Category: sdcmhmij


Uljanik Chooses Brodosplit as Partner to Stay Afloat

first_imgzoomImage Courtesy: Janko Hoener / CC-BY-SA-4.0. Croatia’s struggling shipbuilder Uljanik has elected its compatriot Brodosplit as a strategic partner to restructure its operations.Brodosplit would now have an obligation to devise a feasible restructuring plan, in cooperation with Uljanik, the company said in a stock exchange filing.The shipbuilder, which owns two shipyards in the northern Adriatic cities of Pula and Rijeka, added that the strategic partner would be able to enter the ownership structure through a capital boost.Reuters cited Economy Minister Darko Horvat as saying that the Italian shipbuilder Fincantieri was also working with Brodosplit on the offer. No further details on the matter were provided.Croatian government last year provided HRK 2.5 billion (USD 382.4 million) on state guarantees to help Uljanik stay afloat.The minister earlier said that Uljanik’s restructuring process would cost about EUR 800 million, with at least half of the amount expected to come from a strategic partner, Reuters informed.An association of tax payers, Lipa, voiced its objections to the Croatian government’s intention to support the shipbuilder’s restructuring process with an additional amount of HRK 3 billion of taxpayer money, adding that the project comes with a number of risks.The government has injected over HRK 30 billion over a period of 25 years only to revive and sell its state-owned shipyards, Brodosplit being one of those.Lipa added that losses related to Uljanik would amount to at least HRK 4.2 billion, meaning that each job in Uljanik cost Croatia’s citizens HRK 1 million.World Maritime News Staff; Image Courtesy: Janko Hoener / CC-BY-SA-4.0.last_img read more


Vancouver park board lacked authority to ban whales dolphins at aquarium court

first_imgVANCOUVER – Vancouver’s park board did not have the authority to ban whales, dolphins and porpoises at the city’s aquarium, a British Columbia judge has ruled.The B.C. Supreme Court decision released Friday follows the Vancouver Aquarium’s announcement last month that it will end the practice of displaying cetaceans in captivity.The Ocean Wise Conservation Association, a non-profit society that runs the aquarium, filed an application for judicial review last year challenging a bylaw amendment passed by the park board prohibiting the keeping of cetaceans in parks.The aquarium has a licensing agreement with the park board that allows it to operate in Stanley Park, and it was renewed in 1999 to include “non-interference” provisions.Justice Andrew Mayer said in his ruling the agreement states the board will not interfere with the day-to-day administration of the aquarium, and as a result the bylaw amendment is unenforceable.“In my view, when an administrative body begins to trench into areas of ethics, morality and perhaps even animal rights, it may overstep its bounds if it adopts a political position which conflicts with its core mandates,” he said in his written ruling.The board approved the aquarium’s $100-million expansion plan in 1996 and made several other agreements in subsequent years that didn’t remove the non-interference provisions, Mayer said.The aquarium planned to create larger outdoor pools for beluga whales, sea lions and dolphins, and upgrade its building.The judge said the bylaw “effectively undoes the park board’s approval of the expansion project” because the aquarium would be prohibited from using the expanded facilities for its intended purposes.The Vancouver Board of Parks and Recreation issued a statement saying it was “obviously disappointed with the conclusion the court reached in the matter.”It said the board would be reviewing the reasons and would consider its options.The debate over holding cetaceans at the aquarium has been brewing for decades, but the heat was turned up when two of the aquarium’s belugas died in 2016.Since then, a false killer whale named Chester, and Daisy, a harbour porpoise, also died at the facility.The Vancouver Aquarium said in a statement that it is pleased with the decision.“We will need to take the time necessary to review the judgment with our legal counsel and consider the implications it may have on our organization before determining our future course of action or making any further public statements about these matters,” the statement says.The aquarium announced in January it would end the display of cetaceans because the controversy and distraction surrounding the issue had begun to limit its ability to pursue its ocean conservation mission.The aquarium had previously said it would phase out its cetacean program by 2029, after it brought in five new belugas.The judge stopped short of quashing the bylaw, saying the board was authorized to enact such amendments as long as it didn’t apply to the Marine Science Centre in Stanley Park.Animal Justice, an intervener in the case, said in a news release that the curtain is closing on whale and dolphins being kept in capacity, noting that a bill banning captivity and breeding of cetaceans in Canada is moving through Parliament.“It is clear that whale and dolphin captivity is an archaic, dying practice that will soon be outlawed,” the statement says.last_img read more


As number of Canadian seniors grows so do worries over health care

first_imgVANCOUVER (NEWS 1130) – A significant number of seniors in Canada believe they’ll have to delay their retirement in order to be able to afford the health care services they need, a new study has found.According to the Canadian Medical Association, the current system is failing those 65 years and older, while many are also worried about their ability to get the help they’ll need when they’re sick.The CMA is taking that issue to federal and provincial leaders in Prince Edward Island, as ministers meet to discuss the state of seniors care country-wide on Wednesday.Canada is at a point where the youngest members of the Baby Boomer generation are now hitting the age of 55. It’s been described by some as the grey tsunami, as seniors are expected to exceed the number of children 14 and under for the first time ever in the country by 2021.According to findings from the national Ipsos poll, nine-in-10 Canadians are worried about the growing cost to look after them, and six-in-10 believe they’ll have to push their retirement back to afford health care.The CMA is advocating for federal money to help provinces and territories cope.“Meeting the health care needs of our aging population is a nationwide issue, with seniors across the country having to pay more out of their own pockets for the care they need,” CMA President Dr. Gigi Osler said. “What we’re seeing today reflects the limitations of seniors’ care, and we can – and must – do better.”The same poll found Canadians over 55 are more likely to vote for the party they think has the best plan for the future of health care in the federal election in the fall.Overall, the research found negative emotions far outweigh positive ones — 62 per cent to 38 per cent, with 22 per cent of people saying they are nervous when it comes to the future of health care in Canada.Twenty-one percent of respondents said they were afraid, while 18 per cent said they were distressed when it came to the topic.last_img read more


