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Journal of Materials Science & Technology 2020年第16期47卷 137-150页

作者： Huihui Yang Guanyi Jing piao gao Zemin Wang Xiangyou Li Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

The inherent drawbacks of selective laser melting technique including serious micro-pore and element microsegregation problems destroy the mechanical property of the *** overcome this problem,a new approach,circular beam oscillation,was successfully applied in the SLMed Inconel 718 samples including single tracks,thin walls and cuboid *** one hand,circular beam oscillation reduces the micro-pores in molten pools and cuboid samples,increasing the relative density of the cuboid sample to 99.95%.On the other hand,circular beam oscillation suppresses the element microsegregation,reducing the formation of Laves phases in SLMed Inconel 718 ***,circular beam oscillation enhances thetexture of thin walls and thetexture of cuboid *** improvement of formability and microstructure of the SLMed samples with oscillation is closely related to cooling rate,thermal gradient and stirring effect during the solidification ***,circular beam oscillation shows the possibility to overcome the key bottlenecks of the traditional SLM technology and to realize a further industrial application of SLM technology.

关键词： Circular beam oscillation Selective laser melting Inconel 718 Solidification behaviour

Effects of electron beam lithography process parameters on structure of silicon optical waveguide based on SOI

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Journal of Central South University 2022年第10期29卷 3335-3345页

作者： ZHENG Yu gao piao-piao TANG Xin LIU Jian-zhe DUAN Ji-an State Key Laboratory of High Performance Complex Manufacturing(Central South University) Changsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Huangshan Bright Semiconductor Co. LtdHuangshan 245021China

Electron beam lithography(EBL) is a key technology in the fabrication of nanoscale silicon optical waveguide. The influence of exposure dose, the main process parameter of EBL, on the structure profile of poly-methyl methacrylate(PMMA) after development was studied using a silicon on insulator(SOI) wafer with 220 nm top silicon as the substrate. The relationship between exposure dose and structure pattern width after development was analyzed according to the measurement results. The optimum exposure dose of 220 μC/cm^(2) was found to obtain a final structure consistent with the designed mask value through subsequent processes. At the same time, according to the image segmentation curve tracking technology, the contour extraction process of the dose test results was carried out, and the relationship among mask design value, exposure dose and two-dimensional roughness of boundary contour was analyzed, which can provide reference for the subsequent electron beam lithography of the same substrate material.

关键词： silicon optical waveguide electron beam lithography exposure dose roughness

Selective Laser Melting of In Situ TiB/Ti6Al4V Composites: Formability, Microstructure Evolution and Mechanical Performance

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 774-788页

作者： Yue Su Shun-Cun Luo Liang Meng piao gao Ze-Min Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

In the present study, a series of in situ TiB/Ti6Al4V composites were fabricated using selective laser melting. The formability, microstructure evolution and mechanical properties of the as-built samples added with different contents of TiB2 were studied. It is found that the densification level is related to both the content of TiB2 and laser energy density. The added TiB2 reinforcement particle can spontaneously react with titanium and then form the TiB phase. The needle-like TiB phase tends to transform into dot-like particles with the decrease in energy density. Additionally, with the increase in TiB2 content, the TiB phase is coarsened due to the increased nucleation rate and more reactions. The grain morphology is found to largely depend on the translational speed of solid–fluid interface determined by the temperature gradient and cooling rate. Also, the microhardness of the as-built TiB/Ti6Al4V composites is obviously improved. More interestingly, as the energy density increases, the microhardness of the as-built TiB/Ti6Al4V composites firstly increases and then decreases due to the synergy of grain size and different morphologies and distribution of TiB phases. The wear resistance of TiB/Ti6Al4V composites is far superior to that of Ti6Al4V alloy owing to the increased microhardness resulted from the uniform distribution of the hard TiB phase in the matrix.

关键词： Selective laser melting TiB/Ti6Al4V composites Energy density Densification behavior Microhardness Wear resistance

Cracking behavior and control of β-solidifying Ti-40Al-9V-0.5Y alloy produced by selective laser melting

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Journal of Materials Science & Technology 2020年第4期39卷 144-154页

作者： piao gao Wenpu Huang Huihui Yang Guanyi Jing Qi Liu Guoqing Wang Zemin Wang Xiaoyan Zeng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China China Academy of Launch Vehicle Technology Beijing 100076China

Aβ-solidifying Ti-40 Al-9 V-0.5 Y(at.%)alloy with a high cracking sensitivity has been successfully fabricated by selective laser melting(SLM)in this *** influence factors for cracking sensitivity,cracking behavior and crack inhibition mechanism were *** results show that the effects of process parameters on cracking sensitivity strongly depend on the cooling rate in molten pool with different heat transfer *** conduction mode with higher cooling rates exhibits a higher cracking sensitivity in comparison to the keyhole *** characteristics and phase transformations controlled by cooling rate determine the inherent ductility ofβ-solidifyingγ-Ti Al alloys during *** this basis,the formation and inhibition mechanism of solidification and cold cracking are ***,the crackfree Ti-40 Al-9 V-0.5 Y sample with fine equiaxed microstructures and favorable mechanical properties(microhardness of 542±19 HV,yield strength of 1871±12 MPa,ultimate strength of 2106±13 MPa and ultimate compressive strain of 10.89±0.57%)can be produced by *** strengthening mechanism can be attributed to grain refinement and precipitation strengthening.

