298 research outputs found
A nyelvjárások témakörének megjelenése nyelvtankönyveinkben
Jelen kutatás eredményei több ponton elgondolkodtatóak. Ugyan 101 tankönyv
és nyelvészeti tárgyú munka csoportosítás nélküli vizsgálata nem
adhat teljes képet arról, hogyan szerepel a témakör a magyar nyelvű tankönyvekben,
de mintaként a további kutatásokhoz kiindulópontként szolgálhat.
A vizsgálat tanulságos, hiszen mindezekből látható, hogy mennyire
nyújtanak (ha nyújtanak egyáltalán) támaszt tankönyveink a magyartanároknak
a tanításhoz, illetve a diákoknak a téma tanulásához. Sok tankönyv
témafeldolgozása több ponton nem logikus felépítés. Dialektológusok,
pedagógusok és tankönyvírók együttes munkájával viszont célt lehetne
érni
BeliefPPG: Uncertainty-aware Heart Rate Estimation from PPG signals via Belief Propagation
We present a novel learning-based method that achieves state-of-the-art
performance on several heart rate estimation benchmarks extracted from
photoplethysmography signals (PPG). We consider the evolution of the heart rate
in the context of a discrete-time stochastic process that we represent as a
hidden Markov model. We derive a distribution over possible heart rate values
for a given PPG signal window through a trained neural network. Using belief
propagation, we incorporate the statistical distribution of heart rate changes
to refine these estimates in a temporal context. From this, we obtain a
quantized probability distribution over the range of possible heart rate values
that captures a meaningful and well-calibrated estimate of the inherent
predictive uncertainty. We show the robustness of our method on eight public
datasets with three different cross-validation experiments.Comment: Conference on Uncertainty in Artificial Intelligence (UAI) 2023. The
first two authors contributed equall
EgoPoser: Robust Real-Time Ego-Body Pose Estimation in Large Scenes
Full-body ego-pose estimation from head and hand poses alone has become an
active area of research to power articulate avatar representation on
headset-based platforms. However, existing methods over-rely on the confines of
the motion-capture spaces in which datasets were recorded, while simultaneously
assuming continuous capture of joint motions and uniform body dimensions. In
this paper, we propose EgoPoser, which overcomes these limitations by 1)
rethinking the input representation for headset-based ego-pose estimation and
introducing a novel motion decomposition method that predicts full-body pose
independent of global positions, 2) robustly modeling body pose from
intermittent hand position and orientation tracking only when inside a
headset's field of view, and 3) generalizing across various body sizes for
different users. Our experiments show that EgoPoser outperforms
state-of-the-art methods both qualitatively and quantitatively, while
maintaining a high inference speed of over 600 fps. EgoPoser establishes a
robust baseline for future work, where full-body pose estimation needs no
longer rely on outside-in capture and can scale to large-scene environments
Effects of High Charge Densities in Multi-GEM Detectors
A comprehensive study, supported by systematic measurements and numerical
computations, of the intrinsic limits of multi-GEM detectors when exposed to
very high particle fluxes or operated at very large gains is presented. The
observed variations of the gain, of the ion back-flow, and of the pulse height
spectra are explained in terms of the effects of the spatial distribution of
positive ions and their movement throughout the amplification structure. The
intrinsic dynamic character of the processes involved imposes the use of a
non-standard simulation tool for the interpretation of the measurements.
