Backyard astronomer in Ireland finds supernova

first_img Exploding star in NGC 2397 Citation: Backyard astronomer in Ireland finds supernova (2010, October 8) retrieved 18 August 2019 from https://phys.org/news/2010-10-backyard-astronomer-ireland-supernova.html © 2010 PhysOrg.com Image: David Grennan/Astronomy forum. Astronomer David Grennan and his wife Carol were about to turn in from their garden shed observatory in Raheny in Dublin on 17th September when they discovered a supernova. The explosion that caused the burst of light occurred an estimated 290 million years ago. The discovery was confirmed officially by International astronomers earlier this week.Supernovae are stellar explosions that can outshine entire galaxies for a short time, and they are the major source of heavy elements in the Universe.Mr Grennan is a software developer by day, but at night he spends as much time as the Irish weather permits in his home-made observatory, which is a converted garden shed with a retractable roof. Grennan said he had been stargazing since he was about five years old, and had always been fascinated by the stars. He bought his first telescope in 1991, and has continually upgraded his equipment. In 2005 he built his home observatory using standard DIY parts. The observatory is equipped with a 14 inch Cassegrain telescope.David’s wife Carol analyzes the images he takes with his telescope and helps identify interesting objects. They discovered the supernova by comparing images of the galaxy UGC 112 taken in August and September. The signs were tiny, but David’s many years of experience helped him to spot them.David said the discovery was the result of a year’s work, during which he surveyed 2,611 galaxies. He said it was “mind-boggling” to be the first to see something that happened almost 300 million years ago, and the time-lag “is on a scale almost as difficult to comprehend as Ireland’s astronomical debt.” Carol was even more excited than he was, and the two shared a bottle of champagne when the supernova was confirmed. The supernova, named 2010 IK by official astronomy bodies, is the first to be discovered by someone in Ireland, but it is not Grennan’s first discovery. In 2008 he discovered a three-meter-wide asteroid (his second), which he named after his mother, Catherine Griffin, in honor of her encouragement of his stargazing hobby.Grennan, who was once chairman of Astronomy Ireland, said he would love to see young children becoming interested in astrophysics because “it’s amazing what you discover.”Supernovae are spotted regularly, but Professor Stephen Smartt of Queen’s University Belfast said it was unusual for astronomers in northern Europe to find one. He confirmed the finding was the first supernova to be discovered from Ireland.The supernova is expected to be visible with a powerful telescope for the next two or three months, after which it will fade from view.center_img 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. (PhysOrg.com) — An amateur astronomer working from his backyard shed in Ireland was the first in the world to spot a supernova explosion last month. The discovery is the biggest ever in amateur astronomy in Ireland. Explore furtherlast_img read more

