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Juan Chen,Xuan Liu,Hongwei Liu,Lei Zeng 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.2
This paper presents an experimental work for short circular steel tube columns filled with normal concrete (NAC), recycled aggregate concrete (RAC), and RAC with silica fume and steel fiber. Ten specimens were tested under axial compression to research the effect of silica fume and steel fiber volume percentage on the behavior of recycled aggregate concrete-filled steel tube columns (RACFST). The failure modes, ultimate loads and axial load- strain relationships are presented. The test results indicate that silica fume and steel fiber would not change the failure mode of the RACFST column, but can increase the mechanical performances of the RACFST column because of the filling effect and pozzolanic action of silica fume and the confinement effect of steel fiber. The ultimate load, ductility and energy dissipation capacity of RACFST columns can exceed that of corresponding natural aggregate concrete-filled steel tube (NACFST) column. Design formulas EC4 for the load capacity NACFST and RACFST columns are proposed, and the predictions agree well with the experimental results from this study.
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Juan Hu,Fenghui Dong,Yiqi Qiu,Lei Xi,Ali Majdi,H. Elhosiny Ali 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.2
Proper calculation of splitting tensile strength (STS) of concrete has been a crucial task, due to the wide use of concrete in the construction sector. Following many recent studies that have proposed various predictive models for this aim, this study suggests and tests the functionality of three hybrid models in predicting the STS from the characteristics of the mixture components including cement compressive strength, cement tensile strength, curing age, the maximum size of the crushed stone, stone powder content, sand fine modulus, water to binder ratio, and the ratio of sand. A multi-layer perceptron (MLP) neural network incorporates invasive weed optimization (IWO), cuttlefish optimization algorithm (CFOA), and electrostatic discharge algorithm (ESDA) which are among the newest optimization techniques. A dataset from the earlier literature is used for exploring and extrapolating the STS behavior. The results acquired from several accuracy criteria demonstrated a nice learning capability for all three hybrid models viz. IWO-MLP, CFOA-MLP, and ESDA-MLP. Also in the prediction phase, the prediction products were in a promising agreement (above 88%) with experimental results. However, a comparative look revealed the ESDA-MLP as the most accurate predictor. Considering mean absolute percentage error (MAPE) index, the error of ESDAMLP was 9.05%, while the corresponding value for IWO-MLP and CFOA-MLP was 9.17 and 13.97%, respectively. Since the combination of MLP and ESDA can be an effective tool for optimizing the concrete mixture toward a desirable STS, the last part of this study is dedicated to extracting a predictive formula from this model.
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Juan Du,Lei Liu,Yifeng Yu,Yue Zhang,Aibing Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
A self-assembly method using ionic liquids as soft-template and nitrogen precursor, resin as carbonprecursor, silica as assistant agent, mesoporous resin spheres as additive, is employed to prepare Ndopedcore–shell mesoporous sphere and carbon sheet composite (N-CMCS/CS). The obtained N-CMCS/CS possesses thin sheet, core–shell spheres, dual-mesoporous structure, large specific area and a certainof N-doping, which endows it with superior electrochemical performance as electrode material insupercapacitor.
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An I-V Circuit with Combined Compensation for Infrared Receiver Chip
Lei Tian,Qin-qin Li,Shu-juan Chang 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
This paper proposes a novel combined compensation structure in the infrared receiver chip. For the infrared communication chip, the current-voltage (I-V) convert circuit is crucial and important. The circuit is composed by the transimpedance amplifier (TIA) and the combined compensation structures. The TIA converts the incited photons into photocurrent. In order to amplify the photocurrent and avoid the saturation, the TIA uses the combined compensation circuit. This novel compensation structure has the low frequency compensation and high frequency compensation circuit. The low frequency compensation circuit rejects the low frequency photocurrent in the ambient light preventing the saturation. The high frequency compensation circuit raises the high frequency input impedance preserving the sensitivity to the signal of interest. This circuit was implemented in a 0.6μm BiCMOS process. Simulation of the proposed circuit is carried out in the Cadence software, with the 3V power supply, it achieves a low frequency photocurrent rejection and the gain keeps 109dB ranging from 10nA to 300μA. The test result fits the simulation and all the results exploit the validity of the circuit.
