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RISS 인기검색어
- 검색키워드
- 저자 : Jixiang Xu (검색결과 4 건)
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Jixiang Xu,Jianjun Wang,Jianping Han,Zhaolong Han,Jiahuang Tu,Zhanjie Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4
The aim of this paper is to investigate the bolted end-plate beam to column (BEBC) joints with different strengthening strategies under fire through a parametric study by using a validated computational model. The current studies are mainly more focused on the mechanical behavior of a certain kind of reinforced or unreinforced BEBC joints at either room or fire alone, limiting investigations are available for a comprehensive stiffening strategy study of the BEBC joints under fire. Therefore, there is a need in improving the performance of BEBC joints with different stiffening strategies, the fire resistance comparison of these BEBC joints with different strengthening strategies under fire is of great interest. The analyses of the fire resistance behavior of the stiffened or unstiffened BEBC joints under fire were conducted by using a developed model that was established and validated by using the existing test results. A parametric study was conducted for BEBC joints with web stiffeners, end-plate stiffeners and web and end-plate stiffeners together under fire using the validated computational model. In order to better compare the fire resistance of BEBC joints with different strengthening strategies under a fire, 24 finite element models were established by considering different strengthening strategies and end-plate thicknesses. The results on different strengthening strategies and the end-plate thicknesses revealed the major impact of web stiffeners and end-plate web stiffener together, and the sensitivities of end-plate thickness for unreinforced BEBC joints. For the fire resistance of unreinforced and stiffened BEBC joints, the findings herein can provide a valuable reference for potential design recommendations.
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Preparation of Silica Nanoparticles via Two-Step Process Utilizing Mixed Chlorosilane Residues
Su, Yonghong,Xu, Bugang,Cai, Jixiang,Chen, Liang,Huang, Bing The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.6
We propose an economic and facile method for the preparation of silica nanoparticles through a two-step process utilizing chlorosilane residues. Mixed chlorosilane residue was alcoholized with absolute ethanol as a first step to form tetraethoxysilane (TEOS). The TEOS was then utilized as a silicon source to synthesize silica nanoparticles in a sol-gel method. The alcoholysis process was designed and optimized utilizing the Taguchi experimental design method and the yield of TEOS was as high as 82.2% under optimal synthetic conditions. Similarly, the Taguchi method was also utilized to study the effects of synthesis factors on the particle size of silica nanoparticles. The results of statistical analysis indicate that the concentration of ammonia has a greater influence on particle size compared to the mass fractions of TEOS and polyethylene glycol (4.6% and 9.7%). The purity of the silica particles synthesized in our experiments is high, but the specific surface area and pore volume are small.
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Physiological responses of yellow‑horn seedlings to high temperatures under drought condition
Hua Jin,Jixiang Zou,Linlin Li,Xinlei Bai,Tong Zhu,Junbao Li,Bing-Cheng Xu,Zhi Wang 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.1
Drought and hot stresses are the primary limiting factors for the growth and seed production of yellow-horn (Xanthoceras sorbifolia Bunge), especially in Xinjiang Province of China. A better understanding of its physiological and biochemical characteristics under drought–hot stress is requisite for its efficient cultivation in the arid and semi-arid areas. In this study, the physiological and biochemical responses of 3-month-old yellow-horn seedlings were evaluated after 7 days of treatments of five temperatures (25 °C/20 °C, 30 °C/25 °C, 35 °C/25 °C, 40 °C/25 °C and 45 °C/25 °C) under two watering conditions [adequate water supply (HW): 80 ± 5% FC (field capacity); low water supply (LW): 40 ± 5% FC] by a pot experiment. The increased temperature (above to 35 °C) markedly aggravated the damage on biomass accumulation and membrane integrity of yellow-horn seedlings under the LW. The accumulation of soluble sugars and proteins exhibited a growing trend as the temperature increased from 25 to 40 °C, which declined when the temperature was higher than 40 °C except for the soluble protein accumulation under HW. In addition, captured responsive characteristics of the gas-exchange parameters and chlorophyll fluorescence have indicated that the combinations of high temperature (above to 35 °C) and LW induced significant decrease in photosynthetic activities of yellow-horn seedlings. All these results showed that the hot stress significantly aggravated the drought damage on yellow-horn plant growth, especially when the temperature increased above 35 °C under drought stress.
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Haijun Lu,Shicheng Xu,Dinggang Li,Jixiang Li 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.12
To investigate the shear strength and microstructure of undisturbed loess polluted by landfill leachate, a series of laboratory tests were carried out to determine the shear strength, mineral composition, surface morphology, particle size distribution and pore characteristics of the loess. The stress-strain curve of undisturbed soil polluted by landfill leachate showed typical strain-softening behavior. The deviatoric stress, cohesion and angle of shearing resistance of undisturbed soil decreased at increased landfill leachate concentrations, decreased by 31.03%, 30.01%, respectively. But pore water pressure was positively related to leachate concentrations. The content of primary minerals remained stable, and the content of montmorillonite and illite decreased with increased leachate concentration, reduced by 26.02%, 23.93%, respectively. Soil structure changed into an unstable honeycomb structure when the leachate concentration increased. Moreover, the average particle size decreased by 62.1%, and the specific surface area increased and then stabilized at 500 ~ 650 m2/kg. The soil particles became nonuniform and porous and their sizes gradually decreased. The pore radius of soil mainly ranged from 0.02 μm to 1 μm. The maximum radius and optimal radius of the pore increased when the leachate concentrations increased.
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