However, supercritical carbon dioxide has different compressibility and thermal properties from water and ideal gas, which bring difficulties to flow field analysis.
Main-chain/side-chain combined liquid crystalline polymers (MCSCLCPs) are usually difficult to synthesize and their degrees of polymerization are relatively low, which bring difficulties in studying their structure property relationships.
The abutments are divided by major faults and intercalations into several potential sliding wedges, which bring difficulties and threats to the construction of the dam and the operation of the reservoir.
A high degree of accuracy during assembly is required which brings difficulty into the manufacturing cycle.
Under the superlinear conditions (1.5), there is no twist condition for, which brings difficulty to the study of the existence of periodic solutions of (1.4).
Binary P-T-X (pressure temperature composition) and multi-component phase diagrams are of complex spatial geometry, which brings difficulty for understanding.
The closed-loop serial compliant mechanism is over- constrained because its two fixed ends produce more than three unknown reaction forces, which brings difficulty in obtaining its compliance model.
Unfortunately, such decomposition is mathematically non-unique, which brings difficulties to interpretation, and requires some physical constraint.
Though the mobility of multimedia sensor node provides the advantage, the network topology becomes dynamic, which brings difficulties in both the data communication and data management.
Therefore, it is hard to synthesize aligned few-walled CNTs on a non-planar surface [11], which brings difficulties in constructing multi-stage aligned CNTs on non-planar substrates.
