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学者姓名：李晓阳
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Abstract ：
课程是人才培养的核心要素,课程质量直接决定人才培养质量。为深入推进课堂教学改革,本文以理论力学课程的教学改革和实践为研究平台,结合学生的高阶思维能力培养和课程目标的高阶性设计思路,讨论了理论力学课程高阶性建设的思路和实践。通过构建"1+4+N"的课堂教学体系,梳理课程知识点,将教与学相统一。并以点的合成运动为例,分析了课程高阶性建设的实施路径和策略,从而为提高人才培养质量进行的课程教育教学改革提供一些思路和借鉴。
Keyword ：
高阶思维 高阶思维 课堂教学 课堂教学 理论力学 理论力学
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| GB/T 7714 | 叶红玲 , 杨庆生 , 刘赵淼 et al. 理论力学课程教学高阶性建设的探索与实践 [J]. | 力学与实践 , 2020 , 42 (04) : 489-494 . |
| MLA | 叶红玲 et al. "理论力学课程教学高阶性建设的探索与实践" . | 力学与实践 42 . 04 (2020) : 489-494 . |
| APA | 叶红玲 , 杨庆生 , 刘赵淼 , 李晓阳 . 理论力学课程教学高阶性建设的探索与实践 . | 力学与实践 , 2020 , 42 (04) , 489-494 . |
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Abstract ：
Biofilm nitrification and activated sludge denitrifying phosphorus removal performance were investigated in the pre-A2 NSBR system, which treated real low carbon to nitrogen (C/N) ratio domestic sewage. The effect of organic substance and NO2 --N concentration on the biofilm nitrification performance, and different electronic acceptors on the denitrifying phosphorus uptake rate were studied. Results indicated that nitrification rate was 11.3 mgNH4 +-N/(L•h), the ammonia volume loading was 0.27 kgNH4 +-N/(m³•d) under the filling rate of 40%, the nitrification performance was inhibited by organic substance, but the system showed a good nitrification rate of 9.72 mg NH4 +-N/(L•h) when organics presented. NO2 --N treatment exhibited little effect on the AOB activity but obvious effect on the NOB activity, the NOB activity was almost completely inhibited (only 1.63%) when NO2 --N concentration was 400mg/L. According to the phosphorus uptake rate experiment under different electronic acceptors, the phosphorus uptake rate under oxygen and NO3 --N was 17.62mg P/(g VSS•h) and 12.94mg P/(g VSS•h), respectively, anoxic phosphate accumulating organisms (PAOs) occupied 73.4% of the total PAOs, phosphorus uptake performance was inhibited when the NO2 --N concentration was 30mg/L, and phosphorus uptake performance was inhibited when the NO2 --N concentration was 15mg/L under the condition of NO2 --N and NO3 --N coexisted. © 2019, Editorial Board of China Environmental Science. All right reserved.
