cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rotation-Activity Relation of Ca II and Mg I Infrared Emission Lines of Young Stars
Creators: name: Yamashita, Mai
name: Itoh, Yoichi
name: Takagi, Yuhei
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars
stars: activity
stars: chromospheres
stars: pre-main sequence
techniques: spectroscopic

description: To reveal the detail of the internal structure, the relationship between chromospheric activity and the Rossby number, $N_{\rm R}$(= rotational period $P$ / convective turnover time $\tau_{\rm c}$), has been extensively examined for main-sequence stars. The goal of our work is to apply the same methods to pre-main-sequence (PMS) stars and identify the appropriate model of $\tau_{\rm c}$ for them. Yamashita et al. (2020) investigated the relationship between $N_{\rm R}$ and strengths of the Ca I\hspace{-.1em}I infrared triplet ($\lambda 8498, 8542, 8662 $ $\, \mathrm{\angstrom}$) emission lines of 60 PMS stars. Their equivalent widths are converted into the emission line to the stellar bolometric luminosity ratio ($R^{\prime}$). The 54 PMS stars have $N_{\rm R} < 10^{-1.0}$ and show $R^{\prime} \sim 10^{-4.2}$ as large as the maximum $R^{\prime}$ of the zero-age main-sequence (ZAMS) stars. However, because all $R^{\prime}$ was saturated against $N_{\rm R}$, it was not possible to estimate the appropriate $\tau_{\rm c}$ model for the PMS stars. We noticed that Mg I emission lines at $8807.8 \, \mathrm{\angstrom}$ is an optically thin chromospheric line, appropriate for determination of the adequate $\tau_{\rm c}$ for PMS stars. Using the archive data of the AAT/the University College London Echelle Spectrograph, we investigated the Mg I line of 52 ZAMS stars. After subtracting photospheric absorption component, the Mg I line is detected as an emission line in 45 ZAMS stars, whose $R^{\prime}_{\rm Mg I}$ is between $10^{-5.9}$ and $10^{-4.1}$. The Mg I line is not saturated yet in "the saturated regime for the Ca I\hspace{-.1em}I emission lines", i.e. $10^{-1.6} < N_{\rm R} < 10^{-0.8}$. Therefore, the adequate $\tau_{\rm c}$ for PMS stars can be determined by measuring of their $R^{\prime}_{\rm Mg I}$ values.
Noncommutative Inspired Black Holes in Extra Dimensions
Creators: name: Rizzo, Thomas G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent string theory motivated paper, Nicolini, Smailagic and Spallucci (NSS) presented an interesting model for a noncommutative inspired, Schwarzschild-like black hole solution in 4-dimensions. The essential effect of having noncommutative co-ordinates in this approach is to smear out matter distributions on a scale associated with the turn-on of noncommutativity which was taken to be near the 4-d Planck mass. In particular, NSS took this smearing to be essentially Gaussian. This energy scale is sufficiently large that in 4-d such effects may remain invisible indefinitely. Extra dimensional models which attempt to address the gauge hierarchy problem, however, allow for the possibility that the effective fundamental scale may not be far from $\sim$ 1 TeV, an energy regime that will soon be probed by experiments at both the LHC and ILC. In this paper we generalize the NSS model to the case where flat, toroidally compactified extra dimensions are accessible at the Terascale and examine the resulting modifications in black hole properties due to the existence of noncommutativity. We show that while many of the noncommutativity-induced black hole features found in 4-d by NSS persist, in some cases there can be significant modifications due the presence of extra dimensions. We also demonstrate that the essential features of this approach are not particularly sensitive to the Gaussian nature of the smearing employed by NSS.
description: 30 pages, 12 figures; slight text modifications and references added
Recurrent Localization Networks applied to the Lippmann-Schwinger Equation
Creators: name: Kelly, Conlain
name: Kalidindi, Surya R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The bulk of computational approaches for modeling physical systems in materials science derive from either analytical (i.e. physics based) or data-driven (i.e. machine-learning based) origins. In order to combine the strengths of these two approaches, we advance a novel machine learning approach for solving equations of the generalized Lippmann-Schwinger (L-S) type. In this paradigm, a given problem is converted into an equivalent L-S equation and solved as an optimization problem, where the optimization procedure is calibrated to the problem at hand. As part of a learning-based loop unrolling, we use a recurrent convolutional neural network to iteratively solve the governing equations for a field of interest. This architecture leverages the generalizability and computational efficiency of machine learning approaches, but also permits a physics-based interpretation. We demonstrate our learning approach on the two-phase elastic localization problem, where it achieves excellent accuracy on the predictions of the local (i.e., voxel-level) elastic strains. Since numerous governing equations can be converted into an equivalent L-S form, the proposed architecture has potential applications across a range of multiscale materials phenomena.
description: 20 pages, 10 figures. Accepted to Computational Materials Science
MPEC 2024-T112 : 2022 SP5
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
DNA: From rigid base-pairs to semiflexible polymers
Creators: name: Becker, Nils B.
name: Everaers, Ralf
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: The sequence-dependent elasticity of double-helical DNA on a nm length scale can be captured by the rigid base-pair model, whose strains are the relative position and orientation of adjacent base-pairs. Corresponding elastic potentials have been obtained from all-atom MD simulation and from high-resolution structural data. On the scale of a hundred nm, DNA is successfully described by a continuous worm-like chain model with homogeneous elastic properties characterized by a set of four elastic constants, which have been directly measured in single-molecule experiments. We present here a theory that links these experiments on different scales, by systematically coarse-graining the rigid base-pair model for random sequence DNA to an effective worm-like chain description. The average helical geometry of the molecule is exactly taken into account in our approach. We find that the available microscopic parameters sets predict qualitatively similar mesoscopic parameters. The thermal bending and twisting persistence lengths computed from MD data are 42 and 48 nm, respectively. The static persistence lengths are generally much higher, in agreement with cyclization experiments. All microscopic parameter sets predict negative twist-stretch coupling. The variability and anisotropy of bending stiffness in short random chains lead to non-Gaussian bend angle distributions, but become unimportant after two helical turns.
