In the three months of this year the nation's office buildings experienced " negative absorption ."
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"We've had six straight quarters of negative absorption,"
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Covarrubias said there are positive signs, such as a slowing rate of negative absorption, the real estate term for returning unused space to market.
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The rate of negative absorption in the fourth quarter last year was 6.7 million square feet, down from 9 million square feet in the third quarter.
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Costello said that the first quarter of 2001 showed negative absorption in the office sector, meaning that more new unoccupied space was left vacant than rented.
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"We have negative absorption in all three submarkets for the first time since October 1998, " she said, referring to the first two months of this year.
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One indicator is that more space is coming onto the market, mostly via subleases, than is being removed by direct leases, a condition known as negative absorption.
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The rate of negative absorption in the fourth quarter last year was 6 . 7 million square feet, down from 9 million square feet in the third quarter.
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Therefore, the corresponding electronic states can produce only photon emission that is seen as negative absorption, i . e ., gain that is the prerequisite to realizing semiconductor lasers.
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For thermodynamics and for the application of Kirchhoff's law, it is necessary that the total absorption be expressed as the algebraic sum of two components, described respectively by B _ { 12 } and B _ { 21 }, which may be regarded as positive and negative absorption, which are, respectively, the direct photon absorption, and what is commonly called stimulated or induced emission.