2,885 research outputs found
Palaeolithic radiocarbon chronology: quantifying our confidence beyond two half-lives
No full textIt is now three decades since Waterbolk introduced evaluation criteria to 14C chronology. Despite this, and other subsequent attempts to introduce quality control in the use of 14C data, no systematic procedure has been adopted by the archaeological community. As a result, our databases may be significantly weakened by questionable dates and/or questionable associations between dated samples and the archaeological phenomena they are intended to represent. As the use of chronometric data in general becomes more ambitious, we must pause and assess how reliable these data are. Here, we forward a set of evaluation criteria which take into account archaeological (e.g. associational, stratigraphic) and chronometric (e.g. pre-treatment and measurement) criteria. We intend to use such criteria to evaluate a large 14C dataset we have assembled to investigate Late Glacial settlement in Europe, the Near East and North Africa, supported by the Leverhulme Trust. We suggest that the procedure presented here may at least form the basis of the development of more rigorous, scientific use of 14C dates
Letter dated 20 May 1980 from "Lois and M.B." to Zella and Lorenzo Richards
No full textLetter dated 20 May 1980 from "Lois and M.B." to Zella and Lorenzo Richard
PIDR(s): IDR(s) as a Projection Method
No full textThe Induced Dimension Reduction(s) method (or the IDR(s) method) is an example of an iterative method used for solving systems of linear equations. Projection methods are a special type of iterative method. They find an approximate solution in a subspace (the right subspace) by requiring that the residual is orthogonal to another subspace (the left subspace). In this thesis we investigate how we can implement IDR(s) as a projection method. We call this method IDR(s), which stands for Projected IDR(s).We present an implementation of PIDR(s) for solving systems of linear equations and for solving eigenvalue problems. These implementations are not meant to be optimal, but they are used to show that IDR(s) can indeed be seen as a projection method.Track: educationScience Education and CommunicationApplied Science
Author Correction:A 41,500 year-old decorated ivory pendant from Stajnia Cave (Poland)
No full textCorrection to: Scientific Reports https://doi.org/10.1038/s41598-021-01221-6, published online 25 November 2021The original version of this Article contained errors in the author list where Marjolein D. Bosch was omitted from the author list, and Mikołaj Urbanowski was incorrectly listed as an author of the original Article, and has subsequently been removed.The Author contributions section now reads:“S.T. W.N. and A.N. conceived the project; S.T., W.N., A.P., M.B., S.C., M.D., H.F., A.M., M.D. B., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H., performed research; S.T., A.P., W.N., M.B., M.D.B., S.C., M.D., H.F., A.M., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H. analysed all archaeological data; S.T. and A.P. wrote the paper with the collaboration of all the co-authors.”The original Article and its accompanying Supplementary Information file have been corrected
Actie podium van de stad - De plek voor overlapping van publieke en private actie; onderzoeksrapport. Het grote huis en de kleine stad - de stad van ankers in plaats van wortels; essay, onderdeel van onderzoeksrapport.
No full textHet onderzoeksrapport is in samenwerking van bovengenoemde auteurs tot stand gekomen. Het essay is enkel geschreven door M.B. Dekker.At home in the city - BerlinDwellingArchitectur
SUPEROPT: Problem Definition and Literature Review:D1
No full textThis report summarises the output of WP1: Detailed Problem Definition of the SESAR SUPEROPT project. A pair of challenge scenarios is defined and the proposed optimizers described. The set of scenarios are expanded to define the concepts to be studied in future work; these are described in terms of the proposed interactions between the supervisor and the optimisation.A 3-D performance model is incorporated into a MILP collision avoidance algorithm based on the EUROCONTROL Base of Aircraft Data (BADA). Initial results for constraining the sense of conflict resolution are presented using four separate formulations: one for 2-D and three for 3-D conflict avoidance
Current and future photovoltaics
No full textPhotovoltaics, now a billion-dollar industry, is experiencing staggering growth as increased concerns over fuel supply and carbon emissions have encouraged governments and environmentalists to become increasingly prepared to offset the extra cost of solar energy. Three 'generations' of photovoltaics have been envisaged that will take solar power into the mainstream. Photovoltaic production is currently 90% 'first-generation' or '1G' solar cells that rely on expensive bulk multi-crystalline or single-crystal semiconductors. Dominated by silicon wafers, they are reliable and durable but expensive. Half of the cost of 1G devices is the silicon wafer and efficiencies are limited to around 20%. Instead of using wafers, cheaper 'second-generation' (2G) solar cells would use cheap semiconductor thin-films deposited on low-cost substrates to produce devices of similar efficiencies. A number of thin-film device technologies account for around 5–6% of the market. As 2G technology reduces the active material cost, eventually the substrate will be the cost limit, and higher efficiency will be needed to maintain the $/W cost-reduction trend. 'Third-generation' devices (3G) will utilise new technologies to produce high-efficiency devices. Recently, tremendous advances outside the photovoltaic industry in nanotechnologies, photonics, optical metamaterials, plasmonics and semiconducting polymer sciences offer the prospect of cost-competitive photovoltaics based on new science and 3G concepts. Within the next 20 years, it is reasonable to expect that cost reductions, a move to 2G technologies and the implementation of some new technologies and 3G concepts can lead to fully cost-competitive solar energy
An eulogy on George Washington, late commander in chief of the armies of the United States of America, [electronic resource] : who died December 14, 1799. Delivered before the inhabitants of the town of Boston, at the request of their committee. By George Richards Minot, A.M. A.A.S.
No full textDelivered January 9, 1800.Half-title: Judge Minot's eulogy.Signatures: [A]p4s B-Cp4sEvans,Stillwell, M.B. Washington eulogies,Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Internet and e-health Care: an Interdigital Field of Study
No full textThe foreword focuses on a historical definition of the e-health field. The author contributed to shaping the e-health field in the international community being one of the pioneers' scholars since the 1990s. The chapter discusses current and challenging future scenarios based on the international evolution that brings about new challenges
Quality counts: Critical features for neophyte professional development
No full textThe aim of the study was to examine and reflect on the learning experiences of a neophyte sport psychologist. Over a 9-week applied internship the first author kept a reflective diary that followed Boud’s (2001) three elements of journal writing. Interpretative Phenomenological Analysis (Smith & Osborn, 2003) of the data identified 11 themes from the diary, 8 of which were contextualized in 3 self-narrative accounts, including the working environment, anxiety, confidence, being a performer, being a learner, relationships, feedback and practical content. Reflecting on these incidents the neophyte’s supervisor offers another perspective, and along with the narrative accounts, furthers our understanding of important factors, and indicates recommendations to ensure quality training for professional development
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