关键词： Selective laser melting β-solidifyingγ-TiAl alloy Cracking behavior Cracking control Microstructure Phase transformation

Mapping the intellectual structure and emerging trends for the application of nanomaterials in gastric cancer:A bibliometric study

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 2181-2199页

作者： Bo-Na Liu Xiao-Li gao Ying piao Department of Oncology General Hospital of Northern Theater CommandShenyang 110015Liaoning ProvinceChina

BACKGROUND Recent reviews have outlined the main nanomaterials used in relation to gastrointestinal tumors and described the basic properties of these ***,the research hotspots and trends in the application of nanomaterials in gastric cancer(GC)remain *** To demonstrate the knowledge structure and evolutionary trends of research into the application of nanomaterials in *** Publications related to the application of nanomaterials in GC were retrieved from the Web of Science Core Collection for this systematic review and bibliometric *** and CiteSpace were used for bibliometric and visualization *** From 2000 to 2022,the application of nanomaterials in GC developed *** keyword co-occurrence analysis showed that the related research topics were divided into three clusters:(1)The application of nanomaterials in GC treatment;(2)The application and toxicity of nanomaterials in GC diagnosis;and(3)The effects of nanomaterials on the biological behavior of GC ***,silver nanoparticles,and green synthesis are the latest high-frequency keywords that represent promising future research *** The application of nanomaterials in GC diagnosis and treatment and the mechanisms of their effects on GC cells have been major themes in this field over the past 23 years.

关键词： Nanomaterials Gastric cancer Bibliometrics Drug delivery VOSviewer CiteSpace Systematic review

NaFeEDTA Fortified Soy Sauce Showed Higher Iron Absorption Rate in Chinese Females

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Biomedical and Environmental Sciences 2007年第2期20卷 126-130页

作者： JUN-SHENG HUO XIAO-GUANG YANG JIAN-HUA piao JUN-QUAN gao HONG MIAO Bo YU CHENG-QIAN LU JUN-SHI CHEN Institute of Nutrition and Food Safety Chinese Center for Disease Control and Prevention Beijing 100050 China

Objective NaFeEDTA was considered as a promising iron fortificant for controlling iron deficiency anemia. Soy sauce is a suitable food carder for iron fortification and is a popular condiment in China. Iron absorption rates of NaFeEDTA and FeSO4 were observed and compared in adult female subjects. Methods The stable isotope tracer method was used in Chinese females consuming a typical Chinese diet. Ten healthy young Chinese women were selected as subjects in the 15-day study. A plant-based diet was used based on the dietary pattern of adult women in the 1992 National Nutrition Survey. Six milligram of 54Fe in 54FeSO4 soy sauce and 3 mg 5SFe in NaSSFeEDTA soy sauce were given to the same subjects in two days. Food samples and fecal samples were collected and analyzed. Results Iron absorption rates of NaFeEDTA and FeSO4 were 10.51%：~：2.83 and 4.73%＋2.15 respectively. The 5SFe （NaFeEDTA） absorption was significantly higher than that of 54Fe （FeSO4）（P〈0.01）. The iron absorption rate from NaFeEDTA was 1.2 times higher than that from FeSO4 in Chinese adult women consuming a typical Chinese diet. Conclusion The higher absorption rate of NaFeEDTA suggested that NaFeEDTA would be a better iron fortificant used in soy sauce for the controlling of iron deficiency anemia in China.

关键词： NaFeEDTA FeSO4 Iron absorption Stable isotopes Dietary pattern

Rosemary extract improves egg quality by altering gut barrier function,intestinal microbiota and oviductal gene expressions in late-phase laying hens

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Journal of Animal Science and Biotechnology 2024年第1期15卷 295-312页

作者： Lianhua Zhang Junwei Ge Fei gao Min Yang Hui Li Fei Xia Hongtong Bai Xiangshu piao Zhiying Sun Lei Shi Key Laboratory of Plant Resources Institute of BotanyChinese Academy of SciencesBeijing 100093China China National Botanical Garden Beijing 100093China College of Pharmacy Shandong University of Traditional Chinese MedicineJinan 250355China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

