38,608 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])
Cover ( - )
Title page ([1])
Preface ([3])
A (5)
B (19)
C (40)
D (48)
E (58)
F (73)
G (85)
H (104)
I (122)
J (124)
K (129)
L (142)
M (160)
N (177)
O (186)
P (189)
Q (202)
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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
Thorkild Hansen
No full textThis is a short presentation of the main works of the Danish author Thorkild Hansen
Replication Data for: Living Together, Voting Together: Voters moving in together before an election have higher turnout
No full textThe readme for the replication archive for "Living Together, Voting Together: Voters moving in together before an election have higher turnout"
by Dahlgaard JO, Bhatti Y, Hansen JH and Hansen KM*
published in British Journal of Political Science
Year 2021
*Corresponding author: Department of Political Science, University of Copenhagen, [email protected], www.kaspermhansen.eu. Øster Farimagsgade 5, 1353 Copenhagen K, Denmark, Cell +45 51245005.
The administrative data used for most files are not part of the replication archive as they can not be share according to Statistics Denmark's Terms & Conditions.
PLease see https://www.dst.dk/en/TilSalg/Forskningsservice# about general access to Statistics Denmark data for research
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
Higginsarctus lassei Hansen & Kristensen 2021, gen. et sp. nov.
No full text<i>Higginsarctus lassei</i> gen. et sp. nov. <p>urn:lsid:zoobank.org:act: 5086AB3C-F4CD-48ED-AE57-6D35C2EB14D7</p> <p>Figs 10–11</p> <p> <b>Diagnosis</b> (characters uniquely defining the taxon are written in bold)</p> <p> Characterized by <b>flat, oval secondary clavae</b>. Unilobed antero-lateral alae with weakly undulating distal margins without indentations. Bilobed medio-lateral alae with medial pointed indentations.</p> <p>Medio-lateral alae smaller than antero-lateral alae. Bilobed postero-lateral alae with a medial arched identation. Postero-lateral alae larger than antero-lateral alae. Quadrilobed, rectangular caudal ala with 3 arched indentations, 1 medial and 2 lateral. Medial lobes of caudal ala smaller than lateral lobes. Leg sense organs I–III with similar length. Genital stoup present.</p> Etymology <p>The new species is dedicated to Lasse G. Hansen, the son of the first author.</p> Material examined <p> <b>Holotype</b> CHILE • ♀; South Pacific Ocean; 33°53′ S, 87°51′ W; depth 2475 m; 17 Jul. 1966; R.P. Higgins leg.; (RH 1270), R/V <i>Anton Bruun</i>, cruise 17; NHMD-293913.</p> Description <p>HABITUS. The holotypic female (Figs 10–11) is 143 µm long from the anterior margin of the head to the posterior margin of the body. The body is ovoid, being broadest (89 µm) at the level between the second and third pair of legs. The dorsal cuticle has four transverse inter-segmental folds: one anterior to the first pair of legs, two between the first and second pair of legs and one between the second and third pair of legs.</p> <p>ALAE. Typical for the genus, eight alae, which are all clearly separated from each other, are present: frontal ala, a pair of antero-lateral alae, a pair of medio-lateral alae, a pair of postero-lateral alae and a single caudal ala (Figs 10, 11A). The antero-lateral alae are unilobed with weakly undulating distal margins without indentations. The medio-lateral alae which are smaller than the antero-lateral alae, each have a medial pointed indentation dividing each ala into two lobes of equal size. The postero-lateral alae which are larger than both the antero-lateral and medio-lateral alae, each have a medial arched indentation in the distal margin, dividing the ala into two lobes of equal size. The caudal ala has a deep medial, arched indentation and a pair of lateral, arched indentations dividing the ala into four lobes. The medial lobes are smaller than the lateral lobes. As in all species of the new genus, the proximal halve of the lateral and caudal alae is internally supported by continuous procuticle which sends out branching processes (ramuli) into the distal halve of the alae.</p> <p>SENSORY ORGANS. The head is well defined from the body by a constriction and a complete set of sense organs is present. All the cephalic cirri consist of an hourglass-shaped scapus, a long tubular portion and a protruding flagellum. As in most other species of Florarctinae the scapus of each cirrus appears somewhat outsized, enveloping the internal sensory structures rather than lining them. The internal cirri (41 µm) emerge from the frontal ala at the anterior margin of the head. The external cirri (28 µm) are inserted ventrally and the median cirrus (33 µm) mid-dorsally. Typical for the genus, the primary clava (58 µm) is slightly curved and non-flexible (Fig. 11C). A van der Land’s body is visible inside its base. Primary clava and lateral cirrus arise on the same cirrophore, and a common membrane (extended margin of cirrophore) surrounds the base of primary clava and lateral cirrus. A very large and thick cuticular ring supports the cirrophore internally. The secondary clavae are oval flat sacs (11 µm × 7 µm) flanking the mouth cone. The leg I sense organ (12 µm) is an unsegmented spine with a slightly swollen base and a terminal tube. The sense organs of leg II (12 µm) and III (11 µm) are unsegmented tapering spines. The fourth leg sense organ (13 µm) is an elongate papilla with a basal van der Land’s body and a terminal pore. The cirrus E (48 µm) has a prominent cirrophorus, scapus and a long tapering flagellum.</p> <p>LEGS, DIGITS AND CLAWS. The legs consist of coxa, femur, tibia and tarsus as found in all species of Florarctinae. The external digits are supported by internal hook-shaped peduncles. The external claw is simple and with a calcar. The internal claw has an accessory spine, but no calcar. All the claws are of the same size, however the external claws are thicker basally and the internal claws have an almost straight portion dorsally. An internal partition is evident as a small notch in each claw, dividing the claw in a basal portion and a distal portion.</p> <p>BUCCO- PHARYNGEAL APPARATUS. The mouth cone (Fig. 10) is large with a terminal, very refractive cupola. Only traces of the buccal tube (44 µm), stylets (47 µm), placoids and pharyngeal bulb are visible.</p> <p>REPRODUCTIVE SYSTEM. Consists of a single ovary bearing numerous small oocytes and a single larger ovum. The ovary is 72 µm long and is attached dorsally, at the level of the first pair of legs. The gonopore consists of a rosette with six large cells. Posterior to the rosette, the cuticle forms what appears in LM to be a broad fold which we interpret as the genital stoup. The two cuticular seminal receptacles each consist of a spheroid vesicle and an S-shaped genital duct. The cuticle is slightly elevated at each duct opening but does not form a true papilla. The anus is a trilobed cuticular system consisting of two large lateral lobes and a smaller posterior lobe.</p> Ecology and distribution <p>Known only from the type locality.</p>Published as part of <i>Hansen, Jesper G. & Kristensen, Reinhardt M., 2021, A new genus and five new species of the subfamily Florarctinae (Tardigrada, Arthrotardigrada), pp. 149-184 in European Journal of Taxonomy 762 (1)</i> on pages 166-170, DOI: 10.5852/ejt.2021.762.1461, <a href="http://zenodo.org/record/5211787">http://zenodo.org/record/5211787</a>
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.
