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  • Springer  (421)
  • National Academy of Sciences  (26)
  • Springer Nature  (25)
  • 2000-2004  (132)
  • 1995-1999  (208)
  • 1990-1994  (132)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Polymerization of anilines by the use of copper(II) perchlorate as an oxidative coupling agent (1991)
    Springer
    Polymer bulletin 26 (1991), S. 403-408 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyaniline and polyalkylaniline perchlorates were prepared by oxidative coupling polymerization of anilines by the use of copper(II) perchlorate in acetonitrile as an oxidant. The corresponding polymer bases obtained by treating the perchlorates with alkaline solution were soluble in dimethylsulfoxide and partly soluble in tetrahydrofuran. The molecular weights of the THF-soluble components were 2000–6000. The charge transport of the perchlorates is influenced by the chain length and the steric effect of alkyl substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302607
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  • 2
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    Selective induction of apoptosis by capsaicin in transformed cells: the role of reactive oxygen species and calcium (1999)
    Springer Nature
    Details
    Publication Date: 1999-01-28
    Print ISSN: 1350-9047
    Electronic ISSN: 1476-5403
    Topics: Biology , Medicine
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Morphological and structural analysis in the Anaga offshore massif, Canary Islands: fractures and debris avalanches relationships (2003)
    Springer
    Details
    Publication Date: 2003-03-01
    Print ISSN: 0025-3235
    Electronic ISSN: 1573-0581
    Topics: Geosciences , Physics
    Published by Springer
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Book review (2000)
    Springer
    Bulletin of mathematical biology 62 (2000), S. 795-797 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/bulm.1999.0175
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  • 5
    Electronic Resource
    Electronic Resource
    Study on the interaction of diarylbutadiynes with free radicals: Interaction with propagating radicals of some vinyl monomers (1999)
    Springer
    Polymer bulletin 43 (1999), S. 357-364 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In order to study the nature of interaction of arylbutadiynes with transient free radicals, polymerization and copolymerization of some vinyl monomers such as methyl methacrylate (MMA), styrene (ST), methacrylonitrile (MAN), vinylidene chloride (VCl2), ethyl acrylate (EA) and acrylonitrile (AN), were carried out in the presence of diphenylbutadiyne (DPB), 4,4'-butadiynylene-N,N,N',N'-tetra-n-butyl-dibenzamide (BBA), and 4,4'-dibromodiphenylbutadiyne (BPB). MMA gave an intense ESR signal at the polymerization temperature when the polymerization system became viscous, and the number of radicals increased with polymerization time. Strong signals of polyEA and polyMAN radicals were also observed in the presence of DPB when the polymerization system became almost solid. This is a unique case where active transient propagating radicals such as that of polyEA can be detected at polymerization temperature. The rates of polymerization decreased by the presence of the diacetylenes, but the molecular weights did not change with the diacetylene concentrations. UV spectroscopy revealed that there was no diacetylene unit bonded to the obtained polymers, indicating that degradative chain transfer is not the case. The monomer reactivity ratios for MMA-ST and MMA-AN systems did not vary significantly in the presence of the diacetylenes, although some difference was observed. It seems that some arylbutadiynes interact with free radicals but do not form bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050622
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  • 6
    Electronic Resource
    Electronic Resource
    Mean-field solution of the parity-conserving kinetic phase transition in one dimension (2003)
    Springer
    The European physical journal 35 (2003), S. 505-511 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A two-offspring branching annihilating random walk model, with finite reaction rates, is studied in one-dimension. The model exhibits a transition from an active to an absorbing phase, expected to belong to the DP2 universality class embracing systems that possess two symmetric absorbing states, which in one-dimensional systems, is in many cases equivalent to parity conservation. The phase transition is studied analytically through a mean-field like modification of the so-called parity interval method. The original method of parity intervals allows for an exact analysis of the diffusion-controlled limit of infinite reaction rate, where there is no active phase and hence no phase transition. For finite rates, we obtain a surprisingly good description of the transition which compares favorably with the outcome of Monte Carlo simulations. This provides one of the first analytical attempts to deal with the broadly studied DP2 universality class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00303-4
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  • 7
    Electronic Resource
    Electronic Resource
    Applications of maximum entropy method in capillary viscometry (1996)
    Springer
    Rheologica acta 35 (1996), S. 76-82 
    Details
    ISSN: 1435-1528
    Keywords: Viscosity measurement ; capillary viscometer ; maximum entropy method ; Weissenberg-Rabinowitsch-Mooney equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Maximum entropy method (MEM) is presented as a technique for processing data obtained from capillary viscometers. The performance of MEM is assessed by comparing the viscosity versus shear rate curves generated by MEM against that obtained by the standard method based on the “Weissenberg-Rabinowitsch-Mooney equation”. In all the cases in vestigated, MEM proved to be a reliable technique in coping with the experimental noise in the capillary data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366555
