Touchable Hologram Becomes Reality w Video

first_img Explore further Called the Airborne Ultrasound Tactile Display, the hologram projector uses an ultrasound phenomenon called acoustic radiation pressure to create a pressure sensation on a user’s hands, which are tracked with two Nintendo Wiimotes. As the researchers explain, the method doesn’t use any direct contact and so doesn’t dilute the quality of the hologram. The researchers, led by Hiroyuki Shinoda, currently have the technology on display at SIGGRAPH 2009 in New Orleans. 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. “A retroreflective marker is attached on the tip of user’s middle finger,” the researchers explain on their website. “IR LEDs illuminate the marker and two Wiimotes sense the 3D position of the finger. Owing to this hand-tracking system, the users can handle the floating virtual image with their hands.”In the video, the researchers demonstrate how a user can dribble a virtual bouncing ball, feel virtual raindrops bouncing off their hand, and feel a small virtual creature crawling on their palm. The researchers hope that the technology will have applications in video games, 3D CADs, and other uses.More information: Shinoda Lab© 2009 PhysOrg.com Citation: Touchable Hologram Becomes Reality (w/ Video) (2009, August 6) retrieved 18 August 2019 from https://phys.org/news/2009-08-touchable-hologram-reality-video.htmlcenter_img Video: Swine flu health tips (PhysOrg.com) — Researchers from the University of Tokyo have developed 3D holograms that can be touched with bare hands. Generally, holograms can’t be felt because they’re made only of light. But the new technology adds tactile feedback to holograms hovering in 3D space. In this demonstration of the touchable hologram, ultrasound is radiated from above and the user feels as if a rain drop hits his palm. Credit: Hiroyuki Shinoda.last_img read more

Read More »

Researchers restore light sensitivity to retina using polymerbased optoelectronic interface

first_img Citation: Researchers restore light sensitivity to retina using polymer-based optoelectronic interface (2013, March 18) retrieved 18 August 2019 from https://phys.org/news/2013-03-sensitivity-retina-polymer-based-optoelectronic-interface.html The photoreceptor layer is replaced in the degenerate retina by the organic polymer. Credit: doi:10.1038/nphoton.2013.34 Explore further Journal information: Nature Photonics Zebrafish may hold the answer to repairing damaged retinas and returning eyesight to people This new research by the group follows up on research the team conducted two years ago, where they found that they could grow neurons on top of photovoltaic polymers. In this new effort, they placed the polymer poly(3-hexylthiophene) on a small sheet of glass then followed that up by placing a damaged retina extracted from a rat on top of it. Using the same techniques they’d discovered in their earlier work, they coaxed the cells into incorporating themselves with the polymer. Once that occurred, they shined a light on the result and found that neural activity occurred that was very similar to what happens with retinas that are not damaged.The polymer used in the experiment is one of a class that is able to convert light into electricity without the need for any other power source. Such materials, the researchers believe, make them ideal candidates for use as a possible means of correcting vision problems in people with retina damage due to diseases such as macular degeneration or retinitis pigmentosa. In these cases, the rods and cones—photoreceptor cells—that make up the retina are damaged or destroyed slowly robbing their victim of sight. The idea with the new research is to see if photovoltaic polymers can be used to replace the damaged nerves, and thus restore vision.In their experiments the researchers found the retina/polymer combination responded to what they describe as average daylight brightness levels indicting it might prove useful as a means of treating certain types of blindness. They caution however that they also observed that the combined material did not respond to the full range of brightness levels as seen by a healthy eye, though they suggest they believe more research will produce better results. The team next plans to implant their polymer optoelectronic interface into blind rats to see if it can restore vision and if so, how well.center_img (Phys.org) —A team of researchers in Italy has successfully demonstrated a means for restoring light sensitivity to a damaged rat retina by incorporating an inorganic polymer with nerve cells. In their paper published in the journal Nature Photonics, the team describes how they placed a damaged rat retina atop a glass substrate covered with a light sensitive polymer and then found that shining a light on the mix resulted in neural activity similar to that which occurs with a healthy retina. © 2013 Phys.org More information: A polymer optoelectronic interface restores light sensitivity in blind rat retinas, Nature Photonics (2013) doi:10.1038/nphoton.2013.34AbstractInterfacing organic electronics with biological substrates offers new possibilities for biotechnology by taking advantage of the beneficial properties exhibited by organic conducting polymers. These polymers have been used for cellular interfaces in several applications, including cellular scaffolds, neural probes, biosensors and actuators for drug release. Recently, an organic photovoltaic blend has been used for neuronal stimulation via a photo-excitation process. Here, we document the use of a single-component organic film of poly(3-hexylthiophene) (P3HT) to trigger neuronal firing upon illumination. Moreover, we demonstrate that this bio–organic interface restores light sensitivity in explants of rat retinas with light-induced photoreceptor degeneration. These findings suggest that all-organic devices may play an important future role in subretinal prosthetic implants. 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

