bluuebunny/crossref_metadata_2025_split huggingface dataset:
Iterated Extensions and Uniserial Length Categories
Authors: Eriksen Eivind 
Published: March 2020

AbstractIn this paper, we study length categories using iterated extensions. We fix a fieldk, and for any familySof orthogonalk-rational points in an Abeliank-category$\mathcal {A}$A, we consider the categoryExt(S) of iterated extensions ofSin$\mathcal {A}$A, equipped with the natural forgetful functor$\mathbf {Ext}(\mathsf {S}) \to \mathbf {\mathcal {A}}(\mathsf {S})$Ext(S)→A(S)into the length category$\mathbf {\mathcal {A}}(\mathsf {S})$A(S). There is a necessary and sufficient condition for a length category to be uniserial, due to Gabriel, expressed in terms of the Gabriel quiver (or Ext-quiver) of the length category. Using Gabriel’s criterion, we give a complete classification of the indecomposable objects in$\mathbf {\mathcal {A}}(\mathsf {S})$A(S)when it is a uniserial length category. In particular, we prove that there is an obstruction for a path in the Gabriel quiver to give rise to an indecomposable object. The obstruction vanishes in the hereditary case, and can in general be expressed using matric Massey products. We discuss the close connection between this obstruction, and the noncommutative deformations of the familySin$\mathcal {A}$A. As an application, we classify all graded holonomicD-modules on a monomial curve over the complex numbers, obtaining the most explicit results over the affine line, whenDis the first Weyl algebra. We also give a non-hereditary example, where we compute the obstructions and show that they do not vanish.
Disclosure of Same-Sex Sexual Practices to Family and Healthcare Providers by Men Who Have Sex with Men and Transgender Women in Nigeria
Authors: Kokogho Afoke , Amusu Senate , Baral Stefan D. , Charurat Manhattan E. , Adebajo Sylvia , Makanjuola Olumide , Tonwe Veronica , Storme Casey , Michael Nelson L. , Robb Merlin L. , Ake Julie A. , Nowak Rebecca G. , Crowell Trevor A. ,   for the TRUST/RV368 Study Group
Published: March 2020

AbstractDisclosure of same-sex sexual practices by men who have sex with men (MSM) and transgender women (TGW) may facilitate appropriate healthcare engagement, including risk assessment for HIV and other sexually transmitted infections (STIs), and negotiation of condom use with partners. However, disclosure may also generate stigma. In these cross-sectional analyses, MSM and TGW were categorized based on self-report of disclosure to family members and healthcare providers (HCP) at enrollment into the TRUST/RV368 study of comprehensive HIV and STI care programs in Abuja and Lagos, Nigeria. Multivariable Poisson regression models with robust error variance were used to estimate relative risk of disclosure with 95% confidence intervals. Pearson’s chi-squared test was used to compare condom use and stigma indicators by disclosure status. Of 2557 participants who answered baseline questions about disclosure, 384 (15.0%) had ever disclosed to a family member and 733 (28.7%) to HCP, including 192 (7.5%) who disclosed to both. Higher education, prevalent HIV infections, and residence in Lagos were each associated with increased likelihood of disclosure to family and HCP. Older participants were more likely to disclose to HCP but not family. Participants who made a disclosure to family or HCP were more likely to report condom use during anal sex as well as perceived and experienced stigma that included healthcare avoidance, blackmail, assault, and sexual violence as compared to participants who had not disclosed. Improved disclosure practices within safe spaces may enhance engagement of MSM and TGW in healthcare and HIV prevention services.
VR4Health: Personalized teaching and learning anatomy using VR
Authors: Fairén M. , Moyés J. , Insa E. 
Published: March 2020

AbstractVirtual Reality (VR) is being integrated into many different areas of our lives, from industrial engineering to video-games, and also including teaching and education. We have several examples where VR has been used to engage students and facilitate their 3D spatial understanding, but can VR help also teachers? What are the benefits teachers can obtain on using VR applications? In this paper we present an application (VR4Health) designed to allow students to directly inspect 3D models of several human organs by using Virtual Reality systems. The application is designed to be used in an HMD device autonomously as a self-learning tool and also reports information to teachers in order that he/she becomes aware of what the students do and can redirect his/her work to the concrete necessities of the student. We evaluate both the students’ and the teachers’ perception by doing an experiment and asking them to fill-in a questionnaire at the end of the experiment.
Local Ultrasonic Resonance Spectroscopy: A Demonstration on Plate Inspection
Authors: Rus J. , Grosse C. U. 
Published: March 2020