description: 13 pages, 6 figures, 6 tables
Multi-particle decoherence free subspaces in extended systems
Creators: name: Karasik, Raisa I.
name: Marzlin, Karl-Peter
name: Sanders, Barry C.
name: Whaley, K. Birgitta
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop a method to determine spatial configurations to realize decoherence-free subspaces for spatially extended multi-particle systems. We have assumed normal reservoir behavior including translational invariance of the reservoir and preparation in stationary states or mixture thereof and weak Markovian system-reservoir coupling that requires energy transfer. One important outcome of our method is a proof that there does not exist a multi-particle decoherence-free subspace in such systems except in the limit that the spatial extent of the system becomes infinitesimal.
description: 12 pages, 2 figures
One-loop Conformal Invariance of the Type II Pure Spinor Superstring in a Curved Background
Creators: name: Bedoya, Oscar A.
name: Chandia, Osvaldo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the one-loop beta function for the Type II superstring using the pure spinor formalism in a generic supergravity background. It is known that the classical pure spinor BRST symmetry puts the background fields on-shell. In this paper we show that the one-loop beta functions vanish as a consequence of the classical BRST symmetry of the action.
description: 24 pages, harvmac tex, references added to section 1
One star, two star, red star, blue star: an updated planetary nebula central star distance catalogue from Gaia EDR3
Creators: name: Chornay, N.
name: Walton, N. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. Planetary nebulae (PNe) are a brief but important phase of stellar evolution. The study of Galactic PNe has historically been hampered by uncertain distances, but the parallaxes of PN central stars (CSPNe) measured by Gaia are improving the situation. Aims. Gaia's Early Data Release 3 (EDR3) offers higher astrometric precision and greater completeness compared to previous releases. Taking advantage of these improvements requires that the CSPNe in the catalogue be accurately identified. Methods. We applied our automated technique based on the likelihood ratio method to cross match known PNe with sources in Gaia EDR3, using an empirically derived position and colour distribution to score candidate matches. Results. We present a catalogue of over 2000 sources in Gaia EDR3 that our method has identified as likely CSPNe or compact nebula detections. We show how the more precise parallaxes of these sources compare to previous PN statistical distances and introduce an approach to combining them to produce tighter distance constraints. We also discuss Gaia's handling of close companions and bright nebulae. Conclusions. Gaia is unlocking new avenues for the study of PNe. The catalogue presented here will remain valid for the upcoming Gaia Data Release 3 (DR3) and thus provide a valuable resource for years to come.
description: Accepted for publication in A&A. Main text: 5 pages, 4 figures. Appendix contains catalogue with subset of columns; full catalogue to be published on CDS
Evidence for the PSL(2$|$2) Wess-Zumino-Novikov-Witten model as a model for the plateau transition in Quantum Hall effect: Evaluation of numerical simulations
Creators: name: Tsvelik, A. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper I revise arguments in favour of the PSL(2$|$2) Wess-Zumino-Novikov-Witten (WZNW) model as a theory of the plateau transition in Integer Quantum Hall effect. I show that all available numerical data (including the correlation length exponent $ν$) are consistent with the predictions of such WZNW model with the level $k=8$.
description: 11 pages, no figures
Modular Ordinary Differential Equations on ${\rm SL}(2,\mathbb{Z})$ of Third Order and Applications
Creators: name: Chen, Zhijie
name: Lin, Chang-Shou
name: Yang, Yifan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper, we study third-order modular ordinary differential equations (MODE for short) of the following form $y'''+Q_2(z)y'+Q_3(z)y=0$, $z\in\mathbb{H}=\{z\in\mathbb{C} \,|\,\operatorname{Im}z>0 \}$, where $Q_2(z)$ and $Q_3(z)-\frac12 Q_2'(z)$ are meromorphic modular forms on ${\rm SL}(2,\mathbb{Z})$ of weight $4$ and $6$, respectively. We show that any quasimodular form of depth $2$ on ${\rm SL}(2,\mathbb{Z})$ leads to such a MODE. Conversely, we introduce the so-called Bol representation $\hatρ\colon {\rm SL}(2,\mathbb{Z})\to{\rm SL}(3,\mathbb{C})$ for this MODE and give the necessary and sufficient condition for the irreducibility (resp. reducibility) of the representation. We show that the irreducibility yields the quasimodularity of some solution of this MODE, while the reducibility yields the modularity of all solutions and leads to solutions of certain ${\rm SU}(3)$ Toda systems. Note that the ${\rm SU}(N+1)$ Toda systems are the classical Plücker infinitesimal formulas for holomorphic maps from a Riemann surface to $\mathbb{CP}^N$.
Alternating Gradient Focusing and Deceleration of Polar Molecules
Creators: name: Bethlem, Hendrick L.
name: Tarbutt, M. R.
name: Küpper, Jochen
name: Carty, David
name: Wohlfart, Kirstin
name: Hinds, E. A.
name: Meijer, Gerard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Beams of polar molecules can be focused using an array of electrostatic lenses in alternating gradient (AG) configuration. They can also be accelerated or decelerated by applying an appropriate high voltage switching sequence to the lenses. AG focusing is applicable to molecules in both low-field and high-field-seeking states and is particularly well suited to the problem of decelerating heavy molecules and those in their ground rotational state. We describe the principles of AG deceleration and set out criteria to be followed in decelerator design, construction and operation. We calculate the longitudinal and transverse focusing properties of a decelerator, and exemplify this by 2D-imaging studies of a decelerated beam of metastable CO molecules.
description: fix author names
NMDS to Study Dead Wood Fungi Communities in Parks of New Jersey
Creators: name: Shumskaya, Maria
name: Zambell, Christopher
Publisher: name: QUBES Educational Resources
Year: 2019

