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Spectral properties and Judd-Ofelt analysis of novel red phosphors Gd_(2)InSbO_(7):Eu^(3+)with high color purity for white LEDs

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Journal of Rare Earths 2021年第11期39卷 1327-1335,I0001页

作者： yu wang Baokui Zhao Bin Deng Shanshan Chen yuanyuan Liu a Guodong wang Ruijin yu College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China College of Science Northwest A&F UniversityYangling 712100China College of Chemistry&Biology and Environmental Engineering Xiangnan UniversityChenzhou 423043China Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application Chenzhou 423043China

Gd_(2)InSbO_(7):Eu^(3+)red phosphors we re successfully synthesized via high-temperature solid-state reactio *** phase purity,particle size,and luminescence properties of obtained phosphors were measured and analyzed in *** Gd_(2)InSbO_(7)lattice possesses cubic structure with F_(d-3 m)(227)space *** phosphors emit bright red emission at 628 nm under 393 nm excitation,and this phenomenon is attributed to the^(5)D0-^(7)F_(2)*** Judd-Ofelt parameters(Ω_(2),Ω_(4)),transition ratio,and branching ratios(β)of Eu^(3+)-doped Gd_(2)InSbO_(7)phosphor were calculated on the basis of the emission spectra and decay *** optimal content in Gd_(2)InSbO_(7):xEu^(3+)is identified to be 15 mol%.The thermal quenching of Gd_(2)InSbO_(7):Eu^(3+)is found to be over 500 K,and its activation energy is 0.26 *** Commission Internationale de l’Eclairage(CIE)chromaticity coordinates of Gd_(2)InSbO_(7):15%Eu^(3+)are(0.629,0.371),which are close to ideal red chromaticity coordinates(0.670,0.330).The fabricated w-LED exhibits good color rendering index(Ra)(86),correlated color temperature(CCT)(6997 K),and CIE chromaticity coordinates(0.302,0.330).The obtained results demonstrate that Gd_(2)InSbO_(7):Eu^(3+)phosphors have potential applications in white LEDs.

关键词： Luminescence Phosphor Antimonate Gd_(2)InSbO_(7) Rare earths

The fundamental plane relation of early-type galaxies:environmental dependence

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Research in Astronomy and Astrophysics 2015年第5期15卷 651-662页

作者： Lei Hou yu wang Department of Astronomy University of Science and Technology of China

Using a sample of 70 793 early-type galaxies from SDSS DR7, we study the environmental dependence of the fundamental plane relation. With the help of the galaxy group catalog based on SDSS DR7, we calculate the fundamental planes in different dark matter halo mass bins for both central and satellite galaxies. We find the environmental dependence of the fundamental plane coefficients is similar in the g, r, i and z bands. The environmental dependence for central and satellite galaxies is significantly different. Although the fundamental plane coefficients for centrals vary systematically with the halo mass, those of satellites are similar in different halo mass bins. The discrepancy between centrals and satellites is significant in small halos, but negligible in the largest halo mass bins. These results remain the same when we only keep red galaxies, or galaxies with b/a 〉 0.6, or galaxies in a specific radius range in the sample. After the correction for the sky background, the results are still similar. We suggest that the different environmental effects of the halo mass on centrals and satellites may arise from their different quenching processes.

关键词： galaxies elliptical and lenticular -- galaxies halo -- galaxies statistics

Electrochemical characterization of AlPO_(4) coated LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2) cathode materials for high temperature lithium battery application

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Rare Metals 2021年第1期40卷 78-83页

作者： Jian-Hua wang yu wang yu-Zhong Guo Chang-Wei Liu Lu-Lu Dan Research Center for Analysis and Measure Kunming University of Science and TechnologyKunming 650093China School of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Aluminum phosphate(AlPO_(4))was used to modify the surface of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(NCM)cathode *** surface structure and electrochemical properties of the coated materials were investigated by X-ray photoelectron spectroscopy(XPS)and electrochemical impedance spectroscopy(EIS).The results confirm the formation of aluminum-containing solid solution on the surface of NCM *** aluminum phosphate coating blocks the Li+insertion-extraction process in cells charged at high rates at room temperature,increasing surface film resistance and decreasing discharge ***,an aluminum phosphate aids the formation of a stable solid electrolyte interface film on NCM surface and stabilizes the Rct of cell as samples electrochemically cycled at 55℃.The electrochemical studies suggest that the initial columbic efficiency is significantly *** NCM sample coated with 1.0 wt%AlPO_(4) delivers a higher discharge capacity and shows excellent capacity retention ability.

