cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geometry of iteration stable tessellations: Connection with Poisson hyperplanes
Creators: name: Schreiber, Tomasz
name: Thaele, Christoph
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Since the seminal work by Nagel and Weiss, the iteration stable (STIT) tessellations have attracted considerable interest in stochastic geometry as a natural and flexible, yet analytically tractable model for hierarchical spatial cell-splitting and crack-formation processes. We provide in this paper a fundamental link between typical characteristics of STIT tessellations and those of suitable mixtures of Poisson hyperplane tessellations using martingale techniques and general theory of piecewise deterministic Markov processes (PDMPs). As applications, new mean values and new distributional results for the STIT model are obtained.
description: Published in at http://dx.doi.org/10.3150/12-BEJ424 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm). arXiv admin note: text overlap with arXiv:1001.0990
Hawking Radiation from Fluctuating Black Holes
Creators: name: Takahashi, Tomohiro
name: Soda, Jiro
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Classically, black Holes have the rigid event horizon. However, quantum mechanically, the event horizon of black holes becomes fuzzy due to quantum fluctuations. We study Hawking radiation of a real scalar field from a fluctuating black hole. To quantize metric perturbations, we derive the quadratic action for those in the black hole background. Then, we calculate the cubic interaction terms in the action for the scalar field. Using these results, we obtain the spectrum of Hawking radiation in the presence of interaction between the scalar field and the metric. It turns out that the spectrum deviates from the Planck spectrum due to quantum fluctuations of the metric.
description: 35pages, 4 figures
A novel computer simulation method for simulating the multiscale transduction dynamics of signal proteins
Creators: name: Peter, Emanuel
name: Dick, Bernhard
name: Baeurle, Stephan A.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: cancer, cell motility, enzymes, hydrogen bonds, microorganisms, molecular biophysics, molecular dynamics method, Monte Carlo methods
subject: 540 Chemie
subject: 87.15.ap
subject: 87.14.ej
subject: 87.19.xj
subject: 87.15.R-
subject: 87.15.Fh
subject: 87.15.ak

description: Signal proteins are able to adapt their response to a change in the environment, governing in this way a broad variety of important cellular processes in living systems. While conventional molecular-dynamics (MD) techniques can be used to explore the early signaling pathway of these protein systems at atomistic resolution, the high computational costs limit their usefulness for the elucidation of the multiscale transduction dynamics of most signaling processes, occurring on experimental timescales. To cope with the problem, we present in this paper a novel multiscale-modeling method, based on a combination of the kinetic Monte-Carlo- and MD-technique, and demonstrate its suitability for investigating the signaling behavior of the photoswitch light-oxygen-voltage-2-Jα domain from Avena Sativa (AsLOV2-Jα) and an AsLOV2-Jα-regulated photoactivable Rac1-GTPase (PA-Rac1), recently employed to control the motility of cancer cells through light stimulus. More specifically, we show that their signaling pathways begin with a residual re-arrangement and subsequent H-bond formation of amino acids near to the flavin-mononucleotide chromophore, causing a coupling between β-strands and subsequent detachment of a peripheral α-helix from the AsLOV2-domain. In the case of the PA-Rac1 system we find that this latter process induces the release of the AsLOV2-inhibitor from the switchII-activation site of the GTPase, enabling signal activation through effector-protein binding. These applications demonstrate that our approach reliably reproduces the signaling pathways of complex signal proteins, ranging from nanoseconds up to seconds at affordable computational costs. © 2012 American Institute of Physics
A spatially homogeneous and isotropic Einstein–Dirac cosmology
Creators: name: Finster, Felix
name: Hainzl, Christian
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: cosmology, Einstein field equations, gravitation, oscillations, tensors, wave functions
subject: 510 Mathematik
subject: 98.80.-k
subject: 04.20.-q
subject: 95.30.Sf

description: We consider a spatially homogeneous and isotropic cosmological model where Dirac spinors are coupled to classical gravity. For the Dirac spinors we choose a Hartree–Fock ansatz where all one-particle wave functions are coherent and have the same momentum. If the scale function is large, the universe behaves like the classical Friedmann dust solution. If however the scale function is small, quantum effects lead to oscillations of the energy-momentum tensor. It is shown numerically and proven analytically that these quantum oscillations can prevent the formation of a big bang or big crunch singularity. The energy conditions are analyzed. We prove the existence of time-periodic solutions which go through an infinite number of expansion and contraction cycles.
Blocking Observed in Human Instrumental Conditioning
Creators: name: Hammerl, Marianne
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 150 Psychologie