description: Students use dead wood (saproxylic) fungi occurrence data from New Jersey, USA collected by students and faculty of Kean University to learn the basics of community ecology. Simple NMDS ordination and Jaccard index is performed using R. ...
Topological Goldstone phases of matter
Creators: name: Else, Dominic V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the possibility for phases of matter in which a continuous symmetry is spontaneously broken in a \emph{topologically non-trivial} way, which, roughly, means that the action for the Goldstone modes contains a quantized topological term, and could manifest in, for example, non-trivial quantum numbers of topological defects of the order parameter. We show that, in fact, such a scenario can occur only when the system is in a non-trivial symmetry-protected topological (SPT) or symmetry-enriched topological (SET) phase with respect to the residual symmetry; or alternatively, if the original symmetry before spontaneous symmetry breaking acts on the system in an "anomalous" way. Our arguments are based on a general correspondence between topological defects of the order parameter and topological defects of a background gauge field for the residual symmetry.
description: 4 pages + 1 page appendix. v3 Published version, with some additional physical explanations
MPEC 2024-T113 : 2023 HU7
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The Quantum McKay Correspondence for polyhedral singularities
Creators: name: Bryan, Jim
name: Gholampour, Amin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14N35

description: Let G be a polyhedral group, namely a finite subgroup of SO(3). Nakamura's G-Hilbert scheme provides a preferred Calabi-Yau resolution Y of the polyhedral singularity C^3/G. The classical McKay correspondence describes the classical geometry of Y in terms of the representation theory of G. In this paper we describe the quantum geometry of Y in terms of R, an ADE root system associated to G. Namely, we give an explicit formula for the Gromov-Witten partition function of Y as a product over the positive roots of R. In terms of counts of BPS states (Gopakumar-Vafa invariants), our result can be stated as a correspondence: each positive root of R corresponds to one half of a genus zero BPS state. As an application, we use the crepant resolution conjecture to provide a full prediction for the orbifold Gromov-Witten invariants of [C^3/G].
description: Introduction rewritten. Issue regarding non-uniqueness of conifold resolution clarified. Version to appear in Inventiones
title: Optimizing the number of locations per sub-region in multi-environment trials
Creators: name: Prus, Maryna
name: Piepho, Hans-Peter
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: optimal desing
subject: mixed models
subject: target population of environments
subject: multi-environment trials
subject: 610 Medical sciences; Medicine

