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ON THREE SPECTRAL REGULARIZATION METHODS FOR A BACKWARD HEAT CONDUCTION PROBLEM
Xiong, Xiang-Tuan,Fu, Chu-Li,Qian, Zhi Korean Mathematical Society 2007 대한수학회지 Vol.44 No.6
We introduce three spectral regularization methods for solving a backward heat conduction problem (BHCP). For the three spectral regularization methods, we give the stability error estimates with optimal order under an a-priori and an a-posteriori regularization parameter choice rule. Numerical results show that our theoretical results are effective.
Ming-Xiang Xiong,Guangming Chen,Yue-Ling Long,Hairui Cui,Yaoming Liu 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.2
Recycled aggregate concrete (RAC) is rarely used in load-carrying structural members. To widen its structural application, the compressive behavior of a promising type of composite column, steel-fiber reinforced polymer (FRP) doubletube confined RAC column, has been experimentally and analytically investigated in this study. The objectives are the different performance of such columns from their counterparts using natural aggregate concrete (NAC) and the different mechanisms of the double-tube and single-tube confined concrete. The single-tube confined concrete refers to that in concrete-filled steel tubular (CFST) columns and concrete-filled FRP tubular (CFFT) columns. The test results showed that the use of recycled coarse aggregates (RCA) affected the axial load-strain response in terms of deformation capacity but such effect could be eliminated with the increasing confinement. The composite effect can be triggered by the double confinement of the steel and carbon FRP (CFRP) tubes but not by the steel and polyethylene terephthalate (PET) FRP tubes. The proposed analysis-oriented stress-strain model is capable to capture the load-deformation history of such steel-FRP double-tube confined concrete columns under axial compression.
Jingang Xiong,Moqiang Xiong,Youquan Liu,Xiang Li,Shujun Hu 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
A novel self-centering frame with Y-eccentrically braced structure (SC-YEBFs) has been proposed in this paper to solve the problem that the storey drift of structure may exceed the specified limit in standards when self-centering beam-column joints are applied in high-rise and larger spans buildings, and the SC-YEBFs not only has the self-centering performance of self-centering frame system, but also has the high lateral stiffness and energy dissipating capacity of Y-Eccentrically braced frame. To study the lateral load behavior and influencing factors of SC-YEBFs, cyclic loading tests of two scaled specimens of SC-YEBFs substructure (SCS) were conducted, and seven finite element models corrected by the experiment were established to perform parametric analysis. The experiment and finite element analysis results indicated that the shear link has greatly increased the lateral stiffness and energy dissipating capacity of the self-centering structure, at the same time, it has maintained a good self-centering performance and replace ability. With an increase in the cross-sectional area and initial prestress of post-tensioned steel strands, the lateral load capacity and self-centering performance can be improved. The self-centering performance can be effectively improved by reducing the friction coefficient at the rotation connections. SC-YEBFs further extending the application field of self-centering structural systems, and making it possible to be applied to high-rise and larger spans structures.
The Effect of K-Ion on the Electrochemical Performance of Spinel LiMn2O4
Lilong Xiong,Youlong Xu,Xiang Xiao,Jie Wang,Yutao Li 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Spinel LiMn2O4 is regarded as one of the cathode active materials for rechargeablelithium-ion batteries with the most potential. K+-ion modified LiMn2O4 samples aresynthesized by solid-state reaction. The SEM analysis shows that the modifiedsamples exhibit uniform particle size distribution and much better crystallinity. Themodified sample K1 exhibits ionic diffusion coefficient of 1.43 × 10−10 cm−2 s−1 and2.04 × 10−10 cm−2 s−1, which is much higher than that of the un-modified spinelLiMn2O4 sample. The electrochemical measurements show that K+-ion modificationcould effectively reduce the charge transfer resistance, improve the capacityretention and rate capacity of the spinel materials.
Impact of Artificial Intelligence on the Development of Art Projects: Opportunities and Limitations
Zheng, Xiang,Xiong, Jinghao,Cao, Xiaoming,Nazarov, Y.V. International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.9
To date, the use of artificial intelligence has already brought certain results in such areas of art as poetry, painting, and music. The development of AI and its application in the creative process opens up new perspectives, expanding the capabilities of authors and attracting a new audience. The purpose of the article is to analyze the essential, artistic, and technological limitations of AI art. The article discusses the methods of attracting AI to artistic practices, carried out a comparative analysis of the methods of using AI in visual art and in the process of writing music, identified typical features in the creative interaction of the author of a work of art with AI. The basic principles of working with AI have been determined based on the analysis of ways of using AI in visual art and music. The importance of neurobiology mechanisms in the course of working with AI has been determined. The authors conclude that art remains an area in which AI still cannot replace humans, but AI contributes to the further formation of methods for modifying and rethinking the data obtained into innovative art projects.
Chen, Jianxun,Xiong, Xiang Korean Carbon Society 2007 Carbon Letters Vol.8 No.1
The carbon brake discs were manufactured by densification the carbon fiber preform using PG-CVI technology with Propene as a carbon precursor gas and Nitrogen as a carrier gas. The densities of carbon brake discs were tested at different densification time. The results indicate that the densification rate is more rapid before 100 hrs than after 200 hrs. The CTscanning image and the SEM technology were used to observe the inner subtle structure. CT-images show the density distribution in the carbon brake disc clearly. The carbon brake disk made by PG-CVI is not very uniform. There is a density gradient in the bulk. The high-density part in the carbon brake is really located in the friction surface, especially in the part of inner circle. This density distribution is most suitable for the stator disc.