Robot uses supersonic air jets to climb on walls and ceilings w

first_img Citation: Robot uses supersonic air jets to climb on walls and ceilings (w/ video) (2011, May 24) retrieved 18 August 2019 from https://phys.org/news/2011-05-robot-supersonic-air-jets-climb.html (PhysOrg.com) — Instead of using sticky footpads to climb on walls and ceilings, a new robot takes advantage of fast-moving air that can generate an adhesion force on just about any kind of surface. The robot’s grippers, which don’t ever actually touch the surface as the robot climbs, operate on Bernoulli’s principle of fluid dynamics. Da Vinci surgical robot makes a tiny paper airplane More information: IEEE Spectrum The robot was developed by researchers at the University of Canterbury in New Zealand, with the results published in a recent ICRA paper by Matthew Journee, et al. According to Bernoulli’s principle, when a fluid (such as air) moves faster, its pressure decreases. To generate extremely fast-moving air, the researchers designed round grippers with tiny 25-μm gaps around the rim, out of which high-speed air can be forced. This design can compress the airflow so much that the air reaches supersonic speeds of Mach 3. The fast-moving air creates a low-pressure vortex inside the grippers that’s strong enough to pull the robot toward nearby surfaces, such as walls and ceilings, without actually touching them. The robot can roll on its two wheels, but the grippers are separated from the surface by a small gap. Explore furtherlast_img read more

Physicists demonstrate rotated light images

first_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. Play Image rotation filmed for a light beam propagating through a 10cm length of ruby rod, spinning the rod first clockwise and then anti-clockwise (as viewed from the camera position). Video: Science, DOI: 10.1126/science.1203984 To test this theory, the team created a square beam of green light, which they then directed at a spinning cylinder made entirely of ruby. The light was sufficiently strong enough to shine all the way through the cylinder, creating a square image on the other side. To see if the image was being rotated as the cylinder spun, the exact location of the projected image was noted, then the cylinder was spun in the opposite direction, to see if it would then be in a different position; which of course, it was. With the cylinder spinning at 30 revolutions per second, they found that the projected image was rotated about a third of a degree. They also found that increasing the amount of light tended to increase the amount of rotation of the projected image, in some cases, by as much as ten degrees.The research team note in their paper that they believe one application of this phenomenon could be its use in image encoding, just as current methods now include an image’s intensity. Scientists drag light by slowing it to speed of sound (PhysOrg.com) — In what might at first seem obvious, but isn’t after further thinking, a group of physicists from the United States and Canada have demonstrated, for the first time, that images generated by light, can be rotated via a rotating medium. In a paper published in Science, physicists Sonja Franke-Arnold, Graham Gibson, Robert W. Boyd and Miles J. Padgett describe how they were able to replicate the effects of light shifting via a moving medium, in a spinning medium, opening the door to a possible new way of encoding transmitted images. Explore further Scientists have long known that when a light is shone through certain moving material, that the light itself can be shifted along with it, due to the photons being absorbed and then released by the atoms in the medium. The effect has been demonstrated over the years and can be seen in the simplest of venues, such as light shining through a waterfall. Until now however, no one has shown that a similar effect might apply to a rotating medium.The idea is that if a beam of light, projected in a certain shape, such as a square for example, were to be shone through a spinning medium, such as a round block of glass, the image would emerge on the other side, but not exactly opposite; it would be off, just a little bit, in the direction of the spin. The amount of shifting would of course depend on both the speed of revolution of the cylinder and on the medium used, as some, such as rubies are able to cause more of a drag, per se, on the light as it moves through, than others.center_img More information: Rotary Photon Drag Enhanced by a Slow-Light Medium, Science 1 July 2011: Vol. 333 no. 6038 pp. 65-67 DOI: 10.1126/science.1203984ABSTRACTTransmission through a spinning window slightly rotates the polarization of the light, typically by a microradian. It has been predicted that the same mechanism should also rotate an image. Because this rotary photon drag has a contribution that is inversely proportional to the group velocity, the image rotation is expected to increase in a slow-light medium. Using a ruby window under conditions for coherent population oscillations, we induced an effective group index of about 1 million. The resulting rotation angle was large enough to be observed by the eye. This result shows that rotary photon drag applies to images as well as polarization. The possibility of switching between different rotation states may offer new opportunities for controlled image coding.via PhysicsWorld Citation: Physicists demonstrate rotated light images (2011, July 6) retrieved 18 August 2019 from https://phys.org/news/2011-07-physicists-rotated-images.html © 2010 PhysOrg.com 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 fullscreenlast_img read more

