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Isolation and Identification of Pseudo Seven-Coordinate Ru(Ⅲ)Intermediate Completing the Catalytic Cycle of Ru-bda Type of Water Oxidation Catalysts

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CCS Chemistry 2022年第7期4卷 2481-2490页

作者： tianqi liu Ge Li Nannan Shen Linqin Wang Brian J.J.Timmer Shengyang Zhou Biaobiao Zhang Alexander Kravchenko Bo Xu Marten S.G.Ahlquist Licheng Sun Department of Chemistry School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10044 Department of Theoretical Chemistry and Biology School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10691 State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123 Center of Artificial Photosynthesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024 Nanotechnology and Functional Materials Department of Materials Sciences and EngineeringThe Angstrom LaboratoryUppsala UniversityUppsala 75103 Institute of Artificial Photosynthesis(IAP) State Key Laboratory of Fine ChemicalsDalian University of Technology(DUT)Dalian 116024

Isolation of RuⅢ-bda(17-electron specie)complex with an aqua ligand(2-electron donor)is challenging due to violation of the 18-electron *** considerable efforts have been dedicated to mechanistic studies of water oxidation by the Ru-bda family,the structure and initial formation of the Ru^(Ⅲ)-bda aqua complex are still ***,we challenge this often overlooked step by designing a pocketshape Ru-based complex *** computational studies showed that 1 possesses the crucial hydrophobicity at the Ru^(V)(O)state as well as similar probability of access of terminal O to solvent water molecules when compared with classic Ru-bda *** characterization of single-crystal structures at the Ru^(Ⅱ) and Ru^(Ⅲ) states,a pseudo seven-coordinate“ready-togo”aqua ligand with Ru^(Ⅲ)…O distance of 3.62A was *** aqua ligand was also found to be part of a formed hydrogen-bonding network,providing a good indication of how the Ru^(Ⅲ)-OH_(2)complex is formed.

关键词： Ru-bda water oxidation pseudo seven-coordinate Ru^(Ⅲ)-OH_(2)intermediate water preorganization

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考虑多等级加固的气电联合配网系统韧性鲁棒提升策略研究

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电网技术 2022年第12期46卷 4938-4946页

作者：卿玉良刘天琪刘绚何川南璐四川大学电气工程学院四川省成都市610065 湖南大学电气与信息工程学院湖南省长沙市410082

自然灾害是一种发生概率低但破坏力强的极端事件,发生时会给气电联合配网系统中造成严重影响。为提高气电联合配网系统在自然灾害下的韧性,考虑线路/管道加固、应急资源配置与气电联合需求响应,该文提出基于鲁棒优化的韧性提升策略。首... 详细信息

自然灾害是一种发生概率低但破坏力强的极端事件,发生时会给气电联合配网系统中造成严重影响。为提高气电联合配网系统在自然灾害下的韧性,考虑线路/管道加固、应急资源配置与气电联合需求响应,该文提出基于鲁棒优化的韧性提升策略。首先,在气电联合配网系统中考虑到线路/管道加固后在面对严重自然灾害时可能失效的情形,提出一种表示不同灾害程度与加固程度的多等级加固模型,并建立相应的线路/管道状态约束。然后,在气电联合配网系统运行约束基础上,建立气电应急资源的优化配置模型,引入气电联合需求响应机制,提出以气电联合配网系统中加权失负荷最小为目标的三层防御-攻击-防御韧性提升模型,并采用列与约束生成算法求解。最后,在算例中证明了模型的可行性和求解方法的有效性。

关键词：气电联合配网系统自然灾害韧性鲁棒优化多等级加固需求响应

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铁氟龙AFT250航空电线燃烧毒害气体产物生成特性

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材料导报 2022年第1期36卷 197-201页

作者：刘天奇王宁蔡之馨沈阳航空航天大学安全工程学院沈阳110136

采用烟毒性测试箱研究了铁氟龙AFT250航空电线燃烧后生成的毒害气体HF、CO、CO_(2)浓度的变化特性。结果表明:在点火温度为1150℃、点火持续时间10 s条件下,铁氟龙AFT250电线燃烧生成HF有毒气体质量浓度为8 mg/m^(3),生成CO和CO_(2)气... 详细信息

