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Enhancing electrochemical capacity and interfacial stability of lithium-ion batteries through side reaction modulation with ultrathin carbon nanotube film and optimized lithium cobalt oxide particle size

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Nano Research 2024年第8期17卷 7230-7241页

作者： wei xi xiaogang xia Jiacheng Zhu Dehua Yang Sishen xie Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and ***,its application has been limited by relatively low capacity and stability at high *** particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate ***,side reactions are simultaneously enhanced as the specific surface area ***,we investigate the impact of LCO particles with varying size distributions and optimize the particle *** modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UCNF)is introduced to coat the cathode *** this simple process and optimized particle size,the rate performance improves significantly,normal commercial LCO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 C(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 C(0.99 mA·h·cm^(−2))was achieved with high-voltage LCO(HVLCO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 *** the first time,UCNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LCO and electrolyte *** findings provide a simple method for improving LCO rate performance,especially at high C-rates.

关键词： lithium-ion batteries lithium cobalt oxides carbon nanomaterials side reactions

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Data-driven Predictive Voltage Control for Distributed Energy Storage in Active Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 1876-1886页

作者： Yanda Huo Peng Li Haoran Ji Hao Yu Jinli Zhao wei xi Jianzhong Wu Chengshan Wang School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China Digital Power Grid Research Institute China Southern Power GridGuangzhou 510630China School of Engineering Cardiff UniversityCardiff CF243AAU.K.

Integration of distributed energy storage(DES)is beneficial for mitigating voltage fluctuations in highly distributed generator(DG)-penetrated active distribution networks(ADNs).Based on an accurate physical model of ADN,conventional model-based methods can realize optimal control of ***,absence of network parameters and complex operational states of ADN poses challenges to model-based *** paper proposes a data-driven predictive voltage control method for ***,considering time-series constraints,a data-driven predictive control model is formulated for DES by using measurement ***,a data-driven coordination method is proposed for DES and DGs in each *** boundary information interaction,voltage mitigation effects can be improved by interarea coordination ***,control performance is tested on a modified IEEE 33-node test *** studies demonstrate that by fully utilizing multi-source data,the proposed predictive control method can effectively regulate DES and DGs to mitigate voltage violations.

关键词： Distribution network distributed energy storage(DES) distributed generators(DGs) data-driven predictive voltage control

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Fe/S oxidation-coupled arsenic speciation transformation mediated by AMD enrichment culture under different pH conditions

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Journal of Environmental Sciences 2024年第3期137卷 681-700页

作者： Yu-hang Zhou wei-xi Huang Zhen-yuan Nie Hong-chang Liu Yue Liu Can Wang Jin-lan xia Wen-sheng Shu Key Lab of Biometallurgy of Ministry of Education of China School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China School of Life Sciences South China Normal UniversityGuangzhou 510631China

Arsenic(As)speciation transformation in acid mine drainage(AMD)is comprehensively affected by biological and abiotic factors,such as microbially mediated Fe/S redox reactions and changes in environmental conditions(pH and oxidation-reduction potential).However,their combined impacts on arsenic speciation transformation remain poorly ***,we explored arsenic transformation and immobilization during pyrite dissolution mediated by AMD enrichment culture under different acidic pH *** results for incubation and mineralogical transformation of solid residues show that in the presence of AMD enrichment culture,pH 2.0,2.5,and 3.0 are more conducive to the formation of jarosites and ferric arsenate,which could immobilize high quantities of dissolved arsenic by adsorption and *** pH conditions significantly affect the initial adsorption of microbial cells to the minerals and the evolution of microbial community structure,further infuencing the biodissolution of pyrite and the release and oxidation process of Fe/*** results of Fe/S/As speciation transformation of the solid residues show that the transformation of Fe,S,and As in solution is mainly regulated by pH and potential values,which imposed significantly different effects on the formation of secondary minerals and thus arsenic oxidation and *** above results indicated that arsenic transformation is closely related to the Fe/S oxidation associated with pyrite bio-oxidation,and this correlation is critically regulated by the pH conditions of the system.

