scholarly journals First results with the ANET Compact Thermal Neutron Collimator

2021 ◽  
Vol 16 (11) ◽  
pp. P11025
Author(s):  
O. Sans-Planell ◽  
M. Costa ◽  
E. Durisi ◽  
E. Mafucci ◽  
L. Menzio ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Potential Application ◽  
Neutron Imaging ◽  
Field Of View ◽  
Medium Size ◽  
Neutron Sources ◽  
First Results ◽  
Limited Length ◽  
Measuring Campaign

Abstract This paper presents the first determination of the spatial resolution of the ANET Compact Neutron Collimator, obtained with a measuring campaign at the LENA Mark-II TRIGA reactor in Pavia. This novel collimator consists of a sequence of collimating and absorbing channels organised in a chessboard-like geometry. It has a scalable structure both in length and in the field of view. It is characterized by an elevated collimation power within a limited length. Its scalability and compactness are added values with respect to traditional collimating system. The prototype tested in this article is composed of 4 concatenated stages, each 100 mm long, with a channel width of 2.5 mm, delivering a nominal L/D factor of 160. This measuring campaign illustrates the use of the ANET collimator and its potential application in neutron imaging for facilities with small or medium size neutron sources.

First Results of the DITO-Experiment at the HARWI II Beamline at GKSS/DESY

2008 ◽  
Vol 571-572 ◽  
pp. 201-206 ◽  
Author(s):  
Bernd Hasse ◽  
Helene Rahn ◽  
Stefan Odenbach ◽  
Felix Beckmann ◽  
Walter Reimers
Keyword(s):  
Phase Composition ◽  
Spatial Resolution ◽  
High Speed ◽  
High Energy ◽  
First Results ◽  
Sensitive Determination ◽  
Phase Sensitive ◽  
Position Sensitive ◽  
Speed Mode

At the HARWI II beamline at the GKSS outstation at DESY a new experiment for position sensitive diffractometry and tomography called DITO was built and commissioned this year. Due to the available high energy synchrotron radiation with photon energies up to 100 keV it is possible to investigate the bulk of metallic samples of a few mm thickness with both methods. The diffractometry detector allows the investigation of the phase composition as well as phase sensitive determination of residual stresses with a spatial resolution of 6 μm while the tomography detector can either measure a whole tomogram in high resolution mode with a spatial resolution of 2 μm within 3 to 4 hours or in high speed mode recording a whole tomogram within 15 seconds with a spatial resolution of 40 μm.

White Beam Microdiffraction Experiments for the Determination of the Local Plastic Behaviour of Polycrystals

2006 ◽  
Vol 524-525 ◽  
pp. 103-108 ◽  
Author(s):  
Olivier Castelnau ◽  
Philippe Goudeau ◽  
G. Geandier ◽  
Nobumichi Tamura ◽  
Jean Luc Béchade ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Elastic Strain ◽  
Mean Field ◽  
Polycrystalline Materials ◽  
Plastic Behavior ◽  
Full Field ◽  
White Beam ◽  
First Results ◽  
Individual Grains

The overall plastic behavior of polycrystalline materials strongly depends on the microstructure and on the local rheology of individual grains. The characterization of the strain and stress heterogeneities within the specimen, which result from the intergranular mechanical interactions, is of particular interest since they largely control the microstructure evolutions such as texture development, work-hardening, damage, recrystallization, etc. The influence of microstructure on the effective behavior can be addressed by physical-based predictive models (homogenization schemes) based either on full-field or on mean-field approaches. But these models require the knowledge of the grain behavior, which in turn must be determined on the real specimen under investigation. The microextensometry technique allows the determination of the surface total (i.e. plastic + elastic) strain field with a micrometric spatial resolution. On the other hand, the white beam X-ray microdiffraction technique developed recently at the Advanced Light Source enables the determination of the elastic strain with the same spatial resolution. For polycrystalline materials with grain size of about 10 micrometers, a complete intragranular mechanical characterization can thus be performed by coupling these two techniques. The very first results obtained on plastically deformed copper and zirconium specimens are presented.

