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Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4)/C cathode for lithium-ion batteries

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Journal of Energy Chemistry 2024年第4期91卷 619-627页

作者： Wei Lyu Wenlong Cai Tuan Wang Xiaobo Sun Enhao Xu Jinxuan chen Kaipeng Wu Yun Zhang College of Materials Science and Engineering Sichuan UniversityChengdu 610064SichuanChina

Mn-rich LiFe_(1-x)Mn_(x)PO_(4)(x>0.5),which combines the high operation voltage of LiMnPO_(4)with excellent rate performa nce of LiFePO4,is hindered by its sluggish kinetic ***,thermodynamic equilibrium analysis of Mn^(2+)-Fe^(2+)-Mg^(2+)-C_(2)O_(4)^(2-)-H_(2)O system is used to guide the design and preparation of insitu Mg-doped(Fe_(0.4)Mn_(0.6))_(1-x)Mg_(x)C_(2)O_(4)intermediate,which is then employed as an innovative precursor to synthesize high-performance Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4).It indicates that the metal ions with a high precipitation efficiency and the stoichiometric precursors with uniform element distribution can be achieved under the optimized thermodynamic ***,accelerated Li+diffusivity and reduced charge transfer resistance originating from Mg doping are verified by various kinetic *** from the contributions of inherited homogeneous element distribution,small particle size,uniform carbon layer coating,enhanced Li+migration ability and structural stability induced by Mg doping,the Li(Fe_(0.4)Mn_(0.6))_(0.97)Mg_(0.03)PO_(4)/C exhibits splendid electrochemical performance.

关键词： (Fe_(0.4)Mn_(0.6))_(1-x)MgxC_(2)0_(4) precursors Thermodynami cequilibrium Co-precipitation Mg doping Lithium-ion batteries

Review of the detasseling techniques for maize(Zea mays L.)hybrid seed production

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 1-11页

作者： Ruirui Zhang Jiaxuan Yang Liping chen chenchen Ding Longlong Li Linhuan Zhang National Research Center of Intelligent Equipment for Agriculture Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China National Center of International Research on Agricultural Aerial Application Technology Beijing 100097China Research Center of Intelligent Equipment Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China

Maize(Zea mays L.)is a critical staple crop globally,integral to human consumption,food security,and agricultural product *** quality and purity of maize seeds,essential for hybrid seed production,are contingent upon effective *** study investigates the evolution of detasseling technologies and their application in Chinese maize hybrid seed production,with a comparative analysis against the United States.A comprehensive examination of the development and utilization of detasseling technology in Chinese maize hybrid seed production was undertaken,with a specific focus on key *** from the United States were included for comparative *** analysis encompassed various detasseling methods,including manual,semi-mechanized,and cytoplasmic male sterility,as well as more recent innovations such as detasseling machines,and the emerging field of intelligent detasseling driven by unmanned aerial vehicles(UAVs),computer vision,and mechanical *** detasseling methods were predominantly employed by *** the challenges of inflexible and occasionally overlooked,applying detasseling machines is efficient and *** present,China’s detasseling operations in hybrid maize seed production are mainly carried out by manual work,which is labor-intensive and *** order to address this issue,China is dedicated to developing intelligent detasseling *** study emphasizes the critical role of detasseling in hybrid maize seed *** United States has embraced mechanized *** application and development of manual and mechanized detasseling were applied later than those in the United States,but latest intelligent detasseling technologies first appeared in *** detasseling is expected to be the future direction,ensuring the quality and efficiency of hybrid maize seed production,with implications for global food security.

