High-performance yttrium oxide-phenolic resin(Y_(2)O_(3)-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y_(2)O_(3...High-performance yttrium oxide-phenolic resin(Y_(2)O_(3)-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y_(2)O_(3)-coated PF(Y_(2)O_(3)/PF)powder was firstly sprayed onto the substrate,forming a transition layer,and then the spherical Y_(2)O_(3) powder and Y_(2)O_(3)/PF powder were alternately deposited to form the composite alternating coating.Results show that the alternating coating is mainly composed of deposited Y_(2)O_(3)/PF powder.The bonding strength between coating and substrate is as high as 26.48 MPa with the single-test maximum bonding strength of 28.10 MPa,and shear strength reaches 24.30 MPa.Additionally,the heat transfer effect caused by external Y_(2)O_(3) particles gradually softens and even melts PF,thus effectively avoiding the damage of high temperature to molecular structure and thereby promoting the crosslinking and curing effects of resin during the deposition process.In the meantime,the unmelted Y_(2)O_(3) powder results in the shot peening effect,which washes out and eliminates the powder particles with inferior deposition effect,ultimately improving the physical and chemical properties of the alternating coating.展开更多
An artificially accelerated alternation of aging and seawater erosion test of rubber materials used in lead rubber bearing(LRB)was performed,mainly to study the time-varying laws of rubber materials mechanical propert...An artificially accelerated alternation of aging and seawater erosion test of rubber materials used in lead rubber bearing(LRB)was performed,mainly to study the time-varying laws of rubber materials mechanical properties.Time-varying laws of the Mooney–Rivlin and Neo-Hookean constitutive parameters of rubber materials under the alternation of aging and seawater erosion were also analyzed.Results indicate that the rubber material mechanical properties were significantly affected by alternation of aging and seawater erosion.Hardness and elongation stress increased exponentially with test time.And 120 days after the test,the hardness increased by 14%,the maximum percentage increase in stress of 124.76%occurred at 100%constant elongation and the minimum percentage increase in stress of 68.32%occurred at 300%constant elongation;Tensile strength and elongation at break decreased by 44.96%and 53.09%.Besides,constitutive parameters of Mooney–Rivlin and Neo-Hookean all changed greatly with test duration.Finally,time-varying laws of constitutive parameters were verified by comparing the simulated and experimental results of the lead rubber bearing’s stiffness.Research results are of great significance to the seismic performance research and life-cycle performance analysis of offshore traffic engineering such as cross-sea bridges and bridges in the marine environment.展开更多
High dielectric constant (high-k) materials are vital to the nanoelectronic devices. The paper reviews research development of high-k materials, describes a variety of manufacture technologies and discusses the applic...High dielectric constant (high-k) materials are vital to the nanoelectronic devices. The paper reviews research development of high-k materials, describes a variety of manufacture technologies and discusses the application of the gate stack systems to non-classical device structures.展开更多
On June 5,2025,with the theme“Co-drive Sustainable Journey,Cocreate for Shared Success”,BASF participates in the 2025 Shanghai International Carbon Neutrality Expo in Technologies,Products and Achievements(CNE).Thro...On June 5,2025,with the theme“Co-drive Sustainable Journey,Cocreate for Shared Success”,BASF participates in the 2025 Shanghai International Carbon Neutrality Expo in Technologies,Products and Achievements(CNE).Through three sections titled“renewable energy”,“alternative raw materials”,and“new technologies”,BASF presents its latest progress towards its goal of net-zero greenhouse gas emissions by 2050,along with its innovative low-carbon technologies and co-creations with its partners.展开更多
As global atmospheric carbon dioxide concentrations continue to rise,the utilization of environmentally friendly alternative fuels becomes increasingly crucial[1].Methane,with its high hydrogen-to-carbon(H/C)ratio,emi...As global atmospheric carbon dioxide concentrations continue to rise,the utilization of environmentally friendly alternative fuels becomes increasingly crucial[1].Methane,with its high hydrogen-to-carbon(H/C)ratio,emits less CO_(2) than petroleum upon combustion,making it an efficient and clean energy source[2].Efficient methane storage is therefore a critical challenge and goal.Adsorbed natural gas(ANG)has recently been widely reported as a promising methane adsorption method,which utilizes porous materials to adsorb methane at high pressure and desorb it at relatively low pressure,offering superior working capacity performance over conventional compressed natural gas systems[3].Covalent organic frameworks(COFs),porous crystalline materials with permanent porosity and highly ordered structures constructed via strong covalent bonds,show good potential as methane adsorbents due to their permanent porosity[4].However,achieving high specific surface area and appropriate pore size in COFs for enhanced methane adsorption capacity remains a challenge.展开更多
Phar.Eur.Herbal Drug(HD)monographs state which aspects have to be considered for quality assurance through the relevant chapters'Definition'.'Characters','Identification','Tests',and...Phar.Eur.Herbal Drug(HD)monographs state which aspects have to be considered for quality assurance through the relevant chapters'Definition'.'Characters','Identification','Tests',and'Assay'.Identification of botanical material is achieved by macroscopic and microscopic morphology,generally examined by a trained expert.Content or assay is the most difficult area of展开更多
