cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Absolutely Continuous Spectrum for Quantum Trees
Creators: name: Anantharaman, Nalini
name: Ingremeau, Maxime
name: Sabri, Mostafa
name: Winn, Brian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81Q10, 34B45 (Primary), 47B80 (Secondary)

description: We study the spectra of quantum trees of finite cone type. These are quantum graphs whose geometry has a certain homogeneity, and which carry a finite set of edge lengths, coupling constants and potentials on the edges. We show the spectrum consists of bands of purely absolutely continuous spectrum, along with a discrete set of eigenvalues. Afterwards, we study random perturbations of such trees, at the level of edge length and coupling, and prove the stability of pure AC spectrum, along with resolvent estimates.
description: 48 pages, 2 figures
Performance standards and employee effort : Evidence from teacher absences
Creators: name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: The 2001 No Child Left Behind Act (NCLB) increased accountability pressure in U.S. public schools by threatening to impose sanctions on Title-1 schools that failed to make Adequate Yearly Progress (AYP) in consecutive years. Difference-in-difference estimates of the effect of failing AYP in the first year of NCLB on teacher effort in the subsequent year suggest that on average, teacher absences in North Carolina fell by about 10% and the probability of being absent 15 or more times fell by about 20%. Reductions in teacher absences were driven by within-teacher increases in effort.
Hypervelocity Stars in the Gaia era. Revisiting the most extreme stars from the MMT survey
Creators: name: Kreuzer, S.
name: Irrgang, A.
name: Heber, U.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The hypervelocity star (HVS) survey conducted at the Multiple Mirror Telescope (MMT) identified 42 B-type stars in the Galactic halo whose radial velocity in the Galactic rest-frame exceeds $+275\,$km$\,$s${}^{-1}$. In order to unravel the nature and origin of those high-velocity outliers, their complete six-dimensional phase space information is needed. To this end, we complemented positions and proper motions from the second data release of {\it Gaia} with revised radial velocities and spectrophotometric distances that are based on a reanalysis of the available MMT spectra of 40 objects using state-of-the-art model spectra and a tailored analysis strategy. The resulting position and velocity vectors for 37 stars were then used as input for a subsequent kinematic investigation to obtain as complete a picture as possible. The combination of projected rotational velocity, position in the Kiel diagram, and kinematic properties suggests that all objects in the sample except two (B576, B598) are very likely to be main sequence stars. While the available data are still not precise enough to constrain the place of origin for 19 program stars, we identified eight objects that either come from the outer rim of the Galactic disk or not from the disk at all, along with ten that presumably stem from the Galactic disk. For almost all of those 18 targets with more or less well-constrained spatial origin, the Galactic center (GC) is disqualified as a possible place of origin. The most notable exception is B576, the origin of which coincides extremely well with the GC when assuming a blue horizontal branch (BHB) nature for it. HVS$\,$22 is by far the most extreme object in the sample. Although its origin is completely unconstrained, an ejection from the GC by the Hills mechanism is the most plausible explanation for its current Galactic rest-frame velocity of $1530^{+690}_{-560}\,$km$\,$s${}^{-1}$.
Food Frequency consumption questionnaire: Cross-sectional study of consumption patterns of fish, fruits, and vegetables among households in Ado-Ekiti, Nigeria: frequency, quantity, and modes of intake
Creators: name: Laoye, Babafemi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420603
subject: Health promotion

description: Food Frequency consumption questionnaire
Performance standards and employee effort : Evidence from teacher absences
Creators: name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: The 2001 No Child Left Behind Act (NCLB) increased accountability pressure in U.S. public schools by threatening to impose sanctions on Title-1 schools that failed to make Adequate Yearly Progress (AYP) in consecutive years. Difference-in-difference estimates of the effect of failing AYP in the first year of NCLB on teacher effort in the subsequent year suggest that on average, teacher absences in North Carolina fell by about 10% and the probability of being absent 15 or more times fell by about 20%. Reductions in teacher absences were driven by within-teacher increases in effort.
