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Science China Earth Sciences 2024年第9期67卷 2824-2844页

作者： Hongyu WANG Shuanhong ZHANG Sen WANG linghao kong Yue ZHAO Qiqi ZHANG Sen GAO Guohui HU Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China SinoProbe Laboratory Chinese Academy of Geological SciencesBeijing 100037China School of Earth Science and Mineral Resources China University of GeosciencesBeijing 100083China

The Great Oxidation Event(GOE)during the early Paleoproterozoic represents the first significant buildup in Earth’s atmospheric oxygen and resulted in a series of significant changes in the Earth’s surface *** them is the 2.22(or 2.33)–2.06 Ga Lomagundi-Jatuli Event(LJE),which is globally,the largest magnitude and longest duration,marine carbonate positive carbon isotope excursion(δ^(13)C_(V-PDB)>10‰)*** event has attracted the attention of scholars all over the ***,except for a high positive carbon isotope excursion(δ^(13)C_(V-PDB)>10‰)recently identified from marine carbonate rocks within the Daposhan Formation in the lower Fanhe Group(or the Sanchazi Group)in the Longgang Block in the northeast North China Craton(NCC),Paleoproterozoic carbonates in the NCC are characterized by a low-amplitude positive carbon isotope excursion(δ^(13)C_(V-PDB)10‰)of marine carbonate rocks occurred at about 2.15 *** co

关键词： Lomagundi-Jatuli Event(LJE) Great Oxidation Event(GOE) Carbon-oxygen isotopes Liaohe Group Marine carbonate Jiao-Liao-Ji Belt North China Craton

轨道交通装备用混合动力包构型与能量管理策略

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重庆大学学报 2024年第1期47卷 52-68页

作者：类延磊孔令昊胡明辉陈爽孟凡杰重庆大学机械与运载工程学院重庆400044 重庆大学机械传动国家重点实验室重庆400044 中车大连机车研究所有限公司辽宁大连116021

搭载传统燃油动力包的内燃动车组是运行在非电气化轨道交通中的主力机型,存在效率低、油耗高的缺点。针对这一问题,设计了一种轨道交通装备用混合动力包的构型方案,建立了混合动力动车组的数学模型,分析了不同模式下该构型方案的运行状... 详细信息

搭载传统燃油动力包的内燃动车组是运行在非电气化轨道交通中的主力机型,存在效率低、油耗高的缺点。针对这一问题,设计了一种轨道交通装备用混合动力包的构型方案,建立了混合动力动车组的数学模型,分析了不同模式下该构型方案的运行状态,结合整车线路运行条件,提出了一种基于动态规划算法的能量管理策略。仿真结果表明,在该能量管理策略控制下,装备混合动力包的动车组相较于纯燃油动车组燃油经济性提升了32.11%。

关键词：轨道交通装备混合动力包能量管理策略燃油经济性

Selective recovery of Cu(II) from strongly acidic wastewater by zinc dimethyldithiocarbamate: Affecting factors, efficiency and mechanism

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Journal of Environmental Sciences 2023年第7期129卷 115-127页

作者： Xin Yang Xingyun Hu linghao kong Xianjia Peng State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The selective recovery of copper from strongly acidic wastewater containing mixed metal ions remains a significant *** this study,a novel reagent zinc dimethyldithiocarbamate(Zn(DMDC)_(2))was developed for the selective removal of Cu(II).The removal efficiency of Cu(II)reached 99.6%after 120 min reaction at 30°C when the mole ratio Zn(DMDC)_(2)/Cu(II)was 1:*** mechanism investigation indicates that the Cu(DMDC)_(2) products formed as a result of the displacement of Zn(II)from the added Zn(DMDC)_(2) by Cu(II)in wastewater,due to the formation of stronger coordination bonds between Cu(II)and the dithiocarbamate groups of Zn(DMDC)_(2).Subsequently,we put forward an innovative process of resource recovery for strongly ***,the selective removal of Cu(II)fromactualwastewater using Zn(DMDC)_(2),with a removal efficiency of 99.7%.Secondly,high-value CuO was recovered by calcining the Cu(DMDC)_(2) at 800°C,with a copper recovery efficiency of 98.3%.Moreover,the residual As(III)and Cd(II)were removed by introducing H_(2)S gas,and the purified acidic wastewater was used to dissolve ZnO for preparation of valuable ZnSO_(4)·H_(2)*** total economic benefit of resource recovery is estimated to be 11.54$/m^(3).Accordingly,this study provides a new route for the resource recovery of the treatment of copper-containing acidic wastewater.

