低介电高频覆铜板及 半固化片基材研制与开发

随着信息化科学技术的发展，为适应数字化产品对高频特性的技术要求，对CCL基础材料行业提出更高的技术要求.如何科学合理地选用、配伍改性PCB基板材料具有低ε、低tanδ性，并且使ε和tanδ在空气中受温度、湿度影响又小，层压覆铜板又具有良好的电气性能和机械性能，是本课题着重讨论和研究的主要问题.     

民间文化是发展先进文化的民族根基——抢救广西民间文化遗产三丛书总序

民间文化遗产是发展社会主义先进文化的精神资源与民族根基。根据文化部和中国民间文艺家协会保护和抢救民间文化遗产的精神，广西民间文艺家协会策划“民俗志”、“史诗长歌”、“民间文学作品精选”三套丛书。三篇总序，阐明丛书之宗旨，民俗、史诗、长歌与民间文学基本知识，丛书之写作要点。     

论热浸镀锌生产的环境控制

本文所涉及的工艺为批量热浸镀锌的干法工艺,其流程通常为工件脱脂→酸洗除锈→溶剂助镀→热浸镀锌→镀后处理→检验包装.主要污染物为碱类,废酸类 (包括酸性废水,酸雾),溶剂废气等.有些企业镀后采取钝化处埋,可能产生六价铬污染.     

Blue upconversion luminescence in Tm~(3+)/Yb~(3+) co-doped new oxyfluoride tellurite glass

Solid-state blue and green light sources are desirablefor high-density optical storage, color displays, optoelec-tronics, and medical diagnostics[1-4]. Tm3+ is the moststudied in rare-earth ions for blue laser operation basedupon upconversion[5,6]. One approach to improving theluminescence efficiency of Tm3+ is to co-dope it withother rare-earth ions[7]. The choice of host materials is avery important factor to obtain high efficient upconver-sion emission. In this case, the main goal of the c…     

粉煤灰磁化肥肥效与灌水量的互作效应的研究

对田间试验数据进行饱和D-最优设计统计得出，在当季气候条件下，施肥量(X1)和灌水量(X2)对小麦亩产(Y)的回归方程Y=6264．0 384.8X1 414．8X2-616．5X1^2 729．8X2^2 242．2X1X2，最高产量点对应的施肥量和灌水量分别为825kg／hm^2和6000mm；施肥量(X1)和灌水量(X2)对玉米亩产(Y)的回归方程Y=577．8 533．7X1 228．0X2 100．8X1^2-3381X2^2 5．64X1X2，最高产量点对应的施肥量和灌水量分别为1050kg／hm^2和4254．0mm。     

Study on forward stimulated Brillouin scattering in a backward pumped fiber Raman amplifier

Strong multi-order forward stimulated Brillouin scattering (SBS) has been observed in the backward pumped S-band distributed fiber Raman amplifier (FRA) with tunable narrow signal source (less than 100 MHz) when the pump power of FRA reached the SBS threshold. This does not obey the theory that only weak backward SBS lines exist according to the conservation of energy and momentum and the wave vector selected rule. This is because the sound waveguide characteristic weakens the wave vector rule, and the forward transmitted sound waveguide Brillouin scattering lines are generated and amplified in FRA.When the pump power is further increased, 11 orders of SBS lines and comb-like profile are observed. For the excited line, the frequency is 197.2296 THz and the power is 0 dBm. The even order SBS lines are stronger than odd order SBS lines, the power of the 2nd and 4th order SBS lines is 1.75 dBm, which is 16 dB higher than that of the 1st and 3rd order SBS lines. The odd order SBS lines are named BrillouinRayleigh scattering lines.     

利用高次谐波诊断自生磁场

实验在100TW超短超强激光装置上进行。采用OMA谱仪加CCD测量系统，测量2ωo和3ωo谐波谱的精细结构，回推出激光与等离子体相互作用中产生的自生磁场大小，验证通过谐波谱的精细结构推断白生磁场方法的可靠性。