Metodyka pomiarów wielofunkcyjnych w monitorowaniu strefy skrawania z wykorzystaniem zjawisk dynamicznych w procesie toczenia nadstopów z zastosowaniem termowizji i szybkiego skanowania

Processes in a cutting zone are so complicated and dynamic, that their description is performed by specifically created models. As the models have faults and deviations, it is necessary to improve them so that these deviations become as little as possible or completely abolished and focus on the area of micro-cutting. Examining new ways should be based on the previous research and it is necessary to know the details of the contemporary knowledge. In examining the cutting zone one could widely use nondestructive methods (such as thermovision and high-speed scanning).Procesy zachodzące w strefie skrawania cechują się dużą dynamiką i złożonością. Stąd są najczęściej definiowane za pomocą specjalnie tworzonych modeli. Jednak same modele z reguły mają usterki i uproszczenia. Z tego względu więc niezbędna jest korekta modeli, dla zmniejszenia skali błędów lub ich całkowitego wyeliminowania. W trakcie poszukiwania nowych metod w opracowaniu modeli należy stosować współczesne możliwości badawcze strefy. Obecnie charakteryzacja strefy skrawania jest prowadzona za pomocą metod nieniszczących, m.in. termowizji i szybkiego skanowania

Determination of Metal Concentrations in Sediments of Big Walnut Creek

The freshwater mussel populations in the lower stretch of Big Walnut Creek in central Ohio have been found to vary along the run of the creek with the lowest population of mussels in the middle stretch. One possible cause for the decline is the presence of contaminants in the sediments of the creek. In this study, nine Sites along the creek were examined. At each Site, sediment samples from a pool region and two quadrants from where mussels were also studied (the area of interest) were collected, along with pseudo feces, which is the waste mussels produce as they filter water and sediment to find food. The concentrations of select metals in the sediments and pseudo feces were determined using acid extraction and analysis with microwave plasma-atomic emission spectroscopy. The concentrations of metals were found to vary along the creek, most notably in the cases of lead, zinc, calcium, and manganese. However, only calcium and zinc were found to be significantly correlated to the mussel populations. The concentration of calcium was found to positively correlate to mussel populations (r = 0.715, p = 0.03), while zinc was found to negatively correlate to mussel populations (r = -0.717, p = 0.03). Additionally, the metal levels in the area of interest were compared to those collected in the year 2000, and the overall quality of the sediments improved over the past two decades with only four occasions where a sampleexceeds the threshold effect concentration out of 45 total samples