cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
HIGH HYDROGEN LOADING OF THIN PALLADIUM WIRES THROUGH ALKALINE EARTH CARBONATES PRECIPITATION ON THE CATHODIC SURFACE - EVIDENCE OF A NEW PHASE IN THE PD-H SYSTEM
Creators: name: F. Celani
name: A. Spallone
name: P. Marini
name: V. Di Stefano
name: M. Nakamura
name: S. Pace
name: A. Vecchione
name: A. Mancini
name: P. Tripodi
name: D. Di Gioacchino
Publisher: name: INFN Open Access Repository
Year: 2000

description: A new protocol for the electrolytic loading of hydrogen (H) in thin palladium (Pd) wires has been developed. In order to increase the cathodic overvoltage, which is known to be the main parameter capable to enhance the electrolytic H loading of Pd, the catalytic action of the Pd surface versus H-H recombination has been strongly reduced by precipitation of a thin layer of alkaline-earth carbonates on the cathode. A set of electrolytes has been employed, containing small amounts of hydrochloric or sulphuric acid and strontium or calcium ions. The H loading has been continuously evaluated through ac measurements of the Pd wire resistance. Uncommonly low resistivity values, leading to an estimate of exceptionally high H loading, have been observed. Evidence of the existence of a new phase in the very high H content region of the Pd-H system has been inferred on the basis of the determination of the temperature coefficient of the electrical resistivity. For this purpose a thin layer of Hg was galvanically deposed on the cathodic surface, in order to prevent any H deloading during the measurements. Our results have been fully reproduced in others 2 well equipped and experienced Laboratories (Italy, USA).
Description and Operation of the DAGA2_HF  Acquisition System for Gravitational Wave Detectors
Creators: name: D'Antonio, Sabrina
Publisher: name: INFN Open Access Repository
Year: 2001

description: The new acquisition system for the gravitational wave detectors of the $ROG$ group,$NAUTILUS$ in operation at the $INFN$ Laboratori Nazionali di Frascati and $EXPLORER$ at $CERN$, is described. The system, operating with a $5~kHz$ sampling rate, allows on-line data analysis for the search of impulsive excitations of the gravitational wave detectors.
title: Characteristics Associated with Increasing the Response Rates of Web-Based Surveys
Creators: name: Archer, Thomas
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Having a respectable response rate is critical to generalize the results for any survey, and web surveys present their own unique set of issues. This research identified web deployment and questionnaire characteristics that were significantly associated with increasing the response rate to web-based surveys based on a systematic evaluation of ninety-nine web-based surveys. Thirteen web deployment characteristics and nine web-based questionnaire survey characteristics were subjected to correlation and regression analysis with response rate. The resultant findings prompted recommendations: [1] Increasing the total days a questionnaire is left open, with two reminders, may significantly increase response rates. It may be wise to launch in one week, remind in the next week, and then send the final reminder in the third week; [2] Potential respondents must be convinced of the potential benefit of accessing the questionnaire; and [3] Do not be overly concerned about the length or detail of the questionnaire - getting people to the web site of the questionnaire is more important to increasing response rates. Accessed 17,461 times on https://pareonline.net from October 04, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
An Optimal Self-Stabilizing Firing Squad
Creators: name: Dolev, Danny
name: Hoch, Ezra N.
name: Moses, Yoram
Publisher: name: arXiv
Year: 2009
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Consider a fully connected network where up to $t$ processes may crash, and all processes start in an arbitrary memory state. The self-stabilizing firing squad problem consists of eventually guaranteeing simultaneous response to an external input. This is modeled by requiring that the non-crashed processes "fire" simultaneously if some correct process received an external "GO" input, and that they only fire as a response to some process receiving such an input. This paper presents FireAlg, the first self-stabilizing firing squad algorithm. The FireAlg algorithm is optimal in two respects: (a) Once the algorithm is in a safe state, it fires in response to a GO input as fast as any other algorithm does, and (b) Starting from an arbitrary state, it converges to a safe state as fast as any other algorithm does.
description: Shorter version to appear in SSS09
A New Method to Obtain a Precise Value of the Mass of the Charged Kaon
Creators: name: G. Beer
name: A.M. Bragadireanu
name: E
name: W. Breunlich
name: M. Cargnelli
name: C. Curceanu (Petrascu)
name: J.-P. Egger
name: H. Fuhrmann
name: C. Guaraldo
name: M. Giersch
name: M. Iliescu
name: T. Ishiwatari
name: K. Itahashi
name: B. Lauss
name: V. Lucherini
name: L. Ludhova
name: J. Marton
name: F. Mulhauser
name: T. Ponta
name: A.C. Sanderson
name: L.A. Schaller
name: D.L.  Sirghi
name: F. Sirghi
name: J. Zmeskal
Publisher: name: INFN Open Access Repository
Year: 2002