As Montreal booms citys reputation for affordable apartments takes a hit

MONTREAL — When Erica Fagan and her fiance started looking for a new apartment in their St-Henri neighbourhood, they thought they had reasonable criteria: they wanted a two-bedroom place where they could bring their own appliances and their cat, Odin.But when she started looking, the 31-year-old found there was almost nothing in her price range of $1,200-a-month, much less a two-bedroom that accepted animals. Affordable apartments that were posted online were scooped up almost immediately, leading to her to constantly scour Kijiji, Craigslist and Facebook Marketplace.“I would say within the hour of some places going up they’d get so many replies (the owner) couldn’t answer any more,” Fagan said in a phone interview.“Someone we know is a homeowner in St-Henri, and her neighbour said that within an hour of putting up her duplex for rent, she got about 300 responses.”Fagan’s story has become a common one this year in Montreal, where the lowest vacancy rate in decades has led to a mad scramble to find housing and, according to housing advocates, is threatening the city’s reputation for affordable rent.Fagan and her fiance managed to find a new apartment meeting their criteria, but it meant leaving St-Henri for nearby Cote-des-Neiges, where they’ve settled in to the top unit of a fourplex.“We’re happy, we love the area and it has everything we need, but we’re a little sad we were priced out (of St-Henri),” she said.Francis Cortellino, an economist for the Canadian Mortgage and Housing Corporation, says the city’s vacancy rate last year dropped to 1.9 per cent, the lowest it has been since the early 2000s.Cortellino attributes the tight rental market to the arrival of a large number of non-permanent residents in the city, namely temporary workers, international students and refugees. He said the vacancy rate declined despite a record-high 10,000 rental housing starts last year.The fact that some millenials are delaying home ownership and the imminent retirement of baby boomers who downsize into apartments are other factors that could continue to affect demand and price, he said.But Patricia Viannay, a community organizer with Montreal housing advocacy group POPIR, identifies other reasons. She said the organization has seen a rise in cases of so-called “renovictions,” when landlords use major renovations as a way to get around the province’s rules on evictions and rent increases.“They’re creating the housing shortage by not renting their apartments,” because they would rather wait to be able to hike the price substantially after a period of sitting empty or rent them on Airbnb.Viannay’s group knows firsthand the effects of gentrification. After 50 years on Notre-Dame Street in St-Henri, POPIR is currently moving its offices after their building’s new owner raised the rent beyond what it could afford.As renters like Fagan compete for housing, Rebecca Bain sits alone in her apartment in a sixplex, surrounded by five empty units that were once affordable rentals.The sound of banging and sawing echoes through the walls of her small, bright apartment as construction workers in the adjacent units rip out almost-new counters and strip the walls and floors bare.The 53-year-old musician says the other apartments are vacant not in spite of the housing shortage, but because of it.Bain’s cheerful St-Henri apartment is filled with plants, family photos and nods to her love of medieval music and of cats. When she moved in two years ago, she considered herself lucky to have a found a clean, renovated apartment within her price range.However, last fall her building and three others were bought by a developer, who wants to convert the building into luxury apartments and raise the rent far beyond the $755 she pays each month.While her neighbours acquiesced to the new landlord’s request to move out, Bain is staying put. She says she knows her rights as a tenant and is willing to fight for them, but she’s sad about the loss of the other affordable apartments and the effects on her fellow tenants, some of whom are elderly or have children.“Since when did having an affordable, clean decent home become a luxury?” she said.Montreal’s city councillor responsible for housing, Robert Beaudry, says the city is aware of the pressure being put on housing and has no intention of letting the city become like Toronto or Vancouver, where average rents last year were more than $1,300 compared with Montreal’s $796.In recent months, the city has moved to limit short-term rentals such as those offered on Airbnb, rolled out a plan to help renovate aging buildings and promised to create 12,000 new social and affordable housing units by 2021.This summer, the city also plans to table a bylaw that will require developers to include more social, affordable and family housing in their buildings.“Montreal is a mixed city, on a human scale, where all kinds of people can live,” Beaudry said.Viannay said that while the current administration has expressed more willingness to tackle the problem, it remains to be seen whether they’ll follow through.She says there’s a desperate need for social housing, and it can’t some soon enough in a city where almost 100,000 people are estimated to be renting beyond their means.And that’s a situation that will only get worse due to the current housing crunch, where families are finding themselves crammed into too-small dwellings or forced to uproot altogether.“By forcing people to leave their neighbourhoods, there is all this social fabric that disappears,” she says.Morgan Lowrie, The Canadian Press read more


Former Yugoslav Republic of Macedonia UN expert speaks out on religious intolerance

30 April 2009An independent United Nations human rights expert today spoke out against reports of religious intolerance in the former Yugoslav Republic of Macedonia, and expressed disbelief at the backlash targeted against a recent court decision to restrict religious teaching in public schools. Wrapping up a five-day visit to the country, the Special Rapporteur on freedom of religion or belief, Asma Jahangir, issued a statement noting that the Constitution “provides that religious communities and groups are separate from the State and equal before the law.“I was astonished by the outrage expressed publicly by certain religious leaders and politicians against the recent judgment of the Constitutional Court,” said Ms. Jahangir. “It is vital that the independence of the judiciary is fully respected, particularly when making decisions regarding religious issues.”A number of people Ms. Jahangir met on official business, including government officials, members of civil society and representatives of religious communities, pointed to the perception that the two major religious communities in the country wield considerable political influence and are eroding the division between religion and State.The Special Rapporteur noted that the “judgment does not in any way impinge upon the freedom to receive religious instruction outside of primary school teachings.”She added that the UN Human Rights Committee concludes that the freedom of religion or belief allows public school instruction in subjects such as the general history of religions and ethics if it is given in a neutral and objective way.“Furthermore, the Human Rights Committee acknowledges that it is also permissible for public schools to be involved in religious instruction, noting that it would be consistent with human rights commitments to do so, insofar as ‘provision is made for non-discriminatory exemptions or alternatives that would accommodate the wishes of parents and guardians,’” she added.During her visit, Ms. Jahangir traveled to Skopje, Tetovo and Prile, noting that the former Yugoslav Republic of Macedonia is a multi-ethnic, multi-cultural and multi-religious society, with by and large a high level of tolerance in its society.However, she voiced concern over the number of reports regarding expressions of incitement to racial or religious hatred. “These contribute to creating a climate of intolerance and threaten the security of individuals.” The freedom of expression, even when it is deemed offensive, must be respected, said Ms. Jahangir, but promoting religious hatred and incitement to discrimination, hostility or violence must be prohibited by law. “In an otherwise tolerant society, I was saddened to learn that there have been some cases of mob violence, threats and extreme forms of pressure against members of religious minorities,” said the Special Rapporteur. “Their complaints to local authorities have reportedly not been taken seriously.”She underscored the Government’s obligation to protect its citizens from acts of religious intolerance and discrimination, and the support civil society needs to provide in creating awareness on human rights issues, including freedom of religion or belief.“Despite the above-mentioned concerns, I remain optimistic that a continuing debate on freedom of religion or belief in the former Yugoslav Republic of Macedonia will contribute to a higher level of understanding and respect between different religious communities and individuals, including atheists.”The Special Rapporteur, who serves the UN in an independent and unpaid capacity, will present her findings and key recommendations in a report to the Geneva-based Human Rights Council in 2010. read more


