ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Pre-release assessment ofNanaia sp. [Lepidoptera: Phycitidae] fromOpuntia pascoensis for biological control ofOpuntia aurantiaca [Cactaceae] (1988)
    Springer
    BioControl 33 (1988), S. 81-86 
    Details
    ISSN: 1573-8248
    Keywords: Nanaia ; Opuntia ; biocontrol ; evaluation ; host-specificity ; Nanaia ; Opuntia ; lutte biologique ; évaluation ; spécificité vis-à-vis de l'hôte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Nanaia sp. a été récolté surOpuntia pascoensis Britton & Rose au Pérou et introduit en Afrique du Sud pour lutter biologiquement contreOpuntia aurantiaca Lindley. Depuis l'existence de cette nouvelle association Insecte-Plante, les chances d'une lutte biologique efficace pourraient être théoriquement augmentées. Cependant, les études de laboratoire avant lâcher montraient les effets adverses de l'élevage de laboratoire, le développement larvaire était plus lent, la survie larvaire était diminuée, des adultes plus petits apparaissaient et la reproduction était supprimée surO. aurantiaca par rapport àO. pascoensis. La nouvelle associationNanaia sp./O. aurantiaca ne sera probablement pas vouée au succès, bien que des essais de plein champ devraient être développés pour le confirmer, un vaste programme d'élevage et de lâcher serait une perte de temps et un gaspillage d'argent et d'effort.
    Notes: Abstract Nanaia sp. was collected onOpuntia pascoensis Britton & Rose in Peru and introduced into South Africa for biological control ofOpuntia aurantiaca Lindley. Since this is a new insect-plant association the chances of successful biological control could theoretically be enhanced. However, pre-release insectary studies showed that apart from the adverse affects of insectary rearing, larval development was slower, less larvae survived, smaller adults emerged and reproduction was suppressed onO. aurantiaca compareded toO. pascoensis. The new association ofNanaia sp. onO. aurantiaca will probably not succeed and, although field trials should be conducted to confirm this, an extensive mass-rearing and release programme would be a waste of time, finances and effort.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372316
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Evidence for stratospheric nitric acid condensation from balloon and rocket measurements in the Arctic (1989)
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 493-497 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Strong evidence for nitric acid condensation at altitudes of about 18–23 km is provided by balloon-and rocket-borne measurements made near Kiruna, northern Sweden, in January 1989. Nitric acid con-densation is believed to be a necessary step in the chemical pre-conditioning required for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/342493a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The147Sm(n,α)144Nd Reaction on 2 keV neutrons (1980)
    Springer
    The European physical journal 294 (1980), S. 197-198 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a scandium neutron filter the spectrum ofα-particles from147Sm(n, α) reaction at neutron energies around 2 keV has been measured. The partialα-widths averaged over the capturing compound states for twoα-transitions have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435056
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The147Sm (n, α)144Nd reaction on 2 keV neutrons (1980)
    Springer
    Czechoslovak journal of physics 30 (1980), S. 996-1001 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a scandium neutron filter the α-particle transitions from147Sm (n, α)144Nd at 2 keV neutrons have been measured. For the α-transitions from the excited states of148Sm to the ground state of $$^{144} Nd{\rm{ }}\bar \Gamma _\alpha = (5 \cdot 3{\rm{ }} \pm {\rm{ }}1 \cdot 4){\rm{ }} \times {\rm{ }}10^{ - 6}$$ eV has been obtained while for the transitions to the first excited state of $$^{144} Nd{\rm{ }}\bar \Gamma _\alpha = (1 \cdot 3{\rm{ }} \pm {\rm{ }}0 \cdot 3){\rm{ }} \times {\rm{ }}10^{ - 6}$$ eV. The statistical model analysis for description of α-decay of highly excited states has been used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596172
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Temperature-programmed desorption (TPD) studies of the deammoniation kinetics of NH4NaY zeolites using a hyperbolic temperature programme (1983)
    Springer
    Journal of thermal analysis and calorimetry 27 (1983), S. 353-357 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei TPD-Untersuchungen zur Kinetik der Deammonisierung eines NH4NaY-Zeolithen konnte gezeigt werden, dass die Verwendung eines hyperbolischen Temperaturprogrammes zu mit der linearen Temperaturführung übereinstimmenden kinetischen Parametern führt. Wegen der progressiven Zunahme der Aufheizgeschwindigkeit bei diesem Temperaturprogramm können somit die Parameter als in gewissen Grenzen unabhängig davon betrachtet werden. Und nicht zuletzt sollte die beobachtete bessere Auflösung komplexer Desorptionsspektren Grund dafür Scin, diese nichtlineare Temperaturführung bei TPD-Untersuchungen mit zu berücksichtigen.
