Month: August 2019 Page 1 of 15

Generally Speaking A Primer on General Relativity


Researchers Demonstrate Quantum Teleportation and Memory in Tandem

first_img Citation: Researchers Demonstrate Quantum Teleportation and Memory in Tandem (2008, January 30) retrieved 18 August 2019 from Explore further Coupling qubits to sound in a multimode cavity This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.center_img In research that may be a key step toward real-life quantum communication—the transmission of information using atoms, photons, or other quantum objects—researchers created an experiment in which a quantum bit of information is transported across a distance of seven meters and briefly stored in memory. This is the first time that both quantum memory and teleportation, as the information transfer is known, have been demonstrated in a single experiment. The experiment was performed by scientists from the University of Heidelberg in Germany, the University of Science and Technology of China, and the Atomic Institute of the Austrian Universities in Austria. The work was led by Prof. Jian-Wei Pan, a physicist at the University of Heidelberg.A quantum bit, or qubit, is the most basic unit of quantum information. It takes the form of a particular configuration, or “state,” of an atom or photon. Unlike a traditional computer bit, the most basic piece of information a computer can store, qubits represent the superposition of “0” and “1,” rather than either a 0 or 1. Additonally, a qubit cannot be copied in the traditional sense. It can only be transferred, without leaving any trace of the original.Quantum teleportation is the way to transfer an unknown quantum state to a distant location without getting any information about the state in the course of this transfer. When a qubit is teleported across a distance, the process is remarkable in that the sending and receiving qubits are not physically connected in any way, and do not “know” of each other’s existence. But through a quantum phenomenon called entanglement, one qubit is nonetheless able to assume the quantum state of another without physically interacting with it.In the present research, described in the January 20 online edition of Nature Physics, an unknown quantum state of a photonic qubit is transferred into quantum memory via teleportation and is stored by two clusters of rubidium atoms. Each cluster contains approximately one million atoms, collected by a magneto-optical trap. The teleported photonic qubit can be stored in memory and read out up to eight microseconds (millionths of a second) before the state is lost.“Such an interface to map the quantum states of photons onto the quantum states of matter, and to retrieve them without destroying the quantum character of the stored information, is an essential part of future quantum technologies,” said Pan to “It represents an important step towards efficient and scalable connection of quantum networks.”The quantum states carried by the photonic qubits are encoded in the photons’ polarization, or the alignment of the photons’ emitted electric fields. Each rubidium cluster encodes the information as a collective spin state over all of the electrons in the cluster. Like other unchangeable properties like mass and charge, spin, or angular momentum, is an intrinsic characteristic of an electron.First, the research group entangled the polarization state of the photons and the spin state of the atom clusters. This entanglement is then exploited to teleport the unknown state of a single photonic qubit onto an atomic qubit seven meters away. This is done by taking a simultaneous measurement of the entangled photons and the photon to be teleported. Taking that measurement entangles the two photons and projects the second photon’s state onto the atom clusters.This setup does have some serious problems. The quantum memory duration is very short and the probability that the photon will be teleported is low. Therefore, the researchers say that “significant improvements” need to be made before the scheme could be used in practical applications.Citation: Yu-Ao Chen, Shuai Chen, Zhen-Sheng Yuan, Bo Zhao, Chih-Sung Chuu, Jörg Schmiedmayer & Jian-Wei Pan Nature Physics advance online publication, 20 January 2008 (DOI:10.1038/nphys832).Copyright 2008 All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of read more