采用烟毒性测试箱研究了铁氟龙AFT250航空电线燃烧后生成的毒害气体HF、CO、CO_(2)浓度的变化特性。结果表明:在点火温度为1150℃、点火持续时间10 s条件下,铁氟龙AFT250电线燃烧生成HF有毒气体质量浓度为8 mg/m^(3),生成CO和CO_(2)气体体积浓度分别为0.0015%和0.12%,说明在该条件下已生成一定量的毒害气体,但毒害气体浓度并不大。随截取电线长度在10~100 cm内增加,生成有毒有害气体HF、CO、CO_(2)的浓度均不断增大。当电线长度为100 cm时,HF质量浓度增至18 mg/m^(3),CO体积浓度增至0.004%,CO_(2)体积浓度增至0.425%,这主要由于增加电线长度会增加绝缘层材料聚四氟乙烯中F、C元素含量,导致更多的F、C原子和环境中的H、O原子结合。随点火持续时间在10~50 s内延长,燃烧生成的毒害气体HF、CO、CO_(2)浓度均显著增大,HF气体质量浓度增幅为7 mg/m^(3),CO和CO_(2)体积浓度增幅分别为0.0015%和0.07%,这主要是由于点火持续时间越长,会导致更多的C-C和C-F化学键断裂,从而增大生成的HF、CO和CO_(2)浓度,极大地增加人体中毒与窒息的风险。

关键词：铁氟龙有毒有害气体燃烧产物点火持续时间

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Single-base editing in IGF2 improves meat production and intramuscular fat deposition in Liang Guang Small Spotted pigs

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Journal of Animal Science and Biotechnology 2024年第1期15卷 108-126页

作者： tianqi Duo Xiaohong liu Delin Mo Yu Bian Shufang Cai Min Wang Ruiqiang Li Qi Zhu Xian Tong Ziyun Liang Weilun Jiang Shiyi Chen Yaosheng Chen Zuyong He State Key Laboratory of Biocontrol School of Life SciencesSun Yat-Sen UniversityGuangzhou 510275GuangdongChina Department of Pharmacology(the State‑Province Key Laboratories of Biomedicine‑Pharmaceutics of China Key Laboratory of Cardiovascular ResearchMinistry of Education)College of PharmacyHarbin Medical UniversityHarbin 150081China Hunan Provincial Key Laboratory for Genetic Improvement of Domestic Animal College of Animal Science and TechnologyHunan Agricultural UniversityChangsha 410128China

Background Chinese indigenous pigs are popular with consumers for their juiciness,flavour and meat quality,but they have lower meat ***-like growth factor 2(IGF2) is a maternally imprinted growth factor that promotes skeletal muscle growth by regulating cell proliferation and differentiation.A single nucleotide polymorphism(SNP) within intron 3 of porcine IGF2 disrupts a binding site for the repressor,zinc finger BED-type containing 6(ZBED6),leading to up-regulation of IGF2 and causing major effects on muscle growth,heart size,and backfat *** favorable mutation is common in Western commercial pig populations,but absent in most Chinese indigenous pig *** improve meat production of Chinese indigenous pigs,we used cytosine base editor 3(CBE3)to introduce IGF2 intron3-C3071T mutation into porcine embryonic fibroblasts(PEFs) isolated from a male Liang Guang Small Spotted pig(LGSS),and single-cell clones harboring the desired mutation were selected for somatic cell nuclear transfer(SCNT) to generate the founder line of IGF2^(T/T) *** We found the heterozygous progeny IGF2^(C/T) pigs exhibited enhanced expression of IGF2,increased lean meat by 18%-36%,enlarged loin muscle area by 3%-17%,improved intramuscular fat(IMF) content by 18%-39%,marbling score by 0.75-1,meat color score by 0.53-1.25,and reduced backfat thickness by 5%-16%.The enhanced accumulation of intramuscular fat in IGF2^(C/T) pigs was identified to be regulated by the PI3K-AKT/AMPK pathway,which activated SREBP1 to promote *** We demonstrated the introduction of IGF2-intron3-C3071T in Chinese LGSS can improve both meat production and quality,and first identified the regulation of IMF deposition by IGF2 through SREBP1 via the PI3KAKT/AMPK signaling *** study provides a further understanding of the biological functions of IGF2and an example for improving porcine economic traits through precise base editing.

