Vortex-Induced Vibration Characteristics and Equivalent Static Force Calculation Method of Circular Steel Hangers on Arch Bridge

Xinyu Xu,Yingliang Wang,Xingyu Chen,Xiaolong Zheng,Yongping Zeng 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.4

In order to study the vortex-induced vibration (VIV) characteristics and equivalent static force calculation method of circular steel hangers on the arch bridge, a numerical simulation model of VIV was established using FLUENT software, and the reliability of the model was verified by wind tunnel tests. Effects of wind speed, damping ratio, initial tension and slenderness ratio on the VIV characteristics of circular steel hanger were investigated. Furthermore, the equivalent static force calculation formula and loading range of hanger considering VIV were presented. The results show that with the hanger’s damping ratio decreasing, the maximum amplitude and the lock-in wind speed range increases gradually, while the wind speed and frequency of VIV at the maximum amplitude were not significantly affected. As the initial tension increases or the slenderness ratio decreases, the frequency of VIV increases, and the wind speed corresponding to the maximum amplitude increases, however the maximum vibration amplitude has few changes. Based on a number of numerical analyses on VIV characteristics of hangers, the equivalent static force calculation method is put forward. The equivalent static force calculation method could provide a reference for the design and static analysis of the circular steel hangers.

CO2-responsive smart wormlike micelles based on monomer and “pseudo” gemini surfactant

Xuepeng Wu,Yongping Huang,Sisi Fang,Caili Dai,Hao Li,Zhongliang Xu,Mingwei Zhao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-

CO2-responsive wormlike micelles based on monomer erucic acid 3-(N,N-dimethylamino)propylamide (EADP) with or without sodium salicylate (NaSal) in aqueous solution were studied and compared with “pseudo” gemini system. The “pseudo” gemini system were formed by a mixture of EADP and maleic acid (MA) with molar ratio between 2:1–1:1. Different morphological transformations of microstructures in response to EADP concentrations, additives and CO2 stimuli were further investigated in these systems, the wormlike micelle or vesicles can be obtained. The mechanism of these transitions were further investigated by rheology, cryo-TEM and DFT calculation, the results showed that the mechanism behind this transition involved reversible reaction of CO2 with EADP. The mechanism in this research may give further evidence to the self-assembly of CO2-responsive surfactants.

Protective efficacy of a novel multivalent vaccine in the prevention of diarrhea induced by enterotoxigenic Escherichia coli in a murine model

Hong Zhao,Yongping Xu,Gen Li,Xin Liu,Xiaoyu Li,Lili Wang 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.1

Background: Enterotoxigenic Escherichia coli (ETEC) infection is a primary cause of livestock diarrhea. Therefore, effective vaccines are needed to reduce the incidence of ETEC infection. Objectives: Our study aimed to develop a multivalent ETEC vaccine targeting major virulence factors of ETEC, including enterotoxins and fimbriae. Methods: SLS (STa-LTB-STb) recombinant enterotoxin and fimbriae proteins (F4, F5, F6, F18, and F41) were prepared to develop a multivalent vaccine. A total of 65 mice were immunized subcutaneously by vaccines and phosphate-buffered saline (PBS). The levels of specific immunoglobulin G (IgG) and pro-inflammatory cytokines were determined at 0, 7, 14 and 21 days post-vaccination (dpv). A challenge test with a lethal dose of ETEC was performed, and the survival rate of the mice in each group was recorded. Feces and intestine washes were collected to measure the concentrations of secretory immunoglobulin A (sIgA). Results: Anti-SLS and anti-fimbriae-specific IgG in serums of antigen-vaccinated mice were significantly higher than those of the control group. Immunization with the SLS enterotoxin and multivalent vaccine increased interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) concentrations. Compared to diarrheal symptoms and 100% death of mice in the control group, mice inoculated with the multivalent vaccine showed an 80% survival rate without any symptom of diarrhea, while SLS and fimbriae vaccinated groups showed 60 and 70% survival rates, respectively. Conclusions: Both SLS and fimbriae proteins can serve as vaccine antigens, and the combination of these two antigens can elicit stronger immune responses. The results suggest that the multivalent vaccine can be successfully used for preventing ETEC in important livestock.

Performance Assessment of InSAR-Based Vertical Displacement Monitoring of Sluices in Coastal Soft Soil Area

Xing Yang,Dongmei Wang,Yongping Xu,Miao Hou,Zhihuan Wang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1

Sluices are main flood control infrastructures in coastal areas, where soft rock and soft soil are widely distributed. In soft soil areas, the vertical displacement of sluice is common, which is the main factor affecting the sluice safety. So, it is very important for sluice safety control according to the prototypical observations on deformation. Considering some drawbacks of leveling, such as it can only provide a limited number of points and requires time-consuming field work, this paper evaluates the performance of Interferometric Synthetic Aperture Radar (InSAR)-based method in monitoring long-term vertical displacement deformations of sluices.Taking 12 sluices in Northern Jiangsu, China as an example, 129 Sentinel-1 C-band VV-polarizatio ascending SAR images that span the period from April 2015 to January 2020 were used to monitor their vertical displacement deformations. The leveling results are made to verify the accuracy and reliability of Permanent Scatterer InSAR (PSInSAR) method. The validation indicates good agreement between PSInSAR results and leveling results. Considering the higher accuracy of leveling, PSInSAR method is more suitable as an auxiliary technology besides leveling method to focus on the early warning of sluice deformation risk events.