description: In animal research, blocking of instrumental responding is a well-known phenomenon, whereas no study has been reported that investigated blocking in human instrumental conditioning. Following the standard method used in nonhuman subjects, 48 students randomly assigned to one of three groups were exposed to a variable interval schedule (VI 10 s) in which reinforcement was delivered with a brief delay (500 ms). In the blocking condition, subjects experienced a tone stimulus during the delay (correlated group). In the two control conditions, subjects received either no tone (no-tone group) or the same number of tones as subjects of the correlated group, but the tones were independent of their behavior and reward (random group). As expected, instrumental responding was significantly lower in the correlated group than in either the no-tone or the random group. In a subsequent extinction phase, no difference in resistance was observed. A postexperimental interview revealed that subjects of the correlated group were more likely to detect the temporal nature of the reinforcement schedule than subjects of the other groups, but there was no relation to response rate. The data provide only little support for a notion of signal-induced enhanced learning, but do not challenge an interpretation in terms of associative competition between the response and the signal.
Topology, the Wilson flow and the HMC algorithm
Creators: name: Lüscher, Martin
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: An old and apparently persistent problem in numerical lattice QCD is that the simulations tend to get trapped in a sector of fixed topological charge when the lattice spacing is taken to zero. The effect sets in very rapidly and may invalidate the simulation results in certain cases. In this talk, the issue is discussed using the Wilson flow as a tool. The flow has a simple scaling behaviour and allows one to understand how exactly the topological sectors emerge in the continuum limit. Further studies however suggest that the observed slowdown of the simulations at small lattice spacings is only partly caused by the emergence of the sectors.
description: LaTeX source, 13 pages, 6 figures. Talk given at the XXVIII International Symposium on Lattice Field Theory, June 14-19 2010, Villasimius, Italy. Corrected figures 4 and 5, following the discovery of a bug in the analysis programs (thanks to Yoshifumi Nakamura)
Limit theorems for iteration stable tessellations
Creators: name: Schreiber, Tomasz
name: Thaele, Christoph
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: The intent of this paper is to describe the large scale asymptotic geometry of iteration stable (STIT) tessellations in $\mathbb{R}^d$, which form a rather new, rich and flexible class of random tessellations considered in stochastic geometry. For this purpose, martingale tools are combined with second-order formulas proved earlier to establish limit theorems for STIT tessellations. More precisely, a Gaussian functional central limit theorem for the surface increment process induced a by STIT tessellation relative to an initial time moment is shown. As second main result, a central limit theorem for the total edge length/facet surface is obtained, with a normal limit distribution in the planar case and, most interestingly, with a nonnormal limit showing up in all higher space dimensions.
description: Published in at http://dx.doi.org/10.1214/11-AOP718 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org). arXiv admin note: text overlap with arXiv:1001.0990
Spontaneous Formation of Dynamical Groups in an Adaptive Networked System
Creators: name: Li, Menghui
name: Guan, Shuguang
name: Lai, C. -H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Social and Information Networks (cs.SI)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this work, we investigate a model of an adaptive networked dynamical system, where the coupling strengths among phase oscillators coevolve with the phase states. It is shown that in this model the oscillators can spontaneously differentiate into two dynamical groups after a long time evolution. Within each group, the oscillators have similar phases, while oscillators in different groups have approximately opposite phases. The network gradually converts from the initial random structure with a uniform distribution of connection strengths into a modular structure which is characterized by strong intra connections and weak inter connections. Furthermore, the connection strengths follow a power law distribution, which is a natural consequence of the coevolution of the network and the dynamics. Interestingly, it is found that if the inter connections are weaker than a certain threshold, the two dynamical groups will almost decouple and evolve independently. These results are helpful in further understanding the empirical observations in many social and biological networks.
description: 14 page, 5 figures
MUSIC THERAPY: IBN SINA'S APPROACH OF USING MUSIC AS MEDICINE
Creators: name: Toshboyeva, M.
Publisher: name: Zenodo
Year: 2024