Background Rosemary extract(RE)has been reported to exert antioxidant ***,the application of RE in late-phase laying hens on egg quality,intestinal barrier and microbiota,and oviductal function has not been systematically *** study was investigated to detect the potential effects of RE on performance,egg quality,serum parameters,intestinal heath,cecal microbiota and metabolism,and oviductal gene expressions in late-phase laying hens.A total of 21065-week-old“Jing Tint 6”laying hens were randomly allocated into five treatments with six replicates and seven birds per replicate and fed basal diet(CON)or basal diet supplemented with chlortetracycline at 50 mg/kg(CTC)or RE at 50 mg/kg(RE50),100 mg/kg(RE100),and 200 mg/kg(RE200).Results Our results showed that RE200 improved(P<0.05)Haugh unit and n-6/n-3 of egg yolk,serum superoxide dismutase(SOD)compared with *** significant differences were observed for Haugh unit and n-6/n-3 of egg yolk among CTC,RE50,RE100 and RE200 *** with CTC and RE50 groups,RE200 increased serum SOD activity on d 28 and *** with CON,RE supplementation decreased(P<0.05)total cholesterol(TC)***,RE100 and RE200 decreased(P<0.05)serum interleukin-6(IL-6)content compared with *** and RE200 increased jejunal m RNA expression of ZO-1 and Occludin compared with *** biomarkers of cecal microbiota and metabolite induced by RE 200,including Firmicutes,Eisenbergiella,Paraprevotella,Papillibacter,and butyrate,were closely associated with Haugh unit,n-6/n-3,SOD,IL-6,and ***2 analysis indicated that RE altered carbohydrate and amino acid metabolism of cecal microbiota and increased butyrate synthesizing enzymes,including 3-oxoacid Co A-transferase and butyrate-acetoacetate Co ***,transcriptomic analysis revealed that RE200 improved gene expressions and functional pathways related to immunity and albumen formation in the oviductal *** Dietary supplementation with 2

关键词： Intestinal health Laying hens Microbiota Oviductal function Phytochemicals Production

立式稀土氟化炉内温度分布与氟化效率的关系研究

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中国有色冶金 2016年第5期45卷 81-84页

作者：逄启寿郜飘飘徐金江西理工大学机电工程学院江西赣州341000

针对立式稀土氟化炉内各层氟化率差异大的问题,合理简化模型,利用Fluent软件模拟炉内温度总体分布,并将模拟结果与实验结果进行比较,得出入口层温度对氟化效率影响较大,而中上层温度过高对氟化效率的影响并不大。研究结果为合理优化氟... 详细信息

针对立式稀土氟化炉内各层氟化率差异大的问题,合理简化模型,利用Fluent软件模拟炉内温度总体分布,并将模拟结果与实验结果进行比较,得出入口层温度对氟化效率影响较大,而中上层温度过高对氟化效率的影响并不大。研究结果为合理优化氟化炉的加热方式,改善总体温度分布,提高氟化效率等提供理论依据。

关键词：立式稀土氟化炉氟化效率温度场数值模拟

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氟化炉氟化反应过程中气体流场的数值模拟

机械设计与制造 2016年第3期 111-113页

作者：逄启寿邹金萍郜飘飘江西理工大学机电工程学院江西赣州341000

以立式氟化炉的内炉胆为研究对象,通过合理的简化,建立起氟化炉的数学模型,利用ANSYS WORKBENCH软件对氟化炉内的气体在制备稀土过程中氟化反应的流场进行了数值模拟。研究结果表明,现用氟化炉制备稀土时炉胆内气体流速分布差异较大,流... 详细信息

以立式氟化炉的内炉胆为研究对象,通过合理的简化,建立起氟化炉的数学模型,利用ANSYS WORKBENCH软件对氟化炉内的气体在制备稀土过程中氟化反应的流场进行了数值模拟。研究结果表明,现用氟化炉制备稀土时炉胆内气体流速分布差异较大,流场分布呈现不均匀性,并存在气体的回流现象,进出口和中间局部区域出现涡流中心或流动停滞区,易形成氟化反应的"死区",以至于降低了气体氟化效率。仿真分析表明,此模拟结果可为改善炉体结构提供新思路。

关键词：氟化炉氟化反应流场数值模拟

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双层桨搅拌槽的混合过程研究

中国有色冶金 2017年第1期46卷 46-49页

作者：徐金逄启寿郜飘飘罗松江西理工大学机电工程学院江西赣州341000

为了提高双层桨酸溶搅拌槽的混合速率,本文利用数值模拟的方法对双层桨以及改变结构参数后的搅拌桨的混合过程进行了研究。结果表明:桨叶直径、叶片角度、挡板宽度等五个结构参数对混合过程的影响不同,其中桨叶直径的增大能有效缩短混... 详细信息

为了提高双层桨酸溶搅拌槽的混合速率,本文利用数值模拟的方法对双层桨以及改变结构参数后的搅拌桨的混合过程进行了研究。结果表明:桨叶直径、叶片角度、挡板宽度等五个结构参数对混合过程的影响不同,其中桨叶直径的增大能有效缩短混合时间,叶片角度的增加主要影响搅拌槽内的流场流型,挡板宽度对混合过程基本无影响。

关键词：混合过程数值模拟结构参数