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Particuology 2024年第8期91卷 106-117页

作者： Junchao Xu Zhipeng Zhang Li Lv Yunfei Zhang yiming xie Huaqiang Chu School of Energy and Environment Anhui University of TechnologyMaanshan243002China College of Mechanical and Electrical Engineering China Jiliang UniversityHangzhou310018China

Water vapor nucleation on particle's surface plays an important role in dust removal,cloud formation,and particle ***,the selectivity of nucleation sites and the nucleation characteristic of water molecule on the particle's surface are still unclear,especially for the aggregated *** this paper,the effects of particle wettability and aggregation modes on the selectivity of nucleation sites and the nucleation characteristics were investigated using molecular dynamics *** results were compared with our earlier experimental *** illustrates how the contact angle of clusters,the growth velocity,and the growth duration are all influenced by the interaction coefficient between water and ***,the nucleation sites of water molecules on the particle aggregation surface exhibit a definite *** primary indicator of this selectivity is the preferential nucleation of water molecules at the interfaces of linear chain aggregation particles,at the inner side of non-linear chain aggregation particles,and at the centers of ring *** results are in good agreement with our previous experimental *** significantly,additional research has revealed that subcritical-size clusters typically aggregate on two-particle surfaces spacing when the spacing smaller than the critical cluster size.

关键词： Heterogeneous nucleation Water molecule Wettability Aggregation modes Molecule dynamics

Oxygen self-doping pyrolyzed polyacrylic acid as sulfur host with physical/chemical adsorption dual function for lithium-sulfur batteries

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Chinese Chemical Letters 2024年第7期35卷 473-479页

作者： Yan Wang Huixin Chen Fuda Yu Shanyue Wei Jinhui Song Qianfeng He yiming xie Miaoliang Huang Canzhong Lu Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityXiamen 361021China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China

Lithium-sulfur(Li-S)batteries with high theoretical capacity and energy density need to solve problems such as the high decomposition energy barrier of Li_(2)S and large volume change of sulfur in the charging process caused by the shuttle effect before practical ***,a green synthesis method is used to prepare polyacrylic acid(PAA)superabsorbent material,and then the pyrolyzed PAA(P/PAA)material is obtained as the positive electrode of Li-S *** functional calculation reveals that the oxygen self-doping pyrolyzed polyacrylic acid(P/PAA)delivered stronger binding energy toward Li2S species in carbonyl C=O than that of graphite powder(GP)which are-1.58 eV and-1.02 eV,*** with the distribution of relaxation time analysis and the in-situ electrochemical impedance approach,it is further demonstrated that the designed P/PAA as sulfur host plays a physical/chemical adsorption dual function in maintaining the stability and rate performance of *** an initial discharge capacity of 1258 mAh/g at 0.1 C and a minimal capacity decline of 0.05%per cycle even after 800 cycles at 0.5 C,the produced cathode demonstrated outstanding electrochemical *** average Coulombic efficiency is nearly 100%.The P/PAA electrodes may typically retain 96%of their capacity while declining on average only 0.033%per cycle after 130 cycles at 3 *** effort provides a new method for the future development of heteroatomic self-doping superabsorbent with promising adsorption properties for polysulfides as cathode materials of Li-S batteries.

关键词： Polyacrylic acid Oxygen self-doping Green synthetic Pore mesh polymer cathodes Lithium-sulfur batteries

云南腾冲高分异花岗岩锂、铷的工艺矿物学特征

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中南大学学报（自然科学版） 2024年第3期55卷 982-993页

作者：欧阳黎明李欢周剑琪谢一鸣刘飚中南大学地球科学与信息物理学院有色金属成矿预测与地质环境监测教育部重点实验室湖南长沙410083 湖南省国土空间调查监测所湖南长沙410129

为了厘定云南腾冲地区白垩世高分异花岗岩锂、铷的赋存状态以及工艺矿物学特征,并为区域关键金属综合利用提供解决方案,选取水城矿区代表性花岗岩为研究对象,利用扫描电镜、能谱仪及矿石自动测定系统,开展单矿物化学成分、物相、元素赋... 详细信息

