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- 저자 : Gangqiang Wang (검색결과 5 건)
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Ultimate Lateral Bearing Capacity and Group Effect of Belled Wedge Pile Groups
Gangqiang Kong,Huaifeng Peng,Hongyu Qin,Lehua Wang,Yongdong Meng 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.12
Pile foundation of ports, high-voltage transmission line tower are subjected to amount of lateral loading, prediction on lateral bearing capacity is one of the most important projects in structure design. This paper pertains to the model tests on pile-soil interaction of single pile, 2 × 1 and 2 × 2 belled wedge pile groups embedded in sand under lateral load. The load versus displacement, and the soil pressures along depth surrounding piles are measured, the ultimate lateral bearing capacities and group effects of belled wedge piles are analyzed and discussed. An simplified theoretical calculation method on predicting the lateral bearing capacities of shaped pile groups with considering group pile p-y curves, and longitudinal cross-section variation are proposed. The accuracy and reliability of this developed calculation method are verified through the comparative analysis with model test results obtained in this study and previous literature. The predicted values of lateral bearing capacities have suitable agreement with the measured data. It also shows that the ultimate lateral bearing capacities of belled wedge pile group are nearly 1.8 − 2.0 times of those of traditional belled pile with the same concrete usage in this study’s condition.
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Qianqian Wang,Gangqiang Zhang,Lin Zhang,Ping Zhu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7
Sodium alginate (SA) is a renewable material with broad application prospects in textiles, medicine, and otherfields. However, the disadvantage of poor strength and brittleness limited its future application. In this work, the SA wasreinforced by the hydroxypropyl methyl cellulose (HPMC) with a semi-interpenetrating network which leverages thefavourable properties. The structure and surface morphology of SA/HPMC blend membranes after Ca ion cross-linking wereexamined by FTIR, Raman, XRD and SEM. The mechanical properties and water absorbency of the blend membranes werealso studied. The results indicated that the hydrogen bond was found in SA/HPMC blend membranes, which improved theSA/HPMC blend membranes stability. Compared with calcium alginate membrane, the tensile strength and elongation atbreak of SA/HPMC blend membranes were improved to 57 % and 400 %, respectively.
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Zhao, Xiongjie,Wang, Chao,Yuan, Gangqiang,Ding, Haiyuan,Zhou, Liyi,Liu, Xiaogang,Lin, Qinlu Elsevier 2019 Sensors and actuators. B Chemical Vol.290 No.-
<P><B>Abstract</B></P> <P>Lysosomal pH plays an essential role in mediating various biological processes such as immunization, cell metabolism and enzyme activity. Herein, by utilizing the fluorescence resonance energy transfer (FRET) strategy, a two-photon (TP) ratiometric fluorescent probe (NpLys-pH) has been developed for tracking of lysosomal pH changes in living cells, tissues, and zebrafish. NpLys-pH was constructed by conjugating a pH turn-on TP fluorophore <B>1</B> (D-π-A-structured naphthalene derivative) with a pH turn-off naphthalimide fluorophore <B>2</B> <I>via</I> a non-conjugated linker. Meanwhile, NpLys-pH has two potential pH response sites that modulate the fluorescence signal by ICT and PET, respectively. The FRET process exists between the TP fluorophore <B>1</B> and naphthalimide fluorophore <B>2</B>. In addition, NpLys-pH respond to pH rapidly and reversibly with high selectivity and sensitivity and has been applied for tracking lysosomal pH changes in living cells, tissues and zebrafish. We expect that the new probe present here can prompt the development of a wide variety of TP ratiometric fluorescent probes which can find application in detecting other important analytes in biological systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A FRET-based TP ratiometric probe for tracking of lysosome pH changes. </LI> <LI> It has a pH turn-on donor and a pH turn-off acceptor. </LI> <LI> NpLys-pH possesses two well-resolved emission peaks separated by 115 nm. </LI> <LI> It successfully tracked lysosome pH changes in live cells, tissues, and zebrafish. </LI> </UL> </P>
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Lateral Load Distribution for Hollow Slab Bridge: Field Test Investigation
Yu Zhao,Xiaozhe Cao,Yongjun Zhou,Gangqiang Wang,Ruixin Tian 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.3
Distribution factors (DFs) for one typical cross-section as specified in the AASHTO LRFD specification can be varied when the bridge parameters such as span length, loading lanes and skew are changed. The diversity between design and actual DFs may be varied as the bridge parameters changed. To study this diversity, this paper presents an evaluation of lateral load DFs for prefabricated hollow slab bridges. The response of the bridge was recorded during the field test. This field test was divided into two stages: a concentrated force loading test on the prefabricated girder that settled on the bridge supports before the girders were connected transversely and a vehicle loading test after the girders were connected transversely. The instruments used to record the response of the bridge were strain gauges and dial indicators. The measured data in the multi-stages of the field test could be used to calibrate the support condition of the bridge and transverse connection between adjacent girders in the finite element model (FEM) using beam and plate elements. From the FEM, DFs for this hollow slab bridge were determined and compared with the DFs in the AASHTO LRFD specification. A parametric study using the calibrated FEM was then used to investigate the effect of various parameters including span length, skew and bridge deck thickness on the DFs. It was found that AASHTO LRFD specification is conservative compared with the analysis in the FEM, while this conservatism decreased as the span length and skew of the hollow slab bridge increased.
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