cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Additional file 2 of Quantitative CT screening improved lumbar BMD evaluation in older patients compared to dual-energy X-ray absorptiometry
Creators: name: Lin, Wentao
name: He, Chaoqin
name: Xie, Faqin
name: Chen, Tao
name: Zheng, Guanghao
name: Yin, Houjie
name: Chen, Haixiong
name: Wang, Zhiyun
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified

description: Additional file 2: Supplementary Table 2. Distribution of diagnostic category for lumbar BMD in male.
Thermodynamics of carrier-mediated magnetism in semiconductors
Creators: name: Petukhov, A. G.
name: Zutic, Igor
name: Erwin, Steven C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose a model of carrier-mediated ferromagnetism in semiconductors that accounts for the temperature dependence of the carriers. The model permits analysis of the thermodynamic stability of competing magnetic states, opening the door to the construction of magnetic phase diagrams. As an example we analyze the stability of a possible reentrant ferromagnetic semiconductor, in which increasing temperature leads to an increased carrier density, such that the enhanced exchange coupling between magnetic impurities results in the onset of ferromagnetism as temperature is raised.
description: 4 pages, 3 figures
Bifurcation in electrostatic resistive drift wave turbulence
Creators: name: Numata, Ryusuke
name: Ball, Rowena
name: Dewar, Robert L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The Hasegawa-Wakatani equations, coupling plasma density and electrostatic potential through an approximation to the physics of parallel electron motions, are a simple model that describes resistive drift wave turbulence. We present numerical analyses of bifurcation phenomena in the model that provide new insights into the interactions between turbulence and zonal flows in the tokamak plasma edge region. The simulation results show a regime where, after an initial transient, drift wave turbulence is suppressed through zonal flow generation. As a parameter controlling the strength of the turbulence is tuned, this zonal flow dominated state is rapidly destroyed and a turbulence-dominated state re-emerges. The transition is explained in terms of the Kelvin-Helmholtz stability of zonal flows. This is the first observation of an upshift of turbulence onset in the resistive drift wave system, which is analogous to the well-known Dimits shift in turbulence driven by ion temperature gradients.
description: 21 pages, 11 figures
Coupling hidden Markov models for the discovery of Cis-regulatory modules in multiple species
Creators: name: Zhou, Qing
name: Wong, Wing Hung
Publisher: name: arXiv
Year: 2007
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Cis-regulatory modules (CRMs) composed of multiple transcription factor binding sites (TFBSs) control gene expression in eukaryotic genomes. Comparative genomic studies have shown that these regulatory elements are more conserved across species due to evolutionary constraints. We propose a statistical method to combine module structure and cross-species orthology in de novo motif discovery. We use a hidden Markov model (HMM) to capture the module structure in each species and couple these HMMs through multiple-species alignment. Evolutionary models are incorporated to consider correlated structures among aligned sequence positions across different species. Based on our model, we develop a Markov chain Monte Carlo approach, MultiModule, to discover CRMs and their component motifs simultaneously in groups of orthologous sequences from multiple species. Our method is tested on both simulated and biological data sets in mammals and Drosophila, where significant improvement over other motif and module discovery methods is observed.
description: Published at http://dx.doi.org/10.1214/07-AOAS103 in the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A Model for Damage Spreading with Damage Healing: Monte Carlo Study of the two Dimensional Ising Ferromagnet
Creators: name: Puzzo, M. Leticia Rubio
name: Albano, Ezequiel V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An Ising model for damage spreading with a probability of damage healing ($q = 1 - p$) is proposed and studied by means of Monte Carlo simulations. In the limit $p \to 1$ the new model is mapped to the standard Ising model. It is found that, for temperatures above the Onsager critical temperature ($T_{C}$), there exist a no trivial finite value of $p$ that sets the critical point ($p_{c}$) for the onset of damage spreading. It is found that $p_{c}$ depends on $T$, defining a critical curve at the border between damage spreading and damage healing. Transitions along such curve are found to belong to the universality class of directed percolation. The phase diagram of the model is also evaluated showing that for large $T$ one has $p_{c} \propto (T- T_{C})^α$, with $α= 1$. Within the phase where the damage remains active, the stationary value of the damage depends lineally on both $p - p_{c}$ and $T - T_{C} $.
description: 12 pages, 7 figures included
The Phenomenology of Elastic Energy Loss
Creators: name: Renk, Thorsten
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The unexpectedly strong suppression of high p_T heavy-quarks in heavy-ion collisions has given rise to the idea that partons propagating through a medium in addition to energy loss by induced radiation also undergo substantial energy loss due to elastic collisions. However, the precise magnitude of this elastic energy loss component is highly controversial. While it is for a parton inside a medium surprisingly difficult to define the difference between elastic and radiative processes rigorously, the main phenomenological difference is in the dependence of energy loss on in-medium pathlength: in a constant medium radiative energy loss is expected to grow quadratically with pathlength, elastic energy loss linearly. In this paper, we investigate a class of energy loss models with such a linear pathlength dependence and demonstrate that they are incompatible with measured data on hard hadronic back-to-back correlations where a substantial variation of pathlength is probed. This indicates that any elastic energy loss component has to be small.
