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Bioenergy recovery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study

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Journal of Environmental Sciences 2025年第2期148卷 321-335页

作者： Hui Wang Xiang Fu Haozhe Huang Danni Shen dongdong fan Liming Zhu Xiaohu Dai Bin Dong College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Yangtze Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China Yangtze River Eco-Environmental Engineering Research Center Shanghai InvestigationDesign and Research Institute Co.LTDShanghai 200092China China Construction Third Engineering Bureau First Engineering Co. Ltd.Wuhan 430000China

Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic content and higher silt contentdue to leakage of drainage system,which caused low bioenergy recovery and carbon emission benefits in conventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term continuous flow of 200 *** VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,compared to those of *** analysis of organic compositions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in *** analysis of microbial community proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,Coprothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent *** combined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment could provide better methanogenic conditions for ***,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment could reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关键词： Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions

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Prediction of lateral wall deflections of excavations in water-rich sands by a modified multivariate-adaptiveregression- splines method

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Frontiers of Structural and Civil Engineering 2024年第12期18卷 1971-1984页

作者： dongdong fan Delujia GONG Yong TAN Yongjing TANG State Key Laboratory of Disaster Reduction in Civil Engineering Department of Geotechnical EngineeringCollege of Civil EngineeringTongji UniversityShanghai 200092China

Machine learning methods have advantages in predicting excavation-induced lateral wall *** to lack of sufficient field data,training data for prediction models were often derived from the results of numerical simulations,leading to poor prediction *** on a specific quantity of data,a multivariate adaptive regression splines method(MARS)was introduced to predict lateral wall deflections caused by deep excavations in thick water-rich *** of lateral wall deflections to affecting factors was *** is disclosed that dewatering mode has the most significant influence on lateral wall deflections,while the soil cohesion has the least *** crossvalidation analysis,weights were introduced to modify the MARS method to optimize the prediction *** of the predicted and measured deflections shows that the prediction based on the modified multivariate adaptive regression splines method(MMARS)is more accurate than that based on the traditional MARS *** prediction model established in this paper can help engineers make predictions for wall displacement,and the proposed methodology can also serve as a reference for researchers to develop prediction models.

关键词： lateral wall deflection machine learning multivariate adaptive regression splines method excavation database water-rich sand

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Induction of functional neutrophils from mouse fibroblasts by thymidine through enhancement of Tet3 activity

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Cellular & Molecular Immunology 2022年第5期19卷 619-633页

作者： Buqing Ye Liuliu Yang Benyu Liu Nian Liu dongdong fan Huimu Li Lei Sun Ying Du Shuo Wang Yong Tian Zusen fan Key Laboratory of Infection and Immunity of CAS Institute of BiophysicsChinese Academy of SciencesBeijing100101China Department of Biomedical Engineering College of Future TechnologyPeking UniversityBeijing100080China Research Center of Basic Medicine Academy of Medical SciencesZhengzhou UniversityZhengzhou450001China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of RNA Biology Institute of BiophysicsChinese Academy of SciencesBeijing100101China Core Facility Center Institute of BiophysicsChinese Academy of SciencesBeijing100101China

Neutrophils are derived from bone marrow hematopoietic stem cells(HSCs)and are the largest population among circulating white blood cells in humans,acting as the first line of defense against invading *** neutrophils can be generated by transdifferentiation strategies is ***,we show that thymidine induces the conversion of mouse fibroblasts to *** neutrophils(iNeus)showed antibacterial effects and did not undergo malignant transformation in ***,iNeu transplantation cured neutropenia in mice in ***,thymidine mediates iNeu conversion by enhancing Tet3 ***3 initiates the expression of the neutrophil fate decision factors Cebpδ and Rfx1 that drive the transdifferentiation of mouse fibroblasts to ***,the induction of functional neutrophils by chemicals may provide a potential therapeutic strategy for patients with neutropenia patients and infectious diseases.

关键词： Fibroblasts Neutrophils Thymidine Transdifferentiation Tet3

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Comprehensive eco-environmental effects of the shelter-forest ecological engineering along the Tarim Desert Highway

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Chinese Science Bulletin 2008年第S2期53卷 190-202页

作者： LEI JiaQiang LI ShengYu JIN ZhengZhong fan JingLong WANG HaiFeng fan dongdong ZHOU HongWei GU Feng QIU YongZhi XU Bo Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China Graduate University of the Chinese Academy of Sciences Beijing 100049China Tarim Branch PetroChina Company LimitedKorla 841000China

