Segregation of solutes to grain boundary(GB)is the dominant restriction on enhancement of mechanical properties and corrosion resistance during aging in precipitation-strengthened aluminum ***,we innovatively introduc...
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Segregation of solutes to grain boundary(GB)is the dominant restriction on enhancement of mechanical properties and corrosion resistance during aging in precipitation-strengthened aluminum ***,we innovatively introduce the cyclic deformation by the vibration during aging to eliminate the GB segre-gation,resulting in the formation of the narrow precipitate-free zone(PFZ)widths near the GB,as well as the fine and discontinuous grain boundary precipitations(GBPs).Compared with the traditional peak-aging,the 2014 aluminum alloy treated by thermal cooperative vibration aging(TCVA)exhibits a superb combination of impact toughness and corrosion resistance,and retains the strength and *** ad-dition,the atomic simulations show that TCVA generates numerous vacancies near the GB,but does not change the dislocation density with the increase of cycle *** results indicate that the vacancy significantly promotes the nucleation and growth of precipitates in the vicinity of GB,resulting in the narrow PFZs and fine discontinuous *** present work provides the fundamental knowledge and method to inhibit the equilibrium segregation of solutes to GB during aging,and further realizes the precipitation-strengthened aluminum alloys with excellent mechanical and corrosion properties.
As the core equipment of transmission and distribution hubs,the operational status of gas-insulated switchgear(GIS)is closely linked to the safety of the power ***,X-ray digital imaging technology has been extensively...
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As the core equipment of transmission and distribution hubs,the operational status of gas-insulated switchgear(GIS)is closely linked to the safety of the power ***,X-ray digital imaging technology has been extensively used in GIS equipment fault ***,the X-ray image of GIS is blurred,which is not conducive to the detection of tiny ***,a super-resolution method for GIS X-ray images based on multi-scale context transformers is proposed in this study,namely ***,a second-order image degradation model is introduced to generate GIS X-ray lowresolution images that more closely resemble the real ***,a contextual transformer gate module is constructed to improve attention to tiny defects in GIS X-ray ***,a U-Net discriminator network based on multi-scale contextual transformers is intended to enrich the information of the generated ***,the proposed discriminator is combined with the existing generator to compose a superresolution method applicable to GIS X-ray *** experimental results demonstrate that the method outperforms other methods in peak signal-to-noise ratio and structural similarity on the constructed GIS X-ray image *** addition,the output image of the proposed method facilitates the subsequent defect detection.
Enhancing neurological recovery and improving the prognosis of spinal cord injury have gained research attention *** cord injury is associated with a complex molecular and cellular *** complexity has prompted research...
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Enhancing neurological recovery and improving the prognosis of spinal cord injury have gained research attention *** cord injury is associated with a complex molecular and cellular *** complexity has prompted researchers to elucidate the underlying pathophysiological mechanisms and changes and to identify effective treatment *** approaches for spinal cord injury repair include surgery,oral or intravenous medications,and administration of neurotrophic factors;however,the efficacy of these approaches remains inconclusive,and serious adverse reactions continue to be a *** advancements in tissue engineering and regenerative medicine,emerging strategies for spinal cord injury repair now involve nanoparticle-based nanodelivery systems,scaffolds,and functional recovery techniques that incorporate biomaterials,bioengineering,stem cell,and growth factors as well as three-dimensional *** biomaterial scaffolds should not only provide structural support for neuron migration,adhesion,proliferation,and differentiation but also mimic the mechanical properties of natural spinal cord ***,these scaffolds should facilitate axon growth and neurogenesis by offering adjustable topography and a range of physical and biochemical *** three-dimensionally interconnected porous structure and appropriate physicochemical properties enabled by three-dimensional biomimetic printing technology can maximize the potential of biomaterials used for treating spinal cord ***,correct selection and application of scaffolds,coupled with successful clinical translation,represent promising clinical objectives to enhance the treatment efficacy for and prognosis of spinal cord *** review elucidates the key mechanisms underlying the occurrence of spinal cord injury and regeneration post-injury,including neuroinflammation,oxidative stress,axon regeneration,and *** review also briefly dis
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