cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Local enrichment and its nonlocal consequences for victim-exploiter metapopulations
Creators: name: Yaari, Gur
name: Solomon, Sorin
name: Schiffer, Marcelo
name: Shnerb, Nadav M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biological Physics (physics.bio-ph)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The stabilizing effects of local enrichment are revisited. Diffusively coupled host-parasitoid and predator-prey metapopulations are shown to admit a stable fixed point, limit cycle or stable torus with a rich bifurcation structure. A linear toy model that yields many of the basic qualitative features of this system is presented. The further nonlinear complications are analyzed in the framework of the marginally stable Lotka-Volterra model, and the continuous time analog of the unstable, host-parasitoid Nicholson-Bailey model. The dependence of the results on the migration rate and level of spatial variations is examined, and the possibility of "nonlocal" effect of enrichment, where local enrichment induces stable oscillations at a distance, is studied. A simple method for basic estimation of the relative importance of this effect in experimental systems is presented and exemplified.
description: 25 pages, 13 figures, to appear physica D 2008
The effect of mass on the kinematics of steady state wheelchair propulsion in adults and children with spinal cord injury
Creators: name: Bednarczyk, Janet H.
Publisher: name: University of British Columbia
Year: 2008

description: A recent trend in wheelchair design has been the reduction of the mass of wheelchairs. The purpose of this study was to examine the effect of mass on the kinematics of steady state wheelchair propulsion. The mass of test chairs (9.3 kg) was manipulated by mass additions (5 and 10 kg) in two, neurologically matched, groups (n=10) of adults and children with spinal cord injury. Three dimensional video analysis was used to determine the movement of upper body angles (elbow, shoulder, trunk, and shoulder abduction). Statistical analysis were multiple univariate, repeated measures analysis of variance (ANOVA) and analysis of covariance (ANCOVA) with significance set at adjusted p values <0.05. The average mass and age of the pediatric group was much smaller than the adult group (37.4 kg and 11.3 years versus 68.5 kg and 33.5 years). The averaged group wheeling velocities were 2.26 m/sec (pediatric) and 2.38 m/sec (adult). A two-(groups)-by-four-(conditions) ANOVA of the actual wheeling velocities showed a significant groups effect and a nonsignificant interaction effect. The two groups spent comparable proportions of the wheeling cycle in propulsion (pediatric = 24.45 %, adult = 24.41 %). A two-(groups)-by-four-(conditions) ANCOVA of the % propulsion data showed that both the groups effect and the groups-by-condition interaction effect were not significantly different. A two-(groups)-by-four-(conditions)-by-six-(portion of wheeling cycle, first 25%) ANCOVA of the angular data (with velocity as the covariate) showed significant differences for three (elbow, shoulder, and shoulder abduction) of the four angular parameters and nonsignificant groups-by-conditions effects. These results, based on a test sample of chairs and subjects, indicate that mass additions did not affect the angular kinematics, % propulsion or wheeling velocities of two groups of subjects with spinal cord injury in steady state, short distance, level wheelchair propulsion. The pediatric group did show significant absolute angular differences from the adult group, but the angular changes over time and across experimental conditions were the same in both groups.
Topological quantum gate entangler for a multi-qubit state
Creators: name: Heydari, Hoshang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We establish a relation between topological and quantum entanglement for a multi-qubit state by considering the unitary representations of the Artin braid group. We construct topological operators that can entangle multi-qubit state. In particular we construct operators that create quantum entanglement for multi-qubit states based on the Segre ideal of complex multi-projective space. We also in detail discuss and construct these operators for two-qubit and three-qubit states.
description: 6 pages
Statistical analysis of undetected point sources in cosmic microwave background maps
Creators: name: Argueso, F.
name: Sanz, J. L.
name: Barreiro, R. B.
name: Herranz, D.
name: Gonzalez-Nuevo, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Cosmic microwave background (CMB) temperature anisotropies follow a Gaussian statistical distribution in the standard inflationary model, but there are non-Gaussian contributions due to astrophysical foregrounds. The detection of the non-Gaussian signal due to extragalactic point sources and its distinction from the possible intrinsic non-Gaussianity is an issue of great importance in CMB analysis. The Mexican Hat Wavelet Family (MHWF), which has been proved very useful for the detection of extragalactic point sources, is applied here to the study of non-Gaussianity due to point sources in CMB maps. We carry out simulations of CMB maps with the characteristics of the forthcoming Planck mission at 70 and 100 GHz and filter them with the MHWF. By comparing the skewness and kurtosis of simulated maps with and without point sources, we are able to detect clearly the non-Gaussian signal due to point sources for flux limits as low as 0.4 Jy (70 GHz) and 0.3 Jy (100 GHz). The second and third members of the MHWF perform better in this respect than the Mexican Hat Wavelet (MHW1) and much better than the Daubechies 4 wavelet. We have also estimated the third order, $K_3$, and fourth order, $K_4$, cumulants produced by point sources at these Planck channels by means of a fit with the MHWF. The average relative errors with respect to the real values are below 12% for fluxes down to 0.6 Jy (70 GHz) and 0.4 Jy (100 GHz). The values of these cumulants allow us to distinguish between different source counts models.
