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Mechanism of MSWI Fly Ash Solidified by Microbe Cement

Journal of Shanghai Jiaotong university(Science) 2020年第4期25卷 519-525页

作者： RONG Hui wei guanqi QIAN Chunxiang ZHANG Lei ZHANG Ying XU Rui School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China State Key Laboratory of High Performance Civil Engineering Materials Nanjing 210008China School of Materials Science and Engineering Southeast UniversityNanjing 211189China Engineering Research Centre of Construction Waste and Coal Waste Recycle Technology of Tianjin Tianjin 300384China Tianjin Key Laboratory of Civil Structure Protection and Reinforcement Tianjin 300384China

Microbe cement,a new type of gelling material,has attracted wide attention due to the increasing awareness of environmental *** this paper,the microbe cement in solidifying municipal solid waste incineration(MSWI)fly ash is investigated and the effect of the microbial induction method in solidifying MSWI fly ash is compared with the traditional chemical reaction strategy by characterizing the resulted calcite and the solidification productions with electronic universal testing machine,X-ray diffractometer(XRD),Fourier transform infrared spectrometer(FTIR),scanning electron microscope(SEM)and atomic absorption *** results show that the MSWI fly ash solidified by microbe cement has the highest compressive strength while that of the chemical CaCO3 products is the *** XRD results show that a new hydration gelling substance(Ca2SiO4·0.30H2O)is generated in the MSWI fly ash *** FTIR results show that the frequency of Si-O bonds and C-O bonds in the products solidified by microbe cement has shifted,while there is no change occurred in the chemical CaCO3 *** SEM results show that the microstructure of the products solidified by microbe cement is denser than that of chemical CaCO3 *** test results of heavy metals show that the microbe cement could reduce the leaching concentration of heavy metals in MSWI fly ***,the leaching concentration of Pb meets the standard requirements,while that of Cd is still slightly higher than the standard requirement.

关键词： microbe cement municipal solid waste incineration(MSWI) fly ash solidification mechanism

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工程开挖土的资源化再利用研究进展

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材料导报 2022年第13期36卷 124-132页

作者：魏冠奇王琰帅洪舒贤董必钦邢锋深圳大学土木与交通工程学院广东深圳518060

近年来,现代化城市建设逐步向下延伸,如地铁、隧道及地下多层建筑等,以扩大城市空间并实现土地资源的高效利用。然而,在这个建设过程中会产生大量工程开挖土(Excavated soil,ES)。目前,ES的处理问题已成为我国城市管理的一大难题。与此... 详细信息

近年来,现代化城市建设逐步向下延伸,如地铁、隧道及地下多层建筑等,以扩大城市空间并实现土地资源的高效利用。然而,在这个建设过程中会产生大量工程开挖土(Excavated soil,ES)。目前,ES的处理问题已成为我国城市管理的一大难题。与此同时,我国正处于基础设施的大量建设时期,势必会消耗大量自然资源。将ES作为原料替代部分不可再生资源,对于解决ES的产生和堆积量大、缓解地球资源紧张、保证可持续健康发展有重要意义。然而,ES的工程性较差,且其组成成分复杂多变,受地域因素的影响非常大,很难形成统一的生产规范。研究者们只能尽可能多地寻找合适的资源化再利用途径,同时尝试各种方法对ES进行处理,以提升其工程性。ES资源化再利用途径主要包括作为细骨料用于混凝土中、作为火山灰材料用于胶凝基体中、用于制备可控性低强度材料(CLSM)和煅烧制备建材产品。根据研究结果,通过对ES进行筛分、稳定化或改性处理,能够成功降低其塑性、显著提高其工程性;经低温煅烧后,ES具备火山灰活性,但其活性的高低主要取决于所含粘土矿物的种类和含量;以ES为原料制备CLSM最为简单,在国外早已得到了成功应用;通过添加合适的辅助材料,不同类型的ES均已被证实能够用于制备烧结砖或陶粒,但产品的档次主要取决于所用ES的质量。本文综述了近25年来有关ES资源化回收利用的研究。首先分析了ES的一般组成和特性,并指出了其工程性较差的原因;然后分类详述了目前主要存在的ES资源化再利用途径,同时总结了不同资源化再利用过程中所面临的问题和相应的解决办法;最后做出了综合性的评价并提出了一种合理的ES资源化再利用流程,以期为后续ES的研究提供参考。

