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电化学阻抗谱机器学习评估动力电池状态研究进展

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电源技术 2024年第8期48卷 1494-1502页

作者：姜岱延金玉红张子恒刘晶冰张媛李思全汪浩北京工业大学材料科学与工程学院北京100124 国网重庆市电力公司重庆401121

退役动力锂电池(额定容量80%以上)梯次利用可有效缓解电池回收和环境污染压力,提高资源利用率和经济效益,然而对其进行快速、无损和准确的状态评估仍是一个挑战。与其他已报道的方法相比,电化学交流电测量电池并收集数据绘制阻抗谱图是... 详细信息

退役动力锂电池(额定容量80%以上)梯次利用可有效缓解电池回收和环境污染压力,提高资源利用率和经济效益,然而对其进行快速、无损和准确的状态评估仍是一个挑战。与其他已报道的方法相比,电化学交流电测量电池并收集数据绘制阻抗谱图是研究电池状态的核心方法,具有快速、无损这两种优势。通过这种方式检测的电池可以建立起内部阻抗和状态相关性,快速完成电池状态评测。电化学阻抗谱图的分析方法主要包括依靠测量数据和机器学习的方法进行阻抗的预测,依靠等效电路图对电路各个等效元件的变化情况进行分析,以及用积分算法将阻抗谱图转化为更直观的弛豫时间分布图谱。这些方法都提供了电池内部老化情况的分析方法,为电池内部阻抗和健康状态之间的联系提供了电化学方面的基础。基于此,综述了电化学阻抗谱结合机器学习评估动力锂电池状态在国内外最新研究进展,重点针对电化学阻抗谱、等效电路模型、弛豫时间分布和机器学习之间的关系进行总结和探讨。

关键词：电池状态电化学阻抗谱图机器学习等效电路模型弛豫时间分布

基于关联分析和聚类分析的EGFR-TKI相关皮疹中药用药规律分析

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临床合理用药杂志 2024年第10期17卷 26-32页

作者：余佳霖顾佳麟魏国利刘静冰李灵常霍介格南京中医药大学附属中西医结合医院/江苏省中医药研究院肿瘤科南京市210028 南京中医药大学南京市210028

目的分析表皮生长因子受体酪氨酸激酶抑制剂(EGFR-TKI)相关皮疹中药用药规律,以指导临床用药。方法计算机检索中国知网(CNKI)、万方数据知识服务平台、维普网、PubMed数据库,纳入内服或外用中药治疗EGFR-TKI相关皮疹的临床试验研究,... 详细信息

目的分析表皮生长因子受体酪氨酸激酶抑制剂(EGFR-TKI)相关皮疹中药用药规律,以指导临床用药。方法计算机检索中国知网(CNKI)、万方数据知识服务平台、维普网、PubMed数据库,纳入内服或外用中药治疗EGFR-TKI相关皮疹的临床试验研究,分别对内服、外用中药的频数、药物性味、归经、功效进行统计,并对高频中药进行关联分析和聚类分析。结果共纳入文献36篇,包含方剂44首,用法分为内服法、外用法。内服中药方剂24首,纳入中药83味,使用频次较高的中药为甘草、金银花、白鲜皮;外用中药方剂20首,纳入中药51味,使用频次较高的中药为紫草、白鲜皮、苦参。内服、外用中药中频次较高的性味均为寒、温、平,苦味、甘味、辛味,归经均以归肝经、肺经、胃经为主,功效以清热药、补虚药为主。对高频药物进行关联分析和聚类分析,得出高频内服中药组合13对,高频外用中药组合7对,二者均可形成4个类聚方。结论中药治疗EGFR-TKI相关皮疹内服以清热补虚,兼具祛邪与养阴之功,外用则主要以清热燥湿止痒为主,高频中药的关联分析和聚类分析为临床提供治疗思路与方法。

关键词：表皮生长因子受体酪氨酸激酶抑制剂皮疹关联分析聚类分析用药规律

Robust zero-watermarking algorithm based on discrete wavelet transform and daisy descriptors for encrypted medical image

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CAAI Transactions on Intelligence Technology 2024年第1期9卷 40-53页

