cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
An Experimental Examination of the Content of Persuasion Letters on Nonresponse Rates and Survey Estimates in a Nonresponse Follow-Up Study
Creators: name: Olson, Kristen
name: Lepkowski, James M.
name: Garabrant, David H.
Publisher: name: European Survey Research Association
Year: 2011
Subjects: survey research; nonresponse; nonresponse bias; persuasion letters

description: Nonresponse follow-up studies are often conducted to understand whether respondents and nonrespondents differ on survey variables of interest in sample surveys. Methods used to recruit respondents often differ between nonresponse follow-up studies and main studies. One method is persuasion letters sent from study staff to nonrespondents that are tailored to the types of concerns raised by the respondent and recorded in paradata about the survey recruitment process.  This study examined whether tailored persuasion letters yield higher response rates in nonresponse follow-up and whether respondents to a nonresponse follow-up differ depending on the content of the persuasion letter. Nonrespondents to the University of Michigan Dioxin Exposure Study, a survey of adults conducted in 2004 and 2005 in five counties in Michigan, were randomly assigned to either an appeal to help the community or tailored types of persuasion letters. No difference in response rates to the letter types was found, but meaningful differences in the survey variables appeared between nonrespondents responding to the follow-up and respondents to the main interview. These differences also occurred between the two groups receiving different types of letters.  The community appeal letter appeared to address unvoiced concerns and brought a different sample of nonrespondents compared to the tailored letters.
description: Survey Research Methods, Vol 5, No 1 (2011)
Phenomenology of the Zee model for Dirac neutrinos and general neutrino interactions
Creators: name: Calle, Julián
name: Restrepo, Diego
name: Zapata, Óscar
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Zee model for Dirac neutrinos is one of the simplest models featuring one-loop Dirac neutrino masses. The interactions between the new scalars (two singly-charged fields) and neutrinos induce general neutrino interactions (GNI) which, as a generalisation of the non standard neutrino interactions, constitute an additional tool to probe models beyond the SM like this. In this work, we consider a $U(1)_{B-L}$ gauge symmetry as the responsible for the Diracness of the neutrinos and the radiative character of the neutrino masses. We determine the viable parameter space consistent with neutrino oscillation data, leptonic rare decays and collider constraints, and establish the most relevant experimental prospects regarding lepton flavor violation searches and GNI in future solar neutrino experiments.
description: 14+5 pages, 6 figures and 3 tables
Transcription of a story about Verdena's grandmother working as a nanny
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-240308-04: Transcription of a story about Verdena's grandmother working as a nanny, file VP-131007-08, from 12:45 to 13:26.
The auto and cross angular power spectrum of the Cas A supernova remnant in radio and X-ray
Creators: name: Saha, Preetha
name: Bharadwaj, Somnath
name: Chakravorty, Susmita
name: Roy, Nirupam
name: Choudhuri, Samir
name: Günther, Hans Moritz
name: Smith, Randall K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The shell type supernova remnant (SNR) Cas A exhibits structures at nearly all angular scales. Previous studies show the angular power spectrum $(C_{\ell})$ of the radio emission to be a broken power law, consistent with MHD turbulence. The break has been identified with the transition from 2D to 3D turbulence at the angular scale corresponding to the shell thickness. Alternatively, this can also be explained as 2D inverse cascade driven by energy injection from knot-shock interactions. Here we present $C_{\ell}$ measured from archival VLA $5$GHz (C band) data, and Chandra X-ray data in the energy ranges ${\rm A}=0.6-1.0 \, \, {\rm keV}$ and ${\rm B} =4.2-6.0 \, \, {\rm keV}$, both of which are continuum dominated. The different emissions all trace fluctuations in the underlying plasma and possibly also the magnetic field, and we expect them to be correlated. We quantify this using the cross $C_{\ell}$ between the different emissions. We find that X-ray B is strongly correlated with both radio and X-ray A, however X-ray A is only very weakly correlated with radio. This supports a picture where X-ray A is predominantly thermal bremsstrahlung whereas X-ray B is a composite of thermal bremsstrahlung and non-thermal synchrotron emission. The various $C_{\ell}$ measured here, all show a broken power law behaviour. However, the slopes are typically shallower than those in radio and the position of the break also corresponds to smaller angular scales. These findings provide observational inputs regarding the nature of turbulence and the emission mechanisms in Cas A.
description: Accepted for publication in MNRAS
Transmissivity of geonets in secondary leachate collection systems of waste containment facilities
Creators: name: Choy, Harvey Wayne
Publisher: name: University of British Columbia
Year: 2009

