2,312 research outputs found
Introduction
This proceeding is the last part of a research project investigating how compensation is expressed in designing detailed development plans in areas with heritage values and architectural qualities. The overall objective of the research project has been to produce new knowledge about heritage compensation as a concept, method and tool in planning processes. The researh project have been granted funding from the Swedish National Heritage Boardâs R&D.The proceeding presents the third part of the project â the international workshop â called Architecture, cultural environment and compensation in planning processes. The workshop took place at Chalmers University of Technology in Gothenburg, 16-17 September 2019, and was organized as a joint venture between Kulturlandskapet (a cooperative heritage consultancy) and Building Design, Department of Architecture and Civil Engineering, Chalmers University of Technology. The theme in the invitation was summarized in the following way: On compensation as a concept, method and professional practice by architects, architectural conservators and archaeologists in planning processes
Cultural heritage compensation: Approaches to transformation of sites with cultural values and architectural qualities
This proceeding is the last part of a research project investigating how compensation is expressed in designing detailed development plans in areas with heritage values and architectural qualities. The overall objective of the research project has been to produce new knowledge about heritage compensation as a concept, method and tool in planning processes. The researh project have been granted funding from the Swedish National Heritage Boardâs R&D.The proceeding presents the third part of the project â the international workshop â called Architecture, cultural environment and compensation in planning processes. The workshop took place at Chalmers University of Technology in Gothenburg, 16-17 September 2019, and was organized as a joint venture between Kulturlandskapet (a cooperative heritage consultancy) and Building Design, Department of Architecture and Civil Engineering, Chalmers University of Technology. The theme in the invitation was summarized in the following way: On compensation as a concept, method and professional practice by architects, architectural conservators and archaeologists in planning processes. Ten scholars from contribute to the proceeding: Tom Davies, \ua0Athanasios Kouzelis, Mathilde Kirkegaard, Anders Larsson, Urban Nilsson, David Ross, Magnus R\uf6nn, Jennie Sj\uf6holm and Helena Ter\ue4v\ue4inen
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The Tabby cat locus maps to feline chromosome B1.
The Tabby markings of the domestic cat are unique coat patterns for which no causative candidate gene has been inferred from other mammals. In this study, a genome scan was performed on a large pedigree of cats that segregated for Tabby coat markings, specifically for the Abyssinian (Ta-) and blotched (tbtb) phenotypes. There was linkage between the Tabby locus and eight markers on cat chromosome B1. The most significant linkage was between marker FCA700 and Tabby (Z = 7.56, theta = 0.03). Two additional markers in the region supported linkage, although not with significant LOD scores. Pairwise analysis of the markers supported the published genetic map of the cat, although additional meioses are required to refine the region. The linked markers cover a 17-cM region and flank an evolutionary breakpoint, suggesting that the Tabby gene has a homologue on either human chromosome 4 or 8. Alternatively, Tabby could be a unique locus in cats
Dynamics of Electric Field Domains and Oscillations of the Photocurrent in a Simple Superlattice Model
A discrete model is introduced to account for the time-periodic oscillations
of the photocurrent in a superlattice observed by Kwok et al, in an undoped 40
period AlAs/GaAs superlattice. Basic ingredients are an effective negative
differential resistance due to the sequential resonant tunneling of the
photoexcited carriers through the potential barriers, and a rate equation for
the holes that incorporates photogeneration and recombination. The
photoexciting laser acts as a damping factor ending the oscillations when its
power is large enough. The model explains: (i) the known oscillatory static I-V
characteristic curve through the formation of a domain wall connecting high and
low electric field domains, and (ii) the photocurrent and photoluminescence
time-dependent oscillations after the domain wall is formed. In our model, they
arise from the combined motion of the wall and the shift of the values of the
electric field at the domains. Up to a certain value of the photoexcitation,
the non-uniform field profile with two domains turns out to be metastable:
after the photocurrent oscillations have ceased, the field profile slowly
relaxes toward the uniform stationary solution (which is reached on a much
longer time scale). Multiple stability of stationary states and hysteresis are
also found. An interpretation of the oscillations in the photoluminescence
spectrum is also given.Comment: 34 pages, REVTeX 3.0, 10 figures upon request, MA/UC3M/07/9
Inâplane photocurrent spectroscopy in GaAs-AlAs superlattices
The inâplane photoconductivity of GaAsâAlAs superlattices on GaAs substrates is experimentally studied as a function of the incident photon energy at different temperatures and light intensities. Superlattice and substrate are electrically isolated by a thick âAl0.3Ga0.7As barrier but connected through penetrating contacts. Depending on the transport properties of the two subsystems pseudoânegative photoconductivity can be observed, i.e., at the absorption maximum of the superlattice the photocurrent exhibits a minimum
Electromagnetic multipole theory for optical nanomaterials
Optical properties of natural or designed materials are determined by the
electromagnetic multipole moments that light can excite in the constituent
particles. In this work we present an approach to calculate the multipole
excitations in arbitrary arrays of nanoscatterers in a dielectric host medium.
