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  • Springer  (136)
  • American Chemical Society (ACS)
  • 2020-2024  (1)
  • 1970-1974  (135)
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of secondary flows in the use of a rheogoniometer (1970)
    Springer
    Rheologica acta 9 (1970), S. 164-170 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01973474
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  • 2
    Electronic Resource
    Electronic Resource
    The actographic examination of flight activity of the cocoa mirid Distantiella theobroma (Hemiptera: Miridae) (1973)
    Springer
    Entomologia experimentalis et applicata 16 (1973), S. 53-63 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Un appareil a été conçu pour enregistrer l'activité de vol dans les conditions naturelles et a été utilisé pour étudier le comportement des mâles et des femelles de D. theobroma, aux diverses phases de leur vie imaginale. L'activité de vol de D. theobroma eest exclusivement diurne. Les femelles restent relativement inactives pendant les premiers trois jours de leur vie imaginale. Après le début de maturité et bien que non encore accouplées, on note un accroissement de leur activité qui est maximum vers le milieu du jour, mais s'atténue pendant la fin de l'après-midi, alors qu'elles manifestent un comportement d'appel et se révèlent attractives pour les mâles. Les femelles qui se sont accouplées montrent un début d'activité tôt le matin et qui s'accroît pour atteindre un pic bien marqué en fin de l'après-midi, pour décliner ensuite avec la baisse de l'intensité lumineuse. L'activité des mâles commence plus tard et atteint son maximum vers 16h30. Ceci coïncide avec le moment où le plus grand nombre de femelles manifestent un comportement d'appel. Le vol des mâles n'apparaît qu'au-dessus d'un certain seuil d'intensité lumineuse et est inhibé par la pluie. Le changement avec l'âge de l'activité des femelles vierges présente des modalités caractéristiques qui se révèlent concorder avec les variations du nombre de mâles attirés par les femelles vierges de différents âges.
    Notes: Abstract The patterns of flight activity of adult Distantiella theobroma were recorded in an actograph placed in the field. Flight activity of virgin females showed a non-linear increase with age, was highest around mid-day and related to sex attraction behaviour. Mated females and males both showed sharp peaks of activity in the late afternoons. Male flight was depressed by low light intensities and all activity declined with falling light intensity in the evenings and ceased entirely during the hours of darkness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333550
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  • 3
    Electronic Resource
    Electronic Resource
    Stellar dynamics (1974)
    Springer
    Celestial mechanics and dynamical astronomy 9 (1974), S. 349-357 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This review attempts to place stellar dynamics in relation to other dynamical fields and to describe some of its important techniques and present-day problems. Stellar dynamics has some parallels, in increasing order of closeness, with celestial mechanics, statistical mechanics, kinetic theory, and plasma theory; but even in the last case the parallels are not very close. Stellar dynamics describes, usually through distribution functions, the motions of a large number of bodies as they all act on each other gravitationally. To a good approximation each star can be considered to move in the smoothed-out field of all the others, with random encounters between pairs of stars adding a slow statistical change to these smooth motions. Smooth-field dynamics has a well-developed theory, and the state of smooth stellar systems can be described in some detail. The ‘third integral’ presents an outstanding problem, however. Stellar encounters also have a well-developed theory, but close encounters and encounters of a single star with a binary pose serious problems for the statistical treatment. Star-cluster dynamics can be approached through a theory of smooth-field dynamics plus changes due to encounters, or alternatively through numerical simulations. The relation between the two methods is not yet close enough. The dynamical evolution of star clusters is still not fully understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228576
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  • 4
    Electronic Resource
    Electronic Resource
    An optical cell for photographic studies of gas evolution during molten salt electrolysis (1972)
    Springer
    Journal of applied electrochemistry 2 (1972), S. 23-29 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The simple optical cell described is useful for providing supplementary information on the evolution of gases during the electrolysis of fused salts or other electrolytes. Its use with PbS-PbCl2 and PbS-PbCl2-NaCl melts demonstrated that, for anodic sulphur gas production, residual gas evolution occurs, indicating the formation of a chemisorbed species as a reaction intermediate. Dissolution of the sulphur in the melt also takes place; its rate increases with increase in temperature and sulphide concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615188
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  • 5
    Electronic Resource
    Electronic Resource
    A fifth-order family of modified Newton methods (1971)
    Springer
    BIT 11 (1971), S. 409-412 
    Details
    ISSN: 1572-9125
