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  • 1
    Electronic Resource
    Electronic Resource
    Faltungseigenschaften von Signalen mit endlicher Energie und Beziehungen zum Verhalten des idealen Tiefpasses (1998)
    Springer
    Electrical engineering 81 (1998), S. 263-270 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents In this paper the behaviour of the causal variant of the ideal low-pass is investigated. It is shown that this system is not stable with respect to the energy norm. An input signal with finite energy is given in the paper such that the output signal has an infinite energy. This result solves a problem proposed by Professor Mathis.
    Notes: Übersicht In der Arbeit wird gezeigt, daß die kausale Variante des idealen Tiefpasses ein bezüglich der energetischen Norm instabiles System ist. Es wird ein Eingangssignal mit endlicher Energie angegeben, so daß das Ausgangssignal eine unendliche Energie besitzt. Dieses Resultat löst eine Problemstellung von Professor Mathis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01233278
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  • 2
    Electronic Resource
    Electronic Resource
    Faltungseigenschaften von Signalen mit endlicher Energie und Beziehungen zum Verhalten des idealen Tiefpasses (1998)
    Springer
    Electrical engineering 81 (1998), S. 263-270 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents In this paper the behaviour of the causal variant of the ideal low-pass is investigated. It is shown that this system is not stable with respect to the energy norm. An input signal with finite energy is given in the paper such that the output signal has an infinite energy. This result solves a problem proposed by Professor Mathis.
    Notes: Übersicht In der Arbeit wird gezeigt, daß die kausale Variante des idealen Tiefpasses ein bezüglich der energetischen Norm instabiles System ist. Es wird ein Eingangssignal mit endlicher Energie angegeben, so daß das Ausgangssignal eine unendliche Energie besitzt. Dieses Resultat löst eine Problemstellung von Professor Mathis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002020050049
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  • 3
    Electronic Resource
    Electronic Resource
    On the periodic variations of geomagnetic activity indices Ap and ap (1998)
    Springer
    Annales geophysicae 16 (1998), S. 510-517 
    Details
    ISSN: 0992-7689
    Keywords: Interplanetary physics ; Magnetic fields ; Solar wind plasma ; Solar wind – magnetosphere interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Yearly averages of geomagnetic activity indices Ap for the years 1967–1984 are compared to the respective averages of v2 · Bs, where v is the solar wind velocity and Bs is the southward interplanetary magnetic field (IMF) component. The correlation of both quantities is known to be rather good. Comparing the averages of Ap with v2 and Bs separately we find that, during the declining phase of the solar cycle, v2 and during the ascending phase Bs have more influence on Ap. According to this observation (using Fourier spectral analysis) the semiannual and 27 days, Ap variations for the years 1932–1993 were analysed separately for years before and after sunspot minima. Only those time-intervals before sunspot minima with a significant 27-day recurrent period of the IMF sector structure and those intervals after sunspot minima with a significant 28–28.5-day recurrent period of the sector structure were used. The averaged spectra of the two Ap data sets clearly show a period of 27 days before and a period of 28–29 days after sunspot minimum. Moreover, the phase of the average semiannual wave of Ap is significantly different for the two groups of data: the Ap variation maximizes near the equinoxes during the declining phase of the sunspot cycle and near the beginning of April and October during the ascending phase of the sunspot cycle, as predicted by the Russell-McPherron (R-M) mechanism. Analysing the daily variation of ap in an analogue manner, the same equinoctial and R-M mechanisms are seen, suggesting that during phases of the solar cycle, when ap depends more on the IMF-Bs component, the R-M mechanism is predominant, whereas during phases when ap increases as v increases the equinoctial mechanism is more likely to be effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0510-2
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  • 4
    Electronic Resource
    Electronic Resource
    Static and dynamic structural analysis of a saturated solution of ZnBr2 in water: Anomalous x-ray diffraction and molecular dynamics simulations (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 7239-7248 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The supposedly very simple system of a saturated solution of ZnBr2 in water exhibits unusually complex and therefore interesting structural behavior. Motivated by this, Mager did a detailed x-ray diffraction study (Th. Mager, PhD. thesis, Universität Würzburg, 1991), and we performed a long molecular dynamics (MD) simulation—using potential parameters from the general purpose GROMOS force field—of such a solution, which can be grossly characterized by the formula ZnBr2⋅3H2O. We start by calculating those properties that are directly accessible through the experiment from the MD simulation, in order to validate the physical relevance of the simulation. Seeing that the simulation delivers results that are compatible with those of the experiment, we proceed by analyzing the MD simulation in much more detail according to the static and dynamic structure of the system, thereby gaining insight into the structural behavior of ZnBr2⋅3H2O that is very difficult, if at all possible, to get from experimental studies. To this end we use the Voronoi algorithm to define coordination shells around atoms and ions in ZnBr2⋅3H2O. We study the time averaged as well as the time-resolved geometry and composition of these coordination shells and find that octahedral coordination of Zn2+ ions is the dominant geometry in ZnBr2⋅3H2O, and that these octahedra are remarkably stable (after 1 ns only 10% decayed). We further find evidence for polymerlike Zn2+ chains, where O atoms of water and Br− ions connect the Zn2+ ions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471405
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  • 5
