Hydrothermal synthesis, characterization, and luminescence of Ca2B2O5:RE (RE = Eu3+, Tb3+, Dy3+) nanofibers

Yang, Li,Wan, Yingpeng,Li, Yuze,Pu, Yinfu,Huang, Yanlin,Chen, Cuili,Seo, Hyo Jin Springer-Verlag 2016 JOURNAL OF NANOPARTICLE RESEARCH Vol.18 No.4

<P>Ca2B2O5:RE (RE = Eu3+, Tb3+, Dy3+) nanofibers were synthesized by the hydrothermal reaction method. The structural refinement was conducted on the base of the X-ray powder diffraction (XRD) measurements. The surface properties of the Ca2B2O5:RE (RE = Eu3+, Tb3+, Dy3+) nanofibers were investigated by the measurements such as the scanning electron microscope (SEM), transmission electron microscope (TEM), and the energy dispersive spectrum (EDS). The nanofiber has a diameter of about 100 nm and a length of several micrometers. The luminescence properties such as photoluminescence excitation (PLE) and emission spectra (PL), decay lifetime, color coordinates, and the absolute internal quantum efficiency (QE) were reported. Ca2B2O5:Eu3+ nanofibers show the red luminescence with CIE coordinates of (x = 0.41, y = 0.51) and the luminescence lifetime of 0.63 ms. The luminescence of Ca2B2O5:Tb3+ nanofibers is green color (x = 0.29, y = 0.53) with the lifetime of 2.13 ms. However, Dy3+-doped Ca2B2O5 nanofibers present a singlephase white-color phosphor with the fluorescence decay of 3.05 ms. Upon near-UV excitation, the absolute quantum efficiency is measured to be 65, 35, and 37 % for Eu3+-, Tb3+-, Dy3+-doped Ca2B2O5 nanofibers, respectively. It is suggested that Ca2B2O5:RE (RE = Eu3+, Tb3+, Dy3+) nanofibers could be an efficient phosphor for lighting and display.</P>

Polymorphisms of Ionotropic Glutamate Receptor-Related Genes and the Risk of Autism Spectrum Disorder in a Chinese Population

Xinyan Xie,Fang Hou,Li Li,Yanlin Chen,Lingfei Liu,Xiu Luo1,Huaiting Gu,Xin Li,Jiajia Zhang,Jianhua Gong,Ranran Song 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.5

Objective: To evaluate the association of GRIK2 and NLGN1 with autism spectrum disorder in a Chinese population. Methods: We performed spatio-temporal expression analysis of GRIK2 and NLGN1 in the developing prefrontal cortex, and examined the expression of the genes in ASD cases and healthy controls using the GSE38322 data set. Following, we performed a case-control study in a Chinese population. Results: The analysis using the publicly available expression data showed that GRIK2 and NLGN1 may have a role in the development of human brain and contribute to the risk of ASD. Later genetic analysis in the Chinese population showed that the GRIK2 rs6922753 for the T allele, TC genotype and dominant model played a significant protective role in ASD susceptibility (respectively: OR=0.840, p=0.023; OR=0.802, p=0.038; OR=0.791, p=0.020). The NLGN1 rs9855544 for the G allele and GG genotype played a significant protective role in ASD susceptibility (respectively: OR=0.844, p=0.019; OR=0.717, p=0.022). After adjusting p values, the statistical significance was lost (p>0.05). Conclusion: Our results suggested that GRIK2 rs6922753 and NLGN1 rs9855544 might not confer susceptibility to ASD in the Chinese population.

