13. THE FORMATION DENSITY LOG 13.1 Introduction The formation density log measures the bulk density of the formation. Its main use is to derive a value for the total porosity of the formation. It s also useful in the detection of gas-bearing formations and in the recognition of evaporites. The formation density tools are induced radiation tools.
Calculating WAIC from Bayesian AFT models run in JAGSMay 24, 2017 · However, I also want to calculate the log-likelihoods for each observation at each scan. For non-censored observations, this is simply the log-density. For censored observations, we must use the log of the survival function, which is the probability of obtaining a survival time at least as extreme as our censoring time.

Density LogObtaining Porosities from A Density LogNeutron LogObtaining Porosities from A Neutron LogCombination DensityNeutron LogsObtaining Porosity from DensityNeutron LogsExample Density-Neutron LogUsing A DensityNeutron CrossplotSee AlsoThe density log measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation electrons and scatter. A detector, located a fixed distance from the tool source, counts the number of returning gamma rays. The number of returning gamma rays is an indicator of formation bulk density. The litho-density tool (LDT) also provides a photoelectron (Pe) cross section curve, an independent indicator of litDensity CalculatorThis free density calculator determines any of the three variables in the density equation given the other two. In addition, explore hundreds of other calculators including topics such as finance, math, health, fitness, weather, and even transportation.
Estimation on Reliability Models of Bearing Failure DataThe failure data of bearing products is random and discrete and shows evident uncertainty. Is it accurate and reliable to use Weibull distribution to represent the failure model of product? The Weibull distribution, log-normal distribution, and an improved maximum entropy probability distribution were compared and analyzed to find an optimum and precise reliability analysis model. By utilizing
Logarithmic normal distribution Calculator - High accuracy Calculates the probability density function and lower and upper cumulative distribution functions of the logarithmic normal distribution.

The MTTF is the average of the three failure times, which is 11.6667 hours. If these three failures are random samples from a population and the failure times of this population follow a distribution with a probability density function (pdf) of , then the population MTTF can be mathematically calculated by:
Percent Error CalculatorThis free percent error calculator computes the percentage error between an observed value and the true value of a measurement. Explore various other math calculators
Product Reliability and MTBF finalMTBF= (10*500)/2 = 2,500 hours / failure. Whereas for MTTF MTTF= (10*500)/10 = 500 hours / failure. If the MTBF is known, one can calculate the failure rate as the inverse of the MTBF. The formula for failure rate is:failure rate= 1/MTBF = R/T where R is the number of failures and T is total time.

for those who experience the event are related to the unconditional density, hazard and survivor for the entire population. The conditional density is f(t) = f(t) 1 S(1); and it integrates to one. The conditional survivor function is S(t) = S(t) S(1) 1 S(1); and goes down to zero as t!1. Dividing the density Density Log - an overview ScienceDirect TopicsRomeo M. Flores, in Coal and Coalbed Gas, 2014 Density Log. The density log measures the bulk density of the coal reservoir and associated rocks (Figure 7.29) (Scholes & Johnston, 1993).The density tool or gamma density tool utilizes a gamma ray source placed a distance from the gamma ray detector, which measures gamma ray count that is an inverse function of the density of the coal or

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