It is well known that the deformation and damage of reservoir colluvium landslides are often determined by the combined dynamics of reservoir water level change and rainfall.Based on the systematic analysis of the cha...It is well known that the deformation and damage of reservoir colluvium landslides are often determined by the combined dynamics of reservoir water level change and rainfall.Based on the systematic analysis of the change law of reservoir water level,rainfall and displacements of reservoir colluvium landslide,this paper proposes the compound hydrodynamic action of rainfall and reservoir water as the unload-load parameter,and the landslide displacement as the unload-load response parameter.Based on this,a physical prediction model of the compound hydrodynamic unload-load response ratio of reservoir colluvium landslide was established,and the quantitative relationship between the compound hydrodynamic unload-load response ratio and its stability evolution was in-depth analyzed and determined.On the basis of the above research,taking Shuping landslide,a typical hydrodynamic pressure landslide as an example,the unload-load response ratio model is used to systematically evaluate and predict the stability evolution law and the change trend of the landslide under compound hydrodynamic action.The prediction result shows that the variation law of the compound hydrodynamic unload-load response ratio is consistent with the dynamic evolution law of its stability.Therefore,the above studies show that the compound hydrodynamic unload-load response ratio parameter is an effective displacement dynamic evaluation parameter for reservoir colluvium landslides,so it can be used in the prediction of the reservoir colluvium landslides.展开更多
Superhydrophobic coatings are increasingly being evaluated as anticorrosion interventions in exceedingly hydrated environments.However,concerns about their long-term durability and amenability to large-area applicatio...Superhydrophobic coatings are increasingly being evaluated as anticorrosion interventions in exceedingly hydrated environments.However,concerns about their long-term durability and amenability to large-area applications in marine environments are still hindering commercial-scale deployment.This study is focused on development of easy-to-apply superhydrophobic coatings,with multifunctional capabilities,in order to extend the integrity and durability of the coatings in harsh marine environments.Here,a set of facile methods involving selective chemical etching using concentrated Na OH,as well as fluorination with perfluoropolyether methyl ester were adopted to fabricate a superhydrophobic surface on basalt scales,having the required rough hierarchical micro-nanotextured and low surface energy.The superhydrophobic basalt scales were subsequently aligned atop a fluorocarbon resin,pre-deposited on a metal substrate,to yield a multifunctional superhydrophobic coating(3μL water droplet;contact angle=165.1°,rolling angle=0.7°),easily amenable to large surface area application and having excellent wear resistance,UV-aging resistance,salt spray resistance,corrosion resistance and antibacterial capabilities.展开更多
Till now,fewer literatures have investigated the corrosion resistance of microwave absorbers,especially mental@C/carbon matrix derived from MOF composites,although it is known that carbon shells possess a protective e...Till now,fewer literatures have investigated the corrosion resistance of microwave absorbers,especially mental@C/carbon matrix derived from MOF composites,although it is known that carbon shells possess a protective effect.Herein,three kinds of morphology-controlled CoNi/C-N doped architectures were suc-cessfully fabricated via a sequence of processing,namely coprecipitation for ZIF-67,subsequent Ni^(2+) ex-change and ultimate carbonization.Apart from composition characterization,the effects of microstructure tailoring and temperature controlling on electromagnetic response as well as attenuation performance were revealed,where dodecahedron-shaped composites possessed the highest permittivity.By contrast,rod-shaped composites(CoNi/C-r-550 and CoNi/C-r-700)were endowed with superior comprehensive ab-sorption properties,e.g.,RL_(min):-49.8 dB and-64.0 dB;EAB:5.7 GHz and 4.8 GHz,respectively.Besides,samples CoNi/C-d-700 and CoNi/C-r-700 present higher corrosion potential(E_(corr))and lower corrosion current(I corr).Hence,these corrosion-resistant microwave absorbers with outstanding absorption stabil-ity,wetting effect as well as environmental adaptability,can be used as a candidate/raw material for intelligent devices.展开更多
