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学者姓名：李冬
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Abstract ：
基于ABAQUS有限元数值计算平台,考虑混凝土材料的非均质性以及钢筋和混凝土的应变率效应,建立了钢筋混凝土(reinforced concrete,RC)梁三维细观数值分析模型,探究了 RC梁在不同应变率和配箍率条件下的剪切性能及其尺寸效应行为.结果表明:剪切承载力随着应变率和配箍率的增加均有不同程度的提高;名义抗剪强度随梁高的增大而减小,存在显著的尺寸效应现象;应变率和配箍率的增大一方面可以提高RC梁的名义抗剪强度,另一方面会削弱名义抗剪强度的尺寸效应行为;提出的RC梁静/动态剪切统一尺寸效应律同时考虑了尺寸效应、应变率效应和配箍率的影响,能够较好地预测RC梁在静态和动态作用下的名义抗剪强度,具有一定的准确性和合理性.
Keyword ：
尺寸效应 尺寸效应 配箍率 配箍率 钢筋混凝土(RC)梁 钢筋混凝土(RC)梁 应变率 应变率 细观模型 细观模型 剪切性能 剪切性能
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| GB/T 7714 | 金浏 , 张江兴 , 李冬 et al. 钢筋混凝土梁动态剪切性能及尺寸效应细观研究 [J]. | 振动与冲击 , 2023 , 42 (8) : 194-205 . |
| MLA | 金浏 et al. "钢筋混凝土梁动态剪切性能及尺寸效应细观研究" . | 振动与冲击 42 . 8 (2023) : 194-205 . |
| APA | 金浏 , 张江兴 , 李冬 , 杜修力 . 钢筋混凝土梁动态剪切性能及尺寸效应细观研究 . | 振动与冲击 , 2023 , 42 (8) , 194-205 . |
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Abstract ：
为了研究在低周往复荷载作用下结构尺寸对方钢管混凝土短柱抗震性能的影响，对6根方钢管混凝土短柱开展了水平往复加载试验，分析了截面尺寸对柱破坏形态、滞回曲线、骨架曲线以及不同抗震性能指标(如刚度退化、耗能能力、延性等)的影响，阐明了不同截面尺寸对柱名义抗剪强度的影响规律和机制，研究结果表明：不同截面尺寸的试件破坏形态基本相同，表现为柱底部钢管鼓曲、核心混凝土被压碎的破坏形态；当截面尺寸由200 mm增至600 mm时，在不同加载方向上，方钢管混凝土短柱名义抗剪强度分别下降了63.1%(59.8%)，表现出显著的尺寸效应；随着截面尺寸增大，相对名义刚度与平均耗能系数呈降低趋势；JIN等提出的考虑尺寸效应的抗剪强度公式计算值与试验值吻合良好，说明考虑尺寸效应的方钢管混凝土柱抗剪承载力计算公式能够较为准确的预测其抗剪承载力。
Keyword ：
名义抗剪强度 名义抗剪强度 抗震性能 抗震性能 试验研究 试验研究 尺寸效应 尺寸效应 方钢管混凝土短柱 方钢管混凝土短柱
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| GB/T 7714 | 金浏 , 梁健 , 李冬 et al. 结构尺寸对方钢管混凝土短柱抗震性能影响的试验研究 [J]. | 工程力学 , 2023 , 40 (4) : 35-45 . |
| MLA | 金浏 et al. "结构尺寸对方钢管混凝土短柱抗震性能影响的试验研究" . | 工程力学 40 . 4 (2023) : 35-45 . |
| APA | 金浏 , 梁健 , 李冬 , 杜修力 . 结构尺寸对方钢管混凝土短柱抗震性能影响的试验研究 . | 工程力学 , 2023 , 40 (4) , 35-45 . |
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Abstract ：
Nano-zero-valent iron (nZVI), as a typical nano-material, has been recently used in wastewater treatment and combination with bioreactors. Using nZVI coupled denitrification system research the effect and influence of nZVI enhanced denitrification sludge on the degradation of toxic compounds and system performance. The nZVI coupled denitrification system showed better resistance to 2,6-DCP impact, and the concentrations of effluent NO2- and NO3- were below 2.0 mg/L. At the same time, the addition of nZVI enabled the denitrification system to quickly adapt to the toxic environment of 2,6-DCP within 15 days, and the degradation efficiency of 2,6-DCP reached 99.9%. The released SMP reduced after nZVI coupled with denitrification sludge in 2,6-DCP environment, which could improve the effluent water quality. Nuclear magnetic resonance spectroscopy showed that the addition of nZVI would change the structure of EPS in denitrification sludge. After 90 days of operation, the dominant bacteria in the denitrifying sludge have undergone great changes. Moreover, Thauera was responsible as the dominant bacteria for degrading 2,6-DCP in the denitrification system. The increased in the proportion of functional bacteria with nitrate_reduction, nitrogen_respiration, nitrate_respiration and nitrite_respiration in the presence of NZVI further reveals the mechanism of enhanced denitrification.
