Papers by Keyword: Growth Rates

Abstract: An experimental study using microalgae Scenedesmus sp. growth rates are conducted in varies of environmental conditions that aim to access the growth rates yields of microalgae Scenedesmus sp. tolerance and capability sustain in fluctuations condition of wastewater may permit. Synthetic aqueous of Basal Bold Medium (BBM) was used to cultivate in batch mode using reactor flask under different abiotic parameters such as pH, temperature, lux intensity and photo period. These conditions are chosen due to its influential key on microalgae growth yields, metabolism and nature of environmental where microalgae utilization took place. The initial concentrations of microalgae are kept constant at initials of 1000cells/ml as per APHA (2012) standards and other environmental factors are varies based on the nature of selected wastewater and surrounding nature. The maximum yields of Scenedesmus sp. specific growth rates subjected to abiotic conditions are pH range from pH7 to pH8, temperature is 25°C to 30°C, photoperiod is 12/12 (Light/Dark)(hr) and lux intensity of 4000. Significant of these findings shows microalgae Scenedesmus sp. can easily grow and adapt well in fluctuating of nature conditions as the optimums are precisely close to nature conditions.

Abstract: The platelike bainitic ferrite growth rates were calculated by two modified diffusional models. Good agreements between experimental and theoretical results are found in Fe-0.59C wt.%, Fe-0.81C wt.% and Fe-0.478C-4.87Ni wt.% alloys. A slowing down effect due to the alloying element Mo is emphasized in Fe-0.69C-1.8Ni-0.8Mo wt.% alloy. However, the experimental data are lower than theoretical ones about two orders in Fe-C-8.7Ni wt.% alloys. According to the discussion of the results, it is suggested that the bainite transformation mechanism may relates to steel composition and transformation temperature.

Abstract: New 3D X-ray diffraction microscopy (3DXRD) experiments on recrystallizing bulk grains that nucleated and grew in a 92% cold deformed pure copper during in situ annealing at both 150° C and 160° C are described. Nucleation times, growth velocities and apparent activation energies were determined for each grain. A wide range of apparent activation energies was observed but the average of 123 kJ/mol agreed well with earlier recrystallization experiments on a similar purity copper. It was clear that each recrystallized grain had its own individual characteristics; the grains do not all behave alike as various models would suppose.

Abstract: Possible variations in recrystallization kinetics from the sample surface to the center have been investigated in 90% homogeneously cold rolled aluminium (AA1050). It was found that whereas the average growth rates are quite similar, the nucleation characteristics are different at the surface and in the bulk.