The phrase "keep unaltered" is grammatically correct and can be used in written English.
It means to maintain something in its original state without making any changes or alterations to it. Example: "The historical building must be kept unaltered to preserve its authenticity and cultural significance."
Consequently, the sections corresponding to the bottom third of the vocal tract have been kept unaltered.
In those cases, the correction is performed (the onset is added) but the threshold value is kept unaltered.
Often only some of the components of a system are to be optimized and the designs of the rest of the components have to be kept unaltered.
Variations in the sucrose (100 800 g/l) or enzyme (1.5 15 units per gram of substrate) concentrations kept unaltered the product profile.
Random mutations were simultaneously introduced into the nonadjacent rbcL and rbcS genes whereas the middle T7-rbcX sequence was kept unaltered.
Therefore, the original chrominance contributions are kept unaltered, while the luminance of the resulting image allows to blindly recover the embedded information.
Therefore, similar to type I and III nanoclusters, the formation of type II nanocluster is obviously related to two displaced Si edge adatoms in the FHUC and the other one Si edge adatom is almost kept unaltered.
The idea is that, while the local maximum condition is kept unaltered, threshold θ now becomes a function θ≡θ(t) whose value is defined according to one of the interactive policies to be explained.
Each engine, together with its continuously varying control system, is operated at the lower level under the supervision of a local discrete-event controller for condition monitoring and life extension; the gain-scheduled feedback controller that is used to maintain the specified performance of the turbofan engine is kept unaltered.
Since one displaced Si edge adatom in the FHUC would induce the depression of the closet Si edge adatom in neighboring UHUC in the filled-state STM image, the formation of type I nanocluster is obviously relative to one displaced Si edge adatom in the FHUC and the other two Si edge adatoms are almost kept unaltered.
