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Highly crystalline Y3Al5O12:Ce3+ phosphor-in-silica glass ceramics for high-power solid-state lighting

Journal of Rare Earths 2024年第11期42卷 2051-2057页

作者： Shisheng Lin Hang Lin Hongyi Yang Pengfei Wang Ping Sui ju xu Yao Cheng Yuansheng Wang Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Xiamen Institute of Rare-earth Materials Haixi InstitutesChinese Academy of Sciences College of Chemistry and Materials Science Fujian Normal University

The pursuit of high-brightness solid-state lighting（SSL） stimulates the development of all-inorganic color converters with high *** is required that the fluorescent material is able to cope with the extreme condition generated from the irradiation of high-power-density excitation *** such,in this work,we developed a new composite color converter,i,e.,Y3Al5O12:Ce3+phosphor-in-silica glass ceramic(YAG:Ce3+PiSGC).Remarkably,the amorphous SiO2matrix spontaneously transforms into tetragonal SiO2crystallites during co-sintering with crystallization fraction reaching up to>90%（almost full ceramization）.The activation energy for crystallization Ecand Avrami index n of amorphous silica oxide are 298.5 kJ/mol and 1.71,indicating the diffusion-controlled glass crystallization *** fabricated prototype high-power phosphor-converted white light-emitting diode（pc-wLED） and phosphor-converted white laser diode（pc-wLD） based on YAG:Ce3+PiSGC show satisfactory photometric/colorimetric *** developed color co nverters have combined merits of environmental protection property,cost-effective manufacturing,good luminescent performance,and easy *** study highlights a new kind of opto-functional composite material and its application as an efficient color converter in high-power solid-state lightings.

关键词： Glass ceramics Laser-driven white light Rare earths White light-emitting diode Y3Al5O12:Ce3+

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Force-driven moisture-mediated CsPbBr_(3)nanocrystallization from amorphous glass

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Science China Materials 2024年第10期67卷 3106-3114页

作者： Peng Gao Hang Lin Pengfei Wang Ming Liu ju xu Yao Cheng Yuansheng Wang State Key Laboratory of Structural Chemistry Key Laboratory of Optoelectronic Materials Chemistry and PhysicsKey Lab Design&Assembly Funct NanostructFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

While the“amorphous to crystalline”transformation process,which has significant potential for application,has been widely studied,the microscopic mechanism on the nanometer scale is not fully *** contrast to common heat-driven phase transformations,the present study demonstrated the force-driven moisture-mediated nanocrystallization of perovskite CsPbBr_(3)precipitated from a glass *** the present case,the breakage of the glass network under shearing force produces high-energy sites to absorb H2O molecules/clusters from ambient moisture,and the hydration process promotes the crystallization *** analysis combined with confocal laser scanning microscopy revealed that the distribution of CsPbBr_(3)nanocrystals almost reproduced that of the localized stress field and clearly reflected the crack propagation *** potential applications of perovskite glass in the optical sensing of force and moisture are also *** findings provide insight into crystal nucleation/growth in glass,as well as understanding the dynamics of crack propagation during the brittle fracture process.

关键词： luminescence glass ceramic crystallization optical materials optical sensing CsPbBr_(3) perovskite

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Effect of ellagitannin metabolites ellagic acid and urolithins A-D on the non-enzymatic glycation of human serum albumin and inhibiting mechanisms

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Food Science and Human Wellness 2024年

作者： Lu Zhang Chun-yan Peng Wen-na Zhou Fei-yan Lu Lin-ju xu Qing-hui Wen Xing Xie Zong-cai Tu National R&D Center of Freshwater Fish Processing， College of Life Science， Jiangxi Normal University State Key Laboratory of Food Science and Resources， Nanchang University

Effect of ellagitannins gut microbiota metabolites ellagic acid (EA) and urolithin A-urolithin D (UroA-UroD) on human serum albumin (HSA) glycation were firstly evaluated in this research. The inhibition mechanisms were investigated by methylglyoxal (MGO) trapping and radical scavenging ability assays， docking studies and Nano LC-Orbitrap-MS/MS technology. Results indicated that the inhibition of urolithins on HSA glycation was highly positive correlated with the number of phenolic hydroxy groups. Addition of UroD and EA could effectively enhance the content of free amino group， suppress dicarbonyl compounds and advanced glycation end-products (AGEs) formation， alleviated tryptophan and protein oxidation， inhibited HSA amyloid-like aggregation. They could also trap MGO and scavenge DPPH· and ABTS·+. Molecular docking indicated that EA and UroA-UroD interact with HSA mainly through hydrogen bound and hydrophobic interaction， among which two or three hydrogen bonds were formed. The number of glycation sites were reduced from 11 to 10， 10， 7， and 10， respectively， when 90 μmol/L of EA， UroA， UroC and UroD were added. However， weak inhibition was observed on UroA and UroB. These findings can provide scientific evidence for the application of ellagitannins-rich foods in alleviating diabetic complications.

