We report the results of an effort to measure the low-frequency portion of the spectrum of the cosmic microwave background (CMB) radiation, using a balloon-borne instrument called the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE). These measurements are to search for deviations from a thermal spectrum that are expected to exist in the CMB as a result of various ...

Abstract The Atacama Large Millimeter/submillimeter Array can achieve unprecedented spatial resolutions of 15 to 5 mas with the longest baselines 16 km and observing at highest frequencies 275–950 GHz (1.09–0.30 mm). Two conditions are paramount for successful observations these frequencies: a phase calibrator in close proximity science target stable-enough atmosphere provide low residual rms p...

One of the large industrial needs is use sound level meter (SLM) especially in noise monitoring even occupational and/or environmental, calibration this measuring device essential during last decades. The coupler approach regarded as most practical to apply SLM calibrating techniques required by standard IEC 61672. In method some tests have be accomplished judge measurement results. performed w...

The Beam-Position Monitors (BPM) for the PEP-II B Factory consist of four 1.5cm diameter button style pickups mounted on the diagonals of the quadrupole vacuum chambers. Before installation of the vacuum chambers in the quadrupole assemblies, the electrical center of the BPMs is measured with respect to the mechanical center in a calibration test stand. In this paper the calibrations test stand...

We present a new analysis of the main empirical calibrators of oxygen abundance for ionised gas nebulae. With that aim we have compiled an extensive sample of objects with emission line data including the near IR [SIII] lines and the weak auroral lines which allow for the determination of the gas electron temperature. For all the objects the oxygen abundances have been derived in a homogeneus w...

Introduction: Nuclear accidents release large quantities of radioactive materials into the environment. Iodine-131 and cesium-137 are two radionuclides released during nuclear accident, which can pose the greatest cancer risks. These radionuclides can be moved to other areas through rain and wind. The aim of this study was to develop efficient and economical biological...

Abstract COSMO is a ground-based instrument to measure the spectral distortions (SD) of Cosmic Microwave Background (CMB). In this paper, we present preliminary results electromagnetic simulations its reference blackbody calibrator. HFSS provide calibrator reflection coefficient $$R\sim 10^{-6}$$ R ∼</...