Measurements of Humidity Standards at UME (Turkey) and at IMGC-CNR (Italy). A Bilateral Comparison

A bilateral comparison between UME and IMGC was carried out in the field of humidity from 30C to 60C dew/frost point temperatures. Two circulating chilled-mirror dew point transfer standards are measured, both in terms of the DC analog output and the Pt-100 mirror PRT reading, and the result of the comparison has been evaluated in terms of these two quantities. The agreement between the results of the measurement at UME and those obtained at IMGC-CNR in the common dew/frost point temperature range -30 °C to 60 °C is found to be within the comparison uncertainty. The detailed analysis of the results and the uncertainty budget related to the measurements is presented in this work

Effects of L-thyroxine treatment on heart functions in infants with congenital hypothyroidism.

AbstractBackground:Impaired heart functions in newborns with hypothyroidism should be reversed by levothyroxine substitution therapy. The aim of the study was to investigate heart functions with congenital hypothroidism (CH) in newborns and changes after levothyroxine substitution therapy, measured with tissue Doppler echocardiography and conventional echocardiography.Methods:The study included 30 neonates with CH and 34 healthy controls. Echocardiography were performed at baseline, 2nd week and 6th month of therapy.Results:Heart systolic function was normal. Mitral E velocities and mitral E/A ratios were significantly lower in patients at baseline. Tei indices were significantly higher in patients and a significant negative correlation was detected between free thyroxine levels and Tei indices.When early and late post-treatment echocardiography findings are compared, a non-significant difference was detected.Conclusions:Neonates with CH may exhibit systolic and diastolic heart dysfunction, which can be reversed by early L-T4 substitution treatment. The Tei index index should be measured in addition to conventional echocardiography.</jats:sec

Investigation of the Equivalence of the National Dew-Point Temperature Realizations in the Range -50 °C TO +20 °C

In the field of humidity quantities, the first CIPM key comparison, CCT-K6 is at its end. The corresponding European regional key comparison, EUROMET.T-K6, was completed in early 2008, about 4 years after the starting initial measurements in the project. In total, 24 NMIs from different countries took part in the comparison. This number includes 22 EURAMET countries, and Russia and South Africa. The comparison covered the dew-point temperature range from -50 °C to +20 °C. It was carried out in three parallel loops, each with two chilled mirror hygrometers as transfer standards in each loop. The comparison scheme was designed to ensure high quality results with evenly spread workload for the participants. It is shown that the standard uncertainty due to the long-term instability was smaller than 0.008 °C in all loops. The standard uncertainties due to links between the loops were found to be smaller than 0.025 °C at -50 °C and 0.010 °C elsewhere. Conclusions on the equivalence of the dew-point temperature standards are drawn on the basis of calculated bilateral degrees of equivalence and deviations from the EURAMET comparison reference values (ERV). Taking into account 16 different primary dew-point realizations and 8 secondary realizations, the results demonstrate the equivalence of a large number of laboratories at an uncertainty level that is better than achieved in other multilateral comparisons so far in the humidity field

EURAMET.T-K7 Key Comparison of Water Triple-Point Cells

The results of a EURAMET key comparison of water triple-point cells (EURAMET.T-K7) are reported. The equipment used, the measuring conditions applied, and the procedures adopted for the water triple-point measurement at the participating laboratories are synthetically presented. The definitions of the national reference for the water triple-point temperature adopted by each laboratory are disclosed. The multiplicity of degrees of equivalence arising for the linking laboratories with respect to the “mother” comparison CCT-K7 is discussed in detail