bluuebunny/crossref_metadata_2025_split huggingface dataset:
Artificial two-dimensional polar metal by charge transfer to a ferroelectric insulator
Authors: Zhou W. X. , Wu H. J. , Zhou J. , Zeng S. W. , Li C. J. , Li M. S. , Guo R. , Xiao J. X. , Huang Z. , Lv W. M. , Han K. , Yang P. , Li C. G. , Lim Z. S. , Wang H. , Zhang Y. , Chua S. J. , Zeng K. Y. , Venkatesan T. , Chen J. S. , Feng Y. P. , Pennycook S. J. , Ariando A. 
Published: October 2019

AbstractIntegrating multiple properties in a single system is crucial for the continuous developments in electronic devices. However, some physical properties are mutually exclusive in nature. Here, we report the coexistence of two seemingly mutually exclusive properties-polarity and two-dimensional conductivity-in ferroelectric Ba0.2Sr0.8TiO3 thin films at the LaAlO3/Ba0.2Sr0.8TiO3 interface at room temperature. The polarity of a ∼3.2 nm Ba0.2Sr0.8TiO3 thin film is preserved with a two-dimensional mobile carrier density of ∼0.05 electron per unit cell. We show that the electronic reconstruction resulting from the competition between the built-in electric field of LaAlO3 and the polarization of Ba0.2Sr0.8TiO3 is responsible for this unusual two-dimensional conducting polar phase. The general concept of exploiting mutually exclusive properties at oxide interfaces via electronic reconstruction may be applicable to other strongly-correlated oxide interfaces, thus opening windows to new functional nanoscale materials for applications in novel nanoelectronics.
TESS first look at evolved compact pulsators
Authors: Bell Keaton J. , Córsico Alejandro H. , Bischoff-Kim Agnès , Althaus Leandro G. , Bradley Paul A. , Calcaferro Leila M. , Montgomery Michael H. , Uzundag Murat , Baran Andrzej S. , Bognár Zsófia , Charpinet Stéphane , Ghasemi Hamed , Hermes J. J. 
Published: October 2019

Context.Pulsation frequencies reveal the interior structures of white dwarf stars, shedding light on the properties of these compact objects that represent the final evolutionary stage of most stars. Two-minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS) records pulsation signatures from bright white dwarfs over the entire sky.Aims.As part of a series of first-light papers from TESS Asteroseismic Science Consortium Working Group 8, we aim to demonstrate the sensitivity of TESS data, by measuring pulsations of helium-atmosphere white dwarfs in the DBV instability strip, and what asteroseismic analysis of these measurements can reveal about their stellar structures. We present a case study of the pulsating DBV WD 0158−160 that was observed as TIC 257459955 with the two-minute cadence for 20.3 days in TESS Sector 3.Methods.We measured the frequencies of variability of TIC 257459955 with an iterative periodogram and prewhitening procedure. The measured frequencies were compared to calculations from two sets of white dwarf models to constrain the stellar parameters: the fully evolutionary models fromLPCODEand the structural models fromWDEC.Results.We detected and measured the frequencies of nine pulsation modes and eleven combination frequencies of WD 0158−160 to ∼0.01 μHz precision. Most, if not all, of the observed pulsations belong to an incomplete sequence of dipole (ℓ = 1) modes with a mean period spacing of 38.1 ± 1.0 s. The global best-fit seismic models from bothLPCODEandWDEChave effective temperatures that are ≳3000 K hotter than archival spectroscopic values of 24 100–25 500 K; however, cooler secondary solutions are found that are consistent with both the spectroscopic effective temperature and distance constraints fromGaiaastrometry.Conclusions.Our results demonstrate the value of the TESS data for DBV white dwarf asteroseismology. The extent of the short-cadence photometry enables reliably accurate and extremely precise pulsation frequency measurements. Similar subsets of both theLPCODEandWDECmodels show good agreement with these measurements, supporting that the asteroseismic interpretation of DBV observations from TESS is not dominated by the set of models used. However, given the sensitivity of the observed set of pulsation modes to the stellar structure, external constraints from spectroscopy and/or astrometry are needed to identify the best seismic solutions.
Planet and star synergy at high-spectral resolution. A rationale for the characterization of exoplanet atmospheres
Authors: Chiavassa A. , Brogi M. 
Published: October 2019

