摘要：
Y4Zn4(SiO4)(5) silicate doped with Eu3+ ions was prepared by the high temperature solid state method. The phase purity of phosphor series (Y4-xEux)Zn-4(SiO4)(5) (0.004 <= x <= 4) was checked by X-ray diffraction. The crystal structure, interatomic distances, and atom coordination numbers of Y4Zn4(SiO4)(5) were determined using x-ray powder diffraction. A study of the luminescent properties of (Y4-xEux)Zn-4(SiO4)(5) was carried out employing photoluminescence excitation and emission spectra and luminescence decay. The occupied sites of Eu3+ ions, relative intensity between magnetic dipole transition and electric dipole transition and the F-7(J) levels splitting by the crystal field were discussed in terms of a low symmetry site of Y3+ ion in the Y4Zn4(SiO4)(5) host lattice. The concentration quenching of Eu3+ luminescence was also investigated from the concentration dependence of the decay time measured for Eu3+ D-5(0) -> F-7(1,2) luminescence.
摘要：
Development of rare-earth-free phosphors is quite significant. It is well known that luminescence of Sn2+ depends strongly on the structure of the host crystal. The emission of Mn2+ is often very weak due to forbidden T-4(1) -> (6)A(1) transition. However, it can be enhanced by means of energy transfer. This work deals with the photoluminescence of calcite- and vaterite-type CaCO3 doped with Sn2+, Mn2+ phosphors. The phosphor particles were prepared via a simple co-precipitation method. The phase purity of the synthesized particles was determined by X-ray powder diffraction. Scanning electron microscopy images were obtained to study the particle morphology. Photoluminescence properties were determined by recording the emission spectra and excitation spectra. Furthermore, the fluorescence lifetimes were recorded to investigate decay and energy transfer behavior of the samples. The emission colors of calcite-CaCO3:Sn2+ and vaterite-CaCO3:Sn2+ are different under 254 nm UV excitation, which is explained by the different coordination environment of Ca2+. For the Sn2+-Mn2+ co-doped samples, the emission intensity of Mn2+ becomes stronger than that of Mn2+ singly doped sample, which is attributed to Sn2+ -> Mn2+ energy transfer. Inokuti-Hirayama model is used to analysis of the involved energy transfer mechanism. The color tone of the samples can be tuned in the visible spectral region through adjusting the Mn2+ doping concentration. Near cold white-light emission can also be achieved in a single host co-doped with Sn2+ and Mn2+. (C) 2019 Elsevier B.V. All rights reserved.
作者机构：
[Gao, Xitao; Han, Jian; Liu, Kaineng] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Han, Jian] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
会议名称：
3rd International Conference on Advanced Engineering Materials and Technology (AEMT 2013)
会议时间：
MAY 11-12, 2013
会议地点：
Zhangjiajie, PEOPLES R CHINA
会议主办单位：
[Han, Jian;Liu, Kaineng;Gao, Xitao] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Mpregnation;Poplar;Resin;Technology factors
摘要：
Aimed to improve the properties of Poplar, this study, taking phenol-formaldehyde resin (PF) and urea-formaldehyde resin (UF) as impregnation resin, probed the effect of the technology factors-vacuum time, solid content of resin, impregnation temperature and time on the impregnation results of Poplar, and the relationship between the resin and the wood was researched through infrared spectrum. The weight percent gain (WPG) of test-pieces increased with vacuum time extending, and WPG of the test-pieces were greatest when the solid content of resin was 30%, and the impregnation temperature was 25-30°C. when the impregnation time extended from 3 h to 9 h, WPG of the test-pieces presented increase trend which wasnt obvious. In this wood impregnated resin, the reaction between the resin and the hydroxy in wood formed ether bond binding, which proved that the resin and the wood occurred the chemical reaction.
