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Desulfurization of rejected electrolytic manganese metal by electroslag remelting furnace with a water-cooled electrode

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Journal of Iron and Steel Research International 2023年第7期30卷 1411-1425页

作者： Ru Lu Ran-ran yu Guang-qiang Li yu Liu Qiang Wang Hai-chuan Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Remelting rejected electrolytic manganese metal (EMM) scrap was investigated by electroslag remelting (ESR) process through industrial experiment. The results indicated that the ANF-6 slag (70 wt.% CaF_(2) + 30 wt.% Al_(2)O_(3)) and deoxidizer could promote the desulfurization of ESR manganese in an air atmosphere. Under an air atmosphere, the sulfur in the ingot decreased to 0.0534 wt.% with a desulfurization ratio of ESR manganese of 53.2% by using ANF-6 slag and water-cooled copper electrode electroslag remelting rejected EMM scrap, suggesting its efficient removal. The electroslag ingots exhibited uneven chemical composition in an air atmosphere and cooling condition of the ESR process. The metal manganese could be oxidized by electroslag remelting of rejected EMM scrap in an air atmosphere with MnO content in the final slag of 21.9 wt.%. Besides, the activity of MnO in slag increased with increasing remelting temperature, resulting in a reduction in the slag–manganese sulfur partition ratio and desulfurization ratio. Moreover, with the accumulation of sulfur in slag and the oxidation of metallic manganese liquid, the slag showed a lower cleanliness and more oxidation, leading to an increase in sulfur and oxygen content in the electroslag ingot with the increase in ingot height.

关键词： Rejected electrolytic manganese metal scrap Desulfurization Electroslag remelting Thermodynamics

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基于雨水截流率的合流制改造措施研究

环境污染与防治 2024年第8期46卷 1213-1219页

作者：曹秀芹禹然洪国渊杨超城市雨水系统与水环境省部共建教育部重点实验室北京100044 北京建筑大学环境与能源工程学院北京100044 北京城市排水集团有限责任公司北京100124

合流制溢流污染控制是中国当前城市排水系统(尤其是在密度大和改造难的老城区)所面临的一项急迫且艰巨的重要任务。为削减溢流污染且充分发挥原有设施的调控能力,建立一套经济可行的合流制改造措施至关重要。基于水环境容量,以雨水截流... 详细信息

合流制溢流污染控制是中国当前城市排水系统(尤其是在密度大和改造难的老城区)所面临的一项急迫且艰巨的重要任务。为削减溢流污染且充分发挥原有设施的调控能力,建立一套经济可行的合流制改造措施至关重要。基于水环境容量,以雨水截流率作为污染控制指标,联合当量降雨强度确定截流调蓄总量,利用MIKE Urban的时间—面积模型构建某大城市老城区排水系统的水力水质模型,通过对截流、调蓄改造进行可行性与经济性分析,制定原有截流设施保持不变、增设水泵限流装置、新建4 mm降雨量调蓄池的改造方案。模拟改造后,雨水截流率由58.9%提高到85.3%,不仅简化了截流调蓄改造的计算,增强其普适性,还进一步提高了截蓄两者的联动性,在满足污染控制要求的同时更直观地体现溢流污染控制效果,对老城区更合理高效地开展合流制改造具有指导意义。

关键词：雨水截流率水环境容量当量降雨强度 MIKE Urban 参数率定

Effects of initial velocity on the sinking of ilmenite-bearing cumulates in the early lunar mantle:Insight from the theory of Rayleigh-Taylor instability

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Research in Astronomy and Astrophysics 2021年第1期21卷 207-219页

作者： Shuo-ran yu Xiao-Ping Zhang State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao SARChina

The early lunar mantle overturn,associated with the sinking of the dense ilmenite-bearing cumulate(IBC)crystallized at the shallow lunar mantle,provides satisfactory explanations for the origination of high-Ti basalt,the abnormally strong magnetic field between~3.9 and~3.6 Ga and the low-viscosity zone in the deep lunar mantle,but still poses a debate regarding the initial state of IBC in the early lunar *** the sinking of IBC initiated before the end of lunar magma ocean crystallization,the solidified IBC can acquire a greater thickness and a higher initial velocity at the IBC-mantle *** variation of initial velocity can affect the strain rate of IBC and,correspondingly,the dislocation creep components at the shallow lunar *** this work,we analyze the effects of initial velocity on the dynamics of early lunar mantle by using the theory of Rayleigh-Taylor *** couple the effects of diffusion creep and dislocation creep for all major minerals in the lunar mantle,we exploit an improved Minimized Power Geometric(IMPG)model and isostress mixing model to characterize the upper limit and lower limit for the viscosity of the lunar mantle comprising four major minerals,***,orthopyroxene,clinopyroxene and *** modeling results suggest that a high initial velocity,in any case,can shorten the onset time,tending to promote the early lunar mantle overturn even in a rheologically-strong lunar *** effect of initial velocity on the overturn wavelength shows a strong dependence on the rheological mixing *** the isostress mixing model,the increase of initial velocity tends to elongate the overturn *** the IMPG mixing model,the overturn wavelength is insensitive to the variation of initial *** the actual lunar mantle rheology sandwiches between the rheologies predicted by isostress mixing model and IMPG model,it can be anticipated that the increase of initial velocity tends to elongate the overturn waveleng

