bluuebunny/crossref_metadata_2025_split huggingface dataset:
Magnetically driven jets and winds from weakly magnetized accretion discs
Authors: Jacquemin-Ide J , Ferreira J , Lesur G 
Published: October 2019

Abstract
Semi-analytical models of disc outflows have successfully described magnetically driven, self-confined super-Alfvénic jets from near-Keplerian accretion discs. These jet-emitting discs (JEDs) are possible for high levels of disc magnetization μ defined as μ = 2/β, where beta is the usual plasma parameter. In near-equipartition JEDs, accretion is supersonic and jets carry away most of the disc angular momentum. However, these solutions prove difficult to compare with cutting-edge numerical simulations, for the reason that numerical simulations show wind-like outflows but in the domain of small magnetization. In this work, we present for the first time self-similar isothermal solutions for accretion–ejection structures at small magnetization levels. We elucidate the role of magnetorotational instability-like (MRI) structures in the acceleration processes that drive this new class of solutions. The disc magnetization μ is the main control parameter: Massive outflows driven by the pressure of the toroidal magnetic field are obtained up to μ ∼ 10−2, while more tenuous centrifugally driven outflows are obtained at larger μ values. The generalized parameter space and the astrophysical consequences are discussed. We believe that these new solutions could be a stepping stone in understanding the way astrophysical discs drive either winds or jets. Defining jets as self-confined outflows and winds as uncollimated outflows, we propose a simple analytical criterion based on the initial energy content of the outflow, to discriminate jets from winds. We show that jet solution is achieved at all magnetization levels, while winds could be obtained only in weakly magnetized discs that feature heating.
Towards the analysis of JWST exoplanet spectra: the effective temperature in the context of direct imaging
Authors: Baudino Jean-Loup , Taylor J , Irwin P G J , Garland R 
Published: October 2019

ABSTRACT
The current sparse wavelength range coverage of exoplanet direct imaging observations, and the fact that models are defined using a finite wavelength range, lead both to uncertainties on effective temperature determination. We study these effects using blackbodies and atmospheric models and we detail how to infer this parameter. Through highlighting the key wavelength coverage that allows for a more accurate representation of the effective temperature, our analysis can be used to mitigate or manage extra uncertainties being added in the analysis from the models. We find that the wavelength range coverage will soon no longer be a problem. An effective temperature computed by integrating the spectroscopic observations of the James Webb Space Telescope will give uncertainties similar to, or better than, the current state–of–the–art, which is to fit models to data. Accurately calculating the effective temperature will help to improve current modelling approaches. Obtaining an independent and precise estimation of this crucial parameter will help the benchmarking process to identify the best practice to model exoplanet atmospheres.
The tidal evolution of dark matter substructure – I. subhalo density profiles
Authors: Green Sheridan B , van den Bosch Frank C 
Published: October 2019

ABSTRACT
Accurately predicting the abundance and structural evolution of dark matter subhaloes is crucial for understanding galaxy formation, modelling galaxy clustering, and constraining the nature of dark matter. Due to the non-linear nature of subhalo evolution, cosmological N-body simulations remain its primary method of investigation. However, it has recently been demonstrated that such simulations are still heavily impacted by artificial disruption, diminishing the information content on small scales, and reducing the reliability of all simulation-calibrated semi-analytical models. In this paper, we utilize the recently released DASH library of high-resolution, idealized simulations of the tidal evolution of subhaloes, which are unhindered by numerical overmerging due to discreteness noise or force softening, to calibrate an improved, more accurate model of the evolution of the density profiles of subhaloes that undergo tidal heating and stripping within their host halo. By testing previous findings that the structural evolution of a tidally truncated subhalo depends solely on the fraction of mass stripped, independent of the details of the stripping, we identify an additional dependence on the initial subhalo concentration. We provide significantly improved fitting functions for the subhalo density profiles and structural parameters (Vmax and rmax) that are unimpeded by numerical systematics and applicable to a wide range of parameter space. This model will be an integral component of a future semi-analytical treatment of substructure evolution, which can be used to predict key quantities, such as the evolved subhalo mass function and annihilation boost factors, and validate such calculations performed with cosmological simulations.
The rate of planet–star coalescences due to tides and stellar evolution
Authors: Popkov Alexander V , Popov Sergei B 
Published: October 2019

