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Effect of temperature tuning on the aerosol acoustic aggregation process

Journal of Environmental Sciences 2018年第5期30卷 161-170页

作者： zhenghui qiao Wei Dong Yaji Huang Vincenzo Naso Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy & Environment Southeast University Department of Mechanical and Aerospace Engineering SAPIENZA University of Rome

Diesel exhaust aerosols（DEAs） can absorb and accumulate toxic metal particulates and bacteria suspended in the atmospheric environment, which impact human health and the *** use of acoustic standing waves（ASWs） to aggregate DEA is currently considered to be an efficient particle removal method; however, study of the effect of different temperatures on the acoustic aggregation process is scarce. To explore the method and technology to regulate and optimize the aerosol aggregation process through temperature tuning, an acoustic apparatus integrated with a temperature regulation function was constructed. Using this apparatus, the effect of different characteristic temperatures（CTs） on the aerosol aggregation process was investigated experimentally in the ASW environment. Under constant conditions of acoustic frequency 1.286 kHz, voltage amplitude 17 V and input electric power 16.7 W, the study concentrated on temperature effects on the aggregation process in the CT range of 58–72℃. The DEA opacity was used. The results demonstrate that the aggregation process is quite sensitive to the CT, and that the optimal DEA aggregation can be achieved at 66℃. The aggregated particles of 68.17 μm are composed of small nanoparticles of 13.34–62.15 nm. At CTs higher and lower than 66℃, the apparatus in non-resonance mode reduces the DEA aggregation level. For other instruments, the method for obtaining the optimum temperature for acoustic agglomeration is universal. This preliminary demonstration shows that the use of acoustic technology to regulate the aerosol aggregation process through tuning the operating temperature is feasible and convenient.

关键词： Diesel exhaust Acoustic field Aggregation Acoustic standing wave Temperature Nanoparticles

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Particulate aggregation through a modulated annular one-dimensional acoustic field at resonant frequencies

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Particuology 2021年第4期19卷 82-94页

作者： zhenghui qiao Xiaojun Pan Shaohua Liang Xiaolong Bi Juan Wang Wei Xie Kang Wang Yanwen Wang Jun Fang Xuefei Zhu Shaoxin Sun Shaohui Li College of Energy and Power Engineering Nanjing Institute of TechnologyNanjing 211167China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

The visualization and analysis of a novel acoustic-particulate system is the objective of this study. The system is composed of rice-husk fired smoke particulates (36.7 nm-840 μm) and one annular resonant circular-tube waveguide contrarily coupled with two sound sources. The collective interaction behavior process of smoke particulates in an inhomogeneous acoustic field is displayed during an experiment and a simulation. The result shows that the aggregation and fragmentation of particles under a change in resonant frequencies and sound pressure amplitude is extremely complex. This complex process consists of dynamically tuning the particle characteristics to attain stripes shaped like thin-films/umbrellas and clusters with volume-change/fragmentation. The balanced modulation of the acoustic radiation force and secondary radiation force to alter the particle characteristics (size and stack density) is verified to be the control mechanism of the particle system. The intermediate variable of the process control is the acoustic contrast factor (Φ) related to the physical characteristics of the growing particulates. The value plus-minus alternation of Φ results in different particulate processes. This study can enhance the application of aerodynamic acoustic-particulate-fluid systems for environment protection, energy fuel conversion, and industrial production.

关键词： Acoustic aggregation Porous particulates Secondary radiation force Acoustic radiation force Stripe pattern Inhomogeneous field

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结构化的复合声场及其操纵颗粒有效性的实验研究

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东南大学学报（自然科学版） 2016年第4期46卷 720-726页

作者：程梅董卫乔正辉东南大学能源与环境学院南京210096 东南大学能源热转换及其过程测控教育部重点实验室南京210096

基于装置各部件固有频率相等的方法,设计制作了一种在平面声腔侧壁离散对称布置16极Helmholtz声源的实验装置,研究了平面声腔内由16极Helmholtz声源构造的复合声场及其对颗粒的操纵特性.通过理论和实验研究了Helmholtz声源的频率特性、... 详细信息

基于装置各部件固有频率相等的方法,设计制作了一种在平面声腔侧壁离散对称布置16极Helmholtz声源的实验装置,研究了平面声腔内由16极Helmholtz声源构造的复合声场及其对颗粒的操纵特性.通过理论和实验研究了Helmholtz声源的频率特性、平面声腔的谐振特性、平面声腔内复合声场的时空变化特性以及复合声场对平面声腔内充注的烟气颗粒操纵的有效性.结果表明:运行频率为1.805 k Hz时,16极Helmholtz声源耦合的平面声腔能够实现同步谐振;平面声腔内形成了声压幅度逐渐衰减的环形复合声场;烟气颗粒被聚集在靠近壁面约0.5个波长的环形区域内,在平面声腔的中部形成了无颗粒区,颗粒聚集区与无颗粒区的面积比约为16∶9.

