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Chunyi Cui,Chunyang Yu,Jiuye Zhao,Jun-jie Zheng 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9
Although amounts of steel slag are left as waste, advances in treatment technologies have made steel slag a potential low-carbon supplementary cementitious material. Replacing cement with steel slag will drastically reduce carbon footprint, especially, in the engineering field where there are efforts to improve the geological properties of soft soil using cement-based cementitious materials. However, the influence of the degree of fineness, precarbonation treatment, and substitution ratio of steel slag on the mechanical properties of stabilized soils with a cement–steel slag blend and the corresponding influence mechanism are still unclear. Herein, four types of steel slag powders (i.e., coarse steel slag (CSS), fine steel slag (FSS), fine steel slag under precarbonation treatment for 2 h (FSS-C-2h), and fine steel slag under precarbonation treatment for 18 h (FSS-C-18h)) were prepared in a laboratory and used as a substitute to cement at ratios of 10%, 20%, 30%, and 50%. Tests were conducted to evaluate the strength and performance of the cement–steel slag blend stabilized soils (SCSs), and the changes in the phase and morphology of the hydration products were observed. The results showed that the SCS with 10% FSS-C-18h had the highest unconfined compressive strength after curing for 60 d at 110% of stabilized soil with pure cement. The SCSs with CSS and FSS showed no expansion failure during the continuous boiling test over 60 d. The main hydration products for the SCSs were C–S–H and ettringite. Concerning long-term strength and stability, FSS-C-18h at a substitution ratio of 10% or 20% is recommended for achieving green and low-carbon stabilized soils.
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Chunyi Guo,Chengyong Zhao,Maolan Peng,Wei Liu 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5
A hybrid HVDC system that is composed of line commutated converter (LCC) at the rectifier side and voltage source converter (VSC) in series with LCC at the inverter side is studied in this paper. The start-up strategy, DC fault ride-through capability, and fault recovery strategy for the hybrid HVDC system are proposed. The steady state and dynamic performances under start-up, AC fault, and DC fault scenarios are analyzed based on a bipolar hybrid HVDC system. Furthermore, the immunity of the LCC inverter in hybrid HVDC to commutation failure is investigated. The simulation results in PSCAD/EMTDC show that the hybrid HVDC system exhibits favorable steady state and dynamic performances, in particular, low susceptibility to commutation failure, excellent DC fault ride-through, and fast fault recovery capability. Results also indicate that the hybrid HVDC system can be a good alternative for large-capacity power transmission over a long distance by overhead line.
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A Synchronization Technique for Transmissions of Utilizing 4-ary Elliptical Phase Shift Keying
Chunyi SONG,Shigeru SHIMAMOTO 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.4
Based on assumption of perfect synchronization, a scheme defined as 4-ary Elliptical Phase Shift Keying (4-EPSK) has shown advantage over QPSK on noise performance. However, the analysis also shows that performance of 4-EPSK is vulnerable to synchronization errors. To realize efficient signal detection and simplicity of receiver, in this paper, we propose a timing recovery algorithm for 4-EPSK transmission by employing envelope characteristics of 4-EPSK signal. The proposed technique realizes estimation and recovery of time offset through self-processing envelope of the received signal. The evaluation results demonstrate that the proposed technique is effective when time offset of a received 4-EPSK signal is smaller than half symbol duration.
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Lu Chunyi,Yang Tianyuan,Zhang Yiwu,Miao Xingchen,Jin Cong,Xu Xiaoyong 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.3
Plant laccases are copper-containing glycoproteins oxidizing monolignol, which is a key regulator for lignin polymerization and deposition in plant cell walls. In plants, the LAC gene family has been identifed and functionally characterized in Arabi�dopsis, rice, and other plant species. Whereas, no systematic analysis of LAC genes was explored in pear (Pyrus bretschnei�deri), especially their biological roles in stress responses. In this study, a total of 40 P. bretschneideri LACs (PbLACs) were identifed from the pear genome, among which 32 PbLACs members were distributed on 14 chromosomes, and 8 PbLACs were mapped onto scafold contigs. Subsequently, the chromosome localizations, gene structures, conserved domains, gene duplication were analyzed comprehensively and bioinformatically. Phylogenetic analysis demonstrated that the PbLACs were classifed into seven groups. Synteny analysis exhibited that whole-genome duplication (WGD)/segmental duplication was essential for the expansion of PbLAC family. In detail, the 26 PbLACs duplicated gene pairs were taken place at the two WGD events. Further, our results showed that purifying selection presented as the primary force to drive the evolution of PbLACs. Notably, the transcriptomic data were used for exploring the biological roles of PbLACs in response to abiotic stresses (cold, drought, and salt) in pear. We found that the expression of certain PbLACs was signifcantly induced by drought, cold or salt treatments, suggesting that these PbLACs are potentially key genes for further functional characterization in pear in the future. Taken together, our results not only contribute to an enhanced understanding of the evolutional complexity of PbLAC gene family but also provide a good platform for functional studies of PbLAC genes in response to various abiotic stresses.
