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Objective To explore the anti corrosion ability of laser welded composite wire in artificial saliva con⁃ taining salivary amylase and pancreatic amylase, and to compare the effect of two kinds of amylase on corrosion resis⁃ tance of wire and its mechanism. Methods The corrosion resistance of composite wire was evaluated by electrochemi⁃ cal polarization and immersion test. The soluble corrosion products after 28 d immersion in artificial saliva were detect⁃ ed by plasma spectrometer. The surface morphology was analyzed by scanning electron microscope, energy spectrometer and atomic force microscope. Results Salivary amylase and pancreatic amylase could improve the corrosion resistance of the composite arch wire; the same isomerase would have different effects on the same alloy corrosion resistance. Con⁃ clusion When the new metal biological material is applied to the oral cavity, the amylase may have influence on its corrosion resistance.

To mimic the function of metallohydrolase, [M(bqad)Cl2] (M = Zn(II) (1), Co(II) (2), where bqad = N,N′-bis(2-quinolinylmethyl)amantadine), have been synthesized and characterized by elemental analysis, electronic absorption, IR, and single crystal X-ray diffraction. The structural analysis indicated that metal ions in1and2were coordinated by three nitrogens from bqad and two chlorides, resulting in a distorted trigonal bipyramidal geometry. Kinetic experiments for hydrolytic cleavage ofp-nitrophenyl acetate (pNA) catalyzed by1and2were performed at pH 7.50–10.00 and 298 K. The second-order rate constants (kobs) increased exponentially with variation of pH values. The Co(II) complex exhibited potent catalytic activity. [ABSTRACT FROM AUTHOR]

Sentinel-1 Terrain Observation by Progressive Scans (TOPS) data have been widely applied in earthquake studies due to their open-source policy, short revisit cycle and wide coverage. However, significant near-fault displacement gradients and the moderate azimuth resolution of TOPS data make achieving high-precision along-track measurements challenging, which prevents the generation of high-quality three-dimensional (3D) displacement maps. Here, we propose an integrated method to retrieve high-quality 3D displacements based on the differential interferometric SAR (DInSAR), burst-overlap interferometry (BOI), multiple-aperture InSAR (MAI) and pixel offset tracking (POT) techniques, which are achieved to use only two track Sentinel-1 TOPS data with different viewing geometries. The key step of this method is using a weighted fusion algorithm with the interpolated BOI-derived and MAI-derived 3D displacements. In a case study of the 2021 Maduo earthquake, the calculated root mean square errors (RMSEs) from global navigation satellite system (GNSS) data and the InSAR-derived 3D displacement fields were found to be 6.3, 5.8 and 1.7 cm in north–south, east–west and up–down components, respectively. Moreover, the slip model of the 2021 Maduo earthquake jointly estimated by DInSAR and BOI measurements indicates that this seismic event was dominated by sinistral strike-slip motion mixed with some dip-slip movements; the estimated seismic moment was 1.75 × 1020 Nm, corresponding to a Mw 7.44 event. [ABSTRACT FROM AUTHOR]