Experimental and numerical investigation on post-earthquake fire behaviour of the circular concrete-filled steel tube columns

Yu-Hang Wang,Qi Tang,Mei-Ni Su,Ji-Ke Tan,Wei-Yong Wang,Yong-Sen Lan,Xiao-Wei Deng,Yong-Tao Bai,Wei Luo,Xiao-Hua Li,Jiu-Lin Bai 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.38 No.1

Post-earthquake fire is a common disaster which causes serious safety issues to infrastructures. This study aims to investigate the residual loading capacities of circular concrete-filled steel tube (CFST) columns under post-earthquake fire experimentally and numerically. The experimental programme contains two loading steps - pre-damage cyclic loading at room temperature and transient state tests with constant compression loads. Three finite element models are developed and validated against the test results. Upon validation, a total of 48 numerical results were generated in the parametric study to investigate the effects of thickness and strengths of steel tube, axial compression ratio and damage degree on the fire resistance of circular CFST columns. Based on the analysis on experimental and numerical results, the loading mechanism of circular CFST columns is discussed. A design method is proposed for the prediction of fire resistance time under different seismic pre-damage and compression loads. The predictions by the new method is compared with the newly generated experimental and numerical results and is found to be accurate and consistent with the mean value close to the unity and a coefficient of variation around 1%.

Overexpression of the MYB transcription factor MYB28 or MYB99 confers hypersensitivity to abscisic acid in arabidopsis

Yong-Tao Yu,Zhenwu Zhu,Kai Lu,Chao Bi,Shan Liang,Xiao-Fang Wang,Da-Peng Zhang 한국식물학회 2016 Journal of Plant Biology Vol.59 No.2

The phytohormone abscisic acid (ABA) plays a vital role in plant development and response to abiotic stress, and many components in ABA signaling remain to be discovered to fully understand the highly complex ABA signaling network. Here we reported that over-expression of MYB28 or MYB99, two R2R3 MYB transcription factors in Arabidopsis thaliana, confers hypersensitivity to exogenous ABA during seed germination, cotyledon greening and early seedling growth. However, both myb28-1 and myb99-1 knockout mutants exhibit wild-type ABA phenotypes most likely due to a functional redundancy of the multiple MYB members. Real-time PCR analysis shows that over-expression of the MYB28 or MYB99 changes expression of a subset of ABA-responsive genes. Collectively, these findings suggest that MYB28 and MYB99 play important, positive roles in ABA signaling during seed germination and early seedling growth.

Review of the Synthetic Techniques and Applications of the Quantum Dots/Graphene Composites

Yong Duan,Tianjian Zeng,Tao Sun,Ling Tong,Anran Chen,Jin Zhang,Rongfei Wang,Chong Wang,Yu Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5

The Quantum Dots/Graphene (QDs/GR) composites have attracted numerous interests caused by its unique physical and chemical properties in past few decades. The shortages of the single QD and graphene materials could be remedied by the synergistic effects from QDs/GR composite materials; meanwhile, some unique phenomena and superior physical properties were also produced. The QDs/GR composites processed better photocatalytic activities, higher photon capture abilities and excellent optical responsibilities. Therefore, they were widely applied in various techniques. Here, we reviewed and discussed recent research progresses about the QDs/GR composites and focused on their industrial preparation and commercial applications. Among these synthetic methods, ion beam sputtering deposition (IBSD) and molecular beam epitaxy (MBE) were discussed in detail because they could be directly applied in commercial industry for preparing size-tunable quantum dots. In another part, the applications of the QDs/GR composites were also discussed, the advanced physical and chemical properties promoted these composites to have numerous potential for being applied in photodetectors, lithium ion batteries, solar cells, supercapacitors and other devices. The appropriate synthetic method for QDs/GR materials is highly dependent on the requirements of its applications. We firmly believe that the direct synthesis technique of ideal QDs/GR composite for specific applications is a challenge and research emphasis for scientist and engineers in future.

Speed and Current Sensor Fault Detection and Isolation Based on Adaptive Observers for IM Drives

Yu, Yong,Wang, Ziyuan,Xu, Dianguo,Zhou, Tao,Xu, Rong The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5

This paper focuses on speed and current sensor fault detection and isolation (FDI) for induction motor (IM) drives. A new, accurate and high-efficiency FDI approach is proposed so that a system can continue operating with good performance even in the presence of speed sensor faults, current sensor faults or both. The proposed three paralleled adaptive observers are capable of current sensor fault detection and localization. By using observers, the rotor flux and rotor speed can be estimated which allows the system to run under the speed sensorless vector control mode when a speed sensor fault occurs. In order to detect speed sensor faults, a threshold-based scheme is proposed. To verify the feasibility and effectiveness of the proposed FDI strategy, experiments are carried out under different conditions based on a dSPACE DS1104 induction motor drive platform.

