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脑磁源定位重建算法研究进展

中国生物医学工程学报 2024年第4期43卷 489-498页

作者：羊艳玲姚旭峰罗世昌时承高秀敏吴韬上海理工大学健康科学与工程学院上海200093 上海健康医学院医学影像学院上海201318 上海理工大学光电信息与计算机工程学院上海200093

脑磁图作为一种非侵入性大脑功能神经成像方法,以其高时间分辨率和无创性等特点得到临床的广泛关注。脑磁源定位研究的核心问题是利用脑外磁场数据(脑磁图)来推断脑内电流源的分布,并进一步确定神经源的位置和活动模式,这一逆问题的求... 详细信息

脑磁图作为一种非侵入性大脑功能神经成像方法,以其高时间分辨率和无创性等特点得到临床的广泛关注。脑磁源定位研究的核心问题是利用脑外磁场数据(脑磁图)来推断脑内电流源的分布,并进一步确定神经源的位置和活动模式,这一逆问题的求解过程存在不唯一性和不适定性的难题。脑磁源定位重建方法分为分布源模型和偶极子定位。综述脑磁图和磁源成像的发展过程和研究进展,分布源模型包括最小范数估计法、低分辨率脑电磁断层扫描、欠定系统局域解法、贝叶斯推断估计法、波束成形器和稀疏源成像等;偶极子定位包括最大熵方法、最小二乘范数、多信号分类算法、神经网络和遗传算法等;论述各类算法的特色、局限性及其存在的问题;随着技术的不断进步,融合多种脑功能技术的多模态重建方法有望成为神经功能诊断领域的主导性检测技术。

关键词：脑磁图磁源定位重建逆问题分布源模型偶极子定位

Monolithic polyimine vitrimer/graphene aerogel composites

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Chinese Chemical Letters 2023年第2期34卷 529-533页

作者： Jinye Zhang shichang luo Yunlong Ma Ruiyang Li Yinghua Jin Li Qiu Wei Zhang Yunnan Key Laboratory for Micro/Nano Materials&Technology National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China Department of Chemistry University of Colorado BoulderBoulderCO 80309United States

Graphene-polymer composites have attracted great attention as sensing materials due to their tailorable electrical conductivity, physicochemical properties, and sensitivity to geometric and functional ***, we report the first example of cylindrical monolithic polyimine vitrimer/graphene composites with excellent mechanical, compressive, rehealable and recyclable, and piezoresistive properties via simple infiltration of polymer monomers into the pores of graphene aerogel followed by thermal curing. The composites exhibit excellent durable compressibility(negligible reduction in the compression properties even after 3000 consecutive compression cycles), rapid recovery to the original size upon stress released,high compressive strength(up to 1.2 MPa), and high conductivity(up to 79 S/m). Excellent piezoresistive properties were observed, displaying consistent and reliable change of the electrical resistance with the compression ratio. Furthermore, rehealing with ~100% recovery of the compressive strength and electric conductivity was achieved under mild rehealing conditions, which is highly desired but has rarely been reported for electronic materials. The facile strategy for fabrication of rehealable monolithic polymer/GAs can open new possibilities for the sustainable development of composites with high electrical conductivity for various applications such as sensing, health monitoring, and movement detection.

关键词： Vitrimer Graphene aerogel Polyimine Rehealable Piezoresistive Monolithic

Highly Conductive Poly(Imide–Imine)Hybrid Vitrimer-Graphene Aerogel Composites

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Chinese Journal of Chemistry 2023年第17期41卷 2125-2131页

作者： Yunlong Ma Ruiyang Li shichang luo Xiran Shen Rao Tao Yinghua Jin Wei Zhang Li Qiu Yunnan Key Laboratory for Micro/Nano Materials&Technology National Centerfor International Research on Photoelectric and Energy MaterialsSchoolof Materialsand EnergyYunnan UniversityKunmingYunnan 650091China Department of Chemistry University of Colorado BoulderBoulderColorado 80309USA

