Fall Into A Black Hole At The Speed Of Light With New

first_img Play Free fall towards the black hole. Video: Thomas Müller, Daniel Weiskopf As you look into the dark boundary of the hole, or the event horizon, you can see that the stars change colors, appearing redder, as the energy is sapped out of the star’s photons passing near the event horizon. But if you freefall towards the black hole, which the simulator allows you to do, the stars turn bluer due to the Doppler effect. Once in the center of the black hole, there is just the sight of a dazzlingly bright ring that appears to be circling the universe.The Müller/Weiskopf simulation program obtained its data from about 118,000 stars mapped by the European Space Agency’s Hipparcos satellite. Once you download the program, you can see the effects of a Schwarzchild black hole on any constellation or grouping of stars you like. But keep your CDs far away from your computer screen. PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Living fossils hold record of ‘supermassive’ kick PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Simulated view of a black hole in front of the Large Magellanic Cloud. The ratio between the black hole Schwarzschild radius and the observer distance to it is 1:9. Of note is the gravitational lensing effect known as an Einstein ring, which produces a set of two fairly bright and large but highly distorted images of the Cloud as compared to its actual angular size. (Image: Wikipedia) Explore further Not too many of us have actually seen a black hole, but Thomas Müller, physics student, and Daniel Weiskopf, computer science professor, at the University of Stuttgart, have programmed a vision for us. With their simulation of a black hole in space, you can really imagine what it would be like to be in the pull of one.A black hole occurs from the huge gravitational force of an exploding star. The force is so strong and dense that nothing can escape it, not even light. In fact, the enormous gravitational pull of the black hole would seem to displace the surrounding stars, creating dynamic and dramatic changes in, let’s say, a constellation. This effect is explained by the Schwarzchild black hole. The Müller/Weiskopf simulation, detailed in the February 2010 issue of the American Journal of Physics, shows what happens to stars as they approach the black hole. In the video below, you can see the large stars of the constellation Orion seemingly split into two, mirror images of each other on opposite sides of the black hole. More information: — American Journal of Physics paper: scitation.aip.org/getabs/servl … vips&gifs=yes&ref=no– Thomas Müller page: www.vis.uni-stuttgart.de/~muelleta/IntBH/– New Scientist www.newscientist.com/article/d … ss&nsref=online-news Play In this video an observer rotates around the Schwarzschild black hole. Video: Thomas Müller, Daniel Weiskopf (PhysOrg.com) — Black holes are my constant companions, at least in my imagination. Starting back a couple of decades ago, two sets of basketball tickets disappeared into one of them, and since then a pair of ski gloves, a gold ring, and more CD’s than I can count were sucked out of my hands in the same way. © 2010 PhysOrg.com Citation: Fall Into A Black Hole At The Speed Of Light With New Simulator (2010, February 10) retrieved 18 August 2019 from https://phys.org/news/2010-02-fall-black-hole-simulator.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.last_img read more

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Physicists seek to quantify macroscopic quantum states

