Mr Mattis is in South Korea, where he has been assuring Seoul it has America's continuing support.He also reconfirmed plans to deploy a US missile defence system in South Korea later this year.North Korea's repeated missile and nuclear tests and aggressive statements continue to alarm and anger the region.The US has a considerable military presence in South Korea and Japan, as part of a post-war defence deal. There are just under 28,500 US troops in the country, for which Seoul pays about $900m (£710m) annually.President Donald Trump has previously said he wants both South Korea and Japan to pay more towards maintaining that presence.      Â
Â
Thursday, 2 February 2017
The US Defence Secretary James Mattis has said any use of nuclear weapons by North Korea would be met with an "effective and overwhelming" response.
Mr Mattis is in South Korea, where he has been assuring Seoul it has America's continuing support.He also reconfirmed plans to deploy a US missile defence system in South Korea later this year.North Korea's repeated missile and nuclear tests and aggressive statements continue to alarm and anger the region.The US has a considerable military presence in South Korea and Japan, as part of a post-war defence deal. There are just under 28,500 US troops in the country, for which Seoul pays about $900m (£710m) annually.President Donald Trump has previously said he wants both South Korea and Japan to pay more towards maintaining that presence.      Â
Â
Â
Harry Potter author JK Rowling has hit back at Twitter users who threatened to burn her books following her criticism of President Trump.
Rowling's recent Twitter feed has been filled with her retweets criticising the president's recent travel ban.Some followers have taken umbrage with her stance, with several saying they have burned her books or plan to do so, and one suggesting she "should stay out of politics"
Harry Potter author JK Rowling has hit back at Twitter users who threatened to burn her books following her criticism of President Trump.
Rowling's recent Twitter feed has been filled with her retweets criticising the president's recent travel ban.Some followers have taken umbrage with her stance, with several saying they have burned her books or plan to do so, and one suggesting she "should stay out of politics"
Tuesday, 6 December 2016
LHCb observes two new baryon particles
Today the collaboration for the LHCb experiment at CERN's Large Hadron Colliderannounced the discovery of two new particles in the baryon family. The particles, known as the Xi_b'- and Xi_b*-, were predicted to exist by the quark model but had never been seen before. A related particle, the Xi_b*0, was found by the CMS experiment at CERN in 2012. The LHCb collaboration submitted a paper reporting the finding to Physical Review Letters.
Like the well-known protons that the LHC accelerates, the new particles are baryons made from three quarks bound together by the strong force. The types of quarks are different, though: the new X_ib particles both contain one beauty (b), one strange (s), and one down (d) quark. Thanks to the heavyweight b quarks, they are more than six times as massive as the proton. But the particles are more than just the sum of their parts: their mass also depends on how they are configured. Each of the quarks has an attribute called "spin". In the Xi_b'- state, the spins of the two lighter quarks point in the opposite direction to the b quark, whereas in the Xi_b*- state they are aligned.
Friday, 2 December 2016
Subscribe to:
Posts (Atom)