These - along with ambient temperature and other factors - can have a dramatic effect on performance.
For those who came in on sunny days, the added distraction of the sunny-day photographs had little effect on performance.
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Even four years after the death, most firms show no sign of recovering and the negative effect on performance appears to continue even further beyond that.
Anthony said Woodson's decision to sit him to start the fourth quarter had no effect on his performance.
Unfortunately for the harder-headed managers who prefer logistics to human development, none of the four operational practices showed a significant effect on company performance.
Tests in sterile environments have successfully reduced the number of servers by up to 90 percent without having any negative effect on application performance.
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More companies, he reckons, are starting to realise that if they can move goods through a supply chain faster and more efficiently, the effect on their performance can be profound, going well beyond being able to keep stocks low.
Of course, if you average out stock picks within rote selections of broad stock categories such as health care or technology, Asia or Europe, growth or value, you will find that the major effect on your performance comes from timing the market.
Improved automatic transmissions have also had a big effect in allowing for performance in larger packages.
The Olympics and Paralympics had "no material effect" on its performance, the firm said, and appeared to cut the number of people visiting its outlets.
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And the poverty has as much of a significant effect upon the educational performance and upon the ability of a poor school district already to deliver an equal educational opportunity.
It took years, he says, to show that caffeine had a performance-enhancing effect.
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"We now need to ensure that the legacy of the funding has a long-term effect on improving standards and performance, " she said.
Hence, the provision of appropriate literacy training to children in their formative years has a long-term effect on their entire educational performance.
"There's definitely a performance-enhancing effect if you use things that improve oxygen transport to the tissue, " says Larry Bowers, an expert on athletic drug testing and senior managing director of the U.S. Anti-Doping Agency.
Recent studies conducted by scientists in Israel showed that even losing an hour of sleep a night can have a noticeable effect on a child's mental performance.
When I hear soon-to-be ex-employees recount their reasons for leaving their current job, I often wonder if employers consider what kind of effect their first impression has on future performance of their new employees?
The effect of this was to push up the performance of small caps relative to that of large caps in the first weeks of the year.
To find out what effect a cooling device might have on athletic performance, Dr Grahn and Dr Heller recruited a colleague who was a recreational weightlifter.
At the board's hearing in May, the NTSB will look into a number of topics, including the effect of ice on the aircraft's performance, cold weather operations, the crew's experience and sleep issues.
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The net effect is about 12 to 54 percent faster game performance than NVIDIA's current mobile speed champion, the GTX 680M, and up to four times the general computing prowess in OpenCL. The 8970M is more than up to the task of powering up to 4K in one screen, and it can handle up to six screens if there are enough ports.
Any difference in task performance, then, would be analogous to a placebo effect.
If the incentive effects of performance-related pay for ordinary folk are unproven, the effect of stock options is even harder to demonstrate.
Performance-related pay (PRP) will have a "catastrophic effect" on teacher recruitment and retention, the ATL says.
Performance review season heats up, job searches commence, reorganizations take effect, and big conversations are prepared.
However, there have been factors which influenced its commercial performance including the uncertainty of the Northern Ireland peace process and its effect on inward tourism over the last three years.
"It is also my view that there is too great a degree of variation of performance and that, were we able to reduce this, the effect on children, teachers and schools would be profound, " he said.
And that's without even considering the possible placebo effect, the idea that the psychological boost of believing in the bands can improve performance.
The direct opposite effect is apparent now, as the mutual redemption numbers and apathy towards equity markets regardless of performance demonstrate.
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