关键词： Acid mine drainage(AMD) pH conditions Fe/S/As speciation transformation Microbial community structure

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An Empirical Study on Foreign Language Majors’Needs for Ideological and Political Education Elements in Chinese Universities

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Journal of Literature and Art Studies 2024年第9期14卷 821-825页

作者： LI Ling LI Yue’e CAI wei-xi Shandong Agricultural University TaianShandong271000China

The paper takes 2076 undergraduate students majoring in foreign languages from 15 Chinese universities as the research subjects to investigate their demand for ideological and political education elements in foreign language *** results show that:(1)Students have high needs for ideological and political education elements in foreign language courses;(2)There are differences in students’needs for ideological and political education elements across different *** have higher demand for dimensions such as personal qualities,cultural literacy,moral cultivation,and patriotism,while their demand for dimensions related to constitutional law and political identity is relatively ***,foreign language majors in Chinese universities should optimize the supply of ideological and political education elements in their courses according to students’needs,and improve the effectiveness of moral education in these courses.

关键词： foreign language major ideological and political education elements needs analysis

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不同种植密度与灌溉定额对盐地碱蓬生长及吸盐量的影响

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草地学报 2024年第3期32卷 958-967页

作者：喜炜马莉新疆农业职业技术学院农业工程分院新疆昌吉831100

为了探究不同灌溉定额与种植密度对盐地碱蓬(Suaeda salsa)生长及吸盐量的影响,采用双因素试验设计[灌溉定额分别为2500 m^(3)·hm^(-2)(W1)、3500 m^(3)·hm^(-2)(W2)和4500 m^(3)·hm^(-2)(W3),盐地碱蓬种植密度分别为20株·m^(-2)(D1)、60株·m^(-2)(D2)、120株·m^(-2)(D3)]比较分析盐地碱蓬株高、茎粗、蓬径等生长指标和吸盐量对不同处理的响应。结果表明:灌溉水量和种植密度对盐地碱蓬生长、生物量、吸盐量和水分利用效率均有显著影响,两者交互效应极其显著;灌溉水量提高对盐地碱蓬株高、茎粗、蓬径具有促进作用,种植密度增加则对盐地碱蓬生长具有抑制作用,两者协调整体效益提高;W2D2的盐地碱蓬生物量最高,达到了24.02 t·hm^(-2),较W1D2和W3D2处理分别提高了33.84%和11.16%;W2D2吸盐量较W1D2和W3D2分别提高了16.48%和29.32%;W1D2处理的水分利用效率最高,较W2D2和W3D2处理分别提高了4.60%和49.50%。基于空间分析法的多目标优化,确定干旱区盐地碱蓬适宜灌溉定额为3227.77~3484.69 m^(3)·hm^(-2),适宜种植密度为50.34~83.27株·m^(-2)。

关键词：盐地碱蓬滴灌盐碱地灌溉定额种植密度

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Computer-assisted three-dimensional individualized extreme liver resection for hepatoblastoma in proximity to the major liver vasculature

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World Journal of Gastrointestinal Surgery 2024年第4期16卷 1066-1077页

作者： Wen-Li xiu Jie Liu Jing-Li Zhang Jing-Miao Wang Xue-Feng Wang Fei-Fei Wang Jie Mi xi-wei Hao Nanxia Qian Dong Department of Pediatric Surgery The Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina Department of Pediatric Surgery Yijishan Hospital of Wannan Medical CollegeWuhu 241000Anhui ProvinceChina Shandong Provincial Key Laboratory of Digital Medicine and Computer-assisted Surgery Shandong College Collaborative Innovation Center of Digital Medicine Clinical Treatment and Nutrition HealthQingdao UniversityQingdao 266003Shandong ProvinceChina