关键词： Surface Lithium battery Electrochemical

Nitrous oxide reductase gene (nosZ) and N_2O reduction along the littoral gradient of a eutrophic freshwater lake

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Journal of Environmental Sciences 2013年第1期25卷 44-52页

作者： Chaoxu wang Guibing Zhu yu wang Shanyun wang Chengqing Yin State Key Laboratory of Environmental Aquatic Quality Research Center for Eco-Environmental SciencesChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Lake littoral zones are characterized by heterogeneity in the biogeochemistry of nutrient elements. This study aimed to explore the relationship between the nitrous oxide reductase gene （nosZ）-encoding denitrifier community composition/abundance and N2O reduction. Five samples （deep sediment, near-transition sediment, transition site, near-transition land and land soil） were collected along a littoral gradient of eutrophic Baiyangdian Lake, North China. To investigate the relationship between the nosZ-encoding denitrifier community structure and N20 reduction, the nosZ-encoding denitrifier community composition/abundance, potential denitrification rate （DNR） and potential N20 production rate （pN20） were investigated using molecular biological technologies and laboratory incubation experiments. The results showed that the average DNR of sediments was about 25 times higher than that of land soils, reaching 282.5 nmol N/（g dry weight （dw）.hr） and that the average pN20 of sediments was about 3.5 times higher than that of land soils, reaching 15.7 nmol N/（g dw-hr）. In the land area, the nosZ gene abundance showed a negative correlation with the N20/（N20＋N2） ratio, indicating that nosZ gene abundance dominated N20 reduction both in the surface soils of the land area and in the soil core of the transition site. Phylogenetic analysis showed that all the nosZ sequences recovered from sediment clustered closely with the isolates Azospirillum largimobile and Azospirillum irakense affiliated to Rhodospirillaceae in alpha-Proteobacteria, while about 92.3% （12/13） of the nosZ sequences recovered from land soil affiliated to Rhizobiaceae and Bradyrhizobiaceae in a-Proteobacteria. The community composition of nosZ gene-encoding denitrifiers appeared to be coupled with N20 reduction along the littoral gradient.

关键词： littoral gradient N2O reduction nosZ gene abundance community composition

Transcriptomic analysis reveals essential microRNAs after peripheral nerve injury

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Neural Regeneration Research 2021年第9期16卷 1865-1870页

作者： yu wang Shu wang Jiang-Hong He Key Laboratory for Neuroregeneration of Jiangsu Province and Ministry of Education Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina

Studies have shown that microRNAs(miRNAs) mediate posttranscriptional regulation of target genes and participate in various physiological and pathological processes, including peripheral nerve injury. However, it is hard to select key miRNAs with essential biological functions among a large number of differentially expressed miRNAs. Previously, we collected injured sciatic nerve stumps at multiple time points after nerve crush injury, examined gene changes at different stages(acute, sub-acute, and post-acute), and obtained mRNA expression profiles. Here, we jointly analyzed mRNAs and miRNAs, and investigated upstream miRNAs of differentially expressed mRNAs using Ingenuity Pathway Analysis bioinformatic software. A total of 31, 42, 30, and 23 upstream miRNAs were identified at 1, 4, 7, and 14 days after rat sciatic nerve injury, respectively. Temporal expression patterns and biological involvement of commonly involved upstream miRNAs(miR-21, let-7, miR-223, miR-10 b, miR-132, miR-15 b, miR-127, miR-29 a, miR-29 b, and miR-9) were then determined at multiple time points. Expression levels of miR-21, miR-132, miR-29 a, and miR-29 b were robustly increased after sciatic nerve injury. Biological processes involving these miRNAs include multicellular organismal response to stress, positive regulation of the epidermal growth factor receptor signaling pathway, negative regulation of epithelial cell differentiation, and regulation of myocardial tissue growth. Moreover, we constructed mechanistic networks of let-7, miR-21, and miR-223, the most significantly involved upstream miRNAs. Our findings reveal that multiple upstream miRNAs(i.e., let-7, miR-21, and miR-223) were associated with gene expression changes in rat sciatic nerve stumps after nerve injury, and these miRNAs play an important role in peripheral nerve regeneration. This study was approved by the Experimental Animal Ethics Committee of Jiangsu Province of China(approval No. 20190303-18) on March 3, 2019.

