Search

Your search keyword '"Tian, Mengyuan"' showing total 154 results
Start Over Author "Tian, Mengyuan"
154 results on '"Tian, Mengyuan"'

2. Study of high temperature superconducting tapes for applications in high-field magnets and power systems

Author

Tian, Mengyuan and Coombs, Timothy

Subjects
AC loss, high temperature superconductor, HTS cables, Superconducting tapes
Abstract

Nowadays, the application of fusion in achieving large-scale, sustainable and carbon-free form of energy is urgently needed. In the design of fusion machines, the construction of superconducting magnets with high field and low inductance is very important. This requires superconducting magnets to be able to carry very high current even with a small conductor curvature (less than 50 mm in some special cases). Due to the high current density and high tolerance to axial tensile and compressive strain of RE − Ba2Cu3O7−σ (REBCO) coated conductors, the CORC® cable is designed as a powerful superconducting cable wound with REBCO coated conductor tapes in multiple layers which can meet these challenging requirements. The Conductor on Round Core (CORC) cable is one important type of superconducting cabling concept which is capable of high current densities. The special structure of CORC cable determines that it is a high-performance, practical and robust conductor with mechanical and electrical isotropy, which is suitable for high-field magnets and compact superconducting power cables. Although it has these advantages, further optimization and research of CORC cable is critical to push its technology to higher performance levels. The spiral geometry of CORC and high aspect ratio of superconducting tapes form challenges for exploring its electromagnetic characteristics, such as current density distribution, AC loss and magnetic field shielding effect. This study is therefore set out to investigate the electromagnetic characteristics of CORC cables by providing comprehensive analyses through experiments and multi-layer numerical models. The main contribution of this thesis is its unique and innovative approach of a new two-dimensional (2D) simulation model, which is applied for the first time to model CORC cables with real spiral structure. In addition, the application of deep-learning neural network into AC loss calculation of CORC cables sets the first attempt to calculate the loss using a statistical method. The simulation and statistical models proposed in the thesis are verified by experimental results. A systematic understanding of how the winding angle, diameter of core, number of superconducting layers and the external applied field influence the electromagnetic behaviour of CORC cables is presented. First of all, a novel 2-D simulation method which can dramatically reduce the simulation time without loss of accuracy has been proposed. The simulation results are summarized and discussed based on both H-formulation and T-A formulation under changing magnetic fields and transport currents. Both models have been validated by experimental measurements, proving their feasibility for quickly calculating the AC loss of CORC cables. Furthermore, this newly proposed 2-D method is able to model the rotating structure of CORC while saving calculation time and simulating the magnetic field shielding effect. This simplified model can also be applied to study the electromagnetic performance of other HTS applications with similar geometries where the traditional 2-D or 2-D axisymmetric models are not applicable. Secondly, a comprehensive comparison of CORC cables up to four layers is presented, which have been modelled using both T-A formulation and H-formulation in three-dimensional (3-D) coordinates. The computation efficiency, magnetization loss, current density and mag- netic flux distribution are studied and compared. The AC loss study of CORC cables with different thicknesses of superconducting layers and with or without copper former has been conducted in order to understand how the AC loss changes when the magnitude and frequency of applied external fields vary. The simulation data and the results gained from experiments show a great agreement, demonstrating that the 3D CORC cable model is accurate and reliable. Next, based on the data obtained from the simulations done in the previous chapters, this thesis has conducted regression analysis using a variety of machine learning methods, and has shown that the AC loss of a spiral structured CORC cable can be accurately and quickly calculated through deep-learning neural network. This provides a new approach for future AC loss calculations and a compelling design approach for industrial applications such as HTS magnets. Typical design considerations, including airgap, the amplitude of the external magnetic field, winding angle and the number of layers, which have covered the typical design considerations, have been investigated. Finally, high-temperature superconducting capacitors are investigated using simulation method to test its performance in a superconducting wireless power transfer system. In particular, the component simulation models of capacitor and coil have been developed using finite element simulation. This process verified that the transfer efficiency is highest when we use the HTS coil together with HTS capacitor instead of traditional components.

Published
2023
Full Text
View/download PDF

4. The Effect of Intrinsic Motivation and Environmental Cues on Social Creativity

Author

Ma, Xiaoqing, Bie, Zhi, Li, Chun, Gu, Chuanhua, Li, Qianqian, Tan, Yuanyuan, Tian, MengYuan, and Fan, Cuiying

Abstract

Motivation is key to the generation of creative ideas, intrinsic motivation is the core driving force of creativity. Researchers believe that individuals with higher intrinsic motivation will produce higher novelty and flexibility. Creativity may also be influenced by environmental cues, which are objects in the environment that individuals can use to solve problems. This study investigated the influence of intrinsic motivation and environmental cues on social creativity and whether there is an interaction effect of intrinsic motivation and environmental cues on the process of electronic brainstorming (EBS). The results showed that individuals generated more ideas (both in quantity and type) when presented with more cues. In this process, the influence of the number of cues on the fluency and flexibility of social creativity was regulated by intrinsic motivation. The more novel the cues, the higher the overall level of originality of the ideas generated by participants. In this process, the influence of the novelty of cues on the effectiveness and fluency of social creativity was regulated by intrinsic motivation. This study offers a fresh theoretical perspective on the complicated relationship between intrinsic motivation and creativity. Furthermore, it provides empirical evidence to inform training on social creativity for university students.

