bluuebunny/crossref_metadata_2025_split huggingface dataset:
Lattice Simplices with a Fixed Positive Number of Interior Lattice Points: A Nearly Optimal Volume Bound
Authors: Averkov Gennadiy , Krümpelmann Jan , Nill Benjamin 
Published: May 2018

Abstract
We give an explicit upper bound on the volume of lattice simplices with fixed positive number of interior lattice points. The bound differs from the conjectural sharp upper bound only by a linear factor in the dimension. This improves significantly upon the previously best results by Pikhurko from 2001.
Sharp Isoperimetric Inequalities for Small Volumes in Complete Noncompact Riemannian Manifolds of Bounded Geometry Involving the Scalar Curvature
Authors: Nardulli Stefano , Osorio Acevedo Luis Eduardo 
Published: May 2018

Abstract
We provide an isoperimetric comparison theorem for small volumes in an $n$-dimensional Riemannian manifold $(M^n,g)$ with $C^3$ bounded geometry in a suitable sense involving the scalar curvature function. Under $C^3$ bounds of the geometry, if the supremum of scalar curvature function $S_g&lt;n(n-1)k_0$ for some $k_0\in \mathbb{R}$, then for small volumes the isoperimetric profile of $(M^n,g)$ is less then or equal to the isoperimetric profile of the complete simply connected space form of constant sectional curvature $k_0$. This work generalizes Theorem $2$ of [12] in which the same result was proved in the case where $(M^n, g)$ is assumed to be compact. As a consequence of our result we give an asymptotic expansion in Puiseux series up to the 2nd nontrivial term of the isoperimetric profile function for small volumes, generalizing our earlier asymptotic expansion [29]. Finally, as a corollary of our isoperimetric comparison result, it is shown that for small volumes the Aubin–Cartan–Hadamard’s conjecture is true in any dimension $n$ in the special case of manifolds with $C^3$ bounded geometry, and $S_g&lt;n(n-1)k_0$. Two different intrinsic proofs of the fact that an isoperimetric region of small volume is of small diameter. The 1st under the assumption of mild bounded geometry, that is, positive injectivity radius and Ricci curvature bounded below. The 2nd assuming the existence of an upper bound of the sectional curvature, positive injectivity radius, and a lower bound of the Ricci curvature.
Equations for Some Nilpotent Varieties
Authors: Johnson Ben , Sommers Eric 
Published: May 2018

AbstractLet ${\mathcal{O}}$ be a Richardson nilpotent orbit in a simple Lie algebra $\mathfrak{g}$ of rank $n$ over $\mathbb C$, induced from a Levi subalgebra whose $s$ simple roots are orthogonal, short roots. The main result of the paper is a description of a minimal set of generators of the ideal defining $\overline{\mathcal{O}}$ in $S \mathfrak{g}^{\ast }$. In such cases, the ideal is generated by bases of either one or two copies of the representation whose highest weight is the dominant short root, along with $n-s$ fundamental invariants of $S \mathfrak{g}^{\ast }$. This extends Broer’s result for the subregular nilpotent orbit, which is the case of $s=1$. Along the way we give another proof of Broer’s result that $\overline{\mathcal{O}}$ is normal. We also prove a result relating a property of the invariants of $S \mathfrak{g}^{\ast }$ to the following question: when does a copy of the adjoint representation in $S \mathfrak{g}^{\ast }$ belong to the ideal in $S \mathfrak{g}^{\ast }$ generated by another copy of the adjoint representation together with the invariants of $S \mathfrak{g}^{\ast }$?
Deformation of Dirac Structures via L∞ Algebras
Authors: Gualtieri Marco , Matviichuk Mykola , Scott Geoffrey 
Published: May 2018

