The accuracy of the atmospheric mass density is one most important factors affecting orbital precision spacecraft at low Earth orbits (LEO). Although there are a number empirical models available to use in orbit determination and prediction LEO spacecraft, all them suffer from errors various degrees. A practical way reduce error particular model calibrate using precise data or tracking data. In...

We use the COMPLETE Survey’s observations of the Perseus star-forming region to assess and intercompare three methods for measuring column density in molecular clouds: near-infrared extinction mapping; thermal emission mapping in the far-IR; and mapping the intensity of CO isotopologues. Overall, the structures shown by all three tracers are morphologically similar, but important differences ex...

Colposcopy is a primary diagnostic method used to detect cancer and precancerous lesions of the uterine cervix. During the examination, the metaplastic and abnormal tissues exhibit different degrees of whiteness (acetowhitening effect) after applying a 3%-5% acetic acid solution. Colposcopists evaluate the color and density of the acetowhite tissue to assess the severity of lesions for the purp...

BACKGROUND Covariate measurement error is common in epidemiologic studies. Current methods for correcting measurement error with information from external calibration samples are insufficient to provide valid adjusted inferences. We consider the problem of estimating the regression of an outcome Y on covariates X and Z, where Y and Z are observed, X is unobserved, but a variable W that measures...

The principles of the calibration of a time projection chamber with radioactive Krypton83 are explained. The calculation of gain correction factors and the methods of obtaining a precise energy calibration are illustrated. The properties and advantages of Kr are summarized and compared to other radioactive calibration sources. It was shown that the Krypton calibration for the STAR FTPC is feasi...

We consider the problem of locating and orienting a network of unattended sensors that has been deployed in a scene with unknown sensor locations and orientation angles, when no “anchor” nodes are present. Many localization problems assume that some nodes have known locations and propagate location information about other nodes using triangulation procedures. In our formulation, we do not requi...

We present a method for converting photoluminescence images into carrier lifetime images for siliconwafers with inhomogeneous lifetime distributions, such as multi-crystalline silicon wafers, based on a calibration factor extracted from a separate, homogeneous, mono-crystalline calibration wafer and simple optical modelling of the photoluminescence signal from both the calibrationwafer and the ...

Objective: Radiochromic EBT3 film is a later generation of radiochromic films. The aim of this study is to compare EBT and EBT3 radiochromic films in radiotherapy fields of breast cancer.Methods: A RANDO phantom was irradiated by a 6 MV Siemens Primus linac with medial and lateral fields of radiotherapy of breast cancer. Dosimetry was performed in various points in the fields using EBT and EBT3...

The problem of particle number density measurements with a laser Doppler anemometer is addressed. Analytical expressions for the instrument measurement cross section are given. An automatic calibration method for determining unknown scattering parameters, which promises good accuracy in changeable optical conditions, is described. Estimates of the measurement uncertainty are derived and the met...

A Close Range Stereo Vision Cell is described which is used to obtain high density, accurate 3D coordinates for shape characterisation of free form surfaces. Since the final accuracy of the 3D coordinate data is dependent on the accuracy of the camera interior and exterior orientation parameters, the errors introduced through the use and calibration of CCD cameras has received particular attent...