AbstractLocal ultrasonic resonance spectroscopy (LURS) is a new approach to ultrasound signal analysis, which was necessitated by a novel inspection method capable of the contact-free, localized, broadband generation and detection of ultrasound. By performing a LURS scan, it is possible to detect local mechanical resonances of various features and of the specimen itself. They are highly sensitive to local mechanical properties. By observing different parameters in the frequency spectrum (e.g., resonance amplitude and resonance peak frequency), geometrical, material and condition properties can be visualized for all of the scanning positions. We demonstrate LURS for inspection of a carbon fiber reinforced polymer plate. Local defect resonances of delaminations and a flat-bottom hole were detected in the frequency range from 25 to 110 kHz. Analyzing the higher frequency range (0.3 MHz to 1.5 MHz) of the same scan, the shift of the thickness resonance frequency of the plate and its higher-order resonance frequencies carry the information about the aluminum inclusions. LURS shows an advantage in characterizing the localized features of the specimens via contact-free ultrasonic inspection.
Using olfactory media cues in e-learning – perspectives from an empirical investigation
Authors: Alkasasbeh Anas Ali , Ghinea Gheorghita 
Published: March 2020

AbstractPeople interact with computers using their senses. Currently, in a digital context, traditional digital media like videos and images used to convey information to users, and these media can be used as a source of information. However, relatively few studies have been conducted on olfactory media as a source of information in a digital context. In this paper, we report on a study that examined the possibility of using olfactory media as a source of information and whether its usage as informational cues enhances learning performance and user Quality of Experience (QoE). To this end, an olfactory-enhanced quiz (web-based) was developed about four countries. The quiz contained different types of questions employing four types of digital media in their contents: text, image, audio and olfactory media. Four scents were used that were considered to be related to the respective countries. Sixty-four participants were invited to our experiment to evaluate this application. Our results revealed that usage of olfactory media synchronised with traditional digital media had a significant impact on learner performance compared to the case when no olfactory media was employed. In respect of user QoE, it was found that olfactory media influenced users positively; moreover, they were passionate about engaging with enhanced olfactory applications in the future.
An analog of the Dougall formula and of the de Branges–Wilson integral
Authors: Neretin Yury A. 
Published: March 2020

AbstractWe derive a beta-integral over $${\mathbb {Z}}\times {\mathbb {R}}$$

Z
×
R

, which is a counterpart of the Dougall $$_5H_5$$

5

H
5

-formula and of the de Branges–Wilson integral, our integral includes $$_{10}H_{10}$$

10

H
10

-summation. For a derivation we use a two-dimensional integral transform related to representations of the Lorentz group, this transform is a counterpart of the Olevskii index transform (a synonym: Jacobi transform).
A Computationally Efficient, Time-Dependent Model of the Solar Wind for Use as a Surrogate to Three-Dimensional Numerical Magnetohydrodynamic Simulations
Authors: Owens Mathew , Lang Matthew , Barnard Luke , Riley Pete , Ben-Nun Michal , Scott Chris J. , Lockwood Mike , Reiss Martin A. , Arge Charles N. , Gonzi Siegfried 
Published: March 2020