description: Music therapy has gained renewed interest in modern medical practices, but its roots can be traced back centuries to early scholars like Ibn Sina (Avicenna), who recognized music’s therapeutic potential. This article delves into the pioneering ideas of Ibn Sina, especially from his work The Book of Healing, and examines how he perceived music as a form of medicine. The paper also explores the scientific connection between musical rhythms and human physiology, particularly the heart rate, while linking these ancient practices to modern applications of music therapy in Uzbekistan. Finally, it suggests methods to enhance the role of music therapy in contemporary healthcare systems.
Properties of the integrated spectrum of serendipitous 2XMM catalogue sources
Creators: name: Chaudhary, P.
name: Brusa, M.
name: Hasinger, G.
name: Merloni, A.
name: Comastri, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Our analysis is aimed at characterizing the properties of the integrated spectrum of active galactic nuclei (AGNs) such as the ubiquity of the Fe Kα emission in AGNs and the dependence of the spectral parameters on the X-ray luminosity and redshift. We selected 2646 point sources from the 2XMM catalogue at high galactic latitude (|BII| > 25 degrees) and with the sum of EPIC-PN and EPIC-MOS 0.2-12 keV counts greater than 1000. Redshifts were obtained for 916 sources from the NED. The final sample consists of 507 AGN. Individual source spectra have been summed in the observed frame to compute the integrated spectra in different redshift and luminosity bins over the range 0
description: 10 pages, 7 figures, 2 Tables. A&A in press
Three essays in corporate finance
Creators: name: Liao, Shushu
Publisher: name: Lancaster University
Year: 2019

description: This dissertation is comprised of three stand-alone essays in the field of
      corporate finance. Chapter 1 provides an introduction and overview of the
      three essays (Chapter 2-4). Chapter 2 explores the driving force behind
      the observed declining pattern of investment-cash flow sensitivity, which
      has puzzled empirical researchers for a decade. It investigates the
      variation of capital adjustment costs in explaining the investment-cash
      flow sensitivity and shows that the decreasing trend of the
      investment-cash flow sensitivity can be explained by the gradually
      increasing costs of capital adjustment. Chapter 3 studies the behavior of
      the firms in the aftermath of the 2007-09 financial crisis. A negative
      shock to the collateral value, which results in tightening the borrowing
      capacity, leads to a protracted recession of the firms’ activities with
      the real business conditions unaffected. However, the effect of the
      collateral shock subsides when it coincides with a slowdown in the
      productivity. The reduction of labor adjustment costs causes investment
      and employment growth to decline more (less) aggressively with the
      negative productivity shock (collateral shock) and the trimming of labor
      adjustment costs fares better for the small firms. A flexible wage
      contract can significantly alleviate the negative impact of the collateral
      shock. While the equity issuance falls (rises) with the adverse
      productivity (collateral) shock, the cyclical behavior of equity financing
      is less pronounced for the more financially constrained firms. Chapter 4
      is motivated by the endogeneity problem in standard regression
      methodologies, which may overlook the coefficient biases induced by the

      measurement error in the variables. The measurement error in Tobin’s q,
      which operates via the covariance between q and cash flow, plays an
      important part in explaining the time-series and cross-sectional pattern
      of investment-cash flow sensitivity. Moreover, even a high-order
      moment-based GMM estimator cannot address the bias if the measurement
      error is not independent of q (a non-classical error). Chapter 5
      summarizes the main findings and concludes the thesis.
Completely integrable Hamiltonian systems with weak Lyapunov instability or isochrony
Creators: name: Zampieri, Gaetano
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37J35, 37J25

description: The aim of this paper is to introduce a class of Hamiltonian autonomous systems in dimension 4 which are completely integrable and their dynamics is described in all details. They have an equilibrium point which is stable for some rare elements of the class, and unstable in most cases. Anyhow, it is linearly stable (all orbits of the linearized system are bounded) and no motion is asymptotic in the past, namely no non-constant solution has the equilibrium as limit point as time goes to minus infinity. In the unstable cases, there is a sequence of initial data which converges to the equilibrium point whose corresponding solutions are unbounded and the motion is slow. So instability is quite weak and perhaps no such explicit examples of instability are known in the literature. The stable cases are also interesting since the level sets of the 2 first integrals independent and in involution keep being non-compact and stability is related to the isochronous periodicity of all orbits near the equilibrium point and the existence of a further first integral. Hopefully, these superintegrable Hamiltonian systems will deserve further research.
The Theory of the Interleaving Distance on Multidimensional Persistence Modules
Creators: name: Lesnick, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Geometry (cs.CG)
subject: Algebraic Topology (math.AT)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In 2009, Chazal et al. introduced $ε$-interleavings of persistence modules. $ε$-interleavings induce a pseudometric $d_I$ on (isomorphism classes of) persistence modules, the interleaving distance. The definitions of $ε$-interleavings and $d_I$ generalize readily to multidimensional persistence modules. In this paper, we develop the theory of multidimensional interleavings, with a view towards applications to topological data analysis. We present four main results. First, we show that on 1-D persistence modules, $d_I$ is equal to the bottleneck distance $d_B$. This result, which first appeared in an earlier preprint of this paper, has since appeared in several other places, and is now known as the isometry theorem. Second, we present a characterization of the $ε$-interleaving relation on multidimensional persistence modules. This expresses transparently the sense in which two $ε$-interleaved modules are algebraically similar. Third, using this characterization, we show that when we define our persistence modules over a prime field, $d_I$ satisfies a universality property. This universality result is the central result of the paper. It says that $d_I$ satisfies a stability property generalizing one which $d_B$ is known to satisfy, and that in addition, if $d$ is any other pseudometric on multidimensional persistence modules satisfying the same stability property, then $d\leq d_I$. We also show that a variant of this universality result holds for $d_B$, over arbitrary fields. Finally, we show that $d_I$ restricts to a metric on isomorphism classes of finitely presented multidimensional persistence modules.
description: Major revision; exposition improved throughout. To appear in Foundations of Computational Mathematics. 36 pages
Dimensions of educational stratification : non-standard employment, workplace task discretion, and educational beliefs
Creators: name: Pullman, Ashley Michelle
Publisher: name: University of British Columbia
Year: 2017