关键词： Strongly acidic wastewater Zinc dimethyldithiocarbamate Copper Selective Recovery

Removal of Ni(Ⅱ) from strongly acidic wastewater by chelating precipitation and recovery of NiO from the precipitates

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Journal of Environmental Sciences 2021年第6期33卷 365-375页

作者： Xin Yang Xianjia Peng linghao kong Xingyun Hu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Strongly acidic wastewater produced in nonferrous metal smelting industries often contains high concentrations of Ni(Ⅱ), which is a valuable metal. In this study, the precipitation of Ni(Ⅱ) from strongly acidic wastewater using sodium dimethyldithiocarbamate(DDTC) as the precipitant was evaluated. The effects of various factors on precipitation were investigated, and the precipitation mechanism was also identified. Finally, the nickel in the precipitates was recovered following a pyrometallurgical method. The results show that, under optimised conditions(DDTC:Ni(Ⅱ) molar ratio = 4:1;temperature = 25 ℃), the Ni(Ⅱ) removal efficiency reached 99.3% after 10 min. In strongly acidic wastewater, the dithiocarbamate group of DDTC can react with Ni(Ⅱ) to form DDTC –Ni precipitates. Further recovery experiments revealed that high-purity Ni O can be obtained by the calcination of DDTC –Ni precipitates, with the nickel recovery efficiency reaching 98.2%. The gas released during the calcination process was composed of NO_(2), CS_(2), H_(2)O, CO_(2), and SO_(2). These results provide a basis for an effective Ni(Ⅱ) recovery method from strongly acidic wastewater.

关键词： Strongly acidic wastewater Ni(Ⅱ) Recovery Chelation Precipitation

Clean and effective removal of Cl(-I)from strongly acidic wastewater by PbO_(2)

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Journal of Environmental Sciences 2022年第10期34卷 1-8页

作者： Jinmin Zhao linghao kong Xingyun Hu Xianjia Peng State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Recycling strongly acidic wastewater as diluted H_(2)SO_(4) after contaminants contained being removed was previously proposed,however,Cl(-I),a kind of contaminant contained in strongly acidic wastewater,is difficult to remove,which severely degrades the quality of recycled H_(2)SO_(4).In this study,the removal of Cl(-I)using PbO_(2) was investigated and the involved mechanisms were *** removal efficiency of Cl(-I)reached 93.38%at 50℃ when PbO_(2)/Cl(-I)mole ratio reached 2:*** identification of reaction products shows that Cl(-I)was oxidized to Cl_(2),and PbO_(2) was reduced to PbSO_(4).Cl_(2) was absorbed by NaOH to form NaClO,which was used for the regeneration of PbO_(2) from the generated PbSO_(4).Cl(-I)was removed through two pathways,i.e.,surface oxidation and•OH radical oxidation.•OH generated by the reaction of PbO_(2) and OH−plays an important role in Cl(-I)*** regenerated PbO_(2) had excellent performance to remove Cl(-I)after six-time *** study provided an in-depth understanding on the effective removal of Cl(-I)by the oxidation method.

关键词： Cl(-I)removal Strongly acidic wastewater Cl•radicals •OH radicals PbO_(2)regeneration

Reprogramming cell fates by small molecules

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Protein & Cell 2017年第5期8卷 328-348页

作者： Xiaojie Ma linghao kong Saiyong Zhu Life Sciences Institute Zhejiang University Hangzhou 310058 China

Reprogramming cell fates towards pluripotent stem cells and other cell types has revolutionized our under- standing of cellular plasticity. During the last decade, transcription factors and microRNAs have become powerful reprogramming factors for modulating cell fates. Recently, many efforts are focused on repro- gramming cell fates by non-viral and non-integrating chemical approaches. Small molecules not only are useful in generating desired cell types in vitro for vari- ous applications, such as disease modeling and cell- based transplantation, but also hold great promise to be further developed as drugs to stimulate patients＇ endogenous cells to repair and regenerate in vivo. Here we will focus on chemical approaches for generating induced pluripotent stem cells, neurons, cardiomy- ocytes, hepatocytes and pancreatic is cells. Significantly, the rapid and exciting advances in cellular reprogramming by small molecules will help us to achieve the long-term goal of curing devastating diseases, injuries, cancers and aging.

关键词： reprogramming small molecules stem cells cell fates

Adsorptive removal of nitrogen-containing compounds from fuel by metal-organic frameworks

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Journal of Energy Chemistry 2013年第6期22卷 869-875页

作者： Zhaoyang Wang Zhiguo Sun linghao kong Gang Li State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology

The adsorptive denitrogenation from fuels over three metal-organic frameworks(MIL-96(Al),MIL-53(Al)and MIL-101(Cr))was studied by batch adsorption *** nitrogen-containing compounds(NCCs)pyridine,pyrrole,quinoline and indole were used as model NCCs in fuels to study the adsorption *** physicochemical properties of the adsorbents were characterized by XRD,N2physical adsorption,FT-IR spectrum and Hammett indicator *** metal-organic frameworks(MOFs),especially the MIL-101(Cr)containing Lewis acid sites as well as high specific surface area,can adsorb large quantities of NCCs from *** addition,the adsorptive capacity over MIL-101(Cr)will be different for NCCs with different *** stronger basicity of the NCC is,the more it can be absorbed over MIL-101(Cr).Furthermore,pore size and shape also affect the adsorption capacity for a given adsorbate,which can be proved by the adsorption over MIL-53(Al)and MIL-96(Al).The pseudo-second-order kinetic model and Langmuir equation can be used to describe kinetics and thermodynamics of the adsorption process,***,the regeneration of the used adsorbent has been conducted successfully by just washing it with ethanol.

