cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Addis Ababa light railway is one of the newly constructing railway transport system in Ethiopia. Urban rail plays a key role in the sustainable development of metropolitan areas for several reasons such as its high capacity, energy efficiency and lack of local air pollution. Electricity has become the primary source of traction power in modern railways. DC-electrification is often used for urban public transport. Most electric trains in DC-electrified railways are presently equipped with regenerative braking system. Regenerative braking is a means to save energy and reduce maintenance costs in railway industry. Ultra-capacitor is a major promising alternative of energy storage technologies in the urban rail system. Compared to other storage technology, the ultra-capacitor has the advantages of rapid charging and discharging frequencies, a long cycle life and high power density, which highly match the characteristics of urban rail transit such as short running time between stations, frequent accelerating and braking and booming power within a short time.
Creators: name: Dadi, Michael Moreda
Publisher: name: Zenodo
Year: 2014

description: Leather industry occupies a place of prominence in Ethiopian economy in view of its massive potential for employment, growth and export. The need of import substituting leather processing chemicals from locally available feed stocks is an urgent matter both from economic and environmental point of view. One of the chemicals used in leather processing is ammonium chloride which is a deliming agent in Beam house operation. In this study, the production of ammonium chloride from proven available urea feed stocks ammonia, carbon dioxide and from the cheapest chlorine source sodium chloride which is readily available in Ethiopia, and its use and efficiency as a deliming chemical as compared to standard ammonium chloride is analyzed
Modeling an elastic beam with piezoelectric patches by including magnetic effects
Creators: name: Ozer, A. O.
name: Morris, K. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Physics (physics.class-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35M32, 93D15, 70Q05

description: Models for piezoelectric beams using Euler-Bernoulli small displacement theory predict the dynamics of slender beams at the low frequency accurately but are insufficient for beams vibrating at high frequencies or beams with low length-to-width aspect ratios. A more thorough model that includes the effects of rotational inertia and shear strain, Mindlin-Timoshenko small displacement theory, is needed to predict the dynamics more accurately for these cases. Moreover, existing models ignore the magnetic effects since the magnetic effects are relatively small. However, it was shown recently \cite{O-M1} that these effects can substantially change the controllability and stabilizability properties of even a single piezoelectric beam. In this paper, we use a variational approach to derive models that include magnetic effects for an elastic beam with two piezoelectric patches actuated by different voltage sources. Both Euler-Bernoulli and Mindlin-Timoshenko small displacement theories are considered. Due to the magnetic effects, the equations are quite different from the standard equations.
description: 3 figures. 2014 American Control Conference Proceedings
A preliminary study of the impact of stocking density on the behaviour of group housed Göttingen Minipigs
Creators: name: Krohn, Thomas C
name: Ellegaard, Lars
name: Hansen, Axel Kornerup
Publisher: name: Scandinavian Journal of Laboratory Animal Sciences
Year: 2014

description: In welfare discussions the space available for each animal has been in focus for many years. It is, however, difficult to carry out experiments, which end up setting precise data for minimum space. Experimental setups have to some extent investigated the space demands for rodents, guinea pigs and rabbits (Eveleigh, 1988; Stauffacher, 1992; White et al., 1989), while only little work has been done on minipigs. Some studies have been carried out on farm pigs to show the minimum welfare-acceptable space for a pig at fifteen kg, but data differ. Beattie et al. (1996) found the optimal floor area to be 0.5 m2 per pig, whereas Pearce & Paterson (1993) only found it to be 0.18 m2 per pig. As minipigs in general are more active than farm pigs (Bollen et al., 1998), they may need more space than farm pigs at the same size. The aim of the present study was to find a method to evaluate the minimum welfare-acceptable floor space required for each group housed pig. Behavioural studies are used to discuss whether pigs’s welfare and ability to perform a natural behavioural repertoire are reduced under certain housing conditions.
description: Scandinavian Journal of Laboratory Animal Sciences, Vol 27, No 4 (2000)
Feeding and rearing techniques used for larvae of Pleurodeles waltl (urodele amphibian) onboard the MIR space station
Creators: name: Durand, Danielle
name: Tankosic, Christiane
name: Chaput, Didier
name: Gualandris-Parisot, Lydie
name: Membre, Hervé
name: Bautz, Alain
name: Dournon, Christian
Publisher: name: Scandinavian Journal of Laboratory Animal Sciences
Year: 2014

description: A research group in our laboratories works on development of amphibians under microgravity conditions. Several experiments were performed in space conditions using embryos or adults of the urodele amphibian, Pleurodeles waltl (Bautz et al., 1995; Dournon et al., 1997; Husson et al., 1998; Duprat et al., 1998; Aimar et al., 2000). In 1999, for the so-called Perseus French space mission onboard the MIR space station, the project was to rear embryos and larvae of Pleurodeles waltl in microgravity conditions to study the appearance and evolution of otoconia in the inner ear (Oukda et al., 1999a and b). The present paper reports the technique used to feed and rear Pleurodeles larvae in microgravity conditions with the assistance of a cosmonaut.
description: Scandinavian Journal of Laboratory Animal Sciences, Vol 27, No 4 (2000)
HSI-MSER: hyperspectral image registration algorithm based on MSER and SIFT
Creators: name: Ordóñez, Álvaro
name: Acción, Álvaro
name: Argüello, Francisco
name: B. Heras, Dora
Publisher: name: Zenodo
Year: 2021
Subjects: hyperspectral imaging
image registration
MSER
SIFT
remote sensing

