@article{435, abstract = {It is shown that two fundamentally different phenomena, the bound states in continuum and the spectral singularity (or time-reversed spectral singularity), can occur simultaneously. This can be achieved in a rectangular core dielectric waveguide with an embedded active (or absorbing) layer. In such a system a two-dimensional bound state in a continuum is created in the plane of a waveguide cross section, and it is emitted or absorbed along the waveguide core. The idea can be used for experimental implementation of a laser or a coherent-perfect-absorber for a photonic bound state that resides in a continuous spectrum.}, author = {Midya, Bikashkali and Konotop, Vladimir}, journal = {Optics Letters}, number = {3}, pages = {607 -- 610}, publisher = {Optica Publishing Group}, title = {{Coherent-perfect-absorber and laser for bound states in a continuum}}, doi = {10.1364/OL.43.000607}, volume = {43}, year = {2018}, } @article{139, abstract = {Genome-scale diversity data are increasingly available in a variety of biological systems, and can be used to reconstruct the past evolutionary history of species divergence. However, extracting the full demographic information from these data is not trivial, and requires inferential methods that account for the diversity of coalescent histories throughout the genome. Here, we evaluate the potential and limitations of one such approach. We reexamine a well-known system of mussel sister species, using the joint site frequency spectrum (jSFS) of synonymousmutations computed either fromexome capture or RNA-seq, in an Approximate Bayesian Computation (ABC) framework. We first assess the best sampling strategy (number of: individuals, loci, and bins in the jSFS), and show that model selection is robust to variation in the number of individuals and loci. In contrast, different binning choices when summarizing the jSFS, strongly affect the results: including classes of low and high frequency shared polymorphisms can more effectively reveal recent migration events. We then take advantage of the flexibility of ABC to compare more realistic models of speciation, including variation in migration rates through time (i.e., periodic connectivity) and across genes (i.e., genome-wide heterogeneity in migration rates). We show that these models were consistently selected as the most probable, suggesting that mussels have experienced a complex history of gene flow during divergence and that the species boundary is semi-permeable. Our work provides a comprehensive evaluation of ABC demographic inference in mussels based on the coding jSFS, and supplies guidelines for employing different sequencing techniques and sampling strategies. We emphasize, perhaps surprisingly, that inferences are less limited by the volume of data, than by the way in which they are analyzed.}, author = {Fraisse, Christelle and Roux, Camille and Gagnaire, Pierre and Romiguier, Jonathan and Faivre, Nicolas and Welch, John and Bierne, Nicolas}, journal = {PeerJ}, number = {7}, publisher = {PeerJ}, title = {{The divergence history of European blue mussel species reconstructed from Approximate Bayesian Computation: The effects of sequencing techniques and sampling strategies}}, doi = {10.7717/peerj.5198}, volume = {2018}, year = {2018}, } @article{33, abstract = {Secondary contact is the reestablishment of gene flow between sister populations that have diverged. For instance, at the end of the Quaternary glaciations in Europe, secondary contact occurred during the northward expansion of the populations which had found refugia in the southern peninsulas. With the advent of multi-locus markers, secondary contact can be investigated using various molecular signatures including gradients of allele frequency, admixture clines, and local increase of genetic differentiation. We use coalescent simulations to investigate if molecular data provide enough information to distinguish between secondary contact following range expansion and an alternative evolutionary scenario consisting of a barrier to gene flow in an isolation-by-distance model. We find that an excess of linkage disequilibrium and of genetic diversity at the suture zone is a unique signature of secondary contact. We also find that the directionality index ψ, which was proposed to study range expansion, is informative to distinguish between the two hypotheses. However, although evidence for secondary contact is usually conveyed by statistics related to admixture coefficients, we find that they can be confounded by isolation-by-distance. We recommend to account for the spatial repartition of individuals when investigating secondary contact in order to better reflect the complex spatio-temporal evolution of populations and species.