Keyword ：
Denitrifying phosphorus removal; Low C/N ratio; Nitrification; NO2 --N inhibition; Pre-A2NSBR process Denitrifying phosphorus removal; Low C/N ratio; Nitrification; NO2 --N inhibition; Pre-A2NSBR process
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| GB/T 7714 | Zhao, W.-H. , Li, J.-W. , Wang, M.-X. et al. Nitrification and denitrifying phosphorus removal performance in the pre-A2 NSBR system [前置A2NSBR系统硝化和反硝化除磷的特性] [J]. | China Environmental Science , 2019 , 39 (11) : 4660-4665 . |
| MLA | Zhao, W.-H. et al. "Nitrification and denitrifying phosphorus removal performance in the pre-A2 NSBR system [前置A2NSBR系统硝化和反硝化除磷的特性]" . | China Environmental Science 39 . 11 (2019) : 4660-4665 . |
| APA | Zhao, W.-H. , Li, J.-W. , Wang, M.-X. , Huang, Y. , Feng, Y. , Li, X.-Y. et al. Nitrification and denitrifying phosphorus removal performance in the pre-A2 NSBR system [前置A2NSBR系统硝化和反硝化除磷的特性] . | China Environmental Science , 2019 , 39 (11) , 4660-4665 . |
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Abstract ：
The effective inhibition or wash-out of nitrite oxidizing bacteria (NOB) is the key challenge for the application of partial nitritation/anammox (PA/N) process in domestic wastewater treatment. The deteriorated domestic wastewater PN/A system was used to investigate the recovery effect of hydroxylamine (NH2OH) concentration and dosing mode on it. The nitrate (NO3 --N) production ratio of the PN/A system was 0.90, which was due to the overgrowth of NOB. The results showed that when the initial NH2OH concentration was 10mg/L in the sequencing batch reactor (SBR) and NH2OH was added once a day, the ratio of NO3 --Nproducted/NH4 +-Nconsumed was decreased from 0.90 to 0.11 after adding NH2OH for 20d. It indicated that NH2OH (10mg/L) addition could restore PN/A process in-situ. The ratio of NO3 --Nproducted/NH4 +-Nconsumed increased to 0.15 again after stopping NH2OH addition for 59d. When continued to add NH2OH into reactor for 5d, the PN/A process operated well. Therefore, the intermittent addition of NH2OH strategy could maintain the stable performance of the PN/A process. The real-time quantitative PCR results showed that the NOB abundance was decreased continuously from (4.52±0.44)×1010copies/g VSS (Day 6) to (2.30±0.80)×109copies/g VSS (Day 157) after NH2OH (10mg/L) addition. It indicated that NH2OH addition was beneficial to inhibit and wash out NOB. © 2019, Editorial Board of China Environmental Science. All right reserved.
Keyword ：
Demostic wastewater; Hydroxylamin (NH2OH); NOB; Partial nitritation/anammox (PN/A) Demostic wastewater; Hydroxylamin (NH2OH); NOB; Partial nitritation/anammox (PN/A)
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| GB/T 7714 | Li, J. , Li, X.-Y. , Zhang, Q. et al. In-situ restoring demostic wastewater partial nitritation/anammox (PN/A) process by addition of hydroxylamine [投加羟胺原位恢复城市污水短程硝化-厌氧氨氧化工艺] [J]. | China Environmental Science , 2019 , 39 (7) : 2789-2795 . |
| MLA | Li, J. et al. "In-situ restoring demostic wastewater partial nitritation/anammox (PN/A) process by addition of hydroxylamine [投加羟胺原位恢复城市污水短程硝化-厌氧氨氧化工艺]" . | China Environmental Science 39 . 7 (2019) : 2789-2795 . |
| APA | Li, J. , Li, X.-Y. , Zhang, Q. , Peng, Y.-Z. . In-situ restoring demostic wastewater partial nitritation/anammox (PN/A) process by addition of hydroxylamine [投加羟胺原位恢复城市污水短程硝化-厌氧氨氧化工艺] . | China Environmental Science , 2019 , 39 (7) , 2789-2795 . |
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Abstract ：
To explore the effects of different alkalinity substances (Na2CO3, KHCO3, NaHCO3) and concentration ranges (2000, 3000, 4000mg/L (as CaCO3)) on the middle-temperature anaerobic digestion system, a static batch semi-continuous stirred tank was used in the experiment. The comprehensive reactor operation and microbial high-throughput sequencing analysis showed that Na2CO3 could promote the hydrolysis and acidification process in three different types of alkalinity, while NaHCO3 was more prominent in gas production and reduction. It indicated that Na2CO3 was more likely to promote hydrolysis and acidification in the limiting stage compared to other samples, when the alkalinity of the system was adjusted. Under different concentrations, the hydrolysis capacity was enhanced by increasing the concentration of added basicity, which led to the deterioration of the dehydration performance, while the Volatile Fatty Acids changed little, and the excess basicity will reduce the gas production and reduction of the system. © 2019, Editorial Board of China Environmental Science. All right reserved.
