3,517 research outputs found
An Experimental Study of Wind Resistance and Power Consumption in MAVs with a Low-Speed Multi-Fan Wind System
No full textThis paper discusses a low-cost, open-source and open-hardware design and performance evaluation of a low-speed, multi-fan wind system dedicated to micro air vehicle (MAV) testing. In addition, a set of experiments with a flapping wing MAV and rotorcraft is presented, demonstrating the capabilities of the system and the properties of these different types of drones in response to various types of wind. We performed two sets of experiments where a MAV is flying into the wake of the fan system, gathering data about states, battery voltage and current. Firstly, we focus on steady wind conditions with wind speeds ranging from 0.5 m S-1 to 3.4 m S-1. During the second set of experiments, we introduce wind gusts, by periodically modulating the wind speed from 1.3 m S−1 to 3.4 m S−1 with wind gust oscillations of 0.5 Hz, 0.25 Hz and 0.125 Hz. The “Flapper” flapping wing MAV requires much larger pitch angles to counter wind than the “CrazyFlie” quadrotor. This is due to the Flapper's larger wing surface. In forward flight, its wings do provide extra lift, considerably reducing the power consumption. In contrast, the CrazyFlie's power consumption stays more constant for different wind speeds. The experiments with the varying wind show a quicker gust response by the CrazyFlie compared with the Flapper drone, but both their responses could be further improved. We expect that the proposed wind gust system will provide a useful tool to the community to achieve such improvements.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.Control & Simulatio
Fabrication of a Flexible UV Band-Pass Filter Using Surface Plasmon Metal-Polymer Nanocomposite Films for Promising Laser Applications
No full textWe introduce a strategy for the fabrication of silver/polycarbonate (Ag/PC) nanocomposite flexible films of (20 +/- 0.01) mu m thickness with different filling factor of surface plasmon metal using customized solution cast thermal evaporation method. Structural characterizations confirmed the good crystallinity with cubic phase of Ag nanoparticles in PC films. Moreover, the microstructural evolutions of nanocomposite films are investigated by transmission electron microscopy, which indicates that the metal fraction is in the form of fractals. Additionally, the surface plasmonic behavior of nanocomposite films has been explored in detail to examine the distribution of Ag nanoparticles in PC film by spectroscopic technique. Furthermore, the obtained transmittance spectral features of this nanocomposite film are suitable for the applications of band-pass filter at 320 nm UV range, which is highly desirable for a HeCd laser
sj-docx-1-pie-10.1177_09544089221108680 - Supplemental material for Parameter optimization for enhancing tribological properties of sol–gel alumina and aluminum silicate-coated aluminum alloy: Grey–Taguchi method
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221108680 for Parameter optimization for enhancing tribological properties of sol–gel alumina and aluminum silicate-coated aluminum alloy: Grey–Taguchi method by Renjish Vijay, VN Aju Kumar, A Sadiq, Baiju Sasidharan, M Mohammed Arif and S Rani in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
FIGURE 1 in Consolidated Checklist of Hard Corals of the Genus Acropora Oken, 1815 (Scleractinia: Acroporidae) in North Borneo, East Malaysia
No full textFIGURE 1. Localities of the Acropora reported in this checklist.Published as part of Robert, Rolando, Lee, Dexter Jiunn Herng, Rodrigues, Kenneth Francis, Hussein, Muhammad Ali Syed, Waheed, Zarinah & Kumar, S. Vijay, 2016, Consolidated Checklist of Hard Corals of the Genus Acropora Oken, 1815 (Scleractinia: Acroporidae) in North Borneo, East Malaysia, pp. 259-304 in Zootaxa 4200 (2) on page 262, DOI: 10.11646/zootaxa.4200.2.2, http://zenodo.org/record/18213
Opening Up Education: The Collective Advancement of Education through Open Technology, Open Content, and Open Knowledge