New probe memory could achieve user densities over 10 terabits per square

first_img Perpendicular Magnetic Recording Beyond 1 Tbit/in2 Copyright 2010 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. More information: C.D. Wright, et al. “Write strategies for multiterabit per square inch scanned-probe phase-change memories.” Applied Physics Letters 97, 173104 (2010). DOI:10.1063/1.3506584 (PhysOrg.com) — Researchers have proposed a new strategy for writing data for scanned-probe memories with user densities that are potentially more than twice as high as those achieved with conventional approaches. While previous research has shown that scanned-probe memories have the potential to achieve storage densities of up to 4 Tbit/in2, the new study shows how the density could be increased to 10 Tbit/in2 or more. 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. Citation: New probe memory could achieve user densities over 10 terabits per square inch (2010, November 11) retrieved 18 August 2019 from https://phys.org/news/2010-11-probe-memory-user-densities-terabits.html The researchers, David Wright, et al., from the University of Exeter in Devon, England, and the IBM Zurich Research Laboratory in Rueschlikon, Switzerland, have published their study on the new write strategy in a recent issue of Applied Physics Letters. “We have shown that we can get ultra-high densities without the need for ultra-sharp tips,” Wright told PhysOrg.com. “Note that ‘conventional’ storage technologies like magnetic hard disk drives are currently ‘stuck’ at just under 1 Tbit/in2 densities and their road map does not predict reaching 10 Tbit/in2 until 2015 in the lab and 2020 for production.”As the researchers explain, the conventional method of writing for scanned-probe memories involves writing tiny marks with a probe, and recording the data in these marks. In this method, the tip size of the probe determines the size of the recorded mark, which limits the density. An alternative write strategy is mark-length recording, in which information is stored in the transitions between the marks rather than in the marks themselves. One of the advantages of mark-length recording is that it doesn’t rely as heavily on the sharpness of the probe tip as the conventional mark-position recording approach. “The key was realizing and demonstrating that continuous scanning (which is very bad for tip wear) is not needed to implement a mark-length scheme,” Wright explained.This is because mark-length recording can use one of the disadvantages of mark-position recording to its advantage: intersymbol interference. In the mark-position approach, bits written too close to each other can interfere with each other, so a minimum distance between bits is needed, which limits the achievable density. However, in mark-length recording, this interference can be exploited to merge marks together to make longer marks without the need for continuous tip scanning.Although mark-length recording has already been known to increase the storage density in traditional memory systems, such as magnetic and optical disk storage, scanned-probe memories have typically used only mark-position writing. Here, the researchers demonstrate how mark-length recording can be used in scanned-probe memories, as well. In the experiment, a voltage is applied between the probe tip and a phase-change medium, which heats and activates the phase-change layer. The medium can be read by sensing the change in electrical resistivity of the written medium. As the researchers explain, a direct comparison of the densities using these two approaches is not straightforward, but the new approach should increase the user density by at least 50%. By making further improvements, such as using sharper probe tips and ultrasmooth writing surfaces, the researchers predict that much higher densities can be achieved.The work is part of a large EU-funded project called Probe-based Terabyte Memories (ProTeM) (http://www.protem-fp6.org), which involves the development of scanned probe storage materials and techniques for ultra-high density, ultra-low power, small form-factor archival, and back-up memories. “Organizations and individuals are storing ever-increasing amounts of data and want to store it reliably, with low power consumption, and ideally in a small physical format,” Wright said. “The goal of our work is doing this with probe storage systems.” This image shows mark-length recorded bits with the corresponding current below. Image credit: Wright, et al. ©2010 American Institute of Physics.last_img read more

Potential drunk drivers now have an app for that

first_img(PhysOrg.com) — You have spent the night out on the town and had a few drinks with friends. At the end of the evening, you figure you have only had a few drinks. You should be fine to drive right? While this is something that is heard in many bars throughout the country, there is now a new app designed to help you determine if you are indeed sober enough to be driving. The new iPhone app, known as BreathalEyes, uses the iPhone camera to record and measure a person’s Horizontal Gaze Nystagmus (HGN). This HGN is the involuntary eye movement that can occur when a person is impaired by alcohol and is one of the many different field sobriety tests that are conducted by police officers. New mobile app, ShoeBox, helps scan old photos 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.center_img © 2011 PhysOrg.com Citation: Potential drunk drivers now have an app for that (2012, January 9) retrieved 18 August 2019 from https://phys.org/news/2012-01-potential-drunk-drivers-app.html By having a person look into the iPhone camera, the app is able to measure this movement in a 10 second test and then lets drivers know if they are under the influence.While this app is legally marketed for entertainments purposes only, it has been tested alongside a standard breathalyzer. The results show that the new app has an effective range of 0.02 – 0.18 percent and a (+/-) 0.02 percent accuracy of blood alcohol content, or BAC, levels.The disadvantage of this app is you cannot administer it to yourself. You will have to have a friend with a steady hand hold the camera. The test must also be conducted in good lighting so that leaves most bars or clubs out.Currently this app is only available for the iPhone 4 or later but the company has plans to have an Android app available within the year for the low cost of only $0.99.last_img read more

