Experimental Study and Fine-Tuned Simulation of Cable-Joint Pair Slipping in the Cable-Supported Structure

Renzhang Yan,Chunling Yan,Shuai Wang,Chongsheng Cheng,Ting Liu,Hongbo Liu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1

During the tensioning process of the cable-supported structure, the sliding friction between cable wires and joint will have a great influence on the mechanical properties of the structure. However, due to the complex structure of the cable and the combined action of bending deformation and large pre-tension at the cable-strut joint, it is difficult to accurately determine the coefficient of sliding friction (CSF) between cable wires and joint, and thus the overall mechanical properties of the structure cannot be accurately evaluated. Based on the twisting characteristics of the cable, this paper establishes a friction-slip test model and a refined numerical model to carry out detailed study of the mechanical behavior of contact between cable wires and joint during the tensioning process. Firstly, combined with the calculation results of contact mechanics, it is finds that the stress distribution at straight and curved sections of the cable are non-uniform along its axis and each cross section, and the non-uniformity coefficient of the internal force distribution of the cable is further quantified. At the same time, the local bending of the cable will intensify the uneven stress distribution in the circumferential direction of the cable. The non-uniformity of stress reveals the contact working mechanism of the cable-joint pair. Then, the change of the prestress loss between cable wires and joint with the tensioning process is analyzed, and the parametric analysis is conducted to reveal the effect of the cable included angle, tensile force, and lay length on the CSF. The results find that the prestress loss increases approximately linearly with the increase of tension force and decreases with the increase of the cable included angle, but the CSF is less affected by the lay length during the tensioning process. Finally, a method for valuing the CSF of the cable-supported structure is developed.

CO2-responsive Pickering emulsion stablized by modified silica nanoparticles: A dissipative particle dynamics simulation study

Yan Wang,Hongbing Wang,Chunling Li,Shuangqing Sun,Songqing Hu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

Dissipative particle dynamics (DPD) simulations were applied to investigate the effect of SiO2nanoparticles (SNPs) modified with different tertiary amine chain length and concentration on O/Wemulsion properties, the influence mechanism was also revealed from the molecular level. On this basis,the influence of the modified SNPs volume fraction in the emulsion system was studied. The resultsshowed that with the increase number of tertiary amine chain alkyl carbon, the stability of the originalemulsion system wasfirst enhanced and then weakened while the responsiveness of the protonatedemulsion system wasfirst weakened and then slightly enhanced, the number of tertiary amine chainsmodified on SNPs has the same influence rule on emulsion performance, which was determined by thehydrophobicity of modified SNPs. In addition, with the increase of the modified SNPs volume fraction inthe emulsion system, the stability of the emulsion is gradually enhanced. However, when the volumefraction of SiO2 exceeds 3%, the amplitude of stability enhancement decreases. The increase in theinteraction energy between oil droplets in the equilibrium process is caused by emulsion fusion, which inturn is affected by SNPs. The repulsive force between oil and water is greater than that between two oildrops, which is the reason for the oil drop fusion. The presence of SNPs can reduce the repulsive forcebetween oil and water to different degrees, thus slowing down the fusion of emulsion.

Image Reconstruction Based on Deep Learning for the SPIDER Optical Interferometric System

Yan Sun,Chunling Liu,Hongliu Ma,Wang Zhang 한국광학회 2022 Current Optics and Photonics Vol.6 No.3

Segmented planar imaging detector for electro-optical reconnaissance (SPIDER) is an emerging technology for optical imaging. However, this novel detection approach is faced with degraded imaging quality. In this study, a 6 × 6 planar waveguide is used after each lenslet to expand the field of view. The imaging principles of field-plane waveguide structures are described in detail. The local multiplesampling simulation mode is adopted to process the simulation of the improved imaging system. A novel image-reconstruction algorithm based on deep learning is proposed, which can effectively address the defects in imaging quality that arise during image reconstruction. The proposed algorithm is compared to a conventional algorithm to verify its better reconstruction results. The comparison of different scenarios confirms the suitability of the algorithm to the system in this paper.

Tunable stability of oil-containing foam systems with different concentrations of SDS and hydrophobic silica nanoparticles

Shuangqing Sun,Yan Wang,Congtai Yuan,Hongbing Wang,Wendong Wang,Jianhui Luo,Chunling Li,Songqing Hu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

Experiment and molecular dynamics simulation were carried out to study the tunable stability of oilcontainingSDS-stabilized Nitrogen-in-water foam. The experimental results show that the foam stabilitycould be tuned by the concentrations of SDS and modified SiO2 nanoparticles. In the foam systems with alow SDS concentration (0.2 wt.%), the foams show poor stability and the foam stability was almost notaffected by the addition of modified SiO2 nanoparticles. The foam stability was greatly improved atmoderate SDS concentration (0.5 wt.%), it enhancedfirst and then weakened with the increase ofmodified SiO2 concentration, and the half-life time achieved a maximum value of 1292 s at 0.05 wt.%modified SiO2. However, at high SDS concentration (0.8 wt.%), the foam stability was pretty good exceptfor when the modified SiO2 concentration is too high (>0.2 wt.%). The microscopic mechanism wasobtained by investigating the structural and dynamic properties of the foamfilm. The simulation workshowed consistent results of foam stability with the experimental results. Moreover, it also revealed thatthe concentration and configuration of SDS will affect its interaction with SiO2 and oil molecule, which iscritical to foam stability.

