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The question of what is necessary for the US to provide its
fighting forces with continuously available surveillance of the
battlefield is considered. The anticipated technological
improvements forecasted to 2025 all support the conclusion that
sufficient capabilities will exist should the US government choose
to collect them into a single system. The resulting unmanned system
will likely be a lighter-than-air vessel capable of operating for
months or a stealthy derivative of the RQ-4 Global Hawk. The single
largest hurdle for either system is the lack of political and
military support for expanding existing unmanned systems. An Air
Force sponsored survey conducted with several military, corporate
and university experts which supports these conclusions is also
presented.
The problem of flow separation from a low pressure turbine blade
was investigated. The operating conditions under which the
separation occurred were documented through measurement of surface
pressure coefficients, boundary layer velocity and turbulence
profiles, total pressure loss coefficient and wake velocity
momentum deficit. Three different means for reducing the losses
associated with the flow separation were also investigated. A
boundary layer trip, dimples, and V -grooves were studied as
passive means requiring no additional energy to reduce the
separation losses. The boundary layer trip was only successful for
an inlet and axial chord Reynolds number of 50k with a reduction in
loss coefficient of 58.2%. Three sets of dimples were tested with
the placement of each at axial chord locations of 50%, 55%, and
65%.
Monitoring Ecological Impacts provides the tools needed by
professional ecologists, scientists, engineers, planners and
managers to design assessment programs that can reliably monitor,
detect and allow management of human impacts on the natural
environment. The procedures described are well grounded in
inferential logic, and the statistical models needed to analyse
complex data are given. Step-by-step guidelines and flow diagrams
provide the reader with clear and useable protocols, which can be
applied in any region of the world and to a wide range of human
impacts. In addition, real examples are used to show how the theory
can be put into practice. Although the context of this book is
flowing water environments, especially rivers and streams, the
advice for designing assessment programs can be applied to any
ecosystem.
Monitoring Ecological Impacts provides the tools needed to design assessment programs that can reliably monitor, detect, and allow management of human impacts on the natural environment. The procedures described are well-grounded in inferential logic, and the statistical models needed to analyse complex data are given. Step-by-step guidelines and flow diagrams provide clear and useable protocols which can be applied in any region of the world, a wide range of human impacts, and any ecosystem. In addition, real examples are used to show how the theory can be put into practice.
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