为了厘定云南腾冲地区白垩世高分异花岗岩锂、铷的赋存状态以及工艺矿物学特征,并为区域关键金属综合利用提供解决方案,选取水城矿区代表性花岗岩为研究对象,利用扫描电镜、能谱仪及矿石自动测定系统,开展单矿物化学成分、物相、元素赋存状态、矿物嵌布粒度等岩矿相学及工艺矿物学研究。研究结果表明:Li主要赋存在云母类矿物中,Rb主要赋存在长石以及云母类矿物中;云母主要为铁锂云母,其次为白云母,多为形态较规则的片状,与长石、石英相互之间的镶嵌关系较简单;长石以钾长石居多,其次为钠长石,均与云母的镶嵌关系较简单,预计经适度磨矿后云母与长石即可获得较充分的解离;经理论计算,云母精矿产率为5.76%~6.60%;Li_(2)O和Rb_(2)O的品位分别为0.62%~0.73%和0.53%~0.55%;Li_(2)O和Rb_(2)O的回收率分别为91.11%~91.30%和38.20%~39.56%。云母具有不均匀中细粒嵌布的特点,所以选择74μm的磨矿细度较为适宜,此时样品中95%左右的云母可获得解离。云母与石英、长石相互之间的结合力相对较低,有利于磨矿过程中矿物的解离,因此,实际选矿过程中选择的磨矿细度可适度放粗。云南腾冲地区花岗岩中锂、铷等关键金属具有较好的综合回收利用价值,应引起充分重视。

关键词：关键金属元素赋存状态综合利用高分异花岗岩锂铷矿石

Phase noise filtering and phase unwrapping method based on unscented Kalman filter

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Journal of Systems Engineering and Electronics 2011年第3期22卷 365-372页

作者： Xianming xie yiming Pi School of Electronic Engineering University of Electronic Science and Technology of ChinaChengdu 611731P.R.China

This paper presents a new phase unwrapping algorithm based on the unscented Kalman filter（UKF） for synthetic aperture radar（SAR） *** method is the result of combining an UKF with path-following strategy and an omni-directional local phase slope *** technique performs simultaneously noise filtering and phase unwrapping along the high-quality region to the low-quality region,which is also able to avoid going directly through the noisy *** addition,phase slope is estimated directly from the sample frequency spectrum of the complex interferogram,by which the underestimation of phase slope is *** and real data processing results validate the effectiveness of the proposed method,and show a significant improvement with respect to the extended Kalman filtering（EKF） algorithm and some conventional phase unwrapping algorithms in some situations.

关键词： phase unwrapping unscented Kalman filter(UKF) path-following strategy.

景观人类学视角下遗产阐释体系建构与多元认知研究——以苏州园林为例

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风景园林 2024年第10期31卷 17-27页

作者：周详刘雅旭谢伊鸣常婧超东南大学建筑学院首都经济贸易大学马克思主义学院

【目的】将景观人类学置于“三位一体”架构下,通过打造联通多元主体的遗产阐释体系,衔接“自上而下”的权威话语体系与“自下而上”的大众话语体系。【方法】将世界文化遗产苏州园林选作研究对象,以景观人类学视角切入,从外部群体的客... 详细信息

【目的】将景观人类学置于“三位一体”架构下,通过打造联通多元主体的遗产阐释体系,衔接“自上而下”的权威话语体系与“自下而上”的大众话语体系。【方法】将世界文化遗产苏州园林选作研究对象,以景观人类学视角切入,从外部群体的客位“空间生产”与地方社会的主位“场所建构”两个维度,探讨基于“超位-高位-本位”3种价值立场的遗产话语阐释方式。其中,超位-高位分析利用官方文本挖掘来构建权威话语体系下的遗产价值评估框架;本位分析则从游客和居民视角出发,利用数字足迹和半结构访谈挖掘苏州园林“外部景观”与“内部景观”所表征的主体自我建构过程。【结果】苏州园林的遗产阐释体系不仅呈现出一种内在关联的“三位一体”构架,还通过整合遗产阐释的内外视角链接了遗产话语中的宏大叙事与地方表达,折射出不同文化主体对世界遗产的生产和塑造。【结论】景观人类学视角下基于多元认知建构的遗产阐释体系,不仅完善了苏州园林作为世界文化遗产的立体形象,对于遗产保护的公众化与社会化转型亦有特殊意义与时代价值。