Scientists Measure Differences Between Normal and Cancer Cell Surfaces

first_img Molecular Imaging of Cells Likely with New Take on Atomic Force Microscopy Scanning electron microscope images of a cancerous (left) and normal cell, showing the differences in cell “brush.” Image courtesy Igor Sokolov. ( — Scientists know that cancerous cells and normal cells have different physical features, but the details of these differences, and why they occur, are not well understood. In a recent edition of Nature Nanotechnology, researchers report measurements of certain physical differences between the surfaces of normal and cancerous cells, suggesting a new way to characterize cancer cells and a possible route for detection. Explore further The group, composed of researchers from the Nanoengineering and Biotechnology Laboratories Center at Clarkson University, was studying human cervical cells. Led by Igor Sokolov, they focused on the cells’ surface features, including microridges and hair-like microvilii, which, perhaps acting like sensors, are one key way that the cells interact with their environment. Together, these features form a cell’s “brush.”They found that normal cervical cells tend to have a brush layer consisting of a single average length – 2.4 micrometers (millionths of a meter) – while the cancerous cells have mostly two typical lengths – 2.6 and 0.45 micrometers. Additionally, their analysis showed that the long cancer-cell brush is about half as dense as that of the normal-cell brush while the short cancer-cell brush is more than twice as dense.The group made these findings using an atomic force microscope (AFM), a high-resolution device that can resolve details down to a fraction of a nanometer. The AFM works by scanning a surface with a tiny cantilever, a beam supported on one end so that it can move up and down. In an AFM, the beam is tipped with a nanometer-scale curved needle often made of silicon or silicon nitride. When brought near a sample, forces between the needle tip and the surface cause the cantilever to deflect. When the entire surface is scanned, the result is a set of force data that represents a surface map of the sample. By analyzing the forces, researchers can recover the nature and type of surface interactions. In previous studies, scientists treated the surface of a cell as flat. In their work, the Clarkson researchers used various supporting techniques, including electron microscopy and confocal scanning laser microscopy, to show that the cell surface is sufficiently “brushy” to be visible in the AFM data. The researchers processed the forces using a “brush on soft surface” model, the type of model used to study polymer brushes (polymer chains tethered to a surface). Prior to this work, scientists had not looked at cell brush in this way.The AFM method has an edge over other microscopy techniques, such as electron microscopy, because it can work with viable cells, avoiding misrepresentations of the cell structure and saving time on sample preparation.More information: Nature Nanotechnology advance online publication 12 April 2009, DOI:10.1038/nnano.2009.77© 2009 Citation: Scientists Measure Differences Between Normal and Cancer Cell Surfaces (2009, May 5) retrieved 18 August 2019 from 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

Lightbeam from Mozilla shines light on online tracking

first_img Firefox has Click-to-Play cure for plugin plague More information: Explore further Citation: Lightbeam from Mozilla shines light on online tracking (2013, October 26) retrieved 18 August 2019 from Mozilla is now announcing a way to see who is watching you with its release of an add-on called Lightbeam. This is a Firefox add-on that will help Firefox users to both see and understand who is behind the data-tracking curtain. Announced Friday by Mozilla, the software community behind the Firefox browser, the plug-in is to show how one’s Internet browsing is being monitored. You can stop Lightbeam at any time by disabling it or uninstalling the add-on. Your Lightbeam data can be easily saved or deleted. Mozilla’s team points out that the “bad” in tracking lies in our lack of awareness of who is tracking and why. “Not all tracking is bad. Many services rely on user data to provide relevant content and enhance your online experience. But tracking can happen without the user’s knowledge,” according to Mozilla. “It should be you who decides when, how and if you want your browsing data to be shared. We recognize the importance of transparency and our mission is all about empowering users—both with tools and information.”Once the curtain is lifted, the Mozilla idea is that the user can make better, informed decisions about protecting privacy. Lightbeam reveals the parts of tracking that are not transparent to the average user. Viewers get to see third-party sites that one interacts with on the Web. Lightbeam shows relationships between these third parties and the sites you visit, relationships which one may not have been aware.Lightbeam comes to users via a download produced by Mozilla. The browser extension can create a real-time graph of all of the tracking cookies being deposited on your browser in your daily travels across sites. The add-on has three graphic representations, Graph, Clock and List. The Graph view is a visualization of every site you visit and third-party requests made from your browser. The Clock view shows connections over a 24-hour period. The List view has options for zooming in.Meantime, Mozilla is asking users’ help so that they can learn something too. Users can contribute their data to Mozilla’s Lightbeam database, a central open database showing how first- and third-party sites are connected to each other. Mozilla said, “Data from Lightbeam can help us and others to understand third party relationships on the web and promote further research in the field of online tracking and privacy.”The user also has the opportunity to disable crowdsourcing, however. The user can turn it off at any time. Lightbeam has its own “Privacy Notice,” in which Mozilla says, ” If you choose to send Lightbeam data to Mozilla (that’s us), our privacy policy describes how we handle that data.” The code for Lightbeam has been posted to Github. Lightbeam was funded by a grant from the Ford Foundation and the Natural Sciences and Engineering Research Council. Lightbeam was also helped by students at the Emily Carr University of Art and Design, in implementing visualizations for the add-on.last_img read more

