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  • 1
    Electronic Resource
    Electronic Resource
    Generation of random sequences with jointly specified probability density and autocorrelation functions (1983)
    Springer
    Biological cybernetics 47 (1983), S. 141-146 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A new method is presented for the generation of stochastic (random) sequences with an arbitrarily specified first-order probability distribution function (PDF) and an arbitrarily specified first-roder auto-correlation function (ACF). A set of numbers with the desired PDF are first generated. These are then given a white (independent) ACF by double stochastic interchange. The desired ACF is then obtained by stochastically shuffling the series to minimize a sum of squares criterion between desired and actual ACFs. The technique is particularily useful for generating experimental stimuli for system identification, sequences for numerical simulation, and test series for evaluating signal processing algorithms when colored (non-white) non-Gaussian data are required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337087
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  • 2
    Electronic Resource
    Electronic Resource
    A new algorithm for the identification of multiple input Wiener systems (1992)
    Springer
    Biological cybernetics 68 (1992), S. 75-85 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Multiple-input Wiener systems consist of two or more linear dynamic elements, whose outputs are transformed by a multiple-input static non-linearity. Korenberg (1985) demonstrated that the linear elements of these systems can be estimated using either a first order input-ouput cross-covariance or a slice of the second, or higher, order input-output cross-covariance function. Korenberg's work used a multiple input LNL structure, in which the output of the static nonlinearity was then filtered by a linear dynamic system. In this paper we show that by restricting our study to the slightly simpler Wiener structure, it is possible to improve the linear subsystem estimates obtained from the measured cross-covariance functions. Three algorithms, which taken together can identify any multiple-input Wiener system, have been developed. We present the theory underlying these algorithms and detail their implementation. Simulation results are then presented which demonstrate that the algorithms are robust in the presence of output noise, and provide good estimates of the system dynamics under a wide set of conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203139
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  • 3
    Electronic Resource
    Electronic Resource
    Amorphous calcium phosphate in casein micelles of bovine milk (1983)
    Springer
    Calcified tissue international 35 (1983), S. 821-823 
    Details
    ISSN: 1432-0827
    Keywords: Milk-ACP-Citrate-Mg-Zn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The calcium phosphate remaining after hydrazine deproteination of casein micelles isolated from bulk skim milk exhibits under the electron microscope a very fine and uniform granularity being formed by small subunits with a true diameter of approximately 2.5 nm. This material, which is about 10 percent by weight citrate, termed calcium phosphate citrate (CPC) complex, also contains Mg and Zn at molar ratios of 0.03 and 0.003 respectively. Radial distribution function (RDF) and infrared analyses show that CPC is a Mg-containing amorphous calcium phosphate (ACP) similar to synthetic and cytoplasmic ACP. Presence of CPC in casein micelles as an amorphous colloid bonded with phosphoproteins provides the means for storing in milk large amounts of Ca (16 mM) and Pi (10 mM) in a readily utilizable form but at a higher ion concentration than found in biological solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405131
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  • 4
    Electronic Resource
    Electronic Resource
    Titanium production in a plasma reactor: A feasibility investigation (1995)
    Springer
    Plasma chemistry and plasma processing 15 (1995), S. 353-367 
    Details
    ISSN: 1572-8986
    Keywords: Titanium ; thermodynamic analysis ; thermal plasma ; expansion nozzle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The feasibility of producing titanium metal from titanium tetrachloride in a thermal plasma under equilibrium and adiabatic expansion conditions has been theoretically investigated. Free energy minimization and adiabatic expansion calculations to simulate a nozzle expansion were used to study the practicality of production. The crucial requirements for the production of titanium powder from TiCl4 and H2 appear to be rapid quenching of the plasma gas at high temperature (e.g., 3700 K) and appropriate reactant concentrations. Quenching of tire plasma gas and production of titanium powder can be achieved by adiabatic expansion through a nozzle. Preliminary experimental data indicate that titanium powder of approximately 5 nm in size can be produced in an argon plasma rising a nozzle expansion approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459703
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of a substrate on the temperature distribution in an argon-hydrogen thermal plasma jet (1994)
    Springer
    Plasma chemistry and plasma processing 14 (1994), S. 407-423 
    Details
    ISSN: 1572-8986
    Keywords: Thermal plasma spraying ; Rayleigh scattering ; heat transfer coefficient ; experimental