description: 7 pages, 3 figures
SN 2005hj: Evidence for Two Classes of Normal-Bright SNe Ia and Implications for Cosmology
Creators: name: Quimby, Robert
name: Höflich, Peter
name: Wheeler, J. Craig
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: HET Optical spectra covering the evolution from about 6 days before to about 5 weeks after maximum light and the ROTSE-IIIb unfiltered light curve of the "Branch-normal" Type Ia Supernova SN 2005hj are presented. The host galaxy shows HII region lines at redshift of z=0.0574, which puts the peak unfiltered absolute magnitude at a somewhat over-luminous -19.6. The spectra show weak and narrow SiII lines, and for a period of at least 10 days beginning around maximum light these profiles do not change in width or depth and they indicate a constant expansion velocity of ~10,600 km/s. We analyzed the observations based on detailed radiation dynamical models in the literature. Whereas delayed detonation and deflagration models have been used to explain the majority of SNe Ia, they do not predict a long velocity plateau in the SiII minimum with an unvarying line profile. Pulsating delayed detonations and merger scenarios form shell-like density structures with properties mostly related to the mass of the shell, M_shell, and we discuss how these models may explain the observed SiII line evolution; however, these models are based on spherical calculations and other possibilities may exist. SN 2005hj is consistent with respect to the onset, duration, and velocity of the plateau, the peak luminosity and, within the uncertainties, with the intrinsic colors for models with M_shell=0.2 M_sun. Our analysis suggests a distinct class of events hidden within the Branch-normal SNe Ia. If the predicted relations between observables are confirmed, they may provide a way to separate these two groups. We discuss the implications of two distinct progenitor classes on cosmological studies employing SNe Ia, including possible differences in the peak luminosity to light curve width relation.
description: ApJ accepted, 31 pages
Power-law running of the effective gluon mass
Creators: name: Aguilar, Arlene C.
name: Papavassiliou, Joannis
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The dynamically generated effective gluon mass is known to depend non-trivially on the momentum, decreasing sufficiently fast in the deep ultraviolet, in order for the renormalizability of QCD to be preserved. General arguments based on the analogy with the constituent quark masses, as well as explicit calculations using the operator-product expansion, suggest that the gluon mass falls off as the inverse square of the momentum, relating it to the gauge-invariant gluon condensate of dimension four. In this article we demonstrate that the power-law running of the effective gluon mass is indeed dynamically realized at the level of the non-perturbative Schwinger-Dyson equation. We study a gauge-invariant non-linear integral equation involving the gluon self-energy, and establish the conditions necessary for the existence of infrared finite solutions, described in terms of a momentum-dependent gluon mass. Assuming a simplified form for the gluon propagator, we derive a secondary integral equation that controls the running of the mass in the deep ultraviolet. Depending on the values chosen for certain parameters entering into the Ansatz for the fully-dressed three-gluon vertex, this latter equation yields either logarithmic solutions, familiar from previous linear studies, or a new type of solutions, displaying power-law running. In addition, it furnishes a non-trivial integral constraint, which restricts significantly (but does not determine fully) the running of the mass in the intermediate and infrared regimes. The numerical analysis presented is in complete agreement with the analytic results obtained, showing clearly the appearance of the two types of momentum-dependence, well-separated in the relevant space of parameters. Open issues and future directions are briefly discussed.
description: 37 pages, 5 figures
Giovanni Bellini's "The Blood of the Redeemer" : a public image for a private patron
Creators: name: Kristiansen, Anne James
Publisher: name: University of British Columbia
Year: 2010

description: Giovanni Bellini's The Blood of the Redeemer has been traditionally approached in terms of its style and iconography. The two separate lines of investigation have shown the painting to be a complex image that participates in the traditions of both private and public Christ imagery. This thesis will focus on the painting with regard to both the function that it served and the Venetian context in which it was produced. The purpose of the study will be to show the work as a private devotional painting in which the public Christ type has been adapted to fulfill the needs of contemporary Venetian meditations. Chapter One will deal with the two distinct ways in which the work has been discussed and the particular problems that exist in approaching suffering Christ imagery in terms of context. Chapter Two will focus on the development and function of the full-length bleeding Christ in the private and public spheres within the context of Christ-centred piety in the fifteenth century. Chapter Three will discuss Venetian devotions to Christ with particular regard to the impact of historical events. Chapter Four will focus on the adaptation of the public Christ type in The Blood of the Redeemer. The appropriation will be discussed in terms of the liturgical resonances that are brought to the image and with regard to the use of public types in Bellini's other private Christ images. In addition, the importance of northern graphics will be examined as well as the civic associations with which the Christ type had become imbued in northern Italy. The location of the image within a particular social strata will be effected through considering the way in which it addresses contemporary intellectual issues in Venice.
