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  • 1
    Electronic Resource
    Electronic Resource
    Calculation of two-center integrals involving a rapidly oscillating free electron wave function (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 182-194 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical potentials are used in a quantum mechanical treatment of loss processes, e.g., ionization, where the loss of flux is described by the imaginary part. We present a numerical method for calculating two-center two-electron integrals necessary to construct the imaginary part of the optical potential. By introducing Slater-type orbitals with complex-valued exponents (CSTOs), we are able to represent the free electron wave with a limited number of CSTOs. For the representation of free electron wave functions with many oscillations, i.e., in a large r range or for a high kinetic energy, these new CSTOs form a more natural set of basis functions. The introduction of CSTOs is inevitable for the calculation of integrals concerning collisions in the mK energy range, where the interaction acts over large internuclear distances. Extensive numerical checks show that the final imaginary part of the optical potentials can be calculated with an accuracy better than 2%. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473034
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  • 2
    Electronic Resource
    Electronic Resource
    Nutrient dynamics in small mesotrophic fens surrounded by cultivated land (1983)
    Springer
    Oecologia 60 (1983), S. 25-33 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a typical Dutch polder landscape the effects of nutrient transport from cultivated grassland to mesotrophic fen communities were studied. In a comparative approach, biomass production and nutrient (N, P and K) uptake were determined monthly in four fens and a hayfield differeing in productivity and species composition. The interstitial ground water was sampled every two weeks for determinations of inorganic nutrient concentrations. The differences in productivity between the fens were clearly reflected in the amount of N, P and K taken up in the above-ground vegetation. N and P proved to be limiting plant growth in the fens, whereas K was the main limiting factor in the hayfield. The ground water welling up from the sandy bottom into the fens proved to be rich in ammonia (3–5 ppm). There are strong indications that this continual seepage leads to a considerable input of N into the fens but not to a higher productivity, as the ammonia is absorbed by the lowermost peat layers covering the sand. At this moment, the differences in productivity between the fens must be caused by differences in the rates of mineralization of the superficial peat layer. The degree of fixation of the floating vegetation mat, determining whether or not low water levels lead to an aerated soil top layer, is important in this respect. Within a period of decades, however, the continuous inflow of ammonia may eventually cause an increase in the productivity and a change in the species composition of the fens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379316
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  • 3
    Electronic Resource
    Electronic Resource
    Use of deterministic sampling for exploring likelihoods in linkage analysis for quantitative traits (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 130-139 
    Details
    ISSN: 1432-2242
    Keywords: Key words QTL  ;  Linkage  ;  Maximum likelihood  ; Deterministic sampling  ;  Experimental design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Deterministic sampling was used to numerically evaluate the expected log-likelihood surfaces of QTL-marker linkage models in large pedigrees with simple structures. By calculating the expected values of likelihoods, questions of power of experimental designs, bias in parameter estimates, approximate lower-bound standard errors of estimates and correlations among estimates, and suitability of statistical models were addressed. Examples illustrated that bracket markers around the QTL approximately halved the standard error of the recombination fraction between the QTL and the marker, although they did not affect the standard error of the QTL’s effect, that overestimation of the distance between the markers caused overestimation of the distance between the QTL and marker, that more parameters in the model did not affect the accuracy of parameter estimates, that there was a moderate positive correlation between the estimates of the QTL effect and its recombination distance from the marker, and that selective genotyping did not introduce bias into the estimates of the parameters. The method is suggested as a useful tool for exploring the power and accuracy of QTL linkage experiments, and the value of alternative statistical models, whenever the likelihood of the model can be written explictly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050104
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  • 4
    Electronic Resource
    Electronic Resource
    Use of deterministic sampling for exploring likelihoods in linkage analysis for quantitative traits (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 130-139 
    Details
    ISSN: 1432-2242
    Keywords: QTL ; Linkage ; Maximum likelihood ; Deterministic sampling ; Experimental design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Deterministic sampling was used to numerically evaluate the expected log-likelihood surfaces of QTL-marker linkage models in large pedigrees with simple structures. By calculating the expected values of likelihoods, questions of power of experimental designs, bias in parameter estimates, approximate lower-bound standard errors of estimates and correlations among estimates, and suitability of statistical models were addressed. Examples illustrated that bracket markers around the QTL approximately halved the standard error of the recombination fraction between the QTL and the marker, although they did not affect the standard error of the QTL's effect, that overestimation of the distance between the markers caused overestimation of the distance between the QTL and marker, that more parameters in the model did not affect the accuracy of parameter estimates, that there was a moderate positive correlation between the estimates of the QTL effect and its recombination distance from the marker, and that selective genotyping did not introduce bias into the estimates of the parameters. The method is suggested as a useful tool for exploring the power and accuracy of QTL linkage experiments, and the value of alternative statistical models, whenever the likelihood of the model can be written explictly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222963
