bluuebunny/crossref_metadata_2025_split huggingface dataset:
A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
Authors: Gebruers Sarah , Straumit Ilya , Tkachenko Andrew , Mombarg Joey S. G. , Pedersen May G. , Van Reeth Timothy , Li Gang , Lampens Patricia , Escorza Ana , Bowman Dominic M. , De Cat Peter , Vermeylen Lore , Bodensteiner Julia , Rix Hans-Walter , Aerts Conny 
Published: April 2021

Context. Asteroseismic modelling of the internal structure of main-sequence stars born with a convective core has so far been based on homogeneous analyses of space photometric Kepler light curves of four years in duration, to which most often incomplete inhomogeneously-deduced spectroscopic information was added to break degeneracies.
Aims. Our goal is twofold: (1) to compose an optimal sample of gravity-mode pulsators observed by the Kepler space telescope for joint asteroseismic and spectroscopic stellar modelling, and (2) to provide spectroscopic parameters for its members, deduced in a homogeneous way.
Methods. We assembled HERMES high-resolution optical spectroscopy at the 1.2 m Mercator telescope for 111 dwarfs, whose Kepler light curves allowed for the determination of their near-core rotation rates. Our spectroscopic information offers additional observational input to also model the envelope layers of these non-radially pulsating dwarfs.
Results. We determined stellar parameters and surface abundances from atmospheric analysis with spectrum normalisation based on a new machine-learning tool. Our results suggest a systematic overestimation of metallicity ([M/H]) in the literature for the studied F-type dwarfs, presumably due to normalisation limitations caused by the dense line spectrum of these rotating stars. CNO surface abundances were found to be uncorrelated with the rotation properties of the F-type stars. For the B-type stars, we find a hint of deep mixing from C and O abundance ratios; N abundance uncertainties are too great to reveal a correlation of N with the rotation of the stars.
Conclusions. Our spectroscopic stellar parameters and abundance determinations allow for the future joint spectroscopic, astrometric (Gaia), and asteroseismic modelling of this legacy sample of gravity-mode pulsators, with the aim of improving our understanding of transport processes in the core-hydrogen burning phase of stellar evolution.
Idiopathische ventrale Rückenmarksherniation
Authors: Beck Jürgen , Klingler Jan-Helge , Shah Mukesch Johannes , Hubbe Ulrich , Jesse Christopher Marvin , Ulrich Christian , Raabe Andreas 
Published: April 2021

ZusammenfassungBei der idiopathischen ventralen Rückenmarksherniation handelt es sich um einen sehr seltenen Defekt der thorakalen ventralen Dura, am häufigsten zwischen BWK 2 und BWK 8, mit konsekutivem Prolaps des Myelons in diesen Duradefekt hinein. Klinisch führt dies oft nach jahrelanger Anamnese zu einer progredienten, mehr oder weniger stark ausgeprägten Myelopathie, z. B. einem Brown-Séquard Syndrom oder einer Paraparese. Die Ursache des Duradefekts und der Mechanismus der Herniation sind nicht geklärt. Diskutiert werden Bandscheibenpathologien wie verkalkte Mikrosporne, Trauma, Entzündung, eine Bindegewebsschwäche und angeborene Dura-Duplikaturen. Die wichtigsten Differentialdiagnosen sind arachnoidale Zysten und arachnoidale Netze (arachnoidal web), die das Myelon bei jedoch intakter Dura nach ventral verlagern, Tumore sowie ischämische und traumatische Myelomalazien. Trotz exzellenter Bildgebung gelingt manchmal die sichere Diagnose einer Myelonhernie samt Duradefekt letztendlich erst intraoperativ. Die operative Versorgung ist, einschließlich auch der nur leicht symptomatischen Patienten, die Therapie der Wahl und stellt eine neurochirurgische Herausforderung dar. Ziel ist das Lösen des Rückenmarks mit, je nach Größe und Lage, entweder Verschluss, Augmentation oder Erweiterung des Duradefekts. Das Risiko für postoperative Defizite beträgt 5–12%. Von einem Behandlungserfolg wird meist bei einem Stopp der klinischen Progression ausgegangen, wobei bis zu 3/4 der Patienten eine Chance auf postoperative Besserung haben. Die operative Behandlung sollte mit intraoperativem Neuromonitoring (SSEP, MEP, D-Welle) in Zentren mit entsprechender Erfahrung erfolgen. Patienten, bei denen noch keine Operationsindikation gestellt wurde, sollten engmaschig angebunden werden, da der natürliche Krankheitsverlauf der idiopathischen ventralen Rückenmarksherniation meist progredient ist.
Der allumfassende Schmerz und was daraus folgt
Authors: Kloke Marianne 
Published: April 2021

