Chao Deng

Israel urges civilians to move out of harm’s way, while families in Gaza say ‘there’s nowhere else to go.’

South Africa’s accusation drew an angry backlash in a nation formed in the aftermath of the Holocaust.

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Abstract Identifying cancer genes remains a significant challenge in cancer genomics research.

The pursuit of high- Tcsuperconductors has remained a long-thought goal within the field of condensed-matter physics and material science. Motivated by the recent experimental synthesis of SrH22and HfH14, here we use ab initio methods to study the phase diagram, electronic properties, lattice dynamics, and superconductivity of the ternary Sr-Hf-H system. Several stable and metastable hydrides are predicted, including P4/mmm−SrHfH16,P6 ¯ m2−SrHfH18, and P6 ¯ m2−SrHfH19. Furthermore, the isomorphic SrZrHx ( x=16, 18, and 19) is obtained by replacing Hf with Zr. Among all these ternary hydrides, hydrogen atoms form cages around the metal atoms. At 280 GPa, the calculations of electronic and phonon properties reveal that the van Hove singularity in the electronic density of states near the Fermi level plays a key role in the superconductivity of Sr(Hf,Zr)H18, and the Tcare 257 and 261 K, respectively. Our research may pave the way for finding high- Tcsuperconductors in ternary hydrides.

An efficient plasma compression scheme using azimuthally polarized light is proposed. Azimuthally polarized light possesses a donutlike intensity pattern, enabling it to compress and accelerate ions toward the optical axis across a wide range of parameters. When the light intensity reaches the relativistic regime of 1 0 1 8 W / c m 2, and the plasma density is below the critical density, protons can be compressed and accelerated by the toroidal soliton formed by the light. The expansion process of the soliton can be well described by the snowplow model. Three-dimensional particle-in-cell simulations show that within the soliton regime, despite the ion density exceeding ten times the critical density, the ions' energy is insufficient for efficient neutron production. When the light intensity increases to, and the plasma density reaches several tens of times the critical density, deuterium ions can be compressed to thousands of times the critical density and simultaneously accelerated to the MeV level by tightly focused azimuthally polarized light during the hole-boring process. This process is far more dramatic compared to the soliton regime and can produce up to neutrons in a few light cycles. Moreover, in the subsequent beam-target stage, neutron yield is estimated to exceed. Finally, we present a comparison with the results obtained using a radially polarized light to examine the influence of light polarization.

Historic Chinese enclaves have been springboards for recent Chinese migrants trying to set up their lives, even as more of them enter the U.S. without visas.

Long before Trump hit Beijing with tariffs, an American company making wire hangers won numerous trade cases involving Chinese hangers. Still it struggles to survive.

A decadeslong decline in manufacturing in rural, southern Virginia will make it all the more difficult for hundreds of laid-off factory workers.