Comprehensive Summary,Although polyimides(PIs)have shown great potential for a broad range of applications,it remains very challenging to achieve the malleability,rehealability and recyclability for PIs and their composites targeting various applications,particularly for the rapidly emerging flexible and stretchable ***,malleable conductive poly(imide-imine)hybrid(PIIH)vitrimer-graphene aerogel(GA)composites have been prepared,for the first time,via simple sol-gel film formation followed by *** resulting PIIH-GA composites exhibit not only the highly desired properties of thermosetting(strong mechanical strength)and thermoplastic(reprocessability)polymers,but also good conductivity enabled by the GA ***3-GA-10(with 10 wt%GA)showed one of the highest electrical conductivities(26.7 S/m)for PI-based composites,as well as good electromagnetic interference(EMI)shielding ***,the PIIH-GA films could maintain good performance during stretching and even after chemical recycling,which opens new opportunities for flexible and sustainable electronics development.

关键词： Sol-gel processes Thin films Sustainable chemistry Polyimide thermoset Dynamic covalent bond/Recyclable polymers EMI shielding

Occurrence of microplastics in natural and farmland soil in the Qilian Mountains of the Northern Tibetan Plateau

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Journal of Mountain Science 2024年第7期21卷 2159-2172页

作者： KANG Qiangqiang ZHANG Yulan KANG shichang ZHANG Shengyin luo Xi LI Longrui WANG Zhaoqing ZHANG Shuncun Key Laboratory of Petroleum Resources Exploration and Evaluation Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China

Microplastics(MPs)become ubiquitous in soil and are an environmental and public health concern ***,the status of MPs in natural and farmland soils in remote areas remains poorly *** this study,we investigated the characteristics of MPs in natural and farmland soils along two transects in the Qilian Mountains of the northern Tibetan *** average abundance of MPs in natural and farmland soils was 29,778 and 56,123 items kg^(-1),respectively,with a detection size range of 10-1000μ*** in the size range of 10-100μm accounted for 84.1%of particles *** the 21 polymers detected,polyethylene dominated in both farmland and natural *** shape of MPs was dominated by fragments(95.8%),followed by fibers(3.8%)and beads(0.4%).The abundance of MPs was positively correlated with increasing altitude in natural *** was no significant correlation between the abundance of MPs and soil physicochemical properties due to the narrow range of values of soil physicochemical *** the growing concern regarding MPs pollution,research on the status of MPs in high altitude and remote areas is critical to understanding their global cycle.

关键词： Microplastics pollution Soil Remote areas Tibetan Plateau

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计及分布式电源的配电网双层优化重构

济南大学学报（自然科学版） 2019年第4期33卷 308-318页

作者：罗世昌苏宏升兰州交通大学自动化与电气工程学院

针对传统的含分布式电源(DG)配电网重构方法中存在DG安装位置、容量与重构无法兼顾的问题,提出一种计及DG的配电网双层优化重构策略;建立配电网重构的双层优化模型,其中上层优化模型以电压稳定性指标和DG并入配电网产生的网损变化量为... 详细信息

针对传统的含分布式电源(DG)配电网重构方法中存在DG安装位置、容量与重构无法兼顾的问题,提出一种计及DG的配电网双层优化重构策略;建立配电网重构的双层优化模型,其中上层优化模型以电压稳定性指标和DG并入配电网产生的网损变化量为优化目标,确定DG初始安装位置和容量,并将其作为下层优化模型的初始条件;在上层优化模型的基础上,以网损减小率最大和负荷均衡度变化量最大为目标函数对下层优化模型进行优化,确定重构后的拓扑结构;通过改进和声搜索算法对上、下层模型不断迭代实现双层优化;基于配电网重构与DG安装位置和容量存在相互制约的关系,采用6种优化场景对双层优化策略进行评估,以含DG的IEEE33节点系统为例进行仿真分析。结果表明,所提方法能使配电网重构和DG容量和位置均达到最优,有效减小配电网的网损,改善节点电压水平,提升DG的并网能力。