No full textGiven the abundance of open education initiatives that aim to make educational assets freely available online, the time seems ripe to explore the potential of open education to transform the economics and ecology of education. Despite the diversity of tools and resources already available -- from well-packaged course materials to simple games, for students, self-learners, faculty, and educational institutions -- we have yet to take full advantage of shared knowledge about how these are being used, what local innovations are emerging, and how to learn from and build on the experiences of others. Opening Up Education argues that we must develop not only the technical capability but also the intellectual capacity for transforming tacit pedagogical knowledge into commonly usable and visible knowledge: by providing incentives for faculty to use (and contribute to) open education goods, and by looking beyond institutional boundaries to connect a variety of settings and open source entrepreneurs.These essays by leaders in open education describe successes, challenges, and opportunities they have found in a range of open education initiatives. They approach -- from both macro and micro perspectives -- the central question of how open education tools, resources, and knowledge can improve the quality of education. The contributors (from leading foundations, academic institutions, associations, and projects) discuss the strategic underpinnings of their efforts first in terms of technology, then content, and finally knowledge. They also address the impact of their projects, and how close they come to achieving a vision of sustainable, transformative educational opportunities that amounts to much more than pervasive technology.Contributors:Richard Baraniuk, Randy Bass, Trent Batson, Dan Bernstein, John Seely Brown, Barbara Cambridge, Tom Carey, Catherine Casserly, James Dalziel, Bernadine Chuck Fong, Richard Gale, Gerard Hanley, Diane Harley, Mary Huber, Pat Hutchings, Toru Iiyoshi, David Kahle, M. S. Vijay Kumar, Andy Lane, Diana Laurillard, Stuart Lee, Steve Lerman, Marilyn Lombardi, Phil Long, Clifford Lynch, Christopher Mackie, Anne Margulies, Owen McGrath, Flora McMartin, Shigeru Miyagawa, Diana Oblinger, Neeru Paharia, Cheryl Richardson, Marshall Smith, Candace Thille, Edward Walker, and David WileyAbout the Editors:Toru Iiyoshi is Senior Scholar and Director of the Knowledge Media Lab at the Carnegie Foundation.M. S. Vijay Kumar is Senior Associate Dean and Director of the Office of Educational Innovation and Technology at MIT
The Shunt Active Power Filter to Compensate Reactive Power and optimized THD with Improved Power by PI controller in a 3 Phase 3 Wire Distribution Network
No full textThree phase induction motors are the most common and frequently encountered machines in industry. This type of machines has simple in design and easy to maintain. This project deals with study and analysis of performance of induction motor and study and implementation of various possible controllers using vector control scheme. The PI and PID controller has been discussed and literature survey has been carried out. On the basis of literature survey PI and PID control system are developed here. Mr. Swapnil S. Managule | Dr. E Vijay Kumar "The Shunt Active Power Filter to Compensate Reactive Power and optimized THD with Improved Power by PI controller in a 3 Phase 3 Wire Distribution Network" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-5 , August 2018, URL: https://www.ijtsrd.com/papers/ijtsrd18197.pd
Bilateral Symptomatic Carotid Free Floating Thrombi.
No full textNEUROLOGY INDIA693770-771Indiacomplete
Protein phosphatase 2A inhibits interferon signaling through the Jak STAT pathway and promotes hepatitis C viral replication
No full textThe first part of the work demonstrate the role of PP2A in IFN-α induced Jak-STAT1 signaling and HCV replication. We show here that PP2Ac activity is not required for IFN-α induced tyrosine phosphorylation of Jak1/Tyk2 and STAT1. In response to IFN-α induction, PP2Ac associates with Jak1/Tyk2 and STAT1. This association modulates the Jak1/Tyk2 and STAT1 tyrosine phosphorylation. However, this study shows that PP2A activity is required for the HCV replication.