Android apps are full of potential leaks finds study

first_imgCredit: Sascha Fahl, et al. (Phys.org)—Many Android apps are capable of falling victim to Man in the Middle (MITM) attacks. How many? Far too many. Thousands of apps in the Google Play mobile market present vulnerabilities because of the way that protocols are implemented—namely, the Secure Sockets Layer (SSL) and Transport Layer Security (TLS). That Android apps are open to malware by now is a yawn-evoking statement if there ever was one, but a new paper provides findings that are making this week’s headlines. Computer science researchers from Philipps University of Marburg and Leibniz University of Hannover in Germany showed that Android apps that are used by over 180 million people can expose banking, social networking and email information. Citation: Android apps are full of potential leaks, finds study (2012, October 22) retrieved 18 August 2019 from https://phys.org/news/2012-10-android-apps-full-potential-leaks.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. Android users get malware with their apps More information: Research paper: www2.dcsec.uni-hannover.de/fil … android/p50-fahl.pdfVia Arstechnica © 2012 Phys.org They identified 41 apps available on the Google Play mart that leak sensitive information in traveling between smartphones and servers. The researchers used a smartphone with Android 4.0 Ice Cream Sandwich in their investigations. They installed potentially vulnerable apps on the phone and set up a WiFi access point with a Man in the Middle (MITM) SSL proxy. They equipped the SSL proxy with a self-signed certificate or with one that was signed by a trusted CA, but for an unrelated host name. Of the 100 apps selected for manual audit, 41 apps proved to have exploitable vulnerabilities. They captured credentials for numerous major services. “Furthermore, Facebook, email and cloud storage credentials and messages were leaked, access to IP cameras was gained and control channels for apps and remote servers could be subverted.”Their paper, testily called “Why Eve and Mallory Love Android: An Analysis of Android SSL (In)Security,” discovered the apps that have SSL code that either accepts all certificates or all hostnames for a certificate and thus are potentially vulnerable to MITM attacks.What also troubled the authors was the inability of many people in their survey to even recognize security threats attached to applications. “The results of our online survey with 754 participants showed that there is some confusion among Android users as to which security indicators are indicative of a secure connection, and about half of the participants could not judge the security state of a browser session correctly,” they said.Regarding secure connections, the researchers found that 47.5% of non-IT experts believed to be using a secure connection while the survey was served over HTTP. In addition, 34.7% of participants with prior IT education thought that they were using a secure channel when they were not. Only 58.9% of experts and 44.3% of non-experts correctly identified that they were using a secure or insecure connection when prompted.In summing up, the authors pointed to a need for more education and easier tools that can enable the secure development of Android apps. They also called attention to the need for research to identify which countermeasures can ensure the right mix of usability, security benefits and economic incentives for large-scale deployment.Android by the numbers merits that kind of care. Android is the most used smartphone operating system in the world. Building on the contributions of the open-source Linux community and more than 300 hardware, software, and carrier partners, Android has become the fastest-growing mobile operating system. The numbers keep shifting, but Android’s market share currently stays over 50 percent. Android users download more than 1.5 billion apps and games from Google Play each month, and the number is growing.last_img read more

