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Abstract

Thanks to their excellent strength and durability, composite materials are used to manufacture many important structural elements. In the face of their extensive use, it is crucial to seek suitable methods for monitoring damages and locating their origins. The purpose of the article was to verify the possibility of applying the acoustic emissions (AE) method in the detection of damages in the structures of composite materials. The experimental part comprised static tensile tests carried out on various sandwich composites, including simultaneous registration of elastic waves with increasing loads, carried out with the use of an acousticelectrical sensor connected. The signal obtained from the sensor was then further processed and used to draw up diagrams of the AE hits, amplitude, root mean square of the AE source signal (RMS) and duration in the function of time. These diagrams were then applied on their corresponding stretching curves, the obtained charts were analysed. The results obtained point to a conclusion that the acoustic emissions method can be successfully used to detect and locate composite material damages.
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Bibliography

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Authors and Affiliations

Katarzyna Panasiuk
1
Krzysztof Dudzik
2
Grzegorz Hajdukiewicz
1

  1. Gdynia Maritime University, Faculty of Marine Engineering, Department of Engineering Sciences, Gdynia, Poland
  2. Gdynia Maritime University, Faculty of Marine Engineering, Marine Maintenance Department, Gdynia, Poland
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Abstract

Since drug companies are driven by the need to produce profit they are unwilling to make large investments in the development of new drugs if there is no market large enough to justify such investment. For this reason, veterinarians face a major obstacle – the veterinary drug market is not very profitable, which sometimes leads to not having a licensed drug available for treatment in veterinary practice. In this case, the cascade procedure allows veterinarians to, under certain circumstances, prescribe human approved drugs. The aim of our study was to analyze the pattern of human approved drugs prescription for 150 medical records of dogs participating in the survey. The results show that antimicrobial agents were the most commonly prescribed drugs for animals (50%) of all human approved drugs, and beta-lactams (38.6%) were the most widely used antibiotic classes. The most common general conditions for therapeutic use of antimicrobials in this study were digestive, skin and respiratory disorders. Our study shows that the frequency of bacterial culture, susceptibility testing and cytology was very low. Even though the off-label use of human approved drugs in animal practice is regulated by law, the results of this study indicate the need for more specific strategies and guidelines for such use. This may represent a potential for improvement by raising veterinarians’ awareness toward more prudent use of human drugs.
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Authors and Affiliations

D. Tomanic
1
D. Stojanovic
1
B. Belić
1
I. Davidov
1
N. Novakov
1
M. Radinovic
1
N. Kladar
2
Z. Kovacevic
1

  1. University of Novi Sad, Department of Veterinary Medicine, Faculty of Agriculture, Trg Dositeja Obradovica 8, 21 000 Novi Sad, Serbia
  2. University of Novi Sad, Center for Medical and Pharmaceutical Investigations and Quality Control/Department of Pharmacy, Faculty of Medicine, Hajduk Veljkova 3, 21000 Novi Sad, Serbia

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