BACKGROUND The management of hepatoblastoma(HB)becomes challenging when the tumor remains in close proximity to the major liver vasculature(PMV)even after a full course of neoadjuvant chemotherapy(NAC).In such cases,extreme liver resection can be considered a potential *** To explore whether computer-assisted three-dimensional individualized extreme liver resection is safe and feasible for children with HB who still have PMV after a full course of *** We retrospectively collected data from children with HB who underwent surgical resection at our center from June 2013 to June *** then analyzed the detailed clinical and three-dimensional characteristics of children with HB who still had PMV after a full course of *** Sixty-seven children diagnosed with HB underwent surgical *** age at diagnosis was 21.4±18.8 months,and 40 boys and 27 girls were ***-nine(88.1%)patients had a single tumor,39(58.2%)of which was located in the right lobe of the liver.A total of 47 patients(70.1%)had PRE-TEXT III or ***-nine patients(58.2%)underwent delayed *** a full course of NAC,16 patients still had close PMV(within 1 cm in two patients,touching in 11 patients,compressing in four patients,and showing tumor thrombus in three patients).There were 6 patients of tumors in the middle lobe of the liver,and four of those patients exhibited liver anatomy *** 16 children underwent extreme liver resection after comprehensive preoperative *** procedures were performed according to the preoperative plan,and the operations were successfully ***,the 3-year event-free survival of 67 children with HB is 88%.Among the 16 children who underwent extreme liver resection,three experienced recurrence,and one died due to multiple *** Extreme liver resection for HB that is still in close PMV after a full course of NAC is both safe and *** approach not only reduces th

关键词： Children Hepatoblastoma Surgery Three-dimensional Computer-assisted

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Ecological environmental quality evaluation and driving factor analysis of the Lijiang River Basin,based on Google Earth Engine

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中国生态农业学报（中英文） 2024年第9期32卷 1592-1608页

作者： wei xi YANG Dazhi CAI xiangwen SHAO Ya TANG xiangling College of Earth Sciences Guilin University of TechnologyGuilin 541006China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

For regional ecological management,it is important to evaluate the quality of ecosystems and analyze the underlying causes of ecological *** the Google Earth Engine(GEE)platform,the remote sensing ecological index(RSEI)was calculated for the Lijiang River Basin in Guangxi Zhuang Autonomous Region for 1991,2001,2011,and *** autocorrelation analysis was employed to investigate spatiotemporal variations in the ecological environmental quality of the Lijiang River ***,geographic detectors were used to quantitatively analyze influencing factors and their interaction effects on ecological environmental *** results verified that:1)From 1991 to 2021,the ecological environmental quality of the Lijiang River Basin demonstrated significant *** area with good and excellent ecological environmental quality in proportion increased by 19.69%(3406.57 km^(2)),while the area with fair and poor ecological environmental quality in proportion decreased by 10.76%(1860.36 km^(2)).2)Spatially,the ecological environmental quality of the Lijiang River Basin exhibited a pattern of low quality in the central region and high quality in the ***,poor ecological environmental quality characterized the Guilin urban area,Pingle County,and Lingchuan County.3)From 1991 to 2021,a significant positive spatial correlation was observed in ecological environmental quality of the Lijiang River *** with high-high agglomeration were predominantly forests and grasslands,indicating good ecological environmental quality,whereas areas with low-low agglomeration were dominated by cultivated land and construction land,indicating poor ecological environmental quality.4)Annual average precipitation and temperature exerted the most significant influence on the ecological environmental quality of the basin,and their interactions with other factors had the great *** study aimed to enhance understanding of the evolution of the ecol

关键词： Ecological environmental quality Remote sensing ecological index Driving factor Google Earth Engine Lijiang River Basin

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牙隐裂的诊断流程与临床干预策略

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中华口腔医学杂志 2024年第8期59卷 863-870页

