bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparing Robot and Human guided Personalization: Adaptive Exercise Robots are Perceived as more Competent and Trustworthy
Authors: Schneider Sebastian , Kummert Franz 
Published: February 2020

AbstractLearning and matching a user’s preference is an essential aspect of achieving a productive collaboration in long-term Human–Robot Interaction (HRI). However, there are different techniques on how to match the behavior of a robot to a user’s preference. The robot can beadaptableso that a user can change the robot’s behavior to one’s need, or the robot can beadaptiveand autonomously tries to match its behavior to the user’s preference. Both types might decrease the gap between a user’s preference and the actual system behavior. However, the Level of Automation (LoA) of the robot is different between both methods. Either the user controls the interaction, or the robot is in control. We present a study on the effects of different LoAs of a Socially Assistive Robot (SAR) on a user’s evaluation of the system in an exercising scenario. We implemented an online preference learning system and a user-adaptable system. We conducted a between-subject design study (adaptablerobot vs. adaptiverobot) with 40 subjects and report our quantitative and qualitative results. The results show that users evaluate theadaptiverobots as more competent, warm, and report a higher alliance. Moreover, this increased alliance is significantly mediated by the perceived competence of the system. This result provides empirical evidence for the relation between the LoA of a system, the user’s perceived competence of the system, and the perceived alliance with it. Additionally, we provide evidence for a proof-of-concept that the chosen preference learning method (i.e., Double Thompson Sampling (DTS)) is suitable for online HRI.
Train energy simulation with locomotive adhesion model
Authors: Wu Qing , Spiryagin Maksym , Cole Colin 
Published: February 2020

AbstractRailway train energy simulation is an important and popular research topic. Locomotive traction force simulations are a fundamental part of such research. Conventional energy calculation models are not able to consider locomotive wheel–rail adhesions, traction adhesion control, and locomotive dynamics. This paper has developed two models to fill this research gap. The first model uses a 2D locomotive model with 27 degrees of freedom and a simplified wheel–rail contact model. The second model uses a 3D locomotive model with 54 degrees of freedom and a fully detailed wheel–rail contact model. Both models were integrated into a longitudinal train dynamics model with the consideration of locomotive adhesion control. Energy consumption simulations using a conventional model (1D model) and the two new models (2D and 3D models) were conducted and compared. The results show that, due to the consideration of wheel–rail adhesion model and traction control in the 3D model, it reports less energy consumption than the 1D model. The maximum difference in energy consumption rate between the 3D model and the 1D model was 12.5%. Due to the consideration of multiple wheel–rail contact points in the 3D model, it reports higher energy consumption than the 2D model. An 8.6% maximum difference in energy consumption rate between the 3D model and the 1D model was reported during curve negotiation.
Developmental trajectory of purpose identification during adolescence: Links to life satisfaction and depressive symptoms
Authors: Chen Hung‐Yang , Cheng Ching‐Ling 
Published: February 2020

ABSTRACTIntroductionWhereas evidence has shown that a sense of purpose is linked to optimal adjustment, longitudinal work investigating the development of purpose identification as well as its effect on psychological functioning among non‐Western samples during adolescence is needed.MethodsThree hundred and eighty‐seven senior high school students (253 female, 65.37%; mean age = 15.76 years at the first investigation) from Taiwan completed surveys four times beginning in the fall of tenth grade and ending in the spring of eleventh grade with a six‐month interval. Using self‐ratings, purpose identification was evaluated in all four assessments and psychological functioning was examined through life satisfaction and depressive symptoms in the first and the last survey.ResultsGrowth curve analyses revealed an increased slope in purpose identification over the first two years of high school, and such a trajectory was similar across boys and girls. Additionally, increases in purpose identification predicted enhanced life satisfaction and reduced depressive symptoms among both boys and girls. There was only one gender difference: The negative association between purpose identification trajectory and depressive symptoms was stronger for girls than for boys.ConclusionsThere is an increase in the development of identified purpose during middle adolescence among high school students in Taiwan. Such change not only promotes life satisfaction in adolescents but is also preventive of adolescent depression. As such, the current findings highlight the significance for adolescents to discover and commit to a purpose.
Time to Orgasm in Women in a Monogamous Stable Heterosexual Relationship
Authors: Bhat Gajanan S. , Shastry Anuradha 
Published: February 2020

