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Data inversion of multi-dimensional magnetic resonance in porous media

Magnetic Resonance Letters 2023年第2期3卷 127-139,I0004页

作者： fangrong zong Huabing Liu Ruiliang Bai Petrik Galvosas Schoolof Artificial Intelligence Beijing University of Post and TelecommunicationBeijing100876China Beijing Limecho Technology Co Ltd.Beijing102200China Interdisciplinary Institute of Neuroscience and Technology Zhejiang University School of MedicineHangzhou310020China MOE Frontier Science Centerfor Brain Science and Brain-machine Integration School of Brain Science and Brain MedicineZhejiang UniversityHangzhou310030China School of Chemical and Physical Sciences Victoria University of WellingtonWellington6140New Zealand MacDiarmid Institute for Advanced Materials Victoria University of WellingtonWellington6140New Zealand

Since its inception in the 1970s,multi-dimensional magnetic resonance(MR)has emerged as a powerful tool for non-invasive investigations of structures and molecular *** spectroscopy beyond one dimension allows the study of the correlation,exchange processes,and separation of overlapping spectral *** multi-dimensional concept has been re-implemented over the last two decades to explore molecular motion and spin dynamics in porous *** from Fourier transform,methods have been developed for processing the multi-dimensional time-domain data,identifying the fluid components,and estimating pore surface permeability via joint relaxation and diffusion *** the resolution of spectroscopic signals with spatial encoding gradients,multi-dimensional MR imaging has been widely used to investigate the microscopic environment of living tissues and distinguish *** in each voxel are usually expressed as multi-exponential decay,representing microstructures or environments along multiple pore *** separation of contributions from different environments is a common ill-posed problem,which can be resolved ***,the inversion methods and experimental parameters determine the resolution of multi-dimensional *** paper reviews the algorithms that have been proposed to process multidimensional MR datasets in different *** information at the microscopic level,such as tissue components,fluid types and food structures in multi-disciplinary sciences,could be revealed through multi-dimensional MR.

关键词： Multi-dimensional MR Data inversion Porous media Inverse Laplace transform Fouriertransform

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Editorial

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Magnetic Resonance Letters 2023年第2期3卷 87-89页

作者： Ruiliang Bai Xueqian Kong Siegfried Stapf Wei Wang fangrong zong Zhejiang University School of Medicine China. Institute of Translational Medicine Shanghai Jiao Tong UniversityChina Department of Mathematics and Natural Sciences Technische Universitat IlmenauGermany. Department of Chemistry and Chemical Engineering Lanzhou UniversityChina School of artificial intelligence Beijing University of Post and TelecommunicationChina

Porous media are ubiquitous and characterized by a wide range of distinct morphological and topographical properties,often difficult to access by conventional *** a unique technology,magnetic resonance has been applied extensively for several decades to non-invasively characterize the structure,interactions and dynamics of fluids in porous media,as well as these media *** does this via spectroscopy,relaxometry,diffusion,or imaging *** special issue is dedicated to an editorial and a selection of outstanding talks/posters presented at the 15th International Bologna Conference Magnetic Resonance in Porous Media(MRPM15).

关键词： media Porous porous

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基于人工智能的白质纤维束分割方法与研究进展

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北京邮电大学学报 2023年第6期46卷 1-7页

作者：宗芳荣张迪魏婧怡王怡然刘勇北京邮电大学人工智能学院北京100876 北京邮电大学国际学院北京100876 北京邮电大学计算机学院北京100876

基于扩散磁共振成像数据进行纤维追踪可得到白质纤维轨迹,根据纤维特征将其分割成不同簇束有助于临床针对性分析和精确诊疗。首先介绍大脑白质纤维学和分割原理;然后归纳基于体素和基于纤维流线的方法,重点介绍不同基于人工智能的分割... 详细信息

基于扩散磁共振成像数据进行纤维追踪可得到白质纤维轨迹,根据纤维特征将其分割成不同簇束有助于临床针对性分析和精确诊疗。首先介绍大脑白质纤维学和分割原理;然后归纳基于体素和基于纤维流线的方法,重点介绍不同基于人工智能的分割模型并设计实验以展示分割结果;最后总结纤维束分割方法面临的挑战,探讨该领域的研究趋势,展望人工智能技术应用的发展前景,为亚健康人和疾病患者的神经科学研究提供全面的纤维束分割方法总结与诊断支持。

关键词：扩散磁共振成像白质纤维束分割人工智能脑科学

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A Comprehensive Evaluation Method for Sensing Characteristics of Multi-Peak Terahertz Metamaterials Sensor in Polarization Mode

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Photonic Sensors 2023年第4期13卷 12-26页

作者： Yuee WANG Dongxia LI Huiwen LUO Zhi LI fangrong HU Huo ZHANG Lingyao YU Guangxi Key Laboratory of Automatic Detecting Technology and Instruments Guilin University of Electronic TechnologyGuilin 541004China Guilin University of Aerospace Technology Guilin 541004China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China

