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. U.S. to increase wild bird avian flu tests A team at the Zoological Society of London, led by Dr. Becki Lawson, is tracking an increased spread of an avian pox virus that is rapidly moving through the UK and affecting the great tits. Researchers are asking the public to help them track the spread of this virus. The virus was first discovered in the UK in 2006 but before then had been confined to birds in Austria, Czech Republic, Scandinavia and Slovakia. Until this year, the virus had stayed contained to south-east England but is now spreading to the north and west.Avian pox causes wart-like tumor growths on the birds, predominately around the eyes and beaks. Researchers do not know if the tumors are fatal or not but they do affect the bird’s ability to see and eat, leaving them more vulnerable to predators and starvation.Avian pox can be transmitted via insect bites, direct contact with other birds or indirect contact in places where multiple birds frequent, such as bird feeders, bird baths and garden perches. The researchers explain that the virus can remain in the environment for weeks or months.They are recommending that homeowners with bird baths and feeders keep them disinfected on a regular basis in order to try and reduce the spread of the virus. They are unable to give medicine to free-range birds and are hoping to find a way to prevent the transmission.Avian pox has also been noted in birds such as the dunnock, house sparrow, starling and wood pigeon however, it seems to affect these birds in a much milder form than it does the great tits.The RSPB has asked that residents report possible sightings of birds displaying symptoms of the avian pox to the RSPB Wildlife Enquiries Unit at 01767 693690. © 2010 PhysOrg.com Explore further Citation: UK garden bird avian pox virus spreading (2011, August 4) retrieved 18 August 2019 from https://phys.org/news/2011-08-uk-garden-bird-avian-pox.html
Journal information: arXiv More information: Space-time crystals of trapped ions, arXiv:1206.4772v1 [quant-ph] arxiv.org/abs/1206.4772AbstractGreat progresses have been made in exploring exciting physics of low dimensional materials in last few decades. Important examples include the discovering and synthesizing of fullerenes (zero dimensional, 0D), carbon nanotubes (1D) and graphene (2D). A fundamental question is whether we can create materials with dimensions higher than that of conventional 3D crystals, for example, a 4D crystal that has periodic structures in both space and time. Here we propose a space-time crystal of trapped ions and a method to realize it experimentally by confining ions in a ring-shaped trapping potential with a static magnetic field. The ions spontaneously form a spatial ring crystal due to Coulomb repulsion. This ion crystal can rotate persistently at the lowest quantum energy state in magnetic fields with fractional fluxes. The persistent rotation of trapped ions produces the temporal order, leading to the formation of a space-time crystal. We show that these space-time crystals are robust for direct experimental observation. The proposed space-time crystals of trapped ions provide a new dimension for exploring many-body physics and emerging properties of matter. Citation: Physics team proposes a way to create an actual space-time crystal (2012, July 9) retrieved 18 August 2019 from https://phys.org/news/2012-07-physics-team-actual-space-time-crystal.html Explore further Wilczek thought that it should be possible to construct a space-time crystal because crystals naturally align themselves at low temperatures and because superconductors also operate at very low temperatures; it seemed reasonable to assume that the atoms in such a crystal could conceivably move or rotate and then return to their natural state naturally, continually, as crystals are wont to do as they seek a lowest energy state. He envisioned a rotation with a ring of ions that flowed separately rather than as a stream, likening it to a mouse running around inside of a snake laying as a circle. The bulge would flow, rather than the snake itself spinning and would just keep on going, potentially forever. The problem was, he couldn’t figure out how such a crystal structure could be created in the real world.Taking Wilczek’s original idea, but not his method for creating a real world example, Li et al, suggest that to create a space-time crystal all that’s needed is a better ion trap. They believe that if ions could be forced using such a trap, into a ring at very low temperatures, as a superconductor, all that would be needed would be a little nudge from a tiny bit of a magnetic field to cause the ions to begin rotating as a single ring. Because there would be no resistance, and because of their natural mutual