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  • Springer  (192)
  • Wiley  (58)
  • PANGAEA
  • 1995-1999  (250)
  • 1
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    Serological response to HPV16 in CIN-III and cervical-cancer patients. Case-control studies in Spain and Colombia (1996)
    Wiley
    Details
    Publication Date: 1996-03-28
    Print ISSN: 0020-7136
    Electronic ISSN: 1097-0215
    Topics: Biology , Medicine
    Published by Wiley
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    PAPER CURRENT
  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Electrodeposition of indium and zinc on aluminium (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 245-251 
    Details
    ISSN: 1572-8838
    Keywords: aluminium ; electrodeposition ; indium ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Zinc and indium were deposited from sulphate and chloride electrolytes onto aluminium electrodes under potentiostatic conditions. The role of the anion, pH, cation concentration, cathodic potential and agitation were investigated. The deposit morphology and composition were studied by SEM and EDX. Potentiodynamic and galvanostatic techniques were also applied for product characterization. Once a critical amount of Zn was deposited preferred In deposition began without agitation. But under rotation or at low cathodic potentials Zn2+ discharge became the prevalent reaction. The results support the earlier hypothesis of the preferential adsorption of Zn ions [1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003487808354
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure and vibrational spectra of polyamine-copper(II) complexes (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 15-22 
    Details
    ISSN: 1572-8854
    Keywords: X-ray diffraction ; infrared spectrometry ; polyamine-copper(II) complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures of [Cu(en)(H2O)2]SO4 (I), [Cu(en)2](NO3)2 (II) and [Cu(trien)I]I (III) have been determined by single crystal X-ray diffraction. ComplexI is monoclinic, space group C2/c, with unit cell parametera=7.232(1),b=11.725(2),c=9.768(1), β=105.50(1)°, andZ=4. ComplexII is also monoclinic, space group P21/a, witha=7.978(2),b=9.982(4),c=8.218(3), β=111.11(2)°, andZ=2. ComplexIII is orthorhombic, space group P212121, witha=8.098(1),b=11.902(1),c=13.682(2), andZ=4. The structures were solved by direct methods and refined by full-matrix least-squares to finalR values of 0.031, 0.043 and 0.036 for complexesI, II, andIII, respectively. ComplexesI andII show an octahedral coordination geometry. ComplexIII shows a square pyramidal coordination geometry. ComplexI forms infinite monodimensional chains where the SO 4 2− ions acts as a bridge between two neighboringen molecules. The vibrational spectra of these complexes agree well with their crystal structures. Structure and stability of seven other related Cu(II) complexes of (trien), (dien)2, (en)2 and (en) are inferred in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02018691
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  • 8
    Electronic Resource
    Electronic Resource
    Models for residual time to AIDS (1996)
    Springer
    Lifetime data analysis 2 (1996), S. 31-49 
    Details
    ISSN: 1572-9249
    Keywords: Marker-dependent hazard ; Survival analysis ; Brownian motion ; Ornstein-Uhlenbeck process ; Disease markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The distributions of the time from Human Immunodeficiency Virus (HIV) infection to the onset of Acquired Immune Deficiency Syndrome (AIDS) and of the residual time to AIDS diagnosis are important for modeling the growth of the AIDS epidemic and for predicting onset of the disease in an individual. Markers such as CD4 counts carry valuable information about disease progression and therefore about the two survival distributions. Building on the framework set out by Jewell and Kalbfleisch (1992), we study these two survival distributions based on stochastic models for the marker process (X(t)) and a marker-dependent hazard (h(⋅)). We examine various plausible CD4 marker processes and marker-dependent hazard functions for AIDS proposed in recent literature. For a random effects plus Brownian motion marker process X(t)=(a+bt+BM(t))4, where a has a normal distribution, b〈0 is an unknown parameter and BM(t) is Brownian motion, and marker-dependent hazard h(X(t)), we prove that, given CD4 cell count X(t), the residual time to AIDS distribution does not depend on the time since infection t. Using simulation and numerical integration, we find the marginal incubation period distribution, the marginal hazard and the residual time distribution for several combinations of marker processes and marker-dependent hazards. An example using data from the Multicenter AIDS Cohort Study is given. A simple regression model relating the cube root of residual time to AIDS to CD4 count is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128469
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  • 9
    Electronic Resource
    Electronic Resource
    Electrodeposition of Zn and In onto vitreous carbon (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 1297-1304 
    Details
    ISSN: 1572-8838
    Keywords: electrodeposition ; indium ; vitreous carbon ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The deposition of indium and zinc on vitreous carbon was studied by voltammetric, galvanostatic and single potentiostatic pulse techniques. The morphology and composition of deposits were analysed by SEM/EDX. The codeposition process occurs without the formation of alloys or intermetallic compounds. On the one hand under stagnant conditions or at low electrode rotation speeds, localized alkalization produced by the hydrogen evolution reaction (HER) favours deposition through an indium hydroxide layer, and deposits with the same atomic percentage of In and Zn are attained. On the other hand, under electrode rotation, preferred deposition of Zn takes place. In this case, the reduction of H+ by the In+ species, intermediate in the In3+ reduction process, diminishes the electrochemical HER on the substrate thus favouring Zn deposition. The higher nucleation rate on metallic deposits previously formed on the vitreous carbon surface is also likely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003777023798
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  • 10
    Electronic Resource
    Electronic Resource
    Uniform Rates of Decay in Anisotropic Thermo-Viscoelasticity (1998)
    Springer
    Acta applicandae mathematicae 50 (1998), S. 207-224 
    Details
    ISSN: 1572-9036
    Keywords: viscoelasticity ; exponential decay ; initial boundary-value problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider the anisotropic and inhomogeneous thermo-viscoelastic equation. We prove that the first and second-order energy decay exponentially as time goes to infinity provided the relaxation function also decays exponentially to zero. While if the relaxation functions decay polynomially to zero, then the energy decays also polynomially. That is, the kernel of the convolution defines the rate of decay of the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005830811242
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