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Evolution of microstructure and intervariant boundaries ofαphase in electron beam melted and heat-treated Ti-6Al-4V alloy

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Rare Metals 2021年第8期40卷 2118-2126页

作者： Ming Wang hao-qing li Hong Guo liu Feng Shu-Yu liu Xiao-Ying Fang Institute for Advanced Manufacturing Shandong University of TechnologyZibo255000China Center of Testing and Analysis Shandong University of TechnologyZibo255000China School of Mechanical Engineering Shandong University of TechnologyZibo255000China

It is important to understand the correlation between grain morphology and intervariant boundaries of theαphase after heat treatment belowβtransus of the electron beam melted(EBMed)Ti-6 Al-4 V *** electron microscopy(SEM)and electron backscatter diffraction(EBSD)analysis have shown about 99%αphase and 1%βphase in the heat-treated samples when the temperature rises to 950℃.Four distinct types ofαgrain morphology have been found:allotromorphousα,relatively coarseαplate,large precipitationαand granularα.A single peak of the intervariant boundary with the misorientation of 60°/[1120]associated with Burgers orientation relationship(OR)was found in the allotromorphousα*** intervariant boundaries mixed with a fraction of general high-angle grain boundary(GHABs,not Burgers OR)were present in the relatively coarseαplate *** only low-angle grain boundaries(LABs)with the misorientation of<5°were found in the large precipitationαgrains.βphase tends to distribute around the boundaries of relatively coarseα*** suggests that different formation mechanisms are involved in the distinct types ofαgrain morphology.

关键词： Intervariant boundaries Electron beam melting Ti-6Al-4V alloy Heat treatment

Characterization of products from photooxidation of toluene

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Journal of Environmental Sciences 2006年第5期18卷 903-909页

作者： hao li-qing WANG Zhen-ya FANG li ZHANG Wei-jun WANG Wei li Cheng-xiang SHENG liu-si Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China

Photooxidation reaction of toluene in smog chamber systems was initiated by the UV radiation of tolucne/CH5ONO/NOx mixtures. The products of the photooxidation reaction of toluene and its subsequent reactions were analyzed directly utilizing Fourier transform infrared spectrometer （FTIR）. Detailed assignments to FTIR spectrum of gas-phase products were given. The information of some important functional groups in the products, such as, carbonyl groups （C-O）, hydroxyl groups （-OH）, carboxylic acid （- COOH）, C-C bonding, N O bonding and C-H bonding （C H）, was got from this analysis. These results were compared to those analyzed by aerosol time of flight mass spectrometer （ATOFMS）. It was found that there are some differcnccs between FTIR analysis of gas-phase products and that of particle-phase, for example, the products with carbonyl groups, which were connected to unsaturated chemical bonds, was relatively higher in the gas phase, while kctoncs, aldehydes, carboxylic acid and organonitrates were the dominant functional groups in the aerosol-phase reaction products. The possible reaction pathways of some important products in the gas phase were also discussed.

关键词： toluene photooxidation secondary organic aerosol Fourier transform infrared spectrometer smog chamber

Oxygen vacancy control of electrical,optical,and magnetic properties of Fe_(0.05)Ti_(0.95)O_(2) epitaxial films

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Chinese Physics B 2021年第11期30卷 575-579页

作者： qing-Tao Xia Zhao-Hui li Le-qing Zhang Feng-ling Zhang Xiang-Kun li Heng-Jun liu Fang-Chao Gu Tao Zhang Qiang li qing-hao li College of Physics University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao 266071China

High-quality Fe-doped TiO_(2) films are epitaxially grown on MgF_(2) substrates by pulsed laser *** x-ray diffraction and Raman spectra prove that they are of pure rutile ***-resolution transmission electron microscopy(TEM)further demonstrates that the epitaxial relationship between rutile-phased TiO_(2) and MgF_(2) substrates is 110 TiO_(2)||110 MgF_(2).The room temperature ferromagnetism is detected by alternative gradient *** increasing the ambient oxygen pressure,magnetization shows that it decreases monotonically while absorption edge shows a red *** transport property measurement demonstrates a strong correlation between magnetization and carrier *** influence of ambient oxygen pressure on magnetization can be well explained by a modified bound magnetization polarization model.

关键词： ferromagnetic materials semiconductors epitaxial films rutile TiO_(2)

Size distribution of the secondary organic aerosol particles from the photooxidation of toluene

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Journal of Environmental Sciences 2005年第6期17卷 912-916页

作者： hao li-qing WANG Zhen-ya HUANG Ming-qiang PEI Shi-xin YANG Yong ZHANG Wei-jun Laboratory of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

In a smog chamber, the photooxidation of toluene was initiated by hydroxyl radical （OH.） under different experimental conditions. The size distribution of secondary organic aerosol（SOA） particles from the above reaction was measured using aerodynamic particle sizer spectrometer. It was found from our experimental results that the number of SOA particles increased with increasing the concentration of toluene. As the reaction time prolonged, the sum of SOA particles was also increased. After a reaction time of 130 min, the concentration of secondary organic aerosol particles would be kept constant at 2300 particles/cm^3. Increasing illumination power of blacklamps could significantly induce a higher concentration of secondary organic aerosol particle. The density of SOA particles would also be increased with increasing concentration of CH30NO, however, it would be decreased as soon as the concentration of CH30NO was larger than 225.2 ppm. Nitrogen oxide with initial concentration higher than 30. 1 ppm was also found to have little effect on the formation of secondary organic aerosol.

