نتایج جستجو برای: gompertz model
تعداد نتایج: 2104767 فیلتر نتایج به سال:
A total of 86 profiles from meat and egg strains of chickens (male and female) were used in this study. Different flexible growth functions were evaluated with regard to their ability to describe the relationship between live weight and age and were compared with the Gompertz and logistic equations, which have a fixed point of inflection. Six growth functions were used: Gompertz, logistic, Lope...
It has been shown experimentally by many researchers that cooling rate and crystallization temperature affect the rate of crystal formation. In this study, crystallization kinetics of coconut oil was measured by monitoring the solid fraction of the oil using pulsed Nuclear Magnetic Resonance (pNMR). Four levels of cooling rate and crytallization temperature were studied. Parameters of crystalli...
As A gets larger the inflection point (when it exists) gets smaller. The parameter we (Drapeau et al., 2000) call a “breakpoint” is the day at which a Gompertz equation plus a flat line fits the data better than the Gompertz alone. The actual values of the breakday occur before the data have settled down to a flat line. This happens because well before an asymptote is reached the rate of increa...
Background: Thalassemia major (TM) is a severe disease and the most common anemia worldwide. The survival time of the disease and its risk factors are of importance for physicians. The present study was conducted to apply the semi-parametric Cox PH model and use parametric proportional hazards (PH) and accelerated failure time (AFT) models to identify the risk factors related to survival of TM ...
In this paper we have proven uniqueness theorems for estimation of the age-dependent parameter α in the Gompertz survival model with a mortality deceleration rate, in the absence of age-specific mortality data. We obtained estimations dependent on and uniform in the population size N . c © 2007 Elsevier Ltd. All rights reserved.
Pandora neoaphidis transmission was monitored within progeny colonies initiated by infected Myzus periscae alates individually flown for 1 to 5 h. Mycosis progress in the colonies was well fitted (r2= 0.97) to a modified logistic or Gompertz model that included their flight distance, postflight survival time, premycosis fecundity, and primary infection rate as influential variables.
The modified sigmoidal bacteria growth functions (the Gompertz, logistic, and Richards) were used to evaluate the methane production process kinetics of agricultural wastes. mesophilic anaerobic co-digestion experiments conducted with various wastes as feedstocks, including cow manure, corn straw, grape leaves, vines, wine residue, strawberry tomato leaves. results showed that manure other incr...
Abstract Biochemical methane potential (BMP) tests are the most reliable method for direct evaluation of yield from a specific feedstock in anaerobic digestion. However, these time-consuming (about 1 month) and quite expensive (need no less than two or three replicates). This study evaluates accuracy “first-order kinetic”, “logistic” “Gompertz” models predicting BMP values, calibrating models’ ...
We have simulated the effect of the diversity of the late expressed genes in the genetic pool of population on the phenotypes of individuals in the late ages. Using Penna model based on the Monte Carlo method we have obtained for the oldest fractions of populations lower mortality rates than predicted by the exponential Gompertz function. Such deviations from the expected exponential increase o...
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