303,470 research outputs found
Convergence of the largest eigenvalue of normalized sample covariance matrices when p and n both tend to infinity with their ratio converging to zero
Let
where 's are independent and identically distributed (i.i.d.) random
variables with and . It is showed
that the largest eigenvalue of the random matrix
tends to 1 almost surely as with
.Comment: Published in at http://dx.doi.org/10.3150/11-BEJ381 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm
Design procedure for low-drag subsonic airfoils
Airfoil has least amount of drag under given restrictions of boundary layer transition position, lift coefficient, thickness ratio, and Reynolds number based on airfoil chord. It is suitable for use as wing and propeller aircraft sections operating at subsonic speeds and for hydrofoil sections and blades for fans, compressors, turbines, and windmills
Sustainability analysis of Chinese transport policy
Whilst the world economy is developed, the life and development of
human beings have been threatened by the imbalance among environmental and
ecological aspects. Thus sustainability is becoming increasingly the focus of
various social fields. For most developing countries, a strategy with good
sustainability for social development is of long-term significance to keep the
economy in expansion. This paper first reviews the conceptual framework and
up-to-date development of sustainability. Second, it reviews the current transport
situation of China and its future demands. Third, the paper analyses transport policy
from the viewpoints of energy consumption and environment pollution caused by
transportation. It finally summarises suggestions for transport policy that China
should consider in the future
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