Context. Spectroscopy of exoplanet atmospheres at high-resolving powers is rapidly gaining popularity for measuring the presence of atomic and molecular species. While this technique is particularly robust against contaminant absorption in the Earth’s atmosphere, the non-stationary stellar spectrum, in the form of either Doppler shift or distortion of the line profile during planetary transits, creates a non-negligible source of noise that can alter or even prevent detection.
Aims. Our aim was to use state-of-the art three-dimensional stellar simulations to directly remove the signature of the star from observations prior to cross correlation with templates for the planet’s atmosphere, which are commonly used to extract the faint exoplanet signal from noisy data.
Methods. We computed synthetic spectra from 3D simulations of stellar convection resolved both spatially and temporally, and we coupled them with an analytical model reproducing the correct geometry of a transiting exoplanet. We applied the method to the early K-dwarf, HD 189733, and re-analyzed transmission and emission spectroscopy of its hosted exoplanet. In addition, we also analyzed emission spectroscopy of the non transiting exoplanet 51 Pegasi b, orbiting a solar-type star.
Results. We find a significant improvement in planet detectability when removing the stellar spectrum with our method. In all cases, we show that the method is superior to a simple parametrisation of the stellar line profile or to the use of 1D stellar models. We show that this is due to the intrinsic treatment of convection in 3D simulations, which allows us to correctly reproduce asymmetric and blue-shifted spectral lines, and intrinsically model center-to-limb variation and Rossiter-McLaughlin effect potentially altering the interpretation of exoplanet transmission spectra. In the case of 51 Pegasi b, we succeed in confirming a previous tentative detection of the planet’s K-band spectrum due to the improved suppression of stellar residuals.
Conclusions. Future high-resolution observations will benefit from the synergy with stellar spectroscopy and can be used to test the correct modeling of physical processes in stellar atmospheres. We highlight key improvements in modeling techniques and knowledge of opacity sources to extend this work to shorter wavelengths and later-type stars.
Approximate solutions for the Bagley-Torvik fractional equation with boundary conditions using the Polynomial Least Squares Method
Authors: Pasca Madalina Sofia , Razzaghi Mohsen , Lapadat Maria 
Published: October 2019

In this paper we apply the recently introduced Polynomial Least Squares Method (PLSM) to compute approximate analyticalpolynomial solutions for the Bagley-Torvik fractional equation with boundary conditions.
The Bagley—Torvik equation may be used to model the motion of real physical systems such as the motion of a thin rigid plate immersed in a Newtonian fluid. In order to emphasize the accuracy of PLSM, we included a comparison with previous approximate solutions obtained for the Bagley-Torvik fractional equation by means of other approximation method.
Plastic deformation simulation of steel panels
Authors: Savin Mihaela , Presura Adrian , Chirica Ionel 
Published: October 2019

This paper presents the FEM analysis of plastic deformation of different steel panels using a spherical indenter. Two experiments were done: first on a simple steel panel and second on a stiffened steel panel, which were subjected to a static plastic deformation produced with help of a spherical indenter. The results of the practical test were compared with the results of numerical simulations, which were accomplished using ANSYS-Static Structural module.
The tests were realized using an experimental stand based on a screw press mechanism. The tests consist in vertical displacement of the spherical bulb, which in this way deformed the panel leaning on the stand frame. During the tests were measured the force applied to the indenter, with help of an PLC500 force transducer, and the vertical displacement of the panel in the application point of force, with help of an HBM WA/300 displacement transducer.
The results of calculations are presented below as: final deformed models and force-displacement diagrams with the comparison between experiment and numerical simulation.
In conclusion of this research the compared results between the experiments and numerical simulations revealed that can be achieved accurate results using FEM analysis for plastic deformation problems, with proper parameters settings.
Blutdruckmessung
Authors: Middeke Martin 
Published: October 2019

ZusammenfassungDie korrekte Blutdruckmessung zur richtigen Zeit ist nicht nur Grundlage für die Diagnose Hypertonie, sondern kann bereits weitere Aufschlüsse geben über Ursachen und Formen der Hypertonie, Endorganschäden und Risiken. Die verschiedenen Messverfahren ergänzen sich in sinnvoller Weise und haben jeweils bestimmte Vor- und Nachteile.
Isolierte systolische Hypertonie (ISH) – Alt gegen Jung
Authors: Middeke Martin 
Published: October 2019

