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Morphological Variation of Cultivated and Weedy Types in Perilla Crop Collected from South Korea
Zhen Yu Fu,사규진,이수경,이주경 한국약용작물학회 2023 한국약용작물학회지 Vol.31 No.1
Background: Perilla (Perilla frutescens L.) has been widely cultivated and used for medicinal use, aromatic, functional food, and ornamental plant in South Korea. To understand the morphological variation in the cultivated and weedy types of Perilla (CWTP) collected from South Korea, 52 accessions collected from different areas were evlauated using one quantitative and 10 qualitative characteristics. Methods and Results: Principal component analysis (PCA) was performed using the NTSYS-pc V2.1 program to detect the differences among the accessions of the CWTP. Multivariate analysis was performed using Microsoft Excel Statistical Analysis System. The cultivated P. frutescens var. frutescens and two weedy types of Perilla crop were accurately distinguished based on he 11 morphological characteristics, paricularly seed related traits, used in the study. PCA results showed that, most morphological characteristics such as weight per 100 seeds (QN1), color of leaf adaxial side (QL1), color of leaf abaxial side (QL2), stem color (QL4), flower color (QL5), seed size (QL9), and seed hardness (QL10) provided a significant contribution in the positive or negative direction on the first axis. These characteristics are considered useful for distinguishing between accessions of the CWTP collected from South Korea. Conclusions: The accessions of weedy P. frutescens var. frutescens are located between the accessions of cultivated P. frutescens var. frutescens and the those of weedy P. frutescens var. crispa on the first axis. Although the cultivated and weedy types of P. frutescens var. frutescens and the two weedy types of P. frutescens var. frutescens and P. frutescens var. crispa cannot be completely distinguished, the results provide useful information for future studies on the identification and classification of CWTP germplasm accessions collected from different areas in South Korea
Yu-xiong Liang,Qing-song Feng,Mei-zhen Fu,Bi-tao Wu,Jian-fei Lu,Guo-xi Tang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
Ground vibrations caused by the construction of impact drilling piles may affect adjacent bridges, so corresponding prediction and monitoring are necessary to ensure the safety of bridges. In this study, the construction near an existing long-span double-convex arch bridge is taken as a case study to investigate different layouts of construction machines emanating harmful ground vibrations to the existing adjacent bridge by numerical simulations and monitoring. The peak acceleration and velocity acquired from numerical simulations, and monitoring were successfully used to implement impact drilling pile construction near the existing bridge. The results show that there are good consistencies between the monitoring and numerical simulation results, and the vibration acceleration of the foundation of abutments and piers are mainly derived from the vibration caused by the construction within a distance of 50 m, while the construction beyond 50 m has little effect on the old bridge. The numbers and locations of machines near the same foundation may have a weakening or strengthening effect on the peak acceleration and velocity due to destructive and constructive interference of waves, which can help to control the effects of the vibrations of the existing adjacent bridge.
Fu Li,Pengfei Fei,Yongchun Dong,Man Zhang,Yu Feng,Shuqiang Liu,Lu Jia,Hulin Zhang,Zhen Ni 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
To balance the specific surface area and porous structure of nanofibrous heterogeneous Fenton catalyst for therapid transfer of dye molecules during dye-containing wastewater treatment, a polyacrylonitrile nanofiber with bimodaldiameter distribution (n-PAN-D) was prepared and amidoximated, followed by coordinating with Fe3+ ion (Fe-AO-n-PAND). The modification and coordination process hardly changed the fiber morphology and bimodal diameter distribution ofnanofiber membrane. The amidoximated degree of n-PAN-D increased with the increase of the diameter difference, and thecoordination ability of amidoximated n-PAN-D decreased with increasing the diameter difference. Fe-AO-n-PAN-D hadbetter catalytic activity than those with similar thick or thin nanofiber diameters due to the rapid mass transfer of dyemolecules in the catalyst. The possible oxidation and degradation pathway of Reactive Red 195 in the Fe-AO-n-PAN-D/H2O2system was proposed. And the series of reactions may not gradually occur because of the non-selective oxidation of ·OH. Thegood reusability of Fe-AO-n-PAN-D made it potential carrier for heterogeneous Fenton catalyst in wastewater treatment.