Design of distant retrograde orbits based on a higher order analytical solution
Creators: name: Lara, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: Because the distant retrograde orbits dynamics inherently depends on special functions, approximate analytical solutions in the literature are commonly constrained to providing rough approximations of the qualitative behavior. We rely on perturbation methods and succeed in computing a higher order analytical solution that extends the range of applicability of previous solutions to the problem of relative, quasi-satellite orbits with large librations. Besides, the analytical solution provides two design parameters that are effectively used in the computation of periodic, distant retrograde orbits without constraining to the typical 1:1 resonance.
description: 46 pages, 17 figures
Non-Gaussianities from ekpyrotic collapse with multiple fields
Creators: name: Koyama, Kazuya
name: Mizuno, Shuntaro
name: Vernizzi, Filippo
name: Wands, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We compute the non-Gaussianity of the curvature perturbation generated by ekpyrotic collapse with multiple fields. The transition from the multi-field scaling solution to a single-field dominated regime converts initial isocurvature field perturbations to an almost scale-invariant comoving curvature perturbation. In the specific model of two fields, $ϕ_1$ and $ϕ_2$, with exponential potentials, $-V_i \exp (-c_i ϕ_i)$, we calculate the bispectrum of the resulting curvature perturbation. We find that the non-Gaussianity is dominated by non-linear evolution on super-Hubble scales and hence is of the local form. The non-linear parameter of the curvature perturbation is given by $f_{NL} = 5 c_j^2 /12$, where $c_j$ is the exponent of the potential for the field which becomes sub-dominant at late times. Since $c_j^2$ must be large, in order to generate an almost scale invariant spectrum, the non-Gaussianity is inevitably large. By combining the present observational constraints on $f_{\rm NL}$ and the scalar spectral index, the specific model studied in this paper is thus ruled out by current observational data.
description: 22 pages, 1figure, version revised after journal publication: sign error corrected in the value of non-linear parameter, fNL. The resulting fNL is large and negative and thus in conflict with current observational bounds
Additional file 1 of Haplotype-resolved genomes of two buckwheat crops provide insights into their contrasted rutin concentrations and reproductive systems
Creators: name: Lin, Hao
name: Yao, Yingjun
name: Sun, Pengchuan
name: Feng, Landi
name: Wang, Shuo
name: Ren, Yumeng
name: Yu, Xi
name: Xi, Zhengxiang
name: Liu, Jianquan
Publisher: name: figshare
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Fig. S1. PacBio long reads (2 cell) length distribution of F. esculentum. Fig. S2. Genome size and heterozygosity estimation for F. esculentum. Fig. S3. Hi-C map of the Fe-haplotype 1 showing genome-wide all-by-all interactions. The map shows a high resolution of individual chromosomes that are scaffolded and assembled independently. Fig. S4. Hi-C map of the Fe-haplotype 2 showing genome-wide all-by-all interactions. The map shows a high resolution of individual chromosomes that are scaffolded and assembled independently. Fig. S5. Genome size and heterozygosity estimation for F. tataricum. Fig. S6. PacBio long reads (1 cell) length distribution of F. tataricum. Fig. S7. Hi-C map of the Ft-haplotype 1 showing genome-wide all-by-all interactions. The map shows a high resolution of individual chromosomes that are scaffolded and assembled independently. Fig. S8. Hi-C map of the Ft-haplotype 2 showing genome-wide all-by-all interactions. The map shows a high resolution of individual chromosomes that are scaffolded and assembled independently. Fig. S9. Genome alignment between F. tataricum cv. Pinku1 and Ft-haplotype 1. Fig. S10. Genome alignment between F. tataricum cv. Pinku1 and Ft-haplotype 2.
Tableau-based decision procedure for non-Fregean logic of sentential identity
Creators: name: Pilarek, Joanna Golińska
name: Huuskonen, Taneli
name: Zawidzki, Michał
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4.3; I.2.3; I.2.4; D.3.1
subject: 03B22, 03B35 (Primary) 03B20, 03A05 (Secondary)

description: Sentential Calculus with Identity (SCI) is an extension of classical propositional logic, featuring a new connective of identity between formulas. In SCI two formulas are said to be identical if they share the same denotation. In the semantics of the logic, truth values are distinguished from denotations, hence the identity connective is strictly stronger than classical equivalence. In this paper we present a sound, complete, and terminating algorithm deciding the satisfiability of SCI-formulas, based on labelled tableaux. To the best of our knowledge, it is the first implemented decision procedure for SCI which runs in NP, i.e., is complexity-optimal. The obtained complexity bound is a result of dividing derivation rules in the algorithm into two sets: decomposition and equality rules, whose interplay yields derivation trees with branches of polynomial length with respect to the size of the investigated formula. We describe an implementation of the procedure and compare its performance with implementations of other calculi for SCI (for which, however, the termination results were not established). We show possible refinements of our algorithm and discuss the possibility of extending it to other non-Fregean logics.
