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  • Electronic Resource  (25)
  • 1975-1979  (15)
  • 1970-1974  (8)
  • 1900-1904  (2)
  • 11
    Electronic Resource
    Electronic Resource
    Abundance of Fe relative to H at 1.5 solar radii (1975)
    Springer
    Solar physics 42 (1975), S. 487-496 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The abundance of Fe relative to H is obtained by using resonantly scattered intensities of λ 284 of Fe XV that were measured with OSO-7 and resonantly scattered intensities of Lα of H I that were obtained by Gabriel (1971). Because of possible differences in electron densities along lines of sight for these non-simultaneous measurements and in relative calibrations, results are rather uncertain but still indicate that the average Fe abundance relative to H in the corona appears to be at least as large as a recent photospheric abundance. Some limitations in using this method for obtaining abundances are examined for future experiments with simultaneous measurements and well calibrated detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149928
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  • 12
    Electronic Resource
    Electronic Resource
    Calibration of OSO-7 Fexv 284Å spectroheliograms in solar-geophysical data bulletin (1974)
    Springer
    Solar physics 38 (1974), S. 415-417 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155078
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  • 13
    Electronic Resource
    Electronic Resource
    Conditions for the onset of vaporization in superfluid liquid He II in the presence of heat flow (1971)
    Springer
    Journal of low temperature physics 4 (1971), S. 485-488 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of the vaporization onset associated with heat flow are used as a tool to probe the superfluid thermohydrodynamics during entropy transport. Onset-flux-density data of the heat flow suggest that the normal fluid viscous force dominates during entropy transport from a single source (strip) to bulk He II over a layer of thickness 10 −4 cm (upper bound) or less.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00631127
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  • 14
    Electronic Resource
    Electronic Resource
    The regulation of feeding in Locusta migratoria: Internal inhibitory mechanisms (1973)
    Springer
    Entomologia experimentalis et applicata 16 (1973), S. 329-342 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Alle Hauptnerven des Mund- und Rachennervensystems wurden kontrolliert reseziert. Erst wenn die rückwärtigen Rachennerven zerschnitten werden, nehmen die Insekten wesentlich mehr Nahrung zu sich. Solche Insekten versuchen längere Zeit zu fressen. Wenn sich während des Fressens der Vorderdarm füllt, wird keine Nahrung an den Mitteldarm weitergegeben und sein Vorderende ist der letzte Teil, der sich vollständig ausdehnt. Nach Durchtrennung der rückwärtigen Rachennerven sind alle Teile des Vorderdarms offen-sichtlich mehr gedehnt. Eine solche erhöhte Nahrungsaufnahme tritt aber nicht ein, wenn die Nahrung relativ ungünstig ist. Das Abbinden des Kropfes verursacht beim nachträglichen Fressen keine übermäßige Ausdehnung des Vorderteiles. Die Nahrungsaufnahme hat keinen Unterschied im Körpervolumen zur Folge und das Durchtrennen des ventralen Nervenstranges bleibt ohne Einfluß auf die nachträglich aufgenommenen Nahrungsmengen. Das vergrößerte Darmvolumen wird durch Kollaps des Luftsackes kompensiert.