description: 15 pages, 3 figures. Accepted for publication in MNRAS
Contato dialetal e identidade(s)
Creators: name: Oushiro, Livia
Publisher: name: Zenodo
Year: 2019

description: Em contexto de contato dialetal, não raro se considera que a “identidade” dos falantes é um fator preponderante para a manutenção de traços linguísticos do local de origem ou para a aquisição de traços da comunidade anfitriã. Contudo, em estudos sociolinguísticos, nem sempre se define o conceito de “identidade”, tampouco como tal noção foi operacionalizada. Esta comunicação tem o objetivo de problematizar o uso da noção de identidade como meio de explicação para padrões idiossincráticos de falantes específicos. Numa amostra com 40 paraibanos e alagoanos residentes na Região Metropolitana de Campinas, coletada no âmbito do Projeto Processos de Acomodação Dialetal (OUSHIRO, 2018), aplicou-se um mesmo roteiro de entrevista sociolinguística, que incluiu perguntas acerca de opiniões sobre o bairro e a cidade, motivações para a migração, a rede social, os hábitos e, numa escala de zero a dez, os graus de identificação dos participantes com o estado de origem, o Nordeste e o estado de São Paulo. A análise das respostas dos participantes mostra que há homogeneidade quanto ao alto grau de identificação com o local de origem e a região Nordeste, o que contrasta com a grande variabilidade entre os indivíduos quanto a seus usos de seis variáveis sociolinguísticas: (i) a altura da vogal média pretônica /e/ (‘relógio’); (ii) a altura da vogal média pretônica /o/ (‘romã’); (iii) a pronúncia de /r/ em coda (‘porta’); (iv) a pronúncia de /t, d/ antes de [i] (‘tia, dia’); (v) a concordância nominal (‘os meninos’ vs. ‘os menino’); e (vi) a negação sentencial (‘não vi’ vs. ‘não vi não/vi não’). Por outro lado, as respostas dadas quanto ao grau de identificação com São Paulo são mais bem distribuídas. Em análises de regressão logística em modelos de efeitos mistos, a escala de “estadualidade” se correlaciona com a pronúncia de /r/ e a negação sentencial – duas variáveis que diferenciam variedades do Nordeste e do Sudeste –, enquanto a escala de “paulistidade” se correlaciona com a pronúncia de /r/ e a concordância nominal, o que sinaliza uma orientação a normas urbanas locais. As respostas sobre a rede social e os hábitos cotidianos, por sua vez, não revelam correlações com as variáveis analisadas. Desse modo, argumenta-se que a análise de “identidades” deve se aliar a um exame dos significados sociais atrelados a variantes específicas e que a entrevista sociolinguística, apesar de permitir a comparabilidade de respostas, pode não ser capaz de captar a dinâmica dos usos linguísticos.
Νομιμοποίηση Εσόδων από Παράνομες Δραστηριότητες – Ξέπλυμα Μαύρου Χρήματος και Offshore Εταιρίες
Creators: name: Βαδόλας, Γεώργιος Δήμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ξέπλυμα μαύρου χρήματος
Υπεράκτιες εταιρίες
Νομιμοποίηση
Money laundering
Offshore
Legitimization

description: Η νομιμοποίηση εσόδων από παράνομες, δραστηριότητες ή «ξέπλυμα χρημάτων» όπως συνηθίζεται να λέγεται, απασχολεί τις κυβερνήσεις πολλών κρατών και γίνεται μεγάλη προσπάθεια για τον εντοπισμό και την εξουδετέρωση των ατόμων που εμπλέκονται σε αυτή τη διαδικασία. Στόχος ενός μεγάλου αριθμού εγκληματικών πράξεων είναι να δημιουργηθεί κέρδος για το άτομο ή την ομάδα που διεξάγει το έγκλημα. Το ξέπλυμα χρήματος είναι η επεξεργασία αυτών των εγκληματικών εσόδων για να αποκρύψουν την παράνομη προέλευσή τους. Αυτή η διαδικασία είναι κρίσιμης σημασίας καθώς επιτρέπει τους εγκληματίες να απολαύσουν αυτά τα κέρδη, χωρίς να θέτει σε κίνδυνο την πηγή τους. Παράνομες πωλήσεις όπλων, λαθρεμπόριο, διακίνηση ναρκωτικών πορνεία , παράνομο εμπόριο διαμαντιών κ.α. μπορούν να δημιουργήσουν τεράστια ποσά εσόδων. Η υπεξαίρεση, η εκμετάλλευση εμπιστευτικών πληροφοριών, ο εκβιασμός, η δωροδοκία, μπορεί επίσης να παράγουν μεγάλα κέρδη και να δημιουργήσουν το κίνητρο για να "νομιμοποιήσει" κάποιος τα παράνομα κέρδη μέσοι του ξεπλύματος χρήματος. Όταν μια εγκληματική δραστηριότητα παράγει σημαντικά κέρδη, το άτομο ή η ομάδα που εμπλέκονται πρέπει να βρουν έναν τρόπο για να ελέγχουν τα κεφάλαια χωρίς να προσελκύσουν την προσοχή στην υποκείμενη δραστηριότητα ή τα πρόσωπα που εμπλέκονται Οι εγκληματίες το κάνουν αυτό για να πετύχουν την συγκάλυψη των πηγών, αλλάζοντας τη μορφή ενώ μετακινούν τα κεφαλαία σε ένα μέρος όπου είναι λιγότερο πιθανό να προσελκύσουν την προσοχή.