description: New crop varieties are usually evaluated for their performance in a target population of environments (TPE). This evaluation requires conducting randomized field trials at several environments sampled from the TPE. Such trials are called multi-environment trials (MET). If the TPE is large and can[for full text, please go to the a.m. URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
Severe asceticism in early Daoist religion
Creators: name: Eskildsen, Stephen Edward
Publisher: name: University of British Columbia
Year: 2009

description: This dissertation is a survey and analysis of the ideal of severe asceticism conveyed in early religious Daoist texts. “Severe asceticism” in this study refers to religious practices that entail hardship, suffering and the rejection of basic human needs, along with the beliefs and attitudes that serve as justification and motivation for such practices. The period dealt with in the study is roughly the first six centuries of the common era. The study addresses three basic questions: 1) What specific severe ascetic training methods and ways of behavior were being carried out by Daoists? 2) What attitudes and beliefs served as motivation for such practices? 3) How and to what degree did the severe ascetic practices and the beliefs and attitudes dictating them evolve during the period in question? The study finds that throughout the period discussed, severe asceticism was always an important ideal for Daoists, especially for advanced adepts. The prominent severe ascetic practices included fasting, celibacy, sleep-avoidance, wilderness seclusion and selfimposed poverty. Highly uncommon and generally disapproved of were austeries which harmed and weakened the body with no purpose of ultimately strengthening it. In general, the motives for severe asceticism were (1) the strengthening and transformation of the body, (2) contact and participation in what is sacred and transcendent and (3) disdain and fear of the world and society. However, it is also discussed how during the latter part of the period examined, the emergence of new, partly Buddhist-influenced, soteriological and cosmological beliefs intensified the inherent tension between the two primary sotenological objectives, longevity and transcendence, and may have given justification to austenties which harmed the body and contradicted the archaic ideal of bodily immortality. In order to be able to analyze the phenomenon of severe asceticism in its full integrity, an approach has been taken that emphasizes comprehensiveness. This is because the phenomenon was much too widespread and diverse to be accurately assessed on the basis of one authoritative text. Thus a wide variety of sources have been utilized so that severe asceticism in early Daoist religion can be viewed to its fullest and understood properly based on a broad base of information.
Управление материальными активами в электросетевом секторе: обзор зарубежной литературы
Creators: name: Бегун Мария Андреевна
Publisher: name: Московский экономический журнал
Year: 2019
Subjects: управление активами
стратегии технического обслуживания материальных активов
надежностно-ориентированное техническое обслуживание активов; корректирующее техническое обслуживание; обслуживание по техническому состоянию; обслуживание по времени.

description: Организации заинтересованы в повышения эффективности и получения максимальной отдачи от своих инвестиций, в том числе от материальных активов. Надлежащее управление материальными активами имеет важное значение в организациях, где они обеспечивают основной вид деятельности. Спрос на эффективное управление материальными активами растет. За рубежом этой тенденции способствовала реструктуризация и дерегулирование рынка электроэнергии, превращая управление активами в один из ключевых элементов конкуренции, что обусловило активное развития теорий и практик данного направления менеджмента в научной среде. В электроэнергетической отрасли России подходы к управлению активами находятся в стадии формирования. Целью данного исследования было рассмотрение области применения управления материальными активами, изучение существующих стратегий технического обслуживания и вектора их дальнейшего развития в электроэнергетической отрасли. В статье выполнен обзор зарубежной научной литературы, представляющий актуальное видение управления материальными активами и дана их классификация. Обозначены ключевые процессы управления активами, выполнен анализ преимуществ и недостатков различных стратегий, определены современные тенденции дальнейшего развития стратегий управления активами с применением современных технологий.
Particle number fluctuations in nuclear collisions within excluded volume hadron gas model
Creators: name: Gorenstein, M. I.
name: Hauer, M.
name: Nikolajenko, D. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The multiplicity fluctuations are studied in the van der Waals excluded volume hadron-resonance gas model. The calculations are done in the grand canonical ensemble within the Boltzmann statistics approximation. The scaled variances for positive, negative and all charged hadrons are calculated along the chemical freeze-out line of nucleus-nucleus collisions at different collision energies. The multiplicity fluctuations are found to be suppressed in the van der Waals gas. The numerical calculations are presented for two values of hard-core hadron radius, $r=0.3$ fm and 0.5 fm, as well as for the upper limit of the excluded volume suppression effects.
description: 19 pages, 4 figures
Quantum circuits for exact unitary $t$-designs and applications to higher-order randomized benchmarking
Creators: name: Nakata, Yoshifumi
name: Zhao, Da
name: Okuda, Takayuki
name: Bannai, Eiichi
name: Suzuki, Yasunari
name: Tamiya, Shiro
name: Heya, Kentaro
name: Yan, Zhiguang
name: Zuo, Kun
name: Tamate, Shuhei
name: Tabuchi, Yutaka
name: Nakamura, Yasunobu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A unitary $t$-design is a powerful tool in quantum information science and fundamental physics. Despite its usefulness, only approximate implementations were known for general $t$. In this paper, we provide for the first time quantum circuits that generate exact unitary $t$-designs for any $t$ on an arbitrary number of qubits. Our construction is inductive and is of practical use in small systems. We then introduce a $t$-th order generalization of randomized benchmarking ($t$-RB) as an application of exact $2t$-designs. We particularly study the $2$-RB in detail and show that it reveals self-adjointness of quantum noise, a new metric related to the feasibility of quantum error correction (QEC). We numerically demonstrate that the $2$-RB in one- and two-qubit systems is feasible, and experimentally characterize background noise of a superconducting qubit by the $2$-RB. It is shown from the experiment that interactions with adjacent qubits induce the noise that may result in an obstacle toward the realization of QEC.
description: 26 pages + 4 pages of appendices, and 10 figures. v2: minor update. v3: published version
title: Conditional Information and Inference in Response-Adaptive Allocation Designs
Creators: name: Lane, Adam
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: adaptive design
subject: 610 Medical sciences; Medicine

