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Nitrate Dynamics Constrained by Dual Isotopes and Sensor from Karst CZ

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Nitrate Dynamics Constrained by Dual Isotopes and Sensor fro...

Enhanced Strength-Ductility Synergy in Submerged Friction Stir Processing ER2319 Alloy Manufactured by Wire-Arc Additive Manufacturing via Creating Ultrafine Microstructure

中国矿物岩石地球化学学会第17届学术年会

作者： Siliang Li fujun yue Susan Waldron David M.Oliver Xi Chen Institute of Surface-Earth System Science Tianjin University School of Geographical and Earth Sciences University of Glasgow Biological & Environmental Sciences Faculty of Natural Sciences University of Stirling

＜正＞The critical zone （CZ）, the dynamic living skin of the Earth, extends from the top of the vegetative canopy through the soil and down to fresh bedrock and the bottom of the *** Anthropocene with its rapid incr...

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 793-807页

作者： Jinpeng Hu Tao Sun fujun Cao Yifu Shen Zhiyuan Yang Chan Guo College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China

Submerged friction stir processing(SFSP)with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc *** a result,uniform and ultrafine grained(UFG)structure with average grain size of 0.83μm was achieved with the help of sharply reduced heat input and holding time at elevated *** optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%.Specifically,grain refinement strengthening and decentralized θ(Al_(2)Cu)phase in the sample subjected to SFSP made great contributions to the enhanced *** addition,the decrease in residual stresses and removal of pores substantially enhance the *** rates of cooling and low temperature cycling,which are facilitated by the water-cooling environment throughout the machining process,are vital in obtaining superior *** work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.

关键词： Submerged friction stir processing Wire-arc additive manufacturing Al-Cu alloy Residual stress Strengthening and toughening mechanism Ultrafine grained microstructure

Delineating homogeneous domains of fractured rocks using topological manifolds and deep learning

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2996-3013页

作者： Yongqiang Liu Jianping Chen fujun Zhou Jiewei Zhan Wanglai Xu Jianhua Yan College of Construction Engineering Jilin UniversityChangchun130026China China Railway First Survey and Design Institute Group Co. Ltd.Xi’an710043China College of Geological Engineering and Geomatics Chang’an UniversityXi’an710054China

Determining homogeneous domains statistically is helpful for engineering geological modeling and rock mass stability *** this text,a technique that can integrate lithology,geotechnical and structural information is proposed to delineate homogeneous *** technique is then applied to a high and steep slope along a ***,geological and geotechnical domains were described based on lithology,faults,and shear ***,topological manifolds were used to eliminate the incompatibility between orientations and other parameters(*** length and roughness)so that the data concerning various properties of each discontinuity can be matched and characterized in the same Euclidean ***,the influence of implicit combined effect in between parameter sequences on the homogeneous domains could be *** learning technique was employed to quantify abstract features of the characterization images of discontinuity properties,and to assess the similarity of rock mass *** results show that the technique can effectively distinguish structural variations and outperform conventional *** can handle multisource engineering geological information and multiple discontinuity *** technique can also minimize the interference of human factors and delineate homogeneous domains based on orientations or multi-parameter with arbitrary distributions to satisfy different engineering requirements.

关键词： Homogeneous domain Geological domain Geotechnical domain Structural domain Topological manifold Deep learning

Highly polar CoP/Co_(2)P heterojunction composite as efficient cathode electrocatalyst for Li-air battery

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Chinese Chemical Letters 2024年第9期35卷 486-490页

作者： Miaomiao Li Mengwei Yuan Xingzi Zheng Kunyu Han Genban Sun fujun Li Huifeng Li Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Center for Advanced Materials Research Beijing Normal UniversityZhuhai 519087China

In order to advance the commercialization of rechargeable Li-air batteries,it is of importance to explore cathode catalyst with efficient catalytic *** metal oxides have poor electrical conductivity,while cobalt phosphide has excellent electrical conductivity and large specific surface ***,its application in organic Li-air batteries has been much less studied,and the electrocatalytic activity desires to be further ***,CoP/Co_(2)P heterojunction composite with higher polarity was *** discharge product of high-polarity CoP/Co_(2)P had a new porous box-like morphology,which was easy to be decomposed and exposed more active *** highly polar CoP/Co_(2)P heterostructure composite had homogeneous pores,the synergistic effect existed between CoP and Co_(2)P,and the discharge product was porous box mixed with Li_(2)O_(2)and LiOH,which made CoP/Co_(2)P achieve high specific capacity of14632 m Ah/g and cycle stably 161 times when used as air electrode cathode *** work furnished a thought for the construction of cathode catalysts with efficient catalytic activity for Li-air batteries.