ZusammenfassungDie isolierte systolische Hypertonie (ISH) ist definiert als erhöhter systolischer Blutdruck (BD) mit normalen oder niedrigen diastolischen Werten: > 140/< 90 mmHg bei der konventionellen Blutdruckmessung am Oberarm. Lange bekannt ist die ISH als typische Hochdruckform im Alter. Die Bedeutung der systolischen Blutdruckerhöhung bei juveniler Hypertonie hat dagegen erst in letzter Zeit Aufmerksamkeit bekommen. Dank neuer Messverfahren ist eine bessere Differenzierung der beiden sehr verschiedenen Hochdruckformen möglich. Eine große Blutdruckamplitude im Alter ist Ausdruck eines fortgeschrittenen arteriellen Gefäßschadens und bei Jungen Ausdruck einer besonders guten Prognose. Dementsprechend muss die ISH im Alter behandelt werden und bei den Jungen nicht.
Ernährung und Fasten bei chronisch entzündlichen Gelenkerkrankungen
Authors: Michalsen Andreas , Stange Rainer 
Published: October 2019

ZusammenfassungEs existieren prinzipielle Ernährungskonzepte mit grundlegender Plausibilität, die Entzündungen hemmen können. Therapeutisches Fasten dürfte derzeit die am häufigsten ausgegebene und praktizierte Empfehlung sein. Über die vegetarische oder vegane Kostform berichten viele Patienten Besserung und es gibt hierzu eine wachsende Evidenz.Die Ernährungskonzepte, entstanden aus naturheilkundlichen Traditionen und neueren Entwicklungen, lassen sich grundsätzlich charakterisieren durch ihre Elemente: vornehmlich Frischkost, zuckerarm bzw. zuckerfrei, pflanzenbasiert, wenig tierische Proteine sowie günstige Fettsäuren. Beispiele dafür sind die mediterrane Kost, aber auch vegetarische Kostformen, die auf tierische Proteine weitgehend verzichten.
Management – medikamentöse und nicht-medikamentöse Therapie der axialen Spondyloarthritis
Authors: Sieper Joachim , Braun Jürgen 
Published: October 2019

ZusammenfassungDer Begriff axiale Spondyloarthritis umfasst sowohl Patienten mit schon vorhandenen Röntgenveränderungen in den Sakroiliakalgelenken oder der Wirbelsäule als auch Patienten in der früheren rein entzündlichen Phase ohne strukturelle Knochenveränderungen. Die Grundlagen der Therapie sind physikalische Therapie und nicht-steroidale Antirheumatika, konventionelle DMARDs spielen im therapeutischen Vorgehen keine Rolle. Die klinische Krankheitsaktivität wird gemessen mit zusammengesetzten Scores, dem BASDAI und dem ASDAS, wobei letzterer außer ‚patient reported outcome‘ – Parametern auch das CRP enthält. Sind Patienten weiterhin aktiv trotz konventioneller Therapie, kommen Biologika zum Einsatz, TNF-Blocker oder IL-17-Inhibitoren. Im Gegensatz zu anderen chronisch-entzündlichen Erkrankungen haben sich andere bisher getestete Biologika als ineffektiv erwiesen, JAK-Inhibitoren könnten eine weitere Therapiemöglichkeit für die Zukunft darstellen. Zur Zeit lässt sich nicht voraussagen, welche axSpA Patienten auf welches Biologikum besser ansprechen.
Factors Associated with Attempted External Cephalic Version for Fetal Malpresentation at Term
Authors: Limaye Meghana , Abdullahi Najma , Has Phinnara , Danilack Valery A. , Froehlich Rosemary , Werner Erika 
Published: October 2019

Objective To assess differences in patient characteristics between women who did and did not undergo attempted external cephalic version (ECV) for fetal malpresentation at term.
Study Design This was a retrospective cohort study of women with a singleton gestation and noncephalic presentation at > 37.0 weeks between October 2014 and October 2015. We compared demographic and clinical characteristics of women who did and did not undergo attempted ECV and assessed the reasons that women did not attempt ECV.
Results Among 215 women, only 51 (24%) attempted ECV. There were no differences in age, race, insurance type, or body mass index between women who underwent attempted ECV and those who did not. Women who underwent ECV were significantly more likely to have had a prior vaginal delivery (69 vs. 36%, p < 0.001). Seventy-six women (46%) declined ECV. Women who declined ECV were more likely to be nulliparous than those who accepted the procedure (66 vs. 29%, p < 0.001). Among women who had ECV, the success rate was 55%. There were no adverse events after attempted ECV in this cohort.
Conclusion Among women with fetal malpresentation at term, those without a prior vaginal delivery were significantly less likely to undergo attempted ECV.
Effects of Light Curing Method and Exposure Time on Mechanical Properties of Resin Based Dental Materials
Authors: Alpöz A. Rıza , Ertuḡrul Fahinur , Cogulu Dilsah , Ak Aslı Topaloḡlu , Tanoḡlu Metin , Kaya Elçin 
Published: October 2019