repulsion, the ring should then continue rotating indefinitely with no additional injection of energy, resulting in the space-time crystal that Wilczek imagined.The team is quick to point out, for those that might be making the jump, that the result would not be the mythical perpetual motion machine because no energy could be extracted from the space-time crystal. They do believe that building an actual space-time crystal should be possible though, in the near term if a future team has the funds necessary to overcome the difficulty of creating a better ion trap. Schematic of creating a space-time crystal. a, A possible structure of a space-time crystal. It has periodic structures in both space and time. The particles rotate in one direction even at the lowest energy state. b, Ultracold ions conﬁned in a ring-shaped trapping potential in a weak magnetic ﬁeld. The mass and charge of each ion are M and q, respectively. The diameter of the ion ring is d, and the magnetic ﬁeld is B. c, The pseudo-potentials (Vext) for a 9Be+ ion in a quadrupole ring trap (solid curve) and a linear octupole trap (dashed curve) along the x or y axis. See arXiv:1206.4772v1 paper for details. (Phys.org) — Earlier this year, theoretical physicists Frank Wilczek, of MIT put forth an idea that intrigued the research community. He suggested that it should be possible to construct a so called space-time crystal by adding a fourth dimension, movement in time, to the structure of a crystal, causing it to become an infinitely running clock of sorts. At the time, Wilczek acknowledged that his ideas on how to do so were inelegant, to say the least. Now another international team led by Tongcang Li has proposed a way to achieve what Wilczek proposed using a far more elegant process. They have posted a paper on the preprint server arXiv describing what they believe is a real-world process for creating an actual space-time crystal that could conceivably be carried out in just the next few years. © 2012 Phys.org Time crystals could behave almost like perpetual motion machines 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.
Theorists apply loop quantum gravity theory to black hole 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: Ahmed Farag Ali and Saurya Das. “Cosmology from quantum potential.” Physics Letters B. Volume 741, 4 February 2015, Pages 276–279. DOI: 10.1016/j.physletb.2014.12.057. Also at: arXiv:1404.3093[gr-qc].Saurya Das and Rajat K. Bhaduri, “Dark matter and dark energy from Bose-Einstein condensate”, preprint: arXiv:1411.0753[gr-qc]. © 2015 Phys.org Citation: No Big Bang? Quantum equation predicts universe has no beginning (2015, February 9) retrieved 18 August 2019 from https://phys.org/news/2015-02-big-quantum-equation-universe.html No singularities nor dark stuffIn addition to not predicting a Big Bang singularity, the new model does not predict a “big crunch” singularity, either. In general relativity, one possible fate of the universe is that it starts to shrink until it collapses in on itself in a big crunch and becomes an infinitely dense point once again. Ali and Das explain in their paper that their model avoids singularities because of a key difference between classical geodesics and Bohmian trajectories. Classical geodesics eventually cross each other, and the points at which they converge are singularities. In contrast, Bohmian trajectories never cross each other, so singularities do not appear in the equations.In cosmological terms, the scientists explain that the quantum corrections can be thought of as a cosmological constant term (without the need for dark energy) and a radiation term. These terms keep the universe at a finite size, and therefore give it an infinite age. The terms also make predictions that agree closely with current observations of the cosmological constant and density of the universe.New gravity particleIn physical terms, the model describes the universe as being filled with a quantum fluid. The scientists propose that this fluid might be composed of gravitons—hypothetical massless particles that mediate the force of gravity. If they exist, gravitons are thought to play a key role in a theory of quantum gravity.In a related paper, Das and another collaborator, Rajat Bhaduri of McMaster University, Canada, have lent further credence to this model. They show that gravitons can form a Bose-Einstein condensate (named after Einstein and another Indian physicist, Satyendranath Bose) at temperatures that were present in the universe at all epochs. Motivated by the model’s potential to resolve the Big Bang singularity and account for dark matter and dark energy, the physicists plan to analyze their model more rigorously in the future. Their future work includes redoing their study while taking into account small inhomogeneous