description: The legalization of income from illegal activities or “money laundering” as it is called, is a matter of concern for many countries and great effort is put into the tracking and combating of the people that are involved in this process. A great number of criminal activities aim to create profit for the person or the group that contacts the crime. Money laundering is the process of this illegal income in order to hide their origin. Illegal arms trade, smuggling, drug dealing, prostitution, illegal diamonds’ trade etc. can create a massive amount of income. Embezzlement, the exploitation of confidential information, extortion, bribery, can also be a source of profit and create motive for someone to “legalize” illegal profit through money laundering. When a criminal activity is profitable, the person or the group of people that are involved, should find a way to control the capitals without attracting unwanted attention to the process. This happens in order to achieve the cover up of the sources, changing the form, while the capitals are being moved to a place where it is less likely to attract attention.
Bias adjusted and downscaled snow cover fraction from EURO-CORDEX RCMs for the Greater Alpine Region
Creators: name: Matiu, Michael
Publisher: name: Zenodo
Year: 2021

description: Auxiliary files, code, and data for paper: currently posted as preprint at HESS (https://www.hydrology-and-earth-system-sciences.net/). (data will be uploaded after peer-review) Content: aux-paper_bc-maps-single-rcm.zip:
 Auxiliary figures for the paper. code.zip:
 All code used in processing and manuscript preparation. data_biascorrection.zip:
 Coarse resolution data (0.11°) of raw and bias adjusted snow cover fraction per GCM-RCM, and for different bias adjustment routines (delta change, QM, QDM). Available at monthly, seasonal and annual scales, for the periods 2041-2070 and 2071-2100, and under two emission scenarios (RCP2.6 and RCP8.5). data_downscaling.zip:
 Annual snow cover duration at high resolution (250m) from QDM bias adjusted RCM data. Has single GCM-RCM and ensemble means; for the periods 2041-2070 and 2071-2100, and under two emission scenarios (RCP2.6 and RCP8.5). data_modis.zip:
 Snow cover duration climatologies for the past (2001-2020). Version history: v1.0: initial upload
Two site self consistent method for front propagation in reaction-diffusion system
Creators: name: Kumar, Niraj
name: Tripathy, Goutam
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study front propagation in the reaction diffusion process $A\leftrightarrow2A$ on one dimensional lattice with hard core interaction between the particles. We propose a two site self consistent method (TSSCM) to make analytic estimates for the front velocity and are in excellent agreement with the simulation results for all parameter regimes. We expect that the simplicity of the method will allow one to use this technique for estimating the front velocity in other reaction diffusion processes as well.
description: 6 figures
Probabilistic Analysis of Linear Programming Decoding
Creators: name: Daskalakis, Constantinos
name: Dimakis, Alexandros G.
name: Karp, Richard M.
name: Wainwright, Martin J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: We initiate the probabilistic analysis of linear programming (LP) decoding of low-density parity-check (LDPC) codes. Specifically, we show that for a random LDPC code ensemble, the linear programming decoder of Feldman et al. succeeds in correcting a constant fraction of errors with high probability. The fraction of correctable errors guaranteed by our analysis surpasses previous non-asymptotic results for LDPC codes, and in particular exceeds the best previous finite-length result on LP decoding by a factor greater than ten. This improvement stems in part from our analysis of probabilistic bit-flipping channels, as opposed to adversarial channels. At the core of our analysis is a novel combinatorial characterization of LP decoding success, based on the notion of a generalized matching. An interesting by-product of our analysis is to establish the existence of ``probabilistic expansion'' in random bipartite graphs, in which one requires only that almost every (as opposed to every) set of a certain size expands, for sets much larger than in the classical worst-case setting.
description: To appear, IEEE Transactions on Information Theory, (replaces shorter version that appeared in SODA'07)
Training Data Subset Selection for Regression with Controlled Generalization Error
Creators: name: Sivasubramanian, Durga
name: Iyer, Rishabh
name: Ramakrishnan, Ganesh
name: De, Abir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Data subset selection from a large number of training instances has been a successful approach toward efficient and cost-effective machine learning. However, models trained on a smaller subset may show poor generalization ability. In this paper, our goal is to design an algorithm for selecting a subset of the training data, so that the model can be trained quickly, without significantly sacrificing on accuracy. More specifically, we focus on data subset selection for L2 regularized regression problems and provide a novel problem formulation which seeks to minimize the training loss with respect to both the trainable parameters and the subset of training data, subject to error bounds on the validation set. We tackle this problem using several technical innovations. First, we represent this problem with simplified constraints using the dual of the original training problem and show that the objective of this new representation is a monotone and alpha-submodular function, for a wide variety of modeling choices. Such properties lead us to develop SELCON, an efficient majorization-minimization algorithm for data subset selection, that admits an approximation guarantee even when the training provides an imperfect estimate of the trained model. Finally, our experiments on several datasets show that SELCON trades off accuracy and efficiency more effectively than the current state-of-the-art.