first_img(PhysOrg.com) — “Scientists have been interested in generating and observing macroscopic quantum superpositions in order to test quantum mechanics at the macroscopic scale,” physicist Hyunseok Jeong of Seoul National University in Seoul, South Korea, told PhysOrg.com. “There have been many papers in which the authors claim to have generated mesoscopic or macroscopic superpositions, often called ‘Schrodinger cat states.’ However, quoting A. J. Leggett in 2002, a question from the theoretical side is ‘What is the correct measure of “Schrodinger’s-cattiness”?’ It has been considered difficult to answer this question with a general measure, and the answer has remained to be ‘very much a matter of personal taste,’ quoting Leggett again. Our work now provides scientists with a theoretical tool to quantify and compare different types of quantum superpositions. This can be a step toward rigorous tests of quantum mechanics in a macroscopic limit.” Citation: Physicists seek to quantify macroscopic quantum states (2011, June 29) retrieved 18 August 2019 from https://phys.org/news/2011-06-physicists-quantify-macroscopic-quantum-states.html Can we detect quantum behaviour in viruses? Explore further As the scientists explained, a macroscopic quantum superposition has two (or more) well-separated peaks and some oscillating patterns between them in phase space. The scientists showed that the frequency of these interference fringes reflects the size of the superposition, while the magnitude of the interference fringes relates to the degree of genuine superposition. So using this method, the scientists could simultaneously quantify both the size of the system and its degree of quantum coherence. The method also works for superpositions that are fully or partially decoherent, which occurs when macroscopic superpositions lose quantum coherence due to interactions with their environments.Overall, the method doesn’t provide a specific threshold beyond which a superposition is “macroscopic,” but instead it provides a continuous scale to compare sizes of different superpositions. The scientists found that the method also agrees with a previous method (Dür, et al.) designed to measure a specific type of state. But with its advantage of being able to measure any state represented in phase space, the new method could be widely useful for future studies on macroscopic quantum systems.“In [this] paper, the focus was pretty much on continuous-variable states, which mainly relates to light fields,” Jeong said. “However, due to the intrinsic generality of our measure, it should be quite straightforward to extend it to various discrete-variable systems such as atomic states. I will then apply this measure (I would call it ‘superness,’ thanks to Dr. Jonas Neergaard-Nielsen) to various ‘claimed’ macroscopic superpositions. I believe that such investigations will reveal ‘where we are’ regarding macroscopic tests of quantum theory.” More information: Chang-Woo Lee and Hyunseok Jeong. “Quantification of Macroscopic Quantum Superpositions within Phase Space.” Physical Review Letters 106, 220401 (2011). DOI: 10.1103/PhysRevLett.106.220401 Copyright 2011 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Jeong and his coauthor Chang-Woo Lee, also of Seoul National University, have published their study on the quantification of macroscopic quantum superpositions in a recent issue of Physical Review Letters. Having a way to quantitatively compare different types of states in terms of their size and their degree of quantum coherence will be very useful for theoretical and experimental studies on macroscopic quantum phenomena, generation of nonclassical states, and the decoherence of quantum states within various physical systems.As the scientists wrote in their study, quantum superposition is often considered the most crucial feature of quantum mechanics. In quantum mechanics, particles can exist in one or more energy levels. When a particle exists in just one energy level, it’s in a well-defined energy state. But when a particle exists in two or more different energy levels at once, it’s in a superposition of energy states. The most well-known example of superposition is Schrödinger’s cat, which is locked in a box with the possibility of being poisoned. Until an observer looks inside the box, the cat is considered to be both dead and alive at the same time, according to quantum mechanics.Physicists have observed superposition in many experiments with microscopic systems. However, the question of whether a truly macroscopic system – such as a cat – can exist in a quantum superposition is much more complicated.For the past 10 years or so, physicists have been proposing various ways to define or measure macroscopic quantum superpositions. Many of these proposals start by considering the number of particles or the distance between component states involved in the superposition. Although this approach sounds reasonable, the proposals have run into problems – particularly, they have not been general enough to be applied to different types of states.The biggest advantage of Lee and Jeong’s method of measuring macroscopic quantum superpositions is its generality, which enables it to be applied to many different types of states and allows for direct comparison between them. The method is based on the quantum interference of a given state in phase space, which is the space in which all possible states of a system are represented. 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

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Controlling nanoclusters with surface defects could lead to construction of nanodevices w