AbstractBackgroundOrgasm in women is a complex phenomenon, and the sparse data about time to orgasm (TitOr) in women are an impediment to the research on this complex phenomenon.AimTo evaluate the stopwatch measured TitOr in women in a monogamous stable heterosexual relationship.MethodsThe study was conducted through web-based and personal interview using a questionnaire, which addressed the issues related to TitOr. Sexually active women older than 18 years and women in a monogamous stable heterosexual relationship were included in the study. Those with comorbidities such as diabetes, hypertension, asthma, psychiatric illness, sexual dysfunction and those with partners with sexual dysfunction were excluded. The participants reported stopwatch measured TitOr after adequate sexual arousal over an 8-week period. The data analysis was performed using GraphPad software (©2018 GraphPad Software, Inc, USA).OutcomesThe outcomes included stopwatch measured average TitOr in women.ResultsThe study period was from October 2017 to September 2018 with a sample size of 645. The mean age of the participants was 30.56 ± 9.36 years. The sample was drawn from 20 countries, with most participants from India, the United Kingdom, the Netherlands, and the United States of America. The mean reported TitOr was 13.41 ± 7.67 minutes (95% confidence interval: 12.76 minutes–14.06 minutes). 17% of the participants had never experienced the orgasm. Penovaginal intercourse was insufficient to reach orgasm in the majority, in whom it was facilitated by certain positions and maneuvers.Clinical ImplicationsThe knowledge of stopwatch measured TitOr in women in real-life setting helps to define, treat, and understand female sexual function/dysfunction better and it also helps to plan treatment of male ejaculatory dysfunction, as reported ejaculatory latency in healthy men is much less than the reported TitOr here.Strengths & limitationsUse of stopwatch to measure TitOr and a large multinational sample are the strength of the study. The absence of a crosscheck mechanism to check the accuracy of the stopwatch measurement is the limitation of the study.ConclusionStopwatch measured average TitOr in the sample of women in our study, who were in a monogamous stable heterosexual relationship, is 13.41 minutes (95% confidence interval: 12.76 minutes–14.06 minutes) and certain maneuvers as well as positions during penovaginal intercourse help achieving orgasm, more often than not.
Space Weather Challenge and Forecasting Implications of Rossby Waves
Authors: Dikpati Mausumi , McIntosh Scott W. 
Published: February 2020

AbstractRossby waves arise in thin layers within fluid regions of stars and planets. These global wave‐like patterns occur due to the variation in Coriolis forces with latitude. In the past several years observational evidence has indicated that there are also Rossby waves in the Sun. Although Rossby waves have been detected in the Sun's photosphere and corona, they most likely originate in the solar tachocline, the sharp shear layer at the base of the solar convection zone, where the differential rotation driven by convection transitions to the solidly rotating radiative interior. These waves differ from their Earth's counterparts by being strongly modified by toroidal magnetic fields in the solar tachocline. Recent simulations of magnetohydrodynamics of tachocline Rossby waves and magnetic fields are demonstrated to produce strong “tachocline nonlinear oscillations,” which have periods similar to those observed in the solar atmosphere—enhanced periods of solar activity, or “seasons”—occurring at intervals between six months and two years. These seasonal/subseasonal bursts produce the strongest eruptive space weather events. Thus, a key to forecasting the timing, amplitude, and location of future activity bursts, and hence space weather events, could lie in our ability to forecast the phase and amplitude of Rossby waves and associated tachocline nonlinear oscillations. Accurately forecasting the properties of solar Rossby waves and their impact on space weather will require linking surface activity observations to the magnetohydrodynamics of tachocline Rossby waves, using modern data assimilation techniques. Both short‐term (hours to days) and long‐term (decadal to millennial) forecasts of space weather and climate are now being made. We highlight in this article the potential of solar Rossby waves for forecasting space weather on intermediate time scales, of several weeks to months up to a few years ahead.
Separating Geometry‐ From Stress‐Induced Remanent Magnetization in Magnetite With Ilmenite Lamellae From the Stardalur Basalts, Iceland
Authors: ter Maat G. W. , Fabian K. , Church N. S. , McEnroe S. A. 
Published: February 2020