关键词： CBE3 IGF2 Intramuscular fat Meat production PI3K-AKT/AMPK ZBED6

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考虑极端灾害下系统韧性约束的气电联合配网分布鲁棒扩展规划

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工程科学与技术 2023年第1期55卷 80-92页

作者：王沿胜何川刘绚南璐刘天琪四川大学电气工程学院四川成都610065 湖南大学电气与信息工程学院湖南长沙410082

近年来,在未来多能互补、综合能源系统的背景下,气电联合配网得到迅速的发展。然而,当前全球各地极端灾害频发,给能源系统的安全性带来了严峻的挑战。针对极端灾害对系统造成的失负荷影响,为兼顾系统的经济性与安全性,提出了一种考虑极... 详细信息

近年来,在未来多能互补、综合能源系统的背景下,气电联合配网得到迅速的发展。然而,当前全球各地极端灾害频发,给能源系统的安全性带来了严峻的挑战。针对极端灾害对系统造成的失负荷影响,为兼顾系统的经济性与安全性,提出了一种考虑极端灾害下系统韧性约束的气电联合配网分布鲁棒扩展规划模型。首先,以规划成本与运行成本最小化为目标,建立考虑电动汽车充电站、分布式燃气机组和储能设备的气电联合配网扩展规划模型;然后,考虑极端灾害的作用,建立考虑韧性约束的气电联合配网分布鲁棒扩展规划模型,该模型包括基础场景与极端灾害最坏场景,其中基础场景考虑系统的经济性,以规划成本与基础场景运行成本最小为目标,极端灾害最坏场景则通过韧性约束保证系统的安全性,所提模型通过主问题–子问题迭代求解。最后,算例仿真发现:通过增加电动汽车充电站、分布式燃气机组和储能设备的规划投建,系统的经济性得到明显提升;而在面对极端灾害的影响下,通过分布式燃气机组的发电和电动汽车、储能设备的放电,系统失负荷情况得到减少,但随着系统韧性的增大所需单位规划成本会大幅增加。本文为在规划层面提升系统韧性提供了一种有效与实用的方法,为未来减小极端灾害对系统造成的影响的方案提供了一定参考。

关键词：电动汽车充电站分布式燃气机组储能设备极端灾害韧性分布鲁棒优化

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Ultra-homogeneous dense Ag nano layer enables long lifespan solid-state lithium metal batteries

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Journal of Energy Chemistry 2024年第9期96卷 110-119页

作者： Yaning liu tianqi Yang Ruyi Fang Chengwei Lu Ruojian Ma Ke Yue Zhen Xiao Xiaozheng Zhou Wenkui Zhang Xinping He Yongping Gan Jun Zhang Xinhui Xia Hui Huang Xinyong Tao Yang Xia College of Materials Sciencend Engineering Zhejiang University of TechnologyHangzhou 310014ZhejiangChina Key Laboratory of Rare Earth Optoelectronic Materialsnd Devices of Zhejiang Province Institute of Optoelectronic Materialsnd DevicesChina Jiliang UniversityHangzhou 310018ZhejiangChina