description: The results of a feasibility study performed by measuring, with a test setup at the collider DAFNE of Frascati, two previously unobserved transitions of kaonic nitrogen, demonstrated the possibility to make a precision measurement of the mass of the charged kaon.
כיצד מצבי רוח וחמלה עצמית משפיעים על לקיחת סיכונים?
Creators: name: Nofar Kochavi
name: Hayun, Inbar Ben
name: Biran, Shelly
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Psychology
subject: FOS: Psychology
subject: Social and Behavioral Sciences

description: זוהי הרשמה מראש למחקר שלנו, במסגרת קורס פסיכולוגיה ניסויית.
Person-Centred Crisis Support Services as Alternatives to Emergency Departments: A Scoping Review
Creators: name: Postorivo, Danielle
name: Rutherford, Zoe Hope
name: Parker, Stephen
name: Whiteford, Harvey
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences
subject: Social and Behavioral Sciences

description: Full protocol attached.
title: A data visualization and data mining approach to response and non-response analysis in survey research
Creators: name: Yu, Chong Ho
name: Jannasch-Pennell, Angel
name: DiGangi, Samuel
name: Kim, Chang
name: Andrews, Sandra
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Survey data based on self-selected samples are inherently subject to the threat of selection bias. In this study, both data visualization and data mining techniques were employed to examine whether nonresponse bias had affected a survey regarding 1:1 computing conducted at Arizona State University. Unlike conventional hypothesis testing, data visualization/EDA attends to pattern recognition instead of probabilistic inferences. In addition, unlike logistic regression, classification trees in data mining are capable of ranking independent variables in terms of their predictive power. In contrast to the findings of other studies, this study reveals that academic level, gender, and race were not identified as crucial factors in determining the response rate. Rather, the nature of the subject matter might be more important for science/engineering and law students seemed more interested in this technology-related survey. Accessed 17,302 times on https://pareonline.net from December 20, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
The impact of baryons on dark matter haloes
Creators: name: Pedrosa, Susana E.
name: Tissera, Patricia B.
name: Scannapieco, Cecilia
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse the dark matter (DM) distribution in a approx 10^12 M_sun halo extracted from a simulation consistent with the concordance cosmology, where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although the DM profiles get more concentrated as baryons are collected at the centre of the haloes compared to a pure dynamical run, the total baryonic mass alone is not enough to fully predict the reaction of the DM profile. We also note that baryons affect the DM distribution even outside the central regions. Those systems where the transformation of gas into stars is regulated by Supernova (SN) feedback, so that significant disc structures are able to form, are found to have more concentrated dark matter profiles than a galaxy which has efficiently transformed most of its baryons into stars at early times. The accretion of satellites is found to be associated with an expansion of the dark matter profiles, triggered by angular momentum transfer from the incoming satellites. As the impact of SN feedback increases, the satellites get less massive and are even strongly disrupted before getting close to the main structure causing less angular momentum transfer. Our findings suggest that the response of the DM halo is driven by the history of assembly of baryons into a galaxy along their merger tree.
description: 5 pages, 5 figures, accepted for publication in MNRAS
title: Determining the Number of Factors to Retain in EFA: An easy-to-use computer program for carrying out Parallel Analysis
Creators: name: Ledesma, Rubén Daniel
name: Valero-Mora, Pedro
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Parallel Analysis is a Monte Carlo simulation technique that aids researchers in determining the number of factors to retain in Principal Component and Exploratory Factor Analysis. This method provides a superior alternative to other techniques that are commonly used for the same purpose, such as the Scree test or the Kaiserâ€™s eigenvalue-greater-than-one rule. Nevertheless, Parallel Analysis is not well known among researchers, in part because it is not included as an analysis option in the most popular statistical packages. This paper describes and illustrates how to apply Parallel Analysis with an easy-to-use computer program called ViSta-PARAN. ViSta-PARAN is a user-friendly application that can compute and interpret Parallel Analysis. Its user interface is fully graphic and includes a dialog box to specify parameters, and specialized graphics to visualize the analysis output. Accessed 35,722 times on https://pareonline.net from February 01, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Randomized Field Trials and Internal Validity: Not So Fast My Friend
Creators: name: McMillan, James H.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: The purpose of this article is to summarize eight potential threats to internal validity that occur with randomized field trial (RFT) studies. Depending on specific contextual factors, RFTs do not necessarily result in strong internal validity. Of particular concern is whether the unit of random assignment is the same as the number of replications of the intervention, threats as a result of local history, and subject effects. The eight threats are described, with suggestions for providing adequate monitoring to know if they rise to the level of likely or plausible threat to internal validity. Accessed 19,617 times on https://pareonline.net from December 03, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Assessing Program Outcomes When Participation Is Voluntary: Getting More Out of a Static-Group Comparison
Creators: name: Szafran, Robert F.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: This paper describes a straightforward approach to assessing the effect of an educational program when individual student participation in the program is voluntary, pretests are not feasible, and the statistical expertise of program personnel or assessment audiences is limited. Background characteristics of students believed to influence the outcome of interest are selected. In order to compute a control group outcome which can be compared to the program group outcome, control group member outcomes are weighted based on the proportion of program participants with the same combination of background characteristics. In this way the outcomes of the control group are estimated had that control group the identical background characteristics as the program group. Accessed 15,053 times on https://pareonline.net from May 29, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: The Performance Effects of Word Locator Cues on the NAEP Reading Assessment
Creators: name: Everson, Howard T.
name: Osterlind, Steven J.
name: Dogan, Enis
name: Tirre, William
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Beginning with the 2009 National Assessment of Educational Progress (NAEP) reading assessment, a new subset of items will be introduced with the intent  of measuring vocabulary in context.  The assessment’s item format requires an examinee to locate a targeted word in the reading passage.  It was reasoned  that presenting these items along with ‘word locator cues’ might help reduce construct irrelevant variance due to students’ differential ability in searching the  targeted word. Using a sample of 1323 fourth and eight grade students, this study investigated the effects of two such ‘word locator cues’ on student performance: numbering the lines of the passage, and printing targeted words in boldface type. The results indicated that various format conditions (with and without cues) do not influence student performance on the vocabulary items after controlling for reading comprehension.  On the other hand, at both fourth and eighth grade, we detected interactions between format  conditions and race/ethnicity, which suggested that word locator cues appear to hurt the performance of certain subgroups. Implications of these findings for NAEP’s future reading assessments are discussed. Accessed 11,314 times on https://pareonline.net from October 04, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
Velocity Bunching in Photo-Injectors
Creators: name: L. Serafini
name: M. Ferrario
Publisher: name: INFN Open Access Repository
Year: 2000

