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RISS 인기검색어
- 검색키워드
- 저자 : Kaiqiang Li (검색결과 6 건)
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Performance Analysis of Sulfate Pisha-Sandstone Cement Soil Based on the Grey Entropy Theory
Kaiqiang Geng,Xiaoli Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
The exploitation of Pisha sandstone is one of the most significant strategies for environmental protection and resource saving in the border areas of Shanxi, Shaanxi, and Inner Mongolia, where Pisha sandstone is widely distributed. The goal of this research was to develop a method by which to transform Pisha sandstone cement soil into a new type of material which could be applied in saline regions, thereby achieving a wider application. The micro-pore and structural characteristics of cement soil samples which had been soaked in 0.5 mol/L of sodium sulfate solution were analyzed using nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and scanning electron microscopy methods (SEM). The results showed that the compressive strength of the sandstone cement soil decreased with the increase in the sulfate intrusion days. Under the erosion of sodium sulfate solution, the lower the cement content was, the more quickly the strength decreased. The main mineral composition diffraction peaks of sulfate sandstone, along with the diffraction peaks of sulfate corrosion products, tended to change during salt invasion. The mineral components in the sandstone can provide a material basis for the formation of the sulfate erosion products of cement soil. In addition, the grey entropy theory can be utilized to explore the correlation degree of the porosity, T2 spectrum area, bound fluid saturation, free fluid saturation, and unconfined compressive strength of the specimen. The results obtained in this research investigation provided a theoretic basis for the practical engineering applications of Pisha-sandstone cement soil in saline regions.
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Kaiqiang Yu,Li Peng,Wenyu Liang,Jing Shi,Guoqi Zheng,Hong Wang,Xinhua Liang,Shijie Wu 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.1
Licorice from Glycyrrhiza uralensis roots is used in foods and medicines. Although we are aware that licorice roots and leaves have distinct material compositions, the specific reasons for these differences remain unknown. Comparison of the metabolomes and transcriptomes between the leaves and roots revealed flavonoids and triterpenoid saponins were significantly different. Isoflavones were enriched in roots because of upregulation of genes encoding chalcone isomerase and flavone synthase, which are involved in isoflavone synthesis. Six triterpenoid saponins were significantly enriched only in the roots. The leaves did not accumulate glycyrrhetinic acid because of low expression levels of genes involved in its synthesis. A gene encoding a UDP glycosyltransferase, which likely catalyzes the key step in the transformation of glycyrrhetinic acid to glycyrrhizin, was screened. Our results provide information about the differences in flavonoid and triterpenoid synthesis between roots and leaves, and highlight targets for genetic engineering.
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Research of Circuit Working Construction Elevator with Single-guide Rail and Multi-cages
Kun Zhang,Kaiqiang Wang,Di Li,Qing Sun,Zhen Ye,Wei Liu Council on Tall Building and Urban Habitat Korea 2022 International journal of high-rise buildings Vol.11 No.2
As one of the most important vertical transportation equipment in super high-rise buildings, the construction elevator directly affects the project period, cost, and effectiveness. The paper proposes a new construction elevator with single-guide rail and multi-cages. It can solve the problems of single construction elevator capacity shortage and efficacy decrease with height reduction, the occupancy of plan and elevation position of multiple construction elevators, and extension of total construction period by cycling operation of multi-cages on a single-guide rail. The paper focuses on the design and research of the main components of the equipment, such as the rotating guide rail mechanism, vertical bearing mast tie system, segmented electrical power supply system, group control scheduling system, and safety anti-collision system.
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Significant Progress in Construction Equipment of Super High-Rise Building
Zhang, Kun,Wang, Hui,Wang, Kaiqiang,Cui, Jian,Chen, Bo,Li, Di Council on Tall Building and Urban Habitat Korea 2018 International journal of high-rise buildings Vol.7 No.3
The construction of rapid developing super high-rise buildings constantly faces great challenges and the innovation of construction equipment is a focus of these challenges. In this paper, three new inventions including the operation platform, tower crane and hoist are put forward around two of the most important issues of super high-rise building construction: vertical transportation and operation environment. Study background, composition of the equipment, working principles and key technologies are introduced in sequence. In the end, the paper summarizes the main problems in the further development of construction equipment.
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Study of Material Removal Behavior during Laser-assisted Ultrasonic Dressing of Diamond Wheel
Zhibo Yang,Shiyu Zhang,Junchen Hu,Zhen Zhang,Kaiqiang Li,Bo Zhao 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
Laser-assisted ultrasonic dressing (LUD) of the removal behavior of diamond wheel material is investigated by simulation and experimental method. The finite element model of diamond wheel is constructed for simulation during LUD. The effect of parameters of LUD process on the dressing force is discussed according to the simulation results. LUD experiments of diamond wheels are carried out after obtaining optimization of parameter. The dressing force obtained from simulation and experiments are compared. It is found that the variation tendency of simulated dressing force is in agreement with the experimental result. This indicates that the simulation results can be effectively used for the selection of process’ parameters.
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