Whereas hollow composites present some superiorities like abundant micro interfaces,outstanding impedance matching as the responses of electromagnetic wave(EMW),but versatile designs including crystal transformation,h...Whereas hollow composites present some superiorities like abundant micro interfaces,outstanding impedance matching as the responses of electromagnetic wave(EMW),but versatile designs including crystal transformation,heterogeneous structures and magnetic exchange coupling to further contribution are even not designed or stressed together in previous literatures.In this article,rational design on the hollow CoFe_(2)O_(4)/CoFe@C architecture has been conducted by a sequential process of self-sacrifice by combustion,in-suit polymerization and calcination.Results of morphology observation exhibit that heterogeneous CoFe_(2)O_(4)/CoFe@C composites were generated via crystal transformation from CoFe_(2)O_(4) to CoFe alloys with encapsulated carbon,together with ultimate growth of crystal particles.As for three carbon-based architectures,relatively low-graphitization carbon layers are favorable for enhancing impedance matching and polarization relaxation,but suppressing the conductive loss essentially.Moderate carbon content endows sample S2 with the maximum magnetic saturation(Ms)of 152.4 emu g^(-1).The optimized RL of sample S3 is up to-51 dB with 30 wt%loading,and the effective absorption band(EAB)is of 5.9 GHz at the thickness of 2.17 mm,while 6.0 GHz can be reached at 2.5 mm.Therefore,this hollow multi-interfaces design definitely shed light on novel structure for new excellent absorbers.展开更多
To realize a rapid evaluation of coating degradation under alternating hydrostatic pressure(AHP),appropriate physical models of electrochemical impedance spectroscopy(EIS)data fitting were respectively developed for e...To realize a rapid evaluation of coating degradation under alternating hydrostatic pressure(AHP),appropriate physical models of electrochemical impedance spectroscopy(EIS)data fitting were respectively developed for epoxy coatings with and without pigments,based on their different water absorption behaviours.Power-law model was selected to evaluate the anti-permeability of epoxy varnish(EV)coating,which tends to form through pores in the coating structure.On the other hand,two-layer model based on Young theory was developed to evaluate the anti-permeability of pigmented epoxy coating.Consequently,the resistivity profile with coating thickness was calculated as a critical parameter to describe the anti-permeability of coating at different immersion time.The interpretation of water diffusion dynamics based on different coating structures was also given,which is responsible for the choice of distribution models.展开更多
Crack initiation and extension occur in organic coatings during service in deep-sea environments.However,when extracting detailed crack information from SEM images of epoxy mica coatings at different time periods in a...Crack initiation and extension occur in organic coatings during service in deep-sea environments.However,when extracting detailed crack information from SEM images of epoxy mica coatings at different time periods in a simulated deep-sea fluid-hydraulic environment,uninteresting background regions are treated equally,resulting in unnecessary computational redundancy.To address the relatively blurred edges and unclear textures of SEM images,a crack image super-resolution network based on global mixed attention(GMA-net)is proposed for application to SEM images of organic coatings.The recognition results of the images processed with GMA-net were compared with those of the original images and the images processed with bicubic method,respectively.The results show that this method not only refrains from destroying the clarity of the original images but also greatly outperforms bicubic method in terms of precision,recall,mAP50 and mPA50–95,which are improved by approximately 23.1%,32.4%,36.4%and 26.7%,respectively.This method effectively highlights the details and improves the recognition accuracy of the edge texture with the aim of providing a good basis for subsequent recognition and even lifetime prediction studies.展开更多
Corrosion failure of sacrificial anodes in extreme deep-sea environment is a key problem in metal protection technology.This study investigated the failure mechanism of the Al-Zn-In sacrificial anode under the synergi...Corrosion failure of sacrificial anodes in extreme deep-sea environment is a key problem in metal protection technology.This study investigated the failure mechanism of the Al-Zn-In sacrificial anode under the synergic action of water pressure and fluid flow,by microstructure characterization and finite element analysis.The results exhibit that water pressure promotes the dissolution of Al-Zn-In alloy near the precipitates that are enriched at the grain boundaries.The flow amplifies the promoting effect of the pressure on anodic dissolution by inhibiting the formation of corrosion layers,and it accelerates the mass loss by mechanically aggressing the aluminum matrix.The synergic effect of water pressure and fluid flow results in a rapid degradation in the extreme deepsea environment.展开更多