摘要：
Through impregnation with UF and PF resin, the modification technology of Poplar was experimented and studied. The study results showed that WPG(weight percent gain) of the test-pieces impregnated with UF and PF resin had less difference. The wood vessels were scarcely filled by resin especially UF resin. Regardless of impregnating with UF or PF resin, the cell lumens near the veneer junctions are basically filled by the resin. But the most of the cell lumens depart farther from the veneer junctions were only filled by PF resin instead of UF resin.
摘要：
Taking water-solubility preservative(ACQ-B) as the agentia, and the liquid medicine concentration (LMC), the forcing time, the liquid medicine temperature(LMT) and the pressure as the test factors, the permo-treatment was processed to the circle bamboo, and the technical conditions of the treatment were compared. The results showed that each factor and the levels in the same factor had all larger differences to the weight increase rate(WGR) of bamboo, and WGR of the specimens in the same level had also larger difference. Through variance, range and trend analysis, the technical condition for anti-decadent of circle bamboo was that LMC was 1.0%, forcing time 15h, LMT 65., pressure 0.24MPa, which proved that the preservative could get best permeating result through repeat test.
作者机构：
[Zou, Yue; Han, Jian] Cent S Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Han, Jian] C;Cent S Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
会议名称：
4th International Conference on Technology of Architecture and Structure (ICTAS 2011)
会议时间：
SEP 22-24, 2011
会议地点：
Xian Univ Architecture & Technol, Xian, PEOPLES R CHINA
会议主办单位：
Xian Univ Architecture & Technol
会议论文集名称：
Advanced Materials Research
关键词：
Bamboo plywood;Bending;Mechanical property;Middle temperature PF resine
摘要：
The bending mechanical properties of bamboo plywood which was glued with phenol formaldehyde (PF) resine were detected and analysised. The study results showed that the differences of the bending strength (MOR)and the elastic modulus(MOE) of bamboo plywood prepared separately within 110-130 degrees C were not large, and MOR and MOE exceeded all the targets ruled by JB/T 156-2004. It was proved that the property of this kind of middle temperature PF resine was very well for using in bamboo plywood. When the load was the same, the differences of the deflection, the stress of the bamboo plywood prepared on the different hot-pressing temperature were very small too, but some differences existed in the those strains, and the strains on the lower sursurface of the boards were larger than those on upper surface. When the load was smaller, The deflection, stress and strain of the boards linearly changed with the load increase, which proved that the bamboo plywood mainly produced elastic deformation under this circumstances.
作者机构：
[Dan Luo; Jian Han] College of Material Science and Technology, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
通讯机构：
[Han, J.] C;College of Material Science and Technology, , Changsha 410004, Hunan, China
会议名称：
2012 International Mechanical Properties and Structural Materials Conference(IMPSMC2012)(2012机械性能与结构材料国际会议)
会议时间：
2012-08-17
会议地点：
太原
会议论文集名称：
2012 International Mechanical Properties and Structural Materials Conference(IMPSMC2012)(2012机械性能与结构材料国际会议)论文集
作者机构：
[Zou, Yue; Han, Jian] Cent S Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Han, Jian] C;Cent S Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
会议名称：
International Conference on Materials and Products Manufacturing Technology (ICMPMT 2011)
会议时间：
OCT 28-30, 2011
会议地点：
Chengdu, PEOPLES R CHINA
会议主办单位：
[Han, Jian;Zou, Yue] Cent S Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Bamboo mat;Particle board;Physical and mechnical properties;Strengthen
摘要：
The main physical and mechanical properties of the ordinary and bamboo mat enhancing bamboo particle board (for short EBPB) were detected and analysed through the Resistance Strain Monitor and wood mechnical test machine. The results proved that the tensile and bend deformation of two kinds of bamboo partical board(for short BPB) increased nonlinearly with the load increasing. The greatest tensile and bend load increased respectively 66% and 56%, and in the tensile and bend deformations, decreased respectively 21% and 20% EBPB than the ordimary bamboo particle board(for short OBPB). The main physical and mechnical properties of the EBPB exceeded markedly OBPB, which showed the bamboo mat could increased evidently the physical and mechnical properties of BPB.
