Digital light processing(DLP)is a crucial additive manufacturing(AM)technique for producing high-precision ceramic com-ponents.This study aims to optimize the formulation of Si_(3)N_(4)slurry to enhance both its perfo...Digital light processing(DLP)is a crucial additive manufacturing(AM)technique for producing high-precision ceramic com-ponents.This study aims to optimize the formulation of Si_(3)N_(4)slurry to enhance both its performance and manufacturability in the DLP process,and investigate key factors such as particle size distribution,photopolymer resin monomer ratios,and dispersant types to im-prove the slurry’s rheological properties.Through these optimizations,a photosensitive Si_(3)N_(4)slurry with 50vol%solid content was de-veloped,exhibiting excellent stability,and low viscosity(2.48 Pa·s at a shear rate of 12.8 s^(-1)).The effects of gas-pressure sintering on the material’s phase composition,microstructure,and mechanical properties were further explored,revealing that this technique significantly increases the flexural strength of the green sample from(109±10.24)to(618±42.15)MPa.The sintered ceramics exhibited high hard-ness((16.59±0.05)GPa)and improved fracture toughness((4.45±0.03)MPa·m^(1/2)).Crack trajectory analysis revealed that crack deflec-tion,crack bridging,and the pull-out of rod-likeβ-Si_(3)N_(4)grains,are the main toughening mechanisms,which could effectively mitigate crack propagation.Among these mechanisms,crack deflection and bridging were particularly influential,significantly enhancing the frac-ture toughness of the Si_(3)N_(4)matrix.Overall,this research highlights how monomer formulation and gas-pressure sintering strengthen the performance of Si_(3)N_(4)slurry in the DLP three-dimensional printing technique.This work is expected to provide new insights for fabricat-ing complex Si_(3)N_(4)ceramic components with superior mechanical properties.展开更多
目的观察多模态磁共振成像(MRI)和计算机体层摄影(CT)检查对超时间窗或发病时间不明急性缺血性脑卒中(AIS)患者总体疗效及预后的影响。方法回顾性分析80例超时间窗或发病时间不明AIS患者的临床资料。比较行多模态MRI检查(MRI组)与行多模...目的观察多模态磁共振成像(MRI)和计算机体层摄影(CT)检查对超时间窗或发病时间不明急性缺血性脑卒中(AIS)患者总体疗效及预后的影响。方法回顾性分析80例超时间窗或发病时间不明AIS患者的临床资料。比较行多模态MRI检查(MRI组)与行多模态CT检查(CT组)的一般临床资料、检查时效性与治疗效果。对比分析MRI组与CT组中接受血管内治疗(EVT)的患者;再灌注治疗病例(再灌注治疗组)与内科常规治疗病例(内科常规治疗组)的预后情况。结果MRI组检查时间较CT组长(P<0.001)。但两组疗效及两组中接受EVT治疗的患者疗效差异均无统计学意义(P>0.05)。MRI组磁敏感成像(SWI)发现14例存在磁敏感血管征(包括5例双层磁敏感血管征),提示心源性血栓,23例存在微出血灶,CT组在血栓特征及微出血检测方面未发现具有诊断意义的相应征象(P<0.001)。再灌注治疗组患者的预后(90 d mRS评分)优于内科常规治疗组(P<0.05)。结论多模态MRI评估超时间窗或发病时间不明AIS临床结局与多模态CT相当,但其可提供更全面的影像学证据。展开更多
Flexible electronics are transforming our lives by making daily activities more convenient.Central to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabricati...Flexible electronics are transforming our lives by making daily activities more convenient.Central to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and versatility.Graphene,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and sensors.The combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical sensors.Here,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning techniques.The ability of FGFETs to sense strains and biomolecular charges opens up diverse application possibilities.We specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical sensors.Finally,we discuss the current challenges and prospects of FGFETs and their applications in biomedical sensors.This review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.展开更多
目的探讨脊髓小脑性共济失调3型(spinocerebellar ataxia type 3,SCA3)患者体质量指数(body mass index,BMI)与疾病严重程度的相关关系。方法选择2022年7月—2023年8月福建医科大学附属第一医院神经内科确诊为SCA3的患者作为病例组,2024...目的探讨脊髓小脑性共济失调3型(spinocerebellar ataxia type 3,SCA3)患者体质量指数(body mass index,BMI)与疾病严重程度的相关关系。方法选择2022年7月—2023年8月福建医科大学附属第一医院神经内科确诊为SCA3的患者作为病例组,2024年6月—2024年10月的健康个体作为对照组。比较两组的BMI。收集患者人口统计学及临床统计学资料,采用共济失调等级量表评估SCA3患者共济失调的严重程度,并评估BMI与疾病严重程度的关系。结果共纳入患者101例,健康个体101例。SCA3患者较正常对照人群BMI水平降低(t=-2.370,P=0.019)。多重线性回归分析结果显示,BMI、病程和吸烟史对SCA3患者疾病严重程度有影响(P<0.05),病程和疾病严重程度对SCA3患者疾病进展有影响(P<0.05)。结论SCA3患者BMI与疾病严重程度存在相关性,通过控制BMI水平可能有助于SCA3患者的病情控制。展开更多
基金supported in part by the National Natural Science Foundation of China.(Nos.62461160259,92360307 and 92267103).