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  • 8
    Electronic Resource
    Electronic Resource
    Generalized Cochannel Outage Analysis with DTX in PCS Channels (1998)
    Springer
    Wireless personal communications 8 (1998), S. 1-13 
    Details
    ISSN: 1572-834X
    Keywords: outage probability ; Ricean channels ; Nakagami channels ; DTX ; cochannel interference.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Spectrum limitations are often a deterrent for swift growth of cellular radio systems. Therefore, different technologies have been explored to enhance the Radio Frequency (RF) capacity as well as to improve the communication quality. Recent technologies suggest the use of Discontinuous Transmission (DTX) as a mean to achieve these goals. In this paper, we analyze and quantify the performance improvement which result from implementing DTX in microcellular systems. The performance criteria is chosen to be the outage probability of de signal to interference ratio. Closed form expressions are derived for outage probabilities for systems using discontinuous transmission. Results are obtained for generalized Nakagami(n)/Nakagami(m) channels as well as for Ricean/Nakagami(m) environments. Moreover, since DTX effectiveness depend on voice patterns, modified expressions are developed for average outage probabilities which take into consideration different voice activity factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008893900288
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  • 9
    Electronic Resource
    Electronic Resource
    Phenotypic characteristics and relative proportions of three genotypic variants isolated from a nucleopolyhedrovirus of Spodoptera exigua (2000)
    Springer
    Entomologia experimentalis et applicata 97 (2000), S. 275-282 
    Details
    ISSN: 1570-7458
    Keywords: Spodoptera exigua ; nucleopolyhedrovirus ; genotypic variants ; relative proportion ; phenotypic characteristic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract US2A, US2D, and US2F are three in vivocloned genotypic variants from the wild-type strain of a Spodoptera exiguanucleopolyhedrovirus (SeMNPV) isolated in Florida (USA) and is the active component of the commercial bioinsecticide Spod-X®. These variants were compared in terms of pathogenicity (LD50), speed of kill (expressed as mean time to death) and viral progeny productivity (OBs/larva). LD50values were similar for the three cloned genotypes. The mean time to death value for US2D (113.7 h) was significantly higher than those of US2A (31.7 h) and US2F (27.8 h). Virus yield was determined for L4larvae infected with the estimated LD99. US2D infected larvae attained higher weight than those infected with US2A and US2F, and produced a higher OB yield than larvae infected with US2A or US2F. An outstanding feature of US2F, in contrast to US2A and US2D, was its inability to disrupt the teguments of NPV-killed larvae. To study the relative proportion of the three genotypic variants throughout successive passages, S. exigualarvae were originally infected with a viral inoculum containing a 1:1:1 mixture of the three genotypes. After three successive passages, US2D was no longer detected in either of the three replicate experiments performed, while US2A was the predominant genotype in all of them, and US2F remained at similar proportions throughout the three passages. The influence of the phenotypic characteristics of the three variants on their relative proportions in mixed infections is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004045526205
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  • 10
    Electronic Resource
    Electronic Resource
    Electrochemical behaviour of chalcopyrite in the presence of silver and Sulfolobus bacteria (1997)
    Springer
    Journal of applied electrochemistry 28 (1997), S. 49-56 
    Details
    ISSN: 1572-8838
    Keywords: Chalcopyrite ; Bioleaching ; Thermophilic bacteria ; Sulfolobus ; Silver catalysis ; Potentiodynamic polarization ; Cyclic voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrochemical behaviour of massive chalcopyrite electrodes has been studied in an acid medium (pH1.5) containing silver ions (0.02gdm−3Ag+) and thermophilic bacteria (68°C). Preliminary tests on particulate electrodes made from graphite, elemental sulfur and Ag2S were included to determine the electrochemical response of reactants (Ag+) and products (S° and Ag2S) associated with the dissolution of chalcopyrite in the presence of silver. Massive chalcopyrite electrodes under potential scan showed a dependence on the dissolution of the Ag2S film with both the time of contact with the silver solution and [Ag+]. As well as Ag2S, metallic silver was detected on the chalcopyrite surface. It has been demonstrated that Fe3+ and bacteria play an important role in the regeneration of the Ag2S film. The breakdown of this film is a requirement for the further dissolution of chalcopyrite. The bioleaching of chalcopyrite with thermophilic microorganisms in the presence of silver decreased the decomposition potential of the electrode and favoured its electrodissolution. Bioleaching treatment in the presence of silver ions for periods of time longer than two weeks did not improve the surface reactivity. However, in the initial stages of the process, the lower reactivity of the bioleached electrodes was probably related to a toxic effect of silver on the microorganisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003245701307
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