Keyword ：
Nano-zero-valent iron Nano-zero-valent iron Denitrification Denitrification Microbial structure Microbial structure Molecular weight Molecular weight 2,6-dichlorophenol 2,6-dichlorophenol
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| GB/T 7714 | Li, Mingrun , Wei, Dong , Zhang, Zhaoran et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system [J]. | CHEMOSPHERE , 2022 , 287 . |
| MLA | Li, Mingrun et al. "Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system" . | CHEMOSPHERE 287 (2022) . |
| APA | Li, Mingrun , Wei, Dong , Zhang, Zhaoran , Fan, Dawei , Du, Bin , Zeng, Huiping et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system . | CHEMOSPHERE , 2022 , 287 . |
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Abstract ：
本发明提供了基于锈蚀和疲劳荷载同时作用下钢筋混凝土梁粘结性能测试的试验方法及加速锈蚀装置，装置包括—水泵，水泵放置在水槽中，并由定时器控制开关，水槽中放置氯化钠溶液；水泵抽出的溶液由水管连接到待测钢筋混凝土梁粘结区上方；粘结区包裹一圈海绵，海绵外包裹一圈塑料薄膜；待测钢筋混凝土梁中提前预埋一根不锈钢丝，不锈钢丝连接至外部直流电源负极，电源正极连接待测钢筋，待测钢筋上固定有第一位移计、第二位移计、第一应变片、第二应变片。本发明提供的加速锈蚀装置及试验方法，能够客观、准确、简洁的测量锈蚀和疲劳荷载同时作用下钢筋混凝土梁的粘结性能等参数。
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| GB/T 7714 | 吴洁琼 , 桑文龙 , 金浏 et al. 基于锈蚀和疲劳荷载同时作用下钢筋混凝土梁粘结性能测试的试验方法及加速锈蚀装置 : CN202211407939.0[P]. | 2022-11-10 . |
| MLA | 吴洁琼 et al. "基于锈蚀和疲劳荷载同时作用下钢筋混凝土梁粘结性能测试的试验方法及加速锈蚀装置" : CN202211407939.0. | 2022-11-10 . |
| APA | 吴洁琼 , 桑文龙 , 金浏 , 李冬 . 基于锈蚀和疲劳荷载同时作用下钢筋混凝土梁粘结性能测试的试验方法及加速锈蚀装置 : CN202211407939.0. | 2022-11-10 . |
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Abstract ：
本文对CFRP筋混凝土梁-柱节点的剪切破坏行为及其抗剪强度的尺寸效应进行了分析.采用细观数值模拟方法,建立了CFRP筋混凝土梁-柱节点剪切破坏的有限元模型,研究了几何相似的CFRP筋混凝土梁-柱节点细观破坏模式与失效机制,探讨了节点配箍率对CFRP筋混凝土梁-柱节点抗剪强度及其尺寸效应规律的影响.模拟结果表明:CFRP筋混凝土梁-柱节点的名义抗剪强度存在明显的尺寸效应,提高节点配箍率可以削弱抗剪强度的尺寸效应.与钢筋混凝土梁-柱节点抗剪性能对比发现:CFRP筋混凝土梁-柱节点名义抗剪强度的尺寸效应更为明显.基于前期工作中提出的考虑配箍率影响的钢筋混凝土梁-柱节点名义抗剪强度尺寸效应律,结合本文...