description: Response-adaptive allocation designs refer to a class of designs where the probability an observation is assigned to a treatment is changed throughout an experiment based on the accrued responses. Such procedures result in random treatment sample sizes. Most of the current literature considers unconditional[for full text, please go to the a.m. URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
title: Maximum Likelihood estimation under two-stage adaptive designs with finite first-stage samples
Creators: name: May, Caterina
name: Flournoy, Nancy
name: Tommasi, Chiara
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: maximum likelihood
subject: non-linear regression
subject: small samples
subject: asymptotics
subject: stable convergence
subject: two-stage experimental design
subject: 610 Medical sciences; Medicine

description: In this work, we study the properties of the maximum likelihood estimator (MLE) for the vector parameter of a non-linear model with Gaussian errors. To estimate the multidimensional parameter as precisely as possible, the experimental conditions are chosen according to a two-stage design. The observations[for full text, please go to the a.m. URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
Effects of turbulence in the Circumnuclear Disk
Creators: name: Dinh, Cuc K.
name: Salas, Jesus M.
name: Morris, Mark R.
name: Naoz, Smadar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A Circumnuclear Disk (CND) of molecular gas occupies the central few parsecs of the Galactic Center. It is likely subject to turbulent disruptions from violent events in its surrounding environment, but the effect of such perturbations has not yet been investigated in detail. Here we perform 3D, N-body/smoothed particle hydrodynamic (SPH) simulations with an adapted general turbulence driving method to investigate the CND's structural evolution, in particular its reaction to varied scales of injected turbulence. We find that, because of shear flow in the disk, transient arcs of gas (streams) naturally arise when turbulence is driven on large scales (up to ~4 pc), as might occur when a supernova blast wave encounters the CND. Because energetic events arise naturally and often in the central parsecs of our Galaxy, this result suggests that the transient structures that characterize the CND do not imply that the CND itself is a transient structure. We also note that features similar to the density concentrations, or "clumps", detailed in literature emerge when we account for the observed orientation of the disk and for the spatial resolution of observations. As such, clumps could be an artifact of observational limitations.
description: 19 pages, 9 figures. Accepted for publication by ApJ
title: Optimal subsample selection in big datasets
Creators: name: Tommasi, Chiara
name: Deldossi, Laura
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: model-based survey sampling
subject: optimal design theory
subject: design efficiency
subject: 610 Medical sciences; Medicine

description: Big Data are a huge quantity of data that usually are automatically accrued. To achive inferential goals might be computationally difficult due to their large dimension; from here, the idea of selecting a subsample of the Big Dataset. To accomplish this goal, the Big Dataset is conceived of as[for full text, please go to the a.m. URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
title: Tall data subsampling and outlier detection via optimal experimental design
Creators: name: Harman, Radoslav
name: Rosa, Samuel
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: D-optimal design
subject: big data
subject: subsampling
subject: outliers
subject: minimum-volume enclosing ellipsoid
subject: 610 Medical sciences; Medicine

