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Circularly polarized luminescence of agglomerate emitters

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Aggregate 2021年第5期2卷 22-44页

作者： Chong Zhang Si Li xi-yan Dong Shuang-Quan Zang Green Catalysis Center Henan Key Laboratory of Crystalline Molecular Functional MaterialsHenan International Joint Laboratory of Tumor Theranostical Cluster Materialsand College of ChemistryZhengzhou UniversityZhengzhouChina College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuoChina

Circularly polarized luminescence(CPL)originates from the chiral emissive excited *** materials have promising applications in 3D optical displays,encryptions,biological probes,chiral photoelectric devices,and CPL switches,most of which require excellent CPL performances including bright luminescence and high luminescence dissymmetry factor(glum)in the agglomerate *** review systematically summarizes the progress about CPL of aggregate and solid materials,such as organic materials,metal-organic materials(such as coordination polymers,organic-inorganic metal halides,metal clusters,and cluster-assembled materials),the assembled materials by supramolecular interactions,and liquid *** also present the current challenges and a future perspective of chiral emitting agglomerate materials.

关键词： agglomerate emitters aggregate science circularly polarized luminescence CPL measurement method

Shape Controlled Preparation,Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe_2O_3 Nanoparticles

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Chemical Research in Chinese Universities 2012年第4期28卷 567-571页

作者： SI Shu-feng MING Zheng-qiu xiNG Guo-wen yan xi Department of Chemistry Beijing Normal UniversityBeijing 100875P.R.China

α-Fe2O3 nanoparticles doped with various molar fractions of Cr^3＋ were synthesized by a forced hydrolysis route and were characterized by X-ray diffraction（XRD）,scanning electronic microscopy（SEM）,X-ray photoelectron spectroscopy（XPS） and inductive coupled plasma（ICP） *** particles reserve shuttle-like shape in the presence of Cr^3＋.The crystallite sizes of Fe2O3 become smaller with the increased Cr^3＋ concentration in *** responses of Cr doped α-Fe2O3 sensors were studied towards reducing gases such as ethanol,methanol,acetone,gasoline and *** sensors based on these materials have higher sensitivities and rapid response/recovery time to alcohol than to hydrocarbon.

关键词： Gas sensitivity Cr doped α-ironic oxide Forced hydrolysis

The Use of Repeated Measures Analysis of Variance to Study the Effect of Phlegm-Heat Syndrome on Neurological Deficits in Patients with Stroke~

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Chinese Journal of Integrative Medicine 2013年第8期19卷 568-572页

作者： xi-yan xin 辛喜艳 (11087) Ying Gao 高颖 (11087) 11087. Department of Neurology Dongzhimen Hospital Beijing University of Chinese Medicine Beijing 100700 China

Objective： To explore the effect of phlegm-heat syndrome on the degree of neurological deficit and provide some data support for the correct recognition of the relationship between phlegm-heat syndrome and neurological deficits in stroke patients. Methods： Clinical information were collected on 294 patients with acute ischemic stroke （AIS） whose syndrome and National Institute of Health stroke scale （NIHSS） score were checked at baseline （within the first 3-day admission） and at 7, 14, 28, and 90 days after admission to our clinical research centre. We explored the effect of phlegm-heat syndrome on the degree of neurological deficit following stroke by applying a repeated measures analysis of variance. Results： Stroke patients with phlegm-heat syndrome had higher NIHSS score than patients without the syndrome （P〈0.01）, and there appeared to be a decrease in NIHSS score over time in all patients （P〈0.01）. Conduslons： Phlegm-heat syndrome in patients who have suffered stroke has an effect on the degree of neurological deficiency. Disappearance of phlegm-heat syndrome may improve the degree of neurological deficit observed in stroke patients.

