Month: August 2019

NTT demos 80211ac next generation highspeed WiFi

first_img(PhysOrg.com) — Nippon Telegraph and Telephone Corporation (NTT) has demonstrated what might be the next version of high speed WiFi. Currently named 802.11ac, (wireless transmission traditionally uses .11 as opposed to .3 for Ethernet, or cable based transmission) the new proposed standard was shown to deliver 120Mbps throughput to three receivers at the same time. Citation: NTT demos 802.11ac – next generation high-speed WiFi (2011, July 11) retrieved 18 August 2019 from https://phys.org/news/2011-07-ntt-demos-80211ac-high-speed.html Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The new standard uses the same 5GHz bandwidth as is currently used now in home WiFi systems; to get it to carry more data, the signal is multiplexed (sent out as round-robin bits of data from several different sources) on one end, and then de-multiplexed on the other, all using multiple-user Multiple Input Multiple Output (MIMO) technology that in this case has been developed by NTT. The object is to get 1 Gbps per system, a rate that will be needed as bandwidth hogging applications such as ever higher video resolution or 3D content creates demand for ever faster LAN systems able to deliver such huge amounts of data to always hungry-for-more, customers. In the NTT demo at the Wireless Technology Park, in Yokohama, six antennas were used to deliver the signal, and three to receive it. The new technology developed by NTT relies on a Field Programmable Gate Array (FPGA) that utilizes mathematical algorithms to set space divisions for the data as its being multiplexed into its individual parts, and then of course to do the reverse on the other end. According to NTT, this processing could be done with a dedicated chip, instead of the FPGA, should the new standard be approved by the International IEEE standards body.Even if all goes according to plan, though, the new standard isn’t likely to be adopted until at least 2013, though that doesn’t necessarily mean products won’t ship before that date that utilize the proposed new standard, as was done with earlier wireless standards. Also helpful is the fact that 802.11ac, whatever its final form, will offer full backwards compatibility with the current version, meaning early adopters won’t do any worse than what they have now, and likely will do much better as new hardware comes available.Looking ahead past 802.11ac, the next generation of wireless LAN technology, initially dubbed 802.11ag is expected to step outside of the 5GHz currently unlicensed space, and to shoot for a tenfold gain in throughput. © 2010 PhysOrg.com NTT DoCoMo Achieves World’s First 5Gbps Packet Transmission in 4G Field Experimentlast_img read more

New exploration shows parts of North Atlantic seabed were once above sea

first_img Extending for 3,861 square miles (10,000 square km) just north east of the Orkney-Shetland Islands, and about 1.2 miles (almost 2 kilometers) beneath the surface, the undersea terrain appears to have once existed above sea level, forming an island. By examining data from echo-sounding technology employed by contractors working for oil companies, maps of the ocean floor were able to be made. The maps constructed are 3-D in nature, and thus are able to show not just the ocean floor, but what lies beneath; hence its use in looking for oil. In looking at the maps, the researchers were able to see that beneath the layers of silt and other assorted debris, was a lost land of sorts, one that had been pushed up by the Icelandic Plume, or expansion of the mantle due to the hot magma below.The images constructed were sharp enough to allow the researchers to identify ancient rivers and mountain peaks and even some fossils, all from some 56 million years ago. The images also suggest that the ocean floor rose in three distinct stages of about 200-400 m each, creating the island which they believe lasted for about a million years, before once again disappearing beneath the cold waters of the North Atlantic Sea. White describes the seascape as appearing for all the world like that of a modern landscape.The echo-technology used by the contractors involved releasing highly pressurized air beneath the surface of the sea, which produced sound waves capable of passing through the ocean floor sediment. When the sound waves eventually bounced back, they were captured by microphones dragged behind a boat and fed into a computer to produce the 3-D images.The initial research team followed up on the 3-D imagery by taking core samples, some of which contained pollen and coal, suggesting land-dwelling life once existed there. The Cambridge team also found fossils indicating there was also a marine environment at one time.The research team thinks that the now sunken landscape is part of a much bigger region that at one time merged with modern Scotland and may have reached all the way to Norway. © 2010 PhysOrg.com Citation: New exploration shows parts of North Atlantic seabed were once above sea level (2011, July 12) retrieved 18 August 2019 from https://phys.org/news/2011-07-exploration-north-atlantic-seabed-sea.html Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. UNH-NOAA ocean mapping expedition yields new insights into arctic depths More information: Transient convective uplift of an ancient buried landscape, Nature Geoscience (2011) doi:10.1038/ngeo1191AbstractSedimentary basins in the North Atlantic Ocean preserve a record of intermittent uplift during Cenozoic times. These variations in elevation are thought to result from temperature changes within the underlying Icelandic mantle plume. When parts of the European continental shelf were episodically lifted above sea level, new landscapes were carved by erosion, but these landscapes then subsided and were buried beneath marine sediments. Here, we use three-dimensional seismic data to reconstruct one of these ancient landscapes that formed off the northwest coast of Europe during the Palaeocene–Eocene Thermal Maximum. We identify a drainage network within the landscape and, by modelling the profiles of individual rivers within this network, we reconstruct the history of surface uplift. We show that the landscape was lifted above sea level in a series of three discrete steps of 200–400 m each. After about 1 million years of subaerial exposure, this landscape was reburied. We use the magnitude and duration of uplift to constrain the temperature and velocity of a mantle-plume anomaly that drove landscape formation. We conclude that pulses of hot, chemically depleted, mantle material spread out radially beneath the lithospheric plate at velocities of ~35 cm yr−1. Image (c) R A Hartley et al./Nature Geoscience (2011) doi:10.1038/ngeo1191 (PhysOrg.com) — Using data obtained from oil searching contractors, researchers have discovered that parts of what is now the ocean floor off the northern coast of Scotland, were at one time raised up enough by thermal expansion beneath to have jutted at least 1 kilometer above the sea. Nicky White, senior researcher from the University of Cambridge and his team explain what they’ve found in their paper published in Nature Geoscience.last_img read more