The turbulent spectrum created by non-Abelian plasma instabilities
Creators: name: Arnold, Peter
name: Moore, Guy D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recent numerical work on the fate of plasma instabilities in weakly-coupled non-Abelian gauge theory has shown the development of a cascade of energy from long to short wavelengths. This cascade has a steady-state spectrum, analogous to the Kolmogorov spectrum for turbulence in hydrodynamics or for energy cascades in other systems. In this paper, we theoretically analyze processes responsible for this cascade and find a steady-state spectrum f_k ~ k^-2, where f_k is the phase-space density of particles with momentum k. The exponent -2 is consistent with results from numerical simulations. We also discuss implications of the emerging picture of instability development on the "bottom-up" thermalization scenario for (extremely high energy) heavy ion collisions, emphasizing fundamental questions that remain to be answered.
description: 17 pages, 5 figures
Task-based, GPU-accelerated and Robust Library for Solving Dense Nonsymmetric Eigenvalue Problems
Creators: name: Myllykoski, Mirko
name: Mikkelsen, Carl Christian Kjelgaard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Software (cs.MS)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: In this paper, we present the StarNEig library for solving dense nonsymmetric standard and generalized eigenvalue problems. The library is built on top of the StarPU runtime system and targets both shared and distributed memory machines. Some components of the library have support for GPU acceleration. The library is currently in an early beta state and supports only real matrices. Support for complex matrices is planned for a future release. This paper is aimed at potential users of the library. We describe the design choices and capabilities of the library, and contrast them to existing software such as ScaLAPACK. StarNEig implements a ScaLAPACK compatibility layer which should assist new users in the transition to StarNEig. We demonstrate the performance of the library with a sample of computational experiments.
description: 18 pages, 11 figures (18 when counting sub-figures), 1 tex-files. Invited article submitted to Concurrency and Computation: Practice and Experience. Second author's first name is "Carl Christian" and last name "Kjelgaard Mikkelsen"
X-ray, Radio, and Optical Observations of the Putative Pulsar in the Supernova Remnant CTA 1
Creators: name: Halpern, J. P.
name: Gotthelf, E. V.
name: Camilo, F.
name: Helfand, D. J.
name: Ransom, S. M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A Chandra image of the central X-ray source RX J0007.0+7303 in the supernova remnant CTA 1 reveals a point source, a compact nebula, and a bent jet, all of which are characteristic of energetic, rotation-powered pulsars. Using the MDM 2.4m telescope we obtain upper limits in the optical at the position of the point source, (J2000) 00h07m01.56s, +73o03'08.1", determined to an accuracy of 0.1", of B>25.4, V>24.8, R>25.1, and I>23.7; these correspond to an X-ray-to-optical flux ratio >100. Neither a VLA image at 1425 MHz, nor a deep pulsar search at 820 MHz using the NRAO Green Bank Telescope, reveal a radio pulsar counterpart to an equivalent luminosity limit at 1400 MHz of 0.02 mJy kpc^2, which is equal to the lowest luminosity known for any radio pulsar. The Chandra point source accounts for about 30% of the flux of RX J0007.0+7303, while its compact nebula plus jet comprise about 70%. The X-ray spectrum of the point source is fitted with a power-law plus blackbody model with Gamma = 1.6+/-0.6, kT_{infty} = 0.13+/-0.05 keV, and R_infty = 0.37 km, values typical of a young pulsar. An upper limit of T^{infty}_e < 6.6x10^5 K to the effective temperature of the entire neutron star surface is derived, which is one of the most constraining data points on cooling models. The 0.5-10 keV luminosity of RX J0007.0+7303 is 4x10^{31}(d/1.4 kpc)^2 ergs s^{-1}, but the larger ~18' diameter synchrotron nebula in which it is embedded is two orders of magnitude more luminous. These properties allow us to estimate, albeit crudely, that the spin-down luminosity of the underlying pulsar is in the range 10^{36}-10^{37} ergs s^{-1}, and support the identification of the high-energy gamma-ray source 3EG J0010+7309 as a pulsar even though its spin parameters have not yet been determined.
description: 22 pages, 6 figures, submitted to The Astrophysical Journal
Restoring chiral symmetry to O(a^2) for dynamical Wilson fermions
Creators: name: Hoffmann, Roland
name: Della Morte, Michele
name: Knechtli, Francesco
name: Sommer, Rainer
name: Wolff, Ulli
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present results for the non-perturbative determination of the improvement and renormalization factors of the isovector axial current for lattice QCD with two flavors of dynamical Wilson quarks. The improvement and normalization conditions are formulated in terms of matrix elements of the PCAC relation in the Schroedinger functional setup and results are given in the form of interpolating formulae for bare gauge couplings beta=6/g_0^2>5.2.
