Sentence examples for concentration is difficult from inspiring English sources

With this method a quantitative analysis of the para-H2 concentration is difficult, however qualitatively we could see that the concentration was much higher than the equilibrium concentration at liquid nitrogen temperature (77 K).

Since the on-line measuring of ionic free surfactant concentration is difficult, conductivity which is related to it is measured instead and used for control purposes.

It is shown that whilst the formation of coated electrode at relatively low concentration is difficult in dry medium, it became possible in the presence of an excess amount of water.

Although precise quantification of the radical concentration is difficult, a first estimate shows that there is a significant number (of the order of 4 × 1013 spins) compared with the total number of polymer chains (1014) that run through the cross-section of the PE rope employed in the experiments.

However, exact source concentration is difficult to calculate, and the printing and assembly of the phantom is time consuming.

However, a disadvantage of the one-step method is that preparation conditions influence the size, shape and concentration of nanoparticles, the range of particle size distribution is broad, and an accurate control of the concentration is difficult.

"You don't stop improving, but thought and concentration are difficult when you're part of an orchestral jukebox.

"Concentration" was difficult when he could make 10 times more money singing and acting in popular shows.

Furthermore, odors must be tested across concentrations, since the roles of odor receptors at each odor concentration are difficult to predict from odor response profiles alone.

However, the absolute values of extracellular metabolite levels were not reported, and percentage changes in concentration are difficult to interpret because fluxes through the extracellular glucose and lactate pools are likely to be very different, as discussed above.

The behavior of composite laminates subject to notch based stress concentrations is difficult to apprehend, especially the mechanisms of damage progression leading to total failure.