Experimental Study and Numerical Analysis on Heavy-Duty Cast Steel Universal Hinged Supports for Large Span Structures

Yuyin Wang,Chao Gong,Sumei Zhang,Haishan Guo 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.1

Heavy-duty cast steel universal hinged supports are gaining increasing usage in modern large-span structures, offering extremely large individual load carrying capacity and universal rotation ability which is preferable to release temperature effects and to improve force conditions of lower structures. This paper presents a full-scale experimental study and elastic-plastic finite element (FE) analysis on the performance of an innovative heavy-duty cast steel support. The support is composed of three main components, i.e. an upper one, a lower one and an intermediate rotation pad. External loads are designed to be passed and transferred through the contact interaction of the three casting parts. The support studied in this paper is expected to possess a higher capacity than existing supports while having the ability of universal rotation under heavy loads. Three full-scale static experiments corresponding to three typical load cases (i.e. tension-shear load case, compression-shear load case, and sheartension load case, respectively) have been carried out employing a multifunctional loading device. A three-dimensional FE model was developed using the commercial software ANSYS, considering the contact behavior between the support components and accounting for both material and geometrical nonlinearities. The model was validated against the experimental results reported in this paper. The performance of this support was evaluated in accordance with a Chinese national code ‘Technical specification for application of connections of structural steel casting (CECS 235:2008)’. This study concluded that this type of support performs well and that it could be used for realistic applications.

Hysteretic Behavior of Reinforced Concrete Columns Confined By Square Steel Tubes.

Xiaoyong Wang(왕소용),Sumei Zhang(장수메이),Lee, Han-Seoung(이한승) 한국콘크리트학회 2006 한국콘크리트학회 학술대회 논문집 Vol.2006 No.5

Characterization of P450 monooxygenase gene family in the cotton aphid, Aphis gossypii Glover

Zhao Likang,Wang Chuanpeng,Gao Xue-ke,Luo Jun-yu,Zhu Xiang-zhen,Wan Sumei 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2

Cytochrome P450 monooxygenases play an important role in the biosynthesis and detoxification of endogenous compounds. In this study, we analyzed a number of P450 genes through transcriptome-wide and genome analyses in Aphis gossypii Glover, the most notorious cotton pests. A total of 49 CYP-putative sequences were identified and classified into 13 families and 21 subfamilies. We identified a putative P450 motif (FXXGXXXCXG), and further analyzed other conserved sequences, which indicate that forty-seven of the fortynine genes seem to be functional, but one is likely non-functional and one is predicted pseudogenes. We found that P450-encoding genes are conserved in gene structure and organization (number, position, and phase of introns) in cotton aphids. The size, transcription orientation, and comparison with other insects of the cotton aphid P450 family suggested that it has evolutionary differentiation. The distribution across the genome and phylogenetic clustering analysis indicated past occurrence of gene duplication events. These results may provide valuable clues for understanding the evolution of the aphid genome, studying the functions of P450s in cotton aphid, and further selecting candidate genes for novel insect control methods.

Fluorine-Doped Graphene/Nanosized Carbide-Derived Carbon Composites for High-Performance Supercapacitor

Pengtao Yan,Lei Yan,Sumei Zhao,Zhen Zuo,Xiaoxu Wang,Chenglin Wang,Meiling Hou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8

A graphene-based composite with high electrochemical performance for supercapacitor applications is fabricated by introducing nanoscale carbide-derived carbon (NCDC) into the fluorine-doped graphene (FG). The incorporation of fluorine can increase the specific capacitance of graphene by providing more pseudocapacitance, whereas the introduction of NCDC into the FG/NCDC composite offers high specific surface area (SSA) (up to 1317 m2 g -1) and hierarchical pore structure, resulting in an enhanced electric double layer capacitance. Due to the synergistic effect of pseudocapacitance and electric double layer capacitance, the specific capacitance of FG/NCDC composite can reach 321 F g -1 at a scan rate of 5 mV s -1 in aqueous electrolyte. Notably, the specific capacitance of the FG/NCDC composite is very stable during long-term cyclic tests, with no significant degradation after 10,000 cycles. Due to its excellent supercapacitive performance, the FG/NCDC composite can be considered as a promising electrode material for high-performance supercapacitors.

Experimental Investigation into In-plane Stability of Concrete-Filled Steel Tubular Parabolic Arches Under Five-Point Concentrated Loads

Qing Hu,Changyong Liu,Changchun Yuan,Yuyin Wang,Sumei Zhang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6

This paper deals with experimental investigations into in-plane stability of fi xed concrete-fi lled steel tubular (CFST) parabolic arches. Three CFST arches with the same span but diff erent rise-to-span ratios were tested under fi ve-point symmetrical concentrated loads over the full span. All applied loads were controlled in synchronization. The test results show that the test arches buckled in an antisymmetric failure mode and the section positions with the maximum deformation were slightly diff erent for three test arches. It is found that the bearing capacity of CFST arches decreased signifi cantly with the decline of rise-to-span ratios, and the outer steel tube provided signifi cant confi nement eff ects on the core concrete after the load reaches 80% of the load-carrying capacity. Moreover, comparisons between the test and fi nite element results indicate that the existing beam-element modeling method can predict the in-plane stability performance of CFST arches very well.