关键词： toluene hydroxyl radical secondary organic aerosol smog chamber

Observation and mitigation of image distortion in high-energy electron radiography

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Nuclear Science and Techniques 2023年第6期34卷 69-77页

作者： hao-qing li liang Sheng Chang-qing Zhang Ying-Chao Du Zheng Zhou Xiu-Feng Weng Jia-hao Xiao Hong-Qiao Yin Bin Sun Kun Wei Yang li Bao-Jun Duan Yong-Tang liu Yan-Hong Zhang Mei Zhang Yan Song Xiao-Dong Zhang Jun liu Zhu-Ming Fu qing Xu Xue Du Jian-Peng Gao Xin-Yi Wang Xin-Jian Tan Dong-Wei Hei Department of Engineering Physics Tsinghua UniversityBeijing100084China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an710024China Institute of Applied Electronics China Academy of Engineering PhysicsMianyang621900China Institute of Intelligent Machines Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei230031China Zhongke Hefei Institutes of Collaborative Research and Innovation for Intelligent Agriculture Hefei231131China

Image distortion caused by the angular misalignment of quadrupole magnets in high-energy electron radiography has been studied *** propose that the distortion originates from the coupling of the electron motions in the transverse directions,based on a theoretical analysis and the transfer-matrix *** relative angular rotation between the second and third magnetic quadrupoles was identified as the main contributor to image *** was verified by both a beam-dynamics simulation and *** strategies to mitigate this image distortion are also explored,including magnets online tuning,higher beam energy and larger magnification *** study provides criteria for designing experiments and paves the way for achieving higher image precision.

关键词： Misalignment Angular rotation Russian quadruplet Transfer matrix

Time-resolved laser-induced breakdown spectroscopy of aluminum

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Optoelectronics Letters 2008年第5期4卷 369-370页

作者： liU Xian-yun ZHANG Wei-jun WANG Zhen-ya hao li-qing HUANG Ming-qiang Zhao Wen-wu LONG Bo Zhao Wei Laboratory of Environment Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

We develop a system to measure the elemental composition of unprepared samples using laser-induced breakdown spec-troscopy (liBS) in our laboratory,which can be used for the determination of elements in solids,liquids and aerosols. A description of the instrumentation,including laser,sample chamber and detection,is followed by a brief discussion. The time-resolved liBS of aluminum at atmospheric pressure is presented. At the end,the possibilities and later uses of this technique are briefly discussed.

关键词：铝光谱学 liBS 烟雾剂测试技术

Theoretical characterization of the adsorption configuration of pyrrole on Si(100)surface by x-ray spectroscopy

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Chinese Physics B 2024年第2期33卷 430-435页

作者：李好情明静姜志昂李海波马勇宋秀能 School of Physics and Electronics Shandong Normal UniversityJinan 250358China

The possible configurations of pyrrole absorbed on a Si(100)surface have been investigated by x-ray photoelectron spectroscopy(XPS)and near-edge x-ray absorption fine structure(NEXAFS)*** C-1s XPS and NEXAFS spectra of these adsorption configurations have been calculated by using the density functional theory(DFT)method and fullcore hole(FCH)approximation to investigate the relationship between the adsorption configurations and the *** result shows that the XPS and NEXAFS spectra are structurally dependent on the configurations of pyrrole absorbed on the Si(100)*** with the XPS,the NEXAFS spectra are relatively sensitive to the adsorption configurations and can accurately identify *** NEXAFS decomposition spectra produced by non-equivalent carbon atoms have also been calculated and show that the spectral features vary with the diverse types of carbon atoms and their structural environments.

关键词： pyrrole silicon surface x-ray photoelectron spectroscopy(XPS) near-edge x-ray absorption fine structure(NEXAFS)

Effect of pyrite content on chalcopyrite flotation under different regrinding conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 49-57页

作者： Zejun Wang qing Shi Guofan Zhang Yuxuan Zhu Binbin li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

This study aimed to investigate the effect of varying pyrite(Py)content on copper(Cu)in the presence of different regrinding conditions,which were altered using different types of grinding media:iron,ceramic balls,and their mixture,followed by flotation in the cleaner *** flotation performance of rough Cu concentrate can be improved by changing the regrinding conditions based on the Py *** electron microscopy,X-ray spectrometry,ethylenediaminetetraacetic acid disodium salt extraction,and X-ray photoelectron spectroscopy studies illustrated that when the Py content was high,the use of iron media in regrinding promoted the generation of hydrophilic Fe OOH on the surface of Py and improved the Cu *** ceramic medium with a low Py content prevented excessive Fe OOH from covering the surface of chalcopyrite(Cpy).Electrochemical studies further showed that the galvanic corrosion current of Cpy-Py increased with the addition of Py and became stronger with the participation of iron media.

关键词： chalcopyrite regrinding media pyrite galvanic corrosion flotation

Laser‑Induced Highly Stable Conductive Hydrogels for Robust Bioelectronics

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Nano-Micro Letters 2025年第3期17卷 117-120页

作者： Yibo li hao Zhou Huayong Yang Kaichen Xu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310058People’s Republic of China

Despite the promising progress in conductive hydrogels made with pure conducting polymer,great challenges remain in the interface adhesion and robustness in longterm *** address these challenges,*** Hwan Ko and Taek-Soo Kim’s team introduced a laserinduced phase separation and adhesion method for fabricating conductive hydrogels consisting of pure poly(3,4-ethylenedioxythiophene):polystyrene sulfonate on polymer *** laser-induced phase separation and adhesion treated conducting polymers can be selectively transformed into conductive hydrogels that exhibit wet conductivities of 101.4 S cm^(−1)with a spatial resolution down to 5μ***,they maintain impedance and charge-storage capacity even after 1 h of *** micropatterned electrode arrays demonstrate their potential in long-term in vivo signal recordings,highlighting their promising role in the field of bioelectronics.

关键词： Laser processing Conductive hydrogels Stable interface Bio-interfacing electrodes Bioelectronic application