1,497 research outputs found
Going greener through BPM:a method for assessing processes environmental footprint and supporting continuous improvement
Class of exactly solvable SO(n) symmetric spin chains with matrix product ground states
We introduce a class of exactly solvable SO(n) symmetric Hamiltonians with
matrix product ground states. For an odd case, the ground state is a
translational invariant Haldane gap spin liquid state; while for an even case, the ground state is a spontaneously dimerized state with twofold
degeneracy. In the matrix product ground states for both cases, we identify a
hidden antiferromagnetic order, which is characterized by nonlocal string order
parameters. The ground-state phase diagram of a generalized SO(n) symmetric
bilinear-biquadratic model is discussed.Comment: 11 pages, 5 figure
A pill for the partner via the chlamydia patient? Results from a mixed method study among sexual health care providers in the Netherlands
155OCHEMOTHERAPY OF MALIGNANT PLEURAL MESOTHELIOMA DOES NOT PRECLUDE USE OF CHECK-POINT BLOCKADE
Exact ground states for a class of one-dimensional frustrated quantum spin models
We have found the exact ground state for two frustrated quantum spin-1/2
models on a linear chain. The first model describes ferromagnet-
antiferromagnet transition point. The singlet state at this point has
double-spiral ordering. The second model is equivalent to special case of the
spin-1/2 ladder. It has non-degenerate singlet ground state with exponentially
decaying spin correlations and there is an energy gap. The exact ground state
wave function of these models is presented in a special recurrent form and
recurrence technics of expectation value calculations is developed.Comment: 16 pages, 3 figures, RevTe
A minimal model of an autonomous thermal motor
We consider a model of a Brownian motor composed of two coupled overdamped
degrees of freedom moving in periodic potentials and driven by two heat
reservoirs. This model exhibits a spontaneous breaking of symmetry and gives
rise to directed transport in the case of a non- vanishing interparticle
interaction strength. For strong coupling between the particles we derive an
expression for the propagation velocity valid for arbitrary periodic
potentials. In the limit of strong coupling the model is equivalent to the
B\"uttiker-Landauer model [1-3] for a single particle diffusing in an
environment with position dependent temperature. By using numerical
calculations of the Fokker-Planck equation and simulations of the Langevin
equations we study the model for arbitrary coupling, retrieving many features
of the strong coupling limit. In particular, directed transport emerges even
for symmetric potentials. For distinct heat reservoirs the heat currents are
well-defined quantities allowing a study of the motor efficiency. We show that
the optimal working regime occurs for moderate coupling. Finally, we introduce
a model with discrete phase space which captures the essential features of the
continuous model, can be solved in the limit of weak coupling, and exhibits a
larger efficiency than the continuous counterpart.Comment: Revised version. Extended discussion on the discrete model. To appear
in EP
Estimating Affective Taste Experience Using Combined Implicit Behavioral and Neurophysiological Measures
We trained a model to distinguish an extreme high arousal, unpleasant drink from regular drinks based on a range of implicit behavioral and physiological responses to naturalistic tasting. The trained model predicted arousal ratings of regular drinks, highlighting the possibility to estimate affective experience without having to rely on subjective ratings.</p
Chiral Brownian heat pump
We present the exact analysis of a chiral Brownian motor and heat pump.
Optimization of the construction predicts, for a nanoscale device, frequencies
of the order of kHz and cooling rates of the order of femtojoule per second.Comment: Submitted to Phys. Rev. Let
A pill for the partner via the chlamydia patient? Results from a mixed method study among sexual health care providers in the Netherlands.
Chlamydia prevalence in the Netherlands remains high despite targeted efforts. Effective Partner Notification (PN) and Partner Treatment (PT) can interrupt transmission and prevent re-infections. Patient Initiated Partner Treatment (PIPT) may strengthen chlamydia control. This study explores the current practice of PN and PT, and benefits of, and barriers and facilitators for PIPT among professionals in sexual health care in the Netherlands
Temperley-Lieb Words as Valence-Bond Ground States
Based on the Temperley--Lieb algebra we define a class of one-dimensional
Hamiltonians with nearest and next-nearest neighbour interactions. Using the
regular representation we give ground states of this model as words of the
algebra. Two point correlation functions can be computed employing the
Temperley--Lieb relations. Choosing a spin-1/2 representation of the algebra we
obtain a generalization of the (q-deformed) Majumdar--Ghosh model. The ground
states become valence-bond states.Comment: 9 Pages, LaTeX (with included style files
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