Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flo...Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flow was investigated in an effort to mitigate the inherent temperature gradient problem of the conventional battery system with a unidirectional coolant flow with computational fluid dynamics(CFD). Orthogonal experiment and optimization design method based on computational fluid dynamics virtual experiments were developed. A set of optimized design factors for the cooling of reciprocating air flow of LIB thermal management was determined. The simulation experiments show that the reciprocating flow can achieve good heat dissipation, reduce the temperature difference, improve the temperature homogeneity and effectively lower the maximal temperature of the modular battery. The reciprocating flow improves the safety, long-term performance and life span of LIB.展开更多
In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel wor...In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel works was built. An air-flow segregation feeding (ASF) experimental equipment was designed to simulate strand feeding process and calculate the lower fuel consumption quantity. Compared with baseline test, the ASF experimental equipment was adopted. The results of sinter pot tests show that the solid fuel consumption is lower than that in baseline test, which is decreased by 5.8%. Meanwhile, other sinter indexes, such as pan yeild, tumbler strength and strand productivity are improved. The mineralogical examination indicates that the mineral compositions and micostructures are improved in sinter.展开更多
The air-flow’s states and ways acted on the technological process of chemical fiber are summed up, which includes chip drying, spinning quenching as well as airjet texturing (air texturing, tangling texturing and bul...The air-flow’s states and ways acted on the technological process of chemical fiber are summed up, which includes chip drying, spinning quenching as well as airjet texturing (air texturing, tangling texturing and bulked continuous filament (BCF)),and the effect of air-flow on the process and quality of chemical fiber is studied,and the action of mechanics and heat on the bulked continuous filament are calculated.展开更多
In this paper,the Reynolds number,velocity,pressureand kinetic energy of the BCF processing hot air-floware analyzed with the help of the aero-dynamic theory,and their distributions inside the texturing tube are ob-ta...In this paper,the Reynolds number,velocity,pressureand kinetic energy of the BCF processing hot air-floware analyzed with the help of the aero-dynamic theory,and their distributions inside the texturing tube are ob-tained by pressure measuring.展开更多
目的通过组织实施换气次数检测实验室能力验证计划,探索实验动物设施环境领域能力验证方式,初步了解相关实验室在标准应用及检测水平的现状,规范换气次数检测方法,确保检测结果的准确性和可靠性。方法2023年9—11月,中国食品药品检定研...目的通过组织实施换气次数检测实验室能力验证计划,探索实验动物设施环境领域能力验证方式,初步了解相关实验室在标准应用及检测水平的现状,规范换气次数检测方法,确保检测结果的准确性和可靠性。方法2023年9—11月,中国食品药品检定研究院负责组织开展实验动物设施换气次数检测的实验室能力验证计划(编号NIFDC-PT-417)。此次能力验证计划的现场测试分为两个部分:笔试和实际操作。笔试采用开卷形式,判断题着重考察参加者对标准条款的掌握情况,应用题则是通过构建模拟检测场景考察实验人员对数据处理的应用;实际操作按照中国合格评定国家认可委员会(China National Accreditation Service for Conformity Assessment,CNAS)相关准则,通过分割水平样品对的形式,准备2个实验房间作为能力验证样品。2个房间均按照CNAS相关要求,经过均匀性、稳定性测试,并且测试结果合格。参与能力验证的实验室需要对这2个实验间各进行3次测试,要求在规定时间内完成换气次数的检测和计算,并提交本次检测的结果报告单和原始记录。结果共有27家实验室报名并参加本次能力验证,均在规定时间内反馈结果,所有参测实验室的结果均被评定为满意。结论本次能力验证客观且科学地评估了国内部分实验室在换气次数方面的检测能力,有效地促进了行业整体检测水平的提升,为监管部门规范检测机构提供了技术支撑,为委托单位购买检测服务提供了可靠的参考依据。通过本次能力验证,组织方发现部分实验室对仪器的校准及校准结果的利用不够充分,未来需进一步完善相关标准,以提高检测的准确性和可靠性。展开更多
Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the ex...Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the existing methods are inherently limited to micron resolution,which makes them untenable for fabricating complex 3D architectures with high-definition features.Here,an electrohydrodynamic jet(E-Jet)nanoprinting strategy has been proposed to fabricate PZT 3D structures with the characteristics of flexibility and scalability.Different kinds of 3D PZT true nanostructures(resolution∼40 nm,aspect ratio∼400)were directly fabricated using a 100μm-sized nozzle.And the PZT nanostructures exhibited well-developed perovskite crystal morphology,large elastic strain(elongation≈13%),and high piezoelectric property(d_(31)≈(236.5×10^(−12))C·N^(-1)).A bionic PZT air-flow sensor was printed to monitor air-flow detection,demonstrating well sensitivity with ultra-slow air-flow of 0.02 m·s^(-1).The discovery reveals an efficient pathway to 3D-printing PZT nanostructures for next-generation high-performance piezoelectric devices.展开更多
基金Project(50803008)supported by the National Natural Science Foundation of ChinaProjects(14JJ4035,2011RS4067)supported by the Natural Science Foundation of Hunan Province,China+1 种基金Project(2013-sdllmd-08)supported by the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology),ChinaProjects(20100480946,201104508)supported by the China Postdoctoral Science Foundation,China
文摘Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flow was investigated in an effort to mitigate the inherent temperature gradient problem of the conventional battery system with a unidirectional coolant flow with computational fluid dynamics(CFD). Orthogonal experiment and optimization design method based on computational fluid dynamics virtual experiments were developed. A set of optimized design factors for the cooling of reciprocating air flow of LIB thermal management was determined. The simulation experiments show that the reciprocating flow can achieve good heat dissipation, reduce the temperature difference, improve the temperature homogeneity and effectively lower the maximal temperature of the modular battery. The reciprocating flow improves the safety, long-term performance and life span of LIB.