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Analysis of SE~τ IR~ω S Epidemic Disease Models with Vertical Transmission in Complex Networks

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Acta Mathematicae Applicatae Sinica 2012年第1期28卷 63-74页

作者： Xia LIU De-ju xu Department of Mathematics Capital Normal UniversityBeijing 100048China

When the role of network topology is taken into consideration, one of the objectives is to understand the possible implications of topological structure on epidemic models. As most real networks can be viewed as complex networks, we propose a new delayed SETIRWS epidemic disease model with vertical transmission in complex networks. By using a delayed ODE system, in a small-world （SW） network we prove that, under the condition R0 ≤ 1, the disease-free equilibrium （DFE） is globally stable. When R0 〉 1, the endemic equilibrium is unique and the disease is uniformly persistent. We further obtain the condition of local stability of endemic equilibrium for R0 〉 1. In a scale-free （SF） network we obtain the condition R1 〉 1 under which the system will be of non-zero stationary prevalence.

关键词： SETIRWS SW network SF network DFE

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Synergistic Action between Jasmonic Acid and Nitric Oxide in Inducing Matrine Accumulation of Sophora flavescens Suspension Cells

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Journal of Integrative Plant Biology 2008年第1期50卷 92-101页

作者： Mao-jun xu ju-Fang Dong Department of Biotechnology Zhejiang Gongshang University Hangzhou 310035 China

Secondary metabolites not only play important ecological roles in plants but also are important pharmaceutical and source compounds for derivative synthesis. Production of plant secondary metabolites is believed to be controlled by the endogenous signal network of plants. However, the molecular basis is still largely unknown. Here we show that matrine production of Sophora flavescens Ait. cells treated with low levels of jasmonic acid （JA） and nitric oxide （NO） is significantly increased although treatment with low concentrations of JA or NO alone has no effects on matrine production, showing that JA and NO may act synergistically in triggering matrine production. Moreover, treatment with NO triggers lipoxygenase （LOX） activity and enhances JA levels of the cells, showing that NO may activate the endogenous JA biosynthesis of S. flavescens cells. External application of JA induces nitric oxide synthase-like activities and stimulates NO generation of S. flavescens cells, which suggests that JA may trigger NO generation of the cells. Thus, the results reveal a mutually amplifying reaction between JA and NO in S. flavescens cells. Furthermore, JA and NO inhibitors suppress not only the mutually amplifying reaction between JA and NO but also the synergistic effects of NO and JA on matrine production. Therefore, the data demonstrate that the synergistic action of JA and NO in inducing matrine production might be due to the mutually amplifying reaction between JA and NO in the cells.

关键词： jasmonic acid nitric oxide matrine Sophora flavescens cells.

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慢性阻塞性肺疾病的黏液高分泌机制及治疗

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中国临床药理学与治疗学 2024年第4期29卷 383-391页

作者：张婷孙嵘杨涌刘伟春袁玉屏居旭王蒨上海市静安区闸北中心医院呼吸与危重症医学科上海200070

气道黏液高分泌是慢性阻塞性肺疾病的重要病理生理和临床表现之一。文献报道,存在慢性气道黏液高分泌的慢阻肺患者急性加重更频繁,肺功能下降更严重,住院和病死率也更高。因此,了解慢性阻塞性肺疾病黏液高分泌的发病机制,寻求有效的治... 详细信息

气道黏液高分泌是慢性阻塞性肺疾病的重要病理生理和临床表现之一。文献报道,存在慢性气道黏液高分泌的慢阻肺患者急性加重更频繁,肺功能下降更严重,住院和病死率也更高。因此,了解慢性阻塞性肺疾病黏液高分泌的发病机制,寻求有效的治疗方法显得尤为关键。本文重点讨论了气道黏液的结构和意义,并重点讲述了慢性阻塞性肺疾病黏液高分泌的机制。此外,本文还总结了慢性气道黏液高分泌的药物和非药物治疗,药物治疗包括传统药物治疗、针对发病机制的一些新的靶向药物治疗及中医药治疗,非药物治疗包括戒烟、物理治疗及支气管镜治疗,希望能为慢阻肺疾病的黏液高分泌的治疗提供新思路与方向。

