Comparison between the tilted SmC?* and SmC?* phases of MHPOBC studied by optical techniques

1994 ◽  
Vol 4 (12) ◽  
pp. 2149-2159 ◽  
Author(s):  
John Philip ◽  
Jean-Ren� Lalanne ◽  
Jean-Paul Marcerou ◽  
Gilles Sigaud
Keyword(s):  
Optical Techniques

scholarly journals An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1871
Author(s):  
Xinlu Yu ◽  
Yingqian Fu ◽  
Xinlong Dong ◽  
Fenghua Zhou ◽  
Jianguo Ning
Keyword(s):  
High Speed ◽  
Inverse Method ◽  
Image Correlation ◽  
Analysis Method ◽  
Stress Strain ◽  
Optical Techniques ◽  
Element Simulation ◽  
Non Linear ◽  
Constitutive Parameters ◽  
Inverse Analysis Method

The dynamic constitutive behaviors of concrete-like materials are of vital importance for structure designing under impact loading conditions. This study proposes a new method to evaluate the constitutive behaviors of ordinary concrete at high strain rates. The proposed method combines the Lagrangian-inverse analysis method with optical techniques (ultra-high-speed camera and digital image correlation techniques). The proposed method is validated against finite-element simulation. Spalling tests were conducted on concretes where optical techniques were employed to obtain the high-frequency spatial and temporal displacement data. We then obtained stress–strain curves of concrete by applying the proposed method on the results of spalling tests. The results show non-linear constitutive behaviors in these stress–strain curves. These non-linear constitutive behaviors can be possibly explained by local heterogeneity of concrete. The proposed method provides an alternative mean to access the dynamic constitutive behaviors which can help future structure designing of concrete-like materials.

scholarly journals Determination of non-linear refractive index of laser crystals and ceramics via different optical techniques

2020 ◽  
Vol 8 ◽  
pp. 100065
Author(s):  
Laurent Lamaignère ◽  
Guido Toci ◽  
Barbara Patrizi ◽  
Matteo Vannini ◽  
Angela Pirri ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Techniques ◽  
Linear Refractive Index ◽  
Non Linear ◽  
Laser Crystals

Novel electro-optical techniques in metrology

1976 ◽  
Vol 22 (1) ◽  
pp. 27 ◽  
Author(s):  
L. Balmer ◽  
A.H. Falkner ◽  
W.N. Taberner
Keyword(s):  
Optical Techniques

New optical techniques to improve the visibility of graphene on multiple substrates

2011 ◽  
Author(s):  
Hugo Gonçalves ◽  
Peter Schellenberg ◽  
Michael Belsley ◽  
Luís Alves ◽  
Cacilda Moura ◽  
...  
Keyword(s):  
Optical Techniques ◽  
Multiple Substrates

Optical techniques for perfusion monitoring of the gastric tube after esophagectomy: a review of technologies and thresholds

2018 ◽  
Vol 31 (6) ◽  
Author(s):  
S M Jansen ◽  
D M de Bruin ◽  
M I van Berge Henegouwen ◽  
S D Strackee ◽  
D P Veelo ◽  
...  
Keyword(s):  
Gastric Tube ◽  
Optical Techniques

Disorder-induced localization in(La0.4Pr0.6)1.2Sr1.8Mn2O7as investigated by variable-temperature optical techniques

2004 ◽  
Vol 69 (10) ◽  
Author(s):  
J. D. Woodward ◽  
J. Choi ◽  
J. L. Musfeldt ◽  
J. T. Haraldsen ◽  
M. Apostu ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Optical Techniques

Evaluation of temporal and spatial distribution of nanometric particles in a diesel engine by broadband optical techniques

2002 ◽  
Vol 3 (2) ◽  
pp. 93-101 ◽  
Author(s):  
F E Corcione ◽  
S S Merola ◽  
B M Vaglieco
Keyword(s):  
Diesel Engine ◽  
Ultrafine Particles ◽  
Combustion Process ◽  
Visible Region ◽  
Diesel Combustion ◽  
Temporal And Spatial Distribution ◽  
Optical Techniques ◽  
Engine Cylinder ◽  
Nanometric Particles ◽  
Temporal And Spatial

In the last few years, there has been an increasing concern about the emissions of ultrafine particles in the atmosphere. A detailed study of the formation and oxidation of these particles in the environment of the diesel engine cylinder presents many experimental difficulties due to the high temperatures, pressures and extremely reactive intermediate species. To allow investigation of the different phases of the diesel combustion process, high temporal and spatial resolution optical techniques were applied in the optically accessible chamber of a diesel engine at fixed engine speed and air-fuel ratio. Simultaneous extinction, scattering and flame chemiluminescence measurements from the ultraviolet to the visible region were carried out in order to study the diesel combustion process from the soot inception to the formation of soot particles, through the growth of their precursors. These species were characterized as carbonaceous nanometric structures and their sizes were evaluated by the Mie theory.

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