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  • 1
    Electronic Resource
    Electronic Resource
    The use of nifurpirinol in the control of chilodonelliasis and ichthyophthiriasis in species of Colombian cold water fish (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 3 (1980), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1980.tb00440.x
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  • 2
    Electronic Resource
    Electronic Resource
    On the continuation of the — gradE flow ofH 1 (S 1,M) (1980)
    Springer
    Archiv der Mathematik 34 (1980), S. 140-142 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01224944
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  • 3
    Electronic Resource
    Electronic Resource
    The applicability of DTA and DSC techniques to the study of the kinetics of phase transition reactions (1982)
    Springer
    Journal of thermal analysis and calorimetry 24 (1982), S. 23-34 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Differentialthermoanalyse und DSC wurden zur Untersuchung der Kinetik von Phasenübergängen eingesetzt. Die Umwandlung Aragonit/Calcit wurde als Testreaktion gewählt. Bedeutende Diskrepanzen wurden zwischen den kinetischen Ergebnissen der DTA und den durch isotherme kinetische Messungen erhaltenen Ergebnissen beobachtet. Diese Abweichungen sind damit verbunden, daß es schwierig ist, die Reaktionsgeschwindigkeit des Vorgangs aus einer DTA-Kurve genau zu ermitteln. Bei DSC-Messungen,wo die Reaktionsgeschwindigkeit durch die Höhe des Peaks von der Grundlinie gegeben ist, kann eine befriedigende Anpassung der Daten erhalten werden, und die durch diese Technik erhaltenen kinetischen Ergebnisse sind in guter Übereinstimmung mit den isothermen Ergebnissen.
    Abstract: Резюме Для изучения кинетик и фазовых переходов б ыли использованы диффер енциа льный термический ан ализ и дифференциаль ная сканирующая калорим етрия. В качестве испытательной реакции было взято фа зовое превращение арагони т/кальцит. Зам етные различия наблю дались между кинетич ескими результатами, получе нными на основе ДТА и изотермических измерений. Такое разп огласие обусловлено труднос тью точного определения констан ты скорости процесса превращения из ДТА-кривых. Наоборо т, при ДСК измерениях, где ск орость реакции опред еляется высотой пика от базис ной линии, представляется возм ожным получить удовлетворительное совпадение данных и в связи с чем кинетические рез ультаты, полученные э тим методом, хорошо согласуются с изотермическими данными.
    Notes: Abstract Differential thermal analysis and differential scanning calorimetry techniques have been used to study the kinetics of phase transitions. The aragonite/calcite transformation was chosen as test reaction. Marked discrepancies were observed between the DTA kinetic results and those obtained from isothermal kinetic measurements. This disagreement is associated with the difficulty of determining accurately the reaction rate of the process from a DTA curve. In contrast, in DSC measurements, where the reaction rate is given by the height of the peak from the base-line, it is possible to get a satisfactory fit of the data, and the kinetic results obtained with this technique are in good agreement with the isothermal ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914796
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic study of the thermal decomposition of cobalt(III) oxyhydroxide (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 479-489 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kinetik der thermischen Zersetzung von CoOOH wurde durch Analyse von im Vakuum unter isothermen Bedingungen erhaltenen Gewichtsverlustkurven untersucht. Ein Vergleich der linearen Korrelationskoeffizienten von verschiedenen auf diese Kurven angewandten kinetischen Ausdrücken trägt nicht zum Verständnis des Mechanismus bei, auch nicht bei Ausführung von Signifikanztesten (t-Test). Aus den Arrhenius-Diagrammen wird stets der gleiche Wert für die Aktivierungsenergie (193 kJ · mol−1) erhalten, der verhältnismäßig unabhängig von der Wahl des Geschwindigkeitsgesetztes ist. Andererseits kann eine Änderung des Mechanismus der Bildung von Co3O4 mit der Temperatur nicht durch Analyse der isothermen Daten agbeleitet werden. Die Feststellung einiger Autoren, daß es moglich sei, den Protonen- und Elektronenübergang bei Umwandlungen aus der formalen Kinetik zu erkennen, kann somit nicht akzeptiert werden.
    Abstract: Резюме Кинетика реакции тер мического разложени я СоООН исследована на основе анализа данных по изотермиче ской потери веса в вак ууме. Сопоставление линей ных коэффициентов корреляции различны х кинетических уравн ений, используемых для ана лиза этих данных, не позволило п онять механизм разло жения даже при проведении смысл овых проверок (t апробиров ание). Единственное зн ачение энергии активации (193 кд ж/моль), полученное на основе aррениусовских графи ков, было относительно незави симым от выбора закона скорос ти. С другой стороны, из менение с температурой механи зма образования Со3O4 не может быть уста новлено на основе ана лиза изотермических данн ых. Таким образом, заявле ние некоторых авторо в о том, что исходя из формальной кинетики представляется возм ожным различать пере нос протона и электрона в реакции п ревращения, становится несостоя тельным.
