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Development of combined coagulation-hydrolysis acidification-dynamic membrane bioreactor system for treatment of oilfield polymer-flooding wastewater

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 99-109页

作者： Xue Shen Lei Lu Baoyu gao Xing Xu Qinvan Yue Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Jinan 250100 China College of Chemical Engineering China University of Petroleum Qingdao 266580 China

A combined system composed of coagulation, hydrolysis acidification and dynamic membrane bioreactor (DMBR) was developed for treating the wastewater produced from polymer flooding. Performance and mechanism of the combined system as well as its respective units were also evaluated. The combined system has shown high-capacity to remove all contaminants in the influent. In this work, the coagulant, polyacrylamide-dimethyldiallyammonium chloride-butylacrylate terpolymer (P(DMDAAC-AM-BA)), integrated with demulsifier (SD-46) could remove 91.8% of crude oil and 70.8% of COD. Hydrolysis acidification unit improved the biodegradability of the influent and the experimental results showed that the highest acidification efficiency in hydrolysis acidification reactor was 20.36% under hydraulic retention time of 7h. The DMBR proceeded efficiently without serious blockage process of membrane fouling, and the concentration of ammonia nitrogen (NH3-N), oil, chemical oxygen demand and biological oxygen demand in effluent were determined to be 3.4±2.1, 0.3±0.6, 89.7±21.3 and 13±4.7 mg/L.

关键词： Coagulation Hydrolysis acidification Dynamic membrane bioreactor Polymer flooding

A review of fundamental factors affecting diesel PM oxidation behaviors

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Science China(Technological Sciences) 2018年第3期61卷 330-345页

作者： gao JianBing MA ChaoChen XING ShiKai SUN LiWei HUANG LiYong School of Mechanical Engineering Beijing Institute of Technology Department of Mechanical Engineering Sciences University of Surrey School of Vocational and Technical Hebei Normal University

Diesel particulate matter(DPF) is usually employed to meet the stringent regulations on particulate matter(PM) emissions for diesel engine. To resolve the DPF regeneration problem, comprehensive information about the factors influencing PM oxidation behaviors must be understood. Large amounts of factors related to PM oxidation activity have been investigated, however, some relations are still ambiguous. This paper reviews the factors related to PM oxidation activity that the factors are divided into the engine-correlated and engine-uncorrelated factors. The methods with both advantages and disadvantages to test the oxidation behaviors are introduced. The microstructure and ingredient being fundamental factors affecting PM oxidation behaviors are as the principle line to correlate PM oxidation behaviors and engine-correlated factors. The relations of engine-correlated factors with oxidation behaviors are obtained though advanced technologies that are mutual complementation. The engine-uncorrelated factors are also reviewed that these factors are vital to oxidation activity changes. Multiple-factor analysis rather than single-factor analysis should be developed to make the oxidation behaviors of diesel PM more clear.

关键词： diesel PM oxidation behaviors microstructure ingredient

Characteristics and influencing mechanisms of production-living-ecological space dynamics in the Three Gorges Reservoir Area(TGRA),Chongqing,China

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Regional Sustainability 2024年第2期5卷 49-62页

作者： ZHU Xinyi gao Jinlong School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing210044China University of Chinese Academy of Sciences Nanjing(UCASNJ)Nanjing211135China Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing210008China

The Three Gorges Reservoir Area(TGRA)is an important ecological barrier in the Yangtze River Basin,***,it is of great importance to understand the spatio-temporal variation and the driving factors of production-living-ecological spaces for sustainable and high-quality development in the *** study investigated the dynamic variation of production-living-ecological spaces in the TGRA by employing land use data in 2000,2005,2010,2015,and 2018,and detected the influencing factors by using the Geographic detector(GeoDetector).Results implied that the structure and dynamic trajectories of production-living-ecological spaces in the TGRA varied in both horizontal and vertical directions,and the study area was dominated by ecological space.A spatial orientation towards the northeast was detected in the evolution of production-living-ecological spaces during *** terms of quantity,the transition from ecological space(grassland and woodland)to agriculture land accounted for the largest proportion from 2000 to ***,the reverse transition from agriculture land to ecological space has increased since 2000 with the efforts of“Grain for Green”.In terms of temporal scale,there was a fluctuating trend in production space with the continuous expansion of living space,while ecological space showed an inverted U-shaped trend during *** dynamic pattern of production-living-ecological spaces in the TGRA was influenced by both physical and socio-economic variables as basic determinants and dominant driving factors,***,the harmonization and protection of production-living-ecological spaces still require policy-makers’*** work may have potential in advancing our understanding about land use conflicts,and provide a reference for rational layout of spatial functions and the realization of sustainable development in the TGRA.

