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  • 1
    Electronic Resource
    Electronic Resource
    Metal-promoted cyclization. 28. Regioselective and diastereoselective alkyl-alkene and alkene-alkene coupling promoted by zirconocene and hafnocene (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 3521-3523 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00276a006
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  • 2
    Electronic Resource
    Electronic Resource
    Peculiar cases of intracardiac parasitism in the pilchard, Sardina pilchardus (Walbaum), by a pennellid copepod belonging to the genus Lernaeenicus (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 12 (1989), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. The pilchard, Sardina pilchardus (Walbaum), is parasitized in coastal waters in the Languedoc-Roussillon region (South of France) by a copepod species which belongs to the genus Lernaeenicus (Siphonostomatoida, Pennellidae). These mesoparasites become established in various parts of the body of the host (eye, lateral muscle or muscle at the bases of fins). Examination of specimens which had penetrated at the root of pectoral fins revealed that some had penetrated the heart. A curious case of transcardiac parasitism was observed. Host tissue reactions caused by the presence of parasites are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1989.tb00311.x
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  • 3
    Electronic Resource
    Electronic Resource
    A pulsed thermoelastic analysis of photothermal surface displacements in layered materials (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4396-4405 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A pulsed photothermal method is proposed for the detection of delaminations in layered materials. The surface of the material is heated by a focused laser pulse to a few degrees above the ambient temperature, and the induced thermoelastic displacement is detected by a laser interferometer. Unbonded areas are characterized by their thermoelastic bending behavior, in addition to their thermal expansion, because of the induced temperature gradients both in the radial and axial directions. A theoretical analysis and an experimental investigation of this behavior are described in order to point out the most significant parameters. An application of the nondestructive inspection of Al-epoxy honeycomb panels is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334600
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  • 4
    Electronic Resource
    Electronic Resource
    On the consistency of knowledge bases: the COVADIS system (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Computational intelligence 4 (1988), S. 0 
    Details
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: It is currently thought in the knowledge-based systems (KBS) domain that sophisticated tools are necessary for helping an expert with the difficult task of knowledge acquisition. The problem of detecting inconsistencies is especially crucial. The risk of inconsistencies increases with the size of the knowledge base; for large knowledge bases, detecting inconsistencies “by hand” or even by a superficial survey of the knowledge base is impossible. Indeed, most inconsistencies are due to the interaction between several rules via often deep deductions. In this paper, we first state the problem and define our approach in the framework of classical logic. We then describe a complete method to prove the consistency (or the inconsistency) of knowledge bases that we have implemented in the COVADIS system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-8640.1988.tb00119.x
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  • 5
    Electronic Resource
    Electronic Resource
    Esr characterization and thermal transformations of Fe(III) ions in active aluminas derived from mixed oxalato precursors (1987)
    Springer
    Journal of materials science 6 (1987), S. 1167-1172 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729171
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  • 6
    Electronic Resource
    Electronic Resource
    An investigation of the γ-Fe2O3+H2O system heated under high pressure (1989)
    Springer
    Journal of materials science 8 (1989), S. 212-213 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730729
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  • 7
    Electronic Resource
    Electronic Resource
    Detailed gravity study of the offshore structure of Piton de la Fournaise volcano, Reunion Island (1987)
    Springer
    Bulletin of volcanology 49 (1987), S. 713-722 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract We present an interpretation of gravity data acquired in 1984 by the French R/V Jean Charcot on the submarine part of the eastern flank of Piton de la Fournaise volcano. We comment on the Bouguer anomaly map and give a quantitative interpretation of three gravity profiles. The main results are that a gravity high over Grand Brûlé, the lower subaerial part of the eastern flank, does not extend far offshore and that an anomalous topographic feature, discovered in 1982 on the submarine eastern flank, is characterized by a large negative anomaly. We propose three hypotheses to explain the origin of this anomaly, i. e., it marks the site of a new volcano, or it is a consequence of lateral volcanism from a volcano older than Piton de la Fournaise, or more probably, it represents a great landslide deposit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01079822
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  • 8
    Electronic Resource
    Electronic Resource
    ESR examination of thermally treated Fe (III) coprecipitated with Al(OH)3·nH2O (1985)
    Springer
    Journal of materials science 4 (1985), S. 1403-1406 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720112
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  • 9
    Electronic Resource
    Electronic Resource
    Thermoanalytical studies on cation distribution in submicronic titanomagnetites (1987)
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 845-855 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über nicht-isotherme und isotherme TG-Untersuchungen der Kationenverteilung in submikronen Titanomagnetiten (Fe3−x Ti x O4 mit 0〈x〈0.82) berichtet. Titanomagnetite mitx〈0.61 konnten unter 500° zu Titan-substituierten Magnetiten oxydiert werden, die eine größere Leerstellenkonzentration alsγ-Fe2O3 aufweisen. Die DTA-Ergebnisse zeigen, daß die zur Oxydation von Fe2+- zu Fe3+-Ionen notwendige Temperatur mit zunehmender Titansubstitution ansteigt, die Phasenübergangstemperatur dagegen absinkt. Die Kinetik der Oxydation ist unter verschiedenen Arbeitsbedingungen und bei unterschiedlichen Konzentrationen der an der Fest-Gas-Grenzfläche gebildeten Fehlstellen diffusionsbestimmt. Die Aktivierungsenergie der Diffusion von an den oktaedrischen Stellen lokalisierten Fe(II)-Ionen ist geringer als die von tetraedrisch koordinierten Fe(II)-Ionen. Diffusionsgeschwindigkeiten werden als von der Konzentration abhängig erkannt und die Variationen können mit der Verteilung der Eisenionen im Subgitter identifiziert werden.
