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  • Springer  (2,442)
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  • 1
    Electronic Resource
    Electronic Resource
    Landscape-Level Phenology of a Threatened Butterfly: A GIS-Based Modeling Approach (1998)
    Springer
    Ecosystems 1 (1998), S. 299-309 
    Details
    ISSN: 1435-0629
    Keywords: Key words: butterfly; phenology; topoclimate; insolation; Geographic Information System (GIS); spatially explicit; weather; insect.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT Phenology of organismal development varies between growing seasons according to the weather and also varies within growing seasons across topoclimatic gradients. Combining these factors is necessary to predict landscape-level patterns of phenology and their consequences for population dynamics. We developed a model on a Geographic Information System (GIS) that predicts phenology of adult emergence of the threatened Bay checkerspot butterfly across complex terrain under variable weather. Physiological time was modeled by accumulated slope-specific direct insolation. Insolation sums through growing seasons were calculated for each cell of a digital terrain model (skipping over cloudy days) until a threshold for adult emergence was reached. Emergence times of adult butterflies for a given year were then mapped out across a 100-ha area. To generate predicted emergence curves for the population in a given year, these maps ofemergence times were then modified by incorporating microdistributions of postdiapause larvae. Different larval microdistributions changed both the magnitude and shape of emergence curves under the same yearly weather and could change mean population-wide emergence dates by 11 days. Reproductive success in this butterfly is strongly dependent on the timing of adult emergence, and these models provide insights into the effects of weather, topography, and population history on population dynamics. Because adult emergence phenology is often a key component of reproductive success for insects, understanding the components of phenological variation in space and time in complex terrain may provide insights into population dynamics for management of pests and conservation of rare species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100219900023
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  • 2
    Electronic Resource
    Electronic Resource
    Über eine neue Siliziumdioxyd-Modifikation mit Faserstruktur und Kettenmolekeln (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 12-12 
    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/BF00622354
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  • 3
    Electronic Resource
    Electronic Resource
    Optimal control of stable weakly regular linear systems (1997)
    Springer
    Mathematics of control, signals, and systems 10 (1997), S. 287-330 
    Details
    ISSN: 1435-568X
    Keywords: Regular linear system ; Optimal cost operator ; Riccati equation ; Popov function ; Spectral factor ; Feedthrough operator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics , Technology
    Notes: Abstract The paper extends quadratic optimal control theory to weakly regular linear systems, a rather broad class of infinite-dimensional systems with unbounded control and observation operators. We assume that the system is stable (in a sense to be defined) and that the associated Popov function is bounded from below. We study the properties of the optimally controlled system, of the optimal cost operatorX, and the various Riccati equations which are satisfied byX. We introduce the concept of an optimal state feedback operator, which is an observation operator for the open-loop system, and which produces the optimal feedback system when its output is connected to the input of the system. We show that if the spectral factors of the Popov function are regular, then a (unique) optimal state feedback operator exists, and we give its formula in terms ofX. Most of the formulas are quite reminiscent of the classical formulas from the finite-dimensional theory. However, an unexpected factor appears both in the formula of the optimal state feedback operator as well as in the main Riccati equation. We apply our theory to an extensive example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01211550
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  • 4
    Electronic Resource
    Electronic Resource
    Thickness determination from the GDOS depth profiles using piece-wise linear model functions (1992)
    Springer
    Microchimica acta 107 (1992), S. 81-89 
    Details
    ISSN: 1436-5073
    Keywords: depth profiling ; glow discharge optical spectroscopy ; thickness determination ; piece-wise linear functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A data processing method is presented making it possible to determine thin film thickness from GDOS depth profiles. It consists of fitting a piece-wise linear function to the depth profile and in using positions (abscissae) of their knots as parameters which are proportional to film thickness. For thickness calibration, such a linear combination of these parameters is used, which gives minimum variation coefficient of the residuals between the real and the estimated thickness of calibration samples. Relative error lower than 3% was obtained in calibration using 4 samples with nickel film thickness ranging from 0.1 to 8.3 μm, each analyzed four times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01772357
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  • 5
    Electronic Resource
    Electronic Resource
    Low-cost analogue tape recorder using an ordinary ‘hi-fi’ cassette player (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 683-687 
    Details
    ISSN: 1741-0444
    Keywords: Physiological signals ; Recorder
    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/BF02440917
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  • 6
    Electronic Resource
    Electronic Resource
    GLM versus CCA spatial modeling of plant species distribution (1999)
    Springer
    Plant ecology 143 (1999), S. 107-122 
    Details
    ISSN: 1573-5052
    Keywords: Constrained ordination ; Disturbances ; Logistic regression ; Model comparison ; Plant distribution ; Spatial modeling ; Spring Mountains (Nevada)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Despite the variety of statistical methods available for static modeling of plant distribution, few studies directly compare methods on a common data set. In this paper, the predictive power of Generalized Linear Models (GLM) versus Canonical Correspondence Analysis (CCA) models of plant distribution in the Spring Mountains of Nevada, USA, are compared. Results show that GLM models give better predictions than CCA models because a species-specific subset of explanatory variables can be selected in GLM, while in CCA, all species are modeled using the same set of composite environmental variables (axes). Although both techniques can be readily ported to a Geographical Information System (GIS), CCA models are more readily implemented for many species at once. Predictions from both techniques rank the species models in the same order of quality; i.e. a species whose distribution is well modeled by GLM is also well modeled by CCA and vice-versa. In both cases, species for which model predictions have the poorest accuracy are either disturbance or fire related, or species for which too few observations were available to calibrate and evaluate the model. Each technique has its advantages and drawbacks. In general GLM will provide better species specific-models, but CCA will provide a broader overview of multiple species, diversity, and plant communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009841519580
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  • 7
    Electronic Resource
    Electronic Resource
    Noncontacting strain measurements at high temperatures by the digital laser speckle technique (2000)
    Springer
    Experimental mechanics 40 (2000), S. 98-105 
    Details
    ISSN: 1741-2765
    Keywords: Strain measurement ; digital speckle correlation technique ; thermal strain ; large mechanical strain ; high test temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a newly developed laser-based noncontacting strain sensor suitable for temperatures up to 1200°C, which was adapted to a commercial tensile testing machine equipped with an electrical furnace. The principle of the strain sensor is based on tracking laser speckles through a digital correlation technique. Furthermore, the description of the signal processing and the optical arrangement is presented. Based on the experimental data, it can be show that this simple, laser-based strain sensor can be used successfully for the determination of mechanical and thermal strains up to temperatures of about 1200°C. Using a special data-processing procedure, it was feasible to minimize decorrelation effects caused by changes in the specimen surface due to, for example, slipband and microcrack formation, surface oxidation and phase transformation and, thus, measure large mechanical strains. The strain resolution for the selected setup was about 20 microstrains depending on the testing parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327556
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  • 8
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    Selection of Staphylococcus carnosus strains based on in vitro analysis of technologically relevant physiological activities (2015)
    Springer
    Details
    Publication Date: 2015-07-31
    Print ISSN: 1590-4261
    Electronic ISSN: 1869-2044
    Topics: Biology
    Published by Springer
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  • 9
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    Noncontacting strain measurements at high temperatures by the digital laser speckle technique (2000)
    Springer
    Details
    Publication Date: 2000-03-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Ein schnell messendes Laser-Speckle-Extensometer zur Bestimmung von statischen und dynamischen Materialparametern (2000)
    Springer
    Details
    Publication Date: 2000-04-01
    Print ISSN: 0932-383X
    Electronic ISSN: 1613-7620
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Published by Springer
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