Chemists offer more evidence of RNA as the origin of life

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Understanding how slow predators catch faster prey could improve drone tactics

first_img Journal information: New Journal of Physics (Phys.org)—Since a gazelle can run faster than a lion, how do lions ever catch gazelles? A new model of predator-prey interaction shows how groups of predators use collective chasing strategies, such as cornering and circling, to pursue and capture faster prey. Without this tactical collaboration, the predators would have no chance of catching these prey. Simulations of predators (blue dots) chasing a faster prey (red dot). Credit: Janosov et al. Published in New Journal of Physics. © 2017 Phys.org Modelling explains how hunters team up to catch faster prey Explore further In their model, the researchers also observed emergent behavior, which is behavior that appears only in groups. In particular, groups of predators often begin to encircle their prey, and this behavior arises directly from the chasing rules. In nature, it’s common for prey to sometimes run in a zigzag pattern to confuse the predator, and to eventually run directly away from the predator in a straight line. The researchers also observed these strategies in their model, and found that zigzagging is especially advantageous when the predators have a long delay in responding.In the future, the researchers expect that additional interesting results can be obtained by modifying the model, such as investigating situations with multiple fast prey and equipping predators and prey with machine learning algorithms. “Our major goal in this research was to gain a deeper understanding of the collective behavior of animals, to extend our knowledge on fundamental questions on animal behavior,” Janosov said. “However, given the fact that our research group is developing collective motion algorithms for our flock of quadrocopters, there are plenty of potential applications we could propose. For example, a group of tactical drones using smart encircling strategies could become even lifesaving in the case of terrorist attacks, when the goal is to capture terrorist flying vehicles, or chasing criminals in narrow, highly populated urban areas. “Besides these, our results could have potential applications even in the entertainment industry in developing field games, possibly combined with virtual reality tools, or by the streaming of popular sport events, especially those that are widely spread in space—for example, bike or car races.” The results are not only relevant for understanding wildlife, but also have potential applications for drone-flying strategies and in the entertainment industry.The researchers, Milán Janosov, Csaba Virágh, Gábor Vásárhelyi, and Tamás Vicsek at the MTA-ELTE Statistical and Biological Physics Research Group, Hungary, have published their paper on their new model of collective chasing strategies in a recent issue of the New Journal of Physics.”After many previous efforts, we managed to give a simple, yet surprisingly life-like explanation of how predator animals can form successful hunting packs, and by that drastically enhance their chances of being successful on a hunt,” Janosov told Phys.org. “This is particularly interesting because we managed to model these exceptionally complex systems—the hunting groups of large carnivores—in a simulation resembling realistic features of animal pursuits, such as encircling, optimal group size, and finite space, only by using a set of compact rules formulated as force-like interactions in physics.”Although there are other models that describe predator-prey interactions, the new model is different because of the large number of factors it accounts for, such as the prey’s panic threshold, the predator’s ability to predict the prey’s future position, and the interaction between multiple predators, within closed boundaries with realistic measures. All of these parameters contribute to making a more realistic model that accurately describes behaviors observed in nature by groups of predators such as lions, wolves, and coyotes.By running simulations and measuring the effectiveness of different combinations of parameter values, the researchers determined the optimal combinations that resulted in the most successful group chasing strategies. Among their results, they found that just one or two predators can never catch a faster prey, and that groups of three or more succeed only with certain collaborative strategies. More information: Milán Janosov et al. “Group chasing tactics: how to catch a faster prey.” New Journal of Physics. DOI: 10.1088/1367-2630/aa69e7 Play Credit: Video abstract, New Journal of Physics. DOI: 10.1088/1367-2630/aa69e7 The model revealed that three predators forms an optimal group when chasing in two dimensions (such as on land) in a confined space. In three dimensions (such as in the air or under water), chasing becomes more challenging, and groups of five are optimal. These group sizes are comparable to those observed in nature. Somewhat surprisingly, the researchers also found that an odd number of chasers does better than an even number, which is due to geometrical reasons: with an even number, it’s more likely that a gap remains between predators that allows the prey to escape. PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Citation: Understanding how slow predators catch faster prey could improve drone tactics (2017, May 29) retrieved 18 August 2019 from https://phys.org/news/2017-05-predators-faster-prey-drone-tactics.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Flexible color displays with microfluidics