ABSTRACTObjectives: The aim of this study was to investigate microhardness and compressive strength of composite resin (Tetric-Ceram, Ivoclar Vivadent), compomer (Compoglass, Ivoclar, Vivadent), and resin modified glass ionomer cement (Fuji II LC, GC Corp) polymerized using halogen light (Optilux 501, Demetron, Kerr) and LED (Bluephase C5, Ivoclar Vivadent) for different curing times.Methods: Samples were placed in disc shaped plastic molds with uniform size of 5 mm diameter and 2 mm in thickness for surface microhardness test and placed in a diameter of 4 mm and a length of 2 mm teflon cylinders for compressive strength test. For each subgroup, 20 samples for microhardness (n=180) and 5 samples for compressive strength were prepared (n=45). In group 1, samples were polymerized using halogen light source for 40 seconds; in group 2 and 3 samples were polymerized using LED light source for 20 seconds and 40 seconds respectively. All data were analyzed by two way analysis of ANOVA and Tukey’s post-hoc tests.Results: Same exposure time of 40 seconds with a low intensity LED was found similar or more efficient than a high intensity halogen light unit (P>.05), however application of LED for 20 seconds was found less efficient than 40 seconds curing time (P=.03).Conclusions: It is important to increase the light curing time and use appropriate light curing devices to polymerize resin composite in deep cavities to maximize the hardness and compressive strength of restorative materials. (Eur J Dent 2008;2:37-42)
Cuspal movement related to different bonding techniques using etch-and-rinse and self-etch adhesive systems
Authors: Campos Edson Alves , Andrade Marcelo Ferrarezi , Porto-Neto Sizenando Toledo , Campos Lucas Arrais , Cury Saad José Roberto , Deliberador Tatiana Miranda , Oliveira-Júnior Osmir Batista 
Published: October 2019

ABSTRACTObjectives: To investigate the effects of adhesion technique using different contemporary adhesive systems on the cuspal movement in class II composite restorations in human premolar teeth.Methods: Human premolar teeth were prepared with class II cavities and then restored with composite and etch-and-rinse (Adper Scotchbond Multi Purpose and Adper Single Bond) or selfetch (Clearfil SE Bond and Clearfil S3 Bond) adhesive systems under different bonding techniques (total bonding and selective bonding). The influence of an intermediate layer of flowable composite was also evaluated. The cuspal distance was measured before and after the restorative procedure, and the difference was recorded as cuspal movement. The data were submitted to ANOVA test and Tukey’s post hoc comparison procedure test (alpha=0.05).Results: For all adhesive systems, the teeth restored with selective bonding technique showed lower values of cuspal movement and the use of an intermediary layer of flowable composite did not show any influence on the cuspal movement.Conclusions: Both the adhesive techniques tested were not able to prevent the cuspal movement. However, selectively bonded class II composite restorations demonstrated lower values of cuspal movement comparing with total bonding technique, and the use of an intermediate layer of flowable composite did not diminish the values of cuspal movement. (Eur J Dent 2009;3:213-218)
Venous Thromboembolism in Patients with Liver Cirrhosis: Findings from the RIETE (Registro Informatizado de la Enfermedad TromboEmbolica) Registry
Authors: Bikdeli Behnood , Jiménez David , Garcia-Tsao Guadalupe , Barba Raquel , Font Carme , Díaz-Pedroche María del Carmen , Mazzolai Lucia , Little Derek Henry Wallace , Tufano Antonella , Tafur Alfonso J. , Siegal Deborah , Lip Gregory Y.H. , Monreal Manuel ,   for the RIETE Investigators
Published: October 2019