Read More »

Semiconductor shish kabob nanostructures combine properties from different dimensions

first_img The scientists, Chun Li, et al., at North Carolina University in Raleigh, North Carolina; and Oak Ridge National Laboratory in Oak Ridge, Tennessee, have published a paper on the nanosheet-nanowire heterostructures in a recent issue of Nano Letters.So far, most research on growing nanoscale heterostructures has focused on combining materials that have the same dimensions. Studies that involve combining materials with different dimensions have remained limited because it is much more difficult to integrate these materials into a single structure due to their different growth mechanisms. However, as the researchers here explain, integrating materials with different dimensions is attractive because it can combine the advantages of both materials while mitigating the disadvantages. As a result, such heterostructures may enable novel functions that cannot be obtained from each of the components separately. (Phys.org) —By growing 2D nanosheets along the surface of a 1D nanowire, scientists have synthesized a new 3D nanoscale heterostructure that they call—for appropriate reasons—”shish kabobs.” Due to the integration of the two dimensionalities, the new structures could have a wide variety of applications, such as for solar energy conversion, energy storage, and photonics. Copyright 2013 Phys.org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of Phys.org. Explore further SEM images of nanosheet-nanowire heterostructures. The researchers found that air exposure facilitates the nucleation of nanosheets by modifying the surface of the nanowire. Credit: Chun Li, et al. ©2013 American Chemical Society Researchers create semiconductor ‘nano-shish-kebabs’ with potential for 3-D technologies 2D nanosheets grown on a 1D nanowire can combine the advantages of both dimensionalities and may enable novel functions that cannot be obtained from each of the components separately. Credit: Chun Li, et al. ©2013 American Chemical Societycenter_img Citation: Semiconductor ‘shish kabob’ nanostructures combine properties from different dimensions (2013, March 27) retrieved 18 August 2019 from https://phys.org/news/2013-03-semiconductor-shish-kabob-nanostructures-combine.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: Nano Letters More information: Chun Li, et al. “Epitaxial Nanosheet-Nanowire Heterostructures.” Nano Letters. DOI: 10.1021/nl303876a To synthesize the new nanosheet-nanowire structures in this study, the researchers used a two-step approach, first growing the nanowires and then growing the nanosheets at certain sites on the nanowires. They used germanium sulfide as the material for both components, but predict that the same approach will apply to other similar materials. In order to yield nanowire-nanosheet heterostructures, the researchers exposed the grown nanowires to air for a few minutes to a few days prior to the nanosheet growth step. The air exposure likely causes mild oxidation on the surface of the nanowires, which changes its surface properties. The researchers think that these surface imperfections may facilitate the nucleation of the nanosheets better than a perfect surface can.After the nanowires were exposed to air, the researchers could successfully grow nanosheets on the nanowire surface along the radial direction, so that they were arranged like pieces of chicken and peppers on a skewer. Besides their appeal due to this unusual architecture, the nanowire-nanosheet heterostructures also have an appealing combination of characteristics, notably a large surface area due to the 2D nanosheets and efficient charge transport due to the 1D nanowire. For these reasons, the new nanostructures could have applications in photovoltaics, supercapacitors, lithium-ion batteries, 3D optoelectronics, and chemical sensing.last_img read more

