"stiff constraints" is a correct and usable phrase in written English.
You can use it when you want to talk about something that limits the ability to do something or limits flexibility. For example, "The tight budget and stiff constraints placed on us by our superiors made it difficult for us to complete the project on time."
For nanosystems such as nanowires and nanograins embedded in a stiff matrix, the geometric constraints and boundary conditions have an impact on martensite formation, leading to new microstructures – such as dots aligned on a square lattice with axes along ⟨01⟩ – or preventing martensite formation altogether.
Here, α controls the "tightness" of the penalty: a larger α places a stiffer penalty on constraint violation at the expense of a larger steady-state convergence error.
When explicit time discretization schemes are applied to stiff reaction diffusion equations, the stability constraint on the time step depends on two terms: the diffusion and the reaction.
The vibration behaviour of this beam subjected to moving loads is analyzed by Hamilton's principle with the intermediate point constraints represented by very stiff linear springs.
Through numerical examples, the obtained sensitivity is verified in terms of accuracy and efficiency compared with finite difference sensitivity and further applied to the shape optimization problem of finding a stiff structure while satisfying a volume constraint.
High order spatial derivatives and stiff reactions often introduce severe temporal stability constraints on the time step in numerical methods.
The computational efficiency is further enhanced by splitting time steps established beyond standard stability constraints associated to mesh size or stiff source time scales.
The first is the initial injection parameters that result in unpredictable AuNR distributions dictated by pressure gradients and matrix constraints that exist within these very stiff tumors.
To accelerate the numerical integration, a "longitudinal constraint" is suggested to alleviate the stiff problem of the dynamic equations.
The contention came later as Ian Holloway, Millwall's manager, stiff as an undertaker in long, black coat, condemned the constraints on the club's fans with regard to this fixture.