Keyword ：
梁-柱节点 梁-柱节点 配箍率 配箍率 细观模拟 细观模拟 抗剪强度 抗剪强度 尺寸效应 尺寸效应 CFRP筋 CFRP筋
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| GB/T 7714 | 金浏 , 万顺寅 , 李冬 et al. 配箍率对CFRP筋混凝土梁-柱节点抗剪强度尺寸效应的影响分析 [J]. | 中国科学:技术科学 , 2022 , 52 (10) : 1484-1494 . |
| MLA | 金浏 et al. "配箍率对CFRP筋混凝土梁-柱节点抗剪强度尺寸效应的影响分析" . | 中国科学:技术科学 52 . 10 (2022) : 1484-1494 . |
| APA | 金浏 , 万顺寅 , 李冬 , 苗丽越 , 杜修力 . 配箍率对CFRP筋混凝土梁-柱节点抗剪强度尺寸效应的影响分析 . | 中国科学:技术科学 , 2022 , 52 (10) , 1484-1494 . |
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Abstract ：
A novel core-shell magnetic composites [Fe3O4@C@FeOx (FCF)] (Fe3O4 as the core and C as the inner shell, FeOx as the outer shell) was prepared by modifying Fe3O4@C magnetic nanoparticles (FC) by amorphous iron oxides to remove As(V) from water. Both the magnetic core (FC) and the amorphous iron oxide shell were all fabricated with Iron-containing water treatment residuals (WTRs), also called iron sludge. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), Brunauer-Emmett-Teller analysis (BET), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM) were utilized to characterize the FC and FCF. TEM images clearly show that FCF is composed of spherical particles with obvious core-shell structure, and the thickness of carbon shell and amorphous iron oxide shell are 20-35 and 30-50 nm, respectively. With saturation magnetization of 16.30 emu/g, FCF nanoparticles could be easily separated from the solution with a hand held magnet. BET analysis show that the specific surface area of FCF is 122.7 m(2)/g, which is conducive to the adsorption of As(V). The adsorption efficiency of FCF for As(V) is high in a wide range of pH 3-9. Moreover, the adsorption process might be a chemical adsorption according to kinetics fitting analysis of FCF. Both Langmuir and Freundlich model could fit the adsorption data for the FCF at 25 degrees C and 35 degrees C well, and the maximum adsorption capacity of FCF (13.47 mg/g) at 25 degrees C is about 3.29 times of that of FC (3.14 mg/g), which may be due to the large amount of amorphous iron oxides coated on the surface of FCF and its large specific surface area. This study not only provides a new way for the disposal of waste iron sludge, but also supplies a cheap and stable adsorbent for the treatment of arsenic-containing water.
Keyword ：
As(V) removal As(V) removal Iron sludge Iron sludge Magnetic adsorbent Magnetic adsorbent
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| GB/T 7714 | Zeng, Huiping , Zhai, Longxue , Qiao, Tongda et al. Removal of As(V) by a core-shell magnetic nanoparticles synthesized with iron-containing water treatment residuals [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2021 , 627 . |
| MLA | Zeng, Huiping et al. "Removal of As(V) by a core-shell magnetic nanoparticles synthesized with iron-containing water treatment residuals" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 627 (2021) . |
| APA | Zeng, Huiping , Zhai, Longxue , Qiao, Tongda , Zhang, Jie , Li, Dong . Removal of As(V) by a core-shell magnetic nanoparticles synthesized with iron-containing water treatment residuals . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2021 , 627 . |
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Abstract ：
Although the chitosan-WTRs particulate adsorbent prepared by embedding method has been proved to have arsenic adsorption capacity, the capacity of it is greatly weakened compared with the original water treatment residuals (WTRs). In this study, WTRs and chitosan were used as raw materials to prepare a new kind of adsorbent beads by a homogeneous method. At the same time, in order to enhance the adsorption capacity and reduce the limitation of kinetics, freeze-drying method was chosen to dry the adsorbent. The WTRs-chitosan beads by homogeneous method (WCB) were characterized by SEM, XRD, XPS and other methods. According to the characterization results, there are regularly arranged pores inside the particles, and the iron in the particles mainly exists in the form of amorphous iron oxyhydroxide. According to the results of batch experiment, the pseudo-second-order kinetic model has a higher degree of fit, indicating that the WCB adsorbs As(V) mainly by chemical adsorption. The maximum adsorption capacity estimated from the Langmuir isotherm model is 42.083 mg/g, which is almost same as the WTRs. Weak acid and neutral conditions are conducive to adsorption, while alkaline conditions have a significant inhibitory effect on arsenic adsorption.