作者：韦曦蓝凯文中山大学附属口腔医院牙体牙髓病科·中山大学光华口腔医学院·广东省口腔医学重点实验室广州510055

牙隐裂是始于牙冠并可向龈下区域延伸的牙体不完全折裂。隐裂纹的隐匿性和复杂性给临床诊断、治疗及预后评估带来挑战。本文阐述了牙隐裂诊断、治疗及预后评估的研究进展,并提出牙隐裂诊断流程和临床干预策略,以期为临床诊疗和研究提供... 详细信息

牙隐裂是始于牙冠并可向龈下区域延伸的牙体不完全折裂。隐裂纹的隐匿性和复杂性给临床诊断、治疗及预后评估带来挑战。本文阐述了牙隐裂诊断、治疗及预后评估的研究进展,并提出牙隐裂诊断流程和临床干预策略,以期为临床诊疗和研究提供参考。

关键词：牙裂综合征牙隐裂诊断治疗预后危险因素

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基于改进联邦学习算法的电力负荷预测方法

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高电压技术 2024年第7期50卷 3039-3049页

作者：孙静彭勇刚倪旖旎韦巍蔡田田习伟浙江大学电气工程学院杭州310000 南方电网科学研究院有限责任公司广州510000

针对电力用户在数据隐私保护下的负荷预测问题,提出了基于改进联邦学习算法的电力负荷预测方法。首先,构建了基于横向联邦学习的多用户电力负荷预测框架,在此基础上,针对传统联邦学习算法预测精度不高、易受恶意攻击的问题,提出基于余... 详细信息

针对电力用户在数据隐私保护下的负荷预测问题,提出了基于改进联邦学习算法的电力负荷预测方法。首先,构建了基于横向联邦学习的多用户电力负荷预测框架,在此基础上,针对传统联邦学习算法预测精度不高、易受恶意攻击的问题,提出基于余弦相似度的优化局部模型更新与全局模型加权聚合方式的FedSTA(federated similaritytrainingandaggregation)算法。采用实际负荷数据的算例结果表明,所提框架训练出的全局模型具有可观的预测精度与一定的泛化能力。除此之外,与FedAvg算法、FedAdp算法相比,FedSTA算法训练出的全局模型精度有明显提升。最后,验证了FedSTA算法的鲁棒性和对受攻击客户端的识别能力,结果表明,该算法能准确识别受到攻击的客户端并赋予其较小的聚合权重,相较于FedAvg算法,全局模型预测精度受到的影响显著降低。

关键词：联邦学习电力负荷预测神经网络 FedSTA算法 CNN-LSTM 余弦相似度

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纳米光纤-半导体量子点分子耦合系统中光孤子的存储与读取

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物理学报 2024年第16期73卷 64-71页

作者：曾莹佘彦超张蔚曦杨红铜仁学院物理与电子工程系铜仁554300 吉首大学物理与机电工程学院吉首416000

本文解析研究了基于纳米光纤-半导体量子点分子耦合系统中时间光孤子存储和读取.结果表明,由于半导体量子点分子中点间隧穿诱导透明效应,系统中的光吸收被大大抑制.同时,纳米光纤的横向约束能增强光与系统的相互作用,增强的系统非线性... 详细信息

本文解析研究了基于纳米光纤-半导体量子点分子耦合系统中时间光孤子存储和读取.结果表明,由于半导体量子点分子中点间隧穿诱导透明效应,系统中的光吸收被大大抑制.同时,纳米光纤的横向约束能增强光与系统的相互作用,增强的系统非线性响应能平衡色散效应得到稳定的时间光孤子.进一步研究表明,通过关闭和打开点间隧穿耦合,系统中可实现光孤子的高效率和高保真度的存储与读取.上述结果对于固体量子材料中全光信息处理的实际应用具有一定的指导意义和潜在的应用价值.

关键词：隧穿诱导透明光孤子的存储和读取量子点纳米光纤

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