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  • 04.08. Volcanology  (7)
  • Chemistry  (7)
  • autonomous platform; DATE/TIME; EuroSea; Improving and Integrating European Ocean Observing and Forecasting Systems for Sustainable use of the Oceans; netCDF file; netCDF file (File Size); SAILDRONE; SAILDRONE Gen6 Explorer USV; SD_1079-track  (3)
  • elliptic functions  (3)
  • Molecular Sequence Data  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Viscosity and optical observation on poly(ethylene terephthalate) during annealing and thermal scanning (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 767-774 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über einige Ergebnisse berichtet, die bei der Beobachtung von Polyäthylenterephthalat [Poly(oxyäthylenoxyterephthaloyl)] mit dem optischen Mikroskop während des isothermen Temperns und Aufheizens zwischen Zimmer- bzw. Tempertemperatur und Schmelztemperatur erhalten wurden. Parallel dazu wurden Änderungen des Molekulargewichts viskosimetrisch kontrolliert. In allen Versuchen wurden Sphärolithe beobachtet, deren Größe sich nur während der Kristallisation und im Schmelzbereich änderte. Aus den Ergebnissen wird geschlossen, daß die großen Änderungen, die das endotherme, Maximum der DSC-Kurve bei Temperaturen unterhalb der Schmelztemperatur zeigt (peak II), nur durch Änderungen der Ordnung im Innern der Sphärolithe verursacht sein können. Damit wird das von Roberts und Holdsworth vorgeschlagene Modell bestäigt.
    Notes: Some results obtained with poly(ethylene terephthalate) [poly(oxyethyleneoxyterephthaloyl)] following by optical microscopy the isothermal annealing and the thermal scanning from room temperature or annealing temperature up to the melting point are reported. Besides, the variation of the molecular weight is controlled by viscometry. It is observed that the structure is always characterized by spherulites, whose sizes change only during the crystallization and in the melting range. The conclusion is reached that the structural modifications on which the large variations of the endothermal maximum of the DSC curve below the melting temperature (peak II) depend, occur inside the spherulites. The model suggested by Roberts and Holdsworth seems to be supported by our data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760318
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  • 2
    Electronic Resource
    Electronic Resource
    Stochastic averaging using elliptic functions to study nonlinear stochastic systems (1993)
    Springer
    Nonlinear dynamics 4 (1993), S. 373-387 
    Details
    ISSN: 1573-269X
    Keywords: Stochastic averaging ; nonlinear systems ; elliptic functions ; probability density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, a new scheme of stochastic averaging using elliptic functions is presented that approximates nonlinear dynamical systems with strong cubic nonlinearities in the presence of noise by a set of Itô differential equations. This is an extension of some recent results presented in deterministic dynamical systems. The second order nonlinear differential equation that is examined in this work can be expressed as % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWexLMBb50ujb% qeguuDJXwAKbacfiGaf8hEaGNbamaacqGHRaWkcaWGJbadcaaIXaGc% cqWF4baEcqGHRaWkcaWGJbadcaaIZaGccqWF4baEdaahaaWcbeqaai% aaiodaaaGccqGHRaWkcqaH1oqzcaWGMbGaaiikaiab-Hha4jaacYca% cqWFGaaicuWF4baEgaGaaiaacMcacqGHRaWkcqaH1oqzdaahaaWcbe% qaaiaaigdacaGGVaGaaGOmaaaaruWrL9MCNLwyaGGbcOGaa43zaiaa% cIcacqWF4baEcaGGSaGae8hiaaIaf8hEaGNbaiaacaGGSaGae8hiaa% IaeqOVdGNaaeikaiaadshacaqGPaGaaiykaiabg2da9iaaicdaaaa!645D!\[\ddot x + c1x + c3x^3 + \varepsilon f(x, \dot x) + \varepsilon ^{1/2} g(x, \dot x, \xi {\text{(}}t{\text{)}}) = 0\] where c 1 and c 3 are given constants, ξ(t) is stationary stochastic process with zero mean and ε≪1 is a small parameter. This method involves the laborious manipulation of Jacobian elliptic functions such as cn, dn and sn rather than the usual trigonometric functions. The use of a symbolic language such as Mathematica reduces the computational effort and allows us to express the results in a convenient form. The resulting equations are Markov approximations of amplitude and phase involving integrals of elliptic functions. Finally, this method was applied to study some standard second order systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120672
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  • 3
    Electronic Resource
    Electronic Resource
    The Method of Averaging for Euler's Equations of Rigid Body Motion (1997)
    Springer
    Nonlinear dynamics 14 (1997), S. 295-308 
    Details
    ISSN: 1573-269X
    Keywords: Spacecraft attitude motion ; method of averaging ; elliptic functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We formulate the method of averaging for perturbations of Euler's equations of rotational motion. Euler's equations are three strongly nonlinear coupled differential equations that can be viewed as a three dimensional oscillator. The method of averaging is used to determine the long-term influence of perturbation terms on the motion by averaging about the nominal rigid body motion. The treatment is applicable to a large class of motions including precession with large nutation – it is not restricted to small motions about simple spins or nearly axi-symmetric bodies. Three examples are shown that demonstrate the accuracy of the method's predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008215327247
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  • 4
    Electronic Resource
    Electronic Resource
    Chaos in a system with a periodically disappearing separatrix (1990)
    Springer
    Nonlinear dynamics 1 (1990), S. 401-420 
    Details
    ISSN: 1573-269X