The unstable electrolyte/lithium(Li)anode interface has been one of the key challenges in realizing high energy density solid-state lithium metal batteries(LMBs)***,a dense and uniform silver(Ag)nano interlayer with a thickness of∼35 nm is designed accurately by magnetron sputtering technology to optimize the electrolyte/Li anode *** Ag nano layer reacts with Li metal anode to in-situ form Li-Ag alloy,thus enhancing the physical interfacial contact,and further improving the interfacial wettability and *** particular,the Li-Ag alloy is inclined to form AgLi phase proved by cryo-TEM and DFT,effectively preventing SN from continuously“attacking”the Li metal anode due to the lower adsorption of succinonitrile(SN)molecules on AgLi than that of pure Li metal,thereby significantly reinforcing the interfacial ***,the enhanced physical and chemical stability of electrolyte/Li anode interface promotes the homogeneous deposition of Li^(+)and inhibits the dendrite *** Li-symmetric cell maintains stable operation for up to 1700 h and the cycling stability of LiFePO_(4)|SPE|Li full cell is remarkably improved at room temperature(capacity retention rate of 91.9%for 200 cycles).This work opens an effective way for accurate and controllable interface design of long lifespan solid-state LMBs.

关键词： Silvernano layer Poly(ethylene oxide) Solid polymer electrolyte Succinonitrile Lithium metal battery

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The resistance switching performance of the memristor improved effectively by inserting carbon quantum dots(CQDs)for digital information processing

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Nano Research 2024年第9期17卷 8438-8446页

作者： tianqi Yu Jie Li Wei Lei Suhaidi Shafe Mohd Nazim Mohtar Nattha Jindapetch Paphavee van Dommelen Zhiwei Zhao Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China Institute of Nanoscience and Nanotechnology University Putra MalaysiaSerdangSelangor 43400Malaysia Department of Electrical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90112Thailand Division of Physical Science Faculty of SciencePrince of Songkla UniversityHat Yai Campus 15 KarnjanavanichHat YaiSongkhla 90110Thailand

As an emerging information device that adapts to development of the big data era,memristor has attracted much attention due to its advantage in processing massive ***,the nucleation and growth of conductive filaments often exhibit randomness and instability,which undoubtedly leads to a wide and discrete range of switching parameters,damaging the electrical performance of *** this work,a strategy of inserting carbon quantum dots(CQDs)into graphene oxide(GO)resistance layer is utilized to improve the stability of the switching parameters and the reliability of the device is *** with GO-based devices,GO/CQDs/GO-based devices exhibit a more stable resistance switching curve,low power,lower and more concentrated threshold voltage parameters with lower variation coefficient,faster switching speed,and more stable retention and *** cause-inducing performance improvement may be attributed to the local electric field generated by CQDs in resistance switching that effectively guides the formation and rupture of conductive filaments,which optimizes the effective migration distance of Ag^(+),thereby improving the uniformity of resistance ***,a convolutional neural network model is constructed to identify the CIFAR-10 data set,showing the high recognition accuracy of online and offline *** cross-kernel structure is used to further implement convolutional image processing through multiplication and accumulation *** work provides a solution to improve the performance of memristors,which can contribute to developing digital information processing.

关键词： carbon quantum dots memristor uniformity convolutional neural network convolutional image processing

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Post-acute ischemic stroke hyperglycemia aggravates destruction of the blood-brain barrier

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Neural Regeneration Research 2024年第6期19卷 1344-1350页

作者： tianqi Xu Jianhong Yang Yao Xu Xiaofeng Wang Xiang Gao Jie Sun Chenhui Zhou Yi Huang Department of Neurology The First Affiliated Hospital of Ningbo University Department of General Surgery The First Affiliated Hospital of Ningbo University Department of Neurosurgery The First Affiliated Hospital of Ningbo University Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province