description: This a pre-print of the article "HSI-MSER: Hyperspectral Image Registration Algorithm Based on MSER and SIFT," in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 14, pp. 12061-12072, 2021. The published article is available on https://doi.org/10.1109/JSTARS.2021.3129099.
description: This work was supported in part by Ministerio de Ciencia e Innovación, Government of Spain [grant number PID2019-104834GB-I00], and Consellería de Cultura, Educación e Universidade [grant numbers ED431C 2018/19, and accreditation 2019-2022 ED431G-2019/04]. All are co--funded by the European Regional Development Fund (ERDF). The work of Álvaro Ordóñez was also supported by Ministerio de Universidades, Government of Spain, under a FPU Contract [grant number FPU16/03537]
Dynamical Widom-Rowlinson model and its mesoscopic limit
Creators: name: Finkelshtein, Dmitri
name: Kondratiev, Yuri
name: Kutoviy, Oleksandr
name: Oliveira, Maria Joao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 70F45, 34A34, 37A60

description: We consider the non-equilibrium dynamics for the Widom-Rowlinson model (without hard-core) in the continuum. The Lebowitz-Penrose-type scaling of the dynamics is studied and the system of the corresponding kinetic equations is derived. In the space-homogeneous case, the equilibrium points of this system are described. Their structure corresponds to the dynamical phase transition in the model. The bifurcation of the system is shown.
Multi-component model of learning and its use for research didactic system
Creators: name: Mayer, Robert V
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences
subject: I.6.0
subject: 68U20

description: In computer simulation of the learning process is usually assumed that all elements of the training material are assimilated equally durable. But in practice, the knowledge, which a student uses in its operations, are remembered much better. For a more precise study of didactic systems the multi component model of learning are proposed. It takes into account: 1) the transition of weak knowledge in trustworthy knowledge; 2) the difference in the rate of forgetting the trustworthy and weak knowledge. It is assumed that the rate of increase of student's knowledge is proportional to: 1) the difference between the level of the requirements of teachers and the number of learned knowledge; 2) the amount of learned knowledge, raised to some power. Examples of the use of a multi component model for the study of situations in the learning process are considered, the resulting graphs of the student's level of knowledge of the time are presented. A generalized model of learning, which allows to take into account the complexity of the various elements of the educational material are proposed. The possibility of creating a training program for the training of students of pedagogical institutes are considered.
description: 5 pages, 2 figures, on russian
On the relation between sSFR and metallicity
Creators: name: Pipino, A.
name: Lilly, S. J.
name: Carollo, C. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we present an exact general analytic expression $Z(sSFR)=y/Λ(sSFR)+I(sSFR)$ linking the gas metallicity Z to the specific star formation rate (sSFR), that validates and extends the approximate relation put forward by Lilly et al. (2013, L13), where $y$ is the yield per stellar generation, $Λ(sSFR)$ is the instantaneous ratio between inflow and star formation rate expressed as a function of the sSFR, and $I$ is the integral of the past enrichment history, respectively. We then demonstrate that the instantaneous metallicity of a self-regulating system, such that its sSFR decreases with decreasing redshift, can be well approximated by the first term on the right-hand side in the above formula, which provides an upper bound to the metallicity. The metallicity is well approximated also by the L13 ideal regulator case, which provides a lower bound to the actual metallicity. We compare these approximate analytic formulae to numerical results and infer a discrepancy <0.1 dex in a range of metallicities and almost three orders of magnitude in the sSFR. We explore the consequences of the L13 model on the mass-weighted metallicity in the stellar component of the galaxies. We find that the stellar average metallicity lags 0.1-0.2 dex behind the gas-phase metallicity relation, in agreement with the data. (abridged)
description: 14 pages, 6 figures, MNRAS accepted
Rigorous computation of invariant measures and fractal dimension for piecewise hyperbolic maps: 2D Lorenz like maps
Creators: name: Galatolo, Stefano
name: Nisoli, Isaia
Publisher: name: arXiv
Year: 2014
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37M25

description: We consider a class of piecewise hyperbolic maps from the unit square to itself preserving a contracting foliation and inducing a piecewise expanding quotient map, with infinite derivative (like the first return maps of Lorenz like flows). We show how the physical measure of those systems can be rigorously approximated with an explicitly given bound on the error, with respect to the Wasserstein distance. We apply this to the rigorous computation of the dimension of the measure. We present a rigorous implementation of the algorithms using interval arithmetics, and the result of the computation on a nontrivial example of Lorenz like map and its attractor, obtaining a statement on its local dimension.
description: 30 pages, 5 figures
Absence of Long-Wavelength Cerenkov Radiation With Isotropic Lorentz and CPT Violation
Creators: name: Altschul, Brett
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Modified theories of electrodynamics that include violations of Lorentz symmetry often allow for the possibility of vacuum Cerenkov radiation. This phenomenon has previously been studied in a number of Lorentz-violating theories, but none of the methods that have previously been developed are sufficient to study a theory with a timelike Chern-Simons term $k_{AF}$, because such a term may generate exponentially growing solutions to the field equations. Searching for vacuum Cerenkov radiation in a theory with a purely timelike Chern-Simons term using only elementary methods, we find that, despite the presence of the runaway modes, a charge in uniform nonrelativistic motion does not radiate energy, up to second order in the velocity.
description: 9 pages
ΜΟΧΕ: «Αλεμάνο Ιωαχανάν», τόμ. 2, σ. 120.
Creators: name: Vasileiadis, Pavlos D.
Publisher: name: Zenodo
Year: 2014
Subjects: Ιωαχανάν Αλεμάνο
Yohanan Alemanno
Pavlos Vasileiadis
Παύλος Βασιλειάδης

