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249 results on '"Sun, Youmei"'

6. Fine structure of swift heavy ion track in rutile TiO2

Author

Zhai, Pengfei, Nan, Shuai, Xu, Lijun, Li, Weixing, Li, Zongzhen, Hu, Peipei, Zeng, Jian, Zhang, Shengxia, Sun, Youmei, and Liu, Jie

Subjects
Physics - Applied Physics
Abstract

We report on the first observation of fine structure of latent tracks in rutile TiO2, which changes from cylinder to dumbbell-shape and then to sandglass-shape as a function of the ion path length. Based on inelastic thermal spike model, we show that Hagen-Poiseuille flow of molten phase produces the hillocks on surface and the void-rich zone near surface after epitaxial recrystallization due to material deficit, while at a deep depth, the lack of efficient outflow and recrystallization result in the absence of tracks. We propose that core-shell duration of transient molten phase induced by swift heavy ion and parabolic distribution of fluid velocity are radial-dependent. Moreover, the various morphologies of tracks are a consequence of the molten phase outflow and recrystallization during rapid cooling down. Our perspective provides a new interpretation in the track formation.

Published
2018
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14. Glycogen Quantification and Gender Identification in Di-, Tri-, and Tetraploid Crassostrea gigas Using Portable Near-Infrared Spectroscopy.

Author

Fu, Jingjing, Wang, Weijun, Sun, Youmei, Zhang, Yousen, Luo, Qihao, Wang, Zhongping, Wang, Degang, Feng, Yanwei, Xu, Xiaohui, Cui, Cuiju, Sun, Guohua, Li, Zan, and Yang, Jianmin

Subjects
PACIFIC oysters, NEAR infrared spectroscopy, GLYCOGEN, PLOIDY, SPECTROMETERS
Abstract

Near-infrared spectroscopy (NIR) has become an essential tool for non-destructive analysis in various fields, including aquaculture. This study presents a pioneering application of portable NIR spectrometers to analyze glycogen content in the gonadal tissues of the Pacific oyster (Crassostrea gigas), marking the first instance of developing quantitative models for glycogen in tetraploid C. gigas. The research also provides a comparative analysis with models for diploid and triploid oysters, underscoring the innovative use of portable NIR technology in aquaculture. Two portable NIR spectrometers were employed: the Micro NIR 1700 (908–1676 nm) and the Micro PHAZIR RX (1624–2460 nm). Near-infrared spectra were acquired from the gonadal tissues of diploid, triploid, and tetraploid C. gigas. Quantitative models for glycogen content were developed and validated using cross-validation methods. Additionally, qualitative models for different ploidies and genders were established. For the Micro NIR 1700, the cross-validation correlation coefficients (Rcv) and cross-validation relative predictive errors (RPDcv) for glycogen were 0.949 and 3.191 for diploids, 0.915 and 2.498 for triploids, and 0.902 and 2.310 for tetraploids. The Micro PHAZIR RX achieved Rcv and RPDcv values of 0.781 and 2.240 for diploids, 0.839 and 2.504 for triploids, and 0.717 and 1.851 for tetraploids. The Micro NIR 1700 demonstrated superior quantitative performance, with RPD values exceeding 2, indicating its effectiveness in predicting glycogen content across different ploidy levels. Qualitative models showed a performance index of 91.6 for diploid and 95 for tetraploid genders using the Micro NIR 1700, while the Micro PHAZIR RX achieved correct identification rates of 99.79% and 100% for diploid and tetraploid genders, respectively. However, differentiation of ploidies was less successful with both instruments. This study's originality lies in establishing the first quantitative models for glycogen content in tetraploid C. gigas using portable NIR spectrometers, highlighting the significant advancements in non-destructive glycogen analysis. The applicability of these findings is substantial for oyster breeding programs focused on enhancing meat quality traits. These models provide a valuable phenotyping tool for selecting oysters with optimal glycogen content, demonstrating the practical utility of portable NIR technology in aquaculture. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Fingerprint Analysis of Volatile Flavor Compounds in Crassostrea gigas of Different Ploidy and Gender under High-Temperature Incubation

