75,678 research outputs found
A local-global theorem for p-adic supercongruences
No full textLet Z(p) denote the ring of all p-adic integers and callu = {(x(1), ..., x(n)) : a(1)x(1) + ... + a(n)x(n) + b = 0}a hyperplane over Z(p)(n), where at least one of a(1), ...,an is not divisible by p. We prove that if a sufficiently regular n-variable function is zero modulo p(r) over some suitable collection of r hyperplanes, then it is zero modulo p(r) over the whole Z(p)(n). We provide various applications of this general criterion by establishing several p-adic analogues of hypergeometric identities. For example, we confirm a conjecture of Deines et al. as follows:Sigma(k=0)(5)(p-1)2/4)k)/(k!)(5) = -Gamma(p) (1/5)(5) Gamma(p) (2/5)(5) (mod p(5))for each p = 1 (mod 5), where (x)(k) = x(x + 1) ... (x + k - 1) and Gamma(p) denotes the p-adic Gamma function
The pan-European mobile radio system: Part I
No full textFollowing the launch of the Pan-European digital mobile radio (GSM) system its salient features are summarised in this tutorial review [I, 8]. Time Division Multiple Access (TDMA) with eight users per carrier is used at a multi-user rate of 27.1 kbit/s, demanding a channel equaliser to combat dispersion. The error protected chip-rate of the full-rate traffic channels is 22.8 kbit/s, while in half-rate channels is 11.4 kbit/s. There are two speech traffic channels, five different-rate data traffic channels and 14 various control and signalling channels to support the system's operation. A moderately complex, 13 kbit/s Regular Pulse Excited speech codec with long term predictor (LTP) is used, combined with an embedded three-class error correction codec and multi-layer interleaving to provide sensitivity-matched unequal error protection for the speech bits. An overall speech delay of 57.5 ms is maintained. Slow frequency hopping at 217 hops/s yields substantial performance gains for slowly moving pedestrians
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Review of the book Unbegrenzte moglichkeiten: Amerikanisierung in Deutschland und Frankreich (1900-1933) by Egbert Klautke
No full textDr. Jeff R. Schutts (Douglas College) reviews the book Unbegrenzte Moglichkeiten: Amerikanisierung in Deutschland und Frankreich (1900-1933) by Egbert Klautke (2005).Final article published
Magnetostratigraphic age of the Xiantai Paleolithic site in the Nihewan Basin and implications for early human colonization of Northeast Asia
No full textTiming of the early habitation and stone technologies in the Nihewan Basin, North China has provided insights into our understanding of early human adaptability to high northern latitudes in East Asia. Here we contribute to this topic with detailed magnetostratigraphic investigation, coupled with mineral magnetic measurements and palynological analyses on a lacustrine sequence in this basin, which contains the Xiantai Paleolithic site. Magnetite and hematite were identified as the main carriers for the characteristic remanent magnetizations. Magnetostratigraphic results show that the Xiantai lacustrine sequence recorded the Brunhes chron, the Jaramillo and the Olduvai subchrons, and successive reverse polarity portions of the intervening Matuyama chron. Stratigraphic correlation in terms of lithology, magnetic susceptibility and magnetic polarity sequences between the Xiantai and Xiaochangliang sections indicates that the Xiantai artefact layer is readily contemporary with the Xiaochangliang artefact layer, which has been previously estimated to be about 1.36 Ma [R.X. Zhu, K.A. Hoffman, R. Potts, C.L. Deng, Y.X. Pan, B. Guo, C.D. Shi, Z.T. Guo, B.Y. Yuan, Y.M. Hou, W.W. Huang, Earliest presence of humans in northeast Asia, Nature 413 (2001) 413–417.]. Early humans of the Xiantai Paleolithic site lived in a steppe paleoenvironment indicated from fossil pollens. Furthermore, the combined evidence of our magnetostratigraphy and previously published magnetochronology and paleoclimate data documents that early humans of North China were able to adjust to an increasing variability of paleoclimates and paleoenvironments over the Early Pleistocene
Compressive Sensing for PAN-Sharpening
No full textBased on compressive sensing framework and sparse reconstruction technology, a new pan-sharpening method, named Sparse Fusion of Images (SparseFI, pronounced as sparsify), is proposed in [1]. In this paper, the proposed SparseFI algorithm is validated using UltraCam and WorldView-2 data. Visual and statistic analysis show superior performance of SparseFI compared to the existing conventional pan-sharpening methods in general, i.e. rich in spatial information and less spectral distortion. Moreover, popular quality assessment metrics are employed to explore the dependency on regularization parameters and evaluate the efficiency of various sparse reconstruction toolboxes
Letter from R. H. Ford to Commissioner of Indian Affairs, 1860
No full textR. H. Ford (letter author) is the brother of Henry L. Ford. The letter asks if the recently deceased Henry L. Ford was due anything from the government, which would be left to his father, William Ford
Papers of R H Horne
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/69212R.H. "Orion" Horne: Syllabus of Three Lectures on the Undeveloped Characters in Shakespeare's Plays by R.H. Horne, author of "Orion", "Cosmo de Medici" and "Death of Marlowe", etc. Leaflet showing contents of each of the three lectures. On verso, a note by Horne explaining that these lectures had been given at the Manchester Athenuem, the Literary and Scientific Institute, Marylebone, and at the Mechanics Institute, Liverpool. This leaflet is folded in with handwritten expositions (probably lectures): 1. The Bible, 31 pp. 2. Gems form Auriel (Henri Frederico Auriel, 1821-1881), 5 pp. 3. Some illustrations of Shakespeare's Art, 20 pp.113896
Acquisition: [1989.0151] "Papers of R H Horne
198 Reliable and interpretable segmentation for remote assessment of atopic dermatitis severity using digital images
No full textAssessing the severity of atopic dermatitis (AD) traditionally relies on a face-to-face assessment by healthcare professionals and may suffer from inter- and intra-rater variability. With the increasing demand for better patient self-care and the growing popularity of telemedicine post-pandemic, the ability to assess AD severity remotely from digital images, such as those taken with a smartphone camera, is becoming increasingly important. Previously, we developed EczemaNet, a fully automated computer vision pipeline for detecting and assessing AD severity. It demonstrated good performance for assessing AD severity in real-world images while being robust to suboptimal imaging conditions. However, we recognize that it had limitations in practical use due to its lack of interpretability in AD area segmentation and to the need for more reliable AD segmentation data provided by specialists. At the same time, we also found a poor agreement for AD segmentation in digital images, with the average interclass correlation coefficient among four dermatologists being 0.45 on 80 digital images. To address these challenges, we improved EczemaNet pipeline to perform AD segmentation in a more reliable and interpretable fashion. The new pipeline uses pixel-level segmentation and data augmentation to improve the quality and robustness of AD lesion detection. We achieved pixel-level AD segmentation using U-Net architecture and evaluated the reliability of the pipeline using various data augmentation methods such as Pix2Pix. Our investigation found that the use of whole-skin images for model training is a viable alternative as a data collection strategy, which would allow the data acquisition to be more cost-effective without affecting the system's final performance
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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