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Due to their reliability, affordability and high safety, rechargeable aqueous zinc ion batteries (ZIBs) have garnered a lot of attention. Nevertheless, undesirable long-term cycle performance and the inadequate energy density of cathode materials impede the development of ZIBs. Herein, we report a layered CaV4O9-MXene (Ti3C2Tx) composite assembled using CaV4O9 nanosheets on Ti3C2Tx and investigate its electrochemical performance as a new cathode for ZIBs, where CaV4O9 nanosheets attached on the surface of MXene and interlamination create a layered 2D structure, efficiently improving the electrical conductivity of CaV4O9 and avoiding the stacking of MXene nanosheets. The structure also enables fast ion and electron transport. Further discussion is conducted on the effects of adding MXene in various amounts on the morphology and electrochemical properties. The composite shows an improved reversible capacity of 274.3 mA h g−1 at 0.1 A g−1, superior rate capabilities at 7 A g−1, and a high specific capacity of 107.6 mA h g−1 can be delivered after 2000 cycles at a current density of 1 A g−1. The improvement of the electrochemical performance is due to its unique layered structure, high electrical conductivity, and pseudo capacitance behavior.

Objective: We conducted this meta-analysis to compare the efficacy of these two surgical methods by comparing the incidence of major evaluation indicators. Methods: The databases such as PubMed, Embase, the Cochrane Library, China National Knowledge Infrastructure, Wanfang, and VIP information databases were searched. Results: The satisfaction rate of patients with auricle reconstruction using expanded flaps was 86.5%, and the satisfaction rate of patients with auricle reconstruction using non-expanded flaps was 87.9%. The incidence of postoperative hematoma was 3.2% in patients with auricle reconstruction using expanded flaps and 18.9% in patients with auricle reconstruction using non-expanded flaps. The incidence of postoperative skin necrosis was 2.2% in patients with auricle reconstruction using expanded flaps and 4.1% in patients with auricle reconstruction using non-expanded flaps. The incidence of postoperative incision infection was 3.1% in patients with auricle reconstruction using expanded flaps and 0.9% in patients with auricle reconstruction using non-expanded flaps. The incidence of cartilage framework exposure was 2.2% in patients with auricle reconstruction using expanded flaps and 1.9% in patients with auricle reconstruction using non-expanded flaps. The incidence of postoperative scar hyperplasia was 3.8% in patients with auricle reconstruction using expanded flaps and 3% in patients with auricle reconstruction using non-expanded flaps. The publication bias of included literature was evaluated by Egger test. There was no publication bias in this Meta-analysis (P >.05). Conclusion: The auricle reconstruction using non-expanded flaps is dominant in four of the six evaluation indexes. Therefore, we believe that the auricle reconstruction using non-expanded flaps has better therapeutic effect in patients with microtia. Due to the limitations of this meta-analysis, the conclusions of this meta-analysis still need to be further verified. [ABSTRACT FROM AUTHOR]

In the cation of the title compound, C16H14N3+·Cl−·2H2O, the cyclohexa-1,3-diene ring displays a screw-boat conformation and the pyridine ring is slightly twisted with respect to the pyrazole ring with a dihedral angle of 4.56 (12)°. In the crystal, ions and water molecules are linked into a three-dimensional network by classical N—H...O, N—H...Cl, O—H...Cl and O—H...O hydrogen bonds and by π–π stacking interactions, with centroid–centroid distances of 3.7580 (14) and 3.7794 (14) Å.

In the title molecule, C9H8N2O2, the dihedral angle between the pyridine and the pyrrolidine rings is 64.58 (12)°. In the crystal structure, weak C—H...π-electron ring interactions stabilize the packing.