Sentence examples for samples is difficult from inspiring English sources

In addition, providing good-quality core samples is difficult especially in highly fractured and weathered rocks.

A trace element composition of rock samples is difficult to determine when they contain refractory minerals that are hardly dissolved with conventional acid digestion techniques.

The direct determination of toxic metal ions, in environmental samples, is difficult because of the latter's presence in trace concentration in association with complex matrices, thereby leading to insufficient sensitivity and selectivity of the methods used.

It's in the absence of interest that we have a deadline to dispose of them and at the moment we've got pretty limited interest, which in itself is interesting because of course we're always being told there aren't enough samples, or we're being told access to samples is difficult and you know as you'll see from that leaflet we've been pretty open about we've got them, 'come and get them' you know.

The samples obtained from museum collections were used to represent geographic areas where harpy eagles have been extirpated (e.g., Mexico) or from countries where the current export of tissue samples is difficult (e.g., Brazil).

Thus comparing two independently clustered samples is difficult.

Sometimes, depending on the consistency of the sediment, the core samples are difficult to obtain.

However, her team faced a problem: collecting samples was difficult.

Dr. Nichol said that he would like to see more testing, but added that he believed the group's findings, and acknowledged that obtaining samples was difficult and dangerous work.

When pile samples were difficult to collect, samples of the foundation threads were collected instead.

In many classification cases, the labeled samples are difficult to acquire.