aging coefficient (ac) or aged-child ratio or age composition; takes into account the numbers and areas at both ends of the age distribution simultaneously. ac is the total number of individuals aged 65 years and more, divided by the total number of individuals aged 14 years, multiplied by 100. herein, age composition in iranian popu1ations, according to different provinces, place of residence ...

aging coefficient (ac), or aged–child ratio, is the number of individuals aged 65 years and over, divided by the number of individuals aged 0-14, multiplied by 100. in this point–descriptive study, the aging coefficient has been calculated for the followers of four different religions, for the past four respective decades, according to sex and locality. overall age composition in different reli...

BACKGROUND: Seed aging is an important problem in developing countries which seeds stored in inappropriate condition. OBJECTIVES: Current research was carried out to study the effect of seed aging on quantitative parameters of wheat seeds (Chamran cultivar). METHODS: Experiment was carried out based on randomized complete block desi...

Although the Gini coefficient is an ideal measure of income inequality, it may be applied to measure the aging inequality in a society. In this paper, an attempt has been made to develop alternative measures of aging inequality based on the Gini index. The study uses the secondary population data of Asian countries collected from the international data base, US census Bureau. From the analysis ...

Degradation of piezoelectric properties has been studied in ferroelectric PZT films by means of optical interferometry. The degradation under dc bias and aging of poled films have been observed. The decay of piezoelectric coefficient with time is described by a logarithmic law with aging rates comparable to those of switching polarization. The aging rates are shown to be sensitive to poling con...

Brain aging is a complex and heterogeneous process characterized by the selective loss and preservation of brain functions. This study examines the normal aging effects on the cerebral cortex by characterizing changes in functional connectivity using resting-state fMRI data. Previous resting-state fMRI studies on normal aging have examined specific networks of the brain, whereas few studies hav...

Abstract Component ratio change is considered to be the main reason leading deterioration of asphalt properties, but there are few studies on aging mechanism from perspective modifier molecules. To reveal styrene–butadiene–styrene block copolymer (SBS)/styrene butadiene rubber (SBR) compound-modified asphalt, micro in process was studied by combining molecular dynamics (MD) and Fourier transfor...

background: our study aims to determine the correlation between breast cancer tumor size according to imaging (ultrasonography and mammography) with final pathologic report as a gold standard. methods: we included 132 women with pathologically proven invasive breast cancer between april 2011 and december 2013. study variables included tumor size according to pathology (as a gold standard), ultr...

The purpose of this study is to verification of relationship model between Korean new elderly class's recovery resilience and productive aging. As of 2013, this study sampled preliminary elderly people in Gyeonggi-do and other provinces nationwide. Data from a total of effective 484 subjects was analyzed. The collected data was processed using the IBM SPSS 20.0 and AMOS 20.0, and underwent desc...