Sentence examples for have been maintained for from inspiring English sources

Ethylene yields exceeding 55 wt.% have been achieved and the reactivity performances have been maintained for more than 500 h.o.s.s

Data are submitted to our programs from hundreds of thousands of people all over the world and are added to databases that have been maintained for decades.

Elevated temperatures at 300 °C, 600 °C, and 800 °C have been maintained for 3 h for both OPC and POCPC paste.

This area is characterised by extensive grasslands that have been maintained for centuries by agriculture and are now threatened by tree and shrub encroachment.

The study was conducted at the Jasper Ridge Global Change Experiment (JRGCE), California where manipulations mimicking increases in temperature, water, nitrogen and carbon-dioxide have been maintained for over 15 years.

Known variously as the "perversion files," the "red flag files" and the "ineligible volunteer files," the documents have been maintained for more than 70 years at the Scouts' national office in Texas.

Surprisingly, perhaps, the Webcam-only point of view has been maintained for the television show.

But although the site has been maintained for 300 years as a garden, several important elements have been lost.

The excellent performance of the focal plane camera has been maintained for more than 6 years in orbit.

Continuous ethanol production has been maintained for several weeks at high productivity with near complete sugar utilization.

He noted that a much smaller spawning-ground sanctuary had been maintained for decades but that something far more drastic proved necessary.