[en] Monte Carlo calculations are described which confirm that the response of a spherical thermal-neutron detector at the centre of a spherical moderating assembly in a neutron beam diverging from a point source is simply related to its response in a parallel neutron beam. (orig.)

[en] In neutron spectrometry and dosimetry where Bonner spheres are used, certain questions arise, such as: which of these spheres should be employed in a particular neutron field or energy region, and in a given measuring time, to obtain the neutron spectrum, fluence, or dose equivalent with a minimum uncertainty? These and similar questions in spectrometer optimisation can be answered by means of a general measure of the quality of an experiment, established from basic requirements. The most suitable measure turns out to be the trace of the squared, reduced covariance matrix of the measurands of the experiment, whereby this matrix expresses the individual and mutual uncertainties of the measurement results. (author)

No abstract available

[en] To reduce the error of measurement that the sphere-sphere disturbance caused when the on-line Bonner sphere spectrometers use many slow-sphere in the measurement, this thesis uses MCNP to simulate the impact on sphere-sphere disturbance of three factors of disturb-sphere radius, detect-sphere radius, distance of sphere-sphere, and make a synthesis of simulation and actual measurement results and design a plan of placing slow-sphere. The results show that this plan can reduce the sphere-sphere disturbance to an acceptable level and also can provide the design of on-line Bonner sphere spectrometers with theoretical support and data reference. (authors)

[en] This paper compares the use of both standard unfolding and Bayesian methods to analyze data extracted from neutron spectrometric measurements with a view to deriving some integral quantities characterizing a neutron field. We consider, as an example, the determination of the total neutron fluence and dose in the vicinity of an Am–Be source from Bonner spheres measurements. It is shown that the Bayesian analysis provides a rigorous estimation of these quantities and their correlated uncertainties and overcomes difficulties encountered in the standard unfolding methods.

[en] Collision probabilities in spherical geometry are decomposed into a sum of Meijer's G functions, which are subsequently identified as the product of an exponential and a polynomial of finite degree and are hence easily computed. The series is then summed analytically, and the usual transport kernel for spherical geometry--the exponential integral--appears. A new form of the integral transport equation for the scalar flux is thus found

[en] For plurisubharmonic functions Cⁿ of lower order λ<+∞ estimates of the growth of their maximum value on the sphere of radius r with centre at the origin in terms of the growth of the Nevanlinna characteristics T(r,u) are obtained. These estimates are best possible for λ≤1. The results are new even in the case of functions of the form u= log |f|, where f is an entire function in Cⁿ, n>1

[en] Using the free volume of van der Waals equation, Carnahan-Starling equation for hard spheres, Wilson equation for nonrandom mixing of solution, NRTL equation and our equation, several new equations of states for pure gases are derived. Using these equations, compressibility factors for pure gases are calculated and compared with Nelson-Obert generalized compressibility factor charts. The equation of states using the concept of molecular nonrandom distribution gave better results than those of molecular random distribution. This shows that the molecular nonrandom distribution makes considerable effect on the equation of states

[en] In this paper, we establish a complete classification of umbilic-free submanifolds of the unit sphere with parallel Möbius second fundamental form and arbitrary codimension.

[en] Five NMIs within APMP, including CMS/ITRI, MSL, NIM, NIMT and KRISS from TCPR applied to the APMP technical committee initiative project for funding to carry out a pilot comparison of transmittance haze in 2012. The project started in 2014 and the final report was completed at the end of 2016. In this pilot comparison, three different haze standards were adopted, and transmittance haze for each standard was measured according to ASTM D1003 or ISO 14782. This paper presents the first results of an APMP pilot study of transmittance haze and the analysis of the variation among different haze measurement systems which are commonly used. The study shows that the variables such as sphere multiplier, transmittance distribution, fluorescence of samples and optical path of the incident beam cause discrepancies among NMIs and highlight deficiencies in current documentary standards. (paper)