bluuebunny/crossref_metadata_2025_split huggingface dataset:
Establishing effective STEM mentoring relationships through mentor training
Authors: Stelter Rebecca L. , Kupersmidt Janis B. , Stump Kathryn N. 
Published: September 2020

AbstractScience, technology, engineering, and math (STEM) mentoring programs typically have the goals of generating interest and excitement in STEM topics and careers and supporting STEM career achievement persistence. These outcomes are fostered through positive and trusting relationships with mentors. Mentors in STEM programs often have extensive subject matter expertise in a STEM content area, but they may lack the knowledge, attitudes, and skills that are important for establishing an effective mentoring relationship with a young person. The purpose of this review is to describe (1) a set of topics recommended for inclusion in STEM mentor training, based on a literature review, and (2) the current state of implementation of these recommended training topics among STEM mentoring programs in the United States. We have identified four major topic areas to include in the training of STEM mentors: (1) knowledge and attitudes regarding disparities in STEM career achievement, (2) mentor roles that promote STEM outcomes, (3) behaviors to promote mentees’ positive attitudes about STEM, and (4) program‐specific topics. Training for mentors should prepare them with the knowledge they need to support their mentee being successful in a STEM education or career while fostering the skills they need to establish an effective mentoring relationship.
Epidemiological, clinical, radiographic characterization of non‐syndromic supernumerary teeth in Chinese children and adolescents
Authors: Ma Xiaowei , Jiang Yue , Ge Han , Yao Yuan , Wang Yanling , Mei Yufeng , Wang Dongmiao 
Published: September 2020

AbstractObjectiveThis retrospective study was purposed to evaluate epidemiological, clinical, and 3D radiological features of supernumerary teeth (ST) in a non‐syndromic Chinese children and adolescent dental population.Materials and MethodsOriginal cone‐beam CT (CBCT) data from 18,861 patients aged from 6 to 17 years with dental maxillofacial diseases treated in a Chinese dental hospital from June 2012 to December 2018 were utilized to screen patients with ST. Diagnosis and characterizations of ST were analyzed by CBCT coupled with 3D reconstruction. All relevant epidemiological, clinical, and radiographic details about ST were collected and statistically analyzed.ResultsAmong total 18,861 patients, 2,768 ST were identified in 1984 subjects with a prevalence of 10.52% and a male:female ratio of 1.86:1. Majority of ST were single, conical, inverted, impacted, and located in maxilla anterior region. ST‐associated complications mainly included malposition, rotation, and impaction of adjacent teeth, which were notably associated with morphology and position of ST.ConclusionThe prevalence of ST in Chinese children and adolescent dental population was 10.52% and tended to present as single, conical, inverted, and impacted, which resulted in abnormalities of neighboring teeth. Our outcomes are beneficial for clinicians to more comprehensively understand the incidence, characterization, and clinical treatment planning of ST in dental children and adolescents.
Externalism, internalism, and meaningful lives
Authors: Landau Iddo 
Published: September 2020

AbstractThis paper argues that participants in the subjectivism/objectivism/hybridism debate, a central issue in recent meaning in life research, conflate two different distinctions marked by the termsobjectiveandsubjective, one having to do with the question of whether life's meaningfulness depends on factors internal or external to the agent, the other having to do with the question of whether there is any ‘absolute’ as opposed to ‘relative’ truth about the first question. The paper then argues that a distinctive type of hybridism with respect to the first sense is true. To vindicate this type of hybridism, the paper identifies, by using examples and counterexamples, internal and external necessary conditions for having meaningful lives. In this type of hybridism, internal states that are not directed at external factors, such as autonomy, serenity and contentment, are also taken account of, and, more generally, internal and external factors need not relate to each other at all. Further, although the more a combination of internal and external factors is valuable the more meaningful a life is, not any increase in the value of any relevant internal or external factor enhances meaning.
Evolution of the African slippery frogs (Anura: Conraua), including the world’s largest living frog
Authors: Blackburn David C. , Nielsen Stuart V. , Barej Michael F. , Doumbia Joseph , Hirschfeld Mareike , Kouamé N’Goran G. , Lawson Dwight , Loader Simon , Ofori‐Boateng Caleb , Stanley Edward L. , Rödel Mark‐Oliver 
Published: September 2020