关键词： Helmholtz声源共振复合声场烟气颗粒

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高强度Helmholtz声源的声学特性研究

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中国机械工程 2018年第10期29卷 1186-1192页

作者：乔正辉董卫程梅周树青东南大学能源与环境学院南京210096

为研究Helmholtz声源的声学特性,设计并制作了一款由扬声器和Helmholtz共振器组成的Helmholtz声源,并对其等效声阻抗、两端电压、输出声压值和电声转换效率随信号频率变化的响应特性进行了初步探索。结果表明,Helmholtz声源的声学特性... 详细信息

为研究Helmholtz声源的声学特性,设计并制作了一款由扬声器和Helmholtz共振器组成的Helmholtz声源,并对其等效声阻抗、两端电压、输出声压值和电声转换效率随信号频率变化的响应特性进行了初步探索。结果表明,Helmholtz声源的声学特性与扬声器和Helmholtz共振器的相互作用有关,Helmholtz声源的声学阻抗特性主要由Helmholtz共振器决定;扬声器的谐振或Helmholtz共振器的共振能够增强Helmholtz声源的声波辐射能力,可以有效提高声源的电声转换效果;在选定的实验条件下,Helmholtz声源的最大输出声压值约是扬声器的22倍,此时Helmholtz声源的电声转换效率高达113%。

关键词：扬声器 Helmholtz共振器共振声压电声转换效率

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对称Helmholtz声源圆柱形波导的声学谐振特性

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东南大学学报（自然科学版） 2014年第3期44卷 579-584页

作者：乔正辉黄亚继董卫东南大学能源热转换及其过程测控教育部重点实验室南京210096

为了构造增强型驻波声场分离烟气颗粒,设计了一种具有对称Helmholtz声源的圆柱形波导驻波增强发生装置.以柱腔的谐振频率作为Helmholtz共振器的共振频率制作声源,通过理论和实验研究了该装置柱腔的共振频率随谐振阶数的变化、驻波的时... 详细信息

为了构造增强型驻波声场分离烟气颗粒,设计了一种具有对称Helmholtz声源的圆柱形波导驻波增强发生装置.以柱腔的谐振频率作为Helmholtz共振器的共振频率制作声源,通过理论和实验研究了该装置柱腔的共振频率随谐振阶数的变化、驻波的时空变化和声能分布,比较了有无Helmholtz声源装置驻波的时空变化,并通过实验展示了烟气颗粒在装置中的分布特征.结果表明:装置运行在设计频率时能够实现共振;一对相反相位Helmholtz声源在柱腔内产生了强驻波,在相同条件下,其强声场区的最大声压幅值是同相位的2.75倍,是无Helmholtz声源时的13.3倍,使烟气颗粒产生了聚散性分离.该装置具有结构简单、驻波品质高、声压强度大等优点,因而可广泛用于烟气颗粒分离.

关键词：谐振 Helmholtz声源声能对称烟气分离

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非均匀热场对PZT微型固态热机有效性影响的试验研究

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东南大学学报（自然科学版） 2018年第6期48卷 1152-1158页

作者：郑敏董卫乔正辉周树青金亚伟东南大学能源与环境学院南京210096

为了研究非均匀热场对微型固态热机热电转换有效性的影响,基于PZT材料的热释电效应设计了3种不同表面吸收率分布的微型固态热机样本.其中,1号微型固态热机是未经处理的低吸收率均匀分布表面; 2号微型固态热机是全覆盖碳墨层的高吸收率... 详细信息

为了研究非均匀热场对微型固态热机热电转换有效性的影响,基于PZT材料的热释电效应设计了3种不同表面吸收率分布的微型固态热机样本.其中,1号微型固态热机是未经处理的低吸收率均匀分布表面; 2号微型固态热机是全覆盖碳墨层的高吸收率均匀分布表面; 3号微型固态热机是局部覆盖碳墨层的非均匀吸收率分布表面.在恒定光源和交变光源激发下对3个微型固态热机样本的温度和电压响应进行了试验研究.结果表明:在相同的恒定输入功率条件下,热机的电压响应值主要受第一热释电效应的影响,温度变化率越大,电压响应值越大;在相同的交变输入功率条件下,因非均匀热场产生的第三热释电效应对电压输出的贡献增强,3号微型固态热机电压输出最大,为-0. 84～0. 96 V,比2号微型固态热机输出电压高80%,比1号热机电压输出电压提高275%.