and anisotropic perturbations, but they do not expect small perturbations to significantly affect the results.”It is satisfying to note that such straightforward corrections can potentially resolve so many issues at once,” Das said. (Phys.org) —The universe may have existed forever, according to a new model that applies quantum correction terms to complement Einstein’s theory of general relativity. The model may also account for dark matter and dark energy, resolving multiple problems at once. Explore further The widely accepted age of the universe, as estimated by general relativity, is 13.8 billion years. In the beginning, everything in existence is thought to have occupied a single infinitely dense point, or singularity. Only after this point began to expand in a “Big Bang” did the universe officially begin.Although the Big Bang singularity arises directly and unavoidably from the mathematics of general relativity, some scientists see it as problematic because the math can explain only what happened immediately after—not at or before—the singularity. “The Big Bang singularity is the most serious problem of general relativity because the laws of physics appear to break down there,” Ahmed Farag Ali at Benha University and the Zewail City of Science and Technology, both in Egypt, told Phys.org.Ali and coauthor Saurya Das at the University of Lethbridge in Alberta, Canada, have shown in a paper published in Physics Letters B that the Big Bang singularity can be resolved by their new model in which the universe has no beginning and no end. Old ideas revisitedThe physicists emphasize that their quantum correction terms are not applied ad hoc in an attempt to specifically eliminate the Big Bang singularity. Their work is based on ideas by the theoretical physicist David Bohm, who is also known for his contributions to the philosophy of physics. Starting in the 1950s, Bohm explored replacing classical geodesics (the shortest path between two points on a curved surface) with quantum trajectories. In their paper, Ali and Das applied these Bohmian trajectories to an equation developed in the 1950s by physicist Amal Kumar Raychaudhuri at Presidency University in Kolkata, India. Raychaudhuri was also Das’s teacher when he was an undergraduate student of that institution in the ’90s. Using the quantum-corrected Raychaudhuri equation, Ali and Das derived quantum-corrected Friedmann equations, which describe the expansion and evolution of universe (including the Big Bang) within the context of general relativity. Although it’s not a true theory of quantum gravity, the model does contain elements from both quantum theory and general relativity. Ali and Das also expect their results to hold even if and when a full theory of quantum gravity is formulated. Journal information: Physics Letters B This is an artist’s concept of the metric expansion of space, where space (including hypothetical non-observable portions of the universe) is represented at each time by the circular sections. Note on the left the dramatic expansion (not to scale) occurring in the inflationary epoch, and at the center the expansion acceleration. The scheme is decorated with WMAP images on the left and with the representation of stars at the appropriate level of development. Credit: NASA
© 2015 Phys.org At the bottom of the 2 meter deep pit, the researchers report, were the scattered pieces and bits of hand bones, along with seven human arms, all from the left side of the body. On top of those were piled the full skeletal remains of one woman, two men and four children. Just one of the skeletons had an arm missing—one of the males, but it was not yet known if one of the arms underneath was his. The condition of the skeletons, the team suggests, indicates that the bones once belonged to people who were killed in some type of warfare—there was damage that appeared inflicted by axes or other such implements. Testing of the bones indicated they were all from a period between 5,500 and 6,500 years ago, putting them in the Neolithic period. A layer of sediment was on top of the skeletons and on top of that was the skeleton of another woman, whose body had clearly been put there long after the bones underneath.The team notes that there was also a piece of jewelry among the skeletons, an arrowhead, a pig jaw bone and the skeletons of two hares, which the group notes, might have simply fallen in the pit and died because they could not jump out. General view of pit 157 (a); and plan of the complete or almost complete bodies (b). Credit: Antiquity (2015). DOI: 10.15184/aqy.2015.180 Citation: Skeletons found in pit in France offer evidence of Neolithic warfare (2015, December 14) retrieved 18 August 2019 from https://phys.org/news/2015-12-skeletons-pit-france-evidence-neolithic.html Such pits were not