description: A dataset is called “tall” if it contains a very large number of observations (corresponding to, say, a million of rows of the data matrix), but each observation has only a moderate dimension (the data matrix has at most a few tens of columns). In the talk, we will propose a method that[for full text, please go to the a.m. URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
Υπό συνθήκες οικονομικής κρίσης υπάρχει μέλλον για τις Ελληνικές Μικρομεσαίες επιχειρήσεις; Ποιες οι απαιτούμενες στρατηγικές;:
Creators: name: Κοντογιάννης, Νικόλαος Στέφανου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Μικρομεσαίες επιχειρήσεις
Οικονομική κρίση
Στρατηγικές
Small-medium enterprises
Economic crisis
Strategies

description: H παρούσα εργασία διερευνά αφενός τα σοβαρά προβλήματα που αντιμετωπίζουν οι ελληνικές Μικρό-Μεσαίες Επιχειρήσεις (ΜΜΕ) λόγω της οικονομικής κρίσης της χώρας αφετέρου τη δυνατότητά τους να τα ξεπεράσουν και να εξασφαλίσουν την επιβίωσή τους, εφαρμόζοντας τις κατάλληλες στρατηγικές. Η ακολουθούμενη μεθοδολογία, βασιζόμενη σε εμπεριστατωμένη δευτερογενή έρευνα, προσεγγίζει τη διερεύνηση των εναλλακτικών στρατηγικών που είναι κατάλληλες να εφαρμοστούν από τις ΜΜΕ με βάση τόσο τα κύρια χαρακτηριστικά, τα πλεονεκτήματα και μειονεκτήματά τους όσο και τα συγκεκριμένα προβλήματα που αντιμετωπίζουν λόγω της οικονομικής κρίσης σε συνδυασμό με: τις προϋπάρχουσες αδυναμίες των ελληνικών ΜΜΕ και τις παθογένειες της δημόσιας διοίκησης, τις παρουσιαζόμενες ευκαιρίες και τα μέσα που έχουν στη διάθεσή τους, καθώς και τις βασικές αλλαγές οι οποίες απαιτούνται προκειμένου να βελτιώσουν την ανταγωνιστικότητά τους και να εξασφαλίσουν την επιβίωσή τους. Ως γενικό συμπέρασμα της εργασίας προέκυψε ότι, με τις απαιτούμενες ριζικές αλλαγές και εφαρμόζοντας άμεσα και δραστικά τις κατάλληλες στρατηγικές, παρά τις εξαιρετικά αντίξοες συνθήκες, οι ελληνικές ΜΜΕ έχουν τη δυνατότητα να επιβιώσουν από την οικονομική κρίση, όπως και να πετύχουν περεταίρω ανάπτυξη.
description: The purpose of the present thesis is to examine both the serious problems that the greek Small-Medium Enterprises (SMEs) are facing due to the current economic crisis of the country and the appropriate strategies that they must apply in order to overcome the crisis and ensure their survival. The methodology of this thesis, based on thorough secondary research, approaches the investigation of the appropriate alternative strategies that can be applied by SMEs, by taking into account the main characteristics, the advantages and disadvantages of the SMEs and the specific problems they are facing because of the economic crisis in conjunction with the already existent weaknesses of the greek SMEs and the incompetence of the public administration, the opportunities that arise and the supporting means available to them, as well as the necessary changes that are required so as to improve their competitiveness and ensure their survival. Our research led to the general conclusion that the greek SMEs, despite the extreme difficult circumstances, are able to survive the economic crisis and achieve further development if they make the necessary radical changes and immediately implement the appropriate strategies.
Optimum Quantum Error Recovery using Semidefinite Programming
Creators: name: Fletcher, Andrew S.
name: Shor, Peter W.
name: Win, Moe Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum error correction (QEC) is an essential element of physical quantum information processing systems. Most QEC efforts focus on extending classical error correction schemes to the quantum regime. The input to a noisy system is embedded in a coded subspace, and error recovery is performed via an operation designed to perfectly correct for a set of errors, presumably a large subset of the physical noise process. In this paper, we examine the choice of recovery operation. Rather than seeking perfect correction on a subset of errors, we seek a recovery operation to maximize the entanglement fidelity for a given input state and noise model. In this way, the recovery operation is optimum for the given encoding and noise process. This optimization is shown to be calculable via a semidefinite program (SDP), a well-established form of convex optimization with efficient algorithms for its solution. The error recovery operation may also be interpreted as a combining operation following a quantum spreading channel, thus providing a quantum analogy to the classical diversity combining operation.
description: 7 pages, 3 figures
Set theoretic Yang-Baxter equation, braces and Drinfeld twists
Creators: name: Doikou, Anastasia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider involutive, non-degenerate, finite set theoretic solutions of the Yang-Baxter equation. Such solutions can be always obtained using certain algebraic structures that generalize nil potent rings called braces. Our main aim here is to express such solutions in terms of admissible Drinfeld twists substantially extending recent preliminary results. We first identify the generic form of the twists associated to set theoretic solutions and we show that these twists are admissible, i.e. they satisfy a certain co-cycle condition. These findings are also valid for Baxterized solutions of the Yang-Baxter equation constructed from the set theoretical ones.
description: 23 pages, LaTex. A few comments added
Development of thermally stable coarse water-in-oil emulsions as potential DNA bioreactors
Creators: name: Romero-Peña, Maria
name: Ng, Enders Kaion
name: Ghosh, Supratim
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Inorganic Chemistry