description: My dissertation consists of three distinct yet interrelated studies. Its purpose is to extend research and theory on inequality by investigating three educational outcomes: non-standard employment, workplace task discretion, and intrinsic and extrinsic educational beliefs. As a body of work, my research generates insight into how the level and type of educational attainment affect divergent life course pathways. The first study examines gender inequality in early career part-time and temporary employment in Canada. Through two types of decomposition analyses, I research non-standard employment across four cohorts graduating between 1990 and 2010, studying the extent to which gender stratification within fields of study or systemic employment inequality contribute to dissimilar outcomes. I find that rates of non-standard employment vary substantially across disciplines. Furthermore, the over and under-representation of women in certain fields is a main factor explaining gender differences in temporary employment but cannot fully account for disparities in part-time employment. The second study researches the relationship between education and workplace task discretion in 30 countries. Through regression and decomposition analyses, I examine the direct association between education and task discretion and the extent to which skill and occupational sector function as mediators. I compare individual-agency and critical-institutional theoretical perspectives as explanations for direct and indirect associations. My findings mainly support critical-institutional accounts and yield evidence of a relative relationship between education and task discretion. That is, in contexts where task discretion is higher overall and more equal among occupations, education, skill, and occupational sector are less significant mechanisms of stratification. The third study considers how intrinsic and extrinsic educational beliefs change over adulthood. My research is based on a longitudinal study that repeatedly surveyed the same graduating British Columbia high school cohort over 28 years. Through hierarchical growth modelling, I contrast demographic and experience-based explanations to consider the influence of social origin and individual education and employment participation over time. The findings suggest that both life course experiences and social position have an influence on initial educational beliefs in early adulthood and the rate of change over time. Additionally, educational beliefs are more variable in early adulthood and become more stable later in participants’ life courses.
GUMANITAR FANLAR TARAQQIYOTIDA IKKI TILLILIK HODISASINING ROLI
Creators: name: Babajonov, Xusan
Publisher: name: Zenodo
Year: 2024

description: So'nggi o'n yillikda kognitiv va lingvistik rivojlanishga ikki tilli ta'sirni o'rganuvchi tadqiqotlar sezilarli darajada oshdi. Ikki tillilik - bu aqliy va til yutuqlarining keng doirasini qamrab oladigan doimiy o'sish sohasi. 20-asrning aksariyat qismida ikki tillilik normal til rivojlanishiga tahdid soladi va kognitiv yutuqlarga putur etkazadi deb taxmin qilingan.
Stellar activity and magnetic shielding
Creators: name: Grießmeier, J. -M.
name: Khodachenko, M.
name: Lammer, H.
name: Grenfell, J. L.
name: Stadelmann, A.
name: Motschmann, U.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Stellar activity has a particularly strong influence on planets at small orbital distances, such as close-in exoplanets. For such planets, we present two extreme cases of stellar variability, namely stellar coronal mass ejections and stellar wind, which both result in the planetary environment being variable on a timescale of billions of years. For both cases, direct interaction of the streaming plasma with the planetary atmosphere would entail servere consequences. In certain cases, however, the planetary atmosphere can be effectively shielded by a strong planetary magnetic field. The efficiency of this shielding is determined by the planetary magnetic dipole moment, which is difficult to constrain by either models or observations. We present different factors which influence the strength of the planetary magnetic dipole moment. Implications are discussed, including nonthermal atmospheric loss, atmospheric biomarkers, and planetary habitability.
description: 6 figures; printed in Proceedings of the International Astronomical Union (2009), Cambridge University Press
Intensity distribution of non-linear scattering states
Creators: name: Hartmann, Timo
name: Urbina, Juan-Diego
name: Richter, Klaus
name: Schlagheck, Peter
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: transport, Gross-Pitaevskii equation, weak localization, matter waves, intensity distribution
subject: 530 Physik
subject: 05.45.Mt
subject: 05.60.Gg
subject: 03.75.-b
subject: 67.85.-d
subject: 03.75.Kk