Computations done with a Finite Element Analysis software reproduce the
observed behaviour of the detector. The impact of this detailed description of
the detector in extreme conditions is multiple: it clarifies some detector
behaviours already observed, it helps in defining intrinsic limits of the GEM
technology, and it suggests ways to extend them.Comment: 5 pages, 6 figures, 2015 IEEE Nuclear Science Symposiu
Intravenous calcitriol normalizes insulin sensitivity in uremic patients
Intravenous calcitriol normalizes insulin sensitivity in uremic patients. Recent studies suggest that secondary hyperparathyroidism and/or vitamin D deficiency are responsible for the insulin resistance in chronic renal failure. We investigated the effect of a 12-week intravenous treatment with 1,25 dihydroxycholecalciferol on glucose metabolism in 10 hemodialysis patients compared with 10 healthy control subjects by the frequently-sampled intravenous glucose tolerance test, analyzed with the minimal model technique. Compared to control subjects, the uremic patients featured elevated levels of parathyroid hormone (432 ± 60 vs. 41 ± 4 ng/liter, P < 0.001), insulin resistance (insulin sensitivity index, SI: 4.9 ± 0.8 vs. 9.5 ± 0.9 MIN-1/(µ/m1), P < 0.002), increased posthepatic insulin delivery (6.48 ± 2.48 vs. 2.73 ± 3.14 nmol/liter in 4 hr, P < 0.001) and a reduced C-peptide fractional clearance (0.033 ± 0.004 vs. 0.085 ± 0.009 min-1, P < 0.0002). Following treatment with 1,25 dihydroxycholecalciferol, the parathyroid hormone levels decreased significantly to 237 ± 30 ng/liter (P < 0.05), the insulin sensitivity index (SI: 9.6 ± 2.2, P < 0.05) reached a value similar to that of control subjects, and posthepatic insulin delivery decreased to 4.63 ± 0.83 nmol/liter in 4 hr (P < 0.01), while all the other parameters remained unchanged. In summary, uremic patients with secondary hyperparathyroidism were found to be severely insulin resistant and hyperinsulinemic. Intravenous vitamin D treatment led to a significant reduction of parathyroid hormone levels and to a complete normalization of insulin sensitivity in the hemodialysis patients. Thus, intravenous 1,25 dihydroxycholecalciferol improves insulin resistance in uremic patients, acting per se or by reducing secondary hyperparathyroidism
Charge Transfer Properties Through Graphene for Applications in Gaseous Detectors
Graphene is a single layer of carbon atoms arranged in a honeycomb lattice
with remarkable mechanical and electrical properties. Regarded as the thinnest
and narrowest conductive mesh, it has drastically different transmission
behaviours when bombarded with electrons and ions in vacuum. This property, if
confirmed in gas, may be a definitive solution for the ion back-flow problem in
gaseous detectors. In order to ascertain this aspect, graphene layers of
dimensions of about 2x2cm, grown on a copper substrate, are transferred
onto a flat metal surface with holes, so that the graphene layer is freely
suspended. The graphene and the support are installed into a gaseous detector
equipped with a triple Gaseous Electron Multiplier (GEM), and the transparency
properties to electrons and ions are studied in gas as a function of the
electric fields. The techniques to produce the graphene samples are described,
and we report on preliminary tests of graphene-coated GEMs.Comment: 4pages, 3figures, 13th Pisa Meeting on Advanced Detector
Wachstumsminderung
X-ray absorption near edge structure (XANES) analysis in combination with synchrotron radiation induced total reflection X-ray fluorescence (SR-TXRF) acquisition was used to determine the oxidation state of Fe in human cancer cells and simultaneously their elemental composition by applying a simple sample preparation procedure consisting of pipetting the cell suspension onto the quartz reflectors.
XANES spectra of several inorganic and organic iron compounds were recorded and compared to that of different cell lines. The XANES spectra of cells, independently from the phase of cell growth and cell type were very similar to that of ferritin, the main Fe store within the cell. The spectra obtained after CoCl2 or NiCl2 treatment, which could mimic a hypoxic state of cells, did not differ noticeably from that of the ferritin standard. After 5-fluorouracil administration, which could also induce an oxidative-stress in cells, the absorption edge position was shifted toward higher energies representing a higher oxidation state of Fe. Intense treatment with antimycin A, which inhibits electron transfer in the respiratory chain, resulted in minor changes in the spectrum, resembling rather the N-donor Fe-,′-dipyridyl complex at the oxidation energy of Fe(III), than ferritin. The incorporation of Co and Ni in the cells was followed by SR-TXRF measurements
temporary implementation and testing of a confocal sr μxrf system for bone analysis at the x ray fluorescence beamline at elettra
Abstract The confocal μ XRF spectrometer of Atominstitut (ATI) was transported and set up at the X-ray Fluorescence beamline at Elettra - Sincrotrone Trieste. It was successfully adjusted to the incoming beam (9.2 keV). Test measurements on a free-standing Cu wire were performed to determine the size of the focused micro-beam (non-confocal mode, 56 × 35 μ m 2 ) and the size of the confocal volume (confocal mode, 41 × 24 × 34 μ m 2 ) for the Cu–K α emission. In order to test the setup's capabilities, two areas on different human bone samples were measured in confocal scanning mode. For one of the samples the comparison with a previous μ XRF measurement, obtained with a low power X-ray tube in the lab, is presented
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