Sol–Gel Driving LiFe(MoO4)2 Microcrystals: High Capacity and Superior Cycling Stability for Anode Material in Lithium Ion Batteries

Li Wang,Yuanchuan He,Yanlin Mu,Bo Wu,Mengjiao Liu,Yan Zhao,Xin Lai,Jian Bi,Daojiang Gao 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.2

LiFe(MoO 4 ) 2 microcrystals have been fabricated via a facile sol–gel driving process. The obtained LiFe(MoO 4 ) 2 microcrystalsare characterized through X-ray diff raction, thermal analysis, scanning electron microscope, transmission electronmicroscope and high resolution transmission electron microscope. The results demonstrate that the as-synthesized microcrystalspossess triclinic structure and exhibit uniform particle size of 1–2 μm. When served as anode material for lithiumion batteries, LiFe(MoO 4 ) 2 microcrystals display a very high specifi c capacity of 925 mAh g −1 at a current rate of 1 C after500 cycles and a high retention rate of 88%, showing superior electrochemical performance.

Lipid Production by a CO2-Tolerant Green Microalga, Chlorella sp.MRA-1

( Yanlin Zheng ),( Cheng Yuan ),( Junhan Liu ),( Guangrong Hu ),( Fuli Li ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.5

Since CO2 concentrations in industrial flue gases are usually 10%-20%, one of the prerequisites for efficient CO2 removal by algae is the level of tolerance of microalgal species to exposure to high concentrations of CO2. A newly isolated microalgal strain, Chlorella sp. MRA-1, could retain growth with high concentrations of CO2 up to 15%. The highest lipid productivity for Chlorella sp. MRA-1 was 0.118 g/l/day with a 5% CO2 concentration. Octadecenoic acid and hexadecanoic acid, the main components of biodiesel, accounted for 70% of the total fatty acids. A lipid content of 52% of dry cell weight was achieved with limited amounts of nitrogen. Chlorella sp. MRA-1 seems to be an ideal candidate for biodiesel production when cultured with high concentrations of CO2.

The dependence of luminescence on reduction of Sm2+ ions doped in lithium barium borate glasses

Li, Yadong,Huang, Yanlin,Jiang, Chuanfang,Jang, Kiwan Springer-Verlag 2009 APPLIED PHYSICS A MATERIALS SCIENCE AND PROCESSING Vol.97 No.3

Research on Automatic Mapping Method of Geologic Column

Shao YanLin,Shao YaXiong,Xu XiaoHong,He ZhenMing,Li GongQuan 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7

The realization of the digital reservoir can greatly improve the information level of the petroleum corporation in hydrocarbon exploration and development, reduce risk and improve efficiency. Wells are the core object of digital reservoir management. Geologic column of drilling is the main carrier of multi-source information. Automatic mapping method and multi-source information fusion of geologic column have become a research hotspot of digital reservoir construction. This paper describes current situation of the domestic reservoir management and practical problem of geological maps digitizing. The thought and process of geologic column automatic mapping, which are based on spatial information technology, are submitted. The partition of information bar is settled on. The three-tier system architecture of automatic mapping system is established. With the support of XML technology, XSD is used to make the parameter template of geologic column automatic mapping and realize corresponding configuration wizard. UML is used to design the automatic mapping system. The lithological plate and geological symbols is coded to realize automatic mapping of corresponding drawing elements. The drawing methods of logging and petrophysical data are improved and the visualization of curve and numerical stick figure is achieved. The integration method of casting photos, core images and geologic column is submitted. For the secondary development technology of ArcGIS Engine, object-oriented program is adopted to realize automatic mapping of geologic ArcGIS Engine column. This paper provides a new way for the geologic column mapping during the process of digital reservoir construction.

BETCHOV-DA RIOS EQUATION BY NULL CARTAN, PSEUDO NULL AND PARTIALLY NULL CURVE IN MINKOWSKI SPACETIME

Melek Erdogdu,Yanlin Li,Ayse Yavuz 대한수학회 2023 대한수학회보 Vol.60 No.5

The aim of this paper is to investigate Betchov-Da Rios equation by using null Cartan, pseudo null and partially null curve in Minkowski spacetime. Time derivative formulas of frame of $s$ parameter null Cartan, pseudo null and partially null curve are examined, respectively. By using the obtained derivative formulas, new results are given about the solution of Betchov-Da Rios equation. The differential geometric properties of these solutions are obtained with respect to Lorentzian causal character of $s$ parameter curve. For a solution of Betchov-Da Rios equation, it is seen that null Cartan $s$ parameter curves are space curves in three-dimensional Minkowski space. Then all points of the soliton surface are flat points of the surface for null Cartan and partially null curve. Thus, it is seen from the results obtained that there is no surface corresponding to the solution of Betchov-Da Rios equation by using the pseudo null $s$ parameter curve.