    Abstract: Резюме В исследованиях мето дом термодесорбции кинетики десорбции а ммиака с NH4NaY-цеолита было показа но, что применение гиперболической тем пературной программ ы приводит к кинетичес ким параметрам, соотв етствующим линейной программе. Из-за прогрессирующе го роста скорости про грева при такой температурной программе, параметры могут быть рассмотрены в опреде ленных пределах независимы ми от вида программы. Наблюдаем ое лучшее разрешение комплексных десорбционных спект ров, не в последнюю очеред ь, является поводом, чт обы обратить внимание на такой нелинейный температурный режим при исследованиях ме тодом термодесорбции.
    Notes: Abstract TPD studies on the kinetics of deammoniation of an NH4NaY zeolite showed that the use of a hyperbolic temperature programme led to kinetic parameters agreeing with those resulting from a linear heating process. Because of the progressive increase of the heating rate in the case of hyperbolic heating schedules, the parameters can be considered as independent of the heating rate within certain limits. The better resolution of complex desorption spectra with hyperbolic programmes is an additional reason for their use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914672
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Study of complex desorption processes on porous catalysts by means of temperature-programmed desorption (TPD) with non-linear temperature programmes (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 801-806 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Durch Simulationsrechnungen für ein einfaches Modell der Desorption von Adsorptionsplätzen verschiedener Stärke kann gezeigt werden, daß bei Verwendung nichtlinearer Temperaturprogramme auftretende Desorptionsmaxima der komplexen Desorptionskurve besser erkennbar sind Da bei nichtlinearer Temperaturführung die Überlagerung mehrerer Prozesse geringer ist, können die Aktivierungsparameter der einzelnen Prozesse näherungsweise aus der komplexen Desorptionskurve ermittelt werden.
    Abstract: Резюме Посредством моделир ования ТПД модельных кривых десорбции для адсорбционных участков различной с илы, было показано, что использование нелин ейных температурных программ затрагивае т сложный адсорбцион ный процесс таким образом, что появляющиеся десорб ционные максимумы ст ановятся более видимыми. Испол ьзование нелинейных температ урных программ приво дит к меньшему перекрыван ию различных дeсорбционных процес сов, вследствии чего представляется возм ожным, исходя из комплексной кривой д есорбции, приблизите льно оценить активационные парам етры отдельных стадий реа кции.
    Notes: Abstract Through simulation of TPD model curves for desorption from adsorption sites of different strength could be shown that the use of non-linear temperature programmes influences the complex desorption process in such a manner that the appearing desorption maxima are better visible. Because in case of using non-linear temperature programmes the overlapping of different desorption processes is smaller it is possible to evaluate approximately the activation parameters for the single steps from the complex desorption curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913539
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Temperature-Programmed Desorption (TPD) of ammonia from H+-exchanged zeolites with different structures (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 933-940 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Kurven der temperaturprogrammierten Desorption (TPD) des Ammoniak von Zeolith wurden mit verschiedenen Kinetischen Modellen ausgewertet. Ein annähernd linearer Zusammenhang wurde gefunden zwischen der Aktivierungsenergie der Desorption bzw. der Adsorptionswärme von NH3 an H-Zeolithen mit unterschiedlichem Si/Al-Verhältnis und der intermediären Elektronegativität der Zeolithe, die ein mass für die Säurestärke darstellt. Dieses Ergebnis entspricht der Verschiebung der hochfrequenten IR-Bande der OH-Gruppen und der mikrokalorimetrisch bestimmten Änderungen der Adsorptionswärme. Damit erweist sich die TPD von NH3 als brauchbare Methode zur quantitativen Charakterisierung der sauren Eigenschaften von H-Zeolithen.