Construction of the π-complexation desulfurization adsorbent containing Cu+ at defective sites of UiO-66

Yachun Ren,Yueyang Xu,Erjian Huang,Peng Zhang,Yongping Zeng 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-

Adsorption desulfurization is a very effective method to remove thiophenic compounds from fuels. The metal–organic frameworks (MOFs) have emerged as a new type of desulfurization adsorbents because of their porous nature and large specific surface area. In this study, Cu2+ was covalently introduced into the UiO-66 framework at the defective sites by the solvothermal method. Further, the π-complexation adsorbent UiO-66-Cu(I) containing Cu+ for adsorption desulfurization was synthesized by the methanol vapor-induced reduction. The adsorption performance was tested for the removal of thiophene from the model fuels with different sulfur concentrations. In comparison with the pristine UiO-66, the adsorbent UiO-66-Cu(I) has a higher adsorption capacity for thiophene, reaching 14.8 mg S/g. The competitive adsorption results indicated that UiO-66-Cu(I) has good selectivity for thiophene in the presence of aromatic compounds. From the recycling experiments, this adsorption still has the 86 % of the initial capacity after four cycles, indicating that the adsorbent has a good recycling performance.

Novel-integrated process for production of bio-organic fertilizer via swine manure composting

Yan Chen,Xiaoyu Li,Shuying Li,Yongping Xu 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.2

The traditional method of producing bio-organic fertilizer contains two consecutive composting stages which, however, is time-consuming and requires high input of energy and cost. This study attempted to combine two consecutive stages into one single step. Paenibacillus polymyxa, as an antagonistic strain to control anthracnose in Chinese Pakchoi, was used as inoculum to obtain bio-organic fertilizers through two approaches: two consecutive stages (TCS) composting as control and the proposed one step through (OST) composting. The resulting two bio-organic fertilizers produced by TCS and OST were tested for the disease incidence and disease resistant index, and the fertility on growth of Chinese Pakchoi. The results of relative abundance of P. polymyxa showed no significant difference between two kinds of bio-organic fertilizers in phylum, family and genus. The disease incidence of bio-organic fertilizers produced by OST and TCS reduced by 61.40% and 68.42%, respectively, as compared to the control group, where the difference was not significant. The growth promoting effect was remarkable, although the difference in the fertility on the growth was not significant. Compared with the traditional TCS method, the novel OST method could improve efficiency of bio-organic fertilizer production by 42.86% per year according to this study.

miR-182-5p Inhibits NKAPL Expression and Promotes the Proliferation of Osteosarcoma

Shen Yang,Kaixi Chen,Kun Cao,Shenglin Xu,Chengxiao Ma,Yongping Cai,Yong Hu,Yejin Zhou 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.5

Purpose Osteosarcoma, a malignant bone tumor, has the lowest survival rate among all pediatric cancers. NF-κB-activating protein-like (NKAPL) is highly homologous with NKAP. The expression of NKAPL is downregulated in primary liver cancer and breast cancer, and plays a role of tumor suppressor gene. However, the role of NKAPL in osteosarcoma has not been reported. Materials and Methods We explored the effect of NKAPL on the proliferation of osteosarcoma cells by immunohistochemical, RT-PCR, Western blot, and double luciferase reporter gene analysis. Results The low expression of NKAPL mRNA was correlated with distant metastasis (P = 0.017), tumor size (P = 0.023), and clinical stage (P < 0.001). The NKAPL expression level in MG63 and U2OS cells was lower than that in Nhost cells. Downregulation of NKAPL expression in Nhost cells could promote cell proliferation and upregulation of NKAPL expression in MG63 and U2OS cells could inhibit cell proliferation. miR-182-5p expression was negatively correlated with NKAPL mRNA expression (R2 = 0.1169, P = 0.0099). After upregulating NKAPL expression, the Notch1, hes1, hey2, and cyclin D1 expression levels were significantly decreased, with G0/G1 phase arrest and G2/M phase reduction. Conclusions miR-182-5p targeted NKAPL and inhibit NKAPL expression in osteosarcoma. miR-182- 5p could regulate cell cycle and promote tumor proliferation through upregulating Notch signaling pathway.