Gota tells troops to remain vigilant

“Though some sections of the arts and entertainment community had doubts about the ability of military personnel to undertake such work, even those who were critical are commending the exemplary work done by those officers today,” he said. “ Not long after the war, His Excellency the President appointed some of the Flag Rank Officers who were at the war front as Ambassadors and Deputy Ambassadors in different countries around the world. Many Officers were also posted as Defence Attach,s to important embassies. In these various capacities, they have all brought a great deal of credit to their respective Forces, and have done a great service to their country. Similarly, there are other fields in which Service personnel have had the opportunity to display their dedication, adaptability and professionalism in serving the country,” he said.He noted that the entire management of the newly built Mahinda Rajapaksa Nelum Pokuna Performing Arts Theatre comprises officers from the three Services. “We know that there are remnants of the LTTE still operating outside Sri Lanka, and there are others even within Sri Lanka who may try to destabilise the peace. It is very important that we remain vigilant about such threats. We must ensure that peace and stability continues, enabling us to build a better future for all Sri Lankans,” Rajapaksa said. Defence Secretary Gotabaya Rajapaksa has urged the security forces to remain vigilant of groups both within and outside the country who may attempt to destabilize the peace.He said that even though the 30 year long war has ended, it is the primary duty of all military personnel to ensure the continued security and stability of the country. He also said that with the end of the war, the responsibilities that will be vested with the Armed Services may go beyond what is customary. read more


Blackstone signs deal to acquire Dream Global Real Estate Investment Trust

Companies in this story: (TSX:DRG.UN, TSX:DRM) TORONTO — Blackstone has signed a deal to acquire Dream Global Real Estate Investment Trust in a deal valued at $6.2 billion, including debt.Dream Global holds a portfolio of office and industrial properties located in Western Europe, focused on Germany and the Netherlands.Under the agreement, Dream Global unitholders will receive $16.79 per unit.Dream Global units closed at $14.17 on the Toronto Stock Exchange on Friday.The deal requires approval by two-thirds of the votes cast at a special meeting of unitholders and a majority of the votes cast by unitholders other than Dream Asset Management and other related parties.The deal is also subject to other customary conditions and is expected to close in December. The Canadian Press read more


Germany hosts difficult G20 talks on trade climate

HAMBURG – Talks on global trade at the Group of 20 summit proved very difficult and differences on climate change also were clear, German Chancellor Angela Merkel said Friday, as police and protesters clashed throughout the day in the summit’s host city of Hamburg.Merkel told leaders of the G-20 economic powers that they must be prepared to make compromises as she worked toward a summit outcome that everyone present could accept.That is a challenging task at a time when President Donald Trump’s Trump’s “America First” rhetoric and decision last month to withdraw from the Paris accord against climate change have caused widespread concern.Negotiators “still have a great deal of work ahead of them” to formulate a passage on trade in the summit’s closing communique, Merkel said after the first day of meetings.She added that most participants called for “free but also fair trade” and underlined the significance of the World Trade Organization, though she didn’t specify which ones did not support the trade language.“The discussions are very difficult, I don’t want to talk around that,” Merkel said.The German leader said most summit participants backed the Paris climate accord. Speaking separately, French President Emmanuel Macron spoke of “the common engagement which we must take, we must defend, at a moment when it is called in question by certain people.”“It will be very interesting to see how we formulate the communique tomorrow and make clear that, of course, there are different opinions in this area because the United States of America regrettably … wants to withdraw from the Paris accord,” Merkel said.Germany has been keen to preserve the G-20’s tradition of making decisions by consensus. Merkel has rejected calls from some to push for a strong “G-19” statement — without the U.S. — on climate change.Opening discussions earlier in the day, Merkel told fellow leaders that there are “millions of people following us with their concerns, their fears and their needs, who hope that we can make a contribution to solving the problems.”“We all know the big global challenges, and we know that time is pressing,” she said. “So solutions can only be found if we are prepared to compromise … without, and I say this clearly, bending ourselves too much out of shape. We can of course also name differences.”The leaders did make a joint statement on fighting terrorism, an issue on which there are few differences. They called for ensuring that there are “no ‘safe spaces’ for terrorist financing anywhere in the world” and pledged to work with internet providers and app administrators to combat the web’s use for terror propaganda and financing.Merkel noted that the countries at the summit represent two-thirds of the world’s population, four-fifths of the globe’s gross domestic product and three-quarters of world trade.The G-20 comprises Argentina, Australia, Brazil, China, Germany, France, Britain, India, Indonesia, Italy, Japan, Canada, South Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the United States and the European Union.Also attending are the Netherlands, Norway, Spain, Guinea, Senegal, Singapore and Vietnam.Merkel said the threat posed by North Korea’s missile tests was brought up at Friday’s meetings by the leaders of South Korea and other countries in the region, and all hoped that “the U.N. Security Council will find an appropriate answer” to Pyongyang’s violation of U.N. resolutions.The summit was also a forum for a flurry of bilateral meetings, including Trump’s first encounter with Russian President Vladimir Putin.Outside the security cordon around the downtown congress centre, anti-globalization activists set dozens of cars ablaze and tried unsuccessfully to block national delegations from entering the summit.The city already had boosted its police with reinforcements from around the country and had 20,000 officers on hand to patrol Hamburg’s streets, skies and waterways. Another 900 were called in to cope with the clashes.Merkel thanked them for their work.“I have every understanding for peaceful demonstrations,” she said. “But violent demonstrations endanger human lives, they endanger people themselves, they put police officers and security forces in danger, put residents in danger, and so that is unacceptable.” From left: US President Donald Trump, China’s President Xi Jinping, German Chancellor Angela Merkel, Argentina’s President Mauricio Macri and Australia’s Prime Minister Malcolm Turnbull turn around for photographers at the start of the first working session of the G20 meeting in Hamburg, northern Germany, on Friday, July 7, 2017. (John MacDougall/Pool Photo via AP) by Geir Moulson, The Associated Press Posted Jul 7, 2017 1:14 am MDT Last Updated Jul 7, 2017 at 3:40 pm MDT AddThis Sharing ButtonsShare to TwitterTwitterShare to FacebookFacebookShare to RedditRedditShare to 電子郵件Email Germany hosts ‘difficult’ G-20 talks on trade, climate read more


Deploring continued use of heavy weapons Ban urges Syrian parties to end

“The Secretary-General reiterates his condemnation of the indiscriminate use of any weapon against civilians, which contravenes international humanitarian and human rights law,” said a statement issued by his spokesperson. “All civilians must be protected in any situation.”A recent attack, on an improvised camp for internally displaced people in southern Syria on 18 June, reportedly killed over 50 people, including a number of women and children. “The Secretary-General again appeals to all Syrian sides to end the violence and focus on a peaceful, political solution to the conflict,” said the statement.The conflict in Syria, which began in March 2011, has killed more than 150,000 civilians, displaced millions and led to widespread violations of human rights. read more