description: This is a full version of a conference paper that will appear in the proceedings of the 28th International Conference on Automated Deduction (CADE)
Teaching from the student's point-of-view : a developmental perspective
Creators: name: Levitt, Lori Nadine
Publisher: name: University of British Columbia
Year: 2010

description: This study was an exploratory study of how teachers, when faced with classroom problems which are ill-defined problems, identify and interpret the student's point-of-view. The extent to which the concept of "teacher as problem finder" may describe those teachers who have the structures and strategies necessary for teaching from a developmental perspective was also examined. The non-random sample consisted of 27 primary and intermediate level teachers who participated in district-sponsored in-service courses designed to introduce them to a developmental perspective on education. Participants were asked to complete 'The Student Anecdotes Task' and a questionnaire on their background and experience. Teachers' responses to four questions which accompanied each anecdotal task were rated according to cognitive process variables associated with problem finding and subsequent problem solving. These included: problem formulation, integrative complexity, quality of point-of-view and developmental teaching strategies. Additional variables of interest to the study included, concern for problem finding and several demographic variables. The results suggested that the variables of problem formulation, integrative complexity and quality of point-of-view as well as the developmental teaching strategies may affect how teachers identify and interpret the student's point-of-view in ill-defined problem situations. Implications for teacher education and studies of teacher thinking were discussed. The need for clinical interviews augmented by classroom observations was emphasized for future studies. Several research questions, related to the cognitive process variables identified in this study to affect the teacher's ability to teach from a developmental perspective, were generated.
Learnable Companding Quantization for Accurate Low-bit Neural Networks
Creators: name: Yamamoto, Kohei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Quantizing deep neural networks is an effective method for reducing memory consumption and improving inference speed, and is thus useful for implementation in resource-constrained devices. However, it is still hard for extremely low-bit models to achieve accuracy comparable with that of full-precision models. To address this issue, we propose learnable companding quantization (LCQ) as a novel non-uniform quantization method for 2-, 3-, and 4-bit models. LCQ jointly optimizes model weights and learnable companding functions that can flexibly and non-uniformly control the quantization levels of weights and activations. We also present a new weight normalization technique that allows more stable training for quantization. Experimental results show that LCQ outperforms conventional state-of-the-art methods and narrows the gap between quantized and full-precision models for image classification and object detection tasks. Notably, the 2-bit ResNet-50 model on ImageNet achieves top-1 accuracy of 75.1% and reduces the gap to 1.7%, allowing LCQ to further exploit the potential of non-uniform quantization.
description: Accepted at CVPR 2021
Weather in stellar atmosphere: the dynamics of mercury clouds in alpha Andromedae
Creators: name: Kochukhov, Oleg
name: Adelman, Saul J.
name: Gulliver, Austin F.
name: Piskunov, Nikolai
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The formation of long-lasting structures at the surfaces of stars is commonly ascribed to the action of strong magnetic fields. This paradigm is supported by observations of evolving cool spots in the Sun and active late-type stars, and stationary chemical spots in the early-type magnetic stars. However, results of our seven-year monitoring of mercury spots in non-magnetic early-type star alpha Andromedae show that the picture of magnetically-driven structure formation is fundamentally incomplete. Using an indirect stellar surface mapping technique, we construct a series of 2-D images of starspots and discover a secular evolution of the mercury cloud cover in this star. This remarkable structure formation process, observed for the first time in any star, is plausibly attributed to a non-equilibrium, dynamical evolution of the heavy-element clouds created by atomic diffusion and may have the same underlying physics as the weather patterns on terrestrial and giant planets.
description: 10 pages, 2 figures; to be published in Nature Physics
Phase diagram analysis and crystal growth of solid solutions Ca_{1-x}Sr_xF_2
Creators: name: Klimm, D.
name: Rabe, M.
name: Bertram, R.
name: Uecker, R.
name: Parthier, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The binary phase diagram CaF$_2$--SrF$_2$ was investigated by differential thermal analysis (DTA). Both substances exhibit unlimited mutual solubility with an azeotropic point showing a minimum melting temperature of T_\mathrm{min}=1373^{\circ}$C for the composition Ca$_{0.582}$Sr$_{0.418}$F$_2$. Close to this composition, homogeneous single crystals up to 30 mm diameter without remarkable segregation could be grown by the Czochralski method.
description: accepted for publication in J. Crystal Growth
Additional file 4 of GBC: a parallel toolkit based on highly addressable byte-encoding blocks for extremely large-scale genotypes of species
Creators: name: Zhang, Liubin
name: Yuan, Yangyang
name: Peng, Wenjie
name: Tang, Bin
name: Li, Mulin Jun
name: Gui, Hongsheng
name: Wang, Qiang
name: Li, Miaoxin
Publisher: name: figshare
Year: 2023
Subjects: subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: Additional file 4. Review history.
