Exact(2)
Economy and reliability selection of casing thread connections type in sulige gas field (in China,Well depth at 3550 m, Gas reservoir pressure 35 MPa) was study.
Therefore, economy and reliability selection of casing thread connections type is one of effective measures to reduce development costs in low –potential gas field.
Similar(58)
The simulations showed that, for selected populations, the base PEV reliability substantially overestimates the reliability of selection of EBV that are mainly based on old information from the parental generation, as is the case with pedigree-based prediction.
To improve inter-rater reliability, a selection of transcripts were reviewed by another member of the team (LD) to check for bias and alternative interpretation of the data.
The incorporation of the uncertainty in rate of detection for reliability updating analysis with inspection results, and for reliability-based selection of optimal inspection and maintenance schedule for resistance deteriorating structures are also presented.
An example of an extreme case of overestimation of reliability of selection by the base PEV reliability is when the EBV of selection candidates are based on a pedigree prediction, which uses only the old information to estimate the parent average (PA) component of the EBV.
These results not only show which processes contribute to the reduction of the reliability of selection in selected populations but also that the base PEV reliabilities overestimate the reliability of selection in such populations by using the base additive genetic variance instead of actual additive genetic variance of selection candidates.
As shown in this study, the equilibrium reliabilities matched the reliability of selection for any type of EBV, which confirms the utility of theoretical expressions to calculate the equilibrium reliability [ 16].
In contrast, the reduced variance of EBVP in progeny has a different effect on the reliability of selection for different types of EBV and is larger for EBV that are primarily based on the PA component and smaller for EBV that are primarily based on the MS component.
The reduction in variance of EBVP in progeny reduces the reliability of selection because EBVP only predicts the PA component of BV and with increasing selection in parents, the predictive ability of EBVP decreases, as illustrated previously.
The resulting PEV reliabilities matched the reliability of selection within the bounds of sampling.
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