unusual for the time the researchers point out, what is new is that the bones appear to have belonged to victims of warfare and that there was a collection of severed arms. The researchers suggest the severed arms might have been part of a trophy collection, though they note that it would represent the first evidence of such a practice for the people of that time period. Taken together, the evidence rules out the placement of the arm bones and skeletal remains as part of a funerary process, they add. More information: Fanny Chenal et al. A farewell to arms: a deposit of human limbs and bodies at Bergheim, France, c. 4000 BC, Antiquity (2015). DOI: 10.15184/aqy.2015.180AbstractBetween c. 4500 and 3500 BC, the deposition of human remains within circular pits was widespread throughout Central and Western Europe. Attempts at forming explanatory models for this practice have proven difficult due to the highly variable nature of these deposits. Recent excavations at Bergheim in Alsace have revealed a particularly unusual variant of this phenomenon featuring a number of amputated upper limbs. The evidence from this site challenges the simplicity of existing interpretations, and demands a more critical focus on the archaeological evidence for acts of systematic violence during this period. Examples of chop marks on left humeral shafts (scale-bar = 10mm; black bar = 5mm). Credit: Antiquity (2015). DOI: 10.15184/aqy.2015.180 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. (Phys.org)—A small team of researchers from several institutions in France, studying 6000 year-old skeletal remains found in a pit in eastern France is reporting that the remains included a bottom layer of just arm bones and a top layer consisting of the full skeletons of several adults and children. In their paper published in the journal Antiquity, the researchers describe the arrangement of the bones and their condition and offer some ideas regarding how the bones likely came to be in the pit. Explore further New research effort claims King Phillip II buried in Tomb I not Tomb II Journal information: Antiquity
Illustration of the new optical lens with a near-unity numerical aperture. Credit: Paniagua-Domínguez et al. ©2018 American Chemical Society 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 researchers, led by Arseniy Kuznetsov and Ramón Paniagua-Domínguez, at A*STAR (Agency for Science, Technology, and Research) and Nanyang Technological University, both in Singapore, have published a paper on the lens with near-unity numerical aperture in a recent issue of Nano Letters.Previously, the highest numerical aperture for a free-space lens was 0.95, which corresponds to a maximum collection angle of around 72°. Due to the way these lenses are made, they are also large and expensive, and so cannot be easily scaled down to work with very small systems.With its numerical aperture of 0.99, the new lens has both a higher resolution and a larger collection angle of 82°. The new lens is made of a metasurface rather than traditional lens materials. The metasurface consists of a pattern of subwavelength-scale structures and has an overall thickness of less than one wavelength of light, resulting in a small size that greatly expands its potential applications.”High-numerical aperture lenses/microscope objectives are major optical components that are widely used in microscopy, optical detection systems, optical lithography, quantum optics, etc.,” Kuznetsov told Phys.org. “Having a high numerical aperture is of primary importance in achieving a high resolution and high detection level of optical signals. Currently existing high-numerical-aperture lenses/microscope objectives are bulky and expensive. In this work, we showed that, using a new concept of metasurfaces based on dielectric nanoantennas, it is possible to design and realize flat optical components that can achieve a numerical aperture higher than all existing optical objectives, using just a device just a few hundred nanometers thick.”To demonstrate the advantages of the new lens, the researchers used it to image nitrogen-vacancy centers in diamond nanocrystals, which are several tens of nanometers in size. The images scanned by the new metalens revealed smaller spots compared to images scanned using commercial lenses with smaller numerical apertures, demonstrating the new lens’ higher resolution.The researchers expect that, in the future, the new lens may also be used to make improvements to photolithography, which is used to produce computer chips and other high-resolution devices. In addition, the new lens’ wide-angle collection is expected to increase the efficiency of single-photon emission processes, which are used in quantum optics systems.”We believe that this new concept will find broad applications in areas where