AbstractRealistic geometries of magnetite grains from the Stardalur volcano, Iceland, were obtained by Focused Ion Beam Scanning Electron Microscopy nanotomography. These magnetite grains are subdivided by oxidation‐exsolution lamellae of ilmenite. Magnetic properties of these grains were modeled without internal stress using the three‐dimensional micromagnetic code MERRILL. The influence of grain shape and size was isolated by modeling hysteresis loops of the same grains with and without exsolution microstructures. The resulting coercivities Hc are up to 1.5 times higher, and the Mrs/Ms ratios are twice as high for the grains with exsolution than for those without. Both modeled values are a factor of 10 smaller than the measured bulk data from the same sample. This difference between stress‐free models and measured hysteresis loops suggests that the internal stress due to the formation of the oxidation‐exsolution lamellae is the dominant mechanism of coercivity and remanence enhancement. By comparing the approach‐to‐saturation behavior of modeled and measured hysteresis loops, the internal stress is quantified to about 100 MPa. The formation of lamellae has two effects on magnetic properties. (1) The apparent grain size is geometrically reduced. This effect increases Mrs and Hc by up to a factor of 2. (2) The formation of lamellae produces internal stress fields, which provide additional anisotropy energy that deflect the magnetic spins and apparently increase Mrs and Hc by up to a factor of 10. Accordingly, stress dominates the remanent magnetic properties in the Stardalur basalts and may be the decisive effect explaining its unusual remanent‐dominated ground magnetic anomaly of up to 27,000 nT.
Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations
Authors: Claudepierre S. G. , Ma Q. , Bortnik J. , O'Brien T. P. , Fennell J. F. , Blake J. B. 
Published: February 2020

AbstractWe use measurements from NASA's Van Allen Probes to calculate the decay time constants for electrons over a wide range of energies (30 keV to 4 MeV) and
values (
= 1.3–6.0) in the Earth's radiation belts. Using an automated routine to identify flux decay events, we construct a large database of lifetimes for near‐equatorially mirroring electrons over a 5‐year interval. We provide the first accurate estimates of the long decay timescales in the inner zone (
100 days), which are highly resolved in energy and free from proton contamination. In the slot region and outer zone, we compare our lifetime calculations with prior empirical estimates and find good quantitative agreement (lifetimes
1–20 days). The comparisons suggest that some prior estimates may overestimate electron lifetimes between
2.5–4.5 due to instrumental effects and/or background contamination. Previously reported two‐stage decays are explicitly demonstrated to be a consequence of using integral fluxes.
Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory
Authors: Claudepierre S. G. , Ma Q. , Bortnik J. , O'Brien T. P. , Fennell J. F. , Blake J. B. 
Published: February 2020

AbstractWe compute quasilinear diffusion rates due to pitch angle scattering by various mechanisms in the Earth's electron radiation belts. The calculated theoretical lifetimes are compared with observed decay rates, and we find excellent qualitative agreement between the two. The overall structure of the observed lifetime profiles as a function of energy and
is largely due to plasmaspheric hiss and Coulomb scattering. The results also reveal a local minimum in lifetimes in the inner zone at lower energy (
50 keV), attributed to enhanced scattering via ground‐based very low frequency transmitters, and a reduction in lifetimes at higher
and energy (
1 MeV), attributed to enhanced electromagnetic ion cyclotron wave scattering. In addition, we find significant quantitative disagreement at
, where the theoretical lifetimes are typically a factor of
10 larger than the observed, pointing to an additional loss process that is missing from current models. We discuss potential factors that could contribute to this disagreement.
Three‐Dimensional Mapping of Mt. Ruapehu Volcano, New Zealand, From Aeromagnetic Data Inversion and Hyperspectral Imaging
Authors: Miller C. A. , Schaefer L. N. , Kereszturi G. , Fournier D. 
Published: February 2020

