Specialized households serve as the primary units within specialized villages in China,and their capacity to withstand risks and external influences significantly shapes the future trajectory of specialized villages a...Specialized households serve as the primary units within specialized villages in China,and their capacity to withstand risks and external influences significantly shapes the future trajectory of specialized villages and the overall vitality of the rural economy.In this study,we established a measurement indicator system based on the definition of specialized households’resilience,elucidating the logical connection between specialized households’resilience and rural industrial development in China.The musical instrument industry in Lankao County,Henan Province of China,was employed as a case;survey data,the entropy method,and an obstacle diagnosis model were used to examine how instrument production specialized households responded to the challenges posed by Corona Virus Disease 2019(COVID-19)and the tightening of national environmental protection policies,yielding the following key findings:1)there exists substantial variation in the comprehensive resilience levels among different specialized households;2)the ability to learn and adapt is the most significant contributor to the overall resilience level of specialized households;3)technological proficiency and access to skilled talent emerge as pivotal factors influencing specialized households’resilience;4)the positioning of specialized households within the industrial supply chain and the stability of their income have a direct bearing on their resilience level.The influence of specialized households’resilience on industrial development primarily manifests in the following ways:stronger resilience correlates with increased stability in production and sales,fostering a more proactive approach to future actions.However,heightened exposure to the external macroeconomic environment can lead to a higher rate of export reduction.To enhance the development resilience of entities like specialized households and family farms,and to invigorate rural economic development,escalating investments in rural science and technology and prioritizing the training of technical talent become imperative.展开更多
Heterostructured metals and alloys are a new class of materials in which mechanical behaviors between the heterogeneous regions are significantly different,and the mechanical properties of bulk materials are superior ...Heterostructured metals and alloys are a new class of materials in which mechanical behaviors between the heterogeneous regions are significantly different,and the mechanical properties of bulk materials are superior to the superposition of individual regions.In this paper,three distinct types of heterostructures were constructed in Mg-2.77Y(wt.%)alloy by applying simple thermomechanical processing.Namely,Type I:the non-recrystallized grains of several tens of microns were embedded in the micron-scaled recrystallized grains that were distributed along shear bands and dispersed near grain boundaries;Type II:the aggregations of micron-scaled recrystallized grains were surrounded by the non-recrystallized grains;Type II:the micron-scaled recrystallized grains dominated the microstructure,and the non-recrystallized regions with diameters of tens of micrometers were surrounded by those fine recrystallized grains.Mechanical tests showed that the material with type III heterostructure had the optimal combination of yield strength and uniform elongation.This is attributed to its remarkable hetero-deformation induced(HDI)strengthening and dislocation strengthening.At the initial stage of plastic deformation(engineering strain below 4%),the rapid accumulation of geometrically necessary dislocations(GNDs)at the interfaces between recrystallized and non-recrystallized regions and between neighboring recrystallized grains lead to the significant HDI strengthening.As deformation proceeded,the HDI strengthening effect gradually decreased,and the traditional dislocation strengthening that was caused by GNDs accumulation at grain boundaries became significant.In-situ electron back-scattered diffraction(EBSD)testing revealed that the non-basal slip in the non-recrystallized regions became more remarkable in the late stage of deformation,which improved ductility and strain hardening of the alloy.These findings provide new insight into the design of high-performance hexagonal close-packed structural materials by using the concept of HDI strengthening.展开更多