AbstractNear-Earth solar-wind conditions, including disturbances generated by coronal mass ejections (CMEs), are routinely forecast using three-dimensional, numerical magnetohydrodynamic (MHD) models of the heliosphere. The resulting forecast errors are largely the result of uncertainty in the near-Sun boundary conditions, rather than heliospheric model physics or numerics. Thus ensembles of heliospheric model runs with perturbed initial conditions are used to estimate forecast uncertainty. MHD heliospheric models are relatively cheap in computational terms, requiring tens of minutes to an hour to simulate CME propagation from the Sun to Earth. Thus such ensembles can be run operationally. However, ensemble size is typically limited to $10^{1}$101 to $10^{2}$102 members, which may be inadequate to sample the relevant high-dimensional parameter space. Here, we describe a simplified solar-wind model that can estimate CME arrival time in approximately 0.01 seconds on a modest desktop computer and thus enables significantly larger ensembles. It is a one-dimensional, incompressible, hydrodynamic model, which has previously been used for the steady-state solar wind, but it is here used in time-dependent form. This approach is shown to adequately emulate the MHD solutions to the same boundary conditions for both steady-state solar wind and CME-like disturbances. We suggest it could serve as a “surrogate” model for the full three-dimensional MHD models. For example, ensembles of $10^{5}$105 to $10^{6}$106 members can be used to identify regions of parameter space for more detailed investigation by the MHD models. Similarly, the simplicity of the model means it can be rewritten as an adjoint model, enabling variational data assimilation with MHD models without the need to alter their code. The model code is available as an Open Source download in the Python language.
The Situational Mental File Account of the False Belief Tasks: A New Solution of the Paradox of False Belief Understanding
Authors: Newen Albert , Wolf Julia 
Published: March 2020

AbstractHow can we solve the paradox of false-belief understanding:if infants pass the implicit false belief task (FBT) by nonverbal behavioural responses why do they nonetheless typically fail the explicit FBT till they are 4 years old? Starting with the divide between situational and cognitive accounts of the development of false-belief understanding, we argue that we need to consider both situational and internal cognitive factors together and describe their interaction to adequately explain the development of children’s Theory of Mind (ToM) ability. We then argue that a further challenge is raised for existing accounts by helping behaviour versions of the FBT. We argue that the common two-stage accounts are inadequate: we need to allow forthree central stagesin a continuous development. Furthermore, drawing on Perner et al.’s (Cognition145: 77–88, 2015) and Perner and Leahy’s (Review of Philosophy and Psychology7 (2): 491–508, 2016) recent mental files account, we provide a new account of the development of these three stages of ToM ability by describing the changes of the structure and organisation of mental files including the systematic triggering role of types of situations. Thereby we aim to establish asituational mental file (SMF) accountas a new and adequate solution to the paradox of false-belief understanding.
The identification of probable sarcopenia in early old age based on the SARC-F tool and clinical suspicion: findings from the 1946 British birth cohort
Authors: Dodds R. M. , Murray J. C. , Robinson S. M. , Sayer A. A. 
Published: March 2020

AbstractPurposeThe European Working Group on Sarcopenia in Older People 2 (EWGSOP2) consensus definition introduced the concept of probable sarcopenia as a basis on which to begin treatment. Our aims were to describe the prevalence of probable sarcopenia in older adults and to investigate the utility of (1) the SARC-F tool and (2) clinical risk factors for the identification of those likely to have probable sarcopenia.MethodsWe used data from the 1946 British birth cohort at age 69, with 1686 participants included in the analyses. We used the EWGSOP2 cut points for weak grip strength and slow chair rise time, with the presence of one or both indicating probable sarcopenia. We examined the sensitivity and specificity of the SARC-F tool for probable sarcopenia. We also examined associations between clinical risk factors and probable sarcopenia.ResultsThe prevalence of probable sarcopenia was 19%. A SARC-F score of ≥ 4 had low sensitivity (15%) and high specificity (99%) for probable sarcopenia, whereas a score of ≥ 1 had higher sensitivity (65%) and reasonable specificity (72%). Three clinical risk factors were independently associated with probable sarcopenia: polypharmacy [OR 2.7 (95% CI 1.7, 4.2)], lower body osteoarthritis [OR 1.8 (95% CI 1.3, 2.6)] and physical inactivity [OR of 2.1 (95% CI 1.5, 2.8)].ConclusionWe have shown that EWGSOP2 probable sarcopenia is common in community-dwelling adults in early old age. Those with any positive responses to the questions in the SARC-F tool, a history of polypharmacy, lower body osteoarthritis or physical inactivity should be prioritised for the assessment of muscle strength.
Comparing multidimensional sensor data from vehicle fleets with methods of sequential data mining
Authors: Hartung Julia , Gühring Gabriele , Licht Valentin , Warta Alexander 
Published: March 2020

