4,466 research outputs found
Fast interfaces
No full textLi4Ti5O12 is a commonly used negative electrode material, but the origin of its fast rate capability has puzzled scientists for decades. Now, a facile Li-ion transport route featuring metastable intermediates is revealed to rationalize the fast-charging kinetics.Accepted Author ManuscriptRID/TS/Instrumenten groepRST/Storage of Electrochemical Energ
Experimental and numerical investigation on the heel and drift induced hydrodynamical loads of a high speed craft
No full textIn order to provide an insight into the manoeuvring of high speed crafts, an experimental study was undertaken at the towing tank of Delft University of Technology, using a rescue vessel of the Royal Netherlands Sea Rescue Institution (KNRM).Ship Hydromechanics and Structure
Effects of Moritella viscosa antigens on pro-inflammatory gene expression in an Atlantic salmon (Salmo salar Linnaeus) cell line (SHK-1)
No full textMoritella viscosa is the causative agent of winter ulcer disease in salmonids reared in North-Atlantic countries. In this study the effects of selected M. viscosa antigens on cytotoxicity and pro-inflammatory gene expression in an Atlantic salmon (Salmo salar Linnaeus) macrophage-like cell line (SHK-1) were examined. SHK-1 cells were stimulated with live and heat-killed bacterial cells, extracellular products (ECP) and an extracellular vibriolysin, termed MvP1. Following incubation, cytotoxicity and expression levels of interleukin-1β (IL-1β) and interleukin-8 (IL-8) were examined at different time points. Both live M. viscosa cells and ECP were cytotoxic, but neither heat-killed cells, nor the MvP1 peptidase caused cell death. Expression levels of both IL-1β and IL-8 increased significantly after stimulation with live cells, but heat-killed cells only caused increased IL-8 expression. ECP did not affect IL-1β expression, but did stimulate IL-8 expression. The isolated MvP1 peptidase stimulated both IL-1β and IL-8 expression at the highest concentration tested. This study reveals a difference in the induction of pro-inflammatory gene expression in salmon SHK-1 cells between live and heat-killed M. viscosa cells, and also that an unknown secreted factor is the main stimulant of IL-β and IL-8 expression.ID: S1050464809000990; M3: Article; Accession Number: S1050464809000990; Author: Bryndis Bjornsdottir (a, b); Author: Mark D. Fast (b, 1); Author: Sandra A. Sperker (b); Author: Laura L. Brown (b, 2); Author: Bjarnheidur K. Gudmundsdottir (a, ∗); Affiliation: Institute for Experimental Pathology, University of Iceland, Keldur v/Vesturlandsveg, 112 Reykjavík, Iceland; Affiliation: National Research Council Canada, Institute for Marine Biosciences, 1411 Oxford Street, Halifax, Nova Scotia B3H 2Z1, Canada; Keyword: Moritella viscosa; Keyword: Extracellular products; Keyword: MvP1 vibriolysin; Keyword: Atlantic salmon; Keyword: SHK-1; Keyword: Gene expression; Keyword: Immune response; Keyword: Pro-inflammatory cytokine; Keyword: Interleukin-1β (IL-1β); Keyword: Interleukin-8 (IL-8); Number of Pages: 6; Language: English;Source type: Electronic(1
Mutations in the Aeromonas salmonicida subsp. salmonicida type III secretion system affect Atlantic salmon leucocyte activation and downstream immune responses
No full textDeletion mutants of Aeromonas salmonicida subsp. salmonicida were used to determine the effect of the type three secretion system (TTSS) on Atlantic salmon anterior head kidney leucocytes (AHKL). One strain had a deletion in the outer membrane pore gene, ascC; and the other in three effector genes: aopO, aopH and aexT (we call this strain Δaop3). Host cell invasion success and 24h survival were depressed in ΔascC, as was 24h survival of Δaop3, when compared to the wild type strain. Challenge of AHKLs with A449 or TTSS mutants stimulated expression of the inflammatory mediators IL-8, IL-1 and TNFα at two bacterial concentrations (A600 0.1, 0.01). Expression of IL-12 was not stimulated in ΔascC challenged cells, whereas A449 and Δaop3 challenge resulted in an up-regulation of IL-12 in AHKLs, 2- and 4-fold higher than PBS, respectively. Only the wild type strain elicited a significant increase in IL-10 expression (5.5× at A600 0.1). Inducible nitric oxide synthetase (iNOS) and arginase (I+II) genes were