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Zhihong Yang,Bing Li 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.2
As the main lateral load resisting system in high-rise reinforced concrete structures, the mechanical performance of shear wall has a significant impact on the structure, especially for high-rise buildings. Steel corrosion has been recognized as an important factor affecting the mechanical performance and durability of the reinforced concrete structures. To investigate the effect on the seismic behaviour of corroded reinforced concrete shear wall induced by corrosion, analytical investigations and simulations were done to observe the effect of corrosion on the ultimate seismic capacity and drift capacity of shear walls. To ensure the accuracy of the simulation software, several validations were made using both non-corroded and corroded reinforced concrete shear walls based on some test results in previous literature. Thereafter, a parametric study, including 200 FE models, was done to study the influence of some critical parameters on corroded structural shear walls with boundary element. These parameters include corrosion levels, axial force ratio, aspect ratio, and concrete compressive strength. The results obtained would then be used to propose equations to predict the seismic resistance and drift capacity of shear walls with various corrosion levels.
A Method for Determining Optimum Particle Size Distribution Based on Fractal Theory
( Zhihong Zhang ),( Fan Yang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The particle-size distribution is one of fundamental soil physical properties. In this study the fractal theory was applied to describe the distribution of partial size, and the relationship among particle mass, gradation curve of particle size and fractal dimension is determined. According to the principle that the mechanical properties is optimum when the fractal dimension of filler is unique, the method for determining optimum particle size distribution based on fractal theory has been proposed, based on the one-dimensional fractal characteristics of filling integral. The advantage of the presented method is not including unknown parameters, which is available for soil and rock. The indoors consolidation tests in low and high pressures and numerical simulations with the software Power Factor Correction are conducted to testify the validation of presented method. The results show that the proposed method for determining optimum particle size based on fractal theory is prior to the existing methods. The smaller deformations are observed by the proposed method than others. This investigation is suitable for artificial filling to reach the densest state in the practical engineering.
MICROSTRUCTURE AND TRIBOLOGY OF $TiB_2$ AND $TiB_2$-TiN DOUBLE-LAYER COATINGS
Yang, Yunjie,Chen, Lizhi,Zheng, Zhihong,Wang, Xi,Liu, Xianghuai The Korean Vacuum Society 1995 Applied Science and Convergence Technology Vol.4 No.s2
$TiB_2$-TiN double-layer coating have been prepared by ion beam enhanced deposition. AES, XRD, TEM and HRTEM were employed to characterize the $TiB_2$ layer. The microhardness of the coatings was evaluated by an ultra low-load microhardness indenter system, and the tribological behavior was examined by a ball-on-disc tribology wear tester. It was found that in a single titanium diboride layer, the composition is uniform along the depth of the film, and it is mainly composed of nanocrystalline $TiB_2$ with hexagonal structure, which resulted from the ion bombardment during the film growth. The hardness of the $TiB_2$ films increases with increasing ion energy, and approaches a maximum value of the $TiB_2$ films increases with increasing ion energy, and approaches a maximum value of 39 Gpa at ion energy of 85 keV. The tribological property of the TiB2 films is also improved by higher energy of 85keV. The tribological property of the $TiB_2$ films is also improved by higher energy ion beam bombardment. There is no major disparity in the mechanical properties of double-layer $TiB_2$/TiN coatings and TiN/$TiB_2$ coatings. Both show an improved wear resistance compared with single-layer $TiB_2$ films. The adhesion of double-layer coatings is also superior to that of single-layer films.
A Bacillus coagulans and its Application in Pine Pollen Fermentation
Shanyan Yang,Yaoyao Wu,Chubo Luo,Zhihong Di,Yunpeng Wu,Jie Zhang,Yaomei Xu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6
In the study, a potential L-lactic acid-producing bacillus-strain LT1 was isolated. It was identified as Bacillus coagulans based on its morphological, physiological, biochemical properties, and phylogenetic similarity of 16S rDNA. The fermentation conditions of pine pollen by strain LT1 were optimized using Box-Behnken design and response surface methodology. Optimum values of the tested variables for production of viable counts were an inoculum size of 9.22%, temperature= 49.21℃, and an initial pH of 6.82. Under optimized conditions, the viable count was 5.49×109 CFU/mL. Finally, the single factor experiment as preliminary research for fermentation product treatment was performed.
Yin, Zhihong,Zhao, Xin,Wang, Zhun,Li, Zhen,Bai, Rui,Yang, Shanshan,Zhao, Min,Pang, Quanhai Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.10
Guanine nucleotide-binding protein subunit alpha-s ($Gn{\alpha}s$) is a small subunit of the G protein-couple signaling pathway, which is involved in the formation of coat color. The expression level and distribution of $Gn{\alpha}s$ were detected by quantitative real-time-polymerase chain reaction (qPCR), western blot, and immunohistochemistry to investigate the underlying mechanisms of coat color in white and black skin tissues of mice. qPCR and western blot results suggested that $Gn{\alpha}s$ was expressed at significantly higher levels in black mice compared with that of white mice, and transcripts and protein possessed the same expression in both colors. Immunohistochemistry demonstrated $Gn{\alpha}s$ staining in the root sheath and dermal papilla in hair follicle of mice skins. The results indicated that the $Gn{\alpha}s$ gene was expressed in both white and black skin tissues, and the expression level of $Gn{\alpha}s$ in the two types of color was different. Therefore, $Gn{\alpha}s$ may be involved in the coat color formation in mice.
( Shujuan Yang ),( Chenglin Deng ),( Yao Li ),( Weicheng Li ),( Qiong Wu ),( Zhihong Sun ),( Zhenhui Cao ),( Qiuye Lin ) 한국축산학회 2022 한국축산학회지 Vol.64 No.1
Lactiplantibacillus plantarum (L. plantarum) ST was isolated from De’ang pickled tea in Yunnan Province, China. The genomes of strain ST were fully sequenced and analyzed using the PacBio RS II sequencing system. Our previous study has shown that L. plantarum ST is a potential probiotic strain. It had strong tolerance in the simulated artificial gastrointestinal tract, and in the antagonism tests, this strain showed strong antibacterial activity. Therefore, as a probiotic, it may be used in animal breeding. L. plantarum ST genome was composed of 1 circular chromosome and 7 plasmids. The length of the whole genome was 3320817 bp, and the annular chromosome size was 3058984 bp, guanine + cytosine (G ± C) content (%) was 44.76%, which contained 2945 protein-coding sequences (CDS). This study will contribute to a further comprehensive understanding of L. Plantarum ST at the genomic level and provide a theoretical basis for its future application in animal breeding.
Wideband Slow Light in a Line-defect Annular Photonic-crystal Waveguide
Feng Kuang,Feng Li,Zhihong Yang,Hong Wu 한국광학회 2019 Current Optics and Photonics Vol.3 No.5
In this theoretical study, a line-defect photonic-crystal waveguide hosted in an annular photonic crystal was demonstrated to provide high-performance slow light with a wide band, low group-velocity dispersion, and a large normalized delay-bandwidth product. Combined with structural-parameter optimization and selective optofluid injection, the normalized delay-bandwidth product could be enhanced to a large value of 0.502 with a wide bandwidth of 58.4 nm in the optical-communication window, for a silicon-on-insulator structure. In addition, the group-velocity dispersion is on the order of 10 5 (ps 2 /km) in the slow-light region, which could be neglected while keeping the signal transmission unchanged.