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Causal temporal graph attention network for fault diagnosis of chemical processes

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Chinese Journal of Chemical Engineering 2024年第6期70卷 20-32页

作者： Jiaojiao luo Zhehao Jin Heping Jin Qian Li Xu Ji yiyang Dai School of Chemical Engineering Sichuan UniversityChengdu 610065China China Three Gorges Corporation Beijing 100038China

Fault detection and diagnosis(FDD)plays a significant role in ensuring the safety and stability of chemical *** the development of artificial intelligence(AI)and big data technologies,data-driven approaches with excellent performance are widely used for FDD in chemical ***,improved predictive accuracy has often been achieved through increased model complexity,which turns models into black-box methods and causes uncertainty regarding their *** this study,a causal temporal graph attention network(CTGAN)is proposed for fault diagnosis of chemical processes.A chemical causal graph is built by causal inference to represent the propagation path of *** attention mechanism and chemical causal graph were combined to help us notice the key variables relating to fault *** in the Tennessee Eastman(TE)process and the green ammonia(GA)process showed that CTGAN achieved high performance and good explainability.

关键词： Chemical processes Safety Fault diagnosis Causal discovery Attention mechanism Explainability

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木鳖子苷Ⅱ的生物活性、结构及纯度测定

生命的化学 2024年第1期44卷 165-176页

作者：吴子薇时晓颖麻文谦罗翌玚李晓波王梦月上海交通大学药学院上海200240 上海市松江区中心医院骨科上海201600

木鳖子苷Ⅱ结构复杂,为木鳖子的主要成分、特征性成分,然而其生物活性、完整的核磁数据、纯度分析方法均未见报道。本研究首先对其生物活性进行了研究,发现木鳖子苷Ⅱ具有显著细胞毒活性、抗炎活性。然后,运用2D NMR技术,结合酸水解方法... 详细信息

木鳖子苷Ⅱ结构复杂,为木鳖子的主要成分、特征性成分,然而其生物活性、完整的核磁数据、纯度分析方法均未见报道。本研究首先对其生物活性进行了研究,发现木鳖子苷Ⅱ具有显著细胞毒活性、抗炎活性。然后,运用2D NMR技术,结合酸水解方法,快速确定了其化学结构,首次完成了NMR数据全归属。最后,以对羟基苯甲酸为内标,建立了测定木鳖子苷Ⅱ纯度的1H-NMR方法,该方法不需要特殊对照品,操作简便、快速准确。本研究不仅为木鳖子苷Ⅱ的深入研究提供了科学依据,也为复杂皂苷类成分的结构及纯度测定提供了方法参考。

关键词：木鳖子苷Ⅱ 木鳖子细胞毒性抗炎核磁共振信号归属纯度测定

Real-time dynamics of soliton triplets in fiber lasers

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Photonics Research 2020年第6期8卷 884-891页

作者： yiyang luo RAN XIA PERRY PING SHUM WENJUN NI YUSONG LIU HUY QUOC LAM QIZHEN SUN XIAHUI TANG LUMING ZHAO CINTRA CNRS/NTU/THALES UMI 3288Research Techno Plaza50 Nanyang DriveSingapore 637553Singapore School of Electrical and Electronic Engineering Nanyang Technological UniversitSingapore 639798Singapore School of Optical and Electronic Information&Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Temasek Laboratories@NTU Research Techno Plaza50 Nanyang DriveSingapore 637553Singapore

The evolution of soliton molecules emphasizes the complex soliton dynamics akin to matter *** the simplest soliton molecule-a soliton pair constituted by two bound pulses-soliton molecules with more constituents have more degrees of freedom because of the temporal pulse separations and relative *** we detailedly characterize the transient dynamics of soliton triplets in fiber lasers by using the dispersive Fourier transform measurement.A particular form of leading,central,and tailing pulses is constructed to shed new light on more intriguing scenarios and fuel the molecular *** the vibrating dynamics of the central and tailing pulses are captured near the regime of equally spaced soliton triplets,which is reminiscent of the recurrent timing jitters within multi-pulse *** insights enable acess into a universal form of unequally spaced soliton triplets interpreted as 2+1 soliton *** binding strengths of intramo-lecular and intermolecular bonds are validated with respect to the diverse internal motions involved in this soliton triplet *** these findings unveil the transient dynamics with more degrees of freedom as well as highlight the possible application for all-optical bit storage.