文摘Digital light processing(DLP)is a crucial additive manufacturing(AM)technique for producing high-precision ceramic com-ponents.This study aims to optimize the formulation of Si_(3)N_(4)slurry to enhance both its performance and manufacturability in the DLP process,and investigate key factors such as particle size distribution,photopolymer resin monomer ratios,and dispersant types to im-prove the slurry’s rheological properties.Through these optimizations,a photosensitive Si_(3)N_(4)slurry with 50vol%solid content was de-veloped,exhibiting excellent stability,and low viscosity(2.48 Pa·s at a shear rate of 12.8 s^(-1)).The effects of gas-pressure sintering on the material’s phase composition,microstructure,and mechanical properties were further explored,revealing that this technique significantly increases the flexural strength of the green sample from(109±10.24)to(618±42.15)MPa.The sintered ceramics exhibited high hard-ness((16.59±0.05)GPa)and improved fracture toughness((4.45±0.03)MPa·m^(1/2)).Crack trajectory analysis revealed that crack deflec-tion,crack bridging,and the pull-out of rod-likeβ-Si_(3)N_(4)grains,are the main toughening mechanisms,which could effectively mitigate crack propagation.Among these mechanisms,crack deflection and bridging were particularly influential,significantly enhancing the frac-ture toughness of the Si_(3)N_(4)matrix.Overall,this research highlights how monomer formulation and gas-pressure sintering strengthen the performance of Si_(3)N_(4)slurry in the DLP three-dimensional printing technique.This work is expected to provide new insights for fabricat-ing complex Si_(3)N_(4)ceramic components with superior mechanical properties.
文摘目的观察多模态磁共振成像(MRI)和计算机体层摄影(CT)检查对超时间窗或发病时间不明急性缺血性脑卒中(AIS)患者总体疗效及预后的影响。方法回顾性分析80例超时间窗或发病时间不明AIS患者的临床资料。比较行多模态MRI检查(MRI组)与行多模态CT检查(CT组)的一般临床资料、检查时效性与治疗效果。对比分析MRI组与CT组中接受血管内治疗(EVT)的患者;再灌注治疗病例(再灌注治疗组)与内科常规治疗病例(内科常规治疗组)的预后情况。结果MRI组检查时间较CT组长(P<0.001)。但两组疗效及两组中接受EVT治疗的患者疗效差异均无统计学意义(P>0.05)。MRI组磁敏感成像(SWI)发现14例存在磁敏感血管征(包括5例双层磁敏感血管征),提示心源性血栓,23例存在微出血灶,CT组在血栓特征及微出血检测方面未发现具有诊断意义的相应征象(P<0.001)。再灌注治疗组患者的预后(90 d mRS评分)优于内科常规治疗组(P<0.05)。结论多模态MRI评估超时间窗或发病时间不明AIS临床结局与多模态CT相当,但其可提供更全面的影像学证据。
基金supported by the National Key R&D Plan of China(Grant No.2023YFB3210400)the National Natural Science Foundation of China(No.62174101)+2 种基金the Major Scientific and Technological Innovation Project of Shandong Province(2021CXGC010603)the Fundamental Research Funds of Shandong University(2020QNQT001)Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong,Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong,the Natural Science Foundation of Qingdao-Original exploration project(No.24-4-4-zrjj-139-jch).
文摘Flexible electronics are transforming our lives by making daily activities more convenient.Central to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and versatility.Graphene,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and sensors.The combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical sensors.Here,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning techniques.The ability of FGFETs to sense strains and biomolecular charges opens up diverse application possibilities.We specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical sensors.Finally,we discuss the current challenges and prospects of FGFETs and their applications in biomedical sensors.This review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.
文摘目的探讨脊髓小脑性共济失调3型(spinocerebellar ataxia type 3,SCA3)患者体质量指数(body mass index,BMI)与疾病严重程度的相关关系。方法选择2022年7月—2023年8月福建医科大学附属第一医院神经内科确诊为SCA3的患者作为病例组,2024年6月—2024年10月的健康个体作为对照组。比较两组的BMI。收集患者人口统计学及临床统计学资料,采用共济失调等级量表评估SCA3患者共济失调的严重程度,并评估BMI与疾病严重程度的关系。结果共纳入患者101例,健康个体101例。SCA3患者较正常对照人群BMI水平降低(t=-2.370,P=0.019)。多重线性回归分析结果显示,BMI、病程和吸烟史对SCA3患者疾病严重程度有影响(P<0.05),病程和疾病严重程度对SCA3患者疾病进展有影响(P<0.05)。结论SCA3患者BMI与疾病严重程度存在相关性,通过控制BMI水平可能有助于SCA3患者的病情控制。
