Scenario Seismic Landslide Hazard Assessment Using both Spectrum and Energy Compatible Artificial Acceleration Accelerograms at Slope Sites

( Liu Jiamei ),( Wang Tao ),( Wu Shuren ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

The northern slope of Tianshui area, Northwest of China, is a high-risk area for earthquake landslides with group of huge landslides. With the development of the economy, its seismic landslide hazard assessment under specific earthquake scenario is urgently needed. In order to bring suitable seismic inputs, an artificial synthetic accelerograms generation method is adopted. The acceleration response spectrum and Arias Intensity at bedrock are estimated through empirical attenuation relationships. Seismic effects of slope site are determined using microtremor observations. The artificial synthetic accelerograms are generated by the method proposed by Li et al. (2017), which introduce an energy compatible algorithm to the spectrum-compatible mode to match both the estimated response spectrum in the frequency domain and Arias Intensity in the time domain. The artificial acceleration time histories are then combined with the slope threshold accelerations to calculated cumulative displacements by double integration. Potentially unstable areas are identified based on the predicted Newmark displacements. The results can be utilized by local government for detailed risk evaluation, civil protection, and emergency plans, as well as for engineering design of critical structures.

Nanocellulose-Based Hybrid Hydrogels as Flexible Cathodes of Aqueous Zn-Ion Batteries

Jingze Liu,Jiamei Lai,Xingyuan Huang,Hesheng Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4

Cellulose nanofibers, detached from natural plants, are very promising for applications in the energy storage devices. The swelling of cellulose nanofibers provides abundant paths in the hybrid hydrogels for ion diffusion towards the active material. There is an optimal composition of 50 wt.% for cellulose nanofibers in the hybrid hydrogels due to the balance between ion diffusion and electron transport, that is, facilitated by conductive graphite nanoplatelets. The aqueous Zn-ion batteries, assembled from the optimized hybrid hydrogels, have a high-specific capacity of 149.4 mAh/g and energy density of 113.2mWh/g, respectively. Moreover, high flexibility of the aqueous Zn-ion batteries is guaranteed by the hybrid hydrogels. There is only a little decay in the electrochemical performance under mechanical bending.

The first complete chloroplast genome of <i>Polygonatum hirtellum</i>: Genome features and phylogenetic relationships

LIAO Binbin,Jiamei ZHENG,LIU Rong,LIU Yinglin,LIU Xi,CHEN Xubing 한국식물분류학회 2024 식물 분류학회지 Vol.54 No.1

<i>Polygonatum hirtellum</i> is a perennial herb within the family Asparagaceae. In the present study, the chloroplast (cp) genome of <i>P. hirtellum</i> is reported for the first time, and its phylogenetic relationships are also investigated. The findings revealed that the cp genome was 155,697 bp and exhibited a typical quadripartite structure, consisting of a large single copy (84,468 bp), a small single copy (18,491 bp), and a pair of invert repeat sequences (26,369 bp). The GC content of the cp genomes amounted to 37.7%; 130 genes were identified, consisting of 84 protein-coding genes, 38 transfer RNA genes, and eight ribosomal RNA genes. A phylogenetic analysis based on the cp genome and coding sequence showed that <i>P. hirtellum</i> was a member of section <i>Verticillata</i> and could be distinguished from other species of the genus <i>Polygonatum</i> used in the analysis.

A Nation Scale Seismic Landslide Hazard Assessment of China

( Tao Wang ),( Jiamei Liu ),( Jusong Shi ),( Zetong Li ),( Peng Xin ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