description: We investigate the interplay between coherent effects characteristic of the propagation of linear waves, the non-linear effects due to interactions, and the quantum manifestations of classical chaos due to geometrical confinement, as they arise in the context of the transport of Bose-Einstein condensates. We specifically show that, extending standard methods for non-interacting systems, the body of the statistical distribution of intensities for scattering states solving the Gross-Pitaevskii equation is very well described by a local Gaussian ansatz with a position-dependent variance. We propose a semiclassical approach based on interfering classical paths to fix the single parameter describing the universal deviations from a global Gaussian distribution. Being tail effects, rare events like rogue waves characteristic of non-linear field equations do not affect our results.
Baryon wave functions from lattice QCD
Creators: name: Braun, Vladimir M.
name: Göckeler, Meinulf
name: Horsley, Roger
name: Nakamura, Yoshifumi
name: Pleiter, Dirk
name: Rakow, Paul E. L
name: Schäfer, Andreas
name: Schiel, R.
name: Schierholz, Gerrit
name: Stüben, Hirnnerk
name: Wein, P.
name: Zanotti, James M.
name: QCDSF, Colaboration
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik

description: We describe an ongoing project by the QCDSF collaboration to calculate baryon wave functions at small inter-quark separation using lattice QCD. Preliminary results are presented for the wave functions at the origin and momentum fractions carried by the valence quarks in the nucleon and its negative parity partner, N* (1535). The calculations are done using two flavors of dynamical (clover) fermions on lattices of different volume and pion masses down to mπ ≃ 180 MeV.
Time auto-correlation function and Green-Kubo formula: A study on disordered harmonic chain
Creators: name: Kundu, Anupam
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have considered heat conduction in a one-dimensional mass disordered harmonic chain of $N$ particles connected to two Langevin type reservoirs at different temperatures. An exact expression for the boundary heat current-current auto-correlation function in the non-equilibrium steady state (NESS) is obtained in terms of non-equilibrium phonon Green's functions. The time integral of the correlation function gives expected result, both in non-equilibrium as well as equilibrium cases. Using the form of this correlation function we show that asymptotic system size dependence of current fluctuation in NESS for a mass disordered harmonic chain is $N^{-α}$ for different boundary conditions. For free and fixed boundary conditions we get $α=1/2$ and 3/2 respectively, while for pinned case the fluctuation decays exponentially with system size.
Dependence of the Dresselhaus spin-orbit interaction on the quantum well width
Creators: name: Walser, M. P.
name: Siegenthaler, U.
name: Lechner, V.
name: Schuh, Dieter
name: Ganichev, Sergey
name: Wegscheider, Werner
name: Salis, G.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik
subject: 71.70.Ej, 73.21.Fg, 72.25.Rb, 85.75.-d

description: We measured the Dresselhaus spin-orbit interaction coefficient β₁ for (001)-grown GaAs/Al0.₃Ga0.₇As quantum wells for six different well widths w between 6 and 30 nm. The varying size quantization of the electron wave vector z-component 〈kz²〉∼(π/w)² influences β1=−γ〈kz²〉 linearly. The value of the bulk Dresselhaus coefficient γ=(−11±2) eVÅ³ was determined. We discuss the absolute sign of the Landé g factors and the effective momentum scattering times.
Gamma Ray Bursts Spectral--Energy correlations: recent results
Creators: name: Ghirlanda, Giancarlo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The correlations between the rest frame peak of the EF_E spectrum of GRBs Epeak and their isotropic energy (E_iso) or luminosity (L_iso) could have several implications for the understanding of the GRB prompt emission. These correlations are presently founded on the time-averaged spectral properties of a sample of 95 bursts, with measured redshifts, collected by different instruments in the last 13 years (pre-Fermi). One still open issue is wether these correlations have a physical origin or are due to instrumental selection effects. By studying 10 long and 14 short GRBs detected by Fermi we find that a strong time-resolved correlation between E_peak and the luminosity L_iso is present within individual GRBs and that it is consistent with the time-integrated correlation. This result is a direct proof of the existence in both short and long GRBs of a similar physical link between the hardness and the luminosity which is not due to instrumental selection effects. The origin of the E_peak-L_iso correlation should be searched in the radiation mechanism of the prompt emission.
description: 5 pages, 3 figures, to appear in the proceedings of the 275 IAU Symp: "Jets at all scales", Buenos Aires, Sept. 2010
Learning and quality improvement : nursing in the pediatric intensive care unit
Creators: name: Mosavian Pour, Mir Kaber
Publisher: name: University of British Columbia
Year: 2017

