Full-Heusler alloy Fe_(2)TiSn was predicted to be a potential thermoelectric material with high mechanical properties and stability.Fe_(2)TiSn was usually prepared by arc-melting followed by annealing for 2 weeks,whic...Full-Heusler alloy Fe_(2)TiSn was predicted to be a potential thermoelectric material with high mechanical properties and stability.Fe_(2)TiSn was usually prepared by arc-melting followed by annealing for 2 weeks,which takes a long time and consumes a large amount of energy.In this paper,Fe_(2)TiSn was prepared by an ultra-fast method,self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering.The bulk materials with uniform element distribution,well controlled composition and relative densities of over 97.5% were prepared.The undoped Fe_(2)TiSn samples show p-type transport behavior.Co was heavily doped at the Fe site to prepare n-type Fe_(2-2x)Co_(2x) TiSn samples.The thermoelectric properties measurements carried out on the Co-doped samples show a highest ZT=0.02 at 300 K,which is about tripe the performance of the pristine Fe_(2)TiSn.This study provides a new approach for the rapid and low-cost preparation of full-Heusler thermoelectric materials.展开更多
为提高彩色沥青路面色彩耐久性并研究其抗滑性能,采用有机硅-聚丙酸酯(silane-modified polyacrylate,SMP)对彩色沥青玛蹄脂碎石混合料(color stone mastic asphalt,CSMA)和彩色开级配抗滑表层(color open graded friction course,COGF...为提高彩色沥青路面色彩耐久性并研究其抗滑性能,采用有机硅-聚丙酸酯(silane-modified polyacrylate,SMP)对彩色沥青玛蹄脂碎石混合料(color stone mastic asphalt,CSMA)和彩色开级配抗滑表层(color open graded friction course,COGFC)2种混合料改性,借助小型加速加载设备进行对彩色沥青路面进行色彩耐久性评价,并通过三维扫描仪进行路面纹理信息采集,分析路面三维参数与其抗滑性能之间的关系。结果表明,SMP改性剂可有效提高CSMA、COGFC两种混合料的抗磨耗能力,提升彩色沥青色彩耐久性;CSMA及COGFC路面抗滑性能受到不同三维参数的影响,路面的摩擦系数模型由各自相关因子控制,增加路面暴露的集料数量和使用尖角集料能使彩色沥青路面的抗滑性能得到提升。展开更多
迄今为止,由于传统的神经成像技术受到人工耳蜗植入物的磁性限制,测评成人和儿童在植入后的语音加工的神经活动一直是一个极大的挑战。功能性近红外光谱(functional near infrared spectroscopy,fNIRS)是一种大脑神经成像的非侵入性且...迄今为止,由于传统的神经成像技术受到人工耳蜗植入物的磁性限制,测评成人和儿童在植入后的语音加工的神经活动一直是一个极大的挑战。功能性近红外光谱(functional near infrared spectroscopy,fNIRS)是一种大脑神经成像的非侵入性且可以与植入设备兼容的成像技术,并且不受电学伪影的影响,适用于成人和儿童植入者的语音加工的神经活动的测评,能更好的识别和解释皮质反应。本文旨在总结fNIRS测评人工耳蜗植入者的不同类型语音刺激的语音加工的神经激活水平,为植入者的听觉言语康复评估以及康复方案的制定提供客观依据。展开更多
Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the gl...Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the glasses were studied by using X-ray diffractometer(XRD),infrared spectrometer(FIT-IR),thermal dilatometer and differential thermal analyzer(DTA).Chemical durability of the glasses was studied by using dissolution rate method.Wettability of glasses on substrate was tested by using button sintering experiment.It is found that alkaline resistance of the glass solders is lower than that of plate glass and the water resistance is comparable with that of plate glass.The sealing temperatures are Ts=445-490℃,while the average thermal expansion coefficient from room temperature to 300℃is in the range of(65-82)×10^(−7)℃^(−1).At sealing temperature,the glass solders have good wettability on plate glass or alumina substrate.They are not crystallized even sintered at the sealing temperature for 30 min.The solder glasses are suitable for sealing plate glass,alumina and other inorganic non-metallic materials.展开更多