关键词：非均匀热场固态热机红外成像热电转换

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Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 97-108页

作者： Pan Guo Hong-Bo Jin Cong-Feng qiao Yue-Liang Wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences The School of Physical Sciences University of Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University National Astronomical Observatories Chinese Academy of Sciences Institute of Theoretical Physics Chinese Academy of Sciences

For space-based gravitational wave （GW） detection,the main noise source for massive black hole binaries （MBHBs） is attributed to approximately 10～7double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratio ?DL/DLat the 95%confidence level,is enhanced by factors of ～*** angular resolutions,denoted by??s,are enhanced by a factor of ～*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries

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The cGAS-STING-interferon regulatory factor 7 pathway regulates neuroinflammation in Parkinson's disease

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Neural Regeneration Research 2025年第8期20卷 2361-2372页

作者： Shengyang Zhou Ting Li Wei Zhang Jian Wu Hui Hong Wei Quan Xinyu qiao Chun Cui Chenmeng qiao Weijiang Zhao Yanqin Shen Laboratory of Neurodegenerative and Neuroinjury Diseases Wuxi Medicine SchoolJiangnan UniversityWuxiJiangsu ProvinceChina

Interferon regulatory factor 7 plays a crucial role in the innate immune ***,whether interferon regulatory factor 7-mediated signaling contributes to Parkinson's disease remains *** we report that interferon regulatory factor 7 is markedly up-regulated in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced mouse model of Parkinson's disease and co-localizes with microglial *** the selective cyclic guanosine monophosphate adenosine monophosphate synthase inhibitor RU.521 and the stimulator of interferon genes inhibitor H151 effectively suppressed interferon regulatory factor 7 activation in BV2 microglia exposed to 1-methyl-4-phenylpyridinium and inhibited transformation of mouse BV2 microglia into the neurotoxic M1 *** addition,si RNA-mediated knockdown of interferon regulatory factor 7 expression in BV2 microglia reduced the expression of inducible nitric oxide synthase,tumor necrosis factorα,CD16,CD32,and CD86 and increased the expression of the anti-inflammatory markers ARG1 and *** together,our findings indicate that the cyclic guanosine monophosphate adenosine monophosphate synthase-stimulator of interferon genes-interferon regulatory factor 7 pathway plays a crucial role in the pathogenesis of Parkinson's disease.

关键词： cyclic guanosine monophosphate adenosine monophosphate synthase H151 interferon regulatory factor 7 M1 phenotype neurodegenerative disease neuroinflammation Parkinson’s disease RU521 STING type I interferon

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Impact of Bubbles on Mechanical Performances in a Borosilicate Glass

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 25-29页

作者： LI Chengxing LI Dongfeng MA Shilong qiao Ang ZHENG Qingshuang China Helicopter Research and Development Institute Jingdezhen 333001China State Key Laboratory of Silicate Materials for Ar-chitectures Wuhan University of TechnologyWuhan 430070China

To analyze the impact of bubbles on the mechanical behavior of glasses,by controlling the refining time,we prepared three borosilicate glasses with the same composition and different *** the analysis software integrated within the optical microscope,the diameter and number of the bubbles on the surface of three borosilicate glasses were *** the hardness and crack initiation resistance(CR),we built the relationship between the porosity and the mechanical performance of these borosilicate glasses.

关键词： bubbles oxide glass hardness creak initiation resistance

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Stiffness-tunable biomaterials provide a good extracellular matrix environment for axon growth and regeneration

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Neural Regeneration Research 2025年第5期20卷 1364-1376页

作者： Ronglin Han Lanxin Luo Caiyan Wei Yaru qiao Jiming Xie Xianchao Pan Juan Xing Department of Pathophysiology School of Basic Medical SciencesSouthwest Medical UniversityLuzhouSichuan ProvinceChina Department of Medicinal Chemistry School of PharmacySouthwest Medical UniversityLuzhouSichuan ProvinceChina

Neuronal growth, extension, branching, and formation of neural networks are markedly influenced by the extracellular matrix—a complex network composed of proteins and carbohydrates secreted by cells. In addition to providing physical support for cells, the extracellular matrix also conveys critical mechanical stiffness cues. During the development of the nervous system, extracellular matrix stiffness plays a central role in guiding neuronal growth, particularly in the context of axonal extension, which is crucial for the formation of neural networks. In neural tissue engineering, manipulation of biomaterial stiffness is a promising strategy to provide a permissive environment for the repair and regeneration of injured nervous tissue. Recent research has fine-tuned synthetic biomaterials to fabricate scaffolds that closely replicate the stiffness profiles observed in the nervous system. In this review, we highlight the molecular mechanisms by which extracellular matrix stiffness regulates axonal growth and regeneration. We highlight the progress made in the development of stiffness-tunable biomaterials to emulate in vivo extracellular matrix environments, with an emphasis on their application in neural repair and regeneration, along with a discussion of the current limitations and future prospects. The exploration and optimization of the stiffness-tunable biomaterials has the potential to markedly advance the development of neural tissue engineering.

关键词： alginate axon growth biomaterials extracellular matrix neural repair neurons neuroregeneration polyacrylamide polydimethylsiloxane stiffness

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