description: Maintaining a high quality of care in a Pediatric Intensive Care Unit (PICU) is a constant challenge. Continual 24/7 staffing, ongoing staff turnover, and the constant introduction of new equipment and procedures in a highly technologically-dependent unit requires continuous learning to deliver and improve the quality of children’s care. While all staff consider continuous learning important to maintaining and improving care, learning as quality improvement is made most explicit when new nursing staff are hired and incorporated into the PICU. In this dissertation, I investigated the process of learning by individuals in the interactive social environment of the PICU to answer the following questions: How does learning occur among the newly hired nurses in the PICU? And, how does learning contribute to quality improvement? In this mixed method inquiry, I employed ethnography, Social Network Analysis and simple descriptive and inferential statistical methods to explore process of learning among the newly hired nurses in Western Canada Hospital. I found that learning among newly hired nurses happened through face to face interactions in the context of two main activities: Orientation sessions and their Preceptorship. The most significant learning for the newly hired nurses, however, happened during their Preceptorship. Learning in the Preceptorship was social and experiential as they moved from legitimate peripheral participation in the multi-disciplinary and complementary social environment of the PICU into full participation as members of the PICU Community of Practice (CoP). This learning required the transformation and development of their individual and collective identity, as their preceptors, fellow nurses, and other staff employed scaffolding to mentor them through their constantly evolving Zone of Proximal Development (ZPD). Social and experiential learning activities became the basis for continuous quality improvement (CQI). I conclude that, in the PICU, quality improvement is the tangible manifestation and product of social and experiential learning. Rather than a sequence of corrective actions, in its most effective form, quality of care is improved through scaffolded ongoing learning activities in the authentic setting of a CoP. I recommend the unit to adopt a “learning together” sociocultural approach with scaffolding as key component for successful learning and CQI.
On Kapranov's description of $\overline{M}_{0,n}$ as a Chow quotient
Creators: name: Giansiracusa, Noah
name: Gillam, William D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14C05 (Primary) 14H10 (Secondary)

description: We provide a direct proof, valid in arbitrary characteristic, of the result originally proven by Kapranov over $\mathbb{C}$, that the Hilbert and Chow quotients $(\mathbb{P}^1)^n//PGL2$ are isomorphic to $\overline{M}_{0,n}$. In both cases this is done by explicitly constructing the universal family and then showing that the induced morphism is an isomorphism onto its image. The proofs of these results in many ways reduce to the case $n = 4$; in an appendix we outline a formalism of this phenomenon relating to certain operads.
description: 22 pages; published version
Bosonic Loop Diagrams as Perturbative Solutions of the Classical Field Equations in ϕ4-Theory
Creators: name: Finster, Felix
name: Tolksdorf, Jürgen
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 510 Mathematik

description: Solutions of the classical ϕ4-theory in Minkowski space-time are analyzed in a perturbation expansion in the nonlinearity. Using the language of Feynman diagrams, the solution of the Cauchy problem is expressed in terms of tree diagrams which involve the retarded Green's function and have one outgoing leg. In order to obtain general tree diagrams, we set up a “classical measurement process” in which a virtual observer of a scattering experiment modifies the field and detects suitable energy differences. By adding a classical stochastic background field, we even obtain all loop diagrams. The expansions are compared with the standard Feynman diagrams of the corresponding quantum field theory.
The effect of an electronic device designed to measure the degree of bending of the knee angle in developing the skill of catch and Clearance the high ball for football goalkeepers under (15 years)
Creators: name: Khalifa, Abbas Hussein
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 420701
subject: Biomechanics

description: The development taking place on the sports field at the general level and in the game of football at the private level, being the most popular game in the world, has reached very advanced stages. The use of modern aids and technology has contributed greatly to this development from the collective and individual aspects, as the goalkeeper is the most important position in the team, the use of devices gave objective readings about the goalkeeper's ability in terms of skill and physical aspects, as the importance of the research lies in designing an electronic device to measure the degree of bending of the knee angle because of its great importance in developing the skill of catching and dimensions of the high ball for football goalkeepers. The researchers chose a sample under the age of 15 years. Being an emerging age group, we consolidate the correct motor program for the skill to reach the best performance. The research aimed to prepare exercises using the device designed to develop the skill of catching and clearance the high ball, and also to identify the rate of development of the aforementioned skill. The research assumed that there were statistically significant differences in favor of the post-test results. The research sample was determined practically by (4) goalkeepers for the Iraqi Al-Zawra'a Club, where the researchers used the experimental approach, which is the approach that suits the nature of the research. The researchers concluded that the use of assistive means and electronic devices, including the designed device, contributed significantly to developing the skill of catching and clearance of the high ball through the exercises prepared on the device. The researchers recommend the use of modern technology and modern sports equipment in preparation for exercises, as it gives an accurate objective reading, which is the foundation stone for building exercises and measuring the rate of development .
The orbital-specific-virtual local coupled cluster singles and doubles method
Creators: name: Yang, Jun
name: Chan, Garnet Kin-Lic
name: Manby, Frederick R.
name: Schütz, Martin
name: Werner, Hans-Joachim
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: coupled cluster calculations, orbital calculations, perturbation theory
subject: 540 Chemie
subject: 31.15.bw