Accelerated senescence is important because this process is involved in tumor suppression and has been induced by many chemotherapeutic agents. The platinum-based chemotherapeutic agent cisplatin displays a wide range...Accelerated senescence is important because this process is involved in tumor suppression and has been induced by many chemotherapeutic agents. The platinum-based chemotherapeutic agent cisplatin displays a wide range of antitumor activities. However, the molecular mechanism of cisplatin-induced accelerated senescence in hepatocellular carcinoma （HCC） remains unclear. In the present study, the growth inhibitory effect of cisplatin on HepG2 and SMMC-7721 cells was detected by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide assay. Cellular senescence was then assessed by I^-galactosidase assay. Senescence-related factors, including p53, p21, and p16, were evaluated by quantitative reverse transcription-polymerase chain reaction. Reactive oxygen species （ROS） was analyzed by flow cytometry. Our results revealed that cisplatin reduced the proliferation of HepG2 and SMMC-7721 cells in a dose- and time-dependent manner. Senescent phenotype observed in cisplatin- treated hepatoma cells was dependent on p53 and p21 activation but not on pl 6 activation. Furthermore, cisplatininduced accelerated senescence depended on intracellular ROS generation. The ROS scavenger N-acetyl-Lcysteine also significantly suppressed the cisplatin-induced senescence of HepG2 and SMMC-7721 cells. In conclusion, our results revealed a functional link between intracellular ROS generation and cisplatin-indnced accelerated senescence, and this link may be used as a potential target of HCC.展开更多
2-aminoterephthalic acid(DATPA)was used as a binding agent for grafting nano-Fe_(2)O_(3)onto the surface of graphene oxide(GO).Covalent bonding of this composite filler GOF was verified by SEM,XRD and FT-IR.The result...2-aminoterephthalic acid(DATPA)was used as a binding agent for grafting nano-Fe_(2)O_(3)onto the surface of graphene oxide(GO).Covalent bonding of this composite filler GOF was verified by SEM,XRD and FT-IR.The results indicated that the GOF fillers were dispersed well in the epoxy coating matrix.The compatibility between the filler and epoxy coating was enhanced,resulting in a good bonding of the filler and coating matrix.EIS results revealed that the|Z|_(0.01Hz)values of GOF/EP coating kept at 10^(7)Ωcm^(2)after 7 cycles under alternating hydrostatic pressure(AHP)condition,which is higher than that of GO/EP coating(2.38×10^(6)Ωcm^(2)).Well bonded GOF/epoxy resin interface is the reason for resisting the“push-pull”damage of AHP.展开更多
基金supported by the National Natural Science Foundation of China(No.41372297)the Natural Science Foundation of Shandong Province(No.ZR2020KE004)+1 种基金the Open Fund of Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources(No.BHKF2021Y05)the Qingdao Postdoctoral Applied Research Project and the Open Foundation of Geo-Engineering Surveying Institute of Qingdao(No.2019-QDDZYKF02).
文摘It is well known that the deformation and damage of reservoir colluvium landslides are often determined by the combined dynamics of reservoir water level change and rainfall.Based on the systematic analysis of the change law of reservoir water level,rainfall and displacements of reservoir colluvium landslide,this paper proposes the compound hydrodynamic action of rainfall and reservoir water as the unload-load parameter,and the landslide displacement as the unload-load response parameter.Based on this,a physical prediction model of the compound hydrodynamic unload-load response ratio of reservoir colluvium landslide was established,and the quantitative relationship between the compound hydrodynamic unload-load response ratio and its stability evolution was in-depth analyzed and determined.On the basis of the above research,taking Shuping landslide,a typical hydrodynamic pressure landslide as an example,the unload-load response ratio model is used to systematically evaluate and predict the stability evolution law and the change trend of the landslide under compound hydrodynamic action.The prediction result shows that the variation law of the compound hydrodynamic unload-load response ratio is consistent with the dynamic evolution law of its stability.Therefore,the above studies show that the compound hydrodynamic unload-load response ratio parameter is an effective displacement dynamic evaluation parameter for reservoir colluvium landslides,so it can be used in the prediction of the reservoir colluvium landslides.