description: English title: “Yohanan Alemanno,” Encyclopedia ΜΟΧΕ vol. 2, p. 120. ISBN SET 9789608094598
Nature and dynamics of overreflection of Alfven waves in MHD shear flows
Creators: name: Gogichaishvili, D.
name: Chagelishvili, G.
name: Chanishvili, R.
name: Lominadze, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Our goal is to gain new insights into the physics of wave overreflection phenomenon in MHD nonuniform/shear flows changing the existing trend/approach of the phenomenon study. The performed analysis allows to separate from each other different physical processes, grasp their interplay and, by this way, construct the basic physics of the overreflection in incompressible MHD flows with linear shear of mean velocity, ${\bf U}_0=(Sy,0,0)$, that contain two different types of Alfv${\rm \acute{e}}$n waves. These waves are reduced to pseudo- and shear shear-Alfv${\rm \acute{e}}$n waves when wavenumber along $Z$-axis equals zero (i.e., when $k_z=0$). Therefore, for simplicity, we labelled these waves as: P-Alfv${\rm \acute{e}}$n and S-Alfv${\rm \acute{e}}$n waves (P-AWs and S-AWs). We show that: (1) the linear coupling of counter-propagating waves determines the overreflection, (2) counter-propagating P-AWs are coupled with each other, while counter-propagating S-AWs are not coupled with each other, but are asymmetrically coupled with P-AWs; S-AWs do not participate in the linear dynamics of P-AWs, (3) the transient growth of S-AWs is somewhat smaller compared with that of P-AWs, (4) the linear transient processes are highly anisotropic in wave number space, (5) the waves with small streamwise wavenumbers exhibit stronger transient growth and become more balanced, (6) maximal transient growth (and overreflection) of the wave energy occurs in the two-dimensional case -- at zero spanwise wavenumber. To the end, we analyze nonlinear consequences of the described anisotropic linear dynamics -- they should lead to an anisotropy of nonlinear cascade processes significantly changing their essence, pointing to a need of revisiting the existing concepts of cascade processes in MHD shear flows.
description: 19 pages, 13 figures, submitted to the Journal of Plasma Physics
Alcoholics Anonymous; the story of how more than 100 men have recovered from alcoholism. [CAAAL 688]
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 1941

description: A review of the "Big Book" on a McBee punchcard from the Classified Abstract Archive of the Alcohol Literature (CAAAL), a collection of approximately 20,000 abstracts prepared by Center staff from 1939 through 1977.
Low coverage surface diffusion in complex energy landscapes: Analytical solution and application to intercalation in topological insulators
Creators: name: Gosalvez, Miguel A.
name: Otrokov, Mikhail M.
name: Ferrando, Nestor
name: Ryabishchenkova, Anastasia G.
name: Ayuela, Andres
name: Echenique, Pedro M.
name: Chulkov, Eugene V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A general expression is introduced for the tracer diffusivity in complex periodic energy landscapes with more than one distinct hop rate in two- and three-dimensional diluted systems (low coverage, single-tracer limit). For diffusion in two dimensions, a number of formulas are presented for complex combinations of hop rates in systems with triangular, rectangular and square symmetry. The formulas provide values in excellent agreement with Kinetic Monte Carlo simulations, concluding that the diffusion coefficient can be directly determined from the proposed expressions without performing such simulations. Based on the diffusion barriers obtained from first principles calculations and a physically-meaningful estimate of the attempt frequencies, the proposed formulas are used to analyze the diffusion of Cu, Ag and Rb adatoms on the surface and within the van der Waals (vdW) gap of a model topological insulator, Bi$_{2}$Se$_{3}$. Considering the possibility for adsorbate intercalation from the terraces to the vdW gaps at morphological steps, we infer that, at low coverage and room temperature: (i) a majority of the Rb atoms bounce back at the steps and remain on the terraces, (ii) Cu atoms mostly intercalate into the vdW gap, the remaining fraction staying at the steps, and (iii) Ag atoms essentially accumulate at the steps and gradually intercalate into the vdW gap. These conclusions are in good qualitative agreement with previous experiments.
Theory of dipolaron solutions
Creators: name: Bolmatov, Dima
name: Bastrukov, S.
name: Lai, P. Y.
name: Molodtsova, I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A fundamental task of statistical physics is to predict the system's statistical properties and compare them with observable data. We formulate the theory of dipolaron solutions and analyze the screening effects for permanent and field-induced dipolarons. The mathematical treatment of the collective behaviour and microscopical morphology of dipolaron solutions are discussed. The presented computations show that the electric field shielding of dipolarons in dielectric nanosolutions is quite different from that of counterionic nano-complexes of Debye-Hückel theory of electrolytes. The limiting case of screening length $λ=0$ in dipolaron solutions corresponds to Coulomb's law for the potential and field of uniformly charged sphere.
description: 5 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1109.4369
Eesti ravijuhend „Epilepsia käsitlus fertiilses eas naistel ja rasedatel“
Creators: name: Rakitin, Aleksei
name: Vaher, Ulvi
name: Kirss, Anne
name: Saar, Marika
name: Kallavus, Kadi
Publisher: name: Eesti Arst
Year: 2022