description: Talk presented at Lattice 2005 (Improvement and renomalisation), 6 pages, 4 figures
title: Bayesian dynamic graphical models for high-dimensional flow forecasting in road traffic networks
Creators: name: Anacleto Junior, Osvaldo
Publisher: name: The Open University
Year: 2012

description: Congestion on roads is a crucial problem which affects our lives in many ways: As a consequence, there is a strong effort to improve road networks in order to keep the traffic flowing. Flow forecasting models based on the large amount of traffic data, which are now available, can be a very useful tool to support decisions and actions when managing traffic networks. Although many forecasting models have been developed to this end, very few of them capture important features of high dimensional traffic data and, moreover, operating most of these models is a hard task when considering on-line traffic management environments. Dynamic graphical models can be a suitable choice to address the challenge of forecasting high-dimensional traffic flows in real-time. These models represent network flows by a graph, which not only is a useful pictorial representation of multivariate time series of traffic flow data, but it also ensures that model computation is always simple, even for very complex road networks. One example of such a model is the multiregression dynamic model (MDM). This thesis focuses on the development of two classes of dynamic graphical models to forecast traffic flows . Firstly, the linear multiregression dynamic model (LMDM), which is an MDM particular case, is extended to allow important traffic characteristics in its structure, such as the heterocedasticity of daily traffic flows, measurement errors due to malfunctions in data collection devices, and the use of extra traffic variables as predictors to forecast flows. Due to its graphical structure, the MDM assumes independence of flows at the entrances of a road network. This thesis therefore introduces a new class of dynamic graphical models where the correlation across road network entrances is accommodated, resulting in better forecasts when compared to the LMDM. All the methodology proposed in this thesis is illustrated using data collected at the intersection of three busy motorways near Manchester, UK.
Optical imaging of antiferromagnetic domains in ultrathin CoO(001) films
Creators: name: Xu, Jia
name: Chen, Haoran
name: Zhou, Chao
name: Shi, Dong
name: Chen, Gong
name: Wu, Yizheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Antiferromagnetic (AFM) domains in ultrathin CoO(001) films are imaged by a wide-field optical microscopy using magneto-optical birefringence effect. The magnetic origin of observed optical contrast is confirmed by the spin orientation manipulation through exchange coupling in Fe/CoO(001) bilayer. The finite size effect of ordering temperature for ultrathin single crystal CoO film is revealed by the thickness and temperature dependent measurement of birefringence contrast. The magneto-optical birefringence effect is found to strongly depend on the photon energy of incident light, and a surprising large polarization rotation angle up to 168.5 mdeg is obtained from a 4.6 nm CoO film with a blue light source, making it possible to further investigate the evolution of AFM domains in AFM ultrathin film under external field.
description: 11 pages,5 figures
Additional file 1 of Physical activity types and risk of dementia in community-dwelling older people: the Three-City cohort
Creators: name: Dupré, Caroline
name: Bienvenu Bongue
name: Helmer, Catherine
name: Dartigues, Jean François
name: Hupin, David
name: Roche, Frédéric
name: Berr, Claudine
name: Carrière, Isabelle
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Science Policy
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1 Supplementary Table 1. Examples of activity combinations for the household/transportation activity sub-score and the leisure and sport activity sub-score.
Re-conceptualizing gaps by socioeconomic status in parental time with children
Creators: name: Vinopal, Katie
name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Differences by socioeconomic status (SES) in the total time that parents spend with their children are well documented. However, the qualitative aspects of such gaps are potentially important, yet relatively understudied. The current study analyzes time-use data for a nationally representative sample of married households with at least two children, one of whom is under 13 (N = 21,016), from the American Time Use Survey (ATUS) to provide a more nuanced analysis of previously documented differences by SES in the time parents spend with children. Specifically, two new aspects of family time are considered, both of which are distinct from other types of parent-child time and are potentially developmentally beneficial: shared time when both parents are present with a child and individual child time when no siblings are present. We find that shared time when both parents are simultaneously present with a child often comprises a substantial portion of the total gap in parental time spent with children between college-educated parents and parents who did not complete high school. Similarly, college-educated parents are found to have spent more time with children in the absence of the child’s siblings than do less-educated parents. Gaps in this time classification are often found within interactive time, which is likely especially developmentally beneficial, potentially amplifying the effects of these gaps on child development. Generally, these results suggest that SES-based gaps in parental time with children are more nuanced than previous research has recognized.