description: We extend the orbital-specific-virtual tensor factorization, introduced for local Møller-Plesset perturbation theory in Ref. [J. Yang, Y. Kurashige, F. R. Manby and G. K. L. Chan, J. Chem. Phys. 134, 044123 (2011)10.1063/1.3528935], to local coupled cluster singles and doubles theory (OSV-LCCSD). The method is implemented by modifying an efficient projected-atomic-orbital local coupled cluster program (PAO-LCCSD) described recently, [H.-J. Werner and M. Schütz, J. Chem. Phys. 135, 144116 (2011)10.1063/1.3641642]. By comparison of both methods we find that the compact representation of the amplitudes in the OSV approach affords various advantages, including smaller computational time requirements (for comparable accuracy), as well as a more systematic control of the error through a single energy threshold. Overall, the OSV-LCCSD approach together with an MP2 correction yields small domain errors in practical calculations. The applicability of the OSV-LCCSD is demonstrated for molecules with up to 73 atoms and realistic basis sets (up to 2334 basis functions). © 2012 American Institute of Physics
Simulasi numerik kekuatan rak roket portabel menggunakan metode elemen hingga
Creators: name: Wibawa, Lasinta Ari Nendra
name: Tuswan, Tuswan
Publisher: name: figshare
Year: 2022
Subjects: subject: 90502 Construction Engineering
subject: FOS: Civil engineering

description: This paper describes the design of a portable rocket rack and static stress analysis using numerical simulation. The portable rocket rack frame is designed to be able to carry 5 rockets. In this study, the load of each rocket was varied 150 kg, 175 kg, 200 kg, and 225 kg. The frame material for the portable rocket rack uses Aluminum 6061-T6. Numerical simulations were carried out with the help of Autodesk Inventor Professional software. The results of the static stress analysis show that the maximum von Mises stress for portable rocket racks for variations in loads of 150 kg, 175 kg, 200 kg and 225 kg, respectively, is 96.41 MPa, 112.5 MPa, 128.54 MPa, and 144.6 MPa. The portable rocket rack can withstand dynamic loads for each rocket of 200 kg because it has a safety factor of more than 2.
A new multiscale modeling method for simulating the loss processes in polymer solar cell nanodevices
Creators: name: Pershin, Anton
name: Donets, Sergii
name: Baeurle, Stephan A.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: charge injection, excitons, Monte Carlo methods, nanoelectronics, nanostructured materials, organic semiconductors, percolation, polymer blends, solar cells
subject: 540 Chemie
subject: 88.40.hj
subject: 88.40.jr

description: The photoelectric power conversion efficiency of polymer solar cells is till now, compared to conventional inorganic solar cells, still relatively low with maximum values ranging from 7% to 8%. This essentially relates to the existence of exciton and charge carrier loss phenomena, reducing the performance of polymer solar cells significantly. In this paper we introduce a new computer simulation technique, which permits to explore the causes of the occurrence of such phenomena at the nanoscale and to design new photovoltaic materials with optimized opto-electronic properties. Our approach consists in coupling a mesoscopic field-theoretic method with a suitable dynamic Monte Carlo algorithm, to model the elementary photovoltaic processes. Using this algorithm, we investigate the influence of structural characteristics and different device conditions on the exciton generation and charge transport efficiencies in case of a novel nanostructured polymer blend. More specifically, we find that the disjunction of continuous percolation paths leads to the creation of dead ends, resulting in charge carrier losses through charge recombination. Moreover, we observe that defects are characterized by a low exciton dissociation efficiency due to a high charge accumulation, counteracting the charge generation process. From these observations, we conclude that both the charge carrier loss and the exciton loss phenomena lead to a dramatic decrease in the internal quantum efficiency. Finally, by analyzing the photovoltaic behavior of the nanostructures under different circuit conditions, we demonstrate that charge injection significantly determines the impact of the defects on the solar cell performance.
Formalization of the data flow diagram rules for consistency check
Creators: name: Ibrahim, Rosziati
name: yen, Siow Yen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: aircc.org

