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500米口径世界最大 中国天眼让我国射电天文领先世界20年_我的网站

一 |     After serving more than a month of in-school suspension over his dreadlocks, a Black student in Texas was told he will be removed from his high school and sent to a disciplinary alternative education program on Thursday.Darryl George, 18, is a junior at Barbers Hill High School in Mont Belvieu and has been suspended since Aug. 31. He will be sent to EPIC, an alternative school program, from Oct. 12 through Nov. 29 for “failure to comply” with multiple campus and classroom regulations, the principal said in a Wednesday letter provided to The Associated Press by the family.Principal Lance Murphy wrote that George has repeatedly violated the district's “previously communicated standards of student conduct." The letter also says that George will be allowed to return to regular classroom instruction on Nov. 30 but will not be allowed to return to his high school's campus until then unless he's there to discuss his conduct with school administrators.Barbers Hill Independent School District prohibits male students from having hair extending below the eyebrows, ear lobes or top of a T-shirt collar, according to the student handbook. Additionally, hair on all students must be clean, well-groomed, geometrical and not an unnatural color or variation. The school does not require uniforms.George's mother, Darresha George, and the family's attorney deny the teenager's hairstyle violates the dress code. The family last month filed a formal complaint with the Texas Education Agency and a federal civil rights lawsuit against the state’s governor and attorney general, alleging they failed to enforce a new law outlawing discrimination based on hairstyles. The family alleges George's suspension and subsequent discipline violate the state’s CROWN Act, which took effect Sept. 1. The law, an acronym for “Create a Respectful and Open World for Natural Hair,” is intended to prohibit race-based hair discrimination and bars employers and schools from penalizing people because of hair texture or protective hairstyles including Afros, braids, dreadlocks, twists or Bantu knots. A federal version passed in the U.S. House last year, but was not successful in the Senate.The school district also filed a lawsuit in state district court asking a judge to clarify whether its dress code restrictions limiting student hair length for boys violates the CROWN Act. The lawsuit was filed in Chambers County, east of Houston.George’s school previously clashed with two other Black male students over the dress code. Barbers Hill officials told cousins De’Andre Arnold and Kaden Bradford they had to cut their dreadlocks in 2020. Their families sued the district in May 2020, and a federal judge later ruled the district’s hair policy was discriminatory. Their pending case helped spur Texas lawmakers to approve the state’s CROWN Act. Both students withdrew from the school, with Bradford returning after the judge’s ruling. ___AP journalist Juan Lozano contributed to this report from Houston.___The Associated Press education team receives support from the Carnegie Corporation of New York. The AP is solely responsible for all content.。    据悉，位于贵州平塘的“中国天眼”FAST，是目前世界上最大、灵敏度最高的单口径射电望远镜，截至今年7月，它共观测发现660颗脉冲星。依靠它，我国探测宇宙天体的能力拓展到了137亿年前。在射电天文领域，我国已从落后，发展为领先世界20年。FAST由我国已故天文学家南仁东于1994年提出构想，历时22年建成，于2016年9月25日落成启用，进入调试期。

二 | 2020年1月11日，FAST通过国家验收，正式开放运行。从2021年开始，中国天眼’将向全球开放，全世界的科学家都可以使用这台世界上最大的射电望远镜，一起为探索宇宙的奥秘、推动人类文明的进步作贡献，构建人类命运共同体。”科学家通过FAST发现的脉冲星数量已经超过660颗，这个数量是同一时期、国际上所有射电望远镜发现脉冲星总数的 5倍以上。同时，FAST运行两年期间还帮助科学家们取得了一些重要的科学成果，这些科学成果包括5篇发表在《自然》上的论文、1篇发表在《科学》上的论文，其中一些科学成果还在2021年被《自然》评选为十大突破和发现。9月21日，FAST优先和重大科学研究团队在国际学术期刊Nature发表文章，对重复性快速射电暴FRB20201124A的起源进行了评估。该团队通过对这个源的深度观测取得的若干重要发现都是国际首次。

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