center_img More information: Kazuhiro Kobayashi et al. Microfluidic-based flexible reflective multicolor display, Microsystems & Nanoengineering (2018). DOI: 10.1038/s41378-018-0018-1Power-free poly(dimethylsiloxane) microfluidic devices for gold nanoparticle-based DNA analysis dx.doi.org/10.1039%2Fb403930k, Hosokawa et al, 2004, Royal Society of Chemistry, Lab on a Chip.Two-dimensional flexible nanoelectronics, www.nature.com/articles/ncomms6678, Akinwande et al, Review, December 2014, Nature Communications.All-organic active matrix flexible display aip.scitation.org/doi/abs/10.1 … 8213?journalCode=apl Zhou L et al, 2006 Appl. Phys. Lett. Organic thin-film transistor-driven polymer-dispersed liquid crystal displays on flexible polymer substrates aip.scitation.org/doi/10.1063/1.1448659, Sheraw et al, 2002, Appl. Phys. Lett. PDMS-based micro PCR chip with Parylene coating iopscience.iop.org/article/10. … 60-1317/13/5/332/pdf, Shin et al, 2003, J. Micromech. Microeng. Electronic paper: flexible active-matrix electronic ink display www.nature.com/articles/423136a Chen, et al, Brief Communication, May 2003, Nature. Citation: Flexible color displays with microfluidics (2018, August 16) retrieved 18 August 2019 from https://phys.org/news/2018-08-flexible-microfluidics.html Experimental results validated that the system could display multicolored reflective images and retain them without energy consumption as theorized. The images were durable while maintaining their position after pliable twisting, to indicate flexibility and recovery of the original multicolored framework. The scientists predict that such flexible and energy-less display systems may find innovative applications on robot skins, clothes and accessories in daily life in the future. In the study, a range of images were created in this way in zig-zag microchannels as proof of principle to test the proposed concept of flexible multicolor reflective displays. Color retention was enabled by stopping the suction system, during which the orientation of the display remained intact without energy supply. , Lab on a Chip The proof-of-principle of a three-color dot matrix a) multicolored stripe patterns (vertically and horizontally aligned) displayed on microchannels, b-c) the bitmap characters ‘A’ and ‘T’ visualized on the microfluidic-based reflective display, d-g) testing the flexibility of the display to indicate maintenance of the original framework for multicolored display retention. Credit: Microsystems and Nanoengineering, doi: 10.1038/s41378-018-0018-1 The fabricated device for color display a) Meandering microchannels with a 7×13 pixels (25 dpi) display. Inlet and outlet ports were connected to the liquid selector and suction system, b) microscopic images of the tear-drop shaped pixels that constitute the microchannels, the white dots on each pixel were caused by visible light illuminated on the device surface, c) cross-sectional view of the microchannel, a thin parylene film was deposited within the microchannel to prevent air leakage. Credit: Microsystems and Nanoengineering, doi: 10.1038/s41378-018-0018-1 Observing the relationship between the droplet position and the timing of negative pressure applied to control the position of droplets at the level of the single-pixel. Credit: Microsystems and Nanoengineering, doi: 10.1038/s41378-018-0018-1 Explore furtherlast_img read more

In Rural Utah Preventing Suicide Means Meetin

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Odisha goes Egyptian

Two diametrically opposite places – ancient Odisha and Egypt – gave Anupama Dayal the idea behind her collection that saw a mix and match between the two places. So her ensembles were called Giza dress [a halter necked long wrap dress with little colourful wheels], Cuttack tunic [a scarlet Dupion fitted dress with side slits and ikkat prints], Ra dress [long silk dress] and Jagannath sari [a graphic black and white printed red chanderi sari with choli].