In this study,the multi-peak terahertz metamaterials sensors are designed and fabricated,whose structures are the asymmetrical single split ring(SSR)and three split rings(TSR).The resonant formation and sensing mechanism of the two structures are investigated by using the finite-difference time-domain(FDTD)*** B6(VB6)and its reactants with bovine serum protein(BSA)are tested as the medium,and the sensing experiments of the SSR and TSR are carried *** experimental and simulation results indicate the consistent law,which is the sensitivity of the resonance in the transverse magnetic(TM)mode is much greater than that in the transverse electric(TE)*** to the weighted average method and the law for unequal precision measuring,the quality factor of the resonance is used as the weighting coefficient to calculate the comprehensive evaluation parameter(CEP)of the multi-peak metamaterials sensors in the TE and TM modes based on the experimental *** the CEP and frequency shifts are as the evaluation parameter in experiments,the law’s variation of the CEP is consistent with that of the frequency shift,indicating that it is feasible to characterize the sensing characteristics of metamaterials with the CEP,which presents simplified characteristics of multi-peak metamaterials at different polarization *** method implies that the different influencing factors may be integrated into the CEP with the idea of weight,which promotes the practical application of the metamaterials *** revelation of the sensing law also provides a method for the design of the terahertz metamaterials sensor with the high sensitivity.

关键词： Terahertz MMs sensor multi-resonance mode polarization mode weighted frequency shift

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Aerobic Oxidation of 2,3,6-Trimethylphenol with Reusable Homogenized Copper Catalysts

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Chemical Research in Chinese Universities 2021年第3期37卷 751-756页

作者： LI Meng WU Mingwei PAN Biwei XU Dandan LVSONG Zhuopu LI Dongqing ZHANG fangrong HUANG Jun State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing211816P.R.China

The oxidation of 2,3,6-trimethylphenol(TMP)can produce both 2,3,5-trimethyl-1,4-benzoquinone(TMQ)and 2,3,5-trimethyl-1,4-hydroquinone(TMHQ)as important intermediates of vitamin *** a soluble and porous polymer of intrinsic microporosity(PIM-1),we developed a highly active and reusable CuO@PIM-1 catalyst for the aerobic oxidation of TMP to TMQ and *** CuO@PIM-1 catalyst is high active and selective for the aerobic oxidation of TMP,and TMQ and TMHQ can be obtained in yields of 81%and 19%,*** CuO@PIM-1 catalyst has both advantages of homogeneous and heterogeneous and the CuO@PIM-1 catalyst showed a higher activity than homogeneous(CuCl_(2))and heterogeneous(supported CuO)***,CuO@PIM-1 catalyst can be recovered easily and reused at least 5 times without deactivation.

关键词： Aerobic oxidation Trimethylphenol Trimethylbenzoquinone Copper PIM-1 CuO@PIM-1

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Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si_3N_4–VO_2–Si_3N_4 sandwich

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Chinese Physics B 2019年第5期28卷 111-116页

作者： Shuai Zhao fangrong Hu Xinlong Xu Mingzhu Jiang Wentao Zhang Shan Yin Wenying Jiang Guangxi Key Laboratory of Optoelectronic Information Processing Guilin University of Electronic Technology Nanobiophotonic Center State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materials and Institute of Photonics &Photon-Technology Northwest University

We experimentally demonstrate an electrically triggered terahertz(THz) dual-band tunable band-pass filter based on Si_3 N_4–VO_2–Si_3 N_4 sandwich-structured hybrid metamaterials. The insulator–metal phase transition of VO_2 film is induced by the Joule thermal effect of the top metal layer. The finite-integration-time-domain(FITD) method and finite element method(FEM) are used for numerical simulations. The sample is fabricated using a surface micromachining process,and characterized by a THz time-domain-spectrometer(TDS). When the bias current is 0.225 A, the intensity modulation depths at two central frequencies of 0.56 THz and 0.91 THz are about 81.7% and 81.3%, respectively. This novel design can achieve dynamically electric–thermo–optic modulation in the THz region, and has potential applications in the fields of THz communications, imaging, sensing, and astronomy exploration.

关键词： tunable band-pass filter hybrid metamaterials terahertz vanadium dioxide (VO2)

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Switchable terahertz polarization converter based on VO_(2)metamaterial

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Chinese Physics B 2022年第6期31卷 403-409页

作者： Haotian Du Mingzhu Jiang Lizhen Zeng Longhui Zhang Weilin Xu Xiaowen Zhang fangrong Hu Guangxi Key Laboratory of Automatic Detecting Technology and Instrument Guilin University of Electronic TechnologyGuilin 541004China Guilin Institute of Information Technology Guilin 541004China

A switchable terahertz(THz)polarization converter based on vanadium dioxide(VO_(2)) metamaterial is *** is a 5-layer structure which containing metal split-ring-resonator(SRR),the first polyimide(PI)spacer,VO_(2) film,the second PI spacer,and metal *** is an array structure and the period in x and y directions is 100μ*** performance is simulated by using finite integration *** simulation results show that,when the VO_(2) is in insulating state,the device is a transmission polarization *** cross-linear polarization conversion can be realized in a broadband of0.70 THz,and the polarization conversion rate(PCR)is higher than 99%.Under thermal stimulus,the VO_(2) changes from insulating state to metallic state,and the device is a reflective polarization *** linear-to-circular polarization conversion can be successfully realized in a broadband of 0.50 THz,and the PCR is higher than 88%.

