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  • Articles  (218)
  • Springer  (209)
  • Nature Publishing Group  (9)
  • 1980-1984  (58)
  • 1970-1974  (37)
  • 1960-1964  (23)
  • 1925-1929  (100)
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  • Articles  (218)
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  • 1
    Electronic Resource
    Electronic Resource
    Light-dependent synthesis of cholecalciferol in a green plant (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 68-69 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For the present studies, T. flavescens and other grasses were sown in a dark room in wooden frames containing finely sieved soil and covered by cubic tents of aluminium foil to exclude all radiation from the outside. Inside, Grolux lamps of 30 W each were placed 60cm above the soil surface. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283068a0
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  • 2
    Electronic Resource
    Electronic Resource
    Internal origin for lunar rilled craters and the maria? (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 573-575 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Evidence for lunar vertical crustal movement is provided by Apollo 15 photographs of dipping structures on Silver Spur (25 40' N, 3 58' E)8 and by craters containing rilles indicating either uplift9 or subsidence10. Principal lineaments such as rilles and faults, and craters larger than 10 km ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248573a0
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular Oxygen Absorption of Solar Lyman-α observed by Interkosmos-1 (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1298-1298 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Theoretical curves of optical thickness at grazing incidence were calculated from the O2 and N2 densities given by the CIRA 1965 model atmosphere, which are nearly equal to the mean values between the summer and winter models of the US Standard Atmosphere Supplement 1966. Absorption cross-sections ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281298a0
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  • 4
    Electronic Resource
    Electronic Resource
    Proposed New Unit of Frequency (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 394-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-I propose the establishment of a new intermediate unit of frequency?pitts. The pitts equals "pulses per second", "nerve pulses per second" or "spikes per second", all relatively clumsy terms used indeterminantly by neurophysiologists, brain research workers and others. The proposed new unit ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/225394b0
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  • 5
    Electronic Resource
    Electronic Resource
    Transfer Function of a Biological Photoreceptor (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1173-1174 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A FULL description of the function of a sensory organ or sensory element should include definition of the limits of signal transfer. This can be done if the stimulating energy is monitored, and, at the same time, the nervous impulses emanating from the sensory receptor are detected and studied. It ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911173a0
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  • 6
    Electronic Resource
    Electronic Resource
    Biological optimality: Comparison of generalized feasibility and optimality conditions for linear, error-minimizing systems (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 777-791 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An attempt is made to compare the conditions for the general error-optimality of linear systems developed by Kalman with the conditions for feasibility of linear models of neuromuscular and physiological control systems. Models of three actual physiological systems are tested for both the above criteria. Theoretical analysis presented here shows that there are no simple relationships between the two sets of conditions. Analysis carried out on the physiological systems models suggests the need for a general set of conditions for other optimality criteria, such as time and energy minimization, similar to Kalman's condition for error minimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02465180
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  • 7
    Electronic Resource
    Electronic Resource
    A cofferdam design optimization (1972)
    Springer
    Mathematical programming 3 (1972), S. 263-275 
    Details
    ISSN: 1436-4646
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The design of circular type cellular cofferdams is formulated as a nonlinear optimization model that takes explicit account of relevant economic and technologic aspects. The objective is minimization of total expected cost. The constraints arise from stability critera to protect against failures due to slipping of the sheet piles on the river side and interlock stresses at the joint. A solution achieved with geometric programming techniques, yields optimal cell sizes and design heights. The geometric programming approach provides important design insights by yielding the proportions of the total cost to be assigned to the cost components, fill material, sheet piling and flooding in an optimal design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01585000
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  • 8
    Electronic Resource
    Electronic Resource
    Das optische Gesamtemissionsvermögen des Rheniums, Rhodiums, Palladiums und des Titans (1964)
    Springer
    The European physical journal 180 (1964), S. 178-183 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The total emissivity of rhenium, rhodium, palladium, and titanium has been measured over a temperature range from 1100°K to approximately the melting point. Discrepancies in the data as reported by several authors are discussed with respect to the different surface conditions of the metals investigated. — Resistivity values for these metals in the same temperature range are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380688
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Feldemission des Rhodiums und des Iridiums (1963)
    Springer
    The European physical journal 172 (1963), S. 503-511 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die FE-Bilder des Rh und Ir sind gleich. — Die lokale Emission sauberer Einkristallspitzen dieser beiden Metalle nimmt in derselben Reihenfolge zu, in der die örtliche Packungsdichte dieser Spitzen abnimmt. — Aus der Emissionsverteilung der Rh- und Ir-Spitzen läßt sich nur eine Attraktion zwischen erstnächsten Gitterbausteinen dieser Materialien folgern. — Beobachtungen mit dem FEM an Metallspitzen mit verschiedener Gitterstruktur legen die Vermutung nahe, daß sich in den FE-Bildern der Metalle überhaupt nur eine Wechselwirkung zwischen solchen Bausteinen bemerkbar macht, deren Abstände nicht wesentlich größer als diejenigen der erstnächsten Nachbarn sind. — Eine Korngrenzenwanderung wurde an einer Rh-Spitze in einzelnen Phasen photographiert. — Platzwechselenergien des Rh auf arteigener Gitterunterlage wurden gemessen und mit berechneten Werten verglichen; die Übereinstimmung ist gut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378915
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  • 10
    Electronic Resource
    Electronic Resource
    Nachweis von Corticosteroiden in menschlicher Placenta und Isolierung von 16α-Hydroxytestosteron (1961)
    Springer
    Cellular and molecular life sciences 17 (1961), S. 510-512 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The occurrence of cortisol, cortisone, 20-dihydrometabolites of cortisone and several other steroidlike compounds in fresh placental tissue is described. Neither aldosterone, corticosterone nor 11-dehydrocorticosterone has been found. One of the most abundant compounds present has been identified as 16α-hydroxy-testosterone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02158627
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