AbstractThe deformation theory of a Dirac structure is controlled by a differential graded Lie algebra that depends on the choice of an auxiliary transversal Dirac structure; if the transversal is not involutive, one obtains an $L_\infty $ algebra instead. We develop a simplified method for describing this $L_\infty $ algebra and use it to prove that the $L_\infty $ algebras corresponding to different transversals are canonically $L_\infty $–isomorphic. In some cases, this isomorphism provides a formality map, as we show in several examples including (quasi)-Poisson geometry, Dirac structures on Lie groups, and Lie bialgebras. Finally, we apply our result to a classical problem in the deformation theory of complex manifolds; we provide explicit formulas for the Kodaira–Spencer deformation complex of a fixed small deformation of a complex manifold, in terms of the deformation complex of the original manifold.
A systematic assessment of the availability and clinical drug information coverage of machine-readable clinical drug data sources for building knowledge translation products
Authors: Grandy Catherine Anne , Donnan Jennifer R , Peddle Justin T , Romme Kristen , Kim Satpyul , Gamble John-Michael 
Published: May 2018

AbstractObjectiveTo identify and describe clinical drug data sources that have the potential to serve as a repository of information for developing drug knowledge translation products.MethodsTwo reviewers independently screened citations from PubMed and Embase, websites from the web search engine Google, and references from selected journals. Publicly licensed or non-proprietary data sources containing clinical drug information accessible in a machine-readable format were eligible. Data sources were assessed for their coverage across 18 pre-specified domains and 74 elements of clinical drug information.ResultsOf the 3369 unique citations or webpages screened, 44 drug information data sources were identified. Of these, 22 data sources met the study inclusion criteria. There was a mean of 4.5 (SD = 5.19) domains covered by each source and a mean of 10.9 (SD = 18) elements covered by each source. None of the data sources covered all domains and eight elements were not addressed by any source. All of the data sources identified by the study are government or academic databases.ConclusionOur study demonstrated the availability of machine-readable clinical drug data that could help facilitate the creation of novel drug knowledge translation products. However, we identified clinical content gaps in the available non-proprietary drug information sources. Further evaluation of the quality of each data source would be necessary prior to incorporating these sources into any knowledge translation products intended for clinical use.
On the nature of long-period dwarf novae with rare and low-amplitude outbursts
Authors: Kimura Mariko , Kato Taichi , Maehara Hiroyuki , Ishioka Ryoko , Monard Berto , Nakajima Kazuhiro , Stone Geoff , Pavlenko Elena P , Antonyuk Oksana I , Pit Nikolai V , Sosnovskij Aleksei A , Katysheva Natalia , Richmond Michael , Michel Raúl , Matsumoto Katsura , Kojiguchi Naoto , Sugiura Yuki , Tei Shihei , Yamamura Kenta , Cook Lewis M , Sabo Richard , Miller Ian , Goff William , Kiyota Seiichiro , Shugarov Sergey Yu , Golysheva Polina , Vozyakova Olga , Brincat Stephen M , Itoh Hiroshi , Tordai Tamás , Littlefield Colin , Pickard Roger D , Tanabe Kenji , Kinugasa Kenzo , Honda Satoshi , Taguchi Hikaru , Hashimoto Osamu , Nogami Daisaku 
Published: May 2018

Abstract
There are several peculiar long-period dwarf-nova-like objects that show rare, low-amplitude outbursts with highly ionized emission lines; 1SWASP J162117+441254, BD Pav, and V364 Lib are among them. Some researchers even doubt whether 1SWASP J1621 and V364 Lib have the same nature as normal dwarf novae. We studied the peculiar outbursts in these three objects via our optical photometry and spectroscopy, and performed numerical modeling of their orbital variations to investigate their properties. We found that their outbursts lasted for a long interval (a few tens of days), and that slow rises in brightness were commonly observed during the early stage of their outbursts. Our analyses and numerical modeling suggest that 1SWASP J1621 has a very high inclination, close to 90°, plus a faint hot spot. Although BD Pav seems to have a slightly lower inclination (∼75°), the other properties are similar to those in 1SWASP J1621. On the other hand, V364 Lib appears to have a massive white dwarf, a hot companion star, and a low inclination (∼35°). In addition, these three objects possibly have a low transfer rate and/or large disks originating from the long orbital periods. We found that these properties of the three objects can explain their infrequent and low-amplitude outbursts within the context of the disk instability model in normal dwarf novae without a strong magnetic field. In addition, we suggest that the highly ionized emission lines in outburst are observed due to a high inclination and/or a massive white dwarf. More instances of this class of object may be unrecognized, since their unremarkable outbursts can be easily overlooked.
Measuring Mindsets and Achievement Goal Motivation: A Validation Study of Three Instruments
Authors: Cook David A. , Gas Becca L. , Artino Anthony R. 
Published: May 2018

