The phrase "are maintained within" is correct and usable in written English.
It can be used when discussing the preservation or upkeep of something inside a particular context or framework.
Example: "The standards of quality are maintained within the guidelines set by the organization."
Alternatives: "are kept within" or "are preserved within".
An elevator and rudder are maintained within the propeller slipstream for additional control.
They show that the conservation of species demands a geographic, even global, perspective on how interactions between species are maintained within biological communities.
Therefore, in people with normal parathyroid glands, serum calcium concentrations are maintained within a very narrow range even in the presence of large changes in calcium intake or excessive losses of calcium from the body.
Unless the concentrations of mineral ions such as sodium, crystalloids such as glucose, and wastes such as urea are maintained within narrow normal limits, bodily malfunction rapidly develops leading to sickness or death.
The room temperatures are maintained within the desired range (subplot 1, Fig. 16).
After on-orbit checkout, the spacecraft separate and are maintained within a range of 50 1000 m.
To facilitate these methods the pairwise distances between the objects of a node are maintained within each node.
In the third section, the CPs may change in a block-by-block manner; however, their states are maintained within a block.
Most companies include temperature and humidity monitoring devices to ensure that drug products are maintained within the acceptable range during shipping and distribution.
However, the reversible change of the two-phase equilibrium with temperature is possible, if the phase fractions are maintained within a range (1/2, 2/3).
The horizontal storage module must ensure that the temperatures of the spent nuclear fuel assemblies are maintained within the allowable values for normal, off-normal, and accident conditions.
