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煤矿酸性废水中硫酸盐的防治与潜在资源化技术研究进展

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洁净煤技术 2024年第1期30卷 189-204页

作者：张春晖章昭陈乐贻李伟宪中国矿业大学(北京)全过程污染控制与循环经济研究所北京100083 河北利仕化学科技有限公司河北邯郸057550

煤炭在未来依然是中国能源结构的重要组成部分,煤炭开采过程中产生含高浓度硫酸盐的煤矿酸性废水(ACMD)是制约其实现高质量绿色可持续发展的关键。ACMD是SO_(4)^(2-)的一个重要工业污染来源,其主要是含硫矿暴露后的氧化作用产生。通过回... 详细信息

煤炭在未来依然是中国能源结构的重要组成部分,煤炭开采过程中产生含高浓度硫酸盐的煤矿酸性废水(ACMD)是制约其实现高质量绿色可持续发展的关键。ACMD是SO_(4)^(2-)的一个重要工业污染来源,其主要是含硫矿暴露后的氧化作用产生。通过回顾ACMD的形成机理和危害,分析了可用于源头预防和后续处理的技术,秉持“预防胜于治理”的原则,全面分析了抑菌剂、氧气隔绝和表面钝化等预防硫酸盐产生的技术特点,后续处理阶段目前采用较多的技术包括化学沉淀、吸附、离子交换与膜技术的主动修复技术和以生物处理与人工湿地为主的被动修复技术。主动修复技术存在二次污染的风险和成本较高等问题,被动修复技术的处理时间和系统稳定性限制其广泛应用;鉴于硫酸在化学和冶金工业中市场可观,从ACMD回收硫酸的资源化前景潜力巨大,目前关于从ACMD中回收硫酸的潜在技术包括精馏、扩散渗析、电渗析、溶剂萃取和结晶等,评估了每种工艺应用于ACMD中的技术和经济可行性;最后着重强调了关于ACMD中硫酸盐防治和资源化技术的未来发展前景,其中包括深入研究预防技术,降低处理成本,开发新型稳定的处理和回收工艺,为煤炭行业的污染控制与废弃物资源化提供新的控制策略和更广泛的研究思路。

关键词：煤矿酸性废水硫酸盐源头预防废水处理资源回收

Homoleptic alkynyl-protected Ag_(32 )nanocluster with atomic precision: Probing the ligand effect toward CO_(2) electroreduction and 4-nitrophenol reduction

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Nano Research 2022年第10期15卷 8908-8913页

作者： leyi chen Fang Sun Quanli Shen Lubing Qin Yonggang Liu Liang Qiao Qing Tang Likai Wang Zhenghua Tang New Energy Research Institute School of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational ChemistryChongqing UniversityChongqing 401331China China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049China Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan UniversityGuangzhou 510632China

We report a superatomic homoleptic alkynyl-protected Ag_(32)L_(24)(L=3,5-bis(trifluoromethylbenzene)acetylide,Ag_(32) for short)nanocluster with atomic precision,which possesses eight free ***_(32) is formed by an Ag17 core with C3 symmetry and the remaining 15 Ag atoms bond to each other and coordinate with the 24 surface *** applied as electrocatalyst for CO_(2) reduction reaction(CO_(2)RR),Ag_(32) exhibited the highest Faradaic efficiency(FE)of CO up to 96.44%at−0.8 V with hydrogen evolution being significantly suppressed in a wide potential range,meanwhile it has a reaction rate constant of 0.242 min−1 at room temperature and an activation energy of 45.21 kJ·mol−1 in catalyzing the reduction of 4-nitrophenol,both markedly superior than the thiolate and phosphine ligand co-protected Ag_(32) *** strong ligand effect was further understood by density functional theory(DFT)calculations,as it revealed that,one single ligand stripping off from the intact cluster can create the undercoordinated Ag atom as the catalytically active site for both clusters,but alkynyl-protected Ag_(32) nanocluster possesses a smaller energy barrier for forming the key*COOH intermediate in CO_(2)RR,and favors the adsorption of *** study not only discovers a new member of homoleptic alkynyl-protected Ag nanocluster,but also highlights the great potentials of employing alkynyl-protected Ag nanoclusters as bifunctional catalysts toward various reactions.

