August, 2019 Archive
Chicago Installs Solar Powered Charging Station for Electric Vehicles Citation: Space-Based Solar Power Coming to California in 2016 (2009, April 15) retrieved 18 August 2019 from https://phys.org/news/2009-04-space-based-solar-power-california.html Solaren Corp., a solar power start-up, has convinced Pacific Gas & Electric (PG&E), California’s largest utility company, to purchase 200 megawatts of electricity when its system is in place, which is expected to be 2016. According to Solaren, the system could generate 1.2 to 4.8 gigawatts of power at a price comparable to that of other renewable energy sources.In Solaren’s proposal, solar power satellites would be positioned in stationary orbit about 22,000 miles above the equator. The satellites – whose arrays of mirrors could be several miles across – would collect the sun’s rays on photoelectric cells and convert them into radio waves. The radio waves would then be beamed to a receiving station on the ground, where they would be converted into electricity and delivered to PG&E’s power grid. Because the radio beam is spread out over a wide area, it would not be dangerous to people, airplanes, or wildlife.The plan requires a large area of land to host the ground receiving station’s antenna array, and several square miles of scrubland in western Fresno County could provide an ideal location. In addition to being sparsely populated, the region is also near transmission lines and a load center. While many of today’s land-based solar stations are located far out in the desert, a station closer to customers could offer greater convenience and economic advantages.Gary Spirnak, CEO of Solaren Corp. and a former aerospace engineer, noted that the project will cost more than $2 billion, mostly going toward engineering development and building of the ground station, as well as launching four or five satellites. So far, Solaren has raised an undisclosed sum from private investors.”While a system of this scale and exact configuration has not been built, the underlying technology is very mature and is based on communications satellite technology,” Spirnak said.Solaren’s project is not the only space-based solar system in the works; Japan’s space agency, JAXA, has recently begun testing a space-based solar array that beams energy to Earth in the form of microwaves. If the tests are successful, the agency plans to launch an array of satellites that would transmit power to a 1.8-mile-wide receiving station, which would generate enough electricity to power about half a million homes.More information: Q&A with Gary Spirnakvia: MSNBC and Fresno Bee© 2009 PhysOrg.com Explore further (PhysOrg.com) — In the near future, a solar power satellite may be supplying electricity to 250,000 homes around Fresno County, California. Unlike ground-based solar arrays, satellites would be unaffected by cloudy weather or night, and could generate power 24 hours a day. If successful and affordable, the project could mark the beginning of space-based solar power in other locations, as well. The microwave beam is targeted at a rectifying antenna array on Earth. Designers say the beam would have about one-sixth the intensity of noon sunlight. Image credit: Mafic Studios Inc. 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.
Citation: Head-up display wins top navigation prize in Munich (2011, October 27) retrieved 18 August 2019 from https://phys.org/news/2011-10-head-up-prize-munich.html The display carries virtual road signs to warn of conditions ahead. Attractions such as service stations and hotels are identified by virtual signs floating above them.The images appear to be outside the windshield from a distance of two meters to infinity. They are described as volumetric (“truly 3-D”) and they are capable of refreshing at a rate of 60 frames per second. The designers had pilot-level situational awareness in mind when working on the display design A no-need-to-think-about-it, realtime stream of information was the goal, yet it had to be cost-engineered for the car market, where drivers could see moving, not fixed, images, constantly refreshing. The system would have to be small, light and inexpensive enough to make its way into all cars. © 2011 PhysOrg.com “The world’s foremost automotive display researchers had essentially given up trying to push the size and cost of 3-D conformal HUDs down far enough to enter the automotive supply chain. We did not,” says a company spokesman.According to Making Virtual Solid, the technology requires a small hardware package, and can operate in bright sunlight,According to Inside GNSS, MVS-California has designs and manufacturing plans and is seeking ecosystem partners to build on its system’s potential use in automotive, trucking, marine, and avionics markets. 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. More information: galileo-masters.eu/index.php?k … anzeige=press47.htmlwww.mvs.net/technology.html#true3d The HUD system is described as an augmented reality navigational display engine designed to provide non-distracting, translucent location guidance. Images are projected directly onto the car’s windshield. “Non-distracting” and “translucent” are the strong attributes, as the company touts its system’s use of 3-D technology to beam the display across the entire front window of the car. With a less robust readout, that would be no better than a road map over glass, but “True3D” creates a readout that blends into what the driver sees on the road in front of the vehicle. A luminous, three-dimensional landscape over the real world delivers information that the driver needs without the driver having to look elsewhere than on the road, and it is less distracting too than a small rectangle nearby the windscreen wipers. Augmented reality windshield from GM to show drivers potential hazards (w/ Video) (PhysOrg.com) — A navigation system making use of something called “True3D” technology has won the top prize in this year’s European Satellite Navigation Competition in Munich, Germany. The ESNC is an international innovation contest that awards the best ideas for applications in satellite navigation. There were 401 proposals from almost 50 countries. The winner was selected by an international panel of experts. The company that designed the system, Making Virtual Solid (MVS-California), entered its True3D Head Up Display & Navigation System, which won the Galileo Master 2011 grand prize of 20,000 Euros.