作者： Yiyi Yuan jingbing Li Jing liu Uzair Aslam Bhatti Zilong liu Yen-wei Chen School of Information and Communication Engineering Hainan UniversityHaikouChina Research Center for Healthcare Data Science Zhejiang LabHangzhouChina Graduate School of Information Science and Engineering Ritsumeikan University ShigaJapan

In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical *** address this problem,the authors propose a robust feature watermarking algorithm for encrypted medical images based on multi-stage discrete wavelet transform(DWT),Daisy descriptor,and discrete cosine transform(DCT).The algorithm initially encrypts the original medical image through DWT-DCT and Logistic ***,a 3-stage DWT transformation is applied to the encrypted medical image,with the centre point of the LL3 sub-band within its low-frequency component serving as the sampling *** Daisy descriptor matrix for this point is then ***,a DCT transformation is performed on the Daisy descriptor matrix,and the low-frequency portion is processed using the perceptual hashing algorithm to generate a 32-bit binary feature vector for the medical *** scheme utilises cryptographic knowledge and zero-watermarking technique to embed watermarks without modifying medical images and can extract the watermark from test images without the original image,which meets the basic re-quirements of medical image *** embedding and extraction of water-marks are accomplished in a mere 0.160 and 0.411s,respectively,with minimal computational *** results demonstrate the robustness of the algorithm against both conventional attacks and geometric attacks,with a notable performance in resisting rotation attacks.

关键词： daisy descriptor DCT DWT encryption domain medical image zero-watermarking

Research Progress in Improving the Rate Performance of LiFePO_4 Cathode Materials

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Nano-Micro Letters 2014年第3期6卷 209-226页

作者： Sixu Deng Hao Wang Hao liu jingbing liu Hui Yan The College of Materials Science and Engineering Beijing University of Technology Chengdu Green Energy and Green Manufacturing Technology R&D Centre

Olivine lithium iron phosphate(Li Fe PO4) is considered as a promising cathode material for high power density lithium ion battery due to its high capacity, long cycle life, environmental friendly, low cost, and safety consideration. The theoretical capacity of Li Fe PO4 based on one electron reaction is 170 m Ah g-1at the stable voltage plateau of 3.5 V vs. Li/Li+. However, the instinct drawbacks of olivine structure induce a poor rate performance, resulting from the low lithium ion diffusion rate and low electronic *** this review, we summarize the methods for enhancing the rate performance of Li Fe PO4 cathode materials,including carbon coating, elements doping, preparation of nanosized materials, porous materials and composites,etc. Meanwhile, the advantages and disadvantages of above methods are also discussed.

关键词： LiFePO4 Lithium ion battery Rate performance

Research Progress in Improving the Cycling Stability of High-Voltage LiNi0.5Mn1.5O4 Cathode in Lithium-Ion Battery

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Nano-Micro Letters 2017年第2期9卷 97-115页

作者： XiaoLong Xu SiXu Deng Hao Wang jingbing liu Hui Yan The College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124People’s Republic of China

High-voltage lithium-ion batteries(HVLIBs) are considered as promising devices of energy storage for electric vehicle, hybrid electric vehicle, and other high-power equipment. HVLIBs require their own platform voltages to be higher than 4.5 V on charge. Lithium nickel manganese spinel LiNi_(0.5)Mn_(1.5)O_4(LNMO) cathode is the most promising candidate among the 5 V cathode materials for HVLIBs due to its flat plateau at 4.7 V. However, the degradation of cyclic performance is very serious when LNMO cathode operates over 4.2 V. In this review, we summarize some methods for enhancing the cycling stability of LNMO cathodes in lithium-ion batteries, including doping, cathode surface coating,electrolyte modifying, and other methods. We also discuss the advantages and disadvantages of different methods.

关键词： High-voltage cathode LiNi0.5Mn1.5O4 Lithium-ion battery Cycling stability Platform voltage

Recent progresses in the suppression method based on the growth mechanism of lithium dendrite

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Journal of Energy Chemistry 2018年第2期27卷 513-527页

作者： Xiaolong Xu Suijun Wang Hao Wang Chen Hu Yi Jin jingbing liu Hui Yan The College of Materials Science and Engineering Beijing University of Technology State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute

Lithium secondary batteries（LSBs） with high energy densities need to be further developed for future applications in portable electronic devices, electric vehicles, hybrid electric vehicles and smart grids. Lithium metal is the most promising electrode for next-generation rechargeable batteries. However, the formation of lithium dendrite on the anode surface leads to serious safety concerns and low coulombic ***, researchers have made great efforts and significant progresses to solve these problems. Here we review the growth mechanism and suppression method of lithium dendrite for LSBs’ anode protection. We also establish the relationship between the growth mechanism and suppression method. The research direction for building better LSBs is given by comparing the advantages and disadvantages of these methods based on the growth mechanism.