关键词： Production-living-ecological spaces Functional transition Three Gorges Reservoir Area(TGRA) Physical and socio-economic variables Yangtze River

Frequency Characteristics of the Saturated Gain in Nonequilibrium Gas Flow and Doppler-Broadened Chemical Laser Amplifiers

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Chinese Physics Letters 1991年第11期8卷 566-569页

作者： FAN Anfu gao Zhi Departzruent of Opto-electric Science and Technique Sichuaa UniversityChengdu 610064 Institute of Mechanics Academia Sinica Beijing 100080

We present "convection-nonequilibrium cross relaxation" model for a gas flow and chenical *** experessions of the satnrated gain spectrum are obtained for the two-type flow nuodels with layer or turbulent fow mixture *** numer rical resutlts show that the gain profile of a saturated un;pifer w1th Dopler-broadening is a mixture of inhomogeneous and homogeneocs prohles.

关键词： mixture saturated relaxation

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掺烧煤泥循环流化床锅炉床温动态建模

热力发电 2018年第2期47卷 43-48页

作者：杨婷婷邸小慧洪烽高明明张蓓华北电力大学新能源电力系统国家重点实验室北京102206

煤泥是煤炭洗选加工后的废弃物,具有高黏度、高含水量、低发热量等特性。而循环流化床(CFB)作为一种清洁高效的燃烧技术,是处理煤泥的一条有效途径。床温是CFB锅炉燃烧系统的重要参数,掺烧煤泥会导致CFB锅炉床温降低,加剧床温在边界值... 详细信息

煤泥是煤炭洗选加工后的废弃物,具有高黏度、高含水量、低发热量等特性。而循环流化床(CFB)作为一种清洁高效的燃烧技术,是处理煤泥的一条有效途径。床温是CFB锅炉燃烧系统的重要参数,掺烧煤泥会导致CFB锅炉床温降低,加剧床温在边界值的波动性,影响机组的安全稳定运行。对此本文以历史运行数据为基础,采用最小二乘支持向量机(LSSVM)动态建模算法建立以给煤量、煤泥量、一次风量、二次风量、外置床阀门开度和入炉石灰石量为输入变量,锅炉床温为输出变量的掺烧煤泥CFB锅炉床温动态模型,并对模型进行了仿真验证。结果表明,该模型准确度高,实时性好,可用于床温在线预测。

关键词：掺烧煤泥 CFB锅炉床温动态模型最小二乘支持向量机在线预测

Bearing capacity of surface circular footings on granular material under low gravity fields

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 612-625页

作者： Pin-Qiang Mo Guoqing Zhou Feng gao Ruilin Li State Key Laboratory for Geomechanics and Deep Underground Engineering School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou221116China School of Civil Engineering Central South UniversityChangsha410075China

Low gravity fields have been simulated through magnetic acceleration to conduct experimental study on bearing capacity of circular footings on a type of crushable planetary regolith simulant,which has comparable density and particle size distribution of lunar *** loadesettlement responses of surface spread footings are obtained by investigating the relative density,footing size and gravity *** the hyperbolic asymptote method,normalised foundation stiffness and ultimate bearing capacity are obtained by curve fitting and predicted by power functions using multivariate nonlinear *** results show that the nonlinear gravity effect is not negligible,related to stress condition,soil dilatancy and mobilised friction angle.A cone penetration test(CPT)-based method for prediction of bearing capacity is proposed with correlations between ultimate bearing capacity of footings and shallow penetration stiffness of CPTs,avoiding the uncertainties of soil property *** of allowable bearing capacity and footing influence zone in consideration of footing size and gravity effects could therefore improve the design of shallow foundations on the Moon and Mars,and provide new understandings and potential implications to the bearing capacity of shallow foundations on crushable granular material in both terrestrial and extraterrestrial geotechnical engineering.