description: The leak detection system of a waste containment facility may comprise of a geonet between two geomembranes. One of the main design parameters for such a system is the inplane flow capacity or transmissivity. Test devices with stress-controlled boundaries were specially designed and constructed to determine the flow capacity of such geosynthetic leak detection systems under different operating conditions. Two separate testing programs were performed. The Series W tests were performed over a period of 5 days at hydraulic gradients of 0.02, 0.04, 0.06, 0.08, and 0.10, and confining stresses of 25, 100, 200, 300, and 400 kPa; in addition, sedimentation tests were performed. This series of tests were performed to determine the influence that material properties, hydraulic gradient, and confining stress had on the transmissivity. Series WLC tests were performed at a constant hydraulic gradient of 0.02 and confining stress of 300 kPa for a period of 5 or 10 days and were intended to examine the long-term flow capacity. The series W test results indicate that increasing the hydraulic gradient increased the flow capacity, but not in a direct relationship because the flow regime in the geonet was semiturbulent to turbulent. Increasing the confining stress decreased the flow capacity as a result of geomembrane intrusion into the apertures of the geonet and compression of the geonet. Stiffer geomembranes showed less tendency to intrude into the pore space of a geonet, and geonets with narrower flow channels were less susceptible to intrusion from geomembanes. Geonets made of high density polyethylene, have high compressive strengths and tend to compress less. Extrapolation of the series WLC test results indicate that the flow capacity will decrease by 30% to 67% after a period of 28.5 years; a factor of safety for creep and intrusion of 1.75-3.0 may be appropriate, depending on material properties, for a performance period of about 30 years. Comparison of the data to granular soils indicate the geonets are approximately equivalent to 1/2 inch to 3/4 inch gravel and have a flow capacity equivalent to a 0.75 m thick layer of gravel possessing a hydraulic conductivity of 0.05-0.10 m/s. The results have some implications for materials testing; it is recommended that seating periods and orientation of test specimens be standardized. Boundaries of the test device should simulate field conditions, and be flexible to allow intrusion of adjacent construction materials into the geonet. A hydraulic gradient of 0.02 should be the minimum used in testing.
Extraction of a_nn from pi- d -> n n gamma
Creators: name: Gardestig, Anders
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: I present a calculation of the pi- d -> n n gamma reaction to third order in chiral perturbation theory. The short-distance physics of this reaction can be constrained by relating it to several important low-energy weak reactions. The theoretical error in a_nn extracted from this reaction can thus be reduced by a factor larger than three to +-0.05 fm.
description: 2 pages, 2 eps figures, uses ws-procs9x6.cls, summary of invited talk at Chiral Dynamics 2006, Sept. 18-22, Durham/Chapel Hill, NC, to be published in the proceedings
Two Measures for Sample Size Determination
Creators: name: Eichenberger, Philippe
name: Hulliger, Beat
name: Potterat, Jann
Publisher: name: European Survey Research Association
Year: 2011
Subjects: resolution; sample design; precision; relevance; small proportion; small group; small difference

description: Social surveys often must estimate the sizes or the proportions of many small groups and differences among them. The discussion of the needed precision of the estimators and the corresponding sample size is difficult, in particular when lay persons are involved. Two measures are developed which help in this discussion of the precision. These measures are called precision resolutions. The first of these measures, the size resolution, is derived from approximations to the probability of not observing a group  in a sample and the second measure, the difference resolution, addresses the difference of two proportions. The precision resolutions are operationalisations of the smallest group or difference which can be estimated from a sample. Since they embody elements of statistical hypothesis tests without the need of a complete test specification they are simple to specify and nevertheless contain the necessary elements for sample size determination. The precision resolutions lead to the determination of the sample size for simple random samples but extensions to more complex samples are possible with the help of the design effect. The precision resolutions were developed for the planning of the Swiss Population Survey and this survey as well as the European Social Survey serve as examples of their application.
description: Survey Research Methods, Vol 5, No 1 (2011)
Testing for measurement equivalence of individuals’ left-right orientation
Creators: name: Weber, Wiebke
Publisher: name: European Survey Research Association
Year: 2011
Subjects: left-right orientation; left-right response scale; response function; measurement invariance; multiple group confirmatory factor analysis

