Welding Performance of Low-Yield-Strength Steel Shear Panel Dampers Under Large Plastic Deformation

Chaofeng Zhang,Shixi Chen,Junhua Zhao,Xuchuan Lin,Lingxin Zhang,Jiajia Zhu,Weili Wang 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.6

Characterized by large plastic deformation and energy-dissipation capacity, low-yield-strength steel shear panel dampers (LYSPDs) are widely used as energy-dissipating members in seismic engineering. However, the eff ect of welding on the properties of LYSPDs remains unclear. Hence, in this study, we investigated the matching performance between low-yieldstrength steel (LYS) and two diff erent welding materials. Subsequently, the quality of welding between LYS and dissimilar metals was investigated. Furthermore, the fracture characteristics of the welding seam of LYS under large plastic deformation were explored. Finally, the welding performance of LYSPDs under large plastic deformation was verifi ed under cyclic loading. The results of this study are signifi cant in terms of the eff ect of welding on the properties of LYSPDs.

Plasmonic colorimetric sensors based on etching and growth of noble metal nanoparticles: Strategies and applications

Zhang, Zhiyang,Wang, Han,Chen, Zhaopeng,Wang, Xiaoyan,Choo, Jaebum,Chen, Lingxin Elsevier 2018 Biosensors & bioelectronics Vol.114 No.-

<P><B>Abstract</B></P> <P>Plasmonic colorimetric sensors have emerged as a powerful tool in chemical and biological sensing applications due to the localized surface plasmon resonance (LSPR) extinction in the visible range. Among the plasmonic sensors, the most famous sensing mode is the “aggregation” plasmonic colorimetric sensor which is based on plasmon coupling due to nanoparticle aggregation. Herein, this review focuses on the newly-developing plasmonic colorimetric sensing mode – the etching or the growth of metal nanoparticles induces plasmon changes, namely, “non-aggregation” plasmonic colorimetric sensor. This type of sensors has attracted increasing interest because of their exciting properties of high sensitivity, multi-color changes, and applicability to make a test strip. Of particular interest, the test strip by immobilization of nanoparticles on the substrate can avoid the influence of nanoparticle auto-aggregation and increase the simplicity in storage and use. Although there are many excellent reviews available that describe the advance of plasmonic sensors, limited attention has been paid to the plasmonic colorimetric sensors based on etching or growth of metal nanoparticles. This review highlights recent progress on strategies and application of “non-aggregation” plasmonic colorimetric sensors. We also provide some personal insights into current challenges associated with “non-aggregation” plasmonic colorimetric sensors and propose future research directions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The strategies for plasmonic colorimetric sensors based on nanoparticles etching/growth are reviewed. </LI> <LI> Highlighted applications in environmental as well as biological analysis are provided. </LI> <LI> The advantages and future directions of this kind of sensing platforms are detailed discussed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Plasmonic colorimetric sensors based on etching and growth of noble metal nanoparticles.</P> <P>[DISPLAY OMISSION]</P>

Evaluation of the gastroprotective effects of 20 (S)-ginsenoside Rg3 on gastric ulcer models in mice

Zhang, Kai,Liu, Ying,Wang, Cuizhu,Li, Jiannan,Xiong, Lingxin,Wang, Zhenzhou,Liu, Jinping,Li, Pingya The Korean Society of Ginseng 2019 Journal of Ginseng Research Vol.43 No.4

Background: Gastric ulcer (GU) is a common gastrointestinal disease that can be induced by many factors. Finding an effective treatment method that contains fewer side effects is important. 20 (S)-ginsenoside Rg3 is a kind of protopanaxadiol and has shown superior antiinflammatory and antioxidant effects in many studies, especially cancer studies. In this study, we examined the treatment efficacy of 20 (S)-ginsenoside Rg3 on GU. Methods: Three kinds of GU models, including an alcohol GU model, a pylorus-ligated GU model, and an acetic acid GU model, were used. Mouse endothelin-1 (ET-1) and nitric oxide (NO) levels in blood and epidermal growth factor (EGF), superoxide dismutase, and NO levels in gastric mucosa were evaluated. Hematoxylin and eosin staining of gastric mucosa and immunohistochemical staining of ET-1, inducible nitric oxide synthase (NOS2), and epidermal growth factor receptors were studied. Ulcer index (UI) scores and UI ratios were also analyzed to demonstrate the GU conditions in different groups. Furthermore, Glide XP from $Schr{\ddot{o}}dinger$ was used for molecular docking to clarify the interactions between 20 (S)-ginsenoside Rg3 and EGF and NOS2. Results: 20 (S)-ginsenoside Rg3 significantly decreased the UI scores and UI ratios in all the three GU models, and it demonstrated antiulcer effects by decreasing the ET-1 and NOS2 levels and increasing the NO, superoxide dismutase, EGF, and epidermal growth factor receptor levels. In addition, high-dose 20 (S)-ginsenoside Rg3 showed satisfactory gastric mucosa protection effects. Conclusion: 20 (S)-ginsenoside Rg3 can inhibit the formation of GU and may be a potential therapeutic agent for GU.

Facile Synthesis of Flower-Like AgI/BiOBr Z-Scheme Nanocomposite with Enhanced Photocatalytic Activity for Degradation of 17α-Estradiol (EE2)

Lingxin Li,Han Li,Yanju Long,Shan Wang,Yu Chen,Sifeng Zhang,Lulu Wang,Lijun Luo,Fengzhi Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1

In the present work, a direct Z-scheme AgI/BiOBr heterojunction displaying improved photocatalytic activity was designed by a chemical bath deposition method. The obtained photocatalysts were systematically characterized through XRD, SEM, XPS, BET and UV-Vis diffuse reflectance spectroscopy. The synthesized AgI/BiOBr photocatalyst displayed superior photocatalytic performance in the case of 17α-ethinylestradiol (EE2), where 97.0% compound has been removed within 9 min of irradiation. The rate constant using AgI/BiOBr photo-catalyst was 16.0 and 138.7 times more than that of pure AgI and BiOBr, respectively. Furthermore, the photocatalytic mechanism was investigated. The results of this study indicated that AgI/BiOBr was a stable and efficient photocatalyst, with promising practical applications.

Evaluation of the gastroprotective effects of 20 (S)-ginsenoside Rg3 on gastric ulcer models in mice

Kai Zhang,Ying Liu,Cuizhu Wang,Jiannan Li,Lingxin Xiong,Zhenzhou Wang,Jinping Liu,Pingya Li 고려인삼학회 2019 Journal of Ginseng Research Vol.43 No.4

Background: Gastric ulcer (GU) is a common gastrointestinal disease that can be induced by many factors. Finding an effective treatment method that contains fewer side effects is important. 20 (S)-ginsenosideRg3 is a kind of protopanaxadiol and has shown superior antiinflammatory and antioxidanteffects in many studies, especially cancer studies. In this study, we examined the treatment efficacy of 20(S)-ginsenoside Rg3 on GU. Methods: Three kinds of GU models, including an alcohol GU model, a pylorus-ligated GU model, and anacetic acid GU model, were used. Mouse endothelin-1 (ET-1) and nitric oxide (NO) levels in blood andepidermal growth factor (EGF), superoxide dismutase, and NO levels in gastric mucosa were evaluated. Hematoxylin and eosin staining of gastric mucosa and immunohistochemical staining of ET-1, induciblenitric oxide synthase (NOS2), and epidermal growth factor receptors were studied. Ulcer index (UI)scores and UI ratios were also analyzed to demonstrate the GU conditions in different groups. Furthermore,Glide XP from Schrödinger was used for molecular docking to clarify the interactions between 20(S)-ginsenoside Rg3 and EGF and NOS2. Results: 20 (S)-ginsenoside Rg3 significantly decreased the UI scores and UI ratios in all the three GUmodels, and it demonstrated antiulcer effects by decreasing the ET-1 and NOS2 levels and increasing theNO, superoxide dismutase, EGF, and epidermal growth factor receptor levels. In addition, high-dose 20(S)-ginsenoside Rg3 showed satisfactory gastric mucosa protection effects. Conclusion: 20 (S)-ginsenoside Rg3 can inhibit the formation of GU and may be a potential therapeuticagent for GU.

Self-centering BRBs with composite tendons in series: Tests and structural an

Qin Xie,Zhen Zhou,Lingxin Zhang 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.3

The self-centering system and yielding energy dissipation system are two main parts of self-centering buckling-restrained braces (SC-BRBs), which have important influences on brace performance. To improve the performance of the two parts, an SC-BRB with composite tendons in series (SC-BRB-CTS) is proposed by introducing a self-centering system in series that can improve the deformation capability of the brace, and the yielding energy dissipation system made of low-yield steel LYP160 with a strong energy dissipation capacity is adopted. The performance of the braces is studied by quasi-static tests, and the influence of the self-centering system in series and low-yield steel on the seismic performance of the structure is determined by nonlinear dynamic analyses and fragility analyses. The results show that the deformation capacity of the SC-BRB-CTS is approximately 44% higher than that of a traditional SC-BRB, and the collapse resistance of the structure is improved by avoiding or delaying tendon fracture. The use of LYP160 steel core plates can substantially improve the energy dissipation capacity and post-yielding bearing capacity of the brace, which is beneficial for reducing the seismic response of the structure.

INFLUENCE OF TIRE BELT LAYER PRESSURE SHARE RATIO ON TIRE CONTOUR AND PERFORMANCE BASED ON NEW NON-NATURAL EQUILIBRIUM CONTOUR THEORY

Liang Chen,Li Han,Yang Jian,Wang Guolin,Zhang Lingxin 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2

Tire contour design theory has always been studied because of its significant effect on tire performance. Based on the new non-natural equilibrium contour theory, the influence of belt pressure share ratio on the carcass contour is studied. The type of 385 / 65R22.5 all-steel radial tire was chosen as the research object and the finite element analysis technique was adopted to calculate the belt pressure share ratio. The results show that with the increase of the belt pressure share ratio, the clamping effect of belt layer on the carcass is strengthened, the curvature of tire crown in carcass contour increases and the crown curve tends to be rounded. The influence of belt pressure share ratio on wear, footprint, rolling resistance and grip performance was also explored with the finite element technology. It turned out that with the increase of the belt pressure share ratio, the tire wear increased, rolling resistance reduced, grip performance enhanced.

Behaviors of UHPC-filled Q960 high strength steel tubes under lowtemperature compression

Jia-Bao Yan,Shunnian Hu,Yan-Li Luo,Xuchuan Lin,Yun-Biao Luo,Lingxin Zhang 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.2

This paper firstly proposed high performance composite columns for cold-region infrastructures using ultra-high performance concrete (UHPC) and ultra-high strength steel (UHSS) Q960E. Then, 24 square UHPC-filled UHSS tubes (UHSTCs) at low temperatures of -80, -60, -30, and 30℃ were performed under axial loads. The key influencing parameters on axial compression performance of UHSS were studied, i.e., temperature level and UHSS-tube wall thickness (t). In addition, mechanical properties of Q960E at low temperatures were also studied. Test results revealed low temperatures improved the yield/ultimate strength of Q960E. Axial compression tests on UHSTCs revealed that the dropping environmental temperature increased the compression strength and stiffness, but compromised the ductility of UHSTCs; increasing t significantly increased the strength, stiffness, and ductility of UHSTCs. This study developed numerical and theoretical models to reproduce axial compression performances of UHSTCs at low temperatures. Validations against 24 tests proved that both two methods provided reasonable simulations on axial compression performance of UHSTCs. Finally, simplified theoretical models (STMs) and modified prediction equations in AISC 360, ACI 318, and Eurocode 4 were developed to estimate the axial load capacity of UHSTCs at low temperatures.