Seismic Behavior Investigation on Blind Bolted CFST Frames with Precast SCWPs

Jingfeng Wang,Qihan Shen,Beibei Li 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5

To explore seismic behavior of blind bolted concrete-fi lled steel tube (CFST) frames infi lled with precast sandwich composite wall panels (SCWPs), a series tests of blind bolted square CFST frames with precast SCWPs under lateral low-cyclic loading were conducted. The infl uence of the type of wall concrete, wall-to-frame connection and steel brace setting, etc. on the hysteretic curves and failure modes of the type of composite structure was investigated. The seismic behavior of the blind bolted CFST frames with precast SCWPs was evaluated in terms of lateral load–displacement relation curves, strength and stiff ness degradation, crack patterns of SCWPs, energy dissipation capacity and ductility. Then, a fi nite element (FE) analysis modeling using ABAQUS software was developed in considering the nonlinear material properties and complex components interaction. Comparison indicated that the FE analytical results coincided well with the test results. Both the experimental and numerical results indicated that setting the external precast SCWPs could heighten the load carrying capacities and rigidities of the blind bolted CFST frames by using reasonable connectors between frame and SCWPs. These experimental studies and FE analysis would enable improvement in the practical design of the SCWPs in fabricated CFST structure buildings.

Stable Microbial Community and Specific Beneficial Taxa Associated with Natural Healthy Banana Rhizosphere

( Lin Fu ),( Yannan Ou ),( Zongzhuan Shen ),( Beibei Wang ),( Rong Li ),( Qirong Shen ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.10

Banana planting altered microbial communities and induced the enrichment of Fusarium oxysporum in rhizosphere compared with that of forest soil. Diseased plant rhizosphere soil (WR) harbored increased pathogen abundance and showed distinct microbial structures from healthy plant rhizosphere soil (HR). The enriched taxon of Bordetella and key taxon of Chaetomium together with some other taxa showed negative associations with pathogen in HR, indicating their importance in pathogen inhibition. Furthermore, a more stable microbiota was observed in HR than in WR. Taken together, the lower pathogen abundance, specific beneficial microbial taxa and stable microbiota contributed to disease suppression.

Knock-down of OsLOX by RNA interference leads to improved seed viability in rice

Suyang Bai,Niqing He,Lu Zhou,Beibei Shen,Wei Wu,Xi Liu,Ling Jiang,Jianmin Wan 한국식물학회 2015 Journal of Plant Biology Vol.58 No.5

Previous work found that lipoxygenases were key enzymes in lipid peroxidation, which causes grain deterioration during storage. In order to obtain better seed viability in rice, 10 marker-free knock-down lines were obtained in the progeny of endogenous OsLOX knock-down mutations caused by the RNAi technology. After artificial accelerated aging, there were four types of knock-down lines with higher seed viability than wild type (receptor parent). OsLOX3 knock-down line NPF1 was of special interest. In a series of experiments, including Southern blots, analysis of OsLOX3 expression, and enzymatic activity, NPF1 had better seed viability than wild-type. We also investigated the main agronomic characters of both knock-down lines and non-transgenetic wild type families. Knock-down lines were identified with generally excellent agronomic characteristics similar to the wild-type.

Effect of activated persulfate on the properties of contaminated soil and degradation behavior of PAHs

Yamin Hong,Xiupeng Yue,Yaping Zhang,Kai Shen,Wentao Jiao,Lei Zhao,Beibei Li 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3

Sulfate radical-based advanced oxidation processes have been applied in the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil, during which sulfate can be activated in different ways. In this work, effects of four different ways (FeSO4, NaOH, H2O2, and Heat) activated sodium persulfate (PS) on PAHs removal and soil physicochemical properties (pH, organic matter, functional groups, surface morphology, and partial heavy metal elements) were compared, and the influencing factors and mechanism of soil PAHs removal by thermally activated PS were also studied. The results showed that at the dosage of 3% of persulfate, the removal efficiency of PAHs followed the sequences of Heat (91.4%) > FeSO4 (86.6%) > H2O2 (86.2%) > NaOH (72.9%). However, thermal activation decreased the soil pH and organic matter content more significantly than other treatments. The reaction tended to reach equilibrium at 6 h when the dosage of persulfate was 3% and the activation temperature was 60 °C, and the reaction obeyed pseudo-first-order kinetics. Through quenching experiments, it was found that the free radicals playing a dominant role in the oxidation process were sulfate radicals. Compared with pH, liquid to soil (L/S ratio) and the temperature had more significant impacts on the degradation efficiency of PAHs.

Multimode participation of traditional Chinese medicine in the treatment of COVID-19

Tieying Dai,Leyin Zhang,Xinyang Dai,Xinran Zhang,Beibei Lu,Yuxi Zheng,Deyi Shen,Yici Yan,Congqi Ji,Jieru Yu,Leitao Sun 한국한의학연구원 2021 Integrative Medicine Research Vol.10 No.-

Background The outbreak of COVID-19 has swiftly spread across China and all over the world, resulting in severe contagious pneumonia. However, no specific anti-COVID-19 drugs or methods are available for the treatment of this acute and fatal disease. In recent years, as the efficacy and safety of traditional Chinese medicine (TCM) have been universally acknowledged, it has been brought to a crucial status domestically and overseas for the treatment of COVID-19. Methods We searched relevant literature, electronic databases, and official statements, diagnoses and protocols to retrieve studies and applications related to traditional Chinese medicine for COVID-19 in terms of regulations and policies, clinical evidence, preclinical rationale and big data analysis and then summarized the discovery and development of potential drugs and their targets. Results Clinicians, researchers, governments, the public, colleges, institutes and companies collected and classified associated policies, regulations and actual contributions, searched clinical trials and preclinical experimental outcomes from databases, studied potential TCM drugs with possible mechanisms, retrieved numerous big data analysis method and gathered pooled results of compounds along with their effective targets to make traditional Chinese medicine vital to cover all stages of patients in the treatment and control of COVID-19. Conclusion Traditional Chinese medicine provides new evidence to support the clinical value of TCM for COVID-19. Background The outbreak of COVID-19 has swiftly spread across China and all over the world, resulting in severe contagious pneumonia. However, no specific anti-COVID-19 drugs or methods are available for the treatment of this acute and fatal disease. In recent years, as the efficacy and safety of traditional Chinese medicine (TCM) have been universally acknowledged, it has been brought to a crucial status domestically and overseas for the treatment of COVID-19. Methods We searched relevant literature, electronic databases, and official statements, diagnoses and protocols to retrieve studies and applications related to traditional Chinese medicine for COVID-19 in terms of regulations and policies, clinical evidence, preclinical rationale and big data analysis and then summarized the discovery and development of potential drugs and their targets. Results Clinicians, researchers, governments, the public, colleges, institutes and companies collected and classified associated policies, regulations and actual contributions, searched clinical trials and preclinical experimental outcomes from databases, studied potential TCM drugs with possible mechanisms, retrieved numerous big data analysis method and gathered pooled results of compounds along with their effective targets to make traditional Chinese medicine vital to cover all stages of patients in the treatment and control of COVID-19. Conclusion Traditional Chinese medicine provides new evidence to support the clinical value of TCM for COVID-19.