The phrase "are constrained on" is not correct in standard written English.
It is typically used to describe limitations or restrictions placed on something, but the preposition "on" is not the appropriate choice in this context.
Example: "The researchers are constrained by the available data."
Alternatives: "are limited by" or "are restricted to".
But remember we are constrained on iPhone 4. Q: Can you give updated thoughts on the Mac side?
Thus, researchers in virtual reality are constrained on choosing appropriate evaluation method when 3D gaze tracking has to be performed in virtual space.
In the design example, the nodes are constrained on an ellipsoidal surface, where movements in the normal directions of the surface are fixed, whereas movements in the tangent planes are free.
In the context of applications where the positions are constrained on a grid, a novel tracking strategy is proposed to determine the real position and obtain the actual parameters in the monitored region.
The latter, however, are more reliable since they are constrained on a global scale and calibrated to the ATNTS2012 (Wade et al., 2011; Hilgen et al., 2012).
In particular, a gamma distribution was used to represent the uncertainty in costs, because costs are constrained on the interval zero to positive infinity and are often highly skewed.
All the information considered necessary for the ATA to perform their very demanding duties was constrained on one side of an ordinary postcard "filed" on a couple of ordinary key rings!
The team also recognized the challenges of mounting a large primary data collection exercise that is constrained on the one hand by epidemiology and logistics and on the other hand by dependency on countries for data that may not be forthcoming within the required timeline.
Gary Gibbon on his Channel 4 blog says David Cameron is constrained on Syria because he knows he would lose a Commons vote on arming the opposition.
Ukip has attempted to improve its vetting of candidates in the local and European elections to be held next month, but it appears that some of their members will not be constrained on social media.
On the contrary, our method is constrained on local area and can be applied for on-line retrieval.