A field investigation on an expansive soil slope supported by a sheet-pile retaining structure
Zhen Zhang,Yu-Liang Lin,Hong-Ri Zhang,Bin He,Guo-Lin Yang,Yong-Fu Xu 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.91 No.3
An expansive soil in 4970 special railway line in Dangyang City, China, has encountered a series of landslides due to the expansion characteristics of expansive soil over the past 50 years. Thereafter, a sheet-pile retaining structure was adopted to fortify the expansive soil slope after a comprehensive discussion. In order to evaluate the efficacy of engineering measure of sheet-pile retaining structure, the field test was carried out to investigate the lateral pressure and pile bending moment subjected to construction and service conditions, and the local daily rainfall was also recorded. It took more than 500 days to carry out the field investigation, and the general change laws of lateral pressure and pile bending moment versus local daily rainfall were obtained. The results show that the effect of rainfall on the moisture content of backfill behind the wall decreases with depth. The performance of sheet-pile retaining structure is sensitive to the intensity of rainfall. The arching effect is reduced significantly by employing a series of sheet behind piles. The lateral pressure behind the sheet exhibits a single-peak distribution. The turning point of the horizontal swelling pressure distribution is correlated with the self-weight pressure distribution of soil and the variation of soil moisture content. The measured pile bending moment is approximately 44% of the ultimate pile capacity, which indicates that the sheet-pile retaining structure is in a stable service condition with enough safety reserve.
Identifying Creep and Destructuration Related Soil Parameters by Optimization Methods
Yin-Fu Jin,Zhen-Yu Yin,Yvon Riou,Pierre-Yves Hicher 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.4
The paper aims to construct an efficient optimization method for identifying creep and destructuration related governing parameters of soft structured clay. An elastic viscoplastic model has been developed and adopted. Different optimization processes, by genetic algorithm or particle swarm optimization with uniform or random samplings initialization methods, are carried out to obtain the material parameters from conventional undrained triaxial tests performed on a K0-concolidated natural soft clay. All comparisons demonstrate that the uniqueness of the solution is better guaranteed with the genetic algorithm rather than with the particle swarm optimization method. Furthermore, the efficiency of genetic algorithm has been verified by simulating other tests.
Ma, Xun,Yu, Guang-Yan,Zhang, Zhen-Kang,Li, Sheng-Lin,Fu, Jia,Zhang, Kui-Hua Korean Academy of Oral Biology and the UCLA Dental 2001 International Journal of Oral Biology Vol.26 No.3
Regeneration and functional recovery of facial nerves after injury are still far from satisfaction. Studies on whether Schwann cells of injured facial nerves could secrete neurotrophic factors to promote nerve regeneration are rare, and that is the pbjective of this study. Schwann cells from Wallerian degenerating segments of rats facial nerves were isolated and cultured in conditioned culture medium, collected, concentrated and fractionated by ultra-filtration. The neurotrophic bioactivity of the soluble secretions from cultured Schwann cells were examined on an established neuron culture model. Dil fluorescence labeling facial motoneurons from neonatal rats, MTT assay, and image analysis for survival of facial motoneurons were used. The results show that facial motoneuron survival activity in Schwann cell culture medium containing a molecular weight larger than 30 kDa component, was significantly higher than in medium with and without serum (p<0.05 and p<0.01 respectively). The effect could be extinguished by either boiling or trypsinizing. At the 2nd, 4th and 7th days after conditioned culture, mean perikaryon area and neurite length of facial motoneurons in a medium containing molecular weight larger than 30kDa component, were significantly larger than in serum containing medium. The results show that Schwann cells from Wallerian degenerating facial nerves in serum-free and neurite re-growth of facial motoneurons in vitro. The results also suggest that the neurotrophic effect might be derived from protein(s) or peptide(s) with molecular weight larger than 30 kDa component of the soluble secretions. It may be potent for functional repair of facial verve and other neural disorders.
Multi-Phase MPCA Modeling and Application Based on an Improved Phase Separation Method
Shu Wang,Yu-Qing Chang,Zhen Zhao,Fu-Li Wang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.6
Regarding the multi-phase characteristic of batch process, a new phase separation method is developed in this paper. The method realizes a 3-step sub-phase separation of the batch process using the retained principal components number, loading matrixes and principal component matrixes, which can adequately reflect the features variation of the process. In line with the different features and clas-sification step, automatic identification of ‘burrs’ and transition phases has been expounded. The pro-posed method can directly separate the stable phases and transition phases in the batch process, and deduce high-precision transition phase models. Based on the proposed method, the MPCA modeling and online monitoring is applied in the injection molding process. The experimental results have veri-fied the effectiveness of the proposed method.