关键词：工程开挖土回收利用工程性能细骨料煅烧火山灰活性

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基于FPGA的两阶段配电网拓扑实时辨识算法

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电力系统自动化 2024年第12期48卷 100-108页

作者：王冠淇裴玮李洪涛郝良马丽中国科学院电工研究所北京市100190 中国科学院大学电子电气与通信工程学院北京市100049 国网北京市电力公司北京市100031

对配电网拓扑进行准确的实时辨识是电力系统安全稳定运行的基础,但随着新能源的接入以及配电网规模不断增大,配电网拓扑结构的动态变化愈加频繁且难以辨识。然而,现有配电网拓扑辨识算法所使用的历史数据需要人工对其进行拓扑标注,且拓... 详细信息

对配电网拓扑进行准确的实时辨识是电力系统安全稳定运行的基础,但随着新能源的接入以及配电网规模不断增大,配电网拓扑结构的动态变化愈加频繁且难以辨识。然而,现有配电网拓扑辨识算法所使用的历史数据需要人工对其进行拓扑标注,且拓扑辨识时间长,难以实现配电网拓扑实时辨识。因此,文中提出了一种基于现场可编程逻辑门阵列(FPAG)的两阶段配电网拓扑结构实时辨识算法。该算法不需要预先给出配电网拓扑类别的数量,即可对已有历史数据进行相应的拓扑标注及分类,并且基于FPGA实现了对配电网拓扑的实时辨别。该算法分为2个阶段:第1阶段采用变分贝叶斯高斯混合模型,对已有历史数据进行相应的拓扑标注及分类;第2阶段采用麻雀搜索算法,使得支持向量机快速收敛得到最优参数,以实现对配电网拓扑结构的精准辨识。基于该算法,利用FPGA并行架构以及高速高密度特性建立了实时拓扑结构辨识平台。最后,通过算例分析验证了所提辨识方法的有效性和优越性。

关键词：配电网拓扑辨识现场可编程逻辑门阵列(FPGA) 变分贝叶斯高斯混合模型麻雀搜索算法支持向量机

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A low-frequency and broadband wave-insulating vibration isolator based on plate-shaped metastructures

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1171-1188页

作者： wei wei Feng GUAN Xin FANG College of Intelligent Science National University of Defense TechnologyChangsha410073China Naval Research Academy Beijing100161China

A metamaterial vibration isolator,termed as wave-insulating isolator,is proposed,which preserves enough load-bearing capability and offers ultra-low and broad bandgaps for greatly enhanced wave *** consists of plate-shaped metacells,whose symmetric and antisymmetric local resonant modes offer several low and broad mode bandgaps although the complete bandgap remains high and *** bandgap mechanisms,vibration isolation properties,effects of key parameters,and robustness to complex conditions are *** experimentally demonstrated,the wave-insulating isolator can improve the vibration insulation in the ranges of[50 Hz,180 Hz]and[260 Hz,400 Hz]by 15 dB and 25 dB,respectively,in contrast to the conventional isolator with the same first resonant frequency.

