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MDvT: introducing mobile three-dimensional convolution to a vision transformer for hyperspectral image classification

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International Journal of Digital Earth 2023年第1期16卷 1469-1490页

作者： Xinyao Zhou Wenzuo Zhou Xiaoli Fu yichen hu and Jinlian Liu of Geographical Sciences Southwest UniversityChongqingPeople's Republic of China

Hyperspectral images carry numerous spectral bands,and their wealth of band data is a valuable source of information for the accurate classification of ground ***-dimensional(3D)convolution,although an excellent spectral information extraction method,is limited by its huge number of parameters and long model training *** allow better integration of 3D convolution with the most popular transformer models currently available,a new architecture called mobile 3D convolutional vision transformer(MDvT)is *** MDvT introduces inverted residual structure to reduce the number of model parameters and balance the data mining efficiency of low-dimensional data ***,a square patch is used to cut the sequence of tokens to accelerate the model *** extensive experiments,we evaluated the classification overall performance of the proposed MDvT on the Whu-Hi and Pavia University datasets,and demonstrated significant improvements in classification accuracy and model runtime compared with classical deep learning *** is worth noting that compared with directly integrating 3D convolution into the transformer model,the MDvT architecture improves the accuracy while reducing the time to train an epoch by approximately 58.54%.To facilitate the reproduction of the work in this paper,the model code is available at https://***/gloryofroad/MDvT.

关键词： Hyperspectral image Classification Convolutional neural network Transformer

Synthesis and orientational assemblies of MgO nanosheets with exposed(111) facets

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Chinese Chemical Letters 2018年第6期29卷 935-938页

作者： Min Tang Yuanhang Ren yichen hu Lin Ye Bin Yue Heyong He Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy Materials Fudan University

MgO nanosheets with exposed（111） facets were obtained through the preparation of Mg（OH）2 precursor by a hydrothermal method in the presence of oleylamine and subsequent calcination in air. The different preferred orientational assemblies of Mg O nanosheets, achieved by adjusting the polarity of dispersing solvents（ethanol and cyclohexane） during the sample preparation, show different structural and spectral features.

关键词： MgO Orientational assembly Polar and non-polar solvents X-ray diffraction UV-vis spectroscopy

Synthesis of Cs_(2.5)H_(0.5)PW_(12)O_(40)/TiO_(2) Nanocomposites with Dominant TiO_(2){001}Facets and Related Photocatalytic Properties

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Chinese Journal of Chemistry 2014年第11期32卷 1151-1156页

作者： yichen hu Yuanhang Ren Gangfeng Tang Cheng Wang Min Tang Bin Yue Heyong He Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200433China

TiO_(2)nanosheets with dominant{001}facets,coupled with Cs_(2.5)H_(0.5)PW_(12)O_(40),were successfully synthesized by a one-step hydrothermal *** photocatalytic activity of nanocatalysts was evaluated by the degradation of Rhodamine B under UV light *** results showed that both the addition of Cs_(2.5)H_(0.5)PW_(12)O_(40)and the exposed{001}facets of TiO_(2)have a positive effect on the photocatalytic *** improved photoactivity of nanocomposites in comparison with that of TiO_(2)nanosheets could be attributed to the synergistic effect between Cs_(2.5)H_(0.5)PW_(12)O_(40)and TiO_(2)which facilitates the separation of photo-induced hole-electron pairs.

关键词： anatase TiO_(2) {001}facets cesium tungstophosphate photocatalysis

Injectable thermo-responsive nano-hydrogel loading triptolide for the anti-breast cancer enhancement via localized treatment based on “two strikes” effects

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Acta Pharmaceutica Sinica B 2020年第11期10卷 2227-2245页

作者： Yaoyao Luo Jingjing Li yichen hu Fei Gao George Pak-Heng Leung Funeng Geng Chaomei Fu Jinming Zhang College of Pharmacy Chengdu University of Traditional Chinese MedicineChengdu 611137China Department of Pharmacology and Pharmacy University of Hong KongHongKong 999077China College of Pharmacy and Biological Engineering Chengdu UniversityChengdu 610100China Sichuan Key Laboratory of Medical American Cockroach Chengdu 615000China

The clinical application of triptolide(TPL)in tumor therapy has been greatly limited by its toxicity and inefficient ***,a localized and sustained-release thermo-sensitive hydrogel was developed for the intra-tumor administration of *** on the amphiphilic structure of poly(N-isopropylacrylamide-co-acrylic acid)-g-F68 copolymer,it was able to form nano-micelles to efficiently encapsulate TPL,and then turn into a hydrogel at ***@nano-gel exhibited a sustained drug release profile in vitro and a stronger anticancer effect caused by"two strikes".The"first strike"was its enhanced cytotoxicity compared to free TPL,due to the enhanced pro-apoptosis effect observed in both MDA-MB-231 and MCF-7 cells caused by the regulation of endogenous mitochondrial ***,TPL@nano-gel exhibited a"second-strike"through its anti-angiogenesis capabilities mediated through VEGFR-2 signaling *** expected,after intra-tumoral injection at a 0.45 mg/kg TPL-equivalent dose three times over 14 days in 4 T1 tumor-bearing mice,TPL@nano-gel led to lower systemic toxicity and higher antitumor efficacy compared to multiple injections of *** this regard,these findings indicate that this injectable thermo-responsive hydrogel carries great potential for TPL as a safe and effective cancer therapy.

