Science

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• Negative refraction in hyperbolic hetero-bicrystals AI翻译
  作者：Sternbach, A. J.; Moore, S. L.; Rikhter, A.; Zhang, S.; Jing, R.; Shao, Y.; Kim, B. S. Y.; Xu, S.; Liu, S.; Edgar, J. H.; Rubio, A.; Dean, C.; Hone, J.; Fogler, M. M.; Basov, D. N.
  作者单位：Columbia University; University of California System; University of California San Diego; Columbia University; Kansas State University; Simons Foundation; Flatiron Institute; Max Planck Society
  摘要：We visualized negative refraction of phonon polaritons, which occurs at the interface between two natural crystals. The polaritons-hybrids of infrared photons and lattice vibrations-form collimated rays that display negative refraction when passing through a planar interface between the two hyperbolic van der Waals materials: molybdenum oxide (MoO3) and isotopically pure hexagonal boron nitride (h11BN). At a special frequency co0, these rays can circulate along closed diamond-shaped trajectori...
• OCEANS AWAY Is raising salmon on land the next big thing in farming fish? AI翻译
  作者：Stokstad, Erik
• US scientists brace for greater scrutiny of risky research-Expert panel recommends broader reviews of research involving pathogens or toxins that could have ?dual use? AI翻译
  作者：Kaiser, Jocelyn
• Protein decoys may battle COVID-19 and more AI翻译
  作者：Service, Robert F.
• New official worries Iran scientists AI翻译
  作者：[Anonymous]
• Liquid metal-based soft, hermetic, and wireless-communicable seals for stretchable systems AI翻译
  作者：Shen, Qingchen; Jiang, Modi; Wang, Ruitong; Song, Kexian; Vong, Man Hou; Jung, Woojin; Krisnadi, Febby; Kan, Ruyu; Zheng, Feiyu; Fu, Benwei; Tao, Peng; Song, Chengyi; Weng, Guoming; Peng, Bo; Wang, Jun; Shang, Wen; Dickey, Michael D.; Deng, Tao
  作者单位：Shanghai Jiao Tong University; North Carolina State University; Shanghai Jiao Tong University
  摘要：Soft materials tend to be highly permeable to gases, making it difficult to create stretchable hermetic seals. With the integration of spacers, we demonstrate the use of liquid metals, which show both metallic and fluidic properties, as stretchable hermetic seals. Such soft seals are used in both a stretchable battery and a stretchable heat transfer system that involve volatile fluids, including water and organic fluids. The capacity retention of the battery was similar to 72.5% after 500 cycl...
• Losing, and finding, a home AI翻译
  作者：Wanchisen, Barbara A.; Schweingruber, Heidi A.
  摘要：During one of our breakfasts several years ago, Barb revealed what felt like a dirty secret: I don't feel comfortable at academic research conferences anymore. We both felt that way, but were nonetheless shocked to have it out on the table. When we were academics-Heidi as a postdoc and a short stint as a research professor, Barb through tenure and beyond-small research conferences were our intellectual home. They were where we presented our data, learned about the newest discoveries in our fi...
• Seller's market A pair of historians explain how market fundamentalism leads to science denial AI翻译
  作者：Thorp, H. Holden
• Computer-aided key step generation in alkaloid total synthesis AI翻译
  作者：Lin, Yingfu; Zhang, Rui; Wang, Di; Cernak, Tim
  作者单位：University of Michigan System; University of Michigan; University of Michigan System; University of Michigan
  摘要：Efficient chemical synthesis is critical to satisfying future demands for medicines, materials, and agrochemicals. Retrosynthetic analysis of modestly complex molecules has been automated over the course of decades, but the combinatorial explosion of route possibilities has challenged computer hardware and software until only recently. Here, we explore a computational strategy that merges computer-aided synthesis planning with molecular graph editing to minimize the number of synthetic steps r...
• One carbon- four new bonds AI翻译
  作者：Nakano, Yuji; Lupton, David W.
  作者单位：Monash University