description: Eesti Arst 2022; 101(11):644–647
description: Eesti Arst, 2022: November
Paratsentraalne akuutne keskmiste kihtide makulopaatia ehk silmapõhja isheemia võrkkesta sügavama kapillaaristiku tasemel – haigusjuhu kirjeldus
Creators: name: Toming, Aap
Publisher: name: Eesti Arst
Year: 2022

description: Võrkkesta arteriaalset infarkti on hiljutiste uuringute valguses seostatud ajuinfarkti suurenenud riskiga ja seetõttu on soovitatud silmapõhja arteriaalse isheemia värske leiu korral kiiresti alustada ravi antikoagulantidega. Võrkkesta infarktidel on erinevaid vorme. Artiklis on kirjeldatud võrkkesta keskmiste kihtide paratsentraalse akuutse makulopaatiaga haigusjuhtu. See on oftalmoloogias võrdlemisi uus diagnoos, mida iseloomustab samuti võrkkesta isheemia.
description: Eesti Arst, 2022: November
Mitteinvasiivse ajustimulatsiooni meetodite kasutamine depressiooni ravis kombinatsioonis standardmeetoditega
Creators: name: Kivilo, Ella
Publisher: name: Eesti Arst
Year: 2022

description: Depressioon on üks levinuimatest vaimse tervise probleemidest maailmas, mille puhul ligi kolmandik patsientidest ei saa standardravist, s.t farmakoteraapiast ja tõenduspõhisest psühhoteraapiast piisavat abi. Tõhusa ravimeetodina on end tõestanud korduv transkraniaalne magnetstimulatsioon ja transkraniaalne alalisvoolustimulatsioon, mille abil on võimalik elektrivoolu või magnetvälja toimel välispidi mõjutada depressiooniga seotud ajupiirkondi. Meetodite eelisteks on turvalisus, hea talutavus, paralleelne kasutatavus uurimismeetoditega (elektroentsefalograafia ja magnetresonantstomograafia) ning kombineerimise võimalus teiste ravimeetoditega. Korduvat transkraniaalset magnetstimulatsiooni ja transkraniaalset alalisvoolustimulatsiooni on maailmas depressiooni ravis kasutatud juba aastaid ning lähiaastatel võiks oodata mõlema meetodi kasutamise osakaalu suurenemist ka Eestis.
description: Eesti Arst, 2022: November
Separate Constraints on Early and Late Cosmology
Creators: name: Audren, Benjamin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Since the public release of Planck data, several attempts have been made to explain the observed small tensions with other data-sets, most of them involving an extension of the ΛCDM Model. We try here an alternative approach to the data analysis, based on separating the constraints coming from the different epochs in cosmology, in order to assess which part of the Standard Model generates the tension with the data. To this end, we perform a particular analysis of Planck data probing only the early cosmological evolution, until the time of photon decoupling. Then, we utilise this result to see if the ΛCDM model can fit all observational constraints probing only the late cosmological background evolution, discarding any information concerning the late perturbation evolution. We find that all tensions between the datasets are removed, suggesting that our standard assumptions on the perturbed late-time history, as well as on reionisation, could sufficiently bias our parameter extraction and be the source of the alleged tensions.
description: 6 pages, 3 figures
Data from: Cadaveric emergency cricothyrotomy training for non-surgeons using a bronchoscopy-enhanced curriculum
Creators: name: Maloney, Jim
Publisher: name: Zenodo
Year: 2023
Subjects: cricothyrotomy
procedural education
bronchoscopy

