The phrase "a decline in efficiency" is correct and usable in written English.
You can use it when discussing a reduction in the effectiveness or productivity of a process, system, or individual.
Example: "The recent changes in management have led to a decline in efficiency within the department."
Alternatives: "a drop in efficiency" or "a decrease in efficiency."
Instead, there was a decline in efficiency, a decline in the quality of catch.
Findings show that the air gap influences the heat storage behaviour causing a smooth surface temperature distribution and a decline in efficiency on the other hand.
Taking time off for illness or working part-time doesn't have to mean a decline in efficiency or productivity, rather the reverse, since healthy workers with a good work-life balance are likely to be more, not less productive.
In the other regions, there was a decline in efficiency, namely in the Bratislava region by 0.91%, in the Zilina region by 2.75%, in the Banska Bystrica region by 2.06%, in the Presov region by 6.43% and in the Kosice region by 6.15%.
With multiple target loci for which the efficiency of Cre-medated recombination can be easily quantified with AP histochemistry - including Brn3a, Brn3b, Z/AP, and Fz5 - we have consistently observed a decline in efficiency with increasing postnatal age when tested with a variety of CreER lines, including R26CreER, NFL-IRES-CreER, and ChAT-IRES-CreER (our unpublished observations).
The mean technical change score of 1.46 reflects changes in outputs causing a positive shift in the frontier, while the mean efficiency change (overall mean=0.71) indicates a decline in efficiency relative to the frontier from one year to the next.
The efficiency change was attributed to an increase in pure efficiency of 2.4% and a decline in scale efficiency of 1.2%.
Their method is to compare China's capital efficiency in the 1980s and 1990s with the past decade; they treat any decline in efficiency as evidence of wasted investment.
Perhaps the most telling sign that China's economic model is reaching its limits is a decline in its efficiency.
As the load was increased, the amount of time it took to notice a decline in engine efficiency decreased.
Chlorophyll fluorescence measurement also showed that plants receiving leachate did not suffer from a decline in photosynthetic efficiency.