基金the financial supports of the National Natural Science Foundation of China under the contract No.51871049the Fundamental Research Funds for the Central Universities under the contract No.2017YFB0702303+1 种基金Liao Ning Revitalization Talents Program under the contract No.XLYC1807076the World Bank funded Africa Centers of Excellence for Development Impact(ACE Impact)Project。
文摘Superhydrophobic coatings are increasingly being evaluated as anticorrosion interventions in exceedingly hydrated environments.However,concerns about their long-term durability and amenability to large-area applications in marine environments are still hindering commercial-scale deployment.This study is focused on development of easy-to-apply superhydrophobic coatings,with multifunctional capabilities,in order to extend the integrity and durability of the coatings in harsh marine environments.Here,a set of facile methods involving selective chemical etching using concentrated Na OH,as well as fluorination with perfluoropolyether methyl ester were adopted to fabricate a superhydrophobic surface on basalt scales,having the required rough hierarchical micro-nanotextured and low surface energy.The superhydrophobic basalt scales were subsequently aligned atop a fluorocarbon resin,pre-deposited on a metal substrate,to yield a multifunctional superhydrophobic coating(3μL water droplet;contact angle=165.1°,rolling angle=0.7°),easily amenable to large surface area application and having excellent wear resistance,UV-aging resistance,salt spray resistance,corrosion resistance and antibacterial capabilities.
基金supported by the National Natural Science Foundation of China (Nos. U20B2026 and 51871049)。
文摘Till now,fewer literatures have investigated the corrosion resistance of microwave absorbers,especially mental@C/carbon matrix derived from MOF composites,although it is known that carbon shells possess a protective effect.Herein,three kinds of morphology-controlled CoNi/C-N doped architectures were suc-cessfully fabricated via a sequence of processing,namely coprecipitation for ZIF-67,subsequent Ni^(2+) ex-change and ultimate carbonization.Apart from composition characterization,the effects of microstructure tailoring and temperature controlling on electromagnetic response as well as attenuation performance were revealed,where dodecahedron-shaped composites possessed the highest permittivity.By contrast,rod-shaped composites(CoNi/C-r-550 and CoNi/C-r-700)were endowed with superior comprehensive ab-sorption properties,e.g.,RL_(min):-49.8 dB and-64.0 dB;EAB:5.7 GHz and 4.8 GHz,respectively.Besides,samples CoNi/C-d-700 and CoNi/C-r-700 present higher corrosion potential(E_(corr))and lower corrosion current(I corr).Hence,these corrosion-resistant microwave absorbers with outstanding absorption stabil-ity,wetting effect as well as environmental adaptability,can be used as a candidate/raw material for intelligent devices.
基金This work was supported by the National Natural Science Foundation of China(No.51622106)the Liao Ning Revitalization Talents Program(No.XLYC1807076)。
文摘Whereas hollow composites present some superiorities like abundant micro interfaces,outstanding impedance matching as the responses of electromagnetic wave(EMW),but versatile designs including crystal transformation,heterogeneous structures and magnetic exchange coupling to further contribution are even not designed or stressed together in previous literatures.In this article,rational design on the hollow CoFe_(2)O_(4)/CoFe@C architecture has been conducted by a sequential process of self-sacrifice by combustion,in-suit polymerization and calcination.Results of morphology observation exhibit that heterogeneous CoFe_(2)O_(4)/CoFe@C composites were generated via crystal transformation from CoFe_(2)O_(4) to CoFe alloys with encapsulated carbon,together with ultimate growth of crystal particles.As for three carbon-based architectures,relatively low-graphitization carbon layers are favorable for enhancing impedance matching and polarization relaxation,but suppressing the conductive loss essentially.Moderate carbon content endows sample S2 with the maximum magnetic saturation(Ms)of 152.4 emu g^(-1).The optimized RL of sample S3 is up to-51 dB with 30 wt%loading,and the effective absorption band(EAB)is of 5.9 GHz at the thickness of 2.17 mm,while 6.0 GHz can be reached at 2.5 mm.Therefore,this hollow multi-interfaces design definitely shed light on novel structure for new excellent absorbers.
基金financially supported by the National Natural Science Foundation of China(No.51622106 and 51901040)the Fundamental Research Funds for the Central Universities(No.N170203005 and N170212021)the China Postdoctoral Science Foundation(No.2018M640256)。
文摘To realize a rapid evaluation of coating degradation under alternating hydrostatic pressure(AHP),appropriate physical models of electrochemical impedance spectroscopy(EIS)data fitting were respectively developed for epoxy coatings with and without pigments,based on their different water absorption behaviours.Power-law model was selected to evaluate the anti-permeability of epoxy varnish(EV)coating,which tends to form through pores in the coating structure.On the other hand,two-layer model based on Young theory was developed to evaluate the anti-permeability of pigmented epoxy coating.Consequently,the resistivity profile with coating thickness was calculated as a critical parameter to describe the anti-permeability of coating at different immersion time.The interpretation of water diffusion dynamics based on different coating structures was also given,which is responsible for the choice of distribution models.
