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  • 1
    Electronic Resource
    Electronic Resource
    Determination of activity coefficients using a flow EMF method. 1. HCl in methanol-water mixtures at 25, 35 and 45°C (1993)
    Springer
    Journal of solution chemistry 22 (1993), S. 137-150 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; emf ; ion selective electrode ; HCl ; aqueous methanol mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A method to determine activity coefficients of electrolytes in mixed solvent is described which makes use of ion-selective electrode(s) (ISE) and in which a concentrated electrolyte solution is continuously added. Activity coefficients for HCl in methanol-water mixtures containing 0, 10, 20, 30, 50, 70, and 90 weight percent methanol at 25, 35 and 45°C were calculated using the Pitzer equation, and the electromotive force (emf) data of the cell: $$pH - glass electrode\backslash HCl in H_2 O - CH_3 OH\backslash AgCl - Ag$$ The experimental results agree well with literature values indicating that the proposed method is procise and reliable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650680
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous determination of neodymium and erbium in rare earth mixture with 5,7-dibromo-8-hydroxyquinoline and TX-100 by third-derivative spectrophotometry (1993)
    Springer
    Microchimica acta 110 (1993), S. 119-126 
    Details
    ISSN: 1436-5073
    Keywords: neodymium ; erbium ; 5,7-dibromo-8-hydroxyquinoline ; rare earths determination ; derivative spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 5,7-dibromo-8-hydroxyquinoline in the presence of octylphenol poly(ethyleneglycol)ether have been studied by normal and third-derivative spectrophotometry. The proposed method is free of interference of other rare earths. The calibration graphs were linear up to 18 μg/ml of neodymium and 21 μg/ml of erbium (in the final solution). The derivative molar absorptivities are 395 l.mol–1.cm−1 for neodymium and 3421.mol−1.cm−1 for erbium. The corresponding values of Sandell's sensitivity were 0.36 and 0.49 μg.cm−1, respectively. The relative standard deviations evaluated from ten independent determinations of 2.5 μg/ml of neodymium and erbium are 1.5 and 3.8% for neodymium and 1.8 and 4.1% for erbium in absence and presence of 70 μg of lanthanum, respectively. The detection limits (signal to noise ratio=2) are 0.23 μg/ml for neodymium and 0.30 μg/ml for erbium. The method has been used for the determination of neodymium and erbium in mixed rare earths with satisfactory results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243993
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  • 3
    Electronic Resource
    Electronic Resource
    Analogy between real irreducible tensor operator and molecular two-particle operator (1997)
    Springer
    Theoretical chemistry accounts 96 (1997), S. 135-139 
    Details
    ISSN: 1432-2234
    Keywords: Key words: Irreducible tensor operator ; Matrix element ; Real basis ; Symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract . Molecular matrix elements of a physical operator are expanded in terms of polycentric matrix elements in the atomic basis by multiplying each by a geometrical factor. The number of terms in the expansion can be minimized by using molecular symmetry. We have shown that irreducible tensor operators can be used to imitate the actual physical operators. The matrix elements of irreducible tensor operators are easily computed by choosing rational irreducible tensor operators and irreducible bases. A set of geometrical factors generated from the expansion of the matrix elements of irreducible tensor operator can be transferred to the expansion of the matrix elements of the physical operator to compute the molecular matrix elements of the physical operator. Two scalar product operators are employed to simulate molecular two-particle operators. Thus two equivalent approaches to generating the geometrical factors are provided, where real irreducible tensor sets with real bases are used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002140050214
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  • 4
    Electronic Resource
    Electronic Resource
    Superconvergent approximations for Wiener-Hopf equations (1996)
    Springer
    Acta mathematicae applicatae sinica 12 (1996), S. 371-376 
    Details
    ISSN: 1618-3932
    Keywords: Galerkin approximations ; iteration ; correction ; adaptable method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, by means of Sloan's iteration technique, we present a kind of iterative correction method for Galerkin approximations of Wiener-Hopf equations, and show that this is not only a high order method but also an adaptable one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02029064
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  • 5
    Electronic Resource
    Electronic Resource
    A high order method for non-smooth Fredholm equations (1997)
    Springer
    Acta mathematicae applicatae sinica 13 (1997), S. 17-22 
    Details
    ISSN: 1618-3932
