The phrase "and hence need" is correct and usable in written English.
It can be used to indicate a conclusion or result that follows logically from a previous statement, particularly when discussing requirements or necessities.
Example: "The project is behind schedule, and hence need for additional resources has arisen."
Alternatives: "and therefore require" or "and thus necessitate".
These experiments face a low count rate and hence need highly optimized detector concepts.
It is the employees together who form the intellectual capital and, hence, need to be recognized as the most valuable resource for any organization.
Most mobile robot systems accrue an odometry error while moving, and hence need to use external sensors to recalibrate their position on an ongoing basis.
Par-3 layouts are not usually sanctioned by the United States Golf Association and hence need not adhere to particular rules.
The conventional primary and secondary water treatment plants do not remove or degrade these toxic pollutants efficiently and hence need cost effective tertiary treatment method.
This model is used to conduct a sensitivity analysis to assess which properties and process parameters are most influential and hence need to be determined most accurately.
Progressive deterioration in the mechanical properties with increasing service period is commonly observed and hence needs to be addressed.
This implies that the flow needs more time to feel the presence of the driving force and hence needs more time to attain steady-state behavior.
Notably, the legislation applied to works of art that had already been created and hence needed no further incentive to come into being.
However, the COP is lower with respect to absorption refrigeration and hence needs substantial improvement through detailed thermodynamic and CFD design optimization.
The presence of residual porosity can strongly influence dynamic material response and hence needs to be accounted for in bulk (average) constitutive models of these materials.
