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  • 1
    Electronic Resource
    Electronic Resource
    On a problem of Davison (1991)
    Springer
    Aequationes mathematicae 42 (1991), S. 297-297 
    Details
    ISSN: 1420-8903
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01818499
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of collimation and decollimation of an atomic beam in a misaligned standing wave (1994)
    Springer
    Applied physics 58 (1994), S. 327-331 
    Details
    ISSN: 1432-0649
    Keywords: 32.80.Pj ; 42.50.Vk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports an experimental study on the collimation and decollimation of an atomic beam in a misaligned standing wave, in which the effective detuning caused by the Doppler effect is affected by the longitudinal velocity of the atomic beam. The experiment shows that in a strong field with red detuning between laser field and atomic transition frequency, laser heating in a normal standing wave becomes laser cooling in a misaligned standing wave for an approriate misalignment angle. For blue detuning, laser cooling in a standing wave can also become laser heating in a misaligned standing wave for an appropriate condition. These results ca be used in controling atomic motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082629
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and characterization of a water-soluble fraction of crude oil by a Karr reciprocating-plate countercurrent extraction column (1994)
    Springer
    Archives of environmental contamination and toxicology 26 (1994), S. 527-533 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract A 1.8 m×2.5 cm reciprocating-plate countercurrent extraction column was evaluated for the preparation of WSF (water-soluble fractions) from Flotta North Sea light crude oil. The energy input from the plate reciprocation speeds was found to be the main factor affecting the characteristics of the extracted WSF, and the throughputs of the stock solution or the ratio of seawater to crude oil had little effect on the concentration and composition of the extracted WSF. A combination of a reciprocation speed of 170 strokes/min, a seawater flow rate of 220 ml/min, and a crude oil flow rate of 2.9 ml/min produced a WSF stock solution with a total hydrocarbon concentration of 13.5±0.30 mg/kg (n=6) which was more reproducible than that made by a previously used large-scale batch extraction method. A settlement time of 5 h or less for the stock solution allowed a full separation of any dispersed droplets of crude oil from the aqueous phase under the above conditions, but further increases in reciprocation speeds caused difficulties in the final separation of this crude oil. The column extraction method was highly reproducible and gave a more concentrated WSF containing a higher proportion of alkanes than a WSF made by the batch extraction method. Low-boiling aromatics were the main components of the total extracted hydrocarbons of the WSF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214157
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  • 4
    Electronic Resource
    Electronic Resource
    On a problem of Davison (1992)
    Springer
    Aequationes mathematicae 43 (1992), S. 90-93 
    Details
    ISSN: 1420-8903
    Keywords: 39B05 ; 26E05
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The present note gives an elementary positive answer to a question asked by Davison in the Twenty-seventh International Symposium on Functional Equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01840477
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous Lagrange interpolating approximation need not always be convergent (1994)
    Springer
    Constructive approximation 10 (1994), S. 87-93 
    Details
    ISSN: 1432-0940
    Keywords: 41A05 ; 41A28 ; Simultaneous approximation ; Lagrange interpolation ; Pairwise distinct nodes ; Chebyshev polynomials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Recently, several publications have been devoted to investigation of simultaneous Lagrange interpolating approximation. In this paper we carefully construct a counterexample with a system of nodes showing that the simultaneous Lagrange interpolating approximation need not always be convergent. It is especially interesting to note that the system of nodes behaving “badly” in this case is exactly the “near optimal choice” in the ordinary Lagrange interpolating case, the zeros of the Chebyshev polynomials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01205168
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  • 6
    Electronic Resource
    Electronic Resource
    On Müntz rational approximation (1993)
    Springer
    Constructive approximation 9 (1993), S. 435-444 
    Details
    ISSN: 1432-0940
    Keywords: 41A20 ; 41A30 ; Rational combinations ; Müntz system ; Monotone approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract One of the main results of the present paper shows that, for any sequence of real numbers {λn} with infinitely many distinct elements, the monotone rational combinations of {Xλn} always form a dense set in the uniform norm in the subspace of monotone functions fromC [0, 1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204650
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  • 7
    Electronic Resource
    Electronic Resource
    Gas-grain interaction in the low mass star-forming region B335 (1994)
    Springer
    Astrophysics and space science 216 (1994), S. 155-157 
    Details
    ISSN: 1572-946X
    Keywords: stars ; chemistry ; dust
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have modelled chemical abundances and line profiles in the Bok globule B335. The chemical characteristics of this star-forming core are largely determined by gas-grain interaction in the inflowing material. By comparing high resolution observational data with our model it should be possible to determine the evolutionary status of B335 and to establish the role that surface chemistry plays in protostellar clouds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982487
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  • 8
    Electronic Resource
    Electronic Resource
    A counterexample on monotone Müntz approximation (1994)
    Springer
    Acta mathematica hungarica 63 (1994), S. 57-64 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01874715
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  • 9
    Electronic Resource
    Electronic Resource
    A check for consistency between positron-atomic hydrogen total, positronium formation, and ionization cross section measurements (1994)
    Springer
    Hyperfine interactions 89 (1994), S. 461-467 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have recently measured total cross sections for 5 to 302 eV positrons scattered by atomic hydrogen using a beam transmission technique. A check for consistency is made between these measurements and prior measurements of positronium formation and ionization cross sections by making use of available theoretical calculations of elastic and excitation cross sections for positron-atomic hydrogen scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064531
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  • 10
    Electronic Resource
    Electronic Resource
    Measurements of total cross sections for positrons and electrons colliding with atomic hydrogen (1994)
    Springer
    Hyperfine interactions 89 (1994), S. 483-487 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured total cross sections for 5–302 eV positrons and 31–302 eV electrons scattered by atomic hydrogen using a beam-transmission technique. Atomic hydrogen obtained from a radio frequency (rf) discharge source flows into an aluminium scattering cell maintained at about 150 K to minimize recombination. Absolute total cross sections are obtained by making relative measurements for positrons and electrons scattering from H2 and a known mixture of H and H2, and then normalizing the measurements for positron-H2 scattering to prior absolute measurements. Our total cross section measurements for positrons and electrons scattering from H are found to be merged to within 5% for energies from 31 to 302 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064534
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