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Rationally designed hollow carbon nanospheres decorated with S,P co-doped NiSe_(2) nanoparticles for high-performance potassium-ion and lithium-ion batteries

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Journal of Energy Chemistry 2023年第3期78卷 401-411,I0011页

作者： Jiajia Ye Zizhong Chen Zhiqiang Zheng Zhanghua Fu guanghao gong Guang Xia Cheng Hu Shenzhen Research Institute of Shandong University Shenzhen 518057GuangdongChina Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialShandong UniversityJinan 250100ShandongChina i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123JiangsuChina

Hollow nanostructures with external shells and inner voids have been proved to greatly shorten the transport distance of ions/electrons and buffer volume change,especially for the large-sized potassium-ions in secondary batteries.In this work,hollow carbon(HC) nanospheres embedded with S,P co-doped NiSe_(2)nanoparticles are fabricated by "drop and dry" and "dissolving and precipitation" processes to form Ni(OH)2nanocrystals followed by annealing with S and P dopants to form nanoparticles.The resultant S,P-NiSe_(2)/HC composite exhibits excellent cyclic performance with 131.6 mA h g^(-1)at1000 mA g^(-1)after 3000 cycles for K^(+)storage and a capacity of 417.1 mA h g^(-1)at 1000 mA g^(-1)after1000 cycles for Li^(+)storage.K-ion full cells are assembled and deliver superior cycling stability with a ca pacity of 72.5 mA h g^(-1)at 200 mA g^(-1)after 500 cycles.The hollow carbon shell with excellent electrical conductivity effectively promotes the transporta tion and tolerates large volume variation for both K^(+)and Li^(+).Density functional theory calculations confirm that the S and P co-doping NiSe_(2) enables stronger adsorption of K^(+)ions and higher electrical conductivity that contributes to the improved electrochemical performance.

关键词： S,P co-doping NiSe_(2)nanoparticles Hollow carbon nanospheres Potassium-ion batteries Lithium-ion batteries

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P-doped CoSe_(2)nanoparticles embedded in 3D honeycomb-like carbon network for long cycle-life Na-ion batteries

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Journal of Materials Science & Technology 2021年第18期77卷 100-107页

作者： Jiajia Ye Xuting Li Guang Xia guanghao gong Zhiqiang Zheng Chuanzhong Chen Cheng Hu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJi'nan250061China Shandong Engineering&Technology Research Center for Superhard Materials Shandong UniversityJi'nan250061China Shenzhen Research Institute of Shandong University Shenzhen518057China

We report for the first time a Na-ion battery anode material composed of P-doped CoSe_(2)nanoparticles(P-CoSe_(2))with the size of 5–20 nm that are uniformly embed in a 3 D porous honeycomb-like carbon network.High rate capability and cycling stability are achieved simultaneously.The honeycomb-like carbon network is rationally designed to support high electrical conductivity,rapid Na-ion diffusion as well as the accommodation of the volume expansion from the active P-CoSe_(2)nanoparticles.In particular,heteroatom P-doping within CoSe_(2)introduces stronger P-Co bonds and additional P-Se bonds that significantly improve the structure stability of P-CoSe_(2)for highly stable sodiation/desodiation over long-term cycling.P-doping also improves the electrical conductivity of the CoSe_(2)nanoparticles,leading to highly elevated electrochemical kinetics to deliver high specific capacities at high current densities.Benefiting from the unique nanostructure and atomic-level P-doping,the P-CoSe_(2)(2:1)/C anode delivers an excellent cycle stability with a specific capacity of 206.9 mA h g^(-1)achieved at 2000 mA g^(-1)after 1000 cycles.In addition,this material can be synthesized using a facile pyrolysis and selenization/phosphorization approach.This study provides new opportunities of heteroatom doping as an effective method to improve the cycling stability of Na-ion anode materials.

