塞曼石墨炉原子吸收光谱法测定粉尘降尘中痕量锡

以KOH熔样,又以KOH作基体改进剂,研究了测定锡的灰化温度、原子化行为和消除干扰及试样前处理的方法,以KOH熔解的粉尘及降尘样液,特别适用于塞曼石墨炉的测定,背景可完全扣除。方法简便、快速、准确,灵敏度和精度高。相对标准偏差为4.0%,回收牢在96.4～110%范围内。     

Evolution of the Alfvénic correlation in the solar wind

Summary The radial evolution of Alfvénic correlation is such that its value decreases with increasing heliocentric distance. So far this behaviour has been interpreted as an increase in the local production of ?inward? modes interacting destructively with the ?outward? modes. This work, which deals with largescale turbulence, shows that local generation phenomena are not commonly found in the solar wind and that the Alfvénic character of the fluctuations mainly depend on the ?outward? modes alone. The interaction of these modes with density and/or magnetic-field structures convected by the wind causes their destruction and a consequent depletion of the Alfvénic correlation. The same effect would be obtained if ?inward? modes were really present. Our conclusions are that large-scale ?inward? modes are the spectral counterpart of non-propagating field and plasma structures convected by the solar wind and identified as both compression regions and pressure balance structures. Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990.     

Na2SbF5晶体倍频系数的理论计算

本文使用阴离子基团理论计算了Na₂SbF₅晶体的倍频系数,得到d₁₂₃=4.48×10^-10esu,与实验值符合较好。计算结果表明,阴离子基团中孤对电子的存在有利于产生大的倍频效应。本文还分析了Na₂SbF₅晶体倍频系数小的原因:尽管(SbF₅)^2-基团存在孤对电子可以对晶体倍频系数有较大贡献,但孤对电子能级的相对位置对其倍频系数有不利影响,从而导致它的倍频系数d₁₂₃较小。 关键词：     

Characteristic values of the integral equation satisfied by the Mathieu functions and its application to a system with chirality-pair interaction on a one-dimensional lattice

We investigate low-temperature behaviors of a system with chirality-pair interaction on a one-dimensional lattice. In the course of the investigation, we evaluate asymptotic forms of the characteristic values of the integral equation satisfied by the Mathieu functions. It turns out that the low-temperature behavior of correlation length of the chirality-pair correlation function is different from the one for the Ising model of spin ±1 but akin to the one for the Ising model of infinite spin.     

THE NBELC AND NWELC CLASSES OF LIFE DISTRIBUTIONS

ＴＨＥＮＢＥＬＣＡＮＤＮＷＥＬＣＣＬＡＳＳＥＳＯＦＬＩＦＥＤＩＳＴＲＩＢＵＴＩＯＮＳ￥ＣＡＯＪＩＮＨＵＡ；ＷＡＮＧＹＵＥＤＯＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅ，Ｂｅｉｊｉｎ...     

广西农业科研院所科技开发现状、问题和对策研究

全面系统总结分析了广西农业科研院所科技开发现状，归纳出五大主要技术开发类型和目前科技开发存在的７个主要问题；提出了广西农业科研院所科技开发的十大措施与对策．     

On the retrograde condensation of one or two liquids

This contribution discusses the phenomena of retrograde condensation of one or two liquids. It w1 be shown that both phenomena can be well understood. Also the relation of retrograde condensation of one liquid phase with the condensation behavior of natural gas will be discussed. Similarly that of two liquid phases with multiple phase behavior occurring in low temperature reservoir fluids will be pointed out.     

新型全固态铁离子敏感电极研究

采用稀土电极材料六硼化镧制备了一种新的全固态铁离子敏感电极。研究了该敏感电极在常见介质中对Ｆｅ３＋的响应行为。结果表明，该铁离子敏感电极在１．５ｍｏｌ／ＬＨ３ＰＯ４介质中的线性响应范围、检测下限和响应斜率分别为１．０×１０－５～１．０×１０－１ｍｏｌ／ＬＦｅ３＋，６．０×１０－６ｍｏｌ／ＬＦｅ３＋和６０ｍＶ／ｐＣ，且具有较好的选择性。