6741期

最新文章

• A geographic history of human genetic ancestry AI翻译
  作者：Grundler, Michael C.; Terhorst, Jonathan; Bradburd, Gideon S.
  作者单位：University of Michigan System; University of Michigan; University of Michigan System; University of Michigan
  摘要：Describing the distribution of genetic variation across individuals is a fundamental goal of population genetics. We present a method that capitalizes on the rich genealogical information encoded in genomic tree sequences to infer the geographic locations of the shared ancestors of a sample of sequenced individuals. We used this method to infer the geographic history of genetic ancestry of a set of human genomes sampled from Europe, Asia, and Africa, accurately recovering major population move...
• The Decline and Fall of the Human Empire: Why Our Species Is on the Edge of Extinction Gee AI翻译
  作者：Woolfson, Adrian; Gee, Henry
• A high-temperature nanostructured Cu-Ta-Li alloy with complexion-stabilized precipitates AI翻译
  作者：Hornbuckle, B. C.; Smeltzer, J. A.; Sharma, S.; Nagar, S.; Marvel, C. J.; Cantwell, P. R.; Harmer, M. P.; Solanki, K.; Darling, K. A.
  作者单位：United States Department of Defense; US Army Research, Development & Engineering Command (RDECOM); US Army Research Laboratory (ARL); United States Army; Lehigh University; Arizona State University; Arizona State University-Tempe; Louisiana State University System; Louisiana State University
  摘要：We present a bulk nanocrystalline copper alloy that can operate at near-melting temperatures with minimal coarsening and creep deformation. The thermal stability of the Cu-3Ta-0.5Li atomic % (at %) alloy is attributed to coherent, ordered L12 Cu3Li precipitates surrounded by a tantalum-rich atomic bilayer phase boundary complexion. Adding 0.5 at % lithium to the immiscible Cu-Ta system changes the morphology of the nanoscale precipitates from spherical to cuboidal while simultaneously tailorin...
• New data fill long-standing gaps in the study of policing AI翻译
  作者：Knox, Dean; Mummolo, Jonathan
  作者单位：University of Pennsylvania; Princeton University
  摘要：Data show discrimination, but analysis must be more policy relevant
• 23andMe files for bankruptcy AI翻译
  作者：Brainard, Jeffrey
• In the ashes AI翻译
  作者：Cornwall, Warren
• Guiding science in China AI翻译
  作者：Kennedy, Andrew
  作者单位：Australian National University
• How did cow flu start? Scientists still don't know AI翻译
  作者：Kupferschmidt, Kai
• Complex-frequency excitations in photonics and wave physics AI翻译
  作者：Kim, Seunghwi; Krasnok, Alex; Alu, Andrea
  作者单位：City University of New York (CUNY) System; State University System of Florida; Florida International University; City University of New York (CUNY) System
  摘要：Closed, lossless optical cavities are characterized by a Hamiltonian that obeys Hermiticity, resulting in strictly real-valued resonance frequencies. By contrast, non-Hermitian wave systems are characterized by Hamiltonians with poles and zeros at complex frequencies, whose control through precise engineering of material loss and gain can lead to exotic scattering phenomena. Notably, excitation signals that oscillate at complex-valued frequencies can mimic the emergence of gain and loss, facil...
• NUCLEAR PHYSICS US collider starts last run AI翻译
  作者：Brainard, Jeffrey