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  • Springer  (101)
  • Wiley-Blackwell  (10)
  • Cambridge University Press  (3)
  • BioMed Central
  • Nature Publishing Group
  • 1995-1999  (114)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Dual band multi-branch lasing from a hybrid CO2 laser (1997)
    Springer
    Optical and quantum electronics 29 (1997), S. 501-505 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract By judicious imposition of longitudinal mode control onto a resonator cavity, the Q-value of which increases with decreasing wavelength in the 11 to 9 μm region, simultaneous oscillation was obtained on all the four branches from a hybrid CO2 laser when its low pressure section operates in the sub-threshold condition. In the above threshold operation of this section, the hybrid laser lases simultaneously only on 9P, 9R, and 10P branch lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018507617606
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  • 2
    Electronic Resource
    Electronic Resource
    A signaling and control architecture for mobility support in wireless ATM networks (1996)
    Springer
    Mobile networks and applications 1 (1996), S. 287-298 
    Details
    ISSN: 1572-8153
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper presents a signaling and control architecture for mobility support in a “wireless ATM” network that provides integrated broadband services to mobile terminals. A system level protocol architecture for a wireless ATM network is outlined. The proposed protocol stack incorporates new wireless link MAC, DLC and wireless control sublayers, together with appropriate mobility extensions to the existing ATM network control layer. Wireless control and ATM signaling capabilities required for mobility support are discussed, and preliminary solutions are given for selected major functions. Potential extensions to standard Q.2931 ATM signaling are proposed to support handoff and service parameter/QoS renegotiation required for mobility. An associated wireless control protocol for supporting terminal migration, resource allocation, and handoff is discussed. Preliminary experimental results are given which validate the proposed handoff control protocol on an ATM network testbed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193262
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  • 3
    Electronic Resource
    Electronic Resource
    Throughput performance of distributed applications in switched networks in presence of end‐system bottlenecks (1999)
    Springer
    Telecommunication systems 12 (1999), S. 369-387 
    Details
    ISSN: 1572-9451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The steady state throughput performance of distributed applications deployed in switched networks in presence of end‐system bottlenecks is studied in this paper. The effect of various limitations at an end‐system is modelled as an equivalent transmission capacity limitation. A class of distributed applications is characterised by a static traffic distribution matrix that determines the communication between various components of the application. It is found that uniqueness of steady state throughputs depends only on the traffic distribution matrix and that some applications (e.g., broadcast applications) can yield non‐unique values for the steady state component throughputs. For a given switch capacity, with traffic distribution that yield fair unique throughputs, the trade‐off between the end‐system capacity and the number of application components is brought out. With a proposed distributed rate control, it has been illustrated that it is possible to have unique solution for certain traffic distributions which is otherwise impossible. Also, by proper selection of rate control parameters, various throughput performance objectives can be realised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019163216330
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  • 4
    Electronic Resource
    Electronic Resource
    Electrocatalytic activities of graphite-supported platinum electrodes for methanol electrooxidation (1996)
    Springer
    Journal of applied electrochemistry 26 (1996), S. 30-35 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrooxidation of methanol in 1 m NaOH at 30°C was studied on graphite-supported platinum electrodes prepared both in hydrogen and in air at various temperatures. Heating in hydrogen always produced higher surface area of Pt, and hence greater mass activity, than in air at a particular temperature. Nevertheless, both the graphite-supported platinum electrodes exhibited almost the same specific activity as a smooth Pt electrode for methanol electrooxidation irrespective of the preparation conditions. This indicates that the difference in mass activity is due to different surface areas produced by the different preparation methods. The Tafel slope of 110 mV decade−1 on all the electrodes studied indicated that the first charge transfer process was the rate-determining step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248185