Keyword ：
Alkalinity; Hydrolysis acidizing bacteria; Methanogens; Moderate-temperature anaerobic digestion; Waste activated sludge Alkalinity; Hydrolysis acidizing bacteria; Methanogens; Moderate-temperature anaerobic digestion; Waste activated sludge
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| GB/T 7714 | Zhao, M.-M. , Li, X.-Y. , Li, L.-K. et al. Effects of alkalinity type and concentration on mesophilic anaerobic digestion of excess sludge [碱度类型及浓度对剩余污泥中温厌氧消化的影响] [J]. | China Environmental Science , 2019 , 39 (5) : 1954-1960 . |
| MLA | Zhao, M.-M. et al. "Effects of alkalinity type and concentration on mesophilic anaerobic digestion of excess sludge [碱度类型及浓度对剩余污泥中温厌氧消化的影响]" . | China Environmental Science 39 . 5 (2019) : 1954-1960 . |
| APA | Zhao, M.-M. , Li, X.-Y. , Li, L.-K. , Peng, Y.-Z. , Zhang, Q. . Effects of alkalinity type and concentration on mesophilic anaerobic digestion of excess sludge [碱度类型及浓度对剩余污泥中温厌氧消化的影响] . | China Environmental Science , 2019 , 39 (5) , 1954-1960 . |
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Abstract ：
A2O and A2O+BCO process were employed to treat domestic wastewater with low carbon to nitrogen ratio (C/N=3.96) to compare their nutrient removal performance, respectively. The influent loading and operation condition were kept consistent for 134 days, A2O+BCO system achieved a higher nitrogen and phosphorus removal efficiency than A2O system because of the application of denitrifying phosphorus removal technology and two-sludge theory, which could use carbon resource more efficiently and solve the SRT contradiction between nitrifiers and PAOs. PAOs accounts for 22% in the stable A2O+BCO system higher than 7% in the A2O system, which explain the mechanism for the superior nutrient removal performance. © 2019, Editorial Board of China Environmental Science. All right reserved.
Keyword ：
A2O process; A2O+BCO process; Denitrifying phosphorus removal; Low C/N ratio; Two sludge A2O process; A2O+BCO process; Denitrifying phosphorus removal; Low C/N ratio; Two sludge
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| GB/T 7714 | Zhao, W.-H. , Wang, M.-X. , Li, J.-W. et al. Nitrogen and phosphorus removal performance comparison between A2O and A2O+BCO system [A2O工艺和A2O+BCO工艺的脱氮除磷性能比较] [J]. | China Environmental Science , 2019 , 39 (3) : 994-999 . |
| MLA | Zhao, W.-H. et al. "Nitrogen and phosphorus removal performance comparison between A2O and A2O+BCO system [A2O工艺和A2O+BCO工艺的脱氮除磷性能比较]" . | China Environmental Science 39 . 3 (2019) : 994-999 . |
| APA | Zhao, W.-H. , Wang, M.-X. , Li, J.-W. , Feng, Y. , Liu, B. , Li, X.-Y. et al. Nitrogen and phosphorus removal performance comparison between A2O and A2O+BCO system [A2O工艺和A2O+BCO工艺的脱氮除磷性能比较] . | China Environmental Science , 2019 , 39 (3) , 994-999 . |
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Abstract ：
Theeffects of gamma rays on two kinds of GaN high-electron-mobility transistors (HEMTs) have been investigated in this paper. We have identified a gate degradation using a combination of optical and electrical measurements. We have demonstrated that the channel current under the degradation position is outside of the gate's control. This degradation prevents the gate from fully pinching off the channel, creating a current concentration region when applying a reverse gate voltage. An integrated analysis, including I-V characterization, the emission microscope (EMMI) technique, and temperature-dependent measurements, was applied to study its mechanism. It is attributed to an irradiation-induced degradation in the Schottky contact.
