23,191 research outputs found
Effect of tocopherol on platelet aggregation in non-insulin-dependent diabetes mellitus: ex vivo and in vitro studies
No full textThe politics and economics of regulatory impact assessment
Get PDFThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
Phase Distribution Efficiency of cm-Scale Ultrasonically Powered Receivers
No full textIn the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of lateral and angular misalignment on the acoustic field phase distribution across the RX surface. We show that, for a single-element RX transducer, lateral misalignment has minimal effect on the harvestable power, whereas even small angular misalignments can cause a considerable reduction, especially for larger RX sizes. We present a potential solution that consists of subdividing a large RX transducer (e.g. 20 × 20mm2) into smaller elements, which significantly improves power transfer efficiency by taking advantage of the smaller phase variation across the surface of each element. The trade-offs between achieving a minimum acceptable power transfer efficiency and managing the increased complexity in packaging and matching circuitry are also discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsBio-Electronic
Paikannus piha-alueella kahta tai useampaa kameraa käyttäen
No full textTässä tutkielmassa tarkastellaan web-kameroiden avulla toteutettavaa
kohteen tunnistamista ja paikantamista. Työssä esitetään laskentakaavat ja menetel-
mä, joita tarvitaan sijainnin määrittämiseen kahta tai useampaa kameraa käyttäen
toteutettavassa paikantamisessa. Tuloksena havaitaan, että on mahdollista toteuttaa
riittävään, noin 10 cm tarkkuuteen kykenevä, rajatulla piha-alueella itsenäisesti toi-
mivien pienlaitteiden, kuten ruohonleikurin tai lumilingon, paikannusjärjestelmä
HD- tai UHD-tasoisten web- tai usb-kameroiden avulla.The aim of this study is to find out possibility to use two or more webcams
to positioning and identifying the target. In this study is presented math formu-
las and procedure to positioning the target with help of two or more webcams. In
conclusion can say that is possible to build positioning system that has reasonably
enough accuracy, about 10 cm, using HD- or UHD-level web- or usb-cameras, and
wich works in adjacent area for positioning of autonomous lawn mover or snow-
blower.unknown accessibilityei tietoa saavutettavuudest
Highly efficient laser-driven Compton gamma-ray source
Get PDFThe recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultrashort brilliant gamma-rays in an ultra-compact system. However, so far achieved Compton gamma-ray sources are limited by low conversion efficiency and spectral intensity. Here we present a highly efficient gamma photon emitter obtained by irradiating a high-intensity laser pulse on a miniature plasma device consisting of a plasma lens and a plasma mirror. This concept exploits strong spatiotemporal laser-shaping process and high-charge electron acceleration process in the plasma lens, as well as an efficient nonlinear Compton scattering process enabled by the plasma mirror. Our full three-dimensional particle-in-cell simulations demonstrate that in this novel scheme, brilliant gamma-rays with very high conversion efficiency (higher than 10(-2)) and spectral intensity (similar to 10(9) photons/0.1%BW) can be achieved by employing currently available petawatt-class lasers with intensity of 10(21) W cm(-2). Such efficient and intense gamma-ray sources would find applications in wide-ranging areas. ©2019 The Author(s)
Fig. ¹. 7KRWWHD EHXQJRQJWDQRHK MustaqimNJ ANJ Living plantNJ BNJ Leaf, adaxial sideNJ CNJ Leaf, abaxial sideNJ DNJ InflorescencesNJ ENJ Flower, lateral viewNJ FNJ Flower, top viewNJ GNJ Perianth, outer surfaceNJ HNJ Perianth, inner surfaceNJ INJ StamensNJ JNJ Style and stigmaNJ KNJ Immature capsuleNJ Scale bars: B-C, F = 1 cm, D-E = 1 cm, G = 5 mm, H-J = 1 mm, K = 5 mmNJ Photographed by Wendy ANJ Mustaqim in Thottea beungongtanoeh (Aristolochiaceae), a new species Irom Aceh, northern Sumatra
No full textFig. ¹. 7KRWWHD EHXQJRQJWDQRHK MustaqimNJ ANJ Living plantNJ BNJ Leaf, adaxial sideNJ CNJ Leaf, abaxial sideNJ DNJ InflorescencesNJ ENJ Flower, lateral viewNJ FNJ Flower, top viewNJ GNJ Perianth, outer surfaceNJ HNJ Perianth, inner surfaceNJ INJ StamensNJ JNJ Style and stigmaNJ KNJ Immature capsuleNJ Scale bars: B-C, F = 1 cm, D-E = 1 cm, G = 5 mm, H-J = 1 mm, K = 5 mmNJ Photographed by Wendy ANJ MustaqimPublished as part of Mustaqim, Wendy A. & Arico, Zulfan, 2022, Thottea beungongtanoeh (Aristolochiaceae), a new species Irom Aceh, northern Sumatra, pp. 587-590 in Taiwania 67 (4) on page 588, DOI: 10.6165/tai.2022.67.587, http://zenodo.org/record/745908
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