Stochastic Optimization of Multipath TCP for Energy Minimization and Network Stability over Heterogeneous Wireless Network

( Zulfiqar A. Arain ),( Xuesong Qiu ),( Lujie Zhong ),( Mu Wang ),( Xingyan Chen ),( Yongping Xiong ),( Kiran Nahida ),( Changqiao Xu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.1

Multipath Transport Control Protocol (MPTCP) is a transport layer protocol that enables multiple TCP connections across various paths. Due to path heterogeneity, it incurs more energy in a multipath wireless network. Recent work presents a set of approaches described in the literature to support systems for energy consumption in terms of their performance, objectives and address issues based on their design goals. The existing solutions mainly focused on the primary system model but did not discourse the overall system performance. Therefore, this paper capitalized a novel stochastically multipath scheduling scheme for data and path capacity variations. The scheduling problem formulated over MPTCP as a stochastic optimization, whose objective is to maximize the average throughput, avoid network congestion, and makes the system more stable with greater energy efficiency. To design an online algorithm that solves the formulated problem over the time slots by considering its min-drift-plus penalty form. The proposed solution was examined under extensive simulations to evaluate the anticipated stochastic optimized MPTCP (so-MPTCP) outcome and compared it with the base MPTCP and the energy-efficient MPTCP (eMPTCP) protocols. Simulation results justify the proposed algorithm's credibility by achieving remarkable improvements, higher throughput, reduced energy costs, and lower-end to end delay.

Microstructure analysis of pressure resistance seal welding joint of zirconium alloy tube-plug structure

Feng Gang,Lin Jian,Yang Shuai,Zhang Boxuan,Wang Jiangang,Yang Jia,Xu Zhongfeng,Lei Yongping 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11

Pressure resistance welding is usually used to seal the connection between the cladding tube and the end plug made of zirconium alloy. The seal welded joint has a direct effect on the service performance of the fuel rod cladding structure. In this paper, the pressure resistance welded joints of zirconium alloy tube-plug structure were obtained by thermal-mechanical simulation experiments. The microstructure and microhardness of the joints were both analyzed. The effect of processing parameters on the microstructure was studied in detail. The results showed that there was no β-Zr phase observed in the joint, and no obvious element segregation. There were different types of Widmanst¨atten structure in the thermo-mechanically affected zone (TMAZ) and heat affected zone (HAZ) of the cladding tube and the end plug joint because of the low cooling rate. Some part of the grains in the joint grew up due to overheating. Its size was about 2.8 times that of the base metal grains. Due to the high dislocation density and texture evolution, the microhardnesses of TMAZ and HAZ were both significantly higher than that of the base metal, and the microhardness of the TMAZ was the highest. With the increasing of welding temperature, the proportion of recrystallization in TMAZ decreased, which was caused by the increasing of strain rate and dislocation annihilation

Effect of Red Pepper (Capsicum frutescens) Powder or Red Pepper Pigment on the Performance and Egg Yolk Color of Laying Hens

Li, Huaqiang,Jin, Liji,Wu, Feifei,Thacker, Philip,Li, Xiaoyu,You, Jiansong,Wang, Xiaoyan,Liu, Sizhao,Li, Shuying,Xu, Yongping Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.11

Two experiments were conducted to study the effects of red pepper (Capsicum frutescens) powder or red pepper pigment on the performance and egg yolk color of laying hens. In Exp. 1, 210, thirty-wk old, Hy-line Brown laying hens were fed one of seven diets containing 0.3, 0.6, 1.2, 2.0, 4.8 or 9.6 ppm red pepper pigment or 0.3 ppm carophyll red. Each diet was fed to three replicate batteries of hens with each battery consisting of a row of five cages of hens with two hens per cage (n = 3). In Exp. 2, 180, thirty-wk old, Hyline Brown laying hens, housed similarly to those in Exp. 1, were fed an unsupplemented basal diet as well as treatments in which the basal diet was supplemented with 0.8% red pepper powder processed in a laboratory blender to an average particle size of $300{\mu}m$, 0.8% red pepper powder processed as a super fine powder with a vibrational mill ($44{\mu}m$) and finally 0.8% red pepper powder processed as a super fine powder with a vibrational mill but mixed with 5% $Na_2CO_3$ either before or after grinding. A diet supplemented with 0.3 ppm carophyll red pigment was also included (n = 3). In both experiments, hens were fed the red pepper powder or pigment for 14 days. After feeding of the powder or pigment was terminated, all hens were fed the basal diet for eight more days to determine if the dietary treatments had any residual effects. In Exp. 1, there were no differences in egg-laying performance, feed consumption or feed conversion ratio due to inclusion of red pepper pigment in the diet. Average egg weight was higher (p<0.05) for birds fed 1.2, 2.4 or 9.6 ppm red pepper pigment than for birds fed the diet containing 0.3 ppm red pepper pigment. On d 14, egg color scores increased linearly as the level of red pepper pigment in the diet increased. In Exp. 2, feeding red pepper powder did not affect egg-laying performance, feed consumption or feed conversion ratio (p>0.05). However, compared with the control group, supplementation with all of the red pepper powder treatments increased egg weight (p<0.05). All the red pepper powder treatments also increased (p<0.05) the yolk color score compared with the control. The results of the present study suggest that both red pepper powder and pigment are effective feed additives for improving egg yolk color for laying hens.