Models suggest little brown bats more susceptible to fungus than bigger bats

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. Big eared townsend bat (Corynorhinus townsendii) Credit: Public Domain Journal information: Science Advances Citation: Models suggest little brown bats more susceptible to fungus than bigger bats (2016, February 1) retrieved 18 August 2019 from Explore further More information: D. T. S. Hayman et al. Environment, host, and fungal traits predict continental-scale white-nose syndrome in bats, Science Advances (2016). DOI: 10.1126/sciadv.1500831center_img © 2016 (—A team of researchers with members from several institutions in New Zealand and the U.S. has found, via modeling, that little brown bats in North America are likely more susceptible to dying due to a certain fungal infection than bigger brown bats, due to their size and habitat. The team has published their results in the journal Science Advances. Scientists and environmentalists alike have become concerned as the number of little brown bats in North America dying due to a fungal infection known as white-nose syndrome, has climbed into the millions. The fungus attacks the facial skin while the bats are hibernating, causing them to wake from hibernation early—that in turn causes them to die from exposure due to early expenditure of energy reserves. Prior studies have shown that other bats in North America and Europe are not harmed by the fungus and that has led to this newest effort to find out why there is such a stark difference between species.To learn more, the researchers conducted simulations to better understand the conditions that lead to fungal growth and then developed models based on the simulations they ran. Next they built models that mimicked the energy requirements of hibernating bats, taking into account the energy needs for the little brown bats, big brown bats, and also their European cousins, serotine and greater mouse-eared bats. They also noted that white-nose syndrome is relatively new to North America—prior studies have indicated the fungus migrated from Europe.In studying the results offered by all of the models, the researchers found that the energy requirements of hibernating bats varied by species as did metabolic rates, and that both were related to size. They also found that the fungus showed faster growth in areas of high humidity. The team also noted that the little brown bats, besides being smaller than all the others under study, also tended to hibernate in more humid parts of the country.Taken together, the data from the models suggests that it is likely the reason that little brown bats are more susceptible to dying from the fungus is because of their smaller size and because they hibernate in areas where the fungus grows faster. The team also suggests that European bats may have evolved traits that help them fight off the fungus—over their much longer history with the disease. Explaining species differences in bat mortality from white-nose syndromelast_img read more

When art meets Heritage

What happens when art meets heritage? The Ananya Dance Festival will bring you the answer. One of the most awaited classical dance festivals, it features specially designed group choreographs that light up the majestic Old Fort every year.The five-day classical dance extravaganza is in its 11th year. It is organised by the Department of Art, Culture, Languages of the Government of Delhi and Seher in association with Archaeological Survey of India [ASI], which celebrates its 150 years. Also Read – ‘Playing Jojo was emotionally exhausting’‘Ananya is an attempt to popularise the Indian classical arts among the youth. In this age of reality television, our heritage and culture needs to be repackaged innovatively and preserved amongst the future generations. The festival is one such attempt to showcase Indian classical dances in their purest form so that the traditional arts would reach out to more and more people of all ages and strata of society,’ said Sanjeev Bhargava, Creative Director, Ananya. Also Read – Leslie doing new comedy special with NetflixThe festival will start with an opening Bharatnatyam performance titled ‘Shiva Shakti’ based on Lord Shiva and his consort Parvathi [Shakti].‘Shiva Shakti is a dance centered on energy. It depicts the synergised power mingled with Panch Pota [five elements]. The 50 minute choreographed ballet will be put up by a troupe of 11 artistes,’ explained choreographer Saroja Vaidyanathan.Nearly hundred school children will also get a chance to interact with artistes at the festival. The workshop also aims to extend Ananya’s endeavour of introducing people to the possibilities of making a connection with traditional arts and architecture in their own lives and the potential of continuing to experiment with these in the contemporary era. ‘This time we have also introduced an outreach programme whose objective is two fold. One to foster a vision of taking Indian culture to the students. And the second is to present the creative industry – music, dance, theatre, art and related professions to be encouraged amongst the younger generation as viable alternative career options,’ added Bhargava.DETAILAt: Purana Qila [Old Fort]When: 6 October – 10 October Timings: 7 pm onwards  Entry: Free read more

