Plastics. Phenolic resin powder. Determination of flow distance on a heated glass plate

2005 ◽  
Keyword(s):  
Phenolic Resin ◽  
Glass Plate ◽  
Heated Glass

A DETERMINATION OF THE DISTORTION IN A NUMBER OF AIR CAMERA LENSES

1934 ◽  
Vol 10 (2) ◽  
pp. 239-243 ◽  
Author(s):  
R. H. Field
Keyword(s):  
Focal Length ◽  
Glass Plate ◽  
Linear Displacement ◽  
Lens Distortion ◽  
Lens Design

For map plotting purposes it is essential to know the principal distance (focal length) of air cameras, preferably for rays making various angles with the lens axis. A compact apparatus has been developed for making the necessary measurements and has been used for investigating the lens distortion in a number of air cameras. This method of finding distortion has the advantage that it takes into account the effect of the glass plate fitted in film cameras to maintain the film flat during exposure.The distortion is given as the linear displacement in the plane of the photograph. It is felt that in this form the results are of more interest to those using air photographs. By simple calculations the figures can be changed to give the distortion in the forms more usual in the treatment of lens design.

Effect of Delamination on the Strength of Laminated Glass Plate Structures

2014 ◽  
Vol 487 ◽  
pp. 181-184 ◽  
Author(s):  
M. Zülfü Aşık ◽  
Ebru Dural
Keyword(s):  
Large Deflection ◽  
Glass Plate ◽  
Polyvinyl Butyral ◽  
Laminated Glass ◽  
Plate Structures ◽  
Order Difference ◽  
Deflection Analysis ◽  
History Of ◽  
Glass Unit

Laminated glass which consists of two glass sheets connected to each other with PVB interlayer is used in many engineering applications for years. Despite the long history of the use of laminated glass in buildings there are serious problems about delamination of laminated glass units. This paper provides information about delamination issues of laminated glass plate structures. Delamination of laminated glass unit may be due to the thinning of PVB (Polyvinyl Butyral) interlayer or the folds which occur during the manufacturing process. Laminated glass behaves in a complex manner due to the effect of geometry that undergoes large deflection even under their own weight and the order difference between the elastic modulus of glass and interlayer. Because of the mentioned reasons large deflection analysis has to be performed in the determination of the effect of delamination on the strength of laminated glasses.

scholarly journals Analytical methods for the determination of Cr6+ from fixed source emissions

2020 ◽  
Vol 2 (2) ◽  
pp. 185-192
Author(s):  
Mihaela Petrescu ◽  
◽  
Elena Bucur ◽  
Valeriu Danciulescu ◽  
Andreea Cozea ◽  
...  
Keyword(s):  
Analytical Methods ◽  
Limit Of Detection ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Operating Conditions ◽  
Molecular Absorption ◽  
Limit Of Quantification ◽  
Furnace Atomization ◽  
Heated Glass

This study aimed to develop two analytical methods for the determination of Cr6+ from fixed source emissions, such as the molecular absorption spectrophotometric method (UV-VIS) and the graphite furnace atomization absorption spectrometry method (GTAAS). The first stage in the development of analytical methods involves establishing the optimal operating conditions for, taking air samples, treating them for analysis, and the proceeding for analysis, followed by validating the method by determining performance parameters. For both methods is highly recommended, the use of isokinetic sampling with a sampling probe by the heated glass, quartz, or PTFE. The limit of detection and the limit of quantification were concluded to be 12.38µg/m3 and 40µg/m3, respectively for the UV-VIS method and the GTAAS method 0.12 µg/m3 and 0.54 µg/m3 respectively.

Tribiological behavior of modified phenolic resin composites for braking applications

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fikrat Yusubov
Keyword(s):  
Thermal Properties ◽  
Phenolic Resin ◽  
Degradation Mechanism ◽  
Mechanical And Thermal Properties ◽  
Content Type ◽  
Dry Conditions ◽  
Powder Metallurgy Methods ◽  
Thermal Stability Of

Purpose The purpose of this paper is to investigate the influence of binder effect on tribological behavior of brake friction composite materials: a case study of phenolic resin modified by N-Methylaniline. Design/methodology/approach Four different friction materials have been fabricated by varying modified phenolic resin content. The samples were prepared by the conventional powder metallurgy methods following ball milling, mixing, pre-forming, hot pressing and post-curing processes. Thermogravimetric analysis was used to determination of the degradation mechanism of organic components and study of thermal stability of the samples. A friction test was carried out in dry conditions using a vertical tribometer. Analysis of worn surfaces was performed using a scanning electron microscope. Findings The experimental results revealed that the sample containing 25 Wt.% phenolic resin has good mechanical and thermal properties with stable friction characteristics. Originality/value This paper presents the effect of N-methylaniline modified phenolic resin on friction composites to improve tribological performance by its thermal properties.

On convection under an air surface

1967 ◽  
Vol 30 (1) ◽  
pp. 9-15 ◽  
Author(s):  
E. L. Koschmieder
Keyword(s):  
Constant Temperature ◽  
Silicone Oil ◽  
Fluid Layer ◽  
Accurate Determination ◽  
Glass Plate ◽  
Copper Plate ◽  
Hexagonal Pattern ◽  
Shallow Layer

A shallow layer of silicone oil on a plane, circular copper plate was uniformly heated from below. The air on its surface was kept at constant temperature by a uniformly cooled glass plate close to the oil, which at the same time inhibited air motions. Motions began with concentric circular rolls which, after the centre ring had formed, broke down into a hexagonal pattern. A rather accurate determination of the wavelength of the motions was possible. The wavelength was found to be variable with the depth of the fluid layer in qualitative accordance with the theory of Nield. Supercritical motions are briefly discussed.

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