ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    ISSN: 1436-5073
    Keywords: thin layer chromatography ; diffuse reflectance infrared spectrometry ; drug analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The technique of diffuse reflectance Fourier transform infrared spectrometry (DRIFT) as an in situ detection method was used for the qualitative and quantitative analysis of drugs (heroin, cocaine and codeine) separated by thin layer chromatography. It was found that at a given interferometer throughput and detector sensitivity the quality of the spectrum depends strongly in the type of the chromatographic thin layer used. A detection limit of approx. 2 μg was attained on a microcrystalline cellulose thin layer with a dynamically aligned Bio-Rad Digilab FTS 60A/896 type interferometer and room temperature DTGS detector. A reliable qualitative analysis can be made with as little as 10 to 15 μg drug per spot.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of economics 42 (1982), S. 191-206 
    ISSN: 1617-7134
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    facet.materialart.
    Unknown
    Wien : Periodicals Archive Online (PAO)
    Journal of economics/Zeitschrift für Nazionalökonomie. 42 (1982) 197 
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 1895-1909 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die hydrothermischen und Zersetzungsreaktionen verschiedener Gibbsitproben und deren Reaktionsprodukten untersucht. Die Proben wurden unter hydrothermischen Bedingungen oder in Luft isothermisch behandelt, die Produkte mittels TG und IR beschrieben. Es wurde festgestellt, da\ Art und Weise der Zerkleinerung und Korngrö\e des Gibbsit-Ausgangsmateriales die ReaktivitÄt von Gibbsit selbst, aber auch die der primÄren Reaktionsprodukte beeinflu\t. In spÄteren Schritten des Reaktionsverlaufes (hydrothermische Rehydratation von-Aluminiumoxid) besitzen Unterschiede in den Eigenschaften des Gibbsit-Ausgangsmateriales keinen Einflu\.
    Notes: Abstract The hydrothermal and decomposition reactions of differently ground gibbsite and its reaction products were studied. The samples were treated isothermally under hydrothermal conditions or in air, and the products were characterized by thermogravimetry and IR spectroscopy. It was found that the method and duration of grinding and the particle size of the starting gibbsite influenced the reactivity of the gibbsite itself and that of the primary reaction products. In a later step of the reaction sequence (hydrothermal rehydration ofγ-alumina), the effects of the differences in the properties of the starting gibbsites were insignificant.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 1147-1151 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine thermo-gasanalytische (EGA-) Methode zur Messung organischer Gase und Dämpfe wurde zur Untersuchung von Betonzusätzen verwendet. Einige kommerzielle Superverflüssiger sowie erhärtete Zementmörtel, die einen derselben in unterschiedlichen Konzentrationen enthalten, wurden untersucht. Die EGA-Kurven bieten einige Informationen zum Nachweis der Zusätze, deren Verhalten in substanzieller Form und im Mörtel jedoch differiert. Die Fläche unter dem EGA-Effekt und charakteristische Intensitäten des EGA-Signals können zur quantitativen Bestimmung der Zusätze im erhärteten Zement genutzt werden.
    Abstract: РЕжУМЕ Дль ИсслЕДОВАНИь РАж лИЧНых ДОБАВОк-пРИсА ДОк Был ИспОльжОВАН МЕтО Д АНАлИжА ВыДЕльУЩЕг Ось гАжА (АВг). БылИ ИжМЕРЕН ы НЕскОлькО пРОДАжНы х плАстИФИкАтОРОВ И тВ ЕРДых цЕМЕНтНых РАстВОРОВ, сОДЕРжАЩИ х В РАжлИЧНОИ кОНцЕНт РАцИИ ОДИН Иж плАстИФИкАтОРОВ. к РИВыЕ АВг ДАУт НЕкОтОРУУ ИН ФОРМАцИУ ОтНОсИтЕль НО ИДЕНтИФИкАцИИ ДОБАВ Ок. ОДНАкО, тЕРМИЧЕскО Е пОВЕДЕНИЕ ДОБАВОк В И х ИсхОДНОИ ФОРМЕ И В ст РОИтЕльНых РАстВОРАх сОВЕРшЕНН О РАжлИЧНОЕ. плОЩАДь кРИВОИ АВг И х АРАктЕРНыЕ ИНтЕНсИВ НОстИ сИгНАлА МОгУт Быть Ис пОльжОВАНы Дль кОлИЧ ЕстВЕННОгО ОпРЕДЕлЕНИь ДОБАВОк В цЕМЕНтНых РАстВОРА х.
    Notes: Abstract An evolved gas analysis method measuring the organic gases and vapours was applied in the investigation of concrete additives. Several commercial superplasticizers and solid cement mortars containing one of them in different concentrations were measured. EGA curves offer some information for the identification of additives, however, the thermal behaviour of the additives in the substantial form and in the mortar is different. The area under the EGA curve and characteristic intensities of the signal may be applied in the quantitative determination of the additives in cement mortars.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 8 (1986), S. 59-71 
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Bei den Anwendungen der linearen Optimierung ist der ökonomische Inhalt der Schattenpreise von Bedeutung. Falls eine optimale Lösung primal entartet ist, sind die Werte der dualen Strukturvariablen im allgemeinen nicht identisch mit den entsprechenden Schattenpreisen, oder — anders ausgedrückt — diese Werte kann man nicht so interpretieren wie bei nichtentarteten optimalen Lösungen eines linearen Optimierungsproblems. Es gibt in der Literatur verschiedene Vorschläge, wie diese Werte interpretiert werden sollen oder wie der „richtige“ Schattenpreis bestimmt werden soll. Dabei werden Bezeichnungen wie „vielseitige“ bzw. „zweiseitige Schattenpreise“ eingeführt. Auch bei der Durchführung einer Sensitivitätsanalyse können im Falle einer primalen Entartung die kritischen Bereiche für Parameter in der rechten Seite oder in den Zielkoeffizienten nicht auf die übliche Weise bestimmt werden. In diesem Artikel ist eine Übersicht des gegenwärtigen Standes zu den obigen Problemen gegeben.
    Notes: Summary In linear programming applications the economic meaning of shadow prices is important. In the case primal degeneracy occurs in the optimal solution, the values of the dual real variables are not, in general, identical with the corresponding shadow prices, or, in other words, these values have not the usual meaning in comparison with LP optimal solutions without primal degeneracy. Several proposals on how to interpret such values or how to find the “true” shadow prices have been made and terms like “many-sided-” or “two-sided-shadowprices” have been coined. Also, when performing sensitivity analysis in the case primal degeneracy occurs, the so called critical ranges of the right hand side or of the objective function coefficients cannot be determined in the usual way. In this paper, a state-of-the-art-survey on these questions is given.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 7 (1985), S. 190-194 
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of optimization theory and applications 45 (1985), S. 577-589 
    ISSN: 1573-2878
    Keywords: Degeneracy ; polytopes ; degenerate extreme points
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Consider an extreme point (EP)x 0 of a convex polyhedron defined by a set of linear inequalities. If the basic solution corresponding tox 0 is degenerate,x 0 is called a degenerate EP. Corresponding tox 0, there are several bases. We will characterize the set of all bases associated withx 0, denoted byB 0. The setB 0 can be divided into two classes, (i) boundary bases and (ii) interior bases. For eachB 0, there is a corresponding undirected graphG 0, in which there exists a tree which connects all the boundary bases. Some other properties are investigated, and open questions for further research are listed, such as the connection between the structure ofG 0 and cycling (e.g., in linear programs).
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 21 (1977), S. B245 
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...