Impact response of a novel flat steel-concrete-corrugated steel panel

Jingyi Lu,Yonghui Wang,Ximei Zhai,Hongyuan Zhou 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.2

A novel flat steel plate-concrete-corrugated steel plate (FS-C-CS) sandwich panel was proposed for resisting impact load. The failure mode, impact force and displacement response of the FS-C-CS panel under impact loading were studied via drop-weight impact tests. The combined global flexure and local indentation deformation mode of the FS-C-CS panel was observed, and three stages of impact process were identified. Moreover, the effects of corrugated plate height and steel plate thickness on the impact responses of the FS-C-CS panels were quantitatively analysed, and the impact resistant performance of the FS-C-CS panel was found to be generally improved on increasing corrugated plate height and thickness in terms of smaller deformation as well as larger impact force and post-peak mean force. The Finite Element (FE) model of the FS-C-CS panel under impact loading was established to predict its dynamic response and further reveal its failure mode and impact energy dissipation mechanism. The numerical results indicated that the concrete core and corrugated steel plate dissipated the majority of impact energy. In addition, employing end plates and high strength bolts as shear connectors could prevent the slip between steel plates and concrete core and assure the full composite action of the FS-C-CS panel.

Emotional Evaluation Factors of Virtual Human in Museums

Lu Jingyi,Jung-Ho, Jung 한국콘텐츠학회 2023 한국콘텐츠학회 ICCC 논문집 Vol.2023 No.12

The Performance Promotion of Polyphenylene Sulfide Fibers Based on the Hygroscopic and Dyeable Characteristics

Jingyi Ren,Dandan Lian,Jianjun Lu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5

The hygroscopic and dyeable polyphenylene sulfide (PPS) composite fiber was prepared using a twin-screwextruder and a melt spinning machine. A new dyeing process was proposed and the moisture absorption and dyeingmechanism of the composite fiber was analyzed. The results show that sodium polyacrylate (PAAS) is uniformly dispersed inthe PPS matrix and is compatible with PPS at the macromolecular level. The thermal properties of the composite fibers arebasically unchanged, and the crystallinity is slightly reduced. With the increase of PAAS content, the normal moisture regainof the composite fiber reached 2.11 % from 0.21 %, and the contact angle decreased from 73.8 ° to 52.3 °. Under the newdyeing technology, the dyeing rate of the composite fiber reached 93 %, and the washing fastness was grade 5. Themechanism of hygroscopicity and dyeing of macromolecular space networks and polyelectrolyte was proposed.

Removal and fate of carbamazepine in the microbial fuel cell coupled constructed wetland system

Jingyi Xie,Haixiao Li,Shiyu Wang,Hao Chen,Wei Jiang,Lin Zhang,Lianjie Wang,Yufeng Wu,Lirong Li,Xueqiang Lu 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.3

Carbamazepine (CBZ), which is difficult to remove in the wastewater treatment system and easily forms toxic transformation products during the treatment process, is one of the priority pollutants of pharmaceuticals and personal care products (PPCPs). Increasing attention has been paid to explore their treatment technology without side effects from the treatment products. This study aims to reveal the removal and transformation of CBZ in the microbial fuel cell coupled constructed wetland (CW-MFC) system. The CW-MFC system was operated continuously at room temperature for nearly 80 days. The results show that CW-MFC system can effectively remove CBZ with an average removal rate of 97%. Three transformation products were identified by liquid chromatography−high-resolution mass spectrometry: 2-(2-oxoquinazolin-1(2H)-yl) benzoic acid (TP267), methyl 2-(2-oxoquinazolin-1(2H)-yl) benzoate (TP281), 2-(2,4-dioxo-3,4-dihydroquinazolin-1(2H)-yl) benzoic acid (TP283). Except TP281 in the influent, the other transformation products were formed in the system, which indicated that TP267 and TP283 were the main transformation products of CBZ. The formation pathway of transformation products could be explained by reactions including oxidation, hydrolysis, bond rupture and intramolecular reaction. The results also indicate that the CW-MFC system might be a promising technology for PPCPs treatment.