AIST group measures objects in 3D with camera projector w Video

first_imgvia Diginfo Sagawa foresees such a system as having use in research about using the body to control things like multimedia, virtual reality, and games. He also said that data obtained by this measurement method could be used to analyze how athletes move.” He can imagine the system being used to measure the movements of an athlete in the middle of a stadium, from a long way away, for example. If we can do that, we think this method would be great for making 3-D videos as well.”Actually, the possibilities may go beyond what they have already considered. “Currently, we’ve stopped at the stage of making measurements. But we’re also thinking about how to use the measured data. We’d like to work on applications to sports science and materials analysis.” Another possibility, as long as the patterns can be captured, is to apply the system to work with different devices, too. “We’d also like to keep increasing the range of things that can be measured.” Citation: AIST group measures objects in 3-D with camera, projector (w/ Video) (2012, August 16) retrieved 18 August 2019 from https://phys.org/news/2012-08-aist-group-d-camera-projector.html The team says the value of their method is that it can provide more measurement positions than conventional motion capture, and can be used in scenarios where shapes have been difficult to measure because they change too fast. They also say that their method is precise, with a tolerance of just 1-2 mm. Ryusuku Sagawa, service Robotics Research Group, Intelligent Systems Research Institute at AIST, presided over the camera and projector demo. “If you look carefully, you can see that each line is wavy. The wavy line patterns are carefully designed, so the pattern from the projector can be recognized from the camera image. This makes it possible to use the projector and the camera for triangulation, so we can know the shape at that instant.” 1ms pan-tilt camera system tracks the flying balls (w/ Video) Explore furthercenter_img (Phys.org) — Got camera? Got projector? Then you can measure objects in 3-D. A group at the Advanced Industrial Science and Technology Institute (AIST) has had no problem doing that. The researchers have demonstrated their method for measuring objects in 3-D, using only a camera and projector. Patterned light is projected on to the object and pattern images captured by the camera are processed to measure its 3-D shape. More information: © 2012 Phys.org 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

Study demonstrates evolution of stereotypes

first_img The research team led by Dr. Doug Martin of the Person Perception Lab at the University of Aberdeen used a technique they have used previously to study the evolution of language. They invented a series of aliens and randomly assigned them different colors, shapes and attributes such as selfishness, adventurousness, arrogance or trustfulness.A volunteer was then called in to learn about the aliens and memorize their personality traits and physical attributes. The volunteer then relayed this information to the researchers, who passed it on to the next volunteer, and so on down a communication chain. What they discovered was that stereotypes began to form almost immediately and particular shapes and colors became linked with personality traits. As it passed down the communication chain the information was unintentionally changed and simplified, and became more structured and thus easier to learn. Dr. Martin said the process seen in the research reflects the oversimplified nature of stereotypes, with social groups (and ourselves) categorized and assigned attributes, and he suggested that they form to help us make sense of the world around us and to give us some basic information as a starting point. The stereotype may turn out not to be applicable to a particular individual, but is nevertheless useful initially.Dr. Martin also pointed out that stereotypes are not fixed and do change over time. For example, a hundred years ago boys were traditionally dressed in pink, while blue was regarded as a “dainty” color more suitable for girls. Both genders wore dresses and played with dolls. The Person Perception Lab team studies many aspects of the transmission of information from person to person and the way in which the brain processes this information. Dr. Martin said their work on stereotypes could lead to being able to predict and even manipulate changes to stereotypes in the future, which could be of benefit to society.Dr. Martin presented his findings in a talk earlier this week at the British Science Festival, which is held in a different city each year. This year the Festival is being held in Aberdeen from 4-9 September. (Phys.org)—Researchers from Scotland suggest that stereotypes form and evolve over time through social transmission of information, similar to the way in which languages evolve. © 2012 Phys.org Citation: Study demonstrates evolution of stereotypes (2012, September 7) retrieved 18 August 2019 from https://phys.org/news/2012-09-evolution-stereotypes.html More information: www.britishscienceassociation. … tishsciencefestival/center_img Explore further More to facial perception than meets the eye 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