Dynamic response of Ag monolayers adsorbed on Au(100) upon an oscillatory variation of the chemical potential: A Monte Carlo simulation study
Creators: name: Gimenez, M. Cecilia
name: Albano, Ezequiel V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Based on the fact that the underpotential electrochemical deposition of Ag atoms on the $Au(100)$ surface exhibits sharp first-order phase transitions at well-defined values of the (coexistence) chemical potential ($μ_{coex}$), we performed extensive simulations aimed at investigating the hysteretic dynamic behavior of the system close to coexistence upon the application of a periodic signal of the form $μ(t) = μ_{coex} + μ_{o}sin(2Πt/τ) $, where $μ_{o}$ and $τ$ are the amplitude and the period of the sweep, respectively. For relatively short periods and small enough amplitudes the system becomes trapped either at low or high Ag coverage states, as evidenced by recording hysteresis loops. This scenario is identified as dynamically ordered states (DOS), such that the relaxation time $(τ_{relax})$ of the corresponding metastable state obeys $τ_{relax} > τ$. On the other hand, by properly increasing $μ_{o}$ or/and $τ$, one finds that the $Ag$ coverage gently follows the external drive (here $τ_{relax} < τ$) and the system is said to enter into dynamically disordered states (DDS), where hysteresis loops show almost symmetric limiting cycles. This symmetry breaking between limiting cycles driven by an external signal is discussed in terms of the concept of (out-of-equilibrium) Dynamic Phase Transitions between DOS and DDS, similar to those encountered when a magnetic system is placed in the presence of a variable external magnetic field. However, a careful finite-size scaling study reveals that, at least at $T = 300K$, the $Ag/Au(100)$ system does not exhibit true second-order phase transitions but rather a crossover behavior between states. A diagram showing the location of the ordered and disordered states in the $μ$ versus $τ$ plane is obtained and discussed.
description: 20 pages, 9 figures
Θρησκευτικά και εναλλακτικά τουριστικά μονοπάτια στο Νομό Φλώρινας
Creators: name: Χατζηαθανασίου, Αγγελική Στεργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Φλώρινα
Μοναστήρια
Εναλλακτικός τουρισμός
Florina
Monasteries
Alternative tourism

description: Ο Νομός Φλώρινας παρουσιάζει ξεχωριστό ενδιαφέρον, λόγω του μεγάλου αριθμού τοπίων που συγκεντρώνονται σε μικρή συνολικά έκταση. Νομός, ο οποίος με τις συνεχείς εναλλαγές των τοπίων και τους συνδυασμούς αυτών μέσα στο χώρο (λίμνες, βουνά), δημιουργεί ιδανικές συνθήκες για την ανάπτυξη του εναλλακτικού τουρισμού. Η μικρή κλίμακα εναλλαγής των τοπίων δημιουργεί ζώνες με ενδιάμεσες μεταβατικές οικολογικές συνθήκες και μεγάλη αισθητική αξία. Επιπρόσθετα, η ιδιαίτερη θρησκευτικότητα του Νομού Φλώρινας αντακατοπτρίζεται στα θρησκευτικά μνημεία και μοναστήρια του τόπου. Αυτό διαφαίνεται από την συντήρηση των παλαιών ασκηταριών στην περιοχή των Πρεσπών μέχρι και την τελευταία άνθηση των μοναστηριών της περιοχής. Ένας ευλογημένος τόπος που μπορεί να αξιοποιηθεί μέσω του θρησκευτικού και εναλλακτικού τουρισμού
description: The Prefecture of Florina is of particular interest, due to the large number of landscapes that are concentrated in a small total area. Prefecture, which with the constant changes of landscapes and their combinations within the space (lakes, mountains), creates ideal conditions for the development of alternative tourism. The small scale of landscape change creates zones with intermediate transitional ecological conditions and great aesthetic value. In addition, the special religiosity of the Prefecture of Florina is reflected in the religious monuments and monasteries of the place. This can be seen from the preservation of the old hermitages in the Prespa area to the recent flourishing of the monasteries in the area. A blessed place that can be exploited through religious and alternative tourism
description: Σε συνεργασία με: Τμήμα Διοίκησης οργανισμών, Μάρκετινγκ και Τουρισμού της Σχολής Οικονομίας και Διοίκησης (Θεσσαλονίκης) του Διεθνούς Πανεπιστημίου Ελλάδας
NAS-BERT: Task-Agnostic and Adaptive-Size BERT Compression with Neural Architecture Search
Creators: name: Xu, Jin
name: Tan, Xu
name: Luo, Renqian
name: Song, Kaitao
name: Li, Jian
name: Qin, Tao
name: Liu, Tie-Yan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: While pre-trained language models (e.g., BERT) have achieved impressive results on different natural language processing tasks, they have large numbers of parameters and suffer from big computational and memory costs, which make them difficult for real-world deployment. Therefore, model compression is necessary to reduce the computation and memory cost of pre-trained models. In this work, we aim to compress BERT and address the following two challenging practical issues: (1) The compression algorithm should be able to output multiple compressed models with different sizes and latencies, in order to support devices with different memory and latency limitations; (2) The algorithm should be downstream task agnostic, so that the compressed models are generally applicable for different downstream tasks. We leverage techniques in neural architecture search (NAS) and propose NAS-BERT, an efficient method for BERT compression. NAS-BERT trains a big supernet on a search space containing a variety of architectures and outputs multiple compressed models with adaptive sizes and latency. Furthermore, the training of NAS-BERT is conducted on standard self-supervised pre-training tasks (e.g., masked language model) and does not depend on specific downstream tasks. Thus, the compressed models can be used across various downstream tasks. The technical challenge of NAS-BERT is that training a big supernet on the pre-training task is extremely costly. We employ several techniques including block-wise search, search space pruning, and performance approximation to improve search efficiency and accuracy. Extensive experiments on GLUE and SQuAD benchmark datasets demonstrate that NAS-BERT can find lightweight models with better accuracy than previous approaches, and can be directly applied to different downstream tasks with adaptive model sizes for different requirements of memory or latency.
