Raman spectra of undoped and uranium doped CaF2 single crystals

Raman scattering experiments for nominally pure and uranium doped CaF2 single crystals were presented. In all crystals, the Raman active T_(2g) vibration mode of CaF2 was observed, whose frequency shift and full-width at half-maximum (FWHM) broadening correspond well with defects and impurities in CaF2 lattice. Additional Raman peaks develop in nominally pure CaF2 with high etch pits density and U^(6+):CaF2 crystals. Part of additional Raman peaks in the experimental results, which are assumed due to vibration modes from F- interstitials and vacancies, are in well agreement with the theoretical predications by employing the Green-function formulation.

Low temperature growth of c-axis oriented AlN films on gamma-LiAlO2 by radio frequency magnetron sputtering

Aluminum nitride (AlN) films were prepared on gamma-LiAlO2 substrates by radio frequency (rf) magnetron sputtering. The influence of substrate temperature (T-s) and nitrogen (N-2) concentration on film growth was investigated. The X-ray diffraction (XRD) results reveal that highly c-axis oriented AlN films can be obtained in the temperature range from room temperature (RT) to 300 degrees C. A smoother surface and a crystalline quality decrease with increasing N-2 concentration have been observed by XRD and atomic force microscopy (AFM) for the films deposited at lower substrate temperature. On the contrary, the degradation of the surface smoothness and the higher crystalline quality can be observed for the films deposited at a higher substrate temperature with N-2-rich ambient. The growth mechanism which leads to different crystalline quality of the films is discussed. (C) 2008 Elsevier B.V. All rights reserved.

钛宝石激光器中用优化Gires-Tournois镜产生15fs脉冲

根据飞秒脉冲锁模钛宝石激光器脉冲压缩的要求，介绍了负色散镜补偿色散的基本原理及其特点。详细阐述了优化Gires-Tournois(OG-T)镜的设计过程，并通过计算机优化得到理想设计膜系。采用离子束溅射的方法镀制了优化Gires—Tournois镜。测量了优化Gires-Tournois镜(编号为OGT#1)的透射率和群延迟色散，并与设计值进行了比较，分析了实测值产生偏差的原因，从而对镀膜参量进行了相应的调整，制造了第二批优化Gires—Tournois镜(编号为OGT#2)。将优化Gires—Tourn

Estrategias para una VENTANA eficaz: Forma geométrica del HUECO - Diseño de la VENTANA-UH

V.1. 219 p.; V. 2. 589 p.

Salmonella enterica-ren andui monofasikoen karakterizazio molekularra eta epidemiologikoa

219 p.

博优210的选育、示范与推广

博优210是华南晚籼杂交稻的“高优”组合，1993和1994年通过省区试和大面积试种表证，1995年5月通过广东省品种委员会审定，具国内同类型品种领先水平。其主要技术经济指标：1、米质1级至特2级（达出口标准），精米率75％，正精米率71％；2、两年省区试产量名列第二位和第一位，比对照组合增产1％和2％，大田一般亩产450公斤；高产的552公斤，比主栽组合博优64增产30公斤；3、高抗稻瘟病，中抗白叶枯病，后期较耐低温；4、较早熟，全生育期118天，比主栽组合博优64早2至3天；5、制种容易，一般亩产200公斤。由于综合性状优良，而具有较高的经济效益和社会效益，种1亩博优210可增值219元，另因少施或不施农药，减少环境污染，而具有一定的生态效益。

博优210的选育及相关理论研究

博优210是华南晚籼杂交稻的“高优”组合，1993和1994年通过省区试和大面积试种表证，1995年5月通过广东省品种委员会审定，具国内同类型品种领先水平。其主要技术经济指标：1、米质1级至特2级（达出口标准），精米率75％，正精米率71％；2、两年省区试产量名列第二位和第一位，比对照组合增产1％和2％，大田一般亩产450公斤；高产的552公斤，比主栽组合博优64增产30公斤；3、高抗稻瘟病，中抗白叶枯病，后期较耐低温；4、较早熟，全生育期118天，比主栽组合博优64早2至3天；5、制种容易，一般亩产200公斤。由于综合性状优良，而具有较高的经济效益和社会效益，种1亩博优210可增值219元，另因少施或不施农药，减少环境污染，而具有一定的生态效益。博优210均适宜华南各省晚稻区种植，越南亦大量引进试种。种植面积发展异常迅速，1993年3600亩，1994年10万亩，1995年约90万亩，预计1996年将超过300万亩，行家预测，博优210在“九五”期间必将成为华南晚稻主栽组合。发表在《中国水稻科学》等7篇论文，是杂交稻优质育种和优质高产育种的规律性研究结果，对杂交稻育种具有一定指导意义。成果达国内领先水平。