Tag: 新龙凤419

Hima Das: Love for speed helps Assam teenager defy the odds on the tracks

first_imgHima Das, the first Indian woman to win a gold at the IAAF World Under-20 Athletics Championships, has become an overnight sensation in the country. The 18-year-old finished first in the women’s 400m final race on the third day of competitions in Tampere and became the top trend on Twitter on a day the Indian cricket team crushed England, the world’s number one team.Prime Minister Narendra Modi, President Ram Nath Kovind and leading lights from cricket and Bollywood wished Hima. A nation rejoiced. A country which reserves its adulation for cricket stars showered its love on the teenager from Assam.In Tampere, Hima, a pre-tournament favourite, clocked 51.46s to win the gold. This gold medal is unprecedented. She is the first Indian track athlete to win a medal IAAF World Under-20 Athletics Championships. Seema Punia (bronze in discus in 2002) and Navjeet Kaur Dhillon (bronze in discus in 2014) were the only other Indian athletes to win medals in this competition.RISE TO STARDOMHima had qualified for the Commonwealth Games after bagging gold in the 400m race of the Federation Cup. The Athletics Federation of India had set a 52-second cutoff to qualify for the Commonwealth Games. Hima was determined to make the cut. She strived hard, trained hard and made full use of her raw speed: in the finals at the Federation Cup, she clocked 51.97 seconds.Virender Sehwag, Amitabh Bachchan doff their hats to Hima Das: So proud of youAccording to a report in ESPN, when Hima called her mother Jonali Das to give her the good news, the latter had no idea what her daughter was talking about. “Commonwealth Games? What’s that? Will you be on TV? Then it’s probably a good thing..”advertisementAt Gold Coast, Hima finished sixth in the Commonwealth Games 400m final after qualifying with a personal best of 51.53 seconds. She had finished third in her semifinal, shaving off 0.44 off her previous best, but eventually made the cut as seventh fastest among eight finalists.World U20 Championships: Hima Das wins India’s first ever gold in track eventHima had gone to Australia as one of India’s brightest medal prospects. She did not win a medal but did India proud with her spirited performance.EARLY LIFEHima was born to Jomali and Ronjit Das, a rice farmer in Kandhulimari village, about five kilometers from Dhing town in central Assam. Her parents, who had four other children to feed, did not have enough money to spend on her sports training. Hima, however, was not to be deterred. According to those in the know, she played football with the boys in her locality till a coach by the name of Shymasul spotted her and advised her to focus on athletics.RAW SPEEDHima’s coaches were impressed with her dedication but more importantly, they were awestruck by her raw speed. Unlike most other sprinters and runners across the world, the Assam girl had little formal training. At the Junior National Championships, she competed with girls who had trained under specialised coaches to qualify for the finals of the 100m.Hima Das reacts after historic 400m gold: Thank you for the support, IndiaOne of her early coaches said he had given Hima only some basic training and she picked up the rest as she went along. Raw speed was her ally as she challenged stronger girls in her age group. Nothing could hold her back even when many around her had little expectations.SCENES OF DELIGHTIn Finland, soon after clinching gold, Hima wrapped the tri-colour and thanked India for the support and good wishes. Her interview was delightful for its innocence and her sheer, unadulterated joy. Hima was a proud young girl, happy to put Indian athletics on the world map.last_img read more

PM Modi lauds Gambhir for his contribution to Indian cricket and his work on social causes