}, author = {Bertl, Johanna and Ringbauer, Harald and Blum, Michaël}, journal = {PeerJ}, number = {10}, publisher = {PeerJ}, title = {{Can secondary contact following range expansion be distinguished from barriers to gene flow?}}, doi = {10.7717/peerj.5325}, volume = {2018}, year = {2018}, } @article{5673, abstract = {Cell polarity, manifested by the localization of proteins to distinct polar plasma membrane domains, is a key prerequisite of multicellular life. In plants, PIN auxin transporters are prominent polarity markers crucial for a plethora of developmental processes. Cell polarity mechanisms in plants are distinct from other eukaryotes and still largely elusive. In particular, how the cell polarities are propagated and maintained following cell division remains unknown. Plant cytokinesis is orchestrated by the cell plate—a transient centrifugally growing endomembrane compartment ultimately forming the cross wall1. Trafficking of polar membrane proteins is typically redirected to the cell plate, and these will consequently have opposite polarity in at least one of the daughter cells2–5. Here, we provide mechanistic insights into post-cytokinetic re-establishment of cell polarity as manifested by the apical, polar localization of PIN2. We show that the apical domain is defined in a cell-intrinsic manner and that re-establishment of PIN2 localization to this domain requires de novo protein secretion and endocytosis, but not basal-to-apical transcytosis. Furthermore, we identify a PINOID-related kinase WAG1, which phosphorylates PIN2 in vitro6 and is transcriptionally upregulated specifically in dividing cells, as a crucial regulator of post-cytokinetic PIN2 polarity re-establishment.}, author = {Glanc, Matous and Fendrych, Matyas and Friml, Jirí}, issn = {2055-0278}, journal = {Nature Plants}, number = {12}, pages = {1082--1088}, publisher = {Nature Research}, title = {{Mechanistic framework for cell-intrinsic re-establishment of PIN2 polarity after cell division}}, doi = {10.1038/s41477-018-0318-3}, volume = {4}, year = {2018}, } @article{198, abstract = {We consider a class of students learning a language from a teacher. The situation can be interpreted as a group of child learners receiving input from the linguistic environment. The teacher provides sample sentences. The students try to learn the grammar from the teacher. In addition to just listening to the teacher, the students can also communicate with each other. The students hold hypotheses about the grammar and change them if they receive counter evidence. The process stops when all students have converged to the correct grammar. We study how the time to convergence depends on the structure of the classroom by introducing and evaluating various complexity measures. We find that structured communication between students, although potentially introducing confusion, can greatly reduce some of the complexity measures. Our theory can also be interpreted as applying to the scientific process, where nature is the teacher and the scientists are the students.}, author = {Ibsen-Jensen, Rasmus and Tkadlec, Josef and Chatterjee, Krishnendu and Nowak, Martin}, issn = {1742-5662}, journal = {Journal of the Royal Society Interface}, number = {140}, publisher = {The Royal Society}, title = {{Language acquisition with communication between learners}}, doi = {10.1098/rsif.2018.0073}, volume = {15}, year = {2018}, } @article{5859, abstract = {The emergence of syntax during childhood is a remarkable example of how complex correlations unfold in nonlinear ways through development. In particular, rapid transitions seem to occur as children reach the age of two, which seems to separate a two-word, tree-like network of syntactic relations among words from the scale-free graphs associated with the adult, complex grammar. Here, we explore the evolution of syntax networks through language acquisition using the chromatic number, which captures the transition and provides a natural link to standard theories on syntactic structures. The data analysis is compared to a null model of network growth dynamics which is shown to display non-trivial and sensible differences. At a more general level, we observe that the chromatic classes define independent regions of the graph, and thus, can be interpreted as the footprints of incompatibility relations, somewhat as opposed to modularity considerations.