Read More »

Two suffer bullet injuries in Panchayat poll violence

first_imgKolkata: A sub-inspector of police in South 24-Parganas and a Trinammool Congress candidate contesting Panchayat elections from Nadia’s Chakda suffered bullet injuries in two separate incidents.The police officer was injured in Usti area of South 24-Parganas when filing of nominations was going on in the area on Monday morning. The incident triggered tension in the area. It occurred when some miscreants were hurling bombs in the area and firing bullets to disrupt the process of nominations. Also Read – Heavy rain hits traffic, flightsThe victim, SI Rafikujjaman along with some other police officers rushed to the spot to bring the situation under control. It was alleged that miscreants initially pelted stones at the policemen. They later hurled bombs and fired a few rounds to terrorise locals. The victim suffered a bullet injury during the incident. The incident, however, did not have any impact on the nomination process. He was immediately rushed to a nearby hospital where he is undergoing treatment. His condition is stated to be serious. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedIn the other incident, a Trinamool Congress candidate from Nadia sustained bullet injuries when some miscreants shot at him. The victim, Ashim Biswas, a Trinamool Congress candidate contesting Panchayat poll from Chakdah was returning home riding his motorcycle from a rally when some unidentified miscreants stopped his way and shot at him from a close quarter. A bullet grazed his body. The miscreants fled the spot after locals came to his rescue. He was taken to a hospital for treatment. His condition is stated to be stable now.last_img read more

Read More »

Apex Court appoints 5 judges for Calcutta HC

first_imgNew Delhi/Kolkata: In a major development, the Supreme Court collegium has finalised the names of five judges for the Calcutta High Court. According to Law Ministry officials, the top court collegium has approved the names of five advocates as judges of Calcutta HC, while the decision over the selection of two other judges has been deferred as of now.The SC collegium has approved the names of Biswajit Basu, Amrita Sinha, Sutanu Kumar Patra, Abhijit Gangopadhyay and Jay Sengupta as the judges of HC, while the collegium has disapproved the names of Tirthankar Ghosh and Hiranmay Bhattacharya for their elevation to the post of judge. Also Read – Heavy rain hits traffic, flightsIn the matter of appointment of Ghosh, the collegium has stated that it needs further information to assess the suitability. The acting chief justice of Calcutta HC may be requested accordingly, the collegium said in its order.The proposal for the elevation of Hiranmay Bhattacharya has been deferred for now, the order stated.”For the purpose of assessing merit and suitability of the recommendees for elevation to the High Court, we have carefully scrutinised the material placed in the file, which includes the views of the Chief Minister as forwarded by West Bengal Governor, etc,” the SC collegium said in its order.According to a law ministry official, the notification in this regard would come soon. It may be mentioned that out of the total 73 posts of judges, 39 are lying vacant.last_img read more

Read More »