Analysis of a microscopic stochastic model of microtubule dynamic instability
Creators: name: Margolin, Gennady
name: Gregoretti, Ivan V.
name: Goodson, Holly V.
name: Alber, Mark S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Cell Behavior (q-bio.CB)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: A novel theoretical model of dynamic instability of a system of linear (1D) microtubules (MTs) in a bounded domain is introduced for studying the role of a cell edge in vivo and analyzing the effect of competition for a limited amount of tubulin. The model differs from earlier models in that the evolution of MTs is based on the rates of single unit (e.g., a heterodimer per protofilament) transformations, in contrast to postulating effective rates/frequencies of larger-scale changes, extracted, e.g., from the length history plots of MTs. Spontaneous GTP hydrolysis with finite rate after polymerization is assumed, and theoretical estimates of an effective catastrophe frequency as well as other parameters characterizing MT length distributions and cap size are derived. We implement a simple cap model which does not include vectorial hydrolysis. We demonstrate that our theoretical predictions, such as steady state concentration of free tubulin, and parameters of MT length distributions, are in agreement with the numerical simulations. The present model establishes a quantitative link between microscopic parameters governing the dynamics of MTs and macroscopic characteristics of MTs in a closed system. Lastly, we use a computational Monte Carlo model to provide an explanation for non-exponential MT length distributions observed in experiments. In particular, we show that appearance of such non-exponential distributions in the experiments can occur because the true steady state has not been reached, and/or due to the presence of a cell edge.
description: 14 pages, 7 figures
Diversification of cereal-based rotations with soybean as a second crop
Creators: name: Hunyadi Borbélyné, Éva
name: Mészáros, Dóra
name: Trugly, Bence
Publisher: name: Zenodo
Year: 2022
Subjects: DiverIMPACTSPA
Multiple cropping
Rotation
Cropping system
Field

description: Problem Cereal crop rotation in Hungary is usually very simple, given that the economic return of new crops in the rotation is not guaranteed. Solution Soybean could provide a good income for organic farmers, whilst improving the diversity of the arable crop rotation and providing additional benefits. Outcome Farmers can use super early soybean varieties to produce soybean as a second crop in their current cereal based cropping system, limiting their economic risks.
Two-loop corrections to the QCD propagators within the Curci-Ferrari model
Creators: name: Barrios, Nahuel
name: Gracey, John A.
name: and, Marcela Peláez
name: Reinosa, Urko
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We evaluate all two-point correlation functions of the Curci-Ferrari (CF) model in four dimensions and in the presence of mass-degenerate fundamental quark flavors, as a natural extension of an earlier investigation in the quenched approximation. In principle, the proper account of chiral symmetry breaking ($χ$SB) and the corresponding dynamical generation of a quark mass function within the CF model requires one to go beyond perturbation theory \cite{Pelaez:2020ups}. However, it is interesting to assess whether a perturbative description applies to correlation functions that are not directly sensitive to $χ$SB, such as the gluon, ghost and quark dressing functions. We compare our two-loop results for these form factors to QCD lattice data in the two flavor case for two different values of the pion mass, one that is relatively far from the chiral limit, and one that is closer to the physical value. Our results confirm that the QCD gluon and ghost dressing functions are well described by a perturbative approach within the CF model, as already observed at one-loop order in Ref. \cite{Pelaez:2014mxa}. Our new main result is that the quark dressing function is also well captured by the perturbative approach, but only starting at two-loop order, as also anticipated in Ref. \cite{Pelaez:2014mxa}. The quark mass function predicted by the CF model at two-loop order is in good agreement with the data if the quarks are not too light but shows some clear tension with respect to the two-loop CF dressing functions in the close to physical case, as expected. Interestingly, however, we find that there is much less tension between the non-perturbative quark mass function, as it can be obtained from lattice simulations or from \cite{Pelaez:2020ups}, and the two-loop CF dressing functions, which confirms the perturbative nature of the latter.
description: 39 pages, 13 figures
Counting planar random walk holes
Creators: name: Beneš, Christian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G50, 60J65 (Primary)

description: We study two variants of the notion of holes formed by planar simple random walk of time duration $2n$ and the areas associated with them. We prove in both cases that the number of holes of area greater than $A(n)$, where $\{A(n)\}$ is an increasing sequence, is, up to a logarithmic correction term, asymptotic to $n\cdot A(n)^{-1}$ for a range of large holes, thus confirming an observation by Mandelbrot. A consequence is that the largest hole has an area which is logarithmically asymptotic to $n$. We also discuss the different exponent of 5/3 observed by Mandelbrot for small holes.
