Critical angle laser refractometer

2006 ◽  
Vol 77 (3) ◽  
pp. 035101 ◽  
Author(s):  
J. R. Castrejón-Pita ◽  
A. Morales ◽  
R. Castrejón-García
Keyword(s):  
Critical Angle ◽  
Laser Refractometer

Migration, Gender and Visual Culture:

MedienJournal ◽  
2017 ◽  
Vol 37 (3) ◽  
pp. 32-44 ◽  
Author(s):  
Ksenija Vidmar Horvat
Keyword(s):  
Cultural Studies ◽  
Visual Culture ◽  
Critical Angle ◽  
Visual Representations ◽  
Public Culture ◽  
Migration Studies ◽  
New Paradigm ◽  
Current Field ◽  
Shared Interest ◽  
European Migration

 This paper investigates visual representations of migrants in Slovenia. The focus is on immigrant groups from China and Thailand and the construction of their ‘ethnic’ presence in postsocialist public culture. The aim of the paper is to provide a critical angle on the current field of cultural studies as well as on European migration studies. The author argues that both fields can find a shared interest in mutual theoretical and critical collaboration; but what the two traditions also need, is to reconceptualize the terrain of investigation of Europe which will be methodologically reorganized as a post- 1989 and post-westernocentric. Examination of migration in postsocialism may be an important step in drawing the new paradigm.

scholarly journals Critical angle reflection imaging for quantification of molecular interactions on glass surface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guangzhong Ma ◽  
Runli Liang ◽  
Zijian Wan ◽  
Shaopeng Wang
Keyword(s):  
Refractive Index ◽  
Small Molecule ◽  
Molecular Interactions ◽  
Glass Surface ◽  
Critical Angle ◽  
Dynamic Range ◽  
Refractive Index Change ◽  
Label Free ◽  
Index Change ◽  
Sensing Range

AbstractQuantification of molecular interactions on a surface is typically achieved via label-free techniques such as surface plasmon resonance (SPR). The sensitivity of SPR originates from the characteristic that the SPR angle is sensitive to the surface refractive index change. Analogously, in another interfacial optical phenomenon, total internal reflection, the critical angle is also refractive index dependent. Therefore, surface refractive index change can also be quantified by measuring the reflectivity near the critical angle. Based on this concept, we develop a method called critical angle reflection (CAR) imaging to quantify molecular interactions on glass surface. CAR imaging can be performed on SPR imaging setups. Through a side-by-side comparison, we show that CAR is capable of most molecular interaction measurements that SPR performs, including proteins, nucleic acids and cell-based detections. In addition, we show that CAR can detect small molecule bindings and intracellular signals beyond SPR sensing range. CAR exhibits several distinct characteristics, including tunable sensitivity and dynamic range, deeper vertical sensing range, fluorescence compatibility, broader wavelength and polarization of light selection, and glass surface chemistry. We anticipate CAR can expand SPR′s capability in small molecule detection, whole cell-based detection, simultaneous fluorescence imaging, and broader conjugation chemistry.

Extension of forward modeling phase-screen code in isotropic and anisotropic media up to critical angle

Geophysics ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. SM107-SM114 ◽  
Author(s):  
James C. White ◽  
Richard W. Hobbs
Keyword(s):  
Critical Angle ◽  
Model Space ◽  
Anisotropic Media ◽  
Forward Modeling ◽  
Phase Screen ◽  
Computationally Efficient ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Phase Corrections ◽  
Converted Phases

The computationally efficient phase-screen forward modeling technique is extended to allow investigation of nonnormal raypaths. The code is developed to accommodate all diffracted and converted phases up to critical angle, building on a geometric construction method. The new approach relies upon prescanning the model space to assess the complexity of each screen. The propagating wavefields are then divided as a function of horizontal wavenumber, and each subset is transformed to the spatial domain separately, carrying with it angular information. This allows both locally accurate 3D phase corrections and Zoeppritz reflection and transmission coefficients to be applied. The phase-screen code is further developed to handle simple anisotropic media. During phase-screen modeling, propagation is undertaken in the wavenumber domain where exact expressions for anisotropic phase velocities are available. Traveltimes and amplitude effects from a range of anisotropic shales are computed and compared with previous published results.

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