also significantly up-regulated upon exposure to all strains. However, iNOS:arginase ratio was elevated in the effector mutant challenge. These results suggest that A. salmonicida subsp. salmonicida may enhance survival within the host cell through polarization of macrophages/leucocytes to an alternative, rather than classical, activation state. Furthermore, the short-term survival and lack of T-cell signalling cytokine stimulation in ΔascC, may help explain its inefficiency at providing protection to subsequent wild type challenge.ID: S1050464809002988; M3: Article; Accession Number: S1050464809002988; Author: Mark D. Fast (a, ∗); Author: Brenda Tse (b); Author: Jessica M. Boyd (c); Author: Stewart C. Johnson (d); Affiliation: School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York 11794-5000, USA; Affiliation: Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada; Affiliation: Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada; Affiliation: Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, British Columbia, Canada; Keyword: Aeromonas salmonicida; Keyword: Type three secretion system; Keyword: Atlantic salmon; Keyword: SHK-1; Keyword: Gene expression; Keyword: Inflammation; Keyword: Activation; Keyword: Interleukin-1β; Keyword: (IL-1β); Keyword: Interleukin-10; Keyword: Interleukin-12; Number of Pages: 8; Language: English;Source type: Electronic(1
FAST-EDI
No full text# Fast Event-based Double Integral for Real-time Robotics (Academic Use Only)
## [Paper](https://arxiv.org/abs/2305.05925) | [Video: Youtube](https://www.youtube.com/watch?v=xzrHNA97wls) | [Video: Bilibili](https://www.bilibili.com/video/BV1qL411X7hc/?share_source=copy_web&vd_source=2483c9488f1bd3f3478cf69bfca4d49e)
Motion deblurring is a critical ill-posed problem that is important in many vision-based robotics applications. The recently proposed event-based double integral (EDI) provides a theoretical framework for solving the deblurring problem with the event camera and generating clear images at high frame-rate. However, the original EDI is mainly designed for offline computation and does not support real-time requirement in many robotics applications. In this paper, we propose the fast EDI, an efficient implementation of EDI that can achieve real-time online computation on single-core CPU devices, which is common for physical robotic platforms used in practice. In experiments, our method can handle event rates at as high as 13 million event per second in a wide variety of challenging lighting conditions. Its benefit has been demonstrated on multiple downstream real-time applications, including localization, visual tag detection, and feature matching.
## Understanding the hardware bias of event camera
[Tutorial of the bias](https://gitlab.com/inivation/inivation-docs/blob/master/Advanced configurations/User_guide_-_Biasing.md)
## Checking the hardware bias using the jAER
One can use the jAER project to get a roughly estimated contrast from the bias currents that are estimated to be generated by the on-chip bias generator bias current ratios:[jAER homepage](https://github.com/SensorsINI/jaer)
Discussion regarding the bias estimation:[discussion](https://groups.google.com/g/davis-users/c/68gp0zxTMUk/m/SpweyJKrDgAJ)
and the physical model that build to estimate the threshold:[Paper](https://ieeexplore.ieee.org/document/7962235/)
## Usage
Test env:
```
ubuntu 18.04
dv-runtime 1.6.1
dv-gui 1.6.0
```
1. download the DV and install it following the tutorial [DV install guide](https://inivation.gitlab.io/dv/dv-docs/docs/getting-started.html)
2. download the fast EDI code
```
git clone https://github.com/eleboss/fast_EDI
```
3. compile the fast EDI module
```
cd ./dv-module/fast-edi
cmake ./
make
```
then you will see the `fedi_FEDI.so`, this is the file you need to add to the dv-gui.
4. configure the DV-GUI search path
```
dv-gui
```
find the `structure - add modules - modify module search path - add path` (this path leads to `fedi_FEDI.so`, for me is `/home/eleboss/Documents/fast_EDI/dv-module/fast-edi`). Then you can add the fast edi modules to the dv-gui and wires it in this way:
5. download the test data [dataset](www.google.com), and play it.
Performance tips: You can tune the contrast or use the jAER to estimate, or use EDI to optimize an accurate contrast.