description: We describe here a new method to increase the peak current of high brightness electron beams as those required to drive X-ray SASE FEL's, that is based on a rectilinear compressor scheme utilizing the bunching properties of slow waves.  It is shown that whenever a beam,  slower than the synchronous velocity,  is injected into a RF wave at the zero acceleration phase and slips back in phase up to the peak acceleration phase, it can be compressed as far as the extraction happens at the synchronous velocity. In fact, the bunch undergoes a quarter of synchrotron oscillation that induces a net compression (i.e. a bunch length reduction) up to a factor of 20 when proper care is taken to preserve the longitudinal emittance. A few examples are presented to demonstrate the potentialities of this method, by which multi-kA beams at very low emittance can be generated at moderate energies (about 100 MeV).
A covariate adjustment for zero-truncated approaches to estimating the size of hidden and elusive populations
Creators: name: Böhning, Dankmar
name: van der Heijden, Peter G. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: In this paper we consider the estimation of population size from one-source capture--recapture data, that is, a list in which individuals can potentially be found repeatedly and where the question is how many individuals are missed by the list. As a typical example, we provide data from a drug user study in Bangkok from 2001 where the list consists of drug users who repeatedly contact treatment institutions. Drug users with 1, 2, 3$,...$ contacts occur, but drug users with zero contacts are not present, requiring the size of this group to be estimated. Statistically, these data can be considered as stemming from a zero-truncated count distribution. We revisit an estimator for the population size suggested by Zelterman that is known to be robust under potential unobserved heterogeneity. We demonstrate that the Zelterman estimator can be viewed as a maximum likelihood estimator for a locally truncated Poisson likelihood which is equivalent to a binomial likelihood. This result allows the extension of the Zelterman estimator by means of logistic regression to include observed heterogeneity in the form of covariates. We also review an estimator proposed by Chao and explain why we are not able to obtain similar results for this estimator. The Zelterman estimator is applied in two case studies, the first a drug user study from Bangkok, the second an illegal immigrant study in the Netherlands. Our results suggest the new estimator should be used, in particular, if substantial unobserved heterogeneity is present.
description: Published in at http://dx.doi.org/10.1214/08-AOAS214 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: A Practitioner’s Guide for Variable-length Computerized Classification Testing
Creators: name: Thompson, Nathan A.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Variable-length computerized classification tests, CCTs, (Lin & Spray, 2000; Thompson, 2006) are a powerful and efficient approach to testing for the purpose of classifying examinees into groups. CCTs are designed by the specification of at least five technical components: psychometric model, calibrated item bank, starting point, item selection algorithm, and termination criterion. Several options exist for each of these CCT components, creating a myriad of possible designs. Confusion among designs is exacerbated by the lack of a standardized nomenclature. This article outlines the components of a CCT, common options for each component, and the interaction of options for different components, so that practitioners may more efficiently design CCTs. It also offers a suggestion of nomenclature. Accessed 17,852 times on https://pareonline.net from January 30, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Assessing unidimensionality: A comparison of Rasch Modeling, Parallel Analysis, and TETRAD
Creators: name: Yu, Chong Ho
name: Osborn-Popp, Sharon
name: DiGangi, Samuel
name: Jannasch-Pennell, Angel
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: The evaluation of assessment dimensionality is a necessary stage in the gathering of evidence to support the validity of interpretations based on a total score, particularly when assessment development and analysis are conducted within an item response theory (IRT) framework. In this study, we employ polytomous item responses to compare two methods that have received increased attention in recent years (Rasch model and Parallel analysis) with a method for evaluating assessment structure that is less well-known in the educational measurement community (TETRAD). The three methods were all found to be reasonably effective. Parallel Analysis successfully identified the correct number of factors and while the Rasch approach did not show the item misfit that would indicate deviation from clear unidimensionality, the pattern of residuals did seem to indicate the presence of correlated, yet distinct, factors. TETRAD successfully confirmed one dimension in the single-construct data set and was able to confirm two dimensions in the combined data set, yet excluded one item from each cluster, for no obvious reasons. The outcomes of all three approaches substantiate the conviction that the assessment of dimensionality requires a good deal of judgment. Accessed 19,548 times on https://pareonline.net from October 08, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