description: Subjective variables such as opinions, attitudes or preferences cannot be measured directly. Researchers have to rely on the answers people give in surveys, and whenever those answers shall be compared it is required that people answer these questions in the same way. Only then a concept can be used in different contexts. This paper deals with the measurement of the left-right concept: it analyses whether people make a distinction between a scale labelled 0 left and 10 right to one which is labelled 0 extreme left and 10 extreme right and tests whether the instrument is equivalent across groups. Following the three steps of invariance testing, configural, metric and scalar invariance, we find that the left-right response scale is on average equivalent across groups with different levels of political interest and different levels of education. This finding holds also in 23 of the 25 European countries tested, with the exception of the eastern part of Germany, Finland and France. In order to estimate how serious the difference between these two groups of countries is, we compare the observed means (which are affected by the difference) to the latent means (which are free of those effects), and the effect of the observed variable “attitude towards government’s intervention in the economy” on the observed variable “left-right self-placement” with the effect between these variables after correcting for scale difference. It was found that countries’ means can be compared but that the relationship with other variables might not be comparable among East Germany, Finland, France and the remaining countries.
description: Survey Research Methods, Vol 5, No 1 (2011)
Second-order topological modes in two-dimensional continuous media
Creators: name: Košata, Jan
name: Zilberberg, Oded
Publisher: name: arXiv
Year: 2021
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a symmetry-based scheme to create 0D second-order topological modes in continuous 2D systems. We show that a metamaterial with a \textit{p6m}-symmetric pattern exhibits two Dirac cones, which can be gapped in two distinct ways by deforming the pattern. Combining the deformations in a single system then emulates the 2D Jackiw-Rossi model of a topological vortex, where 0D in-gap bound modes are guaranteed to exist. We exemplify our approach with simple hexagonal, Kagome and honeycomb lattices. We furthermore formulate a quantitative method to extract the topological properties from finite-element simulations, which facilitates further optimization of the bound mode characteristics. Our scheme enables the realization of second-order topology in a wide range of experimental systems.
Determination of the orbital parameters of binary pulsars
Creators: name: Bhattacharyya, Bhaswati
name: Nityananda, Rajaram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a simple method for determination of the orbital parameters of binary pulsars, using data on the pulsar period at multiple observing epochs. This method uses the circular nature of the velocity space orbit of Keplerian motion and produces preliminary values based on two one dimensional searches. Preliminary orbital parameter values are then refined using a computationally efficient linear least square fit. This method works for random and sparse sampling of the binary orbit. We demonstrate the technique on (a) the highly eccentric binary pulsar PSR J0514-4002 (the first known pulsar in the globular cluster NGC 1851) and (b) 47 Tuc T, a binary pulsar with a nearly circular orbit.
description: 7 pages, 7 figures, 2 tables, Accepted by MNRAS, minor clarifications in references added
Estimating underreporting of consumer expenditures using Markov latent class analysis
Creators: name: Tucker, Clyde
name: Biemer, Paul P.
name: Meekins, Brian
Publisher: name: European Survey Research Association
Year: 2011
Subjects: underreporting error; consumer price index; missing data; survey evaluation

description: This paper examines reporting in specific consumer item categories (or commodities) and estimates expenditure underreporting due to survey respondents who erroneously report no expenditure in a category. Our approach for estimating underreporting errors is a two-step process. In the first step, a Markov latent class analysis is performed to estimate the proportion of consumers in various subpopulations who fail to report their actual expenditure in a particular commodity. Once this proportion is estimated, the dollar value of the missing expenditure is estimated using the mean expenditure of those in that subpopulation that did report an expenditure. Finally, the estimates are evaluated and discussed in light of external data on expenditure underreporting.
description: Survey Research Methods, Vol 5, No 2 (2011)
Figure S3 - S8: (Co)variance matrices and Gca from The genetic architecture of sexual dimorphism in the moss ceratodon purpureus
Creators: name: Kollar, Leslie M.
name: Kiel, Scott
name: James, Ashley J.
name: Carnley, Cody T.
name: Scola, Danielle N.
name: Clark, Taylor N.
name: Tikahari Khanal
name: Rosenstiel, Todd N.
name: Gall, Elliott T.
name: Grieshop, Karl
name: McDaniel, Stuart F.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Plant Biology

description: Figures including genetic covariances and correlation matrices for Gmf for both models. Gca for each model is also presented in table form.
Phase solitons in a weakly coupled three-component superconductor
Creators: name: Yerin, Yuriy
name: Drechsler, Stefan-Ludwig
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Based on the phenomenological Ginzburg-Landau approach, we investigate phase solitonic states in a class of three-component superconductors for mesoscopic doubly-connected geometry (thin-walled cylinder) in external magnetic fields. Analysis of the Gibbs free energy of the system shows that solitonic states in a three-component superconductor are thermodynamically metastable and separated from the ground state by a sizable energy. Our results demonstrate that despite of the presence of the zoo of phase solitons states earlier proposed method [Phys. Rev. B 96, 144513 (2017)] for the detection of BTRS in multiband superconductors remains valid and useful.
description: 10 pages, 7 figures accepted version for the publication
Reports of relationship timing: Missing data and couple agreement
Creators: name: Reimondos, Anna
name: Evans, Ann
name: Gray, Edith
Publisher: name: European Survey Research Association
Year: 2011
Subjects: Survey; recall error; retrospective data