description: Emergency cricothyrotomy training for non-surgeons providing critical care is important as rare "cannot intubate or oxygenate events" may occur multiple times in a provider's career when surgical expertise is not immediately available. However, such training is highly variable and often infrequent so enhancing these experiences is important. Our study was performed after implementing a program to train non-surgeon providers on cadaveric donors. Standard training with an instructional video and live coaching was enhanced by bronchoscopic visualization of the trachea allowing participants to review their technique after performing scalpel and Seldinger-technique procedures, and to review their colleagues' technique on live video. Feasibility was measured through assessing helpfulness for trainees, cost, setup time, quality of images, and operator needs. Footage from the bronchoscopy recordings was analyzed to assess puncture-to-tube time and errors. Participants submitted pre- and post-session surveys assessing their levels of experience and gauging their confidence and anxiety with cricothyrotomies. We found our training program met feasibility criteria for low costs, setup time, and operator needs. Furthermore, all 24 participants rated the cadaveric session as helpful and demonstrated efficient technique by puncture-to-tube times. Bronchoscopy videos revealed that sharp instrument puncturing of the posterior tracheal wall was common and that improper tube placement occurred but was uncommon. Bronchoscopic enhancement was rated as quite or extremely helpful for visualizing the trachea and to assess depth of instrumentation. There was a significant increase in confidence and decrease in performance anxiety after the session. Our findings confirm that supplementing cadaveric emergent cricothyrotomy training programs with tracheal bronchoscopy is feasible, helpful to trainees, meets prior documented times for efficient technique, and detects technical errors that would have been missed in a standard training program. Bronchoscopic enhancement is a valuable addition to cricothyrotomy cadaveric training programs and may help avoid real-life complications.
description: Videos are best viewed on free VLC software (for MPEG files), Microsoft browsers (for Avi files), or free DICOM RadiAnt software (open source).Funding provided by: University of Colorado Denver
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100010346
Award Number: Rymer Award 2019
description: 1. Video files created by Ambu® monitors 2. Data in excel table from individual trainee survey repsonses to questions.
The frequency of planetary debris around young white dwarfs
Creators: name: Koester, Detlev
name: Gänsicke, Boris T.
name: Farihi, Jay
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: (Abridged) We present the results of the first unbiased survey for metal pollution among H-atmosphere (DA) white dwarfs with cooling ages of 20-200 Myr and 17000K < Teff < 27000K, using HST COS in the far UV between 1130 and 1435 A. The atmospheric parameters and element abundances are determined using theoretical models, which include the effects of element stratification due to gravitational settling and radiative levitation. We find 48 of the 85 DA white dwarfs studied, or 56% show traces of metals. In 25 stars, the elements can be explained by radiative levitation alone, although we argue that accretion has very likely occurred recently. The remaining 23 white dwarfs (27%) must be currently accreting. Together with previous studies, we find no accretion rate trend in cooling age from ~40 Myr to ~2 Gyr. The median, main sequence progenitor of our sample corresponds to a star of ~2 Msun, and we find 13 of 23 white dwarfs descending from 2-3 Msun late B- and A-type stars to be currently accreting. Only one of 14 targets with Mwd > 0.8 Msun is found to be currently accreting, which suggests a large fraction are double-degenerate mergers, and the merger discs do not commonly reform large planetesimals or otherwise pollute the remnant. We reconfirm our previous finding that two white dwarf Hyads are currently accreting rocky debris. At least 27%, and possibly up to ~50%, of all white dwarfs with cooling ages 20-200 Myr are accreting planetary debris. At Teff > 23000K, the luminosity of white dwarfs is likely sufficient to vaporize circumstellar dust, and hence no stars with strong metal-pollution are found. However, planetesimal disruption events should occur in this cooling age and Teff range as well, and likely result in short phases of high mass transfer rates. It appears that the formation of rocky planetary material is common around 2-3 Msun late B- and A-type stars.
description: Accepted by A&A
Tõenduspõhine lähenemine neonataalabi korraldusele Eestis
Creators: name: Toome, Liis
name: Metsvaht, Tuuli
name: Einberg, Ülle
name: Tillmann, Vallo
name: Saik, Pille
name: Ilmoja, Mari-Liis
name: Eelmäe, Imbi
name: Laan, Mari
name: Pruunsild, Chris
name: Varendi, Heili
Publisher: name: Eesti Arst
Year: 2022

description: Peri- ja neonataalabi ravitulem sõltub riigi rikkuse ja sotsiaalse arengu ning meditsiinitehnoloogia kättesaadavuse ja meditsiinimeeskonna pädevuse kõrval peri- ja neonataalabi organisatoorsest korraldusest. Peri- ja neonatoloogia on meditsiini valdkond, kus planeerimisel, organisatsioonil ja keskuste vastastikusel seotusel on tugevaim mõju pakutava abi kvaliteedile. Artiklis on antud ülevaade Eesti peri- ja neonataalabi senistest ravitulemustest, tugevatest ja nõrkadest külgedest ning üldtunnustatud tõenduspõhistest tervishoiukorralduslikest põhimõtetest. Esitatud on artikli autorite vaated edasise peri- ja neonataalabi korralduse kohta Eestis.
description: Eesti Arst, 2022: November
Evolution of Anisotropic In-plane Resistivity with doping level in Ca$_{1-x}$Na$_x$Fe$_2$As$_2$ Single Crystals
Creators: name: Ma, J. Q.
name: Luo, X. G.
name: Cheng, P.
name: Zhu, N.
name: Liu, D. Y.
name: Chen, F.
name: Ying, J. J.
name: Wang, A. F.
name: Lu, X. F.
name: Lei, B.
name: Chen, X. H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We measured the in-plane resistivity anisotropy in the underdoped Ca$_{1-x}$Na$_x$Fe$_2$As$_2$ single crystals. The anisotropy (indicated by $ρ_{\rm b} - ρ_{\rm a}$) appears below a temperature well above magnetic transition temperature $T_{\rm N}$, being positive ($ρ_{\rm b} - ρ_{\rm a} > 0$) as $x\leq$ 0.14. With increasing the doping level to $x$ = 0.19, an intersection between $ρ_{\rm b}$ and $ρ_{\rm a}$ is observed upon cooling, with $ρ_{\rm b} - ρ_{\rm a} < 0$ at low-temperature deep inside a magnetically ordered state, while $ρ_{\rm b} - ρ_{\rm a}> 0$ at high temperature. Subsequently, further increase of hole concentration leads to a negative anisotropy $ρ_{\rm b} - ρ_{\rm a} < 0$ in the whole temperature range. These results manifest that the anisotropic behavior of resistivity in the magnetically ordered state depends strongly on the competition of the contributions from different mechanisms, and the competition between the two contributions results in a complicated evolution of the anisotropy of in-plane resistivity with doping level.
description: 7 pages, 6 figures
VAULT context variability (Alt et al., 2025)
Creators: name: Alt, Mary
name: Mettler, Heidi M.
name: Schiff, Elissa S.
name: Evans-Reitz, Nora
name: Burton, Rebecca
name: Cretcher, Sarah R.
name: Staib, Allison
Publisher: name: ASHA journals
Year: 2025
Subjects: classificationCode: 470402
subject: Child language acquisition
classificationCode: 420110
subject: Speech pathology
classificationCode: 520405
subject: Psycholinguistics (incl. speech production and comprehension)

