Some particles are able to flow up small waterfalls physicists show

first_imgExperimental setup. As clean water is poured from the upper to the lower container through a horizontal channel, particles added to the surface of the lower container eventually ‘climb up the stream’ and contaminate the channel (as illustrated by the arrow). Image credit: arXiv:1105.2585v1 Explore further Citation: Some particles are able to flow up small waterfalls, physicists show (2011, May 18) retrieved 18 August 2019 from https://phys.org/news/2011-05-particles-small-waterfalls-physicists.html More information: Upstream contamination in water pouring, arXiv:1105.2585v1 [physics.flu-dyn] arxiv.org/abs/1105.2585AbstractWe report the observation of upstream transport of floating particles when clear water is poured on the surface of a flat water surface on which mate or chalk particles are sprinkled. As a result, particles originally located only at the surface of the lower container can contaminate the upper water source by “riding” on vorticial water currents. We speculate that Marangoni forces in combination with geometry-induced vortices may explain the observed phenomenon. Water running uphill a cooling idea 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. © 2010 PhysOrg.com With just a small bit of research, the team was able to show what seems to be counterintuitive; that it truly is possible for some particles (and some of the liquid itself) to travel up a very small waterfall and into the reservoir behind it. While most anyone that has observed moving water has likely noted the whirls and eddies that form when water tries to flow along or past obstacles, it’s difficult to imagine such counter-flows being created with sufficient force to actually push the fluid uphill. Althsuler et al. show that in fact, it can.To see what was going on, they used two lab containers; one to hold the room temperature water, the other to hold the chalk they used instead of mate leaf bits (figuring it would be much easier to follow with the naked eye). They then placed an open half-cylinder shaped channel between the two containers that would allow water to flow smoothly from the first container down the channel, where it would then drop into the second container. With this setup, they discovered that as the liquid came rushing down the channel, the main mass of water traveled down the center, creating vortices that caused small amounts of fluid to travel along the edges of the channel in the opposite direction, allowing the chalk to work its way up to the higher level container. But, they also discovered by varying the height of the channel, that it only occurred when the dropping distance was very slight; in this case, 1 centimeter, or less.As a result of this study, it’s likely that certain industrial processes might have to be modified to make certain unintentional contamination doesn’t occur that is currently being overlooked. Also, its likely future research on this phenomenon will need to be done to determine if other factors can affect the height of the fall or the amount of particulate that is able to travel uphill to another vessel. (PhysOrg.com) — In a paper published on arXiv, Cuban physicist Ernesto Althsuler and his team at the University of Havana, describe how they set out to reproduce a phenomenon they had observed while brewing the Argentinean drink mate, a type of tea. Althsuler noticed that after causing hot water to drop from one vessel down a very slight waterfall into another containing tea leaves, some of the leaf particulates managed to make their way back up the waterfall and into the hot water vessel. In their subsequent research, they discovered that a small counter-flow can come into existence in small drop waterfalls along the sides; enough to carry small particles.last_img read more

When will the torture end

first_imgEight minutes may not hold much importance to us but a child in India goes missing every eight minutes. Our country is widely recognized as having the world’s largest number of trafficking and slavery victims, many of whom are children. Exploitation and slavery in India includes sex trafficking, and multiple forms of slave labour. But India is not alone where children, women, and men are trafficked within or across a nation’s borders. Not My Life, a widely acclaimed film by Oscar nominee Robert Bilheimer on human trafficking discusses this issue very effectively. The documentary which is filmed on five continents in a dozen countries is a grim reminder of how human trafficking and slavery is growing rampantly and how we are not doing enough to curb the issue. Also Read – ‘Playing Jojo was emotionally exhausting’Not My Life is the first film to depict the cruel and dehumanizing practices of human trafficking and modern slavery on a global scale. It takes viewers into a world where millions of children are exploited, every day through labour, domestic servitude, begging, sex tourism, sexual violence, and child soldiering. Challenging though it may be, Not My Life’s message is ultimately one of hope. Victims of slavery can be set free and go on to live happy and productive lives. Also Read – Leslie doing new comedy special with NetflixAccording to Kailash Satyarthi of Bachpan Bachao Andolan, ‘Human memory is very short. We are hurt but what we very quickly forget. Indian children go missing in India every eight minutes. These children become slaves,  work in factories and in brothels, and they are numbered in millions.’  Commenting on the film Billheimer said, ‘This project is a labour of love. We kept asking, who will speak for those who cannot speak for themselves?  In the end we felt that making Not My Life was not only our job, but our mission, because far too much silence still surrounds this issue.’ The Director General of Doordarshan, Tripurari Sharan made the endeavour to take the film to the remotest corners of the country and overseas where it can be seen, so that it can create the right kind of impact about the horrors of human trafficking.  He said that the problem of human trafficking existed in at least 190 countries and the film had attempted to cover some of these including India. Doordarshan will telecast the 56-minute documentary dubbed in Hindi in its international première on 29 June at 9.30 pm.last_img read more

