As an important material carrier of ancient Chinese printing technology,woodblock printing cultural relics possess exceptionally high historical and cultural value.Jiangsu,as a major center of woodblock printing,prese...As an important material carrier of ancient Chinese printing technology,woodblock printing cultural relics possess exceptionally high historical and cultural value.Jiangsu,as a major center of woodblock printing,preserves a large number of precious relics.However,due to material properties and environmental influences,these relics are widely threatened by deterioration such as cracking,mold infestation,and corrosion,making systematic research urgently needed.Supported by a Jiangsu Provincial science and technology project,this study adopts an interdisciplinary approach to conduct a systematic investigation of the deterioration characteristics of woodblock printing cultural relics in Jiangsu and establishes a standardized database to fill a gap in this field.Field investigation,laboratory analysis,and information technology were integrated to conduct a comprehensive survey of 486 woodblock printing relics in Jiangsu.Techniques such as scanning electron microscopy and infrared spectroscopy were employed to analyze deterioration mechanisms,nanocellulose-based restoration materials were developed,and an integrated database was established.The results indicate that deterioration is primarily biologically driven,with mold infestation and insect damage being the most prominent.The incidence of deterioration is significantly higher in southern Jiangsu than in northern Jiangsu,closely associated with the local hot and humid environment.Laboratory analysis reveals that deterioration results from the combined action of microbial,chemical,and physical factors.The developed nanocellulose materials exhibit excellent performance.The database contains more than 1,000 records and supports multidimensional retrieval and risk assessment.This study innovatively proposes a multifactor synergistic model,develops specialized restoration materials,and establishes the first dedicated database on woodblock deterioration in Jiangsu,providing a scientific framework for regional cultural heritage conservation.Future research may expand toward intelligent early warning systems and interdisciplinary integration to promote the sustainable preservation of cultural heritage.展开更多
To reveal the deterioration mechanism of coal-rock assemblages under chemical corrosion and dynamic loading,chemical corrosion and dynamic impact experiments were conducted.Under different chemical corrosion condition...To reveal the deterioration mechanism of coal-rock assemblages under chemical corrosion and dynamic loading,chemical corrosion and dynamic impact experiments were conducted.Under different chemical corrosion conditions,the weakening characteristics,observable characteristics,softening characteristics of the dynamic parameters,dynamic failure characteristics,dynamic failure forms and dynamic microscopic characteristics were analyzed.Under each corrosion condition,the dynamic elastic modulus,dynamic deformation modulus and dynamic peak intensity tended to decrease with immersing time.The dynamic elastic modulus,dynamic deformation modulus and dynamic peak intensity exhibited an inverted U-shaped trend.Under dynamic impact,the failure process of acidly corroded samples can be divided into the following stages:the initial stage,elastic energy accumulation stage,local failure of coal and secondary rock crack expansion stage,coal fragment ejection stage,rock spalling stage and complete instability stage.Under dynamic impact,failure modes exist:coal crushing failure,rock fragmenting failure,rock splitting failure and full splitting failure.After impact failure,sample fragments are distributed in powder,granular,cone and block forms.Based on Zhu-Wang-Tang nonlinear viscoelastic properties,a model considering chemical corrosion and impact damage was proposed.The combined effects of chemical and impact-induced damage on the dynamic mechanical properties of coal-rock assemblages were systematically analyzed.展开更多
As one of the major high-speed railway ballastless track structures in China,CRTSIII slab ballastless track has been laid for more than 6500 km.However,there are no detailed studies on its track irregularity deteriora...As one of the major high-speed railway ballastless track structures in China,CRTSIII slab ballastless track has been laid for more than 6500 km.However,there are no detailed studies on its track irregularity deterioration throughout extended service periods,which may threaten the safety and stability of high-speed vehicles(HSV).In this study,a long-term tracking detection of CRTSIII slab ballastless track irregularities has been conducted,revealing its annual evolution law.An HSV-track coupled dynamics model was established to investigate the HSV dynamic responses under annual evolution of track irregularities.Considering the potential deterioration of track irregularities to extremely bad condition,the recommended classified limits for irregularity are proposed by analyzing the limit-exceeding probability of the safety and stability indexes of HSV.The results show that:taking 10 m wavelength as a demarcation,longer-wavelength irregularities exhibit larger amplitudes,faster evolution rates and a linear increasing trend,primarily affecting the stability of HSV.Conversely,shorter-wavelength irregularities exhibit smaller amplitudes and an insignificant evolution trend,predominantly affecting the safety of HSV.Furthermore,the periodic irregularity induced by the arching of 32 m simply-supported beam bridge should be paid closer attention to,as their evolution rate significantly surpasses that of irregularities at other wavelengths.展开更多