3D Capture with iPad brought to you by Structure Sensor

first_img © 2013 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. The device has its own onboard power supply that provides up to four hours of active use.Included demo applications for funders of the Structure Sensor include a 3D scanning app, an interior mapping app, and a virtual pet app that can move around and behind real-world objects. The object scanner allows for the capture of models of objects which the user can export to CAD software or for 3D printing, and one can also upload models directly to Shapeways.com for 3D printing. The room-capture app, “Fetch,” where a virtual pet can play fetch with the user in the real world environment and “Ball Physics,” where virtual balls can interact with real-world geometry, round out the package.Occipital, the company behind Structure Sensor, is a 13-person startup based in Boulder, Colorado and San Francisco. Though already an established business that specializes in computer vision applications for mobile platforms, the team advantage in taking the crowdfunding route is that the team is to get sensors into the hands of early adopters and developers as soon as possible, They look forward to building “buzz among developers” and assessing demand. A demo of an augmented reality pet playing fetch At the time of this writing, it is clear that building buzz should be no problem. They already have sped past their $100,000 goal with pledges of $235,154 and 44 days still left to go. The $329 earlybird special-offer items are now all gone and the next price up is $349 for a device with “everything you need to use and develop with an iPad” plus a choice of iPad bracket, with estimated delivery of February. More information: www.kickstarter.com/projects/o … ture-the-world-in-3d Explore furthercenter_img Citation: 3D Capture with iPad brought to you by Structure Sensor (2013, September 18) retrieved 18 August 2019 from https://phys.org/news/2013-09-3d-capture-ipad-brought-sensor.html The iPad (4th generation) is officially supported and the plan is to officially support future iPad and iPad mini models with corresponding brackets once they are released. Developers would be building with Xcode, the Integrated Development Environment with Apple tools for developing software. The Structure Sensor is designed to work with the Apple Lightning connector. Once connected, the Structure’s own infrared sensor and camera for depth perception go to work with the iPad.Developers who do not work with Apple technologies are told that they can also try using Structure Sensor via a USB Hacker Cable, as the team built “hackability” in its DNA. As for the SDK kit, four screw holes on the bottom allow the non-Apple developers to mount to almost anything. The team is prepared to provide open CAD models for creating custom brackets. With the Hacker Cable one can connect to almost any platform that supports USB, according to the team. They are also prepared to provide open source drivers for multiple platforms including Windows, Android, OS X, and Linux. The aluminum Structure Sensor is available in: Ice Blue and Silver; the choice of aluminum allows for a thermal core that keeps the precision optics inside at an optimal temperature. The chemically hardened glass surface at the top, says the team, optimizes the depth image quality while protecting the infrared emitter and camera inside. Microsoft to add Kinect Fusion to Kinect for Windows SDK (Phys.org) —A sensor for capturing the world in three dimensions is coming to the iPad. A Kickstarter project that launched on Tuesday seeks funds for its Structure Sensor, which is a portable sensor that clamps on to the back of the iPad for 3D on the go. The device, says its creators at Occipital, is the first 3D sensor designed to work with mobile devices. The device is to ship February. With Structure Sensor, the user can capture models of rooms or play augmented reality games. The creators gave it a mobile range that begins at 40 centimeters and stretches to over 3.5 meters. The device can capture anything, they said, from teddy bear to an entire room. Developers are encouraged to take advantage of Structure Sensor for building mobile applications that interact with the 3D geometry of the real world.last_img read more