Keyword ：
gate degradation gate degradation high-electron-mobility transistors (HEMTs) high-electron-mobility transistors (HEMTs) subthreshold current subthreshold current GaN GaN Gamma irradiation Gamma irradiation
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| GB/T 7714 | Zheng, Xiang , Feng, Shiwei , Peng, Chao et al. Evidence of GaN HEMT Schottky Gate Degradation After Gamma Irradiation [J]. | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2019 , 66 (9) : 3784-3788 . |
| MLA | Zheng, Xiang et al. "Evidence of GaN HEMT Schottky Gate Degradation After Gamma Irradiation" . | IEEE TRANSACTIONS ON ELECTRON DEVICES 66 . 9 (2019) : 3784-3788 . |
| APA | Zheng, Xiang , Feng, Shiwei , Peng, Chao , Lin, Gang , Bai, Lin , Li, Xuan et al. Evidence of GaN HEMT Schottky Gate Degradation After Gamma Irradiation . | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2019 , 66 (9) , 3784-3788 . |
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Abstract ：
The stress-strain state of spot welded low carbon steel structure was studied by three methods including extensometer measurement, tensile test and numerical simulation based on ANSYS software. The relationship between angle distortion and load was obtained. The results proved the reliability of simulated mechanics model of spot welding structure including weld and plastic ring and base metal. The relationship between angle distortion and load was achieved by analyzing simulation results of the spot welding structure mechanical model. The yield limit and plastic modulus were adjusted during simulation to make the simulation result of deformation consistent with that of the test result. The test results indicated that the yield limit and plastic modulus of plastic ring were measurable by finite element simulation method which could provide references for relative research. © 2018, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
Keyword ：
Low carbon steel Low carbon steel Tensile testing Tensile testing Spot welding Spot welding Software testing Software testing Numerical methods Numerical methods Steel structures Steel structures
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| GB/T 7714 | Wang, Xiaoguang , Li, Xiaoyang , Chen, Shujun et al. Mechanic parameters analysis of spot welded low carbon steel structure [J]. | Transactions of the China Welding Institution , 2018 , 39 (3) : 107-111 . |
| MLA | Wang, Xiaoguang et al. "Mechanic parameters analysis of spot welded low carbon steel structure" . | Transactions of the China Welding Institution 39 . 3 (2018) : 107-111 . |
| APA | Wang, Xiaoguang , Li, Xiaoyang , Chen, Shujun , Yu, Huiping , Li, Xiang . Mechanic parameters analysis of spot welded low carbon steel structure . | Transactions of the China Welding Institution , 2018 , 39 (3) , 107-111 . |
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This study focused on investigating the nitrogen (N) and phosphorus removal characteristics of a combined enhanced phosphorus removal (EBPR) with simultaneous nitrification and denitrification (SND) process. An anaerobic/aerobic operated sequencing batch reactor (SBR), fed with actual domestic sewage at a low carbon/nitrogen ratio (C/N, around 3.5), was studied firstly for the start-up of EBPR and the enrichment of phosphorus accumulating organisms (PAOs) by adjusting the influent C/N, and lately for the nutrient removal performance, SND efficiency, and carbon sources conversion by adjusting the dissolved oxygen (DO) concentrations at the aerobic stage. Results showed that at DO concentration of around 2.0mg/L and influent C/N increased from 3.2 to 7.5and then recovered to 3.8, effluent PO 4 3- -P concentration gradually decreased from 3.9mg/L to below 0.5mg/L accompanied by the increase of anaerobic phosphorus release amount (PRA) from 3.3mg/L to approximately 30mg/L. Hereafter, when DO concentration gradually decreased to about 1.0mg/L, SND became obvious, and its coupling with EBPR increased the total nitrogen (TN) and PO 4 3- -P removal efficiencies to 85% and 94%, respectively. But when the DO concentration was continued decreased to about 0.5mg/L, nitrification became incomplete and nitrite accumulation became obvious, indicating the existence of simultaneous partial nitrification and denitrification. The results indicated that the combined system has the highest nitrogen and phosphorus removal performance at DO concentration of about 1.0mg/L. In addition, when DO concentration decreased from 2.0mg/L to 0.5mg/L, the contribution of PAOs to the storage of anaerobic intracellular carbon sources (P PAO, An ) gradually reduced from 30.3% to 20.2%, resulted in a decrease of PRA for about 7mg/L. DO concentration of 1.0~1.5mg/L was the most conducive to the synthesis of carbon source PHA in the anaerobic stage of the combined system. © 2018, Editorial Board of China Environmental Science. All right reserved.
