scholarly journals Reversible Diffraction Efficiency of Photochromic Polymer Gratings Related to Photoinduced Dimensional Changes

2008 ◽  
Vol 18 (11) ◽  
pp. 1617-1623 ◽  
Author(s):  
Despina Fragouli ◽  
Luana Persano ◽  
Giovanni Paladini ◽  
Dario Pisignano ◽  
Riccardo Carzino ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Dimensional Changes ◽  
Photochromic Polymer ◽  
Polymer Gratings

Criteria for the evaluation of low-temperature Scanning Electron Microscopy

1986 ◽  
Vol 44 ◽  
pp. 902-903
Author(s):  
Alan Beckett
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Temperature ◽  
Conformational Changes ◽  
Chemical Vapour ◽  
List Type ◽  
Dimensional Changes ◽  
Critical Point Drying ◽  
Temperature Scanning ◽  
Scanning Electron

Low temperature scanning electron microscopy (LTSEM) has been evaluated with special reference to its application to the study of morphology and development in microorganisms. A number of criteria have been considered and have proved valuable in assessing the standard of results achieved. To further aid our understanding of these results, it has been necessary to compare those obtained by LTSEM with those from more conventional preparatory procedures such as 1) chemical fixation, dehydration and critical point-drying; 2) freeze-drying with or without chemical vapour fixation before hand.The criteria used for assessing LTSEM for the above purposes are as follows: 1)Specimen immobilization and stabilization2)General preservation of external morphology3)General preservation of internal morphology4)Exposure to solvents5)Overall dimensional changes6)Cell surface texture7)Differential conformational changes8)Etching frozen-hydrated material9)Beam damage10)Specimen resolution11)Specimen life

INVAR

Alloy Digest ◽  
1964 ◽  
Vol 13 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Iron Alloy ◽  
Heat Treating ◽  
Temperature Variations ◽  
Nickel Iron ◽  
Dimensional Changes ◽  
Temperature Performance ◽  
Nickel Iron Alloy

Abstract INVAR is a 36% nickel-iron alloy having the lowest coefficient of expansion, recommended for applications requiring no dimensional changes with temperature variations. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Fe-24. Producer or source: Carpenter.

DEUTSCHE EDELSTAHLWERKE CRYODUR 2067

Alloy Digest ◽  
2020 ◽  
Vol 69 (2) ◽  
Keyword(s):  
Cold Work ◽  
High Surface ◽  
Surface Hardness ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Dimensional Changes ◽  
Short Run ◽  
Quench Hardening ◽  
Specialty Steel ◽  
Cold Work Tool Steel

Abstract Deutsche Edelstahlwerke Cryodur 2067 is a high-carbon, 1.5% chromium, alloy cold-work tool steel. In view of its higher hardenability than that of the non-alloy, water-hardening, cold work tool steels, this steel can be oil quenched, a factor that minimizes dimensional changes during quench hardening. Cryodur 2067 is suitable for short run tooling in applications requiring high surface hardness. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-786. Producer or source: Deutsche Edelstahlwerke Specialty Steel.

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