The Majorana Neutrinoless Double-Beta Decay Experiment
Creators: name: Guiseppe, V. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration proposes to assemble an array of HPGe detectors to search for neutrinoless double-beta decay in Ge-76. Our proposed method uses the well-established technique of searching for neutrinoless double-beta decay in high purity Ge-diode radiation detectors that play both roles of source and detector. The technique is augmented with recent improvements in signal processing and detector design, and advances in controlling intrinsic and external backgrounds. Initially, Majorana aims to construct a prototype module containing 60 kg of Ge detectors to demonstrate the potential of a future 1-tonne experiment. The design and potential reach of this prototype Demonstrator module will be presented. This paper will also discuss detector optimization and low-background requirements, such as material purity, background rejection, and identification of rare backgrounds required to reach the sensitivity goals of the Majorana experiment.
description: paper submitted to the 2008 IEEE Nuclear Science Symposium Conference Record
title: Decoding the Meaning of Factorial Invariance and Updating the Practice of Multi-group Confirmatory Factor Analysis: A Demonstration With TIMSS Data
Creators: name: Wu, Amery D.
name: Li, Zhen
name: Zumbo, Bruno D.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Measurement invariance (MI) has been developed in a very technical language and manner that is generally not widely accessible to social and behavioral researchers and applied measurement specialists. Primarily relying on the widely known concepts in regression and linear statistical modeling, this paper decoded the concept of MI in the context of factor analysis. The paper began by describing what is MI (and lack of MI) and how the concept can be realized in the context of factor analysis. Next, we explained the need for modeling the mean and covariance structure (MACS), instead of the traditionally applied covariance structure, in detecting factorial invariance. Along the way, we addressed the related matter of statistically testing for MI using the Chi-squared likelihood ratio test and fit indices in multi-group MACS confirmatory factor analysis. Bringing to bear current developments by Cheung and Rensvold (2002) and others, we provided an update on the practice of using change in fit statistics to test for MI. Throughout the paper we concretized our discussion, without lack of generality to other constructs and research settings, with an example of 21 cross-country MI comparisons of the 1999 TIMSS mathematics scores. Accessed 23,092 times on https://pareonline.net from February 11, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
Efficient LLR Calculation for Non-Binary Modulations over Fading Channels
Creators: name: Yazdani, Raman
name: Ardakani, Masoud
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Log-likelihood ratio (LLR) computation for non-binary modulations over fading channels is complicated. A measure of LLR accuracy on asymmetric binary channels is introduced to facilitate good LLR approximations for non-binary modulations. Considering piecewise linear LLR approximations, we prove convexity of optimizing the coefficients according to this measure. For the optimized approximate LLRs, we report negligible performance losses compared to true LLRs.
description: Submitted to IEEE Transactions on Communications
Individual Differences in Distractibility
Creators: name: Röer, Jan Philipp
name: Rummel, Jan
name: Anna-Lena Schubert
name: Hein, Johanna
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Within the framework of Process Overlap Theory (Kovacs & Conway, 2016), it has been suggested that the positive manifold observed across several cognitive tasks is due to domain-general executive attention processes that are closely linked to general intelligence (Kovacs & Conway, 2019). One process that might function as an executive attention process and has not yet been investigated thoroughly on an individual-differences level is distractibility. In the following study, we aim to investigate distractibility’s role in individual differences in general cognitive abilities. We plan to assess participants’ distractibility by comparing their accuracy in three recall tasks of different domains (figural, numerical, semantic) with and without distraction in the form of irrelevant speech. Individual distractibility will then be modeled as the latent change between conditions without and with irrelevant speech. These latent distractibility scores will load on one distractibility factor which will then be correlated with participants’ general cognitive abilities.
מחקר במסגרת קורס פסיכולוגיה ניסויית
Creators: name: Shalom, Noa
name: Israel, Adi Ben
name: Harosh, Ron Ben
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: השפעת עומס הפידבק החיובי, על רמת מוטיבציה פנימית שתתעורר בנבדקים בעלי סגנון ייחוס פנימית לעומת חיצוני
ניסויית-הרשמה מראש
Creators: name: מולאי נגה
name: Biran, Hilla
name: Brikman, Yael
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: ,זוהי הרשמה מראש למחקר שלנו על השפעת היציבות הכלכלית במשק והעצמאות הכלכלית של עובד על רמת הסיפוק מעבודה שלו במסגרת קורס פסיכולוגיה ניסויית
Investigation of bond in 3/8 inch diameter strand for pretensioned concrete members
Creators: name: Suryaprakasam, Kunapuli
Publisher: name: University of British Columbia
Year: 2011

