Rubber, vulcanized or thermoplastic. Accelerated ageing and heat resistance tests

2015 ◽  
Keyword(s):  
Heat Resistance ◽  
Accelerated Ageing ◽  
Resistance Tests

Heat-Resistance Tests of High-Temperature Composite Materials via Laser Heating in a Supersonic Flow

2020 ◽  
Vol 58 (3) ◽  
pp. 393-399
Author(s):  
K. Yu. Aref’ev ◽  
S. V. Kruchkov ◽  
A. V. Glushneva ◽  
A. S. Saveliev ◽  
E. E. Son ◽  
...  
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Supersonic Flow ◽  
Heat Resistance ◽  
Laser Heating ◽  
Resistance Tests

THE ROLE OF THE PITUITARY IN THE RESISTANCE OF THE GOLDFISH (CARASSIUS AURATUS L.) TO A HIGH TEMPERATURE

1967 ◽  
Vol 45 (3) ◽  
pp. 329-345 ◽  
Author(s):  
Peter H. Johansen
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
Carassius Auratus ◽  
Essential Role ◽  
High Temperature Stress ◽  
Heat Resistant ◽  
Goldfish Carassius Auratus ◽  
Normal Fish ◽  
Resistance Tests

The heat resistance of normal, hypophysectomized and pituitary-autotransplanted goldfish acclimated to 20 °C under 16-h photoperiod and 8-h photoperiod conditions was determined. It was found that hypophysectomized goldfish were less heat resistant than normal fish and that those with an autotransplanted pituitary were as heat resistant as normal fish.The photoperiod results, though inconclusive, suggest that normal 16-h photoperiod fish are more heat resistant than normal 8-h photoperiod fish and that only the fish with a normal pituitary can respond to photoperiod changes. The fish without a pituitary are slightly less heat resistant than normal 8-h-photoperiod fish, while those possessing an autotransplanted pituitary are as resistant to a high temperature as normal 16-h-photo period fish.Treatment of hypophysectomized goldfish with luteinizing, thyrotropic, adrenocorticotropic, and lactotropic (prolactin) hormones and crude salmon pituitary extract appeared not to affect resistance to a high temperature.In the experiments involving pituitary autotransplantation, a study was made of various organs influenced by pituitary secretions to determine the pattern of hormone output by the pituitary. By contrasting this information with that of the heat resistance tests, various hormones have been suggested as not playing an essential role in high temperature resistance. The hypothesis is put forward that a prolactin-like hormone plays the essential role in resisting a high-temperature stress.

scholarly journals The source ofYersiniaspp. in pasteurized milk: an investigation at a dairy

1990 ◽  
Vol 104 (3) ◽  
pp. 351-360 ◽  
Author(s):  
M. H. Greenwood ◽  
W. L. Hooper ◽  
J. C. Rodhouse
Keyword(s):  
Heat Resistance ◽  
Environmental Contamination ◽  
Raw Milk ◽  
Pasteurized Milk ◽  
Milk Bottle ◽  
Temperature Conditions ◽  
Rinse Water ◽  
Proper Operation ◽  
Resistance Tests

SUMMARYPasteurized bottled milk supplied by a single dairy was frequently found to be contaminated withYersiniaspp. Investigations were carried out at the dairy in an effort to pinpoint the source of these organisms. Viable counts obtained from milk bottle rinses indicated that bottle washing was often unsatisfactory, and on one occasionY. frederikseniiwas isolated from the pooled rinse water of six bottles. Samples of milk were taken on arrival at the dairy and at various stages following pasteurization. Heat resistance tests carried out on strains of yersinia isolated from pasteurized milk indicated that they would not survive the pasteurization process. However two strains of yersinia were isolated from a sample of milk taken immediately after pasteurization but before bottling. The thermograph indicated that the time/temperature conditions applied during pasteurization were adequate. The presence of yersinia strains in the milk at this stage therefore suggests that undetectable levels of raw milk were being allowed to contaminate the pasteurized milk. The absence of yersinia in cartoned samples produced on the same day as contaminated bottled samples indicated that environmental contamination of the bottle filler valve also may have occurred at times. Results of this investigation indicate that increased vigilance is required to ensure proper operation of pasteurizers and bottle washers.

scholarly journals Characterization in expected working environments of recyclable fire-resistant materials

2021 ◽  
Vol 349 ◽  
pp. 01009
Author(s):  
Giulia De Aloysio ◽  
Mattia Morganti ◽  
Luca Laghi ◽  
Matteo Scafè ◽  
Enrico Leoni ◽  
...  
Keyword(s):  
Fire Resistance ◽  
Raw Materials ◽  
Accelerated Ageing ◽  
Structural Components ◽  
Thermal Insulating ◽  
Working Environments ◽  
Fibre Metal ◽  
Thermophysical Characterization ◽  
Resistance Tests

This study focuses on the development of multi-material solutions for fire-resistant structural materials for transport and thermal insulation in the construction field. Special attention was paid to combining recyclable and bio-mass derived raw materials without interfering with an easy end-of-life separation, recycling and reuse. Fire-resistant biomass derived resins were associated with basalt derived Mineral Fibres (BDMF) in the form of prepregs, which were studied as semi-finished materials. Fire-resistance was obtained by associating these prepregs with thin gres tiles in the case of fire-resistant thermal insulating facades and with aluminum layers (giving origin to Fibre Metal Laminates-FML) in the case of structural components for transport applications. Thermophysical characterization of the solutions was carried out to assess both thermal conductivity and thermal diffusivity. Fire resistance tests were performed on FML to determine the number of Al layers needed to ensure fire resistance. Results suggest that fire resistance depends primarily on the number of Al layers, rather than on their thickness. Accelerated ageing tests (salty mist and freeze-thaw) were executed to predict durability in the expected working conditions. Results suggest a durability issue in FML with preceramic interface in salty environments.

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