关键词： Li-air battery Cathode catalyst CoP/Co_(2)P Heterojunction structure High polarity

Plastid engineering with an efficient RNAi delivery system based on bacteriophage MS2 virus-like particles enhances plant resistance to cotton bollworm

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Molecular Plant 2024年第7期17卷 987-989页

作者： Chunmei Jiang Jinqiu Fu fujun Li Kai Xia Shengchun Li Ling Chang Ralph Bock Jiang Zhang State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life SciencesHubei Hongshan LaboratoryHubei UniversityWuhan 430062China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureKey Laboratory of Synthetic BiologyMinistry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen518000China Max-Planck-Institut fur Molekulare Pflanzenphysiologie Am Muhlenberg 114476Potsdam-GolmGermany

Dear Editor,RNA-based pesticides are approaching the market,offering great potential to control agricultural pests such as the coleopteran insect Diabrotica virgifera virgifera(Head et al.,2017).However,application to lepidopteran pests has been hampered by their inconsistent response to RNA interference(RNAi).As a notorious lepidoptera pest,Helicoverpa armigera feeds on over 300 species of host plants(Fu et al.,2022).Although transgenicplants expressingdouble-stranded RNAs or microRNAs that target essential insect genes can inhibit the growth of larvae,complete protection of the plants and efficient killing of this insect have not been achieved(Bally et al.,2020;Chung et al.,2021;Li et al.,2023).The relatively low RNAi efficiency in lepidopterans is mainly attributable to the degradation and intracellular sequestration of double-stranded RNA(Shukla et al.,2016;Zhu and Palli,2020).To overcome these obstacles and improve RNAi efficiency in ***,we attempted to deliver RNAi molecules using a bacteriophage MS2 virus-like particle(VLP)-based delivery system(Wang et al.,2016).

关键词： overcome offering approaching

雨季喀斯特小流域氮输出特征及其受降雨的影响

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水土保持学报 2017年第3期31卷 73-78页

作者：曾杰吴起鑫李思亮岳甫均贵州大学国土资源部喀斯特环境与地质灾害重点实验室贵阳550025 中国科学院地球化学研究所贵阳550081 School of Geographical and Earth Sciences University of Glasgow Glasgow G12 8QQUnited Kingdom

以黔中典型喀斯特农业小流域后寨河流域为研究区域,探讨喀斯特小流域氮素输出形态特征及降雨对氮素输出的影响。通过对流域内落水洞、地表水和地下水水样各形态氮素的浓度进行监测,估算雨季氮素输出量,结合降雨量数据分析氮输出受降雨... 详细信息

以黔中典型喀斯特农业小流域后寨河流域为研究区域,探讨喀斯特小流域氮素输出形态特征及降雨对氮素输出的影响。通过对流域内落水洞、地表水和地下水水样各形态氮素的浓度进行监测,估算雨季氮素输出量,结合降雨量数据分析氮输出受降雨的影响。结果表明:(1)后寨河喀斯特小流域水体氮含量明显高于我国主要河流,流域地下水出口溶解性总氮(TDN)浓度均值为6.5mg/L;地表水出口TDN浓度均值为7.3mg/L。(2)氮素输出的主要形态为硝态氮(NO_3^--N),铵态氮(NH_4^+-N)、亚硝态氮(NO2--N)以及有机态氮(DON)输出占比极低。(3)流域内TDN,NO_3^--N,NH_4^+-N,NO2--N,DON雨季输出量估算值分别为55.13,52.12,0.40,0.01,2.61t。(4)持续性的多日降雨加速了水体氮素流失强度,流域上游水体硝态氮浓度在降雨事件发生后呈上升趋势,随着降雨事件的停止而呈下降趋势;流域总出口因降雨而产生的硝态氮浓度变化具有一定的滞后性。

关键词：喀斯特后寨河流域氮输出降雨

喀斯特系统生物地球化学循环及对全球变化的响应

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中国岩溶 2022年第3期41卷 465-476页

作者：刘鑫李思亮岳甫均钟君覃蔡清丁虎天津大学地球系统科学学院天津300072 西安交通大学人居环境与建筑工程学院陕西西安710049

生物地球化学循环是地球系统物质循环的核心,是维系地表生态系统稳定和人类社会可持续发展的重要基础。然而,气候变化以及人类的过度干扰可能会显著改变表层地球系统中的生物地球化学循环过程,尤其是脆弱的喀斯特生态系统。特殊的多孔... 详细信息