The SARS-unique domain (SUD) of SARS coronavirus contains two macrodomains that bind G-quadruplexes.
No full textSince the outbreak of severe acute respiratory syndrome (SARS) in 2003, the three-dimensional structures of several of the replicase/transcriptase components of SARS coronavirus (SARS-CoV), the non-structural proteins (Nsps), have been determined. However, within the large Nsp3 (1922 amino-acid residues), the structure and function of the so-called SARS-unique domain (SUD) have remained elusive. SUD occurs only in SARS-CoV and the highly related viruses found in certain bats, but is absent from all other coronaviruses. Therefore, it has been speculated that it may be involved in the extreme pathogenicity of SARS-CoV, compared to other coronaviruses, most of which cause only mild infections in humans. In order to help elucidate the function of the SUD, we have determined crystal structures of fragment 389-652 ("SUD(core)") of Nsp3, which comprises 264 of the 338 residues of the domain. Both the monoclinic and triclinic crystal forms (2.2 and 2.8 A resolution, respectively) revealed that SUD(core) forms a homodimer. Each monomer consists of two subdomains, SUD-N and SUD-M, with a macrodomain fold similar to the SARS-CoV X-domain. However, in contrast to the latter, SUD fails to bind ADP-ribose, as determined by zone-interference gel electrophoresis. Instead, the entire SUD(core) as well as its individual subdomains interact with oligonucleotides known to form G-quadruplexes. This includes oligodeoxy- as well as oligoribonucleotides. Mutations of selected lysine residues on the surface of the SUD-N subdomain lead to reduction of G-quadruplex binding, whereas mutations in the SUD-M subdomain abolish it. As there is no evidence for Nsp3 entering the nucleus of the host cell, the SARS-CoV genomic RNA or host-cell mRNA containing long G-stretches may be targets of SUD. The SARS-CoV genome is devoid of G-stretches longer than 5-6 nucleotides, but more extended G-stretches are found in the 3'-nontranslated regions of mRNAs coding for certain host-cell proteins involved in apoptosis or signal transduction, and have been shown to bind to SUD in vitro. Therefore, SUD may be involved in controlling the host cell's response to the viral infection. Possible interference with poly(ADP-ribose) polymerase-like domains is also discussed
Revisiting the replica theory of the liquid to ideal glass transition
No full textThe replica theory of the "Random First Order Transition" (RFOT) from a supercooled liquid to an "ideal" glass of a system of "soft spheres" is revisited. Following the seminal work of M'{e}zard and Parisi (J. Chem. Phys. 111, 1076 (1999)), the number of weakly interacting replicas of the system is varied continuously from to . Relevant order parameters and the free energy of the liquid and glass phases are calculated using the hyper-netted (HNC) approximation for the pair correlation functions. The
scenario observed for all confirms the existence of two glass branches and . The latter has the lowest free energy for all , while the former has a lower free energy for , but is shown to be unstable against spinodal decomposition for any non-zero value of the attractive inter-replica coupling. The critical temperature of the RFOT turns out
to depend on , which may reflect the thermodynamic inconsistency of the HNC closure. The RFOT is predicted to be weakly first order, characterized by a small jump in density between the coexisting liquid and phases for
all . Estimating in the limit requires a proper extrapolation of high resolution HNC calculations. The present protocol allows a direct access to the free energy of the ideal glass phase below
Note on the generalized Hansen and Laplace coefficients
No full text9/11/2004Recently, Breiter \etal (2004) reported the computation of Hansen coefficients for non integer values of . In fact, the Hansen coefficients are closely related to the Laplace , and generalized Laplace coefficients (Laskar and Robutel, 1995) that do not require to be integers. In particular, the coefficients X_0^{\g,m} have very simple expressions in terms of the usual Laplace coefficients b_{\g+2}^{(m)}, and all their properties derive easily from the known properties of the Laplace coefficients
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