zoomIllustration; Source: PxHere under CC0 Creative Commons license Two crew members aboard a bulk carrier, owned by Croatian company Atlantska Plovidba, have lost their lives during tank cleaning operations.Two more seafarers were injured in the incident that occurred aboard the 39,000-dwt vessel AP Dubrava in late afternoon hours of July 17, according to the shipowner.At the time, the Marshall Islands-flagged ship was sailing off the coast of Brazil. It immediately ceased its commercial voyage and headed toward the nearest port, the port of Tubarao in Brazil, that was 150 nautical miles away.A Brazilian navy helicopter was sent to provide assistance to the vessel. The medical team has confirmed the death of the two crew, while the other two seafarers were transported by helicopter to land for observation.Another sailor who was not directly involved in the incident has been transported to hospital, presumably due to stress, Atlantska Plovidba said.Relevant Marshall Islands authorities are scheduled to conduct an investigation.
Nevertheless, these cloud seeding techniques are controversial, both for their effectiveness at inducing rainfall and for their possible harmful side effects. In a recent review paper published in the IOP’s Journal of Physics D: Applied Physics, a team of scientists from Switzerland and Germany has examined the latest results of laser-induced condensation and discussed the future of the field.One of the first successful demonstrations of laser-induced condensation (http://www.nature.com/ncomms/journal/v2/n8/full/ncomms1462.html) came just last year, when researchers – including the authors of the current review – used a powerful laser to produce tiny water particles in moderately humid air. The water particles were just a few micrometers in diameter, which is about 100 times too small to fall as rain droplets. However, the experiments demonstrated the ability to transform particles in a gas phase to a liquid phase through condensation, and larger droplets are expected to be feasible.“At this stage, our work clearly shows that lasers can induce the formation of tiny particles,” Jérôme Kasparian of the University of Geneva in Switzerland told Phys.org. “This is not, at least at this stage, efficient cloud seeding for making rain, but rather a newly opened direction for research in this direction.” (Phys.org) — Although pointing high-energy lasers at the sky to cause pouring rain is currently a high-tech dream, the motivation behind controlling the weather has existed since the days of our ancient ancestors. Throughout human history, many civilizations developed magical or religious methods in an attempt to increase or decrease precipitation. In light of this history, current techniques that shoot laser beams or launch chemicals into the sky for the same purpose seem to be just the latest manifestation of this goal. Lasers could be used to make rain (w/ Video) Laser-induced condensation in a cloud chamber, illuminated by a green auxiliary laser. The cloud’s deformation reveals the air turbulence due to energy deposited by laser filaments. Image credit: J. Kasparian, et al. ©2012 IOP Publishing Ltd As the researchers explain in this review, laser-induced condensation owes its feasibility in part to the rapid improvement in laser power in recent years. Over the past decade, commercially available laser power has increased by two orders of magnitude, reaching the petawatt level today. Scientists expect laser powers on the exawatt scale in the foreseeable future. In last year’s demonstration, the researchers performed experiments using a 100-TW Draco laser and 5-TW mobile laser called Teramobile, which is the size of a 20-foot freight container. In addition to more powerful lasers, improving the results will also require a better understanding of the underlying mechanism of laser-induced condensation. The technique involves photodissociation, in which photons break down atmospheric compounds in the atmosphere. This process produces ozone and nitrogen oxides, which lead to the formation of nitric acid particles that bind water molecules together to create water droplets. Understanding the details of how this process stimulates particle growth, as well as how atmospheric conditions affect the process, are the most challenging questions in this field, according to the scientists.“Making rain would require first to have tiny water particles grow into droplets with a size sufficient to fall as raindrops,” Kasparian said. “This depends on the atmospheric conditions, in particular the relative humidity, that these particles will encounter. For example, if the air mass in which the particles have been produced lifts along a mountain hill, it will cool down and condensation will be favored.“Making rain would also require the production of an adequate number density of particles. If there are too few particles, we would only get a few drops at most. On the other hand, if there are too many particles, they will compete with each other to grab the water molecules available in the atmosphere. Ultimately, none of them will grow sufficiently to make raindrops, which may even reduce precipitation.