    Notes: Abstract The kinetics of thermal decomposition of CoOOH have been studied by analysis of isothermal weight loss data under vacuum. The comparison of linear correlation coefficients of different kinetic expressions applied to these data does not allow an understanding of the mechanism, even when significance tests are performed (t test). A single value of the activation energy (193 kJ mol−1) is obtained from the Arrhenius plots, and is relatively independent of the choice of rate law. On the other hand, a change in the mechanism of formation of Co3O4 with temperature cannot be inferred from analysis of isothermal data. Thus, the statement of some authors that from formal kinetics it is possible to distinguish the proton and electron transfers involved in the transformation appears unacceptable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913457
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic study of the thermal decomposition of cobalt(III) oxyhydroxide (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 491-501 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kinetik der thermischen Zersetzung von CoOOH im Vakuum wurde durch Analyse von dynamischen Gewichtsverlustdaten untersucht. Der Vergleich der Werte der durch verschiedene Methoden der Analyse von thermogravimetrischen und unter isothermen Bedingungen erhaltenen Daten läßt ein Gesetz erster Ordnung als den für die Reaktion am besten geeignetsten Mechanismus erkennen. Trotzdem ist keine klare Unterscheidung zwischen diesem Modell und auf geometrischen Gleichungen basierenden Modellen möglich. Die den Verlauf dieser Reaktion bestimmende formale Kinetik wurde auf der Basis der Röntgenprofilanalyse und elektronenmikroskopischer Ergebnisse ermittelt. Der Reaktion scheint ein statistischer Keimbildungsprozeß zugrunde zu liegen, der zur Bildung von kohärente Streubereiche von 50–100 nm begrenzenden Sprüngen führt. Dem Auftreten solcher isolierter Blöcke mag zuzuschreiben sein, daß die Zersetzungsgeschwindigkeit der Menge an unzersetztem Reaktant proportional ist.
    Abstract: Резюме Кинетика реакции тер мического разложени я СоООН в вакууме была и зучена на основе анализа дан ных динамической пот ери веса. Сопоставление значе ний энергий активации, вычисленн ых на основе различны х методов анализа данных ТГ, с по лученными в изотермических усл овиях, позволило обна ружить закон первого порядк а, как наиболее приемлемый механизм реакции. Однако, нет яс ного различия между этой м оделью и моделями, основанным и на геометрических у равнениях. Такая избирательнос ть формальной кинетики была устано влена на основании ан ализа профиля рентгеновск их лучей и электронной микроск опии. Исследованная р еакция сопровождается проц ессом произвольного образования центров кристаллизации, прив одящих к образованию трещин, которые рождают коге рентно-рассеивающие домены размера 5–10 нм. Появлени е этих изолированных блоко в может объяснить ско рость разложения пропорци ональную количеству вещества, не подвергш егося разложению.
    Notes: Abstract The kinetics of thermal decomposition of CoOOH under vacuum have been studied by the analysis of dynamic weight loss data. The comparison of the values of activation energy computed from the application of different methods of TG data analysis and those obtained in isothermal conditions, allows to detect a first order law as the most suitable mechanism for the reaction. Nevertheless, there is no clear differentiation between this model and those based in contracting geometry equations. The discrimination of the formal kinetics governing this reaction has been made on the basis of X-ray profile analysis and electron microscopy results. The reaction seems to occur by a random nucleation process that leads to the formation of cracks, which confine coherently scattering domains of 50–100 Å. The occurrence of these isolated blocks might account for a rate of decomposition proportional to the amount of undecomposed reactant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913458
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  • 6
    Electronic Resource
    Electronic Resource
    Critical examination of the DTA techniques used to study the kinetics of solid-state transformations (1983)
    Springer
    Journal of materials science 18 (1983), S. 2117-2125 
    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 use of the different equations proposed to study the kinetics of the glass-to-crystal transition from DTA curves has been extended to include the evaluation of the kinetic parameters of polymorphic transitionS. The transformation kinetics of CaCO3 (aragonite to calcite) and PbO (litharge to massicot) are the examples studied. The kinetic results of both transformations, obtained by the analysis of DTA curves, differ widely from those revealed by the analysis of the isothermal kinetic data. This discrepancy is probably due to erroneous simplifications used in deriving the equations applied in non-isothermal conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555006
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  • 7
    Electronic Resource
    Electronic Resource
    Algebraic approach to one- and two-center harmonic oscillator integralsThis work was partially supported by CONACYT-MEXICO PVT/EN/NAL81/1557. (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 26 (1984), S. 57-60 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A second-quantization formalism is used to derive closed formulas for one- and two-center matrix elements of two harmonic oscillators with different force constants. The method is based on a linear transformation between the creation and annihilation operators of the two harmonic oscillators, the use of the Baker-Campbell-Hausdorff theorem, and Cauchy's integral formula. As presented, the proposed procedure is considerably simpler than the ones hitherto employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560260809
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  • 8
    Electronic Resource
    Electronic Resource
