105,126 research outputs found
Register / bearbeitet von Holger Hansen
No full textREGISTER / BEARBEITET VON HOLGER HANSEN
Bibliotheca Germanorum erotica & curiosa (-)
Register / bearbeitet von Holger Hansen (Register) ([1])
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Thorkild Hansen
No full textThis is a short presentation of the main works of the Danish author Thorkild Hansen
A tool for analysing depth resolution in potential-field inversion: application to the Neapolitan Volcanic Area
No full textA careful management of the data errors in potential field inversion is crucial for obtaining reliable information about the source distribution with respect to depth. The Depth Resolution Plot introduced by Fedi, Hansen and Paoletti provides a convenient tool for this analysis: it allows a computational/visual analysis of how much the depth resolution in a potential-field inversion problem is influenced by the way the problem is discretized and regularized. Here we present a variant of the Depth Resolution Plot, called Approx Depth Resolution Plot, which is better suited for large-scale problems, and we employ it to study the retrievable depth resolution in the inversion of the gravity field of the Neapolitan Volcanic Area
The significance of the Hansen Ideal space frame
No full textKnown and unknown properties of Hansen Ideal coordinates are summarized. It is shown that the ideal space frame is a general and necessary component of basic celestial mechanics and astrodynamics, as well as of any theory of motion. A typical consequence is the intimate correlation of the Hansen frame with the Lagrange constraint within the method of the variation of the parameters. The use of observations in the ideal frame may allow conclusions on the intergalactic fundamental coordinate system
Validation of the FACSCount AF system for determination of sperm concentration in boar semen
No full textA flow cytometric method has been developed for rapid determination of sperm concentration in semen from various mammalian species.* All cells containing DNA are stained with SYBR-14 or propidium iodide (PI) and sperm concentration is determined in relation to an internal standard of fluorescent microspheres ( beads). Satisfactory staining can be achieved within 2-3 min and the following flow cytometric analysis on the FACSCount AF System rapidly provides the user with a precise and accurate assessment of the sperm concentration. In this study, the FACSCount AF System and Sperm Counting Reagent ( BD Biosciences) was compared with microscopic counting using a Burker-Turk haemocytometer. In addition, sperm concentration was determined using the Corning 254 spectrophotometer which is used routinely by Danish artificial insemination stations for boars. The results show that the agreement between flow cytometry and microscopic counting is very high. The slope for the regression line was 1.12 (SE = 0.03) with an estimated intercept with the Y-axis of 22 x 10(6) sperm/ml (SE = 10 x 10(6) sperm/ml) and an estimated error of the model of 10 x 10(6) sperm/ml. For the spectrophotometer, the slope of the regression line was 1.09 (SE = 0.07) with an estimated intercept of 137 x 10(6) sperm/ml (SE = 25 x 10(6) sperm/ml). The average error made by the spectrophotometer was 55 x 10(6) sperm/ml. In addition, the results obtained using flow cytometry was highly repeatable ( CV = 2.7%) in comparison with the spectrophotometric method ( CV = 6.3%). These results indicate that the FACSCount AF System is a valuable tool for precise and accurate assessment of sperm concentration in boar semen and that use of this system may lead to production of more uniform insemination doses containing a specific number of sperm per dose
Evaluating Asset-Pricing Models Using The Hansen-Jagannathan Bound: A Monte Carlo Investigation
No full textWe conduct Monte Carlo experiments to examine whether the bound proposed by Hansen and Jagannathan (1991) is a useful device for evaluating asset pricing models. Specifically, we use recently developed statistical tests, which are based on a 'distance' between the model and the Hansen-Jagannathan bound, to compute the rejection rates of true models. We provide finite-sample critical values for asset pricing models with time separable preferences, and show how they depend upon nuisance parameters—risk aversion and the rate of time preference. Further, we show that the finite-sample distribution of the test statistic associated with the risk-neutral case is extreme, in the sense that critical values based on this distribution will deliver type I errors no larger than intended—regardless of risk aversion or the rate of time preference. Extending the analysis to accommodate other preferences, we show that in the state non-separable case, the small-sample distributions of the test statistics are influenced significantly by the degree of intertemporal substitution, but not by attitudes toward risk. For habit formation preferences, the small-sample distributions are strongly influenced by the habit parameter. However, the maximal-size critical values for time-separable preferences are appropriate for habit formation as well as state non-separable preferences. We conclude that with these critical values the HJ bound is indeed a useful evaluation device. We then use the critical values to evaluate three asset pricing models using U.S. data. We find evidence against the time-separable model and mixed evidence on the remaining two models.
Solution of Macromodels with Hansen-Sargent Robust Policies: Some Extensions
No full textWe summarize some methods useful in formulating and solving Hansen-Sargent robust control problems, and suggest extensions to discretion and simple rules. Matlab, Octave, and Gauss software is provided. We illustrate these extensions with applications to the term structure of interest rates, the time inconsistency of optimal monetary policy, the effects of expectations on the variances of inflation and output, and on whether central banks should make their forecasts public.robustness; model uncertainty; discretion; simple rules
Paranarthrura subtilis Hansen 1913
No full textParanarthrura subtilis Hansen, 1913 Hansen (1913): 124-125; plate XII fig 4 a–d. Stephensen (1932): 351. Lang (1971 b) 373–376; figs 6–7. Bird & Holdich (1989): 158; figs 1g, 9. Brandt (1993): 570. Guerrero-Kommritz et al (2002): 10. Guerrero-Kommritz (2003): 3. Larsen (2005): 121, 140. Identification reference. Hansen (1913), Lang (1971 b), Bird & Holdich (1989). Distribution records from the AFEN, BIOFAR & BIOICE surveys. Recorded from 26 BIOICE samples, from the Denmark Strait, Greenland-Iceland Rise, Iceland Basin, Iceland Shelf (West), Irminger Basin, and Reykjanes Ridge, at depths 164–1099 m. No records from the AFEN and BIOFAR surveys. Distribution elsewhere. Davis Strait, 582 m (Hansen 1913); North Feni Ridge to the South Biscay Slope, 1160–1739 m (Bird & Holdich 1989); Kolbeinsey Ridge (north of Iceland), 940 m (Brandt 1993). Remarks. The record of a single specimen of P. subtilis from 940 m on the Kolbeinsey Ridge (north of Iceland) by Brandt (1993) is the sole example of the Agathotanaidae from this Polar-influenced region. Otherwise, the species has been recorded in the present study where benthic temperatures are in the range 2–5 o C (mode 4 o C). A considerable shallowing of the recorded upper bathymetric is evident, from 582 m to 164 m (on the West Icelandic Shelf). It is sometimes abundant in samples, with three stations where over one hundred specimens have been collected: 313 specimens in BIOICE Stn 2427 (Iceland Basin, 778 m), 114 specimens in BIOICE Stn 2415 (Iceland Basin, 819 m) and 109 specimens in BIOICE Stn 2873 (Irminger Basin, 555 m).Published as part of Bird, Graham J, 2010, Tanaidacea (Crustacea, Peracarida) of the North-east Atlantic: the Agathotanaidae of the AFEN, BIOFAR and BIOICE projects, with a description of a new species of Paragathotanais Lang, pp. 1-22 in Zootaxa 2730 on page 14, DOI: 10.5281/zenodo.20014
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