中山拉屎带血怎麽回事(中山市哪家医院做肠手术最好) (今日更新中)

Hot weather can increase the risk of natural disasters like droughts and wildfires, now, there is evidence extreme heat can increase harmful chemicals in the air.A study published recently in Science Advances looked at asphalt under different temperature conditions.“A main finding is that asphalt-related products emit substantial and diverse mixtures of organic compounds into the air, with a strong dependence on temperature and other environmental conditions,” says Peeyush Khare, a Yale chemical and environmental engineer and the lead author of the study, in a statement.The researchers took real-world samples of fresh road asphalt and put them in a controlled furnace with purified air. They heated the samples to temperatures between 104 and 392 degrees Fahrenheit, and measured the chemical components in the air.Total emissions nearly doubled when temperatures went from 104 to 140 degrees. At 104 degrees, 94 percent of the emissions measured were hydrocarbons.The group also exposed the asphalt samples to replicated solar heat, including UVA and UVB wavelengths, and found the rate of emission of potentially harmful chemicals increased. Showing that not only heat, but also solar radiation contributed to asphalt producing air pollution.Paved surfaces and roofs make up approximately 45% and 20% of surfaces in U.S. cities, respectively.Asphalt can be quite a bit hotter than the air around it, getting about 40 to 60 degrees warmer than the recorded air temperature.The researchers concluded that while policies and regulations have been put in place about car emissions and other forms of air pollution, asphalt should not be overlooked as a contributor.“It's another important non-combustion source of emissions that contributes to SOA (secondary organic aerosol) production, among a class of sources that scientists in the field are actively working to constrain better,” Drew Gentner, associate professor of chemical & environmental engineering, said. 1983

here’s what happens when you march on Portland Place in St. Louis, MOthey’re scared of their own community pic.twitter.com/Ng8qW1Pa6C— avery (@averyrisch) June 29, 2020 176

HENDERSONVILLE, Tenn. — A Merrol Hyde Magnet High School senior recalled what she saw in the hallway after a chemical flash fire occurred during a science experiment.Sophia Sisler said she was in the hallway working on an art display Wednesday morning when she heard screaming."A student started coming downstairs into the nurse's office. They were crying and shaking, kind of freaking out a little bit and some of them had soot on them. They were really red, they had red spots on their faces and arms and that sort of thing," she recalled.Sisler would soon learn about the chemical accident that caused a Science teacher and 11 other students to be sent to hospitals. Several suffered second degree burns."A couple had open blisters on their legs already. I think they were all just really panicked from what happened," she said.Sisler said the science department has done the science experiment in the past without any problems. After the accident, she said teachers escorted those exposed to the nurse’s office until emergency crews arrived."They were clinging onto the teachers really and they were crying and they were terrified," she said.She wanted people on social media not to blame the teacher for this accident. It's something that has been done in the past. "He looked them all in the eye while he was actively burning and holding his burn spot and saying 'it’s going to be OK, you’re going to be OK' and he got them all out of the room unbelievably fast and he put all of the students before his own life," Sisler said.The senior said she hopes all the students and teacher fully recover. 1655

Grammy-winning artist Adele is once again saying, "Hello," and this time its as host of "Saturday Night Live."Adele announced the news on her Instagram page, saying that her hosting gig will happen almost 12 years to the day she first appeared on the sketch comedy show.The songstress added that she is excited and "absolutely terrified" to host for the first time.H.E.R. will perform as the musical guest.According to US Magazine, this will mark her first appearance in three years. 491

Hawaiian authorities are urging sightseers to stay away as Leilani Estates residents return to check on their neighborhood, which is threatened by lava and toxic gases emerging from fissures in the subdivision.Big Island's Kilauea volcano erupted Thursday, spewing molten rock and high levels of sulfur dioxide.Cracks emerged in the volcano's East Rift Zone — an area of fissures miles away from the volcano's summit. All residents of Leilani Estates, a community of about 1,700 people near Big Island's eastern edge, and nearby Lanipuna Gardens were ordered to evacuate.The eruption was followed by a 6.9-magnitude earthquake Friday.As of Sunday, 10 fissures had opened and 26 homes had been destroyed. The Hawaiian Volcano Observatory said that active venting of lava and hazardous fumes continued. 818

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