Experimental results of multi-stage four quadrant phase mask coronagraph

2010 ◽  
Author(s):  
Pi. Baudoz ◽  
F. Assemat ◽  
R. Galicher ◽  
J. Baudrand ◽  
A. Boccaletti
Keyword(s):  
Experimental Results ◽  
Phase Mask ◽  
Multi Stage ◽  
Four Quadrant

scholarly journals Manufacturing of four-quadrant phase mask for nulling interferometry in the thermal infrared

2004 ◽  
Author(s):  
Frederic Lemarquis ◽  
Michel Lequime ◽  
Gerard Albrand ◽  
Ludovic Escoubas ◽  
Jean-Jacques Simon ◽  
...  
Keyword(s):  
Thermal Infrared ◽  
Phase Mask ◽  
Nulling Interferometry ◽  
Four Quadrant

The Four‐Quadrant Phase Mask Coronagraph. IV. First Light at the Very Large Telescope

2004 ◽  
Vol 116 (825) ◽  
pp. 1061-1071 ◽  
Author(s):  
A. Boccaletti ◽  
P. Riaud ◽  
P. Baudoz ◽  
J. Baudrand ◽  
D. Rouan ◽  
...  
Keyword(s):  
Phase Mask ◽  
Large Telescope ◽  
Very Large Telescope ◽  
Four Quadrant

scholarly journals Experimental results with a second-generation Roddier & Roddier phase mask coronagraph

2010 ◽  
Vol 509 ◽  
pp. A8 ◽  
Author(s):  
M. N'Diaye ◽  
K. Dohlen ◽  
S. Cuevas ◽  
P. Lanzoni ◽  
F. Chemla ◽  
...  
Keyword(s):  
Second Generation ◽  
Experimental Results ◽  
Phase Mask

The Four Quadrant Phase Mask Coronagraph and its avatars

2007 ◽  
Vol 8 (3-4) ◽  
pp. 298-311 ◽  
Author(s):  
Daniel Rouan ◽  
Jacques Baudrand ◽  
Anthony Boccaletti ◽  
Pierre Baudoz ◽  
Dimitri Mawet ◽  
...  
Keyword(s):  
Phase Mask ◽  
Four Quadrant

Treatments in the Context of Games

2011 ◽  
Author(s):  
Diana C. Mutz
Keyword(s):  
College Student ◽  
Experimental Situation ◽  
Experimental Results ◽  
Economic Games ◽  
Multi Stage ◽  
Student Subjects ◽  
Experimental Treatments

This chapter examines games-based treatments, which are an out-growth of conducting experiments online, where gaming seems only natural and where highly complex, multi-stage experimental treatments can be experienced by participants. It begins with a description of how treatments have been implemented in the context of several classic economic games using random population samples. In these studies, the biggest challenge is adapting the often complex instructions and expectations to a sample that is considerably less well educated on average than college student subjects. In order to play and produce valid experimental results, participants in the game have to understand clearly how it works and buy into the realism of the experimental situation.

scholarly journals Application of Bionic Technologies on the Fracturing Plug

Biomimetics ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 78
Author(s):  
Lin Chen ◽  
Ran Wei ◽  
Songbo Wei ◽  
Xinzhong Wang
Keyword(s):  
Hydraulic Fracturing ◽  
Dissolution Rate ◽  
Experimental Results ◽  
Hydrophobic Properties ◽  
Multi Stage ◽  
Bionic Surface ◽  
Zonal Isolation ◽  
Oil Gas

The dissolvable bridge plug is one of the most important tools for multi-stage hydraulic fracturing in the field of oil/gas development. The plug provides zonal isolation to realize staged stimulation and, after fracturing, the plug is fully dissolved in produced liquids. A bionic surface was introduced to improve the performance of the plug. Surface dimples in the micron dimension were prepared on the dissolvable materials of the plug. The experimental results showed that the surface dimples changed the hydrophilic and hydrophobic properties of the dissolvable materials. The dissolution rate has a great relation with the parameters of the dimples and can be controlled by choosing the dimples’ parameters to some degree.

scholarly journals Numerical simulation of the non-uniform flow in a full-annulus multi-stage axial compressor with the harmonic balance method

2020 ◽  
Vol 12 (3) ◽  
pp. 168781401989721 ◽  
Author(s):  
Haiou Sun ◽  
Meng Wang ◽  
Zhongyi Wang ◽  
Song Wang ◽  
Franco Magagnato
Keyword(s):  
Flow Field ◽  
Harmonic Balance ◽  
Axial Compressor ◽  
Harmonic Balance Method ◽  
Internal Flow ◽  
Uniform Flow ◽  
Experimental Results ◽  
Balance Method ◽  
Operating Characteristics ◽  
Multi Stage

To improve the understanding of unsteady flow in modern advanced axial compressor, unsteady simulations on full-annulus multi-stage axial compressor are carried out with the harmonic balance method. Since the internal flow in turbomachinery is naturally periodic, the harmonic balance method can be used to reduce the computational cost. In order to verify the accuracy of the harmonic balance method, the numerical results are first compared with the experimental results. The results show that the internal flow field and the operating characteristics of the multi-stage axial compressor obtained by the harmonic balance method coincide with the experimental results with the relative error in the range of 3%. Through the analysis of the internal flow field of the axial compressor, it can be found that the airflow in the clearance of adjacent blade rows gradually changes from axisymmetric to non-axisymmetric and then returns to almost completely axisymmetric distribution before the downstream blade inlet, with only a slight non-axisymmetric distribution, which can be ignored. Moreover, the slight non-axisymmetric distribution will continue to accumulate with the development of the flow and, finally, form a distinct circumferential non-uniform flow field in latter stages, which may be the reason why the traditional single-passage numerical method will cause certain errors in multi-stage axial compressor simulations.

Ground-based coronagraphy: performance of a four-quadrant phase mask

2003 ◽  
Author(s):  
Stefan Hippler ◽  
Ernst-Bernhard Kley ◽  
Joana Costa ◽  
Elena Puga ◽  
Markus Feldt ◽  
...  
Keyword(s):  
Phase Mask ◽  
Four Quadrant
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