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  • 1
    Electronic Resource
    Electronic Resource
    A new family of biquads with applications to MOSFET-C filters (1993)
    Springer
    Circuits, systems and signal processing 12 (1993), S. 119-131 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A new family of RC-active biquadratic building blocks are proposed in this communication. These biquads are especially designed for MOSFET-C applications, since they achieve a complete MOS nonlinearity cancellation. The proposed circuits can realize all the generic transfer functions such as lowpass, highpass, bandpass, band-rejection, and allpass. They also enjoy low passband sensitivities with respect to passive elements. The gain-bandwidth product-sensitivity is investigated too. An example of a high Q-bandpass filter is given with its Monte-Carlo simulation to verify its sensitivity performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183151
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  • 2
    Electronic Resource
    Electronic Resource
    On cyclically symmetric presentations for SL3 andG 2 (1993)
    Springer
    Archiv der Mathematik 61 (1993), S. 409-420 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207540
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  • 3
    Electronic Resource
    Electronic Resource
    Hornblende barometry of the Galway batholith, Ireland: an empirical test (1994)
    Springer
    Mineralogy and petrology 51 (1994), S. 243-250 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Vier Hornblende-Geobarometer, zwei empirische and zwei experimentelle wurden auf den 400 m.y. alten Galway-Granit, Irland, angewendet and ergeben ähnliche Resultate. Der Durchschnitt der Berechnungen gibt einen Kristallisationsdruck der zonierten Hornblendekerne in den westlichen Teilen des Granits von 2.62 ± 1.2 kbar. Diese Werte fallen auf weniger als 〈 1.53 ± 1.02 kbar in den Hornblenderändern, während in den östlichen Teilen des Batholithen ein Wert von 4.30 ± 0.70 kbar von nicht zonierten Hornblenden erhalten wurde. Diese Ergebnisse stimmen gut mit Geländebeobachtungen und petrographischen Daten überein, die darauf hinweisen, daß der Granit im zentralen und östlichen Bereich in größerer Tiefe kristallisiert ist. Dabei erreichten K-Feldspat Kristalle Maximumlängen von 6 cm, verglichen mit nur 3 cm im Westen und am Rand. Obwohl ein Teil der Hebung auf späte Verwerfungen zurückgeht, war die Haupthebung zentraler Teile des Granites im Osten durch spätmagmatische, differentielle Gleitung gegenüber den randlichen Granitzonen bedingt, wobei letztere vertikal gefältelt wurden. Im Westen begann die Kristallisation der Hornblende bei niedrigeren Drucken als im Osten, wobei die späteste Hornblende-Kristallisation an der Grenze des Feldes magmatischer Hornblende und in Tiefe von 〈 als 5 km stattfand. Hornblende-Geobarometrie zeigt, daß 1. verschiedene Teile des gleichen Batholithen unter verschiedenen Drucken (und somit in verschiedenen Tiefen) kristallisierten und erst im gegenwärtigen Erosions-Niveau nebeneinander gestellt wurden; 2. daß wenigstens die Frühkristallisation einiger Granite in signifikant größeren Tiefen als die Endkristallisation, und die Position der Platznahme lagen; 3. in zonierten Hornblenden Kristallisation während magmatischer Bewegung stattfand.