目的 探讨血清微RNA(microRNA,miRNA)液体活检在早期卵巢癌诊断中的临床价值。方法 选取2021—2023年湖州市妇幼保健院的22个新鲜冷冻Ⅰ期卵巢癌组织和9个相邻正常卵巢组织用于本研究。使用R软件中的limma软件包分析肿瘤和邻近正常组织...目的 探讨血清微RNA(microRNA,miRNA)液体活检在早期卵巢癌诊断中的临床价值。方法 选取2021—2023年湖州市妇幼保健院的22个新鲜冷冻Ⅰ期卵巢癌组织和9个相邻正常卵巢组织用于本研究。使用R软件中的limma软件包分析肿瘤和邻近正常组织之间miRNA的差异表达。利用公开的回顾性血清miRNA测序数据集GSE106817使用Ⅰ期卵巢癌中高表达的miRNA训练Logistic回归模型,使用GSE113486和GSE31568验证模型的准确性。结果 Ⅰ期卵巢癌组织中共筛选出8种高表达miRNA,即miR-182、miR-183、miR-202、miR-205、miR-508、miR-509-3、miR-513B和miR-513C。在训练队列GSE106817中用于诊断卵巢癌的曲线下面积(area under the curve,AUC)为0.89。在验证队列GSE31568和GSE113486中诊断卵巢癌的AUC分别为0.85和0.86。结论 血清miRNA液体活检对早期卵巢癌的诊断有较高的临床价值。展开更多
目的观察产时超声联合Kielland’s产钳在第二产程中的应用效果。方法选取2020年8月至2022年8月在湖州市妇幼保健院进行足月分娩的产妇350例进行回顾性分析,根据应用超声辅助Kielland’s产钳助产情况,分为观察组(n=242)和对照组(n=108)...目的观察产时超声联合Kielland’s产钳在第二产程中的应用效果。方法选取2020年8月至2022年8月在湖州市妇幼保健院进行足月分娩的产妇350例进行回顾性分析,根据应用超声辅助Kielland’s产钳助产情况,分为观察组(n=242)和对照组(n=108)。观察组在第二产程中应用超声辅助Kielland’s产钳进行助产分娩,对照组进行二程剖宫产。比较两组产妇和新生儿的并发症情况,包括产妇产后出血、绒毛膜羊膜炎、产后尿潴留、产后发热等,以及新生儿窒息和新生儿重症监护病房(neonatal intensive care unit,NICU)入住情况。结果观察组的产后出血、绒毛膜羊膜炎及住院天数均低于对照组,产后尿潴留发生率高于对照组,差异均有统计学意义(P<0.05);两组的新生儿NICU入住率及窒息率比较,差异均无统计学意义(P>0.05)。结论产时超声联合辅助Kielland’s产钳分娩,不仅不增加产妇或新生儿不良妊娠结局的发生,反而可以实现阴道助产,改善分娩结局,降低剖宫产率。展开更多
基金Under the auspices of the China Social Science(No.21BJY218)National Natural Science Foundation of China(No.41801113)Newcomer funding from Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences(No.E0V00100)。
文摘Specialized households serve as the primary units within specialized villages in China,and their capacity to withstand risks and external influences significantly shapes the future trajectory of specialized villages and the overall vitality of the rural economy.In this study,we established a measurement indicator system based on the definition of specialized households’resilience,elucidating the logical connection between specialized households’resilience and rural industrial development in China.The musical instrument industry in Lankao County,Henan Province of China,was employed as a case;survey data,the entropy method,and an obstacle diagnosis model were used to examine how instrument production specialized households responded to the challenges posed by Corona Virus Disease 2019(COVID-19)and the tightening of national environmental protection policies,yielding the following key findings:1)there exists substantial variation in the comprehensive resilience levels among different specialized households;2)the ability to learn and adapt is the most significant contributor to the overall resilience level of specialized households;3)technological proficiency and access to skilled talent emerge as pivotal factors influencing specialized households’resilience;4)the positioning of specialized households within the industrial supply chain and the stability of their income have a direct bearing on their resilience level.The influence of specialized households’resilience on industrial development primarily manifests in the following ways:stronger resilience correlates with increased stability in production and sales,fostering a more proactive approach to future actions.However,heightened exposure to the external macroeconomic environment can lead to a higher rate of export reduction.To enhance the development resilience of entities like specialized households and family farms,and to invigorate rural economic development,escalating investments in rural science and technology and prioritizing the training of technical talent become imperative.
基金funding from the National Natural Science Foundation of China(No.51922026)the Fundamental Research Funds for the Central Universities(Nos.N2002005,N2007011)the 111 Project(No.B20029).
