منابع مشابه
Accuracy and comparability of long-term measurements of cholesterol.
Laboratories of the Lipid Research Clinics Program (LRC) maintained the accuracy of their measurements of total cholesterol by using seven pooled serum calibrators supplied by the Centers for Disease Control (CDC). Over the 11-year life of the LRC, each calibrator was prepared in succession and a target value was assigned by the CDC reference method for cholesterol. The results of a special exp...
متن کاملUpconversion-based lidar measurements of atmospheric CO2.
For the first time an upconversion based detection scheme is demonstrated for lidar measurements of atmospheric CO2-concentrations, with a hard target at a range of 3 km and atmospheric backscatter from a range of ~450 m. The pulsed signals at 1572 nm are upconverted to 635 nm, and detected by a photomultiplier tube, to test how the upconversion technology performs in a long range detection sys...
متن کاملComparability of retinal nerve fiber layer thickness measurements of optical coherence tomography instruments.
PURPOSE To compare retinal nerve fiber layer (RNFL) measurements between two ocular coherence tomography (OCT) instruments (OCT 2000 and Stratus OCT; Carl Zeiss Meditec, Dublin, CA) and compare their diagnostic precision. METHODS One hundred thirty-nine consecutive subjects were imaged (3 x 3.4-mm diameter circular scans) on the same day with each instrument. Thirty-five patients were exclude...
متن کاملSurface layer CO2 budget and advective contributions to measurements of net ecosystem–atmosphere exchange of CO2
The aim of this case study is to examine the surface layer CO2 budget and possible impacts of advection on the 20 km scale on estimates of net ecosystem–atmosphere exchange (NEE) of CO2 under windy conditions. The advection terms in the CO2 mixing ratio conservation equation are computed using data from two flux towers 20 km apart in a forested area in Wisconsin, USA. The data are analyzed when...
متن کاملApplied Optics Photoacoustic Measurements of the Co2 Absorption Coefficients within Infrared Region of Co2 Laser Spectrum
Absorption coefficients of the carbon dioxide (CO2) were measured at atmospheric pressure and room temperature by photoacoustic technique with a cw, line-tunable, frequency stabilized CO2 laser. The CO2 laser spectrum of our system consists in 53 lines with wavelengths ranging from 9.2 μm to 10.8 μm and power levels below 5 W. Measured values of the CO2 absorption coefficients are typically of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Tellus
سال: 1977
ISSN: 0040-2826,2153-3490
DOI: 10.3402/tellusa.v29i5.11376