文摘As an important material carrier of ancient Chinese printing technology,woodblock printing cultural relics possess exceptionally high historical and cultural value.Jiangsu,as a major center of woodblock printing,preserves a large number of precious relics.However,due to material properties and environmental influences,these relics are widely threatened by deterioration such as cracking,mold infestation,and corrosion,making systematic research urgently needed.Supported by a Jiangsu Provincial science and technology project,this study adopts an interdisciplinary approach to conduct a systematic investigation of the deterioration characteristics of woodblock printing cultural relics in Jiangsu and establishes a standardized database to fill a gap in this field.Field investigation,laboratory analysis,and information technology were integrated to conduct a comprehensive survey of 486 woodblock printing relics in Jiangsu.Techniques such as scanning electron microscopy and infrared spectroscopy were employed to analyze deterioration mechanisms,nanocellulose-based restoration materials were developed,and an integrated database was established.The results indicate that deterioration is primarily biologically driven,with mold infestation and insect damage being the most prominent.The incidence of deterioration is significantly higher in southern Jiangsu than in northern Jiangsu,closely associated with the local hot and humid environment.Laboratory analysis reveals that deterioration results from the combined action of microbial,chemical,and physical factors.The developed nanocellulose materials exhibit excellent performance.The database contains more than 1,000 records and supports multidimensional retrieval and risk assessment.This study innovatively proposes a multifactor synergistic model,develops specialized restoration materials,and establishes the first dedicated database on woodblock deterioration in Jiangsu,providing a scientific framework for regional cultural heritage conservation.Future research may expand toward intelligent early warning systems and interdisciplinary integration to promote the sustainable preservation of cultural heritage.
基金supported by the National Natural Science Foundation of China(Nos.52034009 and 52174093)the Fundamental Research Funds for the Central Universities(Nos.2024ZKPYNY01,2023ZKPYNY03,and 2023YQTD02).
文摘To reveal the deterioration mechanism of coal-rock assemblages under chemical corrosion and dynamic loading,chemical corrosion and dynamic impact experiments were conducted.Under different chemical corrosion conditions,the weakening characteristics,observable characteristics,softening characteristics of the dynamic parameters,dynamic failure characteristics,dynamic failure forms and dynamic microscopic characteristics were analyzed.Under each corrosion condition,the dynamic elastic modulus,dynamic deformation modulus and dynamic peak intensity tended to decrease with immersing time.The dynamic elastic modulus,dynamic deformation modulus and dynamic peak intensity exhibited an inverted U-shaped trend.Under dynamic impact,the failure process of acidly corroded samples can be divided into the following stages:the initial stage,elastic energy accumulation stage,local failure of coal and secondary rock crack expansion stage,coal fragment ejection stage,rock spalling stage and complete instability stage.Under dynamic impact,failure modes exist:coal crushing failure,rock fragmenting failure,rock splitting failure and full splitting failure.After impact failure,sample fragments are distributed in powder,granular,cone and block forms.Based on Zhu-Wang-Tang nonlinear viscoelastic properties,a model considering chemical corrosion and impact damage was proposed.The combined effects of chemical and impact-induced damage on the dynamic mechanical properties of coal-rock assemblages were systematically analyzed.
基金Project(2022YFB2602900)supported by the National Key Research and Development Program of ChinaProject(K2022T002)supported by the Scientific Research Plan of China Railway。
文摘As one of the major high-speed railway ballastless track structures in China,CRTSIII slab ballastless track has been laid for more than 6500 km.However,there are no detailed studies on its track irregularity deterioration throughout extended service periods,which may threaten the safety and stability of high-speed vehicles(HSV).In this study,a long-term tracking detection of CRTSIII slab ballastless track irregularities has been conducted,revealing its annual evolution law.An HSV-track coupled dynamics model was established to investigate the HSV dynamic responses under annual evolution of track irregularities.Considering the potential deterioration of track irregularities to extremely bad condition,the recommended classified limits for irregularity are proposed by analyzing the limit-exceeding probability of the safety and stability indexes of HSV.The results show that:taking 10 m wavelength as a demarcation,longer-wavelength irregularities exhibit larger amplitudes,faster evolution rates and a linear increasing trend,primarily affecting the stability of HSV.Conversely,shorter-wavelength irregularities exhibit smaller amplitudes and an insignificant evolution trend,predominantly affecting the safety of HSV.Furthermore,the periodic irregularity induced by the arching of 32 m simply-supported beam bridge should be paid closer attention to,as their evolution rate significantly surpasses that of irregularities at other wavelengths.
