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各位大侠们行行好帮帮忙吧~~~小妹感激不尽啊！！！ 英译汉（2段） 1. A chiral zinc borate Zn2(OH)BO3, which exhibits nonlinear optical, photoluminescent and photoelectronic properties, has been successfully prepared through a hydrothermal reaction. The structure of the compound has a ZnO matrix and the electronic structure of the compound can be regarded as that for ZnO modified by the presence of B atoms. The luminescence properties of Zn2(OH)BO3 were characterized by excitation and emission spectra. Photovoltage signals were observed for the as-synthesized compound and for samples calcined at various temperatures by surface photovoltage spectroscopy (SPS) and field-induced surface photovoltage spectroscopy (FISPS). The results show that Zn2(OH)BO3 has photoelectric transformation ability. Either thermal treatment or application of an external electric field enhances the photovoltage responses of the compound to a considerable extent. 2 A highly intense green-emitting phosphor BaY2Si2Al2O2N5 : Eu2+ (BYN : Eu2+) peaking at 511 nm was synthesized by a solid state reaction. The structure refinement, luminescence properties of BYN : Eu2+ phosphors as well as their thermal quenching and the fabrication of white-light-emitting diodes (W-LEDs) were firstly investigated. By partially substituting Ba by Sr, namely (Ba,Sr) Y2Si2Al2O2N5 : Eu2+ (BSYN : Eu2+), the emission peak was shifted to 565 nm, giving a yelloworange color, due to the splitting of the 5d energy level. By utilizing a mixture of blue-emitting BaMgAl10O17 : Eu2+, green-emitting BYN : Eu2+ and red-emitting CaAlSiN3 : Eu2+ phosphors as light converters, an intense white GaN-based n-UV-LED (380 nm) was fabricated to a exhibit good color-rendering index Ra of 84.5 at a correlated color temperature of 5089 K and CIE coordinates of (0.3425, 0.3478). Based on these results, we are currently evaluating the potential application of BYN : Eu2+ as a green-emitting near-UV convertible phosphor. 汉译英（2段） 1. 合成了高效发射UV 光的CaSiO3 : Pr3 + 新型荧光体,研究了室温下Pr3 + 的4 f 5 d 态的发射和激发光谱, Pr3 + 的4 f 5 d 态的最低子能级向4 f 2 组态的3 H4 ,3 H6 和1 G4 能级跃迁产生UV 发射,并不伴随有4 f--4 f 能级跃迁的可见光发射。Pr3 + 的浓度猝灭是由于辐射和无辐射能量传递造成的,同时,在CaSiO3 中,存在Pr3 +→Gd3 + 的能量传递,探讨了其能量传递特性。 2. 用固相法制备化合物CaY1 - xBO4∶xEu , 研究Eu3 +在CaYBO4 中的取代格位和发光特性。当Eu3 + 掺杂浓度不大时, 存在两个发光中心,认为是取代基质中有两个Y格位的结果; 通过对Eu-O 的电荷迁移激发带位置的分析, 表明Eu3 + 所处八面体中心格位的对称性越低, Eu-O的电荷迁移带越偏向于短波; 当Eu3 + 的掺杂浓度较大( x > 0110) 时, Eu3 + 离子也可占据Ca2 + 格位, 同时Eu3 +还原成Eu2 + 。 谁能给提供一篇关于环境类的专业论文格式的英文科技论文，800字左右（期末考试用PS：本人在职研究生，英语又烂，实在是没办法啦~跪求啊！！！！！） [ Last edited by guoyujiao on 2012-12-30 at 11:36 ] |
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