Purpose
To evaluate the validity of scores from three instruments measuring achievement goal motivation-related constructs: a shortened version of Dweck’s Implicit Theories of Intelligence Scale (ITIS-S), measuring incremental and entity mindsets; Elliot’s Achievement Goal Questionnaire–Revised (AGQ-R), measuring mastery-approach, mastery-avoidance, performance-approach, and performance-avoidance achievement goals; and Midgley’s Patterns of Adaptive Learning Scales (PALS), measuring mastery, performance-approach, and performance-avoidance achievement goals.

Method
High school students participating in a medical simulation training activity in May 2017 completed each instrument. The authors evaluated internal structure using reliability and factor analysis and relations with other variables using the multitrait–multimethod matrix.

Results
There were 178 participants. Internal consistency reliability (Cronbach alpha) was > 0.70 for all subscores. Confirmatory factor analysis of ITIS-S scores demonstrated good model fit. Confirmatory factor analysis of AGQ-R scores demonstrated borderline fit; exploratory factor analysis suggested a three-domain model (approach, mastery-avoidance, performance-avoidance). Confirmatory factor analysis of PALS scores also demonstrated borderline fit; exploratory factor analyses suggested consistent distinction between mastery and performance goals but inconsistent distinction between performance-approach and performance-avoidance goals. Correlations among AGQ-R and PALS scores were large for mastery (r = 0.72) and moderate for performance (≥ 0.45) domains; correlations among incremental and mastery scores were moderate (≥ 0.34). Contrary to expectations, correlations between entity and performance scores were negligible. Correlations between conceptually unrelated domains were small or negligible.

Conclusions
All instrument scores had good internal consistency and generally appropriate relations with other variables, but empirically determined domain structures did not consistently match theory.
A Conceptual Model for Understanding Academic Physicians’ Performances of Identity: Findings From the University of Utah
Authors: Chow Candace J. , Byington Carrie L. , Olson Lenora M. , Ramirez Karl Paulo Garcia , Zeng Shiya , López Ana María 
Published: May 2018

Purpose
To explore how academic physicians perform social and professional identities and how their personal experiences inform professional identity formation.

Method
Semistructured interviews and observations were conducted with 25 academic physicians of diverse gender and racial/ethnic backgrounds at the University of Utah School of Medicine from 2015 to 2016. Interviews explored the domains of social identity, professional identity, and relationships with patients and colleagues. Patient interactions were observed. Interviews and observations were audio-recorded, transcribed, and analyzed using grounded theory.

Results
Three major themes emerged: Physicians’ descriptions of identity differed based on social identities, as women and racially/ethnically minoritized participants linked their gender and racial/ethnic identities, respectively, to their professional roles more than men and white, non-Latino/a participants; physicians’ descriptions of professional practice differed based on social identities, as participants who associated professional practices with personal experiences often drew from events connected to their minoritized identities; and physicians’ interactions with patients corresponded to their self-described actions.

