186 research outputs found
The Danish runestones: when and where?
This article concerns the dating and distribution of Danish runestones from the eighth to the eleventh centuries. On the basis of both old and more recent investigations, the runestones are divided into five chronological periods each with their own characteristics and according to typological features regarding runes, language, style, and ornament. The majority of Danish runestones were erected within two generations after the conversion around AD 970–1020/25 and probably as a result of the stress and societal changes in connection with the advent of Christianity. The geographical distribution changed dramatically during the 400 year long runestone period and was probably due to the changing political situation. In the eighth and ninth centuries, runestones were mainly erected on Fyn, Sjælland, and Skåne. Runestones were almost exclusively erected in Jutland in the tenth century before the conversion and in the decades around the year 1000, runestones were erected in the north-eastern parts of Jutland and along the coast in Skåne. The runestone fashion died out in most parts of Denmark during the eleventh century, although on Bornholm the tradition began in the early eleventh century and came to an end within afew generations in the late eleventh century or around AD 1100
Nye fund af runer i Ribe
The article deals with the excavated finds of runic inscriptions in Ribe, during the campaigns in 2017–18. The fragment of a supposed bone plate is carved with runes on one side, whereas a fragmented antler comb is carved with runes on both sides. The bone plate dates to the mid- or late nineth century, whereas the comb has a slightly earlier date to the first half of the nineth century. Suggestions for readings and interpretations of the inscriptions are put forward as well as discussions of the linguistic stage of the texts. Of special interest is the word kąbaʀ, Old Danish kambr, which includes either an epenthetic vowel or a preserved stem vowel. On the basis of linguistic analyses and contemporary Danish finds, it is argued that the inscription contains an epenthetic vowel. Finally, the inscriptions are discussed in relation to the distribution of runic inscriptions in early town environments
Ce-L3-XAS study of the temperature dependence of the 4f occupancy in the Kondo system Ce2Rh3Al9
We have used temperature dependent x-ray absorption at the Ce-L3 edge to
investigate the recently discovered Kondo compound Ce2Rh3Al9. The systematic
changes of the spectral lineshape with decreasing temperature are analyzed and
found to be related to a change in the occupation number, n_f, as the
system undergoes a transition into a Kondo state. The temperature dependence of
indicates a characteristic temperature of 150K, which is clearly related
with the high temperature anomaly observed in the magnetic susceptibility of
the same system. The further anomaly observed in the resistivity of this system
at low temperature (ca. 20K) has no effect on n_f and is thus not of Kondo
origin.Comment: 7 pages, three figures, submitted to PR
Photoemission and x-ray absorption study of MgC_(1-x)Ni_3
We investigated electronic structure of MgC_(1-x)Ni_3 with photoemission and
x-ray absorption spectroscopy. Both results show that overall band structure is
in reasonable agreement with band structure calculations including the
existence of von Hove singularity (vHs)near E_F. However, we find that the
sharp vHs peak theoretically predicted near the E_F is substantially
suppressed. As for the Ni core level and absorption spectrum, there exist the
satellites of Ni 2p which have a little larger energy separation and reduced
intensity compared to the case of Ni-metal. These facts indicate that
correlation effects among Ni 3d electrons may be important to understand
various physical properties.Comment: 12 pages, 4 figure
Micro- and nanosystems for biology and medicine
The development of new tools and instruments for biomedical applications based on nano- (NEMS) or microelectromechanical systems technology (MEMS) are bridging the gap between the macro- and the nano-world. The well mastered microtechnique allows controlling many parameters of these instruments, which is essential for conducting reproducible and repeatable experiments in the life sciences. Examples are multifunctional scanning probe sensors for cell biology, an arthroscopic scanning force microscope for minimally invasive medical interventions and a nanopore sensor for single molecule experiments in biochemistry. This paper reviews some of the activities conducted in a fruitful interdisciplinary collaboration between physicists, engineers, biologists and physicians
Superconducting gap in the presence of bilayer splitting in underdoped Bi(Pb)2212
The clearly resolved bilayer splitting in ARPES spectra of the underdoped
Pb-Bi2212 compound rises the question of how the bonding and antibonding sheets
of the Fermi surface are gapped in the superconducting state. Here we compare
the superconducting gaps for both split components and show that within the
experimental uncertainties they are identical. By tuning the relative intensity
of the bonding and antibonding bands using different excitation conditions we
determine the precise {\bf k}-dependence of the leading edge gap. Significant
deviations from the simple cos()-cos() gap function for the
studied doping level are detected.Comment: 5 pages, 4 figures (revtex4
Doping Dependence of the Chemical Potential in Cuprate High- Superconductors I: LaSrCuO
The names of the authors, which were inadvertedly lacking in the tex-file
submitted two days ago, have been added.Comment: 10 pages, figures on request. Revtex, version 2, Materials Science
Center Internal Report Number VSGD.94.6.