description: Purpose: The purpose of this study was to determine if the Vocabulary Acquisition and Usage for Late Talkers (VAULT) intervention could be efficaciously applied to a new treatment target: words a child neither understood nor said. We also assessed whether the type of context variability used to encourage semantic learning (i.e., action or object) would affect learning outcomes.Method: Nineteen primarily English-speaking late-talking toddlers received 8 weeks of VAULT intervention. They were quasirandomly assigned to a condition that highlighted either object or action variability. Individual effect sizes were calculated for target (treated) and control (not treated) words for each child. These were combined to assess group-level comparisons of treatment efficacy and treatment conditions. Generalization of the word-learning ability was assessed by comparing rates of learning on a vocabulary checklist prior to and during intervention. Bayesian statistics (e.g., t tests, analysis of variance) were used for the analyses.Results: There was strong evidence for a treatment effect showing that children produced more target than control words and moderate evidence that they understood more target than control words. There was strong evidence for generalization. Children learned an average of 6.8 words per week during treatment. There was anecdotal evidence for no difference between treatment conditions.Conclusions: VAULT, with a focus on context variability, can be used efficaciously to teach children to say words they do not understand at the start of treatment. The effects were most pronounced in the generalization data. Additionally, children were able to learn later-acquired words.Supplemental Material S1. Additional methodological details.Supplemental Material S2. Details of analysis plan.Supplemental Material S3. Individual child performance on unique number of target and control words produced during the baseline and treatment phases.Alt, M., Mettler, H. M., Schiff, E. S., Evans-Reitz, N., Burton, R., Cretcher, S. R., & Staib, A. (2025). Not all planes have propellers: Using context variability to treat word learning in late talkers with the Vocabulary Acquisition and Usage for Late Talkers protocol. Journal of Speech, Language, and Hearing Research, 68(2), 579–601. https://doi.org/10.1044/2024_JSLHR-24-00410
Selected Topics in Heavy Flavour Physics
Creators: name: Lenz, Alexander
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We review the status of flavour physics in spring 2014. The numerous accurate new measurements of flavour experiments have enabled us to test our theoretical understanding of flavour processes with an unprecedented precision. At first sight the dominant amount of measurements seems to be standard model like. Having a closer look one finds, however, that in most of the observables there is still some considerable space for new effects. In addition many discrepancies are still not settled yet. For further investigations and definite conclusions an improvement of the theoretical precision as well as the experimental one is mandatory.
description: Invited topical review for JPhysG, 31 pages, 6 figures
Depressiooni sümptomite olemasolu ja sellega seotud tegurid Eestis aastal 2021: rahvastikupõhise COVID-19-kiiruuringu tulemused
Creators: name: Kender, Elisa
name: Vorobjov, Sigrid
name: Reile, Rainer
name: Innos, Kaire
name: Nurk, Eha
name: Laidra, Kaia
name: Tamson, Merili
Publisher: name: Eesti Arst
Year: 2022

