郑州300度近视是几点几-【郑州视献眼科医院】,郑州视献眼科医院,郑州四十岁做近视准分子手术,郑州lasek手术,郑州眼睛散光能治吗,郑州高度近视会失明吗,郑州近视眼手术哪家好,郑州郑州医院眼科激光价位最底

ALPINE, Calif. (KGTV) - Snow and ice caused Caltrans to close down both direction of I-8 Thursday night from SR-79 (Japatul Valley Rd.) to E. Willows Dr.The closure went into effect around 10 p.m. Snow plows were on scene clearning lanes and dumping salt and sand.Below freezing temperatures are expected overnight, increasing the possibility of black ice. 364
A winter storm that caused Thanksgiving travel chaos will bring more high winds and snow Monday as it pushes northeast from the Midwest toward the lower Great Lakes.More than 1,000 flights were already canceled early Monday and more than 10 million people are under a blizzard warning due to the wintry conditions.Kansas Gov. Jeff Colyer issued a state of emergency declaration for the state and officials said road conditions were "treacherous" in some areas."We strongly recommend that you postpone travel plans, if possible; however, if you must be on the road, make sure your vehicle's emergency kit is stocked, your gas tank is full and your cell phone and charger are with you and someone knows your travel plans," the declaration reads.Kansas City International Airport was closed to flights arriving on the airfield due to low visibility caused by weather conditions but reopened Sunday evening, according to its Twitter account.More than 1,700 US flights were canceled Sunday, with delays to 5,091 flights, according to flight-tracking website FlightAware. Most were at Kansas City and Chicago's O'Hare International and Midway airports.Multiple roads were also closed because of whiteout conditions, according to the KanDrive website. The Kansas Department of Transportation tweeted late Sunday that Interstate 70 had reopened statewide but that there could be morning delays, with ice and wind blowing snow over just cleared highways.There were reports of snow as high as 16 inches in parts of Iowa, with other areas reporting 3 inches to 10 inches. Baileyville, Kansas, notched 10 inches and 7 inches fell in Salina, Kansas.The weather system was forecast to move into the Great Lakes region before hitting the Northeast on Monday, according to CNN meteorologist Haley Brink.More than 10 million people are under a blizzard warning.Nearly 20 million people were under a high-wind advisory. This includes residents of Kansas and some in parts of Missouri, Nebraska and Iowa. Wind reports from the Central Plains clocked wind gusts at tropical storm force from 50 to 75 mph from Nebraska to Texas.Fort Hays State University student Brooks Barber captured the blizzard conditions in Hays, Kansas, on Sunday morning. Streets were dark, and many were without power, he said.The National Weather Service Quad Cities office posted a video of a weather balloon being released in a blizzard.Whiteout conditions brought low visibility to the small town of Chariton, Iowa, which is an hour south of Des Moines.By Monday morning, many areas from the Plains to the Midwest will have seen 6 to 10 inches of snow, CNN meteorologist Michael Guy said. As the low pressure passes, areas behind the system will continue to see more snow through Monday evening with up to a foot possible before the skies clear.The storm is moving to the lower Great Lakes, making its way toward New England by Tuesday. Parts of Michigan, the eastern shores of Lake Erie, as well Maine could see up to a foot or more of snow before the storm exits the US by Wednesday morning, Guy said.The major metropolitan areas in the Northeast will see wind and rain Monday into Tuesday. Wind gusts from 30 mph to 45 mph are possible as the system passes and temperatures drop through midweek. 3264

Academy Award-nominated actress and director Sondra Locke, whose body of work included multiple collaborations with Clint Eastwood, has died. She was 74.Locke died in November at her home in Los Angeles, according to a death certificate obtained by CNN.She had been battling bone and breast cancer.Locke made her film debut in 1968's "The Heart Is a Lonely Hunter" opposite Alan Arkin. Her performance earned her an Oscar nomination.She'd go on to star in several more films, including a notable stretch of movies alongside Eastwood. Locke and Eastwood dated for more than a decade until they split, which Locke later alleged damaged her career.She detailed their relationship and post-breakup turmoil in her 1997 book "The Good, the Bad and the Very Ugly."Locke notched four directors credits during her career, for films like "Ratboy" and "Impulse."Rosanna Arquette, who starred in the Locke-direced film "Trading Favors," remembered Locke as "thoughtful and kind" in a message posted to Twitter."[Locke] had laser vision she was great with actors," she wrote.Actress Evan Rachel Wood added: "#SondraLocke directed me in my first film when I was 4 years old. She was fantastic. RIP." 1198
According to a recent paper, the Earth is caught directly in the crosshairs of a cosmic hurricane.A swarm of nearly 100 stars, accompanied by an even greater amount of dark matter, is aimed directly at our stellar neighborhood and there's nothing we can do to stop it; in fact, the vanguard is already upon us. This sounds like a perfect summer blockbuster movie, starring The Rock and Chris Pratt, or maybe Scarlett Johansson and Charlize Theron.Except this is for real. But is it a danger? Well, actually, no. Not at all. But it's potentially incredibly fascinating, with lots of interesting scientific interconnections. So, what is really going on?The story starts last April, when the Gaia satellite announced the locations and trajectories of 2 billion stars in the vicinity of the Milky Way surrounding our sun. They released the data to the public.Scientists were then able to look at the data set to see if they could spot anything peculiar. In galaxies like the Milky Way, the most common behavior is that the stars orbit the center of the galaxy in a manner broadly similar to the planets orbiting our sun. However, there are some stars that exhibit unusual motion. About a year ago, astronomers identified some "stellar streams" passing through our celestial neighborhood.One of them, called S1 (for stream 1), consists of nearly 100 stars of similar age and composition, orbiting the Milky Way in a direction exactly opposite that of normal stars. It's kind of like a handful of cars driving the wrong way down the highway, except with a much greater distance between them and with no likelihood of a collision. These stars are spread out over a few thousand light years and they will pass through the solar system's neighborhood over the course of a few million years.Astronomers identified S1 as being part of the remnants of a dwarf galaxy that collided with the Milky Way and was consumed in an epic episode of cosmic cannibalism. Dwarf galaxies are