However, it is not possible to validate the model output at this time, since no method to identify exclusively traffic-generated particles exists up to now.
However, up until now, no such method exists for tall guyed masts that can account for the dynamic cable mast interactions which dominate seismic effects in these structures.
To overcome this problem, several automatic delineation methods have been proposed [18 23], but up to the present, no general consensus about the best method exists.
He did it even though no proven method exists to respond to such a spill.
Theoretical concerns about this method exist.
No proven methods exist to clean up oil in broken ice.
A variety of methods exists for creating strong, cryptographically secure random passwords.
No proven methods exist to effectively clean up oil spilled in icy Arctic waters.
An important question remains as to whether other potentially less costly and/or more effective methods exist to reduce loss to follow-up.
The fact that so many methods exist by which people "connect" or "hook up" means that something like "cheating," which used to seem black and white, has to be constantly redefined.
