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通过测量一批不同组成的铌酸钾锂晶体的Raman光谱,分析其晶体中组分离子浓度对晶体红外Raman光谱特征的影响,结果表明,晶体中位于C格位的Li浓度对晶体Raman光谱产生了强烈的影响:低Li含量晶体中[NbO6]^7-八面体所对应的3个Raman特征光谱线没有峰发生分裂,在100-400cm^-1范围出现小峰与C格位Li存在相关;当晶体中Li浓度增加时,与v5所对应的Raman峰在散射几何为X(ZY)Z对应的光谱中有所加宽,v2振动模式在两种散射几何中均出现分裂峰,并在100~400cm^-1范围内出现小峰数量增多;当Li浓度接近晶体化学组成时,微扰进一步加强,v5所对应的Raman峰分裂成3个峰,v1和v2振动模式发生部分分裂,在100~400cm^-1范围内小峰更为突出。 相似文献
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Unlike the corporate sector, detailed estimates of unfunded pension liabilities for most local governments are not available. Thus, prior research on the association between unfunded pension liabilities and municipal creditor decisions (Copeland and Ingram 1983; Marks and Raman 1985) has implicitly assumed that certain pension ratios are good surrogates for municipal pension underfunding. In this paper, we rely on a theoretical model by Ehrenberg (1980) to test empirically the appropriateness of pension ratios as “correlates” of municipal pension underfunding. These ratios were found to be correlated with pension underfunding, although they accounted for only about 30 percent of the variance in the underfunding variable. 相似文献
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基于位移的抗震设计是指在一定水准的设计地震作用下,以预期的结构位移反应为设计目标,从而实现结构在设计地震作用下的预期性能要求。文章简要阐述直接基于位移的抗震设计理论及方法,介绍用该方法对框架结构进行设计的设计过程,并提出了该方法在今后的研究和应用中需要解决的问题。 相似文献
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文章阐述了通过固体同位素质谱仪,采用同位素质谱稀释分析方法(ID—TIMs)和电感耦合等离子体原子发射光谱(ICP—AES),意外地在山西发现钐(Sm)和钕(Nd)元素含量异常的数据,进而与多家单位合作,采用多种现代分析手段精密分析与研究,最终在山西沁源大峪铝土矿和平陆曹川黑灰色黏土岩与铝土岩中发现稀有稀土含量的异常值,该值迭到稀土金属矿床工业指标。 相似文献
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This article examines the association between state regulation of accounting practices and municipal borrowing costs. The results demonstrate that stringent accounting regulations do have an effect on borrowing costs after abstracting the effects of other explanatory variables. The direction of the observed effect is difficult to assess due to presence of multicollinearity in the model. However, lower borrowing costs are suggested by the analysis. 相似文献
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通过双原子分子电子振动光谱的转动结构特点的理论分析,文章给出了双原子分子的电子振动光谱的转动结构的标识和检验方法,并根据共轭斜量法编写程序,由标出的双原子分子的电子振动光谱的转动结构计算分子常数。 相似文献