关键词： fiber soliton dynamics

Self-synchronized temporal-spectral characterization system for revealing ultrafast fiber laser dynamics

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Photonics Research 2023年第2期11卷 173-180页

作者： YULONG CAO ZHENGHU CHANG QIANG WU JINGSHENG HUANG LAIYANG DANG AI LIU yiyang luo LIGANG HUANG WEI HUANG LEI GAO TAO ZHU Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

Due to the electronic bottleneck limited real-time measurement speed of common temporal-spectral detection and the particle-like nature of optical soliton enabled nonrepeatable transient behaviors, capturing the ultrafast laser pulses with unknown times of arrival and synchronously characterizing their temporal-spectral dynamic evolution is still a challenge. Here, using the Raman soliton frequency shift based temporal magnifier and dispersive Fourier transform based spectral analyzer, we demonstrate a self-synchronized, ultrafast temporal-spectral characterization system with a resolution of 160 fs and 0.05 nm, and a recording length above milliseconds. The synchronized nonlinear process makes it possible to image full-filled temporal sub-picosecond pulse trains regardless of their arrival times and without extra pump lasers and photoelectric conversion devices. To demonstrate the significance of this improvement, a buildup dynamic process of a soliton laser with a complex breakup and collisions of multisolitons is visually displayed in the spectral and temporal domains. The soliton dynamic evolution processes observed by our characterization system are in one-to-one correspondence with the numerical simulation results. We believe this work provides a new multidimensional technique to break the electronic bottleneck to gain additional insight into the dynamics of ultrafast lasers and nonlinear science.

关键词： fiber pump soliton

Phase-tailored assembly and encoding of dissipative soliton molecules

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Light(Science & Applications) 2023年第6期12卷 1061-1070页

作者： Yusong Liu Siyun Huang Zilong Li Haoguang Liu Yixiang Sun Ran Xia Lisong Yan yiyang luo Huanhuan Liu Gang Xu Qizhen Sun Xiahui Tang Perry Ping Shum School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Optoelectronic Technology and Systems(Ministry of Education) Chongqing UniversityChongqingChina School of Engineering and Materials Science Queen Mary University of LondonLondonUK Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhenChina

Self-assembly of particle-like dissipative solitons,in the presence of mutual interactions,emphasizes the vibrant concept of soliton molecules in varieties of laser *** manipulation of the molecular patterns,held by the degrees of freedom of internal motions,still remains challenging to explore more efficient and subtle tailoring approaches for the increasing ***,we report a new phase-tailored quaternary encoding format based on the controllable internal assembly of dissipative soliton *** manipulation of the energy exchange of soliton-molecular elements stimulates the deterministic harnessing of the assemblies of internal ***-assembled soliton molecules are tailored into four phase-defined regimes,thus constituting the phase-tailored quaternary encoding *** phase-tailored streams are endowed with great robustness and are resistant to significant timing *** these results experimentally demonstrate the programmable phase tailoring and exemplify the application of the phase-tailored quaternary encoding,prospectively promoting high-capacity all-optical storage.

关键词： soliton dissipative quaternary

耦合Gross-Pitaevskii方程的高效保质量守恒格式

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江西师范大学学报（自然科学版） 2023年第2期47卷 194-198页

作者：李羽孔令华罗奕杨江西师范大学数学与统计学院江西南昌330022 江西省应用数学中心江西南昌330022

该文为耦合Gross-Pitaevskii方程提出了一个新的保质量守恒格式.首先对空间导数利用高阶紧致格式离散得到半离散格式;然后在时间方向上利用基于外推的Crank-Nicolson格式离散,得到一个半显式的数值格式,然而此格式不能保持GP方程固有的... 详细信息

该文为耦合Gross-Pitaevskii方程提出了一个新的保质量守恒格式.首先对空间导数利用高阶紧致格式离散得到半离散格式;然后在时间方向上利用基于外推的Crank-Nicolson格式离散,得到一个半显式的数值格式,然而此格式不能保持GP方程固有的质量守恒,因此,对格式得到的数值解利用投影方法进行修正,使其满足离散质量守恒;最后通过数值实验验证了该格式具有高精度以及保持质量守恒.