Tiny robot nanofish may one day deliver drugs inside the body

first_imgCredit: Small (2016). DOI: 10.1002/smll.201601846 Explore further Journal information: Small (Phys.org)—A combined team of researchers from the Harbin Institute of Technology in China and the University of California in the U.S. has developed a nano-sized, remotely controlled fish that is able to swim in liquids when a magnetic field is applied. The team has published the details of their research in the journal Nano Small Micro. Play Credit: Small (2016). DOI: 10.1002/smll.201601846 There are still some big issues to address with the tiny fish, the team acknowledges—one of which is how to rid the body of the swimmers after they have delivered their package. One solution they suggest is using material that at some point is biodegradable. There is also the cost—the amount of precious metals used to create a single fish would be small, but it could add up quickly if hundreds of the fish were used to deliver doses of medicines. Also, it would seem that a means for tracking the fish would have to be developed to allow for micro-steering. 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. 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 Play Credit: Small (2016). DOI: 10.1002/smll.201601846 center_img Video: Research is revealing more about what it takes to truly swim like a fish More information: Tianlong Li et al. Magnetically Propelled Fish-Like Nanoswimmers, Small (2016). DOI: 10.1002/smll.201601846AbstractThe swimming locomotion of fish involves a complex interplay between a deformable body and induced flow in the surrounding fluid. While innovative robotic devices, inspired by physicomechanical designs evolved in fish, have been created for underwater propulsion of large swimmers, scaling such powerful locomotion into micro-/nanoscale propulsion remains challenging. Here, a magnetically propelled fish-like artificial nanoswimmer is demonstrated that emulates the body and caudal fin propulsion swimming mechanism displayed by fish. To mimic the deformable fish body for periodic shape changes, template-electrosynthesized multisegment nanowire swimmers are used to construct the artificial nanofishes (diameter 200 nm; length 4.8 μm). The resulting nanofish consists a gold segment as the head, two nickel segments as the body, and one gold segment as the caudal fin, with three flexible porous silver hinges linking each segment. Under an oscillating magnetic field, the propulsive nickel elements bend the body and caudal fin periodically to generate travelling-wave motions with speeds exceeding 30 μm s−1. The propulsion dynamics is studied theoretically using the immersed boundary method. Such body-deformable nanofishes exhibit a high swimming efficiency and can serve as promising biomimetic nanorobotic devices for nanoscale biomedical applications. 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 Prior efforts to build extremely small bio-transport mechanisms have generally been based on the corkscrew-tailed model of bacteria, the researchers note, but they believed a better approach would be to mimic the way fish swim. To that end, they connected gold and nickel segments together with silver hinges—the outer segments made of gold serve as the head and tail, while the inner segments serve as the fish body. Each of the segments are just 800 nanometers in length and the complete fish is a hundred times smaller than a single grain of sand.The fish is caused to swim by applying an oscillating magnetic field that forces the head and tail to swing, which in turn propels the fish forward. The direction the fish takes and the speed at which it moves can be controlled by manipulating the position and speed of the oscillating magnet. The purpose of such nanoswimmers, the team proposes, is to carry medicine to a particular part of the body, thereby reducing the need for surgery or overuse of drugs that can cause negative side effects in other parts of the body. An accompanying video demonstrates not only the ease with which the fish can be controlled, but the speed at which they can travel—an obvious improvement over other nano-delivery systems. Citation: Tiny robot ‘nano-fish’ may one day deliver drugs inside the body (2016, September 12) retrieved 18 August 2019 from https://phys.org/news/2016-09-tiny-robot-fish-day-drugs.html © 2016 Phys.orglast_img read more

ACB to probe graft charges against its chief

first_imgAccording to sources, Delhi Chief Minister Arvind Kejriwal has directed Directorate of Vigilance, the administrative department of ACB, to take further action on a complaint of embezzlement of Rs 20 lakh against Meena lodged by a retired inspector of Delhi police on Thursday.In the complaint Meena has been accused of purchasing curtains and curtain rods during his tenure as Principal of Police Training College, Jharoda Kalan between May 11 and July 25, 2005. “The items were purchased without requirement, without approval from higher authorities and without tender. Three local suppliers were selected for tenders and payment was made on fake bills,” said  Jawahar Lal, the complainant. The complainant has also alleged that as the Principal, Meena did not have the power to purchase items worth over Rs 5,000, fake bills were created with amounts less than Rs 5,000. “The records indicate that the quotations were obtained from a single source and in a similar handwriting as if a single person supplied the material on the name of three different firms. Curtains were procured at an exorbitant price that too of inferior quality,” added Lal.Interestingly, the then Delhi Police Commissioner Y S Dadwal in 2008 had recommended ‘disciplinary action’ against Meena and also referred the matter to Delhi government for further probe and action but it was silently buried in 2011. “Disciplinary action will also have to be taken against Meena now posted as Additional CP (Security). We may make a reference in this regard to the Delhi government,” wrote Dadwal on January 15, 2008. According to sources former Delhi CP R K Paul had also recommended action against Meena but in 2011 then Chief Secretary of Delhi Government ordered not to proceed further into the matter.last_img read more

