336 research outputs found
Inverse systems of spectra and generalizations of a theorem of W.H. Lin
No full textIn this thesis we generalize a theorem of W. H. Lin.
Lin's results are concerned with the homotopy and cohomotopy
of an inverse system of spectra {P-k }. Using the quadratic
construction we construct an inverse system of spectra {P-k(E)}
We generalize Lin's results by studying the homotopy and cohomotopy
of {P-k(E)}
Does the Correlation between 2MRS Galaxies and the CMB Indicate an Unmodeled CMB Foreground?
No full textWe revisit the claimed detection of a new cosmic microwave background (CMB) foreground based on the correlation between low-redshift 2MASS Redshift Survey (2MRS) galaxies and CMB temperature maps from the Planck and WMAP missions. We reproduce the reported measurements but argue that the original analysis significantly underestimated the uncertainties. We cross-correlate the 2MRS galaxy positions with simulated CMB maps and show that the correlation measured with the real data for late-type spiral galaxies at angular scales and redshift km s is consistent with zero at the level or less, depending on the exact CMB map and simulation construction. This was the sample that formed the basis for the original detection claim. For smaller angular separations the results are not robust to galaxy type or CMB cleaning method, and we are unable to draw firm conclusions. The original analysis did not propose a specific, falsifiable physical correlation mechanism, and it is impossible to rule out any contribution from an underlying physical effect. However, given our calculations, the lack of signal from expanding the redshift range, and the lack of corroboration from other galaxy surveys, we do not find the evidence for a new CMB foreground signal compelling.7 pages, 3 figures, accepted for publication by ApJ, code to reproduce calculations available at https://zenodo.org/records/1148918
Does the Correlation between 2MRS Galaxies and the CMB Indicate an Unmodeled CMB Foreground?
No full textWe revisit the claimed detection of a new cosmic microwave background (CMB) foreground based on the correlation between low-redshift Two Micron All Sky Survey Redshift Survey (2MRS) galaxies and CMB temperature maps from the Planck and Wilkinson Microwave Anisotropy Probe missions. We reproduce the reported measurements but argue that the original analysis significantly underestimated the uncertainties. We cross-correlate the 2MRS galaxy positions with simulated CMB maps and show that the correlation measured with the real data for late-type spiral galaxies at angular scales θ ≥ 0.°1 and redshift cz < 4500 km s ^−1 is consistent with zero at the 1.7 σ level or less, depending on the exact CMB map and simulation construction. This was the sample that formed the basis for the original detection claim. For smaller angular separations the results are not robust to galaxy type or CMB cleaning method, and we are unable to draw firm conclusions. The original analysis did not propose a specific, falsifiable physical correlation mechanism, and it is impossible to rule out any contribution from an underlying physical effect. However, given our calculations, the lack of signal from expanding the redshift range, and the lack of corroboration from other galaxy surveys, we do not find the evidence for a new CMB foreground signal compelling
The jingling Geordie: community arts and the regional culture of the North East of England
No full textIn the light of the massive economic and social changes which have affected the North East of England over the last 25 years, the author assesses the vitality of the indigenous culture and reflects upon current cultural trends and the North East’s future, particularly in relation to a regional Europe. He traces the folk-tradition of the region and looks at ways in which this can be drawn upon to develop a meaningful link between past and present. He looks closely at the changing nature of class-relationships in the North East and reflects upon how a valid local culture can survive in a multi-cultural society. He draws upon his own extensive experience in Community Arts, looking at definitions of the term in the new political climate and arguing for its positive contribution to the cultural debate. He dwells on the issue of regionalism and devolution in a new Europe, comparing the situation in the North East of England with political and cultural changes in Scotland and other parts of the United Kingdom
Organisation to decoration
No full textInteriors is a slippery discipline. Among all designed artefacts, interiors themselves are uniquely ephemeral and hard to define. The practice of interiors is relatively unregulated. The history of interiors is patchy and contested. The theoretical basis of interiors is largely unexplored in comparison to those of other disciplines. How, therefore, might we speculate about the role, validity and purpose of interiors in the 21st century?
Thinking inside the box is a reader designed to help students, academics, thinkers and practitioners of interiors do just that. Thinking inside the box is a collection of essays by prominent thinkers in the field of interiors, from Mark Taylor, co-author of ‘Intimus’ to Shashi Caan, the practitioner, and former head of interiors at Parsons, the new School of Design in New York. They address themes ranging from cushions, curtains, and feminism to the relationship between the interior and the enclave in the contemporary age of terror; from the regulation of the profession of interiors to the representation of the interior on the page, and in history.
This diverse reader is simply and clearly organised into four main sections:
• What is interior design? – debates on the identity, the profession, and the regulation of interior design
• Why do we do interior design? – essays on the relationship between theory and practice in interiors
• Histories of interior design – stories from the practice of interiors and meditations on the history of the discipline
• How do we teach interior design? – case studies from, and reflections upon, the education of the interior designer.