description: Accepted by KDD 2021
Σύνθεση και μελέτη ιδιοτήτων νέων φουρανοϊκών πολυεστέρων
Creators: name: Τσανακτσής, Βασίλειος Γ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Φουρανοϊκοί
Πολυεστέρες
Βιομάζα
Σύνθεση
Furanoate
Polyesters
Biobased
Synthesis

description: Βάση της συγκεκριμένης διδακτορικής διατριβής αποτέλεσε η επιτακτική ανάγκη για την ανάπτυξη νέων υλικών από πρώτες ύλες που προέρχονται από ανανεώσιμες πηγές, ικανά να αντικαταστήσουν ή ακόμη και να υπερβούν, τα ομόλογά τους που είναι παράγωγα πετρελαίου. Πραγματοποιήθηκε η σύνθεση και η μελέτη των φουρανοϊκών πολυεστέρων (PEF, PPF, PBF, PPeF, PHF, PHepF, POF, PNF, PDeF, PDoF) με αντιδρώντα το διμεθυλεστέρα του FDCA (DMFD) και τις γραμμικές διόλες από 2 μέχρι 12 άτομα άνθρακα, εκτός της 1,11-εντεκανοδιόλης.. Η σύνθεση των πολυμερών έγινε με τη βασική τεχνική πολυσυμπύκνωσης τήγματος δύο σταδίων. Για τις διόλες με υψηλό μοριακό βάρος (με 7, 8, 9, 10 και 12 C) εφαρμόστηκε μια παραλλαγή της βασικής τεχνικής. Η μελέτη των ιδιοτήτων των πολυεστέρων περιλάμβανε ιξωδομετρία, 1Η-NMR, XRD, PLM, DSC, TGA, Py-GC/MS, ενώ στους πολυεστέρες POF, PNF, PDeF, PDoF εφαρμόστηκε και δοκιμή αντοχής στον εφελκυσμό. Συμπερασματικά προέκυψε ότι οι πολυεστέρες είναι ημικρυσταλλικά πολυμερή με υψηλή πυκνότητα πυρήνωσης, είναι θερμικώς σταθερά και όταν διασπώνται δίνουν πλήθος ενώσεων. Με αύξηση του αριθμού των ατόμων άνθρακα της ΕΔΜ το Tg μειώνεται, ενώ το Tm ακολουθεί το φαινόμενο του άρτιου-περιττού αριθμού μεθυλενομάδων. Τέλος, η αντοχή στον εφελκυσμό των POF, PNF, PDeF και PDoF βελτιώνεται με μείωση του αριθμού μεθυλενομάδων στην ΕΔΜ των πολυεστέρων.
description: The basis of the present dissertation was the imperative need for development of new biobased materials, capable of replacing or even exceeding their homologues that are oil derivatives. In the present study, the synthesis of furanoate polyesters was carried out by using the dimethylester of FDCA (DMFD) and diols with 2-6 carbon atoms via the basic polymerization technique (PEF, PPF, PBF, PPeF and PHF), while for the diols with 7-12 carbon atoms (with an exception of 11 carbon atoms) a variation of the basic technique was applied (PHepF, POF, PNF, PDeF and PDoF).The study of the polyesters included viscosity measurements, 1Η-NMR, XRD, PLM, DSC, TGA and Py-GC/MS, while for POF, PNF, PDeF and PDoF tensile test was applied. In conclusion, the synthesized polyesters are semicrystalline materials with high nucleation density, they are thermal stable and they produce a plenty of compounds by degradation. Increasing the number of carbon atoms, Tg decreases, while Tm follows the “even-odd number” effect. Finally, the tensile strength of POF, PNF, PDeF and PDoF is higher when the number of methylene groups in the repeat unit is lower.