基金National Natural Science Foundation of China(52130509,52275211,52075542)Supported by 145 Project+1 种基金Science and Technology New Star Project of Shaanxi Innovation Capability Support Program(2021KJXX-38)China Postdoctoral Science Foundation(2021M693883)。
文摘High-performance yttrium oxide-phenolic resin(Y_(2)O_(3)-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y_(2)O_(3)-coated PF(Y_(2)O_(3)/PF)powder was firstly sprayed onto the substrate,forming a transition layer,and then the spherical Y_(2)O_(3) powder and Y_(2)O_(3)/PF powder were alternately deposited to form the composite alternating coating.Results show that the alternating coating is mainly composed of deposited Y_(2)O_(3)/PF powder.The bonding strength between coating and substrate is as high as 26.48 MPa with the single-test maximum bonding strength of 28.10 MPa,and shear strength reaches 24.30 MPa.Additionally,the heat transfer effect caused by external Y_(2)O_(3) particles gradually softens and even melts PF,thus effectively avoiding the damage of high temperature to molecular structure and thereby promoting the crosslinking and curing effects of resin during the deposition process.In the meantime,the unmelted Y_(2)O_(3) powder results in the shot peening effect,which washes out and eliminates the powder particles with inferior deposition effect,ultimately improving the physical and chemical properties of the alternating coating.
基金This work was supported by the Programme for National Natural Science Foundation of China(52078150,51878196)National Key R&D Program of China(2019YFE0112500)2019 Guangzhou University Full-Time Graduate“Basic Innovation”Project(2019GDJC-D11).
文摘An artificially accelerated alternation of aging and seawater erosion test of rubber materials used in lead rubber bearing(LRB)was performed,mainly to study the time-varying laws of rubber materials mechanical properties.Time-varying laws of the Mooney–Rivlin and Neo-Hookean constitutive parameters of rubber materials under the alternation of aging and seawater erosion were also analyzed.Results indicate that the rubber material mechanical properties were significantly affected by alternation of aging and seawater erosion.Hardness and elongation stress increased exponentially with test time.And 120 days after the test,the hardness increased by 14%,the maximum percentage increase in stress of 124.76%occurred at 100%constant elongation and the minimum percentage increase in stress of 68.32%occurred at 300%constant elongation;Tensile strength and elongation at break decreased by 44.96%and 53.09%.Besides,constitutive parameters of Mooney–Rivlin and Neo-Hookean all changed greatly with test duration.Finally,time-varying laws of constitutive parameters were verified by comparing the simulated and experimental results of the lead rubber bearing’s stiffness.Research results are of great significance to the seismic performance research and life-cycle performance analysis of offshore traffic engineering such as cross-sea bridges and bridges in the marine environment.
文摘High dielectric constant (high-k) materials are vital to the nanoelectronic devices. The paper reviews research development of high-k materials, describes a variety of manufacture technologies and discusses the application of the gate stack systems to non-classical device structures.
文摘On June 5,2025,with the theme“Co-drive Sustainable Journey,Cocreate for Shared Success”,BASF participates in the 2025 Shanghai International Carbon Neutrality Expo in Technologies,Products and Achievements(CNE).Through three sections titled“renewable energy”,“alternative raw materials”,and“new technologies”,BASF presents its latest progress towards its goal of net-zero greenhouse gas emissions by 2050,along with its innovative low-carbon technologies and co-creations with its partners.
基金support by the National Natural Science Foundation of China(Nos.22201247,22471237)the startup funding from Zhejiang Universitysupported by the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(No.2023R01007).
文摘As global atmospheric carbon dioxide concentrations continue to rise,the utilization of environmentally friendly alternative fuels becomes increasingly crucial[1].Methane,with its high hydrogen-to-carbon(H/C)ratio,emits less CO_(2) than petroleum upon combustion,making it an efficient and clean energy source[2].Efficient methane storage is therefore a critical challenge and goal.Adsorbed natural gas(ANG)has recently been widely reported as a promising methane adsorption method,which utilizes porous materials to adsorb methane at high pressure and desorb it at relatively low pressure,offering superior working capacity performance over conventional compressed natural gas systems[3].Covalent organic frameworks(COFs),porous crystalline materials with permanent porosity and highly ordered structures constructed via strong covalent bonds,show good potential as methane adsorbents due to their permanent porosity[4].However,achieving high specific surface area and appropriate pore size in COFs for enhanced methane adsorption capacity remains a challenge.
文摘Phar.Eur.Herbal Drug(HD)monographs state which aspects have to be considered for quality assurance through the relevant chapters'Definition'.'Characters','Identification','Tests',and'Assay'.Identification of botanical material is achieved by macroscopic and microscopic morphology,generally examined by a trained expert.Content or assay is the most difficult area of
