4,729 research outputs found
Integrated Project Teams: The MoD's New Hot Potato?
Since the announcement of Smart Procurement, much has been written on the
potential benefits that IPTs will hopefully bring. It is supposed that they will
improve the interface with industry, create a better understanding of
requirements and establish an environment where industry is motivated to perform
and so reduce cost, risk and time into service while improving product quality.
The formation of a team should provide continuity, consistency, flexibility and
~ increased performance due to the integration of a wide-range of functional
activities and decision-making, as well as increased motivation. These may well
be gallant objectives, but how achievable are they? What obstacles does the MoD
face in the implementation of the IPTs? Have they grasped a 'hot potato'
Photon Emission from Ultrarelativistic Plasmas
The emission rate of photons from a hot, weakly coupled ultrarelativistic
plasma is analyzed. Leading-log results, reflecting the sensitivity of the
emission rate to scattering events with momentum transfers from to ,
have previously been obtained. But a complete leading-order treatment requires
including collinearly enhanced, inelastic processes such as bremsstrahlung.
These inelastic processes receive O(1) modifications from multiple scattering
during the photon emission process, which limits the coherence length of the
emitted radiation (the Landau-Pomeranchuk-Migdal effect). We perform a
diagrammatic analysis to identify, and sum, all leading-order contributions. We
find that the leading-order photon emission rate is not sensitive to
non-perturbative scale dynamics. We derive an integral equation for the
photon emission rate which is very similar to the result of Migdal in his
original discussion of the LPM effect. The accurate solution of this integral
equation for specific theories of interest will be reported in a companion
paper.Comment: 50 pages, 20 figures. Added references and minor rewordings:
published versio
Estimating Lattice Artifacts from Flowed SU(2) Calorons
Lattice computations of the high-temperature topological susceptibility of
QCD receive lattice-spacing corrections and suffer from systematics arising
from the type and depth of gradient flow. We study the lattice spacing
corrections to semi-analytically by exploring the behavior
of discretized Harrington-Shepard calorons under the action of different forms
of gradient flow. From our study we conclude that is definitely
too small of a time extent to study the theory at temperatures of order
and we explore how the amount of gradient flow influences the
continuum extrapolation.Comment: 10 pages, 8 figures (published version
Is sea-basing a viable method of providing logistic support to the UK amphibious force?
Maritime power has traditionally been a central part of the UK’s defence planning and is well
suited to supporting a wide range of military operations. The littoral area has always created
problems for naval planners as most landings historically have had to endure a tactical
separation of the naval and land components, and hence an artificial seam between the Navy
and the Marines. With the end of the Cold War, amphibious operations are going to be more
difficult to conduct than in the past, and amphibious forces are going to have to adopt
manoeuvre warfare capabilities in order to successfully complete their missions. It is very
likely that amphibious forces will have to conduct operations against a numerically superior
enemy, who is on his own terrain, and be surrounded by a neutral, if not hostile populace. As
such, the concept of Operational Manoeuvre From The Sea (OMFTS) whereby the sea is used
as a manoeuvre space, and command and control is fast enough to cope with large amounts of
information, but at the same time allow subordinates maximum flexibility to use their
initiative, is increasingly attractive. It will be important not only for the combat elements to be
able to use this new concept, but the Combat Service Support (CSS) elements as well
Implications for the U.S. of Anglo-French Defense Cooperation
The paper analyzes, from a predominantly UK perspective, the implications for
the U.S. of the November 2, 2010, Anglo-French Defence Cooperation Treaty. The
current pressures on British and French defence budgets were the primary driving
force behind this cooperative effort. London and Paris have made steps toward
improving joint efforts in a number of areas, with defence acquisition and
industrial cooperation being prominent. In the UK, there appears to be strong
political support at the highest levels, which has permeated to lower levels in
the bureaucracy, while the UK defence industry appears to be cautiously
optimistic about future business opportunities.
The impact of enhanced Anglo-French cooperation on the U.S. would appear to be
largely favourable for Washington. Rather than providing a basis for weakened UK
attention to the U.S., as some fear, the efforts by London and Paris will
potentially generate greater national military capability from scarce resources
and could serve as a vehicle for broader European efforts to enhance their
defence capabilities. While multinational European military development projects
are viewed with scepticism in the UK, the Anglo-French arrangement could
strengthen the prospects for bilateral projects in which other European states
may elect to participate
- …