description: Published in at http://dx.doi.org/10.1214/009117907000000204 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Evaluation and prediction of world records and ultimate performance in track and field
Creators: name: Liu, Yuanlong
Publisher: name: University of British Columbia
Year: 2008

description: The study deals with mathematical models as they apply to predict sports performances with track and field events. The purposes of this study were the following: 1) to identify the best applied mathematical model based on their assumptions, strengths and weaknesses, and the outcome predictions among the models using a comprehensive updated data set; 2) use a comprehensive updated data set and the chosen best fitting model to predict future performances for males and females in selected track and field events, and determine whether women will outperform men and if so, when;3) develop a new random sampling model to predict the world record and ultimate performances based on the assumption(testable) that the performance has already reached an asymptotic level and the best performance population will best able in the next 50 or more years. BMDP-1R and BMDP-3R software were used to fit the linear and nonlinear models and produce statistics to assist in identifying the best fitting model. A FORTRAN 77 Monte Carlo simulation program was written to do the simulation utilizing values derived from extreme value theory for the men’s 1500m event. The world prediction results obtained from the random sampling model were then compared with Glick's theoretical expected number of world records in a given period. The results showed that: 1) the best performance per year data are the most appropriate data in track and field for model development, and the exponential model relating running time and historical year with the best performance data is the most valid deterministic model for prediction of world records and the ultimate performance; 2) the differences between women's and men's performances in track and field will keep diminishing, however, women are not predicted to catch up to the men in the chosen events in this study; 3) a greater performance improvement is expected in the near future for those events in which the performances still exhibit a linear trend (e.g.,10000m, and High jump); 4) under the assumption that the average ultimate performance has been reached in the men's 1500mevent, the random sampling model is an effective method to predict the new world records for this event; 5) according to the random sampling model the waiting time between world records becomes progressively longer with every newly established world record. A world record beyond the limit of 205 seconds for the men's 1500m event could take up to one hundred years or more.
Mini-Batch Consistent Slot Set Encoder for Scalable Set Encoding
Creators: name: Andreis, Bruno
name: Willette, Jeffrey
name: Lee, Juho
name: Hwang, Sung Ju
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Most existing set encoding algorithms operate under the implicit assumption that all the set elements are accessible, and that there are ample computational and memory resources to load the set into memory during training and inference. However, both assumptions fail when the set is excessively large such that it is impossible to load all set elements into memory, or when data arrives in a stream. To tackle such practical challenges in large-scale set encoding, the general set-function constraints of permutation invariance and equivariance are not sufficient. We introduce a new property termed Mini-Batch Consistency (MBC) that is required for large scale mini-batch set encoding. Additionally, we present a scalable and efficient attention-based set encoding mechanism that is amenable to mini-batch processing of sets, and capable of updating set representations as data arrives. The proposed method adheres to the required symmetries of invariance and equivariance as well as maintaining MBC for any partition of the input set. We perform extensive experiments and show that our method is computationally efficient and results in rich set encoding representations for set-structured data.
description: 16 pages
Cosmological evolution with quadratic gravity and nonideal fluids
Creators: name: Chakraborty, Saikat
name: Gregoris, Daniele
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Some cosmological models based on the gravitational theory $f(R) = R+ζR^2$, and on fluids obeying to the equations of state of Redlich-Kwong, Berthelot, and Dieterici are proposed for describing smooth transitions between different cosmic epochs. A dynamical system analysis reveals that these models contain fixed points which correspond to an inflationary, a radiation dominated and a late-time accelerating epoch, and a nonsingular bouncing solution, the latter being an asymptotic fixed point of the compactified phase space. The infinity of the compactified phase space is interpreted as a region in which the non-ideal behaviors of the previously mentioned cosmic fluids are suppressed. Physical constraints on the adopted dimensionless variables are derived by demanding the theory to be free from ghost and tachyonic instabilities, and a novel cosmological interpretation of such variables is proposed through a cosmographic analysis. The different effects of the equation of state parameters on the number of equilibrium solutions and on their stability nature are clarified. Some generic properties of these models, which are not sensitive to the particular fluid considered, are identified, while differences are critically examined by showing that the Redlich-Kwong scenario admits a second radiation-dominated epoch and a Big Rip Singularity.
description: Matches published version
Information-preserving black holes still do not preserve baryon number and other effective global quantum numbers
Creators: name: Stojkovic, Dejan
name: Starkman, Glenn D.
name: Adams, Fred C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been claimed recently that the black hole information-loss paradox has been resolved: the evolution of quantum states in the presence of a black hole is unitary and information preserving. We point out that, contrary to some claims in literature, information-preserving black holes still violate baryon number and any other quantum number which follows from an effective (and thus approximate) or anomalous symmetry.
description: Honorable Mention on Gravity Essay Competition 2005; Published in the special Essay issue of Int.J.Mod.Phys
SIYOSIY PARTIYALAR FAOLIYATIDA YOSHLAR QANOTI FAOLIYATINING O'ZIGA XOS JIHATLARI
Creators: name: Bozorboyev, Eldorbek
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada siyosiy partiyalar faoliyatida yoshlar qanotining o‘ziga xos jihatlari tahlil etiladi. Yoshlar qanoti, siyosiy partiyalarning muhim tarkibiy qismi sifatida, yoshlarni siyosiy jarayonlarga jalb qilish, ularning manfaatlarini ifodalash va ta'lim berish vazifalarini bajaradi. Maqolada yoshlar qanotining innovatsion g‘oyalar, ijtimoiy tarmoqlardan foydalanish, ijtimoiy mas'uliyat va partiya ichidagi qaror qabul qilish jarayonidagi ishtiroki kabi jihatlari yoritiladi. Yoshlar qanoti, zamonaviy ijtimoiy va siyosiy muammolarni yechishda yoshlarning fikrlarini hisobga olish va ularni partiya siyosatiga kiritishda muhim rol o‘ynaydi. Shuningdek, maqola yoshlar qanotining siyosiy partiyalarda ta'sirini oshirish va ularning faoliyatini rivojlantirish bo‘yicha takliflar va tavsiyalarni ham o‘z ichiga oladi. Yoshlar qanotining faoliyatini kuchaytirish, kelajakda ijtimoiy va siyosiy barqarorlikni ta'minlashda muhim omil sifatida ko‘riladi. Ushbu maqola, siyosiy partiyalar, siyosatshunoslar, yoshlar va umuman jamoatchilik uchun muhim ilmiy va amaliy ma'lumotlar taqdim etadi, yoshlar qanotining siyosiy hayotdagi o‘rni va ahamiyatini yanada oshirishga xizmat qiladi.