Left strike proves damp squib

first_imgKolkata: The six-hour bandh, called by the Left Front, failed to evoke any response in the state with people rejecting the “strike culture” altogether venturing out for their offices and respective destinations on Friday.It may be recalled that Chief Minister Mamata Banerjee had criticised the strike from 6 am to 12 noon saying that it was nothing but a gimmick. Before leaving the state Secretariat on Thursday, the Chief Minister said they should call a bandh at midnight to make it successful. Also Read – Heavy rain hits traffic, flightsStating that the people of Bengal have rejected the call for the bandh, Partha Chatterjee, secretary general of the Trinamool Congress, said the Left Front has called the strike for political mileage and people have realised that there is no need to respond to such a call which is politically motivated. “Those who are trying to ensure damage to the state have been defeated by the masses,” said Chatterjee adding that the people have once again stood by the development of the state by rejecting the call for bandh. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedAfter the change of guard in 2011, the Mamata Banerjee government has brought an end to the strike culture that had earned a negative image to the state before her government came to power. The state government had taken all the necessary steps to ensure that people do not face any inconvenience to reach their workplaces whenever bandh was called in the past six-and-half-years. It has helped to revive the work culture in the state and with similar arrangements on Friday as well, people did not even realise that there was a call for bandh for six hours till 12 noon on Friday. The state Transport department pressed additional buses into service to ensure that commuters do not face any problem. All modes of transport were available since morning similar to that of other working days.People have not noticed any difference on Friday morning with all the shops remaining open like normal days and people could reach their offices without facing any inconvenience and all marketplaces were also operational. Similarly, school and college goers too did not face any trouble.A resident of North Kolkata, Manoj Jha, who was found taking his daughter to school, said he even didn’t know that a strike has been called and he would also go to his office after dropping his daughter to school.The turnout at all the state government offices was overwhelming. Like all other days, employees started turning up before 10 am and there were the usual queues to take the elevator at Nabanna. A similar overwhelming response of employees was also found in offices of the state government in the districts as well. Sources added that there was cent percent attendance in the Personnel and Administrative Reforms Department. The picture was same in the state IT hub at Salt Lake where techies joined their work with equal enthusiasm. According to a senior official of an IT company, people in Salt Lake Sector V were not even aware that there was a bandh. Many delegates from other states also visited some of the offices on Friday and they were happy to know that there was no effect of the bandh in the state’s IT sector, the official added.last_img read more

Read More »

Decorate your home with Tsutra

first_imgSasha and sanskar are showcasing textured Chandrabati cottons. Abstract prints with  surface detailing in kurtas, kaftans, panelled tunics,and coats with embroidered saris that create a fresh take for the coming festive season. Phulia cotton scarves  and jamdani stoles also add style to  patchwork and layered jackets and wraped in various cotton textures and silk prints create a new  cultural canvas.An exhibition that began on friday showcases craft, ensembles for women, hand woven home textiles, Kurtas, Kaftans, Sarees, Jackets and stoles in cotton and silk print recycle quilting and Kanthaand. Also Read – ‘Playing Jojo was emotionally exhausting’This eclectic collection is complimented with  special personal accessories like leather hand bags, Dhokra jewellery, home textiles in silks and  recycled fabrics with traditional quilting and Kantha work. This collection, which will be showcased at the Alliance Francaise de Delhi for the third consecutive year will incorporate an  interesting block printing series coined the transport series, abstract florals and stripes.It also add an element of heritage through traditional embroideries like Aari and Zardosi developed into cushion covers.  Patchwork throws and kantha bedspreads add  a feel of Nostalgia to the collection.When:  September 18 to 20 Where: Alliance Francaise de Delhi, 72 Lodhi EstateTimings: 11 am – 7 pmlast_img read more

Read More »