AbstractAlthough Conraua goliath is well known as the largest living frog species, the diversity and evolution of the genus Conraua across sub‐Saharan Africa remain poorly understood. We present multilocus phylogenetic analyses of the six currently recognized species that provide insights into divergence times, biogeography, body size evolution and undescribed species. An analysis of divergence times demonstrates that crown‐group Conraua arose some time during the latest Oligocene to mid‐Miocene followed by divergence into major lineages in the mid‐Miocene that may reflect the fragmentation of widespread tropical forests in Africa that began at this time. We find three pairs of sister species, C. crassipes + C. beccarii, C. alleni + C. derooi and C. goliath + C. robusta, each of which diverged during the Miocene. These relationships reject phylogenetic hypotheses based solely on biogeography as the geographically peripheral C. beccarii from north‐eastern Africa is nested within western African species and the Central African species do not form a clade. Our species delimitation analyses provide support for undescribed species in C. alleni, C. beccarii and C. derooi, and possibly C. crassipes, suggesting that the current taxonomy substantially underestimates species diversity. There is no clear directional trend of either increasing or decreasing body size in Conraua and the three largest species do not form a clade. With a robust phylogenetic hypothesis in hand, further field‐based studies are needed to understand the evolution of morphology and life history in this charismatic African anuran clade.
Is There an Alternative to China?
Authors: Kosowatz John 
Published: September 2020

Abstract
The global supply chain shutdown during the pandemic put the spotlight on China, where the great bulk of the world’s goods are manufactured. The coronavirus highlighted the vulnerabilities of concentrating so much production in one place. Even though some industries are considering establishing new, domestic manufacturing plants in light of the vulnerabilities exposed during the first months of the COVID-19 crisis. The sheer size of the Chinese market, however, will keep a hold on U.S. and other manufacturers, at least for now.
Bifurcation and Chaos of a Spur Gear Transmission System With Non-Uniform Wear
Authors: Geng Zhibo , Xiao Ke , Li Junyang , Wang Jiaxu 
Published: September 2020

Abstract
In this study, a nonlinear dynamic model of a spur gear transmission system with non-uniform wear is proposed to analyze the interaction between surface wear and nonlinear dynamic characteristics. A quasi-static non-uniform wear model is presented, with consideration of the effects of operating time on mesh stiffness and gear backlash. Furthermore, a nonlinear dynamic model with six degrees-of-freedom is established considering surface friction, time-varying gear backlash, time-varying mesh stiffness, and eccentricity, and the Runge–Kutta method applied to solve this model. The bifurcation and chaos in the proposed dynamic model with the change of the operating time and the excitation frequency are investigated by bifurcation and spectrum waterfall diagrams to analyze the bifurcation characteristics and the dimensionless mesh force. It is found that surface wear is generated with a change in operating time and affects the nonlinear dynamic characteristics of the spur gear system. This study provides a better understanding of nonlinear dynamic characteristics of gear transmission systems operating under actual conditions.
A Model of Mixed Lubrication for the Repeated Sliding Problem Considering the Reloading Characteristic: Application to Ring/Liner Conjunction
Authors: Gu Chunxing , Zhang Di , Ding Xiaohong , Wang Shuwen 
Published: September 2020

Abstract
Loading, unloading, and reloading of rough surface contacts are common for most friction pairs. However, usually, only loading characteristic is concerned in the modeling of the cyclic loading problem. In this paper, a comprehensive mathematical model of mixed lubrication was developed for the lubricated friction pairs under cyclic loading. The metal contact was calculated by an improved asperity contact model of elastic–plastic with the loading, unloading, and reloading characteristics in consideration. The developed model was applied to the ring/liner conjunction, as its contact problem was the typical cyclic loading problem. Different from the previous studies, assuming the “virgin” topography of the rough surface, the current one accounts for the plastic deformation of surface asperities, occurring during the first few cycles and leading to the significant roughness modification. It appears that considering the reloading characteristics is necessary, whether it is a Gaussian surface contact or a non-Gaussian surface contact.
Influence of the Alumina Ceramic Coating on Friction and Stability of the Iron Contacts
Authors: Sang Le Van , Sugimura Natsuko , Washizu Hitoshi 
Published: September 2020

Abstract
The study focuses on monitoring influence of the alumina coatings on friction and stability of the microscale iron contacts by the smoothed particle hydrodynamics. The obtained results show a better stability and a higher value of the friction coefficient of the coated surface compared to those of the uncoated one. This study also supposes that in concern of stability of the surface the coating should be done with only the substrate surface accompanied with the roughness of the coating layer. The proportion of the coated particles is found to be strongly resulting in the friction properties, and the roughness of the coating layer also slightly results in those. The surface reaches the most stability at the proportion of around 70%.
Exergetic Performance Assessment of Optimally Inclined BIPV Thermal System by Considering Cyclic Nature of Insolation
Authors: Yadav Somil , Panda S. K. , Hachem-Vermette Caroline , Tiwari G. N. 
Published: September 2020

