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Czynniki materiałowe w badaniach penetracyjnych – czas wywoływania

Irek P.

Przegląd Spawalnictwa

2016

R. 88, nr 2

41--45

W artykule przedstawiono wyniki badań wpływu rodzaju materiału, chropowatości powierzchni w miejscu niezgodności oraz szerokości niezgodności na czas wywoływania w badaniach penetracyjnych. Wynikiem jest funkcja, która omawia w jakim stopniu poszczególny czynnik materiałowy wpływa na czas wywoływania. Oprócz wyników na blachach modelowych przedstawiono także wyniki z badań praktycznych pęknięć naturalnych.

In the paper it has been presented the results of investigations into the influence of the material kind, surface roughness in the imperfection place and the imperfection width on the development time in liquidpenetrant testing. The investigations result is the function which describes how far the individual material factor affects the development time. Apart from the results obtained on model sheets it has been given also the results of practical testing of natural cracks.

Long-term changes in the total development time of Copepoda species occurring in large numbers in the Southern Baltic Sea : numerical calculations

Figiela M., Musialik-Koszarowska M., Nowicki A., Lemieszek A., Kalarus M., Druet C.

Oceanological and Hydrobiological Studies

2016

Vol. 45, No. 1

1--10

The study presents changes in the total development time of Copepoda species, i.e. Pseudocalanus sp., Temora longicornis and Acartia spp. occurring in large numbers in the Southern Baltic Sea. The following factors were taken into account: temperature, salinity and concentration of food. The presented research involved simulations with greenhouse gas emissions scenarios A1B and B1. The analysis was performed for naupliar and copepodid stages combined together, and the results present the total development time of organisms from the naupliar stage to the adult form. The calculations were carried out using numerical methods based on the experimental data available in the literature.

Development and growth of Temora longicornis: numerical simulations using laboratory culture data

Dzierzbicka-Głowacka L., Lemieszek A., Żmijewska I.M.

Oceanologia

2011

No. 53 (1)

137-161

Quantitative expressions are presented to describe the effects of temperature and food concentration on stage duration and growth rate of Temora longicornis for each of the model stage groups (N1-N6 - naupliar stages, C1, C2, C3, C4, C5 - the five copepodid stages). The calculations were made on the basis of experimental data from the literature for Temora longicornis from the south-eastern and the southern North Sea. Relationships were obtained between the growth parameters and temperature for the 5-10°C temperature range and food concentrations from 25 mgC m-3 to excess. Also computed was the total mean development time as a function of the above-mentioned parameters, temperature and food availability. The simulations computed here are similar to the experimental results. The growth rates for successive stages were obtained according to the correction of the "Moult Rate" method, which allows the use of mean weights and stage durations. The calculations also suggest that three complete generations of T. longicornis from the Gdańsk Deep (the southern Baltic Sea) can develop during a single year.