2024

最新文章

• China's plan to control methane emissions AI翻译
  作者：You, Heyuan
  作者单位：Zhejiang University of Finance & Economics; University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine
• Deploying blood-based cancer screening AI翻译
  作者：Micalizzi, Douglas; Sequist, Lecia; Haber, Daniel
  作者单位：Harvard University; Harvard University Medical Affiliates; Massachusetts General Hospital; Harvard University; Harvard Medical School; Harvard University; Harvard Medical School; Harvard University Medical Affiliates; Massachusetts General Hospital; Howard Hughes Medical Institute
  摘要：AI-based risk assessment may enable personalized blood-based multicancer screening
• Designing policy for Earth's urban future AI翻译
  作者：Espey, Jessica; Keith, Michael; Parnell, Susan; Schwanen, Tim; Seto, Karen C.
  作者单位：University of Bristol; University of Oxford; University of Oxford; Yale University
  摘要：Global impacts of cities must be better conveyed to multilateral organizations
• Observation of millihertz-level cooperative Lamb shifts in an optical atomic clock AI翻译
  作者：Hutson, Ross B.; Milner, William R.; Yan, Lingfeng; Ye, Jun; Sanner, Christian
  作者单位：National Institute of Standards & Technology (NIST) - USA; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; Colorado State University System; Colorado State University Fort Collins
  摘要：Collective couplings of atomic dipoles to a shared electromagnetic environment produce a wide range of many-body phenomena. We report on the direct observation of resonant electric dipole-dipole interactions in a cubic array of atoms in the many-excitation limit. The interactions produce spatially dependent cooperative Lamb shifts when spectroscopically interrogating the millihertz-wide optical clock transition in strontium-87. We show that the ensemble-averaged shifts can be suppressed below ...
• Face recognition outpaces laws AI翻译
  作者：[Anonymous]
• Strong medicine for Argentina's beleaguered science AI翻译
  作者：Orfila, Maria de los Angeles
  摘要：Daniel Salamone, the country's new science head, faces skepticism as he touts new priorities and entrepreneurship
• Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433 AI翻译
  作者：Aharonian, F.; Benkhali, F. Ait; Aschersleben, J.; Ashkar, H.; Backes, M.; Martins, V. Barbosa; Batzofin, R.; Becherini, Y.; Berge, D.; Bernloehr, K.; Bi, B.; Boettcher, M.; Boisson, C.; Bolmont, J.; de Lavergne, M. de Bony; Borowska, J.; Bouyahiaoui, M.; Breuhaus, M.; Brose, R.; Brown, A. M.; Brun, F.; Bruno, B.; Bulik, T.; Burger-Scheidlin, C.; Caroff, S.; Casanova, S.; Cecil, R.; Celic, J.; Cerruti, M.; Chand, T.; Chandra, S.; Chen, A.; Chibueze, J.; Chibueze, O.; Cotter, G.; Dai, S.; Mbarubucyeye, J. Damascene; Djannati-Atai, A.; Dmytriiev, A.; Doroshenko, V.; Egberts, K.; Einecke, S.; Ernenwein, J. -P.; Filipovic, M.; Fontaine, G.; Fuessing, M.; Funk, S.; Gabici, S.; Ghafourizadeh, S.; Giavitto, G.; Glawion, D.; Glicenstein, J. -F.; Grolleron, G.; Haerer, L.; Hinton, J. A.; Hofmann, W.; Holch, T. L.; Holler, M.; Horns, D.; Jamrozy, M.; Jankowsky, F.; Jardin-Blicq, A.; Joshi, V.; Jung-Richardt, I.; Kasai, E.; Katarzynski, K.; Khatoon, R.; Khelifi, B.; Klepser, S.; Kluzniak, W.; Komin, Nu.; Kosack, K.; Kostunin, D.; Kundu, A.; Lang, R. G.; Le Stum, S.; Leitl, F.; Lemiere, A.; Lenain, J. -P.; Leuschner, F.; Lohse, T.; Luashvili, A.; Lypova, I.; Mackey, J.; Malyshev, D.; Malyshev, D.; Marandon, V.; Marchegiani, P.; Marcowith, A.; Marti-Devesa, G.; Marx, R.; Mehta, A.; Mitchell, A.; Moderski, R.; Mohrmann, L.; Montanari, A.; Moulin, E.; Murach, T.; Nakashima, K.; de Naurois, M.; Niemiec, J.; Noel, A. Priyana; Ohm, S.; Olivera-Nieto, L.; de Ona Wilhelmi, E.; Ostrowski, M.; Panny, S.; Panter, M.; Parsons, R. D.; Peron, G.; Prokhorov, D. A.; Puehlhofer, G.; Punch, M.; Quirrenbach, A.; Reichherzer, P.; Reimer, A.; Reimer, O.; Ren, H.; Renaud, M.; Reville, B.; Rieger, F.; Rowell, G.; Rudak, B.; Ricarte, H. Rueda; Ruiz-Velasco, E.; Sahakian, V.; Salzmann, H.; Santangelo, A.; Sasaki, M.; Schaefer, J.; Schuessler, F.; Schwanke, U.; Shapopi, J. N. S.; Sol, H.; Specovius, A.; Spencer, S.; Stawarz, L.; Steenkamp, R.; Steinmassl, S.; Steppa, C.; Streil, K.; Sushch, I.; Suzuki, H.; Takahashi, T.; Tanaka, T.; Taylor, A. M.; Terrier, R.; Tsirou, M.; Tsuji, N.; Unbehaun, T.; van Eldik, C.; Vecchi, M.; Veh, J.; Venter, C.; Vink, J.; Wach, T.; Wagner, S. J.; Werner, F.; White, R.; Wierzcholska, A.; Wong, Yu Wun; Zacharias, M.; Zargaryan, D.; Zdziarski, A. A.; Zech, A.; Zouari, S.; Zywucka, N.