关键词： CoSe_(2) P-doping Honeycomb-like carbons Anodes Sodium-ion batteries

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Multi-omics Analysis of Primary Cell Culture Models Reveals Genetic and Epigenetic Basis of Intratumoral Phenotypic Diversity

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Genomics, Proteomics & Bioinformatics 2019年第6期17卷 576-589页

作者： Sixue Liu Zuyu Yang guanghao Li Chunyan Li Yanting Luo Qiang gong Xin Wu Tao Li Zhiqian Zhang Baocai Xing Xiaolan Xu Xuemei Lu CAS Key Laboratory of Genomics and Precision Medicine Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Invasive Pathogens Laboratory Institute of Environmental Science and ResearchPorirua 5022WellingtonNew Zealand Department of Cell Biology Key Laboratory of Carcinogenesis and Translational ResearchCenter for Molecular and Translational MedicinePeking University Cancer Hospital and InstituteBeijing 100142China Department of Hepatobiliary Surgery I Peking University Cancer Hospital and InstituteBeijing 100142China National Key Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China

Uncovering the functionally essential variations related to tumorigenesis and tumor progression from cancer genomics data is still challenging due to the genetic diversity among patients,and extensive inter-and intra-tumoral heterogeneity at different levels of gene expression regulation,including but not limited to the genomic, epigenomic, and transcriptional levels. To minimize the impact of germline genetic heterogeneities, in this study, we establish multiple primary cultures from the primary and recurrent tumors of a single patient with hepatocellular carcinoma(HCC). Multiomics sequencing was performed for these cultures that encompass the diversity of tumor cells from the same patient. Variations in the genome sequence, epigenetic modification, and gene expression are used to infer the phylogenetic relationships of these cell cultures. We find the discrepancy among the relationships revealed by single nucleotide variations(SNVs) and transcriptional/epigenomic profiles from the cell cultures. We fail to find overlap between sample-specific mutated genes and differentially expressed genes(DEGs), suggesting that most of the heterogeneous SNVs among tumor stages or lineages of the patient are functionally insignificant. Moreover, copy number alterations(CNAs) and DNA methylation variation within gene bodies, rather than promoters, are significantly correlated with gene expression variability among these cell cultures. Pathway analysis of CNA/DNA methylation-related genes indicates that a single cell clone from the recurrent tumor exhibits distinct cellular characteristics and tumorigenicity, and such an observation is further confirmed by cellular experiments both in vitro and in vivo. Our systematic analysis reveals that CNAs and epigenomic changes, rather than SNVs, are more likely to contribute to the phenotypic diversity among subpopulations in the tumor. These findings suggest that new therapeutic strategies targeting gene dosage and epigenetic modification should be considered in personalized cancer medic

关键词： Intra-individual tumor heterogeneity Parallel primary culture Multi-omics Functional phenotypic diversity

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快速回火对690 MPa级别工程机械用钢板组织和性能的影响

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金属热处理 2023年第9期48卷 75-81页

作者：李德明雷宁宁张晋刚宫涛周广浩山推工程机械股份有限公司山东济宁272073

利用OM、TEM和力学性能检测等方法研究了离线淬火后20、30、40℃/s三种不同回火加热速度及回火时间对690 MPa级工程机械用钢板内部析出物、组织以及性能的影响。结果表明,回火加热速度对钢板抗拉强度的影响较小,而屈服强度随保温时间的... 详细信息

利用OM、TEM和力学性能检测等方法研究了离线淬火后20、30、40℃/s三种不同回火加热速度及回火时间对690 MPa级工程机械用钢板内部析出物、组织以及性能的影响。结果表明,回火加热速度对钢板抗拉强度的影响较小,而屈服强度随保温时间的增加变化显著。钢板内部组织多为回火贝氏体+铁素体组织,保温时间延长,铁素体增多,保温15 min的试样性能稳定。通过对保温15 min的试样内部析出物的分析发现,随着回火加热速度增加,钢板内部碳化物的聚集现象先减小后增加,回火加热速度为30℃/s的试样综合力学性能最佳。

关键词：工程机械淬火快速回火贝氏体析出

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Optical forces of focused femtosecond laserpulses on nonlinear optical Rayleigh particles

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Photonics Research 2018年第2期6卷 138-143页