detection of weak optical signals is important,” Kuznetsov said. “One example is in quantum optics, which deals with systems containing only single atoms or quantum emitters emitting light at the single-photon level. Such flat lenses not only allow for the detection of weak optical signals, but also can operate at extreme conditions of low temperatures and in vacuum, which is typical for quantum optics experiments.”Another important application direction could be in wearable and mobile photonic devices, where dense integration of high-efficiency optical components is required. For example, the lenses could find applications in mobile phone cameras and augmented reality glasses.” Nanostructured thin-films that can bend light by large angles could be a replacement for bulky glass optical components Explore further More information: Ramón Paniagua-Domínguez et al. “A Metalens with a Near-Unity Numerical Aperture.” Nano Letters 18, 2124–2132 (2018). DOI: 10.1021/acs.nanolett.8b00368 Researchers have designed an optical lens with the highest free-space numerical aperture to date, achieving a value of just under 1. As the numerical aperture indicates the highest possible resolution that a lens can attain, the new lens can focus light with unprecedented ability, as well as collect light from wide angles. These abilities should make the lens particularly useful for low-light applications, such as single-photon emission, which is often used in quantum optics systems. Journal information: Nano Letters Citation: Metalens achieves near-unity numerical aperture (2018, March 26) retrieved 18 August 2019 from https://phys.org/news/2018-03-metalens-near-unity-numerical-aperture.html © 2018 Phys.org
What role does literature play in contemporary societies? How do writers see their responsibilities vis-à-vis the public and, turning that over, how do we see writers? How has the written word adapted to its place among the growing pantheon of varied and addictive forms of cultural transmission? Join in the thinking brigade and get closer to these answers. Writers, Etc is a literary platform: a space where the written word gets primacy, where written ideas and their practitioners can interact with each other and the general public, coming together to ask pertinent questions and seek their answers to queries. Also Read – ‘Playing Jojo was emotionally exhausting’For their twenty second session, they have have Manu Joseph in conversation with Karthika V. K.Manu Joseph is the author of two novels — The Illicit Happiness of Other People, which was released in 2012, and Serious Men, his first novel, which won the PEN Open Book Award. It was one of Huffington Post’s 10 Best Books of 2010, and was shortlisted, among other awards, for the Man Asian Literary Prize and the Bollinger PG Wodehouse Prize for best comic fiction. Serious Men has been optioned for an Indian language film. Karthika V.K. started her career in publishing with Penguin Books India in 1996 after an M.Phil in English Literature from the University of Hyderabad. The aim is to encourage a discovery, unencumbered by genre, of all the written oeuvres, ranging from living legends to new and emerging talent.
Mother’s Day is the perfect occasion to show your mom how much you appreciate and value her. It is one such day when we get to say a ‘Big Thank You’ to our moms for all that they have done for us. It is a day when we want them to feel absolutely pampered and blessed. So this Mother’s Day, share priceless moments with your mum as The Imperial shower her with a delightful bouquet of offerings with special discounts and packages, celebrating 100 years of Mother’s Day across the restaurants. Also Read – ‘Playing Jojo was emotionally exhausting’Let her indulge in a fabulous brunch buffet at 1911 while you feel satiated that you are at the right place to make her spoilt for choice. High fashion cup cakes with personalized messages, home grown soil free 100 % organic micro greens combined with a health station filled with a fine selection of healthy juices extracted live, leave you asking for more and promise to excite you to take your pick on a blazing hot day. The lavish buffet has much more to offer. Uniquely designed chocolate nests with dainty eggs notify the genesis of life and pay an ode to motherhood while accentuating emotions and leaving the mouth-watering flavors in your mouth. Also Read – Leslie doing new comedy special with NetflixThe buffet would be thematically designed by our team of chefs with lots of candles for a feminine touch to celebrate the occasion and make all the mothers present, feel special. Chef’s special Amuse Busch offerings would be served complimentary to all guests at the buffet. So this is your time to give back to your mothers and make this day truly special and memorable for them. Enjoy this unique brunch with your mothers while we create lasting memories for you, one of it is the unusual souvenir from The Imperial – a specially designed Chocolate jewelry. The priceless memories get more enchanting with 20% discount on cakes and pastries at La Baguette, on High-Tea at the Atrium, on Diamond Magnetic Body Ritual – 90 mins (Spa Gift Voucher valid in SUFI room at The Imperial Salon for 1 month and not to be used in conjunctions with any other promotion), on Caviar Signature Hair Ritual – 90 mins, 20% discount off on Sufi products at The Imperial Spa and Salon and The Imperial Boutique.Where: The Imperial When: 11 May Timing: 12.30 – 3.30 pm Price: Rs 3200 + taxes