关键词： switchable terahertz(THz)metamaterial polarization conversion vanadium dioxide(VO_(2))

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Sm-Nd isotopic compositions of Cambrian-Ordovician strata at the Jinggangshan area in Jiangxi Province: Tectonic implications

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Chinese Science Bulletin 2009年第11期54卷 1750-1758页

作者： SHEN WeiZhou LING HongFei SHU LiangShu ZHANG fangrong XIANG Lei State Key Laboratory for Mineral Deposits Research College of Earth Sciences and Engineering Nanjing University Nanjing 210093China Geological Survey Institute Jiangxi Province Nanchang 330030 China

Whole-rock Sm-Nd isotopes were investigated for Cambrian-Ordovician strata from the Jinggangshan area between the Yangtze Block and Cathysia Block in South China. These strata were deposited as a greatly thick unit of muddy-sandy laminas with intercalated carbonate and organic carbon-bearing layers. They have low εNd(t) values of –13.9 to –7.9 and old Nd model ages of 1842 to 2375 Ma. In tDM-tStr diagram, they are far away from the concordant line but fall within the evolution zone of the Proterozoic crust of South China. This indicates that the Cambrian-Ordovician strata are mainly composed of mat- ters eroded from ancient Paleoproterozoic crust that may mainly consist of continental-derived detrital sediments with high maturity in the Cathysia Block. However, the Ordovician Jueshangou Formation and Dui’ershi Formation have εNd(t) values of –10.5 and –7.9 at the higher end of the above range and Nd model ages of 1842 to 2059 Ma at the lower end of the above range. This suggests involvement of more detritus that were eroded from the relatively juvenile crust from Late Paleoproterozoic to the Early Neoproterozoic. All the Nd model ages for the Cambrian-Ordovician sedimentary rocks in the Cathysia Block and the southeastern margin of the Yangtze Block are older than 1800 Ma, suggesting that no material from the Early Paleozoic depleted mantle-derived magmas was involved in these regions.

关键词： Nd同位素井冈山地区地层沉积奥陶系寒武系同位素组成构造意义 Sm

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布莱克诗歌中的伦理思想

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外国文学研究 2005年第6期27卷 20-27页

作者：曾方荣湖南邵阳学院文学院

布莱克是18世纪后半叶、19世纪初的诗人,在特定的时代环境下,他的诗歌艺术有着浓厚的文化底蕴和丰富的伦理思想。在表面看来,布莱克的诗歌飘忽而难懂,但就其诗歌的表现主题来说,传达了他关注人性之真、倡导人类的自由、探索人类幸福的... 详细信息

布莱克是18世纪后半叶、19世纪初的诗人,在特定的时代环境下,他的诗歌艺术有着浓厚的文化底蕴和丰富的伦理思想。在表面看来,布莱克的诗歌飘忽而难懂,但就其诗歌的表现主题来说,传达了他关注人性之真、倡导人类的自由、探索人类幸福的永远存在方式,表现了他力图建立一个美好的人间伦理天国的理想,这不仅使他的诗歌具有浓郁的美学色彩,也有丰厚的伦理关怀。布莱克是19世纪英国浪漫主义诗人群中具有道德观与社会责任感的重要诗人之一,其作品中的理想性、神秘性及宗教精神都应当引起人们的更大关注。

关键词：布莱克美善和谐幸福伦理

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人工智能在生物医药领域中的应用和进展

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中国药科大学学报 2023年第3期54卷 263-268页

作者：言方荣中国药科大学理学院医药大数据与人工智能研究院南京211198

近年来人工智能得到了快速发展,其在很大程度上改变了现代的生活方式。同时,人工智能极大地促进了医药行业的发展,在精准医学、智能诊断、计算机辅助药物设计以及临床试验决策等环节均发挥了关键作用,也在与医药产业的结合中极大地发展... 详细信息

近年来人工智能得到了快速发展,其在很大程度上改变了现代的生活方式。同时,人工智能极大地促进了医药行业的发展,在精准医学、智能诊断、计算机辅助药物设计以及临床试验决策等环节均发挥了关键作用,也在与医药产业的结合中极大地发展了自身。本文概述了人工智能研究中的关键问题,阐述人工智能在健康医药产业中的关键应用,并分析人工智能在健康医药产业中机遇与挑战,为人工智能在健康医药产业领域的发展提供参考。

关键词：人工智能健康医药精准医学智能诊断计算机辅助药物设计临床试验决策

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