Development of a Submillimetric GNSS-Based Distance Meter for Length Metrology.

Absolute distance determination in the open air with an uncertainty of a few tenths of a millimetre is increasingly required in many applications that involve high precision geodetic metrology. No matter the technique used to measure, the resulting distances must be proven consistent with the unit of length (SI-metre) as realized in the outdoor facilities traditionally used in length metrology, which are also known as calibration baselines of reference. The current calibration baselines of reference have distances in the range of 10 to 1000 m, but at present there is no solution on the market to provide distances with submillimetric precision in that range.

[Reactive arthritis due to Clostridium difficile: Report of two cases and literature review].

Introduction: Reactive arthritis due to Clostridium difficile infection is uncommon.

Case Reports: We report two cases of reactive arthritis associated with C. difficile infection that occurred in a 40-year-old woman and a 47-year-old man.