关键词： planets and satellites:Moon planets and satellites:interiors planets and satellites:tectonics planets and satellites:composition

原发系统型间变性大细胞淋巴瘤中TOP2A基因及蛋白表达的研究

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诊断病理学杂志 2024年第3期31卷 221-225,230页

作者：刘然王晓红于冉宫丽平北京市平谷区医院病理科北京101200 潍坊护理职业学院基础医学院山东潍坊261000 首都医科大学基础医学院病理学系北京100069

目的研究原发系统型间变性大细胞淋巴瘤(ALCL)中TOP2A基因改变与TOP2A蛋白的表达,并阐述其临床病理学意义。方法收集58例ALCL患者蜡块,运用免疫组化技术及免疫荧光原位杂交(FISH)技术分别检测TOP2A蛋白表达及TOP2A基因拷贝数的变化,并... 详细信息

目的研究原发系统型间变性大细胞淋巴瘤(ALCL)中TOP2A基因改变与TOP2A蛋白的表达,并阐述其临床病理学意义。方法收集58例ALCL患者蜡块,运用免疫组化技术及免疫荧光原位杂交(FISH)技术分别检测TOP2A蛋白表达及TOP2A基因拷贝数的变化,并做相关统计。结果TOP2A蛋白阳性表达者约70%(41/58例),TOP2A基因扩增者约50%(26/50例)。TOP2A蛋白表达及TOP2A基因扩增同临床分期Ⅲ~Ⅳ、IPI评分高危组及Ki-67增殖指数较高组成正相关(P<0.05)。结论TOP2A与ALCL的发生、发展及肿瘤的增殖密切相关,TOP2A蛋白阳性表达及TOP2A基因扩增的患者生存时间反而较长。

关键词：间变性大细胞淋巴瘤拓扑异构酶Ⅱα 免疫组化荧光原位杂交

最优尺度下新安江流域景观生态安全格局及其影响因素

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安徽农业大学学报（社会科学版） 2024年第2期33卷 112-123页

作者：於冉魏靖阳储昭君安徽农业大学国土资源研究所安徽合肥230036 安徽农业大学经济管理学院安徽合肥230036

新安江流域作为首个跨省生态补偿政策试点,其政策实施对于地区城市整体生态治理具有正向促进作用,分析新安江流域城市政策实施前、中、后期的景观生态风险时空演变趋势及驱动因素,可为该地区及同类区域生态治理及风险防范提供科学支撑... 详细信息

新安江流域作为首个跨省生态补偿政策试点,其政策实施对于地区城市整体生态治理具有正向促进作用,分析新安江流域城市政策实施前、中、后期的景观生态风险时空演变趋势及驱动因素,可为该地区及同类区域生态治理及风险防范提供科学支撑。基于2000、2010、2020年三期土地利用遥感数据,寻求评价景观生态风险的最优尺度,分析其时空演变趋势,并借助地理探测器计算空间因子的影响程度。研究表明:研究区最优研究尺度为粒度70 m、幅度11 km;2000—2020年,研究区景观生态风险显著降低,较高以上风险区面积大幅缩减,生态风险呈显著的空间正相关性,且相关程度不断减弱,高值聚集区逐渐减少;研究区内土地利用强度与坡度对景观生态风险驱动效应最强,各因子交互探测时可显著提高解释能力。研究区各市景观生态风险空间差异显著,需加强对草地、水域景观整体性的维护,进一步加强新安江流域城市生态稳定性,同时应考虑地区用地结构及风险状况,针对性采取风险治理措施。

关键词：尺度效应景观生态风险时空演变地理探测器新安江流域城市

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账户养老金运营方式的国际比较与借鉴

山西师大学报(社会科学版) 2024年第06期51卷 51-59页

作者：孙永勇冉东玉华中师范大学公共管理学院

与传统的现收现付制度相比，个人账户基金需获取高于人口与工资增长率的收益率才具有优势。因此，账户养老金计划下基金运营是账户养老金计划可持续发展的关键所在。从美国、澳大利亚等8个国家的情况看，账户养老金的运营大致可以被划... 详细信息