    ESCA Peak intensities in the dipole and generalized sudden approximations using fourier transforms of GTO'sWork partially supported by CONACYT (PNCB-1469). (1983)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 23 (1983), S. 417-423 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analytical expressions for the square of the spherical average of Fourier transforms of Gaussian type orbitals (GTO's) are given. A direct application of these expressions to the calculation of molecular photoionization cross sections is considered under the generalized sudden (GSA) and dipole (DA) Approximations. Numerical calculations were done on the CO molecule using bound orbitals obtained by ab initio LCAO-MO calculations with Gaussian basis sets. The results are in good agreement with experiments. Those obtained by the GSA method however, suggest a limitation in its use: the GSA method is only applicable when comparing photoionization intensities of neighboring ionization energy orbitals. Applications to other molecules are immediate.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560230210
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  • 9
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    Observations of volcanic earthquakes and tremor at Deception Island - Antarctica (2006)
    Details
    Publication Date: 2019-11-04
    Description: Deception Island - South Shetlands, Antarctica is site of active volcanism. Since 1988 field surveys have been carried out with the aim of seismic monitoring, and in 1994 a seismic array was set up near the site of the Spanish summer base in order to better constrain the source location and spectral properties of the seismic events related to the volcanic activity. The array was maintained during the Antarctic summer of 1995 and the last field survey was carried out in 1996. Data show the existence of three different groups (or families) of seismic events: 1) long period events, with a quasi-monochromatic spectral content (1-3 Hz peak frequency) and a duration of more than 50 s, often occurring in small swarms lasting from several minutes to some day; 2) volcanic tremor, with a spectral shape similar to the long period events but with a duration of several minutes (2-10); 3) hybrid events, with a waveform characterised by the presence of a high frequency initial phase, followed by a low frequency phase with characteristics similar to those of the long period events. The high frequency phase of the hybrid events was analysed using polarisation techniques, showing the presence of P waves. This phase is presumably located at short epicentral distances and shallow source depth. All the analysed seismic events show back-azimuths between 120 and 330 degrees from north (corresponding to zones of volcanic activity) showing no seismic activity in the middle of the caldera. Particle motion, Fourier spectral and spectrogram analysis show that the low frequency part of the three groups of the seismic signals have similar patterns. Moreover careful observations show that the high frequency phase which characterises the hybrid events is present in the long period and in the tremor events, even with lower signal to noise ratios. This evidence suggests that long period events are events in which the high frequency part is simply difficult to observe, due to a very shallow source and/or hypocentral distance higher than that of hybrids, while the tremor is composed of rapidly occurring hybrid events. We propose a possible interpretation for the three groups of seismic events. These may be generated by multiple pressure-steps due to the rapid phase change from liquid to vapour in a shallow aquifer which comes in contact with hot materials. The pressure change can put a crack in resonance or excite the generation of multiple surface waves modes in the shallow layered structure.
    Description: JCR Journal
    Description: open
    Keywords: volcanic earthquakes ; tremor ; antartica ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    Kinematics of the Iberia-Maghreb plate contact from seismic moment tensors and GPS (2007)
    Elsevier
    Details
    Publication Date: 2021-09-03
    Description: The Iberian Peninsula and the Maghreb experience moderate earthquake activity and oblique, ∼ NW–SE convergence between Africa and Eurasia at a rate of ∼ 5 mm/yr. Coeval extension in the Alboran Basin and a N35°E trending band of active, left-lateral shear deformation in the Alboran–Betic region are not straightforward to understand in the context of regional shortening, and evidence complexity of deformation at the plate contact. We estimate 86 seismic moment tensors (MW 3.3 to 6.9) from time domain inversion of near-regional waveforms in an intermediate period band. Those and previous moment tensors are used to describe regional faulting style and calculate average stress tensors. The solutions associated to the Trans-Alboran shear zone show predominantly strike-slip faulting, and indicate a clockwise rotation of the largest principal stress orientation compared to the regional convergence direction (σ1 at N350°E). At the N-Algerian and SW-Iberian margins, reverse faulting solutions dominate, corresponding to N350°E and N310°E compression, respectively. Over most of the Betic range and intraplate Iberia, we observe predominately normal faulting, and WSW–ENE extension (σ3 at N240°E). From GPS observations we estimate that more than 3 mm/yr of African (Nubian)–Eurasian plate convergence are currently accommodated at the N-Algerian margin, ∼ 2 mm/yr in the Moroccan Atlas, and ∼ 2 mm/yr at the SW-Iberian margin. 2 mm/yr is a reasonable estimate for convergence within the Alboran region, while Alboran extension can be quantified as ∼ 2.5 mm/yr along the stretching direction (N240°E). Superposition of both motions explains the observed left-lateral transtensional regime in the Trans-Alboran shear zone. Two potential driving mechanisms of differential motion of the Alboran–Betic–Gibraltar domain may coexist in the region: a secondary stress source other than plate convergence, related to regional-scale dynamic processes in the upper mantle of the Alboran region, as well as drag from the continental-scale motion of the Nubian plate along the southern limit of the region. In the Atlantic Ocean, the ∼ 3.5 mm/ yr, westward motion of the Gibraltar Arc relative to intraplate Iberia can be accommodated at the transpressive SW-Iberian margin, while available GPS observations do not support an active subduction process in this area.
    Description: Published
    Description: 295-317
    Description: JCR Journal
    Description: reserved
    Keywords: GPS ; Kinematics ; 04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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