9,080 research outputs found
Complexity and coherence
Leslie Topp traces the emergence of the asylum mortuary as an architectural challenge. Drawing on new archival research, Complexity and Coherence: The Challenge of the Asylum Mortuary in Central Europe, 1898–1908 unpacks the highly fraught combination of scientific practices, death rituals, and psychiatric strategies that made up the mortuary's program. Topp analyzes three mortuary buildings in new psychiatric institutions at Vienna, Mauer-Öhling (Lower Austria), and KroměřÞ (Moravia). Far from conforming to an established type, each building represents a radically different approach to the challenge of rendering the program's abrupt juxtapositions meaningful and coherent. In each case the building is conceived within the force field of Wagner School modernism, but the contrasting built results show the diversity of that modernism pushed to its limits by the complexity of the program's requirements and associations
Pilot Survey – Queue Management Strategies for Urban Traffic Control Systems
BACKGROUND
1.1 Advances in traffic signal optimization have produced increases in the capacity of urban road networks, but recent growth in demand has meant that many junctions operate at or above saturation levels. Delay costs increase dramatically when queues extend to block upstream junctions and queue management strategies are now required to ensure that local traffic signals operate effectively when oversaturated conditions occur.
1.2 The aims of this SERC-funded "Queue Management Strategies" project are as follows:
(a) To generalise the strategies for queue management that were developed and tested empirically in Bangkok (See ITS WP 249 and WP 251);
(b) To develop a computer graphics model to represent queue propagation;
(c) To test the strategies' applicability and performance in UK networks;
(d) To investigate their incorporation into standard signal optimization programs
Uniform Equicontinuity for a family of Zero Order operators approaching the fractional Laplacian
In this paper we consider a smooth bounded domain and a
parametric family of radially symmetric kernels
such that, for each , its norm is finite but it blows
up as . Our aim is to establish an independent
modulus of continuity in , for the solution of the
homogeneous Dirichlet problem \begin{equation*} \left \{ \begin{array}{rcll} -
\I_\epsilon [u] \&=\& f \& \mbox{in} \ \Omega. \\ u \&=\& 0 \& \mbox{in} \
\Omega^c, \end{array} \right . \end{equation*} where
and the operator \I_\epsilon has the form \begin{equation*} \I_\epsilon[u](x)
= \frac12\int \limits_{\R^N} [u(x + z) + u(x - z) - 2u(x)]K_\epsilon(z)dz
\end{equation*} and it approaches the fractional Laplacian as .
The modulus of continuity is obtained combining the comparison principle with
the translation invariance of \I_\epsilon, constructing suitable barriers
that allow to manage the discontinuities that the solution may
have on . Extensions of this result to fully non-linear
elliptic and parabolic operators are also discussed
Lipschitz regularity for integro-differential equations with coercive hamiltonians and application to large time behavior
In this paper, we provide suitable adaptations of the "weak version of
Bernstein method" introduced by the first author in 1991, in order to obtain
Lipschitz regularity results and Lipschitz estimates for nonlinear
integro-differential elliptic and parabolic equations set in the whole space.
Our interest is to obtain such Lipschitz results to possibly degenerate
equations, or to equations which are indeed "uniformly el-liptic" (maybe in the
nonlocal sense) but which do not satisfy the usual "growth condition" on the
gradient term allowing to use (for example) the Ishii-Lions' method. We treat
the case of a model equation with a superlinear coercivity on the gradient term
which has a leading role in the equation. This regularity result together with
comparison principle provided for the problem allow to obtain the ergodic large
time behavior of the evolution problem in the periodic setting
Potential economic gains from using forage legumes in organic livestock systems in northern Europe
This report was presented at the UK Organic Research 2002 Conference of the Colloquium of Organic Researchers (COR).
Forage legumes, with their ability to fix nitrogen biologically, seem especially attractive for organic livestock production. In an attempt to assess their true potential, this study draws on a four-year trial conducted at 12 sites in northern Europe with four different forage legumes. One third of the sites were managed as organic systems, with the harvested forage being fed as silage to dairy cows. Based on the trial results, an economic assessment has been made of the potential of forage legumes to improve the competitive edge of organic dairy systems, relative to conventional grass-based ones. Although the results suggest that the organic milk price premium plays a major role in determining the comparative profitability of organic dairy systems, the use of forage legumes also gives a significant cost advantage to organic production
Steady-state thermodynamics of non-interacting transport beyond weak coupling
We investigate the thermodynamics of simple (non-interacting) transport
models beyond the scope of weak coupling. For a single fermionic or bosonic
level -- tunnel-coupled to two reservoirs -- exact expressions for the
stationary matter and energy current are derived from the solutions of the
Heisenberg equations of motion. The positivity of the steady-state entropy
production rate is demonstrated explicitly. Finally, for a configuration in
which particles are pumped upwards in chemical potential by a downward
temperature gradient, we demonstrate that the thermodynamic efficiency of this
process decreases when the coupling strength between system and reservoirs is
increased, as a direct consequence of the loss of a tight coupling between
energy and matter currents.Comment: 6 pages, 2 figures, to appear in EP
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