Search

Your search keyword '"Xu, Hengheng"' showing total 11 results
Start Over Author "Xu, Hengheng" Search Limiters Full Text
11 results on '"Xu, Hengheng"'

1. Altered local gyrification and functional connectivity in type 2 diabetes mellitus patients with mild cognitive impairment: A pilot cross-sectional small-scale single center study

Author

Shao, Pengfei, primary, Li, Xin, additional, Qin, Ruomeng, additional, Xu, Hengheng, additional, Sheng, Xiaoning, additional, Huang, Lili, additional, Ma, Junyi, additional, Cheng, Yue, additional, Chen, Haifeng, additional, Zhang, Bing, additional, Zhao, Hui, additional, and Xu, Yun, additional

Published
2022
Full Text
View/download PDF

2. Sustainable recycling for epitaxial growth of YBa2Cu3O7−δ cryomagnets: From discarded buffer-crystals to superior seeds.

Author

Zhu, Yanhan, Xu, Hengheng, Yang, Jinlong, Gao, Qiang, Gu, Xiafan, Wang, Xuechun, Zhou, Difan, and Yao, Xin

Subjects
*EPITAXY, *SECONDARY ion mass spectrometry, *RARE earth metals, *DIFFERENTIAL scanning calorimetry, *SEEDS
Abstract

REBa 2 Cu 3 O 7−δ (REBCO, RE = rare earth elements) cryomagnets have considerable potential for magnetic applications due to their high field trapping capacities over 10 T at temperatures below 77 K. The controlled nucleation of REBCO crystals for attaining superior performance decisively relies on the seeding strategy related to seed material and seeding assembly. Recently, buffer-assisted seeding approaches have been developed for reliable growth, in which buffer-crystals are by-products and discarded after splitting off from main crystals as ceramic waste though containing certain expensive matters such as RE, Ag and Pt. Here, for the first time, we succeeded in utilizing YBCO and NdBCO/Ag buffer-crystals as seeds for producing REBCO crystals under maximum processing temperatures of 1015 ℃ and 1053 ℃, respectively. YBCO specimens were characterized by differential scanning calorimetry and secondary ion mass spectrometry. It was verified that the buffer-crystal was 5.5 K higher than the normal-crystal in peritectic temperature (T p). Furthermore, the highly distributed Mg element was identified in the upper middle part of buffer-crystal, which was diffused from the Mg-involved NdBCO seed in previous fabrication. It is the Mg existence that enhanced T p of the buffer-crystal and made it highly thermal stable in seeding YBCO growth. In contrast to expensive commercial film-seeds and multistep home-prepared crystal-seeds, buffer-crystal-seeds distinctively have cost- and time-saving benefits. Most importantly, the current success adds new value of reusability to buffer-assisted seeding approaches towards a sustainable fabrication of REBCO cryomagnets. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

6. Effects of cognitive reserve proxies on cognitive function and frontoparietal control network in subjects with white matter hyperintensities: A cross‐sectional functional magnetic resonance imaging study

Author

Ye, Qing, primary, Zhu, Huahong, additional, Chen, Huiping, additional, Liu, Renyuan, additional, Huang, Lili, additional, Chen, Haifeng, additional, Cheng, Yue, additional, Qin, Ruomeng, additional, Shao, Pengfei, additional, Xu, Hengheng, additional, Ma, Junyi, additional, and Xu, Yun, additional

Published
2022
Full Text
View/download PDF

9. Early Segmental White Matter Fascicle Microstructural Damage Predicts the Corresponding Cognitive Domain Impairment in Cerebral Small Vessel Disease Patients by Automated Fiber Quantification

Author

Huang, Lili, primary, Chen, Xin, additional, Sun, Wenshan, additional, Chen, Haifeng, additional, Ye, Qing, additional, Yang, Dan, additional, Li, Mengchun, additional, Luo, Caimei, additional, Ma, Junyi, additional, Shao, Pengfei, additional, Xu, Hengheng, additional, Zhang, Bing, additional, Zhu, Xiaolei, additional, and Xu, Yun, additional

Published
2021
Full Text
View/download PDF

11. YBCO-buffered NdBCO film with higher thermal stability in seeding REBCO Growth

Author

Ling Cheng, Xin Yao, Xu Hengheng, D. J. Yu, Yu Chen, and Shibin Yan

Subjects
Superconductivity, Materials science, Condensed matter physics, Condensed Matter - Superconductivity, Metals and Alloys, Nucleation, FOS: Physical sciences, Substrate (electronics), Pole figure, Condensed Matter Physics, Superconductivity (cond-mat.supr-con), Crystallinity, Materials Chemistry, Ceramics and Composites, Thermal stability, 82d55, Electrical and Electronic Engineering, Composite material, Thin film, Layer (electronics)
Abstract

In this work, we report a strengthened superheating effect caused by a buffering YBa2Cu3Oy (Y123 or YBCO) layer in the Nd1+xBa2-xCu3O7-y (Nd123 or NdBCO) thin film with MgO substrate (i.e., NdBCO/YBCO/MgO thin film). In the cold-seeding melt-textured (MT) growth, the NdBCO/YBCO/MgO film presented an even higher superheating level, about 20 {\deg}C higher than that of non-buffered NdBCO film (i.e., NdBCO/MgO film). Using this NdBCO/YBCO/MgO film as seeds and undergoing a maximum processing temperature (Tmax) up to 1120 {\deg}C, we succeeded in growing various RE1+xBa2-xCu3O7-y (REBCO, RE=rare elements) bulk superconductors, including Gd1+xBa2-xCu3O7-y (GdBCO), Sm1+xBa2-xCu3O7-y (SmBCO) and NdBCO that have high peritectic temperatures (Tp). The pole figure (X-Ray \phi-scan) measurement reveals that the NdBCO/YBCO/MgO film has better in-plane alignment than the NdBCO/MgO film, indicating that the induced intermediate layer improves the crystallinity of the NdBCO film, which could be the main origin of the enhanced thermal stability. In short, possessing higher thermal stability and enduring a higher Tmax in the MT process, the NdBCO/YBCO/MgO film is beneficial to the growth of bulk superconductors in two aspects: (1) broad application for high-Tp REBCO materials; (2) effective suppression against heterogeneous nucleation, which is of great assistance in growing large and high-performance REBCO crystals., Comment: 9 pages, 4 figures

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results