Hole Doping Evolution of the Quasiparticle Band in Models of Strongly Correlated Electrons for the High-T_c Cuprates
Quantum Monte Carlo (QMC) and Maximum Entropy (ME) techniques are used to
study the spectral function of the one band Hubbard model
in strong coupling including a next-nearest-neighbor electronic hopping with
amplitude . These values of parameters are chosen to improve the
comparison of the Hubbard model with angle-resolved photoemission (ARPES) data
for . A narrow quasiparticle (q.p.) band is observed in the
QMC analysis at the temperature of the simulation , both at and away
from half-filling. Such a narrow band produces a large accumulation of weight
in the density of states at the top of the valence band. As the electronic
density decreases further away from half-filling, the chemical
potential travels through this energy window with a large number of states, and
by it has crossed it entirely. The region near momentum
and in the spectral function is more sensitive to doping
than momenta along the diagonal from to . The evolution with
hole density of the quasiparticle dispersion contains some of the features
observed in recent ARPES data in the underdoped regime. For sufficiently large
hole densities the ``flat'' bands at cross the Fermi energy, a
prediction that could be tested with ARPES techniques applied to overdoped
cuprates. The population of the q.p. band introduces a {\it hidden} density in
the system which produces interesting consequences when the quasiparticles are
assumed to interact through antiferromagnetic fluctuations and studied with the
BCS gap equation formalism. In particular, a region of extended s-wave is found
to compete with d-wave in the overdoped regime, i.e. when the chemical
potential has almost entirely crossed the q.p.Comment: 14 pages, Revtex, with 13 embedded ps figures, submitted to Phys.
Rev. B., minor modifications in the text and in figures 1b, 2b, 3b, 4b, and
6
Matrilineal diversity and population history of Norwegians
Background
While well known for its Viking past, Norway's population history and the influences that have shaped its genetic diversity are less well understood. This is particularly true with respect to its demography, migration patterns, and dialectal regions, despite there being curated historical records for the past several centuries. In this study, we undertook an analysis of mitochondrial DNA (mtDNA) diversity within the country to elaborate this history from a matrilineal genetic perspective.
Methods
We aggregated 1174 partial modern Norwegian mtDNA sequences from the published literature and subjected them to detailed statistical and phylogenetic analysis by dialectal regions and localities. We further contextualized the matrilineal ancestry of modern Norwegians with data from Mesolithic, Iron Age, and historic period populations.
Results
Modern Norwegian mtDNAs fell into eight West Eurasian (N, HV, JT, I, U, K, X, W), five East Eurasian (A, F, G, N11, Z), and one African (L2) haplogroups. Pairwise analysis of molecular variance (AMOVA) estimates for all Norwegians indicated they were differentiated from each other at 1.68% (p < 0.001). Norwegians within the same dialectal region also showed genetic similarities to each other, although differences between subpopulations within dialectal regions were also observed. In addition, certain mtDNA lineages in modern Norwegians were also found among prehistoric and historic period populations, suggesting some level of genetic continuity over hundreds to many thousands of years.
Conclusions
This analysis of mtDNA diversity provides a detailed picture of the genetic variation within Norway in light of its topography, settlement history, and historical migrations over the past several centuries.publishedVersio
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