关键词： bioinformatic analysis Ingenuity Pathway Analysis mechanistic network microRNA peripheral nerve injury peripheral nerve regeneration RNA sequencing sciatic nerve crush

A generalization of Banach's lemma and its applications to perturbations of bounded linear operators

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Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 363-369页

作者： wang Zi DING Jiu wang yu-wen School of Mathematics Sciences Harbin Normal UniversityHarbin 150025China School of Mathematics and Natural Sciences The University of Southern MississippiHattiesburg MS 39406-5043USA Academic Committee Harbin Institute of PetroleumHarbin 150027China

Let X be a Banach space and let P:X→X be a bounded linear *** an algebraic inequality on the spectrum of P,we give a new sufficient condition that guarantees the existence of(I-P)^(-1) as a bounded linear operator on X,and a bound on its spectral radius is also *** generalizes the classic Banach *** apply the result to the perturbation analysis of general bounded linear operators on X with commutative perturbations.

关键词： Banach lemma spectral radius generalized inverse perturbation analysis

Tumor microenvironment and immune evasion in head and neck squamous cell carcinoma

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International Journal of Oral Science 2021年第3期13卷 219-229页

作者： Areeg Elmusrati Justin wang Cun-yu wang Laboratory of Molecular Signaling Division of Oral Biology and MedicineSchool of DentistryUCLALos AngelesCAUSA Jonsson Comprehensive Cancer Center UCLALos AngelesCAUSA

Head and neck squamous cell carcinoma(HNSCC),an aggressive malignancy,is characterized by high morbidity and low survival rates with limited therapeutic options outside of regional surgery,conventional cytotoxic chemotherapy,and *** studies have supported the synergistic role of the tumor microenvironment(TME)in cancer *** immune system,in particular,plays a key role in surveillance against the initiation,development,and progression of *** understanding of how neoplastic cells evolve and evade the immune system whether through self-immunogenicity manipulation,or expression of immunosuppressive mediators,provides the foundation for the development of advanced ***,the crosstalk between cancer cells and the host immune system have a detrimental effect on the TME promoting angiogenesis,proliferation,and *** review provides a recent insight into the role of the key inflammatory cells infiltrating the TME,with a focus on reviewing immunological principles related to HNSCC,as cancer immunosurveillance and immune escape,including a brief overview of current immunotherapeutic strategies and ongoing clinical trials.

关键词： squamous chemotherapy outside

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From bulk, single-cell to spatial RNA sequencing

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International Journal of Oral Science 2021年第4期13卷 339-344页

作者： Xinmin Li Cun-yu wang UCLA Technology Center for Genomics&Bioinformatics Department of Pathology and Laboratory MedicineDavid Geffen School of MedicineUCLALos AngelesCAUSA Laboratory of Molecular Signaling Division of Oral Biology and MedicineSchool of Dentistry and Jonsson Comprehensive Cancer CenterUCLALos AngelesCAUSA Department of Bioengineering Henry Samueli School of Engineering and Applied ScienceUCLALos AngelesCAUSA

RNA sequencing(RNAseq)can reveal gene fusions,splicing variants,mutations/indels in addition to differential gene expression,thus providing a more complete genetic picture than DNA *** most widely used technology in genomics tool box has evolved from classic bulk RNA sequencing(RNAseq),popular single cell RNA sequencing(scRNAseq)to newly emerged spatial RNA sequencing(spRNAseq).Bulk RNAseq studies average global gene expression,scRNAseq investigates single cell RNA biology up to 20,000 individual cells simultaneously,while spRNAseq has ability to dissect RNA activities spatially,representing next generation of RNA *** article highlights these technologies,characteristic features and suitable applications in precision oncology.

关键词： representing RNAseq spatially

Self-nucleation of Patterned Polymer Thin Films Defined by Soft Lithography

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Chinese Journal of Polymer Science 2022年第6期40卷 651-657页

作者： Ze-Qian wang Yi-Meng wang Xing-yu wang Bing-Hua wang Jing-Bo Chen Chang-yu Shen Bin Zhang School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 450002China

The nucleation of crystals is often a determining step in the phase transition of materials,but it remains a challenge to control the density and specific location of nuclei *** we fabricated the isolated single crystals of uniform size with controlled number density and spatial distribution by self-nucleation of patterned dendritic *** lithography creates the periodic void space on the surface of poly(ethylene oxide)-b-poly(2-vinyl pyridine)(PEO-b-P2VP)block copolymer thin films and provides spatial redistribution of polymers,leading to the preferential nucleation and subsequent oriented growth of dendrites in the periodic arrays of imprinted *** morphology and thermal stability of the patterned crystals can be adjusted by tuning embossing conditions(e.g.,temperature and pressure).Furthermore,in the self-nucleation technique,the annealing temperature and heating rate are used as the feedback parameters to map the number density and spatial distribution of regrown single *** PEO-b-P2VP crystalline pattern can be used as a versatile template for large-area manufacturing of selective metal patterns for electronic devices and other applications.

关键词： Self-nucleation Imprint lithography Atomic force microscopy Crystallization pattern Selective metal pattern