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Hydrodynamic characters of co-current operation for SO_2 absorption in a laboratory packed column
He Jie,,Tianjin University,Jia Man-Ling,Tan Chang-Bin 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.11
A co-current operation for SO_2 absorption by water was performed in a laboratory-scale packed column. The effects of L/V (liquid-gas ratio) and F (gas phase loading factor) on the SO_2 absorptivity were both investigated. The absorptivity for co-current increased with the increase of L/V and the percentage of absorptivity increase at higher L/V is larger. At lower F, in regular packing there is fluctuation of absorptivity with F increased, but in random packing there is not. With the increase of F, the absorption curve slowed down. It is proposed that in order to obtain a steady desulfurization efficiency, F factor in both kinds of packings should be higher than 4 kg^(0.5)/m^(0.5)s. For absorptivity, which could be reached by both co-current and counter-current, it is suggested that co-current is better because of the higher gas velocity.
Experimental study on unconfined compressive strength of rubberized cemented soil
Jie He,Duanwei Guo,Dexin Song,Fangcheng Liu,Lei Zhang,Qifeng Wen 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10
As an economical and environmentally friendly lightweight filler material, rubberized cemented soil has a broad application prospect in engineering. In order to analyze its engineering characteristics, the stress-strain curves were obtained by the unconfined compressive strength test under different compounding conditions, focusing on the changes in rubber particle size, rubber content, cement content, and curing age on the strength of rubberized cemented soil. Results indicate that: we can divide the stress-strain curve of rubberized cemented soil into four stages: compression dense stage, elastic deformation stage, yielding stage, and post-damage stage; the ductility and plasticity change regularly with cement content, rubber content, and rubber particle size; the strength of rubberized cemented soil increases with the increase of cement content and decreases with the increase of rubber content; In the content range of this test, the strength growth rate is the largest at the level of 5% − 10%, and the strength reduction rate is the smallest at 0% − 5% of rubber powder content; the unconfined compressive strength decreases and then increases as particle size grows, reaching its lowest value at 1 − 3 mm, which is considered to be the inferior particle size and the verification of the existence of the optimum particle size; the unconfined compressive strength of rubberized cemented soil has an excellent linear relation with the natural logarithm of the curing age, and its strength increases with the increase of lnT; a new comprehensive characterization parameter PCRT is proposed, which can effectively characterize the effects of rubber content, cement content and curing age on the compressive strength of rubberized cemented soil, and has a good power function relation.
Jie He,Duanwei Guo,Dexin Song,Fangcheng Liu,Lei Zhang,Qifeng Wen 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.5
The authors appreciated the discussants for their suggestions on their recent paper regarding four key topics: the evaluation of the ductility index of rubberized cemented soil, comparative analysis between predicted models and actual results, providing guidance and suggestions for the application of rubberized cemented soil in engineering practice, and evaluating the environmental impact of rubberized cemented soil. These discussions have practical significance and are worth further research in order to contribute to the research and application of rubberized cemented soil.
He-Jie Zhu,Xue-Mei Wang,Xiao-Yong Gao 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
Low-cost synthesis of high-quality ZnS films on silicon wafers is of much importance to the ZnSbased heterojunction blue light-emitting device integrated with silicon. Thus, a series of ZnS films were chemically synthesized at low cost on Si(100) wafers at 353 K under a mixed acidic solution with a pH of 4 with zinc acetate and thioacetamide as precursors and with ethylenediamine and hydrochloric acid as the complexing agent and the pH value modifier, respectively. The effects of the ethylenediamine concentration on the crystallization, surface morphology, and optical properties of the ZnS films were investigated by using X-ray diffractometry, scanning electron microscopy, spectrophotometry, and fluorescence spectroscopy. A mechanism for the formation of ZnS film under an acidic condition was also proposed. All of the ZnS films were polycrystalline in nature, with a dominant cubic phase and a small amounts of hexagonal phases. The crystallization and the surface pattern of the films were clearly improved with increasing ethylenediamine concentration due to its enhanced complexing role. The absorption edge of the films almost underwent a blue shift with increasing ethylenediamine concentration, which was largely attributed to the quantum confinement effects caused by the small particle size of the polycrystalline ZnS films. Defect species and the corresponding strengths of the ZnS films were strongly affected by the ethylenediamine concentration.