description: A direct method which was useful for repeated quick tests was presented to determine the bond anchorage length for 3/8 inch diameter strand and the distribution of bond forces within the anchorage length. Seventy-four specimens were tested. Three different cross sections were tried, namely 4 in. x 4 in., 3 in. x 3 in. and 2 in. x 2 in. Two types of load conditions were tested, tensioned and untensioned. From the experimental results it was observed that friction appears to be the major component determining the bond strength. The bond strength of strand does not appear to be significantly affected by the degree of initial steel stress in concrete. The anchorage length for 3/8 inch diameter rusted strand was found to be between 8 and 10 inches for a force of 13 to 14 kips.
title: Opportunities for underground geological storage of CO2 in New Zealand : report CCS-08/7, onshore Taranaki Neogene reservoirs
Creators: name: Strogen, Dominic P.
name: Arnot, Malcolm J.
name: Bland, Kyle J.
name: Griffin, Angela G.
Publisher: name: GNS Science
publisherIdentifier: https://ror.org/03vaqfv64
publisherIdentifierScheme: ROR
Year: 2009

description: A systematic review of potential clastic Neogene reservoir systems for the geological storage of CO2 beneath the Taranaki Peninsula is presented herein. Reservoirs discussed in this report are the Mid Miocene Moki and Otunui formations, the Late Miocene Mount Messenger, Urenui and Kiore formations and the Late Miocene-Early Pliocene Matemateaonga Formation. Details on the depositional environment, lateral continuity of reservoir and intraformational seal/baffle units, net:gross, thickness and reservoir quality are contained within the main report. (auth/DG)
Cataclysmic Variable Primary Effective Temperatures: Constraints on Binary Angular Momentum Loss
Creators: name: Townsley, Dean M.
name: Gaensicke, Boris T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We review the most decisive currently available measurements of the surface effective temperatures, Teff, of white dwarf (WD) primaries in cataclysmic variables (CVs) during accretion quiescence, and use these as a diagnostic for their time averaged accretion rate, . Using time-dependent calculations of the WD envelope, we investigate the sensitivity of the quiescent Teff to long term variations in the accretion rate. We find that the quiescent Teff provides one of the best available tests of predictions for the angular momentum loss and resultant mass transfer rates which govern the evolution of CVs. While gravitational radiation is sufficient to explain the of strongly magnetic CVs at all Porb, faster angular momentum loss is required by the temperatures of dwarf nova primaries (non-magnetic systems). This provides evidence that a normal stellar magnetic field structure near the secondary is essential for the enhanced braking mechanism to work, supporting the well-known stellar wind braking hypothesis. The contrast in is most prominent for orbital periods Porb > 3 hours, above the period gap, but a modest enhancement is also present at shorter Porb. The averaging time which reflects is as much as 10^5 years for low- systems and as little as 10^3 years for high- systems. We discuss the security of conclusions drawn about the CV population in light of these time scales and our necessarily incomplete sample of systems. Measurements for non-magnetic systems above the period gap fall below predictions from traditional stellar wind braking prescriptions, but above more recent predictions with somewhat weaker angular momentum loss. We also discuss the apparently high Teff's found in the VY Scl stars. (abridged)
description: 17 pages, 6 figures, accepted to the Astrophysical Journal
title: An Introduction To Multi-Battery Factor Analysis: Overcoming Method Artefacts
Creators: name: Brown, Gavin T. L.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Examination of participant's responses to factor or scale scores provides useful insights, but analysis of such scores from multiple measures or batteries is sometimes confounded by methodological artefacts. This paper provides a short primer into the use of multi-trait, multi-method (MTMM) correlational analysis and multi-battery factor analysis (MBFA). The principles of both procedures are outlined and a case study is provided from the author's research into 233 teacher's responses to 22 scale scores drawn from five batteries. The batteries were independently developed measures of teacher's thinking about the nature and purpose of assessment, teaching, learning, curriculum, and teacher efficacy. Detailed procedures for using Cudeck's (1982) MBFACT software are provided. Both MTMM and MBFA analyses identified an appropriate common trait across the five batteries, whereas joint factor analysis of the 22 scale scores confounded the common trait with a battery or method artefact. When researchers make use of multiple measures, they ought to take into account the impact of method artefacts when analyzing scale scores from multiple batteries. The multi-battery factor analysis procedure and MBFACT software provide a robust procedure for exploring how scales inter-relate. Accessed 16,966 times on https://pareonline.net from May 29, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
