High-temperature piezoelectric vibration sensors are the preferred choice for structural health monitoring in harsh environments such as high temperatures and complex vibrations.Bismuth layer-structured CaBi_(4)Ti_(4)...High-temperature piezoelectric vibration sensors are the preferred choice for structural health monitoring in harsh environments such as high temperatures and complex vibrations.Bismuth layer-structured CaBi_(4)Ti_(4)O_(15)(CBT)high-temperature piezoelectric ceramics,with high Curie temperature(TC),are the key components for piezoelectric vibration sensors operating at temperatures exceeding 500℃.However,their low piezoelectric coefficient(d_(33))greatly limits their high-temperature applications.In this work,a novel Bi^(3+)self-doping strategy was employed to enhance the piezoelectric performance of CBT ceramics.The enhancement is attributed to an increase in the number of grain boundaries,providing more sites for space charge accumulation and promoting formation of space charge polarization.Furthermore,given that space charge polarization predominantly occurs at low frequencies,dielectric temperature spectra at different frequencies were used to elucidate the mechanism by which space charge polarization enhances piezoelectric properties of CBT ceramics.Excellent overall performance was achieved for the CBT-based high-temperature piezoelectric ceramics.Among them,TC reached 778℃,d_(33) increased by more than 30%,reaching 20.1 pC/N,and the electrical resistivity improved by one order of magnitude(reaching 6.33×10^(6)Ω·cm at 500℃).These advancements provide a key functional material with excellent performance for practical applications of piezoelectric vibration sensors at 500℃and above.展开更多
等离子体处理作为一种高效的表面改性技术,在二维纳米材料/碳基复合结构的形貌调控中具有独特优势。本文通过调控等离子体处理参数(例如气体氛围),研究其对二硫化钨/碳(WS2/C)复合结构表面形貌和缺陷分布的影响。结合扫描电子显微镜(Sca...等离子体处理作为一种高效的表面改性技术,在二维纳米材料/碳基复合结构的形貌调控中具有独特优势。本文通过调控等离子体处理参数(例如气体氛围),研究其对二硫化钨/碳(WS2/C)复合结构表面形貌和缺陷分布的影响。结合扫描电子显微镜(Scanning Electron Microscope,SEM)和基于拉曼光谱的表征,揭示了等离子体处理诱导的WS2边缘选择性和碳纳米纤维骨架的协同效应,提高了复合材料的比表面积和边缘活性位点暴露程度。试验结果表明,参数优化后,等离子体处理可以有效调控WS2纳米晶片在碳纤维骨架中的分散性,并抑制晶片层间堆叠和层片团聚,从而增加边缘位置的暴露程度。该研究为高性能WS2/C复合材料的可控制备提供了新思路,推动其在能源存储与转换领域的实际应用。展开更多
针对触摸屏监控系统不能满足大中型立体仓库对数据进行存储和处理的功能需求,在Visual Studio 2019集成开发环境中,采用C#语言开发一套立体仓库上位机控制系统。以多线程的方式实时读取库位信息;以S7-1200 PLC作为主控制器,设计产品的...针对触摸屏监控系统不能满足大中型立体仓库对数据进行存储和处理的功能需求,在Visual Studio 2019集成开发环境中,采用C#语言开发一套立体仓库上位机控制系统。以多线程的方式实时读取库位信息;以S7-1200 PLC作为主控制器,设计产品的自动入库和自动出库程序流程,采用SCL语言设计了库位先进先出的控制程序。C#和S7-1200 PLC之间采用S7通信的方式控制立体仓库的出入库操作和库位信息采集,3年的现场运行情况表明,整个系统能在上位机上对立体仓库进行手动控制和自动控制,能精确快速地进行入库出库操作,运行平稳,上位机上能正确实时显示库位信息,达到了预期的结果。展开更多
Biomass-derived heteroatom self-doped cathode catalysts has attracted considerable interest for electrochemical advanced oxidation processes(EAOPs)due to its high performance and sustainable synthesis.Herein,we illust...Biomass-derived heteroatom self-doped cathode catalysts has attracted considerable interest for electrochemical advanced oxidation processes(EAOPs)due to its high performance and sustainable synthesis.Herein,we illustrated the morphological fates of waste leaf-derived graphitic carbon(WLGC)produced from waste ginkgo leaves via pyrolysis temperature regulation and used as bifunctional cathode catalyst for simultaneous H_(2)O_(2) electrochemical generation and organic pollutant degradation,discovering S/N-self-doping shown to facilitate a synergistic effect on reactive oxygen species(ROS)generation.Under the optimum temperature of 800℃,the WLGC exhibited a