AbstractCombining 3‐D inversion of high‐resolution aeromagnetic data with airborne hyperspectral imaging creates a new method to map buried structure and hydrothermal alteration, applied to Mt. Ruapehu volcano, New Zealand. Hyperspectral imaging is sensitive to surface mineralogy including alteration minerals, while magnetic vector inversion reveals the volumetric distribution of magnetic susceptibility from which we interpret buried geology. Probability assessment from multiple model regularizations provides an important model uncertainty estimate. At Ruapehu, hyperspectral imaging highlights two main regions of surface alteration: the Pinnacle Ridge and the southeast flanks. The magnetic model of Pinnacle Ridge shows that alteration seen at surface continues to depth, but strongly magnetic, unaltered dikes form the core of the ridge. On the southeast flanks, the magnetic model also shows alteration imaged on the surface continues to depth; however, a previously unknown, magnetized sill intrudes part of the flank. Several smaller demagnetized regions are modeled, unlike at neighboring Mt. Tongariro where the hydrothermal system created a large demagnetized core. We propose that these differences relate to spatially focused (Ruapehu) vs distributed (Tongariro) eruption vents, the degree of faulting of the edifice and its glaciation history. Lava‐ice interaction produces fine‐grained lavas with measured magnetic susceptibilities similar to some moderately altered lavas, illustrating that care must be taken in the interpretation of magnetic data in the absence of geological information. The combination of hyperspectral imaging and aeromagnetic data inversion distinguishes shallow surface weathering from deeper‐seated hydrothermally altered rock masses, with implications for the magnitude and probability of collapse events.
CO2 Induced a Small Water Solubility in Orthopyroxene and Its Implications for Water Storage in the Upper Mantle
Authors: Guo Xinzhuan , Bai Jiayuan , Wang Chao , Wu Xiang , Zhou Xingfan 
Published: February 2020

AbstractTo investigate the effect of CO2 on water solubility in orthopyroxene coexisting with H2O‐CO2 as a buffering fluid, high‐pressure experiments were conducted at pressures of 1.5 and 3 GPa and a temperature of 1100 °C. The experiments were performed in a Walker‐type multianvil assembly using natural orthopyroxene with various CO2 to CO2‐H2O molar ratios as a starting material. The water contents were measured by polarized Fourier transform infrared spectrometry. At 1.5 GPa and 1100 °C, the H2O solubility decreased with increasing CO2 content in the fluid. The water solubility c(H2O) could be quantitatively determined based on water fugacity f(H2O) as c(H2O) = 25.21 × f(H2O)1.24. The addition of 57% CO2 dramatically reduced the water solubility in orthopyroxene from 184 to 90 ppm. In contrast, at 3 GPa and 1100 °C, the water solubility did not change with the CO2 content in the starting material because CO2 is unstable in bulk peridotite due to the reaction between CO2 and olivine at pressures exceeding 2.2 GPa. This study confirms that the additional component in the aqueous fluid can change the water activity and fugacity, thereby directly lowering the water storage capacity in mantle minerals. As a result, previous estimates of the maximum water storage capacity in the shallow mantle may be overestimated by a factor of 3.
Estimation of Leaf Photosynthetic Capacity From Leaf Chlorophyll Content and Leaf Age in a Subtropical Evergreen Coniferous Plantation
Authors: Wang Shaoqiang , Li Yue , Ju Weimin , Chen Bin , Chen Jinghua , Croft Holly , Mickler Robert A. , Yang Fengting 
Published: February 2020

