Nacre is a biological material constituting the innermost Rod0.0 layer of the shells of gastropods and bivalves.It consists of polygonal tablets of aragonite, tessellated to form individual layers and having the adjacent layers as well as the tablets within a layer bonded by a biopolymer.Due to its highly complex hierarchical microstructure, nacre
In the article the author analyzes confl icts arising between scientists aiming at participation in the global science fi eld and scientists who are predominantly tied to the context of national science.These confl icts are examined via “academic capitalism”, “global capitalism” and «national elites» theories.The article considers collisi
In order to increase the joint strength, RFSSW is used to weld 2524-T3 aluminum alloys of aircraft skin.The joint Connection Mechanism is studied through the analysis of its appearance and microstructure by SM and metallographic microscope, The mechanical properties of the joint is investigated by tension-shear test and cross-tension test, and the
The publication of the proposed EFSA risk assessment guidance document of plant protection products for pollinators highlighted that there are no study designs for non-Apis pollinators available.Since no official guidelines exist for semi-field testing at present, protocols were proposed by the ICPPR non-Apis working group and two years of ring-tes
Abstract The swelling effect of high-pressure carbon dioxide (CO2) in coal seam is obvious.In the restrained deep formation, it is converted to stress acting on the wellbore Rails and the caprock.The action stress is concentrated near the wellbore and poses a threat to the cement-formation interface.Due to interface failure to micro-annulus, wellbo