Ohio State womens hockey winning streak comes to an end with loss

Senior forward Taylor Kuehl (6) fights for the puck during a game against Mercyhurst on Nov. 11 at the OSU Ice Rink. OSU lost, 3-0.Credit: Jon McAllister / Asst. photo editorRiding a three-game winning streak, the Ohio State women’s hockey team fell to No. 8 Mercyhurst, 3-0, Tuesday night.The Buckeyes have faced the Lakers three times in program history, going 1-2 over that trio of matchups. Despite failing to even the series record, OSU coach Nate Handrahan said he felt OSU matched up well with its opponent at the OSU Ice Rink.“Mercyhurst is No. 8 in the country and I think we played them pretty evenly scoring aside,” Handrahan said.Even though the team wasn’t pleased with the outcome, Handrahan said the loss gave the Buckeyes insight into where they stand.When the two teams met on Oct. 5, 2013, the game went into overtime to decide the winner. OSU won the game, 4-3, thanks to now-senior forward Taylor Kuehl, who netted the game-winning goal.The first period went by with no score, as freshman goalie Kassidy Sauve posted five saves.Senior defenseman Sara Schmitt said the first period was the highlight of the game for the Buckeyes and was where they played with the most energy.“First period went well but we kind of only played half the game, and you can’t win if you don’t play the whole game,” Schmitt said.In the second frame, the Lakers totaled eight penalty minutes while the Buckeyes added six.  Mercyhurst capitalized on one of the Lakers power-plays to take the lead.Mercyhurst freshman forward Sarah Robello put a shot past Sauve’s stick side with 11:08 left in the second. Even though the Buckeyes outshot the Lakers, 8-6, the period ended with OSU down one.“Our low point was the middle of the second period we took some shifts off mentally and they capitalized on that,” senior forward Danielle Gagne said. “We stopped playing smart.”Skating onto the ice for the third period, the Lakers were playing with high energy. With 15:12 left in the period, the Buckeyes were on a two-minute power-play. Despite the man-up opportunity, OSU failed to put a goal on the board.Power-play effort is something Handrahan said he wasn’t pleased with.“Special teams, we’ve got to solve that issue, because right now it’s a major factor. If we get one on the five-on-three in the second period might be a different ball game,” Handrahan said. “We have to do some things to create opportunity.”After a penalty on both teams for roughing, the game picked up in physicality.A few minutes later, Luczak was taken out of the game. Referees called a five minute major penalty on the Mercyhurst player for game misconduct, for head contact to an OSU playerMercyhurst junior forward Jenna Dingeldein scored an empty net goal 19:30 into the third period, completing the scoring in the 3-0 shutout.The Buckeyes are scheduled to keep home ice this weekend for a series against Minnesota. The first game is scheduled for Friday at 6:07 p.m. The second tilt is scheduled for Saturday at 2:07 p.m at the OSU Ice Rink. read more


Oxford University apologises after email identifies struggling students

Oxford medics are asked to return to the university early if they have fallen just below the pass level in a particular topic during their exams at the end of their first year, known as…–– ADVERTISEMENT –– Rather than identifying students by their candidate numbers, the timetable included the names of those who were on the pass/fail borderline and would therefore be required to sit an additional oral exam. Oxford University has apologised after mistakenly outing struggling students in an email to their peers. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily  Front Page newsletter and new  audio briefings. The university’s Medical Sciences Division accidentally sent an examination timetable labelled “for tutors” to all first-year medic undergraduates, which included details of students with borderline fails. read more


Komatsu Australia launches updated PC40006 mining excavator

first_imgKomatsu Australia has released the latest version of its 370-t-class mining excavator, the PC4000-6 Series 3, delivering higher productivity, reduced maintenance costs, increased reliability and upgraded safety features, the mining OEM said.The new excavator is based on the PC4000-11 released at MINExpo in 2016 – but incorporates a Tier 2 emissions standard engine, rather than the Tier 4 Final engine fitted to the PC4000-11.It achieves its productivity increases through having the highest digging forces – both in backhoe and face shovel configurations – in its class, a large-capacity 23 cu m backhoe bucket (22 cu m in shovel mode) and faster cycle times through variable-speed slew motors, according to the company.Komatsu-designed-and-manufactured hydraulic pumps contribute to lower maintenance costs through long life and easy-to-maintain design, the company added, while a simplified Komatsu control system ensures a high level of reliability.Safety standards for both operators and maintenance crews have been improved through several upgrades, including 45° stairway access stairs and factory-fitted exit ladders.The PC4000-6 Series 3 has an operating weight of 388-405 t (depending on configuration) and is powered by a Komatsu SDA16V160E-2 engine rated at 1,400 kW.According to Michael Hall, Komatsu Australia’s National Product Manager, Mining, the PC4000-6 Series 3 has been specially developed to suit Australian conditions.“Apart from the engine, the PC4000-6 Series 3 is the same as the PC4000-11 released in Las Vegas – including all the safety and technological developments it incorporated. Komatsu can now supply the latest design and technology with a Tier 2 option to Australian mines not requiring the Tier 4 PC4000-11 model,” he said.“For that reason, we are offering this model with the well-known and proven Tier 2 compliant Komatsu SDA16V160E-2 engine for Australia. And it comes direct from the factory aligned with Australian mining requirements, so minimal modifications are required.”Hall said Komatsu Australia brought the first PC4000-6 Series 3 to the country in the June quarter of 2018 in backhoe configuration.“This size and configuration of excavator is a flexible loading tool option for many Australian mining operations and, with the local industry showing improved growth and activity, bringing in a stock machine is a sign of our confidence in the industry’s future,” he said.“We see excellent potential for this model and are keen to see the advantages and improvements it delivers used in mining operations in Australia.”Upgraded safety features are key improvements on the PC4000-6 Series 3.The 45° access stairs allow operators and maintenance personnel much easier and safer access to the machine, including easier access to the machinery house level and to the operator’s cabin.“Another safety advance is a new emergency egress system, incorporating emergency exits on two sides of the machine, ensuring high safety standards for all personnel on the machine,” Hall said.A flipdown two-piece ladder, with anti-slip surfaces helps ensure quiet and safe exit from the machine in case of emergency, while the front window of the cabin is 19 mm thick impact-resistant glass, giving additional operator protection.A new lighting system, consisting of 14 high-performance working lights using the latest LED technology, ensures significantly better visibility at night and other times of low visibility.The excavator’s control system has been simplified and upgraded, using Komatsu controllers to reduce nodes and provide additional redundancy for improved efficiency.“The PC4000-6 Series 3 is fitted with Komatsu’s latest KOMTRAX Plus remote monitoring system, providing remote monitoring information about the machine’s performance and operating status,” Hall said.“It also incorporates extended oil change intervals combined with easier and safer machine access, significantly reducing regular maintenance requirements.“As well, the machine is Modular Mining’s ProVision ready, allowing it to incorporate a machine guidance system that integrates with mine planning software.“It is also ready for MineWare’s Argus Payload System, allowing accurate, reliable payload measurements, so operators can optimise loading to required truck payloads,” he said.In backhoe configuration, the machine has:Operating weight of 394- 405 t;Bucket capacity of 23 cu m;Komatsu SDA16V160E-2 rated engine at 1,400 kW;Arm breakout of 107,068 kg-f;Bucket breakout of 117,775 kg-f;Maximum dig depth of 8,000 mm.In face shovel configuration, the machine has:Operating weight of 388-400 t;Bucket capacity of 22 cu m;Komatsu SDA16V160E-2 rated engine at 1,400 kW;Arm crowd force of 127,462 kg-f;Bucket breakout force of 135,620 kg-f;Maximum dump height of 12,000 mm.last_img read more


