The phrase "are frequently obtained" is correct and usable in written English.
It can be used when discussing the regular acquisition or retrieval of something, often in a scientific or technical context.
Example: "In this study, data samples are frequently obtained from various sources to ensure accuracy."
Alternatives: "are often acquired" or "are regularly collected".
Wind fields for such simulations are frequently obtained from numerical hindcasts with regional atmospheric models (RAMs).
False-negative reports are frequently obtained during late pregnancy when the secretion of chorionic gonadotropin normally decreases.
This makes possible to reduce the experimental effort and to avoid the inconclusive results that are frequently obtained from intuitive experimental plans.
The temperature dependent parameters have, however, little physical meaning and very odd results are frequently obtained when the interaction parameters obtained from excess enthalpy information alone are used for the prediction of vapor-liquid equilibria.
Blood, urine and cerebrospinal fluid (CSF) cultures are frequently obtained to evaluate for infection.
As a result, unconnected sets of point clouds for the same object are frequently obtained.
Further, expertise in effectively managing ethical dilemmas is frequently obtained via modeling after the attending physician.
An essential part of most cellphones is the mineral tantalite, which is frequently obtained from the Democratic Republic of Congo under murky circumstances.
This alcohol mixture is frequently obtained in semiconductor industry as a waste by-product, thus a detailed study of how to re-use this stream to produce high-value ester products is a worthy research.
Cold generated in the horticultural industry is frequently obtained by a system which works by applying a compression cycle of a refrigerant fluid; this methodology has provided until the present time a good price/efficiency ratio.
Both Dep and No Dep results were frequently obtained for recordings of AVCN units.