ZUSAMMENFASSUNGEin im Rahmen einer rasch fortschreitenden und zum Tode führenden Erkrankung auftretendes komplexes Symptomgeschehen indiziert eine spezialisierte Palliativversorgung. Ihre Philosophie basiert auf einer ganzheitlichen Sicht der Menschen und seiner Familie. So kann das multiprofessionelle Team die physische, psychische, soziale und spirituelle Ebene des Leidens gezielt adressieren und für den Patienten ein umfassendes Behandlungs- und Begleitungskonzept erstellen. Wird das bio-psycho-soziale-spirituelle Konzept dessen, was Leiden ausmacht, missachtet, besteht die Gefahr unwirksamer und u. U. sogar gefährlicher Behandlungen. Wie aufwändig und langwierig der Weg zu einer den Bedürfnissen des Patienten entsprechenden Versorgung sein kann und wie viel Empathie und Geduld er seitens der Behandler erfordert, wird an Hand einer Kasuistik einer 57-jährigen Patientin mit einem rasch progredienten Zervixkarzinom dargestellt.
Diabetes und nicht-alkoholische Fettleber-Erkrankungen
Authors: Birkenfeld Andreas , Stefan Norbert , Roden Michael 
Published: April 2021

ZUSAMMENFASSUNGAdipositas und Typ-2-Diabetes (T2D) erhöhen das Risiko für nicht-alkoholische Fettleber-Erkrankungen (non-alcoholic fatty liver disease, NAFLD) und andere Komorbiditäten. In Deutschland leiden etwa 18 Mio. Menschen an NAFLD, davon haben etwa 3,3 Mio. eine nicht-alkoholische Steatohepatitis (NASH). Zu viel Fett in der Leber hat aber auch einen negativen Einfluss auf den Glukosestoffwechsel und kann zur Entwicklung eines T2D beitragen. Um den Zusammenhang zwischen NAFLD und T2D zielgerichtet zu untersuchen, hat das Deutsche Zentrum für Diabetesforschung (DZD) einen Forschungsschwerpunkt ("Akademie") zu Diabetes und NAFLD aufgebaut. Interdisziplinäre Teams suchen nach Biomarkern zur Verbesserung der Diagnose und Risikostratifizierung sowie nach Mechanismen, die zur Pathogenese und Progression der NAFLD und ihrer Komorbiditäten beitragen. Zudem werden neue Strategien entwickelt, um die NAFLD zu verhindern bzw. besser behandeln zu können. Dabei arbeiten die Forschenden sowohl an medikamentösen Ansätzen als auch an Ernährungsumstellungen.
Veränderungsmessung mit der Kurzform des OPD-Strukturfragebogens (OPD-SFK)
Authors: Lübke Laura , Flemming Eva , Mestel Robert , Masuhr Oliver , Jaeger Ulrich , Spitzer Carsten 
Published: April 2021

AbstractDas transdiagnostische Konzept der Ich- bzw. Persönlichkeitsstruktur spielt in der psychodynamischen Krankheitslehre eine zentrale Rolle, gelten doch viele psychische und psychoso-matische Störungen als Ausdruck struktureller Vulnerabilitäten und Defizite. Daher kommt der Strukturdiagnostik eine besondere Bedeutung zu, gerade unter differenzialindikatorischen und behandlungstechnischen Aspekten. Weil Veränderungen der Persönlichkeitsstruktur auch als Therapieziel immer mehr Beachtung finden, sollten strukturdiagnostische Verfahren änderungssensitiv sein, um diese angemessen zu erfassen. Die Kurzform des OPD-Strukturfragebogens (OPD-SFK) wird zwar aufgrund ihrer Anwendungsökonomie klinisch und wissenschaftlich vielfach eingesetzt, ist bisher jedoch nicht auf ihre Eignung zur Veränderungsmessung analysiert worden. Zwei große, unabhängige und diagnostisch heterogene Stichproben stationärer Psychotherapiepatienten (N=1183 bzw. 967) wurden bei Aufnahme und Entlassung mit dem OPD-SFK untersucht. Als Indikatoren der Änderungssensitivität wurden die Standardized Effect Size (SES), der Standardized Response Mean (SRM) sowie die Smallest Real Difference (SRD) berechnet. Für den OPD-SFK Gesamtwert sowie die Subskalen wurden in beiden Stichproben Veränderungseffekte in niedriger Größenordnung gefunden (SES zwischen 0,23 und 0,48 sowie SRM zwischen 0,27 und 0,53). Zudem wurde gezeigt, dass mit dem OPD-SFK größere Veränderungen für Patienten mit strukturellen Störungen nachweisbar sind als für jene mit geringen Strukturdefiziten und dass die Gruppenunterschiede signifikant sind. Mittels der SRD wurde in beiden Stichproben ein Anteil von 22% signifikant strukturell verbesserter Patienten ermittelt. Trotz einiger methodenkritischer Aspekte legen die Befunde nahe, dass sich der OPD-SFK bei stationären Psychotherapiepatienten eignet, um Veränderungen persönlichkeitsstruktureller Fähigkeiten zwischen Beginn und Abschluss der Behandlung abzubilden. Da Untersuchungen zur Änderungssensitivität anderer strukturdiagnostischer Verfahren ausstehen, können bislang keine empirisch abgesicherten Empfehlungen formuliert werden, welches Instrument am besten therapeutisch induzierte Veränderungen in der Persönlichkeitsstruktur erfasst.
Neurofibromatosis Type 2: A Pandora’s Box of Variable Presentations
Authors: Gandhi Ashok , Gandhi Swarup Sohan , Jain Surendra , Jain Shashikant , Sukhani Paresh 
Published: April 2021