H_(2)O_(2) selectivity of 94.2%and tetracycline removal of 99.3%within 60 min.Density functional theory calculations and in-situ Fourier transformed infrared spectroscopy verified that graphitic N was the critical site for H_(2)O_(2) generation.While pyridinic N and thiophene S were the main active sites responsible for OH generation,N vacancies were the active sites to produce ^(1)O_(2) from O_(2).The performance of the novel cathode for tetracycline degradation remains well under a wide pH range(3–11),maintaining excellent stability in 10 cycles.It is also industrially applicable,achieving satisfactory performance treating in real water matrices.This system facilitates both radical and non-radical degradation,offering valuable advances in the preparation of cost-effective and sustainable electrocatalysts and hold strong potentials in metal-free EAOPs for organic pollutant degradation.展开更多
目的探究血清网膜素-1(Omentin-1)、补体/C1q肿瘤坏死因子相关蛋白9(CTRP-9)水平与急性脑梗死(ACI)神经功能康复的相关性。方法选取2022年11月至2024年2月于该院治疗的ACI患者106例作为研究组,其中包括ACI神经功能康复良好患者62例(良好...目的探究血清网膜素-1(Omentin-1)、补体/C1q肿瘤坏死因子相关蛋白9(CTRP-9)水平与急性脑梗死(ACI)神经功能康复的相关性。方法选取2022年11月至2024年2月于该院治疗的ACI患者106例作为研究组,其中包括ACI神经功能康复良好患者62例(良好组)和康复不良患者44例(不良组)。采用酶联免疫吸附试验检测所有研究对象的血清Omentin-1、CTRP-9水平;采用Spearman相关性分析血清Omentin-1、CTRP-9水平与ACI患者入院时的美国国立卫生研究院卒中量表(NIHSS)评分及脑梗死体积的相关性;采用多因素Logistic回归分析ACI患者神经功能康复不良的影响因素;采用受试者工作特征(ROC)曲线分析血清Omentin-1、CTRP-9水平对ACI患者神经功能康复不良的诊断价值。结果良好组血清Omentin-1、CTRP-9水平明显高于不良组(P<0.05),入院时NIHSS评分、脑梗死面积和发病90 d时改良Rankin量表(mRS)评分明显低于不良组(P<0.05);Spearman相关性分析显示,血清Omentin-1、CTRP-9水平与90 d mRS评分呈负相关(r=-0.648,-0.573,均P<0.001);多因素Logistic回归分析结果显示,90 d mRS评分是ACI患者神经功能康复不良的危险因素(P<0.05),血清Omentin-1、CTRP-9水平是ACI患者神经功能康复不良的保护因素(P<0.05);ROC曲线分析结果显示,血清Omentin-1、CTRP-9水平诊断ACI患者神经功能康复不良的曲线下面积(AUC)为0.843、0.828,二者联合诊断的AUC为0.937,明显大于二者单独诊断(Z_(二者联合-Omentin-1)=2.321,P=0.020;Z_(二者联合-CTRP-9)=2.532,P=0.011)。结论ACI神经功能康复不良患者血清Omentin-1、CTRP-9水平明显降低,且Omentin-1、CTRP-9水平与90 d mRS评分呈负相关,与神经功能康复情况密切相关。展开更多
基金National Natural Science Foundation of China (51932010)。
文摘High-temperature piezoelectric vibration sensors are the preferred choice for structural health monitoring in harsh environments such as high temperatures and complex vibrations.Bismuth layer-structured CaBi_(4)Ti_(4)O_(15)(CBT)high-temperature piezoelectric ceramics,with high Curie temperature(TC),are the key components for piezoelectric vibration sensors operating at temperatures exceeding 500℃.However,their low piezoelectric coefficient(d_(33))greatly limits their high-temperature applications.In this work,a novel Bi^(3+)self-doping strategy was employed to enhance the piezoelectric performance of CBT ceramics.The enhancement is attributed to an increase in the number of grain boundaries,providing more sites for space charge accumulation and promoting formation of space charge polarization.Furthermore,given that space charge polarization predominantly occurs at low frequencies,dielectric temperature spectra at different frequencies were used to elucidate the mechanism by which space charge polarization enhances piezoelectric properties of CBT ceramics.Excellent overall performance was achieved for the CBT-based high-temperature piezoelectric ceramics.Among them,TC reached 778℃,d_(33) increased by more than 30%,reaching 20.1 pC/N,and the electrical resistivity improved by one order of magnitude(reaching 6.33×10^(6)Ω·cm at 500℃).These advancements provide a key functional material with excellent performance for practical applications of piezoelectric vibration sensors at 500℃and above.