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Numerical Study on the Damage Characteristics of Layered Shale Using 3D DEM
Juan Huang,Yintao Song,Ming-feng Lei,Cheng-hua Shi,Chaojun Jia,Jian Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12
Layered shale is a kind of rock with obvious anisotropy, which is significantly influenced by the inclination angle of the rock. In this study, the influence of bedding dip on the strength characteristics, failure mode, and internal fracture evolution of layered shale was investigated through laboratory triaxial compression tests and three-dimensional discrete element numerical simulations. Results show that the numerical model of layered shale constructed using the bonded block model can simulate the layered shale in terms of U-shaped strength variation and failure modes very well. Based on the distribution of cracks and failure characteristics of layered rocks, the failure modes of layered rocks are classified as follows: Shear failure across the bedding plane, slip failure along bedding planes, combined tensile splitting and shear failure. The development of microcracks damage in the slip failure model is controlled by interlayer joints, while in other failure modes, it is jointly controlled by the rock matrix and interlayer joints. The relationship between microscopic joint parameters and the variations of Young's modulus and peak strength has been proposed.
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Xiao, Juan,Deng, Lei,Yang, Ming-Ge Korean Mathematical Society 2014 대한수학회논문집 Vol.29 No.1
In a uniformly convex Banach space, we introduce a iterative scheme for a finite family of asymptotically quasi-nonexpansive mappings and utilize a new inequality to prove several convergence results for the iterative sequence. The results generalize and unify many important known results of relevant scholars.
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Hui-Juan Teng,Yue Guo,Jian-Qi Wang,Rongjun Li,Ying-Tang Lu,Lei Zhang 한국식물학회 2016 Journal of Plant Biology Vol.59 No.6
CRK5 is a member of the Arabidopsis thaliana Ca2+-dependent protein kinase-related kinase family. Here, a yeast two-hybrid screen was performed with a truncated form of AtCRK5 as bait to identify interacting proteins and determine its physiological roles. One gene encoding the DWD protein WDRP was isolated. Furthermore, in vitro and in vivo co-immunoprecipitation results strongly supported that these two proteins interact with each other. Using a cell-free degradation assay, we also established that CRK5 was an unstable protein that was degraded through the proteasome pathway. The rate of CRK5 degradation was delayed in a WDRP knockout line. On the other hand, the degradation of CRK5 mediated by WDRP might not affect the phosphorylation of PIN2 by CRK5. Overall, we demonstrated that AtCRK5 interacted with a DWD protein, AtWDRP; the protein AtWDRP targets the kinase for ubiquitin-dependent degradation. Therefore, this report describes a new kinase regulation pathway for CRK family proteins in Arabidopsis.
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Liu, Lei,Su, Juan,Xue, Xuanxuan 부산대학교 중국연구소 2023 Journal of China Studies Vol.26 No.3
The digital economy is a series of economic activities that use digital knowledge and information as key factors of production, modern information networks as important carriers, and the effective use of information and communication technology as an important driving force for efficiency improvement and economic structure optimization(Ma et al., 2021). As a new industrial driver, the digital economy has become a new driving force and engine to promote the optimization of industrial structure.Tourism industry as an information-intensive industry has better adaptability with digital economy and has an important role in promoting tourism technology innovation, tourism information sharing and tourism industry integration. However, the tourism industry in the digital transformation of insufficient cognition, low efficiency in the application of digital technology, insufficient construction of digital platforms, the lack of digital talents in the tourism industry and other problems, to a certain extent, weakened the momentum of the digital transformation of the tourism industry. Therefore, it is urgent to study the mechanism path of digital economy on tourism industry structure optimization and effective countermeasures for customer service dilemma. The study results found that: at the theoretical level, the mechanism of digital economy promoting tourism industry structure optimization is analyzed based on economic growth theory and industrial structure theory, and the digital economy transforms tourism industry development mode through integration and innovation effect, improves tourism total factor productivity through factor upgrading effect, and reshapes tourism industry organization form through spatial spillover. At the practical level, the realistic dilemmas of the digital economy empowered tourism industry structure are analyzed, such as "digital divide", "data monopoly", tourism market regulation and tourism platform supervision, etc. In response to those problems, development countermeasures are proposed to innovate the tourism industry model, upgrade the traditional production factors of tourism, and accelerate the spatial clustering and information sharing of the tourism industry. This paper provides a new research perspective and path for the digital transformation and upgrading of tourism industry from the theoretical and practical levels.
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