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  • Springer  (27)
  • 1995-1999  (26)
  • 1970-1974  (1)
  • 1965-1969
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  • 1
    Electronic Resource
    Electronic Resource
    The effects of fluctuating body forces on annular liquid jets (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 548-563 
    Details
    ISSN: 1432-0681
    Keywords: Key words nonlinear dynamics ; annular jet ; gravitational fluctuations ; adaptive finite difference method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  The nonlinear dynamics of axisymmetric, inviscid, incompressible, thin, annular liquid jets subjected to fluctuating body forces is studied numerically by means of an adaptive finite difference method which maps the time-dependent, curvilinear geometry of the jet into a unit square. The fluctuating body forces may arise from fluctuations in the gravitational acceleration in inertial frames or from the acceleration of a non-inertial frame of reference which translates parallelly to an inertial one. It is shown that both the pressure coefficient and the axial location at which the annular jet becomes a solid one are periodic functions of time with a period equal to that of the imposed body force fluctuations, and that their magnitude increases as the amplitude of the body force fluctuations is increased. It has also been shown that, for both intermittent, sinusoidal or rectangular excitations, increases in the frequency of the excitation result in the creation of superharmonics, broad, albeit peaked, spectra, and closed phase planes with many loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789096
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  • 2
    Electronic Resource
    Electronic Resource
    Kneading Theory: A Functorial Approach (1999)
    Springer
    Communications in mathematical physics 204 (1999), S. 89-114 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: We study the homology theory of ? - modal maps of the interval. We give another proof of the Milnor and Thurston results about zeta-functions and we give a functorial approach to kneading theory. Our results give explicit methods for computing the sequences of lap numbers ? (f k ) and the sequences of numbers of periodic points in an arbitrary interval [x,y].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050639
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  • 3
    Electronic Resource
    Electronic Resource
    Self-Timed Boundary-Scan Cells for Multi-Chip Module Test (1999)
    Springer
    Journal of electronic testing 15 (1999), S. 115-127 
    Details
    ISSN: 1573-0727
    Keywords: MCM testing ; boundary-scan ; self-timed CMOS design ; testing interconnections
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents a self-timed scan-path architecture, to be used in a conventional synchronous environment, and with basic application in digital testing and interconnections checking in a Smart-Substrate MCM (T.A. García, A.J. Acosta, J.M. Mora, J. Ramos, and J.L. Huertas, “Self-Timed Boundary-Scan Cells for Multi-Chip Module Test,” Proceedings of IEEE VLSI Test Symposium, April 1998, pp. 92–97). With this approach, the potential advantages of self-timed asynchronous systems are explored for their practical use in a classical MCM testing application. Three different self-timed asynchronous boundary scan cells are proposed (Sense, Drive and Drive & Sense cells) that can be connected to form a self-timed scan-path. The main advantage is that no global test clock is needed, avoiding clock skew and synchronization faults in test mode, and hence, a more reliable test process is achieved. These cells have been designed and integrated in active substrates, building several boundary-scan configurations and being fully compatible with the ANSI/IEEE 1149.1 Standard. The experimental results, as well as their comparison with their synchronous counterparts, show the feasibility of the proposed self-timed approach for testing interconnections in a MCM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008388318835
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  • 4
    Electronic Resource
    Electronic Resource
    Comet cross-section tokamaks (1995)
    Springer
    Journal of fusion energy 14 (1995), S. 361-371 
    Details
    ISSN: 1572-9591
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We explore the stability and confinement properties of tokamaks with comet-shaped plasmas which feature oblate cross-sections and negative triangularity. Such cross-section shaping is expected to reduce the trapping of particles in regions of bad curvature and lead to improved confinement. Additionally, it can improve stability to Mercier modes. This approach can therefore lead to reactors with improved confinement and lower plasma current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214514
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  • 5
    Electronic Resource
    Electronic Resource
    Accurate Effective Potentials of Real Substances from Acoustic Virial Coefficients (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 631-641 
    Details
    ISSN: 1572-9567
    Keywords: acoustic virial coefficients ; intermolecular potentials ; second virial coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Accurate second acoustic virial coefficients have been employed to determine parameters of an effective intermolecular potential for nine pure substances: argon, nitrogen, carbon dioxide, carbon tetrafluoride, and the first five alkanes (methane, ethane, propane, butane, and pentane). The values used for the second acoustic virial coefficients were taken from data reported in the literature. To obtain the form and parameters of the effective potential, we employed an inversion method recently introduced for volumetric second virial coefficients of nonconformal potentials. The potential parameters determined in this way are useful in predicting various gas properties. The model reproduces the experimental second virial data within their uncertainty, including volumetric second virial coefficients that were not used in the potential determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022617407216
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  • 6
    Electronic Resource
    Electronic Resource
    Designing bacteria for the degradation of nitro- and chloroaromatic pollutants (1996)
    Springer
    Naturwissenschaften 83 (1996), S. 201-213 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143325
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  • 7
    Electronic Resource
    Electronic Resource