Pentaquark spectrum in string dynamics
Creators: name: Narodetskii, I. M.
name: Simonov, Yu. A.
name: Trusov, M. A.
name: Veselov, A. I.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The masses of $uudd\bar s $ and $uudd\bar d$ pentaquarks are evaluated in a framework of the Effective Hamiltonian approach to QCD using the Jaffe-Wilczek $[ud]^2\bar q$ approximation. The mass of the $[ud]^2\bar s$ state is found to be $\sim 300-500$ MeV higher than the observed $Θ^+(1540)$ mass.
description: 6 pages, 1 figure included, LaTeX2e; several references added; misprints corrected; to appear in Physics Letters B
Re-conceptualizing gaps by socioeconomic status in parental time with children
Creators: name: Vinopal, Katie
name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: Differences by socioeconomic status (SES) in the total time that parents spend with their children are well documented. However, the qualitative aspects of such gaps are potentially important, yet relatively understudied. The current study analyzes time-use data for a nationally representative sample of married households with at least two children, one of whom is under 13 (N = 21,016), from the American Time Use Survey (ATUS) to provide a more nuanced analysis of previously documented differences by SES in the time parents spend with children. Specifically, two new aspects of family time are considered, both of which are distinct from other types of parent-child time and are potentially developmentally beneficial: shared time when both parents are present with a child and individual child time when no siblings are present. We find that shared time when both parents are simultaneously present with a child often comprises a substantial portion of the total gap in parental time spent with children between college-educated parents and parents who did not complete high school. Similarly, college-educated parents are found to have spent more time with children in the absence of the child’s siblings than do less-educated parents. Gaps in this time classification are often found within interactive time, which is likely especially developmentally beneficial, potentially amplifying the effects of these gaps on child development. Generally, these results suggest that SES-based gaps in parental time with children are more nuanced than previous research has recognized.
Universal mechanical exfoliation of large-area 2D crystals
Creators: name: Huang, Yuan
name: Pan, Yu-Hao
name: Yang, Rong
name: Bao, Li-Hong
name: Meng, Lei
name: Luo, Hai-Lan
name: Cai, Yong-Qing
name: Liu, Guo-Dong
name: Zhao, Wen-Juan
name: Zhou, Zhang
name: Wu, Liang-Mei
name: Zhu, Zhi-Li
name: Huang, Ming
name: Liu, Li-Wei
name: Liu, Lei
name: Cheng, Peng
name: Wu, Ke-Hui
name: Tian, Shi-Bing
name: Gu, Chang-Zhi
name: Shi, You-Guo
name: Guo, Yan-Feng
name: Cheng, Zhi Gang
name: Hu, Jiang-Ping
name: Zhao, Lin
name: Sutter, Eli
name: Sutter, Peter
name: Wang, Ye-Liang
name: Ji, Wei
name: Zhou, Xing-Jiang
name: Gao, Hong-Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional (2D) materials provide extraordinary opportunities for exploring phenomena arising in atomically thin crystals. Beginning with the first isolation of graphene, mechanical exfoliation has been a key to provide high-quality 2D materials but despite improvements it is still limited in yield, lateral size and contamination. Here we introduce a contamination-free, one-step and universal Au-assisted mechanical exfoliation method and demonstrate its effectiveness by isolating 40 types of single-crystalline monolayers, including elemental 2D crystals, metal-dichalcogenides, magnets and superconductors. Most of them are of millimeter-size and high-quality, as shown by transfer-free measurements of electron microscopy, photo spectroscopies and electrical transport. Large suspended 2D crystals and heterojunctions were also prepared with high-yield. Enhanced adhesion between the crystals and the substrates enables such efficient exfoliation, for which we identify a common rule that underpins a universal route for producing large-area monolayers and thus supports studies of fundamental properties and potential application of 2D materials.
Should value-added models control for student absences?
Creators: name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: Whether or not value-added models should control for contemporaneous student absences is theoretically ambiguous, as such absences are only partly outside of teachers’ control. Teachers often feel strongly that value-added models should account for student attendance, and many districts’ value-added models condition on lagged student absences as a result. Using matched teacher-student administrative data from a state-wide longitudinal data system, this note investigates the practical importance of this modeling decision for value-added measures of teacher effectiveness (VAMs). This is done by comparing VAM-based rankings of teacher effectiveness generated by value-added models that either control for current absences, control for lagged absences, or exclude student absences altogether. Regardless of how between-school differences are accounted for, VAM-based rankings of teacher effectiveness are insensitive to how, and whether, student absences enter the value-added model’s conditioning set. Spearman Rank Correlations are always larger than 0.99 for both math and reading VAMs, suggesting that whether or not value-added models control for annual student absences is a relatively unimportant modeling decision. These results are consistent with recent research suggesting that simply conditioning on lagged achievement yields approximately unbiased VAMs. Moreover, these findings suggest that controlling for student absences in teacher evaluation systems’ value-added models is a relatively inexpensive way to increase teacher buy-in.
