Japanese scientists explore electric roads for EVs Their solution is in the form of a wireless power prototype that can successfully transmit electricity through the concrete block. They consider the prototype as an early step to improve on, and that such an approach can be used one day to keep electric vehicles on the move. Takashi Ohira, an electrical engineering professor at the Toyohashi University of Technology, who leads the team, has developed his electric field coupling system to supply a charge to a car through its tires. The goal is to enable power transmission as the vehicle’s tires travel along the road with suitable efficiency and power transfers.In the demo, a metal plate was placed along with a four-inch layer of concrete, representing the road surface. Electricity between 50 and 60 watts was transmitted to actual-size automobile tires. The demo also showed a light bulb, attached between the two demo car tires, turning on.The university team’s project is called EVER (Electric Vehicle on Electrified Roadway). The focus is research aimed at using wireless power transmission technologies based on electric field coupling for transmitting power to a running vehicle.The July demo is the latest of similar past efforts by the researchers. Last year, Toyota Central R&D Labs and Ohira reported on their work to allow electric cars to drive unlimited distances on an electrified roadway. They reported a system that similarly transmits electric power through steel belts inside the two tires and a metal plate in the road. They presented their work at a workshop in Kyoto. To test how much energy would be lost as electricity traveled through the tire rubber, the researchers also set up a lab experiment with metal plates. “Less than 20 percent of the transmitted power is dissipated in the circuit,” said Ohira at that time. With enough power the system could run typical passenger cars, he added.To make their present technology useful, the electric power needs to be increased by 100 times. But, moving ahead, the group said that they are up to the task of meeting the project’s challenges. Explore further (Phys.org) — Electric vehicles’ future continues to tease scientists to devise promising and practical ideas to keep these cars moving along the highways without having to pull over and wait for a battery recharge. Solutions for the so called “charging and range problem” took yet another twist this month when a Japanese university team demonstrated how electricity can be transmitted to a pair of tires through a four-inch-thick block of concrete, the type of concrete used on roads. The team took its demo to WTP (Wireless Technology Park) 2012, a trade show on wireless technologies, earlier this month in Yokohama. vit Techon Citation: Japan demo shows electricity entering EV through tires (2012, July 8) retrieved 18 August 2019 from https://phys.org/news/2012-07-japan-demo-electricity-ev.html 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.
More information: Eye patches: Protein assembly of index-gradient squid lenses, Science (2017). science.sciencemag.org/cgi/doi … 1126/science.aal2674AbstractA parabolic relationship between lens radius and refractive index allows spherical lenses to avoid spherical aberration. We show that in squid, patchy colloidal physics resulted from an evolutionary radiation of globular S-crystallin proteins. Small-angle x-ray scattering experiments on lens tissue show colloidal gels of S-crystallins at all radial positions. Sparse lens materials form via low-valence linkages between disordered loops protruding from the protein surface. The loops are polydisperse and bind via a set of hydrogen bonds between disordered side chains. Peripheral lens regions with low particle valence form stable, volume-spanning gels at low density, whereas central regions with higher average valence gel at higher densities. The proteins demonstrate an evolved set of linkers for self-assembly of nanoparticles into volumetric materials. Explore further Optic lobe of giant squid found proportionally smaller than for other cephalopods (Phys.org)—A team of researchers with the University of Pennsylvania has uncovered the means by which squid eyes are able to adjust to underwater light distortion. In their paper published in the journal Science, the group describes their work analyzing squid eye parts under a microscope, what they found and then offer an explanation of the process involved in squid vision. Tobias Madl with Medical University of Graz in Austria offers an overview of how lenses work in general in a Perspective piece in the same journal issue, and outlines the work done in this new effort. Credit: CC0 Public Domain Prior work with squid had shown that their eyes are unique. The refractive index of each lens is greatest at its center and grows smaller toward the edges. This contrasts sharply with how glass lenses work—they have the same refractive index over