995 research outputs found
On the Existence of Small Strictly Neumaier Graphs
No full textA Neumaier graph is a non-complete edge-regular graph containing a regular clique. In this work, we prove several results on the existence of small strictly Neumaier graphs. In particular, we present a theoretical proof of the uniqueness of the smallest strictly Neumaier graph with parameters (16, 9, 4; 2, 4), we establish the existence of a strictly Neumaier graph with parameters (25, 12, 5; 2, 5), and we disprove the existence of strictly Neumaier graphs with parameters (25, 16, 9; 3, 5), (28, 18, 11; 4, 7), (33, 24, 17; 6, 9), (35, 2212; 3, 5), (40, 30, 22; 7, 10) and (55, 34, 18; 3, 5). Our proofs use combinatorial techniques and a novel application of integer programming methods.</p
Introduction to numerical analysis / Arnold Neumaier.
No full textIncludes bibliographical references (p. 345-349) and index.viii, 356 p.
Considerazioni sulle lacerazioni sottocutanee del tendine del quadricipite.
No full textThe Authors report a series of 7 patients operated for subcutaneous lesions of the quadriceps tendon using clinical, echotographic and isokinetic management
An Optimal Subgradient Algorithm with Subspace Search for Costly Convex Optimization Problems
No full textThis paper presents an acceleration of the optimal subgradient algorithm OSGA (Neumaier in Math Program 158(1–2):1–21, 2016) for solving structured convex optimization problems, where the objective function involves costly affine and cheap nonlinear terms. We combine OSGA with a multidimensional subspace search technique, which leads to a low-dimensional auxiliary problem that can be solved efficiently. Numerical results concerning some applications are reported. A software package implementing the new method is available.© The Author(s) 201
Flicker noise in graphene-based Hall sensors
No full textWe present an investigation of shot noise in graphene-based Hall sensors, with the purpose of evaluating their detection limit and of developing strategies to improve their characteristics. We perform measurements on two devices, one with a defective contact that could however be used as a gate to control the carrier density in the device and the other with all contacts working. We discuss the results in terms of the dependence of the noise power spectral density on the carrier density and on the DC bias current. Finally, we provide an estimate of the detection limit, pointing out that the approach commonly used in the literature for its evaluation is flawed
Diffusion in diamond-like carbon
No full textThe diffusion of carbon and five other elements in amorphous carbon (a-C) films was studied. One set of samples were sp(2) dominated a-C and the other set of samples were sp(3) dominated tetrahedral amorphous carbon (ta-C). The films were deposited using mass separated ion beam deposition under UHV conditions. The diffusion of C-13 as well as that of hydrogen and deuterium was studied using high resolution elastic recoil detection analysis. No apparent self-diffusion could be detected using this technique. The diffusion of hydrogen was found to start at temperatures between 600 and 800 degreesC. For deuterium, activation energies of 3.34(5) and 3.39(5) eV were found for diffusion in ta-C and a-C, respectively. Tungsten, copper and silver were used to study the diffusion of metals in ta-C. Up to annealing temperatures of 1000 degreesC no diffusion took place in the samples. During annealing at 1200 degreesC the ta-C is converted into graphite, making diffusion into the carbon matrix possible. The fact that there is no diffusion of copper in ta-C at temperatures below 1200 degreesC shows that ta-C is a possible diffusion barrier between copper and silicon. (C) 2003 Elsevier Science B.V. All rights reserved
[Usefulness of perineal and transrectal echotomography in the preoperative evaluation and follow-up of primary and recurrent tumors of the rectum. Our experience].
No full textHigh-resolution elastic recoil detection utilizing Bayesian probability theory
No full textElastic recoil detection (ERD) analysis is improved in view of depth resolution and the reliability of the measured spectra. Good statistics at even low ion fluences is obtained utilizing a large solid angle of 5 msr at the Munich Q3D magnetic spectrograph and using a 40 MeV Au-197 beam. In this way the elemental depth profiles are not essentially altered during analysis even if distributions with area densities below 1 x 10(14) atoms/cm(2) are measured. As the energy spread due to the angular acceptance is fully eliminated by ion-optical and numerical corrections, an accurate and reliable apparatus function is derived. It allows to deconvolute the measured spectra using the adaptive kernel method, a maximum entropy concept in the framework of Bayesian probability theory. In addition, the uncertainty of the reconstructed spectra is quantified, The concepts are demonstrated at C-13 depth profiles measured at ultra-thin films of tetrahedral amorphous carbon (ta-C). Depth scales of those profiles are given with an accuracy of 1.4 x 10(15) atoms/ cm(2). (C) 2001 Elsevier Science B.V. All rights reserved
sj-docx-4-dhj-10.1177_20552076231211552 - Supplemental material for Triptychon: Usability evaluation and implementation of a web-based application for patients’ lab and vital parameters
No full textSupplemental material, sj-docx-4-dhj-10.1177_20552076231211552 for Triptychon: Usability evaluation and implementation of a web-based application for patients’ lab and vital parameters by Maximilian Kittel, Preetha Moorthy, Sonika Rao, Marie Halfmann, Margot Thiaucourt, Maximilian Strauß, Verena Haselmann, Nandhini Santhanam, Fabian Siegel and Michael Neumaier in DIGITAL HEALTH</p
sj-docx-3-dhj-10.1177_20552076231211552 - Supplemental material for Triptychon: Usability evaluation and implementation of a web-based application for patients’ lab and vital parameters
No full textSupplemental material, sj-docx-3-dhj-10.1177_20552076231211552 for Triptychon: Usability evaluation and implementation of a web-based application for patients’ lab and vital parameters by Maximilian Kittel, Preetha Moorthy, Sonika Rao, Marie Halfmann, Margot Thiaucourt, Maximilian Strauß, Verena Haselmann, Nandhini Santhanam, Fabian Siegel and Michael Neumaier in DIGITAL HEALTH</p
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