Varied colours of moods and moments

first_imgWe have our own ups and downs, happy and sorrow moments, rejections and acceptances, success and failures and we sway our moods with these expressions of life. Same is the case with an artist. It is the intensity of the situation that makes the artist play with the lines, apply colour to his art, give it a definite form and infuse life in it. Thus, the final outcome will be the projection of an artist’s expression which will be depicted in the work and that will give the canvas its moods and moments. Also Read – ‘Playing Jojo was emotionally exhausting’This is the reason why this exhibition is named as the Moods n Moments on Canvas. It’s a group exhibition of 12 eminent artists curated by Savita Agrawal, Director Shree Yash Art Gallery that opened on 8 October in the Capital. The participating artists are – Shranik Jain, Shyamal Mukherji, Ramesh Gorjala, Bhawna Bhanot, Nand Thakur, Harish Kumar, RC Bhawsar, S.D. Shrotriya, Prithvi Soni, Madan Lal, Darshan Sharma and  Savita Agrawal.The efforts put in by the artist to instill life in his creation are what make it desirable by the onlooker. The life line of an artist is his canvas and he works within its periphery. His imagination and the brush of an artist have the capacity to capture the picturesque moments that may be difficult to see otherwise. Also Read – Leslie doing new comedy special with NetflixPrithvi Soni from Mumbai skilfully depicts village life scenes with lively colours and forceful lines that the work and the characters of his picture look as if they are standing right in front of you. The use of earthen colours adds a traditional touch to his work.Nand Thakur , a young and aspiring artist, is also a professor in Shimla. His colours are very vibrant and he finds himself connected to nature always. There is a calm and sure way in his projection.When: On till 15 October Where: Shree Yash Art Gallery, Green Park Main Market Road Timing: 6 pmlast_img read more

Of sacred geometry and cosmic order

first_imgVictory, would be launched on January 4 (Sunday) at the exhibition. It describes the unique journey that she set upon in 1971. Intimate details are revealed of how discoveries were made that opened the New Way, her unique contribution to the world to higher knowledge. The Volume 1 of her book describes her astonishing breakthroughs into the heart of sacred number, geometry and cosmology.In January 1970, the Mother made the most significant breakthrough of the age. She entered the solar world and saw there a chamber which in sacred architecture encapsulated the entire process of supramentalisation for both individual and collectivity. The Mother drew up a plan of the chamber with very precise measurements for its construction in the physical world. This most extraordinary accomplishment ever recorded in the sacred sciences has remained unknown to the world for 44 years.The exhibition is focused on sacred geometry. Since the exhibits may appear too abstract for some, they would be placed side by side with images from the Puranic Age that encapsulate the same principles. The viewers would be offered an integral package – number, geometry, architecture – all grounded in Indian mythology. Such an integral approach to the sacred has not been attempted before.last_img read more

95 kg ganja seized in Bengal one arrested

first_imgKolkata: The Narcotics Control Bureau (NCB) seized 95 kilos of ganja (cannabis indica), meant to be smuggled to Bangladesh, from West Bengal’s Nadia district and arrested one person in this connection, an official said on Friday. “The NCB seized the ganja from the residence of Narabul Khan in Nadia district’s Narayanpur during a raid on Thursday. Khan has been arrested on the charge of illegal storage and supply of narcotic substance,” a senior NCB official said. “The seized ganja was procured from Odisha and was supposed to be smuggled to Bangladesh through Khan’s associates in Nadia’s Krishnanagar,” he said. Both the accused and the seized contraband were presented in the Krishnanagar court on Friday.last_img read more