关键词： detasseling technique detasseling machine UAVs intelligent agriculture maize hybrid seed production

Boosting rate performance of layered lithium-rich cathode materials by oxygen vacancy induced surface multicomponent integration

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Journal of Energy Chemistry 2024年第5期92卷 250-262页

作者： Youyou Fang Yuefeng Su Jinyang Dong Jiayu Zhao Haoyu Wang Yun Lu Bin Zhang Hua Yan Feng Wu Lai chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401120China Yibin Libode New Materials Co. Ltd.Yibin 64400SichuanChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083HunanChina

The rapid development of electric vehicles and portable energy storage systems demands improvements in the energy density and cost-effectiveness of lithium-ion batteries,a domain in which Lithium-rich layered cathode(LLO)materials inherently ***,these materials face practical challenges,such as low initial Coulombic efficiency,inferior cycle/rate performance,and voltage decline during cycling,which limit practical *** study introduces a surface multi-component integration strategy that incorporates oxygen vacancies into the pristine LLO material Li1.2Mn_(0.6)Ni_(0.2)O_(2).This process involves a brief citric acid treatment followed by calcination,aiming to explore rate-dependent degradation *** induced surface oxygen vacancies can reduce surface oxygen partial pressure and diminish the generation of O_(2)and other highly reactive oxygen species on the surface,thereby facilitating the activation of Li ions trapped in tetrahedral sites while overcoming transport ***,the formation of a spinel-like phase with 3D Li+diffusion channels significantly improves Li^(+)diffusion kinetics and stabilizes the surface *** optimally modified sample boasts a discharge capacity of 299.5 mA h g^(-1)at a 0.1 C and 251.6 mA h g^(-1)at a 1 C during the initial activation cycle,with an impressive capacity of 222.1 mA h g^(-1)at a 5 *** notably,it retained nearly 70%of its capacity after 300 cycles at this elevated *** straightforward,effective,and highly viable modification strategy provides a crucial resolution for overcoming challenges associated with LLO materials,making them more suitable for practical application.

关键词： Lithium-ion battery Layered lithium rich cathode Surface multicomponent integration Rate-dependent degradation and Li^(+) diffusion kinetics

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人工智能在胸部骨折CT诊断中的应用

广东医学 2024年第8期45卷 993-997页

作者：刘玉蒙吴若岱陆超吕云罡叶海陈靓周敏敏李光耀吴松雄吴光耀深圳大学总医院放射科广东深圳518055

目的探讨人工智能骨疾病诊断系统(AI)在胸部骨折中的诊断效能及应用价值。方法回顾性分析深圳大学总医院因创伤急诊就诊行胸部CT并经3~6周复查胸部CT证实的726例胸部骨折,计算AI和两名放射科医师以及放射科医师在AI辅助下对胸部骨折诊... 详细信息

目的探讨人工智能骨疾病诊断系统(AI)在胸部骨折中的诊断效能及应用价值。方法回顾性分析深圳大学总医院因创伤急诊就诊行胸部CT并经3~6周复查胸部CT证实的726例胸部骨折,计算AI和两名放射科医师以及放射科医师在AI辅助下对胸部骨折诊断的召回率、精确率和F1分数。结果AI检测肋骨骨折的召回率和F1分数分别为0.91和0.92,均高于放射科医师1(0.77与0.85)和放射科医师2(0.84与0.90),AI的精确率(0.92)低于放射科医师1(0.95)和放射科医师2(0.96)。放射科医师1和2在AI辅助下肋骨骨折检测的召回率、精确率和F1分数分别为0.94、0.95、0.94和0.97、0.98、0.97。AI检测胸部其他骨折的召回率和F1分数(0.90与0.90)高于放射科医师1(0.62与0.74)和放射科医师2(0.73与0.81),放射科医师1和2在AI辅助下,胸部其他骨折检测的召回率、精确率和F1分数分别为0.94、0.95、0.94和0.97、0.97、0.97。结论AI能高效高敏感地检测急诊创伤患者胸部CT中的胸部骨折,有望优化急诊创伤患者的诊疗流程。

关键词：体层摄影术胸部深度学习创伤急诊人工智能

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军民融合创新联合体：内涵、逻辑与进路

科技进步与对策 2024年第4期41卷 151-160页

作者：尹西明陈泰伦陈劲北京理工大学管理与经济学院北京市哲学社会科学融合发展研究基地浙江大学管理学院清华大学经济管理学院

军民融合是协同推进国防事业与经济建设的重要抓手，也是巩固提升一体化国家战略体系和能力的核心议题。面对新一轮科技革命与产业变革的加速演进，科技创新成为强化科技安全、保障经济安全和国防安全的关键纽带。针对我国军民融合协同... 详细信息