description: Taust ja eesmärk. Vaimse tervise probleemid põhjustavad olulist rahvastiku tervisekadu nii Eestis kui ka mujal maailmas. Seoses COVID-19-pandeemiaga on depressiooni ja teiste vaimsete häirete esinemine sagenenud. Töö eesmärk on kirjeldada depressiooni sümptomite levimust täiskasvanud Eesti elanike hulgas ning analüüsida selle seoseid tervise ja koroonaviirushaigusega seotud teguritega. Metoodika. Töö põhineb Tervise Arengu Instituudi (TAI) 2021. aasta kevadel (13.04.–05.05.2021) korraldatud uuringu andmetel. Küsitlusele vastas 3604 inimest, uuringu vastamismäär oli 35%. Analüüsi kaasati 3557 vastaja andmed. Depressiooni sümptomite esinemist hinnati emotsionaalse enesetunde küsimustiku (EEK-2) abil. Arvutati levimus ja logistilise regressioonanalüüsi abil leiti kohandatud šansisuhted (adjusted odds ratio, AOR) koos 95% usaldusvahemikega. Tulemused. Viimase kuu jooksul oli depressiooni sümptomeid esinenud 18,6%-l vastajatest (95% uv 17,3–20,0). Depressiooni sümptomeid oli COVID-19-pandeemia ajal naistel oluliselt rohkem kui meestel (21,6% vs. 15,2%, AOR = 1,8). Kohandatud analüüsi kohaselt oli depressiooni sümptomite esinemise šanss oluliselt suurem noorematel täiskasvanutel võrreldes 70–81aastastega (nt 20–29aastastel AOR = 12,0; 30–39aastastel AOR = 6,0 ja 30–39aastastel AOR = 3,8). Depressiooni sümptomite kogemise šanss oli oluliselt suurem kehvema elujärjega, töötutel ja mittetöötavatel ning üksi elavatel vastajatel, samuti neil, kellel oli kehvem tervise enesehinnang, vähem lähedasi, kellele mure korral toetuda, ning neil, kes tarvitasid alkoholi tervist ohustavas koguses ja suitsetasid aeg-ajalt tava- või e-sigarette. Järeldused. Ligikaudu iga viies inimene oli viimase kuu jooksul kogenud depressiooni sümptomeid. Ennetustegevustes tuleks suuremat tähelepanu suunata eelkõige naistele, noorematele vanuserühmadele, väiksema sotsiaalse tugivõrgustiku ning kehvema elujärjega isikutele.
description: Eesti Arst, 2022: November
Schatten classes on compact manifolds: Kernel conditions
Creators: name: Delgado, Julio
name: Ruzhansky, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper we give criteria on integral kernels ensuring that integral operators on compact manifolds belong to Schatten classes. A specific test for nuclearity is established as well as the corresponding trace formulae. In the special case of compact Lie groups, kernel criteria in terms of (locally and globally) hypoelliptic operators are also given.
description: 22 pages
Painlevé IV Coherent States
Creators: name: Bermudez, David
name: Contreras-Astorga, Alonso
name: C, David J. Fernández
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A simple way to find solutions of the Painlevé IV equation is by identifying Hamiltonian systems with third-order differential ladder operators. Some of these systems can be obtained by applying supersymmetric quantum mechanics (SUSY QM) to the harmonic oscillator. In this work, we will construct families of coherent states for such subset of SUSY partner Hamiltonians which are connected with the Painlevé IV equation. First, these coherent states are built up as eigenstates of the annihilation operator, then as displaced versions of the extremal states, both involving the third-order ladder operators, and finally as extremal states which are also displaced but now using the so called linearized ladder operators. To each SUSY partner Hamiltonian corresponds two families of coherent states: one inside the infinite subspace associated with the isospectral part of the spectrum and another one in the finite subspace generated by the states created through the SUSY technique.
description: 26 pages, 4 figures
Emergent Fractional Charge and Multiple Majoranas
Creators: name: Jackiw, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: To mark the 111th birthday of Eugene Wigner, we review topological excitations in diverse dimensions.
description: 7 pages, 3 pdf figures, pdflatex
Out-of-equilibrium Baryogenesis and SuperWIMP Dark Matter
Creators: name: Arcadi, Giorgio
name: Covi, Laura
name: Nardecchia, Marco
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The experimental fact that the energy density in Dark Matter and in Baryons is of the same order is one of the most puzzling in cosmology. In this letter we suggest a new mechanism able to explain this coincidence in the context of out-of-equilibrium baryogenesis with DM production "à la" SuperWIMP starting from the same initial particle. We then discuss two simple implementations of this scenario within supersymmetric models with gravitino DM.
description: 5 pages, 3 figures
Optical spin injection in graphene with Rashba spin-orbit interaction
Creators: name: Inglot, M.
name: Dugaev, V. K.
name: Sherman, E. Ya.
name: Barnaś, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the efficiency of infrared optical spin injection in single-layer graphene with Rashba spin-orbit coupling and for in-plane magnetic field. The injection rate in the photon frequency range corresponding to the Rashba splitting is shown to be proportional to the ratio of the Zeeman and Rashba splittings. As a result, large spin polarization can be controllably achieved for experimentally available values of the spin-orbit coupling and in magnetic fields below 10 Tesla.
description: 5 pages, 3 figures
Nonparaxial shape-preserving Airy beams with Bessel signature
Creators: name: Zapata-Rodriguez, Carlos J.
name: Naserpour, Mahin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Spatially accelerating beams that are solutions to the Maxwell equations may propagate along incomplete circular trajectories, after which diffraction broadening takes over and the beams spread out. Taking these truncated Bessel wave fields to the paraxial limit, some authors sustained that it is recovered the known Airy beams (AiBs). Based on the angular spectrum representation of optical fields, we demonstrated that the paraxial approximation rigorously leads to off-axis focused beams instead of finite-energy AiBs. The latter will arise under the umbrella of a nonparaxial approach following elliptical trajectories in place of parabolas. Deviations from full-wave simulations appear more severely in beam positioning rather than its local profile.
Design of Field Programmable Gate Array (FPGA) Based Emulators for Motor Control Applications
Creators: name: Achballah, Ahmed Ben
name: Othman, Slim Ben
name: Saoud, Slim Ben
Publisher: name: arXiv
Year: 2013
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Problem Statement: Field Programmable Gate Array (FPGA) circuits play a significant role in major recent embedded process control designs. However, exploiting these platforms requires deep hardware conception skills and remains an important time consuming stage in a design flow. High Level Synthesis technique avoids this bottleneck and increases design productivity as witnessed by industry specialists. Approach: This study proposes to apply this technique for the conception and implementation of a Real Time Direct Current Machine (RTDCM) emulator for an embedded control application. Results: Several FPGA-based configuration scenarios are studied. A series of tests including design and timing-precision analysis were conducted to discuss and validate the obtained hardware architectures. Conclusion/Recommendations: The proposed methodology has accelerated the design time besides it has provided an extra time to refine the hardware core of the DCM emulator. The high level synthesis technique can be applied to the control field especially to test with low cost and short delays newest algorithms and motor models.
Grammar, dimension and deixis in Phola, a Tibeto-Burman language of China
Creators: name: González Pérez, Manuel David
Publisher: name: The Australian National University
Year: 2022