关键词： ischemic stroke phlegm-heat syndrome neurological deficiency repeated measures analysis ofvariance

Vapor-and temperature-triggered reversible optical switching for multi-response Cu_(8)cluster supercrystals

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Chinese Chemical Letters 2024年第11期35卷 499-504页

作者： yan Wang Si-Meng Zhai Peng Luo xi-yan Dong Jia-Yin Wang Zhen Han Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials and College of ChemistryZhengzhou UniversityZhengzhou 450001China Key Laboratory for Special Functional Materials of Ministry of Education Henan UniversityKaifeng 475004China College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China

Multi-response metal cluster supercrystal materials,which can simultaneously display various such as color,photoluminescence,changes by bearing only one stimulus,have huge potential as stimuliresponsive intelligent material,but are rarely ***,we report three Cu_(8)cluster supercrystals,Cu_(8)-1,Cu_(8)-2,and Cu_(8)-3,with homologous cluster molecule units[Cu_(8)(PNP)_(3)(EPPTA)_(6)](PF_(6))_(2)but distinct *** supercrystals display brightμs-long photoluminescence with a high quantum yield of up to 26.6%in solid-state at room temperature and aggregation-induced emission(AIE)*** thermal stability and blue-excitable bright yellow emission make Cu_(8)-3 serve as a yellow phosphor for white light-emitting ***,upon being stimulated by solvent vapor and temperature,reversible supercrystal-to-supercrystal transformations can be witnessed accompanied by remarkable color and luminescence *** work not only provides a kind of Cu cluster supercrystal model but also motivates the further development of metal clusters in multi-response materials.

关键词： Copper cluster Supercrystal Photoluminescence Stimuli-response Reversible switching

Two proved cases of treating herpes zoster pain by needling wei

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World Journal of Acupuncture-Moxibustion 2019年第1期29卷 28-30页

作者： xi-yan GAO Jin xiE Ling-yan MENG Third Affiliated Hospital of Henan University of Traditional Chinese Medicine Zhengzhou 450000Henan ProvinceChina

Two cases of herpes zoster neuralgia treated by shallow needling combined with electroacupuncture were introduced. The literature basis and possible mechanisms were discussed.

关键词： Needling wei Herpes zoster neuralgia Herpes zoster post-herpetic neuralgia Electroacupuncture

Metagenomic Analysis of Environmental Samples from Wildlife Rescue Station at Poyang Lake, China

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Biomedical and Environmental Sciences 2023年第7期36卷 595-603页

作者： LIU Jia LI xi yan SONG Wen Tao ZENG xiao Xu LI Hui yanG Lei WANG Da yan National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing 102206China Nanchang Center for disease prevention and control Nanchang 330038JiangxiChina

Objective To improve the understanding of the virome and bacterial microbiome in the wildlife rescue station of Poyang Lake,*** Ten smear samples were collected in March *** sequencing was performed to delineate bacterial and viral *** analysis was performed using the Kraken2 and Bracken methods.A maximum-likelihood tree was constructed based on the RNA-dependent RNA polymerase(RdRp)region of *** We identified 363 bacterial and 6 viral families.A significant difference in microbial and viral abundance was found between samples S01–S09 and *** S01–S09,members of Flavobacteriia and Gammaproteobacteria were the most prevalent,while in S10,the most prevalent bacteria class was *** S01–S09,members of Myoviridae and Herelleviridae were the most prevalent,while the dominant virus family of S10 was *** full genome of the pigeon mesivirus-like virus(NC-BM-233)was recovered from S10 and contained an open reading frame of 8,124 *** showed the best hit to the pigeon mesivirus 2 polyprotein,with 84.10%amino acid *** analysis showed that RdRp clustered into Megrivirus *** This study provides an initial assessment of the bacteria and viruses in the cage-smeared samples,broadens our knowledge of viral and bacterial diversity,and is a way to discover potential pathogens in wild birds .

关键词： Metagenomics Virome Megrivirus B Picornaviridae Poyang Lake Wildlife Rescue Station Wild Bird

Failure evaluation mechanism of cement sheath sealing integrity under casing eccentricity during multistage fracturing

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Petroleum Science 2024年第5期21卷 3428-3445页

作者： yan xi Yu Yao Xue-Li Guo Jun Li Yu-Dong Tian Gong-Hui Liu Beijing University of Technology Beijing100124China CNPC Engineering Technology R&D Company Ltd. Beijing102200China China University of Petroleum-Beijing at Karamay Karamay834000XinjiangChina China University of Petroleum-Beijing Beijing102249China CNPC Daqing Drilling Engineering Corporation Daqing163311HeilongjiangChina