first_imgNew Delhi, Dec 16 (PTI) Prime Minister Narendra Modi has lauded recently retired cricketer Gautam Gambhir for his contribution to the sport as well for his efforts to bring “positive difference in the lives of the lesser privileged”. PM Modi made a special mention of the contribution made by Gambhir during India’s triumphant campaign at the ICC World Twenty20 2007 and the ICC World Cup (50-over) in 2011. “Let me begin by congratulating you for your stupendous contribution to Indian sports! India will always be grateful to you for you memorable performances, many of which resulted in historic victories for our nation,” Modi wrote in the letter which was posted by Gambhir on his Twitter handle. Gambhir thanked the PM for his kind words. “Thanks @narendramodi @PMOIndia for the kind words. Nothing of this would have been possible without love and support of our fellow countrymen. All these deeds are dedicated to our country,” he said in the same tweet posted along with the letter. Modi praised Gambhir’s passion for the game. “I am sure the journey was filled with both ups and downs but your dedication and persistence ensured that you began to play for the nation. Within a short span, you emerged as a dependable opener, who often took the team to flying starts,” the Prime Minister said. The 37-year-old Gambhir was one of the most outspoken sportsmen who do not shy away from voicing their opinions on several issues facing the nation. “The firmness and frankness with which you have spoken about issues, especially relating to India’s unity and integrity have endeared you to people across the spectrum,” PM Modi said.advertisement “Alongside your game, you have been at the forefront of several community service initiatives and this is extremely heartening to see. It is great when public figures show the way and devote time as well as resources towards bringing a positive difference in the lives of the lesser privileged,” he said. Gambhir made 58 Test appearances for India, accumulating 4154 runs at an average of 41.95. His 147 ODI games fetched 5238 runs, while in 37 T20 Internationals, he scored 932 runs. “When you announced retirement from all forms of cricket, you left several well wishers of yours disappointed. However, this decision marks the start of not one but several other innings of your life. You will have the time and opportunity to pursue other aspects which you would have wanted to pursue a lot earlier but didn’t not have the time for,” Modi said. After his retirement, there was speculation that Gambhir may join politics but he categorically rejected it. PTI PDS PDS BSBSlast_img read more

NBA Fines Anthony Davis 50K Over Public Trade Demand

NEW YORK (AP) — Anthony Davis’ agent let everyone know he wants out of New Orleans, and now it will cost his client $50,000.The NBA fined the Pelicans star because of his agent’s comments that Davis won’t sign an extension and wants to be traded.New Orleans Pelicans’ Anthony Davis, left, gets fouled by Los Angeles Clippers’ Tyrone Wallace during the second half of an NBA basketball game, Monday, Jan. 14, 2019, in Los Angeles. The Pelicans won 121-117. (AP Photo/Ringo H.W. Chiu)The league office said in a written statement released Tuesday evening that Davis violated a collectively-bargained rule prohibiting players or their representatives from making public trade demands.The NBA said the fine is for statements that were made by Davis’ agent, Rich Paul, on Monday in an intentional effort to undermine the contractual relationship between Davis and the Pelicans.Davis is under contract with New Orleans through the end of the 2019-20 season.He was drafted by the Pelicans with the first overall pick in 2012 after winning an NCAA national championship with Kentucky and has been named an All-Star the previous five seasons.However, the Pelicans have made the playoffs in only two of his six full NBA seasons and won only won playoff series, sweeping Portland in the first round last season before falling in five games to champion Golden State in the second round.Davis has averaged 29.3 points and 13.3 rebounds per game this season, but has missed the past four games with a sprained left index finger while the Pelicans have fallen to 22-28 heading into Tuesday night’s game at Houston.Had Davis been committed to remaining in New Orleans, he would be eligible this summer for a five-year, roughly $240 million extension with the Pelicans that would have kicked in beginning with the 2020-21 season.In previous years, Davis had professed his affection for New Orleans. But Davis has also said that his NBA salary is secondary to winning — a clear sign to Pelicans management that they could not take re-signing him for granted if they failed to take concrete and successful steps to surround him with a cast of players who would make New Orleans a contender.When healthy, the Pelicans have looked formidable in short spurts, but injuries have exposed their lack of depth and cohesion as they’ve slipped near the bottom of the Western Conference through the first half of this season.The Pelicans have acknowledged Davis’ preference to be traded and appear inclined to honor it rather than lose him for nothing. But a statement from the franchise made it clear that the Pelicans’ brass are prepared to be patient while awaiting a deal done on their terms and timeline.The implication is that a trade may not come before the Feb. 7 deadline to make a deal this season, and more likely could come after the season, when 2019 draft slots are known and when the Boston Celtics are eligible to enter the fray.Boston, which has a stockpile of draft picks and promising young players as trade bait, is not eligible to trade for Davis under NBA rules until July 1, unless the Celtics also trade away Kyrie Irving. Irving is a factor because of what’s known as the Rose Rule, which says NBA teams cannot trade for more than one player who has signed an extension. Irving currently is playing under an extension signed with Cleveland that has an option year after this season, meaning it could be renegotiated in a way that also allows Boston to bid for Davis. read more

