Liouville correspondences between multicomponent integrable hierarchies

Theoretical and Mathematical Physics - We establish Liouville correspondences for the integrable two-component Camassa–Holm hierarchy, the two-component Novikov $$($$ Geng–Xue $$)$$...     

Partially Overlapped Dual Laser Beams to Reduce Ablation Craters

We present our experimental ablation results for partially overlapped dual nanosecond laser beams(PO-DB)on metal and glass surfaces.Numerical simulations are performed to evaluate the crater reduction potential of the PO-DB setup.Damage probability experiments proved the collaboration of two beams within the overlap region.Bright-field and three-dimensional profile measurements verify the reduced ablation area from the proposed PODB scheme.Laser-induced plasma is generated when transparent glass is ablated.Atomic emission of Na I(~589.95nm)shows comparable signal between the PO-DB set and the traditional single laser beam set.The proposed PO-DB ablation mechanism could also be applied to femtosecond laser systems.     

Design Concepts of Transition Metal Dichalcogenides for High-Performance Aqueous Zn-Ion Storage

Aqueous Zn-ion batteries (AZIBs) are considered as promising large-scale energy storage devices due to their high safety and low cost. Transition metal dichalcogenides (TMDs) as the potential aqueous Zn-storage cathode materials are under the research spotlight because of their facile 2D ion-transport channels and weak electrostatic interactions with Zn²⁺. In this concept article, we summarize the intrinsic structural features and aqueous Zn-storage mechanisms of the TMDs-based electrodes. More significantly, the latest design concepts of TMDs materials for high-performance AZIBs are discussed in detail from three aspects of interlayer expansion engineering, phase transition engineering, and structure defects engineering. Finally, the current challenges facing TMDs cathodes and possible remedies are outlined for future developments towards efficient, rapid, and stable aqueous Zn-ion storage.     

Entire Transmission in Negative Directions through a Single Layer of Nanorods

We numerically investigate the regulation of beam direction by a single layer of high electrical permittivity nanorods with two kinds of cross-arranged radii. It is found that an oblique incident optical beam transmits more than 95% with a wide range wavelength of 80 nm near 1550 nm in a negative direction. In particular the efficiency can be up to 100% around the wavelength of 1550nm at a wide-range angle. The results are very promising for designing subwavelength optical elements to realize beam steering in optical integrated circuits.     

Combined Dynamic Kinetic Resolution and C−H Functionalization for Facile Synthesis of Non-Biaryl-Atropisomer-Type Axially Chiral Organosilanes

Although asymmetric C−H functionalization has been available for the synthesis of structurally diverse molecules, catalytic dynamic kinetic resolution (DKR) approaches to change racemic stereogenic axes remain synthetic challenges in this field. Here, a concise palladium-catalyzed DKR was combined with C−H functionalization involving olefination and alkynylation for the highly efficient synthesis of non-biaryl-atropisomer-type (NBA) axially chiral oragnosilanes. The chemistry proceeded through two different and distinct DKR: first, an atroposelective C−H olefination or alkynylation produced axially chiral vinylsilanes or alkynylsilanes as a new family of non-biaryl atropisomers (NBA), and second, the extension of this DKR strategy to twofold o,o′-C−H functionalization led to the multifunctional axially chiral organosilicon compounds with up to >99 % ee.     

Photo‐Powered Collapse of Supramolecular Polymers Based on an Overcrowded Alkene Switch

A supramolecular polymer was constructed from a light‐driven overcrowded alkene switch modified with two alkylated gallic acid amide pendants ( MSP‐1 ). Upon UV irradiation, stable MSP‐1 isomerized into unstable MSP‐2 , which induced the effective collapse of well‐defined cross‐linked supramolecular polymers, and the reassembly can be realized by aging at low temperature.