硅铁中Si,Al,Ca,Mn,Cr,P和S元素的X射线荧光光谱分析

叙述了用ＡＲＬ８４８０型Ｘ射线荧光光谱仪测定硅铁中Ｓｉ、Ａｌ、Ｃａ、Ｍｎ、Ｃｒ、Ｐ和Ｓ元素的Ｘ射线荧光光谱分析方法。采用直接粉末压片法制样。分析结果与化学法结果相符。方法快速、准确、经济、简便，精密度很好。通常，结果是令人满意的     

Study by track detectors of the 580-MeV photofission of U,Au, Te,Ag, Se,Cu and Cr

The fission of U, Au, Te, Ag, Se, Cu and Cr induced by photons with a maximum energy of 580 MeV has been investigated using mica and glass track detectors in a sandwich configuration. Cross sections for U, Au, Te and Ag fission have been obtained which are in fair agreement with existing data for charged-particle induced fission, but are substantially lower than previous photofission results, obtained by other authors for Te and Ag targets.     

Circulation,internal wave,intrusion, and transfer of impurities in lake

The results of structural hydrophysical investigations at the Pleshcheyevo Lake are presented. There were at first revealed on the base of the data of direct measurements the distributions of parameters of current velocity and of water composition in lake. The theoretical distribution of current velocity with taken in to account the influence of internal wave, circulation and intrusion was verified. The submerged jet of the river water inflow in lake was discovered. There were obtained the measured and theoretical distributions of the total solids in jet. The quality corresponding between the obtained results and the materials of publications on the influence of currents on the biosphere of lake was established.     

Next-to-leading-order results for five, six, and seven jets in electron-positron annihilation

We present next-to-leading order corrections in the leading color approximation for jet rates in electron-positron annihilation up to seven jets. The results for the two-, three-, and four-jet rates agree with known results. The NLO jet rates have been known previously only up to five jets. The results for the six- and seven-jet rate are new. The results are obtained by a new and efficient method based on subtraction and numerical integration.     

Optical phonon frequencies and damping in AlAs, GaP, GaAs, InP, InAs and InSb studied by oblique incidence infrared spectroscopy

The transverse (TO) and longitudinal (LO) optical phonons in AlAs, GaP, GaAs, InP, InAs and InSb have been measured at room temperature by infrared spectroscopy using an oblique incidence reflectance method. The spectra obtained were then fitted using a novel approach to determine the TO and LO phonon frequencies and damping. The results obtained are found to be more precise than in earlier reflectivity measurements using near-normal angles of incidence and provide information on the damping of both phonons. Apart from the GaAs LO mode, the observed damping parameters are found to be quite different from those predicted by theory. From these results the Lowndes condition governing the relative magnitudes of the TO and LO phonon line widths is found to be violated for all these zincblende semiconductors.     

Symmetry breaking,bifurcations, quasiperiodicity,and chaos due to electric fields in a coupled cell model

A model for the asymmetric coupling of two oscillatory cells is considered. The coupling between the cells is both through diffusional exchange (symmetric) and through the electromigration of ionic reactant species from one cell to the other (asymmetric) in applied electric fields. The kinetics in each cell are the same and based on the Gray-Scott scheme. Without the electric field, only simple, stable dynamics are seen. The effect of the asymmetry (applying electric fields) is to create a wide variety of stable dynamics, multistability, multiperiodic oscillations, quasiperiodicity and chaos being observed, this complexity in response being more prevalent at weaker coupling rates and at weaker field strengths. The results are obtained using a standard dynamical systems continuation program, though asymptotic results are obtained for strong coupling rates and strong electric fields. These are seen to agree well with the numerically determined values in the appropriate parameter regimes. (c) 2002 American Institute of Physics.     

发射光谱法测定二氧化锆中钙、镁、铝、铁、钛、铬、硅

本文介绍厂用碳酸钡作缓冲剂测定二氧化锆中Ｍｇ、Ｆｅ、ＡＩ、Ｃ。、Ｔｉ、Ｈｆ、Ｓｉ杂质元素的发射光谱方法。该方法直接压样于普通电极中，简便、快速。取得了满意的结果。     

Joint reconstruction of the speed of sound,absorption, and flows by the Novikov–Agaltsov functional algorithm

Numerical implementation of the two-dimensional functional-analytical Novikov–Agaltsov algorithm is considered and its possibilities are discussed. This algorithm is intended for reconstructing combined scalar-vector inhomogeneities describing spatial distributions of the speed of sound, absorption, and vector flow field. The results of the numerical simulation of the algorithm in the single- and multifrequency probing modes are presented. The obtained results illustrate an acceptable accuracy and interference resistance of the obtained estimates, which illustrates the application prospects of the algorithm in practical problems of acoustic tomography.     

Beam splitting, combining, and cross coupling through multiple superimposed volume-index gratings

We investigate the diffraction properties of multiple-superimposed index gratings from a vector synthetic viewpoint using coupled wave analysis with Bragg and non-Bragg readout. The vector synthetic gratings consist of two volume-index gratings with different grating wave vectors, which can be obtained in photorefractive materials, in optical fibers or in Bragg cells with two driving acoustic waves. This structure can realize beam splitting, beam combining, and beam cross coupling, etc. Analytic expressions for the diffraction efficiency as well as the amplitude of the waves involved are obtained. The results are presented and discussed.     