“Finally, the technique would also need to activate a large volume of the atmosphere, i.e., to sweep the laser sufficiently fast.”Despite these challenges, the scientists also noted that using lasers to induce rain has its advantages, particularly its minimal side effects compared to other techniques. For example, cloud seeding methods that involve injecting silver iodide particles into clouds run the risk of having unintended consequences for the surrounding atmosphere, a problem that lasers avoid. Laser-assisted methods also offer better control than chemical methods, since the lasers can be turned on and off and precisely positioned. This control also makes it easier to determine how effective the technique is, since critics often question whether rain might have occurred even without intervention.In the future, the researchers recommend investigating the ability of lasers to seed clouds on a larger scale. Such a task will require further experimental data as well as theoretical modeling.“Our aim now is to tackle the questions that remain open, especially to determine the optimal laser conditions to maximize the condensation process, and to assess for the possibility to obtain macroscopic quantities of condensed water,” Kasparian said. “This also requires an understanding of the physical mechanisms at the root of laser-induced condensation, with the ultimate goal of being able to model the process quantitatively.“Besides the technical feasibility, as discussed above, further experiments will allow us to assess whether laser rainmaking could be cost-effective. This can easily be expressed in terms of the cost per unit rainwater volume obtained. This will depend very much on the ultimate laser power required to get a significant amount of water, which we need to further investigate.” Copyright 2012 Phys.org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. A high-powered laser pulse 10-cm in diameter generates multiple filaments, which is necessary for laser-induced condensation. Laser filaments can be generated at kilometer-range distances. Image credit: J. Kasparian, et al. ©2012 IOP Publishing Ltd Journal information: Journal of Physics D: Applied Physics Explore further Citation: Scientists analyze potential of using lasers to make rain (2012, July 16) retrieved 18 August 2019 from https://phys.org/news/2012-07-scientists-potential-lasers.html More information: J. Kasparian, et al. “Laser-assisted water condensation in the atmosphere: a step towards modulating precipitation?” J. Phys. D: Appl. Phys. 45 (2012) 293001 (13pp). DOI:10.1088/0022-3727/45/29/293001 http://iopscience.iop.org/0022-3727/45/29/293001 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.
Shyam Sundar Co. Jewellers welcomed Goddess Lakshmi with a sparkle of Gold and Diamond as they unveiled their new festive collection at Lake Club, Kolkata.The special festive collection ‘Dhanteras Dazzle’ is a collection of Gold, Diamond and Kundan Jewellery which is extraordinarily hand-crafted, traditional and contemporary. The collection was unveiled in the glamorous presence of actor Priyanka Sarkar along with the winner of Sharad Sundari 2016, Ahiri Biswas and Sharad Sundari 2016 (Best Figure) Suchismita Bar. Rupak Saha, Director, Shyam Sundar Co. Jewellers was also present at the launch. Also Read – Add new books to your shelfThe high-quality diamond which is available in rings, earrings, bracelet, pendant etc. is reasonably priced starting from Rs. 10,000 onwards. The collection of Gold is starting from Rs 3,000 and the price of the Kundan Jewellery are starting from Rs 50,000. At Shyam Sundar Co Jewellers, designs are crafted keeping a modern woman’s choice and also her convenience. Keeping this view, the Kundan Meena jewellery collection has been designed from light to heavy weight jewellery with coloured precious and semi-precious stones. Also Read – Over 2 hours screen time daily will make your kids impulsiveSpeaking on the occasion Rupak Saha, Director, Shyam Sundar Co. Jewellers said, “The spark and glamorous look of the Gold and Diamond have the power to set a smile on every lady’s face. The ‘Dhanteras Dazzle’ as the name goes would make the occasion precious for all, as the look and glaze of the collection make one feel vibrant and all set for the big festival Diwali. We assure the best and customized jewellery that would go with the taste of today’s women. He also stated, “Jewellery purchases exceeding Rs. 50,000 won’t require Aadhaar Card to be provided after the government reversed an earlier notification, providing a big festive cheer for the sector and potential customers. So it has become very accessible for those who are interested to purchase jewellery for welcoming the festivity as well as the upcoming wedding season”.The “Dhanteras” offer would be on until October 18 with 20% discount on making charges of Gold Jewellery, 100% discount on making charges of Diamond Jewellery, 15% discount on various Gems Stone and assured gift on every purchase. The collection is available at all the showrooms of Shyam Sundar Co. Jewellers.
