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Song Lin,Linan Xu,Shuangwen Li,Xuran Liu,Weili Jiang,Xiaolong Jia 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
This paper investigates the progressive damage of filament wound composite tubes embedded within metal joints. Finite element analysis (FEA) modellings were provided through CADWIND filament wound simulation software, and progressive damage analysis of composite tubes was carried out using the Puck criterion under tensile loading. Besides, the ultimate tensile loading of composite tube was carried out. It was found that the inside metal joint extruded the outer composite layers, which resulted in further failure damage of the composite tubes. Furthermore, thickening the composite layer outside metal joint was beneficial to improve the tensile load of the composite tube. Moreover, the numerical results of the FEA provided a reasonably good agreement with the experimental results, which was less than 10 % on the ultimate tensile loading value. Finally, the FEA with the Puck criterion was suitable to predict the progressive damage of filament wound composite tube embedded with metal joints.
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Particle Size Dependent Heavy Metals in Road Dusts from Maanshan City, China
Siping Niu,Xiaolong Song,Jianghua Yu,Xuan Wang,Jianjun Lian 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
In this study the road dusts (RDs) <1,000 μm from Maanshan City, China were characterized from the prospects of size fractionated pollution by heavy metals (HMs). Particulates with size <75 μm, 75 − 125 μm, 125 − 250 μm, 250 − 500 μm and 500 − 1,000 μm averagely accountedfor 35.7±11.7%, 14.6±11.0%, 25.3±12.5%, 11.6±8.8% and 12.8±12.9% of the total weight, respectively. This result implies the gravimetric percentage was overall declined with increasing granular size, following gamma distribution function (p < 0.001). It was observed that the highest contents of Zn, Ni, Pb and Cd occurred with the fine RDs <75 μm while Cu with these <125 μm, suggesting HMs preferred to be associated with the fine particulates. Cu, Zn, Ni, Pb, Cr and Cd were present in RDs with bulk contents of 68±30 mg/kg, 285±122 mg/kg, 23±16 mg/kg, 53±21 mg/kg, 432+297 mg/kg and 0.56±0.39 mg/kg, which resulted in geo-accumulation index (Igeo) values as -1.04, 2.35, -2.38, 0.38, 1.54 and 0.18, respectively. Hence, it can be concluded that the RDs had only been significantly polluted by Zn. Person correlation analysis suggests those HMs ubiquitously present in RDs had size-dependent sources.
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Choi, Byungchul,Jiang, Xiaolong,Kim, Young Kwon,Jung, Gilsung,Lee, Chunhwan,Choi, Inchul,Song, Chi Sung Elsevier 2015 APPLIED ENERGY Vol.146 No.-
<P><B>Abstract</B></P> <P>The objectives of this study are to investigate the effect of diesel fuel blend with n-butanol on the emission of turbocharged common rail direct injection (CRDI) diesel engine and to compare the results with the neat diesel fuel operation case. The blends considered here were blends of diesel fuels with 10% and 20% (by volume) n-butanol. Engine performance and emission characteristics were measured by the European Stationary Cycle (ESC) test. Emissions of HCs, CO, NOx, HCHO, HCOOH and NH<SUB>3</SUB> were measured by Fourier Transform Infrared Spectroscopy (FTIR). Size and number distribution of particulate matter (PM) were measured by the Scanning Mobility Particle Sizer (SMPS). From the results, for the n-butanol blend, NOx emission increased compared with the neat diesel fuel case. At the case of 20% butanol, both THC and CO emissions increased significantly, and both HCHO and HCOOH increased modestly under the low loading of ESC 7, 9 and 11 mode compared with the neat diesel fuel case. Higher blending ratio (>20%) of butanol fuels could contribute to the precursor of PAHs formation such as toluene and benzene in diesel combustion. BU5 blend could be a better option to reduce the PM mass and the emissions of nanosized PM under 50nm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> For the n-butanol blend, NOx emission increased compared with the neat diesel fuel case. </LI> <LI> At the case of 20% butanol, THC and CO emissions increased significantly, and HCHO increased in the low loading conditions. </LI> <LI> Higher blending ratio (>20%) of butanol fuels contributes to the precursor of PAHs formation such as toluene. </LI> <LI> BU5 blend could be a better option to reduce the PM mass and the emissions of nano-sized PM under 50nm. </LI> </UL> </P>
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Propagation Analysis of Polymer Grout in Vertical Fractures: An Experimental and Numerical Study
Meimei Hao,Tao Song,Xiaolong Li,Liangchao Zou,Yanhui Zhong,Bei Zhang,Lianbang Wang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
The use of non-aqueous reactive polymer grouting is a proven technique for preventing gravity erosion in Pisha sandstone through the filling of vertical fracture. However, the diffusion behavior of the polymer grout within vertical fractures remains unclear and requires further investigation for effective grouting design. This study conducts laboratory experiments to examine the effects of grouting quantity on the spread pattern, diffusion distance, and pressure distribution of polymer grout within a visual vertical fracture. The maximum pressure is 6.25 kPa for a grouting quantity of 120 g, 7.5 kPa for 227 g, and reaches about 9.4 kPa for a quantity of 350 g. A numerical model, incorporating time-dependent density and viscosity, is then developed and validated using experimental results. Finally, the influence of initial viscosity 0.05 Pa·s, 0.1 Pa·s, and 0.5 Pa·s on the flow pattern of polymer grout within the vertical fracture is analyzed. The results show that initially gravity causes a dominant downward flow of polymer grout in a vertical fracture. However, as the grout expands due to the chemical reaction, it propagates in all directions. Furthermore, the gravity causing the dominant downward flow of polymer grout decreases with increasing initial viscosity, and the diffusion distance increases in the horizonal direction but decreases in the vertical direction. On this basis, suggestions for optimal grouting hole arrangement are provided to enhance grouting design.
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Coal dust exposure induces proliferation and migration of human bronchial epithelial cells
Li Amin,Zhang Yinci,Wang Ruikai,Xu Ruyue,Ma Yongfang,Song Li,Cao Weiya,Xiaolong Tang 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.2
Background Coal dust exposure has caused a variety of lung diseases. In addition to genotoxicity and cytotoxicity, other biological changes caused by coal dust (CD) exposure need further study. Objective To observe the cellular transformation eff ects of CD exposure and explore its underlying molecular mechanism, human bronchial epithelial cells (BEAS-2B) were cultured with continuous CD exposure. Methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay, colony formation assay, wound healing assay, next-generation sequencing (NGS) and western blotting were performed to observe the cell proliferation, migration, genomic transcription and pathological signaling pathways. Results We demonstrated that BEAS-2B cells with long-term chronic CD exposure show accelerated proliferation rate and enhanced migration ability, and have altered gene expression profi les and aberrant activation of EGFR/Raf/ERK and PI3K/ AKT/mTOR pathways. Conclusions The results indicate that chronic CD exposure could induce abnormal proliferation and migration of BEAS-2B cells, lead to the transformation potential of human bronchial epithelial cells.
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