157 resultados para 530.9


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概述了第9届国际等离子体化学会议的论文和活动情况,对这个领域的发展提出了一些看法。

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制备了一种新的Er^3+/Tm^3+/Yb^3+共掺氧卤碲酸盐玻璃。研究了基质玻璃的热稳定性能、Raman光谱和上转换发光。发现:氧卤碲酸盐玻璃具有好的热稳定性能和低的声子能量,在980nmLD激发下,可同时观察到明显的蓝色(476nm)、绿色(530nm和545nm)和红色(656nm)上转换发光。上转换蓝光(476nm)是由于Tm^3+离子1^G4→3^3H6跃迁,上转换的绿光(530nm和545nm)是由于Er^3+离子2^H11/2→4^I15/2和4^S3/2→4^I15/2跃迁,上转换红光(6

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Blue, green and red emissions through frequency upconversion and energy transfer processes in Tm3+/Er3+/Yb3+-codoped oxyhalide tellurite glass under 980 nm excitation are investigated. The intense blue (476 nm), green (530 and 545 nm) and red (656 nm) emissions are simultaneously observed at room temperature. The blue (476 nm) emission was originated from the (1)G(4)->H-3(6) transition of Tm3+. The green (530 and 545 nm), and red (656 nm) upconversion luminescences were identified from the H-2(11/2)->I-4(15/2), S-4(3/2)->I-4(15/2), and F-4(9/2)->I-4(15/2) transitions of Er3+, respectively. The energy transfer processes and possible upconversion mechanisms are evaluated. (C) 2005 Elsevier B.V. All rights reserved.

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本论文研究的创新之处是在高分辨率的地层层序上选定3米X3米的工作剖面,逐层采集标本,定量研究山旺中新世古气候的变化过程。主要有以下新的认识和结论: 植物化石的数量和种类在地层层序上的变化很大。第5层、第6层、第7层、第13层、第15层和第16层的标本丰富,可以进行CLAMP分析。 第5层、第6层和第7层的泥岩中保存有丰富的植物化石,运用荧光显微分析技术可以清晰地观察到泥岩中植物的气孔和表皮细胞形态。 山旺地区中新世年均温(MAT)在9.5℃和11.3℃之间。较热月份平均温度(WMMT)在19.9 ℃和22.4 ℃之间。生长季月数(GSL)为5.9--6.9个月。生长季节平均降水量(MGSP)为860--1770 mm。生长季月平均降水量(MMGSP)为152--253mm,生长季三个连续最湿的月份降水量(3-WET)为530--920mm,三个连续最旱的月份的降水量(3-DRY)为286--687mm。相对湿度(Rel. Hum)在73%以上,高达80%。特殊湿度(q-Specific Humidity)在5.9--6.7之间,热熵值(H-Enthalpy)为298.5--304.5。 气候参数在地层层序上存在变化。CLAMP分析的结论与最近亲缘种分析(NLR)的结论相似。CLAMP分析的年均温比现在山旺的年均温12.5℃低,比同层的线性分析结果低3℃。与海底有孔虫氧同位素的研究结论一致。山东山旺中新世古气候的研究可以作为中中新世全球气候变化研究的一个标尺。

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患儿男,10岁,因"双侧隐睾"就诊.患儿系足月、顺产、5岁时发现头颅大,经医院诊断为脑积水.几岁时做双侧隐睾手术.患儿身高120 cm.头颅发育不规则,颜面不对称,自小严重的智力低下,说话不清.

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Identification of conserved genomic regions within and between different genomes is crucial when studying genome evolution. Here, we described regions of strong synteny conservation between vertebrate deuterostomes (tetrapods and teleosts) and invertebrat