Best face forward

first_imgIt doesn’t take much to look good but one needs to know what features of your face can be hidden or highlighted to give that final stunning effect. Makeup Expert Ishika Tanej, tells you what to do and what not to – depending on your face shape. Oval Shape – As this shape is well-balanced, just use blusher and highlighter to enhance the features.Blusher – Apply the blusher to the ‘apple of the cheeks’ and along the cheekbones.Highlighter – Blend a highlighter above the cheekbone near the outer corner of the eye. Also Read – ‘Playing Jojo was emotionally exhausting’Round Shape – Adding length to the face and slenderising the jawline is required for the round face.Shading – Suck in your cheeks and see where the hollows appear. To slenderize the face, sweep the darker shade of powder into the hollows and down to the chin line.   Blusher – To slenderise the face, apply blusher slightly under the cheekbones and blends towards the ear. This will make the cheeks more defined. To add an illusion of length, apply a bit of blush to your chin and blend well. Also Read – Leslie doing new comedy special with NetflixLong/ Oblong Shape – To reduce the length of the face, an illusion of width is required for a long face.Shading – To shorten the face, apply a deeper shade of foundation across the jaw and chin and on the top of the forehead. Apply a little bronzer on the chin and blend well.Blusher – Apply extra blusher on the apple of the cheeks to bring out the cheekbones.Square Shape – Softening the wide corners of the face and adding an illusion of length is required for square face. Shaping – To soften the square angle of the face, sweep the darker shade along the outer edge of the jaw to under the ear. To soften the forehead, shade around the hairline at the upper corners of the square.Blusher – Keep blusher light and soft – you don’t need hard definition. Place the blusher on the ‘apple of the cheek’ and blend softly out towards the hairline, following the cheekbone – this will soften the face and make it appear more oval.Rectangular Shape – Cutting extra width from all corners of the face and make it appear more oval is what you should aim for. Shading  – By using  a darker shade of the foundation cut the edges on the forehead and jawline. Blusher – Apply the blusher on the apple of your cheeks towards the hairline in a straight sweep. Heart-shaped – Narrowing the width of the forehead and adding width to the chin and jaw line are required for a heart-shaped face.Shading – Shade the face at the temples to narrow the top part of the face. Avoid any shading in the hollows of the cheeks or the lower part of the face.Blusher – Apply the blusher to the apples of the cheeks – this will bring the focus up to the centre of the face, away from the chin.Highlighter – Apply the highlighter to the chin and around the jawbone – this will help to balance the face.   Inverted – Triangle Shape – Giving an illusion of length and adding width to the forehead are required for a triangular face.  Shading – A deep colour foundation should be applied on the sides to minimise the width of the jaw and to achieve a slender look,Blusher – Apply blusher to the cheekbones and blend towards the jaw line.Pear Shape – Here we aim at making small forehead appear broader and giving more oval look to the face. Shading – Use a darker shade of foundation to cut width from your jawline. On forehead, apply a lighter shade on the edges to add width. Blusher – Add volume to your cheeks by applying blusher on your cheeks that matches your skin tone with an angular sweep.last_img read more

The power of peaceful atom

first_imgTitled, Anushakti Atma the exhibition is set up by State Atomic Energy Corporation of Russia – Rosatom and the Rossotrudnichestvo Mission.The exhibition consists of four blocks telling about the nuclear power plant at Kudankulam Site, Rosatom international experience, describing elements of the NPP and stages of NPP construction, the fields of the nuclear technologies application. Exposition will also provide the information on the contribution the NPP makes to the environmental protection. Special emphasis is made on the photographs from the recent torch relay on the North Pole.The photos demonstrate the positive influence of the environment friendly nuclear technologies. The special serial of photos is dedicated to the construction of the Kudankulam NPP – a key project of the Russian-Indian cooperation which will soon start generating electricity for the South Indian region.When: Till 6 DecemberWhere: Russian Centre of Science and Culturelast_img read more

Water to be released from Tenughat dam only after green signal from

first_imgKolkata: Damodar Valley Corporation (DVC) chairman P K Mukhopadhyay assured on Thursday that water will be released from Tenughat dam in Jharkhand, only after consultation with Damodar Valley River Regulation Committee (DVRRC), which looks after water discharge.Making it clear that DVC has been maintaining very good relations with the Bengal government, Mukhopadhyay said that talks have already been held with the officials of the state Irrigation department and another meeting is scheduled to be held very soon, to ensure that Bengal is not inconvenienced by any means due to release of water from Tenughat dam in the monsoon season. Also Read – Heavy rain hits traffic, flightsIt may be mentioned that Chief Minister Mamata Banerjee and state Irrigation minister Rajib Banerjee has alleged time and again that DVC officials did not inform the government before releasing water from the dams, resulting in flood-like situation in a number of districts in Bengal.”If we are informed some time before the release, then we can make arrangements to shift the people from vulnerable areas,” an official in the state Irrigation department said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedResponding to a poser on the blame game between state government and DVC, Bandyopadhyay said, “I am not aware of any such things in the recent past. We maintain a very cordial relationship and we are hopeful that there will be absolutely no problem in this regard this year.”It may be mentioned that there is a committee comprising representatives of DVC, Central Water Commission and governments of Bengal and Jharkhand. “We usually provide updates on release of water from different dams to the committee every three hours,” a DVC official said.It may be mentioned that in July 2017, several areas of Bankura, West Midnapore and Hooghly were flooded due to alleged indiscriminate release of water by DVC. The situation had reached such a flashpoint that state Chief Secretary Malay De had to speak to his Jharkhand counterpart Raj Bala Verma and request her to maintain a check on the release of water.last_img read more

