The phrase "are improved at" is correct and usable in written English.
It can be used to indicate that someone has become better at a particular skill or activity over time.
Example: "Students are improved at mathematics when they receive regular tutoring and practice."
Alternatives: "have become better at" or "are more skilled in".
The ultimate tensile strength and ductility are improved at Co 30 35 at%, especially the ductility, compared to the equal molar CoCrFeNi HEAs.
A careful assessment of every residence run by New York State is needed so that those not providing proper services are improved at once and those providing good care are recognized.
This work provides confirmation that self-humidifying properties are improved at temperature above 60 °C through a combinational inclusion of G c) and PWA within SPEEK and the new self-humidifying membranes have potential for use in medium temperature direct methanol fuel cells.
The parameters modeled as being constant in time, e.g., what is normally the case for station and radio source coordinates, are improved at every epoch and thus the estimates at the last epochs are the final estimates of these parameters.
It can be obtained in Fig. 6 that the coverage probability and average rate of pico edge users are improved at the expense of the performance degradation of macro interior users.
The remaining installations consist of single machines; Average short-circuit power levels are improved at all system bus-bars considered with respect to the system scenario with no synchronous condensers installed.
The phones themselves are improving at a cracking pace.
Test scores are improving at many of its schools in Philadelphia and elsewhere.
Meanwhile, Ariba's results are improving, at least in terms of profitability.
Martínez's team have momentum and are improving at a critical moment.
Things are improving: At the height of the power outage, nearly half the region was dark.