Kerr-Schild Structure and Harmonic 2-forms on (A)dS-Kerr-NUT Metrics
Creators: name: Chen, W.
name: Lu, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We demonstrate that the general (A)dS-Kerr-NUT solutions in D dimensions with ([D/2], [(D+1)/2]) signature admit [D/2] linearly-independent, mutually-orthogonal and affinely-parameterised null geodesic congruences. This enables us to write the metrics in a multi-Kerr-Schild form, where the mass and all of the NUT parameters enter the metrics linearly. In the case of D=2n, we also obtain n harmonic 2-forms, which can be viewed as charged (A)dS-Kerr-NUT solution at the linear level of small-charge expansion, for the higher-dimensional Einstein-Maxwell theories. In the BPS limit, these 2-forms reduce to n-1 linearly-independent ones, whilst the resulting Calabi-Yau metric acquires a Kahler 2-form, leaving the total number the same.
description: Latex, 11 pages, references added
Nonlinear domain wall velocity in ferroelectric Si-doped HfO$_{2}$ thin film capacitors
Creators: name: Lim, So Yeon
name: Park, Min Sun
name: Kim, Ahyoung
name: Yang, Sang Mo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the nonlinear response of the domain wall velocity ($v$) to an external electric field ($E_{ext}$) in ferroelectric Si-doped HfO$_{2}$ thin film capacitors using piezoresponse force microscopy (PFM) and switching current measurements. We verified the reliability of the PFM images of ferroelectric domain switching by comparing the switched volume fraction in the PFM images with the time-dependent normalized switched polarization from the switching current data. Using consecutive time-dependent PFM images, we measured the velocity of the pure lateral domain wall motion at various $E_{ext}$. The $E_{ext}$-dependent $v$ values closely follow the nonlinear dynamic response of elastic objects in a disordered medium. The thermally activated creep and flow regimes were observed based on the magnitude of $E_{ext}$. With a dynamic exponent of $μ$ = 1, our thin film was found to have random-field defects, which is consistent with the Lorentzian distribution of characteristic switching time that was indicated in the switching current data.
description: 16 pages, 4 figures
title: Modelling stress‐state dependent nonlocal damage and failure of ductile metals
Creators: name: Nahrmann, Marvin
name: Matzenmiller, Anton
Publisher: name: Universität Kassel
Year: 2021
Subjects: subject: 530
subject: 620
subject: Duktilität
subject: Metall
subject: Schadensmechanik
subject: Spannungszustand
subject: Modell

description: Gefördert im Rahmen des Projekts DEAL
Open Energy Data Initiative for Solar Data and Analytics (Slides)
Creators: M. Kemal Celik
Publisher: name: IEEE
Year: 2023

With increasing penetrations of PV generation (including other distributed energy resources), future distribution systems, which will be governed by faster dynamics and complex dispatch mechanisms, requiring novel estimation and control of distribution-located assets. Open Energy Data Initiative � System Integration (OEDI-SI) is currently developing key software tools, datasets novel distribution state estimation, control optimization, and transient event analyses. This initiative will enable users to have access to open-source data and algorithms along with ability to incorporate user-specific data to perform distribution-level analyses. More specifically, the focus of the effort is on developing distribution system state estimation (DSSE), distribution optimal power flow (D-OPF), and transient event analysis. In this tutorial we will provide an overview and hands-on training on utilizing the tools developed in OEDI-SI by multiple National Labs and DOE.

With increasing penetrations of PV generation (including other distributed energy resources), future distribution systems, which will be governed by faster dynamics and complex dispatch mechanisms, requiring novel estimation and control of distribution-located assets. Open Energy Data Initiative - System Integration (OEDI-SI) is currently developing key software tools, datasets novel distribution state estimation, control optimization, and transient event analyses. This initiative will enable users to have access to open-source data and algorithms along with ability to incorporate user-specific data to perform distribution-level analyses. More specifically, the focus of the effort is on developing distribution system state estimation (DSSE), distribution optimal power flow (D-OPF), and transient event analysis. In this tutorial we will provide an overview and hands-on training on utilizing the tools developed in OEDI-SI by multiple National Labs and DOE.
ALMA $\mathrm{^{13}CO}$(J=1-0) Observations of NGC 604 in M33: Physical Properties of Molecular Clouds
Creators: name: Phiri, S. P.
name: Kirk, J. M.
name: Ward-Thompson, D.
name: Sansom, A. E.
name: Bendo, G. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of $\mathrm{^{13}CO(J=1-0)}$ line and 104 GHz continuum emission from NGC 604, a giant HII region (GHR) in the nearby spiral galaxy M33. Our high spatial resolution images ( 3.2"$\times$ 2.4", corresponding to $13 \times 10$ pc physical scale) allow us to detect fifteen molecular clouds. We find spatial offsets between the $^{13}CO$ and 104 GHz continuum emission and also detect continuum emission near the centre of the GHR. The identified molecular clouds have sizes ranging from 5-21 pc, linewidths of 0.3-3.0 $\mathrm{kms^{-1}}$ and luminosity-derived masses of (0.4-80.5) $\times 10^3$ M$_{\bigodot}$. These molecular clouds are in near virial equilibrium, with a spearman correlation coefficient of 0.98. The linewidth-size relationship for these clouds is offset from the corresponding relations for the Milky Way and for NGC 300, although this may be an artefact of the dendrogram process.