关键词： Ag_(32)nanocluster,alkynyl ligand,ligand effect,CO_(2)electroreduction,4-nitrophenol reduction

Remaining Useful Life Prediction of Turbofan Engine Using Hybrid Model Based on Autoencoder and Bidirectional Long Short-Term Memory

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Journal of Shanghai Jiaotong university(Science) 2018年第S1期23卷 85-94页

作者： SONG Ya SHI Guo chen leyi HUANG Xinpei XIA Tangbin State Key Laboratory of Mechanical System and Vibration Department of Industrial EngineeringSchool of Mechanical Engineering Shanghai Jiao Tong University

Turbofan engine is a critical aircraft component with complex structure and high-reliability requirements. Effectively predicting the remaining useful life(RUL) of turbofan engines has essential significance for developing maintenance strategies and reducing maintenance costs. Considering the characteristics of large sample size and high dimension of monitoring data, a hybrid health condition prediction model integrating the advantages of autoencoder and bidirectional long short-term memory(BLSTM) is proposed to improve the prediction accuracy of RUL. Autoencoder is used as a feature extractor to compress condition monitoring data. BLSTM is designed to capture the bidirectional long-range dependencies of features. A hybrid deep learning prediction model of RUL is constructed. This model has been tested on a benchmark dataset. The results demonstrate that this autoencoder-BLSTM hybrid model has a better prediction accuracy than the existing methods, such as multi-layer perceptron(MLP), support vector regression(SVR), convolutional neural network(CNN) and long short-term memory(LSTM). The proposed model can provide strong support for the health management and maintenance strategy development of turbofan engines.

关键词： remaining useful life(RUL) autoencoder bidirectional long short-term memory(BLSTM) deep learning

A technical survey on mechanism and influence factors for asphalt pavement skid-resistance

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Friction 2024年第5期12卷 845-868页

作者： Xiyin LIU Haoyuan LUO Can chen leyi ZHU Siyu chen Tao MA Xiaoming HUANG School of Transportation Southeast UniversityNanjing211189China

To explore the research status on mechanism of the skid-resistance for asphalt pavement, the related achievements of the rubber friction, the tire–road contact, and the influence factors were reviewed. The rubber friction was reviewed from the mechanism and rubber friction model. The tire-road contact was studied from the modeling methods, the evaluation methods, and the skid-resistance mechanisms at different conditions. The influence factors of skid-resistance were summarized from different designing processes. This review showed that the appropriate contact or evaluation model should be selected according to the required parameters. Although the finite element method is widely used, the accuracy of the model, the boundary conditions, and the load cases need to be further improved. The optimized aggregates and asphalt binders, reasonable gradation, reasonable geometric design, and strict construction quality control are necessary for good initial skid-resistance. Pavement texture as an important factor affecting skid-resistance should be considered in pavement gradation design, especially for wearing layer technology.

关键词： asphalt pavement rubber friction tire-road contact skid-resistance

Investigation of surface textures deterioration on pavement skid-resistance using hysteresis friction models and numerical simulation method

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Friction 2024年第4期12卷 745-779页

作者： Haoyuan LUO Siyu chen leyi ZHU Xiyin LIU Yangzezhi ZHENG Runming ZHAO Xiaoming HUANG School of Transportation Southeast UniversityNanjing 211189China National Demonstration Center for Experimental Education of Road and Traffic Engineering Southeast UniversityNanjing 211189China

Many rubber friction theories or some method combined theories and field-experiments are employed to evaluate the pavement skid-resistance deterioration due to the evolution of surface ***,these methods are difficult to be implemented in the analysis of situations with multi-factor coupling and some extreme *** study developed a framework to evaluate the skid-resistance deterioration of asphalt *** this framework,the portable laser scanning was used to create the digital worn pavement model,and a hydroplaning finite element(FE)model for these digital worn pavements was constructed to evaluate coupling effects of the texture evolution and factors of slip ratio,slip angle,velocity and water film on braking-cornering characteristics of *** this study,the deterioration of skid-resistance of five typical asphalt pavements due the surface texture wear was systematically investigated by this *** with previous works,this study established the rubber friction models for each digital worn pavement considering the energy hysteresis of rubber and the power spectrum density of surface *** the rubber friction model was used to define the interaction behaviors between the tire and corresponding wore pavements in the FE hydroplaning model,rather than using an empirical friction model or a fixed friction coefficient.