Over 5000 people left stranded on JammuSrinagar highway

first_img“More than 5,000 people are stranded at various places on the national highway,” an officer at the traffic control room Ramban told a news agency.The traffic police officials say that more than 2,000 vehicles, most of them passenger vehicles, continue to be stranded on the 300-km long national highway.”More than 2,000 vehicles continue to remain stranded on the highway more than half of them are passenger vehicles,” SSP Traffic (National Highway) Sanjay Kotwal said.Even as the weather conditions across the state have improved, it might take a while to throw the highway open for vehicular traffic.”The highway has suffered a lot of damage due to massive landslides that were triggered by heavy rain and snowfall. It might take some more time to throw the road open,” the officer said.Various stranded passengers said that they were facing hardships as the authorities, they say, have failed to help them.  “We don’t have anything to eat or drink, the administration has completely failed to help us. The children are without milk, we pray that the highway opens soon so that we can reach our destination,” said Khursheed Ahmed, one of the stranded passengers.Minister, 5 MLAs airlifted due to Highway closure Minister of State for Public Works Department Sunil Sharma and five MLAs stranded at various places due to closure of Jammu-Srinagar Highway, were airlifted here to take part in oath ceremony.”Minister and five other MLAs were airlifted in a chopper from different places to Jammu on Tuesday. They were stranded at different places due to closure of highway,” DIG Doda-Kishtwar range, Nissar Ahmed told a news agency. Others included Doda MLA Shakti Parihar, Ramban MLA Naleem Langeh, Bhaderwah MLA Daleep Parihar and two MLAs Khalil Bhand and Abdul Majeed Bhat from Kashmir, he said, adding, they were stranded at various places on the highway.Efforts are being made to airlift another MLA G M Saroori from Kishtwar, who is stranded there due to blockade of Batote-Kishtwar road as well as the highway.last_img read more

Delhi govt to ban tobacco chewing from Monday

first_img“We have decided to come up with a notification to ban chewable tobacco in all forms from Monday in Delhi. Under this, no one will be allowed to sell, purchase or store chewable tobacco,” Delhi Health Minister Satyendra Jain told reporters on Friday.He said enforcement teams of Delhi Police as well as the health department have been asked to conduct surprise inspections across the city to ensure that the ban is implemented. “The teams have been told to be active on this,” Jain said. However, no such ban will be enforced on cigarettes. Health Department officials said there was a Delhi government notification in September 2012 which was in pursuance of a series of directions from the Supreme Court to ban gutkha in the city. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJIBut since the ban mentioned the term “gutkha”, the tobacco retailers started selling the components of gutkha (betel nut and raw tobacco) in separate pouches. So, the purpose of banning gutkha was not served. Therefore, the health department last year started with a new proposal to ban all raw chewable tobacco products in Delhi, a senior official said.According to officials, gutkha is also being supplied to retailers in Delhi from neighbouring states of Uttar Pradesh and Haryana. Stepping up its efforts towards tobacco control, the health department has also launched an innovative drive, creating a ‘Tobacco Aware Citizens’ Directory’ to spread an awareness about its harmful effects.Sources in the government said the ban on the sale, purchase and storage of chewable tobacco in all forms would be for the next one year and thereafter, the government will re-notify it. “Lieutenant-Governor Najeeb Jung has already given his nod and the government will issue the notification to ban chewable tobacco in all forms from Monday,” said a senior government official.last_img read more