    Notes: Abstract During the course of a meal by insects with an empty gut, food is held in the foregut and the midgut remains empty. The last part of the foregut to fill is the extreme anterior end of the crop, and stretch receptors in this region control the amount eaten. Cutting the posterior pharyngeal nerves isolates these receptors from the frontal garglion and results in hyperphagia pharyngeal nerves isolates these receptors from the frontal garglion and results in hyperphagia during one meal. On unfavourable food, when smaller amounts are eaten, distension of the foregut is not involved in regulating meal size. Feedback from receptors in the body wall is not important in regulating meal size; most of the increase in gut volume resulting from feeding is taken up by the collapse of the air sacs so that there is little or no change in the body volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334244
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  • 15
    Electronic Resource
    Electronic Resource
    The functions of the maxillary palps of Acrididae (Orthoptera) (1970)
    Springer
    Entomologia experimentalis et applicata 13 (1970), S. 363-376 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Funktionen der Maxillartaster von Locusta migratoria migratorioides (R. & F.), Schistocerca gregaria (Forskål) und Chortippus parallelus (Zett.) wurden unter Anwendung verschiedener Verfahren untersucht. Die Tasterbewegungen wurden kinematographisch analysiert und als Schlagen und Tasten klassifiziert; das letztere tritt hauptsächlich kurz vor und nach, aber ebenso gut auch während der Nahrungsaufnahme auf. Die Sensillen an den Tasterenden berühren beim Tasten häufig das Substrat. Vorausgesetzt, daß die Insekten nicht gehungert hatten, wurde Bellis allein nach Betasten abgelehnt; nach längerem Hungern erfolgte jedoch die Ablehnung erst nach Beißen. Weitere Versuche, bei denen Extrakte der Kutikula von Poa oder Bellis verwendet wurden, zeigten, daß Annahme oder Ablehnung von der chemischen Natur des Substrats abhängen, welches von den Tastern berührt wird. Betasten eines geeigneten Substrats führte nicht unmittelbar zum Beißen, ruft aber eine Verhaltensweise hervor, die ihrerseits das Beißen fördert. Daraus wird geschlossen, daß die von den Tastern wahrgenommenen chemischen Reize für die Nahrungswahl der Acrididen wichtig sind, wenn die Insekten normal fressen. Nach Hunger ruft mechanische Reizung der Taster oder anderer Mundteile Beißen auch beim Fehlen geeigneter chemischer Reize hervor. Die häufigen kurzen Kontakte der Palpen mit dem Substrat während des Tastens erlauben offenbar den Sensillen, einen beständigen Strom von Informationen an das Zentralnervensystem zu liefern, ohne selbst angepaßt (ermüdet) zu werden.
    Notes: Abstract The functions of the maxillary palps of acridids have been investigated in experiments with Locusta migratoria migratorioides (R. & F.), Schistocerca gregaria (Forsk.) and Chorthippus parallelus (Zett.). The palp makes small irregular flicking movements and more extensive rapid vibrations described as palpation. Both activities involve the same basic movements of the palp segments. Palpation is essentially related to feeding and in normally feeding insects the palps play an important role in food selection, but as starvation is prolonged they become unimportant. Selection depends on appropriate chemical stimulation from the cuticle on the surface of the leaf. Palpation on this leads to head lowering and to biting if appropriate tactile stimuli are then received. The control of biting is discussed. The frequent but very brief, contacts of the sensilla on the tips of the palps with the substratum during palpation may enable them to relay information to the central nervous system more or less continuously without adapting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333491
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  • 16
    Electronic Resource
    Electronic Resource
    Meal size in nymphs of Locusta migratoria (1972)
    Springer
    Entomologia experimentalis et applicata 15 (1972), S. 399-410 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Nahrungsmenge, die von einer Larve der Wanderheuschrecke, Locusta migratoria L., im fünften Entwicklungsstadium bei einer einzigen Mahlzeit verzehrt wird, wurde ermittelt, indem ihr Darm und Darminhalt sofort nach dem Fressen gewogen wurden. In der Mitte des Entwicklungsstadiums wurden größere Mengen verzehrt, Weibchen fraßen mehr als Männchen, jedoch sind die weiblichen Larven ja auch größer. Die Menge der aufgenommenen Nahrung vergrößerte sich mit der Dauer künstlichen Futterentzuges. Sie erreichte ihren Höhepunkt nach sechs Stunden, nach welcher Zeit der Vorderdarm absolut leer war. Die verzehrten Mengen waren je nach der Art der Nahrung unterschiedlich. Auch stellten die Insekten sich so ein, daß sie von einer bestimmten Nahrung mehr zu sich nahmen, wenn sie daran aufgezogen worden waren. Nach längeren Zeitspannen der Isolierung hatten sie die Tendenz, weniger zu fressen. Temperatur und Feuchtigkeit hatten keinen Einfluß auf die Mengen, die verzehrt wurden, außer bei 40°, bei welcher Temperatur sich das gesamte Verhalten zum Fressen ändert.