作者： LIPING gong BING GU guanghao RUI YIPING CUI ZHUQING ZHU QIWEN ZHAN Advanced Photonics Center Southeast University Nanjing 210096 Jiangsu China Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and Technology Nanjing Normal University Nanjing 210023 Jiangsu China Department of Electro-Optics and Photonics University of Dayton 300 College Park Dayton Ohio 45469-2951 USA

The principle of optical trapping is conventionally based on the interaction of optical fields with linear-induced polarizations. However, the optical force originating from the nonlinear polarization becomes significant when nonlinear optical nanoparticles are trapped by femtosecond laser pulses. Herein we develop the time-averaged optical forces on a nonlinear optical nanoparticle using high-repetition-rate femtosecond laser pulses, based on the linear and nonlinear polarization effects. We investigate the dependence of the optical forces on the magnitudes and signs of the refractive nonlinearities. It is found that the self-focusing effect enhances the trapping ability, whereas the self-defocusing effect leads to the splitting of the potential well at the focal plane and destabilizes the optical trap. Our results show good agreement with the reported experimental observations and provide theoretical support for capturing nonlinear optical particles.

关键词：非线性偏振效应激光脉冲通讯技术发展现状

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基于局部语义拓扑图的视觉SLAM闭环检测

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机器人 2019年第5期41卷 649-659页

作者：张括嘉张云洲吕光浩龚益群东北大学机器人科学与工程学院辽宁沈阳110016 东北大学信息科学与工程学院辽宁沈阳110819

针对视觉SLAM(同步定位与地图创建)中现有的闭环检测方法容易产生假阳性检测的问题,利用YOLOv3目标检测算法获取场景中的语义信息,以DBSCAN(density-based spatial clustering of application with noise)算法修正错误检测和遗漏检测,... 详细信息

针对视觉SLAM(同步定位与地图创建)中现有的闭环检测方法容易产生假阳性检测的问题,利用YOLOv3目标检测算法获取场景中的语义信息,以DBSCAN(density-based spatial clustering of application with noise)算法修正错误检测和遗漏检测,构建语义节点,对关键帧形成局部语义拓扑图.利用图像特征和目标类别信息进行语义节点匹配,计算不同语义拓扑图中对应边的变换关系,得到关键帧之间的相似度,并根据连续关键帧的相似度变化情况进行闭环的判断.在公开数据集上的实验表明,目标聚类有效地提高了室内场景下的闭环检测准确性.与单纯利用传统视觉特征的算法相比,本文算法能够获得更加准确的闭环检测结果.

关键词：移动机器人视觉SLAM 闭环检测语义信息局部语义拓扑图

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指数变增益迭代学习控制最优增益研究

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电光与控制 2023年第5期30卷 52-57页

作者：李广豪龚俊戴宝林兰州理工大学兰州730000

针对指数变增益迭代学习控制(ILC)算法难以进一步改进且缺乏优化理论等问题,提出一种指数变增益迭代学习控制(ILC)算法在线性时不变(LTI)系统中的控制增益优化方法。首先,由托普利茨矩阵特性和矩阵迭代理论得到单输入单输出(SISO)离散LT... 详细信息

针对指数变增益迭代学习控制(ILC)算法难以进一步改进且缺乏优化理论等问题,提出一种指数变增益迭代学习控制(ILC)算法在线性时不变(LTI)系统中的控制增益优化方法。首先,由托普利茨矩阵特性和矩阵迭代理论得到单输入单输出(SISO)离散LTI系统中的收敛充要条件,并证明算法的收敛性;其次,由最优化理论得到算法单调收敛条件,最终得到最优控制增益的精确解,并得出指数增益与最优控制增益之间的关系。该方法根据系统状态方程得到最优控制策略,可计算得到精确最优控制值,进一步提高系统收敛速度。仿真结果表明,该方法能有效提高算法学习速度,具有良好的控制性能。

关键词：迭代学习控制指数变增益单调收敛最优控制增益收敛速度

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湖南大新金矿床构造控矿特征及矿床成因

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大地构造与成矿学 2007年第3期31卷 342-347页

