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  • 1
    Electronic Resource
    Electronic Resource
    Dynamical groups and spherical potentials in Classical Mechanics (1966)
    Springer
    Communications in mathematical physics 3 (1966), S. 323-333 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The one particle problem in a spherical potential is examined in Classical Mechanics from a group theorical point of view. The constants of motion are classified according to their behaviour under the rotation groupSO(3), i.e. according to the irreducible representationsD j ofSO(3) (section 1). The Lie algebras ofSO(4) andSO(3) are explicitly built in terms of Poisson brackets for an arbitrary potential, from global considerations. The Kepler and the 3 dimensional oscillator problems are shown to play particular roles with respect to these groups (sections 2 and 3). In the last section, the Kepler problem is analyzed with the aid of theSO(4) group instead of the Lie algebra. It is proved that the transformations generated by the angular momentum and the Runge-Lenz vector form indeed a group of canonical transformations isomorphic toSO(4). Consequences with respect to the quantization problem are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01645086
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  • 2
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    Dynamical groups and spherical potentials in Classical Mechanics (1966)
    Springer
    Details
    Publication Date: 1966-10-01
    Print ISSN: 0010-3616
    Electronic ISSN: 1432-0916
    Topics: Mathematics , Physics
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Emploi d'une suceuse hydraulique transformée pour les prélèvements quantitatifs dans les substrats meubles infralittoraux (1967)
    Springer
    Helgoland marine research 15 (1967), S. 500-505 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé 1. Cette communication a pour but de montrer l'avantage de la «suceuse hydraulique» deBrett (1964) par rapport à une benne de type classique. 2. Voici les rśultats globaux obtenus pour 4 stations différentes prospectées simultanement à la benne et à la «suceuse hydraulique». (a) Station Prado 1: Biomasse à la benne «Orange-Peel» 1,3 g/m2, à la «suceuse hydraulique» 4,6 g/m2. (b) Station Bandol: Biomasse à la benne «Orange-Peel» 0,5 g/m2, à la «suceuse hydraulique» 5,7 g/m2. (c) Station Vernon: Biomasse à la benne «Orange-Peel» 0,7 g/m2, à la «suceuse hydraulique» 6,5 g/m2. (d) Station Prado 2: Biomasse à la benne «Orange-Peel» 3,4 g/m2, à la «suceuse hydraulique» 8,7 g/m2. Les biomasses sont exprimées en poids sec d'animaux décalcifiés en gramme par métre carré.
    Notes: Abstract Brett (1964) has constructed a new apparatus for sampling macrofauna of the marine benthos. This apparatus is derived from the “gold sucker” employed byScuba divers for underwater work. It was used from 1965 for research on the productivity of some sand bottom communities (Venus gallina community ofPetersen). Some improvements have been made to obtain a good quantitative sampler. A comparison has been made between the biomasses obtained with an “Orange-Peel” grab and the hydraulic aspirator ofBrett, respectively; advantages and disadvantages are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01618646
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  • 4
    Electronic Resource
    Electronic Resource
    On Bochner's theorem on the critical index for multiple Fourier series (1968)
    Springer
    Mathematische Zeitschrift 103 (1968), S. 61-66 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111289
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  • 5
    Electronic Resource
    Electronic Resource
    Description d'Epimyrma algeriana (nov. sp.) (Hyménoptères Formicidae, Myrmicinae), fourmi parasite. Représentation des trois castes. Quelques observations biologiques, écologiques et éthologiques (1968)
    Springer
    Insectes sociaux 15 (1968), S. 157-170 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Riassunto Epimyrma algeriana (nova specie) è descritta per le tre caste. Questa forma algerina è vicina aE. ravouxi (André) da Francia, conoscita soltanto sulle femmine. E parassita delLeptothorax spinosa (Forel) pero nelle stazioni le più umide e sempre rara. La femmina delEpimyrma algeriana è poco feconda e relativement fragile in allevamento. I maschi e le femmine prodotti durantjl'estate sono poco numerosi; ci sono più di femmine che di maschi; dopo compaiono le operaie. Poi, la comunità pare condannata alla degenerazione. L'insediamento del parassito sarebbe agevolato da un microclima freddo ed umido diminuendo le reazioni defensive dell'ospite. L'adozione d'una giovane femmina delEpimyrma per un cominità di operaie e larve delL. spinosa in allevamento è riuscita alla temperatura di 12°C.
