Journal of Applied Spectroscopy (J Appl Spectros )

Publisher: Springer Verlag


Journal of Applied Spectroscopy (JAS) is the translation of an important publication that reports on many key applications of spectroscopy in chemistry physics metallurgy and biology. An increasing number of papers focus on the theory of lasers as well as the tremendous potential for the practical applications of lasers in numerous fields and industries. The Russian volume-year is published in English beginning in July

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    Journal of Applied Spectroscopy website
  • Other titles
    Journal of applied spectroscopy (Online), Journal of applied spectroscopy
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    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

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Springer Verlag

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The ultra-dispersive powders of alumolutetium garnets activated by Ce 3+ ions have been obtained by colloid chemical approach. Those spectral luminescence properties and crystal structure as function of activator concen tration and temperature treatment of precursor have been studied by means of optical spectroscopy, X-ray and neutron diffraction. The changes in structure parameters of these compounds depends on synthesis conditions and, as result, the distortion in crystal environmental of Се 3+ ions change luminescence intensity of those com- pounds. It was found that maximum of luminescence intensity for this compounds have been observed at activator concentration of 1.0 wt.% and at annealing temperature region of 1200—1300°С.
    Journal of Applied Spectroscopy 11/2014; 81(6):958.
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    ABSTRACT: One aerobic and four anaerobic batch fermentations of the yeast Saccharomyces cerevisiae were conducted in a stirred bioreactor and monitored inline by NIR spectroscopy and a transfl ectance dip probe. From the acquired NIR spectra, chemometric partial least squares regression (PLSR) models for predicting biomass, glucose and ethanol were constructed. The spectra were directly measured in the fermentation broth and successfully inspected for adulteration using our novel data pre-processing method. These adulterations manifested as strong fluctuations in the shape and offset of the absorption spectra. They resulted from cells, cell clusters, or gas bubbles intercepting the optical path of the dip probe. In the proposed data pre-processing method, adulterated signals are removed by passing the time-scanned non-averaged spectra through two fi lter algorithms with a 5% quantile cutoff. The filtered spectra containing meaningful data are then averaged. A second step checks whether the whole time scan is analyzable. If true, the average is calculated and used to prepare the PLSR models. This new method distinctly improved the prediction results. To dissociate possible correlations between analyte concentrations, such as glucose and ethanol, the feeding analytes were alternately supplied at different concentrations (spiking) at the end of the four anaerobic fermentations. This procedure yielded low-error (anaerobic) PLSR models for predicting analyte concentrations of 0.31 g/l for biomass, 3.41 g/l for glucose, and 2.17 g/l for ethanol. The maximum concentrations were 14 g/l biomass, 167 g/l glucose, and 80 g/l ethanol. Data from the aerobic fermentation, carried out under high agitation and high aeration, were incorporated to realize combined PLSR models, which have not been previously reported to our knowledge.
    Journal of Applied Spectroscopy 11/2014; 81(5):855-851.
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    ABSTRACT: The aim of this study was to test a simple and inexpensive method of electrospinning in order to produce narrow diameter nanofi bers for industrial applications. The zirconium oxide nanofi ber is made by electrospinning on an aluminum plate. In this method, a high voltage is applied between the needle of a syringe and an aluminum plate. A viscous liquid is poured into the syringe and a jet is produced on the desired plate due to high voltage. The crystalline structure and morphology of the produced nanofi bers were studied by XRD and SEM. Results showed that nanofi bers with a smaller diameter were produced at higher annealing temperatures.
    Journal of Applied Spectroscopy 10/2014; 81(4):691-693.
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    ABSTRACT: T1 values in pure D2O and D2O solutions of human serum albumin (HSA) were measured versus temperature. A formula was derived based on H–H interactions between the surface HDO and non-exchangeable protein protons. The formula was used to evaluate the average distance of the interactions (rav). The effective correlation times were then derived by replacing the experimental data in the formula. Short correlation times obtained for the solution with low HSA (0.02 g albumin for one ml of D2O) decreased from 53 to 29 ps, while longer times increased from 1.19 to 2.22 ns. They are of the order of a fraction of a nanosecond for the solution with high HSA (0.08 g albumin per one ml of D2O). The perfect consistency between the derived theory and experimental data indicates that the high-field 1/T1 in D2O solutions of albumin is caused by dipolar interactions between the surface HDO and non-exchangeable protein protons. It also suggests that the effective correlation time of the surface HDO is of the order of the mean lifetime of short-lived surface water.
    Journal of Applied Spectroscopy 07/2014; 81(3):365-370.
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    ABSTRACT: In2S3 thin fi lms are grown on glass substrates by vacuum thermal evaporation followed by annealing in vacuum between 330 and 400 °C for different time durations. We have investigated the infl uence of the annealing parameters on the characteristics of thin fi lms. It is shown that thermal treatment changed the crystal structure and optical energy band gap of In2S3 thin fi lms. Two energy band gaps were determined for all the fi lms, one indirect and the other direct.
    Journal of Applied Spectroscopy 05/2014; 81(2):293-296.