description: Conventional polymerase chain reaction (PCR) performed in a continuous aqueous phase often shows an inability to detect ultra-low DNA concentration. Droplet digital PCR, where DNA polymerization happens in isolated water droplets of water-in-oil (W/O) emulsions, could significantly improve the detection limit. However, water droplet breakups under multiple thermal cycles necessary for DNA polymerization is preventing the wide-spread application of such technology. The present research aims to develop thermally stable coarse W/O emulsions that could act as DNA microreactors. Span 80, polyglycerol polyricinoleate (PGPR), or sodium bis(2-ethylhexyl) sulfosuccinate (AOT) were dissolved in mixtures of light and heavy mineral oils at different concentrations. The aqueous phase was selected based on PCR protocol, without the presence of enzymes and DNA. Emulsions prepared without bovine serum albumin (BSA) in the aqueous phase was used as a control to understand its effect on stability. Emulsions were formed using a vortex mixer for 2 minutes at 3200 rpm. Only the emulsions without visible aqueous phase separation were exposed to PCR thermal cycling. The volume mean diameters of water droplets were calculated by image analysis. Span 80-stabilized emulsions destabilized upon thermal cycling, while PGPR-stabilized emulsions remained stable with an increase in water droplet size. AOT was able to form thermally stable emulsions, with an average droplet size around 119 µm without any significant change. The influence of emulsifiers concentration, surface saturation, molecular interaction with BSA at the interface, and continuous oil phase viscosity was considered to explain the mechanism of emulsion formation and thermal stability.
MPEC 2024-T114 : 2024 TD2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TD2

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Black Holes in Einstein-Aether Theory
Creators: name: Eling, Christopher
name: Jacobson, Ted
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study black hole solutions in general relativity coupled to a unit timelike vector field dubbed the "aether". To be causally isolated a black hole interior must trap matter fields as well as all aether and metric modes. The theory possesses spin-0, spin-1, and spin-2 modes whose speeds depend on four coupling coefficients. We find that the full three-parameter family of local spherically symmetric static solutions is always regular at a metric horizon, but only a two-parameter subset is regular at a spin-0 horizon. Asymptotic flatness imposes another condition, leaving a one-parameter family of regular black holes. These solutions are compared to the Schwarzschild solution using numerical integration for a special class of coupling coefficients. They are very close to Schwarzschild outside the horizon for a wide range of couplings, and have a spacelike singularity inside, but differ inside quantitatively. Some quantities constructed from the metric and aether oscillate in the interior as the singularity is approached. The aether is at rest at spatial infinity and flows into the black hole, but differs significantly from the the 4-velocity of freely-falling geodesics.
description: 22 pages, 6 figures; v2: minor editing; v3: corrected overall sign in twist formula and an error in the equation for the aether stress tensor. Results unchanged since correct form was used in calculations; v4: corrected minor typo
title: Digitalisierung und ihre Wirkung auf die Wertschöpfungskette von Krankenversicherungen
Creators: name: Peters, Björn
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Die Digitalisierung und Big Data im Speziellen wirken auf unterschiedliche Weise horizontal entlang der Wertschöpfungskette einer Krankenversicherung und ebenso vertikal in den einzelnen Teilbereichen sowie in Bezug auf die Interaktionen der Krankenversicherung mit Kunden und Leistungserbringern.[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 65th Annual Meeting of the German Association for Medical Informatics, Biometry and Epidemiology (GMDS), Meeting of the Central European Network (CEN: German Region, Austro-Swiss Region and Polish Region) of the International Biometric Society (IBS)
Additional file 4 of Early non-response as a predictor of later non-response to antipsychotics in schizophrenia: a randomized trial
Creators: name: Long, Yujun
name: Wu, Qiongqiong
name: Yang, Ye
name: Cai, Jingda
name: Xiao, Jingmei
name: Liu, Zhaoqian
name: Xu, Yifeng
name: Chen, Ying
name: Huang, Manli
name: Zhang, Ruiguo
name: Xu, Xijia
name: Hu, Jian
name: Liu, Zhifen
name: Liu, Fang
name: Zheng, Yingjun
name: Meng, Huaqing
name: Wang, Zhimin
name: Tang, Yanqing
name: Song, Xueqin
name: Chen, Yunchun
name: Wang, Xueyi
name: Liu, Tiebang
name: Wu, Xiaoli
name: Fang, Maosheng
name: Wan, Chunling
name: Zhao, Jingping
name: Wu, Renrong
Publisher: name: figshare
Year: 2023
Subjects: subject: Pharmacology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health
subject: Plant Biology
subject: FOS: Biological sciences