ABSTRACT
Orbits of close-in planets can shrink significantly due to dissipation of tidal energy in a host star. This process can result in star–planet coalescence within the Galactic lifetime. In some cases, such events can be accompanied by an optical or/and UV/X-ray transient. Potentially, these outbursts can be observed in near future with new facilities such as LSST from distances about few Mpc. We use a population synthesis model to study this process and derive the rate of star–planet mergers of different types. Mostly, planets are absorbed by red giants. However, these events, happening with the rate about 3 per year, mostly do not produce detectable transients. The rate of mergers with main sequence stars depends on the effectiveness of tidal dissipation; for reasonable values of stellar tidal quality factor, such events happen in a Milky Way-like galaxy approximately once in 70 yr or more rarely. This rate is dominated by planets with low masses. Such events do not produce bright transients having maximum luminosities ≲ 1036.5 erg s−1. Brighter events, related to massive planets, with maximum luminosity ∼1037.5–1038 erg s−1, have the rate nearly five times smaller.
Extensions to the halo occupation distribution model for more accurate clustering predictions
Authors: Jiménez Esteban , Contreras Sergio , Padilla Nelson , Zehavi Idit , Baugh Carlton M , Gonzalez-Perez Violeta 
Published: October 2019

ABSTRACT
We test different implementations of the halo occupation distribution (HOD) model to reconstruct the spatial distribution of galaxies as predicted by a version of the L-GALAXIES semi-analytical model (SAM). We compare the measured two-point correlation functions of the HOD mock catalogues and the SAM samples to quantify the fidelity of the reconstruction. We use fixed number density galaxy samples selected according to stellar mass or star formation rate (SFR). We develop three different schemes to populate haloes with galaxies with increasing complexity, considering the scatter of the satellite HOD as an additional parameter in the modelling. We modify the SAM output, removing assembly bias and using a standard Navarro–Frenk–White density profile for the satellite galaxies as the target to reproduce with our HOD mocks. We find that all models give similar reproductions of the two-halo contribution to the clustering signal, but there are differences in the one-halo term. In particular, the HOD mock reproductions work equally well using either the HOD of central and satellites separately or using a model that also accounts for whether or not the haloes contain a central galaxy. We find that the HOD scatter does not have an important impact on the clustering predictions for stellar mass-selected samples. For SFR selections, we obtain the most accurate results assuming a negative binomial distribution for the number of satellites in a halo. The scatter in the satellites HOD is a key consideration for HOD mock catalogues that mimic ELG or SFR-selected samples in future galaxy surveys.
Dissecting the Compton scattering kernel I: Isotropic media
Authors: Sarkar Abir , Chluba Jens , Lee Elizabeth 
Published: October 2019

ABSTRACTCompton scattering between electrons and photons plays a crucial role in astrophysical plasmas. Many important aspects of this process can be captured by using the so-called Compton scattering kernel. For isotropic media, exact analytic expressions (valid at all electron and photon energies) do exist but are hampered by numerical issues and often are presented in complicated ways. In this paper, we summarize, simplify, and improve existing analytic expressions for the Compton scattering kernel, with an eye on clarity and physical understanding. We provide a detailed overview of important properties of the kernel covering a wide range of energies and highlighting aspects that have not been appreciated as much previously. We discuss analytic expressions for the moments of the kernel, comparing various approximations and demonstrating their precision. We also illustrate the properties of the scattering kernel for thermal electrons at various temperatures and photon energies, introducing new analytic approximations valid to high temperatures. The obtained improved formulae for the kernel and its moments should prove useful in many astrophysical computations, one of them being the evolution of spectral distortions of the cosmic microwave background in the early Universe. A novel code, cspack, for efficient computations of the Compton scattering kernel and its properties (in the future also including anisotropies in the initial electron and photon distributions) is being developed in a series of papers and will be available within one month.
QTLbase: an integrative resource for quantitative trait loci across multiple human molecular phenotypes
Authors: Zheng Zhanye , Huang Dandan , Wang Jianhua , Zhao Ke , Zhou Yao , Guo Zhenyang , Zhai Sinan , Xu Hang , Cui Hui , Yao Hongcheng , Wang Zhao , Yi Xianfu , Zhang Shijie , Sham Pak Chung , Li Mulin Jun 
Published: October 2019