Mountainous area accounts for about 69% of Chinese land area. Most of these mountainous areas are classified as high seismic intensity zones. This specific geological background makes China one of the countries encountered most serious seismic landslide losses. However, there is not such a seismic landslide hazard assessment result in nationwide scale available. For potential seismic landslide risk prevention and reduction, authors conduct a preliminary seismic landslide hazard assessment on a countrywide scale based on the Newmark d isplacement a nd i nformation v alue m odels. Firstly, t he P robabilistic S eismic H azard A nalysis (PSHA) method is applied to obtain peak ground acceleration (PGA) with a standard probability of exceedance (10% in 50 years). On the one hand, considering PGA results and engineering geological factors, the occurrence probability of seismic landslides under corresponding potential earthquake condition is analyzed based on Newmark displacement model. On the other hand, with the information value model, existing landslides and geospatial factors are considered, such as slope angle, relief, engineering geological lithology groups, distances to faults, distances to rivers. The landslide susceptibility is calculated based on information model. Furtherly, the seismic landslide hazard levels are obtained through matrix classification with susceptibility levels and PGA results. Finally, comprehensive seismic landslide hazard maps on a nationwide scale are zoned and the major cities of potentially highly hazard level are identified based on the predicted Newmark displacements and information values. The results represent a preliminary assessment which can provide reference for urban development, spatial plan and detailed seismic landslide risk management in national scale.

Research on the Formation Mechanism of Shear Zone in the Neogene Mudstone Landslide

( Xin Peng ),( Wang Tao ),( Liu Jiamei ),( Liang Changyu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

The shear zone is the main control factor for the translational and rotational landslides.Different geometric forms of landslides were selected to analyze the process of structural change and the mechanical mechanisms of the bedding-parallel shear zone in Neogen period mudstones. The results show that there are weak layers, with high clay content, in translational landslides and rotational-translational landslides, such as those with bedding-parallel shear zone, while rotational landslides are composed of homogeneous material. The bedding-parallel shear zone can be divided into two parts: the main shear zone and the secondary shear zone. The main shear zone has an S-C fabric, the C plane has a strong scratch, and the S plane develops in high plastic mudstones. The clay contents of the main shear zone in a bedding-parallel sliding zone are greater than 50%, while the absolute content of minerals mixed with illite and montmorillonite exceeds to 20%. Creep and rapid slip are the main forms of structural deformation of the shear zone. Creep deformation mainly develops in the sliding zone with high amounts of clay particles; the microstructural adjustment of the slip zone shows no crack expansion and the clay minerals are a viscous flow. Progressive creep induced by water pressure and gravity will cause the acceleration of the creep and rapid sliding. Rapid sliding deformation, which is due to repeated shear, occurs along the fixed shear fracture-surface.

PFP@PLGA/Cu12Sb4S13-mediated PTT ablates hepatocellular carcinoma by inhibiting the RAS/MAPK/MT-CO1 signaling pathway

Dong Tianxiu,Jiang Jian,Zhang Hao,Liu Hongyuan,Zou Xiaomeng,Niu Jiamei,Mao Yingxuan,Zhu Mingwei,Chen Xi,Li Zizhuo,Chen Yaodong,Shi Chunying,Yang Xiuhua 나노기술연구협의회 2021 Nano Convergence Vol.8 No.29

Hepatocellular carcinoma (HCC) is one of the most malignant tumors in the world, and patients with HCC face a poor prognosis. The conventional therapeutic strategies for HCC have undergone a challenge-riddled evolution owing to side effects and unsatisfactory efficacy. Here, aiming to provide a new method of HCC elimination, we formulated a novel multifunctional nanocapsule (PFP@PLGA/Cu 12 Sb 4 S 13 , PPCu) with applications in contrast-enhanced ultrasound imaging (CEUS) and photothermal therapy (PTT). These PPCu were successfully constructed with an average diameter of 346 nm (polydispersity index, PDI = 0.276). The reinforced contrast ratio of these PPCu was determined by CEUS, revealing their promising applications in image-guided monitoring of HCC treatment. Furthermore, the excellent photoabsorption and biocompatibility indicated by organ H&E staining indicated that PPCu meet quality expectations for use as photothermal transduction agent (PTA). PPCu treatment at 50 °C and higher temperatures efficiently repressed the proliferation, induced the apoptosis and decreased the motility of HCC cells. These effects might have been results of RAS/MAPK/MT-CO1 signaling pathway inhibition. In summary, PPCu were constructed to integrate CEUS and PTT successfully into therapy, which can lead to HCC elimination through RAS/MAPK/MT-CO1 signaling pathway repression.