Ultra-luminous Infrared Galaxies in Sloan Digital Sky Survey Data Release 6
Creators: name: Hou, L. G.
name: Wu, Xue-Bing
name: Han, J. L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Ultra-luminous infrared galaxies (ULIRGs) are interesting objects with dramatic properties. Many efforts have been made to understand the physics of their luminous infrared emission and evolutionary stages. However, a large ULIRG sample is still needed to study the properties of their central black holes (BHs), the BH-host galaxy relation, and their evolution. We identified 308 ULIRGs from the Sloan Digital Sky Survey Data Release 6, and classified them into the NL ULIRGs (with only narrow emission lines) and the Type I ULIRGs (with broad emission lines). About 56% of ULIRGs in our total sample show interaction features, and this percentage is 79% for redshift z < 0.2. Optical identifications of these ULIRGs show that the AGN percentage is at least 49%, and the percentage increases with the infrared luminosity. We found 62 Type I ULIRGs, and estimated their BH masses and velocity dispersions from their optical spectra. Together with known Type I ULIRGs in the literature, a sample of 90 Type I ULIRGs enables us to make a statistical study. We found that the BH masses of Type I ULIRGs are typically smaller than those of PG QSOs, and most Type I ULIRGs follow the M_{BH}-sigma relation. However, some ULIRGs with larger Eddington ratio deviate from this relation, even the line width of the [OIII] narrow line (NL) core or the [SII] line was used as the surrogate of velocity dispersion. This implies that at least some ULIRGs are probably still in the early evolution stage toward QSOs. The anti-correlation between the mass deviation from the M_{BH}-sigma relation and the Eddington ratio supports that the evolution of Type I ULIRGs is probably followed by the building up of the M_{BH}-sigma relation and the evolution to the QSO phase.
description: 46 pages, 15 figures, 2 tables; published by ApJ
title: An Investigation of Item Type in a Standards-Based Assessment
Creators: name: Hollingworth, Liz
name: Beard, Jonathan J.
name: Proctor, Thomas P.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Large-scale state assessment programs use both multiple-choice and open-ended items on tests for accountability purposes. Certainly, there is an intuitive belief among some educators and policy makers that open-ended items measure something different than multiple-choice items. This study examined two item formats in custom-built, standards-based tests of achievement in Reading and Mathematics at grades 3-8. In this paper, we raise questions about the value of including open-ended items, given scoring costs, time constraints, and the higher probability of missing data from test-takers. Accessed 19,320 times on https://pareonline.net from December 10, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
Terahertz lasers based on optically pumped multiple graphene structures with slot-line and dielectric waveguides
Creators: name: Ryzhii, V.
name: Dubinov, A. A.
name: Otsuji, T.
name: Mitin, V.
name: Shur, M. S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Terahertz (THz) lasers on optically pumped multiple-graphene-layer (MGL) structures as their active region are proposed and evaluated. The developed device model accounts for the interband and intraband transitions in the degenerate electron-hole plasma generated by optical radiation in the MGL structure and the losses in the slot or dielectric waveguide. The THz laser gain and the conditions of THz lasing are found. It is shown that the lasers under consideration can operate at frequencies > 1 THz at room temperatures.
description: 7 pages, 10 figures
Additional file 8 of Identification of ferroptosis related biomarkers and immune infiltration in Parkinson’s disease by integrated bioinformatic analysis
Creators: name: Xing, Na
name: Dong, Ziye
name: Wu, Qiaoli
name: Zhang, Yufeng
name: Kan, Pengcheng
name: Han, Yuan
name: Cheng, Xiuli
name: Wang, Yaru
name: Zhang, Biao
Publisher: name: figshare
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified

description: Supplementary Material 8
title: Using NAEP to Confirm State Test Results in the No Child Left Behind Act
Creators: name: Stoneberg, Bert D.
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: The U.S. Department of Education has not yet published an official guidance document for using NAEP achievement level scores to confirm state testing results. A review of the literature, however, identified four principles that inform the valid use of NAEP scores in a confirming analysis. These principles address the appropriate NAEP statistic to use to confirm state testing results, the difference between NAEP and state definitions of “proficiency,” a rationale for avoiding point-bypoint comparisons, and a rationale for using trend analysis.   Accessed 26,868 times on https://pareonline.net from May 25, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
Effect of shear and transverse compression on deflection of beams in elastic range
Creators: name: Dhanju, Kulwant Singh
Publisher: name: University of British Columbia
Year: 2011

description: This thesis presents a refinement of the conventional theory of sheer deflection of beams in the elastic range. The author's theory allows for discontinuity of sheer distortions of sections in the vicinity of vertical loads and also for the effect of vertical compression of the beam at the point of application of the vertical load. The writer does not investigate normal and shearing stresses but deals only with the effects considered as they influence deflection. The theory was tested experimentally on an aluminum alloy I-beam and a rectangular steel beam. The beam was rested on three supports and the load was applied at two points symmetrical to the central support, producing a statically indeterminate condition. Due to smallness of sheer deflections, the comparison between the theories was made in terms of statically unknown reactions rather than deflections themselves. These reactions were calculated from strains determined experimentally. The reactions computed in conformity with the two theories were then compared with the ones found from the electric strain gage readings. Attempt was made to find experimentally the effect of the proximity of the load on the strain gage readings.
Natalye Appel Guest Lecture
Creators: name: Appel, Natalye
Publisher: name: The University of Texas at Austin
Year: 0
Subjects: Houston (Tex.)
Architectural practice
Vernacular architecture
Architecture--Mexican influences
Natalye Appel + Associates
Architecture--Aesthetics
Light in architecture
Mixed-use developments
Nature (Aesthetics)
Val Glitsch Architects
barrel vaults
trusses (structural elements)
Concrete masonry

description: Architectural projects and/or sites mentioned: Caldwell Beach House (Natalye Appel + Associates, 1990) (Galveston, Texas) ; Balinskas House (Natalye Appel + Associates, 1992) (Houston, Texas) ; Lightman House/Looking at Art (Natalye Appel + Associates, 1994) (Houston, Texas) ; Unitarian Fellowship of Houston (Natalye Appel + Associates, 1995) (Houston, Texas) ; Haskell Street Townhouses (Natalye Appel + Associates, 1995) (Houston, Texas) ; Bavousett House (Natalye Appel + Associates, 1994) (Houston, Texas) ; Susman Bay House (Natalye Appel + Associates, 1994) (Pirate's Cove, Texas)
description: Audio files are EID restricted. Individuals without an EID should send an email request to apl-aaa@lib.utexas.edu.
Partial monoids: associativity and confluence
Creators: name: Poinsot, Laurent
name: Duchamp, Gérard
name: Tollu, Christophe
Publisher: name: arXiv
Year: 2010
Subjects: subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: A partial monoid $P$ is a set with a partial multiplication $\times$ (and total identity $1_P$) which satisfies some associativity axiom. The partial monoid $P$ may be embedded in a free monoid $P^*$ and the product $\star$ is simulated by a string rewriting system on $P^*$ that consists in evaluating the concatenation of two letters as a product in $P$, when it is defined, and a letter $1_P$ as the empty word $ε$. In this paper we study the profound relations between confluence for such a system and associativity of the multiplication. Moreover we develop a reduction strategy to ensure confluence and which allows us to define a multiplication on normal forms associative up to a given congruence of $P^*$. Finally we show that this operation is associative if, and only if, the rewriting system under consideration is confluent.
title: On the Performance of the lZ Person-Fit Statistic
Creators: name: Armstrong, Ronald D.
name: Stoumbos, Zachary G.
name: T., Kung Mabel
name: Shi, Min
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: Person-fit measurement refers to statistical methods used to detect improbable item-score patterns. This study.investigates the detection effectiveness of the lz statistic, which is one of the most popular and powerful person-fit statistics in the literature to date. The contributions of the present study are three-fold. First, the simulation results show that the detection power of the lz statistic is largely hinged on test characteristics, particularly the test difficulty. Therefore, the lz statistic should be used with caution in an operational testing environment. Second, this paper provides a clear explanation for the poor performance of the lz statistic under certain situations. The third objective is to present a summary of the patterns and conditions for which the lz statistic is not recommended for the detection of aberrancy. This can be used as a checklist for implementation purposes. Accessed 41,380 times on https://pareonline.net from December 05, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Facilitating Greater Test Success for English Language Learners
Creators: name: Fairbairn, Shelley
Publisher: name: University of Massachusetts Amherst
Year: 2007