More information: blogs.msdn.com/b/tzink/archive … -android-botnet.aspx (Phys.org) — A Microsoft engineer has spotted a botnet that targets Yahoo! Mail users using Android devices. Terry Zink , who also writes an Internet security blog, said he has evidence of a botnet running on Android devices where spam e-mail messages are being sent from Yahoo mail servers on Android devices, logging into Yahoo! mail accounts and sending off spam. Zink, embarking on a tracking expedition, reported how all the messages coming from compromised Yahoo! accounts and sent through Yahoo! Mail servers, seemed to finish with “Sent from Yahoo! Mail on Android” signatures. Image credit: Security Networks Explore further Zink was able to look up where the IPs were located: Chile, Indonesia, Lebanon, Oman, Philippines, Russia, Saudi Arabia, Thailand, Ukraine, and Venezuela. Zink’s theory is that the users of those phones had downloaded a malicious Android app in order to avoid paying for a legitimate version but they got more than they expected. “Either that or they acquired a rogue Yahoo Mail app,” he said.A botnet is a large number of compromised computers used to generate spam, and spread viruses. The spam samples he examined from compromised Yahoo accounts all had the Message-ID:Message-ID: 1341147286.19774.androidMobile@web140302.mail.bf1.yahoo.comHe also said they all had the same message at the bottom of their spam: “Sent from Yahoo! Mail on Android.”Android malware is a well-known fact of digital life, and last year security firms like McAfee spoke about sharp rises in Android malware. One reason given for Android’s vulnerability is that the platform simply provides, like Windows, a big marketplace and in turn serves as a big target for intruders. Like other security bloggers offering advice, where they suggest the user takes care to use trusted application stores and avoid unknown sources for apps, Zink said, “Your odds of downloading and installing a malicious Android app is pretty low if you get it from the Android Marketplace. But if you get it from some guy in a back alley on the Internet, the odds go way up.”Those minimizing the July 3 posting perhaps would not want to recall the news release one day earlier, on July 2, where Trend Micro said Android malware levels were rising at an alarming rate. In the first three months of the year the team identified 5,000 malicious applications designed to infect Android phones, a number which spiked more than fourfold over subsequent months. “Consumers need to use care when downloading and installing apps and should be considering installing antimalware on their mobile devices,” said the release.Last month, the Defense Advanced Research Projects Agency (DARPA) awarded a $21.4 million contract to security firm Invincea to build security Android devices for the U.S. Army. The contract focus is to be protection of the devices against cyber-threats. Citation: Microsoft engineer eyeballs Android botnet (2012, July 4) retrieved 18 August 2019 from https://phys.org/news/2012-07-microsoft-eyeballs-android-botnet.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. Android Trojan dubbed ‘Geinimi’ found in legitimate applications © 2012 Phys.org
Modern computers are based on transistors – electronic based circuits that use a small amount of electrical charge to create and hold one of two states – “on” or “off.” This approach has allowed for the development of a wide variety of computing devices, but it also has its limits. The more logic gates a circuit has, the more electricity it requires, which means more heat buildup. It also means that circuits must be hard-wired, which limits the types of functions to which they can be put. Because of that, computers wind up having several types of dedicated circuit boards in them to carry out different applications, e.g. video, audio, CPU, etc. In this new research, the team from Korea has built a circuit that is based on switchable