关键词： Lithium dendrite Growth mechanism Suppression method Lithium secondary battery

The Surface Coating of Commercial LiFePO_4 by Utilizing ZIF-8 for High Electrochemical Performance Lithium Ion Battery

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Nano-Micro Letters 2018年第1期10卷 3-11页

作者： XiaoLong Xu CongYu Qi ZhenDong Hao Hao Wang JinTing Jiu jingbing liu Hui Yan Katsuaki Suganuma The College of Materials Science and Engineering Beijing University of Technology The Institute of Scientific and Industrial Research Osaka University

The requirement of energy-storage equipment needs to develop the lithium ion battery(LIB) with high electrochemical performance. The surface modification of commercial LiFePO_4(LFP) by utilizing zeolitic imidazolate frameworks-8(ZIF-8) offers new possibilities for commercial LFP with high electrochemical *** this work, the carbonized ZIF-8(C_(ZIF-8)) was coated on the surface of LFP particles by the in situ growth and carbonization of ZIF-8. Transmission electron microscopy indicates that there is an approximate 10 nm coating layer with metal zinc and graphite-like carbon on the surface of LFP/C_(ZIF-8) sample. The N_2 adsorption and desorptionisotherm suggests that the coating layer has uniform and simple connecting mesopores. As cathode material, LFP/C_(ZIF-8) cathode-active material delivers a discharge specific capacity of 159.3 m Ah g^(-1) at 0.1 C and a discharge specific energy of 141.7 m Wh g^(-1) after 200 cycles at 5.0 C(the retention rate is approximate 99%). These results are attributed to the synergy improvement of the conductivity,the lithium ion diffusion coefficient, and the degree of freedom for volume change of LFP/C_(ZIF-8) cathode. This work will contribute to the improvement of the cathode materials of commercial LIB.

关键词： LiFePO4 Zeolitic imidazolate frameworks-8 Surface coating Cathode Lithium ion battery

宫腔镜电切术治疗子宫内膜息肉不孕症患者的效果

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中国民康医学 2023年第7期35卷 50-52页

作者：刘静冰郑州市中牟县人民医院妇科河南郑州451450

目的:观察宫腔镜电切术治疗子宫内膜息肉不孕症患者的效果。方法:选取2018年6月至2020年6月该院收治的108例子宫内膜息肉不孕症患者进行前瞻性研究,按照随机数字表法将其分为对照组和观察组各54例。对照组给予宫腔镜刮宫术治疗,观察组... 详细信息

目的:观察宫腔镜电切术治疗子宫内膜息肉不孕症患者的效果。方法:选取2018年6月至2020年6月该院收治的108例子宫内膜息肉不孕症患者进行前瞻性研究,按照随机数字表法将其分为对照组和观察组各54例。对照组给予宫腔镜刮宫术治疗,观察组给予宫腔镜电切术治疗。比较两组手术相关指标(手术时间、术中出血量、住院时间)水平、手术前后月经量、术后并发症发生率、复发率和妊娠率。结果:两组手术时间、术中出血量、住院时间比较,差异均无统计学意义(P>0.05);术后1、3个月,两组月经量均少于术前,且观察组少于对照组,差异有统计学意义(P<0.05);观察组术后并发症发生率为3.70%,明显低于对照组的14.82%,差异有统计学意义(P<0.05);观察组妊娠率高于对照组,复发率低于对照组,差异均有统计学意义(P<0.05)。结论:宫腔镜电切术治疗子宫内膜息肉不孕症患者可减少术后月经量,降低并发症发生率和复发率,提高妊娠率,优于宫腔镜刮宫术治疗效果。

关键词：宫腔镜电切术刮宫术子宫内膜息肉不孕症月经量妊娠率并发症

The Flexible and Multifunctional PANI Electrochemical film based on highly stable Ag@Pt AHNW Transparent lectrode

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The Flexible and Multifunctional PANI Electrochemical film b...