基金Project(NECT-04-0748) supported by New Century Excellent Talents Program of China
文摘In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel works was built. An air-flow segregation feeding (ASF) experimental equipment was designed to simulate strand feeding process and calculate the lower fuel consumption quantity. Compared with baseline test, the ASF experimental equipment was adopted. The results of sinter pot tests show that the solid fuel consumption is lower than that in baseline test, which is decreased by 5.8%. Meanwhile, other sinter indexes, such as pan yeild, tumbler strength and strand productivity are improved. The mineralogical examination indicates that the mineral compositions and micostructures are improved in sinter.
文摘The air-flow’s states and ways acted on the technological process of chemical fiber are summed up, which includes chip drying, spinning quenching as well as airjet texturing (air texturing, tangling texturing and bulked continuous filament (BCF)),and the effect of air-flow on the process and quality of chemical fiber is studied,and the action of mechanics and heat on the bulked continuous filament are calculated.
文摘In this paper,the Reynolds number,velocity,pressureand kinetic energy of the BCF processing hot air-floware analyzed with the help of the aero-dynamic theory,and their distributions inside the texturing tube are ob-tained by pressure measuring.
文摘目的通过组织实施换气次数检测实验室能力验证计划,探索实验动物设施环境领域能力验证方式,初步了解相关实验室在标准应用及检测水平的现状,规范换气次数检测方法,确保检测结果的准确性和可靠性。方法2023年9—11月,中国食品药品检定研究院负责组织开展实验动物设施换气次数检测的实验室能力验证计划(编号NIFDC-PT-417)。此次能力验证计划的现场测试分为两个部分:笔试和实际操作。笔试采用开卷形式,判断题着重考察参加者对标准条款的掌握情况,应用题则是通过构建模拟检测场景考察实验人员对数据处理的应用;实际操作按照中国合格评定国家认可委员会(China National Accreditation Service for Conformity Assessment,CNAS)相关准则,通过分割水平样品对的形式,准备2个实验房间作为能力验证样品。2个房间均按照CNAS相关要求,经过均匀性、稳定性测试,并且测试结果合格。参与能力验证的实验室需要对这2个实验间各进行3次测试,要求在规定时间内完成换气次数的检测和计算,并提交本次检测的结果报告单和原始记录。结果共有27家实验室报名并参加本次能力验证,均在规定时间内反馈结果,所有参测实验室的结果均被评定为满意。结论本次能力验证客观且科学地评估了国内部分实验室在换气次数方面的检测能力,有效地促进了行业整体检测水平的提升,为监管部门规范检测机构提供了技术支撑,为委托单位购买检测服务提供了可靠的参考依据。通过本次能力验证,组织方发现部分实验室对仪器的校准及校准结果的利用不够充分,未来需进一步完善相关标准,以提高检测的准确性和可靠性。
基金supported by National Natural Science Foundation of China(Grant No.52105577)Natural Science Foundation of Zhejiang Province(Grant No.LQ22E050001)+3 种基金Natural Science Foundation of Ningbo(Grant Nos.2024J427 and 2023J376)China Postdoctoral Science Foundation(Grant No.2024M753510)Ningbo Yongjiang Talent Introduction Programme(Grant No.2021A-137-G)Research Grants Council of the Hong Kong Special Administrative Region,China(Grant Nos.11200623 and RFS2021-1S05).
文摘Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the existing methods are inherently limited to micron resolution,which makes them untenable for fabricating complex 3D architectures with high-definition features.Here,an electrohydrodynamic jet(E-Jet)nanoprinting strategy has been proposed to fabricate PZT 3D structures with the characteristics of flexibility and scalability.Different kinds of 3D PZT true nanostructures(resolution∼40 nm,aspect ratio∼400)were directly fabricated using a 100μm-sized nozzle.And the PZT nanostructures exhibited well-developed perovskite crystal morphology,large elastic strain(elongation≈13%),and high piezoelectric property(d_(31)≈(236.5×10^(−12))C·N^(-1)).A bionic PZT air-flow sensor was printed to monitor air-flow detection,demonstrating well sensitivity with ultra-slow air-flow of 0.02 m·s^(-1).The discovery reveals an efficient pathway to 3D-printing PZT nanostructures for next-generation high-performance piezoelectric devices.