    Electronic Resource
    Electronic Resource
    In-plane-gate transistors on nonepitaxial silicon directly written by focused-ion-beam implantation (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2538-2540 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that focused-ion-beam written in-plane-gate transistors, working at room temperature can be realized on (100) silicon-on-insulator wafers, separated by implanted oxygen, without the need for epitaxial growth processes. Typical channel widths are in the sub-μm range. Their electrical features at room temperature are characterized by transport and Hall measurements. The channel current is measured as a function of the geometrical channel width and the implanted dose. Activation of the implanted gallium by rapid thermal annealing changes the character of the insulating lines from Ohmic barriers to npn-junctions. Consequently the leakage current across the barriers decreases significantly, the direct current output characteristics of the transistors are improved with higher implantation doses and smaller geometrical channel widths are achievable. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116176
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  • 6
    Electronic Resource
    Electronic Resource
    Mixed-Signal-Algorithmen für die Echtzeit-Signalverarbeitung (1997)
    Springer
    Forschung im Ingenieurwesen 63 (1997), S. 202-205 
    Details
    ISSN: 1434-0860
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology
    Description / Table of Contents: Abstract  A mixed-signal algorithm for low-pass filtering is proposed in this paper. This algorithm shows the same behavior for a large number of signals as the low pass. For this reason the algorithm is suitable for the low pass filtering of signals with finite energy.
    Notes: Zusammenfassung  In der vorliegenden Arbeit wird ein Mixed-Signal-Verfahren für die Tiefpaßfilterung vorgeschlagen. Dieses Verfahren besitzt für eine große Klasse von Signalen das gleiche Verhalten wie der ideale Tiefpaß. Damit eignet sich das Verfahren zur Tiefpaßfilterung von Signalen mit endlicher Energie.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010833
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  • 7
    Electronic Resource
    Electronic Resource
    Higgs and background production in the reaction $$e^ + e^ - \to b\bar b + 2$$ jets at LEPII and NLC energies (1995)
    Springer
    The European physical journal 67 (1995), S. 613-620 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A complete tree-level Standard Model calculation of the reaction $$e^ + e^ - \to b\bar b + 2$$ jets in the energy range of LEPII and the Nexte +e− Linear Collider is presented. The 2-jet system represents either aq $$\bar q$$ pair or two gluons. The matrix elements were calculated by means of the package CompHEP, and phase space integration and event generation were carried out with the computer programs BASES/SPRING. Cross sections of the Higgs boson, the total background and important subsets of background are studied as functions of the c.m.s. energy and the Higgs mass, taking into account possible interferences. Various event distributions calculated for realistic integrated luminosities indicate encouraging prospects regarding the extraction of the Higgs signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01553987
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  • 8
    Electronic Resource
    Electronic Resource
    Application of INAA and XRFA in a comparative environmental study (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 204 (1996), S. 173-181 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Environmental monitoring requires reliable and effective analytical techniques for widely different concentration ranges. Two such methods (INAA and XRFA) were applied in a comparative environmental study on air dust filters and grass. The samples were collected during one year at two locations (near Bucharest/Romania and near Stuttgart/Germany) with different levels of air pollution. Seventeen environmentally relevant elements (As, Ba, Br, Ca, Co, Cr, Cu, Fe, K, Mn, Ni, Pb, S, Sb, Se, V, Zn) were determined. The aim was to test the suitability of INAA and XRFA methods for different elements in these kinds of samplesaat realistical pollution levels. The results were statistically compared for 13 elements, which were determined by both analytical techniques. They were also used to characterize the air pollution level and its variation at the two locations, and to compare them. Generally, concentrations in air of the elements studied are higher in Bucharest than in Stuttgart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060878
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  • 9
    Electronic Resource
    Electronic Resource
    Assessment of degree of fusion of rigid PVC from inverse gas chromatographic measurements (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 56 (1995), S. 51-56 
    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: Inverse gas chromatography of alkanes has been used to assess the degree of fusion of rigid polyvinyl chloride (PVC) extrudates. The relative degree of fusion is provided by ratios of the retention volumes of the alkane probe molecules in the bulk of the PVC. This method is nonintrusive and can be used to measure degree of fusion quantitatively if a completely fused reference material can be provided. The present analysis involves evaluations of the contributions to the overall retention volume of the alkane probes, resulting from adsorption and from bulk diffusion. The diffusivity of the alkanes was clearly dependent on the processing history of the PVC extrudate. A direct variation was observed between the size of the diffusing molecules and their residence time as adsorbates on the polymer surface. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070560107
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  • 10
    Electronic Resource
    Electronic Resource
    Comments on “start up pressure transients in a capillary rheometer” by Savvas G. Hatzikiriakos and John M. Dealy, Polym. Eng. Sci., 34, 493 (1994) (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 1481-1481 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760351809
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