description: In an age of test-based accountability, accurate assessment is paramount. When testing English language learners (ELLs), challenges associated with language, the use of test accommodations, and test/item format can undermine this accuracy. This paper describes these challenges and offers strategies for overcoming them in order to more accurately assess what ELLs know and can do. Accessed 18,948 times on https://pareonline.net from September 28, 2007 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Practical Considerations for Using Exploratory Factor Analysis in Educational Research
Creators: name: Beavers, Amy S.
name: Lounsbury, John W.
name: Richards, Jennifer K.
name: Huck, Schuyler W.
name: Skolits, Gary J.
name: Esquivel, Shelley L.
Publisher: name: University of Massachusetts Amherst
Year: 2013

description: The uses and methodology of factor analysis are widely debated and discussed, especially the issues of rotational use, methods of confirmatory factor analysis, and adequate sample size. The variety of perspectives and often conflicting opinions can lead to confusion among researchers about best practices for using factor analysis. The focus of the present review is to clarify terminology, identify key issues, and clarify areas of debate regarding best practices and functions of factor analytic procedures., The conclusions and implications drawn should be useful to researchers in education, psychology, and cognate social fields who employ factor analytic procedures or evaluate research using factor analytic methods. Accessed 27,993 times on https://pareonline.net from March 05, 2013 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Validity Semantics in Educational and Psychological Assessment
Creators: name: Hathcoat, John D.
Publisher: name: University of Massachusetts Amherst
Year: 2013

description: The semantics, or meaning, of validity is a fluid concept in educational and psychological testing. Contemporary controversies surrounding this concept appear to stem from the proper location of validity. Under one view, validity is a property of score-based inferences and entailed uses of test scores. This view is challenged by the instrument-based approach, which contends that tests themselves are either valid or invalid. These perspectives are contrasted by their ontological and epistemological emphases, as well as their breadth of validation focus. Ontologically, these positions diverge in their alliance with psychometric realism, or the position that attributes characterizing the aim of psychological and educational measurement exist in the actual world and that claims about their existence can be justified. Epistemologically, these positions deviate in the function of truth when accepting validity claims and inform distinct lines of inquiry in the validation process. Finally, validity under the instrument-based approach is restricted to a single proposition -namely, that observed score variation is caused by an underlying attribute. Though seemingly arbitrary, these distinct validity semantics may have a range of implications on assessment practices. Accessed 8,561 times on https://pareonline.net from June 25, 2013 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.
title: Normality of residuals is a continuous variable, and does seem to influence the trustworthiness of confidence intervals : A response to, and appreciation of, Williams, Grajales, and Kurkiewicz (2013)
Creators: name: Osborne, Jason W.
Publisher: name: University of Massachusetts Amherst
Year: 2013

description: Osborne and Waters (2002) focused on checking some of the assumptions of multiple linear regression. In a critique of that paper, Williams, Grajales, and Kurkiewicz correctly clarify that regression models estimated using ordinary least squares require the assumption of normally distributed errors, but not the assumption of normally distributed response or predictor variables.They go on to discuss estimate bias and provide a helpful summary of the assumptions of multiple.regression when using ordinary least squares. While we were not as precise as we could have been when discussing assumptions of normality, the critical issue of the 2002 paper remains -researchers often do not check on or report on the assumptions of their statistical methods. This response expands on the points made by Williams, advocates a thorough examination of data prior to reporting results, and provides an example of how incremental improvements in meeting the assumption of normality of residuals incrementally improves the accuracy of confidence intervals. Accessed 6,654 times on https://pareonline.net from September 06, 2013 to December 31, 2019. For downloads from January 1, 2020 forward, please click on the PlumX Metrics link to the right.