    Abstract: Summary Epimyrma algeriana, a newly discovered species of Ants is described in the three castes. This algerian form is akin toEpimyrma ravouxi (André) of France, of which, only four females are known. E. algeriana is a parasite onLeptothorax spinosa (Forel) in the moistest stations but remains always scarse. The female is little prolific and relatively fragile in breeding. Males and females hatched during summer are few in number; there are more ♂ than ♀; the workers appear later. Then the community seems bound to degeneration. The parasite introduction seems to be facilited by a cold and moist micro-climate, reducing the reactions of the host. The adoption of a young female ofEpimyrma by workers and larvae community ofL. spinosa, bred at a temperature of 12° Centigr. has been successfully achieved.
    Notes: Résumé Epimyrma algeriana est décrite pour ses trois castes. Cette forme algérienne est voisine d'E. ravouxi (André) de France, connue seulement sur les femelles. Elle parasiteLeptothorax spinosa (Forel) dans ses stations les plus humides mais demeure toujours rare. La femelle d'Epimyrma algeriana est peu féconde et relativement fragile en élevage. Les sexués produits en été sont peu nombreux; il y a plus de femelles que de mâles; les ouvrières apparaissent ensuite. Puis la communauté semble vouée à la dégénérescence. L'installation du parasite serait facilitée par un micro-climat froid et humide ralentissant les réactions défensives de l'hôte. On a réussi l'adoption d'une jeune femelle d'Epimyrma par une société d'ouvrières et de larves deL. spinosa en élevage, à la température de 12°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223464
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  • 6
    Electronic Resource
    Electronic Resource
    Minimal size of Nitrobacter membrane frangments retaining nitrite oxidizing activity (1968)
    Springer
    Archives of microbiology 61 (1968), S. 280-291 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The minimal size of active membrane fragments from sonic homogenates of a Nitrobacter cell suspension is about 22 mμ. Nitrite oxidizing activity is absent from particles smaller than that although the distribution of cytochrome a, a link in the respiratory chain responsible for nitrite oxidation, does not show any abnormality below the critical size indicated. Two independent estimates of the parameters of the cumulative distribution function for particle size in sonic homogenates have been made using either statistics from electron micrographs or sedimentation pattern observed after density gradient centrifugation. The distribution function was found to be of the log-normal type which was considered to be a consequence of the observed kinetics of sonic comminution. Another estimate of the parameters of the distribution function was made by fixed angle centrifugation, a method much less accurate with respect to size determination but which allowed a rapid estimate of nitrite oxidizing capacity remaining in particles smaller than the given size. Results from the first two determinations of the distribution function for particle size and of its parameters were then used for correcting the error in the estimate of the critical size from the activity found in supernatants from centrifugations in fixed angle rotors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446613
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  • 7
    Electronic Resource
    Electronic Resource
    Calorimetric measurement of free energy utilization by Nitrosomonas and Nitrobacter (1968)
    Springer
    Archives of microbiology 63 (1968), S. 256-277 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Calorimetric estimates of the utilization efficiency of the free-energy derived from substrate oxidation by cell suspensions of two nitrifying bacteria, Nitrosomonas and Nitrobacter, provided two ranges of values: 11 to 27% and 15 to 51%, respectively. About 15 to 30% of the utilized free-energy is used for driving endergonic reactions other than CO2 fixation, probably the synthesis of polyphosphates. The molar heat of substrate oxidation does not seem to be influenced by the age of cells harvested during growth or by the length of the incubation period during which cells have been kept in a buffer suspension in a starved condition. The loss of respiratory activity measured either by oxygen uptake or heat evolution in the presence of the specific substrate, nitrite or ammonium, decreases according to kinetics which are influenced by the aerobiosis of the suspension. The viability of the starved cells decreases in a way which is similar to that of the respiratory activity. It seemed impossible to obtain cells which had lost their viability but kept the ability to oxidize their substrate. Two inhibitors of the respiratory chain, quinacrine and cyanide, are without effect on the molar heat of substrate oxidation and consequently on the free-energy utilization efficiency. 2.4 dinitrophenol did decrease the rate of heat evolution during substrate oxidation at concentrations at which the rate of oxygen uptake was not depressed, with the consequences that free-energy efficiency was apparently increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00412842
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  • 8
    Electronic Resource
    Electronic Resource
    Interprétation structurale des spectres hyperfins des radicaux libres et méthodes de chimie quantique (1965)
    Springer
    Theoretical chemistry accounts 3 (1965), S. 213-230 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Estimation of the electron-nuclear hyperfine coupling constants from molecular wave functions is discussed on the example of nitroxide free radicals. A new method of calculation, which is derived from self-consistent field theories, is used to determine both π and σ molecular orbitals in these compounds. Results agree well with experiment and allow the assignment of some coupling constants in the iminoxyl free radicals (coupling constants of formaldiminoxyl and its syn and anti phenyl derivatives).