基金Funded by the Laboratory Open Fund of Beijing Smart-chip Microelectronics Technology Co.,Ltd。
文摘Full-Heusler alloy Fe_(2)TiSn was predicted to be a potential thermoelectric material with high mechanical properties and stability.Fe_(2)TiSn was usually prepared by arc-melting followed by annealing for 2 weeks,which takes a long time and consumes a large amount of energy.In this paper,Fe_(2)TiSn was prepared by an ultra-fast method,self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering.The bulk materials with uniform element distribution,well controlled composition and relative densities of over 97.5% were prepared.The undoped Fe_(2)TiSn samples show p-type transport behavior.Co was heavily doped at the Fe site to prepare n-type Fe_(2-2x)Co_(2x) TiSn samples.The thermoelectric properties measurements carried out on the Co-doped samples show a highest ZT=0.02 at 300 K,which is about tripe the performance of the pristine Fe_(2)TiSn.This study provides a new approach for the rapid and low-cost preparation of full-Heusler thermoelectric materials.
文摘为提高彩色沥青路面色彩耐久性并研究其抗滑性能,采用有机硅-聚丙酸酯(silane-modified polyacrylate,SMP)对彩色沥青玛蹄脂碎石混合料(color stone mastic asphalt,CSMA)和彩色开级配抗滑表层(color open graded friction course,COGFC)2种混合料改性,借助小型加速加载设备进行对彩色沥青路面进行色彩耐久性评价,并通过三维扫描仪进行路面纹理信息采集,分析路面三维参数与其抗滑性能之间的关系。结果表明,SMP改性剂可有效提高CSMA、COGFC两种混合料的抗磨耗能力,提升彩色沥青色彩耐久性;CSMA及COGFC路面抗滑性能受到不同三维参数的影响,路面的摩擦系数模型由各自相关因子控制,增加路面暴露的集料数量和使用尖角集料能使彩色沥青路面的抗滑性能得到提升。
文摘迄今为止,由于传统的神经成像技术受到人工耳蜗植入物的磁性限制,测评成人和儿童在植入后的语音加工的神经活动一直是一个极大的挑战。功能性近红外光谱(functional near infrared spectroscopy,fNIRS)是一种大脑神经成像的非侵入性且可以与植入设备兼容的成像技术,并且不受电学伪影的影响,适用于成人和儿童植入者的语音加工的神经活动的测评,能更好的识别和解释皮质反应。本文旨在总结fNIRS测评人工耳蜗植入者的不同类型语音刺激的语音加工的神经激活水平,为植入者的听觉言语康复评估以及康复方案的制定提供客观依据。
基金National Natural Science Foundation of China(52172070)Jiangxi Provincial Natural Science Foundation(20242BAB25222)Jiangxi Provincial Graduate Innovation Special Fund Project(YC2022-S882 and YC2023-S808).
文摘Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the glasses were studied by using X-ray diffractometer(XRD),infrared spectrometer(FIT-IR),thermal dilatometer and differential thermal analyzer(DTA).Chemical durability of the glasses was studied by using dissolution rate method.Wettability of glasses on substrate was tested by using button sintering experiment.It is found that alkaline resistance of the glass solders is lower than that of plate glass and the water resistance is comparable with that of plate glass.The sealing temperatures are Ts=445-490℃,while the average thermal expansion coefficient from room temperature to 300℃is in the range of(65-82)×10^(−7)℃^(−1).At sealing temperature,the glass solders have good wettability on plate glass or alumina substrate.They are not crystallized even sintered at the sealing temperature for 30 min.The solder glasses are suitable for sealing plate glass,alumina and other inorganic non-metallic materials.