AbstractReading and understanding large amounts of sensor data from vehicle test drives becomes more and more important. In order to test vehicle components or analyze exhaust emissions in real test drives, the sensor data obtained from these test drives have to be comparable. Otherwise components or exhaust emissions are tested and analyzed under false conditions. The sensor data obtained during test drives are highly multidimensional which makes it even more complicated to identify recurring patterns. We present a process model to compare different test drives according to their sensor data and so give an answer to the question whether or not test drives in different cities, locations and environments are representative to real driving scenarios. The algorithms we use focus on segmentation of the individual multivariate test drive data and on clustering of the segments according to different methods. We present several segmentation and cluster methods and compare which of them is best suited for comparing test drives. The segmentation method we identified as best suited is based on principal component analysis. As cluster methods we examine hierarchical, partitioning and density-based clustering in detail.
Mechanisms of UV-induced mutations and skin cancer
Authors: Pfeifer Gerd P. 
Published: March 2020

AbstractUltraviolet (UV) irradiation causes various types of DNA damage, which leads to specific mutations and the emergence of skin cancer in humans, often decades after initial exposure. Different UV wavelengths cause the formation of prominent UV-induced DNA lesions. Most of these lesions are removed by the nucleotide excision repair pathway, which is defective in rare genetic skin disorders referred to as xeroderma pigmentosum. A major role in inducing sunlight-dependent skin cancer mutations is assigned to the cyclobutane pyrimidine dimers (CPDs). In this review, we discuss the mechanisms of UV damage induction, the genomic distribution of this damage, relevant DNA repair mechanisms, the proposed mechanisms of how UV-induced CPDs bring about DNA replication-dependent mutagenicity in mammalian cells, and the strong signature of UV damage and mutagenesis found in skin cancer genomes.
Commitment and communication: Are we committed to what we mean, or what we say?
Authors: BONALUMI FRANCESCA , SCOTT-PHILLIPS THOM , TACHA JULIUS , HEINTZ CHRISTOPHE 
Published: March 2020

ABSTRACTAre communicators perceived as committed to what they actually say (what is explicit), or to what they mean (including what is implicit)? Some research claims that explicit communication leads to a higher attribution of commitment and more accountability than implicit communication. Here we present theoretical arguments and experimental data to the contrary. We present three studies exploring whether the saying–meaning distinction affects commitment attribution in promises, and, crucially, whether commitment attribution is further modulated by the degree to which the hearer will actually rely on the promise. Our results support the conclusion that people perceive communicators to be committed to ‘what is meant’, and not simply to ‘what is said’. Our findings add to the experimental literature showing that the saying–meaning distinction is not as pivotal to social relations as often assumed, and that its role in commitment attribution might be overestimated. The attribution of commitment is strongly dependent on the (mutually known) relevance of ‘what is meant’.
Ketamine and neuroticism: a double-hit hypothesis of internalizing disorders
Authors: McNaughton N. , Glue P. 
Published: March 2020

AbstractPsychiatric disorders can often be viewed as extremes of personality traits. The primary action of drugs that ameliorate these disorders may, thus, be to alter the patient’s position on a relevant trait dimension. Here, we suggest that interactions between such trait dimensions may also be important for disorder. Internalizing disorders show important differences in terms of range of activity and speed of response of medications. Established antidepressant and anxiolytic medications are slow in onset and have differing effects across different internalizing disorders. In contrast, low-dose ketamine is rapidly effective and improves symptom ratings in all internalizing disorders. To account for this, we propose a “double hit” model for internalizing disorders: generation (and maintenance) require two distinct forms of neural dysfunction to coincide. One hit, sensitive to ketamine, is disorder-general: dysfunction of a neural system linked to high levels of the personality trait of neuroticism. The other hit is disorder-specific: dysfunction of one of a set of disorder-specific neural modules, each with its own particular pattern of sensitivity to conventional drugs. Our hypothesis applies only to internalizing disorders. So, we predict that ketamine will be effective in simple phobia and (perhaps partially) in anorexia nervosa, but would make no such prediction about other disorders where neuroticism might also be important secondarily (e.g. attention deficit hyperactivity disorder and schizophrenia).
Palaeoecological and palaeoclimatic conditions on the Karelian Isthmus (northwestern Russia) during the Holocene
Authors: Nazarova Larisa , Syrykh Liudmila S. , Mayfield Roseanna J. , Frolova Larisa A. , Ibragimova Aisylu G. , Grekov Ivan M. , Subetto Dmitry A. 
Published: March 2020