We introduce a simple and illustrative multipole decomposition of the electric
currents excited in the scatterers and link this decomposition to the classical
multipole expansion of the scattered field. In particular, we find that
completely different multipoles can produce identical scattered fields. The
presented multipole theory can be used as a basis for the design and
characterization of optical nanomaterials
Electrically tunable GHz oscillations in doped GaAs-AlAs superlattices
Tunable oscillatory modes of electric-field domains in doped semiconductor
superlattices are reported. The experimental investigations demonstrate the
realization of tunable, GHz frequencies in GaAs-AlAs superlattices covering the
temperature region from 5 to 300 K. The orgin of the tunable oscillatory modes
is determined using an analytical and a numerical modeling of the dynamics of
domain formation. Three different oscillatory modes are found. Their presence
depends on the actual shape of the drift velocity curve, the doping density,
the boundary condition, and the length of the superlattice. For most bias
regions, the self-sustained oscillations are due to the formation, motion, and
recycling of the domain boundary inside the superlattice. For some biases, the
strengths of the low and high field domain change periodically in time with the
domain boundary being pinned within a few quantum wells. The dependency of the
frequency on the coupling leads to the prediction of a new type of tunable GHz
oscillator based on semiconductor superlattices.Comment: Tex file (20 pages) and 16 postscript figure
Characterising a Si(Li) detector element for the SIXA X-ray spectrometer
The detection efficiency and response function of a Si(Li) detector element
for the SIXA spectrometer have been determined in the 500 eV to 5 keV energy
range using synchrotron radiation emitted at a bending magnet of the electron
storage ring BESSY, which is a primary radiation standard. The agreement
between the measured spectrum and the model calculation is better than 2%.
PACS: 95.55.Ka; 07.85.Nc; 29.40.Wk; 85.30.De
Keywords: Si(Li) detectors, X-ray spectrometers, detector calibration, X-ray
response, spectral lineshapeComment: 11 pages, 11 PostScript figures, uses elsart.sty, submitted to Nucl.
Instrum. Meth.
Mucopolysaccharidosis VI in cats - clarification regarding genetic testing
Debate.
Published online: 02 July 2016.The release of new DNA-based diagnostic tools has increased tremendously in companion animals. Over 70 different DNA variants are now known for the cat, including DNA variants in disease-associated genes and genes causing aesthetically interesting traits. The impact genetic tests have on animal breeding and health management is significant because of the ability to control the breeding of domestic cats, especially breed cats. If used properly, genetic testing can prevent the production of diseased animals, causing the reduction of the frequency of the causal variant in the population, and, potentially, the eventual eradication of the disease. However, testing of some identified DNA variants may be unwarranted and cause undo strife within the cat breeding community and unnecessary reduction of gene pools and availability of breeding animals. Testing for mucopolysaccharidosis Type VI (MPS VI) in cats, specifically the genetic testing of the L476P (c.1427T>C) and the D520N (c.1558G>A) variants in arylsulfatase B (ARSB), has come under scrutiny. No health problems are associated with the D520N (c.1558G>A) variant, however, breeders that obtain positive results for this variant are speculating as to possible correlation with health concerns. Birman cats already have a markedly reduced gene pool and have a high frequency of the MPS VI D520N variant. Further reduction of the gene pool by eliminating cats that are heterozygous or homozygous for only the MPS VI D520N variant could lead to more inbreeding depression effects on the breed population. Herein is debated the genetic testing of the MPS VI D520N variant in cats. Surveys from different laboratories suggest the L476P (c.1427T>C) disease-associated variant should be monitored in the cat breed populations, particularly breeds with Siamese derivations and outcrosses. However, the D520N has no evidence of association with disease in cats and testing is not recommended in the absence of L476P genotyping. Selection against the D520N is not warranted in cat populations. More rigorous guidelines may be required to support the genetic testing of DNA variants in all animal species.Leslie A. Lyons, Robert A. Grahn, Francesca Genova, Michela Beccaglia, John J. Hopwood and Maria Longer
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