very small, typically about 1% the mass of the Milky Way. They can orbit larger galaxies and collide with the bigger galaxy, adding their mass to the parent. This is what appears to have happened in the case of S1, although the process has taken probably a billion years.Dwarf galaxies often have a disproportionately large fraction of dark matter. Dark matter is a hypothetical and still-undiscovered form of matter that interacts only gravitationally. Scientists have proposed its existence to explain many astronomical mysteries, for example the observation that most galaxies rotate faster than can be explained by the known laws of physics and the stars and gas of which they are composed.While dark matter has not yet been observed, hypothesizing its existence is the simplest and most economical explanation for myriad astronomical mysteries. Averaged over the entire universe, dark matter is thought to be five times more prevalent than the ordinary mass of stars and gas and planets.In dwarf galaxies, the fraction of dark matter is often higher. In Fornax, a well-studied dwarf galaxy orbiting the Milky Way, researchers estimate that the dark matter is between 10 and 100 times greater than the mass found in its stars.If that number holds for S1, the dark matter of the S1 stream is passing through the Earth at a much higher velocity than the more ordinary dark matter that orbits the Milky Way -- about twice as fast. It is thought that S1 dark matter is flying through the solar system at a speed of about 550 km/s, or about 1.2 million mph. While these numbers are impressive, they are misleading. Dark matter, if it exists, is extremely diffuse and it will have no discernible effect on the solar system.Because dark matter hasn't been observed yet, these velocity numbers are speculative, although they are strongly supported by a very large body of evidence. However, the prospect of high velocity dark matter flying through the Earth has suggested an opportunity to detect it.In a paper in the prestigious journal Physical Review D, researcher Ciaran O'Hare and his collaborators calculated the possibilities of discovering dark matter using both existing and proposed dark matter detectors. They considered two varieties of dark matter particles: a very heavy kind called a WIMP (weakly interacting massive particle) and a very light kind called an axion. Because the ultimate nature of dark matter is not known, it is important to be open to all possibilities.They found that the detectors they evaluated could find WIMPs for certain ranges of the particle mass. However, when they looked at the axion possibility, it appeared the prospects were even better. Because of its light mass and the manner in which an axion would interact with the detector, the apparatus simply has a better chance of seeing the axion. (If axions exist, of course.)Experiments with names like ADMX, MADMAX and ABRACADABRA are able or will be able to search for the signatures of dark matter proposed in the recent paper. They consist of technologies that are designed to interact with axions in a strong magnetic field and convert them to ordinary microwaves or radio waves that can be easily detected.It's important to remember that the S1 stream poses no credible threat to the Earth and humanity. There is no need for an action hero to save us. However, the synergy of science is staggering. A careful catalog of nearby stars has opened the prospect of a better possibility of finding and identifying dark matter, which is one of the great unanswered mysteries of modern physics. It's an amazing time we live in, in which we can study such things.\ 5625
Alyson McClaran is a photojournalist who has captured many of the raw moments and emotions in 2020, including a photo of nurses blocking protestors in Colorado earlier this year.“The nurse kind of put his hands out,” McClaran said. “Then, the gentleman got in his face and the nurse just looked away from him and ignored him.”That photo would end up gaining international attention. “Within 30 minutes, I had thousands of shares,” she said. And for good reason.“I remember when I first saw it, it was really striking,” Hahrie Han, professor of political science at Johns Hopkins University, said. “It sort of felt like it brought together a lot of the complex streams of conflict and tension that we were having to grapple with as a society.”Han was chosen as a curator for a COVID-19 time capsule created by the non-profit Social Science Research Council, or SSRC. She chose McClaran’s photo.“The act of both people in that picture was an act of trying to make change in some way,” she said. “The people in the cars who are protesting are protesting against the shutdown order and they're using their right to free assembly and free speech to voice their concern. And likewise, the healthcare worker is standing up against that saying, 'No, we want people to stay home because that's how you’re going to protect us. That's how we are going to protect each other.'”As we close out this dynamic year, the SSRC decided to create this time capsule, not only for future social researchers but for the general public, as a reflection on 2020.The content ranges from ironic toilet paper shortage-related memes to images of hope and human connection.“They were like instant artifacts of that moment and there were a lot of those moments,” Alexa Dietrich, program director at the Social Science Research Council, said. “I believe it has accomplished a set of goals in the sense that bringing this type of analysis and perspective to much broader audiences.”Dietrich said the capsule is meant to bring about ongoing reflection, just as these curators had to do when coming up with their selections to put in the project.“That image I chose is the sort of 'how would you like to pay?' sign you'd see at any retail store or restaurant. But instead of having just the Visa, Mastercard, or Amex, it also has a roll of toilet paper,” said Bill Maurer, professor of anthropology and law at UC Irvine and another curator for the time capsule. “It really spoke to things like the concerns over hoarding that were taking place early on the pandemic, particularly around toilet paper. But, then, also that broader philosophical question, when you're in a global pandemic and there is an economic shutdown, what really is valuable anymore?”The time capsule is part of a bigger project the SSRC is putting together, free of use, to offer a range of perspectives and thoughts on the past year. “We’re not just delivering, we’re also really trying to learn and promote conversations,” Dietrich said.“The world is just in this moment of dynamism and flux and so to take this snapshot this moment in time, to think about what we want to capture and to create a historical record for future generations, I think is really important,” Han said. 3225
来源:资阳报