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Airbag Damping of the Hollow Fiber Composite with Different Porosity in the Fiber Wall
Mingjun Li,Guoqun Zhou,Yongwen Xu,Guifang Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The inner cavity of the hollow fiber with porosity in its fiber wall constitutes a damping airbag with slow passage of gas. The magnitude of the damping value of the airbag and its damping influencing factors need to be researched, which adds the nonlinear airbag damping to the damping of the raw materials and increases the total damping loss factor of the structure. In this paper, the hollow fiber damping materials with different hollow inside diameters, different fiber wall thicknesses, different wall porosity and different wall pore structure were prepared by adjusting and controlling the technological parameters of the hollow fiber spinning and the formula of spinning casting solution. Meanwhile, we have a comprehensive study on the relationship between the factors and performances. It was found and confirmed that the size of the airbag, the wall pore structure, the wall porosity and the wall thickness of the airbag were the most crucial parameters, which can affect the additional damping of the airbag in the hollow fiber. And the controlling method of the four key parameters was also obtained. Finally, the mechanism and effect of hollow fiber airbag damping was proved.
A Novel Algorithm for Green Citrus Detection based on the Reticulate Grayladder Feature
Mingjun Wang,Jun Zhou,Weiyan Shang,Rufu Hu,Xuefeng Wang,Liang Gong 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.10
Immature green citrus fruit detection using conventional color images is a challenging task due to fruit color similarity with the background, partial occlusion, varying illumination and shape irregularity. Therefore, most existing green fruits detection algorithms, which use color as the main discriminant feature, have a low recognition rate and a high rate of false positives. In this manuscript, we developed a novel Green Citrus fruit Detection algorithm based on the proposed Reticulate Grayladder Feature (GCDRGF), which contained 4 major steps: First, an 8-graylevel image was generated by the preprocessing steps of median filtering, histogram-based equalization and 8-graylevel discretization of the input raw image. Secondly, reticulate grayladders were obtained by a multidirectional scanning on the 8-graylevel image, and rule-based pseudo-grayladder removal strategies were used to remove false positives of target grayladders. Thirdly, grayladder clustering and fruit location fitting were used to generate candidate regions for target fruits. Finally, majority voting was performed to determine the results of candidate regions based on the analysis of apparent features and recticulate grayladders within candidate regions. The experimental results proved the effectiveness of the proposed reticulate grayladder feature and the corresponding detection algorithm with respect to various illuminant and imaging conditions. Compared with the existed eigenfruit algorithm, our algorithm has a higher rate of successful recognition and a lower rate of false positives, which helps to greatly improve the productivity of robotic operations.
Tang, Lijun,Zhou, Pei,Qi, Zhikai,Huang, Zhenlong,Zhao, Jia,Cai, Mingjun Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A new quinoline-based acylhydrazone (1) has been synthesized and applied as a fluorescent probe. Probe 1 exhibits high selectivity and sensitivity to $Cu^{2+}$ with fluorescence "ON-OFF" behavior in HEPES buffered (1‰ DMSO, HEPES 20 mM, pH = 7.4) solution. The on-site generated 1-$Cu^{2+}$ complex displays excellent selectivity to sulfide ions with fluorescence "OFF-ON" performance through copper displacement approach.
Short-Term Wind Speed Forecast Based on Least Squares Support Vector Machine
Wang, Yanling,Zhou, Xing,Liang, Likai,Zhang, Mingjun,Zhang, Qiang,Niu, Zhiqiang Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.6
There are many factors that affect the wind speed. In addition, the randomness of wind speed also leads to low prediction accuracy for wind speed. According to this situation, this paper constructs the short-time forecasting model based on the least squares support vector machines (LSSVM) to forecast the wind speed. The basis of the model used in this paper is support vector regression (SVR), which is used to calculate the regression relationships between the historical data and forecasting data of wind speed. In order to improve the forecast precision, historical data is clustered by cluster analysis so that the historical data whose changing trend is similar with the forecasting data can be filtered out. The filtered historical data is used as the training samples for SVR and the parameters would be optimized by particle swarm optimization (PSO). The forecasting model is tested by actual data and the forecast precision is more accurate than the industry standards. The results prove the feasibility and reliability of the model.