description: Based on 6 months of fieldwork this thesis presents the most important findings of my PhD research on Phola, a previously undocumented language of China that belongs to the Loloish (aka Ngwi) branch of the Tibeto-Burman family. The main focus is on how spatial categories in language not only reflect the external world but also convey subjective, intersubjective and social aspects of human reality. This is examined through two grammatical paradigms that encode dimensional and deictic distinctions, respectively, and whose formal complexities lend themselves particularly well to the investigation of semantic and pragmatic contrasts. It is found that both systems exhibit a back-and-forth between perceptually observable spatial features and non-perceptual ones, a phenomenon that has three main causes. Firstly, dimensional and deictic, categories are semantically underspecified and thus dependent on the context of the speech act. Secondly, there is a communicative pressure for language to accomodate not only perceptual but also non-perceptual aspects of human experience such as attentional states as well as territories of discourse and knowledge. Thirdly, the availability of multiple dimensional and deictic terms in the language allows speakers to emphasise different perspectives, e.g., spatial vs attentional. Understanding these systems requires two main ingredients. First, a basic description of the overall grammatical structures of the Phola language. Second, saturated analyses of pragmatic context, including topographical data, and multimodal cues, such as gestures and eye gaze, which flesh out the meaning of dimensional and deictic expressions. Hence, video recordings are heavily drawn upon throughout this thesis, especially in Chapters 6 to 9, to examine the interaction of spatial, attentional and social factors driving the choice of linguistic forms. The thesis is structured as follows. After a providing some background information on the Phola speech community and the theoretical and methodological underpinnings of this thesis (Part 1), the basic grammar of the language is presented (Part 2) followed by an analysis of formal, semantic and multimodal aspects of the dimensional and deictic paradigms (Part 3). Then, an in-depth pragmatic study of naturalistic deictic usage is presented (Part 4) followed by a summary of findings and future directions for research (Part 5).
Challenges of the Implementation of Balanced Score Card in Ethiopian Insurance Corporation
Creators: name: Lemma, Ruhama
Publisher: name: Zenodo
Year: 2018

description: Organizations compete in a very complex and challenging context that is as a result many factors from globalization, aggressive competitors and rapid change in technology among others. For organizations to gain and maintain a competitive edge they must be able to develop and execute strategic plans with precision. One of the major tools that help achieve this is the balanced score card. The balanced score card was developed in early 1990’s by Kalpan and Norton and was designed to give companies the information needed to effectively manage their business strategy. It has additional perspectives other than the traditional financial perspective which include customer, internal business process and learning and growth. The implementation of the tool however, has been a challenge to many organizations. Hence the main purpose of this study was to determine challenges of the implementation of balanced score card in Ethiopian Insurance Corporation.
Limb-Brightened Jet of 3C 84 Revealed by the 43-GHz Very-Long-Baseline-Array Observation
Creators: name: Nagai, H.
name: Haga, T.
name: Giovannini, G.
name: Doi, A.
name: Orienti, M.
name: D'Ammando, F.
name: Kino, M.
name: Nakamura, M.
name: Asada, K.
name: Hada, K.
name: Giroletti, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a study of sub-pc scale radio structure of the radio galaxy 3C 84/NGC 1275 based on the Very Long Baseline Array (VLBA) data at 43 GHz. We discover a limb-brightening in the "restarted" jet associated with the 2005 radio outburst. In the 1990s, the jet structure was ridge-brightening rather than limb-brightening, despite the observations being done with similar angular resolution. This indicates that the transverse jet structure has changed recently. This change in the morphology shows an interesting agreement with the $γ$-ray flux increase, i.e., the $γ$-ray flux in 1990s was at least seven times lower than the current one. One plausible explanation for the limb-brightening is the velocity structure of the jet in the context of the stratified jet, which is a successful scenario to explain the $γ$-ray emission in some active galactic nuclei (AGNs). If this is the case, the change in apparent transverse structure might be caused by the change in the transverse velocity structure. We argue the possibility that the transition from ridge-brightening to limb-brightening is related to the $γ$-ray time variability on the timescale of decades. We also discuss the collimation profile of the jet.
description: 22 pages, 4 figures, Accepted for Publication in ApJ