NLOS propagation also makes it difficult to model accurately the received signal power.
But the unreliable single-hop communication makes it difficult to model the delivery performance in opportunistic routing.
With these low initial solid fractions, the flow behavior of semi-solid slurries is quite complicated, making it difficult to model accurately.
Also, the lack of notion of interaction makes it difficult to model relationships among states of different systems (see the "... .. in Fig. 2).
These differences derive from the assumptions made during the simulation phase, making it difficult to model both the kinematic and the depositional parameters of the flow, which were the focus of our study.
Temperature is more challenging: there is a large range in PDC temperatures, and these temperatures can vary greatly even within a single PDC (Cole et al., 2015), which makes it difficult to model.
Although we conclude that source-control technologies have potential to mitigate the impact of urbanisation on baseflow hydrology, the complexity of subsurface flow processes makes it difficult to model the effects of the implementation of several stormwater management techniques on catchment baseflow.
Our results show that at best, this type of reporting detects a small proportion of real cases, and the range of the rate makes it difficult to model and extrapolate such figures from manual recording alone.
The presence of complex regulatory processes described above, and the abnormal differentiation programs adopted by keratinocytes in vitro [ 39– 41], make it difficult to test model predictions directly; however, transgenic mice with modified signaling components under inducible expression within the epidermis may be useful for testing such mechanisms [ 17, 61].