description: In studying changes in family formation over time, social researchers and demographers have primarily relied on retrospective and prospective marital and cohabitation histories collected from surveys.  With the increasing use of these types of retrospective questions in surveys, social researchers have now begun to pay more attention to the quality of the data and the degree of accuracy with which respondents are able to remember past events. The purpose of this paper is to explore the incidence and demographic and socio-economic correlates of recall error and inaccuracy of reporting of marriage and cohabitation dates. In the first part we investigate the degree of precision with which dates are remembered using both descriptive and multivariate analysis. We then compare married and cohabiting  partner's reports about when their relationship started in order to check the consistency of with which both partners date the same event.
description: Survey Research Methods, Vol 5, No 2 (2011)
Fluctuation-dissipation relations in plaquette spin systems with multi-stage relaxation
Creators: name: Jack, Robert L.
name: Berthier, Ludovic
name: Garrahan, Juan P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study aging dynamics in two non-disordered spin models with multi-spin interactions, following a sudden quench to low temperature. The models are relevant to the physics of supercooled liquids. Their low temperature dynamics resemble those of kinetically constrained models, and obey dynamical scaling, controlled by zero-temperature critical points. Dynamics in both models are thermally activated, resulting in multi-stage relaxation towards equilibrium. We study several two-time correlation and response functions. We find that equilibrium fluctuation-dissipation relations are generically not satisfied during the aging regime, but deviations from them are well described by fluctuation-dissipation ratios, as found numerically in supercooled liquids. These ratios are purely dynamic objects, containing information about the nature of relaxation in the models. They are non-universal, and can even be negative as a result of activated dynamics. Thus, effective temperatures are not well-defined in these models.
description: 29 pages, 10 figs
Τεχνολογίες Μάθησης & Μοντέλο Εκπαιδευτικού Σχεδιασμού Ανάπτυξης Κινήτρων ARCS: Μελέτη Περίπτωσης Διαδικτυακού Σεμιναρίου
Creators: name: Καρανικόλα, Χριστίνα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Μοντέλο Ανάπτυξης Κινήτρων ARCS
Στρατηγικές Ανάπτυξης Κινήτρων
Εκπαιδευτικός Σχεδιασμός
ARCS Model of Motivation
Instructional Design
Distance Learning

description: Ο τρόπος παραγωγής πρωτότυπου εκπαιδευτικού υλικού ικανού να διεγείρει το ενδιαφέρον των εκπαιδευομένων, να πείθει τους εκπαιδευομένους πως σχετίζεται με τις μοναδικές ανάγκες και τα ενδιαφέροντά τους, να ενισχύει την αυτοπεποίθηση των εκπαιδευομένων δημιουργώντας θετικές προσδοκίες για επιτυχία και να ικανοποιεί τους εκπαιδευομένους, αποτελεί το ζητούμενο για κάθε εκπαιδευτή που συνδιαλέγεται με το εκπαιδευόμενο κοινό του είτε δια ζώσης είτε σε εξ αποστάσεως εκπαιδευτικά περιβάλλοντα. Στα πλαίσια εκπόνησης της παρούσας Μεταπτυχιακής Διπλωματικής Εργασίας (ΜΔΕ) δημιουργήθηκε ένα διαδικτυακό σεμινάριο για το Digital Messaging βασισμένο στο μοντέλο εκπαιδευτικού σχεδιασμού ανάπτυξης κινήτρων ARCS του John Keller το οποίο απευθύνεται σε όσους επαγγελματίες έχουν ανάγκη να είναι ενημερωμένοι αναφορικά με τις τελευταίες εξελίξεις στον κλάδο του Digital Messaging, προκειμένου να διερευνηθεί κατά πόσο ο εκπαιδευτικός σχεδιασμός του μοντέλου ανάπτυξης κινήτρων ARCS και η ταυτόχρονη αξιοποίηση τεχνολογιών μάθησης που ευθυγραμμίζονται με τις στρατηγικές του μοντέλου, επιδρούν θετικά στην ενίσχυση των κινήτρων των εκπαιδευομένων που παρακολουθούν εξ αποστάσεως το διαδικτυακό σεμινάριο που έχει διαμορφωθεί στην πλατφόρμα Moodle. Μέσα από την μελέτη περίπτωσης του διαδικτυακού σεμιναρίου «Εισαγωγή στο Digital Messaging» επιβεβαιώνεται η σημαντική επίδραση του μοντέλου ανάπτυξης κινήτρων ARCS, που χρησιμοποιείται στον σχεδιασμό και υλοποίηση του διαδικτυακού εκπαιδευτικού υλικού, στην ανάπτυξη κινήτρων των εκπαιδευομένων καθώς και η επίδρασή του σε κάθε επιμέρους συνιστώσα του μοντέλου
description: Finding the finest way for producing original instructional material fit to stimulate learners' interest, to convince trainees that is related to their unique needs and interests, to enhance learners' self-confidence and to build positive expectations for success and satisfaction, is crucial for any instructor in need to interact effectively with his/her audience online or live within a classroom. In this study, the "Introduction to Digital Messaging" webinar is designed and implemented based on the ARCS instructional design model for motivation in order to investigate whether the educational design of the ARCS development model and the simultaneous use of learning technologies that are in line with the ARCS strategies, have a positive impact on enhancing the motivation of learners in a distance learning environment that has been set up on the Moodle platform. The study reiterated that there is significant impact on the motivation of learners when the ARCS model is used during the design and implementation of the online educational material
On the Number of Equilibria Balancing Newtonian Point Masses with a Central Force
Creators: name: Arustamyan, Nickolas
name: Cox, Christopher
name: Lundberg, Erik
name: Perry, Sean
name: Rosen, Zvi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 70F10