关键词：文化遗产景观人类学遗产话语遗产阐释价值评估景观认知

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拜登政府国防科技战略评析

情报杂志 2024年第6期43卷 47-53,46页

作者：龙坤文力浩解一鸣杨爱华国防大学国家安全学院北京100091 国防科技大学军政基础教育学院长沙410073

[研究目的]科学分析拜登政府出台的国防科技战略,为我国国防科技发展提供参考。[研究方法]采用文本分析等方法,对拜登政府国防科技战略进行深入考察,分析其战略动因、主要内容、显著特点、潜在影响和现实挑战,并据此提出应对之策。[研... 详细信息

[研究目的]科学分析拜登政府出台的国防科技战略,为我国国防科技发展提供参考。[研究方法]采用文本分析等方法,对拜登政府国防科技战略进行深入考察,分析其战略动因、主要内容、显著特点、潜在影响和现实挑战,并据此提出应对之策。[研究结论]拜登政府出台国防科技战略,旨在通过聚焦联合任务、加快创新转化、夯实研发基础等战略手段,塑造美国在国防科技领域的新一轮优势,捍卫美国军事霸权。这一战略有着“重竞争、全政府、非对称”的鲜明特点,将恶化国际安全环境,在实行过程中仍面临国内动员、国际协调、人才吸引等多方面挑战。对此,我们要从加快推进高水平科技自立自强和强化国际合作两方面做好应对。

关键词：拜登政府国防科技战略战略竞争关键和新兴技术文本分析法

基于CFD计算域分区耦合技术的航空微型溢流阀流固耦合全域数值计算

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航空学报 2024年第15期45卷 65-81页

作者：朱嘉兴李奕宁牛世勇田一松李頔解一鸣航空工业西安飞行自动控制研究所西安710065

飞机液压作动系统微型插装式溢流阀具有微形流道结构,内部瞬时流体输运规律及诱发两相流的机制尚不明确,产品特性参数对性能的影响尚未明晰,亟需发展相关的仿真模型进行分析研究并开展实验验证工作。以某航空液压作动系统用微型插装式... 详细信息

飞机液压作动系统微型插装式溢流阀具有微形流道结构,内部瞬时流体输运规律及诱发两相流的机制尚不明确,产品特性参数对性能的影响尚未明晰,亟需发展相关的仿真模型进行分析研究并开展实验验证工作。以某航空液压作动系统用微型插装式溢流阀为研究对象进行了仿真和试验研究。在仿真计算时,考虑了阀芯运动造成的溢流阀全域结构变化以及边界条件迁移的影响,在流固耦合的基础上提出了一种针对该型溢流阀流道结构的CFD计算域分区耦合技术,并以此完成了全域数值计算模型的建模工作。基于全空化模型、湍流模型和阀芯动力学计算模型,该CFD仿真模型可实现对溢流阀全工作周期内瞬态特性的准确模拟,可得到流体压力场、流体速度场、空化相变特性及运动组件动力学特性随阀芯动作的动态衍变规律。另一方面,搭建了溢流阀性能试验台用于验证仿真模型的正确性。并基于代理模型技术构建了CFD模型输入输出之间映射关系的Kriging模型,极大提升了原模型的计算效率。将其应用于较大计算规模的模型评估,以此进行了启闭及流量特性参数对输入参数的全局灵敏度分析。最后,以结果指导产品研制过程的优化。结果表明:该型溢流阀的启闭过程连续、迅速且稳定,可有效保障系统安全。仿真得到的压力-流量结果与试验数据较为吻合,全周期内最大误差保持在5%以内。弹簧特性和位移限制位置对溢流阀的启闭特性产生较大影响,需要在研制过程进行重点关注。本文工作有助于深入理解微型插装溢流阀内部复杂流动机理,可对其研制过程形成理论指导,对其所处液压作动系统的运行可靠性和稳定性提升具有较为重要的价值。