关键词： worn pavement skid-resistance friction coefficient textures evolution water film computer numerical simulation

基于二维码防伪的农产品溯源优化对策——以金华市特色农产品为例

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农业工程 2024年第5期14卷 48-53页

作者：赵剑波陆丹丹姜霞冯雨馨张少源陈乐怡金华市农业农村大数据发展中心浙江金华321000 浙江师范大学浙江金华321000

农产品由田间到餐桌不仅是一个实体制造与供给的过程,也是一个信息生产与传输的过程,以金华市特色农产品为主要对象,对金华市生产基地实地考察分析得出,溯源二维码进行防伪加密符合当地农产品追踪溯源需求,将产品合格证进行电子化、在线... 详细信息

农产品由田间到餐桌不仅是一个实体制造与供给的过程,也是一个信息生产与传输的过程,以金华市特色农产品为主要对象,对金华市生产基地实地考察分析得出,溯源二维码进行防伪加密符合当地农产品追踪溯源需求,将产品合格证进行电子化、在线化,可以实现生产全流程的数据可视化,方便消费者查询回溯。综述了传统农产品溯源研究现状,从农产品的生产、包装、运输和销售4个环节出发,分析了数字化农产品全程溯源的需求和优势,并从推进农产品溯源二维码防伪建设、合格证电子化、气象预测及溯源后台建设等方面提出了发展对策,以期加强对农产品各个环节的质量监控。

关键词：农产品溯源二维码防伪质量监控农产品质量安全

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世界聚烯烃工业的发展趋势

合成树脂及塑料 2008年第1期25卷 1-7页

作者：陈乐怡中国石化集团公司经济技术研究院北京100029

综述了世界聚烯烃市场和技术的发展趋势。中东聚烯烃工业快速发展和跨国大公司聚烯烃产品及催化剂的升级趋势是我国聚烯烃工业面临的挑战,今后必须进一步加强自主创新能力,更多生产中东装置不能生产的高端产品,千方百计降低生产成本,应... 详细信息

综述了世界聚烯烃市场和技术的发展趋势。中东聚烯烃工业快速发展和跨国大公司聚烯烃产品及催化剂的升级趋势是我国聚烯烃工业面临的挑战,今后必须进一步加强自主创新能力,更多生产中东装置不能生产的高端产品,千方百计降低生产成本,应对聚烯烃行业的竞争。

关键词：聚烯烃聚乙烯聚丙烯催化剂工艺链穿梭剂高通量筛选多区反应器

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论中国环形的菲利普斯曲线

南京社会科学 2006年第3期 6-11页

作者：陈乐一湖南大学经贸学院教授博导长沙410079

菲利普斯曲线可划分为四种类型,这几种类型的菲利普斯曲线可以通过一种环形曲线图来加以说明。改革开放以来我国菲利普斯曲线出现了不规则但相当明显的两个环形曲线,并且呈现顺时针方向运动,这两个环形曲线的出现年份分别是1980-1990年... 详细信息

菲利普斯曲线可划分为四种类型,这几种类型的菲利普斯曲线可以通过一种环形曲线图来加以说明。改革开放以来我国菲利普斯曲线出现了不规则但相当明显的两个环形曲线,并且呈现顺时针方向运动,这两个环形曲线的出现年份分别是1980-1990年和1990-2000年。从这个环形曲线可以看出,改革开放以来我国的菲利普斯曲线虽然多次发生变形,但总体说来其变动轨迹还是大体表现为基本菲利普斯曲线的形状。

关键词：菲利普斯曲线环形曲线

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建国以来我国历次经济波动回眸

管理世界 2007年第12期23卷 148-149页

作者：陈乐一湖南大学

建国50多年来,我国大大小小的经济波动计有12次。通过从史的角度对历次经济波动的回眸,可以发现历次经济波动的物质技术基础是投资波动。投资的扩张和压缩导致经济扩张和收缩的交替出现。投资扩张和压缩,经济的繁荣和萧条,根本原因在于... 详细信息

建国50多年来,我国大大小小的经济波动计有12次。通过从史的角度对历次经济波动的回眸,可以发现历次经济波动的物质技术基础是投资波动。投资的扩张和压缩导致经济扩张和收缩的交替出现。投资扩张和压缩,经济的繁荣和萧条,根本原因在于既有的经济体制和中央政府的政策决定。

关键词：经济波动投资波动繁荣衰退