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    ABSTRACT: The propagation of electromagnetic waves is examined in inhomogeneous media where the product of the permittivity and permeability is independent of position. A plasma-like frequency dispersion of the refractive index in these media is predicted. It is established that there is a cutoff frequency below which electromagnetic waves cannot be excited in these media. In general, two types of inhomogeneous waves can propagate in these media: transverse electric and transverse magnetic. The magnetic field of the transverse electric waves has a longitudinal component and is elliptically polarized in the plane formed by the wave normal and the gradient of the parameters of the medium. The electric field of the transverse magnetic waves has similar properties.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: Trace metal elements and pigments in cultured freshwater pearls from the mollusk Hyriopsis cumingii have been analyzed by plasma emission spectroscopy, Raman scattering, and infrared spectroscopy to investigate the coloration mechanism. The colors of the pearls are closely related to the presence of trace elements and the na-ture of the pigments. Purple pearls show much higher Ti, Ag, Mg, and Zn concentrations compared with the other samples. The concentration of polyenic molecules without methyl groups in the purple pearls is higher than in orange pearls. The organic matrix has been extracted via a decalcification process involving a weak acid (acetic acid). The estimated chemical formula of the pearl pigment is CHO-(-CH = CH-)10-OCH2OH.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: Cathodoluminescence, photoluminescence, and photoluminescence excitation spectra of ZnGa2O4:Cr thin films were investigated. Sublinear lux-ampere cathodoluminescence characteristics were obtained at current densities 0.001-8 mA/cm2. Bands in luminescence spectra were interpreted and their relation to the film production conditions was determined. It was found that the local crystal-field strength in the films increased after annealing in argon although the increase was less than that of films annealed in air.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: We present the results of a study of Cd0.5Zn0.5S films obtained from thiourea coordination compounds (complexes) of cadmium and zinc bromides, doped with copper ions in a concentration of 10-5 and 10-4 at.%. Films formed at 400°C have a wurtzite lattice. The bandgap widths for the pure and doped films, obtained from the reflectance spectra near the fundamental absorption edge, are equal to 3.17 ± 0.1 eV. An up to 10-fold increase in luminescence intensity was detected for the copper-doped films. We propose a structure for the luminescence centers of copperdoped Cd0.5Zn0.5S films and a mechanism for the increase in luminescence intensity for the copper-doped films.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: The acousto-optical diffraction of Bessel light beams (BLB) propagating near the optical axis of uniaxial gyrotropic crystals is examined. It is shown that polarization-independent modulation of Bessel beams is possible in paratellurite crystals; that is, the Bragg diffraction efficiency is independent of the polarization state of the incident beam. The physical reason for this kind of modulation is found to be the simultaneous occurrence of two anisotropic diffraction processes, such that the conditions for Bragg synchrony are satisfied for orthogonally polarized elliptical Bessel beams. The coupled wave equations and an overlap integral method are used to study the dependence of the diffraction efficiency on the length of the acousto-optical interaction, the ultrasonic power, and the polarization state of the incident Bessel beam.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: The polarization properties of reflection Denisyuk holograms produced in a photo-anisotropic gyrotropic material by an unpolarized coherent light source are studied experimentally. The polarization state of the reconstructed image is found to depend on the polarization of the reproducing beam (polarization holographic memory). This effect is examined theoretically. Under certain limiting conditions on isotropic, anisotropic, and gyrotropic reactions of a polarization sensitive medium, the recovered image can be adequate with respect to the state and degree of polarization. When unpolarized light is used, the Jones matrix of the hologram responsible for the reconstructed image is equal to the Jones matrix of the object itself to within a constant factor; that is, illuminating the hologram with a wave of specified polarization yields a reconstructed field of the object that is identical, in terms of polarization, to the field of the object illuminated a priori with this wave. This method has been used to reproduce the degree of polarization of a partially polarized wave field and to study the polarization holographic characteristics of a photoanisotropic gyrotropic material.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: Raman spectra of a LiNbO3:Cu ([Cu] = 0.015 mass%) crystal grown from the melt of congruent composition and a crystal of stoichiometric composition (LiNbO3stoich) that was grown from the melt with 58.6 mol% Li2O were studied upon excitation in the UV, visible, and near-IR regions. It was found that the intensities of forbidden lines for LiNbO3stoich crystal were linear functions of the exciting radiation wavelength whereas a clearly resolved maximum in the visible region was observed for LiNbO3:Cu crystal ([Cu] = 0.015 mass%). This was possibly due to the fact that the photorefractive effect for the LiNbO3stoich crystal was determined by intrinsic defects; for the LiNbO3:Cu crystal ([Cu] = 0.015 mass%), by both intrinsic defects and photorefractive copper cations.
    Journal of Applied Spectroscopy 02/2014; 81(1).
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    ABSTRACT: Two simple, accurate and precise spectrophotometric methods are developed and validated for the assay of pyrantel pamoate (PP) in pharmaceuticals. The methods employ the oxidative property of potassium permanganate (KMnO4) in acidic and alkaline conditions. In the first method (method A), PP is converted into its free base, pyrantel (PR), and treated with known excess of KMnO4 in acidic condition followed by the measurement of unreacted KMnO4 at 550 nm. Method B is based on the registration of absorbance of green colored chromogen formed due to the reduction of KMnO4 by PP in alkaline condition. The methods obeyed Beer's law over a range of 1-20 μg/ml in inverse manner, and 0.75-15 μg/ml for method A and method B, respectively, with apparent molar absorptivity values of 1.05⋅104 and 2.85⋅104 l⋅mol-1⋅cm-1. The optical parameters such as limits of detection (LOD), quantification (LOQ), and the Sandell sensitivity values are also reported. The accuracy and precision of the methods are assessed on intra- and inter-day basis. A recovery study by standard addition procedure is also carried out for further assurance of accuracy. The developed methods are successfully applied to determine PP in tablets. The results are more satisfactory as per current ICH guidelines.
    Journal of Applied Spectroscopy 02/2014; 81(1).