Truck bombing at Baghdad market kills 67 IS claims blast

first_imgThe Islamic State group claimed responsibility for the blast, saying it targeted a gathering place of Shiites and vowed more attacks. The truck detonated in the Jameela market in the Iraqi capital’s crowded Sadr City neighbourhood shortly after dawn, according to two local police officers.They also said that at least 152 people were wounded in the attack. The market is the main center for produce and food sales in the Iraqi Capital.Residents of the Shiite community rushed to help the victims, carrying corpses in garbage bags and blankets, and sent the wounded to local hospitals in ambulances or personal cars. The blast incinerated much of the market, leaving charred wooden market stalls and scattering fruits and vegetables far around it. Also Read – Nine hurt in accident at fireworks show in French resortFire trucks and ambulances were at the scene and fire men were dousing the still-smoldering complex with water long after the explosion.“On Thursdays the market is especially crowded because people come from the other provinces to stock up on food for the weekend,” one of the officers said. He said the truck that set off the explosion was a refrigeration truck, so it was impossible to distinguish it from other trucks delivering produce to the market. Also Read – Pakistan Army ‘fully prepared’ to face any challenge: Army spokesmanA minibus driver, Hassan Hamid, said he driving not far from the area when the force of the explosion threw his vehicle about 10 meters (yards) away and onto the sidewalk.“This is the strongest explosion I’ve ever seen in my life,” said the 37-year old father of three, speaking from his hospital bed where he was being treated for shrapnel injuries.“I saw some cars were thrown into the sky and a fire erupted all over the place.” Four hospital officials confirmed the casualty figures.All officials spoke on condition of anonymity because they were not authorised to speak to the media. In a message posted on an IS-affiliated Twitter account, the Islamic State said the attack was carried out by a parked, explosives-laden truck. The claim says the Islamic State seeks to have the “rejectionists (Shiites) experience the same harm as their bombardments cause to our Muslim people.”last_img read more

Israel opens visa application centre in Kolkata

first_imgKolkata: To encourage more Indian travellers to visit Israel, that country has opened a visa application centre in the city for tourists from West Bengal and the north eastern states, sources in the Israel embassy said. Additionally, visa applications in the jurisdiction under the New Delhi centre would also be accepted at the new Kolkata Centre, a release on behalf of the embassy said. The visa application categories include those who go there for employment, for business, tourism, meeting or conference and for students, it said. Also Read – Rain batters Kolkata, cripples normal life Speaking on the occasion, Hassan Madah, director in the Israeli Ministry of Tourism – India and Philippines, said Israel is experiencing a tourism boom like never before. India has recorded a half yearly growth of 82 per cent in tourists visiting Israel from January to June this year as compared to the same period in 2015 and has become one of the best performing markets in Asia for Israel. Keeping this in mind, Israel consistently aims to introduce initiatives that ease the procedure of visa applications to Israel, he said. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed The new centre in Kolkata will no longer require residents from West Bengal and NE states to send in their documents to the Israeli embassy in New Delhi. “We are confident that this will be seen as a positive move to increase interest among travellers from these regions of India,” Madah said. Among other initiatives, Israel recently announced a reduction in visa fees to INR 1,100 from its previous INR 1,700 charged from Indians. In December last year, relaxed visa documentation was brought in for applicants who have availed visas of Schengen countries, US, Canada, Australia or Israel and have completed their travel to these destinations, he said. The Israeli Ministry of Tourism will be conducting a roadshow in Kolkata on August 29 to increase the interest for visiting the country among consumers and trade fraternity. This will help to tap newer segments of travellers, he said. A maiden roadshow was held at Guwahati in May this year and successfully introduced the varied tourism offerings of Israel, Madah said. Israel offers a plethora of things to do and see to cater to the discerning traveller. From the historical city of Jerusalem to the beach city of Tel Aviv. From the Dead Sea, the lowest point on earth, to the marvellous underwater marine life of Red Sea in Eilat, it is a dynamic destination, the release said.last_img read more

Fishermen forum to protest against Centres policies

first_imgKolkata: The National Fishworkers’ Forum (NFF) along with other fish workers’ organisations will organise a movement in the coastal areas of the state on November 21 on the occasion of World Fisheries Day to protest against various policies of the Centre.Debasis Shyamal, general secretary of National Fishworkers’ Forum (NFF) said Center’s various policies favour large-scale investors at the cost of traditional fishing community and mechanised fishing boats have been affecting small scale fishermen. Also Read – Rain batters Kolkata, cripples normal lifeHe also voiced his protest by saying that the Sagarmala Project is going to evict the traditional small scale fishing communities from the coastal areas. The proposed Coastal Regulation Zone Notification 2018 has been published by the Government of India with a view to further open up the coast to massive investment. The Centre has also announced about the West Coast Shipping Corridor that will prohibit fishing along the 85,000 square kilometre of sea waters in the West Coast, Shyamal maintained. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedApart from Bengal, the NFF will also organise protest movement in 10 other coastal states across the country, besides celebrating the World Fisheries Day. November 21 is celebrated all over the world as World Fisheries Day to commemorate the establishment of World Forum for Fisher People (WFFP) in 1997. This year as well fishermen from various organisations will celebrate the day to commemorate glorious movements of the community and take a vow to build up invincible collective resistance against the implementation of various policies by the Centre. The theme of this year’s celebration is “save water, save fish, save fishing people”.last_img read more