experiences is proposed on the basis of triboelectric nanogenerator (TENG) and ET interface formed of ball-shaped electrode array. Electrostatic discharge triggered by TENG can induce notable ET stimulation, while controlled distance between the ET electrodes and human skin can regulate the induced discharge current. The ion bombardment technique has been used to enhance the electrification capability of triboelectric polymer. Accordingly, TENG with a contact area of 4 cm2 is capable of triggering discharge, leading to a compact system. In this skin-integrated ET interface, touching position and motion trace on the TENG surface can be precisely reproduced on skin. This TENG-based ET system can work for many fields, including virtual tactile displays, Braille instruction, intelligent protective suits, or even nerve stimulation.

Copernicus Sectoral Information System for the Biodiversity Sector

2020 ◽  
Author(s):  
Koen De Ridder ◽  
Filip Lefebre ◽  
Eline Vanuytrecht ◽  
Julie Berckmans ◽  
Hendrik Wouters
Keyword(s):  
Climate Change ◽  
Information System ◽  
High Resolution ◽  
Global Climate ◽  
Future Climate ◽  
Use Cases ◽  
Climate Projections ◽  
Climate Data ◽  
Climate Conditions ◽  
Climate Suitability

<p>Biodiversity is increasingly under pressure from climate change, which affects the habitat suitability for species as well as the efficiency of ecosystem services. Management of these issues, for instance through ecosystem restoration or species dispersal measures, is often hindered by a lack of appropriate information about (future) climate conditions.  To address this, an operational Sectoral Information System (SIS) for the Biodiversity sector (SIS Biodiversity) is designed within the Copernicus programme Climate Change Service (C3S). This new SIS provides tailored bio-climatic indicators and applications, and delivers novel evidence regarding impacts of past, present and future climate. As such, it provides support to decision making challenges that are currently facing unmet climate data needs.<br> <br>The new climate service for SIS Biodiversity will be demonstrated, including the outline, workflow and outcomes of the use cases. The service is built upon the Copernicus Data Store platform (CDS; ), and takes into account (1) the barriers in ongoing bio-climate assessments and (2) the user requirements of diverse stakeholders (e.g. researcher institutes, local NGO’s, the International Union for Conservation of Nature and Natural Resources (IUCN),…). These have been collected during workshops and bilateral meetings in 2019. A common barrier is the lack of reliable and high-resolution information about states and dynamics of the soil, sea, ice and air for the past and the future climate. Therefore, the service provides relevant bio-climatic indicators on the basis of a wealth of available variables from the latest ERA5 reanalysis datasets and the CMIP5 global climate projections available in CDS. In order to provide information at high resolution and minimize inconsistencies between observed and modelled variables, different downscaling and bias-correction techniques are applied. A common requirement is a universal and flexible interface to the bio-climatic indicators in an easy-to-use and coherent platform that is applicable for different fauna and flora species of interest. Therefore, different applications have been developed within CDS for generating bio-climate suitability envelopes from the high-resolution indicators and to evaluate climate suitability and impacts for the species under present and future climate. Finally, the service is currently tested and refined on the basis of specific use cases. Special attention is given to their transferability to other global and topical studies, hence maximizing external user uptake throughout existing research and policy networks.</p>

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