新的研究揭示了大恒星内部隐藏的过程
天文学家通常把大质量恒星称为宇宙的化学工厂。它们通常在壮观的超新星中结束生命,这些事件造就了元素周期表上的许多元素。元素如何……
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儿童医院的国家(formerly Children's National Health System, DC Children's Hospital, Children's National Medical Center) is a children's hospital in Washington, D.C. Ranked among the top 6 children's hospitals in the country by U.S. News & World Report, and located just north of the McMillan Reservoir and Howard University, it shares grounds with Washington Hospital Center, National Rehabilitation Hospital, and the DC Veterans Affairs Medical Center. Kurt Newman, M.D., has served as the president and chief executive officer of Children's National since 2011. Children's National is a not-for-profit institution that performs more than 450,000 visits each year. Featuring 323 beds and a Level IV NICU, Children's National is the regional referral center for pediatric emergency, trauma, cancer, cardiac and critical care as well as neonatology, orthopaedic surgery, neurology and neurosurgery.
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世界上使用最广泛的除草剂的化合物草甘膦可以削弱昆虫的免疫系统,暗示约翰霍金斯彭博公共卫生学院的研究人员的研究。草甘膦是......
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在一项新的研究中,研究人员显示,3D打印可以用于制造只有几微米大小的高度精确和复杂的微型镜头。该微透镜可用于纠正成像过程中的颜色失真。
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当一块导电材料在其端部之一加热时,电压差可以在样品上积聚,这又可以转换为电流。这是所谓的塞贝克效应,基石......
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