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
    Mesitylene solvated platinum atoms in the preparation of efficient supported catalysts for the dehydrogenation of methylcyclohexane to toluene (1993)
    Springer
    Catalysis letters 17 (1993), S. 151-155 
    Details
    ISSN: 1572-879X
    Keywords: Platinum atoms ; platinum deposition ; methylcyclohexane dehydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mesitylene solvated platinum atoms have been conveniently used for the deposition of active Pt particles on γ-Al2O3 supports. The so prepared catalysts have been compared with traditionally obtained Pt/γ-Al2O3 catalysts in the dehydrogenation of methylcyclohexane to toluene, at 200 and 250 °C, showing, at low Pt loadings, a much greater specific activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763937
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Porous Pt/γ-Al2O3 catalytic membrane reactors prepared using mesitylene solvated Pt atoms (1993)
    Springer
    Catalysis letters 20 (1993), S. 287-297 
    Details
    ISSN: 1572-879X
    Keywords: Membrane reactors ; inorganic membranes ; organic precursors ; solvated platinum atoms ; benzene hydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The opportunity of using mesitylene solvated Pt atoms for the deposition of Pt catalyst on inorganic membranes is shown. The catalytic activity of the membrane reactor has been tested using the hydrogenation of benzene as model reaction. The performance of the membrane reactor has been compared with that of a conventional packed bed using γ-Al2O3 powder impregnated with Pt. The effect of the feeding configuration has been investigated, and the results show a membrane effect due to the different degrees of accessibility of pores of different size. For alumina powder we have obtained an activation energy of 12.9 kcal/mol, which well agrees with the data reported in literature. The membrane reactor, instead, exhibited an activation energy ca. 60% lower. The preliminary porometry results have shown a slight effect of the platinum deposition process on membrane permeability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769301
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pt/γ-Al2O3 catalytic membranes vs. Pt on γ-Al2O3 powders in the selective hydrogenation of p-chloronitrobenzene (1997)
    Springer
    Catalysis letters 44 (1997), S. 205-210 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic activity of Pt/γ-Al2O3 membrane reactors, prepared using mesitylene solvated platinum atoms as source of active Pt particles, has been compared with that of analogously obtained Pt/γ-Al2O3 powders in the liquid phase hydrogenation of p-chloronitrobenzene. A largely different behaviour has been observed, the membrane reactor acting as a H2 richer system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018989428197
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and electron emission properties of films prepared from single-wall and multi-wall nanotubes containing powders (2000)
    Springer
    Applied physics 71 (2000), S. 121-124 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.48.+c; 79.70.+9; 85.45.Db
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The microstructure and field emission properties of films prepared from commercial powders of single-wall and multi-wall carbon nanotube films were investigated. In addition to nanotubes, these materials contained amorphous and crystalline carbon phases, and the single-wall powder also contained nano-particles of the Fe-Co catalysts. The turn-on fields were measured to be 2.3 V μm-1 for films prepared with the material containing single-wall nanotubes and 2.6 V μm-1 for those with multi-wall nanotubes. Long-term stability of emission current for these films was also investigated and correlated to their microstructure. Single-wall material showed a decrease in emission current that extended over several days and that was related to permanent degradation of emission sites. Emission current from the multi-wall material stabilized after an initial increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050039
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Existence theorems concerning simple integrals of the calculus of variations for discontinuous solutions (1987)
    Springer
    Archive for rational mechanics and analysis 98 (1987), S. 307-328 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    On the stability of equilibrium in critical cases (1967)
    Springer
    Meccanica 2 (1967), S. 82-94 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary A study of the stability of the equilibrium of a holonomic system in critical cases by means of the search for Lyapunov functions. A method of searching for such functions, which have the form of polynomials or power series, is discussed in general terms and is illustrated in a concrete application to the case of a system with two degrees of freedom. In the second part a different method is used to search for Lyapunov functions for dissipative systems. The discussion on stability leads to conclusions that generalize classical results.
    Notes: Sommario Viene compiuto uno studio della stabilità dell'equilibrio di un sistema olonomo, nei casi critici, attraverso la ricerca di funzioni di Lyapunov. Un metodo di ricerca di funzioni siffatte, aventi forma di polinomi o di serie di potenze, viene appunto discusso in generale ed, inoltre, illustrato attraverso la sua concreta applicazione al caso di un sistema con due gradi di libertà. Con un diverso metodo, in una seconda parte, si esegue una ricerca di funzioni di Lyapunov per i sistemi dissipativi, pervenendo, nella discussione della stabilità, a conclusioni che generalizzano alcuni classici risultati.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02128160
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The stability of continuous systems (1975)
    Springer
    Meccanica 10 (1975), S. 312-319 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02133223
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Solutions to linear equations depending on a parameter (1996)
    Springer
    Decisions in economics and finance 19 (1996), S. 103-112 
    Details
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Si fornisce un'analisi delle relazioni fra le soluzioni di un sistema di equazioni lineari che dipendono da un parametro. I risultati ottenuti sono poi applicati a un problema economico riguardante i prezzi: In base alla formalizzazione classica, i prezzi di produzione dipendono dalla tecnica e da un parametro, il tasso di profitto, che rappresenta la distribuzione.