Experimental Study on the Penetration of Natural Unsaturated and Collapsible Loess Based on the Permeability Velocity

Xin Wen,Yanlin Jing,Zhiping Hu,Jigang Shao,Jieru Li,Rui Wang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.12

It is of great importance to study the behavior of loess moisture infiltration based on the loess permeability velocity to prevent geological disasters by loess collapsibility and get effective solutions for the problems of practical engineering. In this study, a custom-made permeation device was used to measure the permeation velocity of collapsible loess before and after water immersion and consolidation. The infiltration characteristics of the undisturbed collapsible loess under different consolidation pressures were discussed, and the influence of the pore characteristics on the permeability velocity was analyzed by the mercury injection test. Meanwhile, the correlations of various types of pores on the permeability velocity were studied by the gray relational entropy method to further reveal the water infiltration mechanism in loess. The results showed that the soil is compressed after consolidation and immersion tests, and the pore volume and pore diameter decreases. However, permeability velocity increases rather than decreases, and the self-weight collapsible state has the most significant permeability velocity. To the collapsible loess, the permeability velocity decreases with the increase of soil pore area. Additionally, small pores show the strongest correlation with permeability velocity. The conclusions of this study have a positive role in guiding foundation treatments and slope stability in collapsible loess areas.

Sealing Methods for Anodic Aluminum Oxide Film

Mei Yu,Yanlin Wu,Jian Xiao,Xinyu Li,Songmei Li,Jianhua Liu 한국표면공학회 2023 한국표면공학회 학술발표회 초록집 Vol.2023 No.11-1

Luminescence characteristics and site-occupancy of Eu²⁺- and Eu³⁺-doped MgZn₂(PO₄)₂ phosphors

Xu, Chuanyan,Li, Yadong,Huang, Yanlin,Yu, Young Moon,Seo, Hyo Jin The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.12

<P>Eu<SUP>2+</SUP>- and Eu<SUP>3+</SUP>-doped MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> were prepared using the high temperature solid-state reaction method. The excitation spectra in the UV and VUV region, the emission spectra, and the luminescence decay curves of the Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> ions were investigated. The crystallographic distributions of the Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> lattices are different. MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP> presents a bluish green luminescence with two distinct emission centers at 450 and 525 nm. MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP> presents an reddish orange color with luminescence transitions from the <SUP>5</SUP>D<SUB>0</SUB> level of the Eu<SUP>3+</SUP> ions. There exist two Eu<SUP>2+</SUP>-crystallographic sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP>, which occupy both Mg<SUP>2+</SUP> and Zn<SUP>2+</SUP> sites. However, there is only one Eu<SUP>3+</SUP>-site in the MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP> lattices, which was confirmed by site-selective excitation and emission spectroscopy, and the luminescence decay in the <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>0</SUB> region of the Eu<SUP>3+</SUP> ions under a pulsed, tunable, narrowband dye laser. The Eu<SUP>3+</SUP> ion was suggested to occupy the octahedral Mg<SUP>2+</SUP>-site in the MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> lattices. The spectral characteristics, the temperature-dependent luminescence intensity and activation energies of thermal stabilities and the microstructures were discussed on the basis of the crystal structure and the luminescence results.</P> <P>Graphic Abstract</P><P>Eu<SUP>2+</SUP> ions occupy both Mg<SUP>2+</SUP> and Zn<SUP>2+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP>, and the occupancy on Zn<SUP>2+</SUP> sites is dominant. However, Eu<SUP>3+</SUP> ions are only distributed on the octahedral Mg<SUP>2+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm16352g'> </P>