33 research outputs found
Existence of a Thermodynamic Spin-Glass Phase in the Zero-Concentration Limit of Anisotropic Dipolar Systems
The nature of ordering in dilute dipolar interacting systems dates back to
the work of Debye and is one of the most basic, oldest and as-of-yet unsettled
problems in magnetism. While spin-glass order is readily observed in several
RKKY-interacting systems, dipolar spin-glasses are subject of controversy and
ongoing scrutiny, e.g., in , a rare-earth randomly
diluted uniaxial (Ising) dipolar system. In particular, it is unclear if the
spin-glass phase in these paradigmatic materials persists in the limit of zero
concentration or not. We study an effective model of
using large-scale Monte Carlo simulations that combine parallel tempering with
a special cluster algorithm tailored to overcome the numerical difficulties
that occur at extreme dilutions. We find a paramagnetic to spin-glass phase
transition for all Ho ion concentrations down to the smallest concentration
numerically accessible of 0.1%, and including Ho ion concentrations which
coincide with those studied experimentally up to 16.7%. Our results suggest
that randomly-diluted dipolar Ising systems have a spin-glass phase in the
limit of vanishing dipole concentration, with a critical temperature vanishing
linearly with concentration, in agreement with mean field theory.Comment: 6 pages, 3 figures, 2 table
Novel disordering mechanism in ferromagnetic systems with competing interactions
Ferromagnetic Ising systems with competing interactions are considered in the
presence of a random field. We find that in three space dimensions the
ferromagnetic phase is disordered by a random field which is considerably
smaller than the typical interaction strength between the spins. This is the
result of a novel disordering mechanism triggered by an underlying spin-glass
phase. Calculations for the specific case of the long-range dipolar
LiHo_xY_{1-x}F_4 compound suggest that the above mechanism is responsible for
the peculiar dependence of the critical temperature on the strength of the
random field and the broadening of the susceptibility peaks as temperature is
decreased, as found in recent experiments by Silevitch et al. [Nature (London)
448, 567 (2007)]. Our results thus emphasize the need to go beyond the standard
Imry-Ma argument when studying general random-field systems.Comment: 4+2 pages, 3 figure
Ensemble Neural Networks for Remaining Useful Life (RUL) Prediction
A core part of maintenance planning is a monitoring system that provides a
good prognosis on health and degradation, often expressed as remaining useful
life (RUL). Most of the current data-driven approaches for RUL prediction focus
on single-point prediction. These point prediction approaches do not include
the probabilistic nature of the failure. The few probabilistic approaches to
date either include the aleatoric uncertainty (which originates from the
system), or the epistemic uncertainty (which originates from the model
parameters), or both simultaneously as a total uncertainty. Here, we propose
ensemble neural networks for probabilistic RUL predictions which considers both
uncertainties and decouples these two uncertainties. These decoupled
uncertainties are vital in knowing and interpreting the confidence of the
predictions. This method is tested on NASA's turbofan jet engine CMAPSS
data-set. Our results show how these uncertainties can be modeled and how to
disentangle the contribution of aleatoric and epistemic uncertainty.
Additionally, our approach is evaluated on different metrics and compared
against the current state-of-the-art methods.Comment: 6 pages, 2 figures, 2 tables, conference proceedin
Critical behavior and universality in Levy spin glasses
Using large-scale Monte Carlo simulations that combine parallel tempering
with specialized cluster updates, we show that Ising spin glasses with
Levy-distributed interactions share the same universality class as Ising spin
glasses with Gaussian or bimodal-distributed interactions. Corrections to
scaling are large for Levy spin glasses. In order to overcome these and show
that the critical exponents agree with the Gaussian case, we perform an
extended scaling of the two-point finite size correlation length and the spin
glass susceptibility. Furthermore, we compute the critical temperature and
compare its dependence on the disorder distribution width to recent analytical
predictions [J. Stat. Mech. (2008) P04006].Comment: 7 pages, 6 figures, 2 table
Boolean decision problems with competing interactions on scale-free networks: Equilibrium and nonequilibrium behavior in an external bias
We study the equilibrium and nonequilibrium properties of Boolean decision
problems with competing interactions on scale-free networks in an external bias
(magnetic field). Previous studies at zero field have shown a remarkable
equilibrium stability of Boolean variables (Ising spins) with competing
interactions (spin glasses) on scale-free networks. When the exponent that
describes the power-law decay of the connectivity of the network is strictly
larger than 3, the system undergoes a spin-glass transition. However, when the
exponent is equal to or less than 3, the glass phase is stable for all
temperatures. First, we perform finite-temperature Monte Carlo simulations in a
field to test the robustness of the spin-glass phase and show that the system
has a spin-glass phase in a field, i.e., exhibits a de Almeida-Thouless line.
Furthermore, we study avalanche distributions when the system is driven by a
field at zero temperature to test if the system displays self-organized
criticality. Numerical results suggest that avalanches (damage) can spread
across the whole system with nonzero probability when the decay exponent of the
interaction degree is less than or equal to 2, i.e., that Boolean decision
problems on scale-free networks with competing interactions can be fragile when
not in thermal equilibrium.Comment: 14 pages, 10 figure
Self-Organized Criticality in Glassy Spin Systems Requires a Diverging Number of Neighbors
We investigate the conditions required for general spin systems with
frustration and disorder to display self-organized criticality, a property
which so far has been established only for the fully-connected infinite-range
Sherrington-Kirkpatrick Ising spin-glass model [Phys. Rev. Lett. 83, 1034
(1999)]. Here we study both avalanche and magnetization jump distributions
triggered by an external magnetic field, as well as internal field
distributions in the short-range Edwards-Anderson Ising spin glass for various
space dimensions between 2 and 8, as well as the fixed-connectivity mean-field
Viana-Bray model. Our numerical results, obtained on systems of unprecedented
size, demonstrate that self-organized criticality is recovered only in the
strict limit of a diverging number of neighbors, and is not a generic property
of spin-glass models in finite space dimensions.Comment: 5 pages, 4 figures, 1 tabl
Pervasive gaps in Amazonian ecological research
Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4
While the increasing availability of global databases on ecological communities has advanced our knowledge
of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In
the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of
Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus
crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced
environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian
Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by
2050. This means that unless we take immediate action, we will not be able to establish their current status,
much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio