近年来,随着中国人口老龄化的加剧,老年髋部骨折发病率及患病率均呈现上升趋势。髋部骨折严重影响老年人群的健康,给患者家庭和社会带来了沉重的负担。为了进一步优化老年髋部骨折防治体系,由东南大学附属中大医院牵头、依托中国康复医...近年来,随着中国人口老龄化的加剧,老年髋部骨折发病率及患病率均呈现上升趋势。髋部骨折严重影响老年人群的健康,给患者家庭和社会带来了沉重的负担。为了进一步优化老年髋部骨折防治体系,由东南大学附属中大医院牵头、依托中国康复医学会修复重建外科专业委员会老年髋部骨折学组,组织同济大学附属杨浦医院骨科等多家权威机构的专家学者,共同编撰《中国老年髋部骨折报告2025》。本报告依据全球疾病负担数据(Global Burden of Disease,GBD)呈现了中国老年髋部骨折的流行病学数据,其中,2023年全国各省市、自治区和特别行政区老年髋部骨折新发病例数为3640182例(95%UI=2619938~5003555),约占全球总数的19.24%;患病人数约7487945例(95%UI=6596811~8586005),约占全球总数的17.13%。此外,本文深入分析了老年髋部骨折的潜在危险因素,提出了“脆性骨折三角”的概念,并总结了老年髋部骨折围术期诊疗的研究进展。本报告将为老年髋部骨折的围术期诊疗提供科学的技术指导和有力的数据支持,为政府和相关部门制定针对性的卫生政策和干预措施提供专业依据,同时也为促进国内、外在该领域的学术交流与合作搭建了平台。期待这份老年髋部骨折报告不仅为专业人员提供参考和借鉴,也能够进一步提高公众对老年髋部骨折的认识。展开更多
Compared to the well-studied two-dimensional(2D)ferroelectricity,the appearance of 2D antiferroelectricity is much rarer,where local dipoles from the nonequivalent sublattices within 2D monolayers are oppositely orien...Compared to the well-studied two-dimensional(2D)ferroelectricity,the appearance of 2D antiferroelectricity is much rarer,where local dipoles from the nonequivalent sublattices within 2D monolayers are oppositely oriented.Using NbOCl_(2) monolayer with competing ferroelectric(FE)and antiferroelectric(AFE)phases as a 2D material platform,we demonstrate the emergence of intrinsic antiferroelectricity in NbOCl_(2) monolayer under experimentally accessible shear strain,along with new functionality associated with electric field-induced AFE-to-FE phase transition.Specifically,the complex configuration space accommodating FE and AFE phases,polarization switching kinetics,and finite temperature thermodynamic properties of 2D NbOCl_(2) are all accurately predicted by large-scale molecular dynamics simulations based on deep learning interatomic potential model.Moreover,room temperature stable antiferroelectricity with low polarization switching barrier and one-dimensional collinear polarization arrangement is predicted in shear-deformed NbOCl_(2) monolayer.The transition from AFE to FE phase in 2D NbOCl_(2) can be triggered by a low critical electric field,leading to a double polarization–electric(P–E)loop with small hysteresis.A new type of optoelectronic device composed of AFE-NbOCl_(2) is proposed,enabling electric“writing”and nonlinear optical“reading”logical operation with fast operation speed and low power consumption.展开更多
Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Couple...Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Coupled Controlled Split Hopkinson Pressure Bar(MCC-SHPB)system to elucidate the cross-scale dynamic responses of rocks and the boundaries of failure modes under THM coupling.Impact tests were conducted on green sandstone under coupled conditions of temperature(25℃-80℃),confining pressure(0-15 MPa),and seepage water pressure(0-15 MPa).Scanning electron microscopy(SEM)microstructural characterization and COMSOL Multiphysics numerical simulations were conducted,and a dynamic constitutive theoretical framework and failure-prediction methodology were established.We investigated the impact toughness index(I_(t)),dynamic modulus(E_(d)),dynamic triaxial compressive strength(TCS_(d)),fragmentation degree(W),and failure modes of green sandstone under thermo-confining pressure-seepage-impact loading conditions.The key findings reveal that the(I_(t))reflects different energy regulation mechanisms across different confining pressure regimes.Thermal-microcrack interactions dominate at low pressure,and energy absorption prevails at high pressure.A triphasic dynamic modulus model captures stiffness evolution under energy-driven conditions,revealing cross-scale crack nucleation-propagation and fragment reorganization.The TCSd inflection point signifies energy dissipation shifts,causing nonlinear skeleton bearing-capacity degradation.A critical criterion based on the W was established to distinguish between the two failure modes and predict the unstable failure initiation.Numerical simulations were used to elucidate the effects of inertia-dominated crack propagation and stress wave interference,validating the critical criterion and the predictive accuracy of the theoretical model during cross-scale failure.This study provides a theoretical foundation for assessing the dynamic stability of rock masses subjected to multi-field coupling during deep resource exploitation.展开更多