Abstract
Recent advances in genome sequencing and functional genomic profiling have promoted many large-scale quantitative trait locus (QTL) studies, which connect genotypes with tissue/cell type-specific cellular functions from transcriptional to post-translational level. However, no comprehensive resource can perform QTL lookup across multiple molecular phenotypes and investigate the potential cascade effect of functional variants. We developed a versatile resource, named QTLbase, for interpreting the possible molecular functions of genetic variants, as well as their tissue/cell-type specificity. Overall, QTLbase has five key functions: (i) curating and compiling genome-wide QTL summary statistics for 13 human molecular traits from 233 independent studies; (ii) mapping QTL-relevant tissue/cell types to 78 unified terms according to a standard anatomogram; (iii) normalizing variant and trait information uniformly, yielding &gt;170 million significant QTLs; (iv) providing a rich web client that enables phenome- and tissue-wise visualization; and (v) integrating the most comprehensive genomic features and functional predictions to annotate the potential QTL mechanisms. QTLbase provides a one-stop shop for QTL retrieval and comparison across multiple tissues and multiple layers of molecular complexity, and will greatly help researchers interrogate the biological mechanism of causal variants and guide the direction of functional validation. QTLbase is freely available at http://mulinlab.org/qtlbase.
Epidemiology and Socioeconomic Trends in Adult Spinal Deformity Care
Authors: Safaee Michael M , Ames Christopher P , Smith Justin S 
Published: October 2019

Abstract
Adult spinal deformity (ASD) has gained significant attention over the past decade with improvements in diagnostic tools, classification schemes, and surgical technique. The demographics of the aging population in the United States are undergoing a fundamental shift as medical care advances and life expectancy increases. The “baby boomers” represent the fastest growing demographic in the United States and by 2050, the number of individuals 65 yr and older is projected to reach 89 million, more than double its current size. Based on current prevalence estimates there are approximately 27.5 million elderly individuals with some form of spinal deformity, which will place a significant burden on our health care systems. Rates of surgery for ASD and case complexity are both increasing, with concomitant increase in the cost of deformity care. At the same time, patients are more medically complex with increasing number of comorbidities that result in increased surgical risk and complication profiles. This review aims to highlight recent trends in the epidemiology and socioeconomic patterns in surgery for ASD.
Local and Systemic Analgesic Effects of Nerve-Specific Acupuncture in Healthy Adults, Measured by Quantitative Sensory Testing
Authors: Dimitrova Alexandra , Colgan Dana Dharmakaya , Oken Barry 
Published: October 2019

Abstract

Objective
This study aims to assess whether acupuncture analgesia’s effects are local or systemic and whether there is a dose response for these effects.

Methods
Twenty-eight healthy volunteers aged 18–45 were randomized to two doses of acupuncture using points closely associated with peripheral nerves in the legs. The lower-dose group involved acupoints overlying the deep peroneal nerve (DP), and the higher-dose involved acupoints overlying the deep peroneal and posterior tibial nerves (DPTN). Baseline and acupuncture quantitative sensory testing (QST) assessments were obtained locally in the calf and great toe and systemically in the hand. Results were analyzed using factorial repeated-measures analysis of variance for each of the QST variables—cold detection threshold (CDT), vibration detection threshold (VDT), heat pain threshold (HP0.5), and heat pain perception of 5/10 (HP5.0). Location (leg/hand) and time (baseline/acupuncture) were within-subject factors. Intervention (DP/DPTN) was a between-subject factor.

Results
CDT was increased in the calf (P &lt; 0.001) and in the hand (P &lt; 0.001). VDT was increased in the toe (P &lt; 0.001) but not in the hand. HP0.5 was increased in the calf (P &lt; 0.001) and in the hand (P &lt; 0.001). HP5.0 was increased in the calf (P = 0.002) and in the hand (P &lt; 0.001), with the local effect being significantly greater than the systemic (P = 0.004). In all of the above QST modalities, there was no difference between the low-dose (DP) and high-dose (DPTN) acupuncture groups.

Conclusions
Acupuncture caused comparable local and systemic analgesic effects in cold detection and heat pain perception and only local effects in vibration perception. There was no clear acupuncture dose response to these effects.
Effects of Biopsychosocial Education on the Clinical Judgments of Medical Students and GP Trainees Regarding Future Risk of Disability in Chronic Lower Back Pain: A Randomized Control Trial
Authors: Dwyer Christopher P , MacNeela Pádraig , Durand Hannah , O’Connor Laura L , Main Chris J , McKenna-Plumley Phoebe E , Hamm Robert M , Reynolds Bronagh , Conneely Sinéad , Slattery Brian W , Taheny Darragh , NicGabhainn Saoirse , Murphy Andrew W , Kropmans Thomas , McGuire Brian E 
Published: October 2019