first_img The researchers, Teemu Hynninen, et al., from institutes in Finland and France, have published their study on the manipulation of gold nanoclusters using defects in an NaCl surface in a recent issue of Scientific Reports.In 1990, researchers first demonstrated that they could move single atoms by pushing them with the tip of a scanning tunneling microscope (STM). But while moving single atoms may be of great fundamental interest, it’s actually more practical to be able to move somewhat larger atomic clusters.”For many applications—such as catalysis—clusters or molecules are more relevant than single atoms, so it makes sense to operate on larger units than just atoms,” Hynninen, at Aalto University and the Tampere University of Technology in Finland, told Phys.org. “Also, if you want to build something of considerable size (on the nanoscale) it’s easier if you can use bigger building blocks. Of course, you would never produce anything with nanomanipulation—it’s much too inefficient. Nanomanipulation is a technology with which one can design structures with absolute precision for further studies.”Over the past several years, scientists have demonstrated how to move atomic clusters using a non-contact atomic force microscope (nc-AFM), which works due to a repulsive interaction that arises between the cluster and tip when they’re only a few angstroms apart. Generally, atomic clusters can be moved by a non-contact tip in two ways: by lowering the tip from directly above the cluster (which the researchers here call “kicking”), and by moving the tip toward the cluster from the side (which the researchers here call “sliding”). Video abstract for “Defect mediated manipulation of nanoclusters on an insulator.” Credit: Teemu Hynninen, et al. The researchers found that gold clusters bond to Na ion vacancies and Cl ion vacancies in different ways. A cluster bonds to an Na ion vacancy along one of the cluster’s edges so that it orients itself with a nearby row of Cl ions. The cluster’s energetically favored mode of movement is to slide along the row of Cl ions in a straight line, parallel to the bonded edge. In contrast, a cluster bonds to a Cl ion vacancy at one of the cluster’s corners rather than an edge. This cluster prefers to move by pivoting around its bonded corner, as it constantly tries to reorient itself with neighboring ions. As a result, the cluster can move in a zig-zag path in any direction.When the researchers brought in an nc-AFM to scan the surface from the top and the side, they found that they could move 5-nm clusters of gold atoms (about 2000-2500 atoms) in different ways, depending on the type of defect to which the clusters were bonded. Knowing that Na ion vacancies are the dominant defect on a part of the substrate called step-edges, and Cl ion vacancies are more common on a part called the terrace, the researchers could attribute the different types of cluster movements to the different types of vacancies. Clusters on the step-edges always moved in a straight line in a particular direction, while clusters on the terrace could be easily moved in different directions. The defects’ contributions to the movement of the clusters offer scientists an additional way to manipulate clusters using an nc-AFM. The researchers hope that this mechanism can be exploited to build nanostructures and, in a reverse process, the clusters’ movements could be used to help identify the types of defects on a substrate. As the researchers explained, it may be possible to control the defects on substrates, and thereby control the movement of clusters.”Practically all materials have defects like vacancies, and often they also appear on the surfaces,” Hynninen said. “Defects can be created or removed for instance by irradiation or heat treatment. A common example is gemstone irradiation, where the color of gems is controlled by exposing them to irradiation. The radiation creates defects in the crystals and these affect the optical properties of the gems. In principle, one could use such methods to control the defects and thus movement of clusters. The exact way how this would work depends on the substrate and clusters.” Silver-rich lumps: Large cluster complexes with almost 500 silver atoms Journal information: Scientific Reports Citation: Controlling nanoclusters with surface defects could lead to construction of nanodevices (w/ Video) (2013, February 27) retrieved 18 August 2019 from https://phys.org/news/2013-02-nanoclusters-surface-defects-nanodevices-video.html More information: Teemu Hynninen, et al. “Defect mediated manipulation of nanoclusters on an insulator.” Scientific Reports. DOI: 10.1038/srep01270 (Phys.org)—In nanoscience, the ultimate goal is to design better materials and devices by controlling the positions of the atoms, molecules, and molecular clusters on a substrate with exact precision. In a new study, researchers have developed a new method for controlling the movements and positions of clusters of gold atoms on an insulating substrate not only by using the tip of a microscope as is usually done, but also by using atom-sized defects in the substrate itself. The additional level of control offered by the defects could prove useful for constructing future nanodevices and nanomachines.center_img Although kicking and sliding provide proven ways to move atomic clusters, both methods are limited by the tip’s scanning direction. That is, the direction of the cluster’s movement depends on the position of the tip.In the new study, the scientists demonstrated that, by taking advantage of the natural defects in the substrate on which the atoms lie, they can move atomic clusters in a way that is not completely constrained by the tip’s position. As the researchers explain in their paper and in the YouTube video, an NaCl substrate can have vacancy defects due to missing Na ions and Cl ions. When the researchers deposited single neutral gold atoms onto the insulating NaCl substrate, they observed that the vacancies act as nucleation sites that allow the gold atoms and clusters to bond to the substrate. Explore further © 2013 Phys.org Illustration of an atomic force microscope tip “kicking” a gold cluster of atoms across a substrate. Credit: Teemu Hynninen, et al. 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