    Abstract: Резюме Проведено неизотерм ическое и изотермиче ское ТГ исследование расп ределения катионов в субмикрон ных титаномагнетита х состава Fe3−x Ti x O4 c 0〈x〈0.82. Титаномагне титы составаx〈 0.61 при темпер атурах ниже 500° окисляю тся до титанозамещенных ма гнетитов, содержащих более выс окую концентрацию ва кансий по сравнению сγ-Fe2O3. Резул ьтаты ДТА исследований показа ли, что температура ок исления двухвалентного желе за до трехвалентного увеличивается с увел ичением содержания т итана, тогда как температура фазо вого изменения уменьшается. Установ лено, что кинетика оки сления подчиняется закону д иффузии для переменных эксперим ентальных условий и д ля различных степеней образовани я вакансий на границе раздела твер дое тело — газ. Диффузи я ионов двухвалентного желе за, расположенных в октаэдрических узла х решетки, протекает с более низкой энергией акти вации по сравнению с ионами железа в тетра эдрических узлах реш етки. Скорости диффузии за висят от состава веществ, что может быт ь связано с распредел ением ионов железа в подрешетках.
    Notes: Abstract Non-isothermal and isothermal TG studies on the cation distribution in submicronic titanomagnetites; Fe3−xTixO4 with 0〈x〈0.82 are reported. For x〈0.61, these titanomagnetites could be oxidized at temperatures below 500° to titanium-substituted magnetites which have a higher vacancy content than that of γ-Fe2O3. The DTA results show that the temperature of oxidation of Fe2+ to Fe3+ ions is increased, whereas the temperature of phase change is decreased with increasing titanium substitution. The kinetics of oxidation is found to be governed by the law of diffusion for variable working conditions and for different extents of the vacancies created at the solid-gas interface. The diffusion of iron(II) ions located at octahedral sites proceeds with a lower activation energy than that of iron(II) ions located at tetrahedral sites. Diffusion rates were discerned to be composition-dependent and the variations can be identified with the distribution of the iron ions in sublattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913770
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  • 10
    Electronic Resource
    Electronic Resource
    Size- and surface-dependence of enthalpy of oxidation of submicronic magnetites (1987)
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 865-871 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach zwei verschiedenen Methoden hergestellte, submikrone Magnetite werden zwischen 30 und 280° mittels eines fluxometrischen Mikrokalorimeters untersucht, um die Abhängigkeit der EnthalpieΔH der Oxydation von Magnetit zuγ-Fe2O3 von der Partikelgröße und -Oberfläche zu ermitteln. Für Partikel mit mittleren Durchmessern im Bereich von 95 Å bis 950 Å bzw. spezifischen Oberflächen in der Größenordnung von 100-10 m2/g variieren dieΔH-Werte von −77,3 ±2,5 kJ/mol bis −61,0±2,5 kJ/mol. Die Enthalpie korreliert linear mit der Partikelgröße, was durch die BeziehungΔH=ΔH intrinsic+ΔH D ausgedrückt werden kann, worinΔH D den von der Partikelgröß e abhängigen Teil der Oxydationsenthalpie repräsentiert.
    Abstract: Резюме Магнетиты, полученны е двумя разными метод ами, были изучены в интерв але температур 30–280° с помо щью микрокалориметр а теплового потока с целью опреде ления зависимостиΔH от рав мера и поверхности ча стиц, а также энтальпии окис ления магнетита доγFe2O3. Для частиц со средним диаметром от 95 до 950 Å и с у дельной поверхностью, соответственно, от 100,0 д о 10,0 м2/r, значенияΔH изменялись от −77,3±2,5 до −61,0±2,5 кдж/моль. ПараметрΔH является линейной функцией размера час тиц и описывается соотношениемΔH=ΔH вну тр+ΔH д, гдеΔH д — предс тавляет часть энтальпии окис ления, зависящей от размера частиц.
    Notes: Abstract Submicronic magnetites prepared by two different methods were studied between 30 and 280°, using a fluxmetric microcalorimeter to investigate the size- and surface-dependence ofΔH, the enthalpy of oxidation of magnetite toγ-Fe2O3. For the particles with mean diameters ranging from 95 to 950 Å and specific surfaces of the order of 100.0 to 10.0 m2/g,ΔH varied from −77.3±2.5 to −61.0±2.5 kJ/mol, and is identified as a linear function of the size of the particles, as depicted by the relationshipΔH=ΔH intrinsic+ΔH D, whereΔH D represents the particle size-dependent part of the enthalpy of oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913772
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