Abstract
The structural and architectural elements of building-integrated photovoltaic-thermal (BIPVT) systems are made up of photovoltaic (PV) modules and these are required to be fixed at an optimum inclination angle for generating maximum exergy. This work presents an attempt to determine the amount of exergy generated by an optimally inclined double-storied BIPV thermal system by considering the actual cyclic nature of insolation, surrounding air temperature, PV cell temperature, intermediate slab temperature, and the chamber temperature. The insolation value, which is computed by an anisotropic sky model along with these cyclic variables, is used for solving the set of governing differential equations for evaluating the exergy of the system. Other influencing parameters of the BIPV thermal systems such as air changes in both chambers, packing factor of PV module, the orientation of PV module, and thickness of the intermediate slab are considered for finding its effect on the total exergy of the system. Numerical results show that for packing factor more than 0.6, there is no significant change in total heat exergy with respect to the inclination angle. For packing factor more than 0.3, the generation of electrical exergy exceeds the heat exergy, and the overall exergy of BIPVT system decreases with rise in packing factor (βm) up to 0.3 and then rises nonlinearly.
Association between quadrivalent human papillomavirus vaccination and selected syndromes with autonomic dysfunction in Danish females: population based, self-controlled, case series analysis
Authors: Hviid Anders , Thorsen Nicklas M , Valentiner-Branth Palle , Frisch Morten , Mølbak Kåre 
Published: September 2020

Abstract

Objective
To evaluate the association between quadrivalent human papillomavirus vaccination and syndromes with autonomic dysfunction, such as chronic fatigue syndrome, complex regional pain syndrome, and postural orthostatic tachycardia syndrome.

Design
Population-based self-controlled case series.

Setting
Information on human papillomavirus vaccinations and selected syndromes with autonomic dysfunction (chronic fatigue syndrome, complex regional pain syndrome, and postural orthostatic tachycardia syndrome) identified using ICD-10 (international classification of diseases, revision 10) diagnostic codes from Danish nationwide registers.

Participants
869 patients with autonomic dysfunction syndromes from a cohort of 1 375 737 Danish born female participants aged 10 to 44 years during 2007-16.

Main outcome measures
Self-controlled case series rate ratios (95% confidence intervals) of the composite outcome of chronic fatigue syndrome, complex regional pain syndrome, and postural orthostatic tachycardia syndrome, adjusted for age and season, comparing female participants vaccinated and unvaccinated with the quadrivalent human papillomavirus vaccine. Chronic fatigue syndrome, complex regional pain syndrome, and postural orthostatic tachycardia syndrome were also considered separately in secondary analyses.

Results
During 10 581 902 person years of follow-up, 869 female participants with syndromes of autonomic dysfunction (136 with chronic fatigue syndrome, 535 with complex regional pain syndrome, and 198 with postural orthostatic tachycardia syndrome) were identified. Quadrivalent human papillomavirus vaccination did not statistically significantly increase the rate of a composite outcome of all syndromes with autonomic dysfunction in a 365 day risk period following vaccination (rate ratio 0.99, 95% confidence interval 0.74 to 1.32) or the rate of any individual syndrome in the risk period (chronic fatigue syndrome (0.38, 0.13 to 1.09), complex regional pain syndrome (1.31, 0.91 to 1.90), or postural orthostatic tachycardia syndrome (0.86, 0.48 to 1.54)).

Conclusions
When vaccination is introduced, adverse events could occur in close temporal relation to the vaccine purely by chance. These results do not support a causal association between quadrivalent human papillomavirus vaccination and chronic fatigue syndrome, complex regional pain syndrome, or postural orthostatic tachycardia syndrome, either individually or as a composite outcome. An increased risk of up to 32% cannot be formally excluded, but the statistical power of the study suggests that a larger increase in the rate of any syndrome associated with vaccination is unlikely.
Stress among medical students: factor structure of the University Stress Scale among Italian students
Authors: Portoghese Igor , Porru Fabio , Galletta Maura , Campagna Marcello , Burdorf Alex 
Published: September 2020