their whole area—their shape focuses the light. The unique squid lens has clearly evolved to better handle the murky light available in the ocean, allowing the creatures to see much better than humans and many other sea creatures that have traditional lenses. In this new effort, the researchers sought to learn how the squid eye is able to pull off this feat.The study consisted of cutting squid eyes and studying them layer by layer under a microscope and applying small-angle X-ray scattering to learn more about the way light behaved as it encountered each layer and part of a lens. The researchers found that the lens was made mostly of a protein gel in the S-crystalline family. They attribute changes in the refractive index to the arrangement of the crystalline molecules. They found that in the center of the lens, the molecules were bound together in relatively large structures. The structures grew smaller relative to their distance from the center. At the edges of the lens, the structures were made from just two molecules. This works for the squid, because the structures allow for bending light differently depending on which part of the lens is struck. The result is far more clarity under dim light conditions. Citation: Globular proteins found to allow squid eyes to adjust for light distortion (2017, August 11) retrieved 18 August 2019 from https://phys.org/news/2017-08-globular-proteins-squid-eyes-adjust.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. Journal information: Science © 2017 Phys.org
Citation: Scientists reach milestone in 3-D laser writing in bulk silicon (2017, October 18) retrieved 18 August 2019 from https://phys.org/news/2017-10-scientists-milestone-d-laser-bulk.html Researchers fabricate 3-D silicon structures with a focused infrared laser More information: Margaux Chanal et al. “Crossing the threshold of ultrafast laser writing in bulk silicon.” Nature Communications. DOI: 10.1038/s41467-017-00907-8 Journal information: Nature Communications The researchers expect that the results will open the doors to 3D laser writing for silicon photonics applications, as well as for studying new physics in semiconductors.The scientists, Margaux Chanal et al., from institutes in France, Qatar, Russia, and Greece, have published their paper “Crossing the threshold of ultrafast laser writing in bulk silicon” in a recent issue of Nature Communications.In previous attempts at ultrafast laser writing in bulk silicon, scientists found that femtosecond lasers simply weren’t capable of structurally manipulating the bulk silicon, even when the laser energy was increased to the highest pulse intensity technologically possible. In the new study, the researchers found that, fortunately, there is no physical limit that prevents ultrafast laser-induced structural manipulations of bulk silicon. Instead, they found that the laser energy has to be delivered in the medium in an abrupt way in order to minimize losses from nonlinear absorption. This finding revealed that the problem of all past efforts arose from the laser’s small numerical aperture (NA), which refers to the range of angles over which focused laser light can be delivered. The researchers calculated that, in order to achieve the desired results, it would be necessary to obtain extreme NA values that have so far not been realized in this area.In order to reach these extreme NA values, the researchers borrowed a technique from advanced microscopy called solid-immersion microscopy. The idea is similar to the commonly used liquid-immersion microscopy, in which a small drop of oil is placed on the slide. As oil has a larger refractive index than air, the oil reduces the amount of optical refraction (bending of light) as the light travels between the slide and the microscope lens. This, in turn, increases the NA and the associated microscope’s resolution (the NA for a microscope measures the range of angles over which light is collected rather than delivered). The difference with solid-immersion microscopy is that a solid material with a high refractive index is used instead of a liquid. (Phys.org)—It has taken more than 20 years, but researchers have demonstrated for the first time that femtosecond lasers can be used to structurally manipulate bulk silicon for high-precision applications. Since the late ’90s, researchers have been using the ultrashort pulses of femtosecond lasers to write into bulk materials with wide band gaps, which are typically insulators. But until now, precise ultrafast laser writing has not been possible for materials with narrow band gaps, such as silicon and other semiconductors. © 2017 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. In the new study, the researchers used silicon spheres as the solid-immersion medium. They found that, when focusing the laser at the center of a sphere, they could completely suppress refraction and greatly increase the NA. The extreme NA values allowed the