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最新文章

• Avoiding fusion plasma tearing instability with deep reinforcement learning AI翻译
  作者：Seo, Jaemin; Kim, Sangkyeun; Jalalvand, Azarakhsh; Conlin, Rory; Rothstein, Andrew; Abbate, Joseph; Erickson, Keith; Wai, Josiah; Shousha, Ricardo; Kolemen, Egemen
  作者单位：Princeton University; Chung Ang University; Princeton University; United States Department of Energy (DOE); Princeton Plasma Physics Laboratory; Princeton University
  摘要：For stable and efficient fusion energy production using a tokamak reactor, it is essential to maintain a high-pressure hydrogenic plasma without plasma disruption. Therefore, it is necessary to actively control the tokamak based on the observed plasma state, to manoeuvre high-pressure plasma while avoiding tearing instability, the leading cause of disruptions. This presents an obstacle-avoidance problem for which artificial intelligence based on reinforcement learning has recently shown remark...
• A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst AI翻译
  作者：Yang, Yu-Han; Troja, Eleonora; O'Connor, Brendan; Fryer, Chris L.; Im, Myungshin; Durbak, Joe; Paek, Gregory S. H.; Ricci, Roberto; Bom, Clecio R.; Gillanders, James H.; Castro-Tirado, Alberto J.; Peng, Zong-Kai; Dichiara, Simone; Ryan, Geoffrey; van Eerten, Hendrik; Dai, Zi-Gao; Chang, Seo-Won; Choi, Hyeonho; De, Kishalay; Hu, Youdong; Kilpatrick, Charles D.; Kutyrev, Alexander; Jeong, Mankeun; Lee, Chung-Uk; Makler, Martin; Navarete, Felipe; Perez-Garcia, Ignacio
  作者单位：University of Rome Tor Vergata; Istituto Nazionale Astrofisica (INAF); George Washington University; University System of Maryland; University of Maryland College Park; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; United States Department of Energy (DOE); Los Alamos National Laboratory; United States Department of Energy (DOE); Los Alamos National Laboratory; University of Arizona; University of New Mexico; George Washington University; Seoul National University (SNU); Istituto Nazionale di Ricerca Metrologica (INRIM); Istituto Nazionale Astrofisica (INAF); Centro Brasileiro de Pesquisas Fisicas; Centro Federal de Educacao Tecnologica Celso Suckow da Fonseca (CEFET-RJ); Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto de Astrofisica de Andalucia (IAA); Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Malaga; Beijing Normal University; Beijing Normal University; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Perimeter Institute for Theoretical Physics; University of Bath; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Massachusetts Institute of Technology (MIT); Northwestern University; Northwestern University; Korea Astronomy & Space Science Institute (KASI); Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
  摘要：Observationally, kilonovae are astrophysical transients powered by the radioactive decay of nuclei heavier than iron, thought to be synthesized in the merger of two compact objects1-4. Over the first few days, the kilonova evolution is dominated by a large number of radioactive isotopes contributing to the heating rate2,5. On timescales of weeks to months, its behaviour is predicted to differ depending on the ejecta composition and the merger remnant6-8. Previous work has shown that the kilono...
• A DNA clutch controls a golden nanomachine AI翻译
  作者：[Anonymous]
  摘要：The engine of a microscopic motor can be coupled or uncoupled from the rotor by means of DNA coatings that respond to a variety of stimuli.
• Introducing meatrice: grain with added muscles beefs up protein AI翻译
  作者：Coleman, Jude
  摘要：The laboratory-grown food uses rice as a scaffold for cultured meat.
• What a tease! Great apes pull hair and poke each other for fun AI翻译
  作者：[Anonymous]
  摘要：The animals' shenanigans hint that mischievous play evolved well before Homo sapiens did.
• Tutankhamun's magnificent coffin is revealed, and Charles Darwin gets a letter that he has to share AI翻译
  作者：[Anonymous]
• Bile salt hydrolase acyltransferase activity expands bile acid diversity AI翻译
  作者：Guzior, Douglas V.; Okros, Maxwell; Shivel, Madison; Armwald, Bruin; Bridges, Christopher; Fu, Yousi; Martin, Christian; Schilmiller, Anthony L.; Miller, Wendy M.; Ziegler, Kathryn M.; Sims, Matthew D.; Maddens, Michael E.; Graham, Stewart F.; Hausinger, Robert P.; Quinn, Robert A.
  作者单位：Michigan State University; Michigan State University; Michigan State University; Michigan State University College of Osteopathic Medicine; Michigan State University; Oakland University
  摘要：Bile acids (BAs) are steroid detergents in bile that contribute to the absorption of fats and fat-soluble vitamins while shaping the gut microbiome because of their antimicrobial properties1-4. Here we identify the enzyme responsible for a mechanism of BA metabolism by the gut microbiota involving amino acid conjugation to the acyl-site of BAs, thus producing a diverse suite of microbially conjugated bile acids (MCBAs). We show that this transformation is mediated by acyltransferase activity o...
• Largest post-pandemic survey finds trust in scientists is high AI翻译
  作者：Wong, Carissa
  摘要：Study of more than 70,000 people suggests that trust levels vary among countries and are linked to political orientation.
• Scientists under arrest: the researchers taking action over climate change AI翻译
  作者：Grossman, Daniel
  摘要：Fed up with a lack of political progress in solving the climate problem, some researchers are becoming activists to slow global warming.
• Science can drive development and unity in Africa - as it does in the US and Europe AI翻译
  作者：[Anonymous]
  摘要：Efforts to establish Africa's first continent-wide science fund have struggled. More needs to be done to get it up and running