    Keywords: nonlinear equation ; order of convergence ; Newton method ; zero ; root ; iteration ; 5.1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Addition of a correction term every other Newton iteration provides a fifth-order method for finding simple zeros of nonlinear functions. A two-parameter family of such methods is developed. Each family member requires the given function and its derivative to be evaluated at two points per step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01939409
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  • 6
    Electronic Resource
    Electronic Resource
    An improved pegasus method for root finding (1973)
    Springer
    BIT 13 (1973), S. 423-427 
    Details
    ISSN: 1572-9125
    Keywords: 5.1 ; Regula Falsi ; nonlinear equations ; root finding ; Pegasus method ; order of convergence ; Snyder's method ; Illinois method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A method of Regula Falsi type for finding a simple root of a non-linear equation is presented. It is similar to the Pegasus procedure, but exhibits a higher asymptotic convergence efficiency. This is accomplished by eliminating one or two of the slower Pegasus substeps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01933405
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  • 7
    Electronic Resource
    Electronic Resource
    The change in satellite orbital inclination caused by a rotating atmosphere with day-to-night density variation (1972)
    Springer
    Celestial mechanics and dynamical astronomy 5 (1972), S. 41-54 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory specifying the change Δi in a satellite's orbital inclination due to atmospheric rotation, in terms of the decrease in orbital period ΔT, has been extended to an atmosphere with sinusoidal variation of density between day and night. It is found that with certain special sets of values for the orbital parameters, the day-to-night variation in the Earth's atmosphere can alter the equation for Δi/ΔT by as much as 25% though only for a few days. Appreciable changes in Δi/ΔT persisting for several months can only occur for certain resonant orbits: the maximum change is then about 8%. Near-resonance is very unlikely, but the resonance conditions are derived so that orbits can be recognised and avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227822
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  • 8
    Electronic Resource
    Electronic Resource
    Optical isotope shifts in neodymium (1973)
    Springer
    The European physical journal 265 (1973), S. 207-224 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isotope shifts have been measured in Nd II from which the shifts between pure configurations 4f 4 6s and 4f 4 5d can be determined. The specific mass shift for such a “transition” was estimated to be + 3 mK for a change of two neutrons. By comparison with electronic X-ray isotope shifts the following values were obtained for the change in the nuclear charge distributionδ〈r 2〉 [fm2]: (142, 144) 0.277; (144, 146) 0.257; (146, 148) 0.286; (148, 150) 0.381; (142, 143) 0.130; (144, 145) 0.111. Field shifts in several optical transitions have been compared with values of ¦ψ(0)¦2 obtained from Hartree-Fock wave functions; agreement is good. Other specific mass shifts have been estimated 4f 4 6s− 4f 4 6p, −1 mK; 4f 4 6s− 4f 3 5d 2, −30 mK. These values are in good agreement with calculated values of −1.1 and −30.6 mK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01397715
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  • 9
    Electronic Resource
    Electronic Resource
    Nuclearg-factors of the 328 keV state in194Pt, the 240 keV state in195Pt, and the 356 keV state in196Pt determined by recoil-implantation into iron and cobalt hosts (1974)
    Springer
    The European physical journal 270 (1974), S. 163-167 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The iron-implantation-perturbed-angular-correlation technique (IMPACT) has been used to measure the Larmor precessions of the 328, 240, and 356 keV states of194Pt,195Pt, and196Pt nuclei, respectively, in ferromagnetic iron and cobalt hosts. The observed angular precessions in iron, corrected for the transient field effect, wereω τ 194(328)=0.103±0.006 rad,ω τ 195 (240)=0.142±0.012, andω τ 196(356)=0.084±0.010. For cobalt hosts, the observed Larmor precessions were ω τ194(328)=0.068±0.006, ω τ195(240)=0.096±0.012, andω τ 196(356)=0.057±0.013. Agreement between theg-factors obtained from the measurements in iron hosts and the measurements in cobalt hosts is very good, and a weighted average of the two measurements givesg 194(328)=0.349±0.031,g 195 (240)=0.136±0.013, andg 196(356)=0.329±0.039.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01680405
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  • 10
    Electronic Resource
    Electronic Resource
    Slow spontaneous signals from brain tissue culture (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 13-16 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen La exploratión con microelectrodos, de explantes telencefálicos de embrión de pollo, registra espontáneamente señales de dos tipos: lentas y rápidas, confirmando hallazgos similares previamente reportados con macroelectrodos. Observandose un patron en la distributión de las señales lentas, las cuales son originadas por la misma fuente en cada explante pudiendo ser esta, las células de glía o el producto de potensiales dendríticos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01900360
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