magnetism, and as a result, suffers from neither limitation.To create the circuit, the researchers built a logic gate controlled by magnetism. In practice, it’s a two layer bridge made out of the semiconducting material indium antimonide. The bottom layer has positively charged holes, while the top has mostly negatively charged electrons. Sending a magnetic field across the bridge in one direction causes the electrons to pass over the bridge and on through the circuit, sending it in the other direction causes the electrons to stop when they bump into the lower layer. The result is a logic gate that allows or disallows current to pass through – one state can be considered “on,” the other “off” representing “1” or “0.” And because the state of the logic gate is controlled by magnetism, it can be held in place in the absence of electricity. That means less heat and more importantly, an ability to program circuitry like software. A computer based on such logic gates would only need one circuit board – it could be reconfigured on the fly to carry out whatever purpose is needed, whenever that need comes about.There are still some serious issues to be addressed, of course, before such circuits could be used in real applications however, such as how to integrate them with silicon based technology – and perhaps more importantly how to control thousands or even millions of tiny magnets in a practical way in a computing device. More information: Magnetic-field-controlled reconfigurable semiconductor logic, Nature (2013) doi:10.1038/nature11817AbstractLogic devices based on magnetism show promise for increasing computational efficiency while decreasing consumed power. They offer zero quiescent power and yet combine novel functions such as programmable logic operation and non-volatile built-in memory. However, practical efforts to adapt a magnetic device to logic suffer from a low signal-to-noise ratio and other performance attributes that are not adequate for logic gates. Rather than exploiting magnetoresistive effects that result from spin-dependent transport of carriers, we have approached the development of a magnetic logic device in a different way: we use the phenomenon of large magnetoresistance found in non-magnetic semiconductors in high electric fields. Here we report a device showing a strong diode characteristic that is highly sensitive to both the sign and the magnitude of an external magnetic field, offering a reversible change between two different characteristic states by the application of a magnetic field. This feature results from magnetic control of carrier generation8 and recombination in an InSb p–n bilayer channel9. Simple circuits combining such elementary devices are fabricated and tested, and Boolean logic functions including AND, OR, NAND and NOR are performed. They are programmed dynamically by external electric or magnetic signals, demonstrating magnetic-field-controlled semiconductor reconfigurable logic at room temperature. This magnetic technology permits a new kind of spintronic device, characterized as a current switch rather than a voltage switch, and provides a simple and compact platform for non-volatile reconfigurable logic devices. Magnetoconductance tunable by external voltage. Credit: (c) Nature (2013) doi:10.1038/nature11817 Explore further (Phys.org)—A team of scientists from several research centers in South Korea, has succeeded in building a logic circuit that is based on switchable magnetism, rather than electronics. They describe their research and a prototype they’ve built in a paper they’ve had published in the journal Nature. © 2013 Phys.org Journal information: Nature Researchers develop better control for DNA-based computations Citation: Researchers build switchable magnetic logic gate (2013, January 31) retrieved 18 August 2019 from https://phys.org/news/2013-01-switchable-magnetic-logic-gate.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.