文摘等离子体处理作为一种高效的表面改性技术,在二维纳米材料/碳基复合结构的形貌调控中具有独特优势。本文通过调控等离子体处理参数(例如气体氛围),研究其对二硫化钨/碳(WS2/C)复合结构表面形貌和缺陷分布的影响。结合扫描电子显微镜(Scanning Electron Microscope,SEM)和基于拉曼光谱的表征,揭示了等离子体处理诱导的WS2边缘选择性和碳纳米纤维骨架的协同效应,提高了复合材料的比表面积和边缘活性位点暴露程度。试验结果表明,参数优化后,等离子体处理可以有效调控WS2纳米晶片在碳纤维骨架中的分散性,并抑制晶片层间堆叠和层片团聚,从而增加边缘位置的暴露程度。该研究为高性能WS2/C复合材料的可控制备提供了新思路,推动其在能源存储与转换领域的实际应用。
文摘针对触摸屏监控系统不能满足大中型立体仓库对数据进行存储和处理的功能需求,在Visual Studio 2019集成开发环境中,采用C#语言开发一套立体仓库上位机控制系统。以多线程的方式实时读取库位信息;以S7-1200 PLC作为主控制器,设计产品的自动入库和自动出库程序流程,采用SCL语言设计了库位先进先出的控制程序。C#和S7-1200 PLC之间采用S7通信的方式控制立体仓库的出入库操作和库位信息采集,3年的现场运行情况表明,整个系统能在上位机上对立体仓库进行手动控制和自动控制,能精确快速地进行入库出库操作,运行平稳,上位机上能正确实时显示库位信息,达到了预期的结果。
基金financially supported by National Key R&D Program International Cooperation Project(2023YFE0108100)Natural Science Foundation of China(No.52170085)+2 种基金Key Project of Natural Science Foundation of Tianjin(No.21JCZDJC00320)Tianjin Post-graduate Students Research and Innovation Project(2021YJSB013)Fundamental Research Funds for the Central Universities,Nankai University.
文摘Biomass-derived heteroatom self-doped cathode catalysts has attracted considerable interest for electrochemical advanced oxidation processes(EAOPs)due to its high performance and sustainable synthesis.Herein,we illustrated the morphological fates of waste leaf-derived graphitic carbon(WLGC)produced from waste ginkgo leaves via pyrolysis temperature regulation and used as bifunctional cathode catalyst for simultaneous H_(2)O_(2) electrochemical generation and organic pollutant degradation,discovering S/N-self-doping shown to facilitate a synergistic effect on reactive oxygen species(ROS)generation.Under the optimum temperature of 800℃,the WLGC exhibited a H_(2)O_(2) selectivity of 94.2%and tetracycline removal of 99.3%within 60 min.Density functional theory calculations and in-situ Fourier transformed infrared spectroscopy verified that graphitic N was the critical site for H_(2)O_(2) generation.While pyridinic N and thiophene S were the main active sites responsible for OH generation,N vacancies were the active sites to produce ^(1)O_(2) from O_(2).The performance of the novel cathode for tetracycline degradation remains well under a wide pH range(3–11),maintaining excellent stability in 10 cycles.It is also industrially applicable,achieving satisfactory performance treating in real water matrices.This system facilitates both radical and non-radical degradation,offering valuable advances in the preparation of cost-effective and sustainable electrocatalysts and hold strong potentials in metal-free EAOPs for organic pollutant degradation.
文摘目的探究血清网膜素-1(Omentin-1)、补体/C1q肿瘤坏死因子相关蛋白9(CTRP-9)水平与急性脑梗死(ACI)神经功能康复的相关性。方法选取2022年11月至2024年2月于该院治疗的ACI患者106例作为研究组,其中包括ACI神经功能康复良好患者62例(良好组)和康复不良患者44例(不良组)。采用酶联免疫吸附试验检测所有研究对象的血清Omentin-1、CTRP-9水平;采用Spearman相关性分析血清Omentin-1、CTRP-9水平与ACI患者入院时的美国国立卫生研究院卒中量表(NIHSS)评分及脑梗死体积的相关性;采用多因素Logistic回归分析ACI患者神经功能康复不良的影响因素;采用受试者工作特征(ROC)曲线分析血清Omentin-1、CTRP-9水平对ACI患者神经功能康复不良的诊断价值。结果良好组血清Omentin-1、CTRP-9水平明显高于不良组(P<0.05),入院时NIHSS评分、脑梗死面积和发病90 d时改良Rankin量表(mRS)评分明显低于不良组(P<0.05);Spearman相关性分析显示,血清Omentin-1、CTRP-9水平与90 d mRS评分呈负相关(r=-0.648,-0.573,均P<0.001);多因素Logistic回归分析结果显示,90 d mRS评分是ACI患者神经功能康复不良的危险因素(P<0.05),血清Omentin-1、CTRP-9水平是ACI患者神经功能康复不良的保护因素(P<0.05);ROC曲线分析结果显示,血清Omentin-1、CTRP-9水平诊断ACI患者神经功能康复不良的曲线下面积(AUC)为0.843、0.828,二者联合诊断的AUC为0.937,明显大于二者单独诊断(Z_(二者联合-Omentin-1)=2.321,P=0.020;Z_(二者联合-CTRP-9)=2.532,P=0.011)。结论ACI神经功能康复不良患者血清Omentin-1、CTRP-9水平明显降低,且Omentin-1、CTRP-9水平与90 d mRS评分呈负相关,与神经功能康复情况密切相关。
