Mechanical analysis and measurement of wheel-rail contact system in large aperture radio telescope

2016 ◽  
Author(s):  
Z.P. Chen ◽  
D.Q. Kong ◽  
C.G. Li ◽  
N.J. Zhu ◽  
H.L. Shi
Keyword(s):  
Radio Telescope ◽  
Mechanical Analysis ◽  
Contact System ◽  
Large Aperture

Removal Method of Core Shaft of Primary Mirror

2013 ◽  
Vol 552 ◽  
pp. 221-226
Author(s):  
Qi Rui Xu ◽  
Fan Wu
Keyword(s):  
Mechanical Analysis ◽  
Primary Mirror ◽  
Supporting Structure ◽  
Removal Method ◽  
The Core ◽  
Large Aperture

The structure of core shaft combined with mercury belt is widely used as the primary mirror supporting structure of 1 meter class and 2 meter class large aperture telescope currently. In order to reduce the structure jitter of primary mirror, the fitting clearance between core shaft and shaft sleeve is very small, so clamping stagnation occurs during installation and disassembling process of core shaft. The removal method of clamping stagnation of core shaft is introduced. Mechanical analysis of core shaft and primary mirror is applied to make sure that the primary mirror is safe. Some tools are designed specially, and the process and the attention points to remove core shaft are introduced. In this way, the clamping stagnation of core shaft can be removed easily. The core shaft of 1 m class primary mirror was removed by the method and the primary mirror was excellent without damage.

Radio Telescope Antennas of Large Aperture

1958 ◽  
Vol 46 (1) ◽  
pp. 92-97 ◽  
Author(s):  
John Kraus
Keyword(s):  
Radio Telescope ◽  
Large Aperture

scholarly journals Magnetic and Mechanical Analysis of a Large Aperture 15T Cable Test Facility Dipole Magnet

2021 ◽  
pp. 1-1
Author(s):  
Giorgio Vallone ◽  
Diego Arbelaez ◽  
Douglas Martins Araujo ◽  
Amalia Ballarino ◽  
Paolo Ferracin ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Test Facility ◽  
Dipole Magnet ◽  
Large Aperture

Interpretation of the Filament Depression at Millimetric and Centimetric Wavelengths

1979 ◽  
Vol 44 ◽  
pp. 131-134
Author(s):  
A. Raoult ◽  
P. Lantos ◽  
E. Fürst
Keyword(s):  
Radio Telescope ◽  
Active Regions ◽  
Simple Shape ◽  
Quiet Sun ◽  
Unstable Process

The depressions at centimetric and millimetric wavelengths associated with the filaments are studied using already published maps as well as unpublished observations from the Effelsberg 100 m radio telescope of the M.P.I., Bonn. The study has been restricted to large Ha quiescent prominences of relatively simple shape, situated far from the limb and from active regions. The data has been reduced employing one method whose main characteristics are choice of a local quiet sun definition and avoidance of the unstable process of deconvolution.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Sign in / Sign up

Export Citation Format

Share Document