Post-acute ischemic stroke hyperglycemia increases the risk of hemorrhagic transformation, which is associated with blood-brain barrier disruption. Brain microvascular endothelial cells are a major component of the blood-brain barrier. Intercellular mitochondrial transfer has emerged as a novel paradigm for repairing cells with mitochondrial dysfunction. In this study, we first investigated whether mitochondrial transfer exists between brain microvascular endothelial cells, and then investigated the effects of post-acute ischemic stroke hyperglycemia on mitochondrial transfer between brain microvascular endothelial cells. We found that healthy brain microvascular endothelial cells can transfer intact mitochondria to oxygen glucose deprivation-injured brain microvascular endothelial cells. However, post-oxygen glucose deprivation hyperglycemia hindered mitochondrial transfer and exacerbated mitochondrial dysfunction. We established an in vitro brain microvascular endothelial cell model of the blood-brain barrier. We found that post-acute ischemic stroke hyperglycemia reduced the overall energy metabolism levels of brain microvascular endothelial cells and increased permeability of the blood-brain barrier. In a clinical study, we retrospectively analyzed the relationship between post-acute ischemic stroke hyperglycemia and the severity of hemorrhagic transformation. We found that post-acute ischemic stroke hyperglycemia serves as an independent predictor of severe hemorrhagic transformation. These findings suggest that post-acute ischemic stroke hyperglycemia can aggravate disruption of the blood-brain barrier by inhibiting mitochondrial transfer.

关键词： acute ischemic stroke blood-brain barrier brain microvascular endothelial cells mitochondrial transfer stress hyperglycemia

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大数据应用于德育评价的伦理风险:表征形态与防范策略

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当代教育科学 2022年第8期 55-62页

作者：邹太龙刘天琪湖北民族大学教师教育学院湖北民族大学马克思主义学院广州大学教育学博士后流动站

技术的在场和赋能是现代教育评价的题中应有之义,但技术的盲目使用和过度介入会诱发多重伦理风险。大数据技术在增强德育评价科学性、专业性和客观性的同时,也会滋生伦理风险:过往数据干扰教师整体判断力,数据依赖消磨教师主观能动性;... 详细信息

技术的在场和赋能是现代教育评价的题中应有之义,但技术的盲目使用和过度介入会诱发多重伦理风险。大数据技术在增强德育评价科学性、专业性和客观性的同时,也会滋生伦理风险:过往数据干扰教师整体判断力,数据依赖消磨教师主观能动性;数据挖掘侵犯学生隐私权利,精准预测亵渎学生自由意志;工具价值僭越评价本体价值,多源异构混杂评价正面导向。造成上述伦理风险的主要诱因包括:大数据固有特征和强大功能的负效应;德育评价数据承载着更高的伦理属性;评价主体的评价素养和数据素养不高;外部管理规范和道德原则相对滞后。为此,学校急需构建德育数据使用的伦理原则,合理把握德育数据的应用限度,提高德育评价主体的数据素养,完善德育数据安全的保障体系。

关键词：大数据德育评价伦理风险德育数据伦理原则

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知识图谱技术及其在农业领域应用研究进展

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农业工程学报 2023年第16期39卷 1-12页

作者：穆维松刘天琪苗子溦冯建英中国农业大学信息与电气工程学院北京100083

随着农业大数据时代的到来,如何开展直观的有效信息挖掘成为数据利用的一大难题。作为一种能够帮助人们高效地管理现实世界中事物及其关系的异构语义网络,知识图谱应用在近年来备受关注。在农业数据不断增加、结构越来越复杂的背景下,... 详细信息

随着农业大数据时代的到来,如何开展直观的有效信息挖掘成为数据利用的一大难题。作为一种能够帮助人们高效地管理现实世界中事物及其关系的异构语义网络,知识图谱应用在近年来备受关注。在农业数据不断增加、结构越来越复杂的背景下,将知识图谱应用于农业领域有助于农业大数据分析,促进智慧农业发展。该文首先分析了知识图谱构建的模式,即自顶向下、自底向上及两种模式结合等3种模式的特点,然后从本体构建、知识抽取、知识融合、知识推理、知识图谱存储及可视化5个方面综述了农业知识图谱构建的关键技术应用进展与难点,接着对当前知识图谱在农业领域的应用进行了梳理,主要有农业专题文献计量研究、农业信息检索、农业知识问答和农业信息资源推荐等4个方面,最后对知识图谱技术在农业领域的应用研究方向进行了展望,认为未来应关注基于知识图谱的农产品电商推荐、动态农业知识图谱的构建、跨领域知识图谱的构建与关联等方面。

关键词：农业大数据应用知识图谱知识图谱构建农业领域

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