关键词： Thermo-responsive hydrogel Triptolide Tumor local treatment Breast cancer Anti-angiogenesis Pro-apoptosis Micelle Survival rate

Cobalt phthalocyanine-based conjugated polymer as efficient and exclusive electrocatalyst for CO_(2) reduction to ethanol

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Materials Reports(Energy) 2023年第1期3卷 100-106,I0004页

作者： Dong Jiang Ran Bu Wei Xia yichen hu Mengchen Zhou Enqing Gao Toru Asahi Yusuke Yamauchi Jing Tang School of Chemistry and Molecular Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesEast China Normal UniversityShanghai200062China Department of Life Science&Medical Bioscience School of Advanced Science and EngineeringWaseda University2-2 Wakamatsu-choShinjukuTokyo 162-8480 Japan International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukuba305-0044IbarakiJapan Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbane4072QueenslandAustralia Institute of Eco-Chongming Shanghai202162China

Electrocatalytic conversion of carbon dioxide to high value-added chemicals is a promising method for solving the energy crisis and global *** active metal-containing conjugated polymers have been widely studied for heterogeneous carbon dioxide *** the present contribution,we designed and synthesized a stable cobalt phthalocyanine-based conjugated polymer,named CoPPc-TFPPy-CP,and also explored its electro-catalytic application in carbon dioxide reduction to liquid products in an aqueous *** the catalyst,cobalt phthalocyanine acts as building blocks connected with 1,3,6,8-tetrakis(4-formyl phenyl)pyrenes via imine-linkages,leading to mesoporous formation polymers with the pore size centered at *** the central co-balt atoms shifted to a higher oxidation state after *** these chemical and structural natures,the catalyst displayed a remarkable electrocatalytic CO_(2) reduction performance with an ethanol Faradaic efficiency of 43.25%at-1.0V vs *** at the same time,the electrochemical reduction process catalyzed by cobalt phthalocyanine produced only carbon monoxide and *** the best of our knowledge,CoPPc-TFPPy-CP is the first example among organic polymers and metal-organic frameworks that produces ethanol from CO_(2) with a remarkable selectivity.

关键词： Cobalt phthalocyanine based conjugated polymer Carbon dioxide electroreduction Liquid products Ethanol

Alterations in gut microbiota and metabolites associated with altitude-induced cardiac hypertrophy in rats during hypobaric hypoxia challenge

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Science China(Life Sciences) 2022年第10期65卷 2093-2113页

作者： Zhiyuan Pan yichen hu Zongyu huang Ni Han Yan Li Xiaomei Zhuang Jiye Yin hui Peng Quansheng Gao Wenpeng Zhang Yong huang Yujun Cui Yujing Bi Zhenjiang Zech Xu Ruifu Yang State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBejing 10o071China State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China State Key Laboratory of Toxicology and Medical Countermeasures Beijing Institute of Pharmacology and ToxicologyBejing 100850China Tianjin Institute of Environmental&Operational Medicine Tianjin 300050China Microbiome Medicine Center Department of Laboratory MedicineZhujiang HospitalSouthern Medical UniversityGuangzhou510280China

The gut microbiota is involved in host responses to high ***,the dynamics of intestinal microecology and their association with altitude-related illness are poorly ***,we used a rat model of hypobaric hypoxia challenge to mimic plateau exposure and monitored the gut microbiome,short-chain fatty acids(SCFAs),and bile acids(BAs)over 28 *** identified weight loss,polycythemia,and pathological cardiac hypertrophy in hypoxic rats,accompanied by a large compositional shift in the gut microbiota,which is mainly driven by the bacterial families of Prevotellaceae,Porphyromonadaceae,and *** aberrant gut microbiota was characterized by increased abundance of the Parabacteroides,Alistipes,and Lactococcus genera and a larger Bacteroides to Prevotella ***-omics analyses showed that the gut microbiome was significantly correlated with the metabolic abnormalities of SCFAs and BAs in feces,suggesting an interaction network remodeling of the microbiome-metabolome after the hypobaric hypoxia ***,the transplantation of fecal microbiota significantly increased the diversity of the gut microbiota,partially inhibited the increased abundance of the Bacteroides and Alistipes genera,restored the decrease of plasma propionate,and moderately ameliorated cardiac hypertrophy in hypoxic *** results provide an insight into the longitudinal changes in intestinal microecology during the hypobaric hypoxia *** in the gut microbiota and microbial metabolites contribute to the development of high-altitude heart disease in rats.