ObjectivesThe main purpose of the current study was to investigate the psychometric properties of the Italian version of the University Stress Scale (USS) among Italian medical students.Design, setting and participantsA cross-sectional observational study based on data from an online cross-sectional survey from 11 to 23 December 2018. A total of 1858 Italian medical students participated in the study.Outcome measuresWe measured perceived stress among medical students using the USS, the Effort-Reward Imbalance Student Questionnaire (ERI-SQ) and the Kessler-10 (K10).ResultsResults showed that a bifactor-Exploratory Structural Equation Modeling solution provided excellent levels of fit to the data. Our results suggest that the modified version of 19 items of the Italian version of the USS does not have a simple unidimensional structure. Overall, an inspection of ancillary indices (omega indices, ECV and percentage of uncontaminated correlations) revealed that these were too low to suggest the use of the USS as a composite measure of university stress. We tested an alternative unidimensional short form (eight items; USS-S) that assessed all the five sources of stress. This version provided a good fit to the data. Evidence of convergent validity of the USS-S was observed by analysing the correlations between the USS and ERI-SQ (ranging from −0.34 to 0.37, all p<0.01). Finally, based on the clinical cut-off recommended on the K10, results from receiver operating characteristic showed that considering the clinical cut-off of the USS is 7.5 and that 59.70% of medical students reported stress levels in the clinical range.ConclusionFinally, our results showed a lack of support for using the USS to measure a general university stress factor, as the general USS factor accounted for little variance in our sample. In this sense, stress scores among Italian students can be better assessed by the use of the USS-S.
Identification and prevalence of frailty in diabetes mellitus and association with clinical outcomes: a systematic review protocol
Authors: Hanlon Peter , Fauré Isabella , Corcoran Neave , Butterly Elaine , Lewsey Jim , McAllister David A , Mair Frances S 
Published: September 2020

IntroductionDiabetes mellitus is common and growing in prevalence, and an increasing proportion of people with diabetes are living to older age. Frailty is, therefore, becoming an important concept in diabetes. Frailty is associated with older age and describes a state of increased susceptibility to decompensation in response to physiological stress. A range of measures have been used to quantify frailty. This systematic review aims to identify measures used to quantify frailty in people with diabetes (any type); to summarise the prevalence of frailty in diabetes; and to describe the relationship between frailty and adverse clinical outcomes in people with diabetes.Methods and analysisThree electronic databases (Medline, Embase and Web of Science) will be searched from 2000 to November 2019 and supplemented by citation searching of relevant articles and hand searching of reference lists. Two reviewers will independently review titles, abstracts and full texts. Inclusion criteria include: (1) adults with any type of diabetes mellitus; (2) quantify frailty using any validated frailty measure; (3) report the prevalence of frailty and/or the association between frailty and clinical outcomes in people with diabetes; (4) studies that assess generic (eg, mortality, hospital admission and falls) or diabetes-specific outcomes (eg, hypoglycaemic episodes, cardiovascular events, diabetic nephropathy and diabetic retinopathy); (5) cross-sectional and longitudinal observational studies. Study quality will be assessed using the Newcastle–Ottawa Scale for observational studies. Clinical and methodological heterogeneity will be assessed, and a random effects meta-analysis performed if appropriate. Otherwise, a narrative synthesis will be performed.Ethics and disseminationThis manuscript describes the protocol for a systematic review of observational studies and does not require ethical approval.PROSPERO registration numberCRD42020163109.
Theory-based mobile phone text messaging intervention for blood pressure control (TEXT4BP) among hypertensive patients in Nepal: study protocol for a feasibility randomised controlled trial
Authors: Bhandari Buna , Narasimhan Padmanesan , Vaidya Abhinav , Jayasuriya Rohan 
Published: September 2020

IntroductionUncontrolled blood pressure is one of the main risk factors for cardiovascular disease and death in Low-income and middle-income countries. Improvements to medication adherence and lifestyle changes can be assisted by using mobile phone text messaging interventions. This study aims to test the feasibility and acceptability of a text messaging intervention for blood pressure control ‘(TEXT4BP)’, developed based on behavioural change theory to improve treatment adherence and lifestyle change among hypertensive patients in Nepal.Methods and analysisThe TEXT4BP intervention will be tested using a two-arm parallel-group, unblinded, individually randomised controlled trial. This feasibility study would recruit 200 clinically diagnosed hypertensive patients aged 18–69 years, currently receiving blood pressure-lowering medication for more than 3 months, visiting a tertiary healthcare facility in Kathmandu, Nepal. A nested qualitative study will assess the acceptability of the short message service intervention. The intervention group will receive text messages containing information on hypertension, diet, medication and physical activity three times a week for 3 months. The control group will receive standard care. At baseline and 3 months, measures of medication adherence, salt intake, physical activity and blood pressure will be collected. Feasibility measures, such as differential rates of recruitment and attrition rates, will be calculated. Acceptability of text message interventions will be studied using usability measures and in-depth interviews among intervention group participants. This pilot study is not funded.Ethics and disseminationThis study has received ethics approval from the University of New South Wales Human Research Ethics Committee B (HC190357), Nepal Health Research Council (302/2019) and Institutional Review Committee of Kathmandu Medical College and Teaching Hospital Kathmandu, Nepal (030520192). The findings of the study will be disseminated through peer-reviewed publications and conference presentations.Trial registration numberACTRN12619001213134.