    Designing Bacteria for the Degradation of Nitro- and Chloroaromatic Pollutants (1996)
    Springer
    Naturwissenschaften 83 (1996), S. 201-213 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143325
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray diffraction study of bulk poly N-substituted maleimides (1972)
    Springer
    Colloid & polymer science 250 (1972), S. 474-481 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Eine Serie von 7 aliphatischen und 6 aromatischen Poly-N-substituierten Maleimiden (PNMI) wurden mit radikalischer Polymerisation synthetisiert. Die Proben wurden mit Hilfe von Messungen der intrinsic-Viskosität, des Molekulargewichts-Zahlenmittels und der Glas-Temperatur charakterisiert. Röntgendiagramme der Proben zeigen zwei ziemlich breite Maxima, entsprechend der nichtkristallinen Struktur. Die Lage des inneren Piks hängt streng von der Länge der substituierten Gruppen ab und kann mit diesbezüglichen zwischenmolekularen Abständen verknüpft werden: Das beobachtete lineare Anwachsen des mit dem inneren Maximum verknüpften Abstandes entspricht nämlich der Anzahl der Methylengruppen in der substituierten aliphatischen Kette und weist darauf hin, daß sich die laterale Konformation vergrößert. Der äußere Pik entspricht mittleren intramolekularen Abständen längs der Kette und hängt nur wenig von den substituierten Gruppen ab. Die Distanz paßt zur Annahme einer 4/1-Helix-Konformation. In der Arylserie erscheint ein 3. Maximum, das auf das Auftreten von 3/1 Helices hinweist. Die berechneten Dimensionen von Kettenbündeln aus der Verbreiterung des inneren Maximums sind von der Größenordnung des doppelten inter-molekularen Abstands und zeigen somit an, daß keine wohldefinierte Nahordnung besteht. Ein Modell für die Packung der PNMI-Moleküle mit substituierten Seitengruppen wird vorgeschlagen.
    Notes: Summary A series of 7 aliphatic and 6 aromatic poly N-substituted maleimides (PNMI) was synthetized by free radical polymerization. The series was characterized by means of intrinsic viscosity, number average molecular weight and glass transition temperature measurements. The X-ray diffractograms of all samples show two rather broad maxima indicative of non-crystalline structures. The location of the innermost peak strongly depends on the length of the substituted groups and can be associated to intermolecular vectors. The observed linear increase of the spacing associated to the inner maximum with the number of methylene groups of the substituted aliphatic chain favours the idea of predominantly extended lateral conformations. The outer peak due is to intramolecular average distances along the backbone chain and slightly depends on the shape of the substituted groups. This repeat distance fits well with the assumption of a 4/1 helix for the chain conformation. In the aryl series a third maximum appearing as a shoulder on the outer peak suggests the presence of chain sequences coiled in 3/1 helices. The “chain bundle” dimensions calculated from the broadening of the innermost maximum are of the order of two intermolecular vectors suggesting, hence, the absence of a well defined short range order. A model for the packing of PNMI molecules with lengthy substituted groups is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01507515
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  • 9
    Electronic Resource
    Electronic Resource
    The effects of fluctuating body forces on annular liquid jets (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 548-563 
    Details
    ISSN: 1432-0681
    Keywords: nonlinear dynamics ; annular jet ; gravitational fluctuations ; adaptive finite difference method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The nonlinear dynamics of axisymmetric, inviscid, incompressible, thin, annular liquid jets subjected to fluctuating body forces is studied numerically by means of an adaptive finite difference method which maps the time-dependent, curvilinear geometry of the jet into a unit square. The fluctuating body forces may arise from fluctuations in the gravitational acceleration in inertial frames or from the acceleration of a non-inertial frame of reference which translates parallelly to an inertial one. It is shown that both the pressure coefficient and the axial location at which the annular jet becomes a solid one are periodic functions of time with a period equal to that of the imposed body force fluctuations, and that their magnitude increases as the amplitude of the body force fluctuations is increased. It has also been shown that, for both intermittent, sinusoidal or rectangular excitations, increases in the frequency of the excitation result in the creation of superharmonics, broad, albeit peaked, spectra, and closed phase planes with many loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789096
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  • 10
    Electronic Resource
    Electronic Resource
    Isothermal mass transfer in annular liquid jets with Sievert’ solubility law (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 260-269 
    Details
    ISSN: 1432-0681
    Keywords: Key words Liquid jet ; waste ; solubility ; interface ; fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A study of isothermal gas absorption by underpressurized, axisymmetric, thin, inviscid, incompressible, annular liquid jets which form enclosed volumes, where hazardous wastes may be burned, is presented. The study considers the nonlinear dynamical coupling between the fluid dynamics of, and the gases enclosed by, the annular liquid jet. It assumes equilibrium conditions at the interfaces, and employs Sievert’ solubility law to determine the gas concentration at the gas-liquid interfaces. Both steady-state and transient conditions are considered. Under steady-state conditions, the fluid dynamics and mass transfer phenomena are uncoupled, and the rate of generation of combustion gases is equal to the mass absorption rate by the liquid. The transient behaviour of the annular jet is determined from initial conditions corresponding to steady-state operation, once there is no gas generation by the combustion of hazardous wastes. It is shown that, for most of the conditions considered in this paper, there is no leakage of gaseous combustion products through the jet’ outer interface, and that the amount of gases dissolved in the liquid at the nozzle exit and the solubility ratio play a paramount role in determining the mass fluxes of hazardous combustion products at the annular jet’ interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805465
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