description: Additional file 4: Table S3. Lack of 2 weeks improvement cut-offs as predictors of nonresponse in four antipsychotics.
The Strange Parton Distribution of the Nucleon: Global Analysis and Applications
Creators: name: Lai, H. L.
name: Nadolsky, P.
name: Pumplin, J.
name: Stump, D.
name: Tung, W. K.
name: Yuan, C. -P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The strangeness degrees of freedom in the parton structure of the nucleon are explored in the global analysis framework, using the new CTEQ6.5 implementation of the general mass perturbative QCD formalism of Collins. We systematically determine the constraining power of available hard scattering experimental data on the magnitude and shape of the strange quark and anti-quark parton distributions. We find that current data favor a distinct shape of the strange sea compared to the isoscalar non-strange sea. A new reference parton distribution set, CTEQ6.5S0, and representative sets spanning the allowed ranges of magnitude and shape of the strange distributions, are presented. Some applications to physical processes of current interest in hadron collider phenomenology are discussed.
description: 19 pages; revised version submitted to JHEP
Evolving water policy in the Bangkok metropolitan region
Creators: name: Kraisoraphong, Keokam
Publisher: name: University of British Columbia
Year: 2009

description: The study focuses on the problems of water allocation in Thailand where the alternative of introducing a comprehensive water-pricing system has become a controversial issue. Governed by the regime of open access, the Thai water allocation system has failed to cope with newly surfacing demands and necessities. The system has yet to overcome old perceptions and habits. The case studied is the Bangkok Metropolitan Region (BMR), the area of greatest social-economic changes and most acute water allocation conflicts in Thailand. Proposals to shift water allocation decisions from the government to the market by way of water-pricing have not been well received by the government as a result of political uncertainty. While the government is in favour of increased centralization to improve its administrative control, the academic circles are calling for institutional reforms which would include specifications of property rights to water. As a contribution to the area of Thai water management, this study examines water resource issues in relation to the water demand profile of the BMR, the issue of property rights and water allocation, the historical development within Thai political economy, the trends that shape possible changes within the policy arena and how these changes can positively affect water allocation systems in Thailand in terms of pricing. The study is based on reviews of relevant theory, interviews and analysis of both published and unpublished data on the BMR. Water issues in the BMR revolve around problems of water shortage, groundwater over-extraction, and deteriorating water quality. The demand profile indicates that the existing water allocation system is not able to sufficiently accommodate the BMR's water demand, neither in quantity nor in spatial distribution. The state's centralized administrative control has failed to provide an efficient and equitable system for water allocation. Solutions currently being proposed follow one of three alternatives: increase state centralization to correct administrative errors, conserve and revive traditional systems, or introduce market-based tools such as a water-pricing. The study suggests that there needs to be a shift in government policy to develop a mechanism whereby water allocation and management recognize the significance of local community inputs as represented by interest groups.
Investigation of the oxohalogenide Cu4Te5O12Cl4 with weakly coupled Cu(II) tetrahedra
Creators: name: Takagi, Rie
name: Johnsson, Mats
name: Gnezdilov, Vladimir
name: Kremer, Reinhard K.
name: Brenig, Wolfram
name: Lemmens, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The crystal structure of the copper(II) tellurium(IV) oxochloride Cu$_{4}$Te$_{5}$O$_{12}$Cl$_{4}$ (Cu-45124) is composed of weakly coupled tetrahedral Cu clusters and shows crystallographic similarities with the intensively investigated compound Cu$_{2}$Te$_{2}$O$_{5}$X$_{2}$, with X~=~Cl, Br (Cu-2252). It differs from the latter by a larger separation of the tetrahedra within the crystallographic ab plane, that allows a more direct assignment of important inter-tetrahedra exchange paths and the existence of an inversion center. Magnetic susceptibility and specific heat evidence antiferromagnetic, frustrated correlations of the Cu spin moments and long range ordering with $T_{c}$=13.6 K. The entropy related to the transition is reduced due to quantum fluctuations. In Raman scattering a well structured low energy magnetic excitation is observed at energies of $\approx$50K (35cm$^{-1})$. This energy scale is reduced as compared to Cu-2252.
description: 11 pages, 9 figures, further information see http://www.peter-lemmens.de