More information: Alex Teachey et al. Loose Ends for the Exomoon Candidate Host Kepler-1625b. arXiv:1904.11896 [astro-ph.EP] arxiv.org/abs/1904.11896Laura Kreidberg et al. No Evidence for Lunar Transit in New Analysis of HST Observations of the Kepler-1625 System. arXiv:1904.10618 [astro-ph.EP]. arxiv.org/abs/1904.10618 René Heller et al. An alternative interpretation of the exomoon candidate signal in the combined Kepler and Hubble data of Kepler-1625, Astronomy & Astrophysics (2019). DOI: 10.1051/0004-6361/201834913 Unconfirmed exomoon could be unlike any of those in our solar system Citation: Two studies cast doubt on existence of exomoon (2019, May 6) retrieved 18 August 2019 from https://phys.org/news/2019-05-exomoon.html Two teams working independently have looked at the possibility of an exomoon circling the exoplanet Kepler-1625b, which orbits the star Kepler-1625. They report little to no evidence supporting its existence. One team, led by Laura Kreidberg, has written a paper describing their work, which is posted on the arXiv preprint server. Another team led by René Heller published a paper in the journal Astronomy Astrophysics. The team that announced possible evidence of the exomoon last year, led by Alex Teachey, has written another paper in response to the findings by the new researchers that is available on arXiv. © 2019 Science X Network Explore further Journal information: Astronomy & Astrophysics 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 October, Teachey and colleagues published a paper describing evidence they had found for the possible existence of an exomoon. They had noted dips of light from its star recorded by the Kepler space telescope that suggested a large body circling Kepler-1625b. They found the same sort of dip in Hubble data. Such dips are generally indicative of a planet or other object interfering with light from its star as it passes in front of it—in this case, Kepler-1625. They also noted that Kepler-1625b had what appeared to be an odd transit—it began earlier than it should have and the dip in brightness that resulted did not return to normal for a period longer than calculations suggested it should have, comprising more evidence of an exomoon.The team led by Kreidberg analyzed the Hubble data using a different data-processing technique that has been used successfully for over seven years. They report no evidence of a dip other than that triggered by Kepler-1625b. The team led by Heller did observe a slight dip, but suggests it was not sufficient evidence of an exomoon. Both teams also saw the odd transit, but both suggest it could have been due to other phenomena, so attributing it to an exomoon was not warranted.In their reply, Teachey and his team took another look at their earlier results and suggest they warrant further observations of Kepler-1625b for more evidence. They also addressed the findings of Kreidberg’s team and noted that the technique used by the group could have resulted in some data being erased. Credit: CC0 Public Domain
In her exhibition titled Traditional Beats, Anuradha Thakur depicts the life and culture of tribal communities across India through her paintings. They portray tribal culture rooted in tradition and tribal life ever blossoming in accordance with the realities of existence.’The selection of paintings in the my collection focuses on rituals that create bonding, whether it be for newly-weds or for the community. Rituals, formal or informal, generate togetherness. The textures, patterns, forms, shapes and hues represent the regional flavour of traditional art from different areas of India and their combination is such that the rawness and dignity of tribal life are juxtaposed to create a spontaneous pleasing expression,’ said Thakur. Also Read – ‘Playing Jojo was emotionally exhausting’Thakur’s signature style is the use of black and white that defines strength complemented by earthen colours. The colour Black represents strength and sense of community that the people enhance by holding on to tradition and the earthen hues reflect the diversity of individual experience and expression. The use of black is generally considered to be heavy and hard and difficult to balance, but Anuradha effortlessly renders a lightness and grace, just as she does with the peculiarity of dance forms, the footwork, the costumes, the hairdos, the prints, decorations, ornaments and musical instruments. Also Read – Leslie doing new comedy special with NetflixHer earlier 11 collections were Autumn Harmony, Music of Life – Kutch, Colours of Life – North-East, Festive Rhythm – Jhabua, Songs of Nature – Nature, Earthen Harmony – Colour painting of Tribal Life, Ethereal Accords – Abstract, Transcending Rhythm – Maharashtra Managalagauri, Ethereal Rhythm – Abstract, Rhythm of the Seasons – Traditional Dances and Serene Harmony – Rajasthan.Anuradha has been awarded the All India Lokmanya Tilak Award at Pune. She has held 12 solo shows and 14 group shows in Mumbai, Pune, Bangalore, Hyderabad, Ahmedabad, Goa, Jaipur and Sofia( Bulgaria). Traditional Beats being her 13th.DETAILAt: Gallery No-6, Lalit Kala Akademi, Mandi House When: 8 -15 NovemberTimings: 11 am – 8 pm