Abstract
Introduction Neurofibromatosis type 2 (NF2) also known as MISME syndrome stands for multiple inherited schwannomas, meningiomas, and ependymomas in the peripheral and central nervous system. It is a rare disorder of autosomal dominant inheritance due to mutations of a tumor-suppressor gene on the chromosome 22q12. Clinically, it is characterized by multiple benign tumors arising in both the central and peripheral nervous system, particularly from the bilateral vestibular nerve, in more than 90% of the patients, with more than two thirds of them developing spinal tumors.
Materials and Methods Here, we studied the variable presentations of cases of NF2, and thorough evaluation of patients was done by contrast MRI of brain and spine. Also, evaluation of ocular manifestations and cutaneous features was done in cases of NF2, and a follow-up was done for a period of 18 months with monitoring of cranial and spinal lesions.
Conclusion We studied the various presentations of NF2 and found that a significant proportion of the patients presented with nonvestibular tumors as the initial presentation, with bilateral cerebellopontine angle lesions being an incidental finding; also, the age of presentation in half of the patients was less than 30 years, and so we can conclude that in young patients with spinal tumors or multiple meningiomas, a thorough evaluation regarding family history and various features of NF2 should be done, so that early identification of the disease could be done and patients can be benefitted from timely interventions.
Radioembolization in the Office-Based Lab
Authors: St Amour Edgar D. 
Published: April 2021

AbstractInterventional procedures have been performed on an outpatient basis in the hospital setting for many years, although there has been a clear trend toward performing these procedures in an outpatient facility, such as an ambulatory surgery center or office-based lab. And while this trend initially began with dialysis interventions and then endovascular interventions, interventional oncology is starting to catch on. Radioembolization has routinely been performed in an outpatient setting, and has recently gained traction in office-based labs due to new reimbursement codes, which became available in 2017. This article will outline the safety and feasibility, including economic considerations and demonstrated growth, of performing radioembolization in an office-based lab.
Nature-inspired orbital angular momentum beam generator using aperiodic metasurface
Authors: Taher Al-Nuaimi Mustafa K , Hong Wei , Whittow William G 
Published: April 2021

Abstract
This article presents the design of reflective nature-inspired metasurfaces for generation of wideband and high purity circularly polarized (CP) orbital angular momentum (OAM) waves. It has been shown in this article that the breaking of the transitional periodicity and the combination of aperiodic nature-inspired distribution of sub-wavelength sized meta-atoms based on Pancharatnam–Berry (PB) phase theory can lead to OAM beams of high purity with improved bandwidth. The distribution of the PB anisotropic meta-atoms across the proposed metasurface aperture is non-uniform and distributed along logarithmic spirals similar to sunflower seeds, i.e. outwardly logarithmic spiral lattices of no transitional periodicity. The proposed reflective CP-OAM beam generator metasurface diameter is 140 mm, thickness ≈ 0.11λ
17GHz and has 600 anisotropic spatially rotated PB meta-atoms of sub-wavelength size of 5 mm ≈ 0.28λ
17GHz. Four OAM metasurface generators have been designed to produce OAM waves of various modes from 1 to 4. Both simulation and experimental results have demonstrated that the proposed metasurfaces can efficiently generate CP-OAM beams from 13.1 GHz to 20.5 GHz (BW = 44%) with high mode purity >90%.
Dual-active-layer InGaZnO high-voltage thin-film transistors
Authors: Huo Wenxing , Liang Huili , Lu Yicheng , Han Zuyin , Zhu Rui , Sui Yanxin , Wang Tao , Mei Zengxia 
Published: April 2021