Researchers demonstrate way to shape electron beams in time through interaction with

first_imgPulses of electrons (green, coming from the left) impinge on a micro-structured antenna which is powered by laser-generated terahertz radiation (red). The interaction compresses the duration of the electron pulses to a few femtoseconds. Credit: Christian Hackenberger Attosecond physics: Film in 4-D with ultrashort electron pulses More information: C. Kealhofer et al. All-optical control and metrology of electron pulses, Science (2016). DOI: 10.1126/science.aae0003AbstractShort electron pulses are central to time-resolved atomic-scale diffraction and electron microscopy, streak cameras, and free-electron lasers. We demonstrate phase-space control and characterization of 5-picometer electron pulses using few-cycle terahertz radiation, extending concepts of microwave electron pulse compression and streaking to terahertz frequencies. Optical-field control of electron pulses provides synchronism to laser pulses and offers a temporal resolution that is ultimately limited by the rise-time of the optical fields applied. We used few-cycle waveforms carried at 0.3 terahertz to compress electron pulses by a factor of 12 with a timing stability of <4 femtoseconds (root mean square) and measure them by means of field-induced beam deflection (streaking). Scaling the concept toward multiterahertz control fields holds promise for approaching the electronic time scale in time-resolved electron diffraction and microscopy.Press release Journal information: Science (Phys.org)—A small team of researchers with Ludwig-Maximilians-Universität München and the Max-Planck-Institute of Quantum Optics, both in Germany has successfully demonstrated a means for shaping electron beams in time through interactions with terahertz electromagnetic fields. In their paper published in the journal Science, the team describes their technique and why they believe it may lead the way to ultrafast microscopy and diffraction techniques. In a Perspectives piece in the same journal issue, Claus Ropers with the University of Göttingen, describes the benefits of developing faster electron microscopy, outlines the technique used by the researchers with this new effort and offers some insight into where the science is headed. Explore furthercenter_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. Citation: Researchers demonstrate way to shape electron beams in time through interaction with terahertz electromagnetic fields (2016, April 22) retrieved 18 August 2019 from https://phys.org/news/2016-04-electron-interaction-terahertz-electromagnetic-fields.html © 2016 Phys.org There is no doubt that electron microscopy techniques have led to incredible advances in the understanding of matter at the molecular and atomic scale. But such devices could be made even better, Ropers explains, by making them run faster, or ultrafast, i.e. with pulses measured in femtoseconds. This is because there is motion at the atomic scale—using short bursts of electrons to capture the mechanics of such motion would open up a whole new world of discovery. To that end, researchers have developed devices with that goal in mind.To produce short bursts of electrons in traditional devices, a metal surface is illuminated by a laser, causing electrons to be emitted into a vacuum—unfortunately they do not all travel at the same speed, which means they spread apart as they move towards a target—coulomb forces cause even more stretching, which results in problems in time resolution in microscopy devices. To get around this, researchers have tried multiple approaches that rely are various types of devices that manipulate the electron stream. In this new effort, the researchers used optics and terahertz radiation instead.The idea is to cause faster moving electrons to slow down a little bit and slower moving electrons to speed up a little bit, resulting in all of the electrons in a group traveling at the same speed towards a destination. This is achieved with the new technique by having terahertz fields act on the electrons in a microstructure—its bow-tie shape enhances the field in the desired way via tilting. In testing their device, the researchers found that they could measure pulse durations of just 75 fs, a ten times reduction in value over those that were not modified.last_img read more