}, author = {Corominas-Murtra, Bernat and Fibla, Martí Sànchez and Valverde, Sergi and Solé, Ricard}, issn = {2054-5703}, journal = {Royal Society Open Science}, number = {12}, publisher = {The Royal Society}, title = {{Chromatic transitions in the emergence of syntax networks}}, doi = {10.1098/rsos.181286}, volume = {5}, year = {2018}, } @unpublished{6183, abstract = {We study the unique solution $m$ of the Dyson equation \[ -m(z)^{-1} = z - a + S[m(z)] \] on a von Neumann algebra $\mathcal{A}$ with the constraint $\mathrm{Im}\,m\geq 0$. Here, $z$ lies in the complex upper half-plane, $a$ is a self-adjoint element of $\mathcal{A}$ and $S$ is a positivity-preserving linear operator on $\mathcal{A}$. We show that $m$ is the Stieltjes transform of a compactly supported $\mathcal{A}$-valued measure on $\mathbb{R}$. Under suitable assumptions, we establish that this measure has a uniformly $1/3$-H\"{o}lder continuous density with respect to the Lebesgue measure, which is supported on finitely many intervals, called bands. In fact, the density is analytic inside the bands with a square-root growth at the edges and internal cubic root cusps whenever the gap between two bands vanishes. The shape of these singularities is universal and no other singularity may occur. We give a precise asymptotic description of $m$ near the singular points. These asymptotics generalize the analysis at the regular edges given in the companion paper on the Tracy-Widom universality for the edge eigenvalue statistics for correlated random matrices [arXiv:1804.07744] and they play a key role in the proof of the Pearcey universality at the cusp for Wigner-type matrices [arXiv:1809.03971,arXiv:1811.04055]. We also extend the finite dimensional band mass formula from [arXiv:1804.07744] to the von Neumann algebra setting by showing that the spectral mass of the bands is topologically rigid under deformations and we conclude that these masses are quantized in some important cases.}, author = {Alt, Johannes and Erdös, László and Krüger, Torben H}, booktitle = {arXiv}, title = {{The Dyson equation with linear self-energy: Spectral bands, edges and cusps}}, year = {2018}, } @unpublished{75, abstract = {We prove that any convex body in the plane can be partitioned into m convex parts of equal areas and perimeters for any integer m≥2; this result was previously known for prime powers m=pk. We also give a higher-dimensional generalization.}, author = {Akopyan, Arseniy and Avvakumov, Sergey and Karasev, Roman}, publisher = {arXiv}, title = {{Convex fair partitions into arbitrary number of pieces}}, doi = {10.48550/arXiv.1804.03057}, year = {2018}, } @article{556, abstract = {We investigate the free boundary Schur process, a variant of the Schur process introduced by Okounkov and Reshetikhin, where we allow the first and the last partitions to be arbitrary (instead of empty in the original setting). The pfaffian Schur process, previously studied by several authors, is recovered when just one of the boundary partitions is left free. We compute the correlation functions of the process in all generality via the free fermion formalism, which we extend with the thorough treatment of “free boundary states.” For the case of one free boundary, our approach yields a new proof that the process is pfaffian. For the case of two free boundaries, we find that the process is not pfaffian, but a closely related process is. We also study three different applications of the Schur process with one free boundary: fluctuations of symmetrized last passage percolation models, limit shapes and processes for symmetric plane partitions and for plane overpartitions.}, author = {Betea, Dan and Bouttier, Jeremie and Nejjar, Peter and Vuletic, Mirjana}, issn = {1424-0637}, journal = {Annales Henri Poincare}, number = {12}, pages = {3663--3742}, publisher = {Springer Nature}, title = {{The free boundary Schur process and applications I}}, doi = {10.1007/s00023-018-0723-1}, volume = {19}, year = {2018}, } @misc{5573, abstract = {Graph matching problems for large displacement optical flow of RGB-D images.