Even when official data are not fiddled with, they are difficult to access.
Most of the NH sites are difficult to access due to the connected hydrogen bonds.
However, adjuvant formulation and manufacturing know-how are difficult to access.
Its USP is mapping inside buildings that may have been contaminated, or are difficult to access by other means.
Out-of-hours services, including NHS111, are difficult to access, increasingly privatised and not trusted by patients.
This is partly due to the fact that insulators are difficult to access with standard surface science techniques such as scanning tunneling microscopy.
Cellulose is an attractive feedstock for biofuel production because of its abundance, but the cellulose polymer is extremely stable and its constituent sugars are difficult to access.
Designing intervention methods to control chaotic behavior in dynamical systems remains a challenging problem, in particular for systems that are difficult to access or to measure.
However, most of these methods require a large number of labeled data which are difficult to access in many real applications.
While there is a general agreement on the physiological importance of these features, they remain poorly characterized, mainly because they are difficult to access with standard laboratory techniques.
Wide-ranging applications include those where beam steering optics are required to reach locations that are difficult to access but no attention has yet been given to measurement sensitivity to the vibration of those optics.
