High Power One- and Two-Order Cascaded Raman Lasers Based on Home-Made Phosphosilicate Fibre

One- and two-order cascaded Raman fibre lasers are demonstrated by using home-made P-doped Raman fibres.An output power of 2.8 W at 1245 nm with a slope efficiency of 33.4% and an output power of 2.0 W at 1495 nm with a slope efficiency of 23.5% are obtained with the pump source at 1069. 7nm.     

火花熔蚀-电感耦合等离子体光谱法分析地质矿物

火花熔蚀-电感耦合等离子体光谱法(SA-ICP)用于测量锆石中铪-锆比值和锰铁矿瘤中的铈、钴、铁、铅、镍和磷。用信背比和信嗓比的序贯单纯形优化法建立了用于高压火花和氩气ICP系统的六个操作参数。将磨细的样品与铜压成饼,从样品中熔蚀出的分析物和基体元素的原于发射信号的时间相关性给出一种用火花来作选择取样的方法。测量锆石中的铪、锆浓度比的精密度为4%(相对标准偏差)。对于锰铁矿瘤,根据分析线对锰(Ⅱ)257.610纳米线强度比的光谱测量结果达到分析精密度范围为7-14%(相对标准偏差)。分析的准确度用参比物USGS诺得(Nod)P-1的标准物加入法来决定,而与锰浓度的测量无关。     

BNL/AGS10.7A GeV金核诱发作用中核碎裂与粒子产生

研究了在美国BNL/AGS上能量10.7AGeV的¹⁹⁷Au离子诱发核作用,报告了EMU–01国际合作实验关于射弹核碎裂和产生粒子密度等最新实验结果.     

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HT-7中性束诊断电源系统的计算机控制系统由PLC、工控机、逻辑控制和定时单元等组成。对起弧、束流引出等实验进行了研究。在多种参数下,通过调节弧压、进气量等观察了其对弧流的影响。初步实验结果表明,在高压35kV、弧流80A的情况下,束电流可以达到3.6A,引出的中性束流功率可以稳定地达到50kW以上。     

八配位钇(Ⅲ)-反式-1,2-环己二胺四乙酸配合物NH4[Y(trans-CYDTA)(H2O)2]·4.5H2O的合成及分子结构

In this paper, the molecular and crystal structures of the NH₄[Y(trans CYDTA)(H₂O)₂]·4.5 H₂O(trans-CYDTA=trans 1,2-cyclohexanediaminetetraacetic acid) are reported. The crystal data are as follows: Triclinic system, P1space group,a=0.8599(6)nm,b=1.0021(7)nm,c=1.4370(9)nm,α =88.095(13)°,β =75.559(1)°,γ =88.344(12)°,V=1.1981(14)nm³,Z=2, M=708.68,D_c=1.570g· cm^-3, μ =2.506mm^-1 and F(000)=590. The final R₁ and wR₂ are 0.0571 and 0.1350 for 4205 [I >2.0σ (I)] unique reflections and 0.1007 and 0.1615 for all 4981 reflections, respectively. In the title complex, the anion [Y(trans-CYDTA)(H₂O)₂]^- has an eight coordination structure with distorted square antiprism. The trans CYDTA which acts as a hexadentate ligand with four Oatoms and two Natoms and two H₂O molecules directly coordinate to central metal Y(Ⅲ) ion. It can be known that the Y(Ⅲ) ion can form an eight coordinate compound with aminopolycarboxylic acid ligands in addition nine coordination structure.     

土贝母化学成分的研究 Ⅲ.土贝母苷甲的结构

从葫芦科植物假贝母(Bolbostemma paniculatum[Maxim] Franquet)的鳞茎中分得五个苷类化合物:土贝母苷甲(1)、乙、丙、丁和戊.通过对1及其各选择性水解产物的 NMR 分析确定了它的结构,为一新的三萜皂苷.     

FTIR-ATR技术研究聚氨酯类文物保护材料的光降解

Polyurethanes are one kind of relic protection materials commonly used. During artificial photo-ageing, three polyurethanes, HDI-based polyurethane, MDI-based polyurethane and TDI-based polyurethane, have been considered to undergo UV radiation. Photochemical degradation of the polyurethanes has been monitored by means of Fourier transform infrared spectroscopy with attenuated total reflection accessory （FTIR-ATR）. It was proved that the mechanism of the photochemical degradation of polyurethanes might be the scissions of carbamate （urethane） groups and the re-reactions of radical groups formed in the scission reactions. From the experiment results HDI-based polyurethane, an aliphatic diisocyanate, could be considered to be more suitably used as relic protection materials among these three polyurethanes for its ageing products with less color.     

气相色谱法测定农药残留量

气相色谱技术的发展,尤其是高灵敏度,高选择性的电子捕获鉴定器和火焰光度鉴定器的出现,以及耐高温固定相相继出现后,对农药残留物的分析也揭开了新的一页。应用气相色谱测定农药残留量的特点是灵敏度高(ppm-ppb 级),分离效率好,速度快,可以同时测定几种或十几种农药残留物,由于上述这些特点,目前气相色谱已广泛地应用于水体、土壤、蔬菜、谷物、水果、肉类、蛋类、奶类等农药残留量的分析,并且获得了满意的结果。目前正在开展农业学大寨群众运动,各条战线都为普及大寨县而做出新的贡献。农药是农作物不可少的有效杀虫剂,并且它又直接关系到人民群众的身体     

ICP—AES半智能直接测定稀土氧化物

本文报道了一种用ＩＣＰ－ＡＥＳ直接测定稀土氧化物的半智能方法，稀土基体对某一稀土分析谱线的光谱干扰补预先扫描并存于谱图集中，在实际测定中，相应的干扰谱图被调用，参加扣除干扰谱线影响的校正计算。结果表明该法令人满意。