    Notes: Abstract An analysis of the relationships between the solutions of a system of linear equations depending on a parameter is provided. The results are applied to an economic problem concerning prices: According to the classical formalisation, the prices of production depend on the technique and a parameter, the rate of profit, representing distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441264
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Measurement of ultraweak chemiluminescence emitted from isolated and perfused rat hearts (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 936-944 
    Details
    ISSN: 0392-6737
    Keywords: Biophysical instrumentation and techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stato usato un apparato di misurazione a un fotone per misurare la chemiluminescenza emessa durante la perossidazione dei fosfolipidi della membrana cellulare di un cuore di ratto isolato e perfuso sottoposto ad uno stress perossidativo. Lo stress perossidativo è stato ottenuto aggiungendo idroperossidi al liquido di perfusione. I differenti idroperossidi usati hanno prodotto tipiche evoluzioni temporali di chemi-luminescenza altamente riproducibili. La disponibilità di ossigeno influenza fortemente l'intensità e la cinetica di emissione della chemiluminescenza. Nell'àmbito di uno studio sull'effetto di differenti idroperossidi sul cuore di ratto isolato e perfuso, la misura della chemiluminescenza si è dimostrata un interessante e promettente strumento per il monitoraggio in continuo dei danni perossidativi nelle membrane biologiche. La sensibilità di questo metodo per la valutazione della perossidazione dei fosfolipidi delle biomembrane è circa dieci volte maggiore rispetto agli ordinari metodi di chimica analitica.
    Abstract: Резюме В этой статъе описывается аппаратура для ретистрации отделъных фотонов для непрерывного мониторнта улътраслабой хемилюминесценции, испус-каемой во время пероксидации фосфолипидов клеточной мембраны изолированного и перфузированного сердца крысы. В частности, аппаратура для ретистрации отделъ-ных фотонов исполъзуется для оценки напряжениь, индуцированных в сердце при добавлении тидроперекиси в пербузирующую жидкостъ. для этого исполъзуутся различные тидропероксиды, которые дают типичные временные эволюции улътса-слабой хемиюминесценции. Также получается, что наличие кислорода силъно влияет на интенсивиостъ и кинетику улътраслабои хемилюминесценции. Показывается, что улътраслабая хемилюминесценция представляет оченъ интересный и перспективный инструмент для мониторинга пероксидативных повреждений биологических мембран. Чувствителъностъ этого метода для пценки пероксидации босболинидов биомембран почти в десятъ раз выше, чем обычнын методов аналитической химии.
    Notes: Summary This paper describes the use of a single-photon counting apparatus (SPCA) for the continuous monitoring of the ultraweak chemiluminescence (UWC) emitted by isolated and perfused rat hearts and deriving from phospholipid peroxydation. Specifically the SPCA was used to assess the peroxidative stress induced in the heart by the addition of an hydroperoxide to the perfusing medium. To this purpose, different hydroperoxides were used and each one produced a tipical and highly reliable temporal evolution of UWC. It was also found that the oxygen availability strongly influences the intensity and the kinetic of the UWC emission. UWC was proved to be a very interesting and promising tool for monitoring the peroxidative damage of biological membranes, both because it makes a continuous assessment possible and because the sensitivity of this method is approximately ten times greater than usual analytical chemistry methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457093
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A primary exposure standard for X-rays in the (30÷150) keV range (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 382-396 
    Details
    ISSN: 0392-6737
    Keywords: Measurement of basic quantities ; Medical and biomedical uses of fields ; radiations and radioactivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si descrive il campione primario dell'unità di esposizione per raggi X di media energia dell'Istituto Superiore di Sanità (ISS), con particolare attenzione ad alcuni dettagli innovativi. Si discutono le metodiche d'intercalibrazione tra campioni primari di esposizione di diversi laboratori metrologici primari. Sono infine presentati i risultati di un confronto effettuato nel 1983 tra il campione primario di esposizione dell'ISS e l'analogo campione del Bureau International des Poids et Mesures.
    Abstract: Резюме Описывается первичный эталон экспозиции для рентгеновских лучей промежуточных энергий, предложенный Высщим институтом здравоохраненуя Италии. Особое внимание уделяется некоторым новым техническим деталам. Обсуждаются методы взаимной калибровки эталонов экспозиции из различных националъных метрологических лабораторий. В заключение приводятся результаты сравнения первичного эталона экспозиции Высщего института здравоохранения и первичного эталона экспозиции Международного Ъюро Мер и Весов, которое было проведено в 1983 году.
    Notes: Summary The primary exposure standard for medium-energy X-rays of the Istituto Superiore di Sanità (ISS) is described with particular attention to some innovatory details. Methods for intercalibrating exposure standards from various national primary-standard laboratories are discussed. The results of a comparison between the ISS exposure standard and that of the Bureau International des Poids et Mesures performed in 1983 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451295
    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...