Speed and Current Sensor Fault Detection and Isolation Based on Adaptive Observers for IM Drives

Yong Yu,Ziyuan Wang,Dianguo Xu,Tao Zhou,Rong Xu 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5

This paper focuses on speed and current sensor fault detection and isolation (FDI) for induction motor (IM) drives. A new, accurate and high-efficiency FDI approach is proposed so that a system can continue operating with good performance even in the presence of speed sensor faults, current sensor faults or both. The proposed three paralleled adaptive observers are capable of current sensor fault detection and localization. By using observers, the rotor flux and rotor speed can be estimated which allows the system to run under the speed sensorless vector control mode when a speed sensor fault occurs. In order to detect speed sensor faults, a threshold-based scheme is proposed. To verify the feasibility and effectiveness of the proposed FDI strategy, experiments are carried out under different conditions based on a dSPACE DS1104 induction motor drive platform.

Experimental and numerical investigation on the behavior of concrete-filled rectangular steel tubes under bending

Tao Zhang,Yong-zhi Gong,Fa-xing Ding,Xue-mei Liu,Zhi-wu Yu 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.3

Pure bending loading conditions are not frequently occurred in practical engineering, but the flexural researches are important since it’s the basis of mechanical property researches under complex loading. Hence, the objective of this paper is to investigate the flexural behavior of concrete-filled rectangular steel tube (CFRT) through combined experimental and numerical studies. Flexural tests were conducted to investigate the mechanical performance of CFRT under bending. The load vs. deflection curves during the loading process was analyzed in detail. All the specimens behaved in a very ductile manner. Besides, based on the experimental result, the composite action between the steel tube and core concrete was studies and examined. Furthermore, the feasibility and accuracy of the numerical method was verified by comparing the computed results with experimental observations. The full curves analysis on the moment vs. curvature curves was further conducted, where the development of the stress and strain redistribution in the steel tube and core concrete was clarified comprehensively. It should be noted that there existed bond slip between the core concrete and steel tube during the loading process. And then, an extensive parametric study, including the steel strength, concrete strength, steel ratio and aspect ratio, was performed. Finally, design formula to calculate the ultimate moment and flexural stiffness of CFRTs were presented. The predicted results showed satisfactory agreement with the experimental and FE results. Additionally, the difference between the experimental/FE and predicted results using the related design codes were illustrated.

Effect of gelatin nano-coating containing Gardenia pigment on the preservation of pork slices

Yong Liu,Zi-Hao Liu,Chang-Qi Luo,Chun-Tao Xiao,Wen-Yu Zhou,Wen-Jin Xie 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.4

The nano-coating composed of gelatin and Gardenia pigment (GP) was successfully prepared and showed strong antioxidant activity. The average particle sizes of the nano-coating containing 0.1% and 0.3% GP were 269.58 and 394.13 nm, respectively. The pork slices uncoated and coated with the nano-coating were preserved at 4 C for 15 days. The pork slices’ pH, total volatile basic nitrogen (TVB-N), total viable counts (TVC), water-bind- ing capacity (WHC), and thiobarbituric acid reactive sub- stances (TBARS) were measured to assess the preservation effect of the nano-coating. The results showed that the pork coated with the nano-coating had lower pH, TVC, TVB-N, TBARS, and higher WHC, significantly different (p \ 0.05) than the uncoated pork. It is suggested that the proposed nano-coating can be used to effectively improve the pork’s quality and shelf life during refrigeration storage.

Effects of E-commerce Terminal Logistics Service Quality on Rural Residents' Online Purchasing Behavior — Case study: Jilin Province in China

Yu-cong Sun,Shi-yong Piao,Jin-tao Chen,Bobah Brillant Sisang,Jong-in Lee 한국국제농업개발학회 2021 韓國國際農業開發學會誌 Vol.33 No.4

