Optic-electronic autocollimation system for measuring line and angular deformation

2021 ◽  
Author(s):  
Dinh Duan Dang ◽  
Igor A. Konyakhin
Keyword(s):  
Measuring Line ◽  
Angular Deformation

The second-order deformation of a finite compressible isotropic elastic annulus subjected to circular shearing

1993 ◽  
Vol 442 (1916) ◽  
pp. 621-639 ◽  
Keyword(s):  
Hankel Transform ◽  
Outer Edge ◽  
Kernel Functions ◽  
Second Order ◽  
Cylindrical Hole ◽  
Angular Deformation ◽  
Interior Boundary ◽  
Order Deformation ◽  
Finite Hankel Transform

This work investigates the second-order deformation of a uniformly thick compressible isotropic elastic annulus with an axial cylindrical hole. The annulus is clamped at its outer edge and is subjected to a constant angular deformation on the interior boundary of the hole. The implicit m athematical solution is formulated in term s of finite Hankel transform s with Weber-Orr kernel functions which are then numerically inverted.

Axially Dynamic Implants for Stabilization of the Cervical Spine

2006 ◽  
Vol 59 (suppl_4) ◽  
pp. ONS-378-ONS-389 ◽  
Author(s):  
Michael P. Steinmetz ◽  
Edward C. Benzel ◽  
Ronald I. Apfelbaum
Keyword(s):  
Cervical Spine ◽  
Bone Graft ◽  
Spine Surgery ◽  
Bone Healing ◽  
Axial Load ◽  
Load Sharing ◽  
Postoperative Course ◽  
Angular Deformation ◽  
Naturally Occurring ◽  
Spine Instrumentation

Abstract OBJECTIVE: Subsidence is a naturally occurring process that is observed during aging and after spine surgery. Rigid cervical spine instrumentation is excellent for stabilizing the spine. These devices, however, also retard subsidence after surgery. Thus, the implant carries much of the axial load, rather than sharing the axial load with the bone graft. This results in an increased incidence of construct failures, pseudoarthrosis, or both, which often occur late in the postoperative course. METHODS: In contrast, dynamic implants allow normal (natural) subsidence to occur, while effectively stabilizing the spine by preventing translation, rotation, and angular deformation. Load sharing, which works with, instead of against, the normal biology of bone healing, occurs with axially dynamic implants, resulting in more robust and earlier fusions. RESULTS: Diminished incidences of construct failures have been reported with dynamic implants. CONCLUSION: Dynamic implants seem to be the system of choice for ventral cervical stabilization in selected patients.

METHODS OF MEASURING LINE INTENSITY IN RAMAN SPECTRA

1959 ◽  
Vol 2 (3) ◽  
pp. 436-443 ◽  
Author(s):  
P A Bazhulin ◽  
M M Sushchinskiĭ
Keyword(s):  
Raman Spectra ◽  
Line Intensity ◽  
Measuring Line
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