Ο ρόλος του ψυχολόγου στον παιδικό σταθμό
Creators: name: Κιόση, Αννέτα Λάζαρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: προσχολική ηλικία
παιδικός σταθμός
ψυχολόγος
preschool age
nursery school
psychologist

description: Παρουσιάζεται αρχικά μία σύντομη ιστορική αναδρομή της λειτουργίας των παιδικών σταθμών στην Ελλάδα και μια παρουσίαση του θεσμικού και κανονιστικού πλαισίου που διέπει τη λειτουργία τους. Γίνεται μια σύνδεση του πλαισίου αυτού με το καθηκοντολόγιο του ψυχολόγου καθώς και μια σύγκριση ανάμεσα στη δουλειά των σχολικών ψυχολόγων στις εκπαιδευτικές μονάδες πρωτοβάθμιας εκπαίδευσης και στη δουλειά του ψυχολόγου στον παιδικό σταθμό. Στη συνέχεια παρουσιάζονται τα πολύ ιδιαίτερα αναπτυξιακά χαρακτηριστικά των παιδιών που φοιτούν στους παιδικούς σταθμούς με βάση τις θεωρίες της αναπτυξιακής ψυχολογίας των μεγάλων ψυχοδυναμικών θεωρητικών. Σε επόμενο κεφάλαιο παρουσιάζεται το πρακτικό κομμάτι της δουλειάς, δηλαδή ο τρόπος εργασίας με τους γονείς των νηπίων. Γίνεται μια ανασκόπηση των αιτημάτων που τέθηκαν στο συμβουλευτικό κομμάτι και μια ανάλυση τους μέσα και από παραδείγματα και του τρόπου που αντιμετωπίστηκαν τα αιτήματα. Τέλος, περιγράφεται η κατάσταση των παιδικών σταθμών από την οπτική της ποιότητας των παρεχόμενων υπηρεσιών και ο τρόπος υποστήριξης του προσωπικού από τον ψυχολόγο. Ακολουθούν προτάσεις για βελτίωση των παρεχόμενων υπηρεσιών
description: Initially, a brief historical overview of the operation of kindergartens in Greece and a presentation of the institutional and regulatory framework are presented. The connection between this framework and the psychologist's work is described and a comparison is made between the work of school psychologists in primary education units and the work of a psychologist in a kindergarten. Τhe special developmental characteristics of children attending kindergartens are presented, based on the theories of developmental psychology of major psychodynamic theorists. The next chapter presents the practical part of the job, especially how to work with the parents of the infants. We make an overview of the requests raised during the counseling process and an analysis of them through examples and we describe how the requests were handled. Finally, the situation of the kindergartens is described from the perspective of the quality of the services provided, following the way the psychologist can support the staff and suggestions are made for improving the provided services
Elicitatation of evidentials
Creators: name: Parker, Verdena
name: Escamilla, Ramón
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-311213-02 and VP-311213-03: Elicitatation of evidentials. File VP-311213-02 focuses on evidentials with first-person subjects, based on a 2002 paper by Timothy Curnow (“Types of Interactions between Evidentials and First-person Subjects.” Anthropological Linguistics 44(2): 178-196. File VP-311213-03 focuses on evidentials in relative clauses.
Imprint of spatial curvature on inflation power spectrum
Creators: name: Masso, Eduard
name: Mohanty, Subhendra
name: Nautiyal, Akhilesh
name: Zsembinszki, Gabriel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: If the universe had a large curvature before inflation there is a deviation from the scale invariant perturbations of the inflaton at the beginning of inflation. This may have some effect on the CMB anisotropy at large angular scales. We calculate the density perturbations for both open and closed universe cases using the Bunch-Davies vacuum condition on the initial state. We use our power spectrum to calculate the temperature anisotropy spectrum and compare the results with the WMAP three year data. We find that our power spectrum gives a lower quadrupole anisotropy when $Ω-1 >0$, but matches the temperature anisotropy calculated from the standard Ratra-Peebles power spectrum at large $l$. The determination of spatial curvature from temperature anisotropy data is not much affected by the different power spectra which arise from the choice of different boundary conditions for the inflaton perturbation.