AbstractThe Holocene evolution of climate in easternmost Fennoscandia and adjoining regions is poorly known, compared with regions to the west. To address this, a 224-cm-long sediment core from Lake Medvedevskoe, situated on the Central Upland of the Karelian Isthmus, northwestern Russia, was examined to investigate variations in the Holocene climate. Analyses indicate that the dry and cold late Pleistocene climate was replaced by the warmer and more humid early Holocene climate after ca. 10.5 cal ka BP. During the early Holocene, the lake transitioned from an oligotrophic to a mesotrophic state, characterized by a “Corynocera ambigua/Microtendipes pedellus-type” phase, which has been found in other lakes across Fennoscandia. Taxonomic shifts in the chironomid and cladoceran communities associated with climatic amelioration were identified at ca. 10.6 and 9.17 cal ka BP using breakpoint analysis. Reconstructed July temperatures indicate climatic patterns comparable to those seen in eastern Fennoscandia. The warm period between ca. 9.5 and 5.5 cal ka BP (T July 14.5–15°C) was interrupted by a slight cooling between ca. 8.5 and 8.1 cal ka BP, possibly relating to the 8.2 event, with peak temperature reached at ca. 7.8 cal ka BP. Neoglacial cooling started after ca. 5.5 cal ka BP, the median reconstructed July temperature dropped to 2–3°C cooler than present (mean T July 13.5°C) before recovering in recent time.
Identification and verification of differentially expressed genes in yak mammary tissue during the lactation cycle
Authors: Yuan Mao , Xia Wei , Zhang Xiaolei , Liu Yongtao , Jiang Mingfeng 
Published: March 2020

AbstractYaks (Bos grunniens) live primarily in the Qinghai-Tibetan plateau (altitude: 2000–5000 m). Their milk presents unusual characteristics, containing large amounts of solids including fat and protein, and it is, therefore, important to understand the genetic makeup of the yak. To identify potentially critical genes playing a role in yak mammary tissue from colostrum to mature milk phase of lactogenesis, the early lactation (colostrum) stage (ELS; day 1 after parturition) and mature lactation (milk) stage (MLS; day 15) were chosen for comparison. An ELS-specific cDNA library was established by suppression subtractive hybridization and 25 expressed sequence tags at ELS were identified by sequencing and alignment. To further confirm our results the expression levels of 21 genes during the lactation cycle were measured using quantitative real-time RT-PCR (qRT-PCR). The qRT-PCR results confirmed 9 significantly up-regulated genes at ELS vs. MLS in yak mammary tissue, in which thel-amino acid oxidase 1 (LAO1) and collagen, type I, alpha I (COL1A1) were the most significantly up-regulated. During the lactation cycle, the highest expression of some milk fat genes (i.e.,XDHandFABP3) in yak mammary tissue appears earlier than that in dairy cow. Our data also indicateMYCpotentially playing a central role through putative regulation ofCOL1A1,CD44,SPARC,FASNandGPAM.
Europe on the Sava: Austrian Encounters with “Turks” in Bosnia
Authors: Healy Maureen 
Published: March 2020

AbstractThis article examines Austrian perceptions of the people and landscape of Bosnia-Herzegovina from 1878 to 1908. It traces Austrians’ fantasies about and encounters with Bosnian Muslims, whom they often categorized as “Turks.” Following the Congress of Berlin, Austrians claimed to be doing the civilizing work of “Europe” in Bosnia. The article investigates the meanings of border and borderlands between the Habsburg Empire and Ottoman Bosnia, focusing in particular on crossings of the Sava River. Drawing on the writings of soldiers, administrators, journalists and travel writers, the essay considers a number of mental maps, imagined geographies of what Habsburg authors thought they knew about the land and people they occupied. It contributes to a growing scholarship on the Habsburg-Ottoman borderlands.