    Notes: Abstract Meal size in fifth-instar nymphs of Locusta migratoria L. has been investigated by weighing the gut and its contents immediately after feeding. Larger meals are taken in mid-instar, while females eat more in one meal than males under the same conditions. Bigger meals are also eaten after longer periods of food deprivation, but after deprivation for two hours or less, corresponding with the normal interfeed length, meals are smaller than would be expected from the potential maximum foregut volume. The maximum volume attained varies with the type of food available to the insects and is influenced by previous conditioning. Temperature and humidity do not affect meal size except at 40°, at which temperature the usual pattern of feeding is completely altered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293604
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  • 17
    Electronic Resource
    Electronic Resource
    Redeposition: a factor in ion-beam etching topography (1977)
    Springer
    Journal of materials science 12 (1977), S. 1125-1133 
    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 The design of high performance SAW resonators and reflection pulse compression filters using grooves as the reflective arrays requires that the profiles of the grooves be rectangular and reproducible. The use of neutralized ion-beam technology has largely been adopted for etching these grooves in quartz and lithium niobate because of the precision and control which can be exercised in its use. The experimental work presented here asserts the major contribution that redeposition makes in the evolution of ion-beam etched topography of amorphous, polycrystalline and crystalline materials in a way which is directly useful to the determination of groove profiles. Data are also presented on the relationship between the incidence angle of the ion beam and the etch rate of some important SAW materials indicating the connection between this function and the etching characteristics of the materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426849
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  • 18
    Electronic Resource
    Electronic Resource
    Redeposition: a factor in ion-beam etching topography (1977)
    Springer
    Journal of materials science 12 (1977), S. 1125-1133 
    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 The design of high performance SAW resonators and reflection pulse compression filters using grooves as the reflective arrays requires that the profiles of the grooves be rectangular and reproducible. The use of neutralized ion-beam technology has largely been adopted for etching these grooves in quartz and lithium niobate because of the precision and control which can be exercised in its use. The experimental work presented here asserts the major contribution that redeposition makes in the evolution of ion-beam etched topography of amorphous, polycrystalline and crystalline materials in a way which is directly useful to the determination of groove profiles. Data are also presented on the relationship between the incidence angle of the ion beam and the etch rate of some important SAW materials indicating the connection between this function and the etching characteristics of the materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553602
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  • 19
    Electronic Resource
    Electronic Resource
    Ulcerative colitis in association with Takayasu's disease (1978)
    Springer
    Digestive diseases and sciences 23 (1978), S. 660-662 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01072601
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  • 20
    Electronic Resource
    Electronic Resource
    Evaluation of some statistical methods of interpreting multi-element geochemical drainage data from New Brunswick (1978)
    Springer
    Mathematical geology 10 (1978), S. 195-224 
    Details
    ISSN: 1573-8868
    Keywords: geochemical exploration ; multivariate analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Univariate and multivariate statistical methods were evaluated using published multi-element stream sediment data from southwestern and northern New Brunswick. The statistical distributions of elements do not obey Ahrens' “law of lognormality”; eleven of thirteen elements investigated for the Bathurst-Jacquet River area are not lognormally distributed at the 0.05 level of significance. The distributions are positively skewed and leptokurtic and consist of aggregate populations which represent mineral deposits, bedrock, and many other physiographic factors; some of these populations are normally distributed. The efficiency of the Pearson correlation coefficient varied and was compared to nonparametric correlation. Various methods of factor analysis were evaluated and the structure of the factors was similar to the subjective groupings derived from the correlation matrices. Comparison of correlation coefficients and factor models derived from the log-transformed and untransformed Bathurst-Jacquet River data showed that background associations were enhanced by the log transformation at the expense of associations representing mineralization. Q-mode factor matrices could not be satisfactorily interpreted without recourse to the mapping of the factor loadings. The maps produced were inferior to simple concentration maps. An iterative technique was developed for discriminant analysis to refine the sample training groups representing mineralized and background terrain; repeated discriminant analysis after misclassified samples were eliminated altered the inherent character of the training groups. Trend surface analysis was found to give goodness of fits of the trend equations comparable to the fits expected from random numbers. The method was mathematically inappropriate for the type of data used. The goal of exploration geochemical statistical analysis should be to discriminate and sort populations representing mineralized and background populations by classification or filtering techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032864
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