Mens OG 2012 Denmark 3 of 3 – Serbs were close Lindberg

Denmark beats Serbia 26:25 (13:9) for their third consecutive win at Olympic Tournament in London. Hans Lindberg was scorer of winning goal 10 seconds before the end. Serbia was five goals in minus in 55th minute (20:25), but managed to get back in the match with Momir Ilic’s goal 45 seconds before the end (24:25). After time-out, Lindberg scored decisive goal, which put Denmark on the Top of Group B.Before Denmark, Croatia won over Hungary 26:19, while Spain took two points against Korea 33:29.STANDING GROUP B:CROATIA 6DENMARK 6SPAIN 4HUNGARY 2SERBIA 0KOREA 0 croatiaDenmarkHandball LondonKorean handballOlympic handballserbiaSpain ← Previous Story Men’s OG 2012 (Round 3): Croatia too strong for Hungary! Next Story → Men’s OG 2012 (Round 3): Historical victory for Argentina – France and Iceland in TOP8! read more


Julia Gillard survives leadership spill in Australia

first_imgJULIA GILLARD HAS secured her position as leader of Labor – and Prime Minister of Australia – after a tense day of wrangling within the party.The Australian PM emerged from a third leadership spill in three years today after she stood unopposed in a strange caucus election.In a brief statement, Gillard claimed the leadership issue within Labor has been settled “in the most conclusive fashion possible”, declaring the “whole business is completely at an end”.“The Government has a plan for the nation’s future. We’ve got plenty of work to be getting on with it, and we’ll be getting on with it in a few minutes’ time.”During the conference she said she accepts the continuing support of the Labor party with “humility” and “resolve”.“I never sought office for its own sake; I have only ever sought office in the interests of the nation, and to assist our nation to prepare to meet the challenges of the future.”For the past three years, deep divisions within the party have been obvious. However, just minutes before the election today, former PM Kevin Rudd announced he would not stand against Gillard in what then became a farcical leadership spill (given that there was no one to oppose the current leader). According to ABC in Australia, there were reports of the former leader canvassing numbers until the last minute but when convinced he could not win with a convincing majority, he reneged.The vote had been called by party elder Simon Crean as he wanted to end the disunity which he said was destroying Labor.“I don’t want any more games, I’m sick to death of it, it’s about time [Rudd] stood up and instead of having his camp leak things, actually have the courage of his conviction and his belief.”Deputy PM Wayne Swan said there was “strong support” for Gillard in the party room today. He described her as a “tough leader” and a “champion for our country”.His said it was now time to get “back to work”.The fallout from today’s vote will see Crean lose his jobs as Arts Minister and Minister for Regional Australia and will take a seat on the backbench for the first time in 23 years. He said he does not regret being the “circuit breaker” and believes Gillard’s mandate is now stronger – something he achieved for her inadvertently.However, Opposition Leader Tony Abbott has used the opportunity to call for an immediate election, claiming the leadership issue is not resolved.It was a busy day for Gillard who earlier addressed more than 800 victims of forced adoptions to issue a full and unreserved State apology.Today: Australia apologises for ‘unethical, dishonest and illegal’ forced adoptionslast_img read more


House of Riz rice pudding awarded best dairy dessert in Australia

first_imgJim Konstas was all smiles last week, when his business House of Riz won the title of best dairy dessert in Australia for its Greek rice pudding.Awarded at the 2017 Australian Grand Dairy Awards, the pudding is manufactured locally on site at a factory in Wantirna South and sold at various IGA stores and select supermarkets around Victoria.“We had a fish and chip shop and we were selling (the pudding) there and it was walking out the door, so that’s where I got the idea of producing it on a large scale for supermarkets,” Mr Konstas told The Leader.He also revealed the award was a particularly sweet victory, given that he had made the bold decision to sell the family home three years ago to ensure the business would survive.“(Starting the business) took a lot out of us, it was hard, it’s a family business, my wife and kids are involved − it is a success now but in the first few years it was hard. “We had to sell the family home to fund the business so that was the hardest thing we’ve ever done, making that call … but it paid off in the end,” he said.The delicious rice pudding is made from a family recipe, using real milk to achieve its smooth texture. To meet demand for his product, House of Riz will soon be relocating from Wantirna South to a new premises in Heidelberg from which it will commence supplying IGA stores throughout the country. Facebook Twitter: @NeosKosmos Instagramlast_img read more


SIDA Objectif Zéro après 30 années de recherche

first_imgSIDA : “Objectif Zéro” après 30 années de rechercheTrente ans déjà que des chercheurs français ont découvert le virus du SIDA. Trente ans que les scientifiques s’acharnent à trouver une solution à cette maladie qui a fait plus de 20 millions de victimes. Pour les 30 ans de sa découverte, des médecins et chercheurs se réunissent pendant trois jours à Paris pour donner un aperçu du futur du SIDA. Triste anniversaire. Le monde célèbre les trente ans de la découverte du SIDA. L’occasion pour des médecins et chercheurs du monde entier de se réunir pendant trois jours à Paris pour discuter de l’avancée des recherches. Baptisée “Imagine the Future”, cette conférence permettra également de présenter des résultats optimistes pour les malades. Obtenir une quasi-guérison ou même une rémission permanente est aujourd’hui à l’ordre du jour pour les scientifiques. “L’objectif zéro” est en marche.Retour sur cinq dates et cinq chiffres qui ont marqué l’Histoire du SIDA…Cinq dates fondamentales – Fin des années 70 : la propagation du virus fait de cette maladie une pandémie et un problème d’ordre sanitaire au niveau mondial. Le préservatif reste le moyen de protection le plus efficace car il n’existe aucun vaccin de prévention.  L’existence d’un problème sanitaire est avéré dès 1981.- 20 mai 1983 : l’équipe du professeur Luc Montagnier publie le résultat de la découverte d’un nouveau virus dans la revue américaine Science. Ce virus-là est différent de ceux habituellement responsables du syndrome d’immunodéficience acquise (Sida). Tout d’abord, ce virus est baptisé Lav pour virus associé à la lymphadénopathie. Cela fait allusion au gonflement des ganglions, signe avant-coureur de la maladie.- 1986 : la Commission de nomenclature virologique décide de nommer le virus du SIDA. Il prend alors le nom de Human Immunodeficiency Virus (HIV).- 1996 : arrivée des traitements combinés, surnommés les trithérapies. Ils permettent aux personnes séropositives de pouvoir profiter d’une durée de vie pratiquement équivalente à celle d’une personne non infectée. De plus, les trithérapies réduisent considérablement le risque de transmission, notamment intra-utérine, entre une mère et son enfant.-  2013 : les espoirs grandissent. L’existence de “contrôleurs naturels” fait avancer les recherches. Les “contrôleurs naturels” ou les “contrôleurs adultes”, sont des personnes capables de contenir le virus sans avoir pris de traitement. C’est apparemment le cas de ce bébé, né aux États-Unis et traité moins de trente heures après sa naissance, avec des antirétroviraux.Cinq chiffres clés :À lire aussiMaladie de Charcot : symptômes, causes, traitement, où en est on ?- 30 millions de personnes sont mortes du SIDA. Et les pays les plus pauvres n’ont toujours pas le même accès aux traitements que les pays les plus riches. – 34 millions de personnes environ sont porteuses du VIH dans le monde. 1,8 million d’entre elles environ décèdent chaque année. 3 millions de nouvelles personnes sont infectées chaque année. – 8 millions de personnes dans le monde ont actuellement accès aux traitements, aux trithérapies. – 21% des nouvelles personnes infectées en moins entre 1997 et 2010, selon le programme commun des Nations Unis sur le VIH.  – 22 à 24 milliards de dollars d’investissement par an et par pays membre de l’ONU dans la lutte contre le VIH d’ici 2014.Le but, à moyen terme, des chercheurs, de l’ONU, des investisseurs est d’endiguer l’épidémie, si possible d’ici 2015. Pour cela, selon l’organisation AIDES, il est nécessaire de mener des actions ciblées sur les populations les plus vulnérables. Mais aussi, “de prévenir des nouvelles infections VIH de la mère à l’enfant, d’initier des programmes sur les changements de comportement, de faire la promotion et la distribution de préservatifs, de mondialiser le traitement, les soins et l’aide aux personnes vivant avec le VIH, et enfin d’encourager la circoncision masculine volontaire dans les pays où la prévalence du VIH est élevée et les taux de circoncision sont faibles”.Le 20 mai 2013 à 18:28 • Emmanuel Perrinlast_img read more