description: We consider the critical points (equilibria) of a planar potential generated by $n$ Newtonian point masses augmented with a quadratic term (such as arises from a centrifugal effect). Particular cases of this problem have been considered previously in studies of the circular restricted $n$-body problem. We show that the number of equilibria is finite for a generic set of parameters, and we establish estimates for the number of equilibria. We prove that the number of equilibria is bounded below by $n+1$, and we provide examples to show that this lower bound is sharp. We prove an upper bound on the number of equilibria that grows exponentially in $n$. In order to establish a lower bound on the maximum number of equilibria, we analyze a class of examples, referred to as ``ring configurations'', consisting of $n-1$ equal masses positioned at vertices of a regular polygon with an additional mass located at the center. Previous numerical observations indicate that these configurations can produce as many as $5n-5$ equilibria. We verify analytically that the ring configuration has at least $5n-5$ equilibria when the central mass is sufficiently small. We conjecture that the maximum number of equilibria grows linearly with the number of point masses. We also discuss some mathematical similarities to other equilibrium problems in mathematical physics, namely, Maxwell's problem from electrostatics and the image counting problem from gravitational lensing.
description: 16 pages, 1 figure
Testing generalized logotropic models with cosmic growth
Creators: name: Boshkayev, Kuantay
name: Konysbayev, Talgar
name: Luongo, Orlando
name: Muccino, Marco
name: Pace, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We check the dynamical and observational features of four typologies of logotropic dark energy models, leading to a \emph{thermodynamic cosmic speed up} fueled by a single fluid that unifies dark energy and dark matter. We first present two principal Anton-Schmidt fluids where the Grüneisen parameter $γ_{\rm G}$ is free to vary and then fixed to the special value $γ_{\rm G}=\tfrac{5}{6}$. We also investigate the pure logotropic model, corresponding to $γ_{\rm G}=-\frac{1}{6}$. Finally, we propose a new logotropic paradigm that works as a generalized logotropic fluid, in which we split the role of dark matter and baryons. We demonstrate that the logotropic paradigms may present drawbacks in perturbations, showing a negative adiabatic sound speed which make perturbations unstable. The Anton-Schmidt model with $γ_{\rm G}=\frac{5}{6}$ is ruled out while the generalized logotropic fluid seems to be the most suitable one, albeit weakly disfavored than the $Λ$CDM model. We combine low- and higher-redshift domains through experimental fits based on Monte Carlo Markov Chain procedures, taking into account supernovae Ia catalogue, Hubble measurements and $σ_8$ data points. We consider two model selection criteria to infer the statistical significance of the four models. We conclude there is statistical advantage to handle the Anton-Schmidt fluid with the Grüneisen parameter free to vary and/or fixed to $γ_{\rm G}=-\frac{1}{6}$. The generalized logotropic fluid indicates suitable results, statistically favored than the other models, until the sound speed is positive, becoming unstable in perturbations elsewhere. We emphasize that the $Λ$CDM paradigm works statistically better than any kinds of logotropic and generalized logotropic models, while the Chevallier-Polarski-Linder parametrization is statistically comparable with logotropic scenarios.
description: 15 pages, 3 tables, 4 figures. It matches the published version
Construction of Whiskers for the Quasiperiodically Forced Pendulum
Creators: name: Stenlund, Mikko
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 70K43, Secondary 37J40, 37D10, 70H08, 70K44

description: We study a Hamiltonian describing a pendulum coupled with several anisochronous oscillators, giving a simple construction of unstable KAM tori and their stable and unstable manifolds for analytic perturbations. We extend analytically the solutions of the equations of motion, order by order in the perturbation parameter, to a uniform neighbourhood of the time axis.
description: 50 pages
The Conformal Anomaly Action to Fourth Order (4T) in $d=4$ in Momentum Space
Creators: name: Corianò, Claudio
name: Maglio, Matteo Maria
name: Theofilopoulos, Dimosthenis
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We elaborate on the structure of the conformal anomaly effective action up to 4-th order, in an expansion in the gravitational fluctuations $(h)$ of the background metric, in the flat spacetime limit. For this purpose we discuss the renormalization of 4-point functions containing insertions of stress-energy tensors (4T), in conformal field theories in four spacetime dimensions with the goal of identifying the structure of the anomaly action. We focus on a separation of the correlator into its transverse/traceless and longitudinal components, applied to the trace and conservation Ward identities (WI) in momentum space. These are sufficient to identify, from their hierarchical structure, the anomaly contribution, without the need to proceed with a complete determination of all of its independent form factors. Renormalization induces sequential bilinear graviton-scalar mixings on single, double and multiple trace terms, corresponding to $R\square^{-1}$ interactions of the scalar curvature, with intermediate virtual massless exchanges. These dilaton-like terms couple to the conformal anomaly, as for the chiral anomalous WIs. We show that at 4T level a new traceless component appears after renormalization. We comment on future extensions of this result to more general backgrounds, with possible applications to non local cosmologies.
description: 61 pages, 3 figures. Text improved. Typos corrected. New references added. To appear in EPJ
Discussion of traditional medicine
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-240308-03: Discussion of traditional medicine, mostly in English but with some Hupa vocabulary (such as words for plants) interspersed.
Transcription of a story about Verdena's grandmother working as a nanny
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-230308-11: Transcription of a story about Verdena's grandmother working as a nanny, file VP-131007-08, from the beginning of the story at 11:45 to 12:45.
Seismic behavior and design of friction concentrically braced frames for steel buildings
Creators: name: Tremblay, Robert
Publisher: name: University of British Columbia
Year: 2009