## Citation
```
@article{lin2023fast,
title={Fast Event-based Double Integral for Real-time Robotics},
author={Lin, Shijie and Zhang, Yingqiang and Huang, Dongyue and Zhou, Bin and Luo, Xiaowei and Pan, Jia},
booktitle={international conference on robotics and automation (ICRA)},
year={2023},
organization={IEEE}
}
```
</p
2016-08-25 Fast Walstrom Outlaw Supplemental File.docx
No full text2016-08-25 Fast Walstrom Outlaw Supplemental File.doc
GENERAL CLASS OF WINDMILL POLYNOMIALS FOR FAST M-SEQUENCE GENERATION
No full textSummary form only given. The windmill technique is an attractive alternative to the Lempel-Eastman technique for fast m-sequence generation. The author has generalized the class of linear recurrence relations for which the windmill technique results in an m-sequence generator. A converse to a set of known necessary conditions has been obtained
GENERAL CLASS OF WINDMILL POLYNOMIALS FOR FAST M-SEQUENCE GENERATION.
No full textSummary form only given. The windmill technique is an attractive alternative to the Lempel-Eastman technique for fast m-sequence generation. The author has generalized the class of linear recurrence relations for which the windmill technique results in an m-sequence generator. A converse to a set of known necessary conditions has been obtained
A discontinuous Galerkin FEM multi-physics solver for the molten salt fast reactor
No full textNumerical simulations of fast MSRs constitute a challenging task. In fact, classical codes employed in reactor physics cannot be used, and new dedicated multi-physics tools must be developed, to capture the unique features of these systems: the strong coupling between neutronics and thermal-hydraulics due to the use of a liquid fuel, the effects on reactor kinetics induced by the precursors drift, the internal heat generation, and the shape of the core having no fuel pins as a repeated structure. In this work, we present a novel multi-physics tool being developed at TU Delft. The coupling is realized between an SN radiation transport code (PHANTOM-SN) and a RANS solver (DGFlows). Both in-house tools are based on a Discontinuous Galerkin Finite Element space discretization, characterized by local conservation, high-order accuracy, and allowing for high geometric flexibility. Implicit discretization in time is performed adopting Backward Differentiation Formulae. Cross sections are computed on an element base, starting from the local average temperature and a set of libraries generated at reference temperatures with Monte Carlo or deterministic codes. Comparison of the results obtained performing a suitable numerical benchmark created at LPSC/CNRS/Grenoble with those available in literature shows that the multi-physics tool is able to capture the unique phenomena characterizing fast liquid-fueled systems.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.RST/Reactor Physics and Nuclear MaterialsRST/Radiation, Science and Technolog
Impact of ICRF fast-ions on core turbulence and MHD activity in ASDEX upgrade
No full textFunding Information: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. Funding Information: We wish to acknowledge M. Bergmann, M. Brambilla, P. David, R. Mc Dermott, Ph. Lauber, U. Plank, M. Reisner, S. Sharapov, G. Staebler, G. Tardini, E. Viezzer, B. Zimmermann, and to thank A. Kappatou, E. Tsitrone and A. Hakola for their kind support. J. Galdon-Quiroga acknowledges funding from the Spanish Ministry of Science and Innovation under grant no. FJC2019-041092-I. See the author list of U. Stroth et al. 2022 Nucl. Fusion 62 042006 for the ASDEX Upgrade Team; see the author list of B. Labit et al. 2019 Nucl. Fusion 59 086020 for the EUROfusion MST1 team. Publisher Copyright: © 2023 Author(s).Experiments in various tokamaks and their analysis identify the fast ions (FI) generated by NBI and/or ICRF heating as one of the main causes of the observed improvement in core confinement: fast ions can reduce core microturbulence (mainly Ion-Temperature-Gradient (ITG) driven modes) either electrostatically or electromagnetically, or they can resonate with fishbones and high-frequency Alfvén modes, which in turn contribute in stabilizing ITG. In this perspective, we discuss recent experiments done on ASDEX Upgrade (AUG) where ICRF is the main actuator for FI generation for energies above 100 keV. Additionally, ICRF-FIs can substantially impact the MHD activity and its consequent effects on fast ion losses (FILs) and ion-cyclotron emission (ICE). We present dedicated AUG experiments with NBI-D further accelerated by ICRF.Peer reviewe
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