In this work, we report a comprehensive study about the eco-environmental effects of the shelter forest along the Tarim Desert Highway, including the effects on aeolian environment, soil, micro-climate, biodiversity, and groundwater. The results show that: (1) The movement of windblown sand near the ground surface was affected by the shelter forest. The wind speed and sediment transport rate in the shelter forest decreased by 64%―80% and 87.45%―99.02%, respectively. In addition, there were also significant changes in the sand flux structure, the sand grain size, and the deflation and deposition on the ground surface. (2) Compared to the natural mobile sand, the soil bulk density in the forest area decreased while the total salt content, the total porosity, and the water content increased. In addition, the soil fertility was significantly improved in the forest area, and showed the "first rapid, then slow" variation pattern. (3) The shelter forest showed positive effects on the micro-climate. Within the 6 m height above the ground, the air temperature in the shelter forest at different heights was lower than that in the mobile sand, while the air humidity was higher, while, the soil temperature was also lower in the shelter forest than mobile sand. (4) The number of soil microbial species increased significantly with the improvement of habitat in the shelterbelt. However, the population of different species was not distributed evenly across the surveyed area. (5) Currently, no significant effects of groundwater-pumping and forest-irrigation water have been found on the groundwater level and its salinity. The variation amplitude of both groundwater level and salinity was at the level of centimeters and 1g/L, respectively. No obvious variation trend has been observed.

关键词： desert shelter-forest engineering environmental effect aeolian environment biodiversity

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Ultrafast dynamics and dissociative ionization of CS_2 molecules studied via the femtosecond pump-probe method

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Chinese Science Bulletin 2011年第9期56卷 855-861页

作者： ZHANG dongdong fan Zhen SUN ErPing ZHANG JunFeng LIU Hang XU HaiFeng JIN MingXing DING DaJun Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China

The ultrafast dynamics and dissociative ionization of CS2 were studied using the pump-probe method with time-of-flight mass spectroscopy. The transient behavior of both parent ion (CS2+) and fragment ions (S+ and CS+) was observed. It was found that all the ionic signals decay exponentially with lifetimes that were different for delay times, t>0 and t<0, which can be attributed to the evolution of different Rydberg states pumped by 267-nm and 400-nm laser pulses. The lifetimes of two Rydberg states were obtained simultaneously from one fitting of the transients. The fragment ions were produced by the dissociation of CS2+, and it is suggested that the final ionic state is the C2Σg+ state of CS2+ based on the measured S+/CS+ branching ratio. The S+/CS+ ratio is dependent on the delay time of the two lasers, indicating that the dissociation process of CS2+ is related to the evolution of the intermediate Rydberg state.

关键词：泵浦探测法超快动力学解离电离分子离解 Cs2 飞秒碎片离子二硫化碳

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Classification and regionalization of the forming environment of windblown sand disasters along the Tarim Desert Highway

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Chinese Science Bulletin 2008年第S2期53卷 1-7页

作者： LEI JiaQiang LI ShengYu fan dongdong ZHOU HongWei GU Feng QIU YongZhi XU Bo LIU Shang DU WenYi YAN ZengHui WANG YongChang Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China Graduate University of the Chinese Academy of Sciences Beijing 100049China Tarim Branch PetroChina Company LimitedKorla 841000China Tuha Branch PetroChina Company LimitedKorla 841000China

Through the systematic field survey and observations, the factor quantification as well as setting the criteria, the sand disaster-forming environment along the Tarim Desert Highway can be divided into four grades by the classification and regionalization based on fuzzy mathematics. The length of the regions with significant sand disaster accounted for 37.1% of the total highway length. Particularly, the area along the Tarim Desert Highway, based on the sand disaster-forming environment classification as well as the difference in the five basic landform units along the highway, combined with the difference of wind regime, can be divided into five regions, in which the length of the regions suffering severe sand damage occupied 64.3% of the total highway length. In addition, the index of disaster formation grade along the highway decreased from north to south, showing a repeated spatial pattern in small length scales.

关键词： Tarim Desert Highway classification of forming environment of windblown sand disasters regionalization

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Novel titanium vanadate with superior Naþtransport kinetics for rapid charging and low-temperature sodium ion batteries

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Green Energy & Environment 2025年第2期10卷 374-381页

作者： Dan Lv Liehao Wei Cheng Wang Mingyue Wang Zhongchao Bai Yameng fan dongdong Wang Nana Wang Jian Yang Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjin300072China Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan250100China Tianjin Key Lab of Indoor Air Environmental Quality Control School of Environmental Science and TechnologyTianjin UniversityTianjin300072China Institute for Superconducting and Electronic Materials University of WollongongWollongongAustralia Institute of Energy Materials Science(IEMS) University of Shanghai for Science and Technology516 Jungong RoadShanghai200093China

Sodium-ion batteries(SIBs)hold great promise for large-scale energy storage in the post-lithium-ion battery era due to their high rate performance and long lifespan,although their sluggish Naþtransformation kinetics still require *** by the excellent electrochemical performance of titanium-based anode materials,here,we present a novel titanium vanadate@carbon(TVO@C)material as anode for *** TVO@C material is synthesized via a facile coprecipitation method,with the following annealing process in an acetylene *** opened ion channel and the oxygen vacancies within TVO@C facilitate the diffusion of Naþions,reducing their diffusion ***,an ultrahigh rate of 100 A g^(-1)and long life of 10,000 cycles have been ***,the TVO@C electrode exhibits stable performance,not only at room temperature,but also at temperatures as low as 20 *** TVO@CjjNa_(3)V_(2)(PO_(4))_(3)@C full cells have also achieved stable discharge/charge for 500 *** is believed that this strategy provides new insight into the development of advanced electrodes and provides a new opportunity for constructing novel high rate electrodes.