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  • 5
    Electronic Resource
    Electronic Resource
    Variation of γ-Ray and Particle Fluxes At the Sea Level During the Total Solar Eclipse of 24 October, 1995 (1997)
    Springer
    Astrophysics and space science 250 (1997), S. 313-326 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Total Solar Eclipse (TSE) was observed from Diamond Harbour (lat. 22.2°N, long 88.2°E) on 24 October 1995. The variation of γ-ray intensity was measured in the energy range of 0.3–3.0 MeV for different time spans throughout the period of the eclipse. A CR-39 detector was used to look at the change in the fluxes of neutral and charged particles. The maximum drop (∼ 25%) in the intensity of γ-ray was observed in the range 2.5–3 MeV during TSE. The CR-39 results showed the appearance of a good number of tracks and a small variation of proton and neutron flux of ≤ 10% which was not significant statistically. Low energy γ-ray fluxes at sea level originate from the secondary electron-photon components of cosmic rays in the atmosphere; its modulation by TSE is interpreted as follows. The cooling of the atmosphere in the path of the umbra induces a reduction of the height of the main production layer of the nuclear component, as a result of which, fewer µ± mesons (from the decay of theπ± mesons) decay to e±. This leads to a small reduction in the flux of electron-photon component at sea level which originates from this branch; the main branch of e - γ component from π0 decay remains nearly unaffected. As the total mass of air remains the same, little or no change in the slow proton or the neutron flux at sea level is expected. These are consistent with the present observations. For a better understanding, further studies of this new phenomenon during future TSE are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000408422978
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  • 6
    Electronic Resource
    Electronic Resource
    Diborane as a reducing agent IX: Reduction of aTris(trifluoroacetyl)enaminospiroindoline (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 1283-1289 
    Details
    ISSN: 1434-4475
    Keywords: Tris(trifluoroacetyl)enaminospiroindoline ; Diborane ; 1-Trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindoline ; Hydroxyspiroindolenine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Reduktion der Titelverbindung (2) mit Diboran ergibt 1-Trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindolin (4), 1-Hydroxy-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)indol (5) und 1-Methyl-2-trifluoroethyl-1,2,3,4-tetrahydro-β-carbolin (6). Behandlung von2 mit Lithiumaluminiumhydrid, H2/Pd auf Aktivkohle und Natriumborhydrid führt jedoch zu Hydroxyspiroindolenin8, Hydroxy-bis(trifluoroacetyl)enaminospiroindolin9 und N-Ethyltryptamin (7). Die Ergebnisse werden diskutiert und die Mechanismen der zu den Produkten4–8 führenden Reaktionen werden vorgestellt.
    Notes: Summary Reduction of the title compound (2) with diborane furnishes 1-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindoline (4), 1-hydroxy-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)indole (5), and 1-methyl-2-trifluoroethyl-1,2,3,4-tetrahydro-β-carboline (6). However, treatment of2 with lithium aluminum hydride, H2/Pd on charcoal, and sodium borohydride affords hydroxyspiroindolenine8, hydroxy-bis(trifluoroacetyl)enaminospiroindoline9, andN-ethyltryptamine7, respectively. The results are discussed and the mechanisms of the reactions leading to4–8 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807261
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance VI. Some quantitative applications of carbon-13 NMR spectroscopy to phenylindoles (1996)
    Springer
    Monatshefte für Chemie 127 (1996), S. 111-116 
    Details
    ISSN: 1434-4475
    Keywords: Phenylindoles ; Quantitative13C NMR ; Chromium(III) acetylacetonate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Anzahl der durch jedes Signal der Phenylindole1,4 und5 repräsentierten Kohlenstoffatome wird durch Integration der nach Zusatz von Chrom(III)acetonylacetat als Relaxationsreagens aufgenommenen13C-NMR-Spektren bestimmt. Ihre chemischen Verschiebungen werden eindeutig zugeordnet; die Literaturwerte für4 werden bestätigt. Durch eine vergleichende Untersuchung der13C-chemischen Verschiebungen von1,4 und5 können jene von2 und3 ebenfalls zugeordnet werden. Dieortho-Kohlenstoffe der Phenylgruppe von4 sind gegenüber denpara-Kohlenstoffatomen zu höherem Feld verschoben. Für die 2- und 3-Phenyl-Substituenten von1–3 und5 kehren sich die Verhältnisse um, wahrscheinlich wegen sterischer und/oder elektronischer Effekte der benachbarten Phenylgruppe.