Play it on loop

first_img‘Female Dj’s are no dolly birds!’ says DJane July Loop. Before this beauty hits Zerzura on 4 May, she gets candid with Millennium Post. Read on…Tell us a bit about yourself. Where did you start from?I am from Ukraine and working as a DJ from past 4 and a half years and have travelled across the world for work. I have played in countries like Switzerland, Italy, Poland, China, Korea, Turkey, Egypt and many more. I started my career as a DJ from my own city – Ukraine.   Also Read – ‘Playing Jojo was emotionally exhausting’Where did the interest in music come in and the plans to become a DJ and go behind the console?I love listening to music and doing mixing. I was crazy about rock music since I was in my teens. I used to party a lot with my friends. One of my DJ friends taught me how to play, but at that time it was just a hobby. But now music has become a part of my life and I can’t live without music and crazy people on the dance floor.Tell us about what made it for you. Also Read – Leslie doing new comedy special with NetflixMy never-ending love for music and the crazy grooving people on the dance floor. I mark a success for myself when I make the entire crowd in the venue dance like crazy on the beats I play.  I will always remember the big artists I have worked with like Tara Mcdonald, Armin van Buuren, Dj Ralvero, Ottawan etc. They really helped me to reach where I have.     Tell us about making it big – was it a long journey and a tough struggle?In the beginning of my career I used to play in small parties, usually a pre-party.  It wasn’t a long journey for me because I got my first break to work with a well known DJ from London. It was my first assignment abroad in Istanbul. I played warm up for him. After the show we worked together for almost one month and I at that moment understood what is really to be a DJ. Is it harder to be a female DJ as compared to your male counterparts?Female DJ’s were largely regarded as a gimmick, a ‘dolly bird’  to gaze at and to be taken seriously, as someone who might actually know how to present music, was almost an impossibility. People in various countries have different mindsets.  Some people don’t believe that a female DJ can play and take a party on a high. They look at me or my photo and think I am just a model standing near the console. I love facing the challenges and with these people I love breaking of that stereotype thoughts. Usually, after my party, people come to me and say: Wow you really can play!!! What are the essential ingredients needed to become a DJ?You should love music and have an ability of sensing the crowd’s music requirements. Sometimes the taste of the crowd is far different from yours, at that moment you need to change your preferences and need to adapt according to the crowd.Is this your first visit to India? What sort of reaction are you expecting from Delhi?It is my third trip to India. I have heard that the Delhi crowd is the most energetic crowd. I am expecting a lot from the Delhiites. I want to drive my crowd crazy with my beats. Earlier Delhi crowd was only open to Bollywood and commercial music. But now with the increase of music knowledge among Delhiites the preferences has been changed. People are better informed now and they also enjoy all the genres of music. Tell us what tops your playlist right now – the top tracks on it…The top tracks on my playlists are:  Baauer – Harlem Shake; Macklemore & Ryan Lewis – Thrift Shop; Pitbull and Christina Aguilera – Feel This Moment.last_img read more

CRYing need to get them to school

first_imgChild Rights and You, India’s leading Child 30th rights NGO and its alliance, APR – Alliance for People’s Rights, organised a day long theatre festival in the capital.This was an open forum for children to speak out on issues that affect them the most in school. Shiksha Hamara Haq theme of the festival amplified the voices of more than 50 children between ages 6-14 from different parts of city. Corporal punishment and discrimination, barriers in education due to lack of infrastructure, positive impact of RTE Act are the issues which the festival addressed. Also Read – ‘Playing Jojo was emotionally exhausting’Padhna isi ka naam hai, Dhoondte reh jaoge, Thoda hai thode kee zarurat hai, were three plays where children showcased what they have observed as issues of basic infrastructure in their school, hygiene and access to playgrounds. The theatre festival was followed up by a panel discussion on the status of education in Delhi. Themes of the discussion were, ensuring enrolment of all children between 6-14 years in school, as per the current provisions of RTE Act, 2009, ensuring that no child is subjected to any kind of corporal punishment of any nature- physical or mental, To ensure ‘compulsory education’ for all children through availability of a neighbourhood school with proper infrastructure.last_img read more

Thai high in Delhi

first_imgA five-day event Thailand Trade Exhibition 2014 has been organised in the Capital by Department of International Trade Promotion Thailand (DITP) that started off on 3 September at DLF Place Saket. The show provides a trade opportunity for both the countries. The event was inaugurated by Chalit Manityakul Ambassador, Royal Thai Embassy. It showcases rich plethora of Thai activities and products like cultural dance, home decorative, gem and jewellery, educational toys, health and beauty and flowers.Chalit Manityakul said, ‘We are glad to organise this fair.as it has given us a great opportunity to showcase our exciting range of products to discerning buyers and sellers. With this platform, we hope to create more awareness amongst our target audiences and benefit from B2B interactions and meetings as well’.last_img read more