Vintage santana at his best

Even at the age of 65 Carlos Santana can rock and play his uniquely soulful guitar as enigmatically and with as much fervor as he did in Woodstock of 1969. With his tight band comprising of a strong rhythm and horn section, the 10 Grammy winner was a treat for all the rock fans at the F1 Rocks concert at Galgotia University grounds last Sunday. The concert was presented by Vladivar and produced by DNA Networks.The repertoire was a collection of his greatest hits but the fascinating quality Santana has that he can get together a completely new line up of backing musicians that deliver.  And deliver they did with powerhouse support. His current touring line-up includes Tony Lindsay on Vocals, Raul Rekow on Congas, Dennis Chambers on Drums, Karl Perrazzo on Percussions, Benjamin Rietveld on Bass and David Mathews on Keyboards. Also Read – ‘Playing Jojo was emotionally exhausting’Although this was Santana’s first outing in India he is no stranger to the country as he has been inspired by Indian spirituality in the past and even temporarily adopted the middle name of ‘Devadip’. In a press conference the previous evening he said that he used music to spread world peace and heal the planet and to come to India was to connect with spiritual principles whose awareness he imbibed in the sixties. He said they do what religion and politicians have failed to do and at the concert too he again reiterated that he brings the message of One Light, One Love and Peace. Also Read – Leslie doing new comedy special with NetflixA high point in the concert was with his wife Cindy Blackman on the drums. She is also an acclaimed jazz and rock drummer having toured with Lenny Kravitz and other jazz greats. She backed Santana playing his ever spiritually uplifting classic ‘Europa’ culminating in a dexterous drum solo. Santana was in his electrifying best in a mesmerizing lead solo in ‘Jingo’. Other memorable compositions rendered were ‘Evil Ways’, ‘Black Magic Woman’, ‘Oye Como Va’, ‘Smooth’ and the ever popular ‘Soul Sacrifice’ which included a medleys of his favourite riffs and even the James Bond Theme! The only composition that failed to inspire initially was ‘Game of Love’ as Tipriti of Soulmate who was invited on stage was not familiar with the song but Santana deserves praise for his magnanimity to encourage her. She however excelled in ‘Smooth’ as well as ‘Make Somebody Happy’ along with vocalist Tony Lindsay who himself is an 11 Grammy winner and has spent 20 years with Santana as a frontman.Soulmate were the opening act and set the mood with their great blues originals with Tipriti and her powerful vocals and Rudy on lead guitar. Rudy also presented his track ‘Moon Flower’ inspired by Santana’s ‘Europa’. read more

Asansol Durgapur Development Authority to launch app to pay off dues

first_imgKolkata: Asansol Durgapur Development Authority (ADDA) is all set to introduce an app to facilitate payment of dues by the residents, right through their android or iOS mobile phone. ADDA will soon be integrating all the offices and shops located on land under it for systematic mopping up of the rent dues. It may be mentioned that a new payment gateway service namely “ADDA online” was launched in July last year, so that residents could pay all sort of taxes online right from their home. In the second phase, ADDA will integrate shops and both government and private offices that are entitled to pay rent to it for being situated on its land. “Most of these businessmen would visit our office once in three months, collect details of payments and then clear the dues. Delayed payments have become a cause of worry. Hence, we have decided to launch an app ensuring on-time payments. They will receive the details of their payment dues by 5th of every month and have to clear off the dues by the end of the month. They will have deposit the amount in an account of a private bank with which we have tied up for this purpose,” Arun Prasad, CEO of ADDA said adding that they are in talks with a couple of nationalised banks too in this regard. Since its inception, ADDA, through its online payment gateway, has earned revenue of Rs 11 crore with more than 3,000 customers being registered. The payment gateway was devised for collection of various fees like development charges, water charges, mortgage fees, transfer fees, ground rent among others. Presently, payment for as many as nineteen fees can be done through this portal. With the integration of shops and offices, ADDA will be earning at least Rs 3 crore more. Also Read – Heavy rain hits traffic, flights”The manual system to pay fees took a lot of time in processing and reflecting in our system. However, through this app-based online mode of payment, it will get processed immediately. Most importantly, residents do not have to take any hassle of traveling all the way to our office for payments,” chairman of ADDA Tapas Banerjee said. The app-based service will be launched in July when ADDA will observe the first anniversary of its online payment system. ADDA covers an extensive area of 1603 square km comprising two municipal corporations and eight development blocks.last_img read more