Should value-added models control for student absences?
Creators: name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Whether or not value-added models should control for contemporaneous student absences is theoretically ambiguous, as such absences are only partly outside of teachers’ control. Teachers often feel strongly that value-added models should account for student attendance, and many districts’ value-added models condition on lagged student absences as a result. Using matched teacher-student administrative data from a state-wide longitudinal data system, this note investigates the practical importance of this modeling decision for value-added measures of teacher effectiveness (VAMs). This is done by comparing VAM-based rankings of teacher effectiveness generated by value-added models that either control for current absences, control for lagged absences, or exclude student absences altogether. Regardless of how between-school differences are accounted for, VAM-based rankings of teacher effectiveness are insensitive to how, and whether, student absences enter the value-added model’s conditioning set. Spearman Rank Correlations are always larger than 0.99 for both math and reading VAMs, suggesting that whether or not value-added models control for annual student absences is a relatively unimportant modeling decision. These results are consistent with recent research suggesting that simply conditioning on lagged achievement yields approximately unbiased VAMs. Moreover, these findings suggest that controlling for student absences in teacher evaluation systems’ value-added models is a relatively inexpensive way to increase teacher buy-in.
Teachers' grade-level reassignments : Evidence from Michigan
Creators: name: Brummet, Quentin
name: Hayes, Michael S.
name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Teacher churning likely harms student achievement. However, the phenomenon of within-school grade-level teacher reassignments is understudied. The current study provides descriptive evidence on the frequency and predictors of within-school teacher grade switching using both longitudinal administrative data from Michigan and nationally-representative survey data. About 7% of self-contained classroom teachers change grades following any given school year. Inexperienced teachers are relatively more likely to switch grades and grade-level reassignments are inequitably distributed across both schools and students. For example, urban schools experience significantly higher rates of grade switching. Charter schools experience significantly less grade switching than traditional public schools.
Additional file 1 of Identification of cholesterol-assimilating actinomycetes strain and application of statistical modeling approaches for improvement of cholesterol oxidase production by Streptomyces anulatus strain NEAE-94
Creators: name: El-Naggar, Noura El-Ahmady
name: El-Shweihy, Nancy M.
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Biotechnology
subject: Ecology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Additional file 1.
On Cosmological Implication of the Trace Anomaly
Creators: name: Bisabr, Yousef
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We establish a connection between the trace anomaly and a thermal radiation in the context of the standard cosmology. This is done by solving the covariant conservation equation of the stress tensor associated with a conformally invariant quantum scalar field. The solution corresponds to a thermal radiation with a temperature which is given in terms of a cut-off time excluding the spacetime regions very close to the initial singularity. We discuss the interrelation between this result and the result obtained in a two-dimensional schwarzschild spacetime.
description: 8 pages, no figures
The sustainability of UBC Food System Collaborative Project II
Creators: name: Au, Shumann
name: Collinson, Heidi
name: Goyal, Monica
name: Kovanen, Teija
name: Nakamura, Mami
name: Rajakaruna, Anushka
name: Thomson, Kimiko
Publisher: name: The University of British Columbia
Year: 2014

description: As a working team, we determined that sustainability embodies three imperatives: environmental, economic and social. In order to effectively assess the sustainability of the UBC Food System, all three of these imperatives must be considered. In this report we attempted to present the current status of UBC in terms of sustainability with specific reference given to the AMS Food Services, Agora, and the composting system. The majority of our information was developed from the papers that were written last year as a part of the five year UBC Food System Study. Based on our definition of a sustainable food system, indicators were developed to assess the sustainability of the food system. Furthermore, we developed a research design and methodology that would aid in tackling this complicated concept of sustainability in a practical manner. A sample survey is attached that may be conducted in future years to determine present weaknesses in the food system according to consumers, and where developments can be made in order to achieve a sustainable food system at UBC. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Teachers' grade-level reassignments : Evidence from Michigan
Creators: name: Brummet, Quentin
name: Hayes, Michael S.
name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: Teacher churning likely harms student achievement. However, the phenomenon of within-school grade-level teacher reassignments is understudied. The current study provides descriptive evidence on the frequency and predictors of within-school teacher grade switching using both longitudinal administrative data from Michigan and nationally-representative survey data. About 7% of self-contained classroom teachers change grades following any given school year. Inexperienced teachers are relatively more likely to switch grades and grade-level reassignments are inequitably distributed across both schools and students. For example, urban schools experience significantly higher rates of grade switching. Charter schools experience significantly less grade switching than traditional public schools.
