Photocurrents and thermally stimulated currents in epoxy resin: effects of mechanical stress

1988 ◽  
Vol 23 (2) ◽  
pp. 201-208 ◽  
Author(s):  
A. Kawamoto ◽  
Y. Suzuoki ◽  
T. Ikejiri ◽  
T. Mizutani ◽  
M. Ieda
Keyword(s):  
Epoxy Resin ◽  
Mechanical Stress ◽  
Thermally Stimulated Currents

Improvement on Surface Tracking and Tensile Stress of Insulator via the Used of Aluminium Oxide Filler

2016 ◽  
Vol 705 ◽  
pp. 98-102
Author(s):  
Nutsopin Nilbunpot ◽  
Amnart Suksri
Keyword(s):  
Tensile Stress ◽  
Transmission Line ◽  
Epoxy Resin ◽  
Mechanical Stress ◽  
Electrical Power ◽  
Mechanical Effect ◽  
Electrical Insulation ◽  
Insulator Surface ◽  
Surface Tracking ◽  
Tracking Time

Mechanical effect is one of many causes that influence surface tracking activity of electrical insulation. Mechanical stress is also a main cause that deteriorates the property of cable spacer used in delivered electrical power through transmission line. This paper investigates on surface tracking and tensile stress performance of composite insulator material in order to improve insulator property. Specimen were made from epoxy resin and additive fillers tested under the condition of contamination. The filler ratio were used from 0 to 50% with incremental of 10%.The result showed that fillers have significance improvement on inhibition of the degradation on insulators when the concentration of filler is increased, the tracking time has increased until 40% of filler. Moreover, the improvement on the tensile stress is also increased. It is clearly showed that addition of filler not only improve on the time for surface tracking on insulator surface but also helps improve on mechanical stress property of insulators as well.

The Effect of Mechanical Stress and Surface Tracking of 22 kV Cable Spacer

2015 ◽  
Vol 1119 ◽  
pp. 769-774
Author(s):  
Nutsopin Nilbunpot ◽  
Amnart Suksri
Keyword(s):  
Epoxy Resin ◽  
Mechanical Stress ◽  
Mechanical Load ◽  
Tracking Performance ◽  
Electrical Field ◽  
Resin Sample ◽  
Pure Epoxy ◽  
Surface Tracking ◽  
High Electrical Field ◽  
Insulation Performance

Surface tracking is one of the causes that degraded the property of cable spacer. This research investigates about the mechanical stress and surface tracking performance of 22 kV cable spacer. Sample were tested according to the surface tracking under IEC 60587 standard under modified condition by and addition of the mechanical weight on the surface of pure epoxy resin sample. The mechanical load use were 0 kg and increase from 5 kg until 15 kg. The results showed that mechanical stress has affected the surface degradation of an insulation performance when the mechanical load is increased combined with high electrical field.

Photocurrents and thermally stimulated currents in epoxy resin composites

2003 ◽  
Author(s):  
A. Kawamoto ◽  
Y. Suzuoki ◽  
T. Ikejiri ◽  
T. Mizutani ◽  
M. Ieda
Keyword(s):  
Epoxy Resin ◽  
Resin Composites ◽  
Thermally Stimulated Currents ◽  
Epoxy Resin Composites

scholarly journals Photocurrents and Thermally Stimulated Currents in Epoxy-Resin Composite Insulating Systems

1990 ◽  
Vol 110 (12) ◽  
pp. 881-887
Author(s):  
Akira Kawamoto ◽  
Yasuo Suzuoki ◽  
Tadao Ikejiri ◽  
Teruyosi Mizutani ◽  
Masayuki Ieda
Keyword(s):  
Epoxy Resin ◽  
Resin Composite ◽  
Thermally Stimulated Currents ◽  
Epoxy Resin Composite

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

Surface Structure in Microtomed Sections Caused by Glass and Diamond Knives

1971 ◽  
Vol 29 ◽  
pp. 456-457
Author(s):  
J. Temple Black ◽  
William G. Boldosser
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Carbon Coating ◽  
Surface Damage ◽  
Body Angle ◽  
Normal Manner ◽  
Bottom Side ◽  
Cutting Direction ◽  
Made In ◽  
Diamond Knife