关键词： Low gravity fields Bearing capacity Shallow foundation Planetary regolith simulant

Quantum Private Query Protocol Based on EPR Pairs

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Chinese Journal of Electronics 2018年第2期27卷 256-262页

作者： CHANG Yan XIONG Jinxin gao Xiang ZHANG Shibin YAN Lili College of Information Security Engineering Chengdu University of Information Technology School of Computer Beijing University of Posts and Telecommunications

We propose a Quantum private query(QPQ) protocol based on device-independent Quantum key distribution(QKD) by using Einstein-Podolsky-Rosen(EPR) pairs. We analyze coherent attacks by a third party in a weaker constraints(non-signaling condition) compared with the formalism of quantum physics. We deduce the relationship between the raw key bits of Alice and the third party’s attack factor. Compared with existing QPQ protocols, our protocol is secure even when the source and measuring equipment used to distribute oblivious secret key can not be trusted. Quantum register is not needed in our protocol.

关键词： Quantum private query(QPQ) Coherent attack Einstein-Podolsky-Rosen(EPR) pairs Bell inequality

Vehicle Detection Based on Visual Saliency and Deep Sparse Convolution Hierarchical Model

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Chinese Journal of Mechanical Engineering 2016年第4期29卷 765-772页

作者： CAI Yingfeng WANG Hai CHEN Xiaobo gao Li CHEN Long Automotive Engineering Research Institute Jiangsu University School of Automotive and Traffic Engineering Jiangsu University

Traditional vehicle detection algorithms use traverse search based vehicle candidate generation and hand crafted based classifier training for vehicle candidate *** types of methods generally have high processing times and low vehicle detection *** address this issue,a visual saliency and deep sparse convolution hierarchical model based vehicle detection algorithm is proposed.A visual saliency calculation is firstly used to generate a small vehicle candidate *** vehicle candidate sub images are then loaded into a sparse deep convolution hierarchical model with an SVM-based classifier to perform the final *** experimental results demonstrate that the proposed method is with 94.81% correct rate and 0.78% false detection rate on the existing datasets and the real road pictures captured by our group,which outperforms the existing state-of-the-art *** importantly,high discriminative multi-scale features are generated by deep sparse convolution network which has broad application prospects in target recognition in the field of intelligent vehicle.

关键词： vehicle detection visual saliency deep model convolution neural network

Thermodynamic analysis of ethanol synthesis from hydration of ethylene coupled with a sequential reaction

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 847-856页

作者： Jie gao Zhikai Li Mei Dong Weibin Fan Jianguo Wang State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China University of the Chinese Academy of Sciences Beijing 100049China

Coal-based ethanol production by hydration of ethylene is limited by the low equilibrium ethylene conversion at elevated *** improve ethylene conversion,coupling hydration of ethylene with a potential ethanol consumption reaction was analyzed *** reactions have been attempted and compared:(1)dehydration of ethanol to ethyl ether(2C2H2OH5■C2H5OC2H5+H2O),(2)dehydrogenation of ethanol to acetaldehyde(C2H2OH5■CH3CHO+H2),(3)esterifica-tion of acetic acid with ethanol(C2H3OH+CH,COOH■CH3COOC2H5+H2O),(4)dehydrogenation of etha-nol to ethyl acetate(2C2H5OH■CH3COOC2H5+2H2),and(5)oxidative dehydrogenation of ethanol to ethyl acetate(2C2H2OH+O2■CH3COOC2H5+2H2O).The equilibrium constants and equilibrium distributions of the coupled reactions were calculated and the effects of feed composition,temperature and pressure upon the ethylene equilibrium conversion were *** results show that dehydrogenation of ethanol to acetaldehyde has lttle effect on ethylene conversion,whereas for dehydrogenation of ethanol to acetaldehyde and ethyl acetate,ethylene conversion can be improved from 8%to 12.8%and 18.5%,respectively,under conditions of H2O/C2H4=2,10 atm and 300℃.The esterification of acetic acid with ethanol can greatly enhance the ethylene conversion to 22.5%;in particular,ethylene can be actually completely converted to ethyl acetate by coupling oxidative dehydrogenation of ethanol.

关键词： ethylene ethanol thermodynamics coupling