description: 17 pages, 4 figures, revtex4; section on comparison with WMAP3 data added
Cut-Thumbnail: A Novel Data Augmentation for Convolutional Neural Network
Creators: name: Xie, Tianshu
name: Cheng, Xuan
name: Liu, Minghui
name: Deng, Jiali
name: Wang, Xiaomin
name: Liu, Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this paper, we propose a novel data augmentation strategy named Cut-Thumbnail, that aims to improve the shape bias of the network. We reduce an image to a certain size and replace the random region of the original image with the reduced image. The generated image not only retains most of the original image information but also has global information in the reduced image. We call the reduced image as thumbnail. Furthermore, we find that the idea of thumbnail can be perfectly integrated with Mixed Sample Data Augmentation, so we put one image's thumbnail on another image while the ground truth labels are also mixed, making great achievements on various computer vision tasks. Extensive experiments show that Cut-Thumbnail works better than state-of-the-art augmentation strategies across classification, fine-grained image classification, and object detection. On ImageNet classification, ResNet-50 architecture with our method achieves 79.21\% accuracy, which is more than 2.8\% improvement on the baseline.
description: Accepted at ACM MM 2021
From Locality and Unitarity to Cosmological Correlators
Creators: name: Jazayeri, Sadra
name: Pajer, Enrico
name: Stefanyszyn, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the standard approach to deriving inflationary predictions, we evolve a vacuum state in time according to the rules of a given model. Since the only observables are the future values of correlators and not their time evolution, this brings about a large degeneracy: a vast number of different models are mapped to the same minute number of observables. Furthermore, due to the lack of time-translation invariance, even tree-level calculations require an increasing number of nested integrals that quickly become intractable. Here we ask how much of the final observables can be "bootstrapped" directly from locality, unitarity and symmetries. To this end, we introduce two new bootstrap tools to efficiently compute cosmological correlators/wavefunctions. The first is a Manifestly Local Test (MLT) that any $n$-point (wave)function of massless scalars or gravitons must satisfy if it is to arise from a manifestly local theory. When combined with a sub-set of the recently proposed Bootstrap Rules, this allows us to compute explicitly all bispectra to all orders in derivatives for a single scalar. Since we don't invoke soft theorems, this can also be extended to multi-field inflation. The second is a partial energy recursion relation that allows us to compute exchange correlators. Combining a bespoke complex shift of the partial energies with Cauchy's integral theorem and the Cosmological Optical Theorem, we fix exchange correlators up to a boundary term. The latter can be determined up to contact interactions using unitarity and manifest locality. As an illustration, we use these tools to bootstrap scalar inflationary trispectra due to graviton exchange and inflaton self-interactions.
description: Published version
The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster
Creators: name: Durrell, Patrick R.
name: Williams, Benjamin F.
name: Ciardullo, Robin
name: Feldmeier, John J.
name: von Hippel, Ted
name: Sigurdsson, Steinn
name: Jacoby, George H.
name: Ferguson, Henry C.
name: Tanvir, Nial R.
name: Arnaboldi, Magda
name: Gerhard, Ortwin
name: Aguerri, J. Alfonso L.
name: Freeman, Ken
name: Vinciguerra, Matt
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the discovery of a faint (M_V ~ -10.6 +/- 0.2) dwarf spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field. The galaxy is easily resolved in our images, as our color magnitude diagram (CMD) extends > 1 magnitude beyond the tip of the red giant branch (RGB). Thus, it is the deepest CMD for a small dwarf galaxy inside a cluster environment. Using the colors of the RGB stars, we derive a metal abundance for the dwarf of [M/H]= -2.3 +/- 0.3, and show that the metallicity dispersion is less than 0.6 dex at 95% confidence. We also use the galaxy's lack of AGB stars and the absence of objects brighter than M_bol ~ -4.1 +/- 0.2 to show that the system is old (t >~10 Gyr). Finally, we derive the object's structural parameters, and show that the galaxy displays no obvious evidence of tidal threshing. Since the tip of the red giant branch distance ((m-M)_0 = 31.23 +/- 0.17 or D = 17.6 +/- 1.4 Mpc) puts the galaxy near the core of the Virgo cluster, one might expect the object to have undergone some tidal processing. Yet the chemical and morphological similarity between the dwarf and the dSph galaxies of the Local and M81 Group demonstrates that the object is indeed pristine, and not the shredded remains of a much larger galaxy. We discuss the possible origins of this galaxy, and suggest that it is just now falling into Virgo for the first time.
description: 31 pages, 10 figures, accepted for publication in the ApJ
Symmetry-protected multifold exceptional points and their topological characterization
Creators: name: Delplace, Pierre
name: Yoshida, Tsuneya
name: Hatsugai, Yasuhiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the existence of higher order exceptional points (EPs) in non-Hermitian systems, and show that $μ$-fold EPs are stable in $μ-1$ dimensions in the presence of anti-unitary symmetries that are local in parameter space, such as e.g. PT or CP symmetries. This implies in particular that 3-fold and 4-fold symmetry-protected EPs are stable respectively in 2 and 3 dimensions. The stability of such exceptional points is expressed in terms of the homotopy properties of a "resultant vector" that we introduce. Our framework also allows us to rephrase the previously proposed $\mathbb{Z}_2$ index of PT and CP symmetric gapped phases beyond the realm of two-band models. We apply this general formalism to a frictional shallow water model that is found to exhibit 3-fold exceptional points associated with topological numbers $\pm1$. For this model, we also show different non-Hermitian topological transitions associated with these exceptional points, such as their merging and a transition to a regime where propagation becomes forbidden.
description: accepted version to Phys. Rev. Lett
Is there a relationship between pre-natal exercise and postpartum depression
Creators: name: Stephenson, Sheryl L.
