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Occurrence of re-adsorption in desorption cycles of capacitive deionization
Qihan Yao,Hao L. Tang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
This research explored the occurrence of re-adsorption that may impose negative impact on electroderegeneration in capacitive deionization (CDI). Among the tested operational modes, polarity reversal wasfound to deliver faster salt desorption than a conventional short circuit and reduction of cell voltage to0.3 V. Earlier occurrence of re-adsorption was observed when the CDI system was operated under ahigher reversed discharge voltage. An optimized polarity reversal at 1.2 V followed by a short circuit isconsidered as a promising approach for efficient CDI operations for practical engineering use.
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Seismic Behavior Investigation on Blind Bolted CFST Frames with Precast SCWPs
Jingfeng Wang,Qihan Shen,Beibei Li 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
To explore seismic behavior of blind bolted concrete-fi lled steel tube (CFST) frames infi lled with precast sandwich composite wall panels (SCWPs), a series tests of blind bolted square CFST frames with precast SCWPs under lateral low-cyclic loading were conducted. The infl uence of the type of wall concrete, wall-to-frame connection and steel brace setting, etc. on the hysteretic curves and failure modes of the type of composite structure was investigated. The seismic behavior of the blind bolted CFST frames with precast SCWPs was evaluated in terms of lateral load–displacement relation curves, strength and stiff ness degradation, crack patterns of SCWPs, energy dissipation capacity and ductility. Then, a fi nite element (FE) analysis modeling using ABAQUS software was developed in considering the nonlinear material properties and complex components interaction. Comparison indicated that the FE analytical results coincided well with the test results. Both the experimental and numerical results indicated that setting the external precast SCWPs could heighten the load carrying capacities and rigidities of the blind bolted CFST frames by using reasonable connectors between frame and SCWPs. These experimental studies and FE analysis would enable improvement in the practical design of the SCWPs in fabricated CFST structure buildings.
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Jingfeng Wang,Qihan Shen,Han Jiang,Xuebei Pan 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
To analyze the axial compressive performance of elliptical concrete-fi lled thin-walled steel tube (ECFTST) columns, fi nite element (FE) modeling was built up by ABAQUS software in this paper. The material nonlinearity and the complex interaction between steel tube wall and core concrete in an elliptical section were considered in this numerical analysis. Failure modes and interaction mechanism of ECFTST stub columns were also studied. Moreover, a modifi ed equivalent circular diameter approach for ellipse feature was proposed to substitute for the constitutive relation of ECFTST columns. The prediction accuracy of this method was verifi ed by the comparison of the FE and test results in terms of failure modes, axial compressive capacities and axial force-axial displacement relation curves. Further, the infl uence of diameter-to-thickness ratio, cross-section slenderness and scale eff ect etc. on the performance of ECFTST stub columns were estimated under axial compressive loading. The results of numerical analysis showed that the axial force-axial displacement curves of the ECFTST stub columns were obviously aff ected by the confi nement factor. Lastly, based on the simple superposition approach and the unifi ed theory approach, two simplifi ed design methods were proposed to predict the axial compressive capacities of ECFTST columns.
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Research on Static Behavior of Stud Shear Connectors after Strong-corrosion Based on Push-out Test
Wenjing Qiao,Qihan Hu,Fan Yang,Haoyun Zhu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
To study the shear bearing performance and failure mechanism of stud shear connectors after strong-corrosion, six groups of stud shear connectors were designed and then welded to the specimen. They are corroded by hydrochloric acid time for 0 h, 2 h, 12 h, 24 h, 48 h, and 72 h. Herein, the loading process, load-slip curve, shear bearing capacity, and failure mode were obtained by the push-out test. The bearing capacity formula was also proposed by the stress mechanism of 84 finite element models. The results of the study on stud shear connectors show that the shear capacity, deformation capacity and slip decrease gradually with the extension of corrosion time. Among them, the enlargement in the diameter exerts considerable influence on their shear capacity. Notwithstanding, the shear bearing capacity slightly increases with stud shear connectors lengthened. The concrete strength grade can strengthen the shear capacity. Finally, the shear bearing capacity formula, taking the reliability coefficient into account, is proposed by the exit test data of 104 stud shear connectors.
