5,102 research outputs found
Exact density functional for hard rod mixtures derived from Markov chain approach
Using a Markov chain approach we rederive the exact density functional for
hard rod mixtures on a one-dimensional lattice, which forms the basis of the
lattice fundamental measure theory. The transition probability in the Markov
chain depends on a set of occupation numbers, which reflects the property of a
zero-dimensional cavity to hold at most one particle. For given mean occupation
numbers (density profile), an exact expression for the equilibrium distribution
of microstates is obtained, that means an expression for the unique external
potential that generates the density profile in equilibrium. By considering the
rod ends to fall onto lattice sites, the mixture is always additive.Comment: 4 pages, 1 figur
Post-acquisition image based compensation for thickness variation in microscopy section series
Serial section Microscopy is an established method for volumetric anatomy
reconstruction. Section series imaged with Electron Microscopy are currently
vital for the reconstruction of the synaptic connectivity of entire animal
brains such as that of Drosophila melanogaster. The process of removing
ultrathin layers from a solid block containing the specimen, however, is a
fragile procedure and has limited precision with respect to section thickness.
We have developed a method to estimate the relative z-position of each
individual section as a function of signal change across the section series.
First experiments show promising results on both serial section Transmission
Electron Microscopy (ssTEM) data and Focused Ion Beam Scanning Electron
Microscopy (FIB-SEM) series. We made our solution available as Open Source
plugins for the TrakEM2 software and the ImageJ distribution Fiji
The isomorphism problem for tree-automatic ordinals with addition
This paper studies tree-automatic ordinals (or equivalently, well-founded
linearly ordered sets) together with the ordinal addition operation +.
Informally, these are ordinals such that their elements are coded by finite
trees for which the linear order relation of the ordinal and the ordinal
addition operation can be determined by tree automata. We describe an algorithm
that, given two tree-automatic ordinals with the ordinal addition operation,
decides if the ordinals are isomorphic
Robust Registration of Calcium Images by Learned Contrast Synthesis
Multi-modal image registration is a challenging task that is vital to fuse
complementary signals for subsequent analyses. Despite much research into cost
functions addressing this challenge, there exist cases in which these are
ineffective. In this work, we show that (1) this is true for the registration
of in-vivo Drosophila brain volumes visualizing genetically encoded calcium
indicators to an nc82 atlas and (2) that machine learning based contrast
synthesis can yield improvements. More specifically, the number of subjects for
which the registration outright failed was greatly reduced (from 40% to 15%) by
using a synthesized image
The development of an authentic Mexican Food concept in Europe
Mexican food is on-trend. Top chefs around the world appreciate the variety of the cuisine and
see a tremendous potential in it. In Europe, people are lacking knowledge of Mexican cuisine,
because Mexican food services are rare in terms of authenticity and an adapted version of it is
prevalent.
Therefore, this work project focuses on the development of authentic Mexican food concept in
Europe. Based on actual findings as well as primary and secondary research, four potential
concepts are elaborated and evaluated in order to come up with a top concept â âMercado
AutĂ©nticoâ with its mission, target markets, positioning and marketing-mix
Processes determining heat waves across different European climates
This study presents a comprehensive analysis of processes determining heat waves across different climates in Europe for the period 1979â2016. Heat waves are defined using a percentileâbased index and the main processes quantified along trajectories are adiabatic compression by subsidence and local and remote diabatic processes in the upper and lower troposphere. This Lagrangian analysis is complemented by an Eulerian calculation of horizontal temperature advection. During typical summers in Europe, one or two heat waves occur, with an average duration of five days. Whereas high nearâsurface temperatures over Scandinavia are accompanied by omegaâlike blocking structures at 500âhPa, heat waves over the Mediterranean are connected to comparably flat ridges. Tracing air masses backwards from the heat waves, we identify three trajectory clusters with coherent thermodynamic characteristics, vertical motions, and geographic origins. In all regions, horizontal temperature advection is almost negligible. In two of the three clusters, subsidence in the free atmosphere is very important in establishing high temperatures near the surface, while the air masses in the third cluster are warmed primarily due to diabatic heating near the surface. Large interregional differences occur between the British Isles and western Russia. Over the latter region, nearâsurface transport and diabatic heating appear to be very important in determining the intensity of the heat waves, whereas subsidence and adiabatic warming are of firstâorder importance for the British Isles. Although the largeâscale pattern is quasistationary during heat wave days, new air masses are entrained steadily into the lower troposphere during the life cycle of a heat wave. Overall, the results of the present study provide a guideline as to which processes and diagnostics weather and climate studies should focus on to understand the severity of heat waves
Of course we share! Testing Assumptions about Social Tagging Systems
Social tagging systems have established themselves as an important part in
today's web and have attracted the interest from our research community in a
variety of investigations. The overall vision of our community is that simply
through interactions with the system, i.e., through tagging and sharing of
resources, users would contribute to building useful semantic structures as
well as resource indexes using uncontrolled vocabulary not only due to the
easy-to-use mechanics. Henceforth, a variety of assumptions about social
tagging systems have emerged, yet testing them has been difficult due to the
absence of suitable data. In this work we thoroughly investigate three
available assumptions - e.g., is a tagging system really social? - by examining
live log data gathered from the real-world public social tagging system
BibSonomy. Our empirical results indicate that while some of these assumptions
hold to a certain extent, other assumptions need to be reflected and viewed in
a very critical light. Our observations have implications for the design of
future search and other algorithms to better reflect the actual user behavior
Patients with Borderline Personality Disorder Not Participating in an RCT: Are They Different?
Background: Despite the notion that randomized controlled trials are regarded as the gold standard in psychotherapy research, questions about their generalizability have been raised. This paper focuses on the differences between participants and eligible nonparticipants of a randomized controlled trial for patients with borderline personality disorder (BPD). Sampling and Methods: One hundred forty-two patients were screened, and 122 were found eligible for study participation. Out of these, 64 patients (52.5%) gave informed consent and were included in the study. Results: The 58 eligible nonparticipants showed a lower level of functioning (global assessment of functioning score), had a history of more outpatient treatment attempts and were living alone more often. Regarding acute symptoms and severity of BPD as indexed by suicide attempts, inpatient treatments, substance abuse and history of trauma, no differences between the groups could be detected. Moreover, participants showed significantly more eating disorders, whereas nonparticipants presented more affective and anxiety disorders. Conclusions: The results indicate that lower psychosocial functioning and comorbid affective and anxiety disorders decrease BPD patients' willingness to participate in an RCT. Copyright (C) 2010 S. Karger AG, Base
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