Going beyond just pottery

first_imgWhen a Professor decides to hang up her boots and probe hidden embers of firing and glazes and clay constructions – it becomes more than a mere pilgrim’s journey. Manjari Sharma’s affair with stoneware began more than 15 years ago when exploring clay meant going beyond pots and bowls and platters – exploring clay meant an embodiment of the gestural spontaneity and visual momentum of abstraction as well as gauging degrees of expressionism along with the dramatic Shakespearean – like acceptance of imperfections that characterizes the creation of sculptural pottery in all its manifestations. Also Read – Add new books to your shelfManjari works with a personal structural vocabulary which she pours overthrown shapes including cylinders, bowls, plates, clay slabs, and whatever forms her hand or mallet could pierce, press, pinch or paddle. Pottery is not only bowls and pots and platters, pottery is a journey that enfolds and explores and experiments with forms and glazes and textures and expression. Manjari moves a step ahead with human expressions that are full of drama and deep intensity. Her lamps with quirky lips are delightful, her bowls with human hands are truly sculptural, her jars with lids that have fingers are a statement in the power of human emotions. Also Read – Over 2 hours screen time daily will make your kids impulsive”A very noticeable outcome of my journey within was a loss of fear and hence the ability to play more. In the celebration of the “human experience”, I found greater acceptability of the good with the bad or the pretty with the ugly. I realized that everything is contextual. There are no absolute truths. In fact, I feel that perfection and beauty are fairly violent concepts they are so non-inclusive,” says sculptor Manjari Sharma. Curator Uma Nair who has followed her works for 20 years says,”Manjari doesn’t merely throw pots, she builds and fashions them. Indeed, she uses a potter’s wheel on which to spin the initial clay forms; but after that first rudimentary step the traditional method of wheel-thrown pottery is dramatically overturned.” The show which opened on April 16, will run till April 23 at Lalit Kala Akademi, Rabindra Bhavan.last_img read more

Read More »

Abhishek urges people to turn Mamatas dream of winning all 42 LS

first_imgKulgachia (Howrah): Abhishek Banerjee, All India Trinamool Youth Congress president and party MP, has urged people to fulfill Mamata Banerjee’s dream of winning 42 out of 42 Lok Sabha seats in the forthcoming election. He was addressing a rally here on Thursday afternoon.Banerjee said people are fed up with the BJP government because of their “systematic and consistent lies”. “Before 2014 Lok Sabha election Narendra Modi had assured that ‘acche din ayenge’ (good days will come). We have all seen what has happened to the country in the past four and a half years. In the name of note ban, common people were harassed. People lost jobs and public money was looted,” Banerjee said. Also Read – 3 injured, flight, train services hit as rains lash BengalRaising the issue of former Trinamool Congress MP Saumitra Khan joining BJP, Banerjee said: “It is really interesting to note that BJP accepts the ones we have rejected. We have sacked Khan from our party and now BJP has given him a platform.” He said the rally on January 19 at Brigade parade ground will be a historic one and all the national leaders will come to strengthen the hand of Mamata Banerjee, who had first spoken about the Federal Front. He urged the people to attend the rally on January 19. “She will give us the roadmap which we will follow in the Lok Sabha election. It is Mamata Banerjee’s dream to win 42 out of 42 seats in Lok Sabha and we should work hard to fulfill it,” he added. He cautioned people against BJP’s divisive politics. “BJP wants to divide the society and we should not fall into their trap. We believe that Hinduism is humanism and we follow the path of Swami Vivekananda,” Banerjee said.last_img read more

Read More »

Garbage segregation mission Residents vow to keep city clean

first_imgKolkata: The residents of New Town took a pledge on Friday that they would segregate garbage at source and help to make the city clean and green.New Town Kolkata Development Authority ( NKDA) introduced the new system of segregating garbage at source from Friday. An awareness camp was held at Rabindra Tirtha which was inaugurated by Debashis Sen, chairman NKDA. There was a workshop on solid waste management and there was a live demonstration to show where the residents will dispose the waste. The residents will have to buy two bins whose sizes have been determined by NKDA. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseThey will be disposing garbage in two separate bins meant for dry waste and wet waste. The waste will be collected regularly and NKDA has proposed to start composting with wet waste. The body has already set up a plant and the compost is being used as manure for production of organic vegetables. The dry waste will be collected twice a week and NKDA is setting up a trenching ground at Patharghata. NKDA authorities have urged the residents to use the bins properly and put the waste in the specified bins. It may be mentioned that NKDA has taken several steps to make New Town a green and clean city. Waste water is being used for roadside plants and state-of-the-art vehicles are being used to clean roads. Later, a walk was organized in which the residents and the officials of NKDA took part. There was great enthusiasm among the participants and they have all agreed to cooperate with NKDa to make New Town a clean and green city.last_img read more

Read More »