Evolution of small-vacancy clusters in bcc Fe is simulated using a multiscale approach coupling an atomistic activation-relaxation method for sampling transition-state pathways with environment-dependent reaction coordinate calculations and a kinetic Monte Carlo simulation to reach time scales on the order of ~10⁴ s. Under vacancy-supersaturated condition, di- and trivacancy clusters form and g...

Chlamydiae are now commonly detected in genital tract specimens in routine diagnosis by direct immunofluorescence. Direct immunofluorescence is as sensitive and specific as conventional culture.' Studies in our laboratory also suggest that direct immunofluorescence may be a valuable test for cure.2 One of the problems encountered with direct immunofluorescence, as with culture, is the need for ...

As indicated in Bookstein’s introduction [l] sampling is one of the most heavily used methodologies in library research. Moreover, sampling in libraries is not confined to library research alone: also other disciplines occasionally use this technique for research purposes. In this paper we will give a new and complete proof that Fussler’s sampling technique is always better than sampling by len...

BACKGROUND The return of chloroquine-sensitive Plasmodium falciparum to the limited area of Blantyre, Malawi, has been well demonstrated in several studies. METHODS To characterize chloroquine susceptibility over a wide geographic area, infants and children aged 6-59 months were selected using 2-stage cluster sampling in 8 Malawian districts. Pyrosequencing of the pfcrt gene codon 76 region w...

A cross-sectional sero-survey, using a two-stage cluster sampling design, was conducted between 2002 and 2003 in ten administrative regions of central and southern Somalia, to estimate the seroprevalence and geographic distribution of rinderpest (RP) in the study area, as well as to identify potential risk factors for the observed seroprevalence distribution. The study was also used to test the...

In this paper an application of the cluster analysis technique in educational planning is demonstrated by means of a developed computer software with some characteristics of an expert system. The main idea is based on the knowledge-based systems which have been applied in group technology. The software is applied to weekly schedules of the courses and professors of the Industrial Engineering De...

A new method which allows identifying any shape of cluster patterns in case of numerical clustering is proposed. The method is based on the iterative clustering construction utilizing a nearest neighbor distance between clusters to merge. The method differs from other techniques of which the cluster density is determined based on calculating the variance factors. The cluster density proposed he...

Introduction: For dynamic studies such as functional MRI (fMRI), to achieve reasonable temporal resolution, spatial resolution and spatial coverage, it is necessary to use an under-sampling technique to speed up data acquisition. There are two effective ways to remove aliasing artifacts associated with under-sampling. One is parallel imaging (1, 2) and the other is the UNFOLD technique (3). Par...