1,816 research outputs found
Hidden long-distance movements by a migratory bird
No full textCode and data files associated with Current Biology publication. Please contact lead author if you are interested in using for any reason
Hidden long-distance movements by a migratory bird
No full textCode and data files associated with Current Biology publication. Please contact lead author if you are interested in using data for any reason
Quasirandom arithmetic permutations
No full textAbstractIn [J.N. Cooper, Quasirandom permutations, 2002, to appear], the author introduced quasirandom permutations, permutations of Zn which map intervals to sets with low discrepancy. Here we show that several natural number-theoretic permutations are quasirandom, some very strongly so. Quasirandomness is established via discrete Fourier analysis and the Erdős–Turán inequality, as well as by other means. We apply our results on Sós permutations to make progress on a number of questions relating to the sequence of fractional parts of multiples of an irrational. Several intriguing open problems are presented throughout the discussion
Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires
No full textIn most naturally occurring superconductors, electrons with opposite spins
are paired up to form Cooper pairs. This includes both conventional -wave
superconductors such as aluminum as well as high-, -wave
superconductors. Materials with intrinsic -wave superconductivity, hosting
Cooper pairs made of equal-spin electrons, have not been conclusively
identified, nor synthesized, despite promising progress. Instead, engineered
platforms where -wave superconductors are brought into contact with magnetic
materials have shown convincing signatures of equal-spin pairing. Here, we
directly measure equal-spin pairing between spin-polarized quantum dots. This
pairing is proximity-induced from an -wave superconductor into a
semiconducting nanowire with strong spin-orbit interaction. We demonstrate such
pairing by showing that breaking a Cooper pair can result in two electrons with
equal spin polarization. Our results demonstrate controllable detection of
singlet and triplet pairing between the quantum dots. Achieving such triplet
pairing in a sequence of quantum dots will be required for realizing an
artificial Kitaev chain.Comment: Authors' version of the accepted manuscrip
The SF-36: a simple, effective measure of mobility disability for epidemiological studies
No full textBackgroundMobility disability is a major problem in older people. Numerous scales exist for the measurement of disability but often these do not permit comparisons between study groups. The physical functioning (PF) domain of the established and widely used Short Form-36 (SF-36) questionnaire asks about limitations on ten mobility activities.ObjectivesTo describe prevalence of mobility disability in an elderly population, investigate the validity of the SF-36 PF score as a measure of mobility disability, and to establish age and sex specific norms for the PF score.MethodsWe explored relationships between the SF-36 PF score and objectively measured physical performance variables among 349 men and 280 women, 59-72 years of age, who participated in the Hertfordshire Cohort Study (HCS). Normative data were derived from the Health Survey for England (HSE) 1996.Results32% of men and 46% of women had at least some limitation in PF scale items. Poor SF-36 PF scores (lowest fifth of the gender-specific distribution) were related to: lower grip strength; longer timed-up-and-go, 3m walk, and chair rises test times in men and women; and lower quadriceps peak torque in women but not men. HSE normative data showed that median PF scores declined with increasing age in men and women.ConclusionOur results are consistent with the SF-36 PF score being a valid measure of mobility disability in epidemiological studies. This approach might be a first step towards enabling simple comparisons of prevalence of mobility disability between different studies of older people. The SF-36 PF score could usefully complement existing detailed schemes for classification of disability and it now requires validation against them
Asking more of qualitative synthesis: a response to Sally Thorne
No full textThis is the author accepted manuscript. The final version is available from SAGE Publications via the DOI in this record.We continue the conversation initiated by Sally Thorne’s observations about ‘metasynthetic madness’. We note that the variety of labels used to describe qualitative syntheses often reflect authors’ disciplines and geographical locations. The purpose of systematic literature searching is to redress authors’ lack of citation of relevant earlier work and to reassure policy makers that qualitative syntheses are systematic and transparent. There is clearly a need to develop other methods of searching to supplement electronic searches. If searches produce large numbers of articles, sampling strategies may be needed to choose which articles to synthesize. The quality of any synthesis is dependent on the quality of the primary articles; both primary research and qualitative synthesis need to move beyond description and towards theory and explanation. Synthesizers need to pay attention to those articles which do not seem to fit their emerging analysis if they are to avoid stifling new ideas.Nicky Britten, Ruth Garside and Julia Frost were partially supported by the National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care South West Peninsula (PenCLAHRC). Catherine Pope is a member of NIHR Collaboration for Leadership in Applied Health Research and Care Wessex (CLAHRC Wessex). Chris Cooper is funded by an NIHR Health Technology Assessment Programme Grant
Assessment of available anatomical characters for linking living mammals to fossil taxa in phylogenetic analyses
No full textORCID: 0000-0003-4919-8655© 2016 The Authors.
Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. The file attached is the published version of the article.NHM Repositor
THE MOMENTS OF INERTIA TIE-UP WITH SEXUAL SIZE DIMORPHISM IN RED MILLIPEDES CENTROBOLUS COOK, 1897
No full textAbstract: Body size is a correlate of copulation duration in Centrobolus. I tested for the presence of a relationship between sexual size dimorphism (SSD) and moments of inertia in C. fulgidus (n=11), C. inscriptus (n=88, 56+41), and C. ruber (n=18). Male moments of inertia correlated significantly with SSD (r=-0.99, Z score=-2.62, n=4, p<0.01). Females' moments of inertia did not. Larger males were suspected to be more competitive.
Keywords: Arthropods, body size, Centrobolus, sexual dimorphism.
Title: THE MOMENTS OF INERTIA TIE-UP WITH SEXUAL SIZE DIMORPHISM IN RED MILLIPEDES CENTROBOLUS COOK, 1897
Author: M. Cooper
International Journal of Recent Research in Thesis and Dissertation (IJRRTD)
Vol. 3, Issue 1, January 2022 - June 2022
Page No: 127-129
Paper Publications
Website: www.paperpublications.org
Published Date: 17-June-2022
DOI: https://doi.org/10.5281/zenodo.6656536
Paper Download Link (Source)
https://www.paperpublications.org/upload/book/THE%20MOMENTS%20OF%20INERTIA-17062022-4.pdfInternational Journal of Recent Research in Thesis and Dissertation (IJRRTD), Paper Publications, Website: www.paperpublications.or
Hearing the grass grow. Emotional and epistemological challenges of practice-near research
No full textThis paper discusses the concept of practice-near research in terms of the emotional and epistemological challenges that arise from the researcher coming 'near' enough to other people for psychological processes to ensue. These may give rise in the researcher to confusion, anxiety and doubt about who is who and what is what; but also to the possibility of real emotional and relational depth in the research process. Using illustrations from three social work doctoral research projects undertaken by students at the Tavistock Clinic and the University of East London the paper examines four themes that seem to the author to be central to meaningful practice-near research undertaken in a spirit of true emotional and epistemological open-mindedness: the smell of the real; losing our minds; the inevitability of personal change; and the discovery of complex particulars
Do copulation durations of sympatric red millipedes vary seasonally with mating frequencies?
No full textAbstract: Mating frequencies and copulation duration were assessed in sympatric red millipedes of the genus Centrobolus across the ground and tree substrata early and late in a season. There was a correlation between male and female mating frequencies of C. anulatus and C. inscriptus and copulation durations (r=0.72, Z-score=2.02, n=8, p=0.02). There was a correlation between male and female mating frequencies and copulation durations recorded late (r=0.83, Z score=2.64, n=8, p<0.01), on the ground late (r=0.93, Z score=3.74, n=8, p<0.01), and in the trees late (r=0.89, Z score=3.13, n=8, p<0.01). This suggested copulation duration is seasonal when mating frequencies were controlled.
Keywords: duration; frequency; ratio, size; species.
Title: Do copulation durations of sympatric red millipedes vary seasonally with mating frequencies?
Author: Mark I. Cooper
International Journal of Recent Research in Thesis and Dissertation (IJRRTD)
Vol. 3, Issue 1, January 2022 - June 2022
Page No: 85-90
Paper Publications
Website: www.paperpublications.org
Published Date: 04-June-2022
DOI: https://doi.org/10.5281/zenodo.6613001
Paper download Link (Source)
https://www.paperpublications.org/upload/book/Do%20copulation%20durations-04062022-1.pdfInternational Journal of Recent Research in Thesis and Dissertation (IJRRTD), Paper Publications (Publisher), Website: www.paperpublications.or
- …