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Dream Downtown

first_imgLiving in the metro comes with its own suite of benefits – one of which is the option of living in luxury homes or dreaming of buying one. The Sikka group has realized this dream for many families having made its foray in the luxury real estate business. On 26 July, the Sikka group launched their upcoming dream project at Noida, Sikka the Downtown, unveiled by Anil Kapoor and Sonam Kapoor. The event was followed by a thundering performance by Honey Singh and Prachi Desai. Also Read – ‘Playing Jojo was emotionally exhausting’Friday evening became enthralling with the Sikka Group’s launch party of their new upcoming luxury homes project called Sikka the Downtown, Noida at Sector 98, Noida Expressway. The august presence of Gurinder Singh Sikka, Chairman and his two sons Harvinder Singh Sikka and Gurneet Singh Sikka, added color to the launch night.The Sikka Group  is a three decade old organization which was started in 1986 and now has a foothold is various fields of the Indian industries like Real Estate, Hospitality, Automobiles and Outdoor media decided to now amplify their presence and step into Luxury Real Estate in North India, Delhi and national capital region. Also Read – Leslie doing new comedy special with NetflixThe basic idea behind this dream project is to meet the burgeoning demand of luxury homes and real estate and to cater to young customers who travel frequently and aspire to own a home with rooms like luxurious hotels. The key highlights of the project are its central location, high-end retails spaces, corporate suites, branded residences and a luxurious 5 Star Hotel, to be managed by an international chain of hotels which is yet to be disclosed. The pricing for the homes starts from Rs 15000 per square foot approximately according to Piyush Sharma, Vice President of the firm. The land is acquired and the license and clearance is done for the land.Guests were entertained by a dance performance on top Bollywood item songs by Prachi Desai. It was followed by an equally breath taking performance by Honey Singh who sang all of his popular songs making the crowd dance to his music beats. The audiences were mesmerized by the performances and showed their enjoyment through the hoots and whistle while cheering encore! In the end, the audience went back dreaming of owning a home in Sikka – The Downtown, which for many, would probably be dream come true!last_img read more

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Different moods on canvas

first_imgThe Capital is hosting a group art show titled Simmer Show that displays paintings which are an amalgamation of abstract and easy to understand figurative themes. The show that kick started on 21 June displays works by artists – Pramod Ganpate, Krishnandu Porel, Kishore Roy, Madan Lal, Manoj aggarwal, Praveen Upadhye, Ashoke Acharyya and  Thitaikar Biswas. The artists use architecture, especially the ornate type,found in  Indian religious sites, temples and historical monuments as their principal subject. The usage of bright and beautiful colours not only gives an energetic touch to the work but at the same time is humble, pure and surreal. Aggarwal is a chronicler of society, who simply reproduces the body from the life, never really trying to cast it as a machine for survival. His subjects are human emblems of bare realities rather than any idealist’s imagination. The works that he’s exhibiting are a continuation of striking monochromatic drawings, and large oil on canvas paintings. The drawings have a specific rhythm, lyric and body language captured with great virtuosity, the high contrast arresting to the eye. The artist says, ‘I prefer my art works to stay close to reality and lay maximum impact on viewers mind from its first sight. What matters is how people interpret them’. Also Read – ‘Playing Jojo was emotionally exhausting’Porel employs a subtle interplay between light and darkness, dull and bright colours, to capture each mood he feels from the environment he is painting, and transfer it adeptly to his canvases. Even though the colours Porel uses are often gloomy and quiet greys and browns, there always seems to be a serene and calming light in the painting that strikes up a contrast and leaves viewers at peace. He says, ‘Every artist is an individual and has his own distinct form of expression which is what my paintings are all about’.Acharye noted, ‘For me abstraction holds a wide range to express oneself in true manner, for the artist as well as for the art lover’.When: On till 11 July Where: Gallery Pioneer, Lado sarai, MB RoadTIMING: 11 am till 7 pmlast_img read more

