LTRFLoudoun Therapeutic Riding Foundation (est. 1974; Leesburg, VA)
LTRFLong Term Research Fellowship (European Respiratory Society)
LTRFLevel Temporal Receptive Field
References in periodicals archive ?
The LTRF was designed to calibrate in-house "reference-standard" resistance thermometers consisting of selected CSPRTs and RIRTs for NIST only.
The LTRF has been used also for studies of the scale, in particular the non-uniqueness of the ITS-90 (13) over the ranges of definition overlap.
After NIST realized the ITS-90 below 24K in 1996, it has calibrated customer thermometers using reference RIRTs that have been calibrated in its LTRF.