    Notes: Summary The application of four hornblende geobarometers, two empirical and two experimental, to the 400 Ma Galway Granite, Ireland gives a pressure of crystallization of the zoned hornblende cores in the western parts of the granite of 2.62 ± 1.2 kb falling to 〈 1.53 ±1.02 kb at the hornblende rims whereas in the more eastern part of the batholith the value of 4.30 ± 0.70 kb is obtained from unzoned hornblendes. These results are consistent with field and petrographic evidence which indicates a much deeper level of early crystallization of the granite in the central and eastern area with larger K-feldspar phenocrysts (up to 6 cm). Although some of the uplift is related to late upward faulting, the main uplift of the centre of the granite in the east was due to late magmatic differential slip against the marginal granite which became vertically foliated. In the west the crystallization of hornblende started and completed at lower pressures than in the east with final hornblende crystallization at the limit of the field of igneous hornblende and at depth of 〈 5 km. Hornblende geobarometry reveals: (1) that different parts of some batholiths crystallized at very different pressures (and therefore depths) and have been juxtaposed at the present level of erosion (2) that at least the early part of the crystallization of some granites took place at significantly greater depths than the final crystallization and emplacement position; (3) in zoned hornblendes crystallization occurred during magma movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159731
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  • 4
    Electronic Resource
    Electronic Resource
    Wavelength-dependent anisotropy of surface second-harmonic generation from Si(111) in the vicinity of bulk absorption (1994)
    Springer
    Applied physics 58 (1994), S. 111-115 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A wavelength-dependence study of surface second-harmonic generation from Si(111) is presented. Femtosecond laser pulses tuned from 430 nm to 710 nm were used to probe the dispersion characteristics of the nonlinear response from the surface in the vicinity of bulk absorption. Changes in the rotational symmetry and in the phase of the generated second-harmonic signal were observed. An explanation of the observed changes is given based on a simple anharmonic oscillator model [1]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082344
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  • 5
    Electronic Resource
    Electronic Resource
    Efficient compression of femtosecond pulses by stimulated Raman scattering (1994)
    Springer
    Applied physics 59 (1994), S. 471-473 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Femtosecond pulses at 496 nm were Raman-shifted in methane with 20% efficiency. The pulse duration could be reduced up to 6.5 times from 560 fs at the fundamental to 85 fs at the Stokes frequency (580nm), which is the shortest pulse duration generated in this way. It was shown experimentally that chirped-pulse Raman scattering avoids the limitations arising from self-phase modulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081070
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  • 6
    Electronic Resource
    Electronic Resource
    Cadmium and membrane ion transport in a French urban male population (1991)
    Springer
    Bulletin of environmental contamination and toxicology 47 (1991), S. 850-857 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01689515
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  • 7
    Electronic Resource
    Electronic Resource
    Validity of hair cadmium in detecting chronic cadmium exposure in general populations (1993)
    Springer
    Bulletin of environmental contamination and toxicology 50 (1993), S. 736-743 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194670
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of certain pyrrolo[2,3-b]pyridine-5-carboxylic acid derivatives as potential antimicrobial agents (1991)
    Springer
    Monatshefte für Chemie 122 (1991), S. 725-730 
    Details
    ISSN: 1434-4475
    Keywords: Synthesis ; Pyrrolo[2,3-b]pyridine ; Cyclization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Synthese von neuen 1-Benzyl-7-alkyl-2,3-dimethyl-4-oxopyrrolo[2,3-b]pyridin-5-carbonsäuren durch Verwendung von 5,6-Dimethyl-2,4-dioxopyrrolo[2,3-d][1,3]oxazinen als Ausgangsmaterial wird beschrieben. Die antimikrobielle Aktivität dieser Substanzen wurde geprüft.
    Notes: Summary A synthetic approach to new 1-benzyl-7-alkyl-2,3-dimethyl-4-oxopyrrolo[2,3-b]pyridine-5-carboxylic acids using 5,6-dimethyl-2,4-dioxopyrrolo[2,3-d][1,3]oxazine as the starting material is reported. The antimicrobial activity of these compound is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811472
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  • 9
    Electronic Resource
    Electronic Resource
    Inverse kinematics of spherical wrist robot arms: Analysis and simulation (1992)
    Springer
    Journal of intelligent and robotic systems 5 (1992), S. 211-227 
    Details
    ISSN: 1573-0409
    Keywords: Robot inverse kinematics ; arms ; real-time control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spherical wrist robot arm is the most common type of industrial robot. This paper presents an efficient analytical computation procedure of its inverse kinematics. It is based on the decomposition of the inverse kinematic problem to two less complex problems; one concerns the robot arm basic structure and the other concerns its hand. The proposed computation procedure is used to obtain the inverse kinematic position models of two robot arms: one contains only revolute joints and the other contains both revolute and prismatic joints. The 1st and 2nd time derivatives of the obtained models give more accurate inverse kinematic velocity and acceleration models than numerical differentiation. These models are verified by simulation for two different trajectories. The obtained results demonstrate the effect of the proposed procedure on reducing the necessary computation time compared to other computation techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247418
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  • 10
    Electronic Resource
    Electronic Resource
    Computer program for the mass and heat balance calculations for the wet process phosphoric acid (hemi-hydrate) and its applications to Saudi phosphate rock (1993)
    Springer
    Nutrient cycling in agroecosystems 35 (1993), S. 169-175 
    Details
    ISSN: 1573-0867
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A computer program is developed for the wet phosphoric acid process using Saudi phosphate ore. The program concentrates on the heart of the process that is the acidulation crystallization step. The key parameters of the program are obtained from micropilot plant continuous experiments performed at our laboratory using different types of Saudi phosphate ores with different chemical, physical and minerological properties. The program is used to correlate the main operating and design parameters with the ore measurable characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750635
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