Reinforced concrete(RC)structures are common in engineering,and usually exposed to air or water,may be subjected to various blast scenarios.This paper aims to investigate the blast resistance of an airbacked RC slab a...Reinforced concrete(RC)structures are common in engineering,and usually exposed to air or water,may be subjected to various blast scenarios.This paper aims to investigate the blast resistance of an airbacked RC slab against underwater contact explosions(UWCEs).A detailed numerical model based on CLE method considering explosive,water,air,and RC slab is developed to examine the structural behavior of the air-backed RC slab due to UWCEs.At first,the reliability of the numerical method is validated by comparing the numerical results of an UWCE test with experimental data.Then,the difference in dynamic behavior of air-backed and water-backed RC slabs due to UWCEs is explored with the calibrated model.The results indicate that the blast response of the air-backed slab induced by UWCE is fiercer than that of water-backed slab with equal charge mass.In addition,parametric studies are also conducted to explore the effects of the charge mass,standoff distance,reinforcement spacing,concrete compression strength,and boundary condition on the blast performance of the air-backed RC slab.展开更多
Hydroquinone(HQ)poses immeasurable risk to human health and the natural environment on the grounds of high toxicity of organic phenolic compounds.Herein,an innovative electrochemical sensor based on two-dimensional ni...Hydroquinone(HQ)poses immeasurable risk to human health and the natural environment on the grounds of high toxicity of organic phenolic compounds.Herein,an innovative electrochemical sensor based on two-dimensional nickel molybdate nanowires(NiMoO_(4)NWs)is constructed for the ultra-sensitive determination of HQ,which can provide useful reference for the human health and environment protection.Two-dimensional NiMoO_(4)NWs are prepared successfully through a facile hydrothermal reaction and annealing process.The obtained two-dimensional NiMoO_(4)NWs are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution TEM(HRTEM),energy-dispersive X-ray spectroscopy(EDS)mapping and X-ray photoelectron spectroscopy(XPS).The accurate contents of Ni and Mo have been characterized by inductively coupled plasma atomic emission spectroscopy(ICP-AES),confirming that the lower content of the nickel in NiMoO_(4)NWs possesses the higher catalytic activity of HQ.Under the optimized conditions,the constructed HQ sensor exhibits satisfactory electrocatalytic activity with a low detection limit of 0.0355μmol/L(S/N=3),a wide linear range of 0.05-4600μmol/L and sensitivity of 170.064μA/(mmol cm^(2)).The sensor has been successfully applied to the detection of HQ in rainwater,tap water,domestic sewage and drinking water samples with satisfactory recovery.At the same time,this sensor has excellent reproducibility,selectivity,and stability.The constructed sensor has potential practical application value and broad application prospect in human health and environmental monitoring.展开更多
基金The supports from the Natural Science Research of Jiangsu Higher Education Institutions of China(21KJB580001)the National Natural Science Foundation of China(Grant No.52209162,51979152)+2 种基金Educational Commission of Hubei Province of China(T2020005)Young Top-notch Talent Cultivation Program of Hubei ProvinceJiangxi Provincial Natural Science Foundation(20212BAB214044)。
文摘Reinforced concrete(RC)structures are common in engineering,and usually exposed to air or water,may be subjected to various blast scenarios.This paper aims to investigate the blast resistance of an airbacked RC slab against underwater contact explosions(UWCEs).A detailed numerical model based on CLE method considering explosive,water,air,and RC slab is developed to examine the structural behavior of the air-backed RC slab due to UWCEs.At first,the reliability of the numerical method is validated by comparing the numerical results of an UWCE test with experimental data.Then,the difference in dynamic behavior of air-backed and water-backed RC slabs due to UWCEs is explored with the calibrated model.The results indicate that the blast response of the air-backed slab induced by UWCE is fiercer than that of water-backed slab with equal charge mass.In addition,parametric studies are also conducted to explore the effects of the charge mass,standoff distance,reinforcement spacing,concrete compression strength,and boundary condition on the blast performance of the air-backed RC slab.
基金supported by the National Natural Science Foundation of China (21705103)the Applied Basic Research Project of Shanxi Province (202103021224251)+2 种基金Scientific and Technological Innovation Projects in Shanxi Universities (2019L0460)the Graduate Education Innovation Project of Shanxi Province (2021Y485)the 1331 Engineering of Shanxi Province
文摘Hydroquinone(HQ)poses immeasurable risk to human health and the natural environment on the grounds of high toxicity of organic phenolic compounds.Herein,an innovative electrochemical sensor based on two-dimensional nickel molybdate nanowires(NiMoO_(4)NWs)is constructed for the ultra-sensitive determination of HQ,which can provide useful reference for the human health and environment protection.Two-dimensional NiMoO_(4)NWs are prepared successfully through a facile hydrothermal reaction and annealing process.The obtained two-dimensional NiMoO_(4)NWs are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution TEM(HRTEM),energy-dispersive X-ray spectroscopy(EDS)mapping and X-ray photoelectron spectroscopy(XPS).The accurate contents of Ni and Mo have been characterized by inductively coupled plasma atomic emission spectroscopy(ICP-AES),confirming that the lower content of the nickel in NiMoO_(4)NWs possesses the higher catalytic activity of HQ.Under the optimized conditions,the constructed HQ sensor exhibits satisfactory electrocatalytic activity with a low detection limit of 0.0355μmol/L(S/N=3),a wide linear range of 0.05-4600μmol/L and sensitivity of 170.064μA/(mmol cm^(2)).The sensor has been successfully applied to the detection of HQ in rainwater,tap water,domestic sewage and drinking water samples with satisfactory recovery.At the same time,this sensor has excellent reproducibility,selectivity,and stability.The constructed sensor has potential practical application value and broad application prospect in human health and environmental monitoring.