Thinking inside the box has been commissioned and edited by the Interiors Forum Scotland, a grouping of interior design academics from the University of Dundee, Edinburgh College of Art, Glasgow Metropolitan University, the Glasgow School of Art, and Napier University, Edinburgh, and The Lighthouse, Scotland’s Centre for Architecture, Design, and the City
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
No full textCMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. Among the science cases pursued with CMB-S4, the quest for detecting primordial gravitational waves is a central driver of the experimental design. This work details the development of a forecasting framework that includes a power-spectrum-based semianalytic projection tool, targeted explicitly toward optimizing constraints on the tensor-to-scalar ratio, r, in the presence of Galactic foregrounds and gravitational lensing of the CMB. This framework is unique in its direct use of information from the achieved performance of current Stage 2–3 CMB experiments to robustly forecast the science reach of upcoming CMB-polarization endeavors. The methodology allows for rapid iteration over experimental configurations and offers a flexible way to optimize the design of future experiments, given a desired scientific goal. To form a closed-loop process, we couple this semianalytic tool with map-based validation studies, which allow for the injection of additional complexity and verification of our forecasts with several independent analysis methods. We document multiple rounds of forecasts for CMB-S4 using this process and the resulting establishment of the current reference design of the primordial gravitational-wave component of the Stage-4 experiment, optimized to achieve our science goals of detecting primordial gravitational waves for r > 0.003 at greater than 5σ, or in the absence of a detection, of reaching an upper limit of r < 0.001 at 95% CL
An approach to situation recognition based on learned semantic models
No full textA key enabler of pervasive computing is the ability to drive service delivery through the analysis of situations: Semantically meaningful classifications of system state, identified through analysing the readings from sensors attached to the everyday objects that people interact with.
Situation recognition is a mature area of research, with techniques primarily falling into two categories. Knowledge-based techniques use inference rules crafted by experts; however often they compensate poorly for sensing peculiarities. Learning-based approaches excel at extracting patterns from noisy training data, however their lack of transparency can make it difficult to diagnose errors.
In this thesis we propose a novel hybrid approach to situation recognition that combines both techniques. This offers improvements over each used individually, through not sacrificing the intelligibility of the decision processes that the use of machine learning alone often implies, and through providing better recognition accuracy through robustness to noise typically unattainable when developers use knowledge-based techniques in isolation.
We present an ontology model and reasoning framework that supports the uniform modelling of pervasive environments, and infers additional knowledge from that which is specified, in a principled way. We use this as a basis from which to learn situation recognition models that exhibit comparable performance with more complex machine learning techniques, while retaining intelligibility. Finally, we extend the approach to construct ensemble classifiers with either improved recognition accuracy, intelligibility or both.
To validate our approach, we apply the techniques to real-world data sets collected in smart-office and smart-home environments. We analyse the situation recognition performance and intelligibility of the decision processes, and compare the results to standard machine learning techniques and results published in the literature
Neobuthus awashensis Kovarik et Lowe 2012
No full textNeobuthus awashensis Kovařík et Lowe, 2012 (Figs. 1–6, 158, 161–165) Neobuthus awashensis Kovařík & Lowe, 2012: 7–16, figs. 5–6, 18–21, 34–38, 44–47, 67–74, 86, 89, 92, 95–96, 100–101; Kovařík et al., 2015: 30. TYPE LOCALITY AND TYPE REPOSITORY. Ethiopia, Awash, Metahara env., 08°54' N 39°54' E, 960-1050 m a.s.l., FKCP. TYPE MATERIAL. Ethiopia, Awash, Metahara env., 08°54' N 39°54' E, 960-1050 m a.s.l., 1♀ (paratype), 2008, leg. V. Trailin, 2♀1♀ im. (allotype and paratypes), XI.2010, leg. T. Mazuch and P. Novák, 32♂ (holotype and paratypes) 18♀ (paratypes) 11♀ ims, 5♂ ims (paratypes), 19.-22.VII.2011, leg. F. Kovařík. Most types are in the collection of the second author (FKCP), two paratypes (♂ ♀) are in the collection of the first author (GL). OTHER MATERIAL EXAMINED. Ethiopia, 11°43'22" N 40° 56'52" E, 457 m a.s.l. (Locality No. 12 EMA), 20.XI. 2012, 1♀1♀ im., leg. F. Kovařík (UV detection), FKCP; 11°43'30" N 40°58'45" E, 404 m a.s.l. (Locality No. 12EM), 20.XI.2012, 1♂, leg. F. Kovařík (UV detection), FKCP; Gewane, 10°09'38" N 40°39'45" E, 631 m a.s.l. (Locality No. 12 EO), 23.XI.2012, 1♂ 1♀, leg. F. Kovařík, (UV detection), FKCP; 09°08'10.4" N 40°09' 45.5" E, 835 m a.s.l. (Locality No. 12ER), 24.XI.2012, 12♂ 1♀ 1juv., leg. F. Kovařík (UV detection), FKCP, 26.