Hydrodynamic afterburner for the Color Glass Condensate and the parton energy loss
Creators: name: Hirano, Tetsufumi
name: Nara, Yasushi
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We take hydrodynamic initial conditions in relativistic heavy ion collisions from the Color Glass Condensate (CGC) picture through the kT factorization formula. Gluon distributions produced from the CGC are found to provide good initial conditions for the hydrodynamic simulations in Au + Au collisions at Relativistic Heavy Ion Collider (RHIC) energies. We reproduce the centrality, rapidity, and energy dependences of multiplicity within this approach. We also investigate the energy loss of high pT partons in the dense thermalized medium created from colliding two CGC's. We find that our results on the centrality dependence of nuclear modification factors for pions and back-to-back correlation for charged hadrons at midrapidity are consistent with the RHIC data up to semicentral events. Whereas, our approach in which jets are calculated from perturbative QCD 2->2 processes predicts less suppression at forward rapidity region compared to the BRAHMS data in Au+Au collisions at RHIC.
description: 15 pages, 9 figures(one figure added), some typo corrected, some references added; to be published in Nucl.Phys.A
Measures of oral somatosensory acuity in adults (Gritsyk et al., 2021)
Creators: name: Gritsyk, Olesia
name: Kabakoff, Heather
name: Li, Joanne Jingwen
name: Ayala, Samantha
name: Shiller, Douglas M.
name: McAllister, Tara
Publisher: name: ASHA journals
Year: 2021
Subjects: subject: 200404 Laboratory Phonetics and Speech Science
subject: FOS: Languages and literature
subject: 170204 Linguistic Processes (incl. Speech Production and Comprehension)
subject: FOS: Psychology

description: Purpose: Somatosensory targets and feedback are instrumental in ensuring accurate speech production. Individuals differ in their ability to access and respond to somatosensory information, but there is no established standard for measuring somatosensory acuity. The primary objective of this study was to determine which of three measures of somatosensory acuity had the strongest association with change in production accuracy in a vowel learning task, while controlling for the better studied covariate of auditory acuity.Method: Three somatosensory tasks were administered to 20 female college students: an oral stereognosis task, a bite block task with auditory masking, and a novel phonetic awareness task. Individual scores from the tasks were compared to their performance on a speech learning task in which participants were trained to produce novel Mandarin vowels with visual biofeedback.Results: Of the three tasks, only bite block adaptation with auditory masking was significantly associated with performance in the speech learning task. Participants with weaker somatosensory acuity tended to demonstrate larger increases in production accuracy over the course of training.Conclusions: The bite block adaptation task measures proprioceptive awareness rather than tactile acuity and assesses somatosensory knowledge implicitly, with limited metalinguistic demands. This small-scale study provides preliminary evidence that these characteristics may be desirable for the assessment of oral somatosensory acuity, at least in the context of vowel learning tasks. Well-normed somatosensory measures could be of clinical utility by informing diagnosis/prognosis and treatment planning.
Supplemental Material S1. Complete model output.
Supplemental Material S2. Full list of stimuli in the phonetic awareness task.
Gritsyk, O., Kabakoff, H., Li, J. J., Ayala, S., Shiller, D. M., & McAllister, T. (2021). Toward an index of oral somatosensory acuity: Comparison of three measures in adults. Perspectives of the ASHA Special Interest Groups. Advance online publication. https://doi.org/10.1044/2021_PERSP-20-00218
Harbinger
Creators: name: Sheline, Sam
name: Palmer, Chris
Publisher: name: American University
Year: 2023

description: Edgardo and Heidi Griffith are the scientists and husband-and-wife team who first realized how close Panama's national animal might be to extinction. In the early 2000s a virulent, invasive fungus called chytrid began sweeping through Central America, wiping out endemic amphibians. Entire species were lost and the world barely noticed. As the fungus marched southward, its indiscriminate crosshairs fell upon a bright orange toad in the highlands of Panama. An emblem for the entire nation, the Panama golden frog (actually a toad) finally drew the attention of the global conservation community. But it was too late. By the time David Attenborough arrived in 2007, Edgardo could only find one remnant population. Luckily he had already started breeding golden frogs and dozens of other amphibians in captivity. A decade later the fight continues. A new threat a fungus particularly deadly to salamanders looms on the horizon, and Edgardo sets out to find the country's largest and possibly rarest salamander. This film also features Elizabeth Kolbert, author of the Pulitzer Prize-winning The Sixth Extinction.
