Sentence examples for are difficult to attain from inspiring English sources

In fact ηa is shown to be limiting, such that values over ηa > 50% are difficult to attain.

While these regions are theoretically attractive for multi-stage snap-morphing, they are difficult to attain in practice by means of a single control parameter.

However, the associated complex pattern requirements are difficult to attain with traditional solution-based methods, barring significant concessions to device performance and process scalability.

It warned: "Sexualised ideals of young, thin, beauty lead to ideals of bodily perfection that are difficult to attain, even for the models, which perpetuates the industry practice of "airbrushing" photographs.

Recreating fossil receptors for functional studies in the laboratory can provide important insights into the constraints that shaped molecular structure and function in this diverse superfamily that are difficult to attain by using more traditional mutagenesis methods.

During the summer, ferry reservations are difficult to attain.

This equilibrium is difficult to attain and even more difficult to change.

But he conceded it would be difficult to attain that goal.

An empirically grounded, universally valid judgment on the impact of e-cigarettes may be difficult to attain.

Due to the relatively thin concrete panel thickness, it is difficult to attain adequate ductility in connection system.

The large number of families needed in discovering genetic variants with modest effect sizes is difficult to attain.