Tang, Lijun,Zhou, Pei,Huang, Zhenlong,Zhao, Jia,Cai, Mingjun Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
Fluorescent and colorimetric recognition properties of 2-(4-N-phenyl-3-thiosemicarbazone)-8-hydroxyquinoline (1) in buffered aqueous solution (1% DMSO, HEPES 20 mM, pH = 7.4) have been examined. Sensor 1 displays highly selective and sensitive recognition to $Cu^{2+}$ with fluorescence "ON-OFF" performance. The in situ formed 1-$Cu^{2+}$ complex exhibits an excellent selectivity toward sulfide ions with fluorescence "OFF-ON" behavior via $Cu^{2+}$ displacement approach. Thus, relay recognition of $Cu^{2+}$ and sulfide by a known molecule 1 has been achieved.
XINLIN LIU,Yingying Qin,Mingjun Zhou,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1 g CdS/Fe3O4/rGO photocatalyst into 20 mg/L tetracycline for 2 h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that e? was the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.
Pengwei Huo,Yanfeng Tang,Mingjun Zhou,Jinze Li,Zhefei Ye,CHANGCHANG MA,Longbao Yu,Yongsheng Yan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
ZnWO4-CdS heterostructure photocatalysts have been successfully synthesized by hydrothermalmethod with assembling CdS on the surface of ZnWO4. The obtained composite photocatalysts werecharacterized by X-ray diffraction, transmission electron microscopy, Raman, thermo-gravimetricanalysis, UV–vis diffuse reflectance spectroscopy, photoluminescence and photocurrent measurement. The results show that the interface between ZnWO4 and CdS is well formed, and the CdS nanoparticlesare uniformly distributed onto ZnWO4 nanorods which could facilitate charge transfer and reducerecombination of photo-generated electrons and holes. Compared with pure ZnWO4 and CdS, the aspreparedheterostructure photocatalysts exhibit excellent photostability and photodegradation abilityof ciprofloxacin (CIP) under visible light irradiation.
Li-Jun Tang,Pei Zhou,Zhikai Qi,Zhenlong Huang,Jia Zhao,Mingjun Cai 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
A new quinoline-based acylhydrazone (1) has been synthesized and applied as a fluorescent probe. Probe 1 exhibits high selectivity and sensitivity to Cu2+ with fluorescence “ON-OFF” behavior in HEPES buffered (1‰ DMSO, HEPES 20 mM, pH = 7.4) solution. The on-site generated 1-Cu2+ complex displays excellent selectivity to sulfide ions with fluorescence “OFF-ON” performance through copper displacement approach.
Oxidation of Zhundong subbituminous coal by Fe2+/H2O2 system under mild conditions
Shuai Chen,Wei Zhou,Mingjun Liu,Guangbo Zhao,Qingxi Cao,Bojun Zhao,Kaikai Kou,Jihui Gao 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Oxidation of coal under mild conditions is effective not only to understand the macromolecular network structure of coal but also to produce useful chemicals, allowing more efficient application of coal resources. In this work, the mild oxidation of Zhundong subbituminous coal (ZS) by Fe2+/H2O2 system was carried out under various conditions, including [Fe2+]/[H2O2] molar ratio, temperature, H2O2 concentration and oxidation time. The liquid oxidation products were analyzed using gas chromatography/mass spectrometry (GC/MS), and the chemical structure changes were studied using Fourier transform infrared spectroscopy (FTIR). The results suggest that the oxidation efficiency of ZS with H2O2 is enhanced with the aid of Fe2+. The optimum conditions were determined to be [Fe2+]/[H2O2] molar ratio of 0.00453, H2O2 concentration of 3mol/L, 60 oC and 4 h according to the oxidation conversion rate. In total, 25 compounds were identified, which could be categorized as six group components. Most of them are valuedadded chemicals, and the content of benzene carboxylic acids is the highest among them, making up 29.99% of all group components in total relative content (TRC). -CH2- should be primary bridge connecting the aromatic rings, and alkylene chains linking three aromatic rings are abundant in ZS.
Pengwei Huo,Jingru Guan,Mingjun Zhou,CHANGCHANG MA,XINLIN LIU,Yongsheng Yan,Shouqi Yuan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
Carbon quantum dots (CQDs)/CdSe/reduced graphene oxide (rGO) was fabricated by hydrothermalmethod. The structures, optical and electronic properties of as-obtained photocatalysts were analyzed bytransmission electron microscopy (TEM), X-ray diffraction (XRD) and photoelectrochemical testing. Thephotocatalytic performances were investigated by degradation of tetracycline hydrochloride (TC HCl). The results showed CQDs modified CdSe loaded rGO could effectively remove TC HCl, the CdSe modifiedwith 7 mL CQDs showed higher photocatalytic degradation rate; the 5 wt% loaded rGO for CQDs/CdSeshowed highest photocatalytic activity. The photocatalytic mechanism exhibited OH, O2and 1O2radicals play key roles