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- 저자 : Haiqian An (검색결과 5 건)
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Estimation of Maximum Local Scour Depths at Multiple Piles of Sea/bay-Crossing Bridges
Haiqian Han,Yifan Chen,Zhilin Sun 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.2
Estimation methods of local scour depths under complex marine environment have not been well understood for bridge design and constructions. This study focuses on estimating the maximum local scour depth at multiple piles of sea/bay-crossing bridges by developing a new formula using compiled 58 laboratory data and 21 field data. Scale model experiments of three practical bridges in China (Jiashao Bridge, Hangzhou Bay Bridge, and Jintang Bridge) were first conducted, and the results were used to calibrate the proposed universal formula. This formula was developed by using dimensional analysis and considering pile dimension, pile format and type, incoming wave flow condition, wave flow characteristics (acceleration of gravity, density, and dynamic viscosity), and sediment grain size. After the parameters were calibrated, two sets of field measurement data and two independent sets of laboratory testing data of maximum local scour depth were utilized to verify the formula. The results show a relatively good match between the calculated values from the formula and the measured data from the experiment and the field. The new formula is promising to be used to predict the maximum local scour depth at piles for the design of practical sea/bay-crossing bridges in the marine environment.
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A novel semi-IPN hydrogel: Preparation, swelling properties and adsorption studies of Co (II)
Xiaohong Wang,Haiqian Hou,Yujun Li,Yingying Wang,Chen Hao,Cunwang Ge b 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-
A range of super-absorbent semi-IPN hydrogels—polyvinyl alcohol/poly (acrylic acid-co-acrylic amide)(PVA-P(AA-co-AM)) were synthesized via free radical polymerization method under ultrasound-assistedcondition. L16 (45) orthogonal experiments were designed to optimize the synthesis conditions and thesuccess was characterized by FTIR, SEM and TGA. Swelling capacities were studied in various pH solutionand saline solution whose results indicated that pH in solution shows an obvious influence on it and thesalt resistance is greater in salt solution of low valence relative to that of high valence. Meanwhile, itsswelling behavior was evaluated in water solution, which revealed that the swelling process conformedto the Schott model and the diffusion type was non-Fickian diffusion. Moreover, the adsorption on cobalt(II) from aqueous solutions was also investigated in the paper. The optimumpH value was found close to4 for the cobalt (II) adsorption and it was discovered that adsorption kinetics and adsorption isothermsfor cobalt (II) were in accordance with the pseudo-second-order model and the Freundlich modelrespectively. Besides, thermodynamic parameters were calculated for the cobalt (II) adsorption and thefindings revealed that the adsorption behavior is spontaneous and endothermic.
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High-performance ZIF-302 mixed-matrix membranes for efficient CO2 capture
Junfeng Qian,Eryue Song,Haiqian Lian,Jinlong Jiang,Chongqing Wang,Yichang Pan 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
High-performance mixed matrix membranes (MMMs) were developed to assist in controlling global warmingby capturing carbon dioxide (CO2) from moist flue gas. However, the separation performance of MMMs has alwaysbeen limited by gas permeability and long-term operating stability under humid conditions. ZIF-302 is a novel chabazite(CHA) topology structure with hydrophobic ligand. Herein, uniform ZIF-302 nanocrystals were doped into theP84 polymer matrix to synthesize different content of defect-free ZIF-302/P84 MMMs for CO2/N2 separation. A significantcombination of gas permeability and separation factors was found in MMMs with a ZIF-302 packing load of 30wt%. The gas permeability of CO2 and the separation factor of CO2/N2 were significantly increased to 5.2 Barrers and46, respectively, which breaks the trade-off between permeability and selectivity of the polymer membrane. In addition,the long-term operation stability showed that the separation performance of ZIF-302/P84 MMMs for CO2/N2 was maintainedmore than 30 h at 3 bar and 60 oC. The main characteristics of the MMMs prepared in this paper include the combinationof favorable structural stability under humid conditions and unaffected CO2/N2 gas separation performance.
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Rong Wu,Sen Zhou,Minglong Liu,Haiqian An,Zhe Wang,Tianxi Liu 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.3
Purpose: Vascular calcification (VC) is a common complication of end-stage renal disease (ESRD). This study aimed to examinechanges in the expression of miR-21-5p in ESRD patients with VC and to explore its clinical value in predicting the occurrenceand progression of uremic VC. Materials and Methods: 120 ESRD patients were divided into patients without VC group (n=38) and patients with VC group(n=82). All patients were followed up for 2 years to evaluate VC progression. qRT-PCR was used to detect serum miR-21-5p levels. Receiver operating characteristic curves were constructed to assess diagnostic value. Kaplan-Meier and log-rank methods wereutilized to calculate associations between VC progression and risk factors. Results: Serum miR-21-5p levels were significantly higher in ESRD patients with VC than in those without VC and increased progressivelywith increasing disease severity. Serum miR-21-5p levels were able to distinguish patients with VC from those withoutVC, with an area under the curve value of 0.883, a sensitivity of 81.7%, and a specificity of 84.2%. After 2 years of follow-up, miR-21-5p expression had increased in patients with worse VC severity, compared with those with stable VC severity. Patients withhigh miR-21-5p levels were more likely to develop more severe VC, indicating an association between miR-21-5p and VC progression(log-rank p=0.002). Multivariable Cox regression analysis suggested that serum miR-21-5p is an independent predictive factorof VC progression in ESRD patients (hazard ratio=2.064, 95% confidence interval=1.225–3.478, p=0.006). Conclusion: miR-21-5p is overexpressed in the serum of ESRD patients with VC. Our results suggest that overexpression of miR-21-5p is closely associated with VC progression.
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SHUQUAN CHANG,Chengcheng Liu,Heliang Fu,Zheng Li,Xian Wu,Jundong Feng,Haiqian Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
In this study, a double-solvent radiation method is proposed to prepare silver nanoparticles in the pores of metal-organic framework MIL-101(Cr). The results reveal that well-dispersed silver nanoparticles with a diameter of about 2 nm were successfully fabricated in the cages of monodisperse octahedral MIL-101(Cr) with a particle size of about 400 nm. The structure of MIL-101(Cr) was not destroyed during the chemical treatment and irradiation. The resulting Ag/MIL-101 exhibits excellent catalytic performance for the reduction of 4-nitrophenol. This method can be extended to prepare other single or bimetallic components inside porous materials.
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