Keyword ：
Water treatment residuals Water treatment residuals Chitosan Chitosan Arsenic removal Arsenic removal
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| GB/T 7714 | Zeng, Huiping , Xu, Ke , Wang, Fanshuo et al. Preparation of adsorbent based on water treatment residuals and chitosan by homogeneous method with freeze-drying and its As(V) removal performance [J]. | INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES , 2021 , 184 : 313-324 . |
| MLA | Zeng, Huiping et al. "Preparation of adsorbent based on water treatment residuals and chitosan by homogeneous method with freeze-drying and its As(V) removal performance" . | INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES 184 (2021) : 313-324 . |
| APA | Zeng, Huiping , Xu, Ke , Wang, Fanshuo , Sun, Siqi , Li, Dong , Zhang, Jie . Preparation of adsorbent based on water treatment residuals and chitosan by homogeneous method with freeze-drying and its As(V) removal performance . | INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES , 2021 , 184 , 313-324 . |
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Abstract ：
Backwashing sludge of groundwater treatments for iron and manganese removal is an effective adsorbent to remove arsenic from water. Still, it isn't easy to apply in practice due to its powder form. A new type of granular adsorbent (GA) was prepared by using this sludge as raw material. GA was prepared by adding a homogeneous solution of iron sludge and chitosan into NH4OH solution with a separatory funnel and pipette tip. GA has a high sorption capacity of 14.95 mg/g As(V) determined by the Langmuir model. And the dynamic filtration experiment was conducted by filling the GA in the plexiglass column. The experimental results show that the adsorption capacity of the filter column increased with the increase of bed depth, while the unit adsorption capacity decreased. When the bed depth was 15 cm, the total and unit adsorption capacities were 10.755 mg and 0.779 mg/g, respectively. In comparison, when the bed depth was 60 cm, the adsorption capacity was 20.405 mg, and the unit adsorption capacity was 0.370 mg/g. When the bed was in the midst of 30, 45, 60 cm, the breakthrough time was 13 h, 100 h, 200 h at EBCT of 9 min, 18 min, and 37 min, respectively. The NaOH solution with a 1% concentration was continuously injected to regenerate the exhausted GA filter column, and the desorption rate reached 25.8%. After regeneration, the adsorption capacity of GA was slightly decreased, and the GA column still had good As(V) removal performance with Re% above 90%. The Thomas, Adams-Bohart, YoonNelson models were used to fit the experimental data, and the Yoon-Nelson model was proved better to describe the breakthrough curves. GA column has a more commendable adsorption capacity compared to some other adsorbents. This study not only resourcefully utilizes waste iron sludge but also represents a step forward in investigating the possibility of extending iron sludge adsorbents from batch to fixed bed adsorption.