A microannulus(MA) is the primary reason for sustained casing pressure in multi-stage fractured-shale gas wells. However, the effect of the casing eccentricity on the long horizontal section has not been considered. In this study, a full-scale integrity tester for cement sheaths is adopted to measure the cumulative plastic deformation. Numerical models are applied to evaluate the development of the cumulative plastic deformation and quantify the MA width considering casing centralization and eccentricity in the context of multiple loading and unloading cycles. Subsequently, the influences of the eccentricity distance and angle, cement-sheath mechanical variables, and different well depths on the cumulative sheath plastic deformation and sheath MA development are explored. The research results demonstrate that casing eccentricity significantly increases the cumulative sheath plastic deformation compared with that of the casing-centered condition. Consequently, the risk of sealing integrity failure increases. The accumulated plastic deformation increases when the eccentricity distance increases. In contrast, the initial plastic deformation increases as the eccentricity angle increases. However, the cumulative plastic deformation decreases after a specific loading and unloading cycle count. Affected by the coupled influence of the internal casing pressure and fracturing stages, the width of the MA in the horizontal section increased from the toe to the heel, and the casing eccentricity significantly increased the MA width at each stage, thus increasing the risk of gas channeling. Finally, an engineering case is considered to study the influence of casing eccentricity. The results show that cement slurries that form low and high elastic moduli can be applied to form a cement sheath when the fracturing stage is lower or higher than a specific value, respectively. The results of this study offer theoretical references and engineering support for the integrity control of c

关键词： Cement sheath Microannulus Casing eccentricity Numerical simulation

Non-artifact vector P- and S-wave separation for elastic reverse time migration

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Petroleum Science 2022年第6期19卷 2695-2710页

作者： xi-yan Zhou Xu Chang Yi-Bo Wang xiao-Tao Wen Jia-Chun You Chang Sun Key Laboratory of Earth Exploration and Information Techniques Chengdu University of TechnologyChengdu610059SichuanChina College of Geophysics Chengdu University of TechnologyChengdu610059SichuanChina Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Key Laboratory of Petroleum Resource Research Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China

Elastic reverse time migration(RTM)uses the elastic wave equation to extrapolate multicomponent seismic data to the subsurface and separate the elastic wavefield into P-and S-waves.P-and S-wave separation is a necessary step in elastic RTM to avoid crosstalk between coupled ***,the current curl-divergence operator-based separation method has a polarity reversal problem in PS imaging,and vector separation methods often have separation artifacts at the interface,which affects the quality of the imaging *** propose a non-artifact P-and S-wave separation method based on the first-order velocity-strain *** equation is used for wavefield extrapolation and separation in the first-order staggered-grid finite-difference scheme,and the storage and calculation amounts are consistent with the classical first-order velocity-stress *** separation equation does not calculate the partial derivatives of the elastic parameters,and thus,there is no artifact in the separated Pand *** wavefield extrapolation,the dynamic characteristics of the reflected wave undergo some changes,but the transmitted wavefield is accurate;therefore,it does not affect the dynamic characteristics of the final migration *** numerical examples of 2 D simple models,part SEAM model,BP model,and 3 D 4-layer model,different wavefield separation methods and corresponding elastic RTM imaging results are *** found that the velocity-strain based elastic RTM can image subsurface structures well,without spike artifacts caused by separation artifacts,and without polarity reversal phenomenon of the PS imaging.

关键词： Multicomponent Elastic RTM P-and S-Wave separation Separation artifacts Decoupled velocity-strain equations

Preparation and electrochemical behaviour of Ti/Mn_(2)O_(3)coating anode

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Rare Metals 2023年第7期42卷 2197-2203页

作者： Fa-Ming xie Lin Tian Chuan-Bin Li Xue-Tao Yuan yan-xi Yin GRINM Resources and Environment Tech.Co. LtdBeijing101047China National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals Beijing101047China China General Research Institute for Nonferrous Metals Beijing100088China Beijing Engineering Research Center of Strategic Nonferrous Metals Green Manufacturing Technology Beijing101047China

Owing to the excellent electrocatalytic activity,corrosion resistance and high cell potential of the dimensionally stable anodes(DSA),DSAs have great application potential in metallurgical electrolysis *** this resear... 详细信息

关键词： coating corrosion resistance