description: This study explores the possibility of improving the seismic response of concentrically braced frames (CBFs) by including friction connections at the end of the bracing members. These connections will slip at a predetermined load level in order to absorb and dissipate by friction most of the energy input by earthquake ground motions, and then avoid yielding and buckling of the bracing members. The characteristics of CBFs and other alternative systems are reviewed and a FCBF system is proposed which includes bolted brace connections with slotted holes in the gusset plates. 42 connection samples including various faying surface materials and bolting configurations were subjected to dynamically applied cyclic loading. These tests revealed that a stable response can be achieved by using proper sliding material together with an appropriate bolt clamping force level. The behavior of a full-scale braced frame assembly undergoing severe interstorey drifts was also investigated. The results of the quasi-static tests performed showed that the system behaves in a very predictable and satisfactory manner. An analytical study including nonlinear dynamic analyses of typical single- and multi-storey FCBFs was then performed in order to develop design guidelines for their stability under seismic loading. For single-storey buildings with a rigid roof diaphragm, design spectra were developed for predicting the ductility demand and the threshold of instability. For single-storey structures with a flexible roof diaphragm, a case study including 48 buildings revealed that this type of structure experiences more significant nonlinear response than the equivalent SDOF system. Analyses of eight braced frames varying from 2 to 12 storeys in height showed that instability in multi-storey FCBFs occurs in a collapse mechanism involving only a few stories. Such phenomena can be inhibited by providing the columns in the building with sufficient bending strength and stiffness. Values were proposed for the stiffness which appeared to yield a stable response of the frames. Columns designed solely for gravity loads were found to have sufficient strength for sustaining the moments likely to develop during ground motions. Design criteria for the brace induced column loads and for the loads acting in the collecting elements were also proposed.
Household survey panels: how much do following rules affect sample size?
Creators: name: Schonlau, Matthias
name: Watson, Nicole
name: Kroh, Martin
Publisher: name: European Survey Research Association
Year: 2011
Subjects: survey panels; survey methodology

description: In household panels, typically all household members are surveyed. Because household composition changes over time, so-called following rules are implemented to decide whether to continue surveying household members who leave the household (e.g. former spouses/partners, grown children) in subsequent waves. Following rules have been largely ignored in the literature leaving panel designers unaware of the breadth of their options and forcing them to make ad hoc decisions. In particular, to what extent various following rules affect sample size over time is unknown. From an operational point of view such knowledge is important because sample size greatly affects costs. Moreover, the decision of whom to follow has irreversible consequences as finding household members who moved out years earlier is very difficult.

We find that household survey panels implement a wide variety of following rules but their effect on sample size is relatively limited for a couple of decades. Even after 25 years, the rule "follow only wave 1 respondents" still captures 85% of the respondents of the rule "follow everyone who can be traced back to a wave 1 household through living arrangements" in the SOEP. Once children of permanent sample members start moving out, following such children greatly affects sample size. This effect is noticeable after 25 years in the PSID. Unless attrition is low, there is no danger of an ever expanding panel because even wide following rules do not typically exceed attrition.

Grown children of permanent sample members with their own households have a significantly lower attrition rate than first wave respondents in the PSID. Presence of a spouse or a child in a household does not affect attrition; however, presence of other household members significantly increases attrition.
description: Survey Research Methods, Vol 5, No 2 (2011)
Two characterizations of the grid graphs
Creators: name: Gebremichel, Brhane
name: Cao, Meng-Yue
name: Koolen, Jack H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C50 (Primary), 05E99 (secondary)

description: In this paper we give two characterizations of the $p \times q$-grid graphs as co-edge-regular graphs with four distinct eigenvalues.
description: 18 pages, 1 table
Rapidity dependence of hadron production in central Au+Au collisions at $\sqrt{s_{NN}}= 200$ GeV
Creators: name: Song, Jun
name: Shao, Feng-lan
name: Xie, Qu-bing
name: Wang, Yun-fei
name: Wei, De-ming
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The rapidity and transverse momentum spectra for identified hadrons in central Au+Au collisions at $\sqrt{s_{NN}}= 200$ GeV are computed in a quark combination model. The data of rapidity distributions for $π^{\pm}$, $K^{\pm}$, $p(\bar{p})$ and net protons $(p-\bar{p})$ are well described. We also predict rapidity distributions for $K^{0}_{s}$, $Λ(\barΛ)$, $\mathrm{Ξ^{-}}$ ($\mathrm{\barΞ^{_+}}$) and $\mathrm{Ω^{-}}+\mathrm{\barΩ}^{_+}$. The multiplicity ratios of charged antihadrons to hadrons as a function of rapidity are reproduced. The results for ${p}_{T}$ spectra of $π^{\pm}$, $K^{\pm}$, $p(\bar{p})$ and for the $p/π$ ratios in a broader ${p}_{T}$ range agree well with the data. Finally the rapidity dependence of transverse momentum distributions for hadrons are given.
description: 10 pages,11figures,3 tables
Synthesis of TiO2/Bi-MOFs composites with excellent performance for enhanced visible-light driven photocatalytic activity to remove organic contaminants
Creators: name: Dong, Shanghai
name: Wang, Liying
name: Lou, Weiyi
name: Shi, Yunxin
name: Li, Lu
name: Cao, Zhenzhu
name: Zhang, Yongfeng
name: Sun, Junmin
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences

description: Nowadays, more and more regions of the earth are facing energy crisis and environmental pollution issues. Photocatalytic technology converts solar energy into chemical energy in an environmentally friendly way, which is considered as an effective method to solve such issues. In this work, a series of TiO2/Bi-MOFs (TiO2/Bismuth based metal-organic frameworks) composites were successfully prepared by a simple one-pot solvothermal method, and the photocatalytic activity of the composites was evaluated by photocatalytic degradation of rhodamine B (RhB) dye under visible light, and the catalytic activities of the samples were also investigated for methyl orange (MO), methylene blue (MB) and tetracycline (TC). The samples were characterized by using various analytical techniques. The composites exhibited better catalytic properties compared with the original single component, which was attributed to the high dispersion of TiO2 and the synergistic effect of efficient interfacial charge transfer between TiO2 and Bi-BTC (BTC: benzene-1,3,5-tricarboxylate, Scheme 1). Among the results, the photocatalytic degradation efficiencies of 25-T/B (T/B, TiO2/Bi-BTC: TiO2/bismuth homobenzotrizoate composites), 35-T/D (T/D, TiO2/Bi-BDC: TiO2/bismuth terephthalate composites) and 25-T/P (T/P, TiO2/Bi-BPDC: TiO2/bismuth biphenyldicarboxylate composites) for RhB were all 99% after 40 min of visible light irradiation. Furthermore, the degradation efficiency of 25-T/B for RhB could maintain high catalytic activity after five cycles, indicating the high stability of the catalyst. Overall, the materials presented in this work are a series of reusable, high catalytic activity and economical photocatalysts for water purification, and the effects of different ligands on the photocatalytic activity of TiO2/Bi-MOFs composites were investigated.
Σύνθεση, χαρακτηρισμός και μελέτη φωταυγών μεταλλοργανικών πλεγμάτων λανθανιδών
Creators: name: Ανδριώτου, Δέσποινα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Μεταλλο-οργανικά πλέγματα
Σπάνιες γαίες
Φωταύγεια
Metal-Organic Frameworks
Rare earth metals
Luminescence

description: Τα τελευταία χρόνια παρατηρείται μεγάλο ενδιαφέρον προς τη σύνθεση μεταλλο-οργανικών πλεγμάτων με ιόντα λανθανιδών, τα οποία μελετώνται για τις φωταυγείς τους ιδιότητες. Πρώτος σκοπός της παρούσας εργασίας είναι η σύνθεση τέτοιων πλεγμάτων για την παραγωγή φωτός. Αυτό επιτυγχάνεται μετά από doping στα MOF με τρισθενή ιόντα Eu3+ και Tb3+, αλλά και με άμινο παράγωγα των ligand που χρησιμοποιήθηκαν στη σύνθεση, συγκεκριμένα των 1,4-benzenedicarboxylic acid (H2bdc) και biphenyl-4,4’-dicarboxylic acid (H2bpdc). Το χρώμα του φωτός που εκπέμπεται ρυθμίζεται ανάλογα με την προσεκτική προσαρμογή των σχετικών συγκεντρώσεων των επιμέρους συστατικών και ακόμα και μετά από το doping, τα MOF παραμένουν φωτεινά και εκτιμώνται σχετικά μεγάλοι χρόνοι ζωής της φωταύγειάς τους. Επιπλέον, μερικά από αυτά βρέθηκαν να έχουν εξαιρετικό ενδιαφέρον και ως αισθητήρες θερμοκρασίας. Δεύτερος σκοπός της εργασίας είναι η σύνθεση μεταλλο-οργανικών πλεγμάτων λανθανιδών που, μετά από διέγερση στο ορατό, εκπέμπουν στο εγγύς υπέρυθρο και η μελέτη τους για πιθανή μελλοντική χρήση σε απεικονιστικές τεχνικές
description: In recent years, there is an increasing number of Metal Organic Frameworks (MOFs), studied due to their luminescent properties. One purpose of this study is the synthesis of luminescent Lanthanide Metal-Organic Frameworks (LnMOFs) for color tuning and generation of white and yellow light. This can be achieved not only through doping of the parent MOF with the trivalent lanthanide ions, Eu3+ and Tb3+, but also with the amino substitutes of the ligands, 1,4-benzenedicarboxylic acid (H2bdc) and biphenyl-4,4’-dicarboxylic acid (H2bpdc). With careful adjustment of the relative concentration of the lanthanide ions and bridging ligands, the color of the luminescence can be modulated while these coordinated polymers seem to be extremely promising in the field of color tuning, as even after the double doping, they remain bright and relatively long lifetimes are obtained. Some of them also found to be promising as temperature sensors. Another purpose of this study is the synthesis of MOFs emitting in the near-infrared region, after excitation in the visible range, which can be possibly utilized in the future for bio-imaging applications
Baryon axial vector current in large-$N_c$ chiral perturbation theory: Complete analysis for $N_c=3$
Creators: name: Flores-Mendieta, Ruben
name: Garcia, Carlos Isaac
name: Hernandez, Johann
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The baryon axial vector current is computed in heavy baryon chiral perturbation theory in the large-$N_c$ limit, where $N_c$ is the number of color charges. One-loop nonanalytic corrections of order $m_q \ln m_q$ are comprised in the analysis, with contributions of both intermediate octet and decuplet baryon states, to all orders in the $1/N_c$ expansion of the axial vector current relevant for $N_c=3$. Theoretical expressions are obtained in the limit of vanishing decuplet-octet mass difference only, which allows one to carry out a full comparison with conventional heavy baryon chiral perturbation theory results for three flavors of light quarks and at the physical value $N_c=3$. Both approaches perfectly agree to all orders considered. Furthermore, a numerical analysis via a least-squares fit is performed in order to extract the values of the free parameters of the theory, using the experimental data available. The predictions of formalism are remarkable.
description: 48 pages, 1 figure, 8 tables
Measurement Quality in Indicators of Compositions. A Compositional Multitrait-Multimethod Approach
Creators: name: Coenders, Germà
name: Hlebec, Valentina
name: Kogovšek, Tina
Publisher: name: European Survey Research Association
Year: 2011
Subjects: compositional data; ipsative data; multitrait-multimethod; correlated uniqueness model; social networks