与传统的现收现付制度相比，个人账户基金需获取高于人口与工资增长率的收益率才具有优势。因此，账户养老金计划下基金运营是账户养老金计划可持续发展的关键所在。从美国、澳大利亚等8个国家的情况看，账户养老金的运营大致可以被划分为两类：一类是政府不直接介入运营，另一类是政府强力介入运营。但不论是哪一类，各个国家都根据本国具体情况做出了不同选择。我国养老金体系的三个支柱中都存在账户养老金，其运营都面临着亟须解决的基本问题。借鉴国外经验，结合本国具体国情，可以为解决我国账户养老金运营面临的基本问题提出一些政策建议。

关键词：养老基金账户养老金计划运营方式国际比较政策建议

Isolation and application of predatory Bdellovibrio-and-like organisms for municipal waste sludge biolysis and dewaterability enhancement

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Frontiers of Environmental Science & Engineering 2017年第1期11卷 99-109页

作者： ran yu Shiwen Zhang Zhoukai Chen Chuanyang Li Key Laboratory of Energy Thermal Conversion and Control (Ministry of Education) Department of Environmental Science and Engineering School of Energy and Environment Southeast University N anjing 210096 China

Bdellovibrio-and-like organisms （BALOs） are a group of ubiquitous and obligate predatory bacteria and conmlonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs encouraged municipal waste sludge biolysis pretreatment technique was developed and investigated for dewaterability enhancement of excess waste sludge. The indigenous predatory BALOs were successfully isolated from the sludge for biolysis treatment. Without any chemical addition or pH adjustment, the sludge specific resistance （SRF） and capillary suction time （CST） were significantly reduced by as high as 53.4% and 23.8%, respectively within 24 h＇s treatment, which would further be lowered with the increase of BALOs input dosage. However, the continuous extension of reaction time would women the sludge dewaterability. The decreases of SRF and CST accompanied with the increases of sludge disintegration degree and soluble chemical oxygen demand, nitrogen, and phosphorus concentrations all emphasized the contributions of BALOs＇ predation activities to sludge disturbance, cell lysis, and consequently the release of sludge intracellular water to finally effectively improve the sludge dewaterability and disposal efficiency.

关键词： Bdellovibrio-and-like organisms (BALOs) Biolysis Activated sludge Dewaterability Predation

An optimized two-step derivatization method for analyzing diethylene glycol ozonation products using gas chromatography and mass spectrometry

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Journal of Environmental Sciences 2017年第3期29卷 313-321页

作者： ran yu Lei Duan Jingkun Jiang Jiming Hao State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

The ozonation of hydroxyl compounds （e.g., sugars and alcohols） gives a broad range of products such as alcohols, aldehydes, ketones, and carboxylic adds. This study developed and optimized a two-step derivatization procedure for analyzing polar products of aldehydes and carboxylic acids from the ozonation of diethylene glycol （DEG） in a non-aqueous environment using gas chromatography-mass spectrometry. Experiments based on Central Composite Design with response surface methodology were carried out to evaluate the effects of derivatization variables and their interactions on the analysis. The most desirable derivati- zation conditions were reported, i.e., oximation was performed at room temperature overnight with the o-（2,3,4,5,6-pentafluorobenzyl） hydroxyl amine to analyte molar ratio of 6, silylation reaction temperature of 70℃, reaction duration of 70 min, and N,O-bis（trimethylsilyl）- trifluoroacetamide volume of 12.5 μL. The applicability of this optimized procedure was verified by analyzing DEG ozonation products in an ultrafine condensation particle counter simulation system.

关键词： Gas chromatography-massspectrometryResponse surface methodologyCentral Composite DesignDiethylene glycol ozonation

Antimicrobial and antifouling surfaces through polydopamine bio-inspired coating

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Rare Metals 2022年第2期41卷 499-518页

作者： Yi-Wen Zhu yu-Jie Sun Ju-Lin Wang Bing-ran yu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Biomedical Materials of Natural Macromolecules Ministry of EducationBeijing University of Chemical TechnologyBeijing 100029China Laboratory of Biomedical Materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Laboratory of Electrochemical Process and Technology for Materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

The increasing antibiotic treatment failure is attributed to the increasing emergence of drug-resistant bacteria,and the attachment of these bacteria to the surface of implantation materials often leads to dangerous bacterial biofilm formation on the implant ***,this creates an urgent need to develop new antibacterial material and antifouling ***(PDA),as a musselinspired material,has many advantageous properties,such as a simple preparation procedure,excellent hydrophilicity and biocompatibility,strong adhesive performance,easy functionalization,outstanding photothermal conversion effect,and strong quenching *** has increasingly attracted much interest not only for its adherence to virtually all types of surfaces but also as it provides a simple and versatile approach to functionalize material surfaces to obtain a variety of multifunctional *** this review,we mainly focus on the preparation and polymerization mechanism of PDA systems and then provide a compilation of several reports on the PDA surface modification of various nanomaterials and material surfaces,including metals,metal oxides,carbons,and ***,we summarize the advantages and disadvantages of polydopamine surface-modified nanomaterials.

关键词： Polydopamine(PDA) Adhesion Modification Antibacterial Antifouling