关键词：微型阀 CFD 流固耦合瞬态流场特性灵敏度分析

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济南某地铁线路深基坑降水施工技术

建筑机械化 2024年第3期45卷 98-101页

作者：李好懿谢一鸣张平昆明理工大学国土资源工程学院云南昆明650032

以济南地铁某线路区间浅层地下水条件下深基坑降水工程为研究对象,综合分析工程和水文地质条件,制定了基坑降水布置与施工方案,结合地区惯例和涌水量计算方法,明确适用于济南地区的降水井数量、深度和布置方案,探讨降水对降水影响和数... 详细信息

以济南地铁某线路区间浅层地下水条件下深基坑降水工程为研究对象,综合分析工程和水文地质条件,制定了基坑降水布置与施工方案,结合地区惯例和涌水量计算方法,明确适用于济南地区的降水井数量、深度和布置方案,探讨降水对降水影响和数值模拟应用,为应对复杂水文地质条件下的深基坑施工提供参考。

关键词：深基坑降水施工涌水量计算

浅析沿海高风压地区不锈钢金属屋面的抗风揭技术

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工程质量 2024年第1期42卷 77-80页

作者：孙小强高辰冬谢一鸣中建二局安装工程有限公司北京100176

建筑屋面的两大基本功能为抗风、抗渗,常规屋面已经有相当成熟的技术与应用,但不锈钢金属屋面属于新工艺,其独特的安装工艺与材料性能需要进行讨论与分析。通过介绍平潭海洋国际会展中心项目不锈钢金属屋面系统的应用,重点阐述了关于不... 详细信息

建筑屋面的两大基本功能为抗风、抗渗,常规屋面已经有相当成熟的技术与应用,但不锈钢金属屋面属于新工艺,其独特的安装工艺与材料性能需要进行讨论与分析。通过介绍平潭海洋国际会展中心项目不锈钢金属屋面系统的应用,重点阐述了关于不锈钢金属屋面抗风揭技术的理论分析与施工方法。

关键词：不锈钢金属屋面抗风揭技术

Tea-derived carbon materials as anode for high-performance sodium ion batteries

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Chinese Chemical Letters 2023年第4期34卷 519-525页

作者： Huayan Wang Huixin Chen Chi Chen Miao Li yiming xie Xingcai Zhang Xianwen Wu Qiaobao Zhang Canzhong Lu Engineering Research Center of Environment-Friendly Function Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityXiamen 361021China CAS key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138United States School of Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States Xiamen Key Laboratory of Rare Ear School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China

Sodium-ion batteries(SIB) have attracted widespread attention in large-scale energy storage fields owing to the abundant reserve in the earth and similar properties of sodium to lithium. Biomass-based carbon materials with low-cost, controllable structure, simple processing technology, and environmental friendliness tick almost all the right boxes as one of the promising anode materials for SIB. Herein, we present a simple novel strategy involving tea tomenta biomass-derived carbon anode with enhanced interlayer carbon distance(0.44 nm) and high performance, which is constructed by N,P co-doped hard carbon(Tea-1100-NP) derived from tea tomenta. The prepared Tea-1100-NP composite could deliver a high reversible capacity(326.1 m Ah/g at 28 m A/g), high initial coulombic efficiency(ICE = 90% at 28 m A/g),stable cycle life(262.4 m Ah/g at 280 m A/g for 100 cycles), and superior rate performance(224.5 m Ah/g at 1400 m A/g). Experimental results show that the excellent electrochemical performance of Tea-1100-NP due to the high number of active N,P-containing groups, and disordered amorphous structures provide ample active sites and increase the conductivity, meanwhile, large amounts of microporous shorten the Na+diffusion distance as well as quicken ion transport. This work provides a new type of N,P co-doped high-performance tomenta-derived carbon, which may also greatly promote the commercial application of SIB.

关键词： Tea tomenta Co-doped Hard carbon Initial coulombic efficiency Sodium-ion batteries