Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere


first_imgAirglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by high-frequency atmospheric gravity waves. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2000 and 2001. These were combined with wind velocity variances from coincident radar measurements to estimate the daily averaged upper limit of the vertical flux of horizontal momentum due to gravity waves. The resulting momentum flux at the Na airglow altitudes, while displaying a large day-to-day variability, showed a marked rotation from the northwest to the southeast throughout the winter season. Calculations show that this rotation is consistent with seasonal changes in the wind field filtering of gravity waves below the Na airglow region. The calculations also indicate that while the magnitude of the meridional wind is small, this filtering leads to the observed seasonal changes in the meridional momentum flux.last_img read more

Bill Hazelett: Vermont industrial pioneer, 1919-2010


first_imgThe world’s metals industries lost a pioneer in the field of continuous casting and Vermont lost a remarkable engineer and employer with the passing of R William (Bill) Hazelett at age 91, on June 27, 2010. Son of CW Hazelett, the inventor of the twin-belt casting machine, Bill founded the Hazelett Strip-Casting Corporation and commercialized the design. The Hazelett twin-belt caster is employed extensively in nonferrous strip casting and is the heart of the Contirod continuous copper rod casting process used in the production of over 30 percent of the world’s copper wire. Born in 1919, Bill received his degree in Mechanical Engineering from Cornell in 1942 and immediately joined the war effort, ending up at the Bell Aircraft facility in Burlington. Following the war he remained in Vermont making his lifelong home in Colchester while commuting to Connecticut to work with his father. During this period he started the Tick Tock Shop in Burlington which he subsequently sold to his employees.In 1956 Bill established the Hazelett Strip-Casting Corporation on the shores of Lake Champlain in Mallets Bay to further his father’s pioneering work with the twin-belt continuous strip-caster. An ever persuasive and fiercely independent and charismatic soul, Bill thrived by encouraging his customers to work together to further their common interest in his relatively untried technology while he slowly expanded and commercialized the application of the twin-belt caster in both strip and billet production.Bill remained extremely close to his employees and he was rewarded by their dedication and long unique experience. Today, the company remains the only commercial supplier of twin-belt casters worldwide.He always insisted on maintaining fully integrated machine shops for both in-house development and timely customer service, a dedication often lacking in today’s machinery manufacturing industries. The holder of numerous patents, Bill always encouraged his engineers to try out new ideas drawing on the resources these facilities.Although not finding commercial success in numerous steel casting pilot programs, Bill’s perseverance resulted in the adaptation of the Hazelett twin-belt caster for continuous casting and inline rolling of aluminum in, what is often referred to as the thin-slab casting and rolling ‘mini-mill,’ as well as copper, zinc, and lead strip at over 45 installations worldwide. Additionally, 35 casters are employed in the above mentioned Contirod plants.Hazelett casters are currently operating in 25 countries and the vast majority of the companies business has always been overseas starting with Japan and Europe and now China, which currently is the companies dominate customer. For his efforts and leadership in taking American innovation overseas Bill was awarded the prestigious SBA Exporter of the Year Award by President Bush in 2001. This award is given annually to the owner of a small company that has increased sales through exports by using creative marketing strategies and effective solutions to export problems and in addition has shown a willingness to assist other small businesses in exportingThe company, which employs 140 people, remains family owned under the direction of Bill’s son David, who has been active in the business for 30 years. David has every intention of carrying on the legacy of his father in furthering one of a dwindling number of privately owned independent metals processing machinery manufacturers.Source: Hazelett Strip-Casting Corp. www.hazelett.com(link is external)last_img read more

Arsenal legend Martin Keown never saw Freddie Ljungberg as management material


first_imgArsenal legend Martin Keown never saw Freddie Ljungberg as management material Advertisement Advertisement Comment Freddie Ljungberg has made a slow start as interim Arsenal manager (Picture: Getty Images)Martin Keown admits that he never thought former Arsenal team-mate Freddie Ljungberg would become a manager and has offered him some advice for dealing with the current Gunners squad.Ljungberg is currently in interim charge of Arsenal after the sacking of Unai Emery, but has made a poor start, drawing with Norwich and losing to Brighton in his opening two games.The Swede is in contention to take the job on a permanent basis, if he can improve results, but Keown says his ‘individualistic’ nature as a player did not paint him as an obvious choice for management.‘He’s a fiercely competitive individual,’ Keown told talkSPORT.AdvertisementAdvertisementADVERTISEMENT‘I never saw him as management or a coach, he was quite an individualistic player, he did everything his own way, but that maybe helps him to be a very good manager. Phil HaighFriday 6 Dec 2019 1:54 pmShare this article via facebookShare this article via twitterShare this article via messengerShare this with Share this article via emailShare this article via flipboardCopy link Martin Keown (far left) and Freddie Ljungberg (centre) played together at Arsenal from 1998-2004 (Picture: Getty Images)Keown recognises the huge problems that Ljungberg has taken on and admits that significant changes are needed in defence and midfield, calling out both Mesut Ozil and David Luiz for their attitude.‘We shouldn’t expect a magic wand because this has been a problem that’s been in the making for some time,’ continued the former defender. ‘Emery obviously inherited it and he didn’t find a solution.‘It was about changing personnel, recruitment so you needed central defenders that wanted to defend, loved defending, they’re not there.‘We need different midfield players. The likes of Ozil, if they don’t want to toe the line, they don’t want to play, for now you’ll have to upset one or two.More: FootballRio Ferdinand urges Ole Gunnar Solskjaer to drop Manchester United starChelsea defender Fikayo Tomori reveals why he made U-turn over transfer deadline day moveMikel Arteta rates Thomas Partey’s chances of making his Arsenal debut vs Man City‘I would pull David Luiz to one side and say “I’m just going to sit you out for now” I don’t want you to go completely against the group or against me, but I’m looking at something else for now.‘He seems to be the biggest culprit for wanting to shrink away or drop off.‘The midfield is an issue because the midfield just disappear.’With the defeat to Brighton, Arsenal slipped to 10th in the Premier League and just five points above the relegation zone having won four of their 15 league games this campaign.Their next chance to improve their fortunes comes away to West Ham on Monday night as they look to end a winless run which stretches back nine matches.MORE: Diego Simeone dismisses talk of an Atletico Madrid exit amid Arsenal linksMORE: Arsenal star Nicolas Pepe blasted for worst warm-up of all time by Clive Tyldesley & Alan Shearerlast_img read more

