2024

最新文章

• Scientists flock to the eclipse AI翻译
  作者：Cummings, Sean
• The quantification of everything Digital data traces about our lives and preferences are pervasive and increasingly commodified AI翻译
  作者：Wai, Jonathan
  作者单位：University of Arkansas System; University of Arkansas Fayetteville; University of Arkansas System; University of Arkansas Fayetteville
  摘要：Digital data traces about our lives and preferences are pervasive and increasingly commodified
• Jailed conservationists freed AI翻译
  作者：[Anonymous]
• A magnetic massive star has experienced a stellar merger AI翻译
  作者：Frost, A. J.; Sana, H.; Mahy, L.; Wade, G.; Barron, J.; Le Bouquin, J. -b.; Merand, A.; Schneider, F. R. N.; Shenar, T.; Barba, R. H.; Bowman, D. M.; Fabry, M.; Farhang, A.; Marchant, P.; Morrell, N. I.; Smoker, J. V.
  作者单位：KU Leuven; European Southern Observatory; Royal Military College - Canada; Queens University - Canada; Centre National de la Recherche Scientifique (CNRS); Institut de Planetologie et d'Astrophysique de Grenoble (IPAG); Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Ruprecht Karls University Heidelberg; Tel Aviv University; Universidad de La Serena; Newcastle University - UK; Institute for Research in Fundamental Sciences IPM; Carnegie Institution for Science; University of Edinburgh
  摘要：Massive stars (those >= 8 solar masses at formation) have radiative envelopes that cannot sustain a dynamo, the mechanism that produces magnetic fields in lower-mass stars. Despite this, approximately 7% of massive stars have observed magnetic fields, the origin of which is debated. We used multi-epoch interferometric and spectroscopic observations to characterize HD 148937, a binary system of two massive stars. We found that only one star is magnetic and that it appears younger than its compa...
• Ultrahigh energy storage in high-entropy ceramic capacitors with polymorphic relaxor phase AI翻译
  作者：Zhang, Min; Lan, Shun; Yang, Bing B.; Pan, Hao; Liu, Yi Q.; Zhang, Qing H.; Qi, Jun L.; Chen, Di; Su, Hang; Yi, Di; Yang, Yue Y.; Wei, Rui; Cai, Hong D.; Han, Hao J.; Gu, Lin; Nan, Ce-Wen; Lin, Yuan-Hua
  作者单位：Tsinghua University; Chinese Academy of Sciences; Hefei Institutes of Physical Science, CAS; University of California System; University of California Berkeley; Chinese Academy of Sciences; Institute of Physics, CAS; Tsinghua University; Tsinghua University
  摘要：Ultrahigh-power-density multilayer ceramic capacitors (MLCCs) are critical components in electrical and electronic systems. However, the realization of a high energy density combined with a high efficiency is a major challenge for practical applications. We propose a high-entropy design in barium titanate (BaTiO3)-based lead-free MLCCs with polymorphic relaxor phase. This strategy effectively minimizes hysteresis loss by lowering the domain-switching barriers and enhances the breakdown strengt...
• Image library shows diversity of human bodies AI翻译
  作者：[Anonymous]
• Kink bands promote exceptional fracture resistance in a NbTaTiHf refractory medium-entropy alloy AI翻译
  作者：Cook, David H.; Kumar, Punit; Payne, Madelyn I.; Belcher, Calvin H.; Borges, Pedro; Wang, Wenqing; Walsh, Flynn; Li, Zehao; Devaraj, Arun; Zhang, Mingwei; Asta, Mark; Minor, Andrew M.; Lavernia, Enrique J.; Apelian, Diran; Ritchie, Robert O.
  作者单位：University of California System; University of California Berkeley; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; University of California System; University of California Irvine; United States Department of Energy (DOE); Pacific Northwest National Laboratory; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory
  摘要：Single-phase body-centered cubic (bcc) refractory medium- or high-entropy alloys can retain compressive strength at elevated temperatures but suffer from extremely low tensile ductility and fracture toughness. We examined the strength and fracture toughness of a bcc refractory alloy, NbTaTiHf, from 77 to 1473 kelvin. This alloy's behavior differed from that of comparable systems by having fracture toughness over 253 MPam(1/2), which we attribute to a dynamic competition between screw and edge ...
• Large-scale photonic chiplet Taichi empowers 160-TOPS/W artificial general intelligence AI翻译
  作者：Xu, Zhihao; Zhou, Tiankuang; Ma, Muzhou; Deng, Chenchen; Dai, Qionghai; Fang, Lu
  作者单位：Tsinghua University; Tsinghua Shenzhen International Graduate School; Tsinghua University
  摘要：The pursuit of artificial general intelligence (AGI) continuously demands higher computing performance. Despite the superior processing speed and efficiency of integrated photonic circuits, their capacity and scalability are restricted by unavoidable errors, such that only simple tasks and shallow models are realized. To support modern AGIs, we designed Taichi-large-scale photonic chiplets based on an integrated diffractive-interference hybrid design and a general distributed computing archite...
• US agency obstructs LGBTQ plus equity in science AI翻译
  作者：Freeman, Jonathan B.
  作者单位：Columbia University
• Probe bolsters model of ever-expanding universe AI翻译
  作者：Clery, Daniel
  摘要：Theorists intrigued by hints of weakening dark energy in largest yet 3D galaxy map