}, author = {Alhaija, Hassan and Sellent, Anita and Kondermann, Daniel and Rother, Carsten}, keywords = {graph matching, quadratic assignment problem<}, publisher = {Institute of Science and Technology Austria}, title = {{Graph matching problems for GraphFlow – 6D Large Displacement Scene Flow}}, doi = {10.15479/AT:ISTA:82}, year = {2018}, } @misc{5577, abstract = {Data on Austrian open access publication output at Emerald from 2013-2017 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{Emerald Austrian Publications 2013-2017}}, doi = {10.15479/AT:ISTA:89}, year = {2018}, } @misc{5578, abstract = {Data on Austrian open access publication output at IOP from 2012-2015 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{IOP Austrian Publications 2012-2015}}, doi = {10.15479/AT:ISTA:90}, year = {2018}, } @misc{5574, abstract = {Comparison of Scopus' and publisher's data on Austrian publication output at IOP. }, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{Data Check IOP Scopus vs. Publisher}}, doi = {10.15479/AT:ISTA:86}, year = {2018}, } @phdthesis{278, abstract = {Consortial subscription contracts regulate the digital access to publications between publishers and scientific libraries. However, since a couple of years the tendency towards a freely accessible publishing (Open Access) intensifies. As a consequence of this trend the contractual relationship between licensor and licensee is gradually changing as well: More and more contracts exercise influence on open access publishing. The present study attempts to compare Austrian examples of consortial licence contracts, which include components of open access. It describes the difference between pure subscription contracts and differing innovative deals including open access components. Thereby it becomes obvious that for the evaluation of this licence contracts new methods are needed. An essential new element of such analyses is the evaluation of the open access publication numbers. So this study tries to carry out such publication analyses for Austrian open access deals focusing on quantitative questions: How does the number of publications evolve? How does the open access share change? Publications reports of the publishers and database queries from Scopus form the data basis. The analysis of the data points out that differing approaches of contracts result in highly divergent results: Particular deals can prioritize a saving in costs or else the increase of the open access rate. It is to be assumed that within the following years further numerous open access deals will be negotiated. The finding of this study shall provide guidance.}, author = {Villányi, Márton}, pages = {94}, publisher = {Universität Wien}, title = {{Lizenzverträge mit Open-Access-Komponenten an österreichischen Bibliotheken}}, year = {2018}, } @misc{5588, abstract = {Script to perform a simple exponential lifetime fit of a ROI on time stacks acquired with a FLIM X16 TCSPC detector (+example data)}, author = {Hauschild, Robert}, keywords = {FLIM, FRET, fluorescence lifetime imaging}, publisher = {Institute of Science and Technology Austria}, title = {{Fluorescence lifetime analysis of FLIM X16 TCSPC data}}, doi = {10.15479/AT:ISTA:0113}, year = {2018}, } @misc{5582, abstract = {Data on Austrian open access publication output at Taylor&Francis from 2013-2017 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{Taylor&Francis Austrian Publications 2013-2017}}, doi = {10.15479/AT:ISTA:94}, year = {2018}, } @misc{5581, abstract = {Data on Austrian open access publication output at Springer from 2013-2016 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{Springer Austrian Publications 2013-2016}}, doi = {10.15479/AT:ISTA:93}, year = {2018}, } @misc{5580, abstract = {Data on Austrian open access publication output at SAGE from 2013-2017 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{SAGE Austrian Publications 2013-2017}}, doi = {10.15479/AT:ISTA:92}, year = {2018}, } @misc{5579, abstract = {Data on Austrian open access publication output at RSC from 2013-2017 including data analysis.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{RSC Austrian Publications 2013-2017}}, doi = {10.15479/AT:ISTA:91}, year = {2018}, } @misc{5576, abstract = {Comparison of Scopus' and FWF's data on Austrian publication output at T&F.}, author = {Villányi, Márton}, keywords = {Publication analysis, Bibliography, Open Access}, publisher = {Institute of Science and Technology Austria}, title = {{Data Check T&F Scopus vs. FWF}}, doi = {10.15479/AT:ISTA:88}, year = {2018}, }