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Song Gao,Yingli Sun,Qihan Li,Tonggui He,Jicai Liang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.3
To improve the aerodynamic performance of high-end equipment, the mirror-symmetrically 3D curved aluminum structural parts are increasingly assembled in the manufacturing industry. A new type of multi-points 3D stretch-press-bending (3D SPB) process for forming this kind of component is proposed in this paper. A prototype of this process is developed. The 3D SPB experiments are carried out. This new process realizes the complex bending for multi-directional curvature radius, which increases the material utilization by 6.79% and doubles the production efficiency. Then, the numerical simulation models are established. It has a good prediction result for the 3D springback. The maximum relative error of springback prediction is less than 20%. Besides, the effect of pre-stretching and post-stretching are investigated, which determines the most suitable forming parameters at s pre-stretching and 0.3 s post-stretching. At last, the springback direct compensation method is applied to the precise forming of the target part. Though two times adjustment, the deviation reduces effectively. The precise forming experiment is carried out based on the optimized forming parameters. The maximum total deviation is 1.52 mm, which satisfies the forming requirement. The 3D SPB process achieves the pairwise forming of the W-shaped mirror-symmetric structural parts and improves production efficiency.
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Lei Yang,Lanjie Lei,Qihan Zhao,Ying Gong,Gaopeng Guan,Shaoxin Huang 대한남성과학회 2019 The World Journal of Men's Health Vol.37 No.2
Purpose: This study investigated the role of natriuretic peptide receptor 2 (NPR2) on cell proliferation and testosterone secre-tion in mouse Leydig cells.Materials and Methods: Mouse testis of different postnatal stages was isolated to detect the expression C-type natriuretic peptide (CNP) and its receptor NPR2 by quantitative reverse transcription polymerase chain reaction (RT-qPCR). Leydig cells isolated from mouse testis were cultured and treated with shNPR2 lentiviruses or CNP. And then the cyclic guanosine mono-phosphate production, testosterone secretion, cell proliferation, cell cycle and cell apoptosis in mouse Leydig cells were ana-lyzed by ELISA, RT-qPCR, Cell Counting Kit-8, and flow cytometry. Moreover, the expression of NPR2, cell cycle, apoptosis proliferation and cell cycle related gene were detected by RT-qPCR and Western blot. Results: Knockdown of NPR2 by RNAi resulted in S phase cell cycle arrest, cell apoptosis, and decreased testosterone secre-tion in mouse Leydig cells.Conclusions: Our study provides more evidences to better understand the function of CNP/NPR2 pathway in male reproduc-tion, which may help us to treat male infertility.
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The mixed substructure synthesis method with physics-impedance-modal parameter
Wang, Jianjun,Li, Qihan,Zhu, Zhigen Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.8 No.5
Based on the concept of the parameter-mixed synthesis, this paper presents a mixed formulation of the substructure synthesis method in terms of the physics-impedance-modal parameter. An example is given to show the validity of this method.
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Zhangqiong Huang,Yun Li,Qinfang Jiang,Yixuan Wang,Kaili Ma,Qihan Li 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.3
Background: Mature oocytes at the metaphase II status (MII-stage oocytes) played an important role in assisted reproductive technology in non-human primates. Objectives: In order to improve the proportion of MII-stage oocytes retrieval, three different superovulation protocols were performed on 24 female cynomolgus monkeys. Methods: All the monkeys received once-daily injection of follicle-stimulating hormone (25 international unit [IU]) on day 3 of the menstruation, 3-day intervals, twice daily for 8–12 days until the time of human chorionic gonadotropin (1,500 IU) injection, on the 14–17th day of menstruation collecting oocytes. The difference between protocol I and protocol II was that 0.1 mg the gonadotropin-releasing hormone agonist was injected on day 1 of the menstruation, while the difference between personalized superovulation protocol and protocol II was that oocytes could be collected on the 13–17th day of menstrual cycle according to the length of each monkey. Results: The total number of oocytes harvested using the personalized superovulation protocol was much higher than that using protocol I (p < 0.05), and the proportion of MII-stage oocytes was significantly greater than that from either superovulation protocol I or II (p < 0.001 and p < 0.01 respectively), while the proportion of immature oocytes at the germinal vesicle was less than that from superovulation protocol I (p < 0.05). Conclusions: The personalized superovulation protocol could increase the rate of MII-stage oocytes acquired, and successfully develop into embryos after intracytoplasmic sperm injection, and eventually generated fetus.
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