Determination of the Recent Tectonic Movements Using GPS and Insar Methods; The First Results From the Eastern Part of the Gediz Graben

2015 ◽  
Author(s):  
Fatih POYRAZ ◽  
Orhan TATAR ◽  
Kemal Özgür HASTAOĞLU ◽  
İbrahim TİRYAKİOĞLU ◽  
Önder GÜRSOY ◽  
...  
Keyword(s):  
First Results ◽  
Tectonic Movements

PENENTUAN KRITERIA PENILAIAN KESAN JUMLAH LEUKOSIT PADA PEMERIKSAAN APUSAN DARAH TEPI

2018 ◽  
Vol 3 (2) ◽  
pp. 52-61
Author(s):  
Dzikra Arwie ◽  
Islawati
Keyword(s):  
Data Analysis ◽  
Statistical Analysis ◽  
Blood Cells ◽  
Blood Smear ◽  
White Blood Cells ◽  
Peripheral Blood Smear ◽  
Field Of View ◽  
Laboratory Observation ◽  
Number Of Cells

Leukocytes or white blood cells have a characteristic characteristic of different cells. Determination of the impression of the number of leukocytes is determined in the number of cells in the field of view. While the number of viewable field cells expressed is still quite varied. The purpose of this study was to determine the number of leukocytes in the field of view and expressed the impression of a sufficient amount. This research was conducted at the Laboratory of Health Analyst Department Panrita Husada Bulukumba on 9 April 2017 to 14 July 2017. This type of research is a laboratory observation that aims to determine the criteria for assessing the impression of the number of leukocytes on a peripheral blood smear. Data analysis using statistical analysis is the average and standard deviations to determine the impression of the number of leukocytes and use 3 inspection zones. The results of this study obtained results in zone IV the number of leukocyte impressions said to be sufficient was 7-10, in zone V the number of leukocyte impressions said to be sufficient was 4-9, and in zone VI the number of leukocyte impressions said to be sufficient was 3-8.  

New neutron imaging facility at the WWR-SM reactor: Design and first results

2021 ◽  
Vol 989 ◽  
pp. 164959
Author(s):  
B.A. Abdurakhimov ◽  
M.Yu. Tashmetov ◽  
B.S. Yuldashev ◽  
S.E. Kichanov ◽  
E.V. Lukin ◽  
...  
Keyword(s):  
Reactor Design ◽  
Neutron Imaging ◽  
First Results

scholarly journals Observing UT1-UTC with VGOS

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Rüdiger Haas ◽  
Eskil Varenius ◽  
Saho Matsumoto ◽  
Matthias Schartner
Keyword(s):  
Standard Deviation ◽  
Reference Frame ◽  
Earth Rotation ◽  
Space Observatory ◽  
International Earth Rotation ◽  
Onsala Space Observatory ◽  
X Band ◽  
First Results

AbstractWe present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using the VGOS stations at Ishioka in Japan and the Onsala twin telescopes in Sweden. These VGOS-B sessions were observed simultaneously to standard legacy S/X-band Intensive sessions. The VGOS-B data were correlated, post-correlation processed, and analysed at the Onsala Space Observatory. The derived UT1-UTC results were compared to corresponding results from standard legacy S/X-band Intensive sessions (INT1/INT2), as well as to the final values of the International Earth Rotation and Reference Frame Service (IERS), provided in IERS Bulletin B. The VGOS-B series achieves 3–4 times lower formal uncertainties for the UT1-UTC results than standard legacy S/X-band INT series. The RMS agreement w.r.t. to IERS Bulletin B is slightly better for the VGOS-B results than for the simultaneously observed legacy S/X-band INT1 results, and the VGOS-B results have a small bias only with the smallest remaining standard deviation.

Characterization and Control of Copper CMP with Optoacoustic Metrology

2001 ◽  
Vol 671 ◽  
Author(s):  
Michael Gostein ◽  
Paul Lefevre ◽  
Alex A. Maznev ◽  
Michael Joffe
Keyword(s):  
Film Thickness ◽  
Spatial Resolution ◽  
Chemical Mechanical Polishing ◽  
High Spatial Resolution ◽  
Mechanical Polishing ◽  
Length Measurement ◽  
And Control ◽  
Non Destructive

ABSTRACTWe discuss applications of optoacoustic film thickness metrology for characterization of copper chemical-mechanical polishing (CMP). We highlight areas where the use of optoacoustics for CMP characterization provides data complementary to that obtained by other techniques because of its ability to directly measure film thickness with high spatial resolution in a rapid, non-destructive manner. Examples considered include determination of planarization length, measurement of film thickness at intermediate stages of polish, and measurement of arrays of metal lines.

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