军民融合是协同推进国防事业与经济建设的重要抓手，也是巩固提升一体化国家战略体系和能力的核心议题。面对新一轮科技革命与产业变革的加速演进，科技创新成为强化科技安全、保障经济安全和国防安全的关键纽带。针对我国军民融合协同创新面临的新挑战与新使命，基于使命驱动型创新和整合式创新理论，提出面向高水平科技自立自强的军民融合创新联合体。系统解析军民融合创新联合体概念内涵、理论基础和典型特征，构建军民融合创新联合体基本架构，探讨强化军民国家战略科技力量体系化协同和整合式创新，积聚力量进行原创性引领性攻关，加快关键核心技术攻坚和场景化应用，以科技安全支撑经济、国防和新型国家安全的过程逻辑。提出以军民融合创新联合体为抓手，健全国家安全体系，以新安全格局保障新发展格局的路径与对策。

关键词：高水平科技自立自强军民融合创新联合体国家战略科技力量科技安全科技强国

福建番石榴环斑病菌的分离鉴定、生物学特性及抑制剂筛选

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果树学报 2024年第4期41卷 738-749页

作者：陈洪彬安莹莹陈蕾伊陈艺晖蒋璇靓林育钊泉州师范学院海洋与食品学院福建泉州362000 近海资源生物技术福建省高校重点实验室·泉州师范学院福建泉州362000 福建农林大学食品科学学院福州350002

【目的】明确番石榴果实采后环斑病发生的致病病原菌及其对番石榴果实采后品质的影响,筛选能抑制该病原菌的有效抑制剂。【方法】病原菌分离于发生环斑病的番石榴果皮病健交界处,并对该致病菌进行形态学鉴定、分子鉴定与系统发育树分析... 详细信息

【目的】明确番石榴果实采后环斑病发生的致病病原菌及其对番石榴果实采后品质的影响,筛选能抑制该病原菌的有效抑制剂。【方法】病原菌分离于发生环斑病的番石榴果皮病健交界处,并对该致病菌进行形态学鉴定、分子鉴定与系统发育树分析。另外,初步研究番石榴环斑病菌的生物学特性、环斑病菌侵染对果实采后品质的影响和评价不同抑制剂(ε-聚赖氨酸、水杨酸和褪黑素)对环斑病菌的体外抑菌效果。【结果】根据环斑病菌的菌丝与分生孢子的形态特征及基于rDNA-ITS、TUB和TEF-1α测序结果构建的系统发育树,将福建番石榴环斑病菌鉴定为棒状新拟盘多毛孢(Neopestalotiopsis clavispora)。葡萄糖和D-果糖、蛋白胨、7、25℃分别作为番石榴N. clavispora菌丝生长的最适碳源、氮源、pH、温度。此外,与未接种N. clavispora番石榴果实相比,接种N. clavispora果实具有较高的病斑直径和细胞膜透性,较低的果实硬度和色调角h值。体外试验表明,适当浓度的ε-聚赖氨酸、水杨酸和褪黑素处理对番石榴N. clavispora的菌丝生长有明显的抑制作用,可作为抑制N. clavispora侵染所致番石榴果实采后环斑病的抗菌剂。【结论】引起福建番石榴果实环斑病的病原菌为棒状新拟盘多毛孢(N. clavispora),且4.000 mg·mL^(-1)ε-聚赖氨酸对病原菌具有很好的抑制效果,可为后续番石榴环斑病的防治研究提供科学依据。

关键词：番石榴果实环斑病棒状新拟盘多毛孢生物学特性抑菌分析

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一类有限域的高效部分并行乘法器

计算机工程与应用 2009年第19期45卷 66-67,74页

作者：陈华锋浙江传媒学院杭州310018

提出了一类新的具有高度规则性的部分并行三项式有限域乘法器架构。通过对由不可约三项式生成的有限域GF(2m)上的乘法分析,推导出基本的运算形式。基于该运算形式,设计出新颖的乘法器架构。复杂度分析结果表明,该乘法器具有同当前最优... 详细信息