    Abstract: Резюме С помощью нескольких кинетических моделе й проведена оценка кри вых температурно-програ ммируемой десорбции аммиака из цеолитов. Установлен а приблизительно линейная корреляция между энергией актив ации процесса десорбции и ли тепловой адсорбции Н-цеолитов с различным соотноше нием Si/Al и промежуточной элект роотрицательностью цеолитов,являющейся мерой их кислотности. Этот результат соответст вует изменению высокочастотной ИК п олосы поглощения ОН г рупп,а также изменению теплоты ад сорбции,найденной с помощью м икрокалориметрии. Следовательно,метод температурно-програ ммируемой десорбции аммиака яв ляется полезным мето дом количественной хара ктеристики кислотных свойств не которых Н-цеолитов.
    Notes: Abstract Curves of the temperature-programmed desorption (TPD) of ammonia from zeolites were evaluated with several kinetic models. An approximately linear correlation was found between the activation energy of desorption or the heat of adsorption of H zeolites with various Si/Al ratios and the intermediate electronegativity of the zeolites, the latter representing a measure of the acid strength. This result corresponds to the change in the high-frequency infrared band of the OH groups and also to the change in the heat of adsorption, determined by microcalorimetry. Thus, the TPD of NH3 is a useful technique for quantitative characterization of the acidic properties of several H zeolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138612
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Temperature-programmed desorption (TPD) of ammonia from the H form of a mordenite after different pretreatment temperatures (1987)
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 2009-2014 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde die Temperatur-Programmierte Desorption von Ammoniak an der H-Form eines Mordenits nach Vorbehandlung bei unterschiedlichen Temperaturen untersucht. Es konnte gezeigt werden, daß damit eine quantitative Erfassung der Anzahl der sauren OH-Gruppen möglich ist. Außerdem erhält man aus den Desorptionskurven Hinweise über die Veränderung der sauren Eigenschaften in Abhängigkeit von der Vorbehandlungstemperatur.
    Abstract: Резюме Иучена температурно-программная десорбц ия аммиака на Н-форме мор денита, предварительно обра ботанного при различ ных температурах. Показа на возможность количественного опр еделения кислотных О Н групп. Кроме того, данные пол ученные на основе кривых десорбции ука зывают на изменение к ислотных свойств морденита в з ависимости от температуры его обра ботки.
    Notes: Abstract Temperature-programmed desorption of ammonia from the H form of a modernite was carried out after pretreatment at different temperatures. It could be shown that a quantitative registration of the acidic OH groups is possible. Moreover, from the desorption curves, information is obtained about the alteration of the acidic properties as a function of the temperature of pretreatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913993
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Channeling measurement of residual damage in silicon (1985)
    Springer
    Czechoslovak journal of physics 35 (1985), S. 465-468 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusion The present resulte are in general agreement with those obtained earlier, e.g. in /2/. The complete removal of post-implantation defects in As-implanted Si may be achieved by thermal annealing at temperatures above 700°C and by laser annealing as well. More than 50% of the implanted As atoms enter the host lattice sites during the thermal annealing. By laser annealing, on the other hand, 9056 of the As atoms become substitutional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01604491
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Modifizierter Einsatz für Druck-Aufschluß-Bomben zur kontaminationsarmen Spurenelementbestimmung (1986)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 325 (1986), S. 297-297 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498178
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...