3,996 research outputs found
Spatially Varying Steady State Longitudinal Magnetization in Distant Dipolar Field-based Sequences
Sequences based on the Distant Dipolar Field (DDF) have shown great promise
for novel spectroscopy and imaging. Unless spatial variation in the
longitudinal magnetization, M_{z}(s), is eliminated by relaxation, diffusion,
or spoiling techniques by the end of a single repetition, unexpected results
can be obtained due to spatial harmonics in the steady state M_{z}^{SS}(s)
profile. This is true even in a homogeneous single-component sample. We have
developed an analytical expression for the M_{z}^{SS}(s) profile that occurs in
DDF sequences when smearing by diffusion is negligible in the TR period. The
expression has been verified by directly imaging the M_{z}^{SS}(s) profile
after establishing the steady state. more keywords: magnetic resonance,
intermolecular multiple quantum coherence, mesoscale structure, iMQC, DDFComment: 7 pages, 4 figures, submitted to Journal of Magnetic Resonanc
Generating Adversarial Examples with Adversarial Networks
Deep neural networks (DNNs) have been found to be vulnerable to adversarial
examples resulting from adding small-magnitude perturbations to inputs. Such
adversarial examples can mislead DNNs to produce adversary-selected results.
Different attack strategies have been proposed to generate adversarial
examples, but how to produce them with high perceptual quality and more
efficiently requires more research efforts. In this paper, we propose AdvGAN to
generate adversarial examples with generative adversarial networks (GANs),
which can learn and approximate the distribution of original instances. For
AdvGAN, once the generator is trained, it can generate adversarial
perturbations efficiently for any instance, so as to potentially accelerate
adversarial training as defenses. We apply AdvGAN in both semi-whitebox and
black-box attack settings. In semi-whitebox attacks, there is no need to access
the original target model after the generator is trained, in contrast to
traditional white-box attacks. In black-box attacks, we dynamically train a
distilled model for the black-box model and optimize the generator accordingly.
Adversarial examples generated by AdvGAN on different target models have high
attack success rate under state-of-the-art defenses compared to other attacks.
Our attack has placed the first with 92.76% accuracy on a public MNIST
black-box attack challenge.Comment: Accepted to IJCAI201
Unaided stereo vision based pose estimation
This paper presents the development of a low-cost sensor platform for use in ground-based visual pose estimation and scene mapping tasks. We seek to develop a technical solution using low-cost vision hardware that allows us to accurately estimate robot position for SLAM tasks. We present results from the application of a vision based pose estimation technique to simultaneously determine camera poses and scene structure. The results are generated from a dataset gathered traversing a local road at the St Lucia Campus of the University of Queensland. We show the accuracy of the pose estimation over a 1.6km trajectory in relation to GPS ground truth
Does Adding Pictures to Glosses Enhance Vocabulary Uptake from Reading?
This article reports three trials of a pen-and-paper experiment where adult L2 learners’ recollection of glossed words was tested after they had read a text with or without pictures included in the glosses. Unlike previous studies in which a superiority of multimodal glosses over text-only glosses was claimed, the experiment furnished no evidence that the addition of pictures helped the learners to retain the glossed words’ form-meaning association any better than providing glosses containing only verbal explanations. When learners were prompted to recall of the written form of the words, the gloss condition without pictures in fact led to the better performance. The results suggest that the provision of pictures alongside textual information to elucidate the meaning of novel words may reduce the amount of attention that L2 readers give to the form of these words
Impacts of climate change on TN load and its control in a River Basin with complex pollution sources
It is increasingly recognized that climate change could affect the quality of water through complex natural and anthropogenic mechanisms. Previous studies on climate change and water quality have mostly focused on assessing its impact on pollutant loads from agricultural runoff. A sub-daily SWAT model was developed to simulate the discharge, transport, and transformation of nitrogen from all known anthropogenic sources including industries, municipal sewage treatment plants, concentrated and scattered feedlot operations, rural households, and crop production in the Upper Huai River Basin. This is a highly polluted basin with total nitrogen (TN) concentrations frequently exceeding Class V of the Chinese Surface Water Quality Standard (GB3838-2002). Climate change projections produced by 16 Global Circulation Models (GCMs) under the RCP 4.5 and RCP 8.5 scenarios in the mid (2040–2060) and late (2070–2090) century were used to drive the SWAT model to evaluate the impacts of climate change on both the TN loads and the effectiveness of three water pollution control measures (reducing fertilizer use, constructing vegetative filter strips, and improving septic tank performance) in the basin. SWAT simulation results have indicated that climate change is likely to cause an increase in both monthly average and extreme TN loads in February, May, and November. The projected impact of climate change on TN loads in August is more varied between GCMs. In addition, climate change is projected to have a negative impact on the effectiveness of septic tanks in reducing TN loads, while its impacts on the other two measures are more uncertain. Despite the uncertainty, reducing fertilizer use remains the most effective measure for reducing TN loads under different climate change scenarios. Meanwhile, improving septic tank performance is relatively more effective in reducing annual TN loads, while constructing vegetative filter strips is more effective in reducing annual maximum monthly TN loads
A first-principles study of oxygen vacancy pinning of domain walls in PbTiO3
We have investigated the interaction of oxygen vacancies and 180-degree
domain walls in tetragonal PbTiO3 using density-functional theory. Our
calculations indicate that the vacancies do have a lower formation energy in
the domain wall than in the bulk, thereby confirming the tendency of these
defects to migrate to, and pin, the domain walls. The pinning energies are
reported for each of the three possible orientations of the original Ti-O-Ti
bonds, and attempts to model the results with simple continuum models are
discussed.Comment: 8 pages, with 3 postscript figures embedded. Uses REVTEX and epsf
macros. Also available at
http://www.physics.rutgers.edu/~dhv/preprints/lh_dw/index.htm
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