Ultramicrotomy produces plastic deformation in the surfaces of microtomed TEM specimens which can not generally be observed unless special preparations are made. In this study, a typical biological composite of tissue (infundibular thoracic attachment) infiltrated in the normal manner with an embedding epoxy resin (Epon 812 in a 60/40 mixture) was microtomed with glass and diamond knives, both with 45 degree body angle. Sectioning was done in Portor Blum Mt-2 and Mt-1 microtomes. Sections were collected on formvar coated grids so that both the top side and the bottom side of the sections could be examined. Sections were then placed in a vacuum evaporator and self-shadowed with carbon. Some were chromium shadowed at a 30 degree angle. The sections were then examined in a Phillips 300 TEM at 60kv.Carbon coating (C) or carbon coating with chrom shadowing (C-Ch) makes in effect, single stage replicas of the surfaces of the sections and thus allows the damage in the surfaces to be observable in the TEM. Figure 1 (see key to figures) shows the bottom side of a diamond knife section, carbon self-shadowed and chrom shadowed perpendicular to the cutting direction. Very fine knife marks and surface damage can be observed.

Epoxy Resin Embedment

1968 ◽  
Vol 26 ◽  
pp. 100-101
Author(s):  
J. G. Adams ◽  
M. M. Campbell ◽  
H. Thomas ◽  
J. J. Ghldonl
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Epoxy Resin ◽  
Light Microscope ◽  
Epoxy Resins ◽  
Image Contrast ◽  
Tissue Preservation ◽  
Resin System ◽  
Excellent Quality

Since the introduction of epoxy resins as embedding material for electron microscopy, the list of new formulations and variations of widely accepted mixtures has grown rapidly. Described here is a resin system utilizing Maraglas 655, Dow D.E.R. 732, DDSA, and BDMA, which is a variation of the mixtures of Lockwood and Erlandson. In the development of the mixture, the Maraglas and the Dow resins were tested in 3 different volumetric proportions, 6:4, 7:3, and 8:2. Cutting qualities and characteristics of stability in the electron beam and image contrast were evaluated for these epoxy mixtures with anhydride (DDSA) to epoxy ratios of 0.4, 0.55, and 0.7. Each mixture was polymerized overnight at 60°C with 2% and 3% BDMA.Although the differences among the test resins were slight in terms of cutting ease, general tissue preservation, and stability in the beam, the 7:3 Maraglas to D.E.R. 732 ratio at an anhydride to epoxy ratio of 0.55 polymerized with 3% BDMA proved to be most consistent. The resulting plastic is relatively hard and somewhat brittle which necessitates trimming and facing the block slowly and cautiously to avoid chipping. Sections up to about 2 microns in thickness can be cut and stained with any of several light microscope stains and excellent quality light photomicrographs can be taken of such sections (Fig. 1).

The Application of Ultra-Thin Sectioning Techniques to Non-Biological Samples

1968 ◽  
Vol 26 ◽  
pp. 332-333
Author(s):  
C. F. Oster
Keyword(s):  
Biological Sciences ◽  
Epoxy Resin ◽  
Cross Sections ◽  
Biological Samples ◽  
Industrial Applications ◽  
Photographic Film ◽  
Silver Particles ◽  
Thin Sectioning ◽  
Embedding Medium

Although ultra-thin sectioning techniques are widely used in the biological sciences, their applications are somewhat less popular but very useful in industrial applications. This presentation will review several specific applications where ultra-thin sectioning techniques have proven invaluable.The preparation of samples for sectioning usually involves embedding in an epoxy resin. Araldite 6005 Resin and Hardener are mixed so that the hardness of the embedding medium matches that of the sample to reduce any distortion of the sample during the sectioning process. No dehydration series are needed to prepare our usual samples for embedding, but some types require hardening and staining steps. The embedded samples are sectioned with either a prototype of a Porter-Blum Microtome or an LKB Ultrotome III. Both instruments are equipped with diamond knives.In the study of photographic film, the distribution of the developed silver particles through the layer is important to the image tone and/or scattering power. Also, the morphology of the developed silver is an important factor, and cross sections will show this structure.

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