laser pulses to achieve sufficient ionization to break chemical bonds in the silicon, which in turn causes permanent structural changes in the material.”The in-depth understanding of the physics of the interaction and propagation of ultrashort laser pulses in low-band-gap semiconductors, like silicon, enabled us to solve this long-standing problem and achieve controlled material structural modifications, appropriate for applications,” coauthor Stelios Tzortzakis, at the Texas A&M University at Qatar, FORTH, and the University of Crete in Greece, told Phys.org. “Even more, the localized energy deposition in the medium results in out-of-equilibrium phases with extreme thermal and pressure gradients that can enable the creation and study of new states of matter, previously unreachable in laboratory environments.” In the future, the researchers plan to further push the boundaries of this approach by borrowing another microscopy technique called 4-Pi arrangement. This concept involves crossing multiple laser pulses with extreme NA values at the centers of spheres, which may lead to even greater possibilities in ultrafast laser writing in bulk silicon and other semiconductors.”3D laser writing applicable to silicon may drastically change how things are designed and fabricated in the important field of silicon photonics,” said coauthor David Grojo at CNRS/Aix-Marseille University in France. “Silicon photonics is seen as the next revolution of microelectronics using light at the chips level for ultimate speed data processing. However, it remains today a 2D world because of the planar lithographic methods used for fabrication (SOI technology). With our method we can envision the equivalent of a 3D printer for rapid prototyping of any innovative architecture. This will make possible for silicon photonics specialists to design things in 3D that must represent a real booster for the emergence of disruptive technologies and new concepts.” Experimental setup of using 60-femtosecond laser pulses for laser writing in silicon. Credit: Chanal et al. Published in Nature Communications Explore further
Nagpur-based sculptor and performance artist Surbhi Bhattad began her month-long performance art here Saturday to protest gender abuse and rape.She is performing at Dilli Haat in south Delhi and at Great India Place Mall at Noida with an act ‘Does the Glorious Movie Scenes Inspire You To Rape?’The performance is a body act featuring the young artist, who lies on the floor like a corpse at a crowded public venue. She is clad in white with a leather chastity belt strapped to her groin. The chastity belt — shaped like a woman’s pelvis — has a screening device around the pubic region that beams footage of popular ‘rape sequences’ from eight Bollywood blockbusters with the message, ‘Does this inspire you to rape?’ Also Read – ‘Playing Jojo was emotionally exhausting’Bhattad will perform at the two venues for three hours everyday to challenge onlookers to react to the footage. ‘The performance is difficult and disturbing because the footage sends different vibrations in my body. It makes me cry. It involves a certain amount of risk,’ said Bhattad after a performance. The reactions of the audience, who had to look at her pelvis to see the videos, ranged from outrage to trauma. Most of the male viewers admitted to feeling ‘confused’ and ‘humbled’. The performance has been inspired by the artist’s intervention work with ‘victims of gender and child abuse’ in Nagpur. Also Read – Leslie doing new comedy special with Netflix‘I have been speaking to women who have been sexually and psychologically abused. Bollywood movies have been a trigger in titillating libidos and reckless behaviour among the lower middle social segments, where education and awareness are yet to make incursions,’ Bhattad said.The artist said ‘she found it easy to engage with her body in carrying forth the gender message’. Bhattad’s performance has been described by critics as an eye-catching exhibit among 15 works of multi-media public art across 15 venues in the capital in a new project ‘Publica’, which opened Saturday for a month. Designed around the theme, ‘Spectacle’, the exhibits highlight ‘pollution, road accidents, body building, changing play spaces in cities and yoga’ by three international and 12 Indian artists.The venues include Indira Gandhi International Airport, DLF Emporio, Promenade Mall, India Habitat Centre, Dilli Haat, Select City Walk, The Great India Place, Garden of Five Senses and Sabyasachi @ Carma fashion store in Mehrauli. The festival is being supported by the Delhi government and Ho Ho buses which will touch the venues in a special festival run everyday. Publica has been curated by the Floodlight Foundation led by Delhi-based arts entrepreneur Surbhi Modi. ‘The festival is trying to embed appreciation and understanding of public art into everyday life and use arts as a tool to build awareness,’ Modi said.