Published
2023
Full Text
View/download PDF

30. Genomics assisted functional characterization of Bacillus velezensis E as a biocontrol and growth promoting bacterium for lily

Author

Li, Bingyu, primary, Wan, Junyi, additional, Sha, Jingjing, additional, Tian, Mengyuan, additional, Wang, Mengchen, additional, Zhang, Xinyuan, additional, Sun, Wei, additional, Mao, Yanrong, additional, Min, Jie, additional, Qin, Yiyuan, additional, Liu, Yuqing, additional, Wang, Wenhe, additional, and He, Xiangfeng, additional

Published
2022
Full Text
View/download PDF

36. sj-docx-1-chl-10.1177_17475198231164370 – Supplemental material for A microwave-assisted and efficient reduction protocol for the synthesis of alkyl-substituted [2.2]-paracyclophanes

Author

Tian, Mengyuan, Zhang, Lixiang, Gao, Lijing, and Xiao, Guomin

Subjects
FOS: Materials engineering, 91299 Materials Engineering not elsewhere classified
Abstract

Supplemental material, sj-docx-1-chl-10.1177_17475198231164370 for A microwave-assisted and efficient reduction protocol for the synthesis of alkyl-substituted [2.2]-paracyclophanes by Mengyuan Tian, Lixiang Zhang, Lijing Gao and Guomin Xiao in Journal of Chemical Research

Published
2023
Full Text
View/download PDF

37. Combination effect between gut microbiota and traditional potentially modifiable risk factors for first-ever ischemic stroke in Tujia, Miao and Han populations in China

Author

Zhang, Na, primary, Wang, Haoren, additional, Wang, Xiaolei, additional, Tian, Mengyuan, additional, Tian, Yong, additional, Li, Qi, additional, Liang, Chengcai, additional, Peng, Xiaowei, additional, Ding, Jian, additional, Wu, Xinrui, additional, and Tan, Hongzhuan, additional

Published
2022
Full Text
View/download PDF

38. Natural Cross-Kingdom Spread of Apple Scar Skin Viroid from Apple Trees to Fungi

Author

Tian, Mengyuan, Wei, Shuang, Bian, Ruiling, Luo, Jingxian, Khan, Haris Ahmed, Tai, Huanhuan, Kondo, Hideki, Hadidi, Ahmed, Andika, Ida Bagus, Sun, Liying, Tian, Mengyuan, Wei, Shuang, Bian, Ruiling, Luo, Jingxian, Khan, Haris Ahmed, Tai, Huanhuan, Kondo, Hideki, Hadidi, Ahmed, Andika, Ida Bagus, and Sun, Liying

Abstract

Viroids are the smallest known infectious agents that are thought to only infect plants. Here, we reveal that several species of plant pathogenic fungi that were isolated from apple trees infected with apple scar skin viroid (ASSVd) carried ASSVd naturally. This finding indicates the spread of viroids to fungi under natural conditions and further suggests the possible existence of mycoviroids in nature. A total of 117 fungal isolates were isolated from ASSVd-infected apple trees, with the majority (85.5%) being an ascomycete Alternaria alternata and the remaining isolates being other plant-pathogenic or -endophytic fungi. Out of the examined samples, viroids were detected in 81 isolates (69.2%) including A. alternata as well as other fungal species. The phenotypic comparison of ASSVd-free specimens developed by single-spore isolation and ASSVd-infected fungal isogenic lines showed that ASSVd affected the growth and pathogenicity of certain fungal species. ASSVd confers hypovirulence on ascomycete Epicoccum nigrum. The mycobiome analysis of apple tree-associated fungi showed that ASSVd infection did not generally affect the diversity and structure of fungal communities but specifically increased the abundance of Alternaria species. Taken together, these data reveal the occurrence of the natural spread of viroids to plants; additionally, as an integral component of the ecosystem, viroids may affect the abundance of certain fungal species in plants. Moreover, this study provides further evidence that viroid infection could induce symptoms in certain filamentous fungi.

Published
2022

41. Field Cancelling Effect in Double-layer Roebel Tapes

Author

Hao, Luning, primary, Patel, Ismail, additional, Yang, Jiabin, additional, Hu, Jintao, additional, Shah, Adil, additional, Wei, Haigening, additional, Tian, Mengyuan, additional, Wang, Qi, additional, Shen, Boyang, additional, and Coombs, Tim A, additional

Published
2022
Full Text
View/download PDF

49. Numerical Study on AC Loss Characteristics of Conductor on Round Core Cables Under Transport Current and Magnetic Field

Author

Yang, Jiabin, primary, Tian, Mengyuan, additional, Ma, Jun, additional, Ozturk, Yavuz, additional, Li, Chao, additional, Hu, Jintao, additional, Gawith, James, additional, Shah, Adil, additional, Patel, Ismail, additional, Wei, Haigening, additional, Hao, Luning, additional, Shen, Boyang, additional, and Coombs, Tim, additional

Published
2021
Full Text
View/download PDF

50. Quench Protection Modeling of an HTS Magnet for MRI System

Author

Shen, Boyang, primary, Chen, Xiao yuan, additional, Liu, Huajun, additional, Ni, Zhipeng, additional, Shi, Yi, additional, Guo, Liang, additional, Zhang, Xintao, additional, Sheng, Jie, additional, Xie, Qi, additional, Zeng, Lei, additional, Chen, Wei, additional, Yang, Xinsheng, additional, Ozturk, Yavuz, additional, Fu, Lin, additional, Tian, Mengyuan, additional, Yang, Jiabin, additional, and Coombs, Tim, additional

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results