6658期

最新文章

• Sustained by science AI翻译
  作者：Dean, Matthew Jordan
  作者单位：University of Illinois System; University of Illinois Urbana-Champaign
• News at a glance AI翻译
  作者：Servick, Kelly
• Management approaches to conserve Australia's marine ecosystem under climate change AI翻译
  作者：Bay, Line K.; Gilmour, James; Muir, Bob; Hardisty, Paul E.
  作者单位：Australian Institute of Marine Science
  摘要：Australia's coastal marine ecosystems have a deep cultural significance to Indigenous Australians, include multiple World Heritage sites, and support the nation's rapidly growing blue economy. Yet, increasing local pressures and global climate change are expected to undermine the biological, social, cultural, and economic value of these ecosystems within a human generation. Mitigating the causes of climate change is the most urgent action to secure their future; however, conventional and new m...
• Tissue adhesive semiconductors AI翻译
  作者：Wu, Sarah J.; Zhao, Xuanhe
  作者单位：Massachusetts Institute of Technology (MIT); Massachusetts Institute of Technology (MIT)
• Chemical upcycling of polyethylene, polypropylene, and mixtures to high-value surfactants AI翻译
  作者：Xu, Zhen; Munyaneza, Nuwayo Eric; Zhang, Qikun; Sun, Mengqi; Posada, Carlos; Venturo, Paul; Rorrer, Nicholas A.; Miscall, Joel; Sumpter, Bobby G.; Liu, Guoliang
  作者单位：Virginia Polytechnic Institute & State University; Shandong Normal University; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; United States Department of Energy (DOE); Oak Ridge National Laboratory; Center for Nanophase Materials Sciences; Virginia Polytechnic Institute & State University
  摘要：Conversion of plastic wastes to fatty acids is an attractive means to supplement the sourcing of these high-value, high-volume chemicals. We report a method for transforming polyethylene (PE) and polypropylene (PP) at similar to 80% conversion to fatty acids with number-average molar masses of up to similar to 700 and 670 daltons, respectively. The process is applicable to municipal PE and PP wastes and their mixtures. Temperature-gradient thermolysis is the key to controllably degrading PE an...
• Programming twist angle and strain profiles in 2D materials AI翻译
  作者：Kapfer, Maelle; Jessen, Bjarke S.; Eisele, Megan E.; Fu, Matthew; Danielsen, Dorte R.; Darlington, Thomas P.; Moore, Samuel L.; Finney, Nathan R.; Marchese, Ariane; Hsieh, Valerie; Majchrzak, Paulina; Jiang, Zhihao; Biswas, Deepnarayan; Dudin, Pavel; Avila, Jose; Watanabe, Kenji; Taniguchi, Takashi; Ulstrup, Soren; Boggild, Peter; Schuck, P. J.; Basov, Dmitri N.; Hone, James; Dean, Cory R.
  作者单位：Columbia University; Technical University of Denmark; Technical University of Denmark; Columbia University; Aarhus University; SOLEIL Synchrotron; Universite Paris Saclay
  摘要：Moire superlattices in twisted two-dimensional materials have generated tremendous excitement as a platform for achieving quantum properties on demand. However, the moire pattern is highly sensitive to the interlayer atomic registry, and current assembly techniques suffer from imprecise control of the average twist angle, spatial inhomogeneity in the local twist angle, and distortions caused by random strain. We manipulated the moire patterns in hetero- and homobilayers through in-plane bendin...
• NASA scales back its next flagship climate mission AI翻译
  作者：Voosen, Paul
• Plastic waste recycling is gaining momentum AI翻译
  作者：Van Geem, Kevin M.
  作者单位：Ghent University
• Wafer-scale δ waveguides for integrated two-dimensional photonics AI翻译
  作者：Lee, Myungjae; Hong, Hanyu; Yu, Jaehyung; Mujid, Fauzia; Ye, Andrew; Liang, Ce; Park, Jiwoong
  作者单位：University of Chicago; Seoul National University (SNU); University of Chicago; University of Chicago
  摘要：The efficient, large-scale generation and control of photonic modes guided by van der Waals materials remains as a challenge despite their potential for on-chip photonic circuitry. We report three-atom-thick waveguides-delta waveguides-based on wafer-scale molybdenum disulfide (MoS2) monolayers that can guide visible and near-infrared light over millimeter-scale distances with low loss and an efficient in-coupling. The extreme thinness provides a light-trapping mechanism analogous to a delta-p...
• Extreme glacial cooling likely led to hominin depopulation of Europe in the Early Pleistocene AI翻译
  作者：Margari, Vasiliki; Hodell, David A.; Parfitt, Simon A.; Ashton, Nick M.; Grimalt, Joan O.; Kim, Hyuna; Yun, Kyung-Sook; Gibbard, Philip L.; Stringer, Chris B.; Timmermann, Axel; Tzedakis, Polychronis C.
  作者单位：University of London; University College London; University of Cambridge; University of London; University College London; Natural History Museum London; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Centro de Investigacion y Desarrollo Pascual Vila (CID-CSIC); CSIC - Instituto de Diagnostico Ambiental y Estudios del Agua (IDAEA); Institute for Basic Science - Korea (IBS); Pusan National University; Pusan National University; University of Cambridge
  摘要：The oldest known hominin remains in Europe [similar to 1.5 to similar to 1.1 million years ago (Ma)] have been recovered from Iberia, where paleoenvironmental reconstructions have indicated warm and wet interglacials and mild glacials, supporting the view that once established, hominin populations persisted continuously. We report analyses of marine and terrestrial proxies from a deep-sea core on the Portugese margin that show the presence of pronounced millennial-scale climate variability dur...