GCCI to hold 2 trade fairs in 2015

first_imgBy MUHAMMED SAILU BAH The Gambia Chamber of Commerce and Industry (GCCI) is planning to host two trade fairs this year as announced yesterday, 25 August, 2015 at a briefing held by its officials at their head office in Bijilo.According to the officials, the first will be the Tobaski Trade Fair taking place at the Gambia Mall in Bakoteh from the 15 – 22 September and to be followed by the 9th Edition of the GCCI International Trade Fair which will be held at the Independence Stadium from 19 December 2015 –10 January 2016. The theme for this international trade fair is ‘Supporting Sustainable Enterprises: the Gambia @ 50’.In her opening remarks, Madam Beatrice Mboge, the chairperson of the session who is also the GCCI Director of Corporate Services, said the objective of the Tobaski Fair, to be organised in collaboration with the Gambia Mall, is to create an opportunity for the GCCI members to be able to promote their businesses and build more connections with partners.“We are expecting to see everything in this Fair, as well as necessary things that people will need for the Tobaski feast,” she said.The GCCI Director of Corporate Services said they will be having the two fairs this year because of popular demand as they initially wanted to have the international event by next year but their members requested for it to be held earlier.“When we told people that the trade fair will be held next year, they said it is too far so therefore we considered their demands and brought it nearer,” said Madam Mboge.She added that through consultation with their members, it was agreed that moving it from March to December makes is better for businesses as this period is a festive and holiday season as well as the peak of the tourists’ season.Madam Mboge noted that GCCI will be working closely with the media to promote the two trade fairs.Mr. Lansana Ceesay, Administrative Manager Mall of the Gambia, said they have 108 shops which are standardly built and that their aim is to promote business in the Gambia. He said it is in this vein that they have decided to collaborate with the GCCI to hold this Tobaski Fair.Baboucarr Saho, Senior Business Development Officer at GCCI, disclosed that 50 stalls will be allocated to their members who are interested in buying a stall for the Tobaski sales.Mr. Saho urged their members to contact the GCCI to be able to get stalls on time.“One of our core responsibilities at GCCI is to showcase Gambian businesses, products and services and encourage business entrepreneurship, among many other businesses,” he said.Mr. Saho also called on the general public to come forward and patronise both the GCCI and Mall Gambia during this trade fair which will be  launched one week before the Tobaski feast.Mr. Alieu Secka, Chief Executive officer GCCI, said they are very delighted to have feedbacks from their members after the last trade fair.“The board and management of the GCCI are working on the new trade fair site at Brusubi in which there is some progress with the building of the Business and Information Centre. So we hope and pray that by December 2016, we will enact our international trade fair there,” revealed Mr. Secka.The GCCI CEO further thanked their business partners. He said the trade fair is not only to make sales but specifically to promote and enhance businesses as well as expose them to the business community so that the public will get to know what products and services are available from a particular business.For his part, Mr. Bai Ibrahima Jobe,  Coordinator of the Enhance Integrated Framework (EIF) program under the Ministry of Trade, emphasised the importance of partnership in promoting businesses.He also assured the commitment of his office towards collaborating with the GCCI in promoting businesses in the Gambia.In his launching statement, Mr. Fady Hocheimy, Chairman of the GCCI Trade Fair Committee, said his history with the Trade Fair started in 2003 as a participant from the LG Electronics settings.He said he has been participating in the trade fair for 12 years now.Mr Hocheimy said the trade fair helps the business sector to develop and that the society, in addition, has a lot of socio economic benefits in it.He emphasised the importance of becoming a member of the GCCI, adding that the membership fee is now reduced.The trade fair committee chairperspn also urged businesses to register early.He noted the registration fees for the stalls are D10, 000 for members and D12, 000 for non-members.Mr. Hocheimy concluded that the trade fair will go for three weeks but that based on the high popular demand they may extent it.]]>last_img read more

Former Candidate to transform special needs education in Turks and Caicos

first_img Related Items:#JasminWalkin, #magneticmedianews, #specialneedseducationinTCI Facebook Twitter Google+LinkedInPinterestWhatsApp Facebook Twitter Google+LinkedInPinterestWhatsAppTurks and Caicos, July 26, 2017 – Providenciales – Jasmin Walkin is now reporting for duty as an Education Officer with a pioneering portfolio in the Ministry of Education; the former General Election candidate, educator and North Caicos native gets to spearhead the crafting a Special Needs policy and needless to say, he is thrilled at the opportunity.    The announcement of Walkin’s appointment came Tuesday in a Ministry of Education media release.Mr. Walkin said, “…this role makes me responsible for the supervision and implementation of the TCI Special Education Policy; an area that is a passion of mine because of my physical limitations and experiences as a student needing special accommodations and my ability to overcome my challenges to presently serve as a senior education official in my country.   I am looking forward to serving in this role as I would have an opportunity to bring more awareness to the development of Special Education in the TCI, carry out needs assessments, make necessary recommendations to the Ministry for further enhancement, oversee the successful implementation of the Special Education Policy and finally contribute to an environment where other special needs students would be able to have a success story similar or ever better than mine.”Deputy Governor, Anya Williams welcomed Jas back to the public sector with,  “…his personal experiences and passion for education and for the area of special needs makes him by far the best person for this role and we are fully confident that not only will he do his best, but that he will work tirelessly to transform the way that we seek to meet special needs within our education sector in the Turks and Caicos Islands.” #MagneticMediaNews#JasminWalkin#specialneedseducationinTCIlast_img read more

