On the space resolution of the μ-RWELL

Hindcasted wind and wave data, available on a coarse resolution global grid (Copernicus ERA5 dataset), are downscaled by means of the numerical model SWAN (simulating waves in the nearshore) to produce time series of wave conditions at a high resolution along the Italian coasts in the central Tyrrhenian Sea. In order to achieve the proper spatial resolution along the coast, the finite element version of the model is used. Wave data time series at the ERA5 grid are used to specify boundary conditions for the wave model at the offshore sides of the computational domain. The wind field is fed to the model to account for local wave generation. The modeled sea states are compared against the multiple wave records available in the area, in order to calibrate and validate the model. The model results are in quite good agreement with direct measurements, both in terms of wave climate and wave extremes. The results show that using the present modeling chain, it is possible to build a reliable nearshore wave parameters database with high space resolution. Such a database, once prepared for coastal areas, possibly at the national level, can be of high value for many engineering activities related to coastal area management, and can be useful to provide fundamental information for the development of operational coastal services.

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Artifacts in Simultaneous hdEEG/fMRI Imaging: A Nonlinear Dimensionality Reduction Approach

Sensors ◽

10.3390/s19204454 ◽

2019 ◽

Vol 19 (20) ◽

pp. 4454 ◽

Cited By ~ 2

Author(s):

Marek Piorecky ◽

Vlastimil Koudelka ◽

Jan Strobl ◽

Martin Brunovsky ◽

Vladimir Krajca

Keyword(s):

Data Structure ◽

Spatial Clustering ◽

Dimensional Space ◽

Head Movements ◽

Nonlinear Dimensionality Reduction ◽

Space Resolution ◽

Additional Information ◽

Nonlinear Dimension ◽

The Time Domain ◽

Low Dimensional

Simultaneous recordings of electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) are at the forefront of technologies of interest to physicians and scientists because they combine the benefits of both modalities—better time resolution (hdEEG) and space resolution (fMRI). However, EEG measurements in the scanner contain an electromagnetic field that is induced in leads as a result of gradient switching slight head movements and vibrations, and it is corrupted by changes in the measured potential because of the Hall phenomenon. The aim of this study is to design and test a methodology for inspecting hidden EEG structures with respect to artifacts. We propose a top-down strategy to obtain additional information that is not visible in a single recording. The time-domain independent component analysis algorithm was employed to obtain independent components and spatial weights. A nonlinear dimension reduction technique t-distributed stochastic neighbor embedding was used to create low-dimensional space, which was then partitioned using the density-based spatial clustering of applications with noise (DBSCAN). The relationships between the found data structure and the used criteria were investigated. As a result, we were able to extract information from the data structure regarding electrooculographic, electrocardiographic, electromyographic and gradient artifacts. This new methodology could facilitate the identification of artifacts and their residues from simultaneous EEG in fMRI.

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Space resolution obtained with a highly segmented SCIFI e.m. calorimeter

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/0168-9002(92)90723-h ◽

1992 ◽

Vol 315 (1-3) ◽

pp. 327-331 ◽

Cited By ~ 3

Author(s):

M. Bertino ◽

C. Bini ◽

D. De Pedis ◽

G. De Zorzi ◽

G. Diambrini Palazzi ◽

...

Keyword(s):

Space Resolution

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Total scattering experiments on glass and crystalline materials at the ESRF on the ID11 Beamline

Powder Diffraction ◽

10.1017/s0885715614001304 ◽

2014 ◽

Vol 30 (S1) ◽

pp. S2-S8 ◽

Cited By ~ 9

Author(s):

Andrea Bernasconi ◽

Jonathan Wright ◽

Nicholas Harker

Keyword(s):

High Energy ◽

Real Space ◽

European Synchrotron Radiation Facility ◽

Small Sample ◽

Distribution Functions ◽

Total Scattering ◽

Crystalline Materials ◽

Space Resolution ◽

Atomic Pair ◽

Counting Statistics

ID11 is a multi-purpose high-energy beamline at the European Synchrotron Radiation Facility (ESRF). Owing to the high-energy X-ray source (up to 140 keV) and flexible, high-precision sample mounting which allows small sample–detector distances to be achieved, experiments such as total scattering in transmission geometry are possible. This permits the exploration of a wide Q range and so provides high real-space resolution. A range of samples (glasses and crystalline powders) have been measured at 78 keV, first putting the detector as close as possible to the sample (~10 cm), and then moving it vertically and laterally with respect to the beam in order to have circular and quarter circle sections of diffraction rings, with consequent QMAX at the edge of the detector of about 16 and 28 Å−1, respectively. Data were integrated using FIT2D, and then normalized and corrected with PDFgetX3. Results have been compared to see the effects of Q-range and counting statistics on the atomic pair distribution functions of the different samples. A Q of at least 20 Å−1 was essential to have sufficient real-space resolution for both type of samples while statistics appeared more important for glass samples rather than for crystalline samples.