South Kolkata set to entice pandalhoppers with plethora of exciting themes

first_imgKolkata: The stage is set for pandal-hopping with the pleasant sky and forecast of no further rain. The Pujas in South Kolkata and Southwest Kolkata have lined up a number of innovative themes to attract the revellers.Mudiali Club on S R Das Road has adopted the theme Mayer Aanchal. The blend of dokra with Banglar patachitra and collaboration between various folk and tribal art forms from Bengal will come alive at the pandal. ‘Sankhas’ and ‘polas’ have been used to deck up the pandal. Also Read – Rain batters Kolkata, cripples normal lifeThe Shibmandir Club on Lake Temple Road is following the theme Maatir Taney Mayer Kache Phera. The jungles are getting depleting with rapid urbanisation. However, people should not forget their roots. The new generation settled abroad or outside the state should return to their roots, which is the message being reciprocated through the theme.Naktala Udayan Sangha is delivering the message that moments are fleeting and cannot be captured, through its theme Kal (Time). Meanwhile, the famous Suruchi Sangha is celebrating mother and soil together through their theme. Flowers and earthen pots in various shapes and shades have been used for pandal decoration. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedBhowanipore Swadhin Sangha acknowledges the contribution of the Santhals in the freedom struggle of the country, through its theme of Joy Jitkaur Deban Mena (Say we shall overcome), which is based on a Santhali poem penned by Chief Minister Mamata Banerjee. Hogla leaves, barks of trees, leaves of maize, earthen pots and oil lamps have been used to decorate the pandal. Santhal adivasis will be present in the pandal with their typical musical instruments like dhamsa and madol, for entertaining pandal-hoppers. Badamtala Ashar Sangha at Rashbehari Crossing speaks for equal opportunity and equality for women through its theme Sab Charitra Kalpanik. 66 Palli on Nepal Bhattacharjee Street depicts the slow revival of taant and the turnaround of the weavers thorough their theme Taant: Bengal’s own weave.Tridhara Sammilani near Deshapriya Park is trying to revive the lost traditions of Bengal through the theme Prakriti Ratan e Shajabo Joton e. The aim is to familiarise generation Y with the clay and jute artisans of the state, whose prowess remains unacknowledged in this mechanised world.Chetla Agrani is portraying the emptiness experienced after loss through its theme Bisharjan. A palatial building has been erected for people to understand the futility of existence, along with a pond in front of the idol where visitors will see the reflection of Devi Durga. The pond would serve as a symbol where people can shed their sins.Santoshpur Lake Pally between Sukanta Setu and EM Bypass has the theme Maayer Heshel. The ingredients used in the kitchen to prepare meals have been used to decorate the pandal. Six tonnes of turmeric has been used for the same. Behala Natun Dal appeals to the children through their theme to feel the happiness of nature and break the shackles of the digital world in which they are engrossed.last_img read more