Publisher: name: University of British Columbia
Year: 2008

description: Postpartum depression is a phenomenon that has baffled physicians and others involved with the care of childbearing women throughout history. Various theories and explanations of the causes of postpartum depression and suggested treatment have been found in the literature. Since exercise has been shown to be effective in treating and potentially preventing other forms of clinical depression, the purpose of this study was to explore the relationship between regular physical activity during the prenatal period and the incidence of postpartum depression. This study recruited 220 volunteer subjects from maternity wards of two hospitals in the Lower Mainland area. The subjects were requested to give information about their physical activity schedule before pregnancy, during their pregnancy period and after. Subjects were also given a demographic questionnaire, the Perceived Stress Scale and the Norbeck Social Support Scale to complete while in the hospital in the days immediately following childbirth. At six weeks postpartum, the women completed the Edinburgh Postpartum Depression Scale, a scale specifically developed to measure postpartum depression. Using two-way ANOVA's, no relationship was found between regular physical activity and postpartum depression. Since perceived stress and social support had been linked to postpartum depression in the literature, a multiple regression analysis was used to investigate their relationships to the incidence of postpartum depression in the current study. Two profile analyses were used to determine if any relationships existed between demographic characteristics, such as age, income level, occupation, and postpartum depression. Perceived stress was the only variable that was found to be related to postpartum depression. A lack of significance between postpartum depression and the variables chosen in this study (with the exception of perceived stress) may indicate that there is still an unknown factor that makes postpartum depression unique when compared with other depressions. Further research is needed in the potential use of exercise for the treatment of postpartum depression. A clearer understanding of the exercise postpartum depression relationshipis necessary before regular exercise might be used to affect the incidence of postpartum depression. It is also recommended that a more detailed record of physical activity be used to gather information about long term exercise schedule, frequency, duration and intensity of participation in physical activity.
Automatic generation of scientific conference poster
Creators: name: Στεφανίδης, Στέφανος Δημήτριος Σωτηρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αφίσα
Αυτόματη
Επιστημονικό
Poster
Automatic
Scientific

description: Στα πλαίσια αυτής της διπλωματικής προτείναμε έναν νέο αλγόριθμο για την αυτόματη παραγωγή πόστερ επιστημονικών δημοσιεύσεων. Για να το επιτύχουμε αυτό χωρίσαμε το πρόβλημα σε 2 υποπροβλήματα, το ένα είναι της αυτόματης εξαγωγής περίληψης του κειμένου και το δεύτερο είναι η βαθμολόγηση/κατηγοριοποίηση των εικόνων των δημοσιεύσεων βάσει της πιθανότητάς του να είναι εντός πόστερ. Επίσης, δημιουργήσαμε ένα νεό σύνολο δεδομένων που απαρτίζεται από 178 ζεύγη επιστημονικών δημοσιεύσεων πόστερ. Για το υποπρόβλημα της αυτόματης εξαγωγής περίληψης, υλοποιήσαμε έναν αλγόριθμο ο οποίος εξάγει τις πιο σημαντικές προτάσεις ενός κειμένου και αυτές τις θεωρεί ως περίληψή τους. Υλοποιήσαμε 3 διαφορετικές προσεγγίσεις του αλγορίθμου που δημιουργήσαμε για την εξαγωγή περίληψης. Επίσης, αξιολογήσαμε τα αποτελέσματα του αλγορίθμου μας και σε ένα δεύτερο σύνολο δεδομένων, το οποίο έχει δημιουργηθεί από το πανεπιστήμιο του Fudan. Για το υποπρόβλημα της βαθμολόγησης/ταξινόμησης εικόνων, πρώτα εξάγαμε τις εικόνες από της δημοσιεύσεις χρησιμοποιώντας ένα λογισμικό βαθείας μάθησης και έπειτα εκπαιδεύσαμε ένα μοντέλο ώστε να μπορεί να ταξινομήσει της εικόνες μιας δημοσίευσης, βασιζόμενο στην πιθανότητα της εικόνας να βρίσκεται εντός του πόστερ
description: We propose a novel solution to solve the problem of the Automatic Poster Generation of academic papers. We divided it into two distinct subtasks, the text summarization one and the image ranking/classiﬁcation one. Also, we created a new dataset via crawling which consists of 178 poster-paper pairs. For the text summarization sub-task, we implemented an algorithm that extracts the most important sentences of a document as a summary of it. We applied 3 diﬀerent approaches to our text summarization algorithm and we evaluated their outcome using rouge1/f1 and swmd. We evaluated them on the dataset that we crawled and to the one that Fudan university creates for poster generation too. For the image ranking/classiﬁcation sub-task, we ﬁrst extracted the images from pdf ﬁles using a deep learning software called pdffigures2.0 and then we trained a model to rank the images of a paper based on the probability to be included in a poster. We evaluate the results of this procedure with the average precision (ap) metric