关键词： Anode High rate Titanium vanadate Sodium ion batteries

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基于BP神经网络的GNSS-R海面风速反演

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航空学报 2019年第12期40卷 193-201页

作者：高涵白照广范东栋航天东方红卫星有限公司

针对GNSS-R进行海面风速反演过程中时频域相关物理量较多,数据耦合性强等问题,提出了基于反向传播(BP)神经网络反演海面风速的方法。建立反演过程中相关观测量与风速的对应关系,选取多观测量作为输入,对输入数据进行处理,设置神经元与... 详细信息

针对GNSS-R进行海面风速反演过程中时频域相关物理量较多,数据耦合性强等问题,提出了基于反向传播(BP)神经网络反演海面风速的方法。建立反演过程中相关观测量与风速的对应关系,选取多观测量作为输入,对输入数据进行处理,设置神经元与激励函数,使用BP神经网络自适应调整拟合参数,将风速作为神经网络输出端的特征量提取。反演结果,风速≤20m/s时,反演均方根误差RMSE=1.21m/s,风速>20m/s时反演均方根误差RMSE=2.54m/s,反演结果优于使用时延相关曲线前沿斜率(LES)和时延多普勒相关功率均值(DDMA)方法得到的反演结果,且迭代次数较少,复杂度较低,证明该方法可以应用于GNSS-R海面风速反演。

关键词： GNSS-R 海面风速反向传播(BP) 神经网络反演模型

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水冷夹套器壁过热损伤的失效分析

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压力容器 2019年第9期36卷 47-52页

作者：谭蔚樊东东天津大学化工学院

夹套是一种典型的压力换热设备,广泛应用在反应釜、混合器、气化炉中。夹套内部冷却流体自身带压,夹套壁又同时承受较高的温度梯度,操作不当时极易发生失效。针对某厂电煅炉水冷夹套冷却系统中,水冷夹套外壁面出现烧穿、熔融,并导致炉... 详细信息

夹套是一种典型的压力换热设备,广泛应用在反应釜、混合器、气化炉中。夹套内部冷却流体自身带压,夹套壁又同时承受较高的温度梯度,操作不当时极易发生失效。针对某厂电煅炉水冷夹套冷却系统中,水冷夹套外壁面出现烧穿、熔融,并导致炉体损伤破坏的失效原因进行了热耦合数值模拟分析。结果表明,在事故工况0.025MPa的进水压力下,冷却水无法完全充满夹套,夹套内部液相上方存在一个气相空间,导致夹套器壁局部出现过热现象,器壁温度高达1379.25℃,造成夹套外壁过热损伤乃至烧透。通过进一步分析,在设计压力为0.1MPa下,夹套具有较好的冷却效果,器壁温度低于557℃,冷却效果可以保证设备安全运行。

关键词：水冷夹套局部过热数值模拟过热损伤

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气门油封结构参数设计及优化

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润滑与密封 2021年第7期46卷 121-127页

作者：雷刚谭巍樊伟范冬冬重庆理工大学汽车零部件先进制造技术教育部重点实验室重庆400054 浙江吉利汽车研究院有限公司浙江宁波315336

为研究发动机气门油封结构参数对油封密封性能的影响,在有限元分析基础上,对油面唇角、气面唇角、安装过盈、唇口圆角半径、弹簧刚度等结构参数进行正交试验设计,研究油封结构参数对气门油封唇口最大接触压力和单位周长径向力的影响;以... 详细信息

为研究发动机气门油封结构参数对油封密封性能的影响,在有限元分析基础上,对油面唇角、气面唇角、安装过盈、唇口圆角半径、弹簧刚度等结构参数进行正交试验设计,研究油封结构参数对气门油封唇口最大接触压力和单位周长径向力的影响;以最大接触压力和最小单位周长径向力为优化目标,获取气门油封最优参数组合。研究结果表明:油封唇口圆角半径对油封唇口最大接触压力和单位周长径向力的影响程度都为最大;气面唇角对单位周长径向力有较显著的影响;油面唇角对油封唇口最大接触压力有较强的影响,但对单位周长径向力影响较小;弹簧刚度对单位周长径向力和最大接触压力影响均较小。结合均值最优水平分析,获得满足优化目标的油封参数组合,优化后油封比初始油封最大接触压力提升了85.61%,单位周长径向力降低了20.54%,在保证油封密封性的前提下,大大改善了油封唇口的磨损情况,提高了油封的使用寿命。

关键词：气门油封密封性能结构参数正交设计

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