Entropy in general relativity: Kerr-AdS black hole
Creators: name: Blagojević, Milutin
name: Cvetković, Branislav
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A general Hamiltonian approach to black hole thermodynamics is used to study entropy and conserved charges for Kerr-AdS solutions in general relativity. These thermodynamic variables are first consistently defined by choosing suitable boundary conditions, and then, they are shown to satisfy the first law of black hole dynamics
description: LaTeX, 12 pages
Dynamical domain walls and spin-Peierls order in doped antiferromagnets: evidence from exact diagonalization of small clusters
Creators: name: Eder, R.
name: Ohta, Y.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The hole-doped 2D t-J model is studied by exact diagonalization on a 5 x 4 cluster which, unlike the standard tilted square clusters, can in principle accomodate an antiphase domain wall. For hole concentration 10% and J/t >= 0.5 the ground state energy/site is lower than the conventional tilted square 20-site-cluster. In the ground state two holes form a loosely bound pair pinned to an antiphase domain wall. The dynamical density correlation function shows sharp quasiparticle-like peaks, reminiscent of the `holons' in 1D chains, which suggest the existence of soliton-like, propagating domain walls. The dynamical correlation function of the bond-singlet operator has a low-energy peak structure characteristic of columnar Spin-Peierls order, the dynamical spin correlation function shows an intense and isolated `resonance peak' near (pi,pi).
description: 4 pages with 5 eps-figures
Celidodacus Hendel 1914
Creators: name: Huangfu, Ning
name: Zhu, Chaodong
name: Chen, Xiaolin
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tephritidae
Celidodacus

description: Key to species of Celidodacus Hendel (modified from Hancock, 1986).
 1. Wing with a narrow transverse band over crossvein R-M, separated from apical patch at least posterior to vein R 1+2 (Fig. 13)......... 2
Wing without a separated transverse band over crossvein R-M, crossveins R-M and DM-Cu covered by same broad band..............3
 2. Abdomen red-brown; wing with vein R 4+5 setulose only at base.................................................................  C. zambeziensis Hancock
 Abdomen black; wing with vein R 4+5 setulose to beyond crossvein R-M.......................................................  C. coloniarum (Speiser)
 3. Wing with vein R 4+5 setulose beyond crossvein R-M, having one triangular hyaline spot in cell r 1.......  C. madagascariensis Hering
 Wing with vein R 4+5 setulose at base or setulose to crossvein R-M, not having triangular hyaline spot in cell r 1................................ 4
 4. Wing with vein R 4+5 setulose only at base, having one big and broad hyaline mark in cell m (Fig. 24); female spermathecae with tube connecting two saccate structures slightly short and thick (Fig. 25).........................................................  C. obnubilus (Karsch)
 Wing with vein R 4+5 setulose to crossvein R-M, having one small and narrow hyaline mark in cell m (Fig. 7); female spermathecae with tube connecting two saccate structures somewhat slender (Fig.6)....................  C. parafenestratus Chen & Freidberg, sp. nov.
description: Published as part of Huangfu, Ning, Zhu, Chaodong & Chen, Xiaolin, 2019, A new species of Celidodacus Hendel, with notes on C. coloniarum (Speiser) and C. obnubilus (Karsch), pp. 240-246 in Zoological Systematics 44 (3) on page 245, DOI: 10.11865/zs.201919, http://zenodo.org/record/4617142
Induced color charges, effective gamma-gamma-gluon vertex in QGP. Applications to heavy-ion collisions
Creators: name: Skalozub, V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the induced color charges Q_{ind.}^3, Q_{ind.}^8 and the effective vertex gamma - gamma - gluon generated in quark-gluon plasma with the A_0 condensate because of the color parity violation at this background. To imitate the case of heavy-ion collisions, we consider the model of the plasma confined in the narrow infinite plate and derive the classical gluon potentials Phi^3, Phi^8 produced by these charges. Two applications - scattering of photons on the plasma and conversion of gluon fields in two photons radiated from the plasma - are discussed.
description: 8 pages, 1 figure
Harbinger
Creators: name: Sheline, Sam
name: Palmer, Chris
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Edgardo and Heidi Griffith are the scientists and husband-and-wife team who first realized how close Panama's national animal might be to extinction. In the early 2000s a virulent, invasive fungus called chytrid began sweeping through Central America, wiping out endemic amphibians. Entire species were lost and the world barely noticed. As the fungus marched southward, its indiscriminate crosshairs fell upon a bright orange toad in the highlands of Panama. An emblem for the entire nation, the Panama golden frog (actually a toad) finally drew the attention of the global conservation community. But it was too late. By the time David Attenborough arrived in 2007, Edgardo could only find one remnant population. Luckily he had already started breeding golden frogs and dozens of other amphibians in captivity. A decade later the fight continues. A new threat a fungus particularly deadly to salamanders looms on the horizon, and Edgardo sets out to find the country's largest and possibly rarest salamander. This film also features Elizabeth Kolbert, author of the Pulitzer Prize-winning The Sixth Extinction.