Kirsten Gillibrand drops out of US presidential race

first_imgNew York: New York Senator Kirsten Gillibrand, who made feminism and women’s equality the main focus of her presidential campaign, has dropped out of the race for the 2020 Democratic presidential nomination, leaving 20 candidates still in the running. In a video posted on her official Twitter account on Wednesday, Gillibrand announced the end of her campaign, which never aroused much interest among Democratic voters; the latest example of the lack of excitement generated by her candidacy was the fact that she failed to qualify for the party’s next televised debate, Efe news reported. Also Read – Pakistan test-fires 290-km range missile Advertise With Us “After more than eight incredible months, I am ending my presidential campaign,” she said. “I know this isn’t the result we wanted. We wanted to win this race,” she said. “But it’s important to know when it’s not your time, and to know how you can best serve your community and country.” Gillibrand thanked her supporters and asked them to “now, let’s go beat Donald Trump and win back the Senate”. Also Read – Imran calls on Pakistanis to take part in ‘Kashmir Hour’ Advertise With Us President Donald Trump, who has sneered at the latest casualties in the race to seize power from him in 2020, was quick to react to Gillibrand’s post on Twitter, saying that it was “a sad day for the Democrats”. “I’m glad they never found out that she (Gillibrand) was the one I was really afraid of,” Trump said. With Gillibrand’s exit, there are 20 Democrats left in the field. Advertise With Us The New York senator is the first of six female Democratic presidential candidates to drop out of the race, leaving three other women senators – Elizabeth Warren (Massachusetts), Kamala Harris (California) and Amy Klobuchar (Minnesota) – in the running, as well as Congresswoman Tulsi Gabbard (Hawaii) and activist Marianne Williamson. Gillibrand was appointed to her seat in the US Senate in 2009, when Hillary Clinton accepted the role of Secretary of State under former President Barack Obama, the BBC reported. Since then, she has won her re-election bids easily and remains popular in New York. She had one of the largest financial pools to draw from of all the 2020 candidates, with around $10 milion in her campaign coffers following her re-election last year. Gillibrand has been an outspoken supporter for the #MeToo movement as well as advocating for victims of sexual assault on college campuses and in the military. The party next debate will take place on September 12 in Houston, Texas. Only 10 candidates have met both the criteria of obtaining a minimum number of unique campaign donors and a minimal percentage of support in the polls that are required to be on stage in Houston, including three of the five women contestants (Warren, Harris and Klobuchar). Rounding out the list are former Vice President Joe Biden, Vermont Senator Bernie Sanders, New Jersey Senator Cory Booker, South Bend, Indiana, Mayor Pete Buttigieg, former Secretary of Housing Julian Castro, former Texas Representative Beto O’Rourke and businessman Andrew Yang.last_img read more