作者：龚贵伦陈广浩戴建斌陈西李武毅中国科学院广州地球化学研究所广东广州510640 武警黄金第十一支队湖南宁乡410600

湖南大新金矿床位于湘中白马山-龙山东西向成矿带中部的大乘山穹隆北东端。受区域基底断裂的分割与挟持,及其下伏岩浆活动的上侵作用,穹隆核部震旦系江口组地层发生脆性断裂,从而为成矿提供了导矿和容矿构造,矿区矿脉严格受NE、NW、近S... 详细信息

湖南大新金矿床位于湘中白马山-龙山东西向成矿带中部的大乘山穹隆北东端。受区域基底断裂的分割与挟持,及其下伏岩浆活动的上侵作用,穹隆核部震旦系江口组地层发生脆性断裂,从而为成矿提供了导矿和容矿构造,矿区矿脉严格受NE、NW、近SN向三组断裂控制。矿床为破碎蚀变岩夹石英脉型金矿床,含矿热液沿断裂破碎带充填交代而成矿。

关键词：金矿床构造控矿矿床成因湖南大新

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综合找矿方法在河台金矿找矿预测中的应用

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大地构造与成矿学 2012年第2期36卷 240-247页

作者：朱江建陈广浩曾乔松龚贵伦易金龚朝阳黄栋林林舸中国科学院广州地球化学研究所矿物学与成矿学重点实验室广东广州510640 中国科学院研究生院北京100049 中国科学院南海海洋研究所边缘海地质重点实验室广东广州510301 中国人民武装警察部队黄金第十一支队湖南宁乡410600 广东高要河台金矿广东肇庆526127

河台金矿是一个典型的与韧性剪切带有关的金矿床,也是目前粤西、桂东南已发现的最大的金矿床。为了给深边部的找矿提供科学依据,本文应用伽马能谱、地电化学及数值模拟产生的体积应变异常带对本区进行了找矿预测实验研究。伽马能谱K异... 详细信息

河台金矿是一个典型的与韧性剪切带有关的金矿床,也是目前粤西、桂东南已发现的最大的金矿床。为了给深边部的找矿提供科学依据,本文应用伽马能谱、地电化学及数值模拟产生的体积应变异常带对本区进行了找矿预测实验研究。伽马能谱K异常带指示了本区糜棱岩化及热液蚀变过程中引起的钾化蚀变作用,金矿体与糜棱岩化带主要分布在K异常带中;地电化学异常带可能代表了本区不同深度矿体在地表的垂直投影;体积应变异常带及其附近有利于发展为本区的含矿糜棱岩化带。在同一构造成矿体系中,根据相似类比原则,表明以上三种方法在本区进行找矿预测可行。综合以上三种方法,圈定了3个可能的含矿带,建议对其进行验证。

关键词：河台金矿数值模拟伽马能谱地电化学体积应变找矿预测

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Femtosecond laser trapping dynamics of two-photon absorbing hollow-core nanoparticles

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Chinese Optics Letters 2020年第8期18卷 59-64页

作者：贡丽萍张笑河朱竹青芮光浩何军崔一平顾兵 Advanced Photonics Center Southeast UniversityNanjing 210096China Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and TechnologyNanjing Normal UniversityNanjing 210023China School of Physics and Electronics Central South UniversityChangsha 410012China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

We investigate femtosecond laser trapping dynamics of two-photon absorbing hollow-core nanoparticles with different volume fractions and two-photon absorption(TPA)coefficients.Numerical simulations show that the hollow-core particles with low and high-volume fractions can easily be trapped and bounced by the tightly focused Gaussian laser pulses,respectively.Further studies show that the hollow-core particles with and without TPA can be identified,because the TPA effect enhances the radiation force,and subsequently the longitudinal force destabilizes the trap by pushing the particle away from the focal point.The results may find direct applications in particle sorting and characterizing the TPA coefficient of single nanoparticles.

关键词： laser trapping multiphoton processes ultrafast nonlinear optics

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