Keyword ：
EBPR; GAOs; PAOs; Partial nitrification; SND EBPR; GAOs; PAOs; Partial nitrification; SND
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| GB/T 7714 | Zhao, J. , Wang, X.-X. , Li, X.-Y. et al. Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment [DO浓度对EBPR耦合SND处理低C/N污水的影响] [J]. | China Environmental Science , 2018 , 38 (1) : 120-128 . |
| MLA | Zhao, J. et al. "Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment [DO浓度对EBPR耦合SND处理低C/N污水的影响]" . | China Environmental Science 38 . 1 (2018) : 120-128 . |
| APA | Zhao, J. , Wang, X.-X. , Li, X.-Y. , Peng, Y.-Z. , Jia, S.-Y. . Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment [DO浓度对EBPR耦合SND处理低C/N污水的影响] . | China Environmental Science , 2018 , 38 (1) , 120-128 . |
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Abstract ：
The numerical simulation of the hydrostatic bearing of the fluctuating load is carried out by Ansys cfx. The variation law of the oil film thickness with the load is obtained and compared with the static formula. It reveals the influence of periodic variation of the load displacement interface table. The results show that under the fluctuating load, the oil film thickness, the bearing capacity and the dynamic stiffness are changed to some extent, which also provides the important basis for the reliability design of the hydrostatic bearing.
Keyword ：
Hydrostatic bearing Hydrostatic bearing Ansys cfx Ansys cfx Numerical simulation Numerical simulation Dynamic stiffness Dynamic stiffness
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| GB/T 7714 | Wang Yong-xie , Li Xiao-yang , Wen Jun-wu . Numerical Study on Dynamic Stiffness hydrostatic bearing [C] . 2017 : 1255-1260 . |
| MLA | Wang Yong-xie et al. "Numerical Study on Dynamic Stiffness hydrostatic bearing" . (2017) : 1255-1260 . |
| APA | Wang Yong-xie , Li Xiao-yang , Wen Jun-wu . Numerical Study on Dynamic Stiffness hydrostatic bearing . (2017) : 1255-1260 . |
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Abstract ：
为探索硬度法测量残余应力技术,基于金属材料硬度与残余应力、微观组织的相关性,针对45钢Φ150 mm×150 mm淬火试件,采用剥层法测试试样内部硬度、残余应力,观察微观金相,建立硬度和残余应力间的定量关系;并从微观角度分析了三者间的相关性机理。研究结果表明,残余应力大小和马氏体转变充分程度有关;马氏体转变越充分,残余应力压应力值越高。硬度和相的种类有关,马氏体相的硬度最高,混合组织硬度相比之下有所下降,内部珠光体+铁素体硬度维持在HRC20左右基本不变。等效残余应力和硬度变化量之间符合良好的幂函数关系。为硬度评价残余应力技术的实现提供了一个参考研究途径。
Keyword ：
应力场 应力场 硬度 硬度 微观组织 微观组织 残余应力 残余应力 剥层法 剥层法
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| GB/T 7714 | 黄惠茹 , 李晓阳 , 张琳琳 et al. 火低碳钢硬度、残余应力和微观组织间的关系 [J]. | 科学技术与工程 , 2017 , 17 (34) : 191-196 . |
| MLA | 黄惠茹 et al. "火低碳钢硬度、残余应力和微观组织间的关系" . | 科学技术与工程 17 . 34 (2017) : 191-196 . |
| APA | 黄惠茹 , 李晓阳 , 张琳琳 , 张亦良 . 火低碳钢硬度、残余应力和微观组织间的关系 . | 科学技术与工程 , 2017 , 17 (34) , 191-196 . |
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