基金supported by the National Natural Science Foundation of China(U20B2026 and 52271052)the Fundamental Research Funds for the Central Universities(N2402012)
文摘Crack initiation and extension occur in organic coatings during service in deep-sea environments.However,when extracting detailed crack information from SEM images of epoxy mica coatings at different time periods in a simulated deep-sea fluid-hydraulic environment,uninteresting background regions are treated equally,resulting in unnecessary computational redundancy.To address the relatively blurred edges and unclear textures of SEM images,a crack image super-resolution network based on global mixed attention(GMA-net)is proposed for application to SEM images of organic coatings.The recognition results of the images processed with GMA-net were compared with those of the original images and the images processed with bicubic method,respectively.The results show that this method not only refrains from destroying the clarity of the original images but also greatly outperforms bicubic method in terms of precision,recall,mAP50 and mPA50–95,which are improved by approximately 23.1%,32.4%,36.4%and 26.7%,respectively.This method effectively highlights the details and improves the recognition accuracy of the edge texture with the aim of providing a good basis for subsequent recognition and even lifetime prediction studies.
基金supported by the National Key R&D Program of China(2022YFB3808800)Natural Science Foundation of Liaoning Province(2023-MSBA-049)+1 种基金the Fundamental Research Funds for the Central Universities(N2202017)the National Natural Science Foundation of China(U20b2026)
文摘Corrosion failure of sacrificial anodes in extreme deep-sea environment is a key problem in metal protection technology.This study investigated the failure mechanism of the Al-Zn-In sacrificial anode under the synergic action of water pressure and fluid flow,by microstructure characterization and finite element analysis.The results exhibit that water pressure promotes the dissolution of Al-Zn-In alloy near the precipitates that are enriched at the grain boundaries.The flow amplifies the promoting effect of the pressure on anodic dissolution by inhibiting the formation of corrosion layers,and it accelerates the mass loss by mechanically aggressing the aluminum matrix.The synergic effect of water pressure and fluid flow results in a rapid degradation in the extreme deepsea environment.
文摘Accelerated senescence is important because this process is involved in tumor suppression and has been induced by many chemotherapeutic agents. The platinum-based chemotherapeutic agent cisplatin displays a wide range of antitumor activities. However, the molecular mechanism of cisplatin-induced accelerated senescence in hepatocellular carcinoma （HCC） remains unclear. In the present study, the growth inhibitory effect of cisplatin on HepG2 and SMMC-7721 cells was detected by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide assay. Cellular senescence was then assessed by I^-galactosidase assay. Senescence-related factors, including p53, p21, and p16, were evaluated by quantitative reverse transcription-polymerase chain reaction. Reactive oxygen species （ROS） was analyzed by flow cytometry. Our results revealed that cisplatin reduced the proliferation of HepG2 and SMMC-7721 cells in a dose- and time-dependent manner. Senescent phenotype observed in cisplatin- treated hepatoma cells was dependent on p53 and p21 activation but not on pl 6 activation. Furthermore, cisplatininduced accelerated senescence depended on intracellular ROS generation. The ROS scavenger N-acetyl-Lcysteine also significantly suppressed the cisplatin-induced senescence of HepG2 and SMMC-7721 cells. In conclusion, our results revealed a functional link between intracellular ROS generation and cisplatin-indnced accelerated senescence, and this link may be used as a potential target of HCC.
基金financially supported by the National Natural Science Foundation of China(Nos.U20A20233 and 51901040)the Fundamental Research Funds for the Central Universities(No.N2102014)
文摘2-aminoterephthalic acid(DATPA)was used as a binding agent for grafting nano-Fe_(2)O_(3)onto the surface of graphene oxide(GO).Covalent bonding of this composite filler GOF was verified by SEM,XRD and FT-IR.The results indicated that the GOF fillers were dispersed well in the epoxy coating matrix.The compatibility between the filler and epoxy coating was enhanced,resulting in a good bonding of the filler and coating matrix.EIS results revealed that the|Z|_(0.01Hz)values of GOF/EP coating kept at 10^(7)Ωcm^(2)after 7 cycles under alternating hydrostatic pressure(AHP)condition,which is higher than that of GO/EP coating(2.38×10^(6)Ωcm^(2)).Well bonded GOF/epoxy resin interface is the reason for resisting the“push-pull”damage of AHP.