AbstractPatients with cirrhosis are not only at an increased risk of bleeding but also at risk of venous thromboembolism (VTE). We sought to determine the clinical characteristics, management, and outcomes after VTE in patients with cirrhosis. We used the data from RIETE (Registro Informatizado de la Enfermedad TromboEmbolica), an international registry of patients with VTE, to compare the outcomes in patients with and without cirrhosis. Main outcomes included all-cause mortality, pulmonary embolism (PE)-related mortality, recurrent VTE, and bleeding. Among 43,611 patients with acute VTE, 187 (0.4%) had cirrhosis. Of these, 184 (98.4%) received anticoagulation for a median of 109 days (interquartile range [IQR]: 43–201 days), most commonly with enoxaparin (median dose: 1.77 [IQR: 1.38–2.00] mg/kg/day). Compared with patients without cirrhosis, those with cirrhosis had a higher rate of all-cause mortality (10.7 vs. 3.4%; odds ratio [OR]: 3.41; 95% confidence interval [CI]: 2.03–5.46) and fatal bleeding (2.1 vs. 0.2%; OR: 13.94; 95% CI: 3.65–37.90) but similar rates of fatal PE (0.5 vs. 0.5%; OR: 1.17; 95% CI: 0.03–6.70). Patients with cirrhosis had a higher rate of all-cause mortality per 100 patient-years of follow-up (58.9 vs. 16.0; hazard ratio [HR]: 3.70; 95% CI: 2.69–4.91). One-year hazard ratio of clinically relevant bleeding (HR: 2.86; 95% CI: 1.91–4.27), fatal bleeding (HR: 8.51; 95% CI: 3.5–20.7), or recurrent VTE (HR: 2.08; 95% CI: 1.00–4.36) was higher in patients with cirrhosis. Cirrhosis is a challenging comorbidity in patients with VTE. Most patients were treated with anticoagulation and had an elevated risk of recurrence, similar risk of fatal PE, and a very high risk of bleeding including fatal bleeds.
Cytotoxicity evaluation of self-etching dentine bonding agents in a cell culture perfusion condition
Authors: Korsuwannawong Suwanna , Srichan Ratchaporn , Vajrabhaya La-ongthong 
Published: October 2019

ABSTRACTObjective: The aim of this study was to evaluate the cytotoxicity of three dentine bonding agents (G-Bond, Clearfil S3 Bond and Clearfil SE Bond X) in cell-culture perfusion.Methods: In this experiment, 8x104 TCPC SV40 cells (bovine-pulp-derived cells transfected with simian virus 40 large T-antigen) in MEM-alpha media, 20%FCS were seeded on mesh in a 6-well plate and incubated at 37 °C with 5% CO2. After 2 days, the mesh inserts were transferred to a 24-well plate and incubated in MEM-alpha media, 20%FCS with 50 μg/ml of ascorbic acid at 37 °C with 5% CO2 for 14 days. The test materials were applied to the dentine discs of dentine barrier models. Three-dimensional cell cultures in mesh and perfusion conditions were generated in this experiment. Each material, as well as the negative control (President) and the positive control (vitrebond), was tested in 5 models with the tests repeated in triplicate. The MTT assay was used to determine cell viability after the diffusion of leachable toxicity from the tested materials through the dentine discs.Results: The cell survival rate with G-Bond and Clearfil S3 Bond was 113.03 and 90.98 percent, respectively, whereas that with Clearfil SE Bond X was 111.83 percent. All three dentine bonding agents had no toxicity compared with the negative control group (P>.05).Conclusions: All three self-etching dentine-bondingagents are nontoxic. Pulp damage caused by these three bonding agents is unlikely to occur in the clinic. (Eur J Dent 2012;6:408-414)
The relationship between dental health behavior, oral hygiene and gingival status of dental students in the United Arab Emirates
Authors: Rahman Betul , Kawas Sausan Al 
Published: October 2019

ABSTRACTObjective: The purpose of this study is to assess the impact of knowledge acquired in preventive aspects of dental education on dental students’ own health attitudes, oral hygiene and gingival status in the United Arab Emirates.Methods: To compare the self-reported oral health behavior of first year dental students in the University of Sharjah with their actual oral hygiene and gingival conditions, 93 volunteers who participated in the study completed the Hiroshima University-Dental Behavioral Inventory (HU-DBI) questionnaire. Subsequently a clinical examination for their Plaque Scores (Modified Quigley Hein Plaque Index) and Gingival Bleeding Index was performed by a calibrated dentist.Results: 29% of the participants reported bleeding gums; 83% were concerned by the color of their gums while 63% reported that it was impossible to prevent gum disease with brushing alone; and only 10% noticed some sticky white deposits on their teeth. However, approximately 92% were not in agreement that they would have false teeth when they grew older. 56% mentioned that they used dental floss regularly and 86% brushed twice daily or more. Male students had higher bleeding and plaque scores than female students. There appeared to be a significant relationship between plaque scores and HU-DBI responses; in addition to the significant relationship noted between recorded bleeding percentages and HU-DBI responses.Conclusion: Female students have shown better dental care behavior than male students. The dental students with better self-reported oral health attitudes were expected to have lower plaque scores but instead had moderate plaque and gingival bleeding scores. This indicates the need for more emphasis on preventive measures in oral health education. (Eur J Dent 2013;7:22-27)