分光光度法测定荞麦中芦丁含量

建立一种简单、准确测定荞麦中芦丁含量的分光光度法，讨论最佳试验条件及试剂用量，反应产物在５００ｎｍ有相对稳定吸收峰，该法灵敏、可靠（ε＝７．５×１０￣４Ｌ／ｍｏｌ·ｃｍ）。回收率９６．４０％─１０５．５０％，相对标准偏差小于１．４２％。     

分光光度法测定银杏中有机锗

本文用分光光度法测定银杏中的有机锗含量。结果表明，灰化法操作简单、准确，方法回收率为99．24％－100．26％，结果满意。     

阿莫西林-铜络合物光度法测定阿莫西林

本文提出了一种简便,快速,准确测定阿莫西林含量的方法,在Ｎａ２ＣＯ３介质中,阿莫西林与铜离子形成络合物,于３３４ｎｍ处产生最大吸收,测定阿莫西林的线性范围为２－５０ｇ．ｍＬ＾－１本方法用于阿莫西林原料样品的测定结果满意。     

DSPCF分光光度法测定水中微量铜

在醋酸－醋酸钠介质中,铜与ＤＳＰＣＦ形成稳定的紫红色配合的,其最大吸收波长为５８０ｎｍ,表观摩尔吸光系数为４．８×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,显色反应瞬间完成,有色配合物稳定２４ｈ以上,铜量在０－０．８ｍｇ／Ｌ范围内符合比耳定律,用于水样中微量铜的测定,结果满意。     

湿法消化荧光法测定蔬菜中的微量锗

本文研究了蔬菜中微量锗的荧光测定方法，用混酸消化样品，不经萃取分离可用标准加入法测定计算样品的含量。     

铸铁中硅含量与粒度的关系

本文详细讨论了铸铁试样中硅的测定结果与粒度的关系。     

紫外分光光度法测定溴氰菊酯粉剂中溴氰菊酯含量研究

在环己烷介质中,溴氰菊酯在２７８ｎｍ处有特征吸收峰,根据此建立了一种紫外分光光度法测定溴氰菊脂的新方法,方法用于溴氰菊酯粉剂中溴氰菊酯含量的测定,结果满意。     

国内汞测定评述

本文评述了应用化学法、原子荧光法、原子吸收法、色谱法、电化学法、间接法、以及其他方法对Hg的分析。     

三波长分光光度法测定色氨酸,酪氨酸和苯丙氨酸的研究

本文用三波长分光光度法测定色氨酸，酪氨酸和苯丙氨酸，利用计算机选择最佳波长组合，可实现三种组分的同时测定，合成样品的分析结果表明，方法的准确和精密度都令人满意。     

黄芩中锗的分光光度研究

对黄芩中的锗进行了分光光度法研究，结果表明，黄芩中含有丰富的有机锗。本方法简单可靠，可获得满意的分析结果。     

Radionuclides in deposition in the Ignalina NPP region in 2005

Results of radionuclide activity concentration measurements in deposition and ground-level air conducted at the station of the Institute of Physics situated 3.5 km from the Ignalina Nuclear Power Plant (Ignalina NPP) in 2005 are analyzed. Atmospheric depositional fluxes of ⁷Be, ⁶⁰Co and ¹³⁷Cs are estimated. Radionuclide particle deposition rates are calculated. The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model of the global dispersion and deposition is used to explain variations in the ¹³⁷Cs activity concentration in the ground-level air in the Ignalina NPP region in 2005. An increase in the ¹³⁷Cs activity concentration of up to 17.4 μBq m⁻³ on 30 October-5 November is studied. Modelling results show that the Chernobyl NPP Unit 4 Sarcophagus and the radiocaesium resuspension from the Chernobyl NPP accident polluted regions are sources of ¹³⁷Cs to the environment of the Ignalina NPP. Results on solubility in water of aerosols — carriers of ¹³⁷Cs — are discussed.     

Universal scaling in BCS superconductivity in three dimensions in non-s waves

The solutions of a renormalized BCS equation are studied in three space dimensions in s, p and d waves for finite-range separable potentials in the weak to medium coupling region. In the weak-coupling limit, the present BCS model yields a small coherence length and a large critical temperature, , appropriate for some high- materials. The BCS gap, , and specific heat as a function of zero-temperature condensation energy are found to exhibit potential-independent universal scalings. The entropy, specific heat, spin susceptibility and penetration depth as a function of temperature exhibit universal scaling below in p and d waves. Received: 18 July 1997 / Revised: 8 September 1997 / Accepted: 29 September 1997     

Thermal convection in Rivlin-Ericksen elastico-viscous fluid in porous medium in hydromagnetics

The thermal instability of a layer of Rivlin-Ericksen elastico-viscous fluid in porous medium acted on by a uniform magnetic field is considered. For stationary convection, Rivlin-Ericksen elastico-viscous fluid behaves like a Newtonian fluid. The magnetic field is found to have stabilizing effect whereas medium permeability has destabilizing effect. The magnetic field introduces oscillatory modes in the system, A sufficient condition for the non-existence of overstability is also obtained.     

Fano-type features in magnetoabsorption in semiconductors

It is shown that bulk semiconductors exhibit strongly asymmetric Fano-type resonance profiles in magnetoabsorption processes involving the formation of hot electron-hole pairs (EHPs) and accompanied by the scattering of the EHPs by defects. This result is valid for transitions to electronic states with large Landau quantum numbers, when the Coulomb interaction plays a small role. The physical reason for such a sharp change in the magnetoabsorption coefficient as compared with the expected result for the ordinary density of states in a quantizing magnetic field is that the electronic excitations are quasi-one-dimensional. The form of the resonance absorption is in good qualitative agreement with the experimental data. Pis’ma Zh. éksp. Teor. Fiz. 63, No. 8, 619–622 (25 April 1996)     

Uncertainty in prediction and in inference

The concepts of uncertainty in prediction and inference are introduced and illustrated using the diffraction of light as an example. The close relationship between the concepts of uncertainty in inference and resolving power is noted. A general quantitative measure of uncertainty in inference can be obtained by means of the so-called statistical distance between probability distributions. When applied to quantum mechanics, this distance leads to a measure of the distinguishability of quantum states, which essentially is the absolute value of the matrix element between the states. The importance of this result to the quantum mechanical uncertainty principle is noted. The second part of the paper provides a derivation of the statistical distance on the basis of the so-called method of support.     

Supergravity in theory in 11 dimensions

We present the action and transformation laws of supergravity in 11 dimensions which is expected to be closely related to the O(8) theory in 4 dimensions after dimensional reduction.