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Cui, Chunyi,Zhang, Shiping,Chapman, David,Meng, Kun Techno-Press 2018 Geomechanics & engineering Vol.15 No.2
Based on the theory of porous media, an interaction system of a floating pile and a saturated soil in cylindrical coordinates subjected to vertical harmonic load is presented in this paper. The surrounding soil is separated into two distinct layers. The upper soil layer above the level of pile base is described as a saturated viscoelastic medium and the lower soil layer is idealized as equivalent spring-dashpot elements with complex stiffness. Considering the cylindrically symmetry and the pile-soil compatibility condition of the interaction system, a frequency-domain analytical solution for dynamic impedance of the floating pile embedded in saturated viscoelastic soil is also derived, and reduced to verify it with existing solutions. An extensive parametric analysis has been conducted to reveal the effects of the impedance of the lower soil base, the interaction coefficient and the damping coefficient of the saturated viscoelastic soil layer on the vertical vibration of the pile-soil interaction system. It is shown that the vertical dynamic impedance of the floating pile significantly depends on the real stiffness of the impedance of the lower soil base, but is less sensitive to its dynamic damping variation; the behavior of the pile in poro-visco-elastic soils is totally different with that in single-phase elastic soils due to the existence of pore liquid; the effect of the interaction coefficient of solid and liquid on the pile-soil system is limited.
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Guo, Chunyi,Zhao, Chengyong,Peng, Maolan,Liu, Wei The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.5
A hybrid HVDC system that is composed of line commutated converter (LCC) at the rectifier side and voltage source converter (VSC) in series with LCC at the inverter side is studied in this paper. The start-up strategy, DC fault ride-through capability, and fault recovery strategy for the hybrid HVDC system are proposed. The steady state and dynamic performances under start-up, AC fault, and DC fault scenarios are analyzed based on a bipolar hybrid HVDC system. Furthermore, the immunity of the LCC inverter in hybrid HVDC to commutation failure is investigated. The simulation results in PSCAD/EMTDC show that the hybrid HVDC system exhibits favorable steady state and dynamic performances, in particular, low susceptibility to commutation failure, excellent DC fault ride-through, and fast fault recovery capability. Results also indicate that the hybrid HVDC system can be a good alternative for large-capacity power transmission over a long distance byoverhead line.
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On a Class of Analytic Functions Related to the Starlike Functions
Gao, Chunyi,Zhou, Shiqiong Department of Mathematics 2005 Kyungpook mathematical journal Vol.45 No.1
In this paper we discuss a class of analytic functions related to the starlike functions in the unit disk. We prove that this class belongs to the class of close-to-convex functions, we obtain the sharp coefficient upper bounds and distortion theorem of this class, we also get the convexity radius of this class.
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Haowen Xue,Chunyi Hu,Haoyuan Ma,Yanhao Song,Kunru Zhu,Jingfeng Fu,Biying Mu,Xu Gao 대한수의학회 2023 Journal of Veterinary Science Vol.24 No.2
Background: Feline panleukopenia virus (FPV) is a widespread and highly infectious pathogen in cats with a high mortality rate. Although Yanji has a developed cat breeding industry, the variation of FPV locally is still unclear. Objectives: This study aimed to isolate and investigate the epidemiology of FPV in Yanji between 2021 and 2022. Methods: A strain of FPV was isolated from F81 cells. Cats suspected of FPV infection (n = 80) between 2021 and 2022 from Yanji were enrolled in this study. The capsid protein 2 (VP2) of FPV was amplified. It was cloned into the pMD-19T vector and transformed into a competent Escherichia coli strain. The positive colonies were analyzed via VP2 Sanger sequencing. A phylogenetic analysis based on a VP2 coding sequence was performed to identify the genetic relationships between the strains. Results: An FPV strain named YBYJ-1 was successfully isolated. The virus diameter was approximately 20–24 nm, 50% tissue culture infectious dose = 1 × 10−4.94/mL, which caused cytopathic effect in F81 cells. The epidemiological survey from 2021 to 2022 showed that 27 of the 80 samples were FPV-positive. Additionally, three strains positive for CPV-2c were unexpectedly found. Phylogenetic analysis showed that most of the 27 FPV strains belonged to the same group, and no mutations were found in the critical amino acids. Conclusions: A local FPV strain named YBYJ-1 was successfully isolated. There was no critical mutation in FPV in Yanji, but some cases with CPV-2c infected cats were identified.
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