USC prepares to defend Texas Invitational title


first_imgUSC’s men’s and women’s swim teams are headed off to the Lone Star State this weekend to compete in the Texas Invitational in Austin, Tex.Starting gun · Last year, the Women of Troy won the Texas Invitational when it was called the USA Swimming Winter National Championships. – William Ehart | Daily TrojanThe tournament will mark the first time the swimmers have competed since early November, when they, along with their diving teammates, swept Arizona and Arizona State to maintain an undefeated fall season.Senior Meghan Hawthorne impressed on the women’s side, winning four combined individual events against the Wildcats and Sun Devils, while senior Dimitri Colupaev stepped up for the men’s team, also winning four individual events. Seniors Kasey Carlson and Stina Gardell, along with sophomores Kendyl Stewart and Jasmine Tosky, have also been instrumental in leading the women’s team to success, and juniors Cristian Quintero and Luca Spinazzola have complemented Colupaev’s success on the men’s side.Last year, the annual Texas Invitational was called the USA Swimming Winter National Championships. The Women of Troy won the event, while the men’s team took third.At the Texas Invitational this weekend, USC will face competitors from Texas, BYU, Arizona, UC Santa Barbara, Wisconsin, Harvard, Penn State, University of the Incarnate Word and Oklahoma Baptist — the winners of last year’s National Association of Intercollegiate Athletics championship. UCLA will also compete, but only on the women’s side.USC’s women’s team enters the tournament ranked No. 6 in the nation by the College Swimming Coaches Association of America, while the men are ranked No. 7. Texas and Arizona are the only other ranked men’s squads, at No. 4 and No. 15, respectively. On the women’s side, Arizona is ranked No. 13, UCLA is ranked No. 19 and Penn State is ranked No. 24.Though the tournament comprises individual competitions, USC will be sending nearly its whole team to compete. The meet will feature all 18 of the swimming events contested at the NCAA championships, so it provides a great chance for the Trojans to sharpen their skills after a fairly light fall season.The Texas Invitational begins Thursday and runs until Saturday.last_img read more

Paul Clement reveals why John Terry turned down Swansea interest to join Villa


first_imgPaul Clement says John Terry snubbed a move to the Premier League as he didn’t want to play against his beloved Chelsea next season.The Swansea City boss was among a host of top-flight bosses keen to land the ex-England captain on a free transfer this summer following his departure from Stamford Bridge.But Terry has opted to drop into the Championship to join Aston Villa and Clement, who enjoys a close relationship with the 36-year-old dating back to his time on the coaching staff at Chelsea, fully respects his decision.Speaking exclusively to Jim White on talkSPORT, he said: “My understanding of the situation is that, with John and his relationship with Chelsea, he was going to find it difficult to be a direct competitor of them in the Premier League.“John is someone I know very well and have a lot respect for and have a good relationship with. Having known him since he was 16 years old and worked with him as well in the later years when I was an assistant at Chelsea, I understand very well his situation.“He has made a sensible choice. Aston Villa are a very good club, they have got a good manager, they have got a nice infrastructure there. “I think he is getting that balance between wanting to continue to play at a good level but at the same time not wanting to pull at his heartstrings really because it was difficult for him leaving Chelsea.”It’s been a quiet summer on the transfer front for Swansea so far, with Dutch goalkeeper Erwin Mulder the only new arrival at the Liberty Stadium.Clement says he is ‘getting close’ to securing more deals, with a striker top of his wishlist after Fernando Llorente fractured a bone in his arm in a freak accident while on holiday.But he insists there is no need to have a massive overhaul of his squad, saying: “We are just looking to strengthen in a couple of areas.“We wanted to do something in that position [striker] even before Fernando got the injury to his arm, so that becomes even more of a priority now.“We are hopeful he will make the start of the season but we’re not sure if that is the case yet so that is a position we want to add to.”last_img read more

Mix Fruit Chaat


first_imgIngredients Pineapple (peeled)1/2 Watermelon (peeled)1/4 Apples (peeled)1/4 Pears2 Green Apples2 Muskmelon1/4 Plums (deseeded & quartered)2 Strawberries (halved)4-5 Cumin Seeds1 tsp Black Saltto taste Mint Leaves (fresh)4 sprigs Lemon Juice1 tbsp Chaat Masala2 tbsp Pomegranate Seeds¼Preparation Cut pineapple, plums, strawberries, watermelon, pears, apples, green apples and muskmelon into one-inch-sized pieces. Put all the cut fruits in a big bowl. Roast cumin seeds nicely and grind them. Add black salt, roasted cumin powder, lemon juice, chaat masala to the fruit chaat bowl and mix them well. Refrigerate the fruit chaat for 10 minutes. Put the chaat in a fruit or a vegetable cup (as shown in the picture). Garnish the fruit chaat with mint leaves and pomegranate seeds. (Courtesy: Executive Sous Chef, Tenzin Losel, Eros Hotel, Nehru Place, New Delhi)last_img read more