Jie He,Lingqia Su,Xiaojun Sun,Jiajia Fu,Jian Chen,Jing Wu 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
A xylanase (XynA) was purified from the culturemedium of Streptomyces sp. FA1, which was previouslyisolated from a bamboo retting system. XynA had amolecular mass of 43 kDa, displayed maximal activity atpH 5.5, retained 41% of its maximal activity at pH 11.0,and was stable over a wide pH range (3.0 ~ 11.0). PurifiedXynA was subjected to peptide mass fingerprinting, whichled to the cloning of the xynA gene. The xynA gene, whichencodes a mature protein of 436 amino acids, washeterologously expressed in E. coli BL21(DE3). The activityin the culture medium could reach 213.5 U/mL, which was11.2-fold higher than that produced by Streptomyces sp. FA1. BLAST searching revealed that full-length XynAshares less than 90% identity with most of its homologues,whereas amino acids 48-436 of the enzyme share 97%identity with an open reading frame encoding a putativefull-length mature xylanase from Streptomyces tendae. Thetruncated xynA gene, xynA48-436, was cloned and expressedin E. coli, however, no xylanase activity could be detectedin the culture medium. Based on these results, it is suggestedthat XynA is a new member of glycoside hydrolasesfamily10 with exceptional catalytic efficiency at alkalinepH.
He, Wentao,Yao, Yong,He, Min,Kai, Zhang,Long, Lijuan,Zhang, Minmin,Qin, Shuhao,Yu, Jie Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
Surface modification of montmorillonite (MMT) with 3-glycidoxypropyl trimethoxysilane (3GTO) in mild methanol/water mixture has been investigated in detail. The influence of reaction conditions (including silane concentration in feed, reaction time and reaction temperature) on the grafting amount and yield of silane, and further on the grafting pattern of silanes was studied by thermogravimetric analysis, elemental analysis, X-ray diffraction (XRD) and BET. Higher silane concentration, longer reaction time and higher reaction temperature are all benefit to higher grafting amount. When the grafting reaction was performed with 3 mmol/g silane concentration, at $90^{\circ}C$ for 24 h, the grafted amount and yield of silane reached 1.4443 mmol/g and 30%, respectively. Based on the XRD and BET data analysis, a speculation that the grafting pattern of silanes was concentration dependence was proposed.
Wentao He,Yong Yao,Min He,Zhang Kai,Lijuan Long,Minmin Zhang,Shuhao Qin,Jie Yu 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
Surface modification of montmorillonite (MMT) with 3-glycidoxypropyl trimethoxysilane (3GTO) in mild methanol/water mixture has been investigated in detail. The influence of reaction conditions (including silane concentration in feed, reaction time and reaction temperature) on the grafting amount and yield of silane, and further on the grafting pattern of silanes was studied by thermogravimetric analysis, elemental analysis, X-ray diffraction (XRD) and BET. Higher silane concentration, longer reaction time and higher reaction temperature are all benefit to higher grafting amount. When the grafting reaction was performed with 3 mmol/g silane concentration, at 90 oC for 24 h, the grafted amount and yield of silane reached 1.4443 mmol/g and 30%, respectively. Based on the XRD and BET data analysis, a speculation that the grafting pattern of silanes was concentration dependence was proposed.
Sheng-jie Xu,Lun Wu,Qi Zhi Liu,Jun Liu,He Wang,Jie-wen Wang,Ting Zhang 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.2
The feeding preference of pear psylla (Cacopsylla chinensis) varies among pear cultivars. To clarify whether leaf structural factors are related to C. chinensis resistance, eleven pear cultivars of three pear species and their hybrids in China were studied. The population size of C. chinensis in plots of different cultivars was investigated, and leaf paraffin sections of each pear cultivar were observed. Correlation analysis results showed that the thickness of palisade tissue (PT) and the thickness ratio (TR) of PT to leaf (L) were the main factors influencing resistance to C. chinensis. The leaves of cultivar Wujiuxiang and those species from France and the USA exhibited the thickest PT and the highest TR; these three cultivars demonstrated much higher resistance to C. chinensis than did the other cultivars. The cultivar Gold Nijisseiki, with a large C. chinensis population size, showed low PT and TR. The findings of this study may provide valuable information to pear growers, experts and scientists regarding plant protection, cultivation and breeding when selecting suitable varieties to culture from the perspective of pest control.