Beyond the copyright wars : creativity, copyright, fair use
Creators: name: Aufderheide, Patricia
Publisher: name: Center for Social Media, American University
Year: 2023
Subjects: classificationCode: 4701
subject: Communication and media studies

description: "While the copyrightists and copyleftists mirror each other's rhetoric, a middle way to challenge long and strong copyright exists in the movement to expand the utility of fair use." - Presentation given at UW-Madison, April 2010.
Additional file 1 of Brief episodes of rapid irregular atrial activity (micro-AF) are a risk marker for atrial fibrillation: a prospective cohort study
Creators: name: Fredriksson, Tove
name: Gudmundsdottir, Katrin Kemp
name: Frykman, Viveka
name: Friberg, Leif
name: Al-Khalili, Faris
name: Engdahl, Johan
name: Svennberg, Emma
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Developmental Biology
subject: Cancer
subject: Computational Biology

description: Additional file 1:Table S1. Settings for number of ECG findings stored by R-test 4.
Phonon impact on the coherent control of quantum states in semiconductor quantum dots
Creators: name: Grodecka, Anna
name: Jacak, Lucjan
name: Machnikowski, Pawel
name: Roszak, Katarzyna
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This chapter is devoted to the recent theoretical results on the optical quantum control over charges confined in quantum dots under influence of phonons. We show that lattice relaxation processes lead to decoherence of the confined carrier states. The theoretical approach leading to a uniform, compact description of the phonon impact on carrier dynamics, perturbative in phonon couplings but applicable to arbitrary unperturbed evolution, is described in detail. Next, some applications are presented: phonon damping of Rabi oscillations in quantum dots and phonon-induced error of a single-qubit gate for an excitonic quantum dot qubit as well as for a semiconductor quantum dot spin qubit operated via a STIRAP transfer.
description: 31 pages, 10 figures; to appear as a chapter in an edited volume
Dandelion Diagram: Aggregating Positioning and Orientation Data in the Visualization of Classroom Proxemics
Creators: name: An, Pengcheng
name: Bakker, Saskia
name: Ordanovski, Sara
name: Paffen, Chris L. E.
name: Taconis, Ruurd
name: Eggen, Berry
Publisher: name: arXiv
Year: 2020
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: In the past two years, an emerging body of HCI work has been focused on classroom proxemics - how teachers divide time and attention over students in the different regions of the classroom. Tracking and visualizing this implicit yet relevant dimension of teaching can benefit both research and teacher professionalization. Prior work has proved the value of depicting teachers' whereabouts. Yet a major opportunity remains in the design of new, synthesized visualizations that help researchers and practitioners to gain more insights in the vast tracking data. We present Dandelion Diagram, a synthesized heatmap technique that combines both teachers' positioning and orientation (heading) data, and affords richer representations in addition to whereabouts - For example, teachers' attention pattern (which directions they were attending to), and their mobility pattern (i.e., trajectories in the classroom). Utilizing various classroom data from a field study, this paper illustrates the design and utility of Dandelion Diagram.
description: To be published in CHI'20 Extended Abstracts (April 25-30, 2020), 8 pages, 4 figures
Understanding the Chandra detected X-ray emission of the knots and hot spots of powerful extragalactic jets
Creators: name: Georganopoulos, Markos
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I present here a short personal view of our understanding of the Chandra detected knots and hot spots of powerful Fanaroff Rilley (FR) II radio galaxies and quasars in the context of leptonic models. Observations of the knots and hot spots strongly suggest that the jets in these powerful sources retain their relativistic velocities at large scales, all the way to the hot spots. The emission mechanism suggested for the knots of quasars and FR II radio galaxies is external Compton (EC) off the cosmic microwave backgounrd (CMB) from a relativistic flow, while for the hotspots Upstream Compton (UC) scattering from a decelerating relativistic flow.
description: Invited review at the Vulcano meeting on 'Multifrequency Behavior of High Energy Cosmic Sources', May 2003, published in Chin. J. Astron. Astrophys. 2003, F. Giovannelli (ed.), 10 pages