文摘Heterostructured metals and alloys are a new class of materials in which mechanical behaviors between the heterogeneous regions are significantly different,and the mechanical properties of bulk materials are superior to the superposition of individual regions.In this paper,three distinct types of heterostructures were constructed in Mg-2.77Y(wt.%)alloy by applying simple thermomechanical processing.Namely,Type I:the non-recrystallized grains of several tens of microns were embedded in the micron-scaled recrystallized grains that were distributed along shear bands and dispersed near grain boundaries;Type II:the aggregations of micron-scaled recrystallized grains were surrounded by the non-recrystallized grains;Type II:the micron-scaled recrystallized grains dominated the microstructure,and the non-recrystallized regions with diameters of tens of micrometers were surrounded by those fine recrystallized grains.Mechanical tests showed that the material with type III heterostructure had the optimal combination of yield strength and uniform elongation.This is attributed to its remarkable hetero-deformation induced(HDI)strengthening and dislocation strengthening.At the initial stage of plastic deformation(engineering strain below 4%),the rapid accumulation of geometrically necessary dislocations(GNDs)at the interfaces between recrystallized and non-recrystallized regions and between neighboring recrystallized grains lead to the significant HDI strengthening.As deformation proceeded,the HDI strengthening effect gradually decreased,and the traditional dislocation strengthening that was caused by GNDs accumulation at grain boundaries became significant.In-situ electron back-scattered diffraction(EBSD)testing revealed that the non-basal slip in the non-recrystallized regions became more remarkable in the late stage of deformation,which improved ductility and strain hardening of the alloy.These findings provide new insight into the design of high-performance hexagonal close-packed structural materials by using the concept of HDI strengthening.
文摘目的 探讨血清微RNA(microRNA,miRNA)液体活检在早期卵巢癌诊断中的临床价值。方法 选取2021—2023年湖州市妇幼保健院的22个新鲜冷冻Ⅰ期卵巢癌组织和9个相邻正常卵巢组织用于本研究。使用R软件中的limma软件包分析肿瘤和邻近正常组织之间miRNA的差异表达。利用公开的回顾性血清miRNA测序数据集GSE106817使用Ⅰ期卵巢癌中高表达的miRNA训练Logistic回归模型,使用GSE113486和GSE31568验证模型的准确性。结果 Ⅰ期卵巢癌组织中共筛选出8种高表达miRNA,即miR-182、miR-183、miR-202、miR-205、miR-508、miR-509-3、miR-513B和miR-513C。在训练队列GSE106817中用于诊断卵巢癌的曲线下面积(area under the curve,AUC)为0.89。在验证队列GSE31568和GSE113486中诊断卵巢癌的AUC分别为0.85和0.86。结论 血清miRNA液体活检对早期卵巢癌的诊断有较高的临床价值。
文摘目的观察产时超声联合Kielland’s产钳在第二产程中的应用效果。方法选取2020年8月至2022年8月在湖州市妇幼保健院进行足月分娩的产妇350例进行回顾性分析,根据应用超声辅助Kielland’s产钳助产情况,分为观察组(n=242)和对照组(n=108)。观察组在第二产程中应用超声辅助Kielland’s产钳进行助产分娩,对照组进行二程剖宫产。比较两组产妇和新生儿的并发症情况,包括产妇产后出血、绒毛膜羊膜炎、产后尿潴留、产后发热等,以及新生儿窒息和新生儿重症监护病房(neonatal intensive care unit,NICU)入住情况。结果观察组的产后出血、绒毛膜羊膜炎及住院天数均低于对照组,产后尿潴留发生率高于对照组,差异均有统计学意义(P<0.05);两组的新生儿NICU入住率及窒息率比较,差异均无统计学意义(P>0.05)。结论产时超声联合辅助Kielland’s产钳分娩,不仅不增加产妇或新生儿不良妊娠结局的发生,反而可以实现阴道助产,改善分娩结局,降低剖宫产率。