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Gas temperature profiles in the plume of an argon-hydrogen thermal plasma jet were determined /torn Rayleigh scattered laser light. Measured profiles were found to be well fitted by a Gaussian curve. Temperature data were compared with values obtained from thermocouples and showed an increasing discrepancy for temperatures higher than 800 K. The presence Q1 a cooled substrate in the flow was observed to increase the center-line temperature by about 22 at the substrate. By, combining the temperature results with calorimetric measurements of heal fox, a heat transfer coefficient to a copper substrate held at 300 K Iras determined to be in the range 400–1000 W/m2. K under typical plasma spraying conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570204
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  • 6
    Electronic Resource
    Electronic Resource
    Reduction of physiological signal contamination using linear filter identification (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 521-524 
    Details
    ISSN: 1741-0444
    Keywords: Linear dynamic filter ; Signal contamination ; System identification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442645
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  • 7
    Electronic Resource
    Electronic Resource
    Estimation of the conduction velocity of muscle action potentials using phase and impulse response function techniques (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 121-126 
    Details
    ISSN: 1741-0444
    Keywords: Cross-correlation ; Electromyography ; Impulse response function ; Muscle action potential conduction velocity ; Velocity distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Two new techniques are described for calculating the conduction velocity of action potentials in muscle fibres from surface EMG recordings in human subjects. In the first method the conduction velocity is determined from the impulse response function calculated from the two EMG signals. The peak of this function onsists of a single peak located at the delay between the signals. The velocity probability density distribution is then estimated from this impulse response function. The mode of this distribution occurred at 5 m s−1. The second technique uses the phase part of the frequency response function relating the two EMG signals to determine the conduction velocity. These two new approaches overcome some of the limitations associated with estimating conduction velocity from the maximum absolute value of the cross-correlation function, and provide additional information about the conduction velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442838
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  • 8
    Electronic Resource
    Electronic Resource
    Method for EMG conduction velocity estimation which accounts for input and output noise (1989)
    Springer
    Medical & biological engineering & computing 27 (1989), S. 125-129 
    Details
    ISSN: 1741-0444
    Keywords: Electromyography ; Input noise ; Muscle action potential conduction velocity ; Output noise ; System identification ; Time delay estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A new technique is derived for estimating the conduction velocity of muscle fibre action potentials from surface EMG recordings in humans. The method is based on system identification and extends previous such methods by explicity accounting for additive noise at the output as well as at the input. Experimental and simulation results demonstrate that at moderate noise levels the new method yields estimates comparable to those obtained with previous methods. However, simulation studies show that the new method should be particularly valuable at high noise levels, where it should provide much better estimates than previous techniques provided that an adequate representation of the noise is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446220
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  • 9
    Electronic Resource
    Electronic Resource
    Low inertia, rigid limb fixation using glass fibre casting bandage (1990)
    Springer
    Medical & biological engineering & computing 28 (1990), S. 96-99 
    Details
    ISSN: 1741-0444
    Keywords: Fibreglass casts ; Joint assessment ; Limb fixation ; Low inertia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441686
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  • 10
    Electronic Resource
    Electronic Resource
    Nonparametric two-dimensional point spread function estimation for biomedical imaging (1993)
    Springer
    Medical & biological engineering & computing 31 (1993), S. 277-283 
    Details
    ISSN: 1741-0444
    Keywords: Linear system identification ; Multidimensional ; Nonparametric ; Point spread function estimation ; Toeplitz matrix equation ; Two-dimensional filter estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The problem of identifying optical system point spread functions (PSFs) arises frequently in the area of image processing and restoration. The paper presents a method for determining two-dimensional PSFs from input/output image signals. The PSF of the system is determined from a set of linear equations involving elements of the input autocorrelation function and the input/output cross-correlation function. The resulting PSF is the one that minimises the sum of squares difference between the actual output image and the predicted one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458047
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