Quantumcritical conductivity of the Dirac fluid in graphene

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. Quantum-critical scattering rate of the Dirac fluid. (A) Real and (B) imaginary parts of the change in optical conductivity at charge neutrality upon optically heating the electron system to a temperature Te above the equilibrium temperature T0 = 77 K. Each curve corresponds to a different delay between the optical pump pulse (fluence 21 nJ cm–2) and terahertz probe pulse. Solid curves are fits to a difference between Drude functions at Te and T0, using Te and the scattering rate τ–1(Te) as free fit parameters for each pair of curves of the complex conductivity. (C) Blue markers indicate the scattering rates and electron temperatures extracted from the fits shown in (A) and (B); error bars indicate standard error in the fits. The experimental scattering rate follows τ–1 = τee–1 + τd –1 (dashed curve), where τee–1 = 0.20kBTe/ħ (green line) is the scattering rate due to charge-carrier interactions, and τd –1 ∝ nimpTe –1 (dotted curve) is the scattering rate due to unscreened, singly charged impurities with density nimp = 2.1 × 109 cm–2. (D) Real and imaginary parts (open and filled circles, respectively) of σ at different Te (i.e., different optical pump delay), replotted as a function of ħω/kBTe. The data for Te = 100 K (21.3 ps delay) do not collapse and are omitted. Credit: Science, doi: 10.1126/science.aat8687 In all measurements, the scientists heavily doped the graphene beneath the waveguide traces to minimize its impedance. The extracted scattering rates at 77 K were below 0.5 and 1 THz, indicating infrequent scattering by disorder and phonons, consistent with previous transport studies of similar doping; thus confirming the anticipated Fermi liquid behavior of graphene. The scientists probed the transport at charge neutrality by observing the change in terahertz transmission. For this, they optically heated the system and calculated the corresponding change in conductivity and the current carried in charge-neutral graphene under experimental conditions. The observed linear evolution in the experiments was a key signature of charge-carrier interactions in the quantum-critical Dirac fluid. More information: Patrick Gallagher et al. Quantum-critical conductivity of the Dirac fluid in graphene, Science (2019). DOI: 10.1126/science.aat8687 K. S. Novoselov et al. Two-dimensional gas of massless Dirac fermions in graphene, Nature (2005). DOI: 10.1038/nature04233 Experimental setup. Left: Large-area photograph of the waveguide device. Right: Cross-sectional view of the heterostructure beneath the waveguide electrodes. Credit: Science, doi: 10.1126/science.aat8687 Experimentally, time-domain terahertz spectroscopy is an ideal probe across a broad frequency range to observe quantum-critical conductivity, but use of the device is limited to lower-quality large-area films, within which Dirac fluid physics is obscured. In the present work, therefore, Gallagher et al. leveraged the subwavelength confinement of a coplanar waveguide to measure the terahertz optical conductivity of graphene, at ten-micron scale thickness ,encapsulated within hexagonal boron nitride (HBN). They used the experimental setup to measure the material’s conductivity at electron temperatures (Te) ranging between 77 and 300 K to confirm the quantum-critical scattering rate near charge neutrality. The scientists also demonstrated the co-existence of zero- and finite-momentum modes at non-zero doping. Frequency-dependent optical conductivity of graphene in the Fermi liquid regime. (A) Real and (B) imaginary parts of extracted optical conductivity for several Fermi energies between 46 and 119 meV (electron doping) at 77 K. Solid curves are Drude fits using only the scattering rate τ–1 as a free fitting parameter for each curve. Inset in (A) shows an example of the time-domain current data used to extract conductivity in the frequency domain; the purple trace shows the transmitted waveform at 119 meV, and the black trace shows the transmitted waveform at charge neutrality, which is used as a reference. Inset in (B) shows the extracted τ–1 at lattice temperatures 77 K and 300 K. Credit: Science, doi: 10.1126/science.aat8687 In this way, Gallagher et al. elegantly demonstrated the quantitative agreement between the experimental results and relativistic hydrodynamic theory of the Dirac fluid graphene. The scientists implied that graphene should host relativistic phenomena that are not observed in typical electron systems (to which relativistic hydrodynamics do not apply). For instance, in conventional metals, electronic sound waves either morph into plasmons or are destroyed by momentum relaxation. However, the new results indicate that such waves can exist in charge-neutral graphene as a result of low disorder and zero-coupling to plasmon modes. The experimental work by Gallagher et al. thus provided access to the subtle and rich physics of relativistic hydrodynamics of graphene in a bench top experiment. Further experiments can investigate the cyclotron resonance of graphene at high temperatures in the future. The work revealed the quantum criticality of the material in which each site is in a quantum superposition of order and disorder (similar to Schrödinger’s hypothetical cat in a quantum superposition of ‘dead’ and ‘alive’) and the unusual dynamic excitation in graphene near charge neutrality. Physicists consider quantum relativistic effects in the experimental systems influencing condensed matter to be too minute for accurate description by the non-relativistic Schrödinger’s equation. As a result, previous studies have reported on experimental condensed matter systems such as graphene (a single atomic layer of carbon) in which electron transport was governed by Dirac’s (relativistic) equation. Landau’s theory of the Fermi liquid defines electron interactions of a typical metal as an ideal gas of non-interacting quasiparticles. In monolayer graphene, this description does not apply due to its structure of linearly dispersing bands and minimally screened Coulomb interactions. Near charge neutrality, graphene is thus expected to host a “Dirac fluid,” which is a quantum-critical plasma of electrons and holes that are governed by relativistic hydrodynamics. In lightly doped graphene, a surprising consequence of relativistic hydrodynamics is that current can be carried by two distinct modes; with zero and non-zero total momenta, also referred to as “energy waves” and “plasmons” in some studies. Coexistence of zero- and finite-momentum modes at low doping. (A) Calculated Drude weights DZ and DF of the zero- and finite-momentum modes (27) in lightly electron-doped (εF = 33 meV) and undoped graphene. (B) Real and (C) imaginary parts of the measured change in optical conductivity when charge neutral graphene in equilibrium (T0 = 77 K) is simultaneously heated to an electron temperature Te (optical pump delay 3 ps, fluence 21 nJ cm–2) and doped to εF = 33 meV. (D) Real and (E) imaginary parts of the measured change in optical conductivity when charge neutral graphene at an electron temperature Te (optical pump delay 4 ps, fluence 20 nJ cm–2) is doped to various εF. Data at each doping are well fit by a single Drude function (solid curves) describing the conductivity of the finite-momentum mode with free fit parameters Te = 267 ± 3 K and τd –1(εF) ~ 1 THz. Inset in (D) shows the scattering rate for the finite momentum mode τd –1 versus Te extracted from fits at varying Te. Colors indicate εF as in (D), (E). Credit: Science, doi: 10.1126/science.aat8687 Graphene is expected to behave like a quantum-critical, relativistic plasma known as “Dirac fluid” near charge neutrality in which massless electrons and holes rapidly collide. In a recent study now published in Science, Patrick Gallagher and co-workers at the departments of physics and materials science in the U.S., Taiwan, China and Japan used on-chip terahertz spectroscopy and measured the frequency-dependent optical conductivity of graphene between 77 K and 300 K electron temperatures for the first time. Additionally, the scientists observed the quantum-critical scattering rate characteristic of the Dirac fluid. At higher doping, Gallagher et al. uncovered two distinct current-carrying modes with zero and nonzero total momenta as a manifestation of relativistic hydrodynamics.center_img © 2019 Science X Network Citation: Quantum-critical conductivity of the Dirac fluid in graphene (2019, March 13) retrieved 18 August 2019 from Explore further In the experimental setup, Gallagher et al. used photoconductive switches made of semiconducting materials with approximately one picosecond (ps) carrier lifetime to accomplish emission and detection of terahertz pulses. The emitter switch contacting the lower waveguide trace was biased with a dc voltage. When triggered by a laser pulse, the biased emitter became highly conductive for 1 ps. The process injected a current pulse into the coplanar waveguide to interact with graphene prior to reaching a detector switch spanning both traces. In practice, the scientists obtained lower noise by controlling the length of the optical path and detecting the current, to measure the time-domain profile of the transmitted voltage pulse (dV/dt). After optimizing experimental conditions, the scientists first investigated the optical conductivity of the Fermi liquid at 77 K (T0). The transmitted waveforms contained sharp, sub-picosecond features that evolved with gate voltage to result in maximum transmission at charge neutrality. To extract the optical conductivity from the time-domain data and justify the finite-element simulations, the scientists modeled the device as an infinite, lossless transmission line. Gallagher et al. then probed transport at charge neutrality by observing the change in terahertz transmission (∆V) by optically heating the electron system from T0 = 77 K to varying electron temperatures (Te). To vary temperature in the experimental setup, they adjusted the delay between the optical pump and terahertz probe pulse. Journal information: Science Hall effect becomes viscous in graphene Probing the electrodynamics of graphene using on-chip terahertz spectroscopy. (A) Current carrying modes of a graphene sheet. The zero-momentum mode corresponds to a plasma of counterpropagating electrons and holes and can be relaxed by electron-hole interactions. The finite-momentum mode corresponds to a fluid of co-propagating electrons or holes with nonzero net charge and cannot be relaxed by charge-carrier interactions. The vector J denotes the net current flow. (B) Cartoon of the sample. Photoconductive switches (“emitter” and “detector”) triggered by a pulsed laser emit and detect terahertz pulses within the waveguide. The transmitted pulse is reconstructed by measuring the current collected by the preamplifier (“A”) as a function of delay between laser pulse trains illuminating the emitter and detector. The graphene is optionally excited by a separate pulsed beam (“pump”) to heat the electron system. (C) Photograph of the heterostructure embedded in the waveguide. Few-layer graphene (FLG) electrodes make contact to the monolayer graphene sheet under study and the WS2 gate electrode. Scale bar: 15 micron. Credit: Science, doi:10.1126/science.aat8687 , Nature As doping increased, the weight of the zero-momentum mode was expected to decrease, while that of the finite-momentum mode increased to cross over smoothly from Dirac fluid to Fermi liquid behavior. Previous experiments on clean, monolayer graphene have demonstrated many-body physics in graphene, with examples including studies on low-frequency transport phenomena consistent with hydrodynamic descriptions. Additional experiments indicated violation of the Wiedemann-Franz law – as a signature of the Dirac fluid and as direct evidence of collective motion in a quantum electronic fluid, and the viscous flow of electrons. Even though electron-hole collisions have shown to limit conductivity in charge-neutral bilayer graphene, the direct observation of quantum-critical conductivity of the Dirac fluid has remained elusive. last_img read more