关键词：耦合Gross-Pitaevskii方程投影法高阶紧致格式质量守恒

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CD47与淋巴瘤免疫治疗相关性的研究进展

肿瘤防治研究 2021年第8期48卷 799-803页

作者：罗宜洋冯晓莉国家癌症中心国家肿瘤临床医学研究中心中国医学科学院北京协和医学院肿瘤医院病理科北京100021

CD47属于免疫球蛋白超家族成员,在人体多种细胞和组织上均有表达,但在肿瘤细胞上表达得更多,特别是在各种造血系统肿瘤中高表达。肿瘤细胞上表达的CD47与巨噬细胞上的信号调节蛋白α(SIRPα)结合抑制巨噬细胞对肿瘤的吞噬作用可导致肿... 详细信息

CD47属于免疫球蛋白超家族成员,在人体多种细胞和组织上均有表达,但在肿瘤细胞上表达得更多,特别是在各种造血系统肿瘤中高表达。肿瘤细胞上表达的CD47与巨噬细胞上的信号调节蛋白α(SIRPα)结合抑制巨噬细胞对肿瘤的吞噬作用可导致肿瘤免疫逃逸。近年来CD47成为肿瘤研究的新热点,本文就CD47的结构与表达、CD47-SIRPα、靶向CD47抗体药物与淋巴瘤免疫治疗相关性研究作一综述。

关键词： CD47 SIRPα 免疫逃逸淋巴瘤免疫治疗

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基于随机占优的中国股指期货高频套利研究

管理工程学报 2022年第5期36卷 196-204页

作者：付志能徐维军张卫国罗艺旸华南理工大学工商管理学院广东广州510641 华南师范大学经济管理学院广东广州510006

高频套利交易以其风险较低、收益稳定的特点而受到投资者的青睐。随机占优因其无需对资产收益率的分布作任何前提假设的优点而被广泛用于资产比较。本文基于一个新的视角,利用随机占优方法对高频数据进行建模,分析投资者对不同股指期货... 详细信息

高频套利交易以其风险较低、收益稳定的特点而受到投资者的青睐。随机占优因其无需对资产收益率的分布作任何前提假设的优点而被广泛用于资产比较。本文基于一个新的视角,利用随机占优方法对高频数据进行建模,分析投资者对不同股指期货的偏好,从而预测股指期货的高频套利机会和套利方向,进而构建出新的等权对冲高频套利策略。考虑到高频数据的特点,本文还对已有文献的随机占优检验方法进行改进,提出了插值网格非对称DD检验法。本文基于我国三大股指期货上市以来的1分钟高频数据进行实证分析,并利用8个指标来评价模拟交易的结果。实证结果显示,本文提出的基于随机占优的股指期货高频套利策略取得了非常好的投资表现,且插值网格非对称DD检验法显著优于已有文献的随机占优检验方法。实证结果还揭示了二阶占优比三阶占优更能体现投资者对股指期货的偏好,以及风险规避者比风险寻求者在股指期货套利交易中获利更多等市场规律。

关键词：随机占优高频套利股指期货 DD检验法

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浅析如何提升县级供电企业配网运维水平

农村电气化 2022年第9期 92-93页

作者：罗熠旸贵州电网有限责任公司贵阳乌当供电局贵州乌当550018

以县级供电企业为例,对提升企业配网运维水平方式方法展开探讨,旨在有效提高县级供电企业配网运维水平,实现对我国县级供电业发展的有效推动。

关键词：配网运维管理县级供电企业巡视检修低压地区