description: Compositional data, also called multiplicative ipsative data, are common in survey research instruments in areas such as time use, budget expenditure and social networks. Compositional data are usually expressed as proportions of a total, whose sum can only be 1. Owing to their constrained nature, statistical analysis in general, and estimation of measurement quality with a confirmatory factor analysis model for multitrait-multimethod (MTMM) designs in particular are challenging tasks. Compositional data are highly non-normal, as they range within the 0-1 interval. One component can only increase if some other(s) decrease, which results in spurious negative correlations among components which cannot be accounted for by the MTMM model parameters.

In this article we show how researchers can use the correlated uniqueness model for MTMM designs in order to evaluate measurement quality of compositional indicators. We suggest using the additive log ratio transformation of the data, discuss several approaches to deal with zero components and explain how the interpretation of MTMM designs differs from the application to standard unconstrained data.

We show an illustration of the method on data of social network composition expressed in percentages of partner, family, friends and other members in which we conclude that the face-to-face collection mode is generally superior to the telephone mode, although primacy effects are higher in the face-to-face mode. Compositions of strong ties (such as partner) are measured with higher quality than those of weaker ties (such as other network members).
description: Survey Research Methods, Vol 5, No 2 (2011)
The Application of Factorial Surveys in General Population Samples: The Effects of Respondent Age and Education on Response Times and Response Consistency
Creators: name: Sauer, Carsten
name: Auspurg, Katrin
name: Hinz, Thomas
name: Liebig, Stefan
Publisher: name: European Survey Research Association
Year: 2011
Subjects: factorial survey; vignettes; response time; response consistency; cognitive load

description: Over the last decade, there has been a marked increase in the number of studies on attitude and decision research which use the factorial survey (FS) design. The FS integrates experimental set-ups into a survey: respondents react to hypothetical descriptions (vignettes) while the values of each attribute (dimension) of these descriptions systematically vary in order to estimate their impact on respondent judgments. As the vignettes are based on a number of dimensions and as respondents evaluate several vignettes, FSs are demanding in terms of individual cognitive and information-processing abilities. So far, there is little empirical knowledge of whether and to what extent this complexity is feasible in general population samples with heterogeneous respondents. Using data from a study on the fairness of earnings (with a mixed mode sample consisting a computer assisted personal interview [CAPI], computer assisted self interview [CASI], and paper and pencil [PAPI] mode), the complexity of FSs is analyzed in terms of: 1) design dimensions, such as the number of vignette dimensions (five, eight, or 12) and the number of vignettes for single respondents (10, 20, or 30), which were varied in a 3x3 experimental design; and 2) respondent characteristics that are associated with cognitive abilities (age and education). Two different indicators for cognitive load as well as learning and fatigue effects are analyzed: 1) latency time and 2) response consistency. The results show that raw reaction times but not latency times are longer for older respondents, suggesting that the cognitive effort needed for the evaluation of vignettes is not particularly high. Consistency measures reveal that respondents with a lower educational level show greater inconsistency in their evaluations when the number of vignettes is high. The number of dimensions has an effect on consistency only when respondents have to rate a large number of vignettes. In short, the results demonstrate that FSs are applicable in general population samples but should be used with a limited number of vignettes and dimensions per respondent.
description: Survey Research Methods, Vol 5, No 3 (2011)