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South ahoy

first_imgAfter sampling the desi snacking joints of Connaught Place and Kamla Nagar in Central and North Delhi it’s time to move a south and get to know some eateries in the popular market of Lajpat Nagar that have been crowd favourites for ages and we quite recommend them too. Lajpath market, unlike other conventional shopping centers, offer almost everything for everybody – from street-side stalls selling clothes, foot-wear, accessories, bags, books, household items and more to up-market air-conditioned multi-level multi-brand outlets which cater to all the needs and wants of Delhiites of all classes and tastes. Also Read – ‘Playing Jojo was emotionally exhausting’A brief in-sight into some of the more popular eating outlets in Lajpat Nagar markets is given below to help make your next visit there more ‘tasteful’: GOLDEN FIESTA : This fast food shop in the Central Market, opened in 1981, is allegedly one of the first in Delhi to introduce standard Chinese fast-foods like Chow mien, Spring-rolls, etc. Apart from these Chinese staples, the outlet serves a wide range of soft drinks, ice creams and desi fast-foods like Gol-gappas and Aaloo Tikki. For the sake of variety and being a little health-conscious too, one can also order a freshly made foot long sandwiches. Also Read – Leslie doing new comedy special with NetflixYADAV JI KE RAAM LADDO: For more than 25 years, shoppers have enjoyed the truly desi treat of ‘Ram Laddoos’ or ‘Moong Dal ke Laddoo’ from a humble push-cart (rehdi). The popular stall is currently run by Yadav ji (who else?) who is continuing his father’s legacy. At Rs. 30/- a plate the little fried treats made basically of ‘moong dal’ are an ideal chatpata snack any time of the day.BABA CHAAT BHANDHAR: Next to Yadav Ji’s stall, Baba Chaat Bhandhar in Lajpat Nagar’s Central Market is well known for delicious Aaloo ki chaat, Tikki and Gol-gappas –all priced in range of Rs. 30/- to Rs. 40/-. These humble yet popular road-side street food eateries are spicing up the lives of shop-owners and visitors in the market for nearly 35 years now. AUNTY MOMO’S : Since 1989, a little stall, Momo’s Corner or more popularly known as Aunty’s Momos, has been seving the Chinese steamed treats to those less inclined towards our traditional fried snacks. As per legend the stall was started by a lady and hence the name Aunty’s Momos. You can ask anyone in or around the Lajpat Nagar market or anyone who frequents this area about the local more popular snacking joints and Aunty’s Momos is one of the first names you will be recommended.ASHOK TEA STALL: This small shop, located at entrance of Central Market, contrary to its name serves one of the best chilled lemon ‘masala’ drink to beat Delhi’s unbearable hot weather and in winter you try their specialty masala tea under 30-50rs.last_img read more

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8 arrested of a gang involved in 21 robberies

first_imgDelhi Police have arrested eight persons, who were involved in as many as 21 cases of burglaries in Delhi and NCR. All the accused are natives of the Araryam district in Bihar. On March 11, many complaints related to burglaries in Pratap Complex in Munirka were received. During a spot visit by police officials, several shops and offices were found to have been broken open, with mobile phones, laptops and other valuable articles stolen. “Evidences collected from the spot, including finger prints, CCTV footage and details obtained from CRO were analysed minutely but identification of criminals without any previous records became a humongous task,” a senior police official said.last_img read more