Exploring the unexplored. That is the motto of this exhibition that starts at the Lalit Kala Academy today. The works on display are by the two masters of modern Indian art – Nandalal Bose and Benodebehari Mukherjee – who need no introduction for art lovers.The current issue of ArtVarta (a bi-annual magazine by Akar Prakar gallery), which is on contemporary photography in India, Pakistan and Bangladesh put together by Ina Puri, will also be launched at the exhibition. Also Read – ‘Playing Jojo was emotionally exhausting’‘The aim was to look for works which we haven’t seen before. I had decided we will not take works from any institution like Lalit Kala Academy or National Gallery of Modern Art and the others,’ said curator Debdutta Gupta. Another interesting aspect of the exhibition, Works by Nandalal Bose and Benodebehari Mukherjee, is that it will showcase textile designs by Mukherjee and his works from his days as a student in Kala Bhavan, Santiniketan. The exhibition, by Kolkata-based gallery Akar Prakar, had earlier received much appreciation when it took place in Kolkata. Also Read – Leslie doing new comedy special with NetflixThere are more than 190 works on display and about a 100 odd are on sale. ‘You can actually own a work by the masters within Rs 50,000,’ said Reena Lath, director, Akar Prakar. The exhibition also puts emphasis on letters by Nandalal Bose. Whenever Bose wrote a letter to a friend or relative or simply sent a postcard, he drew on it. One side of the letter contained words and the other side almost inevitably contained his drawings.All his works are an expression of his life experiences captured through the strokes of his pen. The postcards are drawn with subjects of mundane, everyday concerns. He drew about man and nature, little details of everyday living. On one of the postcards, which he drew while his stay at Hazaribagh (the letter was written to his son-in-law Santosh Kumar Bhanja). Here he captured the lives of the local potters in pen and ink; how they burnt the clay, what their furnace looked like and how the women carried earthen pots on their heads formed subjects of this letter. Bose observed certain technologies very minutely. Interestingly, he applied the knowledge that he gathered from this to his art. For example, he saw a device called a chumbu used for applying mehendi. He filled colours in such a chumbu and used them for drawing mountains. As a result of this experiment, the picture gained a relief-like effect. In later years, he introduced the technique of drawing with this device to his students at Santiniketan. Mukherjee was one of them. The works on display here will be the ones using water colour, wash technique, pen and ink, calligraphy, textile design, printmaking, lithograph and ink and brush. They have been sourced from private collections and families and friends of the artists.An untitled work by Bose (which he had sent to Abanindranth Tagore in Puri) shows a crow and a mouse. Bose did this in the Mughal miniature format using wash technique. Another by Mukherjee has Bijoya greetings on one side and the opposite is splashed with black ink. In the middle there are three leaves of the Nayantara flower found in abundance in Santiniketan. He drew this when he was already becoming blind.‘It shows how he translated his sorrow of visual impairment into the language of art,’ said curator Gupta. We think this one is worth a dekko.DETAILAt: Lalit Kala Academy, Rabindra Bhavan, 35, Feroze Shah Road When: 11 to 17 December