Buckling under pressure, the Home Ministry has withdrawn its recent order declaring all districts of Arunachal Pradesh bordering Assam as “disturbed areas” under controversial AFSPA and issued a fresh one restricting it to a few police stations, apart from the three districts covered earlier.”In supersession of the notification dated March 27, 2015, the area falling within the jurisdiction of following police stations in districts of Arunachal Pradesh, bordering Assam are declared as ‘disturbed area’ under section 3 of the Armed Forces (Special Powers) Act 1958
Grieving over excess hair fall? Massaging your scalp for a few minutes daily and avoiding combing wet hair will help in preventing it, says an expert.Dilip Kundlia, director of Oshea Herbals, has shared some tips to prevent hair fall.Hair massage treatment: Massaging your scalp for a few minutes daily will help stimulate circulation. Good circulation on the scalp keeps hair follicles active. Take olive or coconut oil, mix two drops of lemon in it. Massage it gently into your scalp. Put on a shower cap and leave it on for an hour, then shampoo your hair. Also Read – ‘Playing Jojo was emotionally exhausting’ Homemade hair spa: Blend some drops of olive oil in warm water and dip a heavy towel in the water for two minutes and then cover your hair with the towel. This will give your hair a natural spa. Natural juices: You can rub your scalp with either garlic, onion or ginger juice. Leave it on overnight and wash it thoroughly in the morning. Do not comb wet hair: It is best not to comb wet hair as this leads to greater chances of hair breakage and fall. Let it be dry or semi-dry before combing.
Bengal Chief Minister Mamata Banerjee with members of the Bhutan Royal Family. The Bhutan Prime Minister, in a break from protocol, drove Banerjee to her hotel on Wednesday. Banerjee had on Wednesday discussed various issues of mutual interest with Bhutan’s Foreign Affairs Minister during her trip to the Himalayan nation. “Bengal is the only eastern state sharing a contiguous border with Bhutan. We had a very useful discussion on various important issues common to Bhutan and Bengal. We reiterated our commitment towards continuance of our excellent relationship with Bhutan in line with our long, long tradition,” Banerjee said in a Facebook post. The Chief Minister was invited for a luncheon audience with His Majesty the Fourth Druk Gyaplo and their Majesties the Queen Mothers at Dechenchholing Palace.
Kolkata: Bengal has witnessed massive infrastructure development in the past seven years, to ensure a better firefighting mechanism in the state.Chief Minister Mamata Banerjee said: “Since pre-Independence to 2011, as many as 100 fire stations had come up in the state. While in the past seven years, 41 fire stations have come up in Bengal and 20 are under construction. Moreover, the process of setting up another 41 is also going on.” She said that it is a remarkable development of infrastructure facilities. Also Read – Rain batters Kolkata, cripples normal lifeBanerjee on Tuesday flagged off 30 fire tenders of 5,000 litre capacity and 20 fire tenders of 8,000 litre capacity. The programme for the same was held outside Nabanna. She said as many as 674 fire fighting vehicles have been introduced in the past seven years and there are 136 motorcycle-mounted firefighting arrangements. “I feel there is a need to increase such arrangements to fight fire properly in congested areas,” the Chief Minister said, adding that some Panchayat areas are also getting congested and such mechanism is also needed in such places. These are also helpful in urban and semi-urban areas. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedShe further said that she had got the idea of introducing motorcycle-mounted firefighting arrangements during her visit to Germany. “Vehicles there ply at speeds of around 250 km per hour and I found that a road accident had taken place. Helicopters were pressed in to rescue the people. At the same time, I found that materials required for rescue operations were brought on motorbikes. After returning, I put forth the idea of introducing the motorcycle-mounted firefighting arrangement,” Banerjee said, adding that the Disaster Management department, the state Fire and Emergency Services department and police should take steps to introduce more motorcycle-mounted firefighting arrangements. She further added that pilot cars are now being engaged for piloting another vehicle and the use of motorbikes for the same purpose would be more economical. She further said that three hydraulic ladders were also introduced in the past seven years, to fight fires in high-rise buildings. Banerjee also directed the police to ensure coverage of maximum areas using CCTV cameras. She said: “It is not always possible to be present physically to maintain a vigil. So, installation of CCTV cameras will help to carry out better surveillance.” In the past seven years, fire stations have been constructed in different rural parts and infrastructure of the fire stations, which have been existing for the past several years, has also been improved.