    Abstract: Zusammenfassung Die Berechnung der Kopplungskonstanten der Hyperfeinstruktur (Elektron-Kern) aus den molekularen Wellenfunktionen soll am Beispiel der freien Stickstoif-Oxyd Radikale gezeigt werden. Eine von der „self-consistent field theory“ abgeleitete neue Berechnungsmethode wird zur Bestimmung der π und σ Bahnen dieser Verbindungen benutzt. Die theoretischen Ergebnisse sind in guter Übereinstimmung mit dem Experiment und erlauben bei den freien Iminoxyl-Radikalen die Zuordnung einiger Kopplungskonstanten (Kopplungskonstanten a H der Formaldiminoxyl- und seiner syn- und anti-Phenyl-Derivate).
    Notes: Résumé L'évaluation des constantes de couplage hyperfin électron-noyaux à partir des fonctions d'ondes moléculaires est discutée sur l'exemple des radicaux libres nitroxydes. Une méthode de calcul nouvelle, dérivant des théories de champ self-consistant, est utilisée pour la détermination simultanée des orbitales moléculaires affectées aux électrons π et aux électrons σ de ces composés. Les résultats obtenus sont en accord satisfaisant avec l'expérience et permettent l'attribution de certaines constantes de couplage dans les radicaux iminoxyles (constantes de couplage a H du formaldiminoxyle et de ses dérivés phénylés syn et anti).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527717
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  • 9
    Electronic Resource
    Electronic Resource
    A study of a Man-made freshwater reservoir in Eastern Flanders (Belgium), with special reference to the vertical migration of the zooplankton (1968)
    Springer
    Hydrobiologia 32 (1968), S. 97-130 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les migrations verticales de plusieurs espèces d'animaux planctoniques dans un bassin d'eau douce artificiel en basse Belgique font l'objet de cette étude. Deux séries d'observations ont été effectuées, dont la première pendant la période de stratification estivale (30 heures d'observations) et la seconde au cours de la circulation automnale (48 heures d'observations). De nombreuses pèches ont été faites (toutes les trois heures ou toutes les heures et demie), à diverses profondeurs. Simultanément, un nombre de facteurs physico-chimiques, présentant eux aussi un rhythme journalier, ont été déterminés (pH, HCO inf3 sup− , O2, températures). La démonstration des migrations verticales s'est faite à l'aide des techniques de statistique développées essentiellement par Ricker. Des migrations verticales trés prononcées se sont produites pendant la période de stratification. Par contre, pendant l'overturn la structure verticale du plankton était plutôt homogène et les migrations verticales avaient perdu beaucoup de leur netteté. Dans certains cas elles sont peut-être absentes ou camouflées par des mouvements horizontaux. La causalité de cette différence marquante entre les deux périodes de l'année fait l'objet d'une brève discussion.
    Notes: Summary A study is made of the vertical migrations of several zooplankters in a recent artificial freshwater reservoir in the lower part of Belgium. Two series of cyclical observations were made, the first one during summer stagnation (30 hours), the second one during autumn overturn (48 hours). In both cases numerous plankton collections were made at different depths and a number of physico-chemical features of the water, suspected to show a diurnal rhythm too, were determined (temperature, O2, pH, HCO inf3 sup− ). Using the statistical technique basically developed by Ricker, significant vertical migrations were found during the stratification period and for every species that was taken into consideration. During overturn, vertical migrations were much less evident and in some cases even doubtful. The causality of this phenomenon is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179542
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  • 10
    Electronic Resource
    Electronic Resource
    Les Graminees et legumineuses d'interet fourrager a la Station d'Amelioration des Plantes du Centre des Antilles françaises (1965)
    Springer
    Plant foods for human nutrition 12 (1965), S. 48-58 
    Details
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01104449
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