福州传感器系统综合实验装置(南通新能源镍基电池解剖模型) (今日更新中)

North Korea appeared to destroy at least three nuclear tunnels, observation buildings, a metal foundry and living quarters at its Punggye-ri nuclear test site on Thursday, in a process observed by invited international journalists.A CNN crew at the remote mountain site in the country's north witnessed explosions at nuclear tunnels 2, 3 and 4, from observation decks about 500 meters away.They were among two dozen journalists invited into the country to observe the apparent destruction of the site, which comes just weeks before a planned meeting between North Korean leader Kim Jong Un and US President Donald Trump.The journalists spent about 10 hours on the ground at the nuclear test site before leaving by train for the 12-hour journey back to the North Korean coastal city of Wonsan.North Korea announced on April 20 that the country had "realized nuclear weaponization," and would no longer need to test nuclear weapons. To demonstrate its commitment, it said it would destroy the nuclear test site.North Korea said inviting international media to the event would "ensure transparency of discontinuance of the nuclear test."Before the explosions, the journalists said they were invited to look inside three of the four tunnels, which appeared to be rigged with explosives, before moving a safe distance away to witness their detonation.The amount and type of explosives used were not described by the regime. The CNN journalists present described seeing "soccer ball" sized and shaped explosives, rigged alongside one another, visible for a distance of around 35 meters inside the tunnels.The journalists watched a succession of explosions, and when they were finished were allowed closer to inspect the damage. Each tunnel was caved in, with rubble blocking the entrance.There were no international experts in the invited group and no one was present who was able to assess the explosions in order to tell if they were deep enough to destroy the tunnels.North Korea has conducted six nuclear tests at the site, which lies more than 200 miles (370 kilometers) north of Pyongyang, the most recent and powerful of which was in September 2017.There are four tunnels at the site, although journalists only witnessed the destruction of three. A fourth tunnel used for one nuclear test in 2006 had already been shut down, North Korean officials said. The journalists were also shown two additional tunnels that the North Korean officials said had never been used before.Before Thursday's explosions, experts had warned that the tunnels' destruction could destroy valuable evidence of the state of North Korea's weapons program. They told CNN they would want to take samples, as well as radiation counters to assess the levels in the atmosphere.Journalists who attempted to take radiation measuring equipment into North Korea said it had been confiscated.Tom Cheshire, a correspondent with Britain's Sky News, said his team's satellite phone and radiation dosimeter -- a device to measure nuclear radiation -- was taken away by security at Wonsan airport. Chinese journalists also had equipment confiscated.?The-CNN-Wire 3131

NORFOLK, Va. - An Old Dominion University student wants to see more African-American Physicists.She and others are making efforts to make this a reality and they are looking for mentors in the Hampton Roads community.“I love Accelerated Physics,” Kat Watkins, a junior at ODU said. She is passionate about physics and has been since childhood.She recently started the group Society of Black Physicists at ODU.The American Institute of Physics found that fewer than four percent of bachelor’s degrees went to black students for Physics and there's a nationwide effort to change this and to increase the number of African American Physicists.“Knowing all of this, hearing these numbers and being in a very small population of people, it's very hard to find the representation,” said Watkins.With the support of her adviser Dr. Matthew Nerem, an ODU Professor, and other students, she created the organization.“To provide a place for a person of color to feel home, you may be the only one in your class, you may be the only one that you see, but your experience is not singular, you're not alone. So that's why I started S.B.P.,” said Watkins.Physics student Jade Hooper is also part of the group. “Right now, I'm pretty much, if not in all of my classes, most of them, not just the only black female, but the only black person in the classroom and so from that standpoint, it kind of puts me in a position where sometimes I don't feel comfortable,” said Hooper, “My colleagues who are not the minority, they never have to go into a classroom or a building and wonder am I going to be the only white person in the classroom.”“If we want to have a proper representation, based on the population size, we need to bring up the number of Ph.D... by like almost eight times,” said Dr. Nerem.Watkins said her group is looking for mentors throughout the Hampton Roads region to help the students. She said the students also are looking at ways to reach children in hopes of getting kids interested in Science, Technology, Engineering, and Math.“We really just want to spread our roots out into the community,” said Watkins, “We want to inspire little ones. We want to inspire young minds too.”“It’s very important that these teens and the students can see a representation, somebody like me and Kat who will make it in this field so that they have somebody to look up to,” said Hooper.“Studying physics just gives people the opportunity to try and explore the universe, what we're composed of,” said Dr. Nerem.You don't have to be African American to join the group or mentor, you just need to support their mission: "The mission of the Society of Black Physicists is to promote the professional development and well-being of ethnic minority STEM students within the international scientific community and within society at large. SBP seeks to develop and support efforts to increase opportunities for ethnic minorities and People of Color in physics and to increase their numbers and visibility of their scientific work. It also seeks to develop activities and programs that highlight and enhance the benefits of the scientific contributions that People of Color provide for the international community."“I would love to come back in 20 years to ODU and walk into the mathematical methods of physics class and see half of the class be people of color, that will be incredible. That would be awesome,” said Watkins.Click here to learn more and to visit their website.This story was first reported by Margaret Kavanagh at WTKR in Norfolk, Virginia. 3547

NOBLESVILLE, Ind. -- The teacher credited with stopping a school shooting at Noblesville West Middle School was released from the hospital on Saturday.Police say science teacher Jason Seaman, 39, tackled a student armed with two handguns who started firing in his classroom Friday morning. He was shot three times during the incident.Rep. Susan Brooks released a photo showing her meeting Saturday with Seaman at the school where the shooting occurred. 490

NEW YORK (AP) — A new government report shows that since the coronavirus pandemic began, the U.S. has seen 300,000 more deaths than it usually would.The Centers for Disease Control and Prevention has been tracking how many deaths have been reported and comparing them with counts seen in other years. Usually, between the beginning of February and the end of September, about 1.9 million deaths are reported. This year, it’s closer to 2.2 million – a 14.5% increase.The CDC says the coronavirus was involved in about two-thirds of the excess deaths. CDC officials say it’s likely the virus was a factor in many other deaths too. For example, someone with heart attack symptoms may have hesitated to go to a hospital that was busy with coronavirus patients.The largest segment of the excess deaths, about 95,000, were in elderly people ages 75 to 84. That was 21.5% more than in a normal year. But the biggest relative increase, 26.5%, was in people ages 25 to 44. Deaths in people younger than 25 actually dropped slightly.Deaths were up for different racial and ethnic groups, but the largest increase – 54% – was among Hispanic Americans.According to a printed study in the Journal of Hospital Medicine, since the pandemic began, the mortality rate among hospitalized patients dropped by 18 percentage points.Researchers said the patients in the study now have a 7.6% chance of dying, whereas they had a 25.6% chance of dying at the start of the pandemic. 1465

NEW YORK CITY — An Arizona man is dead after jumping out of a freezer at a New York City restaurant and charging at an employee with a knife.Police identified the man as 54-year-old Carlton Henderson of Cave Creek, Arizona.Police say on Sunday an employee at Sarabeth's restaurant in New York City opened the freezer door, and Henderson allegedly ran out screaming, "Away from me, Satan!"The restaurant worker was able to calm the man down but the man went into cardiac arrest and later died at an Upper West Side hospital.No one else in the eatery was injured.  585

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