水中石油类含量对后向散射系数光谱的影响

根据2008年5月和2009年8月在辽宁省盘锦市石油类污染水体配比试验和现场试验获取的光学特性数据及生物化学特性数据,分析了石油类含量和后向散射系数数据的关系.结果表明:河口区的后向散射系数幂律指数遵循随着悬浮物浓度增加而减小的对数变化规律;440～856 nm波长范围内单位后向散射系数在0.006～0.035 m2g-1之间,并且随波长增加而减小;石油类含量对后向散射系数的影响集中反映在石油类单位后向散射系数(单佗石油类含量的后向散射系数)上,石油类单位后向散射系数与石油类含量呈乘幂变化规律,且随波长的增加而减小;石油类含量对后向散射系数幂律指数影响小.     

Direct optical spectral analysis of plotted functions

A simple method is outlined by which the power spectrum of conventionally plotted curves may be evaluated. The method is suitable for single- and multichannel analysis.     

Infrared spectrum of boron chloride (BCl)

The spectrum of the Δv = 1 band of BCl was measured between 828 and 870 cm^?1 with a tunable diode laser. The absorptions of the v = 1-0, 2-1, 3-2, and 4-3 transitions of BCl were observed in both a microwave discharge and a dc discharge through BCl₃. Spectra of ¹¹B³⁵Cl, ¹¹B³⁷Cl, ¹⁰B³⁵Cl, and ¹⁰B³⁷Cl were observed in natural abundance. A set of eight Dunham coefficients was determined by fitting the data for all observed isotopic species with the appropriate reduced mass factors. A BCl bond distance, r_e = 0.1715283(31) nm, was determined which agrees with the value derived from the electronic spectrum of BCl. The band center for the v = 1-0 transition of ¹¹B³⁵Cl is ν₀ = 829.4087(8) cm^?1.     

Beryllium (boron) clustering quest in relativistic multifragmentation (BECQUEREL Project)

A physical program of irradiation of emulsions in beams of relativistic nuclei named the BECQUEREL Project is reviewed. It is destined to study in detail the processes of relativistic fragmentation of light radioactive and stable nuclei. The expected results would make it possible to answer some topical questions concerning the cluster structure of light nuclei. Owing to the best spatial resolution, the nuclear emulsions would enable one to obtain unique and evident results. The most important irradiations will be performed in the secondary beams of He, Be, B, C, and N radioactive nuclei formed on the basis of JINR Nuclotron beams of stable nuclei. We present results on the charged state topology of relativistic fragmentation of the ¹⁰B nucleus at low energy-momentum transfers as the first step of the research.     

Optimization of spectral determination of impurities in high-purity selenium

We carried out a complex of investigations concerned with optimization of the conditions and reduction of the limits of atomic-emission determination of impurities in high-purity selenium. We investigate the possibility that the types of impurities in the references can affect the results of analysis. Scientific-Research Institute of Chemistry at the Nizhnii Novgorod State University, 23/5, Gagarin Ave., N. Novgorod, 603600, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 834–836, November–December, 1997.     

Selection of sample preparation methods for petroleum products for atomic spectral analysis

We have developed a very efficient sample preparation procedure for samples of petroleum products using surfactants to extract copper followed by sonication. In order to plot the calibration curve in atomic absorption and inductively-coupled plasma atomic emission determination of copper, we use copper acetylacetonate, allowing us to make the calibration solutions as close as possible in chemical composition to the analyte samples and to improve the precision and accuracy of the determinations.     

Direct characterization of boron segregation at random and twin grain boundaries

Boron distribution at grain boundaries in hot-deformed nickel is directly characterized by the time-of-flight secondary ion mass spectrometry. The segregations of boron are observed at both the random and twin grain boundaries. Two types of segregations at random grain boundaries are observed. The first type of segregation has a high intensity and small width. Its formation is attributed to the incorporating of dislocations into the moving grain boundaries. The second type of segregation arises from the cooling induced segregation at the dislocations associated with the grain boundaries. The segregation at twin boundary is similar to the second type of segregation at random grain boundaries.     

Development of a spectral method for determining the qualitative characteristics of petroleum products

We carried out investigations to refine the spectrophotometric method of determining the qualitative characteristics of petroleum products. Particular attention was given to the development of an algorithm for processing spectral data which would be stable to changes in the temperature of the sample. We present the results of measurements of 50 reference unleaded gasolines. The uncertainty of the method does not exceed 0.5 oct. units. A. N. Sevchenko Scientific-Research Institute of Applied Physical Problems, 7, Kurchatov Str., 220064, Minsk, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 2, pp. 255–258, March–April, 1999.