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      • KCI등재

        Deformation research of Silty Clay Under Freeze-Thaw Cycles

        Lihui Tian,Liangliang Yu,Shiming Liu,Bo Zhang 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.2

        To explore the dynamic properties of silty clay in seasonally frozen ground under repeated freeze-thaw cycles, an unconsolidated undrained dynamic triaxial test was conducted on such properties under various confining pressures, number of freeze-thaw cycles, and dynamic stress amplitudes. The test results showed that due to the impact of freeze-thaw cycles, the inherent structure of the soil underwent some major changes, in which the resilient strain increased and the resilient modulus decreased. However, as the number of freeze-thaw cycles increased, the effect was reduced and eventually tended to be stable. As the number of freeze-thaw cycles increased, the cumulative plastic strain of the soil rose rapidly, and the soil samples became more prone to fracture at low stress amplitudes and small number of vibrations. The more the number of freeze-thaw cycles, the higher the cumulative plastic strain rate generated under a single dynamic stress amplitude. Moreover, with the increase in the confining pressure, the failure form of the thawed silty clay gradually evolved from a plastic fracture to a brittle one. The research results of this paper were helpful to further understand the influence of freeze-thaw cycle on the dynamic properties of silty clay, and provide data support for the subsequent research on the mechanism of roadbed diseases under the load in seasonally frozen ground.

      • KCI등재

        Global Financial Crisis and China's Transition: Balancing Market Power with Active Role of the Government

        Jing Ma,LIHUI TIAN 한국국제경제학회 2012 International Economic Journal Vol.26 No.3

        China's transition is uncompleted in terms of privatization and of government intervention into economic activities. However, China performed relatively well in handling the 1997 Asia Financial Crisis and the 2008 American Financial Storm, as it keeps a strong government on both macro-economic management and corporate activities. This paper provides some evidence from China to support the theories of developmentalists on the active role of governments in economic development and market failures. We argue that the success of transition requires a balance of market power and government regulations.

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        Characterization and development of EST-SSR markers to study the genetic diversity and populations analysis of Jerusalem artichoke (Helianthus tuberosus L.)

        Shipeng Yang,Qiwen Zhong,Jie Tian,Lihui Wang,Mengliang Zhao,Li Li,Xuemei Sun 한국유전학회 2018 Genes & Genomics Vol.40 No.10

        In recent years, Jerusalem artichoke has received widespread attention as a novel source of sugar, biofuel, and animal feed. Currently, only few gDNA-SSRs derived from sunflower were verified in the Jerusalem artichoke; therefore, it is particularly important to develop SSR primer markers that belonged to Jerusalem artichoke resources. Using EST data to develop EST-SSR markers is simple and effective. In order to understand the general characteristics of SSR markers in Jerusalem artichoke EST sequences and accelerate the use of SSR markers in Jerusalem artichoke research. This study used 40,370 sequenced unigene fragments and MISA software to identify SSR loci. The 48 pairs of EST-SSR primers assessed for the identification of 45 varieties of Jerusalem artichoke. Cluster, genetic diversity parameters and AMOVA analysis was conducted using the genetic similarity coefficient, revealing genetic differences between 48 genetic material. A total of 1204 SSR loci were identified with 13 different types of repeats, distributed among 1020 EST sequences, of which trinucleotide repeats were the most common, accounting for 38.21% of the total SSR loci. Among the 44 repeat motifs, AG/CT, AAG/ CTT, and ATC/ATG motifs had the highest frequencies, accounting for 22.45, 14.71, and 7.84% of all motifs, respectively. From these sequences, 48 pairs of EST-SSR primers were designed, and 22 primer pairs for loci with high polymorphism were selected to analyze the genetic diversity of 45 Jerusalem artichoke germplasm sources. The results indicated that the variation range of the effective number of alleles for 22 primers ranged between 1.7502 and 4.5660. The Shannon’s information index ranged between 0.6200 and 1.6423. The variation range of PIC ranged between 0.3121 and 0.6662 with an average of 0.5184. Cluster analysis was conducted using the genetic similarity coefficient, revealing significant genetic differences between Asian and European genetic material. Cluster analysis revealed a relationship between the genotypes and geographic origins of the Jerusalem artichoke. The results of AMOVA as well as the genetic identity and genetic distance in the Jerusalem artichoke population showed that there presented certain genetic heterogeneity in Jerusalem artichoke genetic structure of 45 samples from seven different geographic populations. The Jerusalem artichoke EST-SSR marker system established in this study provides an effective molecular marker system for future research focused on Jerusalem artichoke genetic diversity and the breeding of new varieties.

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