description: In system development life cycle (SDLC), a system model can be developed using Data Flow Diagram (DFD). DFD is graphical diagrams for specifying, constructing and visualizing the model of a system. DFD is used in defining the requirements in a graphical view. In this paper, we focus on DFD and its rules for drawing and defining the diagrams. We then formalize these rules and develop the tool based on the formalized rules. The formalized rules for consistency check between the diagrams are used in developing the tool. This is to ensure the syntax for drawing the diagrams is correct and strictly followed. The tool automates the process of manual consistency check between data flow diagrams.
description: 17 pages
Development and pilot implementation of an activity-based emotional support intervention for caregivers of children with cancer
Creators: name: Kim, So Yoon
name: Kim, Seung Joo
name: Jo, Ye Ul
name: Ma, Youngeun
name: Yoo, Hee Jeong
name: Choi, Hyoung Soo
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: This study aimed to pilot PAX (“Play, Act & Interact”), an activity-based emotional support intervention for caregivers of child with cancer, which focuses on addressing their psychological distress and post-traumatic stress symptoms (PTSSs). Sixteen mothers whose children were child with cancer participated in this 4-week intervention. Their children (n = 16; 14 males; median age at diagnosis = 10.3 years; the median amount of time from diagnosis = 9 months) were at different treatment stages for a range of different diagnoses. Caregivers completed self-report instruments assessing their psychological distress including PTSSs and family functioning before and after the intervention and a brief open-response exit survey. Paired sample t-tests were computed to compare the pre-and post-intervention scores. The Post-traumatic Stress Disorder Checklist scores significantly decreased from pre- (M = 37.00, SD = 14.75) to post-intervention (M = 32.56, SD = 15.52), t(15) = 4.25, p < .001. There was also a significant difference between pre- (M = 33.5, SD = 3.18) and post-intervention (M = 35.7, SD = 3.14) scores on the Family Adherence subscale of the Family Adaptability and Cohesion Evaluation Scales III, t(15) = −2.58, p = .02. PAX was a promising intervention for supporting caregivers’ PTSSs and family adaptability. Future studies investigating the long-term effects and replicating the current study with more participants and a control group are needed.
Classical spins in topological insulators
Creators: name: Liu, Qin
name: Ma, Tianxing
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Following the recent theoretical proposal and experiment on quantum spin Hall effect in HgTe/CdTe quantum wells, we consider a single magnetic impurity localized in the bulk of the system, which we treat as a classical spin. It is shown that there are always localized excited states in the bulk energy gap for arbitrarily strong impurity strength in inverted region, while the localized excited states vanish for very strong impurity strength in normal region. Similar conclusion also applies to three-dimensional topological insulators. This distinct difference serves as another novel criterion for the conventional and topological insulating phases when the time-reversal symmetry is broken, and can be easily experimentally observed through the STM and/or ARPES experiments.
description: 5 pages, 4 figures.
NMR shielding tensors for density fitted local second-order Møller-Plesset perturbation theory using gauge including atomic orbitals
Creators: name: Loibl, Stefan
name: Schütz, Martin
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: approximation theory, biological NMR, DNA, electron correlations, Gaussian processes, molecular biophysics, nuclear screening, orbital calculations, perturbation theory
subject: 540 Chemie
subject: 87.15.M- Spectra of biomolecules
subject: 36.20.Kd Electronic structure and spectra
subject: 31.15.vq Electron correlation calculations for polyatomic molecules
subject: 31.15.xp Perturbation theory
subject: 87.14.gk DNA
subject: 87.15.ad Analytical theories

description: An efficient method for the calculation of nuclear magnetic resonance (NMR) shielding tensors is presented, which treats electron correlation at the level of second-order Møller-Plesset perturbation theory. It uses spatially localized functions to span occupied and virtual molecular orbital spaces, respectively, which are expanded in a basis of gauge including atomic orbitals (GIAOs or London atomic orbitals). Doubly excited determinants are restricted to local subsets of the virtual space and pair energies with an interorbital distance beyond a certain threshold are omitted. Furthermore, density fitting is employed to factorize the electron repulsion integrals. Ordinary Gaussians are employed as fitting functions. It is shown that the errors in the resulting NMR shielding constant, introduced (i) by the local approximation and (ii) by density fitting, are very small or even negligible. The capabilities of the new program are demonstrated by calculations on some extended molecular systems, such as the cyclobutane pyrimidine dimer photolesion with adjacent nucleobases in the native intrahelical DNA double strand (ATTA sequence). Systems of that size were not accessible to correlated ab initio calculations of NMR spectra before. The presented method thus opens the door to new and interesting applications in this area.