Experimental measurements of the compressibility, temperature, and light absorption in dense shock-compressed gaseous deuterium

Experimental data on the shock compression, temperature, and absorptivity of gaseous deuterium with an initial density close to its value in the liquid state were obtained on a spherical explosion shock-wave generator in a pressure range of 80–90 GPa. The obtained results are compared with the existing experimental and theoretical data.     

Elastic scattering of electrons from He, Ne and Ar atoms at 35 keV

The eikonal Born series (EBS) method is applied to the elastic scattering of electrons by He, Ne and Ar atoms at 35 keV. The differential cross-sections are compared with the numerical results obtained by the partial-wave analysis. A simple analytical Dirac-Hartree-Fock-Slater (DHFS) field is used for these atoms. The results are also obtained by Wallace, Das and modified Das method. An oscillatory nature and a strong forward peak in the cross-section are not found at 35 keV. The results are nearer to the experimental data of Coffmann and M. Fink as well as numerical results based on relativistic partial-wave treatment.     

Variational method for radiation transfer in an isotropically scattering, two infinite medium slab lattice

The monoenergetic transport equation with an isotropic scattering is applied to an infinite, two-medium slab lattice. Two coupled integral equations are obtained for the two regions. Numerical results are obtained by using the variational method and compared with the published results.     

Two-electron excitation of calcium, strontium, and barium atoms on exposure to electron impact

The absolute effective excitation cross-sections for the spectral transitions of alkaline-earth atoms under the action of electron impact are determined, which correspond to simultaneous excitation of s²-valence electrons. The results were obtained on a setup with intersecting atomic and electron beams. It is established that the effective cross-sections of one- and two-electron excitation of valence subshells into states with the same effective principal and orbital quantum numbers are equal. The results obtained are compared with the available theoretical data. Institute of Electron Physics, National Academy of Sciences of Ukraine, 21 Universitetskaya St., Uzhgorod, 294016, Ukraine. Translated from Zhurnal Prikladnoi, Spektroskopii, Vol. 65, No. 3, pp. 433–436, May–June, 1998.     

Self-consistent theory of population,ionization and electron distribution

We derive analytical formulae for population of excited levels and degree of ionization of atoms not necessarily restricted to the Maxwellian distribution of the free electrons. The results are obtained from solving Boltzmann's equation with a simplified form of the inelastic collision term. Good agreement with numerical results of other authors is obtained.     

Potts model,Dirac propagator,and conformational statistics of semiflexible polymers

A new discretized version of the Dirac propagator ind space and one time dimensions is obtained with the help of the 2d-state, one-dimensional Potts model. The Euclidean version of this propagator describes all conformational properties of semiflexible polymers. It also describes all properties of fully directed self-avoiding walks. The case of semiflexible copolymers composed of a random sequence of fully flexible and semirigid monomer units is also considered. As a by-product, some new results for disordered one-dimensional Ising and Potts models are obtained. In the case of the Potts model the nontrivial extension of the results to higher dimensions is discussed briefly.     

Symbolic Package for Quantum Groups, Noncommutative Algebras, and Logics

This paper describes packages for symbolic calculations in quantum groups, noncommutative differential geometry, and multivalued logic. The package for quantum groups and the program for logic are written in Mathematica 3.0 and/or 4.0. As an example, some results in the logic obtained using these packages are presented.     

Ionization,recombination, and population of excited levels in hydrogen plasmas

Transition rate equations for atomic hydrogen are solved to obtain coefficients for population of excited levels and for ionization and recombination. The results are based upon more accurate transition rates, cover a wider range of plasma parameters, and are obtained by a more general solution of the rate equations than previously available compilations. Diagnostic applications for laboratory plasmas are discussed.     

Scattering by an infinitely-long bianisotropic cylinder with electrically small, convex cross-section

The electromagnetic scattering response of an infinitely-long cylinder made of a general linear bianisotropic material is obtained using a long-wavelength approximation. The results obtained apply when the cross-sectional linear dimensions of the cylinder are electrically small, the constitutive dyadics are arbitrary and the cross-sectional shape is convex.     

Ionospheric response to the solar eclipse on March 29, 2006

In the present work, results of vertical sensing of the ionosphere at the Klyuchi (Novosibirsk) and Arti (Ekaterinburg) Geophysical Observatories during the solar eclipse on March 29, 2006 are given. The maximum eclipse was observed in Novosibirsk at 11:43 UT; the obscuring phase was 92%. A maximum obscuring phase of 80% was observed at the Arti Georhysical Observatory at 11:32 UT. The results obtained are compared with the analogous data obtained in the preceding and next days as well as with the data of many-year observations on March 28, 29, and 30. The results obtained demonstrate that the eclipse affects most strongly the characteristics of the F layer. The maximum variations of the critical frequency f₀F2 were delayed by about 10 min from the maximum eclipse phase, relaxation started half an hour after the maximum eclipse phase, and the frequency decreased at most by 1.5 MHz. A decrease in the critical frequency of the F1 layer has a greater delay and smaller amplitude. The results obtained are in good agreement with previous measurements. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 68–72, September, 2006.     

ICP-AES法测定松香中铁、铅、铜、锌、铝

本文研究了用ICP－AES法测定松香中的铁、铅、铜、锌、铝的方法，确定了松香中杂质元素同时测定的最佳工作条件，并对实际样品进行了AAS法对比测定，回收率在91％－104％之间，结果令人满意。该方法快速、简便、可靠，适用于出口松香的日常检验。