The selective behavior of PP2A for Jak-STAT1 signaling pathway inhibition and promotion of HCV replication could be due to the targeted substrate selection by PP2A holoenzyme complex. In the second part of this work, attempts were made to determine the specific regulatory B subunits involved in IFN-α induced Jak-STAT1 signaling inhibition and HCV replication. We observed the inter-regulatory behavior of PP2A subunits. During the course of this study, due to unavailability of specific antibodies for various isoforms of B subunit, the aim to determine specific holoenzyme complex involved in regulation of Jak-STAT1 signaling and HCV replication was not achieved.
Further studies are required to investigate the specific B subunits and thereby holoenzyme complex responsible for IFN-α induced Jak-STAT signaling inhibition and HCV replication by PP2A
Self-supervised Monocular Multi-robot Relative Localization with Efficient Deep Neural Networks
No full textRelative localization is an important ability for multiple robots to perform cooperative tasks in GPS-denied environments. This paper presents a novel autonomous positioning framework for monocular relative localization of multiple tiny flying robots. This approach does not require any groundtruth data from external systems or manual labeling. Instead, the proposed framework is able to label real-world images with 3D relative positions between robots based on another onboard relative estimation technology, using ultra-wideband (UWB). After training in this self-supervised manner, the proposed deep neural network (DNN) can predict relative positions of peer robots by purely using a monocular camera. This deep learning-based visual relative localization is scalable, distributed, and autonomous. We also built an open-source and lightweight simulation pipeline by using Blender for 3D rendering, which allows synthetic image generation of other robots, and generalized training of the neural network. The proposed localization framework is tested on two real-world Crazyflie2 quadrotors by running the DNN on the onboard AIdeck (a tiny AI chip and monocular camera). All results demonstrate the effectiveness of the self-supervised multi-robot localization method. Video: https://youtu.be/7arkaIblPpsGreen 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.Control & Simulatio
Opening Up Education
No full textExperts discuss the potential for open education tools, resources, and knowledge to transform the economics and ecology of education.Given the abundance of open education initiatives that aim to make educational assets freely available online, the time seems ripe to explore the potential of open education to transform the economics and ecology of education. Despite the diversity of tools and resources already available—from well-packaged course materials to simple games, for students, self-learners, faculty, and educational institutions—we have yet to take full advantage of shared knowledge about how these are being used, what local innovations are emerging, and how to learn from and build on the experiences of others. Opening Up Education argues that we must develop not only the technical capability but also the intellectual capacity for transforming tacit pedagogical knowledge into commonly usable and visible knowledge: by providing incentives for faculty to use (and contribute to) open education goods, and by looking beyond institutional boundaries to connect a variety of settings and open source entrepreneurs. These essays by leaders in open education describe successes, challenges, and opportunies they have found in a range of open education initiatives. They approach—from both macro and micro perspectives—the central question of how open education tools, resources, and knowledge can improve the quality of education. The contributors (from leading foundations, academic institutions, associations, and projects) discuss the strategic underpinnings of their efforts first in terms of technology, then content, and finally knowledge. They also address the impact of their projects, and how close they come to achieving a vision of sustainable, transformative educational opportunities that amounts to much more than pervasive technology.Through the support of the Carnegie Foundation for the Advancement of Teaching, an electronic version of this book is openly available under a Creative Commons license at The MIT Press Web site, http://mitpress.mit.edu. ContributorsRichard Baraniuk, Randy Bass, Trent Batson, Dan Bernstein, John Seely Brown, Barbara Cambridge, Tom Carey, Catherine Casserly, Bernadine Chuck Fong, Ira Fuchs, Richard Gale, Mia Garlick, Gerard Hanley, Diane Harley, Mary Huber, Pat Hutchings, Toru Iiyoshi, David Kahle, M. S. Vijay Kumar, Andy Lane, Diana Laurillard, Stuart Lee, Steve Lerman, Marilyn Lombardi, Phil Long, Clifford Lynch, Christopher Mackie, Anne Margulies, Owen McGrath, Flora McMartin, Shigeru Miyagawa, Diana Oblinger, Neeru Paharia, Cheryl Richardson, Marshall Smith, Candace Thille, Edward Walker, David Wile
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