AbstractBackgroundChronic lower back pain (CLBP) is a major health care burden and often results in workplace absenteeism. It is a priority for appropriate management of CLBP to get individuals back to work as early as possible. Interventions informed by the flags approach, which integrates cognitive and behavioral approaches via identification of biopsychosocial barriers to recovery, have resulted in reduced pain-related work absences and increased return to work for individuals with CLBP. However, research indicates that physicians’ adherence to biopsychosocial guidelines is low.ObjectiveThe current study examined the effects of a flags approach–based educational intervention on clinical judgments of medical students and general practitioner (GP) trainees regarding the risk of future disability of CLBP patients.DesignRandomized controlled trial (trial registration number: ISRCTN53670726).SettingUniversity classroom.SubjectsMedical students and GP trainees.MethodsUsing 40 fictional CLBP cases, differences in clinical judgment accuracy, weighting, and speed (experimental N = 32) were examined pre- and postintervention, as were flags approach knowledge, pain attitudes and beliefs, and empathy, in comparison with a no-intervention control group (control N = 31).ResultsResults revealed positive effects of the educational intervention on flags approach knowledge, pain-related attitudes and beliefs, and judgment weighting of psychologically based cues; results are discussed in light of existing theory and research.ConclusionsShort flags approach–based educational video interventions on clinical judgment-making regarding the risk of future disability of CLBP patients may provide opportunities to gain biopsychosocial knowledge, overcome associated attitude barriers, and facilitate development of clinical judgment-making more aligned with psychological cues.
Motivations to Pursue Physical Therapy Residency Training: A Q-Methodology Study of Stakeholder Perspectives
Authors: Osborne Raine , Janson Chris , Black Lisa , Jensen Gail M 
Published: October 2019

Abstract

Background
Residency training is recognized as a valuable form of professional development and pathway to specialization. Currently residency is voluntary for physical therapists, with less than 12% of DPT students choosing to apply upon graduation. Motivations that drive the decision to pursue residency are currently unknown as is the extent of similarity and difference in perspective among various stakeholders.

Objective
The purpose of this study was to identify the dominant perspectives on motivations to pursue residency held by various stakeholders.

Design
This study was conducted using Q Methodology, which incorporates aspects of quantitative and qualitative techniques into the examination of human subjectivity.

Methods
Program directors, faculty, and current residents from all accredited physical therapy residency programs were invited to complete a forced-choice sorting activity where potential motivations for residency were sorted by perceived level of importance. Principal component analysis was used to identify dominant perspectives, which were interpreted based on emergent themes in the cluster of motivations identified as most important.

Results
Four dominant perspectives were identified: (1) desire to provide better patient care, (2) preparation for specialty practice, (3) fast track to expert practice, and (4) career advancement. These perspectives provided context and utility to 2 broad meta-motivations: improved clinical reasoning and receiving mentoring. Both within- and between-group differences among stakeholders were identified. However, subsets from each role-group population were found to share similar perspectives.

Limitations
Results from this study may not apply to potential residents in all specialty areas, and the implications of having a particular perspective are unknown.

Conclusions
Identification of the dominant perspective on motivations for pursuing residency may aid in promoting participation, program development, matching residents to programs and mentors, and future research.
Normative Responses to Clinical Tests for Cervicogenic Dizziness: Clinical Cervical Torsion Test and Head-Neck Differentiation Test
Authors: Treleaven Julia , Joloud Vladimir , Nevo Yoav , Radcliffe Clare , Ryder Mollie 
Published: October 2019

Abstract

Background
The clinical diagnosis of cervicogenic dizziness (CGD) is challenging because of a lack of sensitive and specific diagnostic tests. It is vital for clinicians to know normative responses to suggested clinical tests to help them develop the method and interpretation of these tests and maximize their diagnostic value for CGD.

Objective
The purpose of the study was to determine normative responses to the clinical application of the cervical torsion test and the head-neck differentiation test, with consideration of different age groups and sex.

Design
This was an observational study.

Methods
One hundred forty-seven people who were healthy and asymptomatic served as controls and performed both tests, which involved 3 components: cervical torsion, cervical rotation, and en bloc rotation (head and trunk rotation together).

Results
Thirty-five (23.81%) of the 147 participants reported some symptoms (mild dizziness, visual disturbances, unusual eye movements on opening eyes after the test, motion sickness, or nausea) on 1 or more of the 3 test components in either test. The specificity when using a positive response to torsion alone (ie, a negative response to the rotation or en bloc component) was high (for the cervical torsion test, 98.64%; for the head-neck differentiation test, 89.8%), as participants with likely global sensorimotor sensitivity were eliminated. The combined specificity was 100%, as no participants presented with exclusive positive torsion results in both tests. Age and sex did not influence the results.

Limitations
There were several examiners who were not blinded.

Conclusions
Confirmation of the high specificity of these clinical tests with the method used in this study to conduct and interpret the results will allow future research to determine the sensitivity of these clinical measures in a population with CGD and specificity in those with dizziness of other origins.