Keyword ：
Adsorption Adsorption Arsenic Arsenic Column study Column study Granular adsorbent Granular adsorbent Chitosan Chitosan
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| GB/T 7714 | Zeng, Huiping , Sun, Siqi , Yu, Yaping et al. Column studies on the adsorption of As(V) by granular chitosan adsorbent prepared with backwashing iron-containing sludge [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2021 , 627 . |
| MLA | Zeng, Huiping et al. "Column studies on the adsorption of As(V) by granular chitosan adsorbent prepared with backwashing iron-containing sludge" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 627 (2021) . |
| APA | Zeng, Huiping , Sun, Siqi , Yu, Yaping , Zhang, Jie , Li, Dong . Column studies on the adsorption of As(V) by granular chitosan adsorbent prepared with backwashing iron-containing sludge . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2021 , 627 . |
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Abstract ：
为研究在常温(21±1)℃条件下不同搅拌方式对于厌氧氨氧化污泥复壮及运行影响,采用3组反应器(R1、R2、R3)搅拌方式分别为连续搅拌、间歇搅拌、间歇搅拌方式(R2、R3转速不同),对系统复壮及运行过程的脱氮性能、颗粒污泥性能等进行分析.结果表明,R1、R2、R3分别用10,2,2 d的时间氨氮、亚硝酸盐氮去除率接近100%,R2、R3的厌氧氨氧化速率更高,更适合厌氧氨氧化菌生长;周期实验结果可知,间歇搅拌方式形成的水流流化状态较弱,使反应器呈较低溶解氧的时间较长,更易抑制AOB活性,从而提高厌氧氨氧化菌活性;R1系统提供剪切力大,且持续与基质溶液接触,产生EPS多,稳定运行时期末,R1、R2...
Keyword ：
间歇搅拌 间歇搅拌 厌氧氨氧化活性 厌氧氨氧化活性 周期试验 周期试验 连续搅拌 连续搅拌
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| GB/T 7714 | 李冬 , 曹正美 , 张杰 et al. 不同搅拌方式对厌氧氨氧化污泥复壮及运行影响 [J]. | 哈尔滨工业大学学报 , 2021 , 53 (05) : 1-8 . |
| MLA | 李冬 et al. "不同搅拌方式对厌氧氨氧化污泥复壮及运行影响" . | 哈尔滨工业大学学报 53 . 05 (2021) : 1-8 . |
| APA | 李冬 , 曹正美 , 张杰 , 张诗睿 , 李帅 . 不同搅拌方式对厌氧氨氧化污泥复壮及运行影响 . | 哈尔滨工业大学学报 , 2021 , 53 (05) , 1-8 . |
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Abstract ：
室温下接种成熟的好氧颗粒污泥于由独立的缺氧池和好氧池组成的缺氧/好氧交替连续流系统中,以实际生活污水为进水基质,探究曝气强度和水力停留时间对连续流系统的影响.研究表明在回流比为2,较小的曝气强度(0.6 m L·min~(-1))和适当的水力停留时间(9 h)条件下更有利于污染物的去除,此时TP平均去除率为80.43%,TN平均去除率为83.6%,COD平均去除率为90.39%,污泥浓度为2 100 mg·L~(-1)左右,污泥体积指数保持在50 mL·g~(-1)以下,颗粒粒径在700～800 nm之间.用EEM-PARAFAC模型对不同阶段的EPS表征结果表明,EPS组成成分随着运行参数的...
Keyword ：
平行因子 平行因子 好氧颗粒污泥 好氧颗粒污泥 连续流 连续流 缺氧好氧交替 缺氧好氧交替 脱氮除磷 脱氮除磷 污染物去除模型 污染物去除模型
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| GB/T 7714 | 李冬 , 杨敬畏 , 李悦 et al. 缺氧/好氧交替连续流的生活污水好氧颗粒污泥运行及污染物去除机制 [J]. | 环境科学 , 2021 , 42 (05) : 2385-2395 . |
| MLA | 李冬 et al. "缺氧/好氧交替连续流的生活污水好氧颗粒污泥运行及污染物去除机制" . | 环境科学 42 . 05 (2021) : 2385-2395 . |
| APA | 李冬 , 杨敬畏 , 李悦 , 李帅 , 张诗睿 , 王文强 et al. 缺氧/好氧交替连续流的生活污水好氧颗粒污泥运行及污染物去除机制 . | 环境科学 , 2021 , 42 (05) , 2385-2395 . |
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