Sentence examples for usually difficult to reach from inspiring English sources

With suitable and reversible operating conditions, the RGPP led to deposit tuneable titanium oxynitride coatings, usually difficult to reach by conventional reactive sputtering.

Despite the wide research about their performance, their hydraulic study and characterization has been so far limited to uniform hydraulic conditions which are usually difficult to reach in natural scenarios, either because inaccurate building or simply because the studied situations during the design of the prototypes are never encountered.

However, in most application scenarios, users are usually difficult to reach the location of sensor nodes.

However, resting viable tumour cells within necrotic areas are usually difficult to reach with immuno-targeting agents not only due to the lack of blood supply but also because of absent or low antigen concentration.

Unfortunately, perfect dose uniformity is usually difficult to achieve when treating samples with a complex shape.

But at the Museum of Life and Science in Durham, N.C., where Beck Tench has worked as the director for innovation and digital engagement since 2008, Twitter and Flickr helped the museum connect with a community of people -- adults interested in visiting a museum without children in tow -- that it usually finds difficult to reach.

That is Alabama, not England, although the two cities are almost equally difficult to reach, usually requiring a change of planes from New York City.

Undergraduates were notoriously difficult to reach in those days, their phones usually going unanswered or giving a busy signal.

The reports have usually stated that, due to the lack of adequate and accurate empirical data, it is difficult to reach firm conclusions on the extent to which health sector decentralisation reforms shape health system change and performance.

However, the reaction temperature for heavy oil thermal cracking is usually above 300 °C (Hyne et al. 1982; Clark et al. 1983 , 1984 , 1987Clark and Hyne 1984), which is very difficult to reach under reservoir conditions.

Which group was most difficult to reach?