Kolkata: Trinamool Congress (TMC) celebrity candidate Nusrat Jahan hit back at social media trolls for targeting her, describing these as “uncultured”. Jahan has been named as the TMC candidate from the Basirhat Lok Sabha seat in North 24-Parganas district along with fellow film actor Mimi Chakraborty, who has been fielded by the party from the Jadavpur constituency. However, the announcement of their names on Tuesday was followed by a barrage of distasteful comments on social media, along with memes of their pictures and videos. Also Read – Bose & Gandhi: More similar than apart, says Sugata Bose”I think this is the change that we are trying to bring about. Trolling is a new way of demeaning women. We want women to be given more respect,” said Jahan. “I don’t know who these people are and why they indulge in such online abuse. I think they are simply uncultured. If they knew how to respect their mothers and sisters, they would’ve respected us as well,” she said. Asked about the challenges in her political foray, the 28-year-old said: “During the film promotions, it is our job to reach out to the people. As a political leader, I will have to ensure their welfare as well.”
April 10, 2015 Beware peddlers of lies. Amazon is officially cracking down on phony product reviews. The ecommerce juggernaut not only forbids them on its site, it contends that they’re illegal, too.Case in point: The company filed a lawsuit on Wednesday in Seattle’s King County Superior Court against four websites it alleges publish fraudulent reviews that distort its product ratings.The move, which looks to be a first for Amazon, telegraphs the company’s intensifying intolerance for fake positive reviews louder and clearer than ever before. The suit alleges that fabricated 4- and 5-star product appraisals dilute Amazon’s brand and negatively impact sellers on its site who don’t subvert the system by paying for fraudulent reviews.Related: Yelp: We Won’t Stand for Businesses That Pay for Fake Reviews“While small in number, these reviews threaten to undermine the trust that customers, and the vast majority of sellers and manufacturers, place in Amazon, thereby tarnishing Amazon’s brand,” the suit states. “Amazon strictly prohibits any attempt to manipulate customer reviews and actively polices its website to remove false, misleading, and inauthentic reviews. Despite substantial efforts to stamp out the practice, an unhealthy ecosystem is developing outside of Amazon to supply inauthentic reviews.”The high-profile suit, clearly intended as a warning to fraudsters, was filed against California resident Jay Gentile, who allegedly runs buyazonreviews.com, and unidentified “John Does 1-20,” the alleged proprietors behind “buyamazonreviews.com,” “bayreviews.net” and “buyreviewsnow.com.”Amazon has accused the defendants of a laundry list of alleged crimes, including violations of the Washington Consumer Protection Act and the Anticybersquatting Consumer Protection Act, as well as of false advertising and trademark infringement (i.e. – displaying Amazon’s logo and using domain names that are “confusingly similar” to Amazon’s).Related: Yelp Sues Sites That Claim They Can Sell Business Owners 5-Star ReviewsMark Collins, who The Seattle Times reports owns buyamazonreviews.com (which the suit says is run by Gentile, though Collins claims to have never heard of him), says the service he provides is not illegal. Collins claims buyamazonreviews.com merely assists third-party Amazon sellers in amassing reviews. “We are not selling fake reviews,” he told the Times. “However we do provide Unbiased and Honest review on all the products. And this is not illegal at all.”Amazon, which hasn’t yet issued a public statement addressing the lawsuit, did not immediately responded to a request for comment.Related: Amazon Dash Makes Shopping as Easy as Pushing a ButtonFake glowing reviews, intended to boost consumer confidence and in turn hopefully heighten sales, have long been a problem for Amazon and other popular websites, like Yelp and TripAdvisor. Interestingly, the inaugural Amazon customer review was of the “The Butter Battle Book” by Dr. Seuss. That was all of 20 years ago. Now, as Amazon jockeys to legally “butter-side-up” alleged sellers of inauthentic reviews “to small smithereens,” the 1984 rhyming war battle yarn seems an apropos first recipient of an Amazon customer assessment.If Amazon wins this war in court, it will receive triple damages and attorney fees and, more importantly, the alleged fraudsters will be forced to quit hawking Amazon reviews and to suspend use of the company’s name and logo.Related: How to Get Your Business on Amazon’s New Home Services Platform Enroll Now for Free 3 min read Free Workshop | August 28: Get Better Engagement and Build Trust With Customers Now This hands-on workshop will give you the tools to authentically connect with an increasingly skeptical online audience.