Sentence examples for are difficult to increase from inspiring English sources

The use of such signals in aggressive contexts that are close to performance limits of sound production have recently been described in swamp sparrows (Melospiza georgiana), although they face another kind of performance limit: They increase both trill rate and frequency bandwidth in aggressive contexts, two acoustic parameters that are difficult to increase simultaneously (DuBois et al. 2009).

He complained that it will be difficult to increase "flag sensitivity".

Investment spending has a long planning cycle, and is difficult to increase quickly.

'It will be difficult to increase consumption because young people aren't interested in eating whale meat,' said Nanami Kurasawa, director-general of the Dolphin and Whale Action network.

"As long as the wages are so low, it will be difficult to increase consumption," said Hans-Jorg Bullinger, the president of Fraunhofer-Gesellschaft, a big German contract research company.

This is because once full electrical conductivity is established; it is difficult to increase it.

Beyond this 200 m spacing, it is difficult to increase production, even if the reservoir pressure is significantly increased.

Moreover, it was difficult to increase the concentration of the nitride phase in the coatings by controlling spraying conditions such as N2 flow rate and RF power.

Furthermore, with an issue of poor surface integrity due to machining, it is difficult to increase alumina as scatterers more than a specific mass fraction ratio.

It is difficult to increase the sample sizes for such single center studies owing to the fact that very few patients elect to have IZ mini-implants and relatively few number of orthodontists place the IZ mini-implants.

Polymer composites are a candidate for low temperature fabrication technology, but it is difficult to increase the ceramic content, which offers superior dielectric and thermal properties at levels above 60 vol.% [10 12].