关键词：分布式电源配电网重构双层优化策略和声搜索算法

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CTS2型道岔转辙机安装与维护

铁道通信信号 2007年第4期43卷 17-19页

作者：罗世昌中铁十二局集团电气化工程有限公司

CTS2型道岔转辙机是国内专用于青藏铁路的新型轨枕式道岔转辙机。结合现场施工实践,总结了CTS2型道岔转辙机安装的组成、工作原理、安装方法及维护方法,为同类设备的安装和维护提供参考。

关键词：道岔转辙机安装维护

TYJL-Ⅱ型计算机联锁设备安装调试及故障处理

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铁路通信信号工程技术 2007年第2期4卷 26-28页

作者：罗世昌中铁十二局集团电气化工程有限公司

本文主要介绍TYJL-Ⅱ型计算机联锁设备安装、调试施工方法,及使用过程常见的。故障处理方法。

关键词：安装调试故障处理计算机联锁

湘东北地区栗山矿区栗山矿段铅锌铜多金属矿床地质特征及找矿方向探讨

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资源信息与工程 2022年第4期37卷 19-23页

作者：罗仕长唐勇明周得林张吉梼湖南省自然资源调查所湖南娄底417000

湘东北地区栗山矿区栗山矿段铅锌铜多金属矿床位于幕阜山岩体南缘与冷家溪群内外接触带处。本文在综合分析栗山矿段成矿地质条件及矿床成因的基础上,提出找矿标志和找矿方向。研究认为,成矿热液通过区域钟洞—幕阜山断裂带运移至其北北... 详细信息

湘东北地区栗山矿区栗山矿段铅锌铜多金属矿床位于幕阜山岩体南缘与冷家溪群内外接触带处。本文在综合分析栗山矿段成矿地质条件及矿床成因的基础上,提出找矿标志和找矿方向。研究认为,成矿热液通过区域钟洞—幕阜山断裂带运移至其北北西向、近南北向、北北东向次级断裂中充填成矿,属中低温热液充填交代型矿床;构造交汇处、蚀变叠加处及赋矿围岩为花岗伟晶岩时有利于成矿;矿段内勘查工作应加强矿区西部空白区找矿和稀有金属综合找矿研究。

关键词：铅锌矿铜矿萤石幕阜山岩体

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考虑风电出力相关性的概率最优潮流计算

三峡大学学报（自然科学版） 2019年第5期41卷 90-95页

作者：董晓阳苏宏升罗世昌兰州交通大学自动化与电气工程学院

为准确分析新能源渗透率不断加大的现代电力系统的运行特点,在传统概率潮流(PLF)计算过程中引入Copula理论来处理输入变量之间的相关性.针对传统PLF计算方法计算过程复杂、较难收敛的弊端,采用低偏差序列实现高效采样,加快算法收敛速度... 详细信息

为准确分析新能源渗透率不断加大的现代电力系统的运行特点,在传统概率潮流(PLF)计算过程中引入Copula理论来处理输入变量之间的相关性.针对传统PLF计算方法计算过程复杂、较难收敛的弊端,采用低偏差序列实现高效采样,加快算法收敛速度,提出一种Copula理论与准蒙特卡洛相结合的PLF计算方法.该方法首先采用准蒙特卡洛对输入变量的概率密度函数实现均匀、高效采样,然后通过Copula理论实现指定相关性向所得低偏差样本的转移.在IEEE-14和IEEE-30节点系统分别进行PLF计算和最优潮流计算验证算法的有效性.仿真结果表明:本文所提方法相较于传统PLF计算方法可准确描述变量之间的相关性,且具有快速收敛的优点.

关键词：概率潮流概率最优潮流 Copula理论准蒙特卡洛相关系数