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Wyszukujesz frazę "Liu, Yulin" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
A risk assessment method of aircraft structure damage maintenance interval considering fatigue crack growth and detection rate
Autorzy:
Zhang, Zhuzhu
Mao, Haitao
Liu, Yulin
Jiao, Peng
Hu, Wenlin
Shen, Pei
Powiązania:
https://bibliotekanauki.pl/articles/24200796.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
Monte Carlo
risk assessment
maintenance interval
crack propagation
detection rate
condition based maintenance
Opis:
The accurate assessment of aircraft structure damage risk is the premise of establishing reasonable, economic and reliable maintenance intervals. While many studies have proposed damage risk assessment methods for aircraft structures, these methods lack the quantification of risk. This paper proposed a risk assessment method of aircraft structure damage maintenance interval considering fatigue crack growth rate and crack detection rate. The damage process of aircraft structure was simulated by Monte Carlo simulation to realize the quantitative assessment of aircraft structure damage risk and maintenance interval. Taking an aircraft fleet as an example, the damage risk of its wing structure was simulated and analyzed. The results show that if the risk is controlled within a reasonable range, the maintenance interval should be shortened to 16 flight hours. At the same time, through the analysis of the risk classification standard and the crack detection rate, the quantitative evaluation of the risk classification standard was realized.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 3
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Serum activities of liver enzymes in workers exposed to sub-TLV levels of dimethylformamide
Autorzy:
He, Jinjiang
Liu, Jie
Kong, Yulin
Yang, Weiwei
Zhang, Zengli
Powiązania:
https://bibliotekanauki.pl/articles/2177403.pdf
Data publikacji:
2015-03-27
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
dimethylformamide
workers
liver enzymes
TWA
sub-TLV
urine
Opis:
Objectives The aim of this study has been to investigate serum activities of liver enzymes in workers exposed to sub-TLV levels of dimethylformamide (DMF). Material and Methods Seventy-two workers and 72 healthy controls participated in the study. All subjects underwent complete physical examinations and abdominal ultrasound examination. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), and c-glutamyl transpeptidase (c-GT) were determined by an auto-chemistry analyzer. The data of airborne concentrations of DMF was obtained from the local Center of Disease Control and Prevention. The level of urine N-acetyl-S-(N-methylcarbamoyl)cysteine (AMCC) was measured by means of high-performance liquid chromatography. Results Time weighted average (TWA) concentration of the DMF in workplace was 18.6 (range: 9.8–36.2) mg/m³. The concentration of the AMCC in workers’ urine was 28.32 (range: 1.8–58.6) mg/l and 9 workers’ AMCC exceeded the biological exposure index (40 mg/l). Thirty-one workers reported gastrointestinal symptoms (abdominal pain, nausea, anorexia) and 10 workers reported headache, dizziness and/or palpitation in the exposed group. Serum analysis revealed that both the mean of serum activities of liver enzymes (ALT, AST and c-GT) and the percentage of workers with abnormal liver function were significantly higher in the exposed group as compared to the controls. Conclusions Dimethylformamide can cause liver damage even if air concentration is in the sub-threshold limit value (sub-TLV) level. The protection of skin contact against the exposure to the DMF might be a critical issue as far as the occupational health is concerned.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 2; 395-398
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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