关键词： high altitude gut microbiota short-chain fatty acids bile acids hypobaric hypoxia cardiac hypertrophy

Rapid determination of pesticide residues in Chinese materia medica using QuEChERS sample preparation followed by gas chromatography-mass spectrometry

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Acta Pharmaceutica Sinica B 2012年第3期2卷 286-293页

作者： yichen hu Li Wan Jinming Zhang Fang Yang Jiliang Cao Pharmacy College Chengdu University of Traditional Chinese MedicineChengdu 611137China The Ministry of Education Key Laboratory of Standardization of Chinese Herbal Medicine Chengdu 611137China State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine ResourcesChengdu 611137China Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100094China

Pesticide residue analysis plays an important role in the quality control of Chinese materia *** paper reports the development and validation of an analytical method for the quantitative determination of the residues of 39 pesticides in 12 different matrices of Chinese materia *** preparation utilized the QuEChERS method with acetonitrile:1% aqueous acetic acid(9:1,v/v)as extraction solvent followed by sample clean-up by dispersive solid phase extraction using primary secondary amine sorbent and graphitized carbon *** were then analysed by gas chromatography coupled with electron impact mass spectrometry in the selected ion monitoring *** of detection(LOD)and limit of quantitation(LOQ)values were in the ranges 0.5-50 ng/g and 1-100 ng/g,*** recoveries of the 39 pesticides were in the range 75-112% with precision(as relative standard deviation,RSD)<15%.The results show that the modified QuEChERS method allows rapid and sensitive analysis of multiple pesticide residues in Chinese materia medica.

关键词： Chinese materia medica Gas chromatographymass spectrometry Pesticide residues QuEChERS method

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退役动力电池中磷酸铁锂的回收再生研究进展

稀有金属 2022年第2期46卷 254-264页

作者：柏祥涛胡易琛庄卫东国联汽车动力电池研究院有限责任公司北京101407 北京有色金属研究总院北京100088

随着新能源汽车产业的持续发展,动力电池将会逐步达到寿命周期而退役,首先退役的主要是早期投入市场的磷酸铁锂电池。对磷酸铁锂正极材料的回收可分为资源化回收和再生回收两种,围绕这两个方向科学家开展了大量的研究。本文首先对Li,Fe... 详细信息

随着新能源汽车产业的持续发展,动力电池将会逐步达到寿命周期而退役,首先退役的主要是早期投入市场的磷酸铁锂电池。对磷酸铁锂正极材料的回收可分为资源化回收和再生回收两种,围绕这两个方向科学家开展了大量的研究。本文首先对Li,Fe的资源化回收进行总结,从回收体系对回收效率影响的角度对文献进行分析,并指出了资源化回收存在的不足。研究显示,磷酸铁锂晶体结构十分稳定,通过简单热处理即能修复其失效结构。因此,本文对磷酸铁锂材料的修复再生技术研究进展进行了详细总结,主要从直接再生、补锂再生、提纯得到磷酸铁后再生等方面进行分析,介绍了各项技术的最新研究进展。此外,本文还介绍了一些新型回收技术,如无毒无害溶剂的使用、混合正极的选择性剥离、生物回收技术等。通过以上对磷酸铁锂材料回收和再生研究进展的系统总结,对退役磷酸铁锂电池回收的未来发展方向做出展望。

关键词：退役动力电池磷酸铁锂再生

Effects of Nucleating Additives on Crystallization and Properties of CaO-B_2O_3-SiO_2 Glass-ceramics

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Journal of Wuhan University of Technology(Materials Science) 2009年第6期24卷 997-1000页

作者：王中俭 Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and Technology

ZrO2, TiO2 and P2O5 were doped in CaO-B2O3-SiO2 glass-ceramics as nucleating additives. Effects of different nucleating additives on the phase separation and crystalline behaviors were investigated by using gradient temperature furnace, DTA and XRD. Then, sintering process of the glass-ceramics was investigated by testing sintering shrinkage, dielectric constant and loss. The experimental results shows that the glass-ceramics doped with nucleating additives represents higher crystallization, with ZrO2 as an exceptional effective dopant to promote the precipitation of wollastonite crystal. Finally, ZrO2 containing glass-ceramics was chosen to study the influence of sintering temperature and soaking time with the help of X-ray diffraction analysis and density measurement. The glass-ceramics can be well consolidated at 850 ℃ for 10 min, with low dielectric constant （5.87） and loss （3.21×10^-4）, which is desirable for LTCC application.

关键词： CaO-B2O3-SiO2 glass-ceramics nucleating additives crystallization sinterability