生物地球化学循环是地球系统物质循环的核心,是维系地表生态系统稳定和人类社会可持续发展的重要基础。然而,气候变化以及人类的过度干扰可能会显著改变表层地球系统中的生物地球化学循环过程,尤其是脆弱的喀斯特生态系统。特殊的多孔隙关键带结构也加速了喀斯特地区物质循环及其对外界环境变化的响应,影响了不同尺度的物质循环和生物地球化学过程。本研究主要综述了宏观尺度(气候变化)、中尺度(人类活动)和微观尺度(微生物活动)的环境变化对喀斯特地区生物地球化学循环的影响。结果表明多要素变化导致喀斯特地区物质循环受到强烈影响,气候变化、人类活动和微生物活动及其耦合关系对喀斯特地区生物地球化学循环的调控作用具有重要意义。最后,本研究强调了现有研究的局限性并指出未来研究的挑战与方向,即未来应从系统研究(如地球关键带)的视角出发,将多尺度观测-分析与综合模型集成研究并举,从而构建多源多尺度耦合的过程和系统模型,进而为阐明喀斯特系统的演变规律和动力学机制、实现喀斯特地区的生态保护和高质量发展提供理论基础。

关键词：喀斯特系统气候变化人类活动微生物活动生物地球化学循环

SSA-over-array(SSoA):A stacked DRAM architecture for nearmemory computing

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Journal of Semiconductors 2024年第10期45卷 42-53页

作者： Xiping Jiang fujun Bai Song Wang Yixin Guo Fengguo Zuo Wenwu Xiao Yubing Wang Jianguo Yang Ming Liu Institute of Microelectronics of the Chinese Academy of Sciences Beijing 100029China School of Integrated Circuits University of Chinese Academy of SciencesBeijing 100029China Xi’an UniIC Semiconductors Xi’an 710075China School of Microelectronics University of Science and Technology of ChinaHefei 230026China

Aiming to enhance the bandwidth in near-memory computing,this paper proposes a SSA-over-array(SSoA)*** relocating the secondary sense amplifier(SSA)from dynamic random access memory(DRAM)to the logic die and repositioning the DRAM-to-logic stacking interface closer to the DRAM core,the SSoA overcomes the layout and area limitations of SSA and master DQ(MDQ),leading to improvements in DRAM data-width density and frequency,significantly enhancing bandwidth *** quantitative evaluation results show a 70.18 times improvement in bandwidth per unit area over the baseline,with a maximum bandwidth of 168.296 Tbps/*** believe the SSoA is poised to redefine near-memory computing development strategies.

关键词： near-memory vertical stacking SSA bandwidth density

喀斯特关键带溶解性碳的迁移转化过程及其对降雨事件的响应

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第四纪研究 2021年第4期41卷 1128-1139页

作者：覃蔡清李思亮岳甫均丁虎徐胜刘丛强西安交通大学人居环境与建筑工程学院陕西西安710049 天津大学地球系统科学学院天津300072 中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550081

喀斯特地区良好的水文连通性和丰富的碳酸盐岩使喀斯特关键带碳循环过程十分活跃,并对全球气候变化具有快速响应。为解析流量-溶解性碳浓度-碳同位素(Q-C-I)之间的动态关系以及喀斯特关键带重要的碳生物地球化学过程,本研究在降雨过程... 详细信息

喀斯特地区良好的水文连通性和丰富的碳酸盐岩使喀斯特关键带碳循环过程十分活跃,并对全球气候变化具有快速响应。为解析流量-溶解性碳浓度-碳同位素(Q-C-I)之间的动态关系以及喀斯特关键带重要的碳生物地球化学过程,本研究在降雨过程中对中国西南典型喀斯特流域———陈旗流域内的雨水、穿林雨、山坡径流、地表水和泉水进行了同步高频采集。结果表明,雨水中的溶解性无机碳(DIC)浓度很低,对地表水和泉水的整体贡献小。地表水和泉水中的DIC浓度随流量增加均表现出“溶质恒定(chemostatic)”行为,生物降解来源的CO_(2)是主要调控因素,其相对贡献比在采样期间随流量增加而上升,而碳酸盐岩以及大气CO_(2)的贡献相对较低且在水文变化时波动较小。流量相同时泉水中的DIC浓度及其单位时间的输出量均高于地表水。相比而言,雨水中的溶解性有机碳(DOC)浓度在穿过植被冠层后能上升1倍左右,在随径流从山坡运输到流域洼地的过程中也有上升趋势。地表水和泉水中的DOC浓度均随流量增加而增加,具有积聚效应,在运输过程中主要靠陆源补给,其输出量受控于与降雨情况有关的运输限制。因此,不同赋存形态碳在水文变化中的响应具有差异性,相互之间的转化也可能会改变流域的碳归趋行为。整体而言,流域内强烈的碳酸盐岩风化和农业活动对碳循环、气候以及水环境都会产生潜在影响。未来需要深入研究溶解性碳相互转换的时间尺度和控制机制及其在地表-地下运移过程中与喀斯特关键带结构的相互作用机理。

关键词：喀斯特关键带溶质恒定溶解性碳的动态响应碳酸盐岩风化稳定碳同位素