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Rajapaksa claims political witch hunt

first_imgP B Jayasundera, Rajapaksa’s top bureaucrat in the Finance Ministry during his nearly decade-long rule, was interrogated by police’s Financial Crime Investigation Unit (FCIU) Tuesday.”Dr Jayasundera was questioned Tuesday over the alleged wrong doings in the oil hedging transaction which had caused a loss of 200 million dollars to the government,” Police spokesman and Assistant Superintendent Ruwan Gunasekera said.On the same subject, Rajapaksa’s governor of the Central Bank Ajith Nivard Cabraal was also quizzed last week along with the then chief of the state petroleum entity Asantha de Mel.De Mel, a former Sri Lanka Test cricketer and former Chairman of Selectors, headed the Ceylon Petroleum Corporation under Rajapaksa.”What is happening Tuesday is a political witch hunt. They are taking revenge from innocent officials on false accusations,” Rajapaksa told a religious gathering yesterday at Bandaragama, south of here.Basil is wanted by the police over misappropriation of livelihood.last_img read more

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Truckers agitate as import duty hike cripples business in Hili border

first_imgBalurghat: Due to the sudden import duty hike on Indian goods in Bangladesh, business in the Hili border area has been badly hit for nearly a month. Official sources informed that the import duty has been hiked from 2 percent to 28 percent since June 7.Lorries loaded with goods have got stranded at the border since June 6 at Panama parking zone in Bangladesh. This has caused huge losses, said the exporters.Meanwhile, around 250 truck drivers and cleaners staged a demonstration, demanding immediate release of goods on Wednesday. According to the agitators, they have been facing a tough time due to the sharp fall in trade, following the recent hike. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed”The stock of food we have been carrying with us is nearly finished due to the stalemate. There is acute drinking water scarcity. Importers in Bangladesh have refused to unload goods, without imposing the new import duty. We are helpless now as without unloading the goods, we can’t return to the Indian side,” said lorry driver Pintu Urao.Sources said around 200 trucks have been stranded in Panama.President of truck owners’ association Kartik Saha said: “We have talked to the exporters and importers in Bangladesh to restore normalcy. The problem has risen due to the sudden hike in import duty. Bangladeshi importers have refused to unload Indian goods without imposing the new import duty. We have also requested them to talk to the Bangladesh government directly, to remove the stalemate. They have assured us that the problem will be resolved within July 12.”Sources said that the importers in Bangladesh had also appealed in court, challenging the decision of the government regarding the issue of increasing import duty.last_img read more

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Tea planters urge unions not to disrupt operations in Bengal

first_imgKolkata: Amid ongoing agitation in tea gardens of Dooars and Terai in West Bengal, planters on Tuesday appealed to workers’ unions not to resort to disruptive activities while discussions on minimum wages are on. “The unions have taken to agitation during the peak season. We appeal to them not to resort to disruptive activities… We feel it is unjustified as the issue is pending at the government level,” Indian Tea Association’s Secretary General Arijit Raha told reporters here. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed Regular gate meetings at the garden in Dooars and Terai during the morning hours since July 2 had resulted in production loss, he said. A July 23-25 strike notice has been given by the workers unions. “The government convened a meeting on July 4 in Siliguri and subsequently appealed to all unions not to resort to gate meetings or strike work since the issue of minimum wages is under discussion,” Raha said, adding that planters are concerned about the “adverse development”. Also Read – Naihati: 10 councillors return to TMC from BJP Tea production in June was down by 10 per cent, he said, adding that production in West Bengal fell by almost 9 per cent in 2018 as per ITA crop estimates. “Unless normal operations are restored, this will further bring down the production,” Raha said, adding that Darjeeling unions had fortunately decided not to take part in the proposed strike. In fact, the West Bengal government proposed an interim hike of Rs 17.50 to increase the remuneration from Rs 132.50 to Rs 150 with effect from January 1, 2018. “The state also introduced interim payment of compensation on account of savings on the procurement cost of foodgrains at the rate Rs 9 per day per worker from May 1, 2018. These have already been implemented by the managements,” Raha said. Usually, wage agreement for tea workers is executed for a three-year period and the last agreement had expired on March 31, 2017. According to Zia-Ul-Alam, Convenor of Joint Forum of Trade Unions, an umbrella organisation of trade unions working in the tea sector, and Citu’s General Secretary (tea industry), unions protested against the minuscule hike in minimum wages. As many as 10 rounds of discussions of the Minimum Wages Advisory Committee have been held so far but no decision had been forthcoming.last_img read more

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