"changes in characteristics" is a correct and usable phrase in written English.
It can be used whenever you want to describe how something has changed or evolved in terms of its characteristics or qualities. Example: "The study aimed to examine the changes in characteristics of the local bald eagle population over the past decade."
This was also done to avoid unpredictable changes in characteristics as per the standard procedure (APHA 1995).
All the technicalities were ensured to avoid unpredictable changes in characteristics as per standard procedures (APHA 2005).
At this stage, the main objective was to study the changes in characteristics of the biosensors upon addition of clinoptilolite to their bioselective elements.
In the case of occurrence of the phase transformations in thin ribbons of metastable alloys, the inhomogeneity of their structural state can cause substantial changes in characteristics of the transformations.
Two main mechanisms are interpreted, i.e. the turbulence augmentation and the formation of weaker velocity regions which both contribute to the changes in characteristics of particle tube collision but act in independent ways.
The changes in characteristics suggested that the PC samples produced at high activation temperature (500 700 °C) were well carbonized and exhibited a high surface area (>270 m2/g).
Information about the location of coke was obtained from changes in characteristic diffusion time and adsorption capacity with coke content.
The samples were taken using acid-washed plastic container to avoid unpredictable changes in characteristic as per standard procedures (APHA 1995).
Changes in characteristic diffusion time were found to depend on both coking level and coke location, which influenced either the diffusivity or the diffusion path.
Since this technique only applies some changes in characteristic curves of the back-up relays, lack of programmable relay or adaptive protection requirements cannot decrease its performance.
The spectrum of spontaneous otoacoustic emissions changes in characteristic ways when an ear receives an external stimulus tone.