关键词：慢性气道黏液高分泌慢性阻塞性肺疾病机制治疗

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Structural Characterization and Luminescence Properties of Two 4d-4fLn-Ag Coordination Compounds Based on Dinuclear Lanthanide Clusters

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Chemical Research in Chinese Universities 2014年第2期30卷 194-199页

作者： ZHANG Yu CHEN Lei ju Weiwei xu Yan State Key Laboratory of Materials-oriented Chemical Engineering College of Chemistry and Chemical EngineeringNanjing Tech University Nanjing 210009 P.R.China

Two new compounds,[ErAg（INA）2（C2O4）]·2H2O（1）（HINA=nicotinic acid） and [Tb0.8Y0.2Ag2（IN）4·（H2O）5]·NO3·2H2O（2）（HIN=isonicotinic acid）,based on the {Ln2} building units,have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction,infrared spectroscopy,thermal analysis and powder X-ray diffraction（PXRD）.Single-crystal X-ray diffraction data reveal that both compounds crystallized in the low-symmetry triclinic space group P1-.Compound 1 is a 3D heterometallic coordination framework based on {Er2}clusters,oxalate ligands and bridging [Ag（INA）] linkers,while compound 2 consists of 0D [Tb0.8·Y0.2Ag2（IN）4（H2O）5]2 subunits that give a 3D supramolecular structure through hydrogen bond *** photoluminescent properties of both compounds（1 and 2） were studied.

关键词： 4d-4fLn-Ag coordination compound Doping Hydrothermal synthesis Crystal structure

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Tumor-suppressor effects of chemical functional groups in an in vitro co-culture system

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Frontiers of Materials Science 2014年第2期8卷 136-141页

作者： Su-ju xu Fu-Zhai CUI Xiang-Dong KONG Institute of Biomaterials and Marine Biological Resources College of Life Sciences Zhejiang Sci-Tech University Hangzhou 310018 China Institute of Regenerative Medicine and Biomimetic Materials School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Liver normal cells and cancer cells co-cultured on surfaces modified by different chemical functional groups, including mercapto （-SH）, hydroxyl （-OH） and methyl （-CHz） groups. The results showed that different cells exhibited changes in response to different surfaces. Normal cells on -SH surface exhibited the smallest contact area with mostly rounded morphology, which led to the death of cancer cells, while cancer cells could not grow on -CH3 groups, which also died. In the co-culture system, the -CH3 group exhibited its unique effect that could trigger the death of cancer cells and had no effects on normal cells. Our findings provide useful information on strategies for the design of efficient and safe regenerative medicine materials.

关键词： tumor suppressor chemical functional group co-culture system regen-erative medicine material

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Handover with resource pre-allocation in the OFDMA systems

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 27-31,52页

作者： LI Ming-ju xu Ning WANG Ying ZHANG Ping Key Laboratory of Universal Wireless Communications (Beijing University ofPosts and Telecommunications) Ministry of Education Wireless TechnologyInnovation Institute Beijing 100876. China

This article proposed a new handover algorithm for beyond the third generation （B3G） systems with an orthogonal frequency division multiple access （OFDMA） downlink. In the proposed algorithm, handover mobile termination （MT） chooses a subchannel set in the candidate cells by a subchannel booking rule, based on the terminal speed and the subchannel＇s channel state information （CSI）. Moreover, the handover decision is made after analyzing if at least one candidate cell can reserve the subchannel set for the handover user. Simulation results show that the algorithm reduces the number of handovers and guarantees the quality of service （QoS） for the handover users. It yields better system performance in the OFDMA systems.

关键词： handover OFDMA resource preallocation subchannel booking rule CSI

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Boosting single-band red upconversion luminescence in colloidal NaErF_4 nanocrystals:Effects of doping and inert shell

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Journal of Rare Earths 2019年第6期37卷 573-579页

作者： Xiangshui Cui Yao Cheng Hang Lin Qingping Wu ju xu Yuansheng Wang CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences

Single-band red upconversion luminescence(UCL) is vital to in vivo bioimaging as well as "see and treat" biomedicines. Herein, starting with the previously reported β-NaErF4:Tm UCNPs, we examined the effects of both Yb^(3+) doping and inert shell coating on the red-to-green(R/G) ratio for Er3+ based UCL. The doping of Yb^(3+) into the β-NaErF4:Tm3+ core not only enhances the whole UCL intensity, but also raises the R/G ratio by 1.25 times. In addition, the coating of an inert NaYF4 shell, which is usually adopted for the enhancement of UCL intensity, further boosts the R/G value up to as high as 77.92. This work may benefit the potential bioimaging application of single-band red UCL.

关键词： Yb3+ doping Single-band Upconversion luminescence Core-shell nanostructure Rare earths

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