文摘近年来,随着中国人口老龄化的加剧,老年髋部骨折发病率及患病率均呈现上升趋势。髋部骨折严重影响老年人群的健康,给患者家庭和社会带来了沉重的负担。为了进一步优化老年髋部骨折防治体系,由东南大学附属中大医院牵头、依托中国康复医学会修复重建外科专业委员会老年髋部骨折学组,组织同济大学附属杨浦医院骨科等多家权威机构的专家学者,共同编撰《中国老年髋部骨折报告2025》。本报告依据全球疾病负担数据(Global Burden of Disease,GBD)呈现了中国老年髋部骨折的流行病学数据,其中,2023年全国各省市、自治区和特别行政区老年髋部骨折新发病例数为3640182例(95%UI=2619938~5003555),约占全球总数的19.24%;患病人数约7487945例(95%UI=6596811~8586005),约占全球总数的17.13%。此外,本文深入分析了老年髋部骨折的潜在危险因素,提出了“脆性骨折三角”的概念,并总结了老年髋部骨折围术期诊疗的研究进展。本报告将为老年髋部骨折的围术期诊疗提供科学的技术指导和有力的数据支持,为政府和相关部门制定针对性的卫生政策和干预措施提供专业依据,同时也为促进国内、外在该领域的学术交流与合作搭建了平台。期待这份老年髋部骨折报告不仅为专业人员提供参考和借鉴,也能够进一步提高公众对老年髋部骨折的认识。
基金supported by the National Natural Science Foundation of China (Grant No.11574244 for G.Y.G.)the XJTU Research Fund for AI Science (Grant No.2025YXYC011 for G.Y.G.)the Hong Kong Global STEM Professorship Scheme (for X.C.Z.)。
文摘Compared to the well-studied two-dimensional(2D)ferroelectricity,the appearance of 2D antiferroelectricity is much rarer,where local dipoles from the nonequivalent sublattices within 2D monolayers are oppositely oriented.Using NbOCl_(2) monolayer with competing ferroelectric(FE)and antiferroelectric(AFE)phases as a 2D material platform,we demonstrate the emergence of intrinsic antiferroelectricity in NbOCl_(2) monolayer under experimentally accessible shear strain,along with new functionality associated with electric field-induced AFE-to-FE phase transition.Specifically,the complex configuration space accommodating FE and AFE phases,polarization switching kinetics,and finite temperature thermodynamic properties of 2D NbOCl_(2) are all accurately predicted by large-scale molecular dynamics simulations based on deep learning interatomic potential model.Moreover,room temperature stable antiferroelectricity with low polarization switching barrier and one-dimensional collinear polarization arrangement is predicted in shear-deformed NbOCl_(2) monolayer.The transition from AFE to FE phase in 2D NbOCl_(2) can be triggered by a low critical electric field,leading to a double polarization–electric(P–E)loop with small hysteresis.A new type of optoelectronic device composed of AFE-NbOCl_(2) is proposed,enabling electric“writing”and nonlinear optical“reading”logical operation with fast operation speed and low power consumption.
基金supported by the National Natural Science Foundation of China(Grant Nos.12272411 and 42007259).
文摘Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Coupled Controlled Split Hopkinson Pressure Bar(MCC-SHPB)system to elucidate the cross-scale dynamic responses of rocks and the boundaries of failure modes under THM coupling.Impact tests were conducted on green sandstone under coupled conditions of temperature(25℃-80℃),confining pressure(0-15 MPa),and seepage water pressure(0-15 MPa).Scanning electron microscopy(SEM)microstructural characterization and COMSOL Multiphysics numerical simulations were conducted,and a dynamic constitutive theoretical framework and failure-prediction methodology were established.We investigated the impact toughness index(I_(t)),dynamic modulus(E_(d)),dynamic triaxial compressive strength(TCS_(d)),fragmentation degree(W),and failure modes of green sandstone under thermo-confining pressure-seepage-impact loading conditions.The key findings reveal that the(I_(t))reflects different energy regulation mechanisms across different confining pressure regimes.Thermal-microcrack interactions dominate at low pressure,and energy absorption prevails at high pressure.A triphasic dynamic modulus model captures stiffness evolution under energy-driven conditions,revealing cross-scale crack nucleation-propagation and fragment reorganization.The TCSd inflection point signifies energy dissipation shifts,causing nonlinear skeleton bearing-capacity degradation.A critical criterion based on the W was established to distinguish between the two failure modes and predict the unstable failure initiation.Numerical simulations were used to elucidate the effects of inertia-dominated crack propagation and stress wave interference,validating the critical criterion and the predictive accuracy of the theoretical model during cross-scale failure.This study provides a theoretical foundation for assessing the dynamic stability of rock masses subjected to multi-field coupling during deep resource exploitation.