Abstract
InGaZnO high-voltage thin-film transistors (HV-TFTs) with vertical dual-active-layer structure and lateral offset design were fabricated at low temperature. The TFT features such as sub-threshold swing, threshold voltage, and hysteresis voltage are similar to those of the normal devices; furthermore, they are independent of the offset length. The blocking voltage of HV-TFTs with an offset of 10 μm is 406 ± 17 V while the ON/OFF ratio reaches 109 at

V

DS

=
10

V

.
Investigating well potential parameters on neural spike enhancement in a stochastic-resonance pre-emphasis algorithm
Authors: Güngör Cihan Berk , Mercier Patrick P , Töreyin Hakan 
Published: April 2021

Abstract

Objective. Background noise experienced during extracellular neural recording limits the number of spikes that can be reliably detected, which ultimately limits the performance of next-generation neuroscientific work. In this study, we aim to utilize stochastic resonance (SR), a technique that can help identify weak signals in noisy environments, to enhance spike detectability. Approach. Previously, an SR-based pre-emphasis algorithm was proposed, where a particle inside a 1D potential well is exerted by a force defined by the extracellular recording, and the output is obtained as the displacement of the particle. In this study, we investigate how the well shape and damping status impact the output signal-to-noise ratio (SNR). We compare the overdamped and underdamped solutions of shallow- and steep-wall monostable wells and bistable wells in terms of SNR improvement using two synthetic datasets. Then, we assess the spike detection performance when thresholding is applied on the output of the well shape-damping status configuration giving the best SNR enhancement. Main results. The SNR depends on the well-shape and damping-status type as well as the input noise level. The underdamped solution of the shallow-wall monostable well can yield to more than four orders of magnitude greater SNR improvement compared to other configurations for low noise intensities. Using this configuration also results in better spike detection sensitivity and positive predictivity than the state-of-the-art spike detection algorithms for a public synthetic dataset. For larger noise intensities, the overdamped solution of the steep-wall monostable well provides better spike enhancement than the others. Significance. The dependence of SNR improvement on the input signal noise level can be used to design a detector with multiple outputs, each more sensitive to a certain distance from the electrode. Such a detector can potentially enhance the performance of a successive spike sorting stage.
Effects of solution concentration on the structural and optical properties of CuAlO2 thin films prepared on 4H-SiC via sol-gel method
Authors: Hu Jichao , Liu Xianhe , He Xiaomin , Wang Xi , Yang Guowen 
Published: April 2021

Abstract
In this work, the effects of solution concentration on the crystal structure, optical properties and surface morphology of the CuAlO2 thin films prepared on 4H-SiC (0001) by sol-gel method were studied. X-ray diffraction (XRD) indicates that the CuAlO2 films are polycrystalline and have a high preferential growth orientation (012). In addition, four emission peaks were observed from room temperature photoluminescence (PL) spectra. The emission peaks at 360 nm (3.45 eV) and 380 nm (3.26eV) are near band edge emission of CuAlO2 film and 4H-SiC substrate, respectively. The other two emission peaks at 410 nm (3.02 eV) and 470 nm (2.64 eV) arises from Cu-vacancy defect. The surface roughness of the films was increased in the case of high solution concentrations, resulting a reduction in the optical transmittance. However, an overall improvement in crystallinity of the films and reduction of Cu-vacancy defect was observed with the increased solution concentrations.
Experimental study on freeze-thaw resistance of modified magnesium oxychloride cement foam concrete
Authors: Zhong Dongqing , Wang Shuguang , Gao Yu , Wang Luming , Feng Koubao 
Published: April 2021

Abstract
Magnesium oxychloride cement foam concrete specimenswere prepared by applying the inorganic-organic composite modification method to improve the water resistance of magnesium oxychloride cement and using the composite protein foaming agent for the purpose of foaming. Then, freeze-thaw cycle test was performed to examinethe frost resistance property of the specimens under the designed mix proportion. The experimental results show that: after 20 freeze-thaw cycles, neither macro-cracks nor hollow spalling are observed on the surface of the specimen, the strength loss rate is only 12%, and the compressive strength remains at a relatively high level of 1.46 MPa. Meanwhile, the microstructure of the specimen before and after the freeze-thaw experiment was analyzed through SEM test, and the failure mechanism during the freeze-thaw process was explained.
Acid-assisted synthesis of TiO2 nanoparticles for enhancement of visible light photocatalytic efficiency
Authors: Gu Yi-Jie , Zhou Ming , Dong Zhihua , Cheng Zhiqun , Deng Tian-Song 
Published: April 2021