关键词： metal-organic framework nitrogen-containing compound adsorptive denitrogenation denitrogenation kinetics denitrogenation thermodynamics

Tribological properties of nanometer cerium oxide as additives in lithium grease

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Journal of Rare Earths 2018年第2期36卷 209-214页

作者： Qiang He Anling Li Yachen Guo Songfeng Liu Yong Zhang linghao kong Department of Mechanical Engineering Anyang Institute of Technology

This paper presents a comparative study of the influence of nanometer-CeO_2（nano-CeO_2） and temperature on tribological and lubricating properties of lithium grease. The morphology and structure of nanocrystals were characterized by means of transmission electron microscopy（TEM） and X-ray diffraction（XRD）, respectively. Friction and wear tests were conducted on the friction and wear *** show that the lithium grease with addition of nanometer-CeO_2 has much better friction-reducing and anti-wear performance than that of base grease. When the additive in grease is 0.6 wt%, the friction coefficient（COF） and wear scar diameter（WSD） decrease by 28% and 13% comparing with base grease,respectively. The base grease and grease with 0.6 wt% nanometer-CeO_2 both possess the lowest average COF and wear width at 50 ℃. The worn surface morphology after friction test was analyzed by scanning electron microscopy（SEM） and NANOVEA three-dimensional profilometer. Under the lubrication of the lithium grease containing 0.6 wt% nano-CeO_2. few shallow furrows can be observed on the quite smoothed surface and the WSD decreased. Moreover, It was found that the nano-CeO_2 has been incorporated into the surface protective and lubricious layer by energy dispersive spectrometer（EDS） analysis.

关键词： Nano-CeO2 Tribological properties Lithium grease Worn surface Rare earths Additive

Thermo-oxidative ageing behavior of cerium oxide/silicone rubber

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Journal of Rare Earths 2020年第4期38卷 436-444页

作者： Qiang He Guangfei Wang Yong Zhang Zhanjun Li linghao kong Wei Zhou Key Laboratory of Aeronautical Special Rubber Anyang Institute of TechnologyAnyang 455000China College of Quality and Technical Supervision Hebei UniversityBaoding 071002China

Cerium oxide/silicon rubber was prepared via mechanical *** and frictional properties,as well as thermal stability after thermo-oxidative ageing were investigated in this rubber composite.3D surface profilometry,scanning electron microscopy(SEM)and thermogravimetry analysis(TGA)were used to study the friction surface characteristics,friction mechanism and thermal stability,***,swelling experiments were carried out to investigate the variation of crosslinking *** thermo-oxidative ageing,the tear strength of cerium oxide/silicon rubber ***,in the early ageing stage,improvements in tensile strength,elongation at break,and frictional performance are caused by crosslinking density ***,the addition of cerium oxide remarkably improves the re-cross linking degree during ageing process,which in turn decreases the number of holes on the friction surface and endows the silicon rubber with better mechanical and frictional properties,as well as thermo-oxidative ageing resistance.

关键词： Cerium oxide/silicone rubber Thermo-oxidative ageing Mechanical property Frictional property Thermal stability Rare earths

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双极板设备用内置式永磁同步电机结构优化

重型机械 2024年第3期 83-89,94页

作者：孔令豪张芳萍齐永坤赵富强太原科技大学重型机械教育部工程研究中心山西太原030024

为了有效地提高永磁同步电机的转矩性能和降低齿槽转矩,选取48槽、8极的内置式永磁同步电机为例,在不改变转子径向半径的前提下,选取转子的关键参数作为优化参数,基于田口算法对内置式永磁同步电机进行多目标优化,在有效降低齿槽转矩的... 详细信息

为了有效地提高永磁同步电机的转矩性能和降低齿槽转矩,选取48槽、8极的内置式永磁同步电机为例,在不改变转子径向半径的前提下,选取转子的关键参数作为优化参数,基于田口算法对内置式永磁同步电机进行多目标优化,在有效降低齿槽转矩的基础上增大内置式永磁同步电机的转矩性能。在优化基础上,对空载运行、额定负载、最高转速3种永磁同步电机典型的运转工况进行有限元仿真。数据结果表明:齿槽转矩峰峰值从1.8 N·m降低至0.9 N·m,额定负载下的平均电磁转矩从73.17 N·m增长至77.12 N·m,最高转速运行下的平均电磁转矩从37.3 N·m增长值38.42 N·m,分别实现了提高永磁同步电机转矩性能和降低齿槽转矩的目标。

关键词：内置式永磁同步电机田口法多目标优化