Court directs Babul Supriyo to retract defamatory statements against Abhishek

first_imgKolkata: The City Civil Court on Tuesday directed the Union Minister of State for Ministry of Heavy Industries and Public Enterprises, Babul Supriyo, to retract the defamatory statements that he made against TMC MP Abhishek Banerjee.It may be recalled that in November 2017, Supriyo had made the “malicious and defamatory” statements against Banerjee at a Press conference stating that the latter “illegitimately profiteered to the tune of Rs 17 to Rs 18 crore against smuggling of coal in Bengal.” It got published and circulated widely in different media and even on social networking sites. Also Read – Rain batters Kolkata, cripples normal lifeIt led to defamation of Banerjee and his counsels moved court in December 2017.The Third Bench of the City Civil Court had granted an interim order of injunction in this connection restraining Supriyo “not to make any derogatory comment or defamatory statement against Banerjee”. The Court on July 24 ordered Supriyo “to retract the defamatory statements made in November 2017 at the Press conference in Asansol against Abhishek Banerjee by sending a letter or otherwise within a fortnight from the date of the order.” Sanjay Basu, Advocate for Banerjee, said: “Babul Supriyo failed to produce any evidence in support of his defamatory statement and hence the Court passed the order of injunction and retraction in favour of Abhishek Banerjee. The falsity in Babul Supriyo’s statement has been exposed.”last_img read more

No toll tax for twowheeler riders on 2nd Hooghly Bridge

first_imgKolkata: The Mamata Banerjee government has decided to waive the toll tax for two-wheelers on Vidyasagar Setu.With the announcement of Chief Minister Mamata Banerjee in this regard, two-wheeler riders will not have to pay Rs 5 anymore to avail Vidyasagar Setu to travel across River Hooghly from October 1.While leaving Nabanna on Thursday, Banerjee said: “The toll tax for two-wheelers on Vidyasagar Setu has been waived. From October 1 onwards, riders of two-wheelers will not have to pay the same.” Also Read – Rain batters Kolkata, cripples normal lifeAround 3.11 crore vehicles pass through the bridge every year and it includes around 84 lakh to 90 lakh two-wheelers. The decision to waive the toll tax for the two-wheelers will cost Rs 5 crore to the state’s exchequer.It may be mentioned that there are separate lanes for two-wheelers at the toll plaza on Vidyasagar Setu. But during rush hours, there are long queues to pay thetoll tax. With this waiver, there will be no more queues of two-wheelers and it will help in bringing down the rate of pollution in the area. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedSecondly, many office-goers need to cross the bridge everyday and they will be tremendously benefitted due to this decision of the state government as they no will no longer have to pay Rs 5 each time — once while heading towards their office and again while returning home. It may be mentioned that the state Secretariat, Nabanna, is situated at a stone’s throw distance from the toll plaza. The decision has been welcomed by the people in general as they do not have to pay any amount to cross the bridge and also wait in queues during the office hours.It may be mentioned that only thetoll tax for two-wheelers has been waived while the same for other vehicles remain unchanged.last_img read more

Drinking is deadly for Hepatitis C patients

first_imgAlcohol use is especially detrimental to patients with Hepatitis C.The findings showed that people infected with Hepatitis C are three times more likely to drink five or more drinks per day everyday than those without Hepatitis C, lifetime abstainers or current non-excessive drinkers.“Alcohol promotes faster development of fibrosis and progression to cirrhosis in people living with Hepatitis C, making drinking a dangerous and often deadly activity,” said lead author Amber L. Taylor from the Centres for Disease Control and Prevention’s Division of Viral Hepatitis. Also Read – ‘Playing Jojo was emotionally exhausting’“In 2010, alcohol-related liver disease ranked third as a cause of death among people with Hepatitis C,” Tylor added in the paper published in the American Journal of Preventive Medicine.In order to better understand the link between alcohol use and Hepatitis C, investigators examined self-reported alcohol use.The team looked at Hepatitis C infection rates for four groups: lifetime abstainers, former drinkers, non-excessive current drinkers and excessive current drinkers. Also Read – Leslie doing new comedy special with NetflixPeople who participated and tested positive for Hepatitis C antibodies found that 50 per cent were unaware before being notified.“Half of all people living with Hepatitis C are not aware of their infection nor the serious medical risks they face when consuming alcohol,” Taylor stated. The new information provided by this study helps shed more light on the level of alcohol consumption among those living with Hepatitis C. It can help guide best practices for both treating patients and possible interventions.last_img read more