Author

Sun, Youmei, primary, Fu, Jingjing, additional, Zhang, Enshuo, additional, Dong, Luyao, additional, Cui, Xuebo, additional, Sun, Yanan, additional, Wang, Zhizhong, additional, Feng, Yanwei, additional, Li, Bin, additional, Xu, Xiaohui, additional, Luo, Qihao, additional, Wang, Weijun, additional, and Yang, Jianmin, additional

Published
2023
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39. Analysis of Volatile Compounds and Flavor Fingerprint Using Gas Chromatography–Ion Mobility Spectrometry (GC-IMS) on Crassostrea gigas with Different Ploidy and Gender.

Author

Fu, Jingjing, Sun, Youmei, Cui, Mingxian, Zhang, Enshuo, Dong, Luyao, Wang, Yanchun, Wang, Weijun, Li, Zan, and Yang, Jianmin

Subjects
*PACIFIC oysters, *PLOIDY, *FLAVOR, *PROPIONIC acid, *PRINCIPAL components analysis, *ANISOLE
Abstract

In this study, GC-IMS was used to analyze the volatile component and flavor profiles of Crassostrea gigas individuals of different ploidy and gender. Principal component analysis was used to explore overall differences in flavor profiles, and a total of 54 volatile compounds were identified. The total volatile flavor contents in the edible parts of tetraploid oysters were significantly higher than in diploid and triploid oysters. The concentrations of ethyl (E)-2-butenoate and 1-penten-3-ol were significantly higher in triploid oysters than in diploid and tetraploid oysters. In addition, the volatile compounds propanoic acid, ethyl propanoate, 1-butanol, butanal, and 2-ethyl furan were significantly higher in females than in males. The volatile compounds p-methyl anisole, 3-octanone, 3-octanone, and (E)-2-heptenal were present in higher levels in male than in female oysters. Overall, different ploidy and gender of oysters are connected with different sensory characteristics, providing new insights for understanding the flavor characteristics of oysters. [ABSTRACT FROM AUTHOR]

Published
2023
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45. Direct Fabrication of Sub-10 nm Nanopores in WO3Nanosheets Using Single Swift Heavy Ions

Author

Xu, Lijun, Rymzhanov, Ruslan A., Zhai, Pengfei, Zhang, Shengxia, Hu, Peipei, Meng, Xuan, Zeng, Jian, Sun, Youmei, and Liu, Jie

Abstract

Extending the fabrication methodology of solid-state nanopores in a wide range of materials is significant in the fields of single molecule detection, nanofluidic devices, and nanofiltration membranes. Here, we demonstrate a new method to directly fabricate size- and density-controllable sub-10 nm nanopores in WO3nanosheets using single swift heavy ions (SHIs) without any chemical etching process. By selecting ions of different electronic energy losses (Se), nanopores with sizes from 1.8 to 7.4 nm can be created in WO3nanosheets. The creation efficiency of nanopores achieves ∼100% for Se> 20 keV/nm, and there exists a critical thickness below which nanopores can be created. Combined with molecular dynamics simulations, we propose that the viscosity and surface tension of the transient molten phase caused by SHIs are the key factors for the formation of nanopores. This method paves a way to fabricate solid-state nanopores in materials with a low viscosity and surface tension.

Published
2023
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49. A potential lattice damage scale in swift heavy ion irradiated InP

Author

Hu, Peipei, primary, Zeng, Jian, additional, Zhang, Shengxia, additional, Zhai, Pengfei, additional, Xu, Lijun, additional, Ai, Wensi, additional, Maaz, Khan, additional, Xue, Haizhou, additional, Li, Zongzhen, additional, Sun, Youmei, additional, Liu, Jie, additional, and He, Yuan, additional

Published
2021
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