  作者单位：Dublin Institute for Advanced Studies; Max Planck Society; Ruprecht Karls University Heidelberg; University of Groningen; Kapteyn Astronomical Institute; Institut Polytechnique de Paris; Ecole Polytechnique; Centre National de la Recherche Scientifique (CNRS); University of Namibia; North West University - South Africa; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Potsdam; Universite PSL; Observatoire de Paris; CEA; Centre National de la Recherche Scientifique (CNRS); Universite Paris Cite; Linnaeus University; Humboldt University of Berlin; Eberhard Karls University of Tubingen; Universite PSL; Observatoire de Paris; Universite Paris Cite; Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; Universite Paris Cite; Centre National de la Recherche Scientifique (CNRS); Universite Savoie Mont Blanc; University of Oxford; CEA; Universite Paris Saclay; University of Erlangen Nuremberg; University of Warsaw; University of Hamburg; University of Witwatersrand; Western Sydney University; University of Adelaide; Aix-Marseille Universite; Centre National de la Recherche Scientifique (CNRS); University of Innsbruck; Jagiellonian University; Universite de Bordeaux; Centre National de la Recherche Scientifique (CNRS); Nicolaus Copernicus University; Polish Academy of Sciences; Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences; Universite de Montpellier; Centre National de la Recherche Scientifique (CNRS); University of Amsterdam; Yerevan Physics Institute; Konan University; University of Tokyo; RIKEN
  摘要：SS 433 is a microquasar, a stellar binary system that launches collimated relativistic jets. We observed SS 433 in gamma rays using the High Energy Stereoscopic System (H.E.S.S.) and found an energy-dependent shift in the apparent position of the gamma-ray emission from the parsec-scale jets. These observations trace the energetic electron population and indicate that inverse Compton scattering is the emission mechanism of the gamma rays. Our modeling of the energy-dependent gamma-ray morpholo...
• A very energetic Galactic particle accelerator AI翻译
  作者：Bosch-Ramon, Valenti
  作者单位：Institut d'Estudis Espacials de Catalunya (IEEC)
  摘要：The most powerful plasma jets in the Milky Way emit very-high-energy gamma rays Since the 1912 discovery of cosmic rays (1), the origin of these extremely energetic particles has remained a mystery. Remnants of a star explosion (supernova) have been considered dominant sources of cosmic rays (2), at least for those originating in the Milky Way, but this may not be true at energies approaching peta-electron volts (1 PeV = 10(15) eV) (3, 4). Microquasars may also generate cosmic rays (5, 6), but...
• Is NASA too pessimistic about space-based solar power? AI翻译
  作者：Clery, Daniel
  摘要：Agency says orbiting power stations would be costly, but rocketry breakthroughs could make it economical
• Catalytic enantioselective reductive Eschenmoser-Claisen rearrangements AI翻译
  作者：Zhang, Guoting; Wodrich, Matthew D.; Cramer, Nicolai
  作者单位：Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne
  摘要：An important challenge in enantioselective catalysis is developing strategies for the precise synthesis of neighboring congested all-carbon quaternary stereocenters. The well-defined transition states of [3,3]-sigmatropic rearrangements and their underlying stereospecificity render them powerful tools for the synthesis of such arrays. However, this type of pericyclic reaction remains notoriously difficult to catalyze, especially in an enantioselective fashion. Herein, we describe an enantiosel...