The Syrian Observatory for Human Rights, a monitoring group, said the strikes were on an office and a vehicle in Idlib province in northwest Syria, where last week the group routed Western-backed Syrian rebels.Residents said one strike targeted a car used by Nusra commanders, near an internet cafe in the Nusra-controlled town of Sarmada close to the Turkish border.A rebel from another Western-backed group operating in northern Syria confirmed the air strikes on the Nusra Front and hardline Islamist group Ahrar al-Sham near the border with Turkey, and said they took place at around 1 a.m.‘The strength of strikes and their accuracy confirms that they were carried out by the alliance,’ the rebel said, speaking on condition of anonymity.The Nusra Front vehicle struck in the attack had been carrying ammunition, he said. In neighbouring Harem, residents said at least four children had been killed and dozens injured in an attack they believed was launched by the coalition.The Observatory also reported the first air strikes against Ahrar al-Sham.Residents around the rebel-held Bab al-Hawa border crossing, a strategic gateway to Turkey, said a missile flattened the group’s headquarters nearby and killed Abu al-Nasr, the head of its arms procurement division.Rami Abdulrahman, head of the Observatory, said it marked the second time the Nusra Front had been hit in the U.S.-led campaign. The first was on Sept. 23, the first day of U.S. air strikes in Syria, which are part of Washington’s strategy to ‘degrade and destroy’ Islamic State.Nusra, which has been trying with allies to remove its name from the U.N. terrorist list, was taken by surprise when coalition warplanes bombed several of its positions then. Several commanders are believed to have been killed in the September strikes, including Kuwaiti-born Mohsin al-Fadhli — also known as Abu Asmaa al-Jazrawi — reputedly a former member of Osama bin Laden’s inner circle.Nusra Front last week seized control of areas of Idlib province from Western-backed rebel leader Jamal Maarouf, head of the Syria Revolutionaries’ Front in northern Syria, confiscating its weapons.
Kolkata: Police arrested four BJP workers in connection with the murder of Trinamool Congress worker Sheikh Dildar, who was shot dead on Monday during a ruckus that broke out over filing of nominations at Suri in Birbhum. Police arrested all four of them, after preliminary investigation revealed their involvement in the incident.The investigating officers came to know about their involvement in the incident, after speaking to some of the local people who had witnessed the chaos, in which several houses were damaged and some were even set on fire at Suri I block of Birbhum. Also Read – Heavy rain hits traffic, flightsActing on a tip off, police conducted a raid at Koridha in Suri and arrested Sheikh Safiul, Gautam Kora, Bablu Sheikh and Asit Sarkar. All four were produced before the court and they were remanded in custody of police for seven days. Police came to know from local people that all four were BJP workers.Sources said that police will try to know from them about others who are suspected to be involved in the incident. It may be recalled that senior Trinamool Congress leader and the state Urban Development and Municipal Affairs minister Firhad Hakim had said that BJP had brought in miscreants from the neighbouring state of Jharkhand, to foment trouble in the state ahead of the Panchayat polls. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedHe had said that the group of criminals that had created the chaos at Suri on Monday, which claimed the life of Dildar, was also behind the incidents at Mohammad Bazar and Nalhati. The police are trying to get hold of the “outsiders”, who were behind the Suri incident.The victim’s father had lodged a complaint with the police in this connection and the investigating officers spoke to the victim’s family members and friends to probe into the incident.The police are in search of the other accused who were involved in the incident and they are also speaking to the people who had seen the miscreants approaching the spot.