Long supplementary light duration under same daily light integral provided by white plus blue light-emitting diodes improves quality of greenhouse-grown tomato seedlings

Li Xin,Wang Chunling,Liu Jiawei,Guo Yu,Cheng Fei,Yang Yanjie,Yan Zhengnan 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.6

Optimizing light conditions is critical for plant growth and seedling production in greenhouse, especially in seasons when the sunlight is insuffi cient. In the present study, tomato ( Solanum Lycopersicum cv. Fenbeibei) seedlings were grown at two levels of supplementary light duration of 6 h·d − 1 (short) (07:00–10:00 and 15:00–18:00) or 12 h·d − 1 (long) (04:00–10:00 and 15:00–21:00) provided by white light-emitting diodes (LEDs, white long and white short, WL and WS) or combinations of white and blue LEDs (white & blue long and white & blue short, WBL and WBS) with same supplementary daily light integral (at 5.5 mol m − 2 d − 1 ) after sowing, and tomato seedlings grown under sunlight only were set as the control. The per centages of light intensity provided by white and blue LEDs under the WB treatments were 85% and 15%, respectively. The results indicated that tomato seedlings grown under WBL treatment exhibited the lowest plant height and shortest hypocotyl length, which was decreased by 34.6% and 41.8%, respectively, compared with the control. The chlorophyll a, chlorophyll b, and total chlorophyll contents of tomato seedlings grown under WBL were signifi cant higher than those under other treat ments. The root fresh weight, root dry weight, and the stem fi rmness of the greenhouse-grown tomato seedlings under WBL were increased by 21.5%, 41.2%, and 38.6%, compared with those grown under WBS, respectively. The sucrose content of tomato seedlings under WBL was increased by 60.4%, compared with that under WL. In conclusion, 12 h·d − 1 supplementary light provided by combinations of white and blue LEDs led to compact morphological characteristics, superior mechanical properties, and satisfactory growth performance. Our fi ndings provide an available lighting strategy to obtain the desired morphological and quality properties of tomato seedlings grown in the seasons with insuffi cient light.

Ameliorative effects of atractylodin on intestinal inflammation and co-occurring dysmotility in both constipation and diarrhea prominent rats

Yu, Changchun,Xiong, Yongjian,Chen, Dapeng,Li, Yanli,Xu, Bin,Lin, Yuan,Tang, Zeyao,Jiang, Chunling,Wang, Li The Korean Society of Pharmacology 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.1

Intestinal disorders often co-occur with inflammation and dysmotility. However, drugs which simultaneously improve intestinal inflammation and co-occurring dysmotility are rarely reported. Atractylodin, a widely used herbal medicine, is used to treat digestive disorders. The present study was designed to characterize the effects of atractylodin on amelioration of both jejunal inflammation and the co-occurring dysmotility in both constipation-prominent (CP) and diarrhea-prominent (DP) rats. The results indicated that atractylodin reduced proinflammatory cytokines TNF-${\alpha}$, IL-$1{\beta}$, and IL-6 in the plasma and inhibited the expression of inflammatory mediators iNOS and NF-kappa B in jejunal segments in both CP and DP rats. The results indicated that atractylodin exerted stimulatory effects and inhibitory effects on the contractility of jejunal segments isolated from CP and DP rats respectively, showing a contractile-state-dependent regulation. Atractylodin-induced contractile-state-dependent regulation was also observed by using rat jejunal segments in low and high contractile states respectively (5 pairs of low/high contractile states). Atractylodin up-regulated the decreased phosphorylation of 20 kDa myosin light chain, protein contents of myosin light chain kinase (MLCK), and MLCK mRNA expression in jejunal segments of CP rats and down-regulated those increased parameters in DP rats. Taken together, atractylodin alleviated rat jejunal inflammation and exerted contractile-state-dependent regulation on the contractility of jejunal segments isolated from CP and DP rats respectively, suggesting the potential clinical implication for ameliorating intestinal inflammation and co-occurring dysmotility.

Ameliorative effects of atractylodin on intestinal inflammation and co-occurring dysmotility in both constipation and diarrhea prominent rats

Changchun Yu,Yuan Lin,Yong-jian Xiong,Da-peng Chen,Yanli Li,Bin Xu,Zeyao Tang,Chunling Jiang,Li Wang 대한약리학회 2017 The Korean Journal of Physiology & Pharmacology Vol.21 No.1

Intestinal disorders often co-occur with inflammation and dysmotility. However, drugs which simultaneously improve intestinal inflammation and cooccurring dysmotility are rarely reported. Atractylodin, a widely used herbal medicine, is used to treat digestive disorders. The present study was designed to characterize the effects of atractylodin on amelioration of both jejunal inflammation and the co-occurring dysmotility in both constipation-prominent (CP) and diarrheaprominent (DP) rats. The results indicated that atractylodin reduced proinflammatory cytokines TNF-α, IL-1β, and IL-6 in the plasma and inhibited the expression of inflammatory mediators iNOS and NF-kappa B in jejunal segments in both CP and DP rats. The results indicated that atractylodin exerted stimulatory effects and inhibitory effects on the contractility of jejunal segments isolated from CP and DP rats respectively, showing a contractile-state-dependent regulation. Atractylodininduced contractile-state-dependent regulation was also observed by using rat jejunal segments in low and high contractile states respectively (5 pairs of low/ high contractile states). Atractylodin up-regulated the decreased phosphorylation of 20 kDa myosin light chain, protein contents of myosin light chain kinase (MLCK), and MLCK mRNA expression in jejunal segments of CP rats and down-regulated those increased parameters in DP rats. Taken together, atractylodin alleviated rat jejunal inflammation and exerted contractile-state-dependent regulation on the contractility of jejunal segments isolated from CP and DP rats respectively, suggesting the potential clinical implication for ameliorating intestinal inflammation and co-occurring dysmotility.