نتایج جستجو برای: hoffman phantom

تعداد نتایج: 19689  

2016
Gail B. Murrow Richard Murrow

Here, we respond to three peer commentaries on our paper, ‘A hypothetical neurological association between dehumanization and human rights abuses’.1 In that paper, we hypothesized that dehumanizing implicit biases dampen the response of neuralmechanisms of pain empathy to (and thereby reduce empathy for) implicitly subordinated or dehumanized targets, perhaps offering some insight into the asso...

Journal: :Journal of Chemical Education 1996

Journal: :Journal of Dr. NTR University of Health Sciences 2013

Journal: :Physical review 2022

As was suggested twenty years ago, double-vortex condensation can drive a superconductor into fractionalized insulator with \ensuremath{\mathbb{Z}}${}_{2}$ topological order. With the advent of symmetry-protected phases, authors explore here effect strong correlation in weak superconductor, showing that gives rise to translation symmetry-enriched This $t\phantom{\rule{0}{0ex}}o\phantom{\rule{0}...

Journal: :Proceedings of the American Mathematical Society 1972

2007
Merisaari Harri Teras Mika Hirvonen Jussi Olli S. Nevalainen Hietala Jarmo

Quantitative accuracy of positron emission tomography (PET) is decreased by the partial volume effect (PVE). The PVE correction (PVC) methods proposed by Alfano et al., Rousset et al., Müller-Gärtner et al. and Meltzer et al. were evaluated in the present study to obtain guidelines for selecting among them. For accuracy evaluation, the Hoffman brain phantom was scanned with three PETs of differ...

Journal: :Computer methods and programs in biomedicine 2005
Jouni M. Mykkänen Jussi Tohka Jouni Luoma Ulla Ruotsalainen

In this study, we propose and evaluate new methods for automatic extraction of the brain surface and the mid-sagittal plane from functional positron emission tomography (PET) images. Designing methods for these segmentation tasks is challenging because the spatial distribution of intensity values in a PET image depends on the applied radiopharmaceutical and the contrast to noise ratio in a PET ...

Journal: :Physical review fluids 2021

A data-driven wall model for turbulent flows over periodic hills is developed using a feedforward neural network and wall-resolved large-eddy simulation data. The employs wall-normal distance, near-wall velocities, pressure gradients as input features, the shear stresses output labels, respectively. In $a$ $p\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{...

Journal: :Electr. J. Comb. 2004
Paul R. Hafner

We propose a new elementary definition of the Higman-Sims graph in which the 100 vertices are parametrised with Z4 × Z5 × Z5 and adjacencies are described by linear and quadratic equations. This definition extends Robertson’s pentagonpentagram definition of the Hoffman-Singleton graph and is obtained by studying maximum cocliques of the Hoffman-Singleton graph in Robertson’s parametrisation. Th...

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