关键词： metamaterial and metastructure vibration isolation bandgap wave insulation plate

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微生物胶凝材料固结垃圾焚烧飞灰效果及机制

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材料导报 2019年第22期33卷 3757-3761,3767页

作者：荣辉魏冠奇张磊张颖徐蕊宁彩珍王雪平天津城建大学材料科学与工程学院天津300384 河海大学水文水资源与水利工程科学国家重点实验室南京210098 天津市建筑垃圾与燃煤废弃物利用技术工程中心天津300384 天津市土木建筑结构防护与加固重点实验室天津300384

针对当前利用普通硅酸盐水泥固结垃圾焚烧飞灰存在能耗大、环境污染严重等问题,采用微生物胶凝材料固结飞灰,研究其对飞灰的固结效果,并通过X射线衍射仪、扫描电子显微镜、红外光谱和原子吸收光谱等测试技术分析其固结飞灰的机制。研究... 详细信息

针对当前利用普通硅酸盐水泥固结垃圾焚烧飞灰存在能耗大、环境污染严重等问题,采用微生物胶凝材料固结飞灰,研究其对飞灰的固结效果,并通过X射线衍射仪、扫描电子显微镜、红外光谱和原子吸收光谱等测试技术分析其固结飞灰的机制。研究结果表明,不同的拌合介质(水、上清液、微生物溶液、化学碳酸钙、微生物胶凝材料、微生物胶凝材料和上清液、微生物胶凝材料和微生物溶液)均能将松散的飞灰颗粒固结为一个整体,但其中以微生物胶凝材料和上清液为介质拌制的飞灰固结体强度和重金属离子固化效果最优(Pb离子和Cd离子的固结率分别为33%和32%)。微生物胶凝材料具有双重固结飞灰的作用,一方面它与其他介质固结飞灰相同,均是在固结体内部形成了水化产物Ca 2SiO 4·0.30H 2O;另一方面,微生物胶凝材料中的有机基质能分别与飞灰和方解石中Si-O键、C-O键的O原子作用形成大量的分子间氢键。

关键词：垃圾焚烧飞灰微生物胶凝材料氢键固结

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Planet wind: Planetary evolution dominated by electromagnetic forces

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Science China Earth Sciences 2024年第10期67卷 3331-3336页

作者： Yong wei Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

1. Introduction Over the five centuries since Copernicus, the focus of planetary science has transitioned from the visible realm to the invisible. In the more than 60 years following the advent of the space age, our a... 详细信息

关键词： evolution dominated planetary

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The lithology and composition of lunar mantle modified by ilmenite bearing cumulate:A thermodynamic model

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Acta Geochimica 2024年第5期43卷 856-875页

作者： wei Huang wei Du State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China

Due to their high density,the ilmenite-bearing cumulates(IBC)(with or without KREEP)formed during the late-stage lunar magma ocean solidification are thought to sink into the underlying lunar mantle and trigger lunar mantle *** evidence implied that IBC may descend deep inside the Moon and remain as a partially molten layer at the core-mantle boundary(CMB).However,partial melting may have occurred on the mixed mantle cumulates during the sinking of IBC/KREEP and the silicate melt may be positively buoyant,thus preventing the IBC/KREEP layer from sinking to the ***,we perform thermodynamic simulation on the stability of lunar mantle cumulates at different depths mixed with different amounts of IBC/KREEP from an updated LMO *** modeling results suggest that the sinking of IBC/KREEP will cause at least 5 wt%partial melting in the shallow(~120 km)and a much larger degree of partial melting in the deep lunar mantle(~420 km).Due to the density contrast with the surrounding mantle,IBC/KREEP-bearing melts could potentially decouple under certain *** modified lunar mantle by sinking of IBC/KREEP can better explain the formation of different kinds of lunar basaltic magma than the primary lunar mantle formed through differentiation of lunar magma *** of IBC/KREEP back into the lunar mantle may introduce plagioclase,clinopyroxene,garnet,and incompatible radioactive elements into the deep lunar mantle,which will further affect the thermal and chemical evolution of the lunar interior.