    Keywords: Collocation approximation ; correction ; adaptable method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we deal with a class of the second kind of non-smooth Fredholm integral equations, which are related closely to Wiener-Hopf equations. Using Sloan's iterative technique, we obtain the superconvergent approximations. By means of the correction and collocation methods, we present a kind of iterative correction collocation approximations for this kind of equations, and show that this method is not only a high order and more simple method but also an adaptable one (see e.g. [11]).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020477
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  • 6
    Electronic Resource
    Electronic Resource
    Oxygen vacancy concentration variation, diffusivity and thermo-chemical stability of La0.2Ba0.8Co0.2Fe0.8O3−δ membranes (2000)
    Springer
    Journal of materials science 35 (2000), S. 4329-4335 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Perovskite type La0.2Ba0.8Co0.2Fe0.8O3−δ (LBCF) powders were synthesized by modified citrate pyrolysis and LBCF membranes were prepared by isostatic pressing. The oxygen vacancy concentration variation of the LBCF powders becomes substantial above 973 K due to order-disorder transition. The unsteady-steady oxygen permeation flux of the LBCF membrane decreases with time and it takes about 40 min to get the steady state. In the temperature range of 1073–1223 K, the oxygen vacancy diffusivity of the LBCF membrane increases almost a magnitude and the increasing of oxygen permeation flux is mainly attributed to the increasing of oxygen vacancy diffusivity. An in-situ high-temperature X-ray diffraction was used to study the stability of the LBCF membrane, indicating that it has good thermochemical stability at elevated temperatures and low oxygen partial pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004844604573
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  • 7
    Electronic Resource
    Electronic Resource
    Removal of radioiodine from nuclear-fuel-reprocessing off-gases with silver-nitrate-impregnated silica gel (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 119 (1987), S. 109-118 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Silver-impregnated silica gels prepared by us have very good adsorption characteristics for both organic and inorganic radioiodine. Under the operating conditions applied, the adsorption capacity is up to 200 mg I g−1 and the utilization of silver on the sorbent is higher than 90%. The adsorbent can be used to remove iodine from nuclear fuel reprocessing off-gases and from air cleaning systems of nuclear reactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02169839
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  • 8
    Electronic Resource
    Electronic Resource
    A complex variable boundary element method for solving interface crack problems (1999)
    Springer
    International journal of fracture 96 (1999), S. 167-178 
    Details
    ISSN: 1573-2673
    Keywords: Boundary element ; pseudo-orthogonal ; interface crack ; stress intensity factor.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The problem of finite bimaterial plates with an edge crack along the interface is studied. A complex variable boundary element method is presented and applied to determine the stress intensity factor for finite bimaterial plates. Using the pseudo-orthogonal characteristic of the eigenfunction expansion forms and the well-known Bueckner work conjugate integral and taking the different complex potentials as auxiliary fields, the interfacial stress intensity factors associated with the physical stress-displacement fields are evaluated. The effects of material properties and crack geometry on stress intensity factors are investigated. The numerical examples for three typical specimens with six different combinations of the bimaterial are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018684831763
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  • 9
    Electronic Resource
    Electronic Resource
    A Simple Approach of Enlarging Convergence Regions of Perturbation Approximations (1999)
    Springer
    Nonlinear dynamics 19 (1999), S. 93-111 
    Details
    ISSN: 1573-269X
    Keywords: homotopy analysis method ; enlarging convergence region ; general Taylor theorem ; Van der Pol equation ; Riccati equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, a simple approach to enlarging convergence regions of perturbation approximations is proposed. Based on the so-called general Taylor theorems, this approach has a solid mathematical foundation. Moreover, it is rather simple to apply. Two nonlinear equations, the Riccati equation and the Van der Pol equation are used as examples to illustrate the validity and the great potential of this approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008373627897
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  • 10
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    Magnetic flocculants synthesized by Fe3O4 coated with cationic polyacrylamide for high turbid water flocculation (2018)
    Springer
    Details
    Publication Date: 2018-07-02
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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