description: The article has 9 pages, 7 figures and 1 table
Secure Outage Analysis of FSO Communications Over Arbitrarily Correlated Málaga Turbulence Channels
Creators: name: Ai, Yun
name: Mathur, Aashish
name: Kong, Long
name: Cheffena, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we analyze the secrecy outage performance for more realistic eavesdropping scenario of free-space optical (FSO) communications, where the main and wiretap links are correlated. The FSO fading channels are modeled by the well-known Málaga distribution. Exact expressions for the secrecy performance metrics such as secrecy outage probability (SOP) and probability of the non zero secrecy capacity (PNZSC) are derived, and asymptotic analysis on the SOP is also conducted. The obtained results reveal useful insights on the effect of channel correlation on FSO communications. Counterintuitively, it is found that the secrecy outage performance demonstrates a non-monotonic behavior with the increase of correlation. More specifically, there is an SNR penalty for achieving a target SOP as the correlation increases within some range. However, when the correlation is further increased beyond some threshold, the SOP performance improves significantly.
description: 6 pages, 5 figures
Soft robotic suits: State of the art, core technologies and open challenges
Creators: name: Xiloyannis, Michele
name: Alicea, Ryan
name: Georgarakis, Anna-Maria
name: Haufe, Florian L.
name: Wolf, Peter
name: Masia, Lorenzo
name: Riener, Robert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Wearable robots are undergoing a disruptive transition, from the rigid machines that populated the science-fiction world in the early eighties to lightweight robotic apparel, hardly distinguishable from our daily clothes. In less than a decade of development, soft robotic suits have achieved important results in human motor assistance and augmentation. In this paper, we start by giving a definition of soft robotic suits and proposing a taxonomy to classify existing systems. We then critically review the modes of actuation, the physical human-robot interface and the intention-detection strategies of state of the art soft robotic suits, highlighting the advantages and limitations of different approaches. Finally, we discuss the impact of this new technology on human movements, for both augmenting human function and supporting motor impairments, and identify areas that are in need of further development.
description: Accepted as a Survey Paper on IEEE Transaction on Robotics
Basics of Digital Low-Dropout (LDO) Integrated Voltage Regulator Slides and Transcript
Creators: Mingoo Seok
Publisher: name: IEEE
Year: 2020

2020 ISSCC Tutorials
Abstract: Systems-on-chips incorporate integrated low-dropout (LDO) voltage regulators (VRs) to improve energy efficiency by allowing each core on a shared input voltage rail to operate at a unique voltage. LDOs enable compact size, low cost, and relatively simple integration. This tutorial introduces the key trade-offs between analog and digital LDOs and covers the primary specifications. Finally, this tutorial presents a wide range of state-of-the-art digital LDOs while highlighting the key design trade-offs.
The Tensor Part of the Skyrme Energy Density Functional
Creators: name: Lesinski, Thomas
name: Bender, Michael
name: Bennaceur, Karim
name: Duguet, Thomas
name: Meyer, Jacques
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We systematically study the effect of the J^2 tensor terms in the Skyrme energy functional on properties of spherical nuclei. We build a set of 36 parameterizations covering a wide range of the corresponding parameter space. We analyze the impact of the tensor terms on the evolution of single-particle-level splittings along chains of semi-magic nuclei in spherical calculations. We find that positive values of the coupling constants of proton-neutron and like-particle tensor terms allow for a qualitative description of the evolution of neutron and proton single-particle level splittings in chains of Ca, Ni and Sn isotopes.
description: 3pages, 1 figure; Proceedings of the INPC2007, June 3-8, 2007, Tokyo, Japan
Impact of the Sound of Magnetic Resonance Imaging Pulse Sequences in Awake Mice
Creators: name: Almeida, Joana
name: Severo, Frederico
name: Nunes, Daniel
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Magnetic resonance imaging (MRI) is a research field of high interest as the implementation of new imaging modalities can significantly improve clinical diagnosis of several human pathologies. Awake nonhuman animals in the laboratory are being used in MRI pre-clinical systems for the validation of new imaging techniques, but animal welfare concerns emerge as MRI pulse sequences produce extremely loud sounds, up to 120 dB. Consequently, it is unclear how stressful these sounds are to the animals. Here, the impact of these sounds in the rodent behavior and physiology was evaluated. To achieve this, C57BL6/J mice were divided into two groups: a group exposed to sounds of typical pulse sequences used in imaging and a control group that was not exposed to those sounds. Mice have been tested in the open field and elevated plus maze to monitor baseline behavior and a hormonal stress biomarker was assayed to assess acute stress. The results indicate that the pulse sequences used in MRI are transient stressors that overall do not impact the behavioral status of the animals.
Two-point correlation function of the fractional Ornstein-Uhlenbeck process
Creators: name: Baule, A.
name: Friedrich, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We calculate the two-point correlation function for a subdiffusive continuous time random walk in a parabolic potential, generalizing well-known results for the single-time statistics to two times. A closed analytical expression is found for initial equilibrium, revealing a clear deviation from a Mittag-Leffler decay.
description: 6 pages, 2 figures; Journal's website can be found at http://www.epljournal.org