关键词： Ilmenite-bearing cumulate KREEP Partial melting Lunar mantle overturn pMELTS

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Task-specific Part Discovery for Fine-grained Few-shot Classification

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Machine Intelligence Research 2024年第5期21卷 954-965页

作者： Yongxian wei Xiu-Shen wei School of Computer Science and Technology Nanjing University of Science and TechnologyNanjing210094China

Localizing discriminative object parts(e.g.,bird head)is crucial for fine-grained classification tasks,especially for the more challenging fine-grained few-shot *** work always relies on the learned object parts in a unified manner,where they attend the same object parts(even with common attention weights)for different few-shot episodic *** this paper,we propose that it should adaptively capture the task-specific object parts that require attention for each few-shot task,since the parts that can distinguish different tasks are naturally *** for a few-shot task,after obtaining part-level deep features,we learn a task-specific part-based dictionary for both aligning and reweighting part features in an ***,part-level categorical prototypes are generated based on the part features of support data,which are later employed by calculating distances to classify query data for *** retain the discriminative ability of the part-level representations(i.e.,part features and part prototypes),we design an optimal transport solution that also utilizes query data in a transductive way to optimize the aforementioned distance calculation for the final *** experiments on five fine-grained benchmarks show the superiority of our method,especially for the 1-shot setting,gaining 0.12%,8.56%and 5.87%improvements over state-of-the-art methods on CUB,Stanford Dogs,and Stanford Cars,respectively.

关键词： Fine-grained image recognition few-shot learning transductive learning visual dictionary part feature discovery

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Humic acid-mediated transport of a typical soil passivation remediation product(chloropyromorphite)in saturated porous media

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Journal of Environmental Sciences 2024年第7期141卷 51-62页

作者： Xinying Li Mengjia Zhang Siyuan Li wei wei School of Environment Jiangsu Engineering Lab of Water and Soil Eco-remediationJiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response TechnologyNanjing Normal UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Conversion of labile Pb species into chloropyromorphite(CPY)using phosphorus-bearing amendments was considered to be an ideal strategy in soil passivation ***,the fate and transport of CPY in the soil are poorly *** study aims to fill the knowledge gap by evaluating the fate and transport of CPY under environmentally relevant conditions of humic acid(HA),pH,electrolyte concentration,and species through the saturated sandy *** showed that bare CPY colloids are basically immobile in sandy porous media while the co-existence of HA made the transport of CPY improved by30%-93.5%.Facilitated transport of CPY was attributed to the increased stability of CPY and the repulsive interaction between CPY particles and sands due to HA *** mobility of CPY was also increased with increasing pH from 5.0 to *** the pH was 9 with a10 mmol/L NaCl background solution,the stronger energy barrier between CPY and sand led to enhanced transport *** divalent Ca^(2+)had a more dramatic effect than monovalent Na^(+)on the aggregation and sedimentation of CPY colloids due to its effectivescreening of the surface charge of CPY and bridging interaction with CPY ***-LandauVerwey-Overbeek theory and attachment efficiency calculation indicated that high energy barriers were responsible for the high mobility of CPY colloids,while the retention of CPY in sands was mainly caused by secondary energy minimum and physically *** findings of this work can help to evaluate the fate of soil passivation remediation products in natural water and soil.

关键词： Chloropyromorphite DLVO theory Stability Saturated porous medium Transport

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The Existence of a Meridional Curve in Closed Incompressible Surfaces in Fully Alternating Link Complements

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Chinese Annals of Mathematics,Series B 2024年第1期45卷 73-80页

作者： wei LIN School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

Menasco showed that a closed incompressible surface in the complement of a non-split prime alternating link in S^(3) contains a circle isotopic in the link complement to a meridian of the *** on this result,he was able to argue the hyperbolicity of non-split prime alternating links in *** et *** that if F■S×I\L is an essential torus,then F contains a circle which is isotopic in S×I\L to a meridian of *** author generalizes his result as follows:Let S be a closed orientable surface,L be a fully alternating link in S×I\If F ■ S×I\L is a closed essential surface,then F contains a circle which is isotopic in S×I\L to a meridian of L.

关键词： Fully alternating Incompressible surfaces Meridionally incompressible

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