Back To Basics

first_imgAfter over-the-top dramas and slick urban stories, Hindi cinema is drawing inspiration from small-town India.Hindi cinema is fast evolving even as the industry grapples with keeping its finger on the pulse of changing audience tastes. Despite this uncertainty, one thing’s certain – larger-than-life dramas that inspired flights of fantasy in the audience are passe. Hindi movies are no longer aspirational, at least, not in the traditional sense of the term. Also Read – Add new books to your shelfSo, out with dream sequences in foreign locations and uber-cool settings as shown in films like Student Of The Year, Jab We Met, 2 States, 3 Idiots, OK Jaanu and many others. It seems Dangal, which released in December 2016, was a turning point. The film seems to have struck a desi chord and set off a trend where stories that are grounded and simple in terms of their setting are capturing the audience’s hearts. Take a look at the success stories that released this year and their performance at the ticket counter. Also Read – Over 2 hours screen time daily will make your kids impulsiveThe year 2017 started with two superstars, Shah Rukh Khan and Hrithik Roshan, coming out with decently successful films like Raees and Kaabil. Both films were not only set against the most basic backdrops but also presented heroes that the audience could easily relate to. These two movies were followed by films like Jolly LLB 2, Badrinath Ki Dulhania, Tubelight, Hindi Medium, Toilet – Ek Prem Katha, Bareilly Ki Barfi, Shubh Mangal Saavdhan and several others. Interestingly, while almost every filmmaker is trying to elbow their way to the `100-crore club, the top four films in the `300-crore club – Salman Khan’s Bajrangi Bhaijaan and Sultan and Aamir Khan’s PK and Dangal, featured somewhat rustic concepts.The recent line-up of films makes one wonder whether there is a deliberate shift towards cinema that connects with the Indian audience at a basic level. Or is it pure coincidence that we have a slew of ‘grounded scripts’ making their way to the silver screen in quick succession?To shed some light on this, we spoke to experts from the industry. Here’s what they had to say:AANAND L RAI, PRODUCER-DIRECTOR I have never deliberately placed a film in a rural setting; it has happened naturally. I have made no attempt to ‘Indianise’ a storyline to make it more appealing. It is the world in which the story is set that attracts me. Whenever one forces something, it is bound to backfire. This year, people have been connecting with ethnic storylines and things have been flowing in that direction naturally. But we have to be careful not to push too much in that direction.BHUSHAN KUMAR, PRODUCERMany of our current films have been shot at beautiful locations in our country. The location of a story in our Hindi films usually turns out to be a character in the film. So, if you want your film to look convincing, it is important to shoot within the country. It helps the audience connect with the film easily.JAYANTILAL GADA, PRODUCER This is not the first time films are being shot in India; we shoot overseas only when we are offered tax benefits. It majorly depends on the script of the film. Last year, we had a lot of films that were shot in India but if the story requires the film to have a foreign country as its backdrop, we go for it. Nowadays, audiences are accepting good scripts. It is more about ‘film following’ than ‘fan following’. People are looking for content. Films like Baahubali have proved that people will watch a film only if it has strong content. No one knew who Prabhas was in other parts of the country before this film released. Recently, Hindi Medium and Bareilly Ki Barfi have made a mark.SUBHASH GHAI, DIRECTOR I have written and directed 19 movies, of which only four movies were shot abroad. Pardes, Taal, Yaadien and Yuvraaj were films where locations were the part of the stories. I prefer to shoot in India as we tell stories of Indian people. Also, we know these people who are connected with their roots. The fascination for foreign locations is just a personal fascination; it is no longer a fascination with the audience, with social media growing.NITESH TIWARI, DIRECTOR For me, it is always the story and the characters that should dictate the location and not vice versa. If the story doesn’t really demand a particular location, then there is merit in setting it up in a location that allows the characters to flourish and the story to be told more interestingly. In that case, small – or mid-town India is getting chosen more often now because it has a distinct and charming appeal that people haven’t experienced much. NIKKHIL ADVANI, DIRECTOR / PRODUCER I think as filmmakers we still do not know what will work but a lot of us have finally begun looking for inspiration from within India. I don’t think it’s only about desi versus foreign, even in Baazaar, we are making a film about India, about Mumbai and power, money, rules that are always broken. Once again, as filmmakers, we chose to take inspiration from real life incidents that have rocked the financial markets.ANUBHAV SINHA, DIRECTOR / PRODUCER That’s the real India. What connects with the audience is a good story. It’s true that more films are being shot within India. There’s a bunch of new filmmakers who are setting their films in India. People are identifying with those stories more and more because those films are about our problems, our celebrations. So they are more rooted in our society and that is why they are connecting with people better. I have only shot Thathastu in India. Most of my movies have been shot abroad. And I am shooting in India next month. The reason is that I got a little tired of stories that were set abroad. So it happened organically. BOIlast_img

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