Conclusions
Professional identity formation is an ongoing process, and the negotiation of personal experiences is integral to this process. This negotiation may be more complex for physicians with minoritized identities. Implications for medical education include providing students, trainees, and practicing physicians with intentional opportunities for reflection and instruction on connecting personal experiences and professional practice.
Value-Added Activities in Medical Education: A Multisite Survey of First- and Second-Year Medical Students’ Perceptions and Factors Influencing Their Potential Engagement
Authors: Leep Hunderfund Andrea N. , Starr Stephanie R. , Dyrbye Liselotte N. , Gonzalo Jed D. , George Paul , Miller Bonnie M. , Morgan Helen K. , Hoffman Ari , Baxley Elizabeth G. , Allen Bradley L. , Fancher Tonya L. , Mandrekar Jay , Skochelak Susan E. , Reed Darcy A. 
Published: May 2018

Purpose
To describe attitudes of first- and second-year U.S. medical students toward value-added medical education, assess their self-reported desire to participate in value-added activities, and identify potentially modifiable factors influencing their engagement.

Method
The authors conducted a cross-sectional survey of first- and second-year students at nine U.S. medical schools in 2017. Survey items measured students’ attitudes toward value-added medical education (n = 7), desire to participate in value-added activities (n = 20), and factors influencing potential engagement (n = 18).

Results
Of 2,670 students invited to participate, 1,372 (51%) responded. Seventy-six percent (1,043/1,368) moderately or strongly agreed they should make meaningful contributions to patient care. Students’ desire to participate was highest for patient care activities approximating those traditionally performed by physicians, followed by systems improvement activities and lowest for activities not typically performed by physicians. Factors increasing desire to participate included opportunities to interact with practicing physicians (1,182/1,244; 95%), patients (1,177/1,246; 95%), and residents or fellows (1,166/1,246; 94%). Factors decreasing desire to participate included making changes to the health care system (365/1,227; 30%), interacting with patients via phone or electronic communication (410/1,243; 33%), and lack of curricular time (634/1,233; 51%).

Conclusions
First- and second-year medical students agree they should add value to patient care, but their desire to participate in value-added activities varies depending on the nature of the tasks. Medical schools may be able to increase students’ desire to participate by enabling face-to-face interactions with patients, embedding students in health care teams, and providing dedicated curricular time.
Sexual Harassment in Medical Schools: The Challenge of Covert Retaliation as a Barrier to Reporting
Authors: Binder Renee , Garcia Paul , Johnson Bonnie , Fuentes-Afflick Elena 
Published: May 2018

Although Title IX, the federal law prohibiting sexual harassment in educational institutions, was enacted in 1972, sexual harassment continues to be distressingly common in medical training. In addition, many women who experience sexual harassment do not report their experiences to authorities within the medical school.
In this article, the authors review the literature on the prevalence of sexual harassment in medical schools since Title IX was enacted and on the cultural and legal changes that have occurred during that period that have affected behaviors. These changes include decreased tolerance for harassing behavior; increased legal responsibility assigned to institutions; and a significant increase in the number of female medical students, residents, and faculty. The authors then discuss persisting barriers to reporting sexual harassment, including fears of reprisals and retaliation, especially covert retaliation. They define covert retaliation as vindictive comments made by a person accused of sexual harassment about his or her accuser in a confidential setting, such as a grant review, award selection, or search committee.
The authors conclude by highlighting institutional and organizational approaches to decreasing sexual harassment and overt retaliation, and they propose other approaches to decreasing covert retaliation. These initiatives include encouraging senior faculty members to intervene and file bystander complaints when they witness inappropriate comments or behaviors as well as group reporting when multiple women are harassed by the same person.
Effects of Amplification and Hearing Aid Experience on the Contribution of Specific Frequency Bands to Loudness
Authors: Thrailkill Katie M. , Brennan Marc A. , Jesteadt Walt 
Published: May 2018

Objectives:
The primary aim of this study is to describe the effect of hearing aid amplification on the contribution of specific frequency bands to overall loudness in adult listeners with sensorineural hearing loss (SNHL). Results for listeners with SNHL were compared with results for listeners with normal hearing (NH) to evaluate whether amplification restores the normal perception of loudness for broadband sound. A secondary aim of this study is to determine whether the loudness perception of new hearing aid users becomes closer to normal over the first few months of hearing aid use. It was hypothesized that amplification would cause the high-frequency bands to contribute most to the perception of loudness and that this effect might decrease as new hearing aid users adapt to amplification.