Abstract
Compared with pure phase TiO2, the mixed-phase TiO2 nanoparticles with oxygen vacancies can help to reduce the carrier recombination rate and band gap, which is contribute to the visible light photocatalysis performance. In this study, three kinds of acid were separately used to prepare TiO2 nanoparticles by hydrothermal method without any post-heat treatment for enhancement of visible light photocatalytic efficiency. When utilized to assist photocatalysis degradation of methyl orange in water under visible light irradiation, the TiO2 nanoparticles obtained from HCl (H-TiO2) and CH3COOH (A-TiO2) showed stable photocatalysis performance for increasing the cycles up to ten times while only five cycles for TiO2 nanoparticles obtained by HNO3-assisted (N-TiO2). The photocatalysis performance of H-TiO2 powder and A-TiO2 powder are both better than that of the N-TiO2 powder. Therefore, the TiO2 samples prepared by HCl- and CH3COOH-assisted method in this work are regarded as excellent photocatalysts for water cleaning.
Study on interface of Sn-Ag-Zn lead free solder with low silver content
Authors: Xiao Jin , Zhou Yanqiong , Li Wuchu 
Published: April 2021

Abstract
The interface reaction between Sn-1Ag-1Zn low silver alloy solder and different substrates was studied. After aging at 200 ℃, a double-layer IMC structure is formed at the interface. Cu5Zn8 and Ag3Sn are formed from Cu substrate to solder in turn. The morphology of interface Cu5Zn8 has no change with aging. After aging for 100 h, the thickness of Ag3Sn is only about 4 μ m, and the IMC of bilayer structure blocks and suppresses each other. After Sn-1Ag-1Zn solder is welded to Cu substrate with Ni barrier layer, Ni3Sn4 layer is formed on the surface, and its thickness increases slowly with aging time at 200 ℃. After aging for 1000 h, the thickness of Ni3Sn4 layer is only about 1 μ m, and the morphology is smooth. There is no aggregation of other alloying elements near the interface and IMC which destroys the reliability of the interface is formed. The Ni barrier layer has a good barrier effect.
Research and Simulation of Three-phase Vienna Rectifier Based on Feedforward Decoupling Control
Authors: Liu Yanbin , Jia Qiang , Zhang Feng , Zhang Xiaohan , Zhang Junzhe 
Published: April 2021

Abstract
This paper takes the three-phase VIENNA rectifier as the research object. Aiming at the problem that its dq-coordinate system model has strong coupling and nonlinear characteristics, which makes the design of the controller system more difficult, a control strategy based on feedforward decoupling control is proposed. First, this paper analyzes the working principle and mathematical model of the rectifier, then introduce the newly proposed control system and controller parameter design, and finally build a simulation model with PESIC software. The simulation results verify the correctness and rationality of the proposed feedforward decoupling control. The proposed control strategy can further reduce the harmonic content of AC side of the rectifier, improve the steady-state performance, and have better dynamic performance when the load power changes.
Prediction Model of Microstructure and Properties of Al Foil Alloy During Thermal Deformation
Authors: Yan Wenduan , Li Yan , Xu Yanhua , Lai Wanqing , Zhou Xiumin 
Published: April 2021

Abstract
Prediction model of microstructure and properties of Al foil alloy was established by thermo-simulation compression experiment. The relationships between grain size, material constants, and flow stress were studied. In thermal deformed Al foil alloy, the relationship between grain size and material parameter Z met an approximately linear relationship, and an unitary linear regression equation was established. The influence of grain size on flow stress during thermal deformation was highly significant. The prediction models could thus predict the structure of the alloy during thermal deformation effectively, and guide the Al foil rolling.
The influence of copper content on the braking performance of iron-based powder metallurgy friction materials
Authors: Lan Hai , Hui Yang , Han Ming , Liu Guimin , Du Jianhua 
Published: April 2021

Abstract
Three iron-based powder metallurgy friction materials with different Cu content were prepared by powder metallurgy. The friction and wear properties of the materials were evaluated by the MM3000 friction and wear tester, and the effect of Cu content on the friction coefficient, wear rate and surface morphology was studied. The results show that with the increase of copper content, the matrix components are alloyed at high temperature, and the hardness and strength are significantly improved. The coefficient of dynamic friction and wear rate decreased significantly, and the coefficient of static friction and friction stability increased at high temperature. When the copper content is low, abrasive wear, spalling wear and fatigue wear are the main causes, while when the copper content is high, only slight abrasive wear occurs.