|
Showing 1 - 25 of
84 matches in All Departments
Detection of concealed explosives is a notoriously difficult
problem, and many different approaches have been proposed to solve
this problem. Nuclear quadrupole resonance (NQR) is unique in many
ways. It operates in a safe AM radio frequency range, and it can
remotely detect unique fingerprint (NQR spectrum) of many
explosives, such as TNT or RDX. As such, the detection of target
does not depend on the shape or material of the container, or the
presence of metallic object such as triggers etc. Spectra of
chemically similar compounds differ enough that their presence
never causes interference or false alarms. Unfortunately,
widespread use is prevented due to low sensitivity, radiofrequency
interference from the noisy environment, and inability to detect
liquid explosives. This book presents current state of the art of
the attempts to overcome NQR sensitivity problem, either by
increasing the strengths of signals generated, or by increasing the
specificity of the technique through a better understanding of the
factors that affect the quadrupolar parameters of specific
explosives. The use of these specific quadrupolar parameters is
demonstrated on signal processing techniques that can detect weak
signals, which are hidden in a noisy background. The problem of
differentiation of liquid explosives and benign liquids in closed
containers is approached by measurements of different nuclear
magnetic resonance (NMR) parameters. As shown, a couple of
solutions has reached a prototype stage and could find their use in
a near future."
Detection of concealed explosives is a notoriously difficult
problem, and many different approaches have been proposed to solve
this problem. Nuclear quadrupole resonance (NQR) is unique in many
ways. It operates in a safe AM radio frequency range, and it can
remotely detect unique fingerprint (NQR spectrum) of many
explosives, such as TNT or RDX. As such, the detection of target
does not depend on the shape or material of the container, or the
presence of metallic object such as triggers etc. Spectra of
chemically similar compounds differ enough that their presence
never causes interference or false alarms. Unfortunately,
widespread use is prevented due to low sensitivity, radiofrequency
interference from the noisy environment, and inability to detect
liquid explosives. This book presents current state of the art of
the attempts to overcome NQR sensitivity problem, either by
increasing the strengths of signals generated, or by increasing the
specificity of the technique through a better understanding of the
factors that affect the quadrupolar parameters of specific
explosives. The use of these specific quadrupolar parameters is
demonstrated on signal processing techniques that can detect weak
signals, which are hidden in a noisy background. The problem of
differentiation of liquid explosives and benign liquids in closed
containers is approached by measurements of different nuclear
magnetic resonance (NMR) parameters. As shown, a couple of
solutions has reached a prototype stage and could find their use in
a near future."
Water resources, both in terms of water quality and water quantity,
are of critical importance in planning for sustainable development
in Central Asia and the Caucasus, as well as in other parts of the
world. This NATO Advanced Research Workshop (ARW), entitled "Risk
Assessment as a Tool for Water Resources Decision-Making in Central
Asia", was conducted on September 23-25, 2002 in Almaty,
Kazakhstan. The ARW addressed methods and approaches by which risk
assessment methodology that has been developed in the United
States, Europe and elsewhere can be applied to environmental and
water resource problems in Central Asia. The stated goals of the
ARWwere: * to assess the existing state of knowledge in the context
of potential applications of risk assessment tools to water
resources and other environmental issues in Central Asia; * to
identify research gaps and directions for future research in the
area of water resources which may be addressed through the
application of risk assessment tools; * to promote closer working
relationships between the scientists and technical experts from
Central Asia and the Caucasus, as well as the scientists and
technical experts from the United States and Europe. Based on
historical experiences of Central Asian scientists and their
colleagues in other parts of the world, there is a demonstrated
need in the region to provide education, training and technical
assistance on environmental decision-making tools, including risk
assessment.
Water resources, both in terms of water quality and water quantity,
are of critical importance in planning for sustainable development
in Central Asia and the Caucasus, as well as in other parts of the
world. This NATO Advanced Research Workshop (ARW), entitled "Risk
Assessment as a Tool for Water Resources Decision-Making in Central
Asia", was conducted on September 23-25, 2002 in Almaty,
Kazakhstan. The ARW addressed methods and approaches by which risk
assessment methodology that has been developed in the United
States, Europe and elsewhere can be applied to environmental and
water resource problems in Central Asia. The stated goals of the
ARWwere: * to assess the existing state of knowledge in the context
of potential applications of risk assessment tools to water
resources and other environmental issues in Central Asia; * to
identify research gaps and directions for future research in the
area of water resources which may be addressed through the
application of risk assessment tools; * to promote closer working
relationships between the scientists and technical experts from
Central Asia and the Caucasus, as well as the scientists and
technical experts from the United States and Europe. Based on
historical experiences of Central Asian scientists and their
colleagues in other parts of the world, there is a demonstrated
need in the region to provide education, training and technical
assistance on environmental decision-making tools, including risk
assessment.
This textbook provides practical tips on the conduct of aortic
surgery, from the aortic valve to the iliac arteries. It is
organized as a series of Plates, each with a key central
illustration, followed by bullet items of accompanying explanatory
text. The accompanying text concentrates on specific, critical
"do's and don'ts" that promote and enhance patient safety. Chapters
include dozens of color illustrations by one of the nation's
premier medical illustrators, along with selected classic "pen and
ink" line drawings. Each central illustration is accompanied by
additional secondary figures interspersed at intervals within the
accompanying text. Each "practical tip" has an accompanying short
(15-30 second) video demonstrating vividly the specific didactic
point being made in each Plate. Chapters provide Q&A sections,
to promote an interactive feel and experience. The textbook shares
practical, potentially life-saving tips-gleaned from over three
decades of experience in thousands of aortic operations-regarding
virtually every standard operation that arises in aortic surgery.
Practical Tips in Aortic Surgery will be an essential resource for
surgeons and trainees at all levels of experience: residents and
fellows, surgical physician assistants, surgical nurses and
technicians, and medical students. The book directly targets two
surgical specialties: Cardiac Surgery and Vascular Surgery
|
|