Design:
In experiment 1, 8 adult listeners with SNHL completed a two-interval forced-choice loudness task in unaided and aided conditions. A control group of 7 listeners with NH completed the task in the unaided condition only. Stimuli were composed of seven summed noise bands whose levels were independently adjusted between presentations. During a trial, two stimuli were presented, and listeners determined the louder one. The correlation between the difference in levels for a given noise band on every trial and the listener’s response was calculated. The resulting measure is termed the perceptual weight because it provides an estimate of the relative contribution of a given frequency region to overall loudness. In experiment 2, a separate group of 6 new hearing aid users repeated identical procedures on 2 sessions separated by 12 weeks.

Results:
Results for listeners with SNHL were similar in experiments 1 and 2. In the unaided condition, perceptual weights were greatest for the low-frequency bands. In the aided condition, perceptual weights were greatest for the high-frequency bands. On average, the aided perceptual weights for listeners with SNHL for high-frequency bands were greater than the unaided weights for listeners with NH. In experiment 2, hearing aid experience did not have a significant effect on perceptual weights.

Conclusions:
The high frequencies seem to dominate loudness perception in listeners with SNHL using hearing aids as they do in listeners with NH. However, the results suggest that amplification causes high frequencies to have a larger contribution to overall loudness compared with listeners with NH. The contribution of the high frequencies to loudness did not change after an acclimatization period for the first-time hearing aid users.
Course and Contributors to Back Pain in Middle-aged Women Over 9 Years
Authors: Brady Sharmayne R.E. , Hussain Sultana Monira , Brown Wendy J. , Heritier Stephane , Wang Yuanyuan , Teede Helena , Urquhart Donna M. , Cicuttini Flavia M. 
Published: May 2018

Study Design.
Community-based, cohort study.

Objective.
Our aim was to determine the course of back pain in middle-aged women over a 9-year period, and assess whether obesity and physical inactivity are associated with more frequent back pain.

Summary of Background Data.
Back pain is the leading cause of disability worldwide. With minimal effective therapies and rising financial burden, identifying modifiable risk factors remains a key priority.

Methods.
The Australian Longitudinal Study on Women's Health is a cohort study of community-based, middle-aged women who completed questionnaires every 3 years between 2004 and 2013. Approximately, 10,530 women completed the survey in 2004 (mean age 55.5 yrs), and 9020 completed follow-up 9 years later. Self-reported data on back pain in the last 12 months and other sociodemographic factors were collected at all four surveys. ‘Frequent back pain’ was defined as back pain reported at ≥ three surveys.

Results.
Back pain was common and persistent, with 48% having back pain in ≥ three out of four surveys. Baseline obesity (relative risk [RR] 1.18, 95% confidence interval [CI] 1.12–1.25), lack of vigorous physical activity (RR 1.17, 95% CI 1.10–1.25), depressive symptoms (RR 1.40, 95% CI 1.33–1.47), and low-education status (RR 1.17, 95% CI 1.12–1.24), were independently associated with an increased risk of frequent back pain (all P < 0.001). Overall, 28% of the risk of frequent back pain could be attributed to these factors, equating to one extra case of frequent back pain for every five women with depressive symptoms, for every 11 obese women, for every 12 women with low-education status, and for every 13 women who do not do vigorous physical activity, at baseline.

Conclusion.
Obesity, depressive symptoms, low-education status, and lack of vigorous physical activity are associated with higher risk of frequent back pain over the following 9 years among women in their mid-50 s. Targeting these risk factors may lessen the burden of back pain.

Level of Evidence: 2