A method is presented for estimating age-specific mortality based on minimal information: a model life table and an estimate of longevity. This approach uses expected patterns of mammalian survivorship to define a general model of agespecific mortality rates. One such model life table is based on data for northern fur seals (Callorhinus ursinu.r) using Siler’s ( 1979) 5-parameter competing risk...

Abstract: point of view. In this study, a shaking-table was used for concentrating a manganese ore sample from the Ghasem Abadarea in Kerman, Iran. Experiments were designed by using LThe influence of each variable and their interactions on the operation of the device was studied. The variables underinvestigation were: table slope, table frequency, water flowrate, feed rate, and particle size. ...

A matrix population model is a convenient tool for summarizing per capita survival and reproduction rates (collectively vital rates) of a population and can be used for calculating an asymptotic finite population growth rate (λ) and generation time. These two pieces of information can be used for determining the status of a threatened species. The use of stage-structured population models has i...

influence of 13 soybean cultivars (356, m4, m7, m9, clark, sahar, jk, bp, williams, l17, zane, gorgan3 and dpx) on the life table parameters of the cotton bollworm, helicoverpa armigera (hã¼bner) was studied at 25 â± 1â°c, relative humidity of 65 â± 5% and a photoperiod of 16: 8 (l: d) h. the survival rate (lx) of individuals developed to adults from the initial cohort on the mentioned cultivar...