提出了一类新的具有高度规则性的部分并行三项式有限域乘法器架构。通过对由不可约三项式生成的有限域GF(2m)上的乘法分析,推导出基本的运算形式。基于该运算形式,设计出新颖的乘法器架构。复杂度分析结果表明,该乘法器具有同当前最优设计相同的复杂度。而且,可视具体的应用情境需求对乘法器电路进行灵活配置。

关键词：有限域不可约三项式部分并行乘法器

Enhanced mass transfer in three-dimensional single-atom nickel catalyst with open-pore structure for highly efficient CO_(2) electrolysis

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Journal of Energy Chemistry 2021年第11期30卷 43-50,I0002页

作者： Pengbo Zhai Xiaokang Gu Yi Wei Jinghan Zuo Qian chen Wei Liu Huaning Jiang Xingguo Wang Yongji Gong School of Materials Science and Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

Design of efficient catalysts for electrochemical reduction of carbon dioxide (CO_(2)) with high selectivity and activity is of great challenge, but significant for managing the global carbon balance. Herein, a series of three-dimensional (3D) single-atom metals anchored on graphene networks (3D SAM-G) with open-pore structure were successfully mass-produced via a facile in-situ calcination technique assisted by NaCl template. As-obtained 3D SANi-G electrode delivers excellent CO Faradaic efficiency (FE) of >96% in the potential range of −0.6 to −0.9 V versus reversible hydrogen electrode (RHE) and a high current density of 66.27 mA cm^(−2) at −1.0 V versus RHE, outperforming most of the previously reported catalysts tested in H-type cells. Simulations indicate that enhanced mass transport within the 3D open-pore structure effectively increases the catalytically active sites, which in turn leads to simultaneous enhancement on selectivity and activity of 3D SANi-G toward CO_(2) electroreduction. The cost-effective synthesis approach together with the microstructure design concept inspires new insights for the development of efficient electrocatalysts.

关键词： Open-pore structure Catalytic sites Reactant diffusion Single-atom catalysts CO_(2)electrolysis

Enhanced structural stability and durability in lithium-rich manganese-based oxide via surface double-coupling engineering

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Journal of Energy Chemistry 2024年第11期 274-283页

作者： Jiayu Zhao Yuefeng Su Jinyang Dong Xi Wang Yun Lu Ning Li Qing Huang Jianan Hao Yujia Wu Bin Zhang Qiongqiong Qi Feng Wu Lai chen School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and Engineering Beijing Institute of Technology Chongqing Innovation Center Beijing Institute of Technology Yibin Libode New Materials Co. Ltd. Initial Energy Science & Technology (Xiamen) Co. Ltd

Lithium-rich manganese-based oxides（LRMOs） exhibit high theoretical energy densities, making them a prominent class of cathode materials for lithium-ion batteries. However, the performance of these layered cathodes often declines because of capacity fading during cycling. This decline is primarily attributed to anisotropic lattice strain and oxygen release from cathode surfaces. Given notable structural transformations, complex redox reactions, and detrimental interface side reactions in LRMOs, the development of a single modification approach that addresses bulk and surface issues is challenging. Therefore,this study introduces a surface double-coupling engineering strategy that mitigates bulk strain and reduces surface side reactions. The internal spinel-like phase coating layer, featuring threedimensional（3D） lithium-ion diffusion channels, effectively blocks oxygen release from the cathode surface and mitigates lattice strain. In addition, the external Li3PO4coating layer, noted for its superior corrosion resistance, enhances the interfacial lithium transport and inhibits the dissolution of surface transition metals. Notably, the spinel phase, as excellent interlayer, securely anchors Li3PO4to the bulk lattice and suppresses oxygen release from lattices. Consequently, these modifications considerably boost structural stability and durability, achieving an impressive capacity retention of 83.4% and a minimal voltage decay of 1.49 m V per cycle after 150 cycles at 1 C. These findings provide crucial mechanistic insights into the role of surface modifications and guide the development of high-capacity cathodes with enhanced cyclability.

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