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  • 5
    Electronic Resource
    Electronic Resource
    Power of two and three-generation QTL mapping experiments in an outbred population containing full-sib or half-sib families (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1115-1124 
    Details
    ISSN: 1432-2242
    Keywords: QTL mapping ; Experimiental design ; Stastistical power ; Outbred population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract QTL mapping experiments involve many animals to be genotyped and performance tested. Consequently, experimental designs need to be optimized to minimize the costs of data collection and genotyping. The present study has analyzed the power and efficiency of experiments with two or three-generation family structures containing full-sib families, half-sib families, or both. The focus was on data from one outbred population because the main interest is to locate genes that can be used for within-line selection. For a two generation experiment more animals had to be typed for marker loci to obtain a certain power than for a three generation experiment. Fewer trait values, however, had to be obtained for a two-generation experiment than for a three-generation experiment. A two or three-generation family structure with full-sib offspring was more efficient than a two or three-generation family structure with half-sib offspring. A family structure with full-sib grand-offspring, however, was less efficient than a family structure with half-sib grand-offspring. For the most efficient family structure each pair of parents had full-sib offspring that were genotyped for the marker. For the most-efficient family structure each full-sib offspring had half-sib grand-offspring for which trait values were obtained. For equal power with a heritability of 0.1 and 100 grand-offspring per full-sib offspring, 30-times less marker typings were required for this most efficient family structure than for a two-generation half-sib structure in which marker genotypes and trait values were obtained for half-sib offspring. The effect of heritability and the type of analysis (single marker or interval analysis) on the efficiency of a family structure is described. The results of this study should help to design QTL mapping experiments in an outbred population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223929
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  • 6
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    Study of precessional switching speed control in voltage-controlled perpendicular magnetic tunnel junction (2020)
    American Institute of Physics
    Details
    Publication Date: 2020-03-01
    Electronic ISSN: 2158-3226
    Topics: Physics
    Published by American Institute of Physics
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  • 7
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    Automatic detection system for multiple region of interest registration to account for posture changes in head and neck radiotherapy (2014)
    Institute of Physics
    Details
    Publication Date: 2014-04-02
    Print ISSN: 0031-9155
    Electronic ISSN: 1361-6560
    Topics: Biology , Medicine , Physics
    Published by Institute of Physics
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  • 8
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    The magneto-optical Kerr effect for efficient characterization of thermal stability in dense arrays of p-MTJs (2019)
    American Institute of Physics
    Details
    Publication Date: 2019-12-01
    Electronic ISSN: 2158-3226
    Topics: Physics
    Published by American Institute of Physics
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  • 9
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    Calibrating a large-extent high-resolution coupled groundwater-land surface model using soil moisture and discharge data (2013)
    Wiley
    Details
    Publication Date: 2013-12-27
    Description: We explore the possibility of using remotely-sensed soil moisture data and in-situ discharge observations to calibrate a large-extent hydrological model. The model used is PCR-GLOBWB-MOD, which is a physically-based and fully-coupled groundwater-land surface model operating at a daily basis and having a resolution of 30 arc-second (about 1 km at the equator). As a test bed, we use the combined Rhine-Meuse basin (total area: about 200 000 km 2 ), where there are 4250 point-scale observed groundwater head time series that are used to verify the model results. Calibration is performed by simulating 3045 model runs with varying parameter values affecting groundwater head dynamics. The simulation results of all runs are evaluated against the remotely sensed soil moisture time series of SWI (Soil Water Index) and field discharge data. The former is derived from European Remote Sensing scatterometers and provides estimates of the first meter profile soil moisture content at 30 arc-minute resolution (50 km at the equator). From the evaluation of these runs, we then introduce a step-wise calibration approach that considers stream discharge first, then soil moisture, and finally verify the resulting simulation to groundwater head observations. Our results indicate that the remotely sensed soil moisture data can be used for the calibration of upper soil hydraulic conductivities determining simulated groundwater recharge of the model. However, discharge data should be included to obtain full calibration of the coupled model, specifically to constrain aquifer transmissivities and runoff-infiltration partitioning processes. The step-wise approach introduced in this study, using both discharge and soil moisture data, can calibrate both discharge and soil moisture, as well as predicting groundwater head dynamics with acceptable accuracy. As our approach to parameterize and calibrate the model uses globally available data sets only, it opens up the possibility to set up large extent coupled groundwater-land surface models in other basins or even globally.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Autoionization widths for Ne*(3s)-Ar and Ne**(3p)-Ar collisions (1991)
    American Physical Society
    Details
    Publication Date: 1991-07-01
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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