    Notes: Summary The number of carbons represented by each signal of the phenylindoles1,4, and5 is measured quantitatively by integration of their13C NMR spectra, recorded after adding chromium(III) acetylacetonate to the sample solutions as a paramagnetic relaxation agent. Their carbon chemical shifts are assigned unambiguously; the literature assignments of4 are confirmed. By a comparative study of the carbon chemical shifts of1,4, and5, those of2 and3 are also assigned. Theortho carbons of the phenyl group of4 resonate upfield with respect to thepara carbon. Theortho carbons of the 2- and 3-phenyl moieties of1–3 and5, however, are found to absorb downfield from the correspondingpara carbons, probably because of steric and/or electronic effects exerted by their neighbouring phenyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807416
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of a Trifluoromethylindolocarbazole, Novel Cyclic 27- and 36-Membered N-Benzyltri- and -tetraindoles, and an N-Benzyltetraindolyltrimethane (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 1227-1239 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Trifluoromethylindolocarbazole; Cyclic N-benzylindole tetramer; N-Benzyltetraindolyltrimethane; X-Ray crystallographic analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  5,11-Dihydro-5,11-dibenzyl-6-trifluormethylindolo[3,2-b]carbazol (6) und das cyclische N-Benzylindoltrimer 4 wurden aus N-Benzylindol-3-methanol (1) und N,N′-Dibenzyl-3,3′-diindolylmethan (2) durch Behandeln mit Trifluoracetanhydrid synthetisiert. Ersteres ergab auch das36-gliedrige cyclische N-Benzylindoltetramer 7, letzteres N-Benzyl-3-trifluoracetylindol (8). Erhitzen von 1 in wässrigem Methanol führte zum Trimer 4– zusammen mit 2, dem N-Benzyltriindolylmethan 3 und dem N-Benzyl-tetraindolyltrimethan 5, für welches Struktur und Konformation imfesten Zustand durch Röntgenstrukturanalyse abgeleitet wurden. Die Resultate werden diskutiert, und plausible Mechanismen für die Reaktionen, die zu den Verbindungen 3–8 führen, werden vorgestellt.
    Notes: Summary.  5,11-Dihydro-5,11-dibenzyl-6-trifluoromethylindolo[3,2-b]carbazole (6) and the cyclic N-benzylindole trimer 4 were synthesized from both N-benzylindole-3-methanol (1) and N,N′-dibenzyl-3,3′-diindolylmethane (2) by treatment with trifluoroacetic anhydride. The former also gave the 36-membered cyclic N-benzylindole tetramer 7, and the latter furnished N-benzyl-3-trifluoroacetylindole (8). Heating 1 in aqueous methanol also yielded the trimer 4 along with 2, the N-benzylitriindolyldimethane 3, and the N-benzyltetraindolyltrimethane 5 whose structure and solid-state conformation were determined by X-ray crystallographic analysis. The results are discussed and plausible mechanisms of the reactions leading to 3–8 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010184
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  • 9
    Electronic Resource
    Electronic Resource
    Determinant Bundle, Quillen Metric, and Petersson-Weil Form on Moduli Spaces (1999)
    Springer
    Geometric and functional analysis 9 (1999), S. 226-255 
    Details
    ISSN: 1420-8970
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. ((Without Abstract)).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000390050086
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  • 10
    Electronic Resource
    Electronic Resource
    A harmonic-type maximal principle in commutant lifting (1997)
    Springer
    Integral equations and operator theory 28 (1997), S. 373-381 
    Details
    ISSN: 1420-8989
    Keywords: 47A20 ; 47A57
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this note, we prove a harmonic-type maximal principle for the Schur parametrization of all intertwining liftings of an intertwining contraction in the commutant lifting theorem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309154
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