    Keywords: Chaos ; perturbation methods ; elliptic functions ; differential equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We investigate the system $$\ddot x - x\cos \varepsilon 1 + x^3 = 0$$ in which ε≪1 by using averaging and elliptie functions. It is shown that this system is applicable to the dynamics of the familiar rotating-plane pendulum. The slow foreing permits us to envision an ‘instantancous phase portrait’ in the $$x - \dot x$$ phase plane which exhibits a center at the origin when cos ε1≤0 and a saddle and associated double homoclinic loop separatrix when cos ɛ 1 〉 0. The chaos in this problem is related to the question of on which side (left (=L) or right (=R)) of the reappearing double homoclinic loop separatrix a motion finds itself. We show that the sequence of L's and R's exhibits sensitive dependence on initial conditions by using a simplified model which assumes that motions cross the instantancous separatrix instantancously. We also present an improved model which ‘patches’ a separatrix boundary layer onto the averaging model. The predictions of both models are compared with the results of numerical integration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01893171
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  • 5
    Electronic Resource
    Electronic Resource
    Gas holdup and mass transfer in solid suspended bubble columns in presence of structured packings (1997)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 20 (1997), S. 297-303 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Electrochemical gas absorption or biotechnical purification processes using structured packing as electrode or as biological support, respectively, may operate in bubble columns in presence of suspended solids. In both systems the knowledge of mass transfer rates from the liquid to the packing is important for the design of equipment. In the present investigation, the fluid dynamic behavior of a simple bubble column and a bubble column containing small size particles, both in presence of structured packing, was studied. Furthermore, mass transfer coefficients between the liquid and the structured packing were obtained by the electrochemical method. The influence of physical properties of the liquid phase, gas flow rate, kind and concentration of the suspended particles on both gas holdup and mass transfer was investigated. Correlations of the experimental data of mass transfer using dimensionless groups were derived and compared to previous correlations. Similarity with a heat transfer expression already used in two-phase systems was found.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270200503
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  • 6
    Electronic Resource
    Electronic Resource
    Negative-ion fast atom bombardment mass spectrometry in the characterization of deoxyfluorinated sugars (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 29 (1994), S. 553-555 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Negative-ion fast atom bombardment mass spectrometry and metastable ion studies were applied to the characterization of three isomeric fluorine-containing sugars. Peculiar fragmentation processes were evidenced for each isomer, enabling their differentiation. Comparison with the behaviour of a non-fluorinated analogue allowed investigation of the role of fluorine in the decomposition processes of these compounds.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210291007
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  • 7
    Electronic Resource
    Electronic Resource
    Salt effect on gel permeation chromatography of partially charged polymers (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 2829-2834 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of the addition of 0.1M LiBr to dimethylformamide (DMF) solutions of charged and uncharged polymers has been studied by GPC and [η] measurements. LiBr has a salting-out effect on polyacrylonitrile (with (PAN-S) and without (PAN) sulfonate sulfur), polystyrene (PS), and poly(vinyl acetate) (PVAc), which is seen by a decrease in [η] and an increase in the GPC retention time. The increase in retention time is, however, abnormally high for charged polymers. Association in PAN and PAN-S solutions in DMF can explain the experimental observations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070161109
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  • 8
    Electronic Resource
    Electronic Resource
    13C NMR investigation of some hetero-ring substituted 2- and 4-quinolone systems (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 17 (1981), S. 242-245 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of 2- and 4-quinolones substituted in the hetero-ring have been evaluated using 13C NMR techniques. Substituent effects are discussed as an aid to evaluation of potential tautomerization in the 2-quinolone systems. The observed substituent shifts for systems having a hydroxy function at the 4-position in the 2-quinolones can be explained without implementing the tautomerism to a 4-quinolone.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270170404
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  • 9
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectrometry of new polydentate schiff bases. 2. The case of mono- and bisaldimines containing pyridine groups (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 29 (1994), S. 566-570 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric behaviour of seven polydentate Schiff bases derived from the condensation of formyl or diformyl precursors (2,3-dihydroxy- or 2,5-dihydroxy-benzaldehyde, 3-metoxy- or 3-ethoxy-salicylaldehyde, 3-formyl-salicyclic acid, 4-methoxy- or 4-chloro-2,6-diformylphenol) with 2-aminomethylpyridine have been investigated by fast atom bombardment mass spectrometry and metastable ion studies.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210291010
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  • 10
    Electronic Resource
    Electronic Resource
    Particle size control and optical properties of laser-synthesized silicon nanopowders (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 12 (1998), S. 361-365 
    Details
    ISSN: 0268-2605
    Keywords: silicon nanoparticles ; optical properties ; CO2 laser ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Silicon nanoparticles have been synthesized by heating reactant gases with a 500 W CO2 laser. A technique based on scattering of He-Ne laser light by particulates in a reaction flame has been developed for probing the particle size evolution during the process, in order to scale down the particle diameter (under 10 nm). The optical and structural properties of laser-synthesized silicon nanopowders obtained in different runs are reported. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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