Super-resolution Imaging of Telescopic Systems based on Optical-neural Network Joint Optimization

Optical telescopes are an important tool for acquiring optical information about distant objects,and resolution is an important indicator that measures the ability to observe object details.However,due to the effects of system aberration,atmospheric seeing,and other factors,the observed image of ground-based telescopes is often degraded,resulting in reduced resolution.This paper proposes an optical-neural network joint optimization method to improve the resolution of the observed image by co-optimizing the point-spread function(PSF)of the telescopic system and the image super-resolution(SR)network.To improve the speed of image reconstruction,we designed a generative adversarial net(LCR-GAN)with light parameters,which is much faster than the latest unsupervised networks.To reconstruct the PSF trained by the network in the optical path,a phase mask is introduced.It improves the image reconstruction effect of LCR-GAN by reconstructing the PSF that best matches the network.The results of simulation and verification experiments show that compared with the pure deep learning method,the SR image reconstructed by this method is rich in detail and it is easier to distinguish stars or stripes.

耐甲氧西林金黄色葡萄球菌MLST联合SCCmec基因分型与耐药性分析

目的了解滨州医学院附属医院MRSA菌株多位点序列分型(MLST)联合SCCmec基因型分布和各种基因型的耐药特征。方法采用聚合酶链反应(PCR)对MRSA菌株进行MLST联合SCCmec基因分型;采用Walk WAY96PLUS PC33药敏板检测MRSA抗菌药物敏感性。结果 SCCmec基因分型结果以Ⅲ型为主(63/67株,占94.03%),MLST分型共检测出6种基因型:ST88、ST121、ST221、ST82、ST239及ST399,其中以ST239(61/67,91.04%)为主,耐药性分析显示SCCmecⅢ型MRSA菌株表现为多重耐药。结论ST239-MRSA-SCCmecⅢ型菌株为鲁北地区MRSA主要流行菌株,该型菌株对多种抗生素呈多重耐药;MLST联合SCCmec基因分型方法是MRSA遗传背景研究简便快速的方法。

Beyond 1,4-addition of in-situ generated(aza-)quinone methides and indole imine methides

The conjugate addition of in-situ generated(aza-)quinone methides(QMs)and indole imine methides(IIMs)emerged as a powerful protocol to access densely functionalized benzenes and indoles.Hydroxybenzyl alcohols,aminobenzhydryl alcohols,and varied indolylmethanols served as most effective precursors for the in-situ generation of such reactive species under acid conditions.The relevant propargylic alcohol has proven to be an elegant precursor to generate the propargylic-QMs and-IIMs via the acid promoted dehydration process,thus enabling diverse challenging remote activation to proceed conjugate1,6-and 1,8-additions.Moreover,the heteroarene has proven to be workable to transfer the LUMO of the p-QMs and 2-IIMs,thus inducing the remote nucleophilic dearomative additions.The conjugate additions of(aza-)p-QMs and varied IIMs has made significant contribution in the field of remote activation chemistry in past decade.This review summarizes the latest advances of the remote conjugate additions of the in-situ generated QMs and IIMs.

Electrochemical behavior of Ti-6Al-4V alloy in Hank's solution subjected to deep cryogenic treatment

The effect of deep cryogenic treatment(DCT)on the electrochemical behavior of Ti-6Al-4V alloy in Hank's solution was experimentally investigated in the present work.Deep cryogenic treatments at-196℃soaking for 24(DCT-24) and 48(DCT-48) hours were conducted on the commercial annealed Ti-6Al-4V alloy.The methods of polarization and electrochemical impedance spectroscopy(EIS) were employed to evaluate the electrochemical behavior and corrosion mechanism.Furthermore,atomic force microscopy(AFM) was used to detect the corrosion surface.The results showed that deep cryogenic treatment shifted the corrosion potentials(E_(corr))to the positive direction.The corrosion current densities(i_(corr))of samples treated by DCT-24 and DCT-48decreased from 153.1 nA·cm^(-2) in the untreated(UT)sample to 86.3 nA·cm^(-2) and 43.3 nA·cm^(-2),respectively.Furthermore,the roughness of corrosion surfaces of samples subjected to DCT was smaller than that of the UT sample,which indeed demonstrated the improvement in corrosion resistance of Ti-6Al-4V alloy in Hank's solution.The results of EIS test indicated that deep cryogenic treatment had no influence on the corrosion mechanism of Ti-6Al-4V alloy in Hank's,while enhanced resistance value of outer porous layer R_p,which makes the surface more efficient to prevent the corrosion.The reduction of β-phase particles,improvement in dislocation density and release of residual stress caused by deep cryogenic treatment had great contribution to the improvement in corrosion resistance of Ti-6Al-4V alloy in Hank's solution.

Mechanical Properties of Steels Treated by Q-P-T Process Incorporating Carbide-free-bainite/martensite Multiphase Microstructure

Quenching partitioning tempering （QP-T） process were applied to a quenched carbide-free bainite/mar- tensite （CFB/M） multiphase steel 40Mn2Si2Cr and its effect on the mechanical properties was studied. The results showed that the partitioning time of Q P T treatment can he increased greatly to 90 min or even longer. The tensile strength, elongation and product of strength and elongation （PSE） of the experimental steel can achieve 1650 MPa, about 20% and over 33 GPa ·%, respectively. The significant increase of partitioning time and excellent mechanical properties could be related to the CFB microstrueture introduced in the quenching process during the Q-P-T treat- ment.

Construction of polycyclic spirooxindoles through[3+2]annulations of Morita–Baylis–Hillman carbonates and 3-nitro-7-azaindoles

A mild and efficient dearomatic [3＋2] annulation reaction of 3-nitro-7-azaindoles and Morita Baylis Hillman carbonates from isatins was developed catalyzed by DMAP, affording the corresponding polycyclic spirooxindoles containing fused azaindoline architectures and vicinal quaternary centers in excellent yields（up to 96%） with high regio- and diastereoselectivity（dr 〉 19：1）. Moderate enantioselectivity（79% ee） was obtained by employing a chiral DMAP-type Lewis base catalyst.