Objectives, challenges, and prospects of batch processes: Arising from injection molding applications

Yuanqiang Zhou,Zhixing Cao,Jingyi Lu,Chunhui Zhao,Dewei Li,Furong Gao 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

Injection molding, a polymer processing technique that converts thermoplastics into a variety of plasticproducts, is a complicated nonlinear dynamic process that interacts with a different group of variables, including themachine, the mold, the material, and the process parameters. As injection molding process operates sequentially inphases, we treat it as a batch process. The review paper discusses the batch nature of injection molding and identifies thethree main objectives for future development of injection molding: higher efficiency, greater profitability, and longer sustainability. From the perspective of system engineering, our discussion centers on the primary challenges for the batchoperation of injection molding systems: 1) Model development in face of product changes, 2) Control strategies in face ofdynamic changes, 3) Data analysis and process monitoring, and 4) Safety assurance and quality improvement, and thecurrent progress that has been made in addressing these challenges. In light of the advancement of new informationtechnologies, this paper provides several opportunities and encourages further research that may break existing capabilitylimits and develop the next generation of automation solutions to bring about a revolution in this area.

Interaction Between Serum/Glucocorticoid-Regulated Kinase 1 and Interleukin-6 in Chronic Rhinosinusitis

Lai Yuting,Hu Li,Yang Lu,Hu Xianting,Song Xiaole,Yang Jingyi,Li Hongbin,Chen Kun,Li Huabin,Wang Dehui 대한천식알레르기학회 2021 Allergy, Asthma & Immunology Research Vol.13 No.5

Purpose: Serum/glucocorticoid-regulated kinase 1 (SGK1) has recently emerged as a critical regulator of inflammatory diseases. In this study, we examined SGK1 expression and its possible pathogenic roles in chronic rhinosinusitis (CRS). Methods: Immunohistochemistry, western blotting, Bio-Plex assay, enzyme-linked immunosorbent assays, and quantitative real-time polymerase chain reaction were performed to assess protein and gene expression levels. The mRNA expression levels of SGK1 and interleukin-6 (IL-6) were extracted from a CRS database to perform correlation analysis. Stable cell lines with SGK1 overexpression (16HBE) and knockdown (A549) were constructed to investigate the interaction between SGK1 and IL-6 in vitro. Results: SGK1 exhibited strong cytoplasmic and nuclear staining in the epithelial layers and the lamina propria of nasal polyps (NPs) and in the mucosal tissues of CRS without nasal polyps (CRSsNP). The mRNA and protein expression levels of SGK1 and IL-6 were significantly increased in NPs and CRSsNP tissues, compared to control tissues. SGK1 phosphorylation was significantly greater in NPs than in CRSsNP tissues (P < 0.01). The mRNA levels of SGK1 and IL-6 were significantly correlated (P < 0.001, r = 0.649). Exposure to IL-6 significantly increased SGK1 expression in cultured dispersed NP cells, 16HBE cells, and A549 cells. IL-6 expression was significantly down-regulated in SGK1-overexpressing 16HBE cells (P < 0.01) and significantly up-regulated in SGK1-knockdown A549 cells (P < 0.05). Administration of GSK650394, a SGK1 inhibitor, significantly increased IL-6 self-induced mRNA expression in cultured dispersed NP cells and 16HBE cells. Conclusions: The interaction between SGK1 and IL-6 may play an anti-inflammatory role in IL-6-induced inflammation in the pathogenesis of CRS.

Finite Element Modeling of Steel–Concrete–Steel Sandwich Beams with Bolt Connectors Under Drop Weight Impact

Tilak Prasad Sah,Yonghui Wang,Jingyi Lu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5

This paper develops a three-dimensional Finite Element (FE) model using the non-linear explicit code in LS-DYNA to predict the impact behavior of Steel–Concrete–Steel (SCS) sandwich beams with bolt connectors. The accuracy of the developed FE model is validated by comparing the FE-predicted impact force and displacement–time histories with the experimental results of the SCS sandwich beams. The FE prediction shows a close match with the test results. Using the validated FE model, parametric studies are carried out to investigate the infl uences of diff erent parameters, i.e., spacing of connectors, strength of concrete, presence of endplates, location of impact, mass of drop weight, and height of drop. It is found that the spacing of connectors and the strength of concrete have a limited infl uence on the impact resistance of the SCS sandwich beams with bolt connectors. However, the concrete strength signifi cantly aff ects the inertial peak impact force. The SCS sandwich beam without endplates shows higher deformation compared to the beam with endplates, and the location of impact exhibits infl uence on the impact resistance of the SCS sandwich beams. It is also revealed that the maximum displacements of the SCS sandwich beams could substantially rise with the increase in mass of drop weight and height of drop.