‘We do not believe in conservation,’ rues photographer Nemai Ghosh. And Ghosh has reasons to be upset because his photographs are not mere prints, they are chronicles of the history of Indian cinema. ‘This is national treasure but no one has bothered to preserve it for future generations to see,’ he regrets. From being the only photographer the iconic Satyajit Ray allowed on his sets to taking pictures on the sets of other stalwarts of Indian cinema like Mrinal Sen, Ritwik Ghatak and MS Satyu, Ghosh can claim to have seen Indian cinema at close quarters — like few others have. Also Read – ‘Playing Jojo was emotionally exhausting’And yet in a year when Indian cinema celebrates its centenary year, not too many efforts have been made to bring the works to the limelight and let the cinema enthusiasts get a glimpse of the rich history of Indian films. Neither the film industry nor the government came forward to preserve his photographs for posterity. ‘No government did anything. Neither the central government nor the state government,’ said a visibly upset Ghosh.Famously called Satyajit Ray’s photographer, Ghosh’s works would have laid in a corner of his Calcutta house, all but forgotten, but thanks to a Delhi-based gallery, they are now up for view in the Capital. Ghosh has given the gallery 1 lakh 20 thousand negatives at ‘cost price’. Of the humongous collection, about 208 are on display, informs curator Pramod Kumar KG. ‘It took three years just to catalogue the collection. We tried to focus on Ghosh the photographer rather than Ghosh as Ray’s photographer. The aim was to showcase his photographic genius,’ said Pramod. Also Read – Leslie doing new comedy special with NetflixThis though, isn’t the first exhibition of Ghosh’s works. His photographs have been exhibited at the Cannes Film Festival, in Paris, London and Brussels internationally and also in Delhi and Calcutta. ‘Manjit Bawa had organised an exhibition in Delhi,’ informs Ghosh. The photographs on display have images captured on the sets of various movies and otherwise. From Naseeruddin Shah to Smita Patil, Simi Garewal, Om Puri, Utpal Dutt, Soumitra Chatterjee, Moon Moon Sen, Jaya Bachchan, Sharmila Tagore, Rati Agnihotri, Sunny Deol — they are all there. One aspect of Ghosh’s photographs is that he does not use the flash. His use of natural light was greatly influenced by the legendary lighting expert in Bengali theatre — Tapas Sen. Some of the photographs stay with you. Like one of Sharmila Tagore in her stylish best, with curlers in her hair, head wrapped in a scarf, on location in the forests of Palamu during Aranyer Din Ratri. Or another of Dharmendra and Moushumi Chatterjee playing badminton on the sets of a movie. Then there is one of Ray at the Shore Temple beach on the outskirts of Chennai during the shooting of the documentary Bala. And another of Jaya Bachchan and husband Amitabh sharing a joke — much before attaining superstardom.Did he ever face any difficulty in shooting the stars? Never, contends Ghosh. ‘I always used to take candid shots. Every person has a good angle. It is for me to find that out,’ he says. His favourites in terms of photographs? Jaya Bachchan, Soumitra Chatterjee and Bengali superstar Uttam Kumar. Catch the exhibition to find the history of Indian cinema unveil before you. Because it’s worth it!DETAILAt: Delhi Art Gallery, 11, Hauz Ghas VillageOn Till: 28 January Phone: 4600 5300
Kolkata: Police arrested a middle-aged man from Bally in Howrah on charges of cheating people for assuring them of getting loans from nationalised banks within just four days.Police said the person, Soumen Bagchi, is being remanded to police custody till May 5 after he was produced before a city court.It was in the first week of April, when one Kartik Chandra Dey had lodged a complaint with the Burabazar police station alleging that Rs 30,000 was withdrawn from his bank account in Burabazar branch of a nationalised bank. Also Read – Heavy rain hits traffic, flightsPolice initiated a probe and came to know from the complainant that he had got a cell phone number from an advertisement near Sealdah Station. It was stated in the advertisement that it would be possible to ensure a loan from nationalized bank within four days. He was in a desperate need for money and dialed the number.He was directed to keep photocopies of his PAN card, voter’s identity card and two blank cheques ready at home and a representative will visit his house to collect the same. Next day, a youth went to his house and asked him to sign a loan application and collected the other related documents. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedThe next day Dey found that Rs 30,000 was withdrawn from his bank account and he lodged a complaint with the police.Based on the allegation, a woman civil volunteer contacted the person posing as a person who needs a loan and finally reached the prime accused, Bagchi. Police had followed a youth, who had collected the documents from the woman civil volunteer, who went to Bally in Howrah to handover the documents to Bagchi. Investigation revealed that Bagchi used to recruit unemployed youth assuring a monthly salary of Rs 9,000. He used to send the same youth to withdraw the money using cheques with forged signatures done by Bagchi.