AbstractPhotosynthetic rate is a key source of uncertainty in the modeling of the terrestrial carbon cycle. Recent studies have utilized leaf chlorophyll content (Chl) as a proxy for leaf photosynthetic capacity in croplands and deciduous forests, with little investigation into this relationship for other plant function types and for different leaf ages. In this study, we evaluated the relationship between the maximum rate of carboxylation (Vcmax25) and the maximum electron transport capacity (Jcmax25) at 25 °C with both leaf nitrogen and Chl from different leaf ages (current and previous year) in Masson's pine (Pinus massoniana Lamb.) and slash pine (Pinus elliottii Engelm.) species in a subtropical evergreen coniferous forest. Our results showed small changes in leaf nitrogen over the growing season. In contrast, Vcmax25, Jmax25, and Chl displayed larger seasonal variations. Vcmax25 was more related to leaf Chl than leaf nitrogen in both previous year's and current year's leaves, likely due to the variable partitioning of leaf nitrogen between and within photosynthetic and nonphotosynthetic fractions. Leaf Chl and month after budding (MAB) were the main predictors for Vcmax25 based on the random forest regression analysis. These findings highlighted the problem in using leaf nitrogen as a proxy for Vcmax25 where there is a dynamic nitrogen investment (i.e., with leaf ontogenesis, or between different species) and illustrated the value of using leaf Chl (as retrievable from remotely sensing) and MAB to constrain Vcmax25 in process‐based models to improve the simulation of photosynthetic rates in evergreen coniferous forests.
Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?
Authors: Ota Mitsuaki , Mamet Steven D. , Muller Amanda L. , Lamb Eric G. , Dhillon Gurbir , Peak Derek , Siciliano Steven D. 
Published: February 2020

AbstractHigh Arctic polar deserts cover 26% of the Arctic. Increasing temperatures are predicted to significantly alter polar desert freeze‐thaw and biogeochemical cycles, with important implications for greenhouse gas emissions. However, the mechanisms underlying these changing cycles are still highly uncertain. Cryoturbic, carbon‐rich Bhy horizons (diapirs) in frost boils are key nutrient sources for Salix arctica. We hypothesized that diapirism leads to organic carbon characteristics that alter microbial pathways, which then control root foraging and greenhouse gas production. During July and August 2013, we characterized soil properties and examined gross nitrogen transformation rates in frost boils both with and without diapirs in two High Arctic polar deserts (dolomite and granite) near Alexandra Fjord (78°51′N 75°54′W), Ellesmere Island, Nunavut, Canada. Diapiric frost boils had 18% higher soil organic carbon in the dolomitic and 9% higher in the granitic deserts, and 29% higher total dissolved nitrogen in the dolomitic desert. However, diapirs decreased gross nitrogen mineralization rates by 30% in the dolomitic and by 48% in the granitic deserts. Attenuated total reflectance Fourier transformed mid‐infrared spectroscopy revealed greater concentrations of polysaccharides and recalcitrant carbon in diapiric versus nondiapiric frost boils. These increased polysaccharide concentrations likely facilitate diapirism as soil viscosity increases with polysaccharides. Lower microbial activity or ectomycorrhizae that are known to colonize S. arctica may accumulate total dissolved nitrogen in diapirs. Our results suggest geomorphologic‐plant‐microbe interactions may underlie important patterns of geochemical cycling in arctic systems. Thus, polar desert frost boils should represent a key focus of future investigations of climate change in arctic systems.
Phytoplankton Responses to Climate‐Induced Warming and Interdecadal Oscillation in North‐Western Australia
Authors: Yuan Zineng , Liu Dongyan , Masqué Pere , Zhao Meixun , Song Xiuxian , Keesing John K. 
Published: February 2020

AbstractGrowing evidence has suggested that ocean warming could cause a decline in marine phytoplankton productivity. However, studies in tropical waters have discovered that evolutionary adaptation of local species to warming and positive response to increasing rainfall could avoid the sharp decline in productivity. Here, the decadal trends of phytoplankton biomass, reconstructed using the biomarkers of brassicasterol (diatoms) and dinosterol (dinoflagellates), showed a 1.5–3 times increase since the 1950s along a large section of the Kimberley coast, north‐western Australia. Principal component analysis found that 56% of the phytoplankton variance was linked with climate change‐induced increases in sea surface temperature and rainfall associated with increased tropical cyclones, which can enhance nutrient supply favoring phytoplankton growth and production; 20.4% of the phytoplankton variance tended to be related to the Interdecadal Pacific Oscillation through a mechanism of ocean‐coast interaction. We empirically predict that the negative impact of rising temperatures on phytoplankton in north‐western Australia could be buffered by the increasing tropical cyclones and the coming warm phase of Interdecadal Pacific Oscillation.