Finding adequate non-user matches for these patients was difficult, as ideal controls should have the same distribution of characteristics to enable the estimation of unbiased risk.
Funerals are difficult even under ideal circumstances, and those confronting the Cutolos are anything but ideal.
While those conditions have made the task of seeing what is there particularly difficult, they were ideal for ensuring that the more than 30,000 volumes, ranging from scientific and medical literature to architecture and music, have stayed in pristine condition for centuries.
However, in practical scenarios, it may be difficult to do ideal camera motion by novice people.
It is difficult to obtain ideal characteristics in a single compost for all the crops (Do and Scherer 2013).
Additionally, the emerging requirements on both security and real-time make it much more difficult to produce ideal solutions.
To have similar effects without using the selective emitter method, a barrier material can be introduced between the Ag and Si since it is difficult to get ideal ohmic contacts with an n-type silicon substrate doped with phosphorus.
The current systemic administration of anticancer agents is difficult to achieve ideal therapeutic dose to suppress tumor growth at bone marrow diseased sites, and is always associated with a high incidence of relapse and severe side effects.
Settings should avoid imperfections or over compaction that would make resin infusion difficult, and produce ideal yarn architectures suited to the geometry and applied loadings to be carried by the final composite part.
However, because of extensive modification of the landscape to suit human use, strategies for achieving regional population targets for forest bird species would be difficult under even ideal circumstances, and even more so if maintenance of grassland bird populations is also desired.