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Kinetics of Clobetasol-17-Propionate in Psoriatic Lesional and Non-Lesional Skin Assessed by Dermal Open Flow Microperfusion with Time and Space Resolution

Pharmaceutical Research ◽

10.1007/s11095-016-1960-y ◽

2016 ◽

Vol 33 (9) ◽

pp. 2229-2238 ◽

Cited By ~ 7

Author(s):

Manfred Bodenlenz ◽

Christian Dragatin ◽

Lisa Liebenberger ◽

Bernd Tschapeller ◽

Beate Boulgaropoulos ◽

...

Keyword(s):

Time And Space ◽

Lesional Skin ◽

Open Flow ◽

Space Resolution ◽

Kinetics Of

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Correction to “Particle-in-cell simulations of the lunar wake with high phase space resolution”

Geophysical Research Letters ◽

10.1029/2001gl012961 ◽

2001 ◽

Vol 28 (13) ◽

pp. 2669-2669 ◽

Cited By ~ 7

Author(s):

Paul C. Birch ◽

Sandra C. Chapman

Keyword(s):

Phase Space ◽

Particle In Cell ◽

Space Resolution ◽

Lunar Wake ◽

High Phase

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The Development of Extremely-Compact Static Pressure Probe for the Simultaneous Measurement of Pressure and Velocity in the Turbulent Flows

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora ◽

10.1115/ajk2011-31011 ◽

2011 ◽

Author(s):

Kazuhiro Onishi ◽

Osamu Terashima ◽

Yasuhiko Sakai ◽

Kouji Nagata

Keyword(s):

Turbulent Flows ◽

Simultaneous Measurement ◽

Measurement Accuracy ◽

Static Pressure ◽

Pressure Tube ◽

Pressure Probe ◽

External Diameter ◽

Space Resolution ◽

Mems Microphone ◽

Yaw Angle

A new static pressure probe was developed to improve the space resolution and the measurement accuracy of the combined probe for the simultaneous measurement of the static pressure and the velocity in turbulent flows. The external diameter of the static pressure tube is 0.3 mm and its internal diameter is 0.2 mm. There are 8 static pressure holes on the wall of the static pressure tube and their diameters are 0.1 mm. The MEMS microphone is used as the pressure sensor and embedded inside the flare of the static pressure tube. The diameter of the MEMS microphone is 2.54 mm and has the wide range flat frequency response. The measurement results by the new static pressure probe in the two-dimensional turbulent jet show that the measurement accuracy of the static pressure probe is sufficient and the seven-thirds power law is clearly observed in the power spectra of the fluctuating pressure measured at the position of a half width of the mean velocity distribution in the cross-streamwise direction apart from the jet center line. In addition, the yaw angle characteristics of this new pressure probe shows that the measurement accuracy of the static pressure has less dependency on the yaw angle of the probe to the flow direction than the one of the previous static pressure tube (its external diameter is 0.5 mm). From these results, it is found that the new static pressure probe is effective for the measurement of static pressure in turbulent flows and useful to improve the space resolution and the measurement accuracy of the combined probe for the simultaneous measurement of the velocity and the static pressure. By using this static pressure tube, the space resolution of the combined probe is reduced approximately 40%. Further, by combing two X-type hot-wire probes with the new pressure probe, the simultaneous measurement of three velocity components and static pressure is realized.

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Use of satellite data for detecting icebergs and evaluating the iceberg threats

Journal Ice and Snow ◽

10.15356/2076-6734-2018-4-537-551 ◽

2018 ◽

Vol 58 (4) ◽

pp. 537-551 ◽

Cited By ~ 2

Author(s):

I. A. Bychkova ◽

V. G. Smirnov

Keyword(s):

Satellite Data ◽

Radar Data ◽

Arctic Shelf ◽

The Arctic ◽

Satellite Monitoring ◽

Landsat 8 ◽

Space Resolution ◽

Detection Techniques ◽

Satellite Radar ◽

High Space

Te methods of satellite monitoring of dangerous ice formations, namely icebergs in the Arctic seas, representing a threat to the safety of navigation and economic activity on the Arctic shelf are considered. Te main objective of the research is to develop methods for detecting icebergs using satellite radar data and high space resolution images in the visible spectral range. Te developed method of iceberg detection is based on statistical criteria for fnding gradient zones in the analysis of two-dimensional felds of satellite images. Te algorithms of the iceberg detection, the procedure of the false target identifcation, and determination the horizontal dimensions of the icebergs and their location are described. Examples of iceberg detection using satellite information with high space resolution obtained from Sentinel-1 and Landsat-8 satellites are given. To assess the iceberg threat, we propose to use a model of their drif, one of the input parameters of which is the size of the detected objects. Tree possible situations of observation of icebergs are identifed, namely, the «status» state of objects: icebergs on open water; icebergs in drifing ice; and icebergs in the fast ice. At the same time, in each of these situations, the iceberg can be grounded, that prevents its moving. Specifc features of the iceberg monitoring at various «status» states of them are considered. Te «status» state of the iceberg is also taken into account when assessing the degree of danger of the detected object. Te use of iceberg detection techniques based on satellite radar data and visible range images is illustrated by results of monitoring the coastal areas of the Severnaya Zemlya archipelago. Te approaches proposed to detect icebergs from satellite data allow improving the quality and efciency of service for a wide number of users with ensuring the efciency and safety of Arctic navigation and activities on the Arctic shelf.

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