-27.XI.2014, 8♂ 2♀ 2juvs, FKCP, 3♂ 2juvs, GL, leg. F. Kovařík; Awash, Metahara env., 08°54' N 39°54' E, 960-1050 m a.s.l. (Locality No. 12 EX), 25.XI.2012, 7♂ 6♀ 5juvs., 27.-30.XI.2014, 7♂ 1♀, topotypes, leg. F. Kovařík (UV detection), FKCP. EMENDED DIAGNOSIS. Total length 18–22 mm (males), 22.5–30 mm (females); carapace with area between anterior median carinae fuscous; tergites with fuscous pigmentation unbroken across median area; pedipalp relatively slender, males with femur L/ W 2.50 –2.70, patella L/ W 2.45 –2.70, chela L/ W 4.63 –5.08; chela movable finger with 5–6 subrows of primary denticles, 3–5 external accessory denticles flanking proximal end of each subrow; trichobothria d 2 usually absent from femur and patella; posterior margins of carapace and tergites usually bearing 2–4 macrosetae; pedipalps, legs, metasoma and telson with short, stout macrosetae in males, and long, fine setae in females; males with coxae sparsely granulated, sternites III–VI lightly shagreened to smooth, sternite VII finely granulated with 4 weak, granulated carinae; females with sternites III–VI smooth, sternite VII sparsely shagreened with 4 weak carinae, median carinae granulated; metasoma I–III with median lateral carinae present in both sexes; lateral surface of metasoma V in males densely granulated, with granules separated; soles of telotarsi with relatively sparse setation, leg III of adults with 6–9 macrosetae in retroinferior series of basitarsus, 12–19 ventral macrosetae on telotarsus; pectine teeth: 17–21 (males), 15–18 (females).Published as part of Lowe, Graeme & Kovařík, František, 2016, Scorpions of the Horn of Africa (Arachnida, Scorpiones). Part V. Two new species of Neobuthus Hirst, 1911 (Buthidae), from Ethiopia and Eritrea, pp. 1-46 in Euscorpius 224 on page
Functionalised tetraheterofulvalenes for conducting landmuir-blodgett films and charge-transfer complexes
No full textThe tetrathiafulvalene (TTF) mono-anion route to functionalised derivatives has been extended to lead to new materials for charge-transfer (CT) complexes. New improved routes have been established towards halogenated and chalcogenated TTF derivatives from the TTF anion (23). Highly conducting complexes with TCNQ (1) have been obtained from 4-chloro- (30) and 4-bromotetrathiafulvalene (32). X-Ray studies of ethylenediseleno-TTF (44) and bis(tetrathiafulvalenyl)sulphide (59) have revealed novel structural features. New long chain TTF materials have also been synthesised, suitable for Langmuir-Blodgett (LB) films, using TTF anion and 1,3-dithiole cross-coupling methodologies. Amphiphiles bearing highly functionalised groups, both adjacent to the TTF ring and in the side chain, have been synthesised, and LB films have been formed from some of these materials. Iodine doping of the films has provided conducting mixed- valence systems. Monofunctionalised tetraselenafulvalenes (TSF) have been synthesised from the TSF tetra-anion (118) and a range of acid chlorides, to yield the corresponding ketones. X-Ray crystal structure analysis of 4-acetyltetraselenafulvalene (123), has unequivocally proven that under these reaction conditions the TSF unit stays intact
Parton distributions
No full textParton distributions, α(χ,μ(^₂) are essential ingredients for almost all theoretical calculations at hadron colliders. They give the number densities of the colliding par- tons (quarks and gluons) inside their parent hadrons at a given momentum fraction χand scale μ(^₂). The scale dependence of the parton distributions is given by DGLAP evolution, while the X dependence must be determined from a global analysis of deep-inelastic scattering (DIS) and related hard-scattering data. In Part I we introduce ‘doubly-unintegrateď parton distributions, fa(x, z, k(^₂),μ(^₂)), which additionally depend on the splitting fraction z and the transverse momentum (k) associated with the last evolution step. We show how these distributions can be used to calculate cross sections for inclusive jet production in DIS and compare the predictions to data taken at the HERA ep collider. We then calculate the transverse momentum distributions of พ and z bosons at the Tevatron pp collider and of Standard Model Higgs bosons at the forthcoming LHC. In Part II we study diffractive DIS, which is characterised by a large rapidity gap between the slightly deflected proton and the products of the virtual photon dissociation. We perform a novel QCD analysis of recent HERA data and extract diffractive parton distributions. The results of this analysis are used to investigate the effect of absorptive corrections in inclusive DIS. These absorptive corrections are due to the recombination of partons within the proton and are found to enhance the size of the gluon distribution at small X. We discuss the problem that the gluon distribution decreases with decreasing X at low scales while the sea quark distribution increases with decreasing X, whereas Regge theory predicts that both should have the same small-X behaviour. Our study hints at the possible importance of power corrections at low scales of around 1 GeV
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