농촌 종점 물류는 농촌 주민들의 온라인 쇼핑에 영향을 주는 중요한 요인임. 농촌 인터넷 쇼핑의 서비스 품질은 양호한 종점 물류 배송과 지원이 필요함. 농촌 이커머스의 발전에 의 하여 농촌 주민들이 서비스의 품질에 대한 기대치도 높아지고 있음. 본 연구에서는 이커머스 만족도를 통한 농촌 종점 물류 서비스 품질이 농촌 주민의 온라인 구매행위에 어떠한 영향 미치는지 검토하고, 농촌 종점 물류 서비스의 발전을 위한 개 선 및 발전전략을 제시하였음. 본 연구에서는 구조방정식모델 (SEM)과 온충린의 매개효과 테스트를 적용하여 분석하였음. 1. 신뢰성과 서비스 편의성은 만족도에 긍정적 영향을 미치며, 원가절약은 만족도에 부정적 영향을 미침. 2. 만족도는 인터넷 쇼핑에 긍정적인 영향을 미치는 것으로 나타났음. 3. 만족도는 반응성과 구매행위 사이에 매개효과가 있고 경제와 구매행위 사이에도 매개효과가 있는 것으로 나타났음. Rural terminal logistics are important determinants of the rural residents' online shopping. The service quality of rural online shopping needs good terminal logistics distribution and support chain. As e-commerce expands to rural areas, residents are gradually increasing their expectations on service quality. Taking satisfaction as an intermediary variable, this study explored influences of various dimensions of rural terminal logistics service quality on rural residents' online purchasing behavior, and provided corresponding improvements and development countermeasures for the development of rural terminal logistics service that would improve the quality of life of rural residents. The structural equation models (SEM) and Zhong Lin Wen’s method of mediating effect test were in the analysis (Wen et al., 2004). Distribution reliability and service convenience had positive effects on satisfaction, while economy had a negative effect on satisfaction. Meanwhile, satisfaction had a positive effect on online purchasing behavior, while satisfaction had a mediator effect between responsiveness and purchase behavior, and a mediator effect was also observed between Economy and purchase behavior.

Hierarchical porous N,S-codoped carbon with trapped Mn species for efficient pH-universal electrochemical oxygen reduction in Zn-air battery

Hao-Yu Wang,Jin-Tao Ren,Chen-Chen Weng,Xian-Wei Lv,Zhong-Yong Yuan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-

Highly efficient and ultrastable nonprecious metal-based electrocatalysts are promising alternatives toplatinum (Pt)-based catalysts in electrocatalyzing oxygen reduction reaction (ORR) process. In thepresent work, nitrogen and sulfur dual-doped hierarchically porous carbon with trapped Mn species(MnNSC-950) was fabricated, which integrates the modulation of the electronic structure for boostedintrinsic activity with the engineering of hierarchical porosity for enriched active sites. The MnNSC-950shows a positive onset potential of 0.95 V and a large limiting current density of 5.4 mA cm 2, which canrival that of the commercial Pt/C catalyst in 0.1 M KOH, together with a robust long-term stability. Moreover, the MnNSC-950 as ORR catalyst in Zn-air battery achieves a high power density of107 mW cm 2 and robust cycling performance over 150 h, exceeding that driven by Pt/C cathode. Theexcellent electrochemical performance is also shown in both neutral and acidic media. This workprovides an enabling route to prepare non-noble metal-based catalysts featuring well-engineeredgeometric and component peculiarities for practical application of energy conversion systems.

Tissue distribution of sialic acid-linked influenza virus receptors in beagle dogs

Zhang-Yong Ning,Xin-Tao Wu,Yan-Fen Cheng,Wen-Bao Qi,Yu-Fu An,Heng Wang,Gui-Hong Zhang,Shou-Jun Li 대한수의학회 2012 Journal of Veterinary Science Vol.13 No.3

Reports of influenza A virus infections in dogs has received considerable attention from veterinarians, virologists, and epidemiologists. Interaction between influenza viral hemagglutinin and cell oligosaccharides containing sialic acid residues results in infection. Sialic acids have an α-2,3-linkage to the penultimate galactose in the avian influenza virus receptor and an α-2,6-linkage in the human receptor. To date,there are no detailed data on the tissue distribution or histological features of either type of sialic acid-linked influenza virus receptors in beagle dogs, which are common laboratory animals and pets. We conducted the current study to visualize the in situ tissue distribution of both sialic acid-linked influenza virus receptors in various organs of beagle dogs using Maackia amurensis lectin II and Sambucus nigra agglutinin. Both α-2,3- and α-2,6-sialic acid-linked receptors were detected in the endothelial cells of the respiratory tract and other organs. Endothelial cells of most gastrointestinal organs were negative for α-2,3-sialic acid-linked receptors in the dogs. Our results suggested that these canine organs may be affected by influenza virus infection. The findings from our study will also help evaluate the occurrence and development of influenza virus infections in dogs.