In-Plane Stability of Concrete-Filled Steel Tubular Parabolic Truss Arches

Changyong Liu,Qing Hu,Yuyin Wang,Sumei Zhang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4

For determining the in-plane buckling resistance of a concrete-fi lled steel tubular (CFST) arch, the current technical code GB50923-2013 specifi es the use of an equivalent beam-column method which ignores the eff ect of rise-to-span ratio. This may induce a gap between the calculated result and actual stability capacity. In this study, a FE model is used to predict the buckling behavior of CFST truss arches subjected to uniformly distributed loads. The infl uence of rise-to-span ratio on the capacity of truss arches is investigated, and it is found that the stability capacity reduces as rise-to-span ratio declines. Besides, the calculations of equivalent slenderness ratio for diff erent truss sections are made to consider the eff ect of shear deformation. Moreover, based on FE results, a new design equation is proposed to predict the in-plane strength of CFST parabolic truss arches under uniformly distributed loads.

Study on Pollen Viability, Longevity and Pistil Receptivity of Self-Compatible Chrysanthemum with Small Inflorescences

Hongbo Zhao,Fadi Chen,Yanfang Wang,Weimin Fang,Sumei Chen,Weiming Guo 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Effects of Selenizing Modification on Characteristics and Antioxidant Activities of Inonotus obliquus Polysaccharide

Yang Hu,Shanyi Shi,Lu Lu,Chunying Teng,Sumei Yu,Xin Wang,Min Yu,Jinsong Liang,Juanjuan Qu 한국고분자학회 2017 Macromolecular Research Vol.25 No.3

Excessive reactive oxygen species is implicated in the etiology and pathology of many acute and chronic diseases. Selenium acts as an antioxidant and stimulates the creation of more antioxidants. Selenizing modification polysaccharides potentiate the physiological and pharmacological activities of selenium and polysaccharide. In this study, Inonotus obliquus polysaccharide (IOP) extracted from cultured mycelia was modified into Se-IOP by HNO3- Na2SeO3 method. The characteristics and antioxidant activity of IOP and Se-IOP were comparatively investigated. The result showed that polysaccharide content of purified IOP was 98.9%. The selenium content of Se-IOP was 0.71 mg/g. Both IOP and Se-IOP were homogeneous polysaccharides with a molecular weight of 37.354 and 28.071 kDa, respectively depicted in high performance gel permeation chromatogram (HPGPC). Moreover, both IOP and Se- IOP were composed of Man, Glu, and Gal with a molar ratio of 7.7:32.6:23.3 and 8.3:32.1:22.7, respectively determined by high performance liquid chromatography (HPLC). The characteristic absorption peak of O-Se-O, Se=O and C-O-Se appeared at 1026.75, 772.82, and 652.29 cm-1 respectively in FT-IR spectrum of Se-IOP indicating the success of selenylation. NMR spectrum further confirmed the anomeric carbon signals and chemical shifts in IOP and Se-IOP. These variations induced by selenylation may lead to a higher antioxidant activity of Se-IOP on scavenging hydroxyl, 2,2-diphenyl-1-picryl-hydrazyl (DPPH) and superoxide radical than that of IOP. Furthermore, Se- IOP treatment could also reduce oxidant damage by decreasing the level of malondialdehyde (MDA) and increasing the activities of superoxidedismutase (SOD) and GSH-Px in mice.

High-performance Zinc-Tin-Oxide thin film transistors based on environment friendly solution process

Qian Zhang,Guodong Xia,Lubin Li,Wenwen Xia,Hong-Yu Gong,Sumei Wang 한국물리학회 2019 Current Applied Physics Vol.19 No.2

Zinc-Tin-Oxide (ZTO) thin films were fabricated using a simple and eco-friendly sol-gel method and their application in thin film transistors (TFTs) was investigated. Annealing temperature has a crucial influence on the structure and electrical properties of sol-gel ZTO thin films. The ZTO thin films annealed at 300–600 °C revealed smooth and uniform surfaces with amorphous state, in addition, a high optical transparency over 90% of the ZTO films in the visible range was obtained. The electrical performance of ZTO TFTs showed obvious dependence on annealing temperature. The ZTO TFTs annealed at 500 °C showed a high carrier mobility of 5.9 cm2 /V, high on/off current ratio (Ion/off) of 106 -107 , and threshold voltage (Vth) of 1.03 V. To demonstrate the application of sol-gel ZTO films in low-power display fields, we also fabricated ZTO TFTs with a solution-processed high